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-rw-r--r--fs/btrfs/ctree.c8
-rw-r--r--fs/btrfs/ctree.h18
-rw-r--r--fs/btrfs/disk-io.c56
-rw-r--r--fs/btrfs/extent-tree.c31
-rw-r--r--fs/btrfs/ioctl.c2
-rw-r--r--fs/btrfs/super.c9
-rw-r--r--fs/btrfs/volumes.c1103
-rw-r--r--fs/btrfs/volumes.h20
8 files changed, 932 insertions, 315 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 8bb4524..dd1c03a 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -185,6 +185,10 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
btrfs_set_header_owner(cow, new_root_objectid);
btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN);
+ write_extent_buffer(cow, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(cow),
+ BTRFS_FSID_SIZE);
+
WARN_ON(btrfs_header_generation(buf) > trans->transid);
ret = btrfs_inc_ref(trans, new_root, buf, cow, NULL);
kfree(new_root);
@@ -274,6 +278,10 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans,
btrfs_set_header_owner(cow, root->root_key.objectid);
btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN);
+ write_extent_buffer(cow, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(cow),
+ BTRFS_FSID_SIZE);
+
WARN_ON(btrfs_header_generation(buf) > trans->transid);
if (btrfs_header_generation(buf) != trans->transid) {
u32 nr_extents;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c4c6c12..5ff7428 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -177,6 +177,9 @@ struct btrfs_dev_item {
/* type and info about this device */
__le64 type;
+ /* expected generation for this device */
+ __le64 generation;
+
/* grouping information for allocation decisions */
__le32 dev_group;
@@ -188,6 +191,9 @@ struct btrfs_dev_item {
/* btrfs generated uuid for this device */
u8 uuid[BTRFS_UUID_SIZE];
+
+ /* uuid of FS who owns this device */
+ u8 fsid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));
struct btrfs_stripe {
@@ -263,6 +269,7 @@ struct btrfs_header {
sizeof(struct btrfs_item) - \
sizeof(struct btrfs_file_extent_item))
+#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
/*
* this is a very generous portion of the super block, giving us
@@ -278,7 +285,7 @@ struct btrfs_header {
struct btrfs_super_block {
u8 csum[BTRFS_CSUM_SIZE];
/* the first 4 fields must match struct btrfs_header */
- u8 fsid[16]; /* FS specific uuid */
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
__le64 bytenr; /* this block number */
__le64 flags;
@@ -941,6 +948,7 @@ BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
+BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
@@ -960,12 +968,19 @@ BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
seek_speed, 8);
BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
bandwidth, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
+ generation, 64);
static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
{
return (char *)d + offsetof(struct btrfs_dev_item, uuid);
}
+static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
+{
+ return (char *)d + offsetof(struct btrfs_dev_item, fsid);
+}
+
BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
@@ -1661,6 +1676,7 @@ int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans,
struct extent_buffer *buf, u64 orig_start);
int btrfs_add_dead_reloc_root(struct btrfs_root *root);
int btrfs_cleanup_reloc_trees(struct btrfs_root *root);
+u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
/* ctree.c */
int btrfs_previous_item(struct btrfs_root *root,
struct btrfs_path *path, u64 min_objectid,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c599f0e..82833e5 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -345,6 +345,25 @@ out:
return 0;
}
+static int check_tree_block_fsid(struct btrfs_root *root,
+ struct extent_buffer *eb)
+{
+ struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
+ u8 fsid[BTRFS_UUID_SIZE];
+ int ret = 1;
+
+ read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb),
+ BTRFS_FSID_SIZE);
+ while (fs_devices) {
+ if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
+ ret = 0;
+ break;
+ }
+ fs_devices = fs_devices->seed;
+ }
+ return ret;
+}
+
int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
struct extent_state *state)
{
@@ -382,9 +401,7 @@ int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
ret = -EIO;
goto err;
}
- if (memcmp_extent_buffer(eb, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(eb),
- BTRFS_FSID_SIZE)) {
+ if (check_tree_block_fsid(root, eb)) {
printk("bad fsid on block %Lu\n", eb->start);
ret = -EIO;
goto err;
@@ -1558,9 +1575,11 @@ struct btrfs_root *open_ctree(struct super_block *sb,
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
- err = btrfs_parse_options(tree_root, options);
- if (err)
+ ret = btrfs_parse_options(tree_root, options);
+ if (ret) {
+ err = ret;
goto fail_sb_buffer;
+ }
/*
* we need to start all the end_io workers up front because the
@@ -1610,18 +1629,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
btrfs_start_workers(&fs_info->endio_write_workers,
fs_info->thread_pool_size);
- err = -EINVAL;
- if (btrfs_super_num_devices(disk_super) > fs_devices->open_devices) {
- printk("Btrfs: wanted %llu devices, but found %llu\n",
- (unsigned long long)btrfs_super_num_devices(disk_super),
- (unsigned long long)fs_devices->open_devices);
- if (btrfs_test_opt(tree_root, DEGRADED))
- printk("continuing in degraded mode\n");
- else {
- goto fail_sb_buffer;
- }
- }
-
fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
4 * 1024 * 1024 / PAGE_CACHE_SIZE);
@@ -1672,7 +1679,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
mutex_lock(&fs_info->chunk_mutex);
ret = btrfs_read_chunk_tree(chunk_root);
mutex_unlock(&fs_info->chunk_mutex);
- BUG_ON(ret);
+ if (ret) {
+ printk("btrfs: failed to read chunk tree on %s\n", sb->s_id);
+ goto fail_chunk_root;
+ }
btrfs_close_extra_devices(fs_devices);
@@ -1684,7 +1694,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
btrfs_super_root(disk_super),
blocksize, generation);
if (!tree_root->node)
- goto fail_sb_buffer;
+ goto fail_chunk_root;
ret = find_and_setup_root(tree_root, fs_info,
@@ -1753,6 +1763,8 @@ fail_extent_root:
free_extent_buffer(extent_root->node);
fail_tree_root:
free_extent_buffer(tree_root->node);
+fail_chunk_root:
+ free_extent_buffer(chunk_root->node);
fail_sys_array:
fail_sb_buffer:
btrfs_stop_workers(&fs_info->fixup_workers);
@@ -1823,9 +1835,10 @@ int write_all_supers(struct btrfs_root *root)
total_errors++;
continue;
}
- if (!dev->in_fs_metadata)
+ if (!dev->in_fs_metadata || !dev->writeable)
continue;
+ btrfs_set_stack_device_generation(dev_item, 0);
btrfs_set_stack_device_type(dev_item, dev->type);
btrfs_set_stack_device_id(dev_item, dev->devid);
btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
@@ -1834,6 +1847,7 @@ int write_all_supers(struct btrfs_root *root)
btrfs_set_stack_device_io_width(dev_item, dev->io_width);
btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
+ memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
flags = btrfs_super_flags(sb);
btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
@@ -1881,7 +1895,7 @@ int write_all_supers(struct btrfs_root *root)
dev = list_entry(cur, struct btrfs_device, dev_list);
if (!dev->bdev)
continue;
- if (!dev->in_fs_metadata)
+ if (!dev->in_fs_metadata || !dev->writeable)
continue;
BUG_ON(!dev->pending_io);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index af2de30..197422c 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -355,7 +355,7 @@ __btrfs_find_block_group(struct btrfs_root *root,
if (search_start) {
struct btrfs_block_group_cache *shint;
shint = btrfs_lookup_first_block_group(info, search_start);
- if (shint && block_group_bits(shint, data) && !shint->ro) {
+ if (shint && block_group_bits(shint, data)) {
spin_lock(&shint->lock);
used = btrfs_block_group_used(&shint->item);
