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-rw-r--r--Documentation/filesystems/nilfs2.txt7
-rw-r--r--fs/nilfs2/alloc.c108
-rw-r--r--fs/nilfs2/alloc.h21
-rw-r--r--fs/nilfs2/bmap.c8
-rw-r--r--fs/nilfs2/btnode.c76
-rw-r--r--fs/nilfs2/btnode.h6
-rw-r--r--fs/nilfs2/btree.c106
-rw-r--r--fs/nilfs2/btree.h22
-rw-r--r--fs/nilfs2/cpfile.c26
-rw-r--r--fs/nilfs2/cpfile.h3
-rw-r--r--fs/nilfs2/dat.c47
-rw-r--r--fs/nilfs2/dat.h3
-rw-r--r--fs/nilfs2/dir.c24
-rw-r--r--fs/nilfs2/gcdat.c3
-rw-r--r--fs/nilfs2/gcinode.c6
-rw-r--r--fs/nilfs2/ifile.c35
-rw-r--r--fs/nilfs2/ifile.h2
-rw-r--r--fs/nilfs2/inode.c7
-rw-r--r--fs/nilfs2/mdt.c56
-rw-r--r--fs/nilfs2/mdt.h25
-rw-r--r--fs/nilfs2/namei.c83
-rw-r--r--fs/nilfs2/recovery.c34
-rw-r--r--fs/nilfs2/segbuf.c185
-rw-r--r--fs/nilfs2/segbuf.h54
-rw-r--r--fs/nilfs2/segment.c369
-rw-r--r--fs/nilfs2/segment.h2
-rw-r--r--fs/nilfs2/sufile.c203
-rw-r--r--fs/nilfs2/sufile.h14
-rw-r--r--fs/nilfs2/super.c88
-rw-r--r--fs/nilfs2/the_nilfs.c155
-rw-r--r--fs/nilfs2/the_nilfs.h10
-rw-r--r--include/linux/nilfs2_fs.h24
32 files changed, 1025 insertions, 787 deletions
diff --git a/Documentation/filesystems/nilfs2.txt b/Documentation/filesystems/nilfs2.txt
index 01539f4..4949fca 100644
--- a/Documentation/filesystems/nilfs2.txt
+++ b/Documentation/filesystems/nilfs2.txt
@@ -49,8 +49,7 @@ Mount options
NILFS2 supports the following mount options:
(*) == default
-barrier=on(*) This enables/disables barriers. barrier=off disables
- it, barrier=on enables it.
+nobarrier Disables barriers.
errors=continue(*) Keep going on a filesystem error.
errors=remount-ro Remount the filesystem read-only on an error.
errors=panic Panic and halt the machine if an error occurs.
@@ -71,6 +70,10 @@ order=strict Apply strict in-order semantics that preserves sequence
blocks. That means, it is guaranteed that no
overtaking of events occurs in the recovered file
system after a crash.
+norecovery Disable recovery of the filesystem on mount.
+ This disables every write access on the device for
+ read-only mounts or snapshots. This option will fail
+ for r/w mounts on an unclean volume.
NILFS2 usage
============
diff --git a/fs/nilfs2/alloc.c b/fs/nilfs2/alloc.c
index d69e6ae..3f959f1 100644
--- a/fs/nilfs2/alloc.c
+++ b/fs/nilfs2/alloc.c
@@ -142,29 +142,75 @@ static void nilfs_palloc_desc_block_init(struct inode *inode,
}
}
+static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff,
+ int create,
+ void (*init_block)(struct inode *,
+ struct buffer_head *,
+ void *),
+ struct buffer_head **bhp,
+ struct nilfs_bh_assoc *prev,
+ spinlock_t *lock)
+{
+ int ret;
+
+ spin_lock(lock);
+ if (prev->bh && blkoff == prev->blkoff) {
+ get_bh(prev->bh);
+ *bhp = prev->bh;
+ spin_unlock(lock);
+ return 0;
+ }
+ spin_unlock(lock);
+
+ ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
+ if (!ret) {
+ spin_lock(lock);
+ /*
+ * The following code must be safe for change of the
+ * cache contents during the get block call.
+ */
+ brelse(prev->bh);
+ get_bh(*bhp);
+ prev->bh = *bhp;
+ prev->blkoff = blkoff;
+ spin_unlock(lock);
+ }
+ return ret;
+}
+
static int nilfs_palloc_get_desc_block(struct inode *inode,
unsigned long group,
int create, struct buffer_head **bhp)
{
- return nilfs_mdt_get_block(inode,
- nilfs_palloc_desc_blkoff(inode, group),
- create, nilfs_palloc_desc_block_init, bhp);
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ return nilfs_palloc_get_block(inode,
+ nilfs_palloc_desc_blkoff(inode, group),
+ create, nilfs_palloc_desc_block_init,
+ bhp, &cache->prev_desc, &cache->lock);
}
static int nilfs_palloc_get_bitmap_block(struct inode *inode,
unsigned long group,
int create, struct buffer_head **bhp)
{
- return nilfs_mdt_get_block(inode,
- nilfs_palloc_bitmap_blkoff(inode, group),
- create, NULL, bhp);
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ return nilfs_palloc_get_block(inode,
+ nilfs_palloc_bitmap_blkoff(inode, group),
+ create, NULL, bhp,
+ &cache->prev_bitmap, &cache->lock);
}
int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr,
int create, struct buffer_head **bhp)
{
- return nilfs_mdt_get_block(inode, nilfs_palloc_entry_blkoff(inode, nr),
- create, NULL, bhp);
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ return nilfs_palloc_get_block(inode,
+ nilfs_palloc_entry_blkoff(inode, nr),
+ create, NULL, bhp,
+ &cache->prev_entry, &cache->lock);
}
static struct nilfs_palloc_group_desc *
@@ -176,13 +222,6 @@ nilfs_palloc_block_get_group_desc(const struct inode *inode,
group % nilfs_palloc_groups_per_desc_block(inode);
}
-static unsigned char *
-nilfs_palloc_block_get_bitmap(const struct inode *inode,
- const struct buffer_head *bh, void *kaddr)
-{
- return (unsigned char *)(kaddr + bh_offset(bh));
-}
-
void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr,
const struct buffer_head *bh, void *kaddr)
{
@@ -289,8 +328,7 @@ int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
if (ret < 0)
goto out_desc;
bitmap_kaddr = kmap(bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(
- inode, bitmap_bh, bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
pos = nilfs_palloc_find_available_slot(
inode, group, group_offset, bitmap,
entries_per_group);
@@ -351,8 +389,7 @@ void nilfs_palloc_commit_free_entry(struct inode *inode,
desc = nilfs_palloc_block_get_group_desc(inode, group,
req->pr_desc_bh, desc_kaddr);
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(inode, req->pr_bitmap_bh,
- bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
group_offset, bitmap))
@@ -385,8 +422,7 @@ void nilfs_palloc_abort_alloc_entry(struct inode *inode,
desc = nilfs_palloc_block_get_group_desc(inode, group,
req->pr_desc_bh, desc_kaddr);
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(inode, req->pr_bitmap_bh,
- bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
group_offset, bitmap))
printk(KERN_WARNING "%s: entry numer %llu already freed\n",
@@ -472,8 +508,7 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
desc = nilfs_palloc_block_get_group_desc(
inode, group, desc_bh, desc_kaddr);
bitmap_kaddr = kmap(bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(
- inode, bitmap_bh, bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
for (j = i, n = 0;
(j < nitems) && nilfs_palloc_group_is_in(inode, group,
entry_nrs[j]);
@@ -502,3 +537,30 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
}
return 0;
}
+
+void nilfs_palloc_setup_cache(struct inode *inode,
+ struct nilfs_palloc_cache *cache)
+{
+ NILFS_MDT(inode)->mi_palloc_cache = cache;
+ spin_lock_init(&cache->lock);
+}
+
+void nilfs_palloc_clear_cache(struct inode *inode)
+{
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ spin_lock(&cache->lock);
+ brelse(cache->prev_desc.bh);
+ brelse(cache->prev_bitmap.bh);
+ brelse(cache->prev_entry.bh);
+ cache->prev_desc.bh = NULL;
+ cache->prev_bitmap.bh = NULL;
+ cache->prev_entry.bh = NULL;
+ spin_unlock(&cache->lock);
+}
+
+void nilfs_palloc_destroy_cache(struct inode *inode)
+{
+ nilfs_palloc_clear_cache(inode);
+ NILFS_MDT(inode)->mi_palloc_cache = NULL;
+}
diff --git a/fs/nilfs2/alloc.h b/fs/nilfs2/alloc.h
index 4ace5475..f4543ac 100644
--- a/fs/nilfs2/alloc.h
+++ b/fs/nilfs2/alloc.h
@@ -69,4 +69,25 @@ int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
#define nilfs_find_next_zero_bit ext2_find_next_zero_bit
+/*
+ * persistent object allocator cache
+ */
+
+struct nilfs_bh_assoc {
+ unsigned long blkoff;
+ struct buffer_head *bh;
+};
+
+struct nilfs_palloc_cache {
+ spinlock_t lock;
+ struct nilfs_bh_assoc prev_desc;
+ struct nilfs_bh_assoc prev_bitmap;
+ struct nilfs_bh_assoc prev_entry;
+};
+
+void nilfs_palloc_setup_cache(struct inode *inode,
+ struct nilfs_palloc_cache *cache);
+void nilfs_palloc_clear_cache(struct inode *inode);
+void nilfs_palloc_destroy_cache(struct inode *inode);
+
#endif /* _NILFS_ALLOC_H */
diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c
index 08834df..f4a14ea 100644
--- a/fs/nilfs2/bmap.c
+++ b/fs/nilfs2/bmap.c
@@ -402,19 +402,11 @@ int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
void nilfs_bmap_add_blocks(const struct nilfs_bmap *bmap, int n)
{
inode_add_bytes(bmap->b_inode, (1 << bmap->b_inode->i_blkbits) * n);
- if (NILFS_MDT(bmap->b_inode))
- nilfs_mdt_mark_dirty(bmap->b_inode);
- else
- mark_inode_dirty(bmap->b_inode);
}
void nilfs_bmap_sub_blocks(const struct nilfs_bmap *bmap, int n)
{
inode_sub_bytes(bmap->b_inode, (1 << bmap->b_inode->i_blkbits) * n);
- if (NILFS_MDT(bmap->b_inode))
- nilfs_mdt_mark_dirty(bmap->b_inode);
- else
- mark_inode_dirty(bmap->b_inode);
}
__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 84c2538..471e269 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -68,9 +68,34 @@ void nilfs_btnode_cache_clear(struct address_space *btnc)
truncate_inode_pages(btnc, 0);
}
+struct buffer_head *
+nilfs_btnode_create_block(struct address_space *btnc, __u64 blocknr)
+{
+ struct inode *inode = NILFS_BTNC_I(btnc);
+ struct buffer_head *bh;
+
+ bh = nilfs_grab_buffer(inode, btnc, blocknr, 1 << BH_NILFS_Node);
+ if (unlikely(!bh))
+ return NULL;
+
+ if (unlikely(buffer_mapped(bh) || buffer_uptodate(bh) ||
+ buffer_dirty(bh))) {
+ brelse(bh);
+ BUG();
+ }
+ memset(bh->b_data, 0, 1 << inode->i_blkbits);
+ bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
+ bh->b_blocknr = blocknr;
+ set_buffer_mapped(bh);
+ set_buffer_uptodate(bh);
+
+ unlock_page(bh->b_page);
+ page_cache_release(bh->b_page);
+ return bh;
+}
+
int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
- sector_t pblocknr, struct buffer_head **pbh,
- int newblk)
+ sector_t pblocknr, struct buffer_head **pbh)
{
struct buffer_head *bh;
struct inode *inode = NILFS_BTNC_I(btnc);
@@ -81,19 +106,6 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
return -ENOMEM;
err = -EEXIST; /* internal code */
- if (newblk) {
- if (unlikely(buffer_mapped(bh) || buffer_uptodate(bh) ||
- buffer_dirty(bh))) {
- brelse(bh);
- BUG();
- }
- memset(bh->b_data, 0, 1 << inode->i_blkbits);
- bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
- bh->b_blocknr = blocknr;
- set_buffer_mapped(bh);
- set_buffer_uptodate(bh);
- goto found;
- }
if (buffer_uptodate(bh) || buffer_dirty(bh))
goto found;
@@ -135,27 +147,6 @@ out_locked:
return err;
}
-int nilfs_btnode_get(struct address_space *btnc, __u64 blocknr,
- sector_t pblocknr, struct buffer_head **pbh, int newblk)
-{
- struct buffer_head *bh;
- int err;
-
- err = nilfs_btnode_submit_block(btnc, blocknr, pblocknr, pbh, newblk);
- if (err == -EEXIST) /* internal code (cache hit) */
- return 0;
- if (unlikely(err))
- return err;
-
- bh = *pbh;
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh)) {
- brelse(bh);
- return -EIO;
- }
- return 0;
-}
-
/**
* nilfs_btnode_delete - delete B-tree node buffer
* @bh: buffer to be deleted
@@ -244,12 +235,13 @@ retry:
unlock_page(obh->b_page);
}
- err = nilfs_btnode_get(btnc, newkey, 0, &nbh, 1);
- if (likely(!err)) {
- BUG_ON(nbh == obh);
- ctxt->newbh = nbh;
- }
- return err;
+ nbh = nilfs_btnode_create_block(btnc, newkey);
+ if (!nbh)
+ return -ENOMEM;
+
+ BUG_ON(nbh == obh);
+ ctxt->newbh = nbh;
+ return 0;
failed_unlock:
unlock_page(obh->b_page);
diff --git a/fs/nilfs2/btnode.h b/fs/nilfs2/btnode.h
index 3e22751..07da83f 100644
--- a/fs/nilfs2/btnode.h
+++ b/fs/nilfs2/btnode.h
@@ -40,10 +40,10 @@ struct nilfs_btnode_chkey_ctxt {
void nilfs_btnode_cache_init_once(struct address_space *);
void nilfs_btnode_cache_init(struct address_space *, struct backing_dev_info *);
void nilfs_btnode_cache_clear(struct address_space *);
+struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
+ __u64 blocknr);
int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t,
- struct buffer_head **, int);
-int nilfs_btnode_get(struct address_space *, __u64, sector_t,
- struct buffer_head **, int);
+ struct buffer_head **);
void nilfs_btnode_delete(struct buffer_head *);
int nilfs_btnode_prepare_change_key(struct address_space *,
struct nilfs_btnode_chkey_ctxt *);
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index e25b507..7cdd98b 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -114,7 +114,18 @@ static int nilfs_btree_get_block(const struct nilfs_btree *btree, __u64 ptr,
{
struct address_space *btnc =
&NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache;
- return nilfs_btnode_get(btnc, ptr, 0, bhp, 0);
+ int err;
+
+ err = nilfs_btnode_submit_block(btnc, ptr, 0, bhp);
+ if (err)
+ return err == -EEXIST ? 0 : err;
+
+ wait_on_buffer(*bhp);
+ if (!buffer_uptodate(*bhp)) {
+ brelse(*bhp);
+ return -EIO;
+ }
+ return 0;
}
static int nilfs_btree_get_new_block(const struct nilfs_btree *btree,
@@ -122,12 +133,15 @@ static int nilfs_btree_get_new_block(const struct nilfs_btree *btree,
{
struct address_space *btnc =
&NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache;
- int ret;
+ struct buffer_head *bh;
- ret = nilfs_btnode_get(btnc, ptr, 0, bhp, 1);
- if (!ret)
- set_buffer_nilfs_volatile(*bhp);
- return ret;
+ bh = nilfs_btnode_create_block(btnc, ptr);
+ if (!bh)
+ return -ENOMEM;
+
+ set_buffer_nilfs_volatile(bh);
+ *bhp = bh;
+ return 0;
}
static inline int
@@ -444,6 +458,18 @@ nilfs_btree_get_node(const struct nilfs_btree *btree,
nilfs_btree_get_nonroot_node(path, level);
}
+static inline int
+nilfs_btree_bad_node(struct nilfs_btree_node *node, int level)
+{
+ if (unlikely(nilfs_btree_node_get_level(node) != level)) {
+ dump_stack();
+ printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n",
+ nilfs_btree_node_get_level(node), level);
+ return 1;
+ }
+ return 0;
+}
+
static int nilfs_btree_do_lookup(const struct nilfs_btree *btree,
struct nilfs_btree_path *path,
__u64 key, __u64 *ptrp, int minlevel)
@@ -467,7 +493,8 @@ static int nilfs_btree_do_lookup(const struct nilfs_btree *btree,
if (ret < 0)
return ret;
node = nilfs_btree_get_nonroot_node(path, level);
- BUG_ON(level != nilfs_btree_node_get_level(node));
+ if (nilfs_btree_bad_node(node, level))
+ return -EINVAL;
if (!found)
found = nilfs_btree_node_lookup(node, key, &index);
else
@@ -512,7 +539,8 @@ static int nilfs_btree_do_lookup_last(const struct nilfs_btree *btree,
if (ret < 0)
return ret;
node = nilfs_btree_get_nonroot_node(path, level);
- BUG_ON(level != nilfs_btree_node_get_level(node));
+ if (nilfs_btree_bad_node(node, level))
+ return -EINVAL;
index = nilfs_btree_node_get_nchildren(node) - 1;
ptr = nilfs_btree_node_get_ptr(btree, node, index);
path[level].bp_index = index;
@@ -638,13 +666,11 @@ static void nilfs_btree_promote_key(struct nilfs_btree *btree,
{
if (level < nilfs_btree_height(btree) - 1) {
do {
- lock_buffer(path[level].bp_bh);
nilfs_btree_node_set_key(
nilfs_btree_get_nonroot_node(path, level),
path[level].bp_index, key);
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
} while ((path[level].bp_index == 0) &&
(++level < nilfs_btree_height(btree) - 1));
}
@@ -663,13 +689,11 @@ static void nilfs_btree_do_insert(struct nilfs_btree *btree,
struct nilfs_btree_node *node;
if (level < nilfs_btree_height(btree) - 1) {
- lock_buffer(path[level].bp_bh);
node = nilfs_btree_get_nonroot_node(path, level);
nilfs_btree_node_insert(btree, node, *keyp, *ptrp,
path[level].bp_index);
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
if (path[level].bp_index == 0)
nilfs_btree_promote_key(btree, path, level + 1,
@@ -689,9 +713,6 @@ static void nilfs_btree_carry_left(struct nilfs_btree *btree,
struct nilfs_btree_node *node, *left;
int nchildren, lnchildren, n, move;
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
left = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -712,9 +733,6 @@ static void nilfs_btree_carry_left(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(node, 0));
@@ -740,9 +758,6 @@ static void nilfs_btree_carry_right(struct nilfs_btree *btree,
struct nilfs_btree_node *node, *right;
int nchildren, rnchildren, n, move;
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -763,9 +778,6 @@ static void nilfs_btree_carry_right(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
path[level + 1].bp_index++;
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(right, 0));
@@ -794,9 +806,6 @@ static void nilfs_btree_split(struct nilfs_btree *btree,
__u64 newptr;
int nchildren, n, move;
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -815,9 +824,6 @@ static void nilfs_btree_split(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
newkey = nilfs_btree_node_get_key(right, 0);
newptr = path[level].bp_newreq.bpr_ptr;
@@ -852,8 +858,6 @@ static void nilfs_btree_grow(struct nilfs_btree *btree,
struct nilfs_btree_node *root, *child;
int n;
- lock_buffer(path[level].bp_sib_bh);
-
root = nilfs_btree_get_root(btree);
child = nilfs_btree_get_sib_node(path, level);
@@ -865,8 +869,6 @@ static void nilfs_btree_grow(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
path[level].bp_bh = path[level].bp_sib_bh;
path[level].bp_sib_bh = NULL;
@@ -1023,11 +1025,9 @@ static int nilfs_btree_prepare_insert(struct nilfs_btree *btree,
stats->bs_nblocks++;
- lock_buffer(bh);
nilfs_btree_node_init(btree,
(struct nilfs_btree_node *)bh->b_data,
0, level, 0, NULL, NULL);
- unlock_buffer(bh);
path[level].bp_sib_bh = bh;
path[level].bp_op = nilfs_btree_split;
}
@@ -1052,10 +1052,8 @@ static int nilfs_btree_prepare_insert(struct nilfs_btree *btree,
if (ret < 0)
goto err_out_curr_node;
- lock_buffer(bh);
nilfs_btree_node_init(btree, (struct nilfs_btree_node *)bh->b_data,
0, level, 0, NULL, NULL);
- unlock_buffer(bh);
path[level].bp_sib_bh = bh;
path[level].bp_op = nilfs_btree_grow;
@@ -1154,13 +1152,11 @@ static void nilfs_btree_do_delete(struct nilfs_btree *btree,
struct nilfs_btree_node *node;
if (level < nilfs_btree_height(btree) - 1) {
- lock_buffer(path[level].bp_bh);
node = nilfs_btree_get_nonroot_node(path, level);
nilfs_btree_node_delete(btree, node, keyp, ptrp,
path[level].bp_index);
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
if (path[level].bp_index == 0)
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(node, 0));
@@ -1180,9 +1176,6 @@ static void nilfs_btree_borrow_left(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
left = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -1197,9 +1190,6 @@ static void nilfs_btree_borrow_left(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(node, 0));
@@ -1217,9 +1207,6 @@ static void nilfs_btree_borrow_right(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -1234,9 +1221,6 @@ static void nilfs_btree_borrow_right(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
path[level + 1].bp_index++;
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(right, 0));
@@ -1255,9 +1239,6 @@ static void nilfs_btree_concat_left(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
left = nilfs_btree_get_sib_node(path, level);
@@ -1268,9 +1249,6 @@ static void nilfs_btree_concat_left(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btnode_delete(path[level].bp_bh);
path[level].bp_bh = path[level].bp_sib_bh;
path[level].bp_sib_bh = NULL;
@@ -1286,9 +1264,6 @@ static void nilfs_btree_concat_right(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
@@ -1299,9 +1274,6 @@ static void nilfs_btree_concat_right(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btnode_delete(path[level].bp_sib_bh);
path[level].bp_sib_bh = NULL;
path[level + 1].bp_index++;
@@ -1316,7 +1288,6 @@ static void nilfs_btree_shrink(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
root = nilfs_btree_get_root(btree);
child = nilfs_btree_get_nonroot_node(path, level);
@@ -1324,7 +1295,6 @@ static void nilfs_btree_shrink(struct nilfs_btree *btree,
nilfs_btree_node_set_level(root, level);
n = nilfs_btree_node_get_nchildren(child);
nilfs_btree_node_move_left(btree, root, child, n);
- unlock_buffer(path[level].bp_bh);
nilfs_btnode_delete(path[level].bp_bh);
path[level].bp_bh = NULL;
@@ -1699,7 +1669,6 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,
nilfs_bmap_commit_alloc_ptr(bmap, nreq, dat);
/* create child node at level 1 */
- lock_buffer(bh);
node = (struct nilfs_btree_node *)bh->b_data;
nilfs_btree_node_init(btree, node, 0, 1, n, keys, ptrs);
nilfs_btree_node_insert(btree, node,
@@ -1709,7 +1678,6 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,
if (!nilfs_bmap_dirty(bmap))
nilfs_bmap_set_dirty(bmap);
- unlock_buffer(bh);
brelse(bh);
/* create root node at level 2 */
@@ -2050,7 +2018,7 @@ static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *bmap,
for (level = NILFS_BTREE_LEVEL_NODE_MIN;
level < NILFS_BTREE_LEVEL_MAX;
level++)
- list_splice(&lists[level], listp->prev);
+ list_splice_tail(&lists[level], listp);
}
static int nilfs_btree_assign_p(struct nilfs_btree *btree,
diff --git a/fs/nilfs2/btree.h b/fs/nilfs2/btree.h
index 0e72bbb..4b82d84 100644
--- a/fs/nilfs2/btree.h
+++ b/fs/nilfs2/btree.h
@@ -34,28 +34,6 @@ struct nilfs_btree;
struct nilfs_btree_path;
/**
- * struct nilfs_btree_node - B-tree node
- * @bn_flags: flags
- * @bn_level: level
- * @bn_nchildren: number of children
- * @bn_pad: padding
- */
-struct nilfs_btree_node {
- __u8 bn_flags;
- __u8 bn_level;
- __le16 bn_nchildren;
- __le32 bn_pad;
-};
-
-/* flags */
-#define NILFS_BTREE_NODE_ROOT 0x01
-
-/* level */
-#define NILFS_BTREE_LEVEL_DATA 0
-#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
-#define NILFS_BTREE_LEVEL_MAX 14
-
-/**
* struct nilfs_btree - B-tree structure
* @bt_bmap: bmap base structure
*/
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index 3f5d5d0..d5ad54e 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -926,3 +926,29 @@ int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
up_read(&NILFS_MDT(cpfile)->mi_sem);
return ret;
}
+
+/**
+ * nilfs_cpfile_read - read cpfile inode
+ * @cpfile: cpfile inode
+ * @raw_inode: on-disk cpfile inode
+ */
+int nilfs_cpfile_read(struct inode *cpfile, struct nilfs_inode *raw_inode)
+{
+ return nilfs_read_inode_common(cpfile, raw_inode);
+}
+
+/**
+ * nilfs_cpfile_new - create cpfile
+ * @nilfs: nilfs object
+ * @cpsize: size of a checkpoint entry
+ */
+struct inode *nilfs_cpfile_new(struct the_nilfs *nilfs, size_t cpsize)
+{
+ struct inode *cpfile;
+
+ cpfile = nilfs_mdt_new(nilfs, NULL, NILFS_CPFILE_INO, 0);
+ if (cpfile)
+ nilfs_mdt_set_entry_size(cpfile, cpsize,
+ sizeof(struct nilfs_cpfile_header));
+ return cpfile;
+}
diff --git a/fs/nilfs2/cpfile.h b/fs/nilfs2/cpfile.h
index debea89..bc0809e 100644
--- a/fs/nilfs2/cpfile.h
+++ b/fs/nilfs2/cpfile.h
@@ -40,4 +40,7 @@ int nilfs_cpfile_get_stat(struct inode *, struct nilfs_cpstat *);
ssize_t nilfs_cpfile_get_cpinfo(struct inode *, __u64 *, int, void *, unsigned,
size_t);
+int nilfs_cpfile_read(struct inode *cpfile, struct nilfs_inode *raw_inode);
+struct inode *nilfs_cpfile_new(struct the_nilfs *nilfs, size_t cpsize);
+
#endif /* _NILFS_CPFILE_H */
diff --git a/fs/nilfs2/dat.c b/fs/nilfs2/dat.c
index 1ff8e15..187dd07 100644
--- a/fs/nilfs2/dat.c
+++ b/fs/nilfs2/dat.c
@@ -33,6 +33,16 @@
#define NILFS_CNO_MIN ((__u64)1)
#define NILFS_CNO_MAX (~(__u64)0)
+struct nilfs_dat_info {
+ struct nilfs_mdt_info mi;
+ struct nilfs_palloc_cache palloc_cache;
+};
+
