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- We no longer have to bother with PDIRUNLOCK, lookup() handles it for us.

Browse Source 
- Network filesystems are written with a special idiom that checks the
   cache first, and may even unlock dvp before discovering that a network
   round-trip is required to resolve the name.  I believe dvp is prevented
   from being recycled even in the forced unmount case by the shared lock
   on the mount point.  If not, this code should grow checks for VI_DOOMED
   after it relocks dvp or it will access NULL v_data fields.

Sponsored by:	Isilon Systems, Inc.
This commit is contained in:
Jeff Roberson 2005-03-28 09:29:58 +00:00
parent ee5a0a2d7c
commit f6576f194e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=144206
3 changed files with 41 additions and 146 deletions
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75
sys/fs/smbfs/smbfs_vnops.c
View File

@ -1050,10 +1050,6 @@ smbfs_pathcheck(struct smbmount *smp, const char *name, int nmlen, int nameiop)
return 0;
}
#ifndef PDIRUNLOCK
#define PDIRUNLOCK 0
#endif
/*
* Things go even weird without fixed inode numbers...
*/
@ -1080,11 +1076,10 @@ smbfs_lookup(ap)
int flags = cnp->cn_flags;
int nameiop = cnp->cn_nameiop;
int nmlen = cnp->cn_namelen;
int lockparent, wantparent, error, islastcn, isdot;
int wantparent, error, islastcn, isdot;
int killit;
SMBVDEBUG("\n");
cnp->cn_flags &= ~PDIRUNLOCK;
if (dvp->v_type != VDIR)
return ENOTDIR;
if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) {
@ -1108,7 +1103,6 @@ smbfs_lookup(ap)
return EROFS;
if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
return error;
lockparent = flags & LOCKPARENT;
wantparent = flags & (LOCKPARENT|WANTPARENT);
smp = VFSTOSMBFS(mp);
dnp = VTOSMB(dvp);
@ -1128,27 +1122,19 @@ smbfs_lookup(ap)
vhold(*vpp);
vp = *vpp;
mp_fixme("Unlocked v_id access.");
if (dvp == vp) { /* lookup on current */
vref(vp);
error = 0;
SMBVDEBUG("cached '.'\n");
} else if (flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, td); /* unlock parent */
cnp->cn_flags |= PDIRUNLOCK;
error = vget(vp, LK_EXCLUSIVE, td);
if (!error && lockparent && islastcn) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error == 0)
cnp->cn_flags &= ~PDIRUNLOCK;
}
} else {
if (error)
if (vn_lock(dvp, LK_EXCLUSIVE, td))
panic("smbfs_lookup: Can't "
"relock directory.");
} else
error = vget(vp, LK_EXCLUSIVE, td);
if (!lockparent || error || !islastcn) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
}
if (!error) {
killit = 0;
error = VOP_GETATTR(vp, &vattr, cnp->cn_cred, td);
@ -1174,20 +1160,25 @@ smbfs_lookup(ap)
return (0);
}
cache_purge(vp);
if (killit)
/*
* XXX This is not quite right, if '.' is
* inconsistent, we really need to start the lookup
* all over again. Hopefully there is some other
* guarantee that prevents this case from happening.
*/
if (killit && vp != dvp)
vgone(vp);
vput(vp);
if (lockparent && dvp != vp && islastcn)
VOP_UNLOCK(dvp, 0, td);
if (vp != dvp)
vput(vp);
else
vrele(vp);
if (flags & ISDOTDOT)
if (vn_lock(dvp, LK_EXCLUSIVE, td))
panic("smbfs_lookup: Can't "
"relock directory.");
}
vdrop(vp);
error = vn_lock(dvp, LK_EXCLUSIVE, td);
*vpp = NULLVP;
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
return (error);
}
cnp->cn_flags &= ~PDIRUNLOCK;
}
/*
* entry is not in the cache or has been expired
@ -1217,10 +1208,6 @@ smbfs_lookup(ap)
if (error)
return error;
cnp->cn_flags |= SAVENAME;
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
return (EJUSTRETURN);
}
return ENOENT;
@ -1244,10 +1231,6 @@ smbfs_lookup(ap)
return error;
*vpp = vp;
cnp->cn_flags |= SAVENAME;
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
return 0;
}
if (nameiop == RENAME && islastcn && wantparent) {
@ -1261,10 +1244,6 @@ smbfs_lookup(ap)
return error;
*vpp = vp;
cnp->cn_flags |= SAVENAME;
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
return 0;
}
if (flags & ISDOTDOT) {
@ -1274,14 +1253,6 @@ smbfs_lookup(ap)
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
return error;
}
if (lockparent && islastcn) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
vput(vp);
return error;
}
}
*vpp = vp;
} else if (isdot) {
vref(dvp);
@ -1292,10 +1263,6 @@ smbfs_lookup(ap)
return error;
*vpp = vp;
SMBVDEBUG("lookup: getnewvp!\n");
if (!lockparent || !islastcn) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
}
if ((cnp->cn_flags & MAKEENTRY)/* && !islastcn*/) {
/* VTOSMB(*vpp)->n_ctime = VTOSMB(*vpp)->n_vattr.va_ctime.tv_sec;*/

