From ed17545d01e4a40086f1622c88ce64cc0241cfc2 Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Fri, 5 May 2017 09:43:02 -0500 Subject: [PATCH] GFS2: Allow glocks to be unlocked after withdraw This bug fixes a regression introduced by patch 0d1c7ae9d8. The intent of the patch was to stop promoting glocks after a file system is withdrawn due to a variety of errors, because doing so results in a BUG(). (You should be able to unmount after a withdraw rather than having the kernel panic.) Unfortunately, it also stopped demotions, so glocks could not be unlocked after withdraw, which means the unmount would hang. This patch allows function do_xmote to demote locks to an unlocked state after a withdraw, but not promote them. Signed-off-by: Bob Peterson --- fs/gfs2/glock.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 9e81219692c4..959a19ced4d5 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -449,7 +449,8 @@ __acquires(&gl->gl_lockref.lock) unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0); int ret; - if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) + if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && + target != LM_ST_UNLOCKED) return; lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | LM_FLAG_PRIORITY); @@ -486,7 +487,8 @@ __acquires(&gl->gl_lockref.lock) } else if (ret) { pr_err("lm_lock ret %d\n", ret); - GLOCK_BUG_ON(gl, 1); + GLOCK_BUG_ON(gl, !test_bit(SDF_SHUTDOWN, + &sdp->sd_flags)); } } else { /* lock_nolock */ finish_xmote(gl, target);