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authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-23 17:08:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-23 17:08:40 -0700
commitc80ddb526331a72c9e9d1480f85f6fd7c74e3d2d (patch)
tree0212803a009f171990032abb94fad84156baa153 /drivers/md
parent2c13bc0f8f0d3e13b42be70bf74fec8e56b58324 (diff)
parent1dff2b87a34a1ac1d1898ea109bf97ed396aca53 (diff)
downloadop-kernel-dev-c80ddb526331a72c9e9d1480f85f6fd7c74e3d2d.zip
op-kernel-dev-c80ddb526331a72c9e9d1480f85f6fd7c74e3d2d.tar.gz
Merge tag 'md-3.5' of git://neil.brown.name/md
Pull md updates from NeilBrown: "It's been a busy cycle for md - lots of fun stuff here.. if you like this kind of thing :-) Main features: - RAID10 arrays can be reshaped - adding and removing devices and changing chunks (not 'far' array though) - allow RAID5 arrays to be reshaped with a backup file (not tested yet, but the priciple works fine for RAID10). - arrays can be reshaped while a bitmap is present - you no longer need to remove it first - SSSE3 support for RAID6 syndrome calculations and of course a number of minor fixes etc." * tag 'md-3.5' of git://neil.brown.name/md: (56 commits) md/bitmap: record the space available for the bitmap in the superblock. md/raid10: Remove extras after reshape to smaller number of devices. md/raid5: improve removal of extra devices after reshape. md: check the return of mddev_find() MD RAID1: Further conditionalize 'fullsync' DM RAID: Use md_error() in place of simply setting Faulty bit DM RAID: Record and handle missing devices DM RAID: Set recovery flags on resume md/raid5: Allow reshape while a bitmap is present. md/raid10: resize bitmap when required during reshape. md: allow array to be resized while bitmap is present. md/bitmap: make sure reshape request are reflected in superblock. md/bitmap: add bitmap_resize function to allow bitmap resizing. md/bitmap: use DIV_ROUND_UP instead of open-code md/bitmap: create a 'struct bitmap_counts' substructure of 'struct bitmap' md/bitmap: make bitmap bitops atomic. md/bitmap: make _page_attr bitops atomic. md/bitmap: merge bitmap_file_unmap and bitmap_file_put. md/bitmap: remove async freeing of bitmap file. md/bitmap: convert some spin_lock_irqsave to spin_lock_irq ...
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bitmap.c1100
-rw-r--r--drivers/md/bitmap.h60
-rw-r--r--drivers/md/dm-raid.c22
-rw-r--r--drivers/md/md.c370
-rw-r--r--drivers/md/md.h12
-rw-r--r--drivers/md/raid1.c22
-rw-r--r--drivers/md/raid10.c1281
-rw-r--r--drivers/md/raid10.h34
-rw-r--r--drivers/md/raid5.c252
-rw-r--r--drivers/md/raid5.h7
10 files changed, 2365 insertions, 795 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 17e2b47..15dbe03 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -45,7 +45,7 @@ static inline char *bmname(struct bitmap *bitmap)
* if we find our page, we increment the page's refcount so that it stays
* allocated while we're using it
*/
-static int bitmap_checkpage(struct bitmap *bitmap,
+static int bitmap_checkpage(struct bitmap_counts *bitmap,
unsigned long page, int create)
__releases(bitmap->lock)
__acquires(bitmap->lock)
@@ -76,8 +76,7 @@ __acquires(bitmap->lock)
spin_lock_irq(&bitmap->lock);
if (mappage == NULL) {
- pr_debug("%s: bitmap map page allocation failed, hijacking\n",
- bmname(bitmap));
+ pr_debug("md/bitmap: map page allocation failed, hijacking\n");
/* failed - set the hijacked flag so that we can use the
* pointer as a counter */
if (!bitmap->bp[page].map)
@@ -100,7 +99,7 @@ __acquires(bitmap->lock)
/* if page is completely empty, put it back on the free list, or dealloc it */
/* if page was hijacked, unmark the flag so it might get alloced next time */
/* Note: lock should be held when calling this */
-static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page)
+static void bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page)
{
char *ptr;
@@ -130,22 +129,14 @@ static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page)
*/
/* IO operations when bitmap is stored near all superblocks */
-static struct page *read_sb_page(struct mddev *mddev, loff_t offset,
- struct page *page,
- unsigned long index, int size)
+static int read_sb_page(struct mddev *mddev, loff_t offset,
+ struct page *page,
+ unsigned long index, int size)
{
/* choose a good rdev and read the page from there */
struct md_rdev *rdev;
sector_t target;
- int did_alloc = 0;
-
- if (!page) {
- page = alloc_page(GFP_KERNEL);
- if (!page)
- return ERR_PTR(-ENOMEM);
- did_alloc = 1;
- }
rdev_for_each(rdev, mddev) {
if (! test_bit(In_sync, &rdev->flags)
@@ -158,15 +149,10 @@ static struct page *read_sb_page(struct mddev *mddev, loff_t offset,
roundup(size, bdev_logical_block_size(rdev->bdev)),
page, READ, true)) {
page->index = index;
- attach_page_buffers(page, NULL); /* so that free_buffer will
- * quietly no-op */
- return page;
+ return 0;
}
}
- if (did_alloc)
- put_page(page);
- return ERR_PTR(-EIO);
-
+ return -EIO;
}
static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev)
@@ -208,6 +194,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
struct md_rdev *rdev = NULL;
struct block_device *bdev;
struct mddev *mddev = bitmap->mddev;
+ struct bitmap_storage *store = &bitmap->storage;
while ((rdev = next_active_rdev(rdev, mddev)) != NULL) {
int size = PAGE_SIZE;
@@ -215,9 +202,13 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev;
- if (page->index == bitmap->file_pages-1)
- size = roundup(bitmap->last_page_size,
+ if (page->index == store->file_pages-1) {
+ int last_page_size = store->bytes & (PAGE_SIZE-1);
+ if (last_page_size == 0)
+ last_page_size = PAGE_SIZE;
+ size = roundup(last_page_size,
bdev_logical_block_size(bdev));
+ }
/* Just make sure we aren't corrupting data or
* metadata
*/
@@ -276,10 +267,10 @@ static void write_page(struct bitmap *bitmap, struct page *page, int wait)
{
struct buffer_head *bh;
- if (bitmap->file == NULL) {
+ if (bitmap->storage.file == NULL) {
switch (write_sb_page(bitmap, page, wait)) {
case -EINVAL:
- bitmap->flags |= BITMAP_WRITE_ERROR;
+ set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
}
} else {
@@ -297,20 +288,16 @@ static void write_page(struct bitmap *bitmap, struct page *page, int wait)
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
}
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
bitmap_file_kick(bitmap);
}
static void end_bitmap_write(struct buffer_head *bh, int uptodate)
{
struct bitmap *bitmap = bh->b_private;
- unsigned long flags;
- if (!uptodate) {
- spin_lock_irqsave(&bitmap->lock, flags);
- bitmap->flags |= BITMAP_WRITE_ERROR;
- spin_unlock_irqrestore(&bitmap->lock, flags);
- }
+ if (!uptodate)
+ set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
if (atomic_dec_and_test(&bitmap->pending_writes))
wake_up(&bitmap->write_wait);
}
@@ -325,8 +312,12 @@ __clear_page_buffers(struct page *page)
}
static void free_buffers(struct page *page)
{
- struct buffer_head *bh = page_buffers(page);
+ struct buffer_head *bh;
+ if (!PagePrivate(page))
+ return;
+
+ bh = page_buffers(page);
while (bh) {
struct buffer_head *next = bh->b_this_page;
free_buffer_head(bh);
@@ -343,11 +334,12 @@ static void free_buffers(struct page *page)
* This usage is similar to how swap files are handled, and allows us
* to write to a file with no concerns of memory allocation failing.
*/
-static struct page *read_page(struct file *file, unsigned long index,
- struct bitmap *bitmap,
- unsigned long count)
+static int read_page(struct file *file, unsigned long index,
+ struct bitmap *bitmap,
+ unsigned long count,
+ struct page *page)
{
- struct page *page = NULL;
+ int ret = 0;
struct inode *inode = file->f_path.dentry->d_inode;
struct buffer_head *bh;
sector_t block;
@@ -355,16 +347,9 @@ static struct page *read_page(struct file *file, unsigned long index,
pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE,
(unsigned long long)index << PAGE_SHIFT);
- page = alloc_page(GFP_KERNEL);
- if (!page)
- page = ERR_PTR(-ENOMEM);
- if (IS_ERR(page))
- goto out;
-
bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0);
if (!bh) {
- put_page(page);
- page = ERR_PTR(-ENOMEM);
+ ret = -ENOMEM;
goto out;
}
attach_page_buffers(page, bh);
@@ -376,8 +361,7 @@ static struct page *read_page(struct file *file, unsigned long index,
bh->b_blocknr = bmap(inode, block);
if (bh->b_blocknr == 0) {
/* Cannot use this file! */
- free_buffers(page);
- page = ERR_PTR(-EINVAL);
+ ret = -EINVAL;
goto out;
}
bh->b_bdev = inode->i_sb->s_bdev;
@@ -400,17 +384,15 @@ static struct page *read_page(struct file *file, unsigned long index,
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
- if (bitmap->flags & BITMAP_WRITE_ERROR) {
- free_buffers(page);
- page = ERR_PTR(-EIO);
- }
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
+ ret = -EIO;
out:
- if (IS_ERR(page))
- printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %ld\n",
+ if (ret)
+ printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %d\n",
(int)PAGE_SIZE,
(unsigned long long)index << PAGE_SHIFT,
- PTR_ERR(page));
- return page;
+ ret);
+ return ret;
}
/*
@@ -426,9 +408,9 @@ void bitmap_update_sb(struct bitmap *bitmap)
return;
if (bitmap->mddev->bitmap_info.external)
return;
- if (!bitmap->sb_page) /* no superblock */
+ if (!bitmap->storage.sb_page) /* no superblock */
return;
- sb = kmap_atomic(bitmap->sb_page);
+ sb = kmap_atomic(bitmap->storage.sb_page);
sb->events = cpu_to_le64(bitmap->mddev->events);
if (bitmap->mddev->events < bitmap->events_cleared)
/* rocking back to read-only */
@@ -438,8 +420,13 @@ void bitmap_update_sb(struct bitmap *bitmap)
/* Just in case these have been changed via sysfs: */
sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
+ /* This might have been changed by a reshape */
+ sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
+ sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
+ sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
+ bitmap_info.space);
kunmap_atomic(sb);
- write_page(bitmap, bitmap->sb_page, 1);
+ write_page(bitmap, bitmap->storage.sb_page, 1);
}
/* print out the bitmap file superblock */
@@ -447,9 +434,9 @@ void bitmap_print_sb(struct bitmap *bitmap)
{
bitmap_super_t *sb;
- if (!bitmap || !bitmap->sb_page)
+ if (!bitmap || !bitmap->storage.sb_page)
return;
- sb = kmap_atomic(bitmap->sb_page);
+ sb = kmap_atomic(bitmap->storage.sb_page);
printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap));
printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic));
printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version));
@@ -488,15 +475,15 @@ static int bitmap_new_disk_sb(struct bitmap *bitmap)
unsigned long chunksize, daemon_sleep, write_behind;
int err = -EINVAL;
- bitmap->sb_page = alloc_page(GFP_KERNEL);
- if (IS_ERR(bitmap->sb_page)) {
- err = PTR_ERR(bitmap->sb_page);
- bitmap->sb_page = NULL;
+ bitmap->storage.sb_page = alloc_page(GFP_KERNEL);
+ if (IS_ERR(bitmap->storage.sb_page)) {
+ err = PTR_ERR(bitmap->storage.sb_page);
+ bitmap->storage.sb_page = NULL;
return err;
}
- bitmap->sb_page->index = 0;
+ bitmap->storage.sb_page->index = 0;
- sb = kmap_atomic(bitmap->sb_page);
+ sb = kmap_atomic(bitmap->storage.sb_page);
sb->magic = cpu_to_le32(BITMAP_MAGIC);
sb->version = cpu_to_le32(BITMAP_MAJOR_HI);
@@ -534,8 +521,8 @@ static int bitmap_new_disk_sb(struct bitmap *bitmap)
memcpy(sb->uuid, bitmap->mddev->uuid, 16);
- bitmap->flags |= BITMAP_STALE;
- sb->state |= cpu_to_le32(BITMAP_STALE);
+ set_bit(BITMAP_STALE, &bitmap->flags);
+ sb->state = cpu_to_le32(bitmap->flags);
bitmap->events_cleared = bitmap->mddev->events;
sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
@@ -551,31 +538,45 @@ static int bitmap_read_sb(struct bitmap *bitmap)
bitmap_super_t *sb;
unsigned long chunksize, daemon_sleep, write_behind;
unsigned long long events;
+ unsigned long sectors_reserved = 0;
int err = -EINVAL;
+ struct page *sb_page;
+ if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {
+ chunksize = 128 * 1024 * 1024;
+ daemon_sleep = 5 * HZ;
+ write_behind = 0;
+ set_bit(BITMAP_STALE, &bitmap->flags);
+ err = 0;
+ goto out_no_sb;
+ }
/* page 0 is the superblock, read it... */
- if (bitmap->file) {
- loff_t isize = i_size_read(bitmap->file->f_mapping->host);
+ sb_page = alloc_page(GFP_KERNEL);
+ if (!sb_page)
+ return -ENOMEM;
+ bitmap->storage.sb_page = sb_page;
+
+ if (bitmap->storage.file) {
+ loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host);
int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
- bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes);
+ err = read_page(bitmap->storage.file, 0,
+ bitmap, bytes, sb_page);
} else {
- bitmap->sb_page = read_sb_page(bitmap->mddev,
- bitmap->mddev->bitmap_info.offset,
- NULL,
- 0, sizeof(bitmap_super_t));
+ err = read_sb_page(bitmap->mddev,
+ bitmap->mddev->bitmap_info.offset,
+ sb_page,
+ 0, sizeof(bitmap_super_t));
}
- if (IS_ERR(bitmap->sb_page)) {
- err = PTR_ERR(bitmap->sb_page);
- bitmap->sb_page = NULL;
+ if (err)
return err;
- }
- sb = kmap_atomic(bitmap->sb_page);
+ sb = kmap_atomic(sb_page);
chunksize = le32_to_cpu(sb->chunksize);
daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
write_behind = le32_to_cpu(sb->write_behind);
+ sectors_reserved = le32_to_cpu(sb->sectors_reserved);
/* verify that the bitmap-specific fields are valid */
if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
@@ -618,60 +619,32 @@ static int bitmap_read_sb(struct bitmap *bitmap)
"-- forcing full recovery\n",
bmname(bitmap), events,
(unsigned long long) bitmap->mddev->events);
- sb->state |= cpu_to_le32(BITMAP_STALE);
+ set_bit(BITMAP_STALE, &bitmap->flags);
}
}
/* assign fields using values from superblock */
- bitmap->mddev->bitmap_info.chunksize = chunksize;
- bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
- bitmap->mddev->bitmap_info.max_write_behind = write_behind;
bitmap->flags |= le32_to_cpu(sb->state);
if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
- bitmap->flags |= BITMAP_HOSTENDIAN;
+ set_bit(BITMAP_HOSTENDIAN, &bitmap->flags);
bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
- if (bitmap->flags & BITMAP_STALE)
- bitmap->events_cleared = bitmap->mddev->events;
err = 0;
out:
kunmap_atomic(sb);
+out_no_sb:
+ if (test_bit(BITMAP_STALE, &bitmap->flags))
+ bitmap->events_cleared = bitmap->mddev->events;
+ bitmap->mddev->bitmap_info.chunksize = chunksize;
+ bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
+ bitmap->mddev->bitmap_info.max_write_behind = write_behind;
+ if (bitmap->mddev->bitmap_info.space == 0 ||
+ bitmap->mddev->bitmap_info.space > sectors_reserved)
+ bitmap->mddev->bitmap_info.space = sectors_reserved;
if (err)
bitmap_print_sb(bitmap);
return err;
}
-enum bitmap_mask_op {
- MASK_SET,
- MASK_UNSET
-};
-
-/* record the state of the bitmap in the superblock. Return the old value */
-static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
- enum bitmap_mask_op op)
-{
- bitmap_super_t *sb;
- int old;
-
- if (!bitmap->sb_page) /* can't set the state */
- return 0;
- sb = kmap_atomic(bitmap->sb_page);
- old = le32_to_cpu(sb->state) & bits;
- switch (op) {
- case MASK_SET:
- sb->state |= cpu_to_le32(bits);
- bitmap->flags |= bits;
- break;
- case MASK_UNSET:
- sb->state &= cpu_to_le32(~bits);
- bitmap->flags &= ~bits;
- break;
- default:
- BUG();
- }
- kunmap_atomic(sb);
- return old;
-}
-
/*
* general bitmap file operations
*/
@@ -683,17 +656,19 @@ static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
* file a page at a time. There's a superblock at the start of the file.
