On Sun, Aug 01, 2004 at 01:15:18PM +0530, Suparna Bhattacharya wrote:
> 
> The attached patches (generated against 2.6.8-rc2) enable concurrent 
> O_SYNC writers to different parts of the same file by avoiding 
> serialising on i_sem across the wait for IO completion.
> 
> This is mostly your work, ported to the tagged radix tree VFS changes
> and a few fixes. I have been carrying these patches for sometime now; 
> they can be the merged upstream. Please apply.
> 

[3] fix-writepages-range.patch

Regards
Suparna

-- 
Suparna Bhattacharya (suparna@in.ibm.com)
Linux Technology Center
IBM Software Lab, India

---------------------------------------------------------------

Safeguard to make sure we break out of pagevec_lookup_tag loop if we
are beyond the specified range.

Signed-off-by: Suparna Bhattacharya <suparna@in.ibm.com>

 linux-2.6.8-rc2-suparna/fs/mpage.c      |    3 ++-
 linux-2.6.8-rc2-suparna/fs/mpage.c.orig |    3 +--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff -puN fs/mpage.c~fix-writepages-range fs/mpage.c
--- linux-2.6.8-rc2/fs/mpage.c~fix-writepages-range	2004-08-01 12:33:10.000000000 +0530
+++ linux-2.6.8-rc2-suparna/fs/mpage.c	2004-08-01 12:33:10.000000000 +0530
@@ -649,7 +649,8 @@ mpage_writepages(struct address_space *m
 		scanned = 1;
 	}
 retry:
-	while (!done && (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+	while (!done && (index <= end) &&
+			(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 			PAGECACHE_TAG_DIRTY,
 			min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
 		unsigned i;
diff -puN fs/mpage.c.orig~fix-writepages-range fs/mpage.c.orig
--- linux-2.6.8-rc2/fs/mpage.c.orig~fix-writepages-range	2004-08-01 12:33:10.000000000 +0530
+++ linux-2.6.8-rc2-suparna/fs/mpage.c.orig	2004-08-01 12:32:43.000000000 +0530
@@ -649,8 +649,7 @@ mpage_writepages(struct address_space *m
 		scanned = 1;
 	}
 retry:
-	while (!done && (index <= end) && 
-			(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+	while (!done && (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 			PAGECACHE_TAG_DIRTY,
 			min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
 		unsigned i;
_
-
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