diff options
| author | Josef Bacik <josef@redhat.com> | 2010-02-02 21:19:11 +0000 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-03-15 11:00:13 -0400 |
| commit | c2a128d28a2e78e159e17e8c9274d0a9d9492555 (patch) | |
| tree | de2a9aab9c2037aa027f598e66006de7b8cf70cd | |
| parent | 49958fd7dbb83cd4d65179d025940e01fe1fbacd (diff) | |
| download | linux-c2a128d28a2e78e159e17e8c9274d0a9d9492555.tar.bz2 | |
Btrfs: cache extent state in find_delalloc_range
This patch makes us cache the extent state we find in find_delalloc_range since
we'll have to lock the extent later on in the function. This will keep us from
re-searching for the rang when we try to lock the extent.
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/extent_io.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 355a973719a0..3c17c9eb0d98 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1171,7 +1171,8 @@ out: * 1 is returned if we find something, 0 if nothing was in the tree */ static noinline u64 find_delalloc_range(struct extent_io_tree *tree, - u64 *start, u64 *end, u64 max_bytes) + u64 *start, u64 *end, u64 max_bytes, + struct extent_state **cached_state) { struct rb_node *node; struct extent_state *state; @@ -1203,8 +1204,11 @@ static noinline u64 find_delalloc_range(struct extent_io_tree *tree, *end = state->end; goto out; } - if (!found) + if (!found) { *start = state->start; + *cached_state = state; + atomic_inc(&state->refs); + } found++; *end = state->end; cur_start = state->end + 1; @@ -1336,10 +1340,11 @@ again: delalloc_start = *start; delalloc_end = 0; found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, - max_bytes); + max_bytes, &cached_state); if (!found || delalloc_end <= *start) { *start = delalloc_start; *end = delalloc_end; + free_extent_state(cached_state); return found; } |