if (used + shint->pinned + shint->reserved <
@@ -366,7 +366,7 @@ __btrfs_find_block_group(struct btrfs_root *root,
spin_unlock(&shint->lock);
}
}
- if (hint && !hint->ro && block_group_bits(hint, data)) {
+ if (hint && block_group_bits(hint, data)) {
spin_lock(&hint->lock);
used = btrfs_block_group_used(&hint->item);
if (used + hint->pinned + hint->reserved <
@@ -392,7 +392,7 @@ again:
last = cache->key.objectid + cache->key.offset;
used = btrfs_block_group_used(&cache->item);
- if (!cache->ro && block_group_bits(cache, data)) {
+ if (block_group_bits(cache, data)) {
free_check = div_factor(cache->key.offset, factor);
if (used + cache->pinned + cache->reserved <
free_check) {
@@ -1843,9 +1843,9 @@ static void set_block_group_readonly(struct btrfs_block_group_cache *cache)
spin_unlock(&cache->space_info->lock);
}
-static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags)
+u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
{
- u64 num_devices = root->fs_info->fs_devices->num_devices;
+ u64 num_devices = root->fs_info->fs_devices->rw_devices;
if (num_devices == 1)
flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0);
@@ -1877,13 +1877,11 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
{
struct btrfs_space_info *space_info;
u64 thresh;
- u64 start;
- u64 num_bytes;
int ret = 0;
mutex_lock(&extent_root->fs_info->chunk_mutex);
- flags = reduce_alloc_profile(extent_root, flags);
+ flags = btrfs_reduce_alloc_profile(extent_root, flags);
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {
@@ -1913,16 +1911,11 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
}
spin_unlock(&space_info->lock);
- ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags);
+ ret = btrfs_alloc_chunk(trans, extent_root, flags);
if (ret) {
printk("space info full %Lu\n", flags);
space_info->full = 1;
- goto out;
}
-
- ret = btrfs_make_block_group(trans, extent_root, 0, flags,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes);
- BUG_ON(ret);
out:
mutex_unlock(&extent_root->fs_info->chunk_mutex);
return ret;
@@ -3040,7 +3033,7 @@ static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans,
data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
}
again:
- data = reduce_alloc_profile(root, data);
+ data = btrfs_reduce_alloc_profile(root, data);
/*
* the only place that sets empty_size is btrfs_realloc_node, which
* is not called recursively on allocations
@@ -5136,7 +5129,8 @@ static int noinline relocate_one_path(struct btrfs_trans_handle *trans,
else
btrfs_node_key_to_cpu(eb, &keys[level], 0);
}
- if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
+ if (nodes[0] &&
+ ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
eb = path->nodes[0];
ret = replace_extents_in_leaf(trans, reloc_root, eb,
group, reloc_inode);
@@ -5377,7 +5371,7 @@ static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
u64 stripped = BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
- num_devices = root->fs_info->fs_devices->num_devices;
+ num_devices = root->fs_info->fs_devices->rw_devices;
if (num_devices == 1) {
stripped |= BTRFS_BLOCK_GROUP_DUP;
stripped = flags & ~stripped;
@@ -5801,6 +5795,8 @@ int btrfs_read_block_groups(struct btrfs_root *root)
BUG_ON(ret);
set_avail_alloc_bits(root->fs_info, cache->flags);
+ if (btrfs_chunk_readonly(root, cache->key.objectid))
+ set_block_group_readonly(cache);
}
ret = 0;
error:
@@ -5889,6 +5885,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
block_group->space_info->total_bytes -= block_group->key.offset;
block_group->space_info->bytes_readonly -= block_group->key.offset;
spin_unlock(&block_group->space_info->lock);
+ block_group->space_info->full = 0;
/*
memset(shrink_block_group, 0, sizeof(*shrink_block_group));
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 52863ce..f43df72 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -405,7 +405,7 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
devid = simple_strtoull(devstr, &end, 10);
printk(KERN_INFO "resizing devid %llu\n", devid);
}
- device = btrfs_find_device(root, devid, NULL);
+ device = btrfs_find_device(root, devid, NULL, NULL);
if (!device) {
printk(KERN_INFO "resizer unable to find device %llu\n", devid);
ret = -EINVAL;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 04a3bf8..92393cc 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -431,6 +431,11 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
if (error)
goto error_free_subvol_name;
+ if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
+ error = -EACCES;
+ goto error_close_devices;
+ }
+
bdev = fs_devices->latest_bdev;
s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
if (IS_ERR(s))
@@ -444,6 +449,7 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
goto error_close_devices;
}
+ btrfs_close_devices(fs_devices);
} else {
char b[BDEVNAME_SIZE];
@@ -512,6 +518,9 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
ret = btrfs_commit_super(root);
WARN_ON(ret);
} else {
+ if (root->fs_info->fs_devices->rw_devices == 0)
+ return -EACCES;
+
if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
return -EINVAL;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 80a2728..d6f1996 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -40,6 +40,12 @@ struct map_lookup {
struct btrfs_bio_stripe stripes[];
};
+static int init_first_rw_device(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_device *device);
+static int btrfs_relocate_sys_chunks(struct btrfs_root *root);
+
+
#define map_lookup_size(n) (sizeof(struct map_lookup) + \
(sizeof(struct btrfs_bio_stripe) * (n)))
@@ -69,25 +75,31 @@ static void unlock_chunks(struct btrfs_root *root)
int btrfs_cleanup_fs_uuids(void)
{
struct btrfs_fs_devices *fs_devices;
- struct list_head *uuid_cur;
- struct list_head *devices_cur;
struct btrfs_device *dev;
- list_for_each(uuid_cur, &fs_uuids) {
- fs_devices = list_entry(uuid_cur, struct btrfs_fs_devices,
- list);
+ while (!list_empty(&fs_uuids)) {
+ fs_devices = list_entry(fs_uuids.next,
+ struct btrfs_fs_devices, list);
+ list_del(&fs_devices->list);
while(!list_empty(&fs_devices->devices)) {
- devices_cur = fs_devices->devices.next;
- dev = list_entry(devices_cur, struct btrfs_device,
- dev_list);
+ dev = list_entry(fs_devices->devices.next,
+ struct btrfs_device, dev_list);
if (dev->bdev) {
close_bdev_excl(dev->bdev);
fs_devices->open_devices--;
}
+ fs_devices->num_devices--;
+ if (dev->writeable)
+ fs_devices->rw_devices--;
list_del(&dev->dev_list);
+ list_del(&dev->dev_alloc_list);
kfree(dev->name);
kfree(dev);
}
+ WARN_ON(fs_devices->num_devices);
+ WARN_ON(fs_devices->open_devices);
+ WARN_ON(fs_devices->rw_devices);
+ kfree(fs_devices);
}
return 0;
}
@@ -257,6 +269,9 @@ static noinline int device_list_add(const char *path,
disk_super->dev_item.uuid);
}
if (!device) {
+ if (fs_devices->opened)
+ return -EBUSY;
+
device = kzalloc(sizeof(*device), GFP_NOFS);
if (!device) {
/* we can safely leave the fs_devices entry around */
@@ -273,8 +288,9 @@ static noinline int device_list_add(const char *path,
kfree(device);
return -ENOMEM;
}
+ INIT_LIST_HEAD(&device->dev_alloc_list);
list_add(&device->dev_list, &fs_devices->devices);
- list_add(&device->dev_alloc_list, &fs_devices->alloc_list);
+ device->fs_devices = fs_devices;
fs_devices->num_devices++;
}
@@ -288,58 +304,94 @@ static noinline int device_list_add(const char *path,
int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
{
- struct list_head *head = &fs_devices->devices;
+ struct list_head *tmp;
struct list_head *cur;
struct btrfs_device *device;
+ int seed_devices = 0;
mutex_lock(&uuid_mutex);
again:
- list_for_each(cur, head) {
+ list_for_each_safe(cur, tmp, &fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
- if (!device->in_fs_metadata) {
- struct block_device *bdev;
- list_del(&device->dev_list);
