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| author | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-10-23 11:28:27 +0200 |
|---|---|---|
| committer | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-10-24 12:36:38 +0200 |
| commit | 5b6602e762cae17c8891d19698afea451e9c1d95 (patch) | |
| tree | d7a4ccfc3d56e3c94d1fab3efcd14464e3df357e /fs | |
| parent | 834328a8493079d15f30866ace42489463f52571 (diff) | |
| download | linux-5b6602e762cae17c8891d19698afea451e9c1d95.tar.gz linux-5b6602e762cae17c8891d19698afea451e9c1d95.tar.bz2 linux-5b6602e762cae17c8891d19698afea451e9c1d95.zip | |
Btrfs: determine level of old roots
In btrfs_find_all_roots' termination condition, we compare the level of the
old buffer we got from btrfs_search_old_slot to the level of the current
root node. We'd better compare it to the level of the rewinded root node.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/backref.c | 4 | ||||
| -rw-r--r-- | fs/btrfs/ctree.c | 17 | ||||
| -rw-r--r-- | fs/btrfs/ctree.h | 1 |
3 files changed, 19 insertions, 3 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index f3187938e081..65608fbf2232 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -283,9 +283,7 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info, goto out; } - rcu_read_lock(); - root_level = btrfs_header_level(root->node); - rcu_read_unlock(); + root_level = btrfs_old_root_level(root, time_seq); if (root_level + 1 == level) goto out; diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index d9308c38a8f2..ef68c33eefd9 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1297,6 +1297,23 @@ get_old_root(struct btrfs_root *root, u64 time_seq) return eb; } +int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq) +{ + struct tree_mod_elem *tm; + int level; + + tm = __tree_mod_log_oldest_root(root->fs_info, root, time_seq); + if (tm && tm->op == MOD_LOG_ROOT_REPLACE) { + level = tm->old_root.level; + } else { + rcu_read_lock(); + level = btrfs_header_level(root->node); + rcu_read_unlock(); + } + + return level; +} + static inline int should_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct extent_buffer *buf) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 1630be831210..34c5a442dd33 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3120,6 +3120,7 @@ static inline u64 btrfs_inc_tree_mod_seq(struct btrfs_fs_info *fs_info) { return atomic_inc_return(&fs_info->tree_mod_seq); } +int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq); /* root-item.c */ int btrfs_find_root_ref(struct btrfs_root *tree_root, |