*/
/* calculate the index of the page that contains this bit */
-static inline unsigned long file_page_index(struct bitmap *bitmap, unsigned long chunk)
+static inline unsigned long file_page_index(struct bitmap_storage *store,
+ unsigned long chunk)
{
- if (!bitmap->mddev->bitmap_info.external)
+ if (store->sb_page)
chunk += sizeof(bitmap_super_t) << 3;
return chunk >> PAGE_BIT_SHIFT;
}
/* calculate the (bit) offset of this bit within a page */
-static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned long chunk)
+static inline unsigned long file_page_offset(struct bitmap_storage *store,
+ unsigned long chunk)
{
- if (!bitmap->mddev->bitmap_info.external)
+ if (store->sb_page)
chunk += sizeof(bitmap_super_t) << 3;
return chunk & (PAGE_BITS - 1);
}
@@ -705,57 +680,86 @@ static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned lon
* 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page
* 0 or page 1
*/
-static inline struct page *filemap_get_page(struct bitmap *bitmap,
+static inline struct page *filemap_get_page(struct bitmap_storage *store,
unsigned long chunk)
{
- if (file_page_index(bitmap, chunk) >= bitmap->file_pages)
+ if (file_page_index(store, chunk) >= store->file_pages)
return NULL;
- return bitmap->filemap[file_page_index(bitmap, chunk)
- - file_page_index(bitmap, 0)];
+ return store->filemap[file_page_index(store, chunk)
+ - file_page_index(store, 0)];
}
-static void bitmap_file_unmap(struct bitmap *bitmap)
+static int bitmap_storage_alloc(struct bitmap_storage *store,
+ unsigned long chunks, int with_super)
+{
+ int pnum;
+ unsigned long num_pages;
+ unsigned long bytes;
+
+ bytes = DIV_ROUND_UP(chunks, 8);
+ if (with_super)
+ bytes += sizeof(bitmap_super_t);
+
+ num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
+
+ store->filemap = kmalloc(sizeof(struct page *)
+ * num_pages, GFP_KERNEL);
+ if (!store->filemap)
+ return -ENOMEM;
+
+ if (with_super && !store->sb_page) {
+ store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO);
+ if (store->sb_page == NULL)
+ return -ENOMEM;
+ store->sb_page->index = 0;
+ }
+ pnum = 0;
+ if (store->sb_page) {
+ store->filemap[0] = store->sb_page;
+ pnum = 1;
+ }
+ for ( ; pnum < num_pages; pnum++) {
+ store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO);
+ if (!store->filemap[pnum]) {
+ store->file_pages = pnum;
+ return -ENOMEM;
+ }
+ store->filemap[pnum]->index = pnum;
+ }
+ store->file_pages = pnum;
+
+ /* We need 4 bits per page, rounded up to a multiple
+ * of sizeof(unsigned long) */
+ store->filemap_attr = kzalloc(
+ roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
+ GFP_KERNEL);
+ if (!store->filemap_attr)
+ return -ENOMEM;
+
+ store->bytes = bytes;
+
+ return 0;
+}
+
+static void bitmap_file_unmap(struct bitmap_storage *store)
{
struct page **map, *sb_page;
- unsigned long *attr;
int pages;
- unsigned long flags;
+ struct file *file;
- spin_lock_irqsave(&bitmap->lock, flags);
- map = bitmap->filemap;
- bitmap->filemap = NULL;
- attr = bitmap->filemap_attr;
- bitmap->filemap_attr = NULL;
- pages = bitmap->file_pages;
- bitmap->file_pages = 0;
- sb_page = bitmap->sb_page;
- bitmap->sb_page = NULL;
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ file = store->file;
+ map = store->filemap;
+ pages = store->file_pages;
+ sb_page = store->sb_page;
while (pages--)
if (map[pages] != sb_page) /* 0 is sb_page, release it below */
free_buffers(map[pages]);
kfree(map);
- kfree(attr);
+ kfree(store->filemap_attr);
if (sb_page)
free_buffers(sb_page);
-}
-
-static void bitmap_file_put(struct bitmap *bitmap)
-{
- struct file *file;
- unsigned long flags;
-
- spin_lock_irqsave(&bitmap->lock, flags);
- file = bitmap->file;
- bitmap->file = NULL;
- spin_unlock_irqrestore(&bitmap->lock, flags);
-
- if (file)
- wait_event(bitmap->write_wait,
- atomic_read(&bitmap->pending_writes)==0);
- bitmap_file_unmap(bitmap);
if (file) {
struct inode *inode = file->f_path.dentry->d_inode;
@@ -773,14 +777,14 @@ static void bitmap_file_kick(struct bitmap *bitmap)
{
char *path, *ptr = NULL;
- if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) {
+ if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
bitmap_update_sb(bitmap);
- if (bitmap->file) {
+ if (bitmap->storage.file) {
path = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (path)
- ptr = d_path(&bitmap->file->f_path, path,
- PAGE_SIZE);
+ ptr = d_path(&bitmap->storage.file->f_path,
+ path, PAGE_SIZE);
printk(KERN_ALERT
"%s: kicking failed bitmap file %s from array!\n",
@@ -792,10 +796,6 @@ static void bitmap_file_kick(struct bitmap *bitmap)
"%s: disabling internal bitmap due to errors\n",
bmname(bitmap));
}
-
- bitmap_file_put(bitmap);
-
- return;
}
enum bitmap_page_attr {
@@ -805,24 +805,30 @@ enum bitmap_page_attr {
BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */
};
-static inline void set_page_attr(struct bitmap *bitmap, struct page *page,
- enum bitmap_page_attr attr)
+static inline void set_page_attr(struct bitmap *bitmap, int pnum,
+ enum bitmap_page_attr attr)
{
- __set_bit((page->index<<2) + attr, bitmap->filemap_attr);
+ set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
}
-static inline void clear_page_attr(struct bitmap *bitmap, struct page *page,
- enum bitmap_page_attr attr)
+static inline void clear_page_attr(struct bitmap *bitmap, int pnum,
+ enum bitmap_page_attr attr)
{
- __clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
+ clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
}
-static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page,
- enum bitmap_page_attr attr)
+static inline int test_page_attr(struct bitmap *bitmap, int pnum,
+ enum bitmap_page_attr attr)
{
- return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
+ return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
}
+static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum,
+ enum bitmap_page_attr attr)
+{
+ return test_and_clear_bit((pnum<<2) + attr,
+ bitmap->storage.filemap_attr);
+}
/*
* bitmap_file_set_bit -- called before performing a write to the md device
* to set (and eventually sync) a particular bit in the bitmap file
@@ -835,26 +841,46 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
unsigned long bit;
struct page *page;
void *kaddr;
- unsigned long chunk = block >> bitmap->chunkshift;
+ unsigned long chunk = block >> bitmap->counts.chunkshift;
- if (!bitmap->filemap)
- return;
-
- page = filemap_get_page(bitmap, chunk);
+ page = filemap_get_page(&bitmap->storage, chunk);
if (!page)
return;
- bit = file_page_offset(bitmap, chunk);
+ bit = file_page_offset(&bitmap->storage, chunk);
/* set the bit */
kaddr = kmap_atomic(page);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
+ if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
set_bit(bit, kaddr);
else
- __set_bit_le(bit, kaddr);
+ test_and_set_bit_le(bit, kaddr);
kunmap_atomic(kaddr);
pr_debug("set file bit %lu page %lu\n", bit, page->index);
/* record page number so it gets flushed to disk when unplug occurs */
- set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
+ set_page_attr(bitmap, page->index, BITMAP_PAGE_DIRTY);
+}
+
+static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
+{
+ unsigned long bit;
+ struct page *page;
+ void *paddr;
+ unsigned long chunk = block >> bitmap->counts.chunkshift;
+
+ page = filemap_get_page(&bitmap->storage, chunk);
+ if (!page)
+ return;
+ bit = file_page_offset(&bitmap->storage, chunk);
+ paddr = kmap_atomic(page);
+ if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
+ clear_bit(bit, paddr);
+ else
+ test_and_clear_bit_le(bit, paddr);
+ kunmap_atomic(paddr);
+ if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) {
+ set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING);
+ bitmap->allclean = 0;
+ }
}
/* this gets called when the md device is ready to unplug its underlying
@@ -862,42 +888,37 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
* sync the dirty pages of the bitmap file to disk */
void bitmap_unplug(struct bitmap *bitmap)
{
- unsigned long i, flags;
+ unsigned long i;
int dirty, need_write;
- struct page *page;
int wait = 0;
- if (!bitmap)
+ if (!bitmap || !bitmap->storage.filemap ||
+ test_bit(BITMAP_STALE, &bitmap->flags))
return;
/* look at each page to see if there are any set bits that need to be
* flushed out to disk */
- for (i = 0; i < bitmap->file_pages; i++) {
- spin_lock_irqsave(&bitmap->lock, flags);
- if (!bitmap->filemap) {
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ for (i = 0; i < bitmap->storage.file_pages; i++) {
+ if (!bitmap->storage.filemap)
return;
+ dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
+ need_write = test_and_clear_page_attr(bitmap, i,
+ BITMAP_PAGE_NEEDWRITE);
+ if (dirty || need_write) {
+ clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING);
+ write_page(bitmap, bitmap->storage.filemap[i], 0);
}
- page = bitmap->filemap[i];
- dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
- need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
- clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
- clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
if (dirty)
wait = 1;
- spin_unlock_irqrestore(&bitmap->lock, flags);
-
- if (dirty || need_write)
- write_page(bitmap, page, 0);
}
if (wait) { /* if any writes were performed, we need to wait on them */
- if (bitmap->file)
+ if (bitmap->storage.file)
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
else
md_super_wait(bitmap->mddev);
}
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
bitmap_file_kick(bitmap);
}
EXPORT_SYMBOL(bitmap_unplug);
@@ -917,98 +938,77 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int n
static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
{
unsigned long i, chunks, index, oldindex, bit;
- struct page *page = NULL, *oldpage = NULL;
- unsigned long num_pages, bit_cnt = 0;
+ struct page *page = NULL;
+ unsigned long bit_cnt = 0;
struct file *file;
- unsigned long bytes, offset;
+ unsigned long offset;
int outofdate;
int ret = -ENOSPC;
void *paddr;
+ struct bitmap_storage *store = &bitmap->storage;
- chunks = bitmap->chunks;
- file = bitmap->file;
+ chunks = bitmap->counts.chunks;
+ file = store->file;
- BUG_ON(!file && !bitmap->mddev->bitmap_info.offset);
+ if (!file && !bitmap->mddev->bitmap_info.offset) {
+ /* No permanent bitmap - fill with '1s'. */
+ store->filemap = NULL;
+ store->file_pages = 0;
+ for (i = 0; i < chunks ; i++) {
+ /* if the disk bit is set, set the memory bit */
+ int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift)
+ >= start);
+ bitmap_set_memory_bits(bitmap,
+ (sector_t)i << bitmap->counts.chunkshift,
+ needed);
+ }
+ return 0;
+ }
- outofdate = bitmap->flags & BITMAP_STALE;
+ outofdate = test_bit(BITMAP_STALE, &bitmap->flags);
if (outofdate)
printk(KERN_INFO "%s: bitmap file is out of date, doing full "
"recovery\n", bmname(bitmap));
- bytes = DIV_ROUND_UP(bitmap->chunks, 8);
- if (!bitmap->mddev->bitmap_info.external)
- bytes += sizeof(bitmap_super_t);
-
- num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
-
- if (file && i_size_read(file->f_mapping->host) < bytes) {
+ if (file && i_size_read(file->f_mapping->host) < store->bytes) {
printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n",
- bmname(bitmap),
- (unsigned long) i_size_read(file->f_mapping->host),
- bytes);
+ bmname(bitmap),
+ (unsigned long) i_size_read(file->f_mapping->host),
+ store->bytes);
goto err;
}
- ret = -ENOMEM;
-
- bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
- if (!bitmap->filemap)
- goto err;
-
- /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */
- bitmap->filemap_attr = kzalloc(
- roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
- GFP_KERNEL);
- if (!bitmap->filemap_attr)
- goto err;
-
oldindex = ~0L;
+ offset = 0;
+ if (!bitmap->mddev->bitmap_info.external)
+ offset = sizeof(bitmap_super_t);
for (i = 0; i < chunks; i++) {
int b;
- index = file_page_index(bitmap, i);
- bit = file_page_offset(bitmap, i);
+ index = file_page_index(&bitmap->storage, i);
+ bit = file_page_offset(&bitmap->storage, i);
if (index != oldindex) { /* this is a new page, read it in */
int count;
/* unmap the old page, we're done with it */
- if (index == num_pages-1)
- count = bytes - index * PAGE_SIZE;
+ if (index == store->file_pages-1)
+ count = store->bytes - index * PAGE_SIZE;
else
count = PAGE_SIZE;
- if (index == 0 && bitmap->sb_page) {
- /*
- * if we're here then the superblock page
- * contains some bits (PAGE_SIZE != sizeof sb)
- * we've already read it in, so just use it
- */
- page = bitmap->sb_page;
- offset = sizeof(bitmap_super_t);
- if (!file)
- page = read_sb_page(
- bitmap->mddev,
- bitmap->mddev->bitmap_info.offset,
- page,
- index, count);
- } else if (file) {
- page = read_page(file, index, bitmap, count);
- offset = 0;
- } else {
- page = read_sb_page(bitmap->mddev,
- bitmap->mddev->bitmap_info.offset,
- NULL,
- index, count);
- offset = 0;
- }
- if (IS_ERR(page)) { /* read error */
- ret = PTR_ERR(page);
+ page = store->filemap[index];
+ if (file)
+ ret = read_page(file, index, bitmap,
+ count, page);
+ else
+ ret = read_sb_page(
+ bitmap->mddev,
+ bitmap->mddev->bitmap_info.offset,
+ page,
+ index, count);
+
+ if (ret)
goto err;
- }
oldindex = index;
- oldpage = page;
-
- bitmap->filemap[bitmap->file_pages++] = page;
- bitmap->last_page_size = count;
if (outofdate) {
/*
@@ -1022,39 +1022,33 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
write_page(bitmap, page, 1);
ret = -EIO;
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR,
+ &bitmap->flags))
goto err;
}
}
paddr = kmap_atomic(page);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
+ if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
b = test_bit(bit, paddr);
else
b = test_bit_le(bit, paddr);
kunmap_atomic(paddr);
if (b) {
/* if the disk bit is set, set the memory bit */
- int needed = ((sector_t)(i+1) << bitmap->chunkshift
+ int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift
>= start);
bitmap_set_memory_bits(bitmap,
- (sector_t)i << bitmap->chunkshift,
+ (sector_t)i << bitmap->counts.chunkshift,
needed);
bit_cnt++;
}
- }
-
- /* everything went OK */
- ret = 0;
- bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET);
-
- if (bit_cnt) { /* Kick recovery if any bits were set */
- set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
- md_wakeup_thread(bitmap->mddev->thread);
+ offset = 0;
}
printk(KERN_INFO "%s: bitmap initialized from disk: "
- "read %lu/%lu pages, set %lu of %lu bits\n",
- bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, chunks);
+ "read %lu pages, set %lu of %lu bits\n",
+ bmname(bitmap), store->file_pages,
+ bit_cnt, chunks);
return 0;
@@ -1071,22 +1065,38 @@ void bitmap_write_all(struct bitmap *bitmap)
*/
int i;
- spin_lock_irq(&bitmap->lock);
- for (i = 0; i < bitmap->file_pages; i++)
- set_page_attr(bitmap, bitmap->filemap[i],
+ if (!bitmap || !bitmap->storage.filemap)
+ return;
+ if (bitmap->storage.file)
+ /* Only one copy, so nothing needed */
+ return;
+
+ for (i = 0; i < bitmap->storage.file_pages; i++)
+ set_page_attr(bitmap, i,
BITMAP_PAGE_NEEDWRITE);
bitmap->allclean = 0;
- spin_unlock_irq(&bitmap->lock);
}
-static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc)
+static void bitmap_count_page(struct bitmap_counts *bitmap,
+ sector_t offset, int inc)
{
sector_t chunk = offset >> bitmap->chunkshift;
unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
bitmap->bp[page].count += inc;
bitmap_checkfree(bitmap, page);
}
-static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap,
+
+static void bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset)
+{
+ sector_t chunk = offset >> bitmap->chunkshift;
+ unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
+ struct bitmap_page *bp = &bitmap->bp[page];
+
+ if (!bp->pending)
+ bp->pending = 1;
+}
+
+static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap,
sector_t offset, sector_t *blocks,
int create);
@@ -1099,10 +1109,9 @@ void bitmap_daemon_work(struct mddev *mddev)
{
struct bitmap *bitmap;
unsigned long j;
- unsigned long flags;
- struct page *page = NULL, *lastpage = NULL;
+ unsigned long nextpage;
sector_t blocks;
- void *paddr;
+ struct bitmap_counts *counts;
/* Use a mutex to guard daemon_work against
* bitmap_destroy.
@@ -1124,112 +1133,90 @@ void bitmap_daemon_work(struct mddev *mddev)
}
bitmap->allclean = 1;
- spin_lock_irqsave(&bitmap->lock, flags);
- for (j = 0; j < bitmap->chunks; j++) {
+ /* Any file-page which is PENDING now needs to be written.
+ * So set NEEDWRITE now, then after we make any last-minute changes
+ * we will write it.
+ */
+ for (j = 0; j < bitmap->storage.file_pages; j++)
+ if (test_and_clear_page_attr(bitmap, j,
+ BITMAP_PAGE_PENDING))
+ set_page_attr(bitmap, j,
+ BITMAP_PAGE_NEEDWRITE);
+
+ if (bitmap->need_sync &&
+ mddev->bitmap_info.external == 0) {
+ /* Arrange for superblock update as well as
+ * other changes */
+ bitmap_super_t *sb;
+ bitmap->need_sync = 0;
+ if (bitmap->storage.filemap) {
+ sb = kmap_atomic(bitmap->storage.sb_page);
+ sb->events_cleared =
+ cpu_to_le64(bitmap->events_cleared);
+ kunmap_atomic(sb);
+ set_page_attr(bitmap, 0,
+ BITMAP_PAGE_NEEDWRITE);
+ }
+ }
+ /* Now look at the bitmap counters and if any are '2' or '1',
+ * decrement and handle accordingly.
+ */
+ counts = &bitmap->counts;
+ spin_lock_irq(&counts->lock);
+ nextpage = 0;
+ for (j = 0; j < counts->chunks; j++) {
bitmap_counter_t *bmc;
- if (!bitmap->filemap)
- /* error or shutdown */
- break;
+ sector_t block = (sector_t)j << counts->chunkshift;
- page = filemap_get_page(bitmap, j);
-
- if (page != lastpage) {
- /* skip this page unless it's marked as needing cleaning */
- if (!test_page_attr(bitmap, page, BITMAP_PAGE_PENDING)) {
- int need_write = test_page_attr(bitmap, page,
- BITMAP_PAGE_NEEDWRITE);
- if (need_write)
- clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
-
- spin_unlock_irqrestore(&bitmap->lock, flags);
- if (need_write)
- write_page(bitmap, page, 0);
- spin_lock_irqsave(&bitmap->lock, flags);
- j |= (PAGE_BITS - 1);
+ if (j == nextpage) {
+ nextpage += PAGE_COUNTER_RATIO;
+ if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) {
+ j |= PAGE_COUNTER_MASK;
continue;
}
-
- /* grab the new page, sync and release the old */
- if (lastpage != NULL) {
- if (test_page_attr(bitmap, lastpage,
- BITMAP_PAGE_NEEDWRITE)) {
- clear_page_attr(bitmap, lastpage,
- BITMAP_PAGE_NEEDWRITE);
- spin_unlock_irqrestore(&bitmap->lock, flags);
- write_page(bitmap, lastpage, 0);
- } else {
- set_page_attr(bitmap, lastpage,
- BITMAP_PAGE_NEEDWRITE);
- bitmap->allclean = 0;
- spin_unlock_irqrestore(&bitmap->lock, flags);
- }
- } else
- spin_unlock_irqrestore(&bitmap->lock, flags);
- lastpage = page;
-
- /* We are possibly going to clear some bits, so make
- * sure that events_cleared is up-to-date.
- */
- if (bitmap->need_sync &&
- mddev->bitmap_info.external == 0) {
- bitmap_super_t *sb;
- bitmap->need_sync = 0;
- sb = kmap_atomic(bitmap->sb_page);
- sb->events_cleared =
- cpu_to_le64(bitmap->events_cleared);
- kunmap_atomic(sb);
- write_page(bitmap, bitmap->sb_page, 1);
- }
- spin_lock_irqsave(&bitmap->lock, flags);
- if (!bitmap->need_sync)
- clear_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
- else
- bitmap->allclean = 0;
+ counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0;
}
- bmc = bitmap_get_counter(bitmap,
- (sector_t)j << bitmap->chunkshift,
+ bmc = bitmap_get_counter(counts,
+ block,
&blocks, 0);
- if (!bmc)
+
+ if (!bmc) {
j |= PAGE_COUNTER_MASK;
- else if (*bmc) {
- if (*bmc == 1 && !bitmap->need_sync) {
- /* we can clear the bit */
- *bmc = 0;
- bitmap_count_page(bitmap,
- (sector_t)j << bitmap->chunkshift,
- -1);
-
- /* clear the bit */
- paddr = kmap_atomic(page);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
- clear_bit(file_page_offset(bitmap, j),
- paddr);
- else
- __clear_bit_le(
- file_page_offset(bitmap,
- j),
- paddr);
- kunmap_atomic(paddr);
- } else if (*bmc <= 2) {
- *bmc = 1; /* maybe clear the bit next time */
- set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
- bitmap->allclean = 0;
- }
+ continue;
}
- }
- spin_unlock_irqrestore(&bitmap->lock, flags);
-
- /* now sync the final page */
- if (lastpage != NULL) {
- spin_lock_irqsave(&bitmap->lock, flags);
- if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) {
- clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
- spin_unlock_irqrestore(&bitmap->lock, flags);
- write_page(bitmap, lastpage, 0);
- } else {
- set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
+ if (*bmc == 1 && !bitmap->need_sync) {
+ /* We can clear the bit */
+ *bmc = 0;
+ bitmap_count_page(counts, block, -1);
+ bitmap_file_clear_bit(bitmap, block);
+ } else if (*bmc && *bmc <= 2) {
+ *bmc = 1;
+ bitmap_set_pending(counts, block);
bitmap->allclean = 0;
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ }
+ }
+ spin_unlock_irq(&counts->lock);
+
+ /* Now start writeout on any page in NEEDWRITE that isn't DIRTY.
+ * DIRTY pages need to be written by bitmap_unplug so it can wait
+ * for them.
+ * If we find any DIRTY page we stop there and let bitmap_unplug
+ * handle all the rest. This is important in the case where
+ * the first blocking holds the superblock and it has been updated.
+ * We mustn't write any other blocks before the superblock.
+ */
+ for (j = 0;
+ j < bitmap->storage.file_pages
+ && !test_bit(BITMAP_STALE, &bitmap->flags);
+ j++) {
+
+ if (test_page_attr(bitmap, j,
+ BITMAP_PAGE_DIRTY))
+ /* bitmap_unplug will handle the rest */
+ break;
+ if (test_and_clear_page_attr(bitmap, j,
+ BITMAP_PAGE_NEEDWRITE)) {
+ write_page(bitmap, bitmap->storage.filemap[j], 0);
}
}
@@ -1240,7 +1227,7 @@ void bitmap_daemon_work(struct mddev *mddev)
mutex_unlock(&mddev->bitmap_info.mutex);
}
-static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap,
+static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap,
sector_t offset, sector_t *blocks,
int create)
__releases(bitmap->lock)
@@ -1302,10 +1289,10 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect
sector_t blocks;
bitmap_counter_t *bmc;
- spin_lock_irq(&bitmap->lock);
- bmc = bitmap_get_counter(bitmap, offset, &blocks, 1);
+ spin_lock_irq(&bitmap->counts.lock);
+ bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 1);
if (!bmc) {
- spin_unlock_irq(&bitmap->lock);
+ spin_unlock_irq(&bitmap->counts.lock);
return 0;
}
@@ -1317,7 +1304,7 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect
*/
prepare_to_wait(&bitmap->overflow_wait, &__wait,
TASK_UNINTERRUPTIBLE);
- spin_unlock_irq(&bitmap->lock);
+ spin_unlock_irq(&bitmap->counts.lock);
io_schedule();
finish_wait(&bitmap->overflow_wait, &__wait);
continue;
@@ -1326,7 +1313,7 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect
switch (*bmc) {
case 0:
bitmap_file_set_bit(bitmap, offset);
- bitmap_count_page(bitmap, offset, 1);
+ bitmap_count_page(&bitmap->counts, offset, 1);
/* fall through */
case 1:
*bmc = 2;
@@ -1334,7 +1321,7 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect
(*bmc)++;
- spin_unlock_irq(&bitmap->lock);
+ spin_unlock_irq(&bitmap->counts.lock);
offset += blocks;
if (sectors > blocks)
@@ -1364,10 +1351,10 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
unsigned long flags;
bitmap_counter_t *bmc;
- spin_lock_irqsave(&bitmap->lock, flags);
- bmc = bitmap_get_counter(bitmap, offset, &blocks, 0);
+ spin_lock_irqsave(&bitmap->counts.lock, flags);
+ bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 0);
if (!bmc) {
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ spin_unlock_irqrestore(&bitmap->counts.lock, flags);
return;
}
@@ -1386,14 +1373,10 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
(*bmc)--;
if (*bmc <= 2) {
- set_page_attr(bitmap,
- filemap_get_page(
- bitmap,
- offset >> bitmap->chunkshift),
- BITMAP_PAGE_PENDING);
+ bitmap_set_pending(&bitmap->counts, offset);
bitmap->allclean = 0;
}
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ spin_unlock_irqrestore(&bitmap->counts.lock, flags);
offset += blocks;
if (sectors > blocks)
sectors -= blocks;
@@ -1412,8 +1395,8 @@ static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t
*blocks = 1024;
return 1; /* always resync if no bitmap */
}
- spin_lock_irq(&bitmap->lock);
- bmc = bitmap_get_counter(bitmap, offset, blocks, 0);
+ spin_lock_irq(&bitmap->counts.lock);
+ bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
rv = 0;
if (bmc) {
/* locked */
@@ -1427,7 +1410,7 @@ static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t
}
}
}
- spin_unlock_irq(&bitmap->lock);
+ spin_unlock_irq(&bitmap->counts.lock);
return rv;
}
@@ -1464,8 +1447,8 @@ void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, i
*blocks = 1024;
return;
}
- spin_lock_irqsave(&bitmap->lock, flags);
- bmc = bitmap_get_counter(bitmap, offset, blocks, 0);
+ spin_lock_irqsave(&bitmap->counts.lock, flags);
+ bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
if (bmc == NULL)
goto unlock;
/* locked */
@@ -1476,15 +1459,13 @@ void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, i
*bmc |= NEEDED_MASK;
else {
if (*bmc <= 2) {
- set_page_attr(bitmap,
- filemap_get_page(bitmap, offset >> bitmap->chunkshift),
- BITMAP_PAGE_PENDING);
+ bitmap_set_pending(&bitmap->counts, offset);
bitmap->allclean = 0;
}
}
}
unlock:
- spin_unlock_irqrestore(&bitmap->lock, flags);
+ spin_unlock_irqrestore(&bitmap->counts.lock, flags);
}
EXPORT_SYMBOL(bitmap_end_sync);
@@ -1524,7 +1505,7 @@ void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector)
bitmap->mddev->curr_resync_completed = sector;
set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags);
- sector &= ~((1ULL << bitmap->chunkshift) - 1);
+ sector &= ~((1ULL << bitmap->counts.chunkshift) - 1);
s = 0;
while (s < sector && s < bitmap->mddev->resync_max_sectors) {
bitmap_end_sync(bitmap, s, &blocks, 0);
@@ -1538,27 +1519,25 @@ EXPORT_SYMBOL(bitmap_cond_end_sync);
static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
{
/* For each chunk covered by any of these sectors, set the
- * counter to 1 and set resync_needed. They should all
+ * counter to 2 and possibly set resync_needed. They should all
* be 0 at this point
*/
sector_t secs;
bitmap_counter_t *bmc;
- spin_lock_irq(&bitmap->lock);
- bmc = bitmap_get_counter(bitmap, offset, &secs, 1);
+ spin_lock_irq(&bitmap->counts.lock);
+ bmc = bitmap_get_counter(&bitmap->counts, offset, &secs, 1);
if (!bmc) {
- spin_unlock_irq(&bitmap->lock);
+ spin_unlock_irq(&bitmap->counts.lock);
return;
}
if (!*bmc) {
- struct page *page;
*bmc = 2 | (needed ? NEEDED_MASK : 0);
- bitmap_count_page(bitmap, offset, 1);
- page = filemap_get_page(bitmap, offset >> bitmap->chunkshift);
- set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
+ bitmap_count_page(&bitmap->counts, offset, 1);
+ bitmap_set_pending(&bitmap->counts, offset);
bitmap->allclean = 0;
}
- spin_unlock_irq(&bitmap->lock);
+ spin_unlock_irq(&bitmap->counts.lock);
}
/* dirty the memory and file bits for bitmap chunks "s" to "e" */
@@ -1567,11 +1546,9 @@ void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
unsigned long chunk;
for (chunk = s; chunk <= e; chunk++) {
- sector_t sec = (sector_t)chunk << bitmap->chunkshift;
+ sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift;
bitmap_set_memory_bits(bitmap, sec, 1);
- spin_lock_irq(&bitmap->lock);
bitmap_file_set_bit(bitmap, sec);
- spin_unlock_irq(&bitmap->lock);
if (sec < bitmap->mddev->recovery_cp)
/* We are asserting that the array is dirty,
* so move the recovery_cp address back so
@@ -1616,11 +1593,15 @@ static void bitmap_free(struct bitmap *bitmap)
if (!bitmap) /* there was no bitmap */
return;
- /* release the bitmap file and kill the daemon */
- bitmap_file_put(bitmap);
+ /* Shouldn't be needed - but just in case.... */
+ wait_event(bitmap->write_wait,
+ atomic_read(&bitmap->pending_writes) == 0);
+
+ /* release the bitmap file */
+ bitmap_file_unmap(&bitmap->storage);
- bp = bitmap->bp;
- pages = bitmap->pages;
+ bp = bitmap->counts.bp;
+ pages = bitmap->counts.pages;
/* free all allocated memory */
@@ -1659,25 +1640,19 @@ int bitmap_create(struct mddev *mddev)
{
struct bitmap *bitmap;
sector_t blocks = mddev->resync_max_sectors;
- unsigned long chunks;
- unsigned long pages;
struct file *file = mddev->bitmap_info.file;
int err;
struct sysfs_dirent *bm = NULL;
BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
- if (!file
- && !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */
- return 0;
-
BUG_ON(file && mddev->bitmap_info.offset);
bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
if (!bitmap)
return -ENOMEM;
- spin_lock_init(&bitmap->lock);
+ spin_lock_init(&bitmap->counts.lock);
atomic_set(&bitmap->pending_writes, 0);
init_waitqueue_head(&bitmap->write_wait);
init_waitqueue_head(&bitmap->overflow_wait);
@@ -1693,7 +1668,7 @@ int bitmap_create(struct mddev *mddev)
} else
bitmap->sysfs_can_clear = NULL;
- bitmap->file = file;
+ bitmap->storage.file = file;
if (file) {
get_file(file);
/* As future accesses to this file will use bmap,
@@ -1724,32 +1699,15 @@ int bitmap_create(struct mddev *mddev)
goto error;
bitmap->daemon_lastrun = jiffies;
- bitmap->chunkshift = (ffz(~mddev->bitmap_info.chunksize)
- - BITMAP_BLOCK_SHIFT);
-
- chunks = (blocks + (1 << bitmap->chunkshift) - 1) >>
- bitmap->chunkshift;
- pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO;
-
- BUG_ON(!pages);
-
- bitmap->chunks = chunks;
- bitmap->pages = pages;
- bitmap->missing_pages = pages;
-
- bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL);
-
- err = -ENOMEM;
- if (!bitmap->bp)
+ err = bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1);
+ if (err)
goto error;
printk(KERN_INFO "created bitmap (%lu pages) for device %s\n",
- pages, bmname(bitmap));
+ bitmap->counts.pages, bmname(bitmap));
mddev->bitmap = bitmap;
-
-
- return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0;
+ return test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
error:
bitmap_free(bitmap);
@@ -1790,13 +1748,17 @@ int bitmap_load(struct mddev *mddev)
if (err)
goto out;
+ clear_bit(BITMAP_STALE, &bitmap->flags);
+
+ /* Kick recovery in case any bits were set */
+ set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;
md_wakeup_thread(mddev->thread);
bitmap_update_sb(bitmap);
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
err = -EIO;
out:
return err;
@@ -1806,30 +1768,194 @@ EXPORT_SYMBOL_GPL(bitmap_load);
void bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
{
unsigned long chunk_kb;
- unsigned long flags;
+ struct bitmap_counts *counts;
if (!bitmap)
return;
- spin_lock_irqsave(&bitmap->lock, flags);
+ counts = &bitmap->counts;
+
chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;
seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
"%lu%s chunk",
- bitmap->pages - bitmap->missing_pages,
- bitmap->pages,
- (bitmap->pages - bitmap->missing_pages)
+ counts->pages - counts->missing_pages,
+ counts->pages,
+ (counts->pages - counts->missing_pages)
<< (PAGE_SHIFT - 10),
chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,
chunk_kb ? "KB" : "B");
- if (bitmap->file) {
+ if (bitmap->storage.file) {
seq_printf(seq, ", file: ");
- seq_path(seq, &bitmap->file->f_path, " \t\n");
+ seq_path(seq, &bitmap->storage.file->f_path, " \t\n");
}
seq_printf(seq, "\n");
- spin_unlock_irqrestore(&bitmap->lock, flags);
}
+int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
+ int chunksize, int init)
+{
+ /* If chunk_size is 0, choose an appropriate chunk size.