+static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat)
+{
+ return (struct nilfs_dat_info *)NILFS_MDT(dat);
+}
+
static int nilfs_dat_prepare_entry(struct inode *dat,
struct nilfs_palloc_req *req, int create)
{
@@ -425,3 +435,40 @@ ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned visz,
return nvi;
}
+
+/**
+ * nilfs_dat_read - read dat inode
+ * @dat: dat inode
+ * @raw_inode: on-disk dat inode
+ */
+int nilfs_dat_read(struct inode *dat, struct nilfs_inode *raw_inode)
+{
+ return nilfs_read_inode_common(dat, raw_inode);
+}
+
+/**
+ * nilfs_dat_new - create dat file
+ * @nilfs: nilfs object
+ * @entry_size: size of a dat entry
+ */
+struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size)
+{
+ static struct lock_class_key dat_lock_key;
+ struct inode *dat;
+ struct nilfs_dat_info *di;
+ int err;
+
+ dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO, sizeof(*di));
+ if (dat) {
+ err = nilfs_palloc_init_blockgroup(dat, entry_size);
+ if (unlikely(err)) {
+ nilfs_mdt_destroy(dat);
+ return NULL;
+ }
+
+ di = NILFS_DAT_I(dat);
+ lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
+ nilfs_palloc_setup_cache(dat, &di->palloc_cache);
+ }
+ return dat;
+}
diff --git a/fs/nilfs2/dat.h b/fs/nilfs2/dat.h
index 406070d..d31c3aa 100644
--- a/fs/nilfs2/dat.h
+++ b/fs/nilfs2/dat.h
@@ -53,4 +53,7 @@ int nilfs_dat_freev(struct inode *, __u64 *, size_t);
int nilfs_dat_move(struct inode *, __u64, sector_t);
ssize_t nilfs_dat_get_vinfo(struct inode *, void *, unsigned, size_t);
+int nilfs_dat_read(struct inode *dat, struct nilfs_inode *raw_inode);
+struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size);
+
#endif /* _NILFS_DAT_H */
diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index e097099..76d803e 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -99,9 +99,9 @@ static int nilfs_prepare_chunk(struct page *page,
NULL, nilfs_get_block);
}
-static int nilfs_commit_chunk(struct page *page,
- struct address_space *mapping,
- unsigned from, unsigned to)
+static void nilfs_commit_chunk(struct page *page,
+ struct address_space *mapping,
+ unsigned from, unsigned to)
{
struct inode *dir = mapping->host;
struct nilfs_sb_info *sbi = NILFS_SB(dir->i_sb);
@@ -112,15 +112,13 @@ static int nilfs_commit_chunk(struct page *page,
nr_dirty = nilfs_page_count_clean_buffers(page, from, to);
copied = block_write_end(NULL, mapping, pos, len, len, page, NULL);
- if (pos + copied > dir->i_size) {
+ if (pos + copied > dir->i_size)
i_size_write(dir, pos + copied);
- mark_inode_dirty(dir);
- }
if (IS_DIRSYNC(dir))
nilfs_set_transaction_flag(NILFS_TI_SYNC);
err = nilfs_set_file_dirty(sbi, dir, nr_dirty);
+ WARN_ON(err); /* do not happen */
unlock_page(page);
- return err;
}
static void nilfs_check_page(struct page *page)
@@ -455,11 +453,10 @@ void nilfs_set_link(struct inode *dir, struct nilfs_dir_entry *de,
BUG_ON(err);
de->inode = cpu_to_le64(inode->i_ino);
nilfs_set_de_type(de, inode);
- err = nilfs_commit_chunk(page, mapping, from, to);
+ nilfs_commit_chunk(page, mapping, from, to);
nilfs_put_page(page);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
/* NILFS_I(dir)->i_flags &= ~NILFS_BTREE_FL; */
- mark_inode_dirty(dir);
}
/*
@@ -548,10 +545,10 @@ got_it:
memcpy(de->name, name, namelen);
de->inode = cpu_to_le64(inode->i_ino);
nilfs_set_de_type(de, inode);
- err = nilfs_commit_chunk(page, page->mapping, from, to);
+ nilfs_commit_chunk(page, page->mapping, from, to);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
/* NILFS_I(dir)->i_flags &= ~NILFS_BTREE_FL; */
- mark_inode_dirty(dir);
+ nilfs_mark_inode_dirty(dir);
/* OFFSET_CACHE */
out_put:
nilfs_put_page(page);
@@ -595,10 +592,9 @@ int nilfs_delete_entry(struct nilfs_dir_entry *dir, struct page *page)
if (pde)
pde->rec_len = cpu_to_le16(to - from);
dir->inode = 0;
- err = nilfs_commit_chunk(page, mapping, from, to);
+ nilfs_commit_chunk(page, mapping, from, to);
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
/* NILFS_I(inode)->i_flags &= ~NILFS_BTREE_FL; */
- mark_inode_dirty(inode);
out:
nilfs_put_page(page);
return err;
@@ -640,7 +636,7 @@ int nilfs_make_empty(struct inode *inode, struct inode *parent)
memcpy(de->name, "..\0", 4);
nilfs_set_de_type(de, inode);
kunmap_atomic(kaddr, KM_USER0);
- err = nilfs_commit_chunk(page, mapping, 0, chunk_size);
+ nilfs_commit_chunk(page, mapping, 0, chunk_size);
fail:
page_cache_release(page);
return err;
diff --git a/fs/nilfs2/gcdat.c b/fs/nilfs2/gcdat.c
index 93383c5..dd5f7e0 100644
--- a/fs/nilfs2/gcdat.c
+++ b/fs/nilfs2/gcdat.c
@@ -61,6 +61,8 @@ void nilfs_commit_gcdat_inode(struct the_nilfs *nilfs)
nilfs_bmap_commit_gcdat(gii->i_bmap, dii->i_bmap);
+ nilfs_palloc_clear_cache(dat);
+ nilfs_palloc_clear_cache(gcdat);
nilfs_clear_dirty_pages(mapping);
nilfs_copy_back_pages(mapping, gmapping);
/* note: mdt dirty flags should be cleared by segctor. */
@@ -79,6 +81,7 @@ void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs)
gcdat->i_state = I_CLEAR;
gii->i_flags = 0;
+ nilfs_palloc_clear_cache(gcdat);
truncate_inode_pages(gcdat->i_mapping, 0);
truncate_inode_pages(&gii->i_btnode_cache, 0);
}
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index e6de0a2..e16a666 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -149,7 +149,7 @@ int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
__u64 vbn, struct buffer_head **out_bh)
{
int ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
- vbn ? : pbn, pbn, out_bh, 0);
+ vbn ? : pbn, pbn, out_bh);
if (ret == -EEXIST) /* internal code (cache hit) */
ret = 0;
return ret;
@@ -212,9 +212,10 @@ void nilfs_destroy_gccache(struct the_nilfs *nilfs)
static struct inode *alloc_gcinode(struct the_nilfs *nilfs, ino_t ino,
__u64 cno)
{
- struct inode *inode = nilfs_mdt_new_common(nilfs, NULL, ino, GFP_NOFS);
+ struct inode *inode;
struct nilfs_inode_info *ii;
+ inode = nilfs_mdt_new_common(nilfs, NULL, ino, GFP_NOFS, 0);
if (!inode)
return NULL;
@@ -265,7 +266,6 @@ struct inode *nilfs_gc_iget(struct the_nilfs *nilfs, ino_t ino, __u64 cno)
*/
void nilfs_clear_gcinode(struct inode *inode)
{
- nilfs_mdt_clear(inode);
nilfs_mdt_destroy(inode);
}
diff --git a/fs/nilfs2/ifile.c b/fs/nilfs2/ifile.c
index de86401..922d9dd 100644
--- a/fs/nilfs2/ifile.c
+++ b/fs/nilfs2/ifile.c
@@ -29,6 +29,17 @@
#include "alloc.h"
#include "ifile.h"
+
+struct nilfs_ifile_info {
+ struct nilfs_mdt_info mi;
+ struct nilfs_palloc_cache palloc_cache;
+};
+
+static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
+{
+ return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
+}
+
/**
* nilfs_ifile_create_inode - create a new disk inode
* @ifile: ifile inode
@@ -148,3 +159,27 @@ int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
}
return err;
}
+
+/**
+ * nilfs_ifile_new - create inode file
+ * @sbi: nilfs_sb_info struct
+ * @inode_size: size of an inode
+ */
+struct inode *nilfs_ifile_new(struct nilfs_sb_info *sbi, size_t inode_size)
+{
+ struct inode *ifile;
+ int err;
+
+ ifile = nilfs_mdt_new(sbi->s_nilfs, sbi->s_super, NILFS_IFILE_INO,
+ sizeof(struct nilfs_ifile_info));
+ if (ifile) {
+ err = nilfs_palloc_init_blockgroup(ifile, inode_size);
+ if (unlikely(err)) {
+ nilfs_mdt_destroy(ifile);
+ return NULL;
+ }
+ nilfs_palloc_setup_cache(ifile,
+ &NILFS_IFILE_I(ifile)->palloc_cache);
+ }
+ return ifile;
+}
diff --git a/fs/nilfs2/ifile.h b/fs/nilfs2/ifile.h
index ecc3ba76..cbca32e 100644
--- a/fs/nilfs2/ifile.h
+++ b/fs/nilfs2/ifile.h
@@ -49,4 +49,6 @@ int nilfs_ifile_create_inode(struct inode *, ino_t *, struct buffer_head **);
int nilfs_ifile_delete_inode(struct inode *, ino_t);
int nilfs_ifile_get_inode_block(struct inode *, ino_t, struct buffer_head **);
+struct inode *nilfs_ifile_new(struct nilfs_sb_info *sbi, size_t inode_size);
+
#endif /* _NILFS_IFILE_H */
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 2a0a5a3..7868cc1 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -97,6 +97,7 @@ int nilfs_get_block(struct inode *inode, sector_t blkoff,
nilfs_transaction_abort(inode->i_sb);
goto out;
}
+ nilfs_mark_inode_dirty(inode);
nilfs_transaction_commit(inode->i_sb); /* never fails */
/* Error handling should be detailed */
set_buffer_new(bh_result);
@@ -322,7 +323,6 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode)
nilfs_init_acl(), proper cancellation of
above jobs should be considered */
- mark_inode_dirty(inode);
return inode;
failed_acl:
@@ -525,7 +525,6 @@ void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh);
- /* The buffer is guarded with lock_buffer() by the caller */
if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size);
set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
@@ -599,6 +598,7 @@ void nilfs_truncate(struct inode *inode)
if (IS_SYNC(inode))
nilfs_set_transaction_flag(NILFS_TI_SYNC);
+ nilfs_mark_inode_dirty(inode);
nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
nilfs_transaction_commit(sb);
/* May construct a logical segment and may fail in sync mode.
@@ -623,6 +623,7 @@ void nilfs_delete_inode(struct inode *inode)
truncate_inode_pages(&inode->i_data, 0);
nilfs_truncate_bmap(ii, 0);
+ nilfs_mark_inode_dirty(inode);
nilfs_free_inode(inode);
/* nilfs_free_inode() marks inode buffer dirty */
if (IS_SYNC(inode))
@@ -745,9 +746,7 @@ int nilfs_mark_inode_dirty(struct inode *inode)
"failed to reget inode block.\n");
return err;
}
- lock_buffer(ibh);
nilfs_update_inode(inode, ibh);
- unlock_buffer(ibh);
nilfs_mdt_mark_buffer_dirty(ibh);
nilfs_mdt_mark_dirty(sbi->s_ifile);
brelse(ibh);
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index f632611..06713ff 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -186,7 +186,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
}
static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
- struct buffer_head **out_bh)
+ int readahead, struct buffer_head **out_bh)
{
struct buffer_head *first_bh, *bh;
unsigned long blkoff;
@@ -200,16 +200,18 @@ static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
if (unlikely(err))
goto failed;
- blkoff = block + 1;
- for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
- err = nilfs_mdt_submit_block(inode, blkoff, READA, &bh);
- if (likely(!err || err == -EEXIST))
- brelse(bh);
- else if (err != -EBUSY)
- break; /* abort readahead if bmap lookup failed */
-
- if (!buffer_locked(first_bh))
- goto out_no_wait;
+ if (readahead) {
+ blkoff = block + 1;
+ for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
+ err = nilfs_mdt_submit_block(inode, blkoff, READA, &bh);
+ if (likely(!err || err == -EEXIST))
+ brelse(bh);
+ else if (err != -EBUSY)
+ break;
+ /* abort readahead if bmap lookup failed */
+ if (!buffer_locked(first_bh))
+ goto out_no_wait;
+ }
}
wait_on_buffer(first_bh);
@@ -263,7 +265,7 @@ int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create,
/* Should be rewritten with merging nilfs_mdt_read_block() */
retry:
- ret = nilfs_mdt_read_block(inode, blkoff, out_bh);
+ ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh);
if (!create || ret != -ENOENT)
return ret;
@@ -371,7 +373,7 @@ int nilfs_mdt_mark_block_dirty(struct inode *inode, unsigned long block)
struct buffer_head *bh;
int err;
- err = nilfs_mdt_read_block(inode, block, &bh);
+ err = nilfs_mdt_read_block(inode, block, 0, &bh);
if (unlikely(err))
return err;
nilfs_mark_buffer_dirty(bh);
@@ -445,9 +447,17 @@ static const struct file_operations def_mdt_fops;
* longer than those of the super block structs; they may continue for
* several consecutive mounts/umounts. This would need discussions.
