int
vfs_optionisset(const vfs_t *vfsp, const char *opt, char **argp)
{
struct vfsoptlist *opts = vfsp->mnt_optnew;
int error;
if (opts == NULL)
return (0);
error = vfs_getopt(opts, opt, (void **)argp, NULL);
return (error != 0 ? 0 : 1);
}
static int
udf_mount(struct mount *mp, struct nameidata *ndp, struct thread *td)
{
struct vnode *devvp; /* vnode of the mount device */
struct udf_mnt *imp = 0;
struct export_args *export;
struct vfsoptlist *opts;
char *fspec;
size_t size;
int error, len;
opts = mp->mnt_optnew;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EROFS);
/*
* No root filesystem support. Probably not a big deal, since the
* bootloader doesn't understand UDF.
*/
if (mp->mnt_flag & MNT_ROOTFS)
return (ENOTSUP);
fspec = NULL;
error = vfs_getopt(opts, "from", (void **)&fspec, &len);
if (!error && fspec[len - 1] != '\0')
return (EINVAL);
if (mp->mnt_flag & MNT_UPDATE) {
imp = VFSTOUDFFS(mp);
if (fspec == NULL) {
error = vfs_getopt(opts, "export", (void **)&export,
&len);
if (error || len != sizeof(struct export_args))
return (EINVAL);
return (vfs_export(mp, export));
}
/*
* mp - path - addr in user space of mount point (ie /usr or whatever)
* data - addr in user space of mount params including the name of the block
* special file to treat as a filesystem.
*/
static int
msdosfs_mount(struct mount *mp)
{
struct vnode *devvp; /* vnode for blk device to mount */
struct thread *td;
/* msdosfs specific mount control block */
struct msdosfsmount *pmp = NULL;
struct nameidata ndp;
int error, flags;
accmode_t accmode;
char *from;
td = curthread;
if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts))
return (EINVAL);
/*
* If updating, check whether changing from read-only to
* read/write; if there is no device name, that's all we do.
*/
if (mp->mnt_flag & MNT_UPDATE) {
pmp = VFSTOMSDOSFS(mp);
if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) {
/*
* Forbid export requests if filesystem has
* MSDOSFS_LARGEFS flag set.
*/
if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) {
vfs_mount_error(mp,
"MSDOSFS_LARGEFS flag set, cannot export");
return (EOPNOTSUPP);
}
}
if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) &&
vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
error = VFS_SYNC(mp, MNT_WAIT);
if (error)
return (error);
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
error = vflush(mp, 0, flags, td);
if (error)
return (error);
/*
* Now the volume is clean. Mark it so while the
* device is still rw.
*/
error = markvoldirty(pmp, 0);
if (error) {
(void)markvoldirty(pmp, 1);
return (error);
}
/* Downgrade the device from rw to ro. */
DROP_GIANT();
g_topology_lock();
error = g_access(pmp->pm_cp, 0, -1, 0);
g_topology_unlock();
PICKUP_GIANT();
if (error) {
(void)markvoldirty(pmp, 1);
return (error);
}
/*
* Backing out after an error was painful in the
* above. Now we are committed to succeeding.
*/
pmp->pm_fmod = 0;
pmp->pm_flags |= MSDOSFSMNT_RONLY;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_RDONLY;
MNT_IUNLOCK(mp);
} else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) &&
!vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
/*
* If upgrade to read-write by non-root, then verify
* that user has necessary permissions on the device.
*/
devvp = pmp->pm_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(devvp, VREAD | VWRITE,
td->td_ucred, td);
if (error)
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
VOP_UNLOCK(devvp, 0);
return (error);
}
VOP_UNLOCK(devvp, 0);
DROP_GIANT();
g_topology_lock();
error = g_access(pmp->pm_cp, 0, 1, 0);
g_topology_unlock();
PICKUP_GIANT();
if (error)
return (error);
pmp->pm_fmod = 1;
pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_RDONLY;
MNT_IUNLOCK(mp);
/* Now that the volume is modifiable, mark it dirty. */
error = markvoldirty(pmp, 1);
if (error)
return (error);
}
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible disk device.