+ * Then possibly allocate new storage space.
+ * Then quiesce, copy bits, replace bitmap, and re-start
+ *
+ * This function is called both to set up the initial bitmap
+ * and to resize the bitmap while the array is active.
+ * If this happens as a result of the array being resized,
+ * chunksize will be zero, and we need to choose a suitable
+ * chunksize, otherwise we use what we are given.
+ */
+ struct bitmap_storage store;
+ struct bitmap_counts old_counts;
+ unsigned long chunks;
+ sector_t block;
+ sector_t old_blocks, new_blocks;
+ int chunkshift;
+ int ret = 0;
+ long pages;
+ struct bitmap_page *new_bp;
+
+ if (chunksize == 0) {
+ /* If there is enough space, leave the chunk size unchanged,
+ * else increase by factor of two until there is enough space.
+ */
+ long bytes;
+ long space = bitmap->mddev->bitmap_info.space;
+
+ if (space == 0) {
+ /* We don't know how much space there is, so limit
+ * to current size - in sectors.
+ */
+ bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8);
+ if (!bitmap->mddev->bitmap_info.external)
+ bytes += sizeof(bitmap_super_t);
+ space = DIV_ROUND_UP(bytes, 512);
+ bitmap->mddev->bitmap_info.space = space;
+ }
+ chunkshift = bitmap->counts.chunkshift;
+ chunkshift--;
+ do {
+ /* 'chunkshift' is shift from block size to chunk size */
+ chunkshift++;
+ chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
+ bytes = DIV_ROUND_UP(chunks, 8);
+ if (!bitmap->mddev->bitmap_info.external)
+ bytes += sizeof(bitmap_super_t);
+ } while (bytes > (space << 9));
+ } else
+ chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT;
+
+ chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
+ memset(&store, 0, sizeof(store));
+ if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file)
+ ret = bitmap_storage_alloc(&store, chunks,
+ !bitmap->mddev->bitmap_info.external);
+ if (ret)
+ goto err;
+
+ pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO);
+
+ new_bp = kzalloc(pages * sizeof(*new_bp), GFP_KERNEL);
+ ret = -ENOMEM;
+ if (!new_bp) {
+ bitmap_file_unmap(&store);
+ goto err;
+ }
+
+ if (!init)
+ bitmap->mddev->pers->quiesce(bitmap->mddev, 1);
+
+ store.file = bitmap->storage.file;
+ bitmap->storage.file = NULL;
+
+ if (store.sb_page && bitmap->storage.sb_page)
+ memcpy(page_address(store.sb_page),
+ page_address(bitmap->storage.sb_page),
+ sizeof(bitmap_super_t));
+ bitmap_file_unmap(&bitmap->storage);
+ bitmap->storage = store;
+
+ old_counts = bitmap->counts;
+ bitmap->counts.bp = new_bp;
+ bitmap->counts.pages = pages;
+ bitmap->counts.missing_pages = pages;
+ bitmap->counts.chunkshift = chunkshift;
+ bitmap->counts.chunks = chunks;
+ bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift +
+ BITMAP_BLOCK_SHIFT);
+
+ blocks = min(old_counts.chunks << old_counts.chunkshift,
+ chunks << chunkshift);
+
+ spin_lock_irq(&bitmap->counts.lock);
+ for (block = 0; block < blocks; ) {
+ bitmap_counter_t *bmc_old, *bmc_new;
+ int set;
+
+ bmc_old = bitmap_get_counter(&old_counts, block,
+ &old_blocks, 0);
+ set = bmc_old && NEEDED(*bmc_old);
+
+ if (set) {
+ bmc_new = bitmap_get_counter(&bitmap->counts, block,
+ &new_blocks, 1);
+ if (*bmc_new == 0) {
+ /* need to set on-disk bits too. */
+ sector_t end = block + new_blocks;
+ sector_t start = block >> chunkshift;
+ start <<= chunkshift;
+ while (start < end) {
+ bitmap_file_set_bit(bitmap, block);
+ start += 1 << chunkshift;
+ }
+ *bmc_new = 2;
+ bitmap_count_page(&bitmap->counts,
+ block, 1);
+ bitmap_set_pending(&bitmap->counts,
+ block);
+ }
+ *bmc_new |= NEEDED_MASK;
+ if (new_blocks < old_blocks)
+ old_blocks = new_blocks;
+ }
+ block += old_blocks;
+ }
+
+ if (!init) {
+ int i;
+ while (block < (chunks << chunkshift)) {
+ bitmap_counter_t *bmc;
+ bmc = bitmap_get_counter(&bitmap->counts, block,
+ &new_blocks, 1);
+ if (bmc) {
+ /* new space. It needs to be resynced, so
+ * we set NEEDED_MASK.
+ */
+ if (*bmc == 0) {
+ *bmc = NEEDED_MASK | 2;
+ bitmap_count_page(&bitmap->counts,
+ block, 1);
+ bitmap_set_pending(&bitmap->counts,
+ block);
+ }
+ }
+ block += new_blocks;
+ }
+ for (i = 0; i < bitmap->storage.file_pages; i++)
+ set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
+ }
+ spin_unlock_irq(&bitmap->counts.lock);
+
+ if (!init) {
+ bitmap_unplug(bitmap);
+ bitmap->mddev->pers->quiesce(bitmap->mddev, 0);
+ }
+ ret = 0;
+err:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(bitmap_resize);
+
static ssize_t
location_show(struct mddev *mddev, char *page)
{
@@ -1923,6 +2049,43 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
static struct md_sysfs_entry bitmap_location =
__ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store);
+/* 'bitmap/space' is the space available at 'location' for the
+ * bitmap. This allows the kernel to know when it is safe to
+ * resize the bitmap to match a resized array.
+ */
+static ssize_t
+space_show(struct mddev *mddev, char *page)
+{
+ return sprintf(page, "%lu\n", mddev->bitmap_info.space);
+}
+
+static ssize_t
+space_store(struct mddev *mddev, const char *buf, size_t len)
+{
+ unsigned long sectors;
+ int rv;
+
+ rv = kstrtoul(buf, 10, &sectors);
+ if (rv)
+ return rv;
+
+ if (sectors == 0)
+ return -EINVAL;
+
+ if (mddev->bitmap &&
+ sectors < (mddev->bitmap->storage.bytes + 511) >> 9)
+ return -EFBIG; /* Bitmap is too big for this small space */
+
+ /* could make sure it isn't too big, but that isn't really
+ * needed - user-space should be careful.
+ */
+ mddev->bitmap_info.space = sectors;
+ return len;
+}
+
+static struct md_sysfs_entry bitmap_space =
+__ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store);
+
static ssize_t
timeout_show(struct mddev *mddev, char *page)
{
@@ -2098,6 +2261,7 @@ __ATTR(max_backlog_used, S_IRUGO | S_IWUSR,
static struct attribute *md_bitmap_attrs[] = {
&bitmap_location.attr,
+ &bitmap_space.attr,
&bitmap_timeout.attr,
&bitmap_backlog.attr,
&bitmap_chunksize.attr,
diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h
index b44b0aba..df4aeb6 100644
--- a/drivers/md/bitmap.h
+++ b/drivers/md/bitmap.h
@@ -111,9 +111,9 @@ typedef __u16 bitmap_counter_t;
/* use these for bitmap->flags and bitmap->sb->state bit-fields */
enum bitmap_state {
- BITMAP_STALE = 0x002, /* the bitmap file is out of date or had -EIO */
- BITMAP_WRITE_ERROR = 0x004, /* A write error has occurred */
- BITMAP_HOSTENDIAN = 0x8000,
+ BITMAP_STALE = 1, /* the bitmap file is out of date or had -EIO */
+ BITMAP_WRITE_ERROR = 2, /* A write error has occurred */
+ BITMAP_HOSTENDIAN =15,
};
/* the superblock at the front of the bitmap file -- little endian */
@@ -128,8 +128,10 @@ typedef struct bitmap_super_s {
__le32 chunksize; /* 52 the bitmap chunk size in bytes */
__le32 daemon_sleep; /* 56 seconds between disk flushes */
__le32 write_behind; /* 60 number of outstanding write-behind writes */
+ __le32 sectors_reserved; /* 64 number of 512-byte sectors that are
+ * reserved for the bitmap. */
- __u8 pad[256 - 64]; /* set to zero */
+ __u8 pad[256 - 68]; /* set to zero */
} bitmap_super_t;
/* notes:
@@ -160,35 +162,48 @@ struct bitmap_page {
*/
unsigned int hijacked:1;
/*
+ * If any counter in this page is '1' or '2' - and so could be
+ * cleared then that page is marked as 'pending'
+ */
+ unsigned int pending:1;
+ /*
* count of dirty bits on the page
*/
- unsigned int count:31;
+ unsigned int count:30;
};
/* the main bitmap structure - one per mddev */
struct bitmap {
- struct bitmap_page *bp;
- unsigned long pages; /* total number of pages in the bitmap */
- unsigned long missing_pages; /* number of pages not yet allocated */
- struct mddev *mddev; /* the md device that the bitmap is for */
+ struct bitmap_counts {
+ spinlock_t lock;
+ struct bitmap_page *bp;
+ unsigned long pages; /* total number of pages
+ * in the bitmap */
+ unsigned long missing_pages; /* number of pages
+ * not yet allocated */
+ unsigned long chunkshift; /* chunksize = 2^chunkshift
+ * (for bitops) */
+ unsigned long chunks; /* Total number of data
+ * chunks for the array */
+ } counts;
- /* bitmap chunksize -- how much data does each bit represent? */
- unsigned long chunkshift; /* chunksize = 2^(chunkshift+9) (for bitops) */
- unsigned long chunks; /* total number of data chunks for the array */
+ struct mddev *mddev; /* the md device that the bitmap is for */
__u64 events_cleared;
int need_sync;
- /* bitmap spinlock */
- spinlock_t lock;
-
- struct file *file; /* backing disk file */
- struct page *sb_page; /* cached copy of the bitmap file superblock */
- struct page **filemap; /* list of cache pages for the file */
- unsigned long *filemap_attr; /* attributes associated w/ filemap pages */
- unsigned long file_pages; /* number of pages in the file */
- int last_page_size; /* bytes in the last page */
+ struct bitmap_storage {
+ struct file *file; /* backing disk file */
+ struct page *sb_page; /* cached copy of the bitmap
+ * file superblock */
+ struct page **filemap; /* list of cache pages for
+ * the file */
+ unsigned long *filemap_attr; /* attributes associated
+ * w/ filemap pages */
+ unsigned long file_pages; /* number of pages in the file*/
+ unsigned long bytes; /* total bytes in the bitmap */
+ } storage;
unsigned long flags;
@@ -242,6 +257,9 @@ void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector);
void bitmap_unplug(struct bitmap *bitmap);
void bitmap_daemon_work(struct mddev *mddev);
+
+int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
+ int chunksize, int init);
#endif
#endif
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 68965e6..017c34d 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -155,10 +155,7 @@ static void context_free(struct raid_set *rs)
for (i = 0; i < rs->md.raid_disks; i++) {
if (rs->dev[i].meta_dev)
dm_put_device(rs->ti, rs->dev[i].meta_dev);
- if (rs->dev[i].rdev.sb_page)
- put_page(rs->dev[i].rdev.sb_page);
- rs->dev[i].rdev.sb_page = NULL;
- rs->dev[i].rdev.sb_loaded = 0;
+ md_rdev_clear(&rs->dev[i].rdev);
if (rs->dev[i].data_dev)
dm_put_device(rs->ti, rs->dev[i].data_dev);
}
@@ -606,7 +603,7 @@ static int read_disk_sb(struct md_rdev *rdev, int size)
if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) {
DMERR("Failed to read superblock of device at position %d",
rdev->raid_disk);
- set_bit(Faulty, &rdev->flags);
+ md_error(rdev->mddev, rdev);
return -EINVAL;
}
@@ -617,16 +614,18 @@ static int read_disk_sb(struct md_rdev *rdev, int size)
static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
{
- struct md_rdev *r;
+ int i;
uint64_t failed_devices;
struct dm_raid_superblock *sb;
+ struct raid_set *rs = container_of(mddev, struct raid_set, md);
sb = page_address(rdev->sb_page);
failed_devices = le64_to_cpu(sb->failed_devices);
- rdev_for_each(r, mddev)
- if ((r->raid_disk >= 0) && test_bit(Faulty, &r->flags))
- failed_devices |= (1ULL << r->raid_disk);
+ for (i = 0; i < mddev->raid_disks; i++)
+ if (!rs->dev[i].data_dev ||
+ test_bit(Faulty, &(rs->dev[i].rdev.flags)))
+ failed_devices |= (1ULL << i);
memset(sb, 0, sizeof(*sb));
@@ -1252,12 +1251,13 @@ static void raid_resume(struct dm_target *ti)
{
struct raid_set *rs = ti->private;
+ set_bit(MD_CHANGE_DEVS, &rs->md.flags);
if (!rs->bitmap_loaded) {
bitmap_load(&rs->md);
rs->bitmap_loaded = 1;
- } else
- md_wakeup_thread(rs->md.thread);
+ }
+ clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
mddev_resume(&rs->md);
}
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 01233d8..1c2f904 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -402,6 +402,7 @@ void mddev_resume(struct mddev *mddev)
wake_up(&mddev->sb_wait);
mddev->pers->quiesce(mddev, 0);
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
}
@@ -452,7 +453,7 @@ static void submit_flushes(struct work_struct *ws)
atomic_inc(&rdev->nr_pending);
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
- bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
+ bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
bi->bi_end_io = md_end_flush;
bi->bi_private = rdev;
bi->bi_bdev = rdev->bdev;
@@ -607,6 +608,7 @@ void mddev_init(struct mddev *mddev)
init_waitqueue_head(&mddev->sb_wait);
init_waitqueue_head(&mddev->recovery_wait);
mddev->reshape_position = MaxSector;
+ mddev->reshape_backwards = 0;
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
mddev->level = LEVEL_NONE;
@@ -802,7 +804,7 @@ static int alloc_disk_sb(struct md_rdev * rdev)
return 0;
}
-static void free_disk_sb(struct md_rdev * rdev)
+void md_rdev_clear(struct md_rdev *rdev)
{
if (rdev->sb_page) {
put_page(rdev->sb_page);
@@ -815,8 +817,10 @@ static void free_disk_sb(struct md_rdev * rdev)
put_page(rdev->bb_page);
rdev->bb_page = NULL;
}
+ kfree(rdev->badblocks.page);
+ rdev->badblocks.page = NULL;
}
-
+EXPORT_SYMBOL_GPL(md_rdev_clear);
static void super_written(struct bio *bio, int error)
{
@@ -887,6 +891,10 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
rdev->meta_bdev : rdev->bdev;
if (metadata_op)
bio->bi_sector = sector + rdev->sb_start;
+ else if (rdev->mddev->reshape_position != MaxSector &&
+ (rdev->mddev->reshape_backwards ==
+ (sector >= rdev->mddev->reshape_position)))
+ bio->bi_sector = sector + rdev->new_data_offset;
else
bio->bi_sector = sector + rdev->data_offset;
bio_add_page(bio, page, size, 0);
@@ -1034,12 +1042,17 @@ static unsigned int calc_sb_csum(mdp_super_t * sb)
struct super_type {
char *name;
struct module *owner;
- int (*load_super)(struct md_rdev *rdev, struct md_rdev *refdev,
+ int (*load_super)(struct md_rdev *rdev,
+ struct md_rdev *refdev,
int minor_version);
- int (*validate_super)(struct mddev *mddev, struct md_rdev *rdev);
- void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
+ int (*validate_super)(struct mddev *mddev,
+ struct md_rdev *rdev);
+ void (*sync_super)(struct mddev *mddev,
+ struct md_rdev *rdev);
unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
sector_t num_sectors);
+ int (*allow_new_offset)(struct md_rdev *rdev,
+ unsigned long long new_offset);
};
/*
@@ -1111,6 +1124,7 @@ static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor
rdev->preferred_minor = sb->md_minor;
rdev->data_offset = 0;
+ rdev->new_data_offset = 0;
rdev->sb_size = MD_SB_BYTES;
rdev->badblocks.shift = -1;
@@ -1184,7 +1198,11 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->dev_sectors = ((sector_t)sb->size) * 2;
mddev->events = ev1;
mddev->bitmap_info.offset = 0;
+ mddev->bitmap_info.space = 0;
+ /* bitmap can use 60 K after the 4K superblocks */
mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
+ mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
+ mddev->reshape_backwards = 0;
if (mddev->minor_version >= 91) {
mddev->reshape_position = sb->reshape_position;
@@ -1192,6 +1210,8 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->new_level = sb->new_level;
mddev->new_layout = sb->new_layout;
mddev->new_chunk_sectors = sb->new_chunk >> 9;
+ if (mddev->delta_disks < 0)
+ mddev->reshape_backwards = 1;
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
@@ -1218,9 +1238,12 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->max_disks = MD_SB_DISKS;
if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
- mddev->bitmap_info.file == NULL)
+ mddev->bitmap_info.file == NULL) {
mddev->bitmap_info.offset =
mddev->bitmap_info.default_offset;
+ mddev->bitmap_info.space =
+ mddev->bitmap_info.space;
+ }
} else if (mddev->pers == NULL) {
/* Insist on good event counter while assembling, except
@@ -1434,6 +1457,12 @@ super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
return num_sectors;
}
+static int
+super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
+{
+ /* non-zero offset changes not possible with v0.90 */
+ return new_offset == 0;
+}
/*
* version 1 superblock
@@ -1469,6 +1498,7 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
struct mdp_superblock_1 *sb;
int ret;
sector_t sb_start;
+ sector_t sectors;
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
int bmask;
@@ -1523,9 +1553,18 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
bdevname(rdev->bdev,b));
return -EINVAL;
}
+ if (sb->pad0 ||
+ sb->pad3[0] ||
+ memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
+ /* Some padding is non-zero, might be a new feature */
+ return -EINVAL;
rdev->preferred_minor = 0xffff;
rdev->data_offset = le64_to_cpu(sb->data_offset);
+ rdev->new_data_offset = rdev->data_offset;
+ if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
+ (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
+ rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
@@ -1536,6 +1575,9 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
if (minor_version
&& rdev->data_offset < sb_start + (rdev->sb_size/512))
return -EINVAL;
+ if (minor_version
+ && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
+ return -EINVAL;
if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
rdev->desc_nr = -1;
@@ -1607,16 +1649,14 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
else
ret = 0;
}
- if (minor_version)
- rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
- le64_to_cpu(sb->data_offset);
- else
- rdev->sectors = rdev->sb_start;
- if (rdev->sectors < le64_to_cpu(sb->data_size))
+ if (minor_version) {
+ sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
+ sectors -= rdev->data_offset;
+ } else
+ sectors = rdev->sb_start;
+ if (sectors < le64_to_cpu(sb->data_size))
return -EINVAL;
rdev->sectors = le64_to_cpu(sb->data_size);
- if (le64_to_cpu(sb->size) > rdev->sectors)
- return -EINVAL;
return ret;
}
@@ -1644,17 +1684,37 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->dev_sectors = le64_to_cpu(sb->size);
mddev->events = ev1;
mddev->bitmap_info.offset = 0;
+ mddev->bitmap_info.space = 0;
+ /* Default location for bitmap is 1K after superblock
+ * using 3K - total of 4K
+ */
mddev->bitmap_info.default_offset = 1024 >> 9;
-
+ mddev->bitmap_info.default_space = (4096-1024) >> 9;
+ mddev->reshape_backwards = 0;
+
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
memcpy(mddev->uuid, sb->set_uuid, 16);
mddev->max_disks = (4096-256)/2;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
- mddev->bitmap_info.file == NULL )
+ mddev->bitmap_info.file == NULL) {
mddev->bitmap_info.offset =
(__s32)le32_to_cpu(sb->bitmap_offset);
+ /* Metadata doesn't record how much space is available.
