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authorSteven Whitehouse <swhiteho@redhat.com>2011-05-03 11:49:19 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2011-05-03 11:49:19 +0100
commit8f065d36508f283ee6cbeb05829f032d0b782a16 (patch)
tree3ebd2a660a5d13c773e16c024ce025df24a9b502 /fs/gfs2/aops.c
parent4f1de018215fb56940ce5793e11becd1e8cd6e44 (diff)
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>
Diffstat (limited to 'fs/gfs2/aops.c')
-rw-r--r--fs/gfs2/aops.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 0f5c4f9d5d6..802ac5eeba2 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;