Re: 2.5.70-mm2

[Andrew Morton (akpm@digeo.com)]

Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:
>
> 2.5.70-mm2 seems to hang while running LTP.

It is actually a VFS bug.  A brand new one.  Here's a fix, but we should
check that it still gets all the LTP writev cases right.

A couple of ext3 bugs in -mm2 have been fixed so please don't spend time
stresstesting it until mm3.

Thanks.



The recent writev() fix broke the invariant that ->commit_write _must_ be
called after a successful ->prepare_write().  It leaves ext3 with a
transaction stuck open and the filesystem locks up.




 mm/filemap.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff -puN mm/filemap.c~generic_file_write-commit_write-fix mm/filemap.c
--- 25/mm/filemap.c~generic_file_write-commit_write-fix	2003-05-30 04:01:19.000000000 -0700
+++ 25-akpm/mm/filemap.c	2003-05-30 04:04:11.000000000 -0700
@@ -1718,10 +1718,9 @@ generic_file_aio_write_nolock(struct kio
 			copied = filemap_copy_from_user_iovec(page, offset,
 						cur_iov, iov_base, bytes);
 		flush_dcache_page(page);
+		status = a_ops->commit_write(file, page, offset,
+						offset + copied);
 		if (likely(copied > 0)) {
-			status = a_ops->commit_write(file, page, offset,
-						     offset + copied);
-
 			if (!status)
 				status = copied;
 

_

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