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When blocking on an F_FLOCK style lock request which is upgrading a

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shared lock to exclusive, drop the shared lock before deadlock
detection.

MFC after: 2 days
This commit is contained in:
Doug Rabson 2008-05-09 10:34:23 +00:00
parent b109dd74fe
commit 06c85cef9d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=178873
1 changed files with 12 additions and 11 deletions
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23
sys/kern/kern_lockf.c
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@ -1369,6 +1369,18 @@ lf_setlock(struct lockf *state, struct lockf_entry *lock, struct vnode *vp,
goto out;
}
/*
* For flock type locks, we must first remove
* any shared locks that we hold before we sleep
* waiting for an exclusive lock.
*/
if ((lock->lf_flags & F_FLOCK) &&
lock->lf_type == F_WRLCK) {
lock->lf_type = F_UNLCK;
lf_activate_lock(state, lock);
lock->lf_type = F_WRLCK;
}
/*
* We are blocked. Create edges to each blocking lock,
* checking for deadlock using the owner graph. For
@ -1388,17 +1400,6 @@ lf_setlock(struct lockf *state, struct lockf_entry *lock, struct vnode *vp,
goto out;
}
/*
* For flock type locks, we must first remove
* any shared locks that we hold before we sleep
* waiting for an exclusive lock.
*/
if ((lock->lf_flags & F_FLOCK) &&
lock->lf_type == F_WRLCK) {
lock->lf_type = F_UNLCK;
lf_activate_lock(state, lock);
lock->lf_type = F_WRLCK;
}
/*
* We have added edges to everything that blocks
* us. Sleep until they all go away.