- list_del(&device->dev_alloc_list);
+ if (device->in_fs_metadata)
+ continue;
+
+ if (device->bdev) {
+ close_bdev_excl(device->bdev);
+ device->bdev = NULL;
+ fs_devices->open_devices--;
+ }
+ if (device->writeable) {
+ list_del_init(&device->dev_alloc_list);
+ device->writeable = 0;
+ fs_devices->rw_devices--;
+ }
+ if (!seed_devices) {
+ list_del_init(&device->dev_list);
fs_devices->num_devices--;
- if (device->bdev) {
- bdev = device->bdev;
- fs_devices->open_devices--;
- mutex_unlock(&uuid_mutex);
- close_bdev_excl(bdev);
- mutex_lock(&uuid_mutex);
- }
kfree(device->name);
kfree(device);
- goto again;
}
}
+
+ if (fs_devices->seed) {
+ fs_devices = fs_devices->seed;
+ seed_devices = 1;
+ goto again;
+ }
+
mutex_unlock(&uuid_mutex);
return 0;
}
-int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
+static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
{
- struct list_head *head = &fs_devices->devices;
+ struct btrfs_fs_devices *seed_devices;
struct list_head *cur;
struct btrfs_device *device;
+again:
+ if (--fs_devices->opened > 0)
+ return 0;
- mutex_lock(&uuid_mutex);
- list_for_each(cur, head) {
+ list_for_each(cur, &fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
if (device->bdev) {
close_bdev_excl(device->bdev);
fs_devices->open_devices--;
}
+ if (device->writeable) {
+ list_del_init(&device->dev_alloc_list);
+ fs_devices->rw_devices--;
+ }
+
device->bdev = NULL;
+ device->writeable = 0;
device->in_fs_metadata = 0;
}
- fs_devices->mounted = 0;
- mutex_unlock(&uuid_mutex);
+ fs_devices->opened = 0;
+ fs_devices->seeding = 0;
+ fs_devices->sprouted = 0;
+
+ seed_devices = fs_devices->seed;
+ fs_devices->seed = NULL;
+ if (seed_devices) {
+ fs_devices = seed_devices;
+ goto again;
+ }
return 0;
}
-int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
- int flags, void *holder)
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
+{
+ int ret;
+
+ mutex_lock(&uuid_mutex);
+ ret = __btrfs_close_devices(fs_devices);
+ mutex_unlock(&uuid_mutex);
+ return ret;
+}
+
+int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, void *holder)
{
struct block_device *bdev;
struct list_head *head = &fs_devices->devices;
@@ -350,24 +402,18 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
struct btrfs_super_block *disk_super;
u64 latest_devid = 0;
u64 latest_transid = 0;
- u64 transid;
u64 devid;
+ int seeding = 1;
int ret = 0;
- mutex_lock(&uuid_mutex);
- if (fs_devices->mounted)
- goto out;
-
list_for_each(cur, head) {
device = list_entry(cur, struct btrfs_device, dev_list);
if (device->bdev)
continue;
-
if (!device->name)
continue;
- bdev = open_bdev_excl(device->name, flags, holder);
-
+ bdev = open_bdev_excl(device->name, MS_RDONLY, holder);
if (IS_ERR(bdev)) {
printk("open %s failed\n", device->name);
goto error;
@@ -387,16 +433,32 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
if (devid != device->devid)
goto error_brelse;
- transid = btrfs_super_generation(disk_super);
- if (!latest_transid || transid > latest_transid) {
+ if (memcmp(device->uuid, disk_super->dev_item.uuid,
+ BTRFS_UUID_SIZE))
+ goto error_brelse;
+
+ device->generation = btrfs_super_generation(disk_super);
+ if (!latest_transid || device->generation > latest_transid) {
latest_devid = devid;
- latest_transid = transid;
+ latest_transid = device->generation;
latest_bdev = bdev;
}
+ if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) {
+ device->writeable = 0;
+ } else {
+ device->writeable = !bdev_read_only(bdev);
+ seeding = 0;
+ }
+
device->bdev = bdev;
device->in_fs_metadata = 0;
fs_devices->open_devices++;
+ if (device->writeable) {
+ fs_devices->rw_devices++;
+ list_add(&device->dev_alloc_list,
+ &fs_devices->alloc_list);
+ }
continue;
error_brelse:
@@ -410,11 +472,32 @@ error:
ret = -EIO;
goto out;
}
- fs_devices->mounted = 1;
+ fs_devices->seeding = seeding;
+ fs_devices->opened = 1;
fs_devices->latest_bdev = latest_bdev;
fs_devices->latest_devid = latest_devid;
fs_devices->latest_trans = latest_transid;
+ fs_devices->total_rw_bytes = 0;
out:
+ return ret;
+}
+
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
+ int flags, void *holder)
+{
+ int ret;
+
+ mutex_lock(&uuid_mutex);
+ if (fs_devices->opened) {
+ if (fs_devices->sprouted) {
+ ret = -EBUSY;
+ } else {
+ fs_devices->opened++;
+ ret = 0;
+ }
+ } else {
+ ret = __btrfs_open_devices(fs_devices, holder);
+ }
mutex_unlock(&uuid_mutex);
return ret;
}
@@ -481,12 +564,12 @@ error:
*/
static noinline int find_free_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
- struct btrfs_path *path,
u64 num_bytes, u64 *start)
{
struct btrfs_key key;
struct btrfs_root *root = device->dev_root;
struct btrfs_dev_extent *dev_extent = NULL;
+ struct btrfs_path *path;
u64 hole_size = 0;
u64 last_byte = 0;
u64 search_start = 0;
@@ -496,8 +579,11 @@ static noinline int find_free_dev_extent(struct btrfs_trans_handle *trans,
int start_found;
struct extent_buffer *l;
- start_found = 0;
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
path->reada = 2;
+ start_found = 0;
/* FIXME use last free of some kind */
@@ -581,7 +667,6 @@ check_pending:
/* we have to make sure we didn't find an extent that has already
* been allocated by the map tree or the original allocation
*/
- btrfs_release_path(root, path);
BUG_ON(*start < search_start);
if (*start + num_bytes > search_end) {
@@ -589,10 +674,10 @@ check_pending:
goto error;
}
/* check for pending inserts here */
- return 0;
+ ret = 0;
error:
- btrfs_release_path(root, path);
+ btrfs_free_path(path);
return ret;
}
@@ -644,11 +729,10 @@ int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
return ret;
}
-int noinline btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
+int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 chunk_tree, u64 chunk_objectid,
- u64 chunk_offset,
- u64 num_bytes, u64 *start)
+ u64 chunk_offset, u64 start, u64 num_bytes)
{
int ret;
struct btrfs_path *path;
@@ -662,13 +746,8 @@ int noinline btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
- ret = find_free_dev_extent(trans, device, path, num_bytes, start);
- if (ret) {
- goto err;
- }
-
key.objectid = device->devid;
- key.offset = *start;
+ key.offset = start;
key.type = BTRFS_DEV_EXTENT_KEY;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(*extent));
@@ -687,7 +766,6 @@ int noinline btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
btrfs_set_dev_extent_length(leaf, extent, num_bytes);
btrfs_mark_buffer_dirty(leaf);
-err:
btrfs_free_path(path);
return ret;
}
@@ -735,12 +813,18 @@ error:
return ret;
}
-static noinline int find_next_devid(struct btrfs_root *root,
- struct btrfs_path *path, u64 *objectid)
+static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid)
{
int ret;
struct btrfs_key key;
struct btrfs_key found_key;
+ struct btrfs_path *path;
+
+ root = root->fs_info->chunk_root;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
@@ -763,7 +847,7 @@ static noinline int find_next_devid(struct btrfs_root *root,
}
ret = 0;
error:
- btrfs_release_path(root, path);
+ btrfs_free_path(path);
return ret;
}
@@ -781,7 +865,6 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
struct extent_buffer *leaf;
struct btrfs_key key;
unsigned long ptr;
- u64 free_devid = 0;
root = root->fs_info->chunk_root;
@@ -789,13 +872,9 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
- ret = find_next_devid(root, path, &free_devid);
- if (ret)
- goto out;
-
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
- key.offset = free_devid;
+ key.offset = device->devid;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(*dev_item));
@@ -805,8 +884,8 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
leaf = path->nodes[0];
dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
- device->devid = free_devid;
btrfs_set_device_id(leaf, dev_item, device->devid);