+ * For 1.0, we assume we can use up to the superblock
+ * if before, else to 4K beyond superblock.
+ * For others, assume no change is possible.
+ */
+ if (mddev->minor_version > 0)
+ mddev->bitmap_info.space = 0;
+ else if (mddev->bitmap_info.offset > 0)
+ mddev->bitmap_info.space =
+ 8 - mddev->bitmap_info.offset;
+ else
+ mddev->bitmap_info.space =
+ -mddev->bitmap_info.offset;
+ }
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
mddev->reshape_position = le64_to_cpu(sb->reshape_position);
@@ -1662,6 +1722,11 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->new_level = le32_to_cpu(sb->new_level);
mddev->new_layout = le32_to_cpu(sb->new_layout);
mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
+ if (mddev->delta_disks < 0 ||
+ (mddev->delta_disks == 0 &&
+ (le32_to_cpu(sb->feature_map)
+ & MD_FEATURE_RESHAPE_BACKWARDS)))
+ mddev->reshape_backwards = 1;
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
@@ -1735,7 +1800,6 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
sb->feature_map = 0;
sb->pad0 = 0;
sb->recovery_offset = cpu_to_le64(0);
- memset(sb->pad1, 0, sizeof(sb->pad1));
memset(sb->pad3, 0, sizeof(sb->pad3));
sb->utime = cpu_to_le64((__u64)mddev->utime);
@@ -1757,6 +1821,8 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
sb->devflags |= WriteMostly1;
else
sb->devflags &= ~WriteMostly1;
+ sb->data_offset = cpu_to_le64(rdev->data_offset);
+ sb->data_size = cpu_to_le64(rdev->sectors);
if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
@@ -1781,6 +1847,16 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
sb->delta_disks = cpu_to_le32(mddev->delta_disks);
sb->new_level = cpu_to_le32(mddev->new_level);
sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
+ if (mddev->delta_disks == 0 &&
+ mddev->reshape_backwards)
+ sb->feature_map
+ |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
+ if (rdev->new_data_offset != rdev->data_offset) {
+ sb->feature_map
+ |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
+ sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
+ - rdev->data_offset));
+ }
}
if (rdev->badblocks.count == 0)
@@ -1857,6 +1933,8 @@ super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
sector_t max_sectors;
if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
return 0; /* component must fit device */
+ if (rdev->data_offset != rdev->new_data_offset)
+ return 0; /* too confusing */
if (rdev->sb_start < rdev->data_offset) {
/* minor versions 1 and 2; superblock before data */
max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
@@ -1884,6 +1962,40 @@ super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
rdev->sb_page);
md_super_wait(rdev->mddev);
return num_sectors;
+
+}
+
+static int
+super_1_allow_new_offset(struct md_rdev *rdev,
+ unsigned long long new_offset)
+{
+ /* All necessary checks on new >= old have been done */
+ struct bitmap *bitmap;
+ if (new_offset >= rdev->data_offset)
+ return 1;
+
+ /* with 1.0 metadata, there is no metadata to tread on
+ * so we can always move back */
+ if (rdev->mddev->minor_version == 0)
+ return 1;
+
+ /* otherwise we must be sure not to step on
+ * any metadata, so stay:
+ * 36K beyond start of superblock
+ * beyond end of badblocks
+ * beyond write-intent bitmap
+ */
+ if (rdev->sb_start + (32+4)*2 > new_offset)
+ return 0;
+ bitmap = rdev->mddev->bitmap;
+ if (bitmap && !rdev->mddev->bitmap_info.file &&
+ rdev->sb_start + rdev->mddev->bitmap_info.offset +
+ bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
+ return 0;
+ if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
+ return 0;
+
+ return 1;
}
static struct super_type super_types[] = {
@@ -1894,6 +2006,7 @@ static struct super_type super_types[] = {
.validate_super = super_90_validate,
.sync_super = super_90_sync,
.rdev_size_change = super_90_rdev_size_change,
+ .allow_new_offset = super_90_allow_new_offset,
},
[1] = {
.name = "md-1",
@@ -1902,6 +2015,7 @@ static struct super_type super_types[] = {
.validate_super = super_1_validate,
.sync_super = super_1_sync,
.rdev_size_change = super_1_rdev_size_change,
+ .allow_new_offset = super_1_allow_new_offset,
},
};
@@ -2105,9 +2219,7 @@ static void unbind_rdev_from_array(struct md_rdev * rdev)
sysfs_remove_link(&rdev->kobj, "block");
sysfs_put(rdev->sysfs_state);
rdev->sysfs_state = NULL;
- kfree(rdev->badblocks.page);
rdev->badblocks.count = 0;
- rdev->badblocks.page = NULL;
/* We need to delay this, otherwise we can deadlock when
* writing to 'remove' to "dev/state". We also need
* to delay it due to rcu usage.
@@ -2158,7 +2270,7 @@ static void export_rdev(struct md_rdev * rdev)
bdevname(rdev->bdev,b));
if (rdev->mddev)
MD_BUG();
- free_disk_sb(rdev);
+ md_rdev_clear(rdev);
#ifndef MODULE
if (test_bit(AutoDetected, &rdev->flags))
md_autodetect_dev(rdev->bdev->bd_dev);
@@ -2809,9 +2921,8 @@ offset_show(struct md_rdev *rdev, char *page)
static ssize_t
offset_store(struct md_rdev *rdev, const char *buf, size_t len)
{
- char *e;
- unsigned long long offset = simple_strtoull(buf, &e, 10);
- if (e==buf || (*e && *e != '\n'))
+ unsigned long long offset;
+ if (strict_strtoull(buf, 10, &offset) < 0)
return -EINVAL;
if (rdev->mddev->pers && rdev->raid_disk >= 0)
return -EBUSY;
@@ -2826,6 +2937,63 @@ offset_store(struct md_rdev *rdev, const char *buf, size_t len)
static struct rdev_sysfs_entry rdev_offset =
__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
+static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
+{
+ return sprintf(page, "%llu\n",
+ (unsigned long long)rdev->new_data_offset);
+}
+
+static ssize_t new_offset_store(struct md_rdev *rdev,
+ const char *buf, size_t len)
+{
+ unsigned long long new_offset;
+ struct mddev *mddev = rdev->mddev;
+
+ if (strict_strtoull(buf, 10, &new_offset) < 0)
+ return -EINVAL;
+
+ if (mddev->sync_thread)
+ return -EBUSY;
+ if (new_offset == rdev->data_offset)
+ /* reset is always permitted */
+ ;
+ else if (new_offset > rdev->data_offset) {
+ /* must not push array size beyond rdev_sectors */
+ if (new_offset - rdev->data_offset
+ + mddev->dev_sectors > rdev->sectors)
+ return -E2BIG;
+ }
+ /* Metadata worries about other space details. */
+
+ /* decreasing the offset is inconsistent with a backwards
+ * reshape.
+ */
+ if (new_offset < rdev->data_offset &&
+ mddev->reshape_backwards)
+ return -EINVAL;
+ /* Increasing offset is inconsistent with forwards
+ * reshape. reshape_direction should be set to
+ * 'backwards' first.
+ */
+ if (new_offset > rdev->data_offset &&
+ !mddev->reshape_backwards)
+ return -EINVAL;
+
+ if (mddev->pers && mddev->persistent &&
+ !super_types[mddev->major_version]
+ .allow_new_offset(rdev, new_offset))
+ return -E2BIG;
+ rdev->new_data_offset = new_offset;
+ if (new_offset > rdev->data_offset)
+ mddev->reshape_backwards = 1;
+ else if (new_offset < rdev->data_offset)
+ mddev->reshape_backwards = 0;
+
+ return len;
+}
+static struct rdev_sysfs_entry rdev_new_offset =
+__ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
+
static ssize_t
rdev_size_show(struct md_rdev *rdev, char *page)
{
@@ -2870,6 +3038,8 @@ rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
if (strict_blocks_to_sectors(buf, &sectors) < 0)
return -EINVAL;
+ if (rdev->data_offset != rdev->new_data_offset)
+ return -EINVAL; /* too confusing */
if (my_mddev->pers && rdev->raid_disk >= 0) {
if (my_mddev->persistent) {
sectors = super_types[my_mddev->major_version].
@@ -3006,6 +3176,7 @@ static struct attribute *rdev_default_attrs[] = {
&rdev_errors.attr,
&rdev_slot.attr,
&rdev_offset.attr,
+ &rdev_new_offset.attr,
&rdev_size.attr,
&rdev_recovery_start.attr,
&rdev_bad_blocks.attr,
@@ -3080,6 +3251,7 @@ int md_rdev_init(struct md_rdev *rdev)
rdev->raid_disk = -1;
rdev->flags = 0;
rdev->data_offset = 0;
+ rdev->new_data_offset = 0;
rdev->sb_events = 0;
rdev->last_read_error.tv_sec = 0;
rdev->last_read_error.tv_nsec = 0;
@@ -3178,8 +3350,7 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
abort_free:
if (rdev->bdev)
unlock_rdev(rdev);
- free_disk_sb(rdev);
- kfree(rdev->badblocks.page);
+ md_rdev_clear(rdev);
kfree(rdev);
return ERR_PTR(err);
}
@@ -3419,6 +3590,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->raid_disks -= mddev->delta_disks;
mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s would not accept array\n",
mdname(mddev), clevel);
@@ -3492,6 +3664,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
mddev->layout = mddev->new_layout;
mddev->chunk_sectors = mddev->new_chunk_sectors;
mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
mddev->degraded = 0;
if (mddev->pers->sync_request == NULL) {
/* this is now an array without redundancy, so
@@ -3501,10 +3674,8 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
del_timer_sync(&mddev->safemode_timer);
}
pers->run(mddev);
- mddev_resume(mddev);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
- set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
- md_wakeup_thread(mddev->thread);
+ mddev_resume(mddev);
sysfs_notify(&mddev->kobj, NULL, "level");
md_new_event(mddev);
return rv;
@@ -3582,9 +3753,20 @@ raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
if (mddev->pers)
rv = update_raid_disks(mddev, n);
else if (mddev->reshape_position != MaxSector) {
+ struct md_rdev *rdev;
int olddisks = mddev->raid_disks - mddev->delta_disks;
+
+ rdev_for_each(rdev, mddev) {
+ if (olddisks < n &&
+ rdev->data_offset < rdev->new_data_offset)
+ return -EINVAL;
+ if (olddisks > n &&
+ rdev->data_offset > rdev->new_data_offset)
+ return -EINVAL;
+ }
mddev->delta_disks = n - olddisks;
mddev->raid_disks = n;
+ mddev->reshape_backwards = (mddev->delta_disks < 0);
} else
mddev->raid_disks = n;
return rv ? rv : len;
@@ -4266,7 +4448,8 @@ sync_completed_show(struct mddev *mddev, char *page)
if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return sprintf(page, "none\n");
- if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
max_sectors = mddev->resync_max_sectors;
else
max_sectors = mddev->dev_sectors;
@@ -4428,6 +4611,7 @@ reshape_position_show(struct mddev *mddev, char *page)
static ssize_t
reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
{
+ struct md_rdev *rdev;
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
if (mddev->pers)
@@ -4436,9 +4620,12 @@ reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
return -EINVAL;
mddev->reshape_position = new;
mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
+ rdev_for_each(rdev, mddev)
+ rdev->new_data_offset = rdev->data_offset;
return len;
}
@@ -4447,6 +4634,42 @@ __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
reshape_position_store);
static ssize_t
+reshape_direction_show(struct mddev *mddev, char *page)
+{
+ return sprintf(page, "%s\n",
+ mddev->reshape_backwards ? "backwards" : "forwards");
+}
+
+static ssize_t
+reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
+{
+ int backwards = 0;
+ if (cmd_match(buf, "forwards"))
+ backwards = 0;
+ else if (cmd_match(buf, "backwards"))
+ backwards = 1;
+ else
+ return -EINVAL;
+ if (mddev->reshape_backwards == backwards)
+ return len;
+
+ /* check if we are allowed to change */
+ if (mddev->delta_disks)
+ return -EBUSY;
+
+ if (mddev->persistent &&
+ mddev->major_version == 0)
+ return -EINVAL;
+
+ mddev->reshape_backwards = backwards;
+ return len;
+}
+
+static struct md_sysfs_entry md_reshape_direction =
+__ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
+ reshape_direction_store);
+
+static ssize_t
array_size_show(struct mddev *mddev, char *page)
{
if (mddev->external_size)
@@ -4501,6 +4724,7 @@ static struct attribute *md_default_attrs[] = {
&md_safe_delay.attr,
&md_array_state.attr,
&md_reshape_position.attr,
+ &md_reshape_direction.attr,
&md_array_size.attr,
&max_corr_read_errors.attr,
NULL,
@@ -4914,7 +5138,8 @@ int md_run(struct mddev *mddev)
err = -EINVAL;
mddev->pers->stop(mddev);
}
- if (err == 0 && mddev->pers->sync_request) {
+ if (err == 0 && mddev->pers->sync_request &&
+ (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
err = bitmap_create(mddev);
if (err) {
printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
@@ -5064,6 +5289,7 @@ static void md_clean(struct mddev *mddev)
mddev->events = 0;
mddev->can_decrease_events = 0;
mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
mddev->new_level = LEVEL_NONE;
mddev->new_layout = 0;
mddev->new_chunk_sectors = 0;
@@ -5079,6 +5305,7 @@ static void md_clean(struct mddev *mddev)
mddev->merge_check_needed = 0;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.default_offset = 0;
+ mddev->bitmap_info.default_space = 0;
mddev->bitmap_info.chunksize = 0;
mddev->bitmap_info.daemon_sleep = 0;
mddev->bitmap_info.max_write_behind = 0;
@@ -5421,7 +5648,7 @@ static int get_bitmap_file(struct mddev * mddev, void __user * arg)
goto out;
/* bitmap disabled, zero the first byte and copy out */
- if (!mddev->bitmap || !mddev->bitmap->file) {
+ if (!mddev->bitmap || !mddev->bitmap->storage.file) {
file->pathname[0] = '\0';
goto copy_out;
}
@@ -5430,7 +5657,8 @@ static int get_bitmap_file(struct mddev * mddev, void __user * arg)
if (!buf)
goto out;
- ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
+ ptr = d_path(&mddev->bitmap->storage.file->f_path,
+ buf, sizeof(file->pathname));
if (IS_ERR(ptr))
goto out;
@@ -5875,6 +6103,7 @@ static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
set_bit(MD_CHANGE_DEVS, &mddev->flags);
mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
+ mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
mddev->bitmap_info.offset = 0;
mddev->reshape_position = MaxSector;
@@ -5888,6 +6117,7 @@ static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->new_layout = mddev->layout;
mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
return 0;
}
@@ -5922,11 +6152,7 @@ static int update_size(struct mddev *mddev, sector_t num_sectors)
*/
if (mddev->sync_thread)
return -EBUSY;
- if (mddev->bitmap)
- /* Sorry, cannot grow a bitmap yet, just remove it,
- * grow, and re-add.
- */
- return -EBUSY;
+
rdev_for_each(rdev, mddev) {
sector_t avail = rdev->sectors;
@@ -5944,6 +6170,7 @@ static int update_size(struct mddev *mddev, sector_t num_sectors)
static int update_raid_disks(struct mddev *mddev, int raid_disks)
{
int rv;
+ struct md_rdev *rdev;
/* change the number of raid disks */
if (mddev->pers->check_reshape == NULL)
return -EINVAL;
@@ -5952,11 +6179,27 @@ static int update_raid_disks(struct mddev *mddev, int raid_disks)
return -EINVAL;
if (mddev->sync_thread || mddev->reshape_position != MaxSector)
return -EBUSY;
+
+ rdev_for_each(rdev, mddev) {
+ if (mddev->raid_disks < raid_disks &&
+ rdev->data_offset < rdev->new_data_offset)
+ return -EINVAL;
+ if (mddev->raid_disks > raid_disks &&
+ rdev->data_offset > rdev->new_data_offset)
+ return -EINVAL;
+ }
+
mddev->delta_disks = raid_disks - mddev->raid_disks;
+ if (mddev->delta_disks < 0)
+ mddev->reshape_backwards = 1;
+ else if (mddev->delta_disks > 0)
+ mddev->reshape_backwards = 0;
rv = mddev->pers->check_reshape(mddev);
- if (rv < 0)
+ if (rv < 0) {
mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
+ }
return rv;
}
@@ -6039,6 +6282,8 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
return -EINVAL;
mddev->bitmap_info.offset =
mddev->bitmap_info.default_offset;
+ mddev->bitmap_info.space =
+ mddev->bitmap_info.default_space;
mddev->pers->quiesce(mddev, 1);
rv = bitmap_create(mddev);
if (!rv)
@@ -6050,7 +6295,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
/* remove the bitmap */
if (!mddev->bitmap)
return -ENOENT;
- if (mddev->bitmap->file)
+ if (mddev->bitmap->storage.file)
return -EINVAL;
mddev->pers->quiesce(mddev, 1);
bitmap_destroy(mddev);
@@ -6373,6 +6618,9 @@ static int md_open(struct block_device *bdev, fmode_t mode)
struct mddev *mddev = mddev_find(bdev->bd_dev);
int err;
+ if (!mddev)
+ return -ENODEV;
+
if (mddev->gendisk != bdev->bd_disk) {
/* we are racing with mddev_put which is discarding this
* bd_disk.
@@ -6584,7 +6832,8 @@ static void status_resync(struct seq_file *seq, struct mddev * mddev)
resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
- if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
max_sectors = mddev->resync_max_sectors;
else
max_sectors = mddev->dev_sectors;
@@ -7147,7 +7396,7 @@ void md_do_sync(struct mddev *mddev)
j = mddev->recovery_cp;
} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
- max_sectors = mddev->dev_sectors;
+ max_sectors = mddev->resync_max_sectors;
else {
/* recovery follows the physical size of devices */
max_sectors = mddev->dev_sectors;
@@ -7598,7 +7847,7 @@ void md_check_recovery(struct mddev *mddev)
goto unlock;
if (mddev->pers->sync_request) {
- if (spares && mddev->bitmap && ! mddev->bitmap->file) {
+ if (spares) {
/* We are adding a device or devices to an array
* which has the bitmap stored on all devices.
* So make sure all bitmap pages get written
@@ -7646,6 +7895,20 @@ void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
}
EXPORT_SYMBOL(md_wait_for_blocked_rdev);
+void md_finish_reshape(struct mddev *mddev)
+{
+ /* called be personality module when reshape completes. */
+ struct md_rdev *rdev;
+
+ rdev_for_each(rdev, mddev) {
+ if (rdev->data_offset > rdev->new_data_offset)
+ rdev->sectors += rdev->data_offset - rdev->new_data_offset;
+ else
+ rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
+ rdev->data_offset = rdev->new_data_offset;
+ }
+}
+EXPORT_SYMBOL(md_finish_reshape);
/* Bad block management.
* We can record which blocks on each device are 'bad' and so just
@@ -7894,10 +8157,15 @@ static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
}
int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
- int acknowledged)
+ int is_new)
{
- int rv = md_set_badblocks(&rdev->badblocks,
- s + rdev->data_offset, sectors, acknowledged);
+ int rv;
+ if (is_new)
+ s += rdev->new_data_offset;
+ else
+ s += rdev->data_offset;
+ rv = md_set_badblocks(&rdev->badblocks,
+ s, sectors, 0);
if (rv) {
/* Make sure they get written out promptly */
sysfs_notify_dirent_safe(rdev->sysfs_state);
@@ -8003,11 +8271,15 @@ out:
return rv;
}
-int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors)
+int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
+ int is_new)
{
+ if (is_new)
+ s += rdev->new_data_offset;
+ else
+ s += rdev->data_offset;
return md_clear_badblocks(&rdev->badblocks,
- s + rdev->data_offset,
- sectors);
+ s, sectors);
}
EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 1c2063c..7b4a3c3 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -55,6 +55,7 @@ struct md_rdev {
int sb_loaded;
__u64 sb_events;
sector_t data_offset; /* start of data in array */
+ sector_t new_data_offset;/* only relevant while reshaping */
sector_t sb_start; /* offset of the super block (in 512byte sectors) */
int sb_size; /* bytes in the superblock */
int preferred_minor; /* autorun support */
@@ -193,8 +194,9 @@ static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors,
return 0;
}
extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
- int acknowledged);
-extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors);
+ int is_new);
+extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
+ int is_new);
extern void md_ack_all_badblocks(struct badblocks *bb);
struct mddev {
@@ -262,6 +264,7 @@ struct mddev {
sector_t reshape_position;
int delta_disks, new_level, new_layout;
int new_chunk_sectors;
+ int reshape_backwards;
atomic_t plug_cnt; /* If device is expecting
* more bios soon.
@@ -390,10 +393,13 @@ struct mddev {
* For external metadata, offset
* from start of device.
*/
+ unsigned long space; /* space available at this offset */
loff_t default_offset; /* this is the offset to use when
* hot-adding a bitmap. It should
* eventually be settable by sysfs.
