From: Steven Whitehouse <swhiteho@redhat.com>
To: linux-kernel@vger.kernel.org, cluster-devel@redhat.com
Cc: Steven Whitehouse <swhiteho@redhat.com>
Subject: [PATCH 17/32] GFS2: Improve bug trap code in ->releasepage()
Date: Thu, 19 May 2011 09:47:12 +0100 [thread overview]
Message-ID: <1305794847-3291-18-git-send-email-swhiteho@redhat.com> (raw)
In-Reply-To: <1305794847-3291-1-git-send-email-swhiteho@redhat.com>
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;
--
1.7.4
next prev parent reply other threads:[~2011-05-19 9:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-19 8:46 GFS2: Pre-pull patch posting (merge window) Steven Whitehouse
2011-05-19 8:46 ` [PATCH 01/32] GFS2: Dump better debug info if a bitmap inconsistency is detected Steven Whitehouse
2011-05-19 8:46 ` [PATCH 02/32] GFS2: remove *leaf_call_t and simplify leaf_dealloc Steven Whitehouse
2011-05-19 8:46 ` [PATCH 03/32] GFS2: Combine transaction from gfs2_dir_exhash_dealloc Steven Whitehouse
2011-05-19 8:46 ` [PATCH 04/32] GFS2: pass leaf_bh into leaf_dealloc Steven Whitehouse
2011-05-19 8:47 ` [PATCH 05/32] GFS2: move function foreach_leaf to gfs2_dir_exhash_dealloc Steven Whitehouse
2011-05-19 8:47 ` [PATCH 06/32] GFS2: Make ->write_inode() really write Steven Whitehouse
2011-05-19 8:47 ` [PATCH 07/32] GFS2: Use filemap_fdatawrite() to write back the AIL Steven Whitehouse
2011-05-19 8:47 ` [PATCH 08/32] GFS2: Alter point of entry to glock lru list for glocks with an address_space Steven Whitehouse
2011-05-19 8:47 ` [PATCH 09/32] GFS2: Remove unused macro Steven Whitehouse
2011-05-19 8:47 ` [PATCH 10/32] GFS2: Clean up fsync() Steven Whitehouse
2011-05-19 8:47 ` [PATCH 11/32] GFS2: Improve tracing support (adds two flags) Steven Whitehouse
2011-05-19 8:47 ` [PATCH 12/32] GFS2: Optimise glock lru and end of life inodes Steven Whitehouse
2011-05-19 8:47 ` [PATCH 13/32] GFS2: Make writeback more responsive to system conditions Steven Whitehouse
2011-05-19 8:47 ` [PATCH 14/32] GFS2: Add an AIL writeback tracepoint Steven Whitehouse
2011-05-19 8:47 ` [PATCH 15/32] GFS2: make sure fallocate bytes is a multiple of blksize Steven Whitehouse
2011-05-19 8:47 ` [PATCH 16/32] GFS2: Fix ail list traversal Steven Whitehouse
2011-05-19 8:47 ` Steven Whitehouse [this message]
2011-05-19 8:47 ` [PATCH 18/32] GFS2: Double check link count under glock Steven Whitehouse
2011-05-19 8:47 ` [PATCH 19/32] GFS2: Don't use a try lock when promoting to a higher mode Steven Whitehouse
2011-05-19 8:47 ` [PATCH 20/32] GFS2: Don't use gfs2_change_nlink in link syscall Steven Whitehouse
2011-05-19 8:47 ` [PATCH 21/32] GFS2: Make gfs2_dir_del update link count when required Steven Whitehouse
2011-05-19 8:47 ` [PATCH 22/32] GFS2: When adding a new dir entry, inc link count if it is a subdir Steven Whitehouse
2011-05-19 8:47 ` [PATCH 23/32] GFS2: Remove gfs2_dinode_print() function Steven Whitehouse
2011-05-19 8:47 ` [PATCH 24/32] GFS2: Move gfs2_refresh_inode() and friends into glops.c Steven Whitehouse
2011-05-19 8:47 ` [PATCH 25/32] GFS2: Move most of the remaining inode.c into ops_inode.c Steven Whitehouse
2011-05-19 8:47 ` [PATCH 26/32] GFS2: Move final part of inode.c into super.c Steven Whitehouse
2011-05-19 8:47 ` [PATCH 27/32] GFS2: Inode.c is empty now, remove it Steven Whitehouse
2011-05-19 8:47 ` [PATCH 28/32] GFS2: Rename ops_inode.c to inode.c Steven Whitehouse
2011-05-19 8:47 ` [PATCH 29/32] GFS2: Use UUID field in generic superblock Steven Whitehouse
2011-05-19 8:47 ` [PATCH 30/32] GFS2: Clean up mkdir Steven Whitehouse
2011-05-19 8:47 ` [PATCH 31/32] GFS2: Clean up symlink creation Steven Whitehouse
2011-05-19 8:47 ` [PATCH 32/32] GFS2: Move all locking inside the inode creation function Steven Whitehouse
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