*/
+/**
+ * nilfs_mdt_new_common - allocate a pseudo inode for metadata file
+ * @nilfs: nilfs object
+ * @sb: super block instance the metadata file belongs to
+ * @ino: inode number
+ * @gfp_mask: gfp mask for data pages
+ * @objsz: size of the private object attached to inode->i_private
+ */
struct inode *
nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
- ino_t ino, gfp_t gfp_mask)
+ ino_t ino, gfp_t gfp_mask, size_t objsz)
{
struct inode *inode = nilfs_alloc_inode_common(nilfs);
@@ -455,8 +465,9 @@ nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
return NULL;
else {
struct address_space * const mapping = &inode->i_data;
- struct nilfs_mdt_info *mi = kzalloc(sizeof(*mi), GFP_NOFS);
+ struct nilfs_mdt_info *mi;
+ mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
if (!mi) {
nilfs_destroy_inode(inode);
return NULL;
@@ -513,11 +524,11 @@ nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
}
struct inode *nilfs_mdt_new(struct the_nilfs *nilfs, struct super_block *sb,
- ino_t ino)
+ ino_t ino, size_t objsz)
{
- struct inode *inode = nilfs_mdt_new_common(nilfs, sb, ino,
- NILFS_MDT_GFP);
+ struct inode *inode;
+ inode = nilfs_mdt_new_common(nilfs, sb, ino, NILFS_MDT_GFP, objsz);
if (!inode)
return NULL;
@@ -544,14 +555,15 @@ void nilfs_mdt_set_shadow(struct inode *orig, struct inode *shadow)
&NILFS_I(orig)->i_btnode_cache;
}
-void nilfs_mdt_clear(struct inode *inode)
+static void nilfs_mdt_clear(struct inode *inode)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
invalidate_mapping_pages(inode->i_mapping, 0, -1);
truncate_inode_pages(inode->i_mapping, 0);
- nilfs_bmap_clear(ii->i_bmap);
+ if (test_bit(NILFS_I_BMAP, &ii->i_state))
+ nilfs_bmap_clear(ii->i_bmap);
nilfs_btnode_cache_clear(&ii->i_btnode_cache);
}
@@ -559,6 +571,10 @@ void nilfs_mdt_destroy(struct inode *inode)
{
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
+ if (mdi->mi_palloc_cache)
+ nilfs_palloc_destroy_cache(inode);
+ nilfs_mdt_clear(inode);
+
kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
kfree(mdi);
nilfs_destroy_inode(inode);
diff --git a/fs/nilfs2/mdt.h b/fs/nilfs2/mdt.h
index 4315997..6c4bbb0 100644
--- a/fs/nilfs2/mdt.h
+++ b/fs/nilfs2/mdt.h
@@ -36,6 +36,7 @@
* @mi_entry_size: size of an entry
* @mi_first_entry_offset: offset to the first entry
* @mi_entries_per_block: number of entries in a block
+ * @mi_palloc_cache: persistent object allocator cache
* @mi_blocks_per_group: number of blocks in a group
* @mi_blocks_per_desc_block: number of blocks per descriptor block
*/
@@ -46,6 +47,7 @@ struct nilfs_mdt_info {
unsigned mi_entry_size;
unsigned mi_first_entry_offset;
unsigned long mi_entries_per_block;
+ struct nilfs_palloc_cache *mi_palloc_cache;
unsigned long mi_blocks_per_group;
unsigned long mi_blocks_per_desc_block;
};
@@ -74,11 +76,11 @@ int nilfs_mdt_forget_block(struct inode *, unsigned long);
int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
int nilfs_mdt_fetch_dirty(struct inode *);
-struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t);
+struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t,
+ size_t);
struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *,
- ino_t, gfp_t);
+ ino_t, gfp_t, size_t);
void nilfs_mdt_destroy(struct inode *);
-void nilfs_mdt_clear(struct inode *);
void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
void nilfs_mdt_set_shadow(struct inode *, struct inode *);
@@ -104,21 +106,4 @@ static inline __u64 nilfs_mdt_cno(struct inode *inode)
#define nilfs_mdt_bgl_lock(inode, bg) \
(&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
-
-static inline int
-nilfs_mdt_read_inode_direct(struct inode *inode, struct buffer_head *bh,
- unsigned n)
-{
- return nilfs_read_inode_common(
- inode, (struct nilfs_inode *)(bh->b_data + n));
-}
-
-static inline void
-nilfs_mdt_write_inode_direct(struct inode *inode, struct buffer_head *bh,
- unsigned n)
-{
- nilfs_write_inode_common(
- inode, (struct nilfs_inode *)(bh->b_data + n), 1);
-}
-
#endif /* _NILFS_MDT_H */
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index ed02e88..07ba838 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -120,7 +120,7 @@ static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode,
inode->i_op = &nilfs_file_inode_operations;
inode->i_fop = &nilfs_file_operations;
inode->i_mapping->a_ops = &nilfs_aops;
- mark_inode_dirty(inode);
+ nilfs_mark_inode_dirty(inode);
err = nilfs_add_nondir(dentry, inode);
}
if (!err)
@@ -148,7 +148,7 @@ nilfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
init_special_inode(inode, inode->i_mode, rdev);
- mark_inode_dirty(inode);
+ nilfs_mark_inode_dirty(inode);
err = nilfs_add_nondir(dentry, inode);
}
if (!err)
@@ -188,7 +188,7 @@ static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
goto out_fail;
/* mark_inode_dirty(inode); */
- /* nilfs_new_inode() and page_symlink() do this */
+ /* page_symlink() do this */
err = nilfs_add_nondir(dentry, inode);
out:
@@ -200,7 +200,8 @@ out:
return err;
out_fail:
- inode_dec_link_count(inode);
+ drop_nlink(inode);
+ nilfs_mark_inode_dirty(inode);
iput(inode);
goto out;
}
@@ -245,7 +246,7 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
if (err)
return err;
- inode_inc_link_count(dir);
+ inc_nlink(dir);
inode = nilfs_new_inode(dir, S_IFDIR | mode);
err = PTR_ERR(inode);
@@ -256,7 +257,7 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
inode->i_fop = &nilfs_dir_operations;
inode->i_mapping->a_ops = &nilfs_aops;
- inode_inc_link_count(inode);
+ inc_nlink(inode);
err = nilfs_make_empty(inode, dir);
if (err)
@@ -266,6 +267,7 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
if (err)
goto out_fail;
+ nilfs_mark_inode_dirty(inode);
d_instantiate(dentry, inode);
out:
if (!err)
@@ -276,26 +278,23 @@ out:
return err;
out_fail:
- inode_dec_link_count(inode);
- inode_dec_link_count(inode);
+ drop_nlink(inode);
+ drop_nlink(inode);
+ nilfs_mark_inode_dirty(inode);
iput(inode);
out_dir:
- inode_dec_link_count(dir);
+ drop_nlink(dir);
+ nilfs_mark_inode_dirty(dir);
goto out;
}
-static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
+static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode;
struct nilfs_dir_entry *de;
struct page *page;
- struct nilfs_transaction_info ti;
int err;
- err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
- if (err)
- return err;
-
err = -ENOENT;
de = nilfs_find_entry(dir, dentry, &page);
if (!de)
@@ -317,12 +316,28 @@ static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
goto out;
inode->i_ctime = dir->i_ctime;
- inode_dec_link_count(inode);
+ drop_nlink(inode);
err = 0;
out:
- if (!err)
+ return err;
+}
+
+static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct nilfs_transaction_info ti;
+ int err;
+
+ err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
+ if (err)
+ return err;
+
+ err = nilfs_do_unlink(dir, dentry);
+
+ if (!err) {
+ nilfs_mark_inode_dirty(dir);
+ nilfs_mark_inode_dirty(dentry->d_inode);
err = nilfs_transaction_commit(dir->i_sb);
- else
+ } else
nilfs_transaction_abort(dir->i_sb);
return err;
@@ -340,11 +355,13 @@ static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
err = -ENOTEMPTY;
if (nilfs_empty_dir(inode)) {
- err = nilfs_unlink(dir, dentry);
+ err = nilfs_do_unlink(dir, dentry);
if (!err) {
inode->i_size = 0;
- inode_dec_link_count(inode);
- inode_dec_link_count(dir);
+ drop_nlink(inode);
+ nilfs_mark_inode_dirty(inode);
+ drop_nlink(dir);
+ nilfs_mark_inode_dirty(dir);
}
}
if (!err)
@@ -395,42 +412,48 @@ static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
new_de = nilfs_find_entry(new_dir, new_dentry, &new_page);
if (!new_de)
goto out_dir;
- inode_inc_link_count(old_inode);
+ inc_nlink(old_inode);
nilfs_set_link(new_dir, new_de, new_page, old_inode);
+ nilfs_mark_inode_dirty(new_dir);
new_inode->i_ctime = CURRENT_TIME;
if (dir_de)
drop_nlink(new_inode);
- inode_dec_link_count(new_inode);
+ drop_nlink(new_inode);
+ nilfs_mark_inode_dirty(new_inode);
} else {
if (dir_de) {
err = -EMLINK;
if (new_dir->i_nlink >= NILFS_LINK_MAX)
goto out_dir;
}
- inode_inc_link_count(old_inode);
+ inc_nlink(old_inode);
err = nilfs_add_link(new_dentry, old_inode);
if (err) {
- inode_dec_link_count(old_inode);
+ drop_nlink(old_inode);
+ nilfs_mark_inode_dirty(old_inode);
goto out_dir;
}
- if (dir_de)
- inode_inc_link_count(new_dir);
+ if (dir_de) {
+ inc_nlink(new_dir);
+ nilfs_mark_inode_dirty(new_dir);
+ }
}
/*
* Like most other Unix systems, set the ctime for inodes on a
* rename.
- * inode_dec_link_count() will mark the inode dirty.
*/
old_inode->i_ctime = CURRENT_TIME;
nilfs_delete_entry(old_de, old_page);
- inode_dec_link_count(old_inode);
+ drop_nlink(old_inode);
if (dir_de) {
nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
- inode_dec_link_count(old_dir);
+ drop_nlink(old_dir);
}
+ nilfs_mark_inode_dirty(old_dir);
+ nilfs_mark_inode_dirty(old_inode);
err = nilfs_transaction_commit(old_dir->i_sb);
return err;
diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index 6dc8359..c9c96c7 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -770,14 +770,8 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
nilfs_finish_roll_forward(nilfs, sbi, ri);
}
- nilfs_detach_checkpoint(sbi);
- return 0;
-
failed:
nilfs_detach_checkpoint(sbi);
- nilfs_mdt_clear(nilfs->ns_cpfile);
- nilfs_mdt_clear(nilfs->ns_sufile);
- nilfs_mdt_clear(nilfs->ns_dat);
return err;
}
@@ -804,6 +798,7 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
struct nilfs_segsum_info ssi;
sector_t pseg_start, pseg_end, sr_pseg_start = 0;
sector_t seg_start, seg_end; /* range of full segment (block number) */
+ sector_t b, end;
u64 seg_seq;
__u64 segnum, nextnum = 0;
__u64 cno;
@@ -819,6 +814,11 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
/* Calculate range of segment */
nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
+ /* Read ahead segment */
+ b = seg_start;
+ while (b <= seg_end)
+ sb_breadahead(sbi->s_super, b++);
+
for (;;) {
/* Load segment summary */
ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi, 1);
@@ -841,14 +841,20 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
ri->ri_nextnum = nextnum;
empty_seg = 0;
+ if (!NILFS_SEG_HAS_SR(&ssi) && !scan_newer) {
+ /* This will never happen because a superblock
+ (last_segment) always points to a pseg
+ having a super root. */
+ ret = NILFS_SEG_FAIL_CONSISTENCY;
+ goto failed;
+ }
+
+ if (pseg_start == seg_start) {
+ nilfs_get_segment_range(nilfs, nextnum, &b, &end);
+ while (b <= end)
+ sb_breadahead(sbi->s_super, b++);
+ }
if (!NILFS_SEG_HAS_SR(&ssi)) {
- if (!scan_newer) {
- /* This will never happen because a superblock
- (last_segment) always points to a pseg
- having a super root. */
- ret = NILFS_SEG_FAIL_CONSISTENCY;
- goto failed;
- }
if (!ri->ri_lsegs_start && NILFS_SEG_LOGBGN(&ssi)) {
ri->ri_lsegs_start = pseg_start;
ri->ri_lsegs_start_seq = seg_seq;
@@ -919,7 +925,7 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
super_root_found:
/* Updating pointers relating to the latest checkpoint */
- list_splice(&segments, ri->ri_used_segments.prev);
+ list_splice_tail(&segments, &ri->ri_used_segments);
nilfs->ns_last_pseg = sr_pseg_start;
nilfs->ns_last_seq = nilfs->ns_seg_seq;
nilfs->ns_last_cno = ri->ri_cno;
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index e6d9e37..645c786 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -24,10 +24,22 @@
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/crc32.h>
+#include <linux/backing-dev.h>
#include "page.h"
#include "segbuf.h"
+struct nilfs_write_info {
+ struct the_nilfs *nilfs;
+ struct bio *bio;
+ int start, end; /* The region to be submitted */
+ int rest_blocks;
+ int max_pages;
+ int nr_vecs;
+ sector_t blocknr;
+};
+
+
static struct kmem_cache *nilfs_segbuf_cachep;
static void nilfs_segbuf_init_once(void *obj)
@@ -63,6 +75,11 @@ struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb)
INIT_LIST_HEAD(&segbuf->sb_list);
INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);
INIT_LIST_HEAD(&segbuf->sb_payload_buffers);
+
+ init_completion(&segbuf->sb_bio_event);
+ atomic_set(&segbuf->sb_err, 0);
+ segbuf->sb_nbio = 0;
+
return segbuf;
}
@@ -83,6 +100,22 @@ void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,
segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
}
+/**
+ * nilfs_segbuf_map_cont - map a new log behind a given log
+ * @segbuf: new segment buffer
+ * @prev: segment buffer containing a log to be continued
+ */
+void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_segment_buffer *prev)
+{
+ segbuf->sb_segnum = prev->sb_segnum;
+ segbuf->sb_fseg_start = prev->sb_fseg_start;
+ segbuf->sb_fseg_end = prev->sb_fseg_end;
+ segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks;
+ segbuf->sb_rest_blocks =
+ segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
+}
+
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,
__u64 nextnum, struct the_nilfs *nilfs)
{
@@ -132,8 +165,6 @@ int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned flags,
segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary);
segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0;
segbuf->sb_sum.ctime = ctime;
-
- segbuf->sb_io_error = 0;
return 0;
}
@@ -219,7 +250,7 @@ void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf,
raw_sum->ss_datasum = cpu_to_le32(crc);
}
-void nilfs_release_buffers(struct list_head *list)
+static void nilfs_release_buffers(struct list_head *list)
{
struct buffer_head *bh, *n;
@@ -241,13 +272,56 @@ void nilfs_release_buffers(struct list_head *list)
}
}
+static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
+{
+ nilfs_release_buffers(&segbuf->sb_segsum_buffers);
+ nilfs_release_buffers(&segbuf->sb_payload_buffers);
+}
+
+/*
+ * Iterators for segment buffers
+ */
+void nilfs_clear_logs(struct list_head *logs)
+{
+ struct nilfs_segment_buffer *segbuf;
+
+ list_for_each_entry(segbuf, logs, sb_list)
+ nilfs_segbuf_clear(segbuf);
+}
+
+void nilfs_truncate_logs(struct list_head *logs,
+ struct nilfs_segment_buffer *last)
+{
+ struct nilfs_segment_buffer *n, *segbuf;
+
+ segbuf = list_prepare_entry(last, logs, sb_list);
+ list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) {
+ list_del_init(&segbuf->sb_list);
+ nilfs_segbuf_clear(segbuf);
+ nilfs_segbuf_free(segbuf);
+ }
+}
+
+int nilfs_wait_on_logs(struct list_head *logs)
+{
+ struct nilfs_segment_buffer *segbuf;
+ int err;
+
+ list_for_each_entry(segbuf, logs, sb_list) {
+ err = nilfs_segbuf_wait(segbuf);
+ if (err)
+ return err;
+ }
+ return 0;
+}
+
/*
* BIO operations
*/
static void nilfs_end_bio_write(struct bio *bio, int err)
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- struct nilfs_write_info *wi = bio->bi_private;
+ struct nilfs_segment_buffer *segbuf = bio->bi_private;
if (err == -EOPNOTSUPP) {
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
@@ -256,21 +330,22 @@ static void nilfs_end_bio_write(struct bio *bio, int err)
}
if (!uptodate)
- atomic_inc(&wi->err);
+ atomic_inc(&segbuf->sb_err);
bio_put(bio);
- complete(&wi->bio_event);
+ complete(&segbuf->sb_bio_event);
}
-static int nilfs_submit_seg_bio(struct nilfs_write_info *wi, int mode)
+static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_write_info *wi, int mode)
{
struct bio *bio = wi->bio;
int err;
- if (wi->nbio > 0 && bdi_write_congested(wi->bdi)) {
- wait_for_completion(&wi->bio_event);
- wi->nbio--;
- if (unlikely(atomic_read(&wi->err))) {
+ if (segbuf->sb_nbio > 0 && bdi_write_congested(wi->nilfs->ns_bdi)) {
+ wait_for_completion(&segbuf->sb_bio_event);
+ segbuf->sb_nbio--;
+ if (unlikely(atomic_read(&segbuf->sb_err))) {
bio_put(bio);
err = -EIO;
goto failed;
@@ -278,7 +353,7 @@ static int nilfs_submit_seg_bio(struct nilfs_write_info *wi, int mode)
}
bio->bi_end_io = nilfs_end_bio_write;
- bio->bi_private = wi;
+ bio->bi_private = segbuf;
bio_get(bio);
submit_bio(mode, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
@@ -286,7 +361,7 @@ static int nilfs_submit_seg_bio(struct nilfs_write_info *wi, int mode)
err = -EOPNOTSUPP;
goto failed;
}
- wi->nbio++;
+ segbuf->sb_nbio++;
bio_put(bio);
wi->bio = NULL;
@@ -301,17 +376,15 @@ static int nilfs_submit_seg_bio(struct nilfs_write_info *wi, int mode)
}
/**
- * nilfs_alloc_seg_bio - allocate a bio for writing segment.