*/
if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL))
return (EINVAL);
NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td);
error = namei(&ndp);
if (error)
return (error);
devvp = ndp.ni_vp;
NDFREE(&ndp, NDF_ONLY_PNBUF);
if (!vn_isdisk(devvp, &error)) {
vput(devvp);
return (error);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
accmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accmode |= VWRITE;
error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
if (error)
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
vput(devvp);
return (error);
}
if ((mp->mnt_flag & MNT_UPDATE) == 0) {
error = mountmsdosfs(devvp, mp);
#ifdef MSDOSFS_DEBUG /* only needed for the printf below */
pmp = VFSTOMSDOSFS(mp);
#endif
} else {
vput(devvp);
if (devvp != pmp->pm_devvp)
return (EINVAL); /* XXX needs translation */
}
if (error) {
vrele(devvp);
return (error);
}
error = update_mp(mp, td);
if (error) {
if ((mp->mnt_flag & MNT_UPDATE) == 0)
msdosfs_unmount(mp, MNT_FORCE);
return error;
}
if (devvp->v_type == VCHR && devvp->v_rdev != NULL)
devvp->v_rdev->si_mountpt = mp;
vfs_mountedfrom(mp, from);
#ifdef MSDOSFS_DEBUG
printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
#endif
return (0);
}
static int
update_mp(struct mount *mp, struct thread *td)
{
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
void *dos, *win, *local;
int error, v;
if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) {
if (msdosfs_iconv != NULL) {
error = vfs_getopt(mp->mnt_optnew,
"cs_win", &win, NULL);
if (!error)
error = vfs_getopt(mp->mnt_optnew,
"cs_local", &local, NULL);
if (!error)
error = vfs_getopt(mp->mnt_optnew,
"cs_dos", &dos, NULL);
if (!error) {
msdosfs_iconv->open(win, local, &pmp->pm_u2w);
msdosfs_iconv->open(local, win, &pmp->pm_w2u);
msdosfs_iconv->open(dos, local, &pmp->pm_u2d);
msdosfs_iconv->open(local, dos, &pmp->pm_d2u);
}
if (error != 0)
return (error);
} else {
pmp->pm_w2u = NULL;
pmp->pm_u2w = NULL;
pmp->pm_d2u = NULL;
pmp->pm_u2d = NULL;
}
}
if (vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v) == 1)
pmp->pm_gid = v;
if (vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v) == 1)
pmp->pm_uid = v;
if (vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v) == 1)
pmp->pm_mask = v & ALLPERMS;
if (vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v) == 1)
pmp->pm_dirmask = v & ALLPERMS;
vfs_flagopt(mp->mnt_optnew, "shortname",
&pmp->pm_flags, MSDOSFSMNT_SHORTNAME);
vfs_flagopt(mp->mnt_optnew, "shortnames",
&pmp->pm_flags, MSDOSFSMNT_SHORTNAME);
vfs_flagopt(mp->mnt_optnew, "longname",
&pmp->pm_flags, MSDOSFSMNT_LONGNAME);
vfs_flagopt(mp->mnt_optnew, "longnames",
&pmp->pm_flags, MSDOSFSMNT_LONGNAME);
vfs_flagopt(mp->mnt_optnew, "kiconv",
&pmp->pm_flags, MSDOSFSMNT_KICONV);
if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0)
pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
else
pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95;
if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
else if (!(pmp->pm_flags &
(MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
struct vnode *rootvp;
/*
* Try to divine whether to support Win'95 long filenames
*/
if (FAT32(pmp))
pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
else {
if ((error =
msdosfs_root(mp, LK_EXCLUSIVE, &rootvp)) != 0)
return error;
pmp->pm_flags |= findwin95(VTODE(rootvp)) ?
MSDOSFSMNT_LONGNAME : MSDOSFSMNT_SHORTNAME;
vput(rootvp);
}
}
return 0;
}
/*
* VFS Operations.
*
* mount system call
*/
static int
ext2_mount(struct mount *mp)
{
struct vfsoptlist *opts;
struct vnode *devvp;
struct thread *td;
struct ext2mount *ump = NULL;
struct m_ext2fs *fs;
struct nameidata nd, *ndp = &nd;
accmode_t accmode;
char *path, *fspec;
int error, flags, len;
td = curthread;
opts = mp->mnt_optnew;
if (vfs_filteropt(opts, ext2_opts))
return (EINVAL);
vfs_getopt(opts, "fspath", (void **)&path, NULL);
/* Double-check the length of path.. */
if (strlen(path) >= MAXMNTLEN - 1)
return (ENAMETOOLONG);
fspec = NULL;
error = vfs_getopt(opts, "from", (void **)&fspec, &len);
if (!error && fspec[len - 1] != '\0')
return (EINVAL);
/*
* If updating, check whether changing from read-only to
* read/write; if there is no device name, that's all we do.
*/
if (mp->mnt_flag & MNT_UPDATE) {
ump = VFSTOEXT2(mp);
fs = ump->um_e2fs;
error = 0;
if (fs->e2fs_ronly == 0 &&
vfs_flagopt(opts, "ro", NULL, 0)) {
error = VFS_SYNC(mp, MNT_WAIT);
if (error)
return (error);
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
error = ext2_flushfiles(mp, flags, td);
if ( error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) {
fs->e2fs->e2fs_state |= E2FS_ISCLEAN;
ext2_sbupdate(ump, MNT_WAIT);
}
fs->e2fs_ronly = 1;
vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
DROP_GIANT();
g_topology_lock();
g_access(ump->um_cp, 0, -1, 0);
g_topology_unlock();
PICKUP_GIANT();
}
if (!error && (mp->mnt_flag & MNT_RELOAD))
error = ext2_reload(mp, td);
if (error)
return (error);
devvp = ump->um_devvp;
if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
return (EPERM);
/*
* If upgrade to read-write by non-root, then verify
* that user has necessary permissions on the device.