+ btrfs_set_device_generation(leaf, dev_item, 0);
btrfs_set_device_type(leaf, dev_item, device->type);
btrfs_set_device_io_align(leaf, dev_item, device->io_align);
btrfs_set_device_io_width(leaf, dev_item, device->io_width);
@@ -819,9 +898,11 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
ptr = (unsigned long)btrfs_device_uuid(dev_item);
write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
+ ptr = (unsigned long)btrfs_device_fsid(dev_item);
+ write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE);
btrfs_mark_buffer_dirty(leaf);
- ret = 0;
+ ret = 0;
out:
btrfs_free_path(path);
return ret;
@@ -832,11 +913,7 @@ static int btrfs_rm_dev_item(struct btrfs_root *root,
{
int ret;
struct btrfs_path *path;
- struct block_device *bdev = device->bdev;
- struct btrfs_device *next_dev;
struct btrfs_key key;
- u64 total_bytes;
- struct btrfs_fs_devices *fs_devices;
struct btrfs_trans_handle *trans;
root = root->fs_info->chunk_root;
@@ -863,25 +940,6 @@ static int btrfs_rm_dev_item(struct btrfs_root *root,
ret = btrfs_del_item(trans, root, path);
if (ret)
goto out;
-
- /*
- * at this point, the device is zero sized. We want to
- * remove it from the devices list and zero out the old super
- */
- list_del_init(&device->dev_list);
- list_del_init(&device->dev_alloc_list);
- fs_devices = root->fs_info->fs_devices;
-
- next_dev = list_entry(fs_devices->devices.next, struct btrfs_device,
- dev_list);
- if (bdev == root->fs_info->sb->s_bdev)
- root->fs_info->sb->s_bdev = next_dev->bdev;
- if (bdev == fs_devices->latest_bdev)
- fs_devices->latest_bdev = next_dev->bdev;
-
- total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy);
- btrfs_set_super_num_devices(&root->fs_info->super_copy,
- total_bytes - 1);
out:
btrfs_free_path(path);
unlock_chunks(root);
@@ -892,11 +950,14 @@ out:
int btrfs_rm_device(struct btrfs_root *root, char *device_path)
{
struct btrfs_device *device;
+ struct btrfs_device *next_device;
struct block_device *bdev;
struct buffer_head *bh = NULL;
struct btrfs_super_block *disk_super;
u64 all_avail;
u64 devid;
+ u64 num_devices;
+ u8 *dev_uuid;
int ret = 0;
mutex_lock(&uuid_mutex);
@@ -907,14 +968,14 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
root->fs_info->avail_metadata_alloc_bits;
if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) &&
- btrfs_super_num_devices(&root->fs_info->super_copy) <= 4) {
+ root->fs_info->fs_devices->rw_devices <= 4) {
printk("btrfs: unable to go below four devices on raid10\n");
ret = -EINVAL;
goto out;
}
if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) &&
- btrfs_super_num_devices(&root->fs_info->super_copy) <= 2) {
+ root->fs_info->fs_devices->rw_devices <= 2) {
printk("btrfs: unable to go below two devices on raid1\n");
ret = -EINVAL;
goto out;
@@ -941,15 +1002,15 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
printk("btrfs: no missing devices found to remove\n");
goto out;
}
-
} else {
- bdev = open_bdev_excl(device_path, 0,
+ bdev = open_bdev_excl(device_path, MS_RDONLY,
root->fs_info->bdev_holder);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
goto out;
}
+ set_blocksize(bdev, 4096);
bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
if (!bh) {
ret = -EIO;
@@ -957,45 +1018,97 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
}
disk_super = (struct btrfs_super_block *)bh->b_data;
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
- sizeof(disk_super->magic))) {
- ret = -ENOENT;
- goto error_brelse;
- }
- if (memcmp(disk_super->fsid, root->fs_info->fsid,
- BTRFS_FSID_SIZE)) {
+ sizeof(disk_super->magic))) {
ret = -ENOENT;
goto error_brelse;
}
devid = le64_to_cpu(disk_super->dev_item.devid);
- device = btrfs_find_device(root, devid, NULL);
+ dev_uuid = disk_super->dev_item.uuid;
+ device = btrfs_find_device(root, devid, dev_uuid,
+ disk_super->fsid);
if (!device) {
ret = -ENOENT;
goto error_brelse;
}
+ }
+ if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) {
+ printk("btrfs: unable to remove the only writeable device\n");
+ ret = -EINVAL;
+ goto error_brelse;
+ }
+
+ if (device->writeable) {
+ list_del_init(&device->dev_alloc_list);
+ root->fs_info->fs_devices->rw_devices--;
}
- root->fs_info->fs_devices->num_devices--;
- root->fs_info->fs_devices->open_devices--;
ret = btrfs_shrink_device(device, 0);
if (ret)
goto error_brelse;
-
ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device);
if (ret)
goto error_brelse;
- if (bh) {
+ device->in_fs_metadata = 0;
+ if (device->fs_devices == root->fs_info->fs_devices) {
+ list_del_init(&device->dev_list);
+ root->fs_info->fs_devices->num_devices--;
+ if (device->bdev)
+ device->fs_devices->open_devices--;
+ }
+
+ next_device = list_entry(root->fs_info->fs_devices->devices.next,
+ struct btrfs_device, dev_list);
+ if (device->bdev == root->fs_info->sb->s_bdev)
+ root->fs_info->sb->s_bdev = next_device->bdev;
+ if (device->bdev == root->fs_info->fs_devices->latest_bdev)
+ root->fs_info->fs_devices->latest_bdev = next_device->bdev;
+
+ num_devices = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
+ btrfs_set_super_num_devices(&root->fs_info->super_copy, num_devices);
+
+ if (device->fs_devices != root->fs_info->fs_devices) {
+ BUG_ON(device->writeable);
+ brelse(bh);
+ if (bdev)
+ close_bdev_excl(bdev);
+
+ if (device->bdev) {
+ close_bdev_excl(device->bdev);
+ device->bdev = NULL;
+ device->fs_devices->open_devices--;
+ }
+ if (device->fs_devices->open_devices == 0) {
+ struct btrfs_fs_devices *fs_devices;
+ fs_devices = root->fs_info->fs_devices;
+ while (fs_devices) {
+ if (fs_devices->seed == device->fs_devices)
+ break;
+ fs_devices = fs_devices->seed;
+ }
+ fs_devices->seed = device->fs_devices->seed;
+ device->fs_devices->seed = NULL;
+ __btrfs_close_devices(device->fs_devices);
+ }
+ ret = 0;
+ goto out;
+ }
+
+ /*
+ * at this point, the device is zero sized. We want to
+ * remove it from the devices list and zero out the old super
+ */
+ if (device->writeable) {
/* make sure this device isn't detected as part of
* the FS anymore
*/
memset(&disk_super->magic, 0, sizeof(disk_super->magic));
set_buffer_dirty(bh);
sync_dirty_buffer(bh);
-
- brelse(bh);
}
+ brelse(bh);
if (device->bdev) {
/* one close for the device struct or super_block */
@@ -1021,6 +1134,129 @@ out:
return ret;
}
+/*
+ * does all the dirty work required for changing file system's UUID.
+ */
+static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
+ struct btrfs_fs_devices *old_devices;
+ struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
+ struct btrfs_device *device;
+ u64 super_flags;
+
+ BUG_ON(!mutex_is_locked(&uuid_mutex));
+ if (!fs_devices->seeding || fs_devices->opened != 1)
+ return -EINVAL;
+
+ old_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
+ if (!old_devices)
+ return -ENOMEM;
+
+ memcpy(old_devices, fs_devices, sizeof(*old_devices));
+ old_devices->opened = 1;
+ old_devices->sprouted = 1;
+ INIT_LIST_HEAD(&old_devices->devices);
+ INIT_LIST_HEAD(&old_devices->alloc_list);
+ list_splice_init(&fs_devices->devices, &old_devices->devices);
+ list_splice_init(&fs_devices->alloc_list, &old_devices->alloc_list);
+ list_for_each_entry(device, &old_devices->devices, dev_list) {
+ device->fs_devices = old_devices;
+ }
+ list_add(&old_devices->list, &fs_uuids);
+
+ fs_devices->seeding = 0;
+ fs_devices->num_devices = 0;
+ fs_devices->open_devices = 0;
+ fs_devices->seed = old_devices;
+
+ generate_random_uuid(fs_devices->fsid);
+ memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
+ memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
+ super_flags = btrfs_super_flags(disk_super) &
+ ~BTRFS_SUPER_FLAG_SEEDING;
+ btrfs_set_super_flags(disk_super, super_flags);
+
+ return 0;
+}
+
+/*
+ * strore the expected generation for seed devices in device items.