- * @sb: super block
- * @start: beginning disk block number of this BIO.
+ * nilfs_alloc_seg_bio - allocate a new bio for writing log
+ * @nilfs: nilfs object
+ * @start: start block number of the bio
* @nr_vecs: request size of page vector.
*
- * alloc_seg_bio() allocates a new BIO structure and initialize it.
- *
* Return Value: On success, pointer to the struct bio is returned.
* On error, NULL is returned.
*/
-static struct bio *nilfs_alloc_seg_bio(struct super_block *sb, sector_t start,
+static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start,
int nr_vecs)
{
struct bio *bio;
@@ -322,36 +395,33 @@ static struct bio *nilfs_alloc_seg_bio(struct super_block *sb, sector_t start,
bio = bio_alloc(GFP_NOIO, nr_vecs);
}
if (likely(bio)) {
- bio->bi_bdev = sb->s_bdev;
- bio->bi_sector = (sector_t)start << (sb->s_blocksize_bits - 9);
+ bio->bi_bdev = nilfs->ns_bdev;
+ bio->bi_sector = start << (nilfs->ns_blocksize_bits - 9);
}
return bio;
}
-void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,
- struct nilfs_write_info *wi)
+static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_write_info *wi)
{
wi->bio = NULL;
wi->rest_blocks = segbuf->sb_sum.nblocks;
- wi->max_pages = bio_get_nr_vecs(wi->sb->s_bdev);
+ wi->max_pages = bio_get_nr_vecs(wi->nilfs->ns_bdev);
wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
wi->start = wi->end = 0;
- wi->nbio = 0;
wi->blocknr = segbuf->sb_pseg_start;
-
- atomic_set(&wi->err, 0);
- init_completion(&wi->bio_event);
}
-static int nilfs_submit_bh(struct nilfs_write_info *wi, struct buffer_head *bh,
- int mode)
+static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_write_info *wi,
+ struct buffer_head *bh, int mode)
{
int len, err;
BUG_ON(wi->nr_vecs <= 0);
repeat:
if (!wi->bio) {
- wi->bio = nilfs_alloc_seg_bio(wi->sb, wi->blocknr + wi->end,
+ wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end,
wi->nr_vecs);
if (unlikely(!wi->bio))
return -ENOMEM;
@@ -363,76 +433,83 @@ static int nilfs_submit_bh(struct nilfs_write_info *wi, struct buffer_head *bh,
return 0;
}
/* bio is FULL */
- err = nilfs_submit_seg_bio(wi, mode);
+ err = nilfs_segbuf_submit_bio(segbuf, wi, mode);
/* never submit current bh */
if (likely(!err))
goto repeat;
return err;
}
+/**
+ * nilfs_segbuf_write - submit write requests of a log
+ * @segbuf: buffer storing a log to be written
+ * @nilfs: nilfs object
+ *
+ * Return Value: On Success, 0 is returned. On Error, one of the following
+ * negative error code is returned.
+ *
+ * %-EIO - I/O error
+ *
+ * %-ENOMEM - Insufficient memory available.
+ */
int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
- struct nilfs_write_info *wi)
+ struct the_nilfs *nilfs)
{
+ struct nilfs_write_info wi;
struct buffer_head *bh;
- int res, rw = WRITE;
+ int res = 0, rw = WRITE;
+
+ wi.nilfs = nilfs;
+ nilfs_segbuf_prepare_write(segbuf, &wi);
list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) {
- res = nilfs_submit_bh(wi, bh, rw);
+ res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
if (unlikely(res))
goto failed_bio;
}
list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
- res = nilfs_submit_bh(wi, bh, rw);
+ res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
if (unlikely(res))
goto failed_bio;
}
- if (wi->bio) {
+ if (wi.bio) {
/*
* Last BIO is always sent through the following
* submission.
*/
rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
- res = nilfs_submit_seg_bio(wi, rw);
- if (unlikely(res))
- goto failed_bio;
+ res = nilfs_segbuf_submit_bio(segbuf, &wi, rw);
}
- res = 0;
- out:
- return res;
-
failed_bio:
- atomic_inc(&wi->err);
- goto out;
+ return res;
}
/**
* nilfs_segbuf_wait - wait for completion of requested BIOs
- * @wi: nilfs_write_info
+ * @segbuf: segment buffer
*
* Return Value: On Success, 0 is returned. On Error, one of the following
* negative error code is returned.
*
* %-EIO - I/O error
*/
-int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf,
- struct nilfs_write_info *wi)
+int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf)
{
int err = 0;
- if (!wi->nbio)
+ if (!segbuf->sb_nbio)
return 0;
do {
- wait_for_completion(&wi->bio_event);
- } while (--wi->nbio > 0);
+ wait_for_completion(&segbuf->sb_bio_event);
+ } while (--segbuf->sb_nbio > 0);
- if (unlikely(atomic_read(&wi->err) > 0)) {
+ if (unlikely(atomic_read(&segbuf->sb_err) > 0)) {
printk(KERN_ERR "NILFS: IO error writing segment\n");
err = -EIO;
- segbuf->sb_io_error = 1;
}
return err;
}
diff --git a/fs/nilfs2/segbuf.h b/fs/nilfs2/segbuf.h
index 0c3076f..6af1630 100644
--- a/fs/nilfs2/segbuf.h
+++ b/fs/nilfs2/segbuf.h
@@ -27,7 +27,6 @@
#include <linux/buffer_head.h>
#include <linux/bio.h>
#include <linux/completion.h>
-#include <linux/backing-dev.h>
/**
* struct nilfs_segsum_info - On-memory segment summary
@@ -77,7 +76,9 @@ struct nilfs_segsum_info {
* @sb_rest_blocks: Number of residual blocks in the current segment
* @sb_segsum_buffers: List of buffers for segment summaries
* @sb_payload_buffers: List of buffers for segment payload
- * @sb_io_error: I/O error status
+ * @sb_nbio: Number of flying bio requests
+ * @sb_err: I/O error status
+ * @sb_bio_event: Completion event of log writing
*/
struct nilfs_segment_buffer {
struct super_block *sb_super;
@@ -96,7 +97,9 @@ struct nilfs_segment_buffer {
struct list_head sb_payload_buffers; /* including super root */
/* io status */
- int sb_io_error;
+ int sb_nbio;
+ atomic_t sb_err;
+ struct completion sb_bio_event;
};
#define NILFS_LIST_SEGBUF(head) \
@@ -125,6 +128,8 @@ struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *);
void nilfs_segbuf_free(struct nilfs_segment_buffer *);
void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
struct the_nilfs *);
+void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_segment_buffer *prev);
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
struct the_nilfs *);
int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t);
@@ -161,41 +166,18 @@ nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf,
segbuf->sb_sum.nfileblk++;
}
-void nilfs_release_buffers(struct list_head *);
+int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
+ struct the_nilfs *nilfs);
+int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);
-static inline void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
+void nilfs_clear_logs(struct list_head *logs);
+void nilfs_truncate_logs(struct list_head *logs,
+ struct nilfs_segment_buffer *last);
+int nilfs_wait_on_logs(struct list_head *logs);
+
+static inline void nilfs_destroy_logs(struct list_head *logs)
{
- nilfs_release_buffers(&segbuf->sb_segsum_buffers);
- nilfs_release_buffers(&segbuf->sb_payload_buffers);
+ nilfs_truncate_logs(logs, NULL);
}
-struct nilfs_write_info {
- struct bio *bio;
- int start, end; /* The region to be submitted */
- int rest_blocks;
- int max_pages;
- int nr_vecs;
- sector_t blocknr;
-
- int nbio;
- atomic_t err;
- struct completion bio_event;
- /* completion event of segment write */
-
- /*
- * The following fields must be set explicitly
- */
- struct super_block *sb;
- struct backing_dev_info *bdi; /* backing dev info */
- struct buffer_head *bh_sr;
-};
-
-
-void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *,
- struct nilfs_write_info *);
-int nilfs_segbuf_write(struct nilfs_segment_buffer *,
- struct nilfs_write_info *);
-int nilfs_segbuf_wait(struct nilfs_segment_buffer *,
- struct nilfs_write_info *);
-
#endif /* _NILFS_SEGBUF_H */
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 6eff66a..17584c5 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -974,12 +974,12 @@ static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
raw_sr->sr_flags = 0;
- nilfs_mdt_write_inode_direct(
- nilfs_dat_inode(nilfs), bh_sr, NILFS_SR_DAT_OFFSET(isz));
- nilfs_mdt_write_inode_direct(
- nilfs->ns_cpfile, bh_sr, NILFS_SR_CPFILE_OFFSET(isz));
- nilfs_mdt_write_inode_direct(
- nilfs->ns_sufile, bh_sr, NILFS_SR_SUFILE_OFFSET(isz));
+ nilfs_write_inode_common(nilfs_dat_inode(nilfs), (void *)raw_sr +
+ NILFS_SR_DAT_OFFSET(isz), 1);
+ nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr +
+ NILFS_SR_CPFILE_OFFSET(isz), 1);
+ nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
+ NILFS_SR_SUFILE_OFFSET(isz), 1);
}
static void nilfs_redirty_inodes(struct list_head *head)
@@ -1273,73 +1273,75 @@ static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
return err;
}
-static int nilfs_touch_segusage(struct inode *sufile, __u64 segnum)
-{
- struct buffer_head *bh_su;
- struct nilfs_segment_usage *raw_su;
- int err;
-
- err = nilfs_sufile_get_segment_usage(sufile, segnum, &raw_su, &bh_su);
- if (unlikely(err))
- return err;
- nilfs_mdt_mark_buffer_dirty(bh_su);
- nilfs_mdt_mark_dirty(sufile);
- nilfs_sufile_put_segment_usage(sufile, segnum, bh_su);
- return 0;
-}
-
+/**
+ * nilfs_segctor_begin_construction - setup segment buffer to make a new log
+ * @sci: nilfs_sc_info
+ * @nilfs: nilfs object
+ */
static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
struct the_nilfs *nilfs)
{
- struct nilfs_segment_buffer *segbuf, *n;
+ struct nilfs_segment_buffer *segbuf, *prev;
__u64 nextnum;
- int err;
+ int err, alloc = 0;
- if (list_empty(&sci->sc_segbufs)) {
- segbuf = nilfs_segbuf_new(sci->sc_super);
- if (unlikely(!segbuf))
- return -ENOMEM;
- list_add(&segbuf->sb_list, &sci->sc_segbufs);
- } else
- segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
+ segbuf = nilfs_segbuf_new(sci->sc_super);
+ if (unlikely(!segbuf))
+ return -ENOMEM;
+
+ if (list_empty(&sci->sc_write_logs)) {
+ nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
+ nilfs->ns_pseg_offset, nilfs);
+ if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
+ nilfs_shift_to_next_segment(nilfs);
+ nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
+ }
- nilfs_segbuf_map(segbuf, nilfs->ns_segnum, nilfs->ns_pseg_offset,
- nilfs);
+ segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
+ nextnum = nilfs->ns_nextnum;
- if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
- nilfs_shift_to_next_segment(nilfs);
- nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
+ if (nilfs->ns_segnum == nilfs->ns_nextnum)
+ /* Start from the head of a new full segment */
+ alloc++;
+ } else {
+ /* Continue logs */
+ prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
+ nilfs_segbuf_map_cont(segbuf, prev);
+ segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq;
+ nextnum = prev->sb_nextnum;
+
+ if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
+ nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
+ segbuf->sb_sum.seg_seq++;
+ alloc++;
+ }
}
- sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
- err = nilfs_touch_segusage(nilfs->ns_sufile, segbuf->sb_segnum);
- if (unlikely(err))
- return err;
+ err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum);
+ if (err)
+ goto failed;
- if (nilfs->ns_segnum == nilfs->ns_nextnum) {
- /* Start from the head of a new full segment */
+ if (alloc) {
err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
- if (unlikely(err))
- return err;
- } else
- nextnum = nilfs->ns_nextnum;
-
- segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
+ if (err)
+ goto failed;
+ }
nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
- /* truncating segment buffers */
- list_for_each_entry_safe_continue(segbuf, n, &sci->sc_segbufs,
- sb_list) {
- list_del_init(&segbuf->sb_list);
- nilfs_segbuf_free(segbuf);
- }
+ BUG_ON(!list_empty(&sci->sc_segbufs));
+ list_add_tail(&segbuf->sb_list, &sci->sc_segbufs);
+ sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
return 0;
+
+ failed:
+ nilfs_segbuf_free(segbuf);
+ return err;
}
static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
struct the_nilfs *nilfs, int nadd)
{
- struct nilfs_segment_buffer *segbuf, *prev, *n;
+ struct nilfs_segment_buffer *segbuf, *prev;
struct inode *sufile = nilfs->ns_sufile;
__u64 nextnextnum;
LIST_HEAD(list);
@@ -1352,7 +1354,7 @@ static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
* not be dirty. The following call ensures that the buffer is dirty
* and will pin the buffer on memory until the sufile is written.