*/
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(devvp, VREAD | VWRITE,
td->td_ucred, td);
if (error)
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
VOP_UNLOCK(devvp, 0);
return (error);
}
VOP_UNLOCK(devvp, 0);
DROP_GIANT();
g_topology_lock();
error = g_access(ump->um_cp, 0, 1, 0);
g_topology_unlock();
PICKUP_GIANT();
if (error)
return (error);
if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 ||
(fs->e2fs->e2fs_state & E2FS_ERRORS)) {
if (mp->mnt_flag & MNT_FORCE) {
printf(
"WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
} else {
printf(
"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
fs->e2fs_fsmnt);
return (EPERM);
}
}
fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;
(void)ext2_cgupdate(ump, MNT_WAIT);
fs->e2fs_ronly = 0;
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_RDONLY;
MNT_IUNLOCK(mp);
}
if (vfs_flagopt(opts, "export", NULL, 0)) {
/* Process export requests in vfs_mount.c. */
return (error);
}
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible disk device.
*/
if (fspec == NULL)
return (EINVAL);
NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
if ((error = namei(ndp)) != 0)
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
devvp = ndp->ni_vp;
if (!vn_isdisk(devvp, &error)) {
vput(devvp);
return (error);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*
* XXXRW: VOP_ACCESS() enough?
*/
accmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accmode |= VWRITE;
error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
if (error)
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
vput(devvp);
return (error);
}
if ((mp->mnt_flag & MNT_UPDATE) == 0) {
error = ext2_mountfs(devvp, mp);
} else {
if (devvp != ump->um_devvp) {
vput(devvp);
return (EINVAL); /* needs translation */
} else
vput(devvp);
}
if (error) {
vrele(devvp);
return (error);
}
ump = VFSTOEXT2(mp);
fs = ump->um_e2fs;
/*
* Note that this strncpy() is ok because of a check at the start
* of ext2_mount().
*/
strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
vfs_mountedfrom(mp, fspec);
return (0);
}
/*
* Mount system call
*/
static int
reiserfs_mount(struct mount *mp)
{
size_t size;
int error, len;
accmode_t accmode;
char *path, *fspec;
struct vnode *devvp;
struct vfsoptlist *opts;
struct reiserfs_mount *rmp;
struct reiserfs_sb_info *sbi;
struct nameidata nd, *ndp = &nd;
struct thread *td;
td = curthread;
if (!(mp->mnt_flag & MNT_RDONLY))
return EROFS;
/* Get the new options passed to mount */
opts = mp->mnt_optnew;
/* `fspath' contains the mount point (eg. /mnt/linux); REQUIRED */
vfs_getopt(opts, "fspath", (void **)&path, NULL);
reiserfs_log(LOG_INFO, "mount point is `%s'\n", path);
/* `from' contains the device name (eg. /dev/ad0s1); REQUIRED */
fspec = NULL;
error = vfs_getopt(opts, "from", (void **)&fspec, &len);
if (!error && fspec[len - 1] != '\0')
return (EINVAL);
reiserfs_log(LOG_INFO, "device is `%s'\n", fspec);
/* Handle MNT_UPDATE (mp->mnt_flag) */
if (mp->mnt_flag & MNT_UPDATE) {
/* For now, only NFS export is supported. */
if (vfs_flagopt(opts, "export", NULL, 0))
return (0);
}
/* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible disk device. */
if (fspec == NULL)
return (EINVAL);
NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
if ((error = namei(ndp)) != 0)
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
devvp = ndp->ni_vp;
if (!vn_isdisk(devvp, &error)) {
vput(devvp);
return (error);
}
/* If mount by non-root, then verify that user has necessary
* permissions on the device. */
accmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accmode |= VWRITE;
error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
if (error)
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
vput(devvp);
return (error);
}
if ((mp->mnt_flag & MNT_UPDATE) == 0) {
error = reiserfs_mountfs(devvp, mp, td);
} else {
/* TODO Handle MNT_UPDATE */
vput(devvp);
return (EOPNOTSUPP);
}
if (error) {
vrele(devvp);
return (error);
}
rmp = VFSTOREISERFS(mp);
sbi = rmp->rm_reiserfs;
/*
* Note that this strncpy() is ok because of a check at the start
* of reiserfs_mount().
