Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=dc7868fcb9a73990e6f30371c1be465c436a7a7f
Commit: dc7868fcb9a73990e6f30371c1be465c436a7a7f
Parent: a08a166fe77d9f9ad88ed6d06b97e73453661f89
Author: Fengguang Wu <[EMAIL PROTECTED]>
AuthorDate: Thu Jul 19 01:48:04 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Jul 19 10:04:44 2007 -0700
readahead: convert ext3/ext4 invocations
Convert ext3/ext4 dir reads to use on-demand readahead.
Readahead for dirs operates _not_ on file level, but on blockdev level.
This
makes a difference when the data blocks are not continuous. And the read
routine is somehow opaque: there's no handy info about the status of current
page. So a simplified call scheme is employed: to call into readahead
whenever the current page falls out of readahead windows.
Signed-off-by: Fengguang Wu <[EMAIL PROTECTED]>
Cc: Steven Pratt <[EMAIL PROTECTED]>
Cc: Ram Pai <[EMAIL PROTECTED]>
Cc: Rusty Russell <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/ext3/dir.c | 14 ++++++++------
fs/ext4/dir.c | 14 ++++++++------
2 files changed, 16 insertions(+), 12 deletions(-)
diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c
index 8528698..3c6d384 100644
--- a/fs/ext3/dir.c
+++ b/fs/ext3/dir.c
@@ -136,12 +136,14 @@ static int ext3_readdir(struct file * filp,
err = ext3_get_blocks_handle(NULL, inode, blk, 1,
&map_bh, 0, 0);
if (err > 0) {
- page_cache_readahead(sb->s_bdev->bd_inode->i_mapping,
- &filp->f_ra,
- filp,
- map_bh.b_blocknr >>
- (PAGE_CACHE_SHIFT - inode->i_blkbits),
- 1);
+ pgoff_t index = map_bh.b_blocknr >>
+ (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ if (!ra_has_index(&filp->f_ra, index))
+ page_cache_readahead_ondemand(
+ sb->s_bdev->bd_inode->i_mapping,
+ &filp->f_ra, filp,
+ NULL, index, 1);
+ filp->f_ra.prev_index = index;
bh = ext3_bread(NULL, inode, blk, 0, &err);
}
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index e8ad06e..0a872a0 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -135,12 +135,14 @@ static int ext4_readdir(struct file * filp,
map_bh.b_state = 0;
err = ext4_get_blocks_wrap(NULL, inode, blk, 1, &map_bh, 0, 0);
if (err > 0) {
- page_cache_readahead(sb->s_bdev->bd_inode->i_mapping,
- &filp->f_ra,
- filp,
- map_bh.b_blocknr >>
- (PAGE_CACHE_SHIFT - inode->i_blkbits),
- 1);
+ pgoff_t index = map_bh.b_blocknr >>
+ (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ if (!ra_has_index(&filp->f_ra, index))
+ page_cache_readahead_ondemand(
+ sb->s_bdev->bd_inode->i_mapping,
+ &filp->f_ra, filp,
+ NULL, index, 1);
+ filp->f_ra.prev_index = index;
bh = ext4_bread(NULL, inode, blk, 0, &err);
}
-
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