*/
+ unsigned long default_space; /* space available at
+ * default offset */
struct mutex mutex;
unsigned long chunksize;
unsigned long daemon_sleep; /* how many jiffies between updates? */
@@ -591,6 +597,7 @@ extern void md_write_start(struct mddev *mddev, struct bio *bi);
extern void md_write_end(struct mddev *mddev);
extern void md_done_sync(struct mddev *mddev, int blocks, int ok);
extern void md_error(struct mddev *mddev, struct md_rdev *rdev);
+extern void md_finish_reshape(struct mddev *mddev);
extern int mddev_congested(struct mddev *mddev, int bits);
extern void md_flush_request(struct mddev *mddev, struct bio *bio);
@@ -615,6 +622,7 @@ extern int md_run(struct mddev *mddev);
extern void md_stop(struct mddev *mddev);
extern void md_stop_writes(struct mddev *mddev);
extern int md_rdev_init(struct md_rdev *rdev);
+extern void md_rdev_clear(struct md_rdev *rdev);
extern void mddev_suspend(struct mddev *mddev);
extern void mddev_resume(struct mddev *mddev);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 15dd59b..835de71 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1859,7 +1859,9 @@ static void fix_read_error(struct r1conf *conf, int read_disk,
rdev = conf->mirrors[d].rdev;
if (rdev &&
- test_bit(In_sync, &rdev->flags) &&
+ (test_bit(In_sync, &rdev->flags) ||
+ (!test_bit(Faulty, &rdev->flags) &&
+ rdev->recovery_offset >= sect + s)) &&
is_badblock(rdev, sect, s,
&first_bad, &bad_sectors) == 0 &&
sync_page_io(rdev, sect, s<<9,
@@ -2024,7 +2026,7 @@ static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio
continue;
if (test_bit(BIO_UPTODATE, &bio->bi_flags) &&
test_bit(R1BIO_MadeGood, &r1_bio->state)) {
- rdev_clear_badblocks(rdev, r1_bio->sector, s);
+ rdev_clear_badblocks(rdev, r1_bio->sector, s, 0);
}
if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
test_bit(R1BIO_WriteError, &r1_bio->state)) {
@@ -2044,7 +2046,7 @@ static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio)
struct md_rdev *rdev = conf->mirrors[m].rdev;
rdev_clear_badblocks(rdev,
r1_bio->sector,
- r1_bio->sectors);
+ r1_bio->sectors, 0);
rdev_dec_pending(rdev, conf->mddev);
} else if (r1_bio->bios[m] != NULL) {
/* This drive got a write error. We need to
@@ -2598,7 +2600,8 @@ static struct r1conf *setup_conf(struct mddev *mddev)
if (!disk->rdev ||
!test_bit(In_sync, &disk->rdev->flags)) {
disk->head_position = 0;
- if (disk->rdev)
+ if (disk->rdev &&
+ (disk->rdev->saved_raid_disk < 0))
conf->fullsync = 1;
} else if (conf->last_used < 0)
/*
@@ -2750,9 +2753,16 @@ static int raid1_resize(struct mddev *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
- md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0));
- if (mddev->array_sectors > raid1_size(mddev, sectors, 0))
+ sector_t newsize = raid1_size(mddev, sectors, 0);
+ if (mddev->external_size &&
+ mddev->array_sectors > newsize)
return -EINVAL;
+ if (mddev->bitmap) {
+ int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0);
+ if (ret)
+ return ret;
+ }
+ md_set_array_sectors(mddev, newsize);
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
if (sectors > mddev->dev_sectors &&
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 3f91c2e..987db37 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -24,6 +24,7 @@
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/ratelimit.h>
+#include <linux/kthread.h>
#include "md.h"
#include "raid10.h"
#include "raid0.h"
@@ -68,6 +69,11 @@ static int max_queued_requests = 1024;
static void allow_barrier(struct r10conf *conf);
static void lower_barrier(struct r10conf *conf);
static int enough(struct r10conf *conf, int ignore);
+static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
+ int *skipped);
+static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio);
+static void end_reshape_write(struct bio *bio, int error);
+static void end_reshape(struct r10conf *conf);
static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
{
@@ -112,7 +118,8 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
if (!r10_bio)
return NULL;
- if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery))
+ if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery) ||
+ test_bit(MD_RECOVERY_RESHAPE, &conf->mddev->recovery))
nalloc = conf->copies; /* resync */
else
nalloc = 2; /* recovery */
@@ -140,9 +147,10 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
struct bio *rbio = r10_bio->devs[j].repl_bio;
bio = r10_bio->devs[j].bio;
for (i = 0; i < RESYNC_PAGES; i++) {
- if (j == 1 && !test_bit(MD_RECOVERY_SYNC,
- &conf->mddev->recovery)) {
- /* we can share bv_page's during recovery */
+ if (j > 0 && !test_bit(MD_RECOVERY_SYNC,
+ &conf->mddev->recovery)) {
+ /* we can share bv_page's during recovery
+ * and reshape */
struct bio *rbio = r10_bio->devs[0].bio;
page = rbio->bi_io_vec[i].bv_page;
get_page(page);
@@ -165,10 +173,11 @@ out_free_pages:
while (j--)
for (i = 0; i < RESYNC_PAGES ; i++)
safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
- j = -1;
+ j = 0;
out_free_bio:
- while (++j < nalloc) {
- bio_put(r10_bio->devs[j].bio);
+ for ( ; j < nalloc; j++) {
+ if (r10_bio->devs[j].bio)
+ bio_put(r10_bio->devs[j].bio);
if (r10_bio->devs[j].repl_bio)
bio_put(r10_bio->devs[j].repl_bio);
}
@@ -504,79 +513,96 @@ static void raid10_end_write_request(struct bio *bio, int error)
* sector offset to a virtual address
*/
-static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio)
+static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio)
{
int n,f;
sector_t sector;
sector_t chunk;
sector_t stripe;
int dev;
-
int slot = 0;
/* now calculate first sector/dev */
- chunk = r10bio->sector >> conf->chunk_shift;
- sector = r10bio->sector & conf->chunk_mask;
+ chunk = r10bio->sector >> geo->chunk_shift;
+ sector = r10bio->sector & geo->chunk_mask;
- chunk *= conf->near_copies;
+ chunk *= geo->near_copies;
stripe = chunk;
- dev = sector_div(stripe, conf->raid_disks);
- if (conf->far_offset)
- stripe *= conf->far_copies;
+ dev = sector_div(stripe, geo->raid_disks);
+ if (geo->far_offset)
+ stripe *= geo->far_copies;
- sector += stripe << conf->chunk_shift;
+ sector += stripe << geo->chunk_shift;
/* and calculate all the others */
- for (n=0; n < conf->near_copies; n++) {
+ for (n = 0; n < geo->near_copies; n++) {
int d = dev;
sector_t s = sector;
r10bio->devs[slot].addr = sector;
r10bio->devs[slot].devnum = d;
slot++;
- for (f = 1; f < conf->far_copies; f++) {
- d += conf->near_copies;
- if (d >= conf->raid_disks)
- d -= conf->raid_disks;
- s += conf->stride;
+ for (f = 1; f < geo->far_copies; f++) {
+ d += geo->near_copies;
+ if (d >= geo->raid_disks)
+ d -= geo->raid_disks;
+ s += geo->stride;
r10bio->devs[slot].devnum = d;
r10bio->devs[slot].addr = s;
slot++;
}
dev++;
- if (dev >= conf->raid_disks) {
+ if (dev >= geo->raid_disks) {
dev = 0;
- sector += (conf->chunk_mask + 1);
+ sector += (geo->chunk_mask + 1);
}
}
- BUG_ON(slot != conf->copies);
+}
+
+static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio)
+{
+ struct geom *geo = &conf->geo;
+
+ if (conf->reshape_progress != MaxSector &&
+ ((r10bio->sector >= conf->reshape_progress) !=
+ conf->mddev->reshape_backwards)) {
+ set_bit(R10BIO_Previous, &r10bio->state);
+ geo = &conf->prev;
+ } else
+ clear_bit(R10BIO_Previous, &r10bio->state);
+
+ __raid10_find_phys(geo, r10bio);
}
static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev)
{
sector_t offset, chunk, vchunk;
+ /* Never use conf->prev as this is only called during resync
+ * or recovery, so reshape isn't happening
+ */
+ struct geom *geo = &conf->geo;
- offset = sector & conf->chunk_mask;
- if (conf->far_offset) {
+ offset = sector & geo->chunk_mask;
+ if (geo->far_offset) {
int fc;
- chunk = sector >> conf->chunk_shift;
- fc = sector_div(chunk, conf->far_copies);
- dev -= fc * conf->near_copies;
+ chunk = sector >> geo->chunk_shift;
+ fc = sector_div(chunk, geo->far_copies);
+ dev -= fc * geo->near_copies;
if (dev < 0)
- dev += conf->raid_disks;
+ dev += geo->raid_disks;
} else {
- while (sector >= conf->stride) {
- sector -= conf->stride;
- if (dev < conf->near_copies)
- dev += conf->raid_disks - conf->near_copies;
+ while (sector >= geo->stride) {
+ sector -= geo->stride;
+ if (dev < geo->near_copies)
+ dev += geo->raid_disks - geo->near_copies;
else
- dev -= conf->near_copies;
+ dev -= geo->near_copies;
}
- chunk = sector >> conf->chunk_shift;
+ chunk = sector >> geo->chunk_shift;
}
- vchunk = chunk * conf->raid_disks + dev;
- sector_div(vchunk, conf->near_copies);
- return (vchunk << conf->chunk_shift) + offset;
+ vchunk = chunk * geo->raid_disks + dev;
+ sector_div(vchunk, geo->near_copies);
+ return (vchunk << geo->chunk_shift) + offset;
}
/**
@@ -597,10 +623,17 @@ static int raid10_mergeable_bvec(struct request_queue *q,
struct r10conf *conf = mddev->private;
sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
int max;
- unsigned int chunk_sectors = mddev->chunk_sectors;
+ unsigned int chunk_sectors;
unsigned int bio_sectors = bvm->bi_size >> 9;
+ struct geom *geo = &conf->geo;
+
+ chunk_sectors = (conf->geo.chunk_mask & conf->prev.chunk_mask) + 1;
+ if (conf->reshape_progress != MaxSector &&
+ ((sector >= conf->reshape_progress) !=
+ conf->mddev->reshape_backwards))
+ geo = &conf->prev;
- if (conf->near_copies < conf->raid_disks) {
+ if (geo->near_copies < geo->raid_disks) {
max = (chunk_sectors - ((sector & (chunk_sectors - 1))
+ bio_sectors)) << 9;
if (max < 0)
@@ -614,6 +647,12 @@ static int raid10_mergeable_bvec(struct request_queue *q,
if (mddev->merge_check_needed) {
struct r10bio r10_bio;
int s;
+ if (conf->reshape_progress != MaxSector) {
+ /* Cannot give any guidance during reshape */
+ if (max <= biovec->bv_len && bio_sectors == 0)
+ return biovec->bv_len;
+ return 0;
+ }
r10_bio.sector = sector;
raid10_find_phys(conf, &r10_bio);
rcu_read_lock();
@@ -681,6 +720,7 @@ static struct md_rdev *read_balance(struct r10conf *conf,
struct md_rdev *rdev, *best_rdev;
int do_balance;
int best_slot;
+ struct geom *geo = &conf->geo;
raid10_find_phys(conf, r10_bio);
rcu_read_lock();
@@ -761,11 +801,11 @@ retry:
* sequential read speed for 'far copies' arrays. So only
* keep it for 'near' arrays, and review those later.
*/
- if (conf->near_copies > 1 && !atomic_read(&rdev->nr_pending))
+ if (geo->near_copies > 1 && !atomic_read(&rdev->nr_pending))
break;
/* for far > 1 always use the lowest address */
- if (conf->far_copies > 1)
+ if (geo->far_copies > 1)
new_distance = r10_bio->devs[slot].addr;
else
new_distance = abs(r10_bio->devs[slot].addr -
@@ -812,7 +852,10 @@ static int raid10_congested(void *data, int bits)
if (mddev_congested(mddev, bits))
return 1;
rcu_read_lock();
- for (i = 0; i < conf->raid_disks && ret == 0; i++) {
+ for (i = 0;
+ (i < conf->geo.raid_disks || i < conf->prev.raid_disks)
+ && ret == 0;
+ i++) {
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags)) {
struct request_queue *q = bdev_get_queue(rdev->bdev);
@@ -973,13 +1016,24 @@ static void unfreeze_array(struct r10conf *conf)
spin_unlock_irq(&conf->resync_lock);
}
+static sector_t choose_data_offset(struct r10bio *r10_bio,
+ struct md_rdev *rdev)
+{
+ if (!test_bit(MD_RECOVERY_RESHAPE, &rdev->mddev->recovery) ||
+ test_bit(R10BIO_Previous, &r10_bio->state))
+ return rdev->data_offset;
+ else
+ return rdev->new_data_offset;
+}
+
static void make_request(struct mddev *mddev, struct bio * bio)
{
struct r10conf *conf = mddev->private;
struct r10bio *r10_bio;
struct bio *read_bio;
int i;
- int chunk_sects = conf->chunk_mask + 1;
+ sector_t chunk_mask = (conf->geo.chunk_mask & conf->prev.chunk_mask);
+ int chunk_sects = chunk_mask + 1;
const int rw = bio_data_dir(bio);
const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
@@ -988,6 +1042,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
int plugged;
int sectors_handled;
int max_sectors;
+ int sectors;
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bio);
@@ -997,9 +1052,10 @@ static void make_request(struct mddev *mddev, struct bio * bio)
/* If this request crosses a chunk boundary, we need to
* split it. This will only happen for 1 PAGE (or less) requests.
*/
- if (unlikely( (bio->bi_sector & conf->chunk_mask) + (bio->bi_size >> 9)
- > chunk_sects &&
- conf->near_copies < conf->raid_disks)) {
+ if (unlikely((bio->bi_sector & chunk_mask) + (bio->bi_size >> 9)
+ > chunk_sects
+ && (conf->geo.near_copies < conf->geo.raid_disks
+ || conf->prev.near_copies < conf->prev.raid_disks))) {
struct bio_pair *bp;
/* Sanity check -- queue functions should prevent this happening */
if (bio->bi_vcnt != 1 ||
@@ -1051,10 +1107,41 @@ static void make_request(struct mddev *mddev, struct bio * bio)
*/
wait_barrier(conf);
+ sectors = bio->bi_size >> 9;
+ while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
+ bio->bi_sector < conf->reshape_progress &&
+ bio->bi_sector + sectors > conf->reshape_progress) {
+ /* IO spans the reshape position. Need to wait for
+ * reshape to pass
+ */
+ allow_barrier(conf);
+ wait_event(conf->wait_barrier,
+ conf->reshape_progress <= bio->bi_sector ||
+ conf->reshape_progress >= bio->bi_sector + sectors);
+ wait_barrier(conf);
+ }
+ if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
+ bio_data_dir(bio) == WRITE &&
+ (mddev->reshape_backwards
+ ? (bio->bi_sector < conf->reshape_safe &&
+ bio->bi_sector + sectors > conf->reshape_progress)
+ : (bio->bi_sector + sectors > conf->reshape_safe &&
+ bio->bi_sector < conf->reshape_progress))) {
+ /* Need to update reshape_position in metadata */
+ mddev->reshape_position = conf->reshape_progress;
+ set_bit(MD_CHANGE_DEVS, &mddev->flags);
+ set_bit(MD_CHANGE_PENDING, &mddev->flags);
+ md_wakeup_thread(mddev->thread);
+ wait_event(mddev->sb_wait,
+ !test_bit(MD_CHANGE_PENDING, &mddev->flags));
+
+ conf->reshape_safe = mddev->reshape_position;
+ }
+
r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
r10_bio->master_bio = bio;
- r10_bio->sectors = bio->bi_size >> 9;
+ r10_bio->sectors = sectors;
r10_bio->mddev = mddev;
r10_bio->sector = bio->bi_sector;
@@ -1093,7 +1180,7 @@ read_again:
r10_bio->devs[slot].rdev = rdev;
read_bio->bi_sector = r10_bio->devs[slot].addr +
- rdev->data_offset;
+ choose_data_offset(r10_bio, rdev);
read_bio->bi_bdev = rdev->bdev;
read_bio->bi_end_io = raid10_end_read_request;
read_bio->bi_rw = READ | do_sync;
@@ -1297,7 +1384,8 @@ retry_write:
r10_bio->devs[i].bio = mbio;
mbio->bi_sector = (r10_bio->devs[i].addr+
- conf->mirrors[d].rdev->data_offset);
+ choose_data_offset(r10_bio,
+ conf->mirrors[d].rdev));
mbio->bi_bdev = conf->mirrors[d].rdev->bdev;
mbio->bi_end_io = raid10_end_write_request;
mbio->bi_rw = WRITE | do_sync | do_fua;
@@ -1321,8 +1409,10 @@ retry_write:
* so it cannot disappear, so the replacement cannot
* become NULL here
*/
- mbio->bi_sector = (r10_bio->devs[i].addr+
- conf->mirrors[d].replacement->data_offset);
+ mbio->bi_sector = (r10_bio->devs[i].addr +
+ choose_data_offset(
+ r10_bio,
+ conf->mirrors[d].replacement));
mbio->bi_bdev = conf->mirrors[d].replacement->bdev;
mbio->bi_end_io = raid10_end_write_request;
mbio->bi_rw = WRITE | do_sync | do_fua;
@@ -1368,19 +1458,19 @@ static void status(struct seq_file *seq, struct mddev *mddev)
struct r10conf *conf = mddev->private;
int i;
- if (conf->near_copies < conf->raid_disks)
+ if (conf->geo.near_copies < conf->geo.raid_disks)
seq_printf(seq, " %dK chunks", mddev->chunk_sectors / 2);
- if (conf->near_copies > 1)
- seq_printf(seq, " %d near-copies", conf->near_copies);
- if (conf->far_copies > 1) {
- if (conf->far_offset)
- seq_printf(seq, " %d offset-copies", conf->far_copies);
+ if (conf->geo.near_copies > 1)
+ seq_printf(seq, " %d near-copies", conf->geo.near_copies);
+ if (conf->geo.far_copies > 1) {
+ if (conf->geo.far_offset)
+ seq_printf(seq, " %d offset-copies", conf->geo.far_copies);
else
- seq_printf(seq, " %d far-copies", conf->far_copies);
+ seq_printf(seq, " %d far-copies", conf->geo.far_copies);
}
- seq_printf(seq, " [%d/%d] [", conf->raid_disks,
- conf->raid_disks - mddev->degraded);
- for (i = 0; i < conf->raid_disks; i++)
+ seq_printf(seq, " [%d/%d] [", conf->geo.raid_disks,
+ conf->geo.raid_disks - mddev->degraded);
+ for (i = 0; i < conf->geo.raid_disks; i++)
seq_printf(seq, "%s",
conf->mirrors[i].rdev &&
test_bit(In_sync, &conf->mirrors[i].rdev->flags) ? "U" : "_");
@@ -1392,7 +1482,7 @@ static void status(struct seq_file *seq, struct mddev *mddev)
* Don't consider the device numbered 'ignore'
* as we might be about to remove it.
*/
-static int enough(struct r10conf *conf, int ignore)
+static int _enough(struct r10conf *conf, struct geom *geo, int ignore)
{
int first = 0;
@@ -1403,7 +1493,7 @@ static int enough(struct r10conf *conf, int ignore)
if (conf->mirrors[first].rdev &&
first != ignore)
cnt++;
- first = (first+1) % conf->raid_disks;
+ first = (first+1) % geo->raid_disks;
}
if (cnt == 0)
return 0;
@@ -1411,6 +1501,12 @@ static int enough(struct r10conf *conf, int ignore)
return 1;
}
+static int enough(struct r10conf *conf, int ignore)
+{
+ return _enough(conf, &conf->geo, ignore) &&
+ _enough(conf, &conf->prev, ignore);
+}
+
static void error(struct mddev *mddev, struct md_rdev *rdev)
{
char b[BDEVNAME_SIZE];
@@ -1445,7 +1541,7 @@ static void error(struct mddev *mddev, struct md_rdev *rdev)
"md/raid10:%s: Disk failure on %s, disabling device.\n"
"md/raid10:%s: Operation continuing on %d devices.\n",
mdname(mddev), bdevname(rdev->bdev, b),
- mdname(mddev), conf->raid_disks - mddev->degraded);
+ mdname(mddev), conf->geo.raid_disks - mddev->degraded);
}
static void print_conf(struct r10conf *conf)
@@ -1458,10 +1554,10 @@ static void print_conf(struct r10conf *conf)
printk(KERN_DEBUG "(!conf)\n");
return;
}
- printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
- conf->raid_disks);
+ printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->geo.raid_disks - conf->mddev->degraded,
+ conf->geo.raid_disks);
- for (i = 0; i < conf->raid_disks; i++) {
+ for (i = 0; i < conf->geo.raid_disks; i++) {
char b[BDEVNAME_SIZE];
tmp = conf->mirrors + i;
if (tmp->rdev)
@@ -1493,7 +1589,7 @@ static int raid10_spare_active(struct mddev *mddev)
* Find all non-in_sync disks within the RAID10 configuration
* and mark them in_sync
*/
- for (i = 0; i < conf->raid_disks; i++) {
+ for (i = 0; i < conf->geo.raid_disks; i++) {
tmp = conf->mirrors + i;
if (tmp->replacement
&& tmp->replacement->recovery_offset == MaxSector
@@ -1535,7 +1631,7 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
int err = -EEXIST;
int mirror;
int first = 0;
- int last = conf->raid_disks - 1;
+ int last = conf->geo.raid_disks - 1;
struct request_queue *q = bdev_get_queue(rdev->bdev);
if (mddev->recovery_cp < MaxSector)
@@ -1543,7 +1639,7 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
* very different from resync
*/
return -EBUSY;
- if (rdev->saved_raid_disk < 0 && !enough(conf, -1))
+ if (rdev->saved_raid_disk < 0 && !_enough(conf, &conf->prev, -1))
return -EINVAL;
if (rdev->raid_disk >= 0)
@@ -1635,6 +1731,7 @@ static int raid10_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
if (!test_bit(Faulty, &rdev->flags) &&
mddev->recovery_disabled != p->recovery_disabled &&
(!p->replacement || p->replacement == rdev) &&
+ number < conf->geo.raid_disks &&
enough(conf, -1)) {
err = -EBUSY;
goto abort;
@@ -1676,7 +1773,11 @@ static void end_sync_read(struct bio *bio, int error)
struct r10conf *conf = r10_bio->mddev->private;
int d;
- d = find_bio_disk(conf, r10_bio, bio, NULL, NULL);
+ if (bio == r10_bio->master_bio) {
+ /* this is a reshape read */
+ d = r10_bio->read_slot; /* really the read dev */
+ } else
+ d = find_bio_disk(conf, r10_bio, bio, NULL, NULL);
if (test_bit(BIO_UPTODATE, &bio->bi_flags))
set_bit(R10BIO_Uptodate, &r10_bio->state);
@@ -2218,7 +2319,9 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(
- sect + rdev->data_offset),
+ sect +
+ choose_data_offset(r10_bio,
+ rdev)),
bdevname(rdev->bdev, b));
printk(KERN_NOTICE "md/raid10:%s: %s: failing "
"drive\n",
@@ -2256,7 +2359,8 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(
- sect + rdev->data_offset),
+ sect +
+ choose_data_offset(r10_bio, rdev)),
bdevname(rdev->bdev, b));
printk(KERN_NOTICE "md/raid10:%s: %s: failing "
"drive\n",
@@ -2269,7 +2373,8 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(
- sect + rdev->data_offset),
+ sect +
+ choose_data_offset(r10_bio, rdev)),
bdevname(rdev->bdev, b));
atomic_add(s, &rdev->corrected_errors);
}
@@ -2343,7 +2448,7 @@ static int narrow_write_error(struct r10bio *r10_bio, int i)
wbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(wbio, sector - bio->bi_sector, sectors);
wbio->bi_sector = (r10_bio->devs[i].addr+
- rdev->data_offset+
+ choose_data_offset(r10_bio, rdev) +
(sector - r10_bio->sector));
wbio->bi_bdev = rdev->bdev;
if (submit_bio_wait(WRITE, wbio) == 0)
@@ -2420,7 +2525,7 @@ read_more:
r10_bio->devs[slot].bio = bio;
r10_bio->devs[slot].rdev = rdev;
bio->bi_sector = r10_bio->devs[slot].addr
- + rdev->data_offset;
+ + choose_data_offset(r10_bio, rdev);
bio->bi_bdev = rdev->bdev;
bio->bi_rw = READ | do_sync;
bio->bi_private = r10_bio;
@@ -2480,7 +2585,7 @@ static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
rdev_clear_badblocks(
rdev,
r10_bio->devs[m].addr,
- r10_bio->sectors);
+ r10_bio->sectors, 0);
} else {
if (!rdev_set_badblocks(
rdev,
@@ -2496,7 +2601,7 @@ static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
rdev_clear_badblocks(
rdev,
r10_bio->devs[m].addr,
- r10_bio->sectors);
+ r10_bio->sectors, 0);
} else {
if (!rdev_set_badblocks(
rdev,
@@ -2515,7 +2620,7 @@ static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
rdev_clear_badblocks(
rdev,
r10_bio->devs[m].addr,
- r10_bio->sectors);
+ r10_bio->sectors, 0);
rdev_dec_pending(rdev, conf->mddev);
} else if (bio != NULL &&
!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
@@ -2532,7 +2637,7 @@ static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
rdev_clear_badblocks(
rdev,
r10_bio->devs[m].addr,
- r10_bio->sectors);
+ r10_bio->sectors, 0);
rdev_dec_pending(rdev, conf->mddev);
}
}
@@ -2573,6 +2678,8 @@ static void raid10d(struct mddev *mddev)
if (test_bit(R10BIO_MadeGood, &r10_bio->state) ||
test_bit(R10BIO_WriteError, &r10_bio->state))
handle_write_completed(conf, r10_bio);
+ else if (test_bit(R10BIO_IsReshape, &r10_bio->state))
+ reshape_request_write(mddev, r10_bio);
else if (test_bit(R10BIO_IsSync, &r10_bio->state))
sync_request_write(mddev, r10_bio);
else if (test_bit(R10BIO_IsRecover, &r10_bio->state))
@@ -2603,7 +2710,7 @@ static int init_resync(struct r10conf *conf)
buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE;
BUG_ON(conf->r10buf_pool);
conf->have_replacement = 0;
- for (i = 0; i < conf->raid_disks; i++)
+ for (i = 0; i < conf->geo.raid_disks; i++)
if (conf->mirrors[i].replacement)
conf->have_replacement = 1;
conf->r10buf_pool = mempool_create(buffs, r10buf_pool_alloc, r10buf_pool_free, conf);
@@ -2657,6 +2764,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
sector_t sync_blocks;
sector_t sectors_skipped = 0;
int chunks_skipped = 0;
+ sector_t chunk_mask = conf->geo.chunk_mask;
if (!conf->r10buf_pool)
if (init_resync(conf))
@@ -2664,7 +2772,8 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
skipped:
max_sector = mddev->dev_sectors;
- if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
max_sector = mddev->resync_max_sectors;
if (sector_nr >= max_sector) {
/* If we aborted, we need to abort the
@@ -2676,11 +2785,16 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
* we need to convert that to several
* virtual addresses.
