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readahead: combine file_ra_state.prev_index/prev_offset into prev_pos

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Combine the file_ra_state members
				unsigned long prev_index
				unsigned int prev_offset
into
				loff_t prev_pos

It is more consistent and better supports huge files.

Thanks to Peter for the nice proposal!

[[email protected]: fix shift overflow]
Cc: Peter Zijlstra <[email protected]>
Signed-off-by: Fengguang Wu <[email protected]>
Cc: Rusty Russell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Fengguang Wu 2007-10-16 01:24:33 -07:00 • committed by Linus Torvalds
commit f4e6b498d6
6 changed files with 19 additions and 18 deletions
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2
fs/ext4/dir.c
View file

@ -142,7 +142,7 @@ static int ext4_readdir(struct file * filp,
sb->s_bdev->bd_inode->i_mapping,
&filp->f_ra, filp,
index, 1);
filp->f_ra.prev_index = index;
filp->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
bh = ext4_bread(NULL, inode, blk, 0, &err);
}