diff options
| -rw-r--r-- | fs/btrfs/ctree.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index e1e942e1918f..13d4833afcd3 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1390,12 +1390,13 @@ static noinline void unlock_up(struct btrfs_path *path, int level, } /* - * helper function for btrfs_search_slot. The goal is to find a block - * in cache without setting the path to blocking. If we find the block - * we return zero and the path is unchanged. + * Helper function for btrfs_search_slot() and other functions that do a search + * on a btree. The goal is to find a tree block in the cache (the radix tree at + * fs_info->buffer_radix), but if we can't find it, or it's not up to date, read + * its pages from disk. * - * If we can't find the block, we set the path blocking and do some - * reada. -EAGAIN is returned and the search must be repeated. + * Returns -EAGAIN, with the path unlocked, if the caller needs to repeat the + * whole btree search, starting again from the current root node. */ static int read_block_for_search(struct btrfs_root *root, struct btrfs_path *p, |