*/
+ if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
+ end_reshape(conf);
+ return 0;
+ }
+
if (mddev->curr_resync < max_sector) { /* aborted */
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
&sync_blocks, 1);
- else for (i=0; i<conf->raid_disks; i++) {
+ else for (i = 0; i < conf->geo.raid_disks; i++) {
sector_t sect =
raid10_find_virt(conf, mddev->curr_resync, i);
bitmap_end_sync(mddev->bitmap, sect,
@@ -2694,7 +2808,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
/* Completed a full sync so the replacements
* are now fully recovered.
*/
- for (i = 0; i < conf->raid_disks; i++)
+ for (i = 0; i < conf->geo.raid_disks; i++)
if (conf->mirrors[i].replacement)
conf->mirrors[i].replacement
->recovery_offset
@@ -2707,7 +2821,11 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
*skipped = 1;
return sectors_skipped;
}
- if (chunks_skipped >= conf->raid_disks) {
+
+ if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
+ return reshape_request(mddev, sector_nr, skipped);
+
+ if (chunks_skipped >= conf->geo.raid_disks) {
/* if there has been nothing to do on any drive,
* then there is nothing to do at all..
*/
@@ -2721,9 +2839,9 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
/* make sure whole request will fit in a chunk - if chunks
* are meaningful
*/
- if (conf->near_copies < conf->raid_disks &&
- max_sector > (sector_nr | conf->chunk_mask))
- max_sector = (sector_nr | conf->chunk_mask) + 1;
+ if (conf->geo.near_copies < conf->geo.raid_disks &&
+ max_sector > (sector_nr | chunk_mask))
+ max_sector = (sector_nr | chunk_mask) + 1;
/*
* If there is non-resync activity waiting for us then
* put in a delay to throttle resync.
@@ -2752,7 +2870,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
int j;
r10_bio = NULL;
- for (i=0 ; i<conf->raid_disks; i++) {
+ for (i = 0 ; i < conf->geo.raid_disks; i++) {
int still_degraded;
struct r10bio *rb2;
sector_t sect;
@@ -2806,7 +2924,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
/* Need to check if the array will still be
* degraded
*/
- for (j=0; j<conf->raid_disks; j++)
+ for (j = 0; j < conf->geo.raid_disks; j++)
if (conf->mirrors[j].rdev == NULL ||
test_bit(Faulty, &conf->mirrors[j].rdev->flags)) {
still_degraded = 1;
@@ -2984,9 +3102,9 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
r10_bio->sector = sector_nr;
set_bit(R10BIO_IsSync, &r10_bio->state);
raid10_find_phys(conf, r10_bio);
- r10_bio->sectors = (sector_nr | conf->chunk_mask) - sector_nr +1;
+ r10_bio->sectors = (sector_nr | chunk_mask) - sector_nr + 1;
- for (i=0; i<conf->copies; i++) {
+ for (i = 0; i < conf->copies; i++) {
int d = r10_bio->devs[i].devnum;
sector_t first_bad, sector;
int bad_sectors;
@@ -3152,16 +3270,17 @@ raid10_size(struct mddev *mddev, sector_t sectors, int raid_disks)
struct r10conf *conf = mddev->private;
if (!raid_disks)
- raid_disks = conf->raid_disks;
+ raid_disks = min(conf->geo.raid_disks,
+ conf->prev.raid_disks);
if (!sectors)
sectors = conf->dev_sectors;
- size = sectors >> conf->chunk_shift;
- sector_div(size, conf->far_copies);
+ size = sectors >> conf->geo.chunk_shift;
+ sector_div(size, conf->geo.far_copies);
size = size * raid_disks;
- sector_div(size, conf->near_copies);
+ sector_div(size, conf->geo.near_copies);
- return size << conf->chunk_shift;
+ return size << conf->geo.chunk_shift;
}
static void calc_sectors(struct r10conf *conf, sector_t size)
@@ -3171,10 +3290,10 @@ static void calc_sectors(struct r10conf *conf, sector_t size)
* conf->stride
*/
- size = size >> conf->chunk_shift;
- sector_div(size, conf->far_copies);
- size = size * conf->raid_disks;
- sector_div(size, conf->near_copies);
+ size = size >> conf->geo.chunk_shift;
+ sector_div(size, conf->geo.far_copies);
+ size = size * conf->geo.raid_disks;
+ sector_div(size, conf->geo.near_copies);
/* 'size' is now the number of chunks in the array */
/* calculate "used chunks per device" */
size = size * conf->copies;
@@ -3182,38 +3301,76 @@ static void calc_sectors(struct r10conf *conf, sector_t size)
/* We need to round up when dividing by raid_disks to
* get the stride size.
*/
- size = DIV_ROUND_UP_SECTOR_T(size, conf->raid_disks);
+ size = DIV_ROUND_UP_SECTOR_T(size, conf->geo.raid_disks);
- conf->dev_sectors = size << conf->chunk_shift;
+ conf->dev_sectors = size << conf->geo.chunk_shift;
- if (conf->far_offset)
- conf->stride = 1 << conf->chunk_shift;
+ if (conf->geo.far_offset)
+ conf->geo.stride = 1 << conf->geo.chunk_shift;
else {
- sector_div(size, conf->far_copies);
- conf->stride = size << conf->chunk_shift;
+ sector_div(size, conf->geo.far_copies);
+ conf->geo.stride = size << conf->geo.chunk_shift;
}
}
+enum geo_type {geo_new, geo_old, geo_start};
+static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new)
+{
+ int nc, fc, fo;
+ int layout, chunk, disks;
+ switch (new) {
+ case geo_old:
+ layout = mddev->layout;
+ chunk = mddev->chunk_sectors;
+ disks = mddev->raid_disks - mddev->delta_disks;
+ break;
+ case geo_new:
+ layout = mddev->new_layout;
+ chunk = mddev->new_chunk_sectors;
+ disks = mddev->raid_disks;
+ break;
+ default: /* avoid 'may be unused' warnings */
+ case geo_start: /* new when starting reshape - raid_disks not
+ * updated yet. */
+ layout = mddev->new_layout;
+ chunk = mddev->new_chunk_sectors;
+ disks = mddev->raid_disks + mddev->delta_disks;
+ break;
+ }
+ if (layout >> 17)
+ return -1;
+ if (chunk < (PAGE_SIZE >> 9) ||
+ !is_power_of_2(chunk))
+ return -2;
+ nc = layout & 255;
+ fc = (layout >> 8) & 255;
+ fo = layout & (1<<16);
+ geo->raid_disks = disks;
+ geo->near_copies = nc;
+ geo->far_copies = fc;
+ geo->far_offset = fo;
+ geo->chunk_mask = chunk - 1;
+ geo->chunk_shift = ffz(~chunk);
+ return nc*fc;
+}
+
static struct r10conf *setup_conf(struct mddev *mddev)
{
struct r10conf *conf = NULL;
- int nc, fc, fo;
int err = -EINVAL;
+ struct geom geo;
+ int copies;
+
+ copies = setup_geo(&geo, mddev, geo_new);
- if (mddev->new_chunk_sectors < (PAGE_SIZE >> 9) ||
- !is_power_of_2(mddev->new_chunk_sectors)) {
+ if (copies == -2) {
printk(KERN_ERR "md/raid10:%s: chunk size must be "
"at least PAGE_SIZE(%ld) and be a power of 2.\n",
mdname(mddev), PAGE_SIZE);
goto out;
}
- nc = mddev->new_layout & 255;
- fc = (mddev->new_layout >> 8) & 255;
- fo = mddev->new_layout & (1<<16);
-
- if ((nc*fc) <2 || (nc*fc) > mddev->raid_disks ||
- (mddev->new_layout >> 17)) {
+ if (copies < 2 || copies > mddev->raid_disks) {
printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n",
mdname(mddev), mddev->new_layout);
goto out;
@@ -3224,7 +3381,9 @@ static struct r10conf *setup_conf(struct mddev *mddev)
if (!conf)
goto out;
- conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks,
+ /* FIXME calc properly */
+ conf->mirrors = kzalloc(sizeof(struct mirror_info)*(mddev->raid_disks +
+ max(0,mddev->delta_disks)),
GFP_KERNEL);
if (!conf->mirrors)
goto out;
@@ -3233,22 +3392,29 @@ static struct r10conf *setup_conf(struct mddev *mddev)
if (!conf->tmppage)
goto out;
-
- conf->raid_disks = mddev->raid_disks;
- conf->near_copies = nc;
- conf->far_copies = fc;
- conf->copies = nc*fc;
- conf->far_offset = fo;
- conf->chunk_mask = mddev->new_chunk_sectors - 1;
- conf->chunk_shift = ffz(~mddev->new_chunk_sectors);
-
+ conf->geo = geo;
+ conf->copies = copies;
conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
r10bio_pool_free, conf);
if (!conf->r10bio_pool)
goto out;
calc_sectors(conf, mddev->dev_sectors);
-
+ if (mddev->reshape_position == MaxSector) {
+ conf->prev = conf->geo;
+ conf->reshape_progress = MaxSector;
+ } else {
+ if (setup_geo(&conf->prev, mddev, geo_old) != conf->copies) {
+ err = -EINVAL;
+ goto out;
+ }
+ conf->reshape_progress = mddev->reshape_position;
+ if (conf->prev.far_offset)
+ conf->prev.stride = 1 << conf->prev.chunk_shift;
+ else
+ /* far_copies must be 1 */
+ conf->prev.stride = conf->dev_sectors;
+ }
spin_lock_init(&conf->device_lock);
INIT_LIST_HEAD(&conf->retry_list);
@@ -3263,8 +3429,9 @@ static struct r10conf *setup_conf(struct mddev *mddev)
return conf;
out:
- printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n",
- mdname(mddev));
+ if (err == -ENOMEM)
+ printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n",
+ mdname(mddev));
if (conf) {
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
@@ -3282,12 +3449,8 @@ static int run(struct mddev *mddev)
struct mirror_info *disk;
struct md_rdev *rdev;
sector_t size;
-
- /*
- * copy the already verified devices into our private RAID10
- * bookkeeping area. [whatever we allocate in run(),
- * should be freed in stop()]
- */
+ sector_t min_offset_diff = 0;
+ int first = 1;
if (mddev->private == NULL) {
conf = setup_conf(mddev);
@@ -3304,17 +3467,20 @@ static int run(struct mddev *mddev)
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
- if (conf->raid_disks % conf->near_copies)
- blk_queue_io_opt(mddev->queue, chunk_size * conf->raid_disks);
+ if (conf->geo.raid_disks % conf->geo.near_copies)
+ blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);
else
blk_queue_io_opt(mddev->queue, chunk_size *
- (conf->raid_disks / conf->near_copies));
+ (conf->geo.raid_disks / conf->geo.near_copies));
rdev_for_each(rdev, mddev) {
+ long long diff;
disk_idx = rdev->raid_disk;
- if (disk_idx >= conf->raid_disks
- || disk_idx < 0)
+ if (disk_idx < 0)
+ continue;
+ if (disk_idx >= conf->geo.raid_disks &&
+ disk_idx >= conf->prev.raid_disks)
continue;
disk = conf->mirrors + disk_idx;
@@ -3327,12 +3493,20 @@ static int run(struct mddev *mddev)
goto out_free_conf;
disk->rdev = rdev;
}
+ diff = (rdev->new_data_offset - rdev->data_offset);
+ if (!mddev->reshape_backwards)
+ diff = -diff;
+ if (diff < 0)
+ diff = 0;
+ if (first || diff < min_offset_diff)
+ min_offset_diff = diff;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
disk->head_position = 0;
}
+
/* need to check that every block has at least one working mirror */
if (!enough(conf, -1)) {
printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n",
@@ -3340,8 +3514,21 @@ static int run(struct mddev *mddev)
goto out_free_conf;
}
+ if (conf->reshape_progress != MaxSector) {
+ /* must ensure that shape change is supported */
+ if (conf->geo.far_copies != 1 &&
+ conf->geo.far_offset == 0)
+ goto out_free_conf;
+ if (conf->prev.far_copies != 1 &&
+ conf->geo.far_offset == 0)
+ goto out_free_conf;
+ }
+
mddev->degraded = 0;
- for (i = 0; i < conf->raid_disks; i++) {
+ for (i = 0;
+ i < conf->geo.raid_disks
+ || i < conf->prev.raid_disks;
+ i++) {
disk = conf->mirrors + i;
@@ -3368,8 +3555,8 @@ static int run(struct mddev *mddev)
mdname(mddev));
printk(KERN_INFO
"md/raid10:%s: active with %d out of %d devices\n",
- mdname(mddev), conf->raid_disks - mddev->degraded,
- conf->raid_disks);
+ mdname(mddev), conf->geo.raid_disks - mddev->degraded,
+ conf->geo.raid_disks);
/*
* Ok, everything is just fine now
*/
@@ -3386,11 +3573,11 @@ static int run(struct mddev *mddev)
* maybe...
*/
{
- int stripe = conf->raid_disks *
+ int stripe = conf->geo.raid_disks *
((mddev->chunk_sectors << 9) / PAGE_SIZE);
- stripe /= conf->near_copies;
- if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
- mddev->queue->backing_dev_info.ra_pages = 2* stripe;
+ stripe /= conf->geo.near_copies;
+ if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
+ mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
}
blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
@@ -3398,6 +3585,30 @@ static int run(struct mddev *mddev)
if (md_integrity_register(mddev))
goto out_free_conf;
+ if (conf->reshape_progress != MaxSector) {
+ unsigned long before_length, after_length;
+
+ before_length = ((1 << conf->prev.chunk_shift) *
+ conf->prev.far_copies);
+ after_length = ((1 << conf->geo.chunk_shift) *
+ conf->geo.far_copies);
+
+ if (max(before_length, after_length) > min_offset_diff) {
+ /* This cannot work */
+ printk("md/raid10: offset difference not enough to continue reshape\n");
+ goto out_free_conf;
+ }
+ conf->offset_diff = min_offset_diff;
+
+ conf->reshape_safe = conf->reshape_progress;
+ clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+ set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
+ set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
+ mddev->sync_thread = md_register_thread(md_do_sync, mddev,
+ "reshape");
+ }
+
return 0;
out_free_conf:
@@ -3460,14 +3671,23 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
struct r10conf *conf = mddev->private;
sector_t oldsize, size;
- if (conf->far_copies > 1 && !conf->far_offset)
+ if (mddev->reshape_position != MaxSector)
+ return -EBUSY;
+
+ if (conf->geo.far_copies > 1 && !conf->geo.far_offset)
return -EINVAL;
oldsize = raid10_size(mddev, 0, 0);
size = raid10_size(mddev, sectors, 0);
- md_set_array_sectors(mddev, size);
- if (mddev->array_sectors > size)
+ if (mddev->external_size &&
+ mddev->array_sectors > size)
return -EINVAL;
+ if (mddev->bitmap) {
+ int ret = bitmap_resize(mddev->bitmap, size, 0, 0);
+ if (ret)
+ return ret;
+ }
+ md_set_array_sectors(mddev, size);
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
if (sectors > mddev->dev_sectors &&
@@ -3534,6 +3754,758 @@ static void *raid10_takeover(struct mddev *mddev)
return ERR_PTR(-EINVAL);
}
+static int raid10_check_reshape(struct mddev *mddev)
+{
+ /* Called when there is a request to change
+ * - layout (to ->new_layout)
+ * - chunk size (to ->new_chunk_sectors)
+ * - raid_disks (by delta_disks)
+ * or when trying to restart a reshape that was ongoing.
+ *
+ * We need to validate the request and possibly allocate
+ * space if that might be an issue later.
+ *
+ * Currently we reject any reshape of a 'far' mode array,
+ * allow chunk size to change if new is generally acceptable,
+ * allow raid_disks to increase, and allow
+ * a switch between 'near' mode and 'offset' mode.
+ */
+ struct r10conf *conf = mddev->private;
+ struct geom geo;
+
+ if (conf->geo.far_copies != 1 && !conf->geo.far_offset)
+ return -EINVAL;
+
+ if (setup_geo(&geo, mddev, geo_start) != conf->copies)
+ /* mustn't change number of copies */
+ return -EINVAL;
+ if (geo.far_copies > 1 && !geo.far_offset)
+ /* Cannot switch to 'far' mode */
+ return -EINVAL;
+
+ if (mddev->array_sectors & geo.chunk_mask)
+ /* not factor of array size */
+ return -EINVAL;
+
+ if (!enough(conf, -1))
+ return -EINVAL;
+
+ kfree(conf->mirrors_new);
+ conf->mirrors_new = NULL;
+ if (mddev->delta_disks > 0) {
+ /* allocate new 'mirrors' list */
+ conf->mirrors_new = kzalloc(
+ sizeof(struct mirror_info)
+ *(mddev->raid_disks +
+ mddev->delta_disks),
+ GFP_KERNEL);
+ if (!conf->mirrors_new)
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+/*
+ * Need to check if array has failed when deciding whether to:
+ * - start an array
+ * - remove non-faulty devices
+ * - add a spare
+ * - allow a reshape
+ * This determination is simple when no reshape is happening.
+ * However if there is a reshape, we need to carefully check
+ * both the before and after sections.
+ * This is because some failed devices may only affect one
+ * of the two sections, and some non-in_sync devices may
+ * be insync in the section most affected by failed devices.
+ */
+static int calc_degraded(struct r10conf *conf)
+{
+ int degraded, degraded2;
+ int i;
+
+ rcu_read_lock();
+ degraded = 0;
+ /* 'prev' section first */
+ for (i = 0; i < conf->prev.raid_disks; i++) {
+ struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
+ if (!rdev || test_bit(Faulty, &rdev->flags))
+ degraded++;
+ else if (!test_bit(In_sync, &rdev->flags))
+ /* When we can reduce the number of devices in
+ * an array, this might not contribute to
+ * 'degraded'. It does now.
+ */
+ degraded++;
+ }
+ rcu_read_unlock();
+ if (conf->geo.raid_disks == conf->prev.raid_disks)
+ return degraded;
+ rcu_read_lock();
+ degraded2 = 0;
+ for (i = 0; i < conf->geo.raid_disks; i++) {
+ struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
+ if (!rdev || test_bit(Faulty, &rdev->flags))
+ degraded2++;
+ else if (!test_bit(In_sync, &rdev->flags)) {
+ /* If reshape is increasing the number of devices,
+ * this section has already been recovered, so
+ * it doesn't contribute to degraded.
+ * else it does.
+ */
+ if (conf->geo.raid_disks <= conf->prev.raid_disks)
+ degraded2++;
+ }
+ }
+ rcu_read_unlock();
+ if (degraded2 > degraded)
+ return degraded2;
+ return degraded;
+}
+
+static int raid10_start_reshape(struct mddev *mddev)
+{
+ /* A 'reshape' has been requested. This commits
+ * the various 'new' fields and sets MD_RECOVER_RESHAPE
+ * This also checks if there are enough spares and adds them
+ * to the array.
+ * We currently require enough spares to make the final
+ * array non-degraded. We also require that the difference
+ * between old and new data_offset - on each device - is
+ * enough that we never risk over-writing.
