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btrfs: fall back to global reservation when removing subvolumes 

I recently did some ENOSPC testing that involved filling the disk
while create and removing snapshots in a loop. During the test cycle,
I ran into an ENOSPC when trying to remove a snapshot, leaving the fs
stuck in ENOSPC even after a umount/mount cycle.

This patch allow subvolume removal to fall back onto the global
block reservation in order to succeed when it would have failed
otherwise.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Jeff Mahoney 2013-07-09 16:37:21 -04:00 committed by Chris Mason
parent 74be951087
commit ee3441b490
3 changed files with 12 additions and 5 deletions
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2
fs/btrfs/ctree.h
View File

@ -3175,7 +3175,7 @@ void btrfs_orphan_release_metadata(struct inode *inode);
int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
struct btrfs_block_rsv *rsv,
int nitems,
u64 *qgroup_reserved);
u64 *qgroup_reserved, bool use_global_rsv);
void btrfs_subvolume_release_metadata(struct btrfs_root *root,
struct btrfs_block_rsv *rsv,
u64 qgroup_reserved);

8
fs/btrfs/extent-tree.c
View File

@ -4742,10 +4742,12 @@ void btrfs_orphan_release_metadata(struct inode *inode)
int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
struct btrfs_block_rsv *rsv,
int items,
u64 *qgroup_reserved)
u64 *qgroup_reserved,
bool use_global_rsv)
{
u64 num_bytes;
int ret;
struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv;
if (root->fs_info->quota_enabled) {
/* One for parent inode, two for dir entries */
@ -4764,6 +4766,10 @@ int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
BTRFS_BLOCK_GROUP_METADATA);
ret = btrfs_block_rsv_add(root, rsv, num_bytes,
BTRFS_RESERVE_FLUSH_ALL);
if (ret == -ENOSPC && use_global_rsv)
ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes);
if (ret) {
if (*qgroup_reserved)
btrfs_qgroup_free(root, *qgroup_reserved);

7
fs/btrfs/ioctl.c
View File

@ -396,7 +396,7 @@ static noinline int create_subvol(struct inode *dir,
* of create_snapshot().
*/
ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
7, &qgroup_reserved);
7, &qgroup_reserved, false);
if (ret)
return ret;
@ -576,7 +576,8 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
*/
ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
&pending_snapshot->block_rsv, 7,
&pending_snapshot->qgroup_reserved);
&pending_snapshot->qgroup_reserved,
false);
if (ret)
goto out;
@ -2174,7 +2175,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
* ref/backref.
*/
err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
5, &qgroup_reserved);
5, &qgroup_reserved, true);
if (err)
goto out_up_write;