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authorAndrew Morton <akpm@osdl.org>2006-03-23 06:00:11 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 10:38:09 -0500
commitd8733c2956968a01394a4d2a9e97a8b431a78776 (patch)
tree9743c9020eb5193efa4a0f102b3a7eb1d999c4fd /include
parentb8e31edc10d160a8bf2159541d9d12f2079a0887 (diff)
[PATCH] ext3_readdir: use generic readahead
Linus points out that ext3_readdir's readahead only cuts in when ext3_readdir() is operating at the very start of the directory. So for large directories we end up performing no readahead at all and we suck. So take it all out and use the core VM's page_cache_readahead(). This means that ext3 directory reads will use all of readahead's dynamic sizing goop. Note that we're using the directory's filp->f_ra to hold the readahead state, but readahead is actually being performed against the underlying blockdev's address_space. Fortunately the readahead code is all set up to handle this. Tested with printk. It works. I was struggling to find a real workload which actually cared. (The patch also exports page_cache_readahead() to GPL modules) Cc: "Stephen C. Tweedie" <sct@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ext3_fs.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index c0272d73ab20..e7239f2f97a1 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -772,9 +772,12 @@ extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
772 772
773 773
774/* inode.c */ 774/* inode.c */
775extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int); 775int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
776extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *); 776struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
777extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *); 777struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
778int ext3_get_block_handle(handle_t *handle, struct inode *inode,
779 sector_t iblock, struct buffer_head *bh_result, int create,
780 int extend_disksize);
778 781
779extern void ext3_read_inode (struct inode *); 782extern void ext3_read_inode (struct inode *);
780extern int ext3_write_inode (struct inode *, int); 783extern int ext3_write_inode (struct inode *, int);