+ */
+static int btrfs_finish_sprout(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_dev_item *dev_item;
+ struct btrfs_device *device;
+ struct btrfs_key key;
+ u8 fs_uuid[BTRFS_UUID_SIZE];
+ u8 dev_uuid[BTRFS_UUID_SIZE];
+ u64 devid;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ root = root->fs_info->chunk_root;
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.offset = 0;
+ key.type = BTRFS_DEV_ITEM_KEY;
+
+ while (1) {
+ ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
+ if (ret < 0)
+ goto error;
+
+ leaf = path->nodes[0];
+next_slot:
+ if (path->slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret > 0)
+ break;
+ if (ret < 0)
+ goto error;
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ btrfs_release_path(root, path);
+ continue;
+ }
+
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID ||
+ key.type != BTRFS_DEV_ITEM_KEY)
+ break;
+
+ dev_item = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_dev_item);
+ devid = btrfs_device_id(leaf, dev_item);
+ read_extent_buffer(leaf, dev_uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+ read_extent_buffer(leaf, fs_uuid,
+ (unsigned long)btrfs_device_fsid(dev_item),
+ BTRFS_UUID_SIZE);
+ device = btrfs_find_device(root, devid, dev_uuid, fs_uuid);
+ BUG_ON(!device);
+
+ if (device->fs_devices->seeding) {
+ btrfs_set_device_generation(leaf, dev_item,
+ device->generation);
+ btrfs_mark_buffer_dirty(leaf);
+ }
+
+ path->slots[0]++;
+ goto next_slot;
+ }
+ ret = 0;
+error:
+ btrfs_free_path(path);
+ return ret;
+}
+
int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
{
struct btrfs_trans_handle *trans;
@@ -1028,26 +1264,34 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
struct block_device *bdev;
struct list_head *cur;
struct list_head *devices;
+ struct super_block *sb = root->fs_info->sb;
u64 total_bytes;
+ int seeding_dev = 0;
int ret = 0;
+ if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding)
+ return -EINVAL;
bdev = open_bdev_excl(device_path, 0, root->fs_info->bdev_holder);
if (!bdev) {
return -EIO;
}
+ if (root->fs_info->fs_devices->seeding) {
+ seeding_dev = 1;
+ down_write(&sb->s_umount);
+ mutex_lock(&uuid_mutex);
+ }
+
filemap_write_and_wait(bdev->bd_inode->i_mapping);
mutex_lock(&root->fs_info->volume_mutex);
- trans = btrfs_start_transaction(root, 1);
- lock_chunks(root);
devices = &root->fs_info->fs_devices->devices;
list_for_each(cur, devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
if (device->bdev == bdev) {
ret = -EEXIST;
- goto out;
+ goto error;
}
}
@@ -1055,18 +1299,31 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
if (!device) {
/* we can safely leave the fs_devices entry around */
ret = -ENOMEM;
- goto out_close_bdev;
+ goto error;
}
- device->barriers = 1;
- device->work.func = pending_bios_fn;
- generate_random_uuid(device->uuid);
- spin_lock_init(&device->io_lock);
device->name = kstrdup(device_path, GFP_NOFS);
if (!device->name) {
kfree(device);
- goto out_close_bdev;
+ ret = -ENOMEM;
+ goto error;
}
+
+ ret = find_next_devid(root, &device->devid);
+ if (ret) {
+ kfree(device);
+ goto error;
+ }
+
+ trans = btrfs_start_transaction(root, 1);
+ lock_chunks(root);
+
+ device->barriers = 1;
+ device->writeable = 1;
+ device->work.func = pending_bios_fn;
+ generate_random_uuid(device->uuid);
+ spin_lock_init(&device->io_lock);
+ device->generation = trans->transid;
device->io_width = root->sectorsize;
device->io_align = root->sectorsize;
device->sector_size = root->sectorsize;
@@ -1074,12 +1331,22 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
device->dev_root = root->fs_info->dev_root;
device->bdev = bdev;
device->in_fs_metadata = 1;
+ set_blocksize(device->bdev, 4096);
- ret = btrfs_add_device(trans, root, device);
- if (ret)
- goto out_close_bdev;
+ if (seeding_dev) {
+ sb->s_flags &= ~MS_RDONLY;
+ ret = btrfs_prepare_sprout(trans, root);
+ BUG_ON(ret);
+ }
- set_blocksize(device->bdev, 4096);
+ device->fs_devices = root->fs_info->fs_devices;
+ list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
+ list_add(&device->dev_alloc_list,
+ &root->fs_info->fs_devices->alloc_list);
+ root->fs_info->fs_devices->num_devices++;
+ root->fs_info->fs_devices->open_devices++;
+ root->fs_info->fs_devices->rw_devices++;
+ root->fs_info->fs_devices->total_rw_bytes += device->total_bytes;
total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
btrfs_set_super_total_bytes(&root->fs_info->super_copy,
@@ -1089,20 +1356,34 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
btrfs_set_super_num_devices(&root->fs_info->super_copy,
total_bytes + 1);
- list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
- list_add(&device->dev_alloc_list,
- &root->fs_info->fs_devices->alloc_list);
- root->fs_info->fs_devices->num_devices++;
- root->fs_info->fs_devices->open_devices++;
-out:
+ if (seeding_dev) {
+ ret = init_first_rw_device(trans, root, device);
+ BUG_ON(ret);
+ ret = btrfs_finish_sprout(trans, root);
+ BUG_ON(ret);
+ } else {
+ ret = btrfs_add_device(trans, root, device);
+ }
+
unlock_chunks(root);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->volume_mutex);
+ btrfs_commit_transaction(trans, root);
- return ret;
+ if (seeding_dev) {
+ mutex_unlock(&uuid_mutex);
+ up_write(&sb->s_umount);
-out_close_bdev:
+ ret = btrfs_relocate_sys_chunks(root);
+ BUG_ON(ret);
+ }
+out:
+ mutex_unlock(&root->fs_info->volume_mutex);
+ return ret;
+error:
close_bdev_excl(bdev);
+ if (seeding_dev) {
+ mutex_unlock(&uuid_mutex);
+ up_write(&sb->s_umount);
+ }
goto out;
}
@@ -1160,7 +1441,15 @@ static int __btrfs_grow_device(struct btrfs_trans_handle *trans,
u64 old_total = btrfs_super_total_bytes(super_copy);
u64 diff = new_size - device->total_bytes;
+ if (!device->writeable)
+ return -EACCES;
+ if (new_size <= device->total_bytes)
+ return -EINVAL;
+
btrfs_set_super_total_bytes(super_copy, old_total + diff);
+ device->fs_devices->total_rw_bytes += diff;
+
+ device->total_bytes = new_size;
return btrfs_update_device(trans, device);
}
@@ -1248,7 +1537,6 @@ int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64
return ret;
}
-
int btrfs_relocate_chunk(struct btrfs_root *root,
u64 chunk_tree, u64 chunk_objectid,
u64 chunk_offset)
@@ -1328,6 +1616,64 @@ int btrfs_relocate_chunk(struct btrfs_root *root,
return 0;
}
+static int btrfs_relocate_sys_chunks(struct btrfs_root *root)
+{
+ struct btrfs_root *chunk_root = root->fs_info->chunk_root;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_chunk *chunk;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ u64 chunk_tree = chunk_root->root_key.objectid;
+ u64 chunk_type;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
+ key.offset = (u64)-1;
+ key.type = BTRFS_CHUNK_ITEM_KEY;
+
+ while (1) {
+ ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
+ if (ret < 0)
+ goto error;
+ BUG_ON(ret == 0);
+
+ ret = btrfs_previous_item(chunk_root, path, key.objectid,
+ key.type);
+ if (ret < 0)
+ goto error;
+ if (ret > 0)
+ break;
+
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+
+ chunk = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_chunk);
+ chunk_type = btrfs_chunk_type(leaf, chunk);
+ btrfs_release_path(chunk_root, path);
+
+ if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) {
+ ret = btrfs_relocate_chunk(chunk_root, chunk_tree,
+ found_key.objectid,
+ found_key.offset);
+ BUG_ON(ret);
+ }
+
+ if (found_key.offset == 0)