57
sys/nfs4client/nfs4_vnops.c
View File

@ -937,7 +937,7 @@ nfs4_lookup(struct vop_lookup_args *ap)
long len;
nfsfh_t *fhp;
struct nfsnode *np;
int lockparent, wantparent, error = 0, fhsize;
int wantparent, error = 0, fhsize;
struct thread *td = cnp->cn_thread;
struct nfs4_compound cp;
struct nfs4_oparg_getattr ga, dga;
@ -945,13 +945,11 @@ nfs4_lookup(struct vop_lookup_args *ap)
struct nfs4_oparg_getfh gfh;
*vpp = NULLVP;
cnp->cn_flags &= ~PDIRUNLOCK;
if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
if (dvp->v_type != VDIR)
return (ENOTDIR);
lockparent = flags & LOCKPARENT;
wantparent = flags & (LOCKPARENT|WANTPARENT);
nmp = VFSTONFS(dvp->v_mount);
np = VTONFS(dvp);
@ -977,20 +975,11 @@ nfs4_lookup(struct vop_lookup_args *ap)
error = 0;
} else if (flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
error = vget(newvp, LK_EXCLUSIVE, td);
if (!error && lockparent && (flags & ISLASTCN)) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error == 0)
cnp->cn_flags &= ~PDIRUNLOCK;
}
} else {
if (error)
vn_lock(dvp, LK_EXCLUSIVE|LK_RETRY, td);
} else
error = vget(newvp, LK_EXCLUSIVE, td);
if (!lockparent || error || !(flags & ISLASTCN)) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
}
if (!error) {
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td)
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
@ -1002,18 +991,15 @@ nfs4_lookup(struct vop_lookup_args *ap)
return (0);
}
cache_purge(newvp);
vput(newvp);
if (lockparent && dvp != newvp && (flags & ISLASTCN))
VOP_UNLOCK(dvp, 0, td);
if (newvp != dvp)
vput(newvp);
else
vrele(newvp);
if (flags & ISDOTDOT)
vn_lock(dvp, LK_EXCLUSIVE|LK_RETRY, td);
}
vdrop(newvp);
error = vn_lock(dvp, LK_EXCLUSIVE, td);
*vpp = NULLVP;
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
return (error);
}
cnp->cn_flags &= ~PDIRUNLOCK;
}
error = 0;
@ -1079,10 +1065,6 @@ nfs4_lookup(struct vop_lookup_args *ap)
*vpp = newvp;
cnp->cn_flags |= SAVENAME;
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
return (0);
}
@ -1097,16 +1079,6 @@ nfs4_lookup(struct vop_lookup_args *ap)
newvp = NFSTOV(np);
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
if (lockparent && (flags & ISLASTCN)) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
vput(newvp);
return (error);
}
} else
cnp->cn_flags |= PDIRUNLOCK;
} else if (NFS_CMPFH(np, fhp, fhsize)) {
VREF(dvp);
newvp = dvp;
@ -1114,11 +1086,6 @@ nfs4_lookup(struct vop_lookup_args *ap)
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error)
return (error);
if (!lockparent || !(flags & ISLASTCN)) {
cnp->cn_flags |= PDIRUNLOCK;
VOP_UNLOCK(dvp, 0, td);
}
newvp = NFSTOV(np);
/* Fill in np used by open. */
@ -1152,10 +1119,6 @@ nfs4_lookup(struct vop_lookup_args *ap)
}
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
(flags & ISLASTCN) && error == ENOENT) {
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
if (dvp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else