*/
- err = nilfs_touch_segusage(sufile, prev->sb_nextnum);
+ err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum);
if (unlikely(err))
return err;
@@ -1378,33 +1380,33 @@ static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
list_add_tail(&segbuf->sb_list, &list);
prev = segbuf;
}
- list_splice(&list, sci->sc_segbufs.prev);
+ list_splice_tail(&list, &sci->sc_segbufs);
return 0;
failed_segbuf:
nilfs_segbuf_free(segbuf);
failed:
- list_for_each_entry_safe(segbuf, n, &list, sb_list) {
+ list_for_each_entry(segbuf, &list, sb_list) {
ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
WARN_ON(ret); /* never fails */
- list_del_init(&segbuf->sb_list);
- nilfs_segbuf_free(segbuf);
}
+ nilfs_destroy_logs(&list);
return err;
}
-static void nilfs_segctor_free_incomplete_segments(struct nilfs_sc_info *sci,
- struct the_nilfs *nilfs)
+static void nilfs_free_incomplete_logs(struct list_head *logs,
+ struct the_nilfs *nilfs)
{
- struct nilfs_segment_buffer *segbuf;
- int ret, done = 0;
+ struct nilfs_segment_buffer *segbuf, *prev;
+ struct inode *sufile = nilfs->ns_sufile;
+ int ret;
- segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
+ segbuf = NILFS_FIRST_SEGBUF(logs);
if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
- ret = nilfs_sufile_free(nilfs->ns_sufile, segbuf->sb_nextnum);
+ ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
WARN_ON(ret); /* never fails */
}
- if (segbuf->sb_io_error) {
+ if (atomic_read(&segbuf->sb_err)) {
/* Case 1: The first segment failed */
if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
/* Case 1a: Partial segment appended into an existing
@@ -1413,106 +1415,54 @@ static void nilfs_segctor_free_incomplete_segments(struct nilfs_sc_info *sci,
segbuf->sb_fseg_end);
else /* Case 1b: New full segment */
set_nilfs_discontinued(nilfs);
- done++;
}
- list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
- ret = nilfs_sufile_free(nilfs->ns_sufile, segbuf->sb_nextnum);
- WARN_ON(ret); /* never fails */
- if (!done && segbuf->sb_io_error) {
- if (segbuf->sb_segnum != nilfs->ns_nextnum)
- /* Case 2: extended segment (!= next) failed */
- nilfs_sufile_set_error(nilfs->ns_sufile,
- segbuf->sb_segnum);
- done++;
- }
- }
-}
-
-static void nilfs_segctor_clear_segment_buffers(struct nilfs_sc_info *sci)
-{
- struct nilfs_segment_buffer *segbuf;
-
- list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list)
- nilfs_segbuf_clear(segbuf);
- sci->sc_super_root = NULL;
-}
-
-static void nilfs_segctor_destroy_segment_buffers(struct nilfs_sc_info *sci)
-{
- struct nilfs_segment_buffer *segbuf;
-
- while (!list_empty(&sci->sc_segbufs)) {
- segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
- list_del_init(&segbuf->sb_list);
- nilfs_segbuf_free(segbuf);
- }
- /* sci->sc_curseg = NULL; */
-}
-
-static void nilfs_segctor_end_construction(struct nilfs_sc_info *sci,
- struct the_nilfs *nilfs, int err)
-{
- if (unlikely(err)) {
- nilfs_segctor_free_incomplete_segments(sci, nilfs);
- if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
- int ret;
-
- ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
- sci->sc_freesegs,
- sci->sc_nfreesegs,
- NULL);
- WARN_ON(ret); /* do not happen */
+ prev = segbuf;
+ list_for_each_entry_continue(segbuf, logs, sb_list) {
+ if (prev->sb_nextnum != segbuf->sb_nextnum) {
+ ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
+ WARN_ON(ret); /* never fails */
}
+ if (atomic_read(&segbuf->sb_err) &&
+ segbuf->sb_segnum != nilfs->ns_nextnum)
+ /* Case 2: extended segment (!= next) failed */
+ nilfs_sufile_set_error(sufile, segbuf->sb_segnum);
+ prev = segbuf;
}
- nilfs_segctor_clear_segment_buffers(sci);
}
static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
struct inode *sufile)
{
struct nilfs_segment_buffer *segbuf;
- struct buffer_head *bh_su;
- struct nilfs_segment_usage *raw_su;
unsigned long live_blocks;
int ret;
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
- ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
- &raw_su, &bh_su);
- WARN_ON(ret); /* always succeed because bh_su is dirty */
live_blocks = segbuf->sb_sum.nblocks +
(segbuf->sb_pseg_start - segbuf->sb_fseg_start);
- raw_su->su_lastmod = cpu_to_le64(sci->sc_seg_ctime);
- raw_su->su_nblocks = cpu_to_le32(live_blocks);
- nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
- bh_su);
+ ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
+ live_blocks,
+ sci->sc_seg_ctime);
+ WARN_ON(ret); /* always succeed because the segusage is dirty */
}
}
-static void nilfs_segctor_cancel_segusage(struct nilfs_sc_info *sci,
- struct inode *sufile)
+static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile)
{
struct nilfs_segment_buffer *segbuf;
- struct buffer_head *bh_su;
- struct nilfs_segment_usage *raw_su;
int ret;
- segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
- ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
- &raw_su, &bh_su);
- WARN_ON(ret); /* always succeed because bh_su is dirty */
- raw_su->su_nblocks = cpu_to_le32(segbuf->sb_pseg_start -
- segbuf->sb_fseg_start);
- nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum, bh_su);
+ segbuf = NILFS_FIRST_SEGBUF(logs);
+ ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
+ segbuf->sb_pseg_start -
+ segbuf->sb_fseg_start, 0);
+ WARN_ON(ret); /* always succeed because the segusage is dirty */
- list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
- ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
- &raw_su, &bh_su);
+ list_for_each_entry_continue(segbuf, logs, sb_list) {
+ ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
+ 0, 0);
WARN_ON(ret); /* always succeed */
- raw_su->su_nblocks = 0;
- nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
- bh_su);
}
}
@@ -1520,17 +1470,15 @@ static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
struct nilfs_segment_buffer *last,
struct inode *sufile)
{
- struct nilfs_segment_buffer *segbuf = last, *n;
+ struct nilfs_segment_buffer *segbuf = last;
int ret;
- list_for_each_entry_safe_continue(segbuf, n, &sci->sc_segbufs,
- sb_list) {
- list_del_init(&segbuf->sb_list);
+ list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
WARN_ON(ret);
- nilfs_segbuf_free(segbuf);
}
+ nilfs_truncate_logs(&sci->sc_segbufs, last);
}
@@ -1569,7 +1517,7 @@ static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
NULL);
WARN_ON(err); /* do not happen */
}
- nilfs_segctor_clear_segment_buffers(sci);
+ nilfs_clear_logs(&sci->sc_segbufs);
err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
if (unlikely(err))
@@ -1814,26 +1762,18 @@ static int nilfs_segctor_prepare_write(struct nilfs_sc_info *sci,
}
static int nilfs_segctor_write(struct nilfs_sc_info *sci,
- struct backing_dev_info *bdi)
+ struct the_nilfs *nilfs)
{
struct nilfs_segment_buffer *segbuf;
- struct nilfs_write_info wi;
- int err, res;
-
- wi.sb = sci->sc_super;
- wi.bh_sr = sci->sc_super_root;
- wi.bdi = bdi;
+ int ret = 0;
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
- nilfs_segbuf_prepare_write(segbuf, &wi);
- err = nilfs_segbuf_write(segbuf, &wi);
-
- res = nilfs_segbuf_wait(segbuf, &wi);
- err = err ? : res;
- if (err)
- return err;
+ ret = nilfs_segbuf_write(segbuf, nilfs);
+ if (ret)
+ break;
}
- return 0;
+ list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
+ return ret;
}
static void __nilfs_end_page_io(struct page *page, int err)
@@ -1911,15 +1851,17 @@ static void nilfs_clear_copied_buffers(struct list_head *list, int err)
}
}
-static void nilfs_segctor_abort_write(struct nilfs_sc_info *sci,
- struct page *failed_page, int err)
+static void nilfs_abort_logs(struct list_head *logs, struct page *failed_page,
+ struct buffer_head *bh_sr, int err)
{
struct nilfs_segment_buffer *segbuf;
struct page *bd_page = NULL, *fs_page = NULL;
+ struct buffer_head *bh;
- list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
- struct buffer_head *bh;
+ if (list_empty(logs))
+ return;
+ list_for_each_entry(segbuf, logs, sb_list) {
list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
b_assoc_buffers) {
if (bh->b_page != bd_page) {
@@ -1931,7 +1873,7 @@ static void nilfs_segctor_abort_write(struct nilfs_sc_info *sci,
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
b_assoc_buffers) {
- if (bh == sci->sc_super_root) {
+ if (bh == bh_sr) {
if (bh->b_page != bd_page) {
end_page_writeback(bd_page);
bd_page = bh->b_page;
@@ -1941,7 +1883,7 @@ static void nilfs_segctor_abort_write(struct nilfs_sc_info *sci,
if (bh->b_page != fs_page) {
nilfs_end_page_io(fs_page, err);
if (fs_page && fs_page == failed_page)
- goto done;
+ return;
fs_page = bh->b_page;
}
}
@@ -1950,8 +1892,34 @@ static void nilfs_segctor_abort_write(struct nilfs_sc_info *sci,
end_page_writeback(bd_page);
nilfs_end_page_io(fs_page, err);
- done:
+}
+
+static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
+ struct the_nilfs *nilfs, int err)
+{
+ LIST_HEAD(logs);
+ int ret;
+
+ list_splice_tail_init(&sci->sc_write_logs, &logs);
+ ret = nilfs_wait_on_logs(&logs);
+ if (ret)
+ nilfs_abort_logs(&logs, NULL, sci->sc_super_root, ret);
+
+ list_splice_tail_init(&sci->sc_segbufs, &logs);
+ nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
+ nilfs_free_incomplete_logs(&logs, nilfs);
nilfs_clear_copied_buffers(&sci->sc_copied_buffers, err);
+
+ if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
+ ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
+ sci->sc_freesegs,
+ sci->sc_nfreesegs,
+ NULL);
+ WARN_ON(ret); /* do not happen */
+ }
+
+ nilfs_destroy_logs(&logs);
+ sci->sc_super_root = NULL;
}
static void nilfs_set_next_segment(struct the_nilfs *nilfs,
@@ -1973,7 +1941,7 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
struct the_nilfs *nilfs = sbi->s_nilfs;
int update_sr = (sci->sc_super_root != NULL);
- list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
+ list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
struct buffer_head *bh;
list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
@@ -2046,7 +2014,7 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
sci->sc_nblk_inc += sci->sc_nblk_this_inc;
- segbuf = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
+ segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
nilfs_set_next_segment(nilfs, segbuf);
if (update_sr) {
@@ -2057,10 +2025,23 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
+ nilfs_segctor_clear_metadata_dirty(sci);
} else
clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
}
+static int nilfs_segctor_wait(struct nilfs_sc_info *sci)
+{
+ int ret;
+
+ ret = nilfs_wait_on_logs(&sci->sc_write_logs);
+ if (!ret) {
+ nilfs_segctor_complete_write(sci);
+ nilfs_destroy_logs(&sci->sc_write_logs);
+ }
+ return ret;
+}
+
static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci,
struct nilfs_sb_info *sbi)
{
@@ -2173,7 +2154,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
/* Avoid empty segment */
if (sci->sc_stage.scnt == NILFS_ST_DONE &&
NILFS_SEG_EMPTY(&sci->sc_curseg->sb_sum)) {
- nilfs_segctor_end_construction(sci, nilfs, 1);
+ nilfs_segctor_abort_construction(sci, nilfs, 1);
goto out;
}
@@ -2187,7 +2168,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
if (has_sr) {
err = nilfs_segctor_fill_in_checkpoint(sci);
if (unlikely(err))
- goto failed_to_make_up;
+ goto failed_to_write;
nilfs_segctor_fill_in_super_root(sci, nilfs);
}
@@ -2195,42 +2176,46 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
/* Write partial segments */
err = nilfs_segctor_prepare_write(sci, &failed_page);
- if (unlikely(err))
+ if (err) {
+ nilfs_abort_logs(&sci->sc_segbufs, failed_page,
+ sci->sc_super_root, err);
goto failed_to_write;
-
+ }
nilfs_segctor_fill_in_checksums(sci, nilfs->ns_crc_seed);
- err = nilfs_segctor_write(sci, nilfs->ns_bdi);
+ err = nilfs_segctor_write(sci, nilfs);
if (unlikely(err))
goto failed_to_write;
- nilfs_segctor_complete_write(sci);
-
- /* Commit segments */
- if (has_sr)
- nilfs_segctor_clear_metadata_dirty(sci);
-
- nilfs_segctor_end_construction(sci, nilfs, 0);
-
+ if (sci->sc_stage.scnt == NILFS_ST_DONE ||
+ nilfs->ns_blocksize_bits != PAGE_CACHE_SHIFT) {
+ /*
+ * At this point, we avoid double buffering
+ * for blocksize < pagesize because page dirty
+ * flag is turned off during write and dirty
+ * buffers are not properly collected for
+ * pages crossing over segments.