+ break;
+ key.offset = found_key.offset - 1;
+ }
+ ret = 0;
+error:
+ btrfs_free_path(path);
+ return ret;
+}
+
static u64 div_factor(u64 num, int factor)
{
if (factor == 10)
@@ -1337,7 +1683,6 @@ static u64 div_factor(u64 num, int factor)
return num;
}
-
int btrfs_balance(struct btrfs_root *dev_root)
{
int ret;
@@ -1353,6 +1698,8 @@ int btrfs_balance(struct btrfs_root *dev_root)
struct btrfs_trans_handle *trans;
struct btrfs_key found_key;
+ if (dev_root->fs_info->sb->s_flags & MS_RDONLY)
+ return -EROFS;
mutex_lock(&dev_root->fs_info->volume_mutex);
dev_root = dev_root->fs_info->dev_root;
@@ -1363,7 +1710,8 @@ int btrfs_balance(struct btrfs_root *dev_root)
old_size = device->total_bytes;
size_to_free = div_factor(old_size, 1);
size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
- if (device->total_bytes - device->bytes_used > size_to_free)
+ if (!device->writeable ||
+ device->total_bytes - device->bytes_used > size_to_free)
continue;
ret = btrfs_shrink_device(device, old_size - size_to_free);
@@ -1453,6 +1801,8 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
u64 old_total = btrfs_super_total_bytes(super_copy);
u64 diff = device->total_bytes - new_size;
+ if (new_size >= device->total_bytes)
+ return -EINVAL;
path = btrfs_alloc_path();
if (!path)
@@ -1469,6 +1819,8 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
lock_chunks(root);
device->total_bytes = new_size;
+ if (device->writeable)
+ device->fs_devices->total_rw_bytes -= diff;
ret = btrfs_update_device(trans, device);
if (ret) {
unlock_chunks(root);
@@ -1561,32 +1913,27 @@ static u64 noinline chunk_bytes_by_type(u64 type, u64 calc_size,
return calc_size * num_stripes;
}
-
-int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, u64 *start,
- u64 *num_bytes, u64 type)
+static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root,
+ struct map_lookup **map_ret,
+ u64 *num_bytes, u64 *stripe_size,
+ u64 start, u64 type)
{
- u64 dev_offset;
struct btrfs_fs_info *info = extent_root->fs_info;
- struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
- struct btrfs_path *path;
- struct btrfs_stripe *stripes;
struct btrfs_device *device = NULL;
- struct btrfs_chunk *chunk;
- struct list_head private_devs;
- struct list_head *dev_list;
+ struct btrfs_fs_devices *fs_devices = info->fs_devices;
struct list_head *cur;
+ struct map_lookup *map = NULL;
struct extent_map_tree *em_tree;
- struct map_lookup *map;
struct extent_map *em;
+ struct list_head private_devs;
int min_stripe_size = 1 * 1024 * 1024;
- u64 physical;
u64 calc_size = 1024 * 1024 * 1024;
u64 max_chunk_size = calc_size;
u64 min_free;
u64 avail;
u64 max_avail = 0;
- u64 percent_max;
+ u64 dev_offset;
int num_stripes = 1;
int min_stripes = 1;
int sub_stripes = 0;
@@ -1594,19 +1941,17 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
int ret;
int index;
int stripe_len = 64 * 1024;
- struct btrfs_key key;
if ((type & BTRFS_BLOCK_GROUP_RAID1) &&
(type & BTRFS_BLOCK_GROUP_DUP)) {
WARN_ON(1);
type &= ~BTRFS_BLOCK_GROUP_DUP;
}
- dev_list = &extent_root->fs_info->fs_devices->alloc_list;
- if (list_empty(dev_list))
+ if (list_empty(&fs_devices->alloc_list))
return -ENOSPC;
if (type & (BTRFS_BLOCK_GROUP_RAID0)) {
- num_stripes = extent_root->fs_info->fs_devices->open_devices;
+ num_stripes = fs_devices->rw_devices;
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_DUP)) {
@@ -1614,14 +1959,13 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID1)) {
- num_stripes = min_t(u64, 2,
- extent_root->fs_info->fs_devices->open_devices);
+ num_stripes = min_t(u64, 2, fs_devices->rw_devices);
if (num_stripes < 2)
return -ENOSPC;
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
- num_stripes = extent_root->fs_info->fs_devices->open_devices;
+ num_stripes = fs_devices->rw_devices;
if (num_stripes < 4)
return -ENOSPC;
num_stripes &= ~(u32)1;
@@ -1641,15 +1985,19 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
min_stripe_size = 1 * 1024 * 1024;
}
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
-
- /* we don't want a chunk larger than 10% of the FS */
- percent_max = div_factor(btrfs_super_total_bytes(&info->super_copy), 1);
- max_chunk_size = min(percent_max, max_chunk_size);
+ /* we don't want a chunk larger than 10% of writeable space */
+ max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1),
+ max_chunk_size);
again:
+ if (!map || map->num_stripes != num_stripes) {
+ kfree(map);
+ map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
+ if (!map)
+ return -ENOMEM;
+ map->num_stripes = num_stripes;
+ }
+
if (calc_size * num_stripes > max_chunk_size) {
calc_size = max_chunk_size;
do_div(calc_size, num_stripes);
@@ -1662,8 +2010,7 @@ again:
do_div(calc_size, stripe_len);
calc_size *= stripe_len;
- INIT_LIST_HEAD(&private_devs);
- cur = dev_list->next;
+ cur = fs_devices->alloc_list.next;
index = 0;
if (type & BTRFS_BLOCK_GROUP_DUP)
@@ -1679,10 +2026,10 @@ again:
if (!looped)
min_free += 1024 * 1024;
- /* build a private list of devices we will allocate from */
+ INIT_LIST_HEAD(&private_devs);
while(index < num_stripes) {
device = list_entry(cur, struct btrfs_device, dev_alloc_list);
-
+ BUG_ON(!device->writeable);
if (device->total_bytes > device->bytes_used)
avail = device->total_bytes - device->bytes_used;
else
@@ -1690,24 +2037,28 @@ again:
cur = cur->next;
if (device->in_fs_metadata && avail >= min_free) {
- u64 ignored_start = 0;
- ret = find_free_dev_extent(trans, device, path,
- min_free,
- &ignored_start);
+ ret = find_free_dev_extent(trans, device,
+ min_free, &dev_offset);
if (ret == 0) {
list_move_tail(&device->dev_alloc_list,
&private_devs);
+ map->stripes[index].dev = device;
+ map->stripes[index].physical = dev_offset;
index++;
- if (type & BTRFS_BLOCK_GROUP_DUP)
+ if (type & BTRFS_BLOCK_GROUP_DUP) {
+ map->stripes[index].dev = device;
+ map->stripes[index].physical =
+ dev_offset + calc_size;
index++;
+ }
}
} else if (device->in_fs_metadata && avail > max_avail)
max_avail = avail;
- if (cur == dev_list)
+ if (cur == &fs_devices->alloc_list)
break;
}
+ list_splice(&private_devs, &fs_devices->alloc_list);
if (index < num_stripes) {
- list_splice(&private_devs, dev_list);
if (index >= min_stripes) {
num_stripes = index;
if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
@@ -1722,115 +2073,246 @@ again:
calc_size = max_avail;
goto again;
}
- btrfs_free_path(path);
+ kfree(map);
return -ENOSPC;
}
- key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
- key.type = BTRFS_CHUNK_ITEM_KEY;
- ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
- &key.offset);
- if (ret) {
- btrfs_free_path(path);
- return ret;
- }
+ map->sector_size = extent_root->sectorsize;
+ map->stripe_len = stripe_len;
+ map->io_align = stripe_len;
+ map->io_width = stripe_len;
+ map->type = type;
+ map->num_stripes = num_stripes;
+ map->sub_stripes = sub_stripes;
- chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS);
- if (!chunk) {
- btrfs_free_path(path);
- return -ENOMEM;
- }
+ *map_ret = map;
+ *stripe_size = calc_size;
+ *num_bytes = chunk_bytes_by_type(type, calc_size,
+ num_stripes, sub_stripes);
- map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
- if (!map) {
- kfree(chunk);
- btrfs_free_path(path);
+ em = alloc_extent_map(GFP_NOFS);
+ if (!em) {
+ kfree(map);
return -ENOMEM;
}
- btrfs_free_path(path);
- path = NULL;
+ em->bdev = (struct block_device *)map;