*/
reiserfs_log(LOG_DEBUG, "prepare statfs data\n");
(void)copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void)reiserfs_statfs(mp, &mp->mnt_stat);
reiserfs_log(LOG_DEBUG, "done\n");
return (0);
}
static int vboxvfs_mount(struct mount *mp, struct thread *td)
{
int rc;
char *pszShare;
int cbShare, cbOption;
int uid = 0, gid = 0;
struct sf_glob_info *pShFlGlobalInfo;
SHFLSTRING *pShFlShareName = NULL;
int cbShFlShareName;
printf("%s: Enter\n", __FUNCTION__);
if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
return EOPNOTSUPP;
if (vfs_filteropt(mp->mnt_optnew, vboxvfs_opts))
{
vfs_mount_error(mp, "%s", "Invalid option");
return EINVAL;
}
rc = vfs_getopt(mp->mnt_optnew, "from", (void **)&pszShare, &cbShare);
if (rc || pszShare[cbShare-1] != '\0' || cbShare > 0xfffe)
return EINVAL;
rc = vfs_getopt(mp->mnt_optnew, "gid", (void **)&gid, &cbOption);
if ((rc != ENOENT) && (rc || cbOption != sizeof(gid)))
return EINVAL;
rc = vfs_getopt(mp->mnt_optnew, "uid", (void **)&uid, &cbOption);
if ((rc != ENOENT) && (rc || cbOption != sizeof(uid)))
return EINVAL;
pShFlGlobalInfo = RTMemAllocZ(sizeof(struct sf_glob_info));
if (!pShFlGlobalInfo)
return ENOMEM;
cbShFlShareName = offsetof (SHFLSTRING, String.utf8) + cbShare + 1;
pShFlShareName = RTMemAllocZ(cbShFlShareName);
if (!pShFlShareName)
return VERR_NO_MEMORY;
pShFlShareName->u16Length = cbShare;
pShFlShareName->u16Size = cbShare + 1;
memcpy (pShFlShareName->String.utf8, pszShare, cbShare + 1);
rc = VbglR0SfMapFolder (&g_vboxSFClient, pShFlShareName, &pShFlGlobalInfo->map);
RTMemFree(pShFlShareName);
if (RT_FAILURE (rc))
{
RTMemFree(pShFlGlobalInfo);
printf("VbglR0SfMapFolder failed rc=%d\n", rc);
return EPROTO;
}
pShFlGlobalInfo->uid = uid;
pShFlGlobalInfo->gid = gid;
mp->mnt_data = pShFlGlobalInfo;
/** @todo root vnode. */
vfs_getnewfsid(mp);
vfs_mountedfrom(mp, pszShare);
printf("%s: Leave rc=0\n", __FUNCTION__);
return 0;
}
static void
nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp,
const char *hostname)
{
int s;
int adjsock;
int maxio;
char *p;
char *secname;
char *principal;
s = splnet();
/*
* Set read-only flag if requested; otherwise, clear it if this is
* an update. If this is not an update, then either the read-only
* flag is already clear, or this is a root mount and it was set
* intentionally at some previous point.
*/
if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0) {
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_RDONLY;
MNT_IUNLOCK(mp);
} else if (mp->mnt_flag & MNT_UPDATE) {
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_RDONLY;
MNT_IUNLOCK(mp);
}
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context. Also, set up appropriate retransmit
* and soft timeout behavior.
*/
if (argp->sotype == SOCK_STREAM) {
nmp->nm_flag &= ~NFSMNT_NOCONN;
nmp->nm_flag |= NFSMNT_DUMBTIMR;
nmp->nm_timeo = NFS_MAXTIMEO;
nmp->nm_retry = NFS_RETRANS_TCP;
}
/* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
if ((argp->flags & NFSMNT_NFSV3) == 0)
nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
/* Also re-bind if we're switching to/from a connected UDP socket */
adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
(argp->flags & NFSMNT_NOCONN));
/* Update flags atomically. Don't change the lock bits. */
nmp->nm_flag = argp->flags | nmp->nm_flag;
splx(s);
if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
if (nmp->nm_timeo < NFS_MINTIMEO)
nmp->nm_timeo = NFS_MINTIMEO;
else if (nmp->nm_timeo > NFS_MAXTIMEO)
nmp->nm_timeo = NFS_MAXTIMEO;
}
if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
nmp->nm_retry = argp->retrans;
if (nmp->nm_retry > NFS_MAXREXMIT)
nmp->nm_retry = NFS_MAXREXMIT;
}
if (argp->flags & NFSMNT_NFSV3) {
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
} else
maxio = NFS_V2MAXDATA;
if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
nmp->nm_wsize = argp->wsize;
/* Round down to multiple of blocksize */
nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize <= 0)
nmp->nm_wsize = NFS_FABLKSIZE;
}
if (nmp->nm_wsize > maxio)
nmp->nm_wsize = maxio;
if (nmp->nm_wsize > MAXBSIZE)
nmp->nm_wsize = MAXBSIZE;
if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
nmp->nm_rsize = argp->rsize;
/* Round down to multiple of blocksize */
nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize <= 0)
nmp->nm_rsize = NFS_FABLKSIZE;
}
if (nmp->nm_rsize > maxio)
nmp->nm_rsize = maxio;
if (nmp->nm_rsize > MAXBSIZE)
nmp->nm_rsize = MAXBSIZE;
if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
nmp->nm_readdirsize = argp->readdirsize;
}
if (nmp->nm_readdirsize > maxio)
nmp->nm_readdirsize = maxio;
if (nmp->nm_readdirsize > nmp->nm_rsize)
nmp->nm_readdirsize = nmp->nm_rsize;
if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
nmp->nm_acregmin = argp->acregmin;
else
nmp->nm_acregmin = NFS_MINATTRTIMO;
if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