+ */
+
+ unsigned long before_length, after_length;
+ sector_t min_offset_diff = 0;
+ int first = 1;
+ struct geom new;
+ struct r10conf *conf = mddev->private;
+ struct md_rdev *rdev;
+ int spares = 0;
+ int ret;
+
+ if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
+ return -EBUSY;
+
+ if (setup_geo(&new, mddev, geo_start) != conf->copies)
+ return -EINVAL;
+
+ before_length = ((1 << conf->prev.chunk_shift) *
+ conf->prev.far_copies);
+ after_length = ((1 << conf->geo.chunk_shift) *
+ conf->geo.far_copies);
+
+ rdev_for_each(rdev, mddev) {
+ if (!test_bit(In_sync, &rdev->flags)
+ && !test_bit(Faulty, &rdev->flags))
+ spares++;
+ if (rdev->raid_disk >= 0) {
+ long long diff = (rdev->new_data_offset
+ - rdev->data_offset);
+ if (!mddev->reshape_backwards)
+ diff = -diff;
+ if (diff < 0)
+ diff = 0;
+ if (first || diff < min_offset_diff)
+ min_offset_diff = diff;
+ }
+ }
+
+ if (max(before_length, after_length) > min_offset_diff)
+ return -EINVAL;
+
+ if (spares < mddev->delta_disks)
+ return -EINVAL;
+
+ conf->offset_diff = min_offset_diff;
+ spin_lock_irq(&conf->device_lock);
+ if (conf->mirrors_new) {
+ memcpy(conf->mirrors_new, conf->mirrors,
+ sizeof(struct mirror_info)*conf->prev.raid_disks);
+ smp_mb();
+ kfree(conf->mirrors_old); /* FIXME and elsewhere */
+ conf->mirrors_old = conf->mirrors;
+ conf->mirrors = conf->mirrors_new;
+ conf->mirrors_new = NULL;
+ }
+ setup_geo(&conf->geo, mddev, geo_start);
+ smp_mb();
+ if (mddev->reshape_backwards) {
+ sector_t size = raid10_size(mddev, 0, 0);
+ if (size < mddev->array_sectors) {
+ spin_unlock_irq(&conf->device_lock);
+ printk(KERN_ERR "md/raid10:%s: array size must be reduce before number of disks\n",
+ mdname(mddev));
+ return -EINVAL;
+ }
+ mddev->resync_max_sectors = size;
+ conf->reshape_progress = size;
+ } else
+ conf->reshape_progress = 0;
+ spin_unlock_irq(&conf->device_lock);
+
+ if (mddev->delta_disks && mddev->bitmap) {
+ ret = bitmap_resize(mddev->bitmap,
+ raid10_size(mddev, 0,
+ conf->geo.raid_disks),
+ 0, 0);
+ if (ret)
+ goto abort;
+ }
+ if (mddev->delta_disks > 0) {
+ rdev_for_each(rdev, mddev)
+ if (rdev->raid_disk < 0 &&
+ !test_bit(Faulty, &rdev->flags)) {
+ if (raid10_add_disk(mddev, rdev) == 0) {
+ if (rdev->raid_disk >=
+ conf->prev.raid_disks)
+ set_bit(In_sync, &rdev->flags);
+ else
+ rdev->recovery_offset = 0;
+
+ if (sysfs_link_rdev(mddev, rdev))
+ /* Failure here is OK */;
+ }
+ } else if (rdev->raid_disk >= conf->prev.raid_disks
+ && !test_bit(Faulty, &rdev->flags)) {
+ /* This is a spare that was manually added */
+ set_bit(In_sync, &rdev->flags);
+ }
+ }
+ /* When a reshape changes the number of devices,
+ * ->degraded is measured against the larger of the
+ * pre and post numbers.
+ */
+ spin_lock_irq(&conf->device_lock);
+ mddev->degraded = calc_degraded(conf);
+ spin_unlock_irq(&conf->device_lock);
+ mddev->raid_disks = conf->geo.raid_disks;
+ mddev->reshape_position = conf->reshape_progress;
+ set_bit(MD_CHANGE_DEVS, &mddev->flags);
+
+ clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+ set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
+ set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
+
+ mddev->sync_thread = md_register_thread(md_do_sync, mddev,
+ "reshape");
+ if (!mddev->sync_thread) {
+ ret = -EAGAIN;
+ goto abort;
+ }
+ conf->reshape_checkpoint = jiffies;
+ md_wakeup_thread(mddev->sync_thread);
+ md_new_event(mddev);
+ return 0;
+
+abort:
+ mddev->recovery = 0;
+ spin_lock_irq(&conf->device_lock);
+ conf->geo = conf->prev;
+ mddev->raid_disks = conf->geo.raid_disks;
+ rdev_for_each(rdev, mddev)
+ rdev->new_data_offset = rdev->data_offset;
+ smp_wmb();
+ conf->reshape_progress = MaxSector;
+ mddev->reshape_position = MaxSector;
+ spin_unlock_irq(&conf->device_lock);
+ return ret;
+}
+
+/* Calculate the last device-address that could contain
+ * any block from the chunk that includes the array-address 's'
+ * and report the next address.
+ * i.e. the address returned will be chunk-aligned and after
+ * any data that is in the chunk containing 's'.
+ */
+static sector_t last_dev_address(sector_t s, struct geom *geo)
+{
+ s = (s | geo->chunk_mask) + 1;
+ s >>= geo->chunk_shift;
+ s *= geo->near_copies;
+ s = DIV_ROUND_UP_SECTOR_T(s, geo->raid_disks);
+ s *= geo->far_copies;
+ s <<= geo->chunk_shift;
+ return s;
+}
+
+/* Calculate the first device-address that could contain
+ * any block from the chunk that includes the array-address 's'.
+ * This too will be the start of a chunk
+ */
+static sector_t first_dev_address(sector_t s, struct geom *geo)
+{
+ s >>= geo->chunk_shift;
+ s *= geo->near_copies;
+ sector_div(s, geo->raid_disks);
+ s *= geo->far_copies;
+ s <<= geo->chunk_shift;
+ return s;
+}
+
+static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
+ int *skipped)
+{
+ /* We simply copy at most one chunk (smallest of old and new)
+ * at a time, possibly less if that exceeds RESYNC_PAGES,
+ * or we hit a bad block or something.
+ * This might mean we pause for normal IO in the middle of
+ * a chunk, but that is not a problem was mddev->reshape_position
+ * can record any location.
+ *
+ * If we will want to write to a location that isn't
+ * yet recorded as 'safe' (i.e. in metadata on disk) then
+ * we need to flush all reshape requests and update the metadata.
+ *
+ * When reshaping forwards (e.g. to more devices), we interpret
+ * 'safe' as the earliest block which might not have been copied
+ * down yet. We divide this by previous stripe size and multiply
+ * by previous stripe length to get lowest device offset that we
+ * cannot write to yet.
+ * We interpret 'sector_nr' as an address that we want to write to.
+ * From this we use last_device_address() to find where we might
+ * write to, and first_device_address on the 'safe' position.
+ * If this 'next' write position is after the 'safe' position,
+ * we must update the metadata to increase the 'safe' position.
+ *
+ * When reshaping backwards, we round in the opposite direction
+ * and perform the reverse test: next write position must not be
+ * less than current safe position.
+ *
+ * In all this the minimum difference in data offsets
+ * (conf->offset_diff - always positive) allows a bit of slack,
+ * so next can be after 'safe', but not by more than offset_disk
+ *
+ * We need to prepare all the bios here before we start any IO
+ * to ensure the size we choose is acceptable to all devices.
+ * The means one for each copy for write-out and an extra one for
+ * read-in.
+ * We store the read-in bio in ->master_bio and the others in
+ * ->devs[x].bio and ->devs[x].repl_bio.
+ */
+ struct r10conf *conf = mddev->private;
+ struct r10bio *r10_bio;
+ sector_t next, safe, last;
+ int max_sectors;
+ int nr_sectors;
+ int s;
+ struct md_rdev *rdev;
+ int need_flush = 0;
+ struct bio *blist;
+ struct bio *bio, *read_bio;
+ int sectors_done = 0;
+
+ if (sector_nr == 0) {
+ /* If restarting in the middle, skip the initial sectors */
+ if (mddev->reshape_backwards &&
+ conf->reshape_progress < raid10_size(mddev, 0, 0)) {
+ sector_nr = (raid10_size(mddev, 0, 0)
+ - conf->reshape_progress);
+ } else if (!mddev->reshape_backwards &&
+ conf->reshape_progress > 0)
+ sector_nr = conf->reshape_progress;
+ if (sector_nr) {
+ mddev->curr_resync_completed = sector_nr;
+ sysfs_notify(&mddev->kobj, NULL, "sync_completed");
+ *skipped = 1;
+ return sector_nr;
+ }
+ }
+
+ /* We don't use sector_nr to track where we are up to
+ * as that doesn't work well for ->reshape_backwards.
+ * So just use ->reshape_progress.
+ */
+ if (mddev->reshape_backwards) {
+ /* 'next' is the earliest device address that we might
+ * write to for this chunk in the new layout
+ */
+ next = first_dev_address(conf->reshape_progress - 1,
+ &conf->geo);
+
+ /* 'safe' is the last device address that we might read from
+ * in the old layout after a restart
+ */
+ safe = last_dev_address(conf->reshape_safe - 1,
+ &conf->prev);
+
+ if (next + conf->offset_diff < safe)
+ need_flush = 1;
+
+ last = conf->reshape_progress - 1;
+ sector_nr = last & ~(sector_t)(conf->geo.chunk_mask
+ & conf->prev.chunk_mask);
+ if (sector_nr + RESYNC_BLOCK_SIZE/512 < last)
+ sector_nr = last + 1 - RESYNC_BLOCK_SIZE/512;
+ } else {
+ /* 'next' is after the last device address that we
+ * might write to for this chunk in the new layout
+ */
+ next = last_dev_address(conf->reshape_progress, &conf->geo);
+
+ /* 'safe' is the earliest device address that we might
+ * read from in the old layout after a restart
+ */
+ safe = first_dev_address(conf->reshape_safe, &conf->prev);
+
+ /* Need to update metadata if 'next' might be beyond 'safe'
+ * as that would possibly corrupt data
+ */
+ if (next > safe + conf->offset_diff)
+ need_flush = 1;
+
+ sector_nr = conf->reshape_progress;
+ last = sector_nr | (conf->geo.chunk_mask
+ & conf->prev.chunk_mask);
+
+ if (sector_nr + RESYNC_BLOCK_SIZE/512 <= last)
+ last = sector_nr + RESYNC_BLOCK_SIZE/512 - 1;
+ }
+
+ if (need_flush ||
+ time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) {
+ /* Need to update reshape_position in metadata */
+ wait_barrier(conf);
+ mddev->reshape_position = conf->reshape_progress;
+ if (mddev->reshape_backwards)
+ mddev->curr_resync_completed = raid10_size(mddev, 0, 0)
+ - conf->reshape_progress;
+ else
+ mddev->curr_resync_completed = conf->reshape_progress;
+ conf->reshape_checkpoint = jiffies;
+ set_bit(MD_CHANGE_DEVS, &mddev->flags);
+ md_wakeup_thread(mddev->thread);
+ wait_event(mddev->sb_wait, mddev->flags == 0 ||
+ kthread_should_stop());
+ conf->reshape_safe = mddev->reshape_position;
+ allow_barrier(conf);
+ }
+
+read_more:
+ /* Now schedule reads for blocks from sector_nr to last */
+ r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
+ raise_barrier(conf, sectors_done != 0);
+ atomic_set(&r10_bio->remaining, 0);
+ r10_bio->mddev = mddev;
+ r10_bio->sector = sector_nr;
+ set_bit(R10BIO_IsReshape, &r10_bio->state);
+ r10_bio->sectors = last - sector_nr + 1;
+ rdev = read_balance(conf, r10_bio, &max_sectors);
+ BUG_ON(!test_bit(R10BIO_Previous, &r10_bio->state));
+
+ if (!rdev) {
+ /* Cannot read from here, so need to record bad blocks
+ * on all the target devices.
+ */
+ // FIXME
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ return sectors_done;
+ }
+
+ read_bio = bio_alloc_mddev(GFP_KERNEL, RESYNC_PAGES, mddev);
+
+ read_bio->bi_bdev = rdev->bdev;
+ read_bio->bi_sector = (r10_bio->devs[r10_bio->read_slot].addr
+ + rdev->data_offset);
+ read_bio->bi_private = r10_bio;
+ read_bio->bi_end_io = end_sync_read;
+ read_bio->bi_rw = READ;
+ read_bio->bi_flags &= ~(BIO_POOL_MASK - 1);
+ read_bio->bi_flags |= 1 << BIO_UPTODATE;
+ read_bio->bi_vcnt = 0;
+ read_bio->bi_idx = 0;
+ read_bio->bi_size = 0;
+ r10_bio->master_bio = read_bio;
+ r10_bio->read_slot = r10_bio->devs[r10_bio->read_slot].devnum;
+
+ /* Now find the locations in the new layout */
+ __raid10_find_phys(&conf->geo, r10_bio);
+
+ blist = read_bio;
+ read_bio->bi_next = NULL;
+
+ for (s = 0; s < conf->copies*2; s++) {
+ struct bio *b;
+ int d = r10_bio->devs[s/2].devnum;
+ struct md_rdev *rdev2;
+ if (s&1) {
+ rdev2 = conf->mirrors[d].replacement;
+ b = r10_bio->devs[s/2].repl_bio;
+ } else {
+ rdev2 = conf->mirrors[d].rdev;
+ b = r10_bio->devs[s/2].bio;
+ }
+ if (!rdev2 || test_bit(Faulty, &rdev2->flags))
+ continue;
+ b->bi_bdev = rdev2->bdev;
+ b->bi_sector = r10_bio->devs[s/2].addr + rdev2->new_data_offset;
+ b->bi_private = r10_bio;
+ b->bi_end_io = end_reshape_write;
+ b->bi_rw = WRITE;
+ b->bi_flags &= ~(BIO_POOL_MASK - 1);
+ b->bi_flags |= 1 << BIO_UPTODATE;
+ b->bi_next = blist;
+ b->bi_vcnt = 0;
+ b->bi_idx = 0;
+ b->bi_size = 0;
+ blist = b;
+ }
+
+ /* Now add as many pages as possible to all of these bios. */
+
+ nr_sectors = 0;
+ for (s = 0 ; s < max_sectors; s += PAGE_SIZE >> 9) {
+ struct page *page = r10_bio->devs[0].bio->bi_io_vec[s/(PAGE_SIZE>>9)].bv_page;
+ int len = (max_sectors - s) << 9;
+ if (len > PAGE_SIZE)
+ len = PAGE_SIZE;
+ for (bio = blist; bio ; bio = bio->bi_next) {
+ struct bio *bio2;
+ if (bio_add_page(bio, page, len, 0))
+ continue;
+
+ /* Didn't fit, must stop */
+ for (bio2 = blist;
+ bio2 && bio2 != bio;
+ bio2 = bio2->bi_next) {
+ /* Remove last page from this bio */
+ bio2->bi_vcnt--;
+ bio2->bi_size -= len;
+ bio2->bi_flags &= ~(1<<BIO_SEG_VALID);
+ }
+ goto bio_full;
+ }
+ sector_nr += len >> 9;
+ nr_sectors += len >> 9;
+ }
+bio_full:
+ r10_bio->sectors = nr_sectors;
+
+ /* Now submit the read */
+ md_sync_acct(read_bio->bi_bdev, r10_bio->sectors);
+ atomic_inc(&r10_bio->remaining);
+ read_bio->bi_next = NULL;
+ generic_make_request(read_bio);
+ sector_nr += nr_sectors;
+ sectors_done += nr_sectors;
+ if (sector_nr <= last)
+ goto read_more;
+
+ /* Now that we have done the whole section we can
+ * update reshape_progress
+ */
+ if (mddev->reshape_backwards)
+ conf->reshape_progress -= sectors_done;
+ else
+ conf->reshape_progress += sectors_done;
+
+ return sectors_done;
+}
+
+static void end_reshape_request(struct r10bio *r10_bio);
+static int handle_reshape_read_error(struct mddev *mddev,
+ struct r10bio *r10_bio);
+static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio)
+{
+ /* Reshape read completed. Hopefully we have a block
+ * to write out.
+ * If we got a read error then we do sync 1-page reads from
+ * elsewhere until we find the data - or give up.
+ */
+ struct r10conf *conf = mddev->private;
+ int s;
+
+ if (!test_bit(R10BIO_Uptodate, &r10_bio->state))
+ if (handle_reshape_read_error(mddev, r10_bio) < 0) {
+ /* Reshape has been aborted */
+ md_done_sync(mddev, r10_bio->sectors, 0);
+ return;
+ }
+
+ /* We definitely have the data in the pages, schedule the
+ * writes.
+ */
+ atomic_set(&r10_bio->remaining, 1);
+ for (s = 0; s < conf->copies*2; s++) {
+ struct bio *b;
+ int d = r10_bio->devs[s/2].devnum;
+ struct md_rdev *rdev;
+ if (s&1) {
+ rdev = conf->mirrors[d].replacement;
+ b = r10_bio->devs[s/2].repl_bio;
+ } else {
+ rdev = conf->mirrors[d].rdev;
+ b = r10_bio->devs[s/2].bio;
+ }
+ if (!rdev || test_bit(Faulty, &rdev->flags))
+ continue;
+ atomic_inc(&rdev->nr_pending);
+ md_sync_acct(b->bi_bdev, r10_bio->sectors);
+ atomic_inc(&r10_bio->remaining);
+ b->bi_next = NULL;
+ generic_make_request(b);
+ }
+ end_reshape_request(r10_bio);
+}
+
+static void end_reshape(struct r10conf *conf)
+{
+ if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery))
+ return;
+
+ spin_lock_irq(&conf->device_lock);
+ conf->prev = conf->geo;
+ md_finish_reshape(conf->mddev);
+ smp_wmb();
+ conf->reshape_progress = MaxSector;
+ spin_unlock_irq(&conf->device_lock);
+
+ /* read-ahead size must cover two whole stripes, which is
+ * 2 * (datadisks) * chunksize where 'n' is the number of raid devices
+ */
+ if (conf->mddev->queue) {
+ int stripe = conf->geo.raid_disks *
+ ((conf->mddev->chunk_sectors << 9) / PAGE_SIZE);
+ stripe /= conf->geo.near_copies;
+ if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
+ conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
+ }
+ conf->fullsync = 0;
+}
+
+
+static int handle_reshape_read_error(struct mddev *mddev,
+ struct r10bio *r10_bio)
+{
+ /* Use sync reads to get the blocks from somewhere else */
+ int sectors = r10_bio->sectors;
+ struct r10bio r10b;
+ struct r10conf *conf = mddev->private;
+ int slot = 0;
+ int idx = 0;
+ struct bio_vec *bvec = r10_bio->master_bio->bi_io_vec;
+
+ r10b.sector = r10_bio->sector;
+ __raid10_find_phys(&conf->prev, &r10b);
+
+ while (sectors) {
+ int s = sectors;
+ int success = 0;
+ int first_slot = slot;
+
+ if (s > (PAGE_SIZE >> 9))
+ s = PAGE_SIZE >> 9;
+
+ while (!success) {
+ int d = r10b.devs[slot].devnum;
+ struct md_rdev *rdev = conf->mirrors[d].rdev;
+ sector_t addr;
+ if (rdev == NULL ||
+ test_bit(Faulty, &rdev->flags) ||
+ !test_bit(In_sync, &rdev->flags))
+ goto failed;
+
+ addr = r10b.devs[slot].addr + idx * PAGE_SIZE;
+ success = sync_page_io(rdev,
+ addr,
+ s << 9,
+ bvec[idx].bv_page,
+ READ, false);
+ if (success)
+ break;
+ failed:
+ slot++;
+ if (slot >= conf->copies)
+ slot = 0;
+ if (slot == first_slot)
+ break;
+ }
+ if (!success) {
+ /* couldn't read this block, must give up */
+ set_bit(MD_RECOVERY_INTR,
+ &mddev->recovery);
+ return -EIO;
+ }
+ sectors -= s;
+ idx++;
+ }
+ return 0;
+}
+
+static void end_reshape_write(struct bio *bio, int error)
+{
+ int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
+ struct r10bio *r10_bio = bio->bi_private;
+ struct mddev *mddev = r10_bio->mddev;
+ struct r10conf *conf = mddev->private;
+ int d;
+ int slot;
+ int repl;
+ struct md_rdev *rdev = NULL;
+
+ d = find_bio_disk(conf, r10_bio, bio, &slot, &repl);
+ if (repl)
+ rdev = conf->mirrors[d].replacement;
+ if (!rdev) {
+ smp_mb();
+ rdev = conf->mirrors[d].rdev;
+ }
+
+ if (!uptodate) {
+ /* FIXME should record badblock */
+ md_error(mddev, rdev);
+ }
+
+ rdev_dec_pending(rdev, mddev);
+ end_reshape_request(r10_bio);
+}
+
+static void end_reshape_request(struct r10bio *r10_bio)
+{
+ if (!atomic_dec_and_test(&r10_bio->remaining))
+ return;
+ md_done_sync(r10_bio->mddev, r10_bio->sectors, 1);
+ bio_put(r10_bio->master_bio);
+ put_buf(r10_bio);
+}
+
+static void raid10_finish_reshape(struct mddev *mddev)
+{
+ struct r10conf *conf = mddev->private;
+
+ if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
+ return;
+
+ if (mddev->delta_disks > 0) {
+ sector_t size = raid10_size(mddev, 0, 0);
+ md_set_array_sectors(mddev, size);
+ if (mddev->recovery_cp > mddev->resync_max_sectors) {
+ mddev->recovery_cp = mddev->resync_max_sectors;
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ }
+ mddev->resync_max_sectors = size;
+ set_capacity(mddev->gendisk, mddev->array_sectors);
+ revalidate_disk(mddev->gendisk);
+ } else {
+ int d;
+ for (d = conf->geo.raid_disks ;
+ d < conf->geo.raid_disks - mddev->delta_disks;
+ d++) {
+ struct md_rdev *rdev = conf->mirrors[d].rdev;
+ if (rdev)
+ clear_bit(In_sync, &rdev->flags);
+ rdev = conf->mirrors[d].replacement;
+ if (rdev)
+ clear_bit(In_sync, &rdev->flags);
+ }
+ }
+ mddev->layout = mddev->new_layout;
+ mddev->chunk_sectors = 1 << conf->geo.chunk_shift;
+ mddev->reshape_position = MaxSector;
+ mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
+}
+
static struct md_personality raid10_personality =
{
.name = "raid10",
@@ -3552,6 +4524,9 @@ static struct md_personality raid10_personality =
.size = raid10_size,
.resize = raid10_resize,
.takeover = raid10_takeover,
+ .check_reshape = raid10_check_reshape,
+ .start_reshape = raid10_start_reshape,
+ .finish_reshape = raid10_finish_reshape,
};
static int __init raid_init(void)
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 7c615613..135b1b0 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -14,32 +14,38 @@ struct mirror_info {
struct r10conf {
struct mddev *mddev;
struct mirror_info *mirrors;
- int raid_disks;
+ struct mirror_info *mirrors_new, *mirrors_old;
spinlock_t device_lock;
/* geometry */
- int near_copies; /* number of copies laid out
+ struct geom {
+ int raid_disks;
+ int near_copies; /* number of copies laid out
* raid0 style */
- int far_copies; /* number of copies laid out
+ int far_copies; /* number of copies laid out
* at large strides across drives
*/
- int far_offset; /* far_copies are offset by 1
+ int far_offset; /* far_copies are offset by 1
* stripe instead of many
*/
- int copies; /* near_copies * far_copies.
- * must be <= raid_disks
- */
- sector_t stride; /* distance between far copies.
+ sector_t stride; /* distance between far copies.
* This is size / far_copies unless
* far_offset, in which case it is
* 1 stripe.
