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| author | Josef Bacik <jbacik@fb.com> | 2015-09-15 10:07:04 -0400 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-09-22 10:22:56 -0700 |
| commit | 2b9dbef272b63c561aab0a5be34fd428f7b710f5 (patch) | |
| tree | 3b0f2a78c1f601e79a10e902037254a67a70d3b0 /fs/btrfs/transaction.h | |
| parent | 50745b0a7f46f68574cd2b9ae24566bf026e7ebd (diff) | |
| download | lwn-2b9dbef272b63c561aab0a5be34fd428f7b710f5.tar.gz lwn-2b9dbef272b63c561aab0a5be34fd428f7b710f5.zip | |
Btrfs: keep dropped roots in cache until transaction commit
When dropping a snapshot we need to account for the qgroup changes. If we drop
the snapshot in all one go then the backref code will fail to find blocks from
the snapshot we dropped since it won't be able to find the root in the fs root
cache. This can lead to us failing to find refs from other roots that pointed
at blocks in the now deleted root. To handle this we need to not remove the fs
roots from the cache until after we process the qgroup operations. Do this by
adding dropped roots to a list on the transaction, and letting the transaction
remove the roots at the same time it drops the commit roots. This will keep all
of the backref searching code in sync properly, and fixes a problem Mark was
seeing with snapshot delete and qgroups. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Tested-by: Holger Hoffstätte <holger.hoffstaette@googlemail.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/transaction.h')
| -rw-r--r-- | fs/btrfs/transaction.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h index edc2fbc262d7..87964bf8892d 100644 --- a/fs/btrfs/transaction.h +++ b/fs/btrfs/transaction.h @@ -65,6 +65,7 @@ struct btrfs_transaction { struct list_head switch_commits; struct list_head dirty_bgs; struct list_head io_bgs; + struct list_head dropped_roots; u64 num_dirty_bgs; /* @@ -76,6 +77,7 @@ struct btrfs_transaction { spinlock_t dirty_bgs_lock; struct list_head deleted_bgs; spinlock_t deleted_bgs_lock; + spinlock_t dropped_roots_lock; struct btrfs_delayed_ref_root delayed_refs; int aborted; int dirty_bg_run; @@ -216,5 +218,6 @@ int btrfs_transaction_blocked(struct btrfs_fs_info *info); int btrfs_transaction_in_commit(struct btrfs_fs_info *info); void btrfs_put_transaction(struct btrfs_transaction *transaction); void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); - +void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, + struct btrfs_root *root); #endif |