nmp->nm_acregmax = argp->acregmax;
else
nmp->nm_acregmax = NFS_MAXATTRTIMO;
if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
nmp->nm_acdirmin = argp->acdirmin;
else
nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
nmp->nm_acdirmax = argp->acdirmax;
else
nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
if (nmp->nm_acdirmin > nmp->nm_acdirmax)
nmp->nm_acdirmin = nmp->nm_acdirmax;
if (nmp->nm_acregmin > nmp->nm_acregmax)
nmp->nm_acregmin = nmp->nm_acregmax;
if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
if (argp->maxgrouplist <= NFS_MAXGRPS)
nmp->nm_numgrps = argp->maxgrouplist;
else
nmp->nm_numgrps = NFS_MAXGRPS;
}
if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
if (argp->readahead <= NFS_MAXRAHEAD)
nmp->nm_readahead = argp->readahead;
else
nmp->nm_readahead = NFS_MAXRAHEAD;
}
if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
if (argp->wcommitsize < nmp->nm_wsize)
nmp->nm_wcommitsize = nmp->nm_wsize;
else
nmp->nm_wcommitsize = argp->wcommitsize;
}
if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
if (argp->deadthresh <= NFS_MAXDEADTHRESH)
nmp->nm_deadthresh = argp->deadthresh;
else
nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
}
adjsock |= ((nmp->nm_sotype != argp->sotype) ||
(nmp->nm_soproto != argp->proto));
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
if (nmp->nm_client && adjsock) {
nfs_safedisconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp)) {
printf("nfs_args: retrying connect\n");
(void) tsleep(&fake_wchan, PSOCK, "nfscon", hz);
}
}
if (hostname) {
strlcpy(nmp->nm_hostname, hostname,
sizeof(nmp->nm_hostname));
p = strchr(nmp->nm_hostname, ':');
if (p)
*p = '\0';
}
if (vfs_getopt(mp->mnt_optnew, "sec",
(void **) &secname, NULL) == 0) {
nmp->nm_secflavor = nfs_sec_name_to_num(secname);
} else {
nmp->nm_secflavor = AUTH_SYS;
}
if (vfs_getopt(mp->mnt_optnew, "principal",
(void **) &principal, NULL) == 0) {
strlcpy(nmp->nm_principal, principal,
sizeof(nmp->nm_principal));
} else {
snprintf(nmp->nm_principal, sizeof(nmp->nm_principal),
"nfs@%s", nmp->nm_hostname);
}
}
/*
* Mount the per-process file descriptors (/dev/fd)
*/
static int
portal_mount(struct mount *mp)
{
struct file *fp;
struct portalmount *fmp;
struct socket *so;
struct vnode *rvp;
struct thread *td;
struct portalnode *pn;
int error, v;
char *p;
td = curthread;
if (vfs_filteropt(mp->mnt_optnew, portal_opts))
return (EINVAL);
error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v);
if (error != 1)
return (EINVAL);
error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL);
if (error)
return (error);
/*
* Capsicum is not incompatible with portalfs, but we don't really
* know what rights are required. In the spirit of "better safe than
* sorry", pretend that all rights are required for now.
*/
if ((error = fget(td, v, CAP_MASK_VALID, &fp)) != 0)
return (error);
if (fp->f_type != DTYPE_SOCKET) {
fdrop(fp, td);
return(ENOTSOCK);
}
so = fp->f_data; /* XXX race against userland */
if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
fdrop(fp, td);
return (ESOCKTNOSUPPORT);
}
pn = malloc(sizeof(struct portalnode),
M_TEMP, M_WAITOK);
fmp = malloc(sizeof(struct portalmount),
M_PORTALFSMNT, M_WAITOK); /* XXX */
error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */
if (error) {
free(fmp, M_PORTALFSMNT);
free(pn, M_TEMP);
fdrop(fp, td);
return (error);
}
error = insmntque(rvp, mp); /* XXX: Too early for mpsafe fs */
if (error != 0) {
free(fmp, M_PORTALFSMNT);
free(pn, M_TEMP);
fdrop(fp, td);
return (error);
}
rvp->v_data = pn;
rvp->v_type = VDIR;
rvp->v_vflag |= VV_ROOT;
VTOPORTAL(rvp)->pt_arg = 0;
VTOPORTAL(rvp)->pt_size = 0;
VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
fmp->pm_root = rvp;
fhold(fp);
fmp->pm_server = fp;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
MNT_IUNLOCK(mp);
mp->mnt_data = fmp;
vfs_getnewfsid(mp);
vfs_mountedfrom(mp, p);
fdrop(fp, td);
return (0);
}
VMBlockVFSMount(struct mount *mp, // IN: mount(2) parameters
struct thread *td) // IN: caller's thread context
#endif
{
struct VMBlockMount *xmp;
struct nameidata nd, *ndp = &nd;
struct vnode *lowerrootvp, *vp;
char *target;
char *pathname;
int len, error = 0;
VMBLOCKDEBUG("VMBlockVFSMount(mp = %p)\n", (void *)mp);
/*
* TODO: Strip out extraneous export & other misc cruft.
*/
/*
* Disallow the following:
* 1. Mounting over the system root.
* 2. Mount updates/remounts. (Reconsider for rw->ro, ro->rw?)
* 3. Mounting VMBlock on top of a VMBlock.
*/
if ((mp->mnt_flag & MNT_ROOTFS) ||
(mp->mnt_flag & MNT_UPDATE) ||
(mp->mnt_vnodecovered->v_op == &VMBlockVnodeOps)) {
return EOPNOTSUPP;
}
/*
* XXX Should only be unlocked if mnt_flag & MNT_UPDATE.
*/
ASSERT_VOP_UNLOCKED(mp->mnt_vnodecovered, "Covered vnode already locked!");
/*
* Look up path to lower layer (VMBlock source / DnD staging area).
