FAQ Search Today's Posts Mark Forums Read
» Video Reviews

» Linux Archive

Linux-archive is a website aiming to archive linux email lists and to make them easily accessible for linux users/developers.


» Sponsor

» Partners

» Sponsor

Go Back   Linux Archive > Redhat > Cluster Development

 
 
LinkBack Thread Tools
 
Old 04-19-2011, 11:21 AM
Steven Whitehouse
 
Default GFS2: Improve bug trap code in ->releasepage()

If the buffer is dirty or pinned, then as well as printing a
warning, we should also refuse to release the page in
question.

Currently this can occur if there is a race between mmap()ed
writers and O_DIRECT on the same file. With the addition of
->launder_page() in the future, we should be able to close
this gap.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 0f5c4f9..802ac5e 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -1076,8 +1076,8 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
bd = bh->b_private;
if (bd && bd->bd_ail)
goto cannot_release;
- gfs2_assert_warn(sdp, !buffer_pinned(bh));
- gfs2_assert_warn(sdp, !buffer_dirty(bh));
+ if (buffer_pinned(bh) || buffer_dirty(bh))
+ goto not_possible;
bh = bh->b_this_page;
} while(bh != head);
gfs2_log_unlock(sdp);
@@ -1107,6 +1107,10 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
} while (bh != head);

return try_to_free_buffers(page);
+
+not_possible: /* Should never happen */
+ WARN_ON(buffer_dirty(bh));
+ WARN_ON(buffer_pinned(bh));
cannot_release:
gfs2_log_unlock(sdp);
return 0;
 

Thread Tools




All times are GMT. The time now is 07:27 AM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.
Copyright 2007 - 2008, www.linux-archive.org