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authorBenjamin Marzinski <bmarzins@redhat.com>2012-11-06 00:49:28 -0600
committerSteven Whitehouse <swhiteho@redhat.com>2012-11-07 09:42:49 +0000
commit3d1626889a64bd5a661544d582036a0a02104a60 (patch)
tree7b5d43873e088346175d982fd8e840be586fcb5e /fs/gfs2/super.c
parent076f0faa764ab3a5a32fc726ae05e2de0e66151d (diff)
downloadlinux-3d1626889a64bd5a661544d582036a0a02104a60.tar.gz
GFS2: Don't call file_accessed() with a shared glock
file_accessed() was being called by gfs2_mmap() with a shared glock. If it needed to update the atime, it was crashing because it dirtied the inode in gfs2_dirty_inode() without holding an exclusive lock. gfs2_dirty_inode() checked if the caller was already holding a glock, but it didn't make sure that the glock was in the exclusive state. Now, instead of calling file_accessed() while holding the shared lock in gfs2_mmap(), file_accessed() is called after grabbing and releasing the glock to update the inode. If file_accessed() needs to update the atime, it will grab an exclusive lock in gfs2_dirty_inode(). gfs2_dirty_inode() now also checks to make sure that if the calling process has already locked the glock, it has an exclusive lock. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/super.c')
-rw-r--r--fs/gfs2/super.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index bc737261f234..d6488674d916 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -810,7 +810,8 @@ static void gfs2_dirty_inode(struct inode *inode, int flags)
return;
}
need_unlock = 1;
- }
+ } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
+ return;
if (current->journal_info == NULL) {
ret = gfs2_trans_begin(sdp, RES_DINODE, 0);