* (E.g., in the command "mount /tmp/VMwareDnD /var/run/vmblock",
* /tmp/VMwareDnD is the staging area.)
*/
error = vfs_getopt(mp->mnt_optnew, "target", (void **)&target, &len);
if (error || target[len - 1] != '\0') {
return EINVAL;
}
pathname = uma_zalloc(VMBlockPathnameZone, M_WAITOK);
if (pathname == NULL) {
return ENOMEM;
}
if (strlcpy(pathname, target, MAXPATHLEN) >= MAXPATHLEN) {
uma_zfree(VMBlockPathnameZone, pathname);
return ENAMETOOLONG;
}
/*
* Find lower node and lock if not already locked.
*/
NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, UIO_SYSSPACE, target, compat_td);
error = namei(ndp);
if (error) {
NDFREE(ndp, 0);
uma_zfree(VMBlockPathnameZone, pathname);
return error;
}
NDFREE(ndp, NDF_ONLY_PNBUF);
/*
* Check multi VMBlock mount to avoid `lock against myself' panic.
*/
lowerrootvp = ndp->ni_vp;
if (lowerrootvp == VPTOVMB(mp->mnt_vnodecovered)->lowerVnode) {
VMBLOCKDEBUG("VMBlockVFSMount: multi vmblock mount?\n");
vput(lowerrootvp);
uma_zfree(VMBlockPathnameZone, pathname);
return EDEADLK;
}
xmp = malloc(sizeof *xmp, M_VMBLOCKFSMNT, M_WAITOK);
/*
* Record pointer (mountVFS) to the staging area's file system. Follow up
* by grabbing a VMBlockNode for our layer's root.
*/
xmp->mountVFS = lowerrootvp->v_mount;
error = VMBlockNodeGet(mp, lowerrootvp, &vp, pathname);
/*
* Make sure the node alias worked
*/
if (error) {
COMPAT_VOP_UNLOCK(vp, 0, compat_td);
vrele(lowerrootvp);
free(xmp, M_VMBLOCKFSMNT); /* XXX */
uma_zfree(VMBlockPathnameZone, pathname);
return error;
}
/*
* Record a reference to the new filesystem's root vnode & mark it as such.
*/
xmp->rootVnode = vp;
xmp->rootVnode->v_vflag |= VV_ROOT;
/*
* Unlock the node (either the lower or the alias)
*/
COMPAT_VOP_UNLOCK(vp, 0, compat_td);
/*
* If the staging area is a local filesystem, reflect that here, too. (We
* could potentially allow NFS staging areas.)
*/
MNT_ILOCK(mp);
mp->mnt_flag |= lowerrootvp->v_mount->mnt_flag & MNT_LOCAL;
#if __FreeBSD_version >= 600000 && __FreeBSD_version < 1000000
mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag & MNTK_MPSAFE;
#endif
MNT_IUNLOCK(mp);
mp->mnt_data = (qaddr_t) xmp;
vfs_getnewfsid(mp);
vfs_mountedfrom(mp, target);
VMBLOCKDEBUG("VMBlockVFSMount: lower %s, alias at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
return 0;
}
/*
* Mount unionfs layer.
*/
static int
unionfs_domount(struct mount *mp)
{
int error;
struct vnode *lowerrootvp;
struct vnode *upperrootvp;
struct unionfs_mount *ump;
struct thread *td;
char *target;
char *tmp;
char *ep;
int len;
size_t done;
int below;
uid_t uid;
gid_t gid;
u_short udir;
u_short ufile;
unionfs_copymode copymode;
unionfs_whitemode whitemode;
struct componentname fakecn;
struct nameidata nd, *ndp;
struct vattr va;
UNIONFSDEBUG("unionfs_mount(mp = %p)\n", (void *)mp);
error = 0;
below = 0;
uid = 0;
gid = 0;
udir = 0;
ufile = 0;
copymode = UNIONFS_TRANSPARENT; /* default */
whitemode = UNIONFS_WHITE_ALWAYS;
ndp = &nd;
td = curthread;
if (mp->mnt_flag & MNT_ROOTFS) {
vfs_mount_error(mp, "Cannot union mount root filesystem");
return (EOPNOTSUPP);
}
/*
* Update is a no operation.