+ em->start = start;
+ em->len = *num_bytes;
+ em->block_start = 0;
+ em->block_len = em->len;
- stripes = &chunk->stripe;
- *num_bytes = chunk_bytes_by_type(type, calc_size,
- num_stripes, sub_stripes);
+ em_tree = &extent_root->fs_info->mapping_tree.map_tree;
+ spin_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em);
+ spin_unlock(&em_tree->lock);
+ BUG_ON(ret);
+ free_extent_map(em);
- index = 0;
- while(index < num_stripes) {
- struct btrfs_stripe *stripe;
- BUG_ON(list_empty(&private_devs));
- cur = private_devs.next;
- device = list_entry(cur, struct btrfs_device, dev_alloc_list);
+ ret = btrfs_make_block_group(trans, extent_root, 0, type,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ start, *num_bytes);
+ BUG_ON(ret);
- /* loop over this device again if we're doing a dup group */
- if (!(type & BTRFS_BLOCK_GROUP_DUP) ||
- (index == num_stripes - 1))
- list_move_tail(&device->dev_alloc_list, dev_list);
+ index = 0;
+ while (index < map->num_stripes) {
+ device = map->stripes[index].dev;
+ dev_offset = map->stripes[index].physical;
ret = btrfs_alloc_dev_extent(trans, device,
- info->chunk_root->root_key.objectid,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset,
- calc_size, &dev_offset);
+ info->chunk_root->root_key.objectid,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ start, dev_offset, calc_size);
BUG_ON(ret);
- device->bytes_used += calc_size;
+ index++;
+ }
+
+ return 0;
+}
+
+static int __finish_chunk_alloc(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root,
+ struct map_lookup *map, u64 chunk_offset,
+ u64 chunk_size, u64 stripe_size)
+{
+ u64 dev_offset;
+ struct btrfs_key key;
+ struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
+ struct btrfs_device *device;
+ struct btrfs_chunk *chunk;
+ struct btrfs_stripe *stripe;
+ size_t item_size = btrfs_chunk_item_size(map->num_stripes);
+ int index = 0;
+ int ret;
+
+ chunk = kzalloc(item_size, GFP_NOFS);
+ if (!chunk)
+ return -ENOMEM;
+
+ index = 0;
+ while (index < map->num_stripes) {
+ device = map->stripes[index].dev;
+ device->bytes_used += stripe_size;
ret = btrfs_update_device(trans, device);
BUG_ON(ret);
+ index++;
+ }
+
+ index = 0;
+ stripe = &chunk->stripe;
+ while (index < map->num_stripes) {
+ device = map->stripes[index].dev;
+ dev_offset = map->stripes[index].physical;
- map->stripes[index].dev = device;
- map->stripes[index].physical = dev_offset;
- stripe = stripes + index;
btrfs_set_stack_stripe_devid(stripe, device->devid);
btrfs_set_stack_stripe_offset(stripe, dev_offset);
memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE);
- physical = dev_offset;
+ stripe++;
index++;
}
- BUG_ON(!list_empty(&private_devs));
- /* key was set above */
- btrfs_set_stack_chunk_length(chunk, *num_bytes);
+ btrfs_set_stack_chunk_length(chunk, chunk_size);
btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
- btrfs_set_stack_chunk_stripe_len(chunk, stripe_len);
- btrfs_set_stack_chunk_type(chunk, type);
- btrfs_set_stack_chunk_num_stripes(chunk, num_stripes);
- btrfs_set_stack_chunk_io_align(chunk, stripe_len);
- btrfs_set_stack_chunk_io_width(chunk, stripe_len);
+ btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len);
+ btrfs_set_stack_chunk_type(chunk, map->type);
+ btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes);
+ btrfs_set_stack_chunk_io_align(chunk, map->stripe_len);
+ btrfs_set_stack_chunk_io_width(chunk, map->stripe_len);
btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
- btrfs_set_stack_chunk_sub_stripes(chunk, sub_stripes);
- map->sector_size = extent_root->sectorsize;
- map->stripe_len = stripe_len;
- map->io_align = stripe_len;
- map->io_width = stripe_len;
- map->type = type;
- map->num_stripes = num_stripes;
- map->sub_stripes = sub_stripes;
+ btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes);
- ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
- btrfs_chunk_item_size(num_stripes));
- BUG_ON(ret);
- *start = key.offset;;
+ key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
+ key.type = BTRFS_CHUNK_ITEM_KEY;
+ key.offset = chunk_offset;
- em = alloc_extent_map(GFP_NOFS);
- if (!em)
- return -ENOMEM;
- em->bdev = (struct block_device *)map;
- em->start = key.offset;
- em->len = *num_bytes;
- em->block_start = 0;
- em->block_len = em->len;
+ ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size);
+ BUG_ON(ret);
- if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
- ret = btrfs_add_system_chunk(trans, chunk_root, &key,
- chunk, btrfs_chunk_item_size(num_stripes));
+ if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
+ ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk,
+ item_size);
BUG_ON(ret);
}
kfree(chunk);
+ return 0;
+}
- em_tree = &extent_root->fs_info->mapping_tree.map_tree;
- spin_lock(&em_tree->lock);
- ret = add_extent_mapping(em_tree, em);
- spin_unlock(&em_tree->lock);
+/*
+ * Chunk allocation falls into two parts. The first part does works
+ * that make the new allocated chunk useable, but not do any operation
+ * that modifies the chunk tree. The second part does the works that
+ * require modifying the chunk tree. This division is important for the
+ * bootstrap process of adding storage to a seed btrfs.
+ */
+int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root, u64 type)
+{
+ u64 chunk_offset;
+ u64 chunk_size;
+ u64 stripe_size;
+ struct map_lookup *map;
+ struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
+ int ret;
+
+ ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ &chunk_offset);
+ if (ret)
+ return ret;
+
+ ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size,
+ &stripe_size, chunk_offset, type);
+ if (ret)
+ return ret;
+
+ ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset,
+ chunk_size, stripe_size);
BUG_ON(ret);
+ return 0;
+}
+
+static int noinline init_first_rw_device(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_device *device)
+{
+ u64 chunk_offset;
+ u64 sys_chunk_offset;
+ u64 chunk_size;
+ u64 sys_chunk_size;
+ u64 stripe_size;
+ u64 sys_stripe_size;
+ u64 alloc_profile;
+ struct map_lookup *map;
+ struct map_lookup *sys_map;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_root *extent_root = fs_info->extent_root;
+ int ret;
+
+ ret = find_next_chunk(fs_info->chunk_root,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset);
+ BUG_ON(ret);
+
+ alloc_profile = BTRFS_BLOCK_GROUP_METADATA |
+ (fs_info->metadata_alloc_profile &
+ fs_info->avail_metadata_alloc_bits);
+ alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile);
+
+ ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size,
+ &stripe_size, chunk_offset, alloc_profile);
+ BUG_ON(ret);
+
+ sys_chunk_offset = chunk_offset + chunk_size;
+
+ alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM |
+ (fs_info->system_alloc_profile &
+ fs_info->avail_system_alloc_bits);
+ alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile);
+
+ ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map,
+ &sys_chunk_size, &sys_stripe_size,
+ sys_chunk_offset, alloc_profile);
+ BUG_ON(ret);
+
+ ret = btrfs_add_device(trans, fs_info->chunk_root, device);
+ BUG_ON(ret);
+
+ /*
+ * Modifying chunk tree needs allocating new blocks from both
+ * system block group and metadata block group. So we only can
+ * do operations require modifying the chunk tree after both
+ * block groups were created.
