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authorBenjamin Marzinski <bmarzins@redhat.com>2009-03-06 10:03:20 -0600
committerSteven Whitehouse <steve@dolmen.chygwyn.com>2009-03-24 11:21:26 +0000
commit02ffad08e838997fad3de05c85560a57e5fd92de (patch)
treefeee17b1848957b1b42047ae6c4156d716adf4e8 /fs/gfs2/incore.h
parent229615def3f573fc448d20f62c6ec1bc9340cefb (diff)
downloadop-kernel-dev-02ffad08e838997fad3de05c85560a57e5fd92de.zip
op-kernel-dev-02ffad08e838997fad3de05c85560a57e5fd92de.tar.gz
GFS2: Fix locking bug in failed shared to exclusive conversion
After calling out to the dlm, GFS2 sets the new state of a glock to gl_target in gdlm_ast(). However, gl_target is not always the lock state that was requested. If a conversion from shared to exclusive fails, finish_xmote() will call do_xmote() with LM_ST_UNLOCKED, instead of gl->gl_target, so that it can reacquire the lock in exlusive the next time around. In this case, setting the lock to gl_target in gdlm_ast() will make GFS2 think that it has the glock in exclusive mode, when really, it doesn't have the glock locked at all. This patch adds a new field to the gfs2_glock structure, gl_req, to track the mode that was requested. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 980a086..399d1b9 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -203,6 +203,7 @@ struct gfs2_glock {
unsigned int gl_target;
unsigned int gl_reply;
unsigned int gl_hash;
+ unsigned int gl_req;
unsigned int gl_demote_state; /* state requested by remote node */
unsigned long gl_demote_time; /* time of first demote request */
struct list_head gl_holders;
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