+ */
+ err = nilfs_segctor_wait(sci);
+ if (err)
+ goto failed_to_write;
+ }
} while (sci->sc_stage.scnt != NILFS_ST_DONE);
+ sci->sc_super_root = NULL;
+
out:
- nilfs_segctor_destroy_segment_buffers(sci);
nilfs_segctor_check_out_files(sci, sbi);
return err;
failed_to_write:
- nilfs_segctor_abort_write(sci, failed_page, err);
- nilfs_segctor_cancel_segusage(sci, nilfs->ns_sufile);
-
- failed_to_make_up:
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
nilfs_redirty_inodes(&sci->sc_dirty_files);
failed:
if (nilfs_doing_gc())
nilfs_redirty_inodes(&sci->sc_gc_inodes);
- nilfs_segctor_end_construction(sci, nilfs, err);
+ nilfs_segctor_abort_construction(sci, nilfs, err);
goto out;
}
@@ -2559,7 +2544,7 @@ int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
sci->sc_freesegs = kbufs[4];
sci->sc_nfreesegs = argv[4].v_nmembs;
- list_splice_init(&nilfs->ns_gc_inodes, sci->sc_gc_inodes.prev);
+ list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
for (;;) {
nilfs_segctor_accept(sci, &req);
@@ -2788,6 +2773,7 @@ static struct nilfs_sc_info *nilfs_segctor_new(struct nilfs_sb_info *sbi)
spin_lock_init(&sci->sc_state_lock);
INIT_LIST_HEAD(&sci->sc_dirty_files);
INIT_LIST_HEAD(&sci->sc_segbufs);
+ INIT_LIST_HEAD(&sci->sc_write_logs);
INIT_LIST_HEAD(&sci->sc_gc_inodes);
INIT_LIST_HEAD(&sci->sc_copied_buffers);
@@ -2855,6 +2841,7 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
}
WARN_ON(!list_empty(&sci->sc_segbufs));
+ WARN_ON(!list_empty(&sci->sc_write_logs));
down_write(&sbi->s_nilfs->ns_segctor_sem);
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index 0d2a475..3d3ab2f 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -97,6 +97,7 @@ struct nilfs_segsum_pointer {
* @sc_dsync_start: start byte offset of data pages
* @sc_dsync_end: end byte offset of data pages (inclusive)
* @sc_segbufs: List of segment buffers
+ * @sc_write_logs: List of segment buffers to hold logs under writing
* @sc_segbuf_nblocks: Number of available blocks in segment buffers.
* @sc_curseg: Current segment buffer
* @sc_super_root: Pointer to the super root buffer
@@ -143,6 +144,7 @@ struct nilfs_sc_info {
/* Segment buffers */
struct list_head sc_segbufs;
+ struct list_head sc_write_logs;
unsigned long sc_segbuf_nblocks;
struct nilfs_segment_buffer *sc_curseg;
struct buffer_head *sc_super_root;
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 37994d4..b6c36d0 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -31,6 +31,16 @@
#include "sufile.h"
+struct nilfs_sufile_info {
+ struct nilfs_mdt_info mi;
+ unsigned long ncleansegs;
+};
+
+static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile)
+{
+ return (struct nilfs_sufile_info *)NILFS_MDT(sufile);
+}
+
static inline unsigned long
nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
{
@@ -62,14 +72,6 @@ nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr,
max - curr + 1);
}
-static inline struct nilfs_sufile_header *
-nilfs_sufile_block_get_header(const struct inode *sufile,
- struct buffer_head *bh,
- void *kaddr)
-{
- return kaddr + bh_offset(bh);
-}
-
static struct nilfs_segment_usage *
nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum,
struct buffer_head *bh, void *kaddr)
@@ -110,6 +112,15 @@ static void nilfs_sufile_mod_counter(struct buffer_head *header_bh,
}
/**
+ * nilfs_sufile_get_ncleansegs - return the number of clean segments
+ * @sufile: inode of segment usage file
+ */
+unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile)
+{
+ return NILFS_SUI(sufile)->ncleansegs;
+}
+
+/**
* nilfs_sufile_updatev - modify multiple segment usages at a time
* @sufile: inode of segment usage file
* @segnumv: array of segment numbers
@@ -270,7 +281,7 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
if (ret < 0)
goto out_sem;
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
- header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
+ header = kaddr + bh_offset(header_bh);
ncleansegs = le64_to_cpu(header->sh_ncleansegs);
last_alloc = le64_to_cpu(header->sh_last_alloc);
kunmap_atomic(kaddr, KM_USER0);
@@ -302,13 +313,13 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
kunmap_atomic(kaddr, KM_USER0);
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
- header = nilfs_sufile_block_get_header(
- sufile, header_bh, kaddr);
+ header = kaddr + bh_offset(header_bh);
le64_add_cpu(&header->sh_ncleansegs, -1);
le64_add_cpu(&header->sh_ndirtysegs, 1);
header->sh_last_alloc = cpu_to_le64(segnum);
kunmap_atomic(kaddr, KM_USER0);
+ NILFS_SUI(sufile)->ncleansegs--;
nilfs_mdt_mark_buffer_dirty(header_bh);
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
@@ -351,6 +362,8 @@ void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
kunmap_atomic(kaddr, KM_USER0);
nilfs_sufile_mod_counter(header_bh, -1, 1);
+ NILFS_SUI(sufile)->ncleansegs--;
+
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
}
@@ -380,6 +393,8 @@ void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
kunmap_atomic(kaddr, KM_USER0);
nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
+ NILFS_SUI(sufile)->ncleansegs -= clean;
+
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
}
@@ -409,79 +424,65 @@ void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
+ NILFS_SUI(sufile)->ncleansegs++;
+
nilfs_mdt_mark_dirty(sufile);
}
/**
- * nilfs_sufile_get_segment_usage - get a segment usage
+ * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
* @sufile: inode of segment usage file
* @segnum: segment number
- * @sup: pointer to segment usage
- * @bhp: pointer to buffer head
- *
- * Description: nilfs_sufile_get_segment_usage() acquires the segment usage
- * specified by @segnum.
- *
- * Return Value: On success, 0 is returned, and the segment usage and the
- * buffer head of the buffer on which the segment usage is located are stored
- * in the place pointed by @sup and @bhp, respectively. On error, one of the
- * following negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-EINVAL - Invalid segment usage number.
*/
-int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum,
- struct nilfs_segment_usage **sup,
- struct buffer_head **bhp)
+int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
{
struct buffer_head *bh;
- struct nilfs_segment_usage *su;
- void *kaddr;
int ret;
- /* segnum is 0 origin */
- if (segnum >= nilfs_sufile_get_nsegments(sufile))
- return -EINVAL;
- down_write(&NILFS_MDT(sufile)->mi_sem);
- ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh);
- if (ret < 0)
- goto out_sem;
- kaddr = kmap(bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
- if (nilfs_segment_usage_error(su)) {
- kunmap(bh->b_page);
+ ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
+ if (!ret) {
+ nilfs_mdt_mark_buffer_dirty(bh);
+ nilfs_mdt_mark_dirty(sufile);
brelse(bh);
- ret = -EINVAL;
- goto out_sem;
}
-
- if (sup != NULL)
- *sup = su;
- *bhp = bh;
-
- out_sem:
- up_write(&NILFS_MDT(sufile)->mi_sem);
return ret;
}
/**
- * nilfs_sufile_put_segment_usage - put a segment usage
+ * nilfs_sufile_set_segment_usage - set usage of a segment
* @sufile: inode of segment usage file
* @segnum: segment number
- * @bh: buffer head
- *
- * Description: nilfs_sufile_put_segment_usage() releases the segment usage
- * specified by @segnum. @bh must be the buffer head which have been returned
- * by a previous call to nilfs_sufile_get_segment_usage() with @segnum.
+ * @nblocks: number of live blocks in the segment
+ * @modtime: modification time (option)
*/
-void nilfs_sufile_put_segment_usage(struct inode *sufile, __u64 segnum,
- struct buffer_head *bh)
+int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
+ unsigned long nblocks, time_t modtime)
{
- kunmap(bh->b_page);
+ struct buffer_head *bh;
+ struct nilfs_segment_usage *su;
+ void *kaddr;
+ int ret;
+
+ down_write(&NILFS_MDT(sufile)->mi_sem);
+ ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
+ if (ret < 0)
+ goto out_sem;
+
+ kaddr = kmap_atomic(bh->b_page, KM_USER0);
+ su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
+ WARN_ON(nilfs_segment_usage_error(su));
+ if (modtime)
+ su->su_lastmod = cpu_to_le64(modtime);
+ su->su_nblocks = cpu_to_le32(nblocks);
+ kunmap_atomic(kaddr, KM_USER0);
+
+ nilfs_mdt_mark_buffer_dirty(bh);
+ nilfs_mdt_mark_dirty(sufile);
brelse(bh);
+
+ out_sem:
+ up_write(&NILFS_MDT(sufile)->mi_sem);
+ return ret;
}
/**
@@ -515,7 +516,7 @@ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
goto out_sem;
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
- header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
+ header = kaddr + bh_offset(header_bh);
sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
@@ -532,33 +533,6 @@ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
return ret;
}
-/**
- * nilfs_sufile_get_ncleansegs - get the number of clean segments
- * @sufile: inode of segment usage file
- * @nsegsp: pointer to the number of clean segments
- *
- * Description: nilfs_sufile_get_ncleansegs() acquires the number of clean
- * segments.
- *
- * Return Value: On success, 0 is returned and the number of clean segments is
- * stored in the place pointed by @nsegsp. On error, one of the following
- * negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- */
-int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp)
-{
- struct nilfs_sustat sustat;
- int ret;
-
- ret = nilfs_sufile_get_stat(sufile, &sustat);
- if (ret == 0)
- *nsegsp = sustat.ss_ncleansegs;
- return ret;
-}
-
void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
struct buffer_head *header_bh,
struct buffer_head *su_bh)
@@ -577,8 +551,10 @@ void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
nilfs_segment_usage_set_error(su);
kunmap_atomic(kaddr, KM_USER0);
- if (suclean)
+ if (suclean) {
nilfs_sufile_mod_counter(header_bh, -1, 0);
+ NILFS_SUI(sufile)->ncleansegs--;
+ }
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
}
@@ -657,3 +633,48 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
up_read(&NILFS_MDT(sufile)->mi_sem);
return ret;
}
+
+/**
+ * nilfs_sufile_read - read sufile inode
+ * @sufile: sufile inode
+ * @raw_inode: on-disk sufile inode
+ */
+int nilfs_sufile_read(struct inode *sufile, struct nilfs_inode *raw_inode)
+{
+ struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
+ struct buffer_head *header_bh;
+ struct nilfs_sufile_header *header;
+ void *kaddr;
+ int ret;
+
+ ret = nilfs_read_inode_common(sufile, raw_inode);
+ if (ret < 0)
+ return ret;
+
+ ret = nilfs_sufile_get_header_block(sufile, &header_bh);
+ if (!ret) {
+ kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
+ header = kaddr + bh_offset(header_bh);
+ sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
+ kunmap_atomic(kaddr, KM_USER0);
+ brelse(header_bh);
+ }
+ return ret;
+}
+
+/**
+ * nilfs_sufile_new - create sufile
+ * @nilfs: nilfs object
+ * @susize: size of a segment usage entry
+ */
+struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize)
+{
+ struct inode *sufile;
+
+ sufile = nilfs_mdt_new(nilfs, NULL, NILFS_SUFILE_INO,
+ sizeof(struct nilfs_sufile_info));
+ if (sufile)
+ nilfs_mdt_set_entry_size(sufile, susize,
+ sizeof(struct nilfs_sufile_header));
+ return sufile;
+}
diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h
index 0e99e5c..15163b8 100644
--- a/fs/nilfs2/sufile.h
+++ b/fs/nilfs2/sufile.h
@@ -34,14 +34,13 @@ static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
}
+unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
+
int nilfs_sufile_alloc(struct inode *, __u64 *);
-int nilfs_sufile_get_segment_usage(struct inode *, __u64,
- struct nilfs_segment_usage **,
- struct buffer_head **);
-void nilfs_sufile_put_segment_usage(struct inode *, __u64,
- struct buffer_head *);
+int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
+int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
+ unsigned long nblocks, time_t modtime);
int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
-int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *);
ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
size_t);
@@ -62,6 +61,9 @@ void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
+int nilfs_sufile_read(struct inode *sufile, struct nilfs_inode *raw_inode);
+struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize);
+
/**
* nilfs_sufile_scrap - make a segment garbage
* @sufile: inode of segment usage file
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 644e667..5403b3e 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -363,14 +363,10 @@ int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
list_add(&sbi->s_list, &nilfs->ns_supers);
up_write(&nilfs->ns_super_sem);
- sbi->s_ifile = nilfs_mdt_new(nilfs, sbi->s_super, NILFS_IFILE_INO);
+ sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size);
if (!sbi->s_ifile)
return -ENOMEM;
- err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size);
- if (unlikely(err))
- goto failed;
-
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
&bh_cp);
@@ -411,7 +407,6 @@ void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
- nilfs_mdt_clear(sbi->s_ifile);
nilfs_mdt_destroy(sbi->s_ifile);
sbi->s_ifile = NULL;
down_write(&nilfs->ns_super_sem);
@@ -419,22 +414,6 @@ void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi)
up_write(&nilfs->ns_super_sem);
}
-static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi)
-{
- struct the_nilfs *nilfs = sbi->s_nilfs;
- int err = 0;
-
- down_write(&nilfs->ns_sem);
- if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