+ */
+ ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset,
+ chunk_size, stripe_size);
+ BUG_ON(ret);
+
+ ret = __finish_chunk_alloc(trans, extent_root, sys_map,
+ sys_chunk_offset, sys_chunk_size,
+ sys_stripe_size);
+ BUG_ON(ret);
+ return 0;
+}
+
+int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
+{
+ struct extent_map *em;
+ struct map_lookup *map;
+ struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
+ int readonly = 0;
+ int i;
+
+ spin_lock(&map_tree->map_tree.lock);
+ em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
+ spin_unlock(&map_tree->map_tree.lock);
+ if (!em)
+ return 1;
+
+ map = (struct map_lookup *)em->bdev;
+ for (i = 0; i < map->num_stripes; i++) {
+ if (!map->stripes[i].dev->writeable) {
+ readonly = 1;
+ break;
+ }
+ }
free_extent_map(em);
- return ret;
+ return readonly;
}
void btrfs_mapping_init(struct btrfs_mapping_tree *tree)
@@ -2227,6 +2709,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
}
bio->bi_sector = multi->stripes[dev_nr].physical >> 9;
dev = multi->stripes[dev_nr].dev;
+ BUG_ON(rw == WRITE && !dev->writeable);
if (dev && dev->bdev) {
bio->bi_bdev = dev->bdev;
if (async_submit)
@@ -2246,11 +2729,23 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
}
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
- u8 *uuid)
+ u8 *uuid, u8 *fsid)
{
- struct list_head *head = &root->fs_info->fs_devices->devices;
-
- return __find_device(head, devid, uuid);
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *cur_devices;
+
+ cur_devices = root->fs_info->fs_devices;
+ while (cur_devices) {
+ if (!fsid ||
+ !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
+ device = __find_device(&cur_devices->devices,
+ devid, uuid);
+ if (device)
+ return device;
+ }
+ cur_devices = cur_devices->seed;
+ }
+ return NULL;
}
static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
@@ -2262,8 +2757,6 @@ static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
device = kzalloc(sizeof(*device), GFP_NOFS);
list_add(&device->dev_list,
&fs_devices->devices);
- list_add(&device->dev_alloc_list,
- &fs_devices->alloc_list);
device->barriers = 1;
device->dev_root = root->fs_info->dev_root;
device->devid = devid;
@@ -2274,7 +2767,6 @@ static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
return device;
}
-
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk)
@@ -2339,8 +2831,8 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
read_extent_buffer(leaf, uuid, (unsigned long)
btrfs_stripe_dev_uuid_nr(chunk, i),
BTRFS_UUID_SIZE);
- map->stripes[i].dev = btrfs_find_device(root, devid, uuid);
-
+ map->stripes[i].dev = btrfs_find_device(root, devid, uuid,
+ NULL);
if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) {
kfree(map);
free_extent_map(em);
@@ -2387,6 +2879,50 @@ static int fill_device_from_item(struct extent_buffer *leaf,
return 0;
}
+static int open_seed_devices(struct btrfs_root *root, u8 *fsid)
+{
+ struct btrfs_fs_devices *fs_devices;
+ int ret;
+
+ mutex_lock(&uuid_mutex);
+
+ fs_devices = root->fs_info->fs_devices->seed;
+ while (fs_devices) {
+ if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
+ ret = 0;
+ goto out;
+ }
+ fs_devices = fs_devices->seed;
+ }
+
+ fs_devices = find_fsid(fsid);
+ if (!fs_devices) {
+ ret = -ENOENT;
+ goto out;
+ }
+ if (fs_devices->opened) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ ret = __btrfs_open_devices(fs_devices, root->fs_info->bdev_holder);
+ if (ret)
+ goto out;
+
+ if (!fs_devices->seeding) {
+ __btrfs_close_devices(fs_devices);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ fs_devices->seed = root->fs_info->fs_devices->seed;
+ root->fs_info->fs_devices->seed = fs_devices;
+ fs_devices->sprouted = 1;
+out:
+ mutex_unlock(&uuid_mutex);
+ return ret;
+}
+
static int read_one_dev(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_dev_item *dev_item)
@@ -2394,23 +2930,50 @@ static int read_one_dev(struct btrfs_root *root,
struct btrfs_device *device;
u64 devid;
int ret;
+ int seed_devices = 0;
+ u8 fs_uuid[BTRFS_UUID_SIZE];
u8 dev_uuid[BTRFS_UUID_SIZE];
devid = btrfs_device_id(leaf, dev_item);
read_extent_buffer(leaf, dev_uuid,
(unsigned long)btrfs_device_uuid(dev_item),
BTRFS_UUID_SIZE);
- device = btrfs_find_device(root, devid, dev_uuid);
- if (!device) {
- printk("warning devid %Lu missing\n", devid);
- device = add_missing_dev(root, devid, dev_uuid);
- if (!device)
- return -ENOMEM;
+ read_extent_buffer(leaf, fs_uuid,
+ (unsigned long)btrfs_device_fsid(dev_item),
+ BTRFS_UUID_SIZE);
+
+ if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) {
+ ret = open_seed_devices(root, fs_uuid);
+ if (ret)
+ return ret;
+ seed_devices = 1;
+ }
+
+ device = btrfs_find_device(root, devid, dev_uuid, fs_uuid);
+ if (!device || !device->bdev) {
+ if (!btrfs_test_opt(root, DEGRADED) || seed_devices)
+ return -EIO;
+
+ if (!device) {
+ printk("warning devid %Lu missing\n", devid);
+ device = add_missing_dev(root, devid, dev_uuid);
+ if (!device)
+ return -ENOMEM;
+ }
+ }
+
+ if (device->fs_devices != root->fs_info->fs_devices) {
+ BUG_ON(device->writeable);
+ if (device->generation !=
+ btrfs_device_generation(leaf, dev_item))
+ return -EINVAL;
}
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
device->in_fs_metadata = 1;
+ if (device->writeable)
+ device->fs_devices->total_rw_bytes += device->total_bytes;
ret = 0;
#if 0
ret = btrfs_open_device(device);
@@ -2528,12 +3091,15 @@ again:
dev_item = btrfs_item_ptr(leaf, slot,
struct btrfs_dev_item);
ret = read_one_dev(root, leaf, dev_item);
- BUG_ON(ret);
+ if (ret)
+ goto error;
}
} else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
struct btrfs_chunk *chunk;
chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
ret = read_one_chunk(root, &found_key, leaf, chunk);
+ if (ret)
+ goto error;
}
path->slots[0]++;
}
@@ -2542,9 +3108,8 @@ again:
btrfs_release_path(root, path);
goto again;
}
-
- btrfs_free_path(path);
ret = 0;
error:
+ btrfs_free_path(path);
return ret;
}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index c50e505..1f6f25a 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -26,6 +26,7 @@ struct buffer_head;
struct btrfs_device {
struct list_head dev_list;
struct list_head dev_alloc_list;
+ struct btrfs_fs_devices *fs_devices;
struct btrfs_root *dev_root;
struct buffer_head *pending_io;
struct bio *pending_bios;
@@ -34,6 +35,7 @@ struct btrfs_device {
u64 generation;
int barriers;
+ int writeable;
int in_fs_metadata;
spinlock_t io_lock;
@@ -77,6 +79,8 @@ struct btrfs_fs_devices {
u64 latest_trans;
u64 num_devices;
u64 open_devices;
+ u64 rw_devices;
+ u64 total_rw_bytes;
struct block_device *latest_bdev;
/* all of the devices in the FS */
struct list_head devices;
@@ -84,7 +88,12 @@ struct btrfs_fs_devices {
/* devices not currently being allocated */
struct list_head alloc_list;
struct list_head list;
- int mounted;
+
+ struct btrfs_fs_devices *seed;
+ int seeding;
+ int sprouted;
+
+ int opened;
};
struct btrfs_bio_stripe {
@@ -109,16 +118,14 @@ struct btrfs_multi_bio {
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 chunk_tree, u64 chunk_objectid,
- u64 chunk_offset,
- u64 num_bytes, u64 *start);
+ u64 chunk_offset, u64 start, u64 num_bytes);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
u64 logical, u64 *length,
struct btrfs_multi_bio **multi_ret, int mirror_num);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, u64 *start,
- u64 *num_bytes, u64 type);
+ struct btrfs_root *extent_root, u64 type);
void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
@@ -141,10 +148,11 @@ int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
int btrfs_grow_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device, u64 new_size);
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
- u8 *uuid);
+ u8 *uuid, u8 *fsid);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_root *root, char *path);
int btrfs_balance(struct btrfs_root *dev_root);
void btrfs_unlock_volumes(void);
void btrfs_lock_volumes(void);
+int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
#endif
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