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- Use standard locking functions in syncer's opv

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- vput instead of vrele syncer vnodes in vfs_mount
 - Add vop_lookup_{pre,post} to verify locking in VOP_LOOKUP
This commit is contained in:
Jeff Roberson 2002-07-09 19:54:20 +00:00
parent ad70122060
commit 25b286d6db
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=99690
2 changed files with 50 additions and 9 deletions
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6
sys/kern/vfs_mount.c
View file

@ -614,7 +614,7 @@ vfs_nmount(td, fsflags, fsoptions)
error = vfs_allocate_syncvnode(mp);
} else {
if (mp->mnt_syncer != NULL)
vrele(mp->mnt_syncer);
vput(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
vfs_unbusy(mp, td);
@ -957,7 +957,7 @@ vfs_mount(td, fstype, fspath, fsflags, fsdata)
error = vfs_allocate_syncvnode(mp);
} else {
if (mp->mnt_syncer != NULL)
vrele(mp->mnt_syncer);
vput(mp->mnt_syncer);
mp->mnt_syncer = NULL;
}
vfs_unbusy(mp, td);
@ -1157,7 +1157,7 @@ dounmount(mp, flags, td)
mp->mnt_flag &=~ MNT_ASYNC;
cache_purgevfs(mp); /* remove cache entries for this file sys */
if (mp->mnt_syncer != NULL)
vrele(mp->mnt_syncer);
vput(mp->mnt_syncer);
/* Move process cdir/rdir refs on fs root to underlying vnode. */
if (VFS_ROOT(mp, &fsrootvp) == 0) {
if (mp->mnt_vnodecovered != NULL)

53
sys/kern/vfs_subr.c
View file

@ -275,6 +275,50 @@ vop_strategy_pre(void *ap)
}
}
void
vop_lookup_pre(void *ap)
{
struct vop_lookup_args *a = ap;
struct vnode *dvp;
dvp = a->a_dvp;
ASSERT_VOP_LOCKED(dvp, "VOP_LOOKUP");
}
void
vop_lookup_post(void *ap, int rc)
{
struct vop_lookup_args *a = ap;
struct componentname *cnp;
struct vnode *dvp;
struct vnode *vp;
int flags;
dvp = a->a_dvp;
cnp = a->a_cnp;
vp = *(a->a_vpp);
flags = cnp->cn_flags;
/*
* If this is the last path component for this lookup and LOCPARENT
* is set, OR if there is an error the directory has to be locked.
*/
if ((flags & LOCKPARENT) && (flags & ISLASTCN))
ASSERT_VOP_LOCKED(dvp, "VOP_LOOKUP (LOCKPARENT)");
else if (rc != 0)
ASSERT_VOP_LOCKED(dvp, "VOP_LOOKUP (error)");
else if (dvp != vp)
ASSERT_VOP_UNLOCKED(dvp, "VOP_LOOKUP (dvp)");
if (flags & PDIRUNLOCK)
ASSERT_VOP_UNLOCKED(dvp, "VOP_LOOKUP (PDIRUNLOCK)");
if (rc == 0)
ASSERT_VOP_LOCKED(vp, "VOP_LOOKUP (vpp)");
}
#endif /* DEBUG_VFS_LOCKS */
void
@ -2758,10 +2802,7 @@ vn_pollgone(vp)
static int sync_fsync(struct vop_fsync_args *);
static int sync_inactive(struct vop_inactive_args *);
static int sync_reclaim(struct vop_reclaim_args *);
#define sync_lock ((int (*)(struct vop_lock_args *))vop_nolock)
#define sync_unlock ((int (*)(struct vop_unlock_args *))vop_nounlock)
static int sync_print(struct vop_print_args *);
#define sync_islocked ((int(*)(struct vop_islocked_args *))vop_noislocked)
static vop_t **sync_vnodeop_p;
static struct vnodeopv_entry_desc sync_vnodeop_entries[] = {
@ -2770,10 +2811,10 @@ static struct vnodeopv_entry_desc sync_vnodeop_entries[] = {
{ &vop_fsync_desc, (vop_t *) sync_fsync }, /* fsync */
{ &vop_inactive_desc, (vop_t *) sync_inactive }, /* inactive */
{ &vop_reclaim_desc, (vop_t *) sync_reclaim }, /* reclaim */
{ &vop_lock_desc, (vop_t *) sync_lock }, /* lock */
{ &vop_unlock_desc, (vop_t *) sync_unlock }, /* unlock */
{ &vop_lock_desc, (vop_t *) vop_stdlock }, /* lock */
{ &vop_unlock_desc, (vop_t *) vop_stdunlock }, /* unlock */
{ &vop_print_desc, (vop_t *) sync_print }, /* print */
{ &vop_islocked_desc, (vop_t *) sync_islocked }, /* islocked */
{ &vop_islocked_desc, (vop_t *) vop_stdislocked }, /* islocked */
{ NULL, NULL }
};
static struct vnodeopv_desc sync_vnodeop_opv_desc =