diff options
| author | Chris Mason <chris.mason@oracle.com> | 2007-05-01 08:53:32 -0400 |
|---|---|---|
| committer | David Woodhouse <dwmw2@hera.kernel.org> | 2007-05-01 08:53:32 -0400 |
| commit | 090d18753c7fb73f7d846c3a89a50cd35136d144 (patch) | |
| tree | e36965065fd68633c06cbe4b8312e5afe49997f4 /fs/btrfs/disk-io.c | |
| parent | 31f3c99b73483f7b738a886c552050cbd6128ff3 (diff) | |
Btrfs: directory readahead
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index e1b6e13a5ae..354524adf98 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -5,6 +5,7 @@ #include <linux/scatterlist.h> #include <linux/swap.h> #include <linux/radix-tree.h> +#include <linux/file.h> #include "ctree.h" #include "disk-io.h" #include "transaction.h" @@ -253,6 +254,29 @@ static struct address_space_operations btree_aops = { .sync_page = block_sync_page, }; +int readahead_tree_block(struct btrfs_root *root, u64 blocknr) +{ + struct buffer_head *bh = NULL; + + bh = btrfs_find_create_tree_block(root, blocknr); + if (!bh) + return 0; + if (buffer_uptodate(bh)) + goto done; + if (test_set_buffer_locked(bh)) + goto done; + if (!buffer_uptodate(bh)) { + get_bh(bh); + bh->b_end_io = end_buffer_read_sync; + submit_bh(READ, bh); + } else { + unlock_buffer(bh); + } +done: + brelse(bh); + return 0; +} + struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr) { struct buffer_head *bh = NULL; @@ -270,11 +294,14 @@ struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr) wait_on_buffer(bh); if (!buffer_uptodate(bh)) goto fail; - csum_tree_block(root, bh, 1); } else { unlock_buffer(bh); } uptodate: + if (!buffer_checked(bh)) { + csum_tree_block(root, bh, 1); + set_buffer_checked(bh); + } if (check_tree_block(root, bh)) BUG(); return bh; |