*/
if (mp->mnt_flag & MNT_UPDATE) {
vfs_mount_error(mp, "unionfs does not support mount update");
return (EOPNOTSUPP);
}
/*
* Get argument
*/
error = vfs_getopt(mp->mnt_optnew, "target", (void **)&target, &len);
if (error)
error = vfs_getopt(mp->mnt_optnew, "from", (void **)&target,
&len);
if (error || target[len - 1] != '\0') {
vfs_mount_error(mp, "Invalid target");
return (EINVAL);
}
if (vfs_getopt(mp->mnt_optnew, "below", NULL, NULL) == 0)
below = 1;
if (vfs_getopt(mp->mnt_optnew, "udir", (void **)&tmp, NULL) == 0) {
if (tmp != NULL)
udir = (mode_t)strtol(tmp, &ep, 8);
if (tmp == NULL || *ep) {
vfs_mount_error(mp, "Invalid udir");
return (EINVAL);
}
udir &= S_IRWXU | S_IRWXG | S_IRWXO;
}
if (vfs_getopt(mp->mnt_optnew, "ufile", (void **)&tmp, NULL) == 0) {
if (tmp != NULL)
ufile = (mode_t)strtol(tmp, &ep, 8);
if (tmp == NULL || *ep) {
vfs_mount_error(mp, "Invalid ufile");
return (EINVAL);
}
ufile &= S_IRWXU | S_IRWXG | S_IRWXO;
}
/* check umask, uid and gid */
if (udir == 0 && ufile != 0)
udir = ufile;
if (ufile == 0 && udir != 0)
ufile = udir;
vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(mp->mnt_vnodecovered, &va, mp->mnt_cred);
if (!error) {
if (udir == 0)
udir = va.va_mode;
if (ufile == 0)
ufile = va.va_mode;
uid = va.va_uid;
gid = va.va_gid;
}
VOP_UNLOCK(mp->mnt_vnodecovered, 0);
if (error)
return (error);
if (mp->mnt_cred->cr_ruid == 0) { /* root only */
if (vfs_getopt(mp->mnt_optnew, "uid", (void **)&tmp,
NULL) == 0) {
if (tmp != NULL)
uid = (uid_t)strtol(tmp, &ep, 10);
if (tmp == NULL || *ep) {
vfs_mount_error(mp, "Invalid uid");
return (EINVAL);
}
}
if (vfs_getopt(mp->mnt_optnew, "gid", (void **)&tmp,
NULL) == 0) {
if (tmp != NULL)
gid = (gid_t)strtol(tmp, &ep, 10);
if (tmp == NULL || *ep) {
vfs_mount_error(mp, "Invalid gid");
return (EINVAL);
}
}
if (vfs_getopt(mp->mnt_optnew, "copymode", (void **)&tmp,
NULL) == 0) {
if (tmp == NULL) {
vfs_mount_error(mp, "Invalid copymode");
return (EINVAL);
} else if (strcasecmp(tmp, "traditional") == 0)
copymode = UNIONFS_TRADITIONAL;
else if (strcasecmp(tmp, "transparent") == 0)
copymode = UNIONFS_TRANSPARENT;
else if (strcasecmp(tmp, "masquerade") == 0)
copymode = UNIONFS_MASQUERADE;
else {
vfs_mount_error(mp, "Invalid copymode");
return (EINVAL);
}
}
if (vfs_getopt(mp->mnt_optnew, "whiteout", (void **)&tmp,
NULL) == 0) {
if (tmp == NULL) {
vfs_mount_error(mp, "Invalid whiteout mode");
return (EINVAL);
} else if (strcasecmp(tmp, "always") == 0)
whitemode = UNIONFS_WHITE_ALWAYS;
else if (strcasecmp(tmp, "whenneeded") == 0)
whitemode = UNIONFS_WHITE_WHENNEEDED;
else {
vfs_mount_error(mp, "Invalid whiteout mode");
return (EINVAL);
}
}
}
/* If copymode is UNIONFS_TRADITIONAL, uid/gid is mounted user. */
if (copymode == UNIONFS_TRADITIONAL) {
uid = mp->mnt_cred->cr_ruid;
gid = mp->mnt_cred->cr_rgid;
}
UNIONFSDEBUG("unionfs_mount: uid=%d, gid=%d\n", uid, gid);
UNIONFSDEBUG("unionfs_mount: udir=0%03o, ufile=0%03o\n", udir, ufile);
UNIONFSDEBUG("unionfs_mount: copymode=%d\n", copymode);
/*
* Find upper node
*/
NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, target, td);
if ((error = namei(ndp)))
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
/* get root vnodes */
lowerrootvp = mp->mnt_vnodecovered;
upperrootvp = ndp->ni_vp;
/* create unionfs_mount */
ump = (struct unionfs_mount *)malloc(sizeof(struct unionfs_mount),
M_UNIONFSMNT, M_WAITOK | M_ZERO);
/*
* Save reference
*/
if (below) {
VOP_UNLOCK(upperrootvp, 0);
vn_lock(lowerrootvp, LK_EXCLUSIVE | LK_RETRY);
ump->um_lowervp = upperrootvp;
ump->um_uppervp = lowerrootvp;
} else {
ump->um_lowervp = lowerrootvp;
ump->um_uppervp = upperrootvp;
}
ump->um_rootvp = NULLVP;
ump->um_uid = uid;
ump->um_gid = gid;
ump->um_udir = udir;
ump->um_ufile = ufile;
ump->um_copymode = copymode;
ump->um_whitemode = whitemode;
MNT_ILOCK(mp);
if ((lowerrootvp->v_mount->mnt_kern_flag & MNTK_MPSAFE) &&
(upperrootvp->v_mount->mnt_kern_flag & MNTK_MPSAFE))
mp->mnt_kern_flag |= MNTK_MPSAFE;
MNT_IUNLOCK(mp);
mp->mnt_data = ump;
/*
* Copy upper layer's RDONLY flag.
