On Mon, Nov 06, 2006 at 05:15:27PM -0600, Eric Sandeen wrote:
> Christoph Hellwig wrote:
> > On Mon, Nov 06, 2006 at 03:50:02PM -0600, Eric Sandeen wrote:
> >> so I would propose the following patch to make PAGE_CACHE_SIZE the default (again),
> >> and let filesystems which need something -else- do that on their own.
> >
> > I agree with the conclusion, but the patch is incomplete. You went down
> > all the way to find out what the fileystems do in this messages, so add
> > the hunks to override the defaults for non-standard filesystems to the
> > patch aswell to restore the pre-inode diet state.
>
> Well, agreed. I put 80% or more back to pre-patch state, but not all.
> :) So it's less broken with my patch than without, so at least it's
> moving forward. So... Ted's patches get in w/o fixing up all the other
> filesystems (left as an exercise to the patch reader) but mine can't? :)
Note that *I* wasn't the one who changed it from PAGE_CACHE_SIZE to (1
<< inode->i_blkbits). This was done by Andrew. (See below, from an
e-mail dated September 19th).
Given that Steve French was cc'ed, I assume this was done as a hack to
fix CIFS, but it was a bad idea; I agree that PAGE_CACHE_SIZE is a way
better default than (1 << inode->i_blkbits).
As far as fixing all of the other filesystems, I did *try*; I know I
screwed up with XFS, but that's because I still think the code is a
screaming horror of indirections that make it impossible to understand
what the heck is going on, and I guess I screwed up with CIFS. Some
of the changes away from "pre inode diet" state were deliberate,
though, since some filesystems had very clearly broken "optimal I/O
sizes" of 512, and one even had something incredibly bogus that was
something like 96 bytes (!) if I remember correctly.
- Ted
Subject: inode-diet-eliminate-i_blksize-and-use-a-per-superblock-default-fix-fix
From: Andrew Morton <akpm@xxxxxxxx>
Cc: <sbenni@xxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Steven French <sfrench@xxxxxxxxxx>,
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/stat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN
fs/stat.c~inode-diet-eliminate-i_blksize-and-use-a-per-superblock-default-fix-fi
x fs/stat.c
---
a/fs/stat.c~inode-diet-eliminate-i_blksize-and-use-a-per-superblock-default-fix-
fix
+++ a/fs/stat.c
@@ -33,7 +33,7 @@ void generic_fillattr(struct inode *inod
stat->ctime = inode->i_ctime;
stat->size = i_size_read(inode);
stat->blocks = inode->i_blocks;
- stat->blksize = PAGE_CACHE_SIZE;
+ stat->blksize = (1 << inode->i_blkbits);
}
EXPORT_SYMBOL(generic_fillattr);
_
-
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