- nilfs->ns_mount_state |= NILFS_VALID_FS;
- err = nilfs_commit_super(sbi, 1);
- if (likely(!err))
- printk(KERN_INFO "NILFS: recovery complete.\n");
- }
- up_write(&nilfs->ns_sem);
- return err;
-}
-
static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
@@ -490,7 +469,7 @@ static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
struct nilfs_sb_info *sbi = NILFS_SB(sb);
if (!nilfs_test_opt(sbi, BARRIER))
- seq_printf(seq, ",barrier=off");
+ seq_printf(seq, ",nobarrier");
if (nilfs_test_opt(sbi, SNAPSHOT))
seq_printf(seq, ",cp=%llu",
(unsigned long long int)sbi->s_snapshot_cno);
@@ -500,6 +479,8 @@ static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_printf(seq, ",errors=panic");
if (nilfs_test_opt(sbi, STRICT_ORDER))
seq_printf(seq, ",order=strict");
+ if (nilfs_test_opt(sbi, NORECOVERY))
+ seq_printf(seq, ",norecovery");
return 0;
}
@@ -568,7 +549,7 @@ static const struct export_operations nilfs_export_ops = {
enum {
Opt_err_cont, Opt_err_panic, Opt_err_ro,
- Opt_barrier, Opt_snapshot, Opt_order,
+ Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Opt_err,
};
@@ -576,25 +557,13 @@ static match_table_t tokens = {
{Opt_err_cont, "errors=continue"},
{Opt_err_panic, "errors=panic"},
{Opt_err_ro, "errors=remount-ro"},
- {Opt_barrier, "barrier=%s"},
+ {Opt_nobarrier, "nobarrier"},
{Opt_snapshot, "cp=%u"},
{Opt_order, "order=%s"},
+ {Opt_norecovery, "norecovery"},
{Opt_err, NULL}
};
-static int match_bool(substring_t *s, int *result)
-{
- int len = s->to - s->from;
-
- if (strncmp(s->from, "on", len) == 0)
- *result = 1;
- else if (strncmp(s->from, "off", len) == 0)
- *result = 0;
- else
- return 1;
- return 0;
-}
-
static int parse_options(char *options, struct super_block *sb)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
@@ -612,13 +581,8 @@ static int parse_options(char *options, struct super_block *sb)
token = match_token(p, tokens, args);
switch (token) {
- case Opt_barrier:
- if (match_bool(&args[0], &option))
- return 0;
- if (option)
- nilfs_set_opt(sbi, BARRIER);
- else
- nilfs_clear_opt(sbi, BARRIER);
+ case Opt_nobarrier:
+ nilfs_clear_opt(sbi, BARRIER);
break;
case Opt_order:
if (strcmp(args[0].from, "relaxed") == 0)
@@ -647,6 +611,9 @@ static int parse_options(char *options, struct super_block *sb)
sbi->s_snapshot_cno = option;
nilfs_set_opt(sbi, SNAPSHOT);
break;
+ case Opt_norecovery:
+ nilfs_set_opt(sbi, NORECOVERY);
+ break;
default:
printk(KERN_ERR
"NILFS: Unrecognized mount option \"%s\"\n", p);
@@ -672,9 +639,7 @@ static int nilfs_setup_super(struct nilfs_sb_info *sbi)
int mnt_count = le16_to_cpu(sbp->s_mnt_count);
/* nilfs->sem must be locked by the caller. */
- if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
- printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n");
- } else if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
+ if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
printk(KERN_WARNING
"NILFS warning: mounting fs with errors\n");
#if 0
@@ -782,11 +747,10 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
sb->s_root = NULL;
sb->s_time_gran = 1;
- if (!nilfs_loaded(nilfs)) {
- err = load_nilfs(nilfs, sbi);
- if (err)
- goto failed_sbi;
- }
+ err = load_nilfs(nilfs, sbi);
+ if (err)
+ goto failed_sbi;
+
cno = nilfs_last_cno(nilfs);
if (sb->s_flags & MS_RDONLY) {
@@ -854,12 +818,6 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
up_write(&nilfs->ns_sem);
}
- err = nilfs_mark_recovery_complete(sbi);
- if (unlikely(err)) {
- printk(KERN_ERR "NILFS: recovery failed.\n");
- goto failed_root;
- }
-
down_write(&nilfs->ns_super_sem);
if (!nilfs_test_opt(sbi, SNAPSHOT))
nilfs->ns_current = sbi;
@@ -867,10 +825,6 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
return 0;
- failed_root:
- dput(sb->s_root);
- sb->s_root = NULL;
-
failed_segctor:
nilfs_detach_segment_constructor(sbi);
@@ -915,6 +869,14 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
goto restore_opts;
}
+ if (!nilfs_valid_fs(nilfs)) {
+ printk(KERN_WARNING "NILFS (device %s): couldn't "
+ "remount because the filesystem is in an "
+ "incomplete recovery state.\n", sb->s_id);
+ err = -EINVAL;
+ goto restore_opts;
+ }
+
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
goto out;
if (*flags & MS_RDONLY) {
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index ad391a8..6241e17 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -146,13 +146,9 @@ void put_nilfs(struct the_nilfs *nilfs)
might_sleep();
if (nilfs_loaded(nilfs)) {
- nilfs_mdt_clear(nilfs->ns_sufile);
nilfs_mdt_destroy(nilfs->ns_sufile);
- nilfs_mdt_clear(nilfs->ns_cpfile);
nilfs_mdt_destroy(nilfs->ns_cpfile);
- nilfs_mdt_clear(nilfs->ns_dat);
nilfs_mdt_destroy(nilfs->ns_dat);
- /* XXX: how and when to clear nilfs->ns_gc_dat? */
nilfs_mdt_destroy(nilfs->ns_gc_dat);
}
if (nilfs_init(nilfs)) {
@@ -166,7 +162,6 @@ void put_nilfs(struct the_nilfs *nilfs)
static int nilfs_load_super_root(struct the_nilfs *nilfs,
struct nilfs_sb_info *sbi, sector_t sr_block)
{
- static struct lock_class_key dat_lock_key;
struct buffer_head *bh_sr;
struct nilfs_super_root *raw_sr;
struct nilfs_super_block **sbp = nilfs->ns_sbp;
@@ -187,51 +182,36 @@ static int nilfs_load_super_root(struct the_nilfs *nilfs,
inode_size = nilfs->ns_inode_size;
err = -ENOMEM;
- nilfs->ns_dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO);
+ nilfs->ns_dat = nilfs_dat_new(nilfs, dat_entry_size);
if (unlikely(!nilfs->ns_dat))
goto failed;
- nilfs->ns_gc_dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO);
+ nilfs->ns_gc_dat = nilfs_dat_new(nilfs, dat_entry_size);
if (unlikely(!nilfs->ns_gc_dat))
goto failed_dat;
- nilfs->ns_cpfile = nilfs_mdt_new(nilfs, NULL, NILFS_CPFILE_INO);
+ nilfs->ns_cpfile = nilfs_cpfile_new(nilfs, checkpoint_size);
if (unlikely(!nilfs->ns_cpfile))
goto failed_gc_dat;
- nilfs->ns_sufile = nilfs_mdt_new(nilfs, NULL, NILFS_SUFILE_INO);
+ nilfs->ns_sufile = nilfs_sufile_new(nilfs, segment_usage_size);
if (unlikely(!nilfs->ns_sufile))
goto failed_cpfile;
- err = nilfs_palloc_init_blockgroup(nilfs->ns_dat, dat_entry_size);
- if (unlikely(err))
- goto failed_sufile;
-
- err = nilfs_palloc_init_blockgroup(nilfs->ns_gc_dat, dat_entry_size);
- if (unlikely(err))
- goto failed_sufile;
-
- lockdep_set_class(&NILFS_MDT(nilfs->ns_dat)->mi_sem, &dat_lock_key);
- lockdep_set_class(&NILFS_MDT(nilfs->ns_gc_dat)->mi_sem, &dat_lock_key);
-
nilfs_mdt_set_shadow(nilfs->ns_dat, nilfs->ns_gc_dat);
- nilfs_mdt_set_entry_size(nilfs->ns_cpfile, checkpoint_size,
- sizeof(struct nilfs_cpfile_header));
- nilfs_mdt_set_entry_size(nilfs->ns_sufile, segment_usage_size,
- sizeof(struct nilfs_sufile_header));
- err = nilfs_mdt_read_inode_direct(
- nilfs->ns_dat, bh_sr, NILFS_SR_DAT_OFFSET(inode_size));
+ err = nilfs_dat_read(nilfs->ns_dat, (void *)bh_sr->b_data +
+ NILFS_SR_DAT_OFFSET(inode_size));
if (unlikely(err))
goto failed_sufile;
- err = nilfs_mdt_read_inode_direct(
- nilfs->ns_cpfile, bh_sr, NILFS_SR_CPFILE_OFFSET(inode_size));
+ err = nilfs_cpfile_read(nilfs->ns_cpfile, (void *)bh_sr->b_data +
+ NILFS_SR_CPFILE_OFFSET(inode_size));
if (unlikely(err))
goto failed_sufile;
- err = nilfs_mdt_read_inode_direct(
- nilfs->ns_sufile, bh_sr, NILFS_SR_SUFILE_OFFSET(inode_size));
+ err = nilfs_sufile_read(nilfs->ns_sufile, (void *)bh_sr->b_data +
+ NILFS_SR_SUFILE_OFFSET(inode_size));
if (unlikely(err))
goto failed_sufile;
@@ -281,29 +261,30 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
struct nilfs_recovery_info ri;
unsigned int s_flags = sbi->s_super->s_flags;
int really_read_only = bdev_read_only(nilfs->ns_bdev);
- unsigned valid_fs;
- int err = 0;
-
- nilfs_init_recovery_info(&ri);
+ int valid_fs = nilfs_valid_fs(nilfs);
+ int err;
- down_write(&nilfs->ns_sem);
- valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS);
- up_write(&nilfs->ns_sem);
+ if (nilfs_loaded(nilfs)) {
+ if (valid_fs ||
+ ((s_flags & MS_RDONLY) && nilfs_test_opt(sbi, NORECOVERY)))
+ return 0;
+ printk(KERN_ERR "NILFS: the filesystem is in an incomplete "
+ "recovery state.\n");
+ return -EINVAL;
+ }
- if (!valid_fs && (s_flags & MS_RDONLY)) {
- printk(KERN_INFO "NILFS: INFO: recovery "
- "required for readonly filesystem.\n");
- if (really_read_only) {
- printk(KERN_ERR "NILFS: write access "
- "unavailable, cannot proceed.\n");
- err = -EROFS;
- goto failed;
+ if (!valid_fs) {
+ printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n");
+ if (s_flags & MS_RDONLY) {
+ printk(KERN_INFO "NILFS: INFO: recovery "
+ "required for readonly filesystem.\n");
+ printk(KERN_INFO "NILFS: write access will "
+ "be enabled during recovery.\n");
}
- printk(KERN_INFO "NILFS: write access will "
- "be enabled during recovery.\n");
- sbi->s_super->s_flags &= ~MS_RDONLY;
}
+ nilfs_init_recovery_info(&ri);
+
err = nilfs_search_super_root(nilfs, sbi, &ri);
if (unlikely(err)) {
printk(KERN_ERR "NILFS: error searching super root.\n");
@@ -316,19 +297,56 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
goto failed;
}
- if (!valid_fs) {
- err = nilfs_recover_logical_segments(nilfs, sbi, &ri);
- if (unlikely(err)) {
- nilfs_mdt_destroy(nilfs->ns_cpfile);
- nilfs_mdt_destroy(nilfs->ns_sufile);
- nilfs_mdt_destroy(nilfs->ns_dat);
- goto failed;
+ if (valid_fs)
+ goto skip_recovery;
+
+ if (s_flags & MS_RDONLY) {
+ if (nilfs_test_opt(sbi, NORECOVERY)) {
+ printk(KERN_INFO "NILFS: norecovery option specified. "
+ "skipping roll-forward recovery\n");
+ goto skip_recovery;
}
- if (ri.ri_need_recovery == NILFS_RECOVERY_SR_UPDATED)
- sbi->s_super->s_dirt = 1;
+ if (really_read_only) {
+ printk(KERN_ERR "NILFS: write access "
+ "unavailable, cannot proceed.\n");
+ err = -EROFS;
+ goto failed_unload;
+ }
+ sbi->s_super->s_flags &= ~MS_RDONLY;
+ } else if (nilfs_test_opt(sbi, NORECOVERY)) {
+ printk(KERN_ERR "NILFS: recovery cancelled because norecovery "
+ "option was specified for a read/write mount\n");
+ err = -EINVAL;
+ goto failed_unload;
}
+ err = nilfs_recover_logical_segments(nilfs, sbi, &ri);
+ if (err)
+ goto failed_unload;
+
+ down_write(&nilfs->ns_sem);
+ nilfs->ns_mount_state |= NILFS_VALID_FS;
+ nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
+ err = nilfs_commit_super(sbi, 1);
+ up_write(&nilfs->ns_sem);
+
+ if (err) {
+ printk(KERN_ERR "NILFS: failed to update super block. "
+ "recovery unfinished.\n");
+ goto failed_unload;
+ }
+ printk(KERN_INFO "NILFS: recovery complete.\n");
+
+ skip_recovery:
set_nilfs_loaded(nilfs);
+ nilfs_clear_recovery_info(&ri);
+ sbi->s_super->s_flags = s_flags;
+ return 0;
+
+ failed_unload:
+ nilfs_mdt_destroy(nilfs->ns_cpfile);
+ nilfs_mdt_destroy(nilfs->ns_sufile);
+ nilfs_mdt_destroy(nilfs->ns_dat);
failed:
nilfs_clear_recovery_info(&ri);
@@ -632,30 +650,23 @@ int nilfs_count_free_blocks(struct the_nilfs *nilfs, sector_t *nblocks)
{
struct inode *dat = nilfs_dat_inode(nilfs);
unsigned long ncleansegs;
- int err;
down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
- err = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile, &ncleansegs);
+ ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
- if (likely(!err))
- *nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment;
- return err;
+ *nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment;
+ return 0;
}
int nilfs_near_disk_full(struct the_nilfs *nilfs)
{
- struct inode *sufile = nilfs->ns_sufile;
unsigned long ncleansegs, nincsegs;
- int ret;
- ret = nilfs_sufile_get_ncleansegs(sufile, &ncleansegs);
- if (likely(!ret)) {
- nincsegs = atomic_read(&nilfs->ns_ndirtyblks) /
- nilfs->ns_blocks_per_segment + 1;
- if (ncleansegs <= nilfs->ns_nrsvsegs + nincsegs)
- ret++;
- }
- return ret;
+ ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
+ nincsegs = atomic_read(&nilfs->ns_ndirtyblks) /
+ nilfs->ns_blocks_per_segment + 1;
+
+ return ncleansegs <= nilfs->ns_nrsvsegs + nincsegs;
}
/**
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 20abd55..589786e 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -258,6 +258,16 @@ static inline void nilfs_put_sbinfo(struct nilfs_sb_info *sbi)
kfree(sbi);
}
+static inline int nilfs_valid_fs(struct the_nilfs *nilfs)
+{
+ unsigned valid_fs;
+
+ down_read(&nilfs->ns_sem);
+ valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS);
+ up_read(&nilfs->ns_sem);
+ return valid_fs;
+}
+
static inline void
nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum,
sector_t *seg_start, sector_t *seg_end)
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index ce52040..3fe02cf 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -151,6 +151,8 @@ struct nilfs_super_root {
#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
semantics also for data */
+#define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
+ mount-time recovery */
/**
@@ -403,6 +405,28 @@ struct nilfs_segment_summary {
#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
/**
+ * struct nilfs_btree_node - B-tree node
+ * @bn_flags: flags
+ * @bn_level: level
+ * @bn_nchildren: number of children
+ * @bn_pad: padding
+ */
+struct nilfs_btree_node {
+ __u8 bn_flags;
+ __u8 bn_level;
+ __le16 bn_nchildren;
+ __le32 bn_pad;
+};
+
+/* flags */
+#define NILFS_BTREE_NODE_ROOT 0x01
+
+/* level */
+#define NILFS_BTREE_LEVEL_DATA 0
+#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
+#define NILFS_BTREE_LEVEL_MAX 14
+
+/**
* struct nilfs_palloc_group_desc - block group descriptor
* @pg_nfrees: number of free entries in block group
*/
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