cluster: RHEL4 - gfs: don't cancel glocks when writing to hidden file

[David Teigland <teigland@fedoraproject.org>]

Gitweb:        http://git.fedorahosted.org/git/cluster.git?p=cluster.git;a=commitdiff;h=5a6349be0bdba75d2b1cc90e5c5861d2661a6304
Commit:        5a6349be0bdba75d2b1cc90e5c5861d2661a6304
Parent:        ef0ddc8d5a80f38b92939a5f403ed444b10015d4
Author:        David Teigland <teigland@redhat.com>
AuthorDate:    Tue Feb 24 09:33:52 2009 -0600
Committer:     David Teigland <teigland@redhat.com>
CommitterDate: Tue Feb 24 09:33:52 2009 -0600

gfs: don't cancel glocks when writing to hidden file

bz 487026
bz 438268 (RHEL5 original)

When glock.c sees the PRIORITY flag, it cancels any outstanding
glocks prior to doing the lock request.  lock_dlm also uses the
PRIORITY flag to give give granting priority to the lock in the
dlm.  Both of these are necessary when the PRIORITY glock is used
for recovery, but only the second is wanted (neither is really
needed) when writing to a hidden file.  A new GL_NOCANCEL_OTHER
flag, combined with PRIORITY, is used to tell glock.c to not do
the cancels.

Signed-off-by: David Teigland <teigland@redhat.com>
---
 gfs-kernel/src/gfs/glock.c |    3 ++-
 gfs-kernel/src/gfs/glock.h |    1 +
 gfs-kernel/src/gfs/ioctl.c |    3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/gfs-kernel/src/gfs/glock.c b/gfs-kernel/src/gfs/glock.c
index 1014ea2..06cfaba 100644
--- a/gfs-kernel/src/gfs/glock.c
+++ b/gfs-kernel/src/gfs/glock.c
@@ -1326,7 +1326,8 @@ glock_wait_internal(struct gfs_holder *gh)
 		spin_unlock(&gl->gl_spin);
 	}
 
-	if (gh->gh_flags & LM_FLAG_PRIORITY)
+	if ((gh->gh_flags & LM_FLAG_PRIORITY) &&
+	    !(gh->gh_flags & GL_NOCANCEL_OTHER))
 		do_cancels(gh);
 
 	wait_for_completion(&gh->gh_wait);
diff --git a/gfs-kernel/src/gfs/glock.h b/gfs-kernel/src/gfs/glock.h
index e7b2325..4fa4d3f 100644
--- a/gfs-kernel/src/gfs/glock.h
+++ b/gfs-kernel/src/gfs/glock.h
@@ -33,6 +33,7 @@
 #define GL_NOCACHE        (0x00000400) /* Release glock when done, don't cache */
 #define GL_SYNC           (0x00000800) /* Sync to disk when no more holders */
 #define GL_NOCANCEL       (0x00001000) /* Don't ever cancel this request */
+#define GL_NOCANCEL_OTHER (0x00002000) /* Don't cancel other locks for this */
 
 #define GLR_TRYFAILED     (13)
 #define GLR_CANCELED      (14)
diff --git a/gfs-kernel/src/gfs/ioctl.c b/gfs-kernel/src/gfs/ioctl.c
index c5f0d2f..d73926a 100644
--- a/gfs-kernel/src/gfs/ioctl.c
+++ b/gfs-kernel/src/gfs/ioctl.c
@@ -1209,7 +1209,8 @@ gi_do_hfile_write(struct gfs_sbd *sdp, struct gfs_ioctl *gi)
 	gfs_write_calc_reserv(ip, gi->gi_size, &data_blocks, &ind_blocks);
 
 	error = gfs_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
-				  LM_FLAG_PRIORITY | GL_SYNC, &i_gh);
+				 LM_FLAG_PRIORITY | GL_SYNC | GL_NOCANCEL_OTHER,
+				 &i_gh);
 	if (error)
 		return error;