55
sys/nfsclient/nfs_vnops.c
View File

@ -776,18 +776,16 @@ nfs_lookup(struct vop_lookup_args *ap)
long len;
nfsfh_t *fhp;
struct nfsnode *np;
int lockparent, wantparent, error = 0, attrflag, fhsize;
int wantparent, error = 0, attrflag, fhsize;
int v3 = NFS_ISV3(dvp);
struct thread *td = cnp->cn_thread;
*vpp = NULLVP;
cnp->cn_flags &= ~PDIRUNLOCK;
if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
if (dvp->v_type != VDIR)
return (ENOTDIR);
lockparent = flags & LOCKPARENT;
wantparent = flags & (LOCKPARENT|WANTPARENT);
nmp = VFSTONFS(dvp->v_mount);
np = VTONFS(dvp);
@ -810,20 +808,11 @@ nfs_lookup(struct vop_lookup_args *ap)
error = 0;
} else if (flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
error = vget(newvp, LK_EXCLUSIVE, td);
if (!error && lockparent && (flags & ISLASTCN)) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error == 0)
cnp->cn_flags &= ~PDIRUNLOCK;
}
} else {
if (error)
vn_lock(dvp, LK_EXCLUSIVE|LK_RETRY, td);
} else
error = vget(newvp, LK_EXCLUSIVE, td);
if (!lockparent || error || !(flags & ISLASTCN)) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
}
if (!error) {
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td)
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
@ -835,18 +824,15 @@ nfs_lookup(struct vop_lookup_args *ap)
return (0);
}
cache_purge(newvp);
vput(newvp);
if (lockparent && dvp != newvp && (flags & ISLASTCN))
VOP_UNLOCK(dvp, 0, td);
if (dvp != newvp)
vput(newvp);
else
vrele(newvp);
if (flags & ISDOTDOT)
vn_lock(dvp, LK_EXCLUSIVE|LK_RETRY, td);
}
vdrop(newvp);
error = vn_lock(dvp, LK_EXCLUSIVE, td);
*vpp = NULLVP;
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
return (error);
}
cnp->cn_flags &= ~PDIRUNLOCK;
}
error = 0;
newvp = NULLVP;
@ -889,10 +875,6 @@ nfs_lookup(struct vop_lookup_args *ap)
*vpp = newvp;
m_freem(mrep);
cnp->cn_flags |= SAVENAME;
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
return (0);
}
@ -904,15 +886,6 @@ nfs_lookup(struct vop_lookup_args *ap)
return (error);
}
newvp = NFSTOV(np);
if (lockparent && (flags & ISLASTCN)) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
vput(newvp);
return (error);
}
} else
cnp->cn_flags |= PDIRUNLOCK;
} else if (NFS_CMPFH(np, fhp, fhsize)) {
VREF(dvp);
newvp = dvp;
@ -922,10 +895,6 @@ nfs_lookup(struct vop_lookup_args *ap)
m_freem(mrep);
return (error);
}
if (!lockparent || !(flags & ISLASTCN)) {
cnp->cn_flags |= PDIRUNLOCK;
VOP_UNLOCK(dvp, 0, td);
}
newvp = NFSTOV(np);
}
if (v3) {
@ -950,10 +919,6 @@ nfs_lookup(struct vop_lookup_args *ap)
}
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
(flags & ISLASTCN) && error == ENOENT) {
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
if (dvp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else