*/
+ int chunk_shift; /* shift from chunks to sectors */
+ sector_t chunk_mask;
+ } prev, geo;
+ int copies; /* near_copies * far_copies.
+ * must be <= raid_disks
+ */
sector_t dev_sectors; /* temp copy of
* mddev->dev_sectors */
-
- int chunk_shift; /* shift from chunks to sectors */
- sector_t chunk_mask;
+ sector_t reshape_progress;
+ sector_t reshape_safe;
+ unsigned long reshape_checkpoint;
+ sector_t offset_diff;
struct list_head retry_list;
/* queue pending writes and submit them on unplug */
@@ -136,6 +142,7 @@ enum r10bio_state {
R10BIO_Uptodate,
R10BIO_IsSync,
R10BIO_IsRecover,
+ R10BIO_IsReshape,
R10BIO_Degraded,
/* Set ReadError on bios that experience a read error
* so that raid10d knows what to do with them.
@@ -146,5 +153,10 @@ enum r10bio_state {
*/
R10BIO_MadeGood,
R10BIO_WriteError,
+/* During a reshape we might be performing IO on the
+ * 'previous' part of the array, in which case this
+ * flag is set
+ */
+ R10BIO_Previous,
};
#endif
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f351422..d267672 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -488,6 +488,27 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
return sh;
}
+/* Determine if 'data_offset' or 'new_data_offset' should be used
+ * in this stripe_head.
+ */
+static int use_new_offset(struct r5conf *conf, struct stripe_head *sh)
+{
+ sector_t progress = conf->reshape_progress;
+ /* Need a memory barrier to make sure we see the value
+ * of conf->generation, or ->data_offset that was set before
+ * reshape_progress was updated.
+ */
+ smp_rmb();
+ if (progress == MaxSector)
+ return 0;
+ if (sh->generation == conf->generation - 1)
+ return 0;
+ /* We are in a reshape, and this is a new-generation stripe,
+ * so use new_data_offset.
+ */
+ return 1;
+}
+
static void
raid5_end_read_request(struct bio *bi, int error);
static void
@@ -518,6 +539,8 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
replace_only = 1;
} else
continue;
+ if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags))
+ rw |= REQ_SYNC;
bi = &sh->dev[i].req;
rbi = &sh->dev[i].rreq; /* For writing to replacement */
@@ -603,7 +626,12 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
__func__, (unsigned long long)sh->sector,
bi->bi_rw, i);
atomic_inc(&sh->count);
- bi->bi_sector = sh->sector + rdev->data_offset;
+ if (use_new_offset(conf, sh))
+ bi->bi_sector = (sh->sector
+ + rdev->new_data_offset);
+ else
+ bi->bi_sector = (sh->sector
+ + rdev->data_offset);
bi->bi_flags = 1 << BIO_UPTODATE;
bi->bi_idx = 0;
bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
@@ -627,7 +655,12 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
__func__, (unsigned long long)sh->sector,
rbi->bi_rw, i);
atomic_inc(&sh->count);
- rbi->bi_sector = sh->sector + rrdev->data_offset;
+ if (use_new_offset(conf, sh))
+ rbi->bi_sector = (sh->sector
+ + rrdev->new_data_offset);
+ else
+ rbi->bi_sector = (sh->sector
+ + rrdev->data_offset);
rbi->bi_flags = 1 << BIO_UPTODATE;
rbi->bi_idx = 0;
rbi->bi_io_vec[0].bv_len = STRIPE_SIZE;
@@ -1114,6 +1147,8 @@ ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx)
dev->sector + STRIPE_SECTORS) {
if (wbi->bi_rw & REQ_FUA)
set_bit(R5_WantFUA, &dev->flags);
+ if (wbi->bi_rw & REQ_SYNC)
+ set_bit(R5_SyncIO, &dev->flags);
tx = async_copy_data(1, wbi, dev->page,
dev->sector, tx);
wbi = r5_next_bio(wbi, dev->sector);
@@ -1131,13 +1166,15 @@ static void ops_complete_reconstruct(void *stripe_head_ref)
int pd_idx = sh->pd_idx;
int qd_idx = sh->qd_idx;
int i;
- bool fua = false;
+ bool fua = false, sync = false;
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
- for (i = disks; i--; )
+ for (i = disks; i--; ) {
fua |= test_bit(R5_WantFUA, &sh->dev[i].flags);
+ sync |= test_bit(R5_SyncIO, &sh->dev[i].flags);
+ }
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
@@ -1146,6 +1183,8 @@ static void ops_complete_reconstruct(void *stripe_head_ref)
set_bit(R5_UPTODATE, &dev->flags);
if (fua)
set_bit(R5_WantFUA, &dev->flags);
+ if (sync)
+ set_bit(R5_SyncIO, &dev->flags);
}
}
@@ -1648,7 +1687,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
char b[BDEVNAME_SIZE];
struct md_rdev *rdev = NULL;
-
+ sector_t s;
for (i=0 ; i<disks; i++)
if (bi == &sh->dev[i].req)
@@ -1671,6 +1710,10 @@ static void raid5_end_read_request(struct bio * bi, int error)
if (!rdev)
rdev = conf->disks[i].rdev;
+ if (use_new_offset(conf, sh))
+ s = sh->sector + rdev->new_data_offset;
+ else
+ s = sh->sector + rdev->data_offset;
if (uptodate) {
set_bit(R5_UPTODATE, &sh->dev[i].flags);
if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
@@ -1683,8 +1726,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
"md/raid:%s: read error corrected"
" (%lu sectors at %llu on %s)\n",
mdname(conf->mddev), STRIPE_SECTORS,
- (unsigned long long)(sh->sector
- + rdev->data_offset),
+ (unsigned long long)s,
bdevname(rdev->bdev, b));
atomic_add(STRIPE_SECTORS, &rdev->corrected_errors);
clear_bit(R5_ReadError, &sh->dev[i].flags);
@@ -1704,8 +1746,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
"md/raid:%s: read error on replacement device "
"(sector %llu on %s).\n",
mdname(conf->mddev),
- (unsigned long long)(sh->sector
- + rdev->data_offset),
+ (unsigned long long)s,
bdn);
else if (conf->mddev->degraded >= conf->max_degraded)
printk_ratelimited(
@@ -1713,8 +1754,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
"md/raid:%s: read error not correctable "
"(sector %llu on %s).\n",
mdname(conf->mddev),
- (unsigned long long)(sh->sector
- + rdev->data_offset),
+ (unsigned long long)s,
bdn);
else if (test_bit(R5_ReWrite, &sh->dev[i].flags))
/* Oh, no!!! */
@@ -1723,8 +1763,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
"md/raid:%s: read error NOT corrected!! "
"(sector %llu on %s).\n",
mdname(conf->mddev),
- (unsigned long long)(sh->sector
- + rdev->data_offset),
+ (unsigned long long)s,
bdn);
else if (atomic_read(&rdev->read_errors)
> conf->max_nr_stripes)
@@ -3561,7 +3600,7 @@ finish:
if (test_and_clear_bit(R5_MadeGood, &dev->flags)) {
rdev = conf->disks[i].rdev;
rdev_clear_badblocks(rdev, sh->sector,
- STRIPE_SECTORS);
+ STRIPE_SECTORS, 0);
rdev_dec_pending(rdev, conf->mddev);
}
if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) {
@@ -3570,7 +3609,7 @@ finish:
/* rdev have been moved down */
rdev = conf->disks[i].rdev;
rdev_clear_badblocks(rdev, sh->sector,
- STRIPE_SECTORS);
+ STRIPE_SECTORS, 0);
rdev_dec_pending(rdev, conf->mddev);
}
}
@@ -3842,6 +3881,7 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
raid_bio->bi_next = (void*)rdev;
align_bi->bi_bdev = rdev->bdev;
align_bi->bi_flags &= ~(1 << BIO_SEG_VALID);
+ /* No reshape active, so we can trust rdev->data_offset */
align_bi->bi_sector += rdev->data_offset;
if (!bio_fits_rdev(align_bi) ||
@@ -3953,12 +3993,10 @@ static void make_request(struct mddev *mddev, struct bio * bi)
plugged = mddev_check_plugged(mddev);
for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) {
DEFINE_WAIT(w);
- int disks, data_disks;
int previous;
retry:
previous = 0;
- disks = conf->raid_disks;
prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
if (unlikely(conf->reshape_progress != MaxSector)) {
/* spinlock is needed as reshape_progress may be
@@ -3970,13 +4008,12 @@ static void make_request(struct mddev *mddev, struct bio * bi)
* to check again.
*/
spin_lock_irq(&conf->device_lock);
- if (mddev->delta_disks < 0
+ if (mddev->reshape_backwards
? logical_sector < conf->reshape_progress
: logical_sector >= conf->reshape_progress) {
- disks = conf->previous_raid_disks;
previous = 1;
} else {
- if (mddev->delta_disks < 0
+ if (mddev->reshape_backwards
? logical_sector < conf->reshape_safe
: logical_sector >= conf->reshape_safe) {
spin_unlock_irq(&conf->device_lock);
@@ -3986,7 +4023,6 @@ static void make_request(struct mddev *mddev, struct bio * bi)
}
spin_unlock_irq(&conf->device_lock);
}
- data_disks = disks - conf->max_degraded;
new_sector = raid5_compute_sector(conf, logical_sector,
previous,
@@ -4009,7 +4045,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
*/
int must_retry = 0;
spin_lock_irq(&conf->device_lock);
- if (mddev->delta_disks < 0
+ if (mddev->reshape_backwards
? logical_sector >= conf->reshape_progress
: logical_sector < conf->reshape_progress)
/* mismatch, need to try again */
@@ -4108,11 +4144,11 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
if (sector_nr == 0) {
/* If restarting in the middle, skip the initial sectors */
- if (mddev->delta_disks < 0 &&
+ if (mddev->reshape_backwards &&
conf->reshape_progress < raid5_size(mddev, 0, 0)) {
sector_nr = raid5_size(mddev, 0, 0)
- conf->reshape_progress;
- } else if (mddev->delta_disks >= 0 &&
+ } else if (!mddev->reshape_backwards &&
conf->reshape_progress > 0)
sector_nr = conf->reshape_progress;
sector_div(sector_nr, new_data_disks);
@@ -4133,13 +4169,11 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
else
reshape_sectors = mddev->chunk_sectors;
- /* we update the metadata when there is more than 3Meg
- * in the block range (that is rather arbitrary, should
- * probably be time based) or when the data about to be
- * copied would over-write the source of the data at
- * the front of the range.
- * i.e. one new_stripe along from reshape_progress new_maps
- * to after where reshape_safe old_maps to
+ /* We update the metadata at least every 10 seconds, or when
+ * the data about to be copied would over-write the source of
+ * the data at the front of the range. i.e. one new_stripe
+ * along from reshape_progress new_maps to after where
+ * reshape_safe old_maps to
*/
writepos = conf->reshape_progress;
sector_div(writepos, new_data_disks);
@@ -4147,7 +4181,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
sector_div(readpos, data_disks);
safepos = conf->reshape_safe;
sector_div(safepos, data_disks);
- if (mddev->delta_disks < 0) {
+ if (mddev->reshape_backwards) {
writepos -= min_t(sector_t, reshape_sectors, writepos);
readpos += reshape_sectors;
safepos += reshape_sectors;
@@ -4157,11 +4191,29 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
safepos -= min_t(sector_t, reshape_sectors, safepos);
}
+ /* Having calculated the 'writepos' possibly use it
+ * to set 'stripe_addr' which is where we will write to.
+ */
+ if (mddev->reshape_backwards) {
+ BUG_ON(conf->reshape_progress == 0);
+ stripe_addr = writepos;
+ BUG_ON((mddev->dev_sectors &
+ ~((sector_t)reshape_sectors - 1))
+ - reshape_sectors - stripe_addr
+ != sector_nr);
+ } else {
+ BUG_ON(writepos != sector_nr + reshape_sectors);
+ stripe_addr = sector_nr;
+ }
+
/* 'writepos' is the most advanced device address we might write.
* 'readpos' is the least advanced device address we might read.
* 'safepos' is the least address recorded in the metadata as having
* been reshaped.
- * If 'readpos' is behind 'writepos', then there is no way that we can
+ * If there is a min_offset_diff, these are adjusted either by
+ * increasing the safepos/readpos if diff is negative, or
+ * increasing writepos if diff is positive.
+ * If 'readpos' is then behind 'writepos', there is no way that we can
* ensure safety in the face of a crash - that must be done by userspace
* making a backup of the data. So in that case there is no particular
* rush to update metadata.
@@ -4174,7 +4226,13 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
* Maybe that number should be configurable, but I'm not sure it is
* worth it.... maybe it could be a multiple of safemode_delay???
*/
- if ((mddev->delta_disks < 0
+ if (conf->min_offset_diff < 0) {
+ safepos += -conf->min_offset_diff;
+ readpos += -conf->min_offset_diff;
+ } else
+ writepos += conf->min_offset_diff;
+
+ if ((mddev->reshape_backwards
? (safepos > writepos && readpos < writepos)
: (safepos < writepos && readpos > writepos)) ||
time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) {
@@ -4195,17 +4253,6 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}
- if (mddev->delta_disks < 0) {
- BUG_ON(conf->reshape_progress == 0);
- stripe_addr = writepos;
- BUG_ON((mddev->dev_sectors &
- ~((sector_t)reshape_sectors - 1))
- - reshape_sectors - stripe_addr
- != sector_nr);
- } else {
- BUG_ON(writepos != sector_nr + reshape_sectors);
- stripe_addr = sector_nr;
- }
INIT_LIST_HEAD(&stripes);
for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) {
int j;
@@ -4239,7 +4286,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
list_add(&sh->lru, &stripes);
}
spin_lock_irq(&conf->device_lock);
- if (mddev->delta_disks < 0)
+ if (mddev->reshape_backwards)
conf->reshape_progress -= reshape_sectors * new_data_disks;
else
conf->reshape_progress += reshape_sectors * new_data_disks;
@@ -4952,16 +4999,42 @@ static int run(struct mddev *mddev)
struct md_rdev *rdev;
sector_t reshape_offset = 0;
int i;
+ long long min_offset_diff = 0;
+ int first = 1;
if (mddev->recovery_cp != MaxSector)
printk(KERN_NOTICE "md/raid:%s: not clean"
" -- starting background reconstruction\n",
mdname(mddev));
+
+ rdev_for_each(rdev, mddev) {
+ long long diff;
+ if (rdev->raid_disk < 0)
+ continue;
+ diff = (rdev->new_data_offset - rdev->data_offset);
+ if (first) {
+ min_offset_diff = diff;
+ first = 0;
+ } else if (mddev->reshape_backwards &&
+ diff < min_offset_diff)
+ min_offset_diff = diff;
+ else if (!mddev->reshape_backwards &&
+ diff > min_offset_diff)
+ min_offset_diff = diff;
+ }
+
if (mddev->reshape_position != MaxSector) {
/* Check that we can continue the reshape.
- * Currently only disks can change, it must
- * increase, and we must be past the point where
- * a stripe over-writes itself
+ * Difficulties arise if the stripe we would write to
+ * next is at or after the stripe we would read from next.
+ * For a reshape that changes the number of devices, this
+ * is only possible for a very short time, and mdadm makes
+ * sure that time appears to have past before assembling
+ * the array. So we fail if that time hasn't passed.
+ * For a reshape that keeps the number of devices the same
+ * mdadm must be monitoring the reshape can keeping the
+ * critical areas read-only and backed up. It will start
+ * the array in read-only mode, so we check for that.
*/
sector_t here_new, here_old;
int old_disks;
@@ -4993,26 +5066,34 @@ static int run(struct mddev *mddev)
/* here_old is the first stripe that we might need to read
* from */
if (mddev->delta_disks == 0) {
+ if ((here_new * mddev->new_chunk_sectors !=
+ here_old * mddev->chunk_sectors)) {
+ printk(KERN_ERR "md/raid:%s: reshape position is"
+ " confused - aborting\n", mdname(mddev));
+ return -EINVAL;
+ }
/* We cannot be sure it is safe to start an in-place
- * reshape. It is only safe if user-space if monitoring
+ * reshape. It is only safe if user-space is monitoring
* and taking constant backups.
* mdadm always starts a situation like this in
* readonly mode so it can take control before
* allowing any writes. So just check for that.
*/
- if ((here_new * mddev->new_chunk_sectors !=
- here_old * mddev->chunk_sectors) ||
- mddev->ro == 0) {
- printk(KERN_ERR "md/raid:%s: in-place reshape must be started"
- " in read-only mode - aborting\n",
+ if (abs(min_offset_diff) >= mddev->chunk_sectors &&
+ abs(min_offset_diff) >= mddev->new_chunk_sectors)
+ /* not really in-place - so OK */;
+ else if (mddev->ro == 0) {
+ printk(KERN_ERR "md/raid:%s: in-place reshape "
+ "must be started in read-only mode "
+ "- aborting\n",
mdname(mddev));
return -EINVAL;
}
- } else if (mddev->delta_disks < 0
- ? (here_new * mddev->new_chunk_sectors <=
+ } else if (mddev->reshape_backwards
+ ? (here_new * mddev->new_chunk_sectors + min_offset_diff <=
here_old * mddev->chunk_sectors)
: (here_new * mddev->new_chunk_sectors >=
- here_old * mddev->chunk_sectors)) {
+ here_old * mddev->chunk_sectors + (-min_offset_diff))) {
/* Reading from the same stripe as writing to - bad */
printk(KERN_ERR "md/raid:%s: reshape_position too early for "
"auto-recovery - aborting.\n",
@@ -5037,6 +5118,7 @@ static int run(struct mddev *mddev)
if (IS_ERR(conf))
return PTR_ERR(conf);
+ conf->min_offset_diff = min_offset_diff;
mddev->thread = conf->thread;
conf->thread = NULL;
mddev->private = conf;
@@ -5182,9 +5264,12 @@ static int run(struct mddev *mddev)
blk_queue_io_opt(mddev->queue, chunk_size *
(conf->raid_disks - conf->max_degraded));
- rdev_for_each(rdev, mddev)
+ rdev_for_each(rdev, mddev) {
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
+ disk_stack_limits(mddev->gendisk, rdev->bdev,
+ rdev->new_data_offset << 9);
+ }
}
return 0;
@@ -5418,12 +5503,18 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
+ sector_t newsize;
sectors &= ~((sector_t)mddev->chunk_sectors - 1);
- md_set_array_sectors(mddev, raid5_size(mddev, sectors,
- mddev->raid_disks));
- if (mddev->array_sectors >
- raid5_size(mddev, sectors, mddev->raid_disks))
+ newsize = raid5_size(mddev, sectors, mddev->raid_disks);
+ if (mddev->external_size &&
+ mddev->array_sectors > newsize)
return -EINVAL;
+ if (mddev->bitmap) {
+ int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0);
+ if (ret)
+ return ret;
+ }
+ md_set_array_sectors(mddev, newsize);
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
if (sectors > mddev->dev_sectors &&
@@ -5468,9 +5559,6 @@ static int check_reshape(struct mddev *mddev)
mddev->new_layout == mddev->layout &&
mddev->new_chunk_sectors == mddev->chunk_sectors)
return 0; /* nothing to do */
- if (mddev->bitmap)
- /* Cannot grow a bitmap yet */
- return -EBUSY;
if (has_failed(conf))
return -EINVAL;
if (mddev->delta_disks < 0) {
@@ -5505,10 +5593,14 @@ static int raid5_start_reshape(struct mddev *mddev)
if (!check_stripe_cache(mddev))
return -ENOSPC;
- rdev_for_each(rdev, mddev)
+ if (has_failed(conf))
+ return -EINVAL;
+
+ rdev_for_each(rdev, mddev) {
if (!test_bit(In_sync, &rdev->flags)
&& !test_bit(Faulty, &rdev->flags))
spares++;
+ }
if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded)
/* Not enough devices even to make a degraded array
@@ -5535,12 +5627,16 @@ static int raid5_start_reshape(struct mddev *mddev)
conf->chunk_sectors = mddev->new_chunk_sectors;
conf->prev_algo = conf->algorithm;
conf->algorithm = mddev->new_layout;
- if (mddev->delta_disks < 0)
+ conf->generation++;
+ /* Code that selects data_offset needs to see the generation update
+ * if reshape_progress has been set - so a memory barrier needed.
+ */
+ smp_mb();
+ if (mddev->reshape_backwards)
conf->reshape_progress = raid5_size(mddev, 0, 0);
else
conf->reshape_progress = 0;
conf->reshape_safe = conf->reshape_progress;
- conf->generation++;
spin_unlock_irq(&conf->device_lock);
/* Add some new drives, as many as will fit.
@@ -5592,6 +5688,9 @@ static int raid5_start_reshape(struct mddev *mddev)
mddev->recovery = 0;
spin_lock_irq(&conf->device_lock);
mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks;
+ rdev_for_each(rdev, mddev)
+ rdev->new_data_offset = rdev->data_offset;
+ smp_wmb();
conf->reshape_progress = MaxSector;
mddev->reshape_position = MaxSector;
spin_unlock_irq(&conf->device_lock);
@@ -5610,9 +5709,13 @@ static void end_reshape(struct r5conf *conf)
{
if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) {
+ struct md_rdev *rdev;
spin_lock_irq(&conf->device_lock);
conf->previous_raid_disks = conf->raid_disks;
+ rdev_for_each(rdev, conf->mddev)
+ rdev->data_offset = rdev->new_data_offset;
+ smp_wmb();
conf->reshape_progress = MaxSector;
spin_unlock_irq(&conf->device_lock);
wake_up(&conf->wait_for_overlap);
@@ -5652,17 +5755,18 @@ static void raid5_finish_reshape(struct mddev *mddev)
d < conf->raid_disks - mddev->delta_disks;
d++) {
struct md_rdev *rdev = conf->disks[d].rdev;
- if (rdev &&
- raid5_remove_disk(mddev, rdev) == 0) {
- sysfs_unlink_rdev(mddev, rdev);
- rdev->raid_disk = -1;
- }
+ if (rdev)
+ clear_bit(In_sync, &rdev->flags);
+ rdev = conf->disks[d].replacement;
+ if (rdev)
+ clear_bit(In_sync, &rdev->flags);
}
}
mddev->layout = conf->algorithm;
mddev->chunk_sectors = conf->chunk_sectors;
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
}
}
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 8d8e139..2164021 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -285,6 +285,7 @@ enum r5dev_flags {
*/
R5_Wantdrain, /* dev->towrite needs to be drained */
R5_WantFUA, /* Write should be FUA */
+ R5_SyncIO, /* The IO is sync */
R5_WriteError, /* got a write error - need to record it */
R5_MadeGood, /* A bad block has been fixed by writing to it */
R5_ReadRepl, /* Will/did read from replacement rather than orig */
@@ -385,6 +386,12 @@ struct r5conf {
short generation; /* increments with every reshape */
unsigned long reshape_checkpoint; /* Time we last updated
* metadata */
+ long long min_offset_diff; /* minimum difference between
+ * data_offset and
+ * new_data_offset across all
+ * devices. May be negative,
+ * but is closest to zero.
+ */
struct list_head handle_list; /* stripes needing handling */
struct list_head hold_list; /* preread ready stripes */
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