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| author | Josef Bacik <jbacik@fusionio.com> | 2013-06-29 23:15:19 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-21 18:21:31 -0700 |
| commit | c701343cd0444bd9440a4236331e80f45c75ece2 (patch) | |
| tree | edb845742a6f7584157d58544c5dc9a3e383b63c | |
| parent | 8049d11b3af40dc43b45017a1646ee6bd02287a1 (diff) | |
| download | linux-3.10-c701343cd0444bd9440a4236331e80f45c75ece2.tar.gz linux-3.10-c701343cd0444bd9440a4236331e80f45c75ece2.tar.bz2 linux-3.10-c701343cd0444bd9440a4236331e80f45c75ece2.zip | |
Btrfs: hold the tree mod lock in __tree_mod_log_rewind
commit f1ca7e98a67da618d8595866e0860308525154da upstream.
We need to hold the tree mod log lock in __tree_mod_log_rewind since we walk
forward in the tree mod entries, otherwise we'll end up with random entries and
trip the BUG_ON() at the front of __tree_mod_log_rewind. This fixes the panics
people were seeing when running
find /whatever -type f -exec btrfs fi defrag {} \;
Thansk,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/btrfs/ctree.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 02fae7f7e42..2543d11b7d8 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1161,8 +1161,8 @@ __tree_mod_log_oldest_root(struct btrfs_fs_info *fs_info, * time_seq). */ static void -__tree_mod_log_rewind(struct extent_buffer *eb, u64 time_seq, - struct tree_mod_elem *first_tm) +__tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct extent_buffer *eb, + u64 time_seq, struct tree_mod_elem *first_tm) { u32 n; struct rb_node *next; @@ -1172,6 +1172,7 @@ __tree_mod_log_rewind(struct extent_buffer *eb, u64 time_seq, unsigned long p_size = sizeof(struct btrfs_key_ptr); n = btrfs_header_nritems(eb); + tree_mod_log_read_lock(fs_info); while (tm && tm->seq >= time_seq) { /* * all the operations are recorded with the operator used for @@ -1226,6 +1227,7 @@ __tree_mod_log_rewind(struct extent_buffer *eb, u64 time_seq, if (tm->index != first_tm->index) break; } + tree_mod_log_read_unlock(fs_info); btrfs_set_header_nritems(eb, n); } @@ -1274,7 +1276,7 @@ tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct extent_buffer *eb, extent_buffer_get(eb_rewin); btrfs_tree_read_lock(eb_rewin); - __tree_mod_log_rewind(eb_rewin, time_seq, tm); + __tree_mod_log_rewind(fs_info, eb_rewin, time_seq, tm); WARN_ON(btrfs_header_nritems(eb_rewin) > BTRFS_NODEPTRS_PER_BLOCK(fs_info->tree_root)); @@ -1350,7 +1352,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq) btrfs_set_header_generation(eb, old_generation); } if (tm) - __tree_mod_log_rewind(eb, time_seq, tm); + __tree_mod_log_rewind(root->fs_info, eb, time_seq, tm); else WARN_ON(btrfs_header_level(eb) != 0); WARN_ON(btrfs_header_nritems(eb) > BTRFS_NODEPTRS_PER_BLOCK(root)); |