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| author | Steven Whitehouse <swhiteho@redhat.com> | 2006-08-04 15:41:22 -0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2006-08-04 15:41:22 -0400 |
| commit | 59a1cc6bdabf5ed148b48808ad1a418d87f5e6bf (patch) | |
| tree | 6463071a09201040267702e895d63359e62c393d /fs/gfs2/recovery.c | |
| parent | 899bb264507cfed83922bf14cd66a073494601ba (diff) | |
| download | op-kernel-dev-59a1cc6bdabf5ed148b48808ad1a418d87f5e6bf.zip op-kernel-dev-59a1cc6bdabf5ed148b48808ad1a418d87f5e6bf.tar.gz | |
[GFS2] Fix lock ordering bug in page fault path
Mmapped files were able to trigger a lock ordering bug. Private
maps do not need to take the glock so early on. Shared maps do
unfortunately, however we can get around that by adding a flag
into the flags for the struct gfs2_file. This only works because
we are taking an exclusive lock at this point, so we know that
nobody else can be racing with us.
Fixes Red Hat bugzilla: #201196
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/recovery.c')
| -rw-r--r-- | fs/gfs2/recovery.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c index 7aabc03..bbd44a4 100644 --- a/fs/gfs2/recovery.c +++ b/fs/gfs2/recovery.c @@ -153,8 +153,7 @@ static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk, if (lh.lh_header.mh_magic != GFS2_MAGIC || lh.lh_header.mh_type != GFS2_METATYPE_LH || - lh.lh_blkno != blk || - lh.lh_hash != hash) + lh.lh_blkno != blk || lh.lh_hash != hash) return 1; *head = lh; @@ -482,11 +481,9 @@ int gfs2_recover_journal(struct gfs2_jdesc *jd) /* Acquire a shared hold on the transaction lock */ - error = gfs2_glock_nq_init(sdp->sd_trans_gl, - LM_ST_SHARED, + error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, LM_FLAG_NOEXP | LM_FLAG_PRIORITY | - GL_NOCANCEL | GL_NOCACHE, - &t_gh); + GL_NOCANCEL | GL_NOCACHE, &t_gh); if (error) goto fail_gunlock_ji; |
