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Subject[PATCH 12/21] fat: Kill d_invalidate() in vfat_lookup()
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d_invalidate() for positive dentry doesn't work in some cases
(vfsmount, nfsd, and maybe others). shrink_dcache_parent() by
d_invalidate() is pointless for vfat usage at all.

So, this kills it, and intead of it uses d_move().

To save old behavior, this returns alias simply for directory (don't
change pwd, etc..). the directory lookup shouldn't be important for
performance.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
---
fs/fat/namei_vfat.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff -puN fs/fat/namei_vfat.c~vfat-dcache-d_invalidate-fix fs/fat/namei_vfat.c
--- linux-2.6/fs/fat/namei_vfat.c~vfat-dcache-d_invalidate-fix 2008-08-27 19:18:24.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/namei_vfat.c 2008-08-27 19:18:24.000000000 +0900
@@ -745,13 +745,12 @@ static struct dentry *vfat_lookup(struct
*
* Switch to new one for reason of locality if possible.
*/
- if (d_invalidate(alias) == 0)
- dput(alias);
- else {
- iput(inode);
- unlock_super(sb);
- return alias;
- }
+ BUG_ON(d_unhashed(alias));
+ if (!S_ISDIR(inode->i_mode))
+ d_move(alias, dentry);
+ iput(inode);
+ unlock_super(sb);
+ return alias;
}
out:
unlock_super(sb);
_

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