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Move the code from ufs_lookup.c used to do dotdot lookup, into

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the helper function. It is supposed to be useful for any filesystem
that has to unlock dvp to walk to the ".." entry in lookup routine.

Requested by:	jhb
Tested by:	pho
MFC after:	1 month
This commit is contained in:
Konstantin Belousov 2009-01-21 14:51:38 +00:00
parent fa3de7700c
commit e9aff35739
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=187528
3 changed files with 36 additions and 22 deletions
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32
sys/kern/vfs_vnops.c
View File

@ -1286,3 +1286,35 @@ vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
return (error);
}
int
vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags, struct vnode **rvp)
{
struct mount *mp;
int ltype, error;
mp = vp->v_mount;
ltype = VOP_ISLOCKED(vp);
KASSERT(ltype == LK_EXCLUSIVE || ltype == LK_SHARED,
("vn_vget_ino: vp not locked"));
for (;;) {
error = vfs_busy(mp, MBF_NOWAIT);
if (error == 0)
break;
VOP_UNLOCK(vp, 0);
pause("vn_vget", 1);
vn_lock(vp, ltype | LK_RETRY);
if (vp->v_iflag & VI_DOOMED)
return (ENOENT);
}
VOP_UNLOCK(vp, 0);
error = VFS_VGET(mp, ino, lkflags, rvp);
vfs_unbusy(mp);
vn_lock(vp, ltype | LK_RETRY);
if (vp->v_iflag & VI_DOOMED) {
if (error == 0)
vput(*rvp);
error = ENOENT;
}
return (error);
}

3
sys/sys/vnode.h
View File

@ -636,6 +636,9 @@ int vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
const char *attrname, int buflen, char *buf, struct thread *td);
int vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
const char *attrname, struct thread *td);
int vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags,
struct vnode **rvp);
int vfs_cache_lookup(struct vop_lookup_args *ap);
void vfs_timestamp(struct timespec *);
void vfs_write_resume(struct mount *mp);

23
sys/ufs/ufs/ufs_lookup.c
View File

@ -157,7 +157,6 @@ ufs_lookup(ap)
int nameiop = cnp->cn_nameiop;
ino_t ino;
int ltype;
struct mount *mp;
bp = NULL;
slotoffset = -1;
@ -578,27 +577,7 @@ ufs_lookup(ap)
*/
pdp = vdp;
if (flags & ISDOTDOT) {
ltype = VOP_ISLOCKED(pdp);
mp = pdp->v_mount;
for (;;) {
error = vfs_busy(mp, MBF_NOWAIT);
if (error == 0)
break;
VOP_UNLOCK(pdp, 0);
pause("ufs_dd", 1);
vn_lock(pdp, ltype | LK_RETRY);
if (pdp->v_iflag & VI_DOOMED)
return (ENOENT);
}
VOP_UNLOCK(pdp, 0); /* race to get the inode */
error = VFS_VGET(mp, ino, cnp->cn_lkflags, &tdp);
vfs_unbusy(mp);
vn_lock(pdp, ltype | LK_RETRY);
if (pdp->v_iflag & VI_DOOMED) {
if (error == 0)
vput(tdp);
error = ENOENT;
}
error = vn_vget_ino(pdp, ino, cnp->cn_lkflags, &tdp);
if (error)
return (error);
*vpp = tdp;