*/
mp->mnt_flag |= ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY;
/*
* Check whiteout
*/
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
memset(&fakecn, 0, sizeof(fakecn));
fakecn.cn_nameiop = LOOKUP;
fakecn.cn_thread = td;
error = VOP_WHITEOUT(ump->um_uppervp, &fakecn, LOOKUP);
if (error) {
if (below) {
VOP_UNLOCK(ump->um_uppervp, 0);
vrele(upperrootvp);
} else
vput(ump->um_uppervp);
free(ump, M_UNIONFSMNT);
mp->mnt_data = NULL;
return (error);
}
}
/*
* Unlock the node
*/
VOP_UNLOCK(ump->um_uppervp, 0);
/*
* Get the unionfs root vnode.
*/
error = unionfs_nodeget(mp, ump->um_uppervp, ump->um_lowervp,
NULLVP, &(ump->um_rootvp), NULL, td);
vrele(upperrootvp);
if (error) {
free(ump, M_UNIONFSMNT);
mp->mnt_data = NULL;
return (error);
}
/*
* Check mnt_flag
*/
if ((ump->um_lowervp->v_mount->mnt_flag & MNT_LOCAL) &&
(ump->um_uppervp->v_mount->mnt_flag & MNT_LOCAL))
mp->mnt_flag |= MNT_LOCAL;
/*
* Get new fsid
*/
vfs_getnewfsid(mp);
len = MNAMELEN - 1;
tmp = mp->mnt_stat.f_mntfromname;
copystr((below ? "<below>:" : "<above>:"), tmp, len, &done);
len -= done - 1;
tmp += done - 1;
copystr(target, tmp, len, NULL);
UNIONFSDEBUG("unionfs_mount: from %s, on %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
return (0);
}
static int
p9fs_mount_parse_opts(struct mount *mp)
{
struct p9fsmount *p9mp = VFSTOP9(mp);
struct p9fs_session *p9s = &p9mp->p9_session;
struct sockaddr *saddr = NULL;
char *opt;
int error = EINVAL;
int fromnamelen, ret;
if (vfs_getopt(mp->mnt_optnew, "debug", (void **)&opt, NULL) == 0) {
if (opt == NULL) {
vfs_mount_error(mp, "must specify value for debug");
goto out;
}
ret = sscanf(opt, "%d", &p9mp->p9_debuglevel);
if (ret != 1 || p9mp->p9_debuglevel < 0) {
vfs_mount_error(mp, "illegal debug value: %s", opt);
goto out;
}
}
/* Flags beyond here are not supported for updates. */
if (mp->mnt_flag & MNT_UPDATE)
return (0);
ret = vfs_getopt(mp->mnt_optnew, "addr", (void **)&saddr,
&p9s->p9s_sockaddr_len);
if (ret != 0 || saddr == NULL) {
vfs_mount_error(mp, "No server address");
goto out;
}
if (p9s->p9s_sockaddr_len > SOCK_MAXADDRLEN) {
error = ENAMETOOLONG;
goto out;
}
bcopy(saddr, &p9s->p9s_sockaddr, p9s->p9s_sockaddr_len);
ret = vfs_getopt(mp->mnt_optnew, "hostname", (void **)&opt, NULL);
if (ret != 0) {
vfs_mount_error(mp, "No remote host");
goto out;
}
ret = strlcpy(p9mp->p9_hostname, opt, sizeof (p9mp->p9_hostname));
if (ret >= sizeof (p9mp->p9_hostname)) {
error = ENAMETOOLONG;
goto out;
}
ret = vfs_getopt(mp->mnt_optnew, "path", (void **)&opt, NULL);
if (ret != 0) {
vfs_mount_error(mp, "No remote path");
goto out;
}
ret = strlcpy(p9s->p9s_path, opt, sizeof (p9s->p9s_path));
if (ret >= sizeof (p9s->p9s_path)) {
error = ENAMETOOLONG;
goto out;
}
fromnamelen = sizeof (mp->mnt_stat.f_mntfromname);
ret = snprintf(mp->mnt_stat.f_mntfromname, fromnamelen,
"%s:%s", p9mp->p9_hostname, p9s->p9s_path);
if (ret >= fromnamelen) {
error = ENAMETOOLONG;
goto out;
}
if (vfs_getopt(mp->mnt_optnew, "proto", (void **)&opt, NULL) == 0) {
if (strcasecmp(opt, "tcp") == 0) {
p9s->p9s_socktype = SOCK_STREAM;
p9s->p9s_proto = IPPROTO_TCP;
} else if (strcasecmp(opt, "udp") == 0) {
p9s->p9s_socktype = SOCK_DGRAM;
p9s->p9s_proto = IPPROTO_UDP;
} else {
vfs_mount_error(mp, "illegal proto: %s", opt);
goto out;
}
}
error = 0;
out:
return (error);
}
/*ARGSUSED*/
static int
zfs_mount(vfs_t *vfsp)
{
kthread_t *td = curthread;
vnode_t *mvp = vfsp->mnt_vnodecovered;
cred_t *cr = td->td_ucred;
char *osname;
int error = 0;
int canwrite;
if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
return (EINVAL);
/*
* If full-owner-access is enabled and delegated administration is
* turned on, we must set nosuid.
*/
if (zfs_super_owner &&
dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) {
secpolicy_fs_mount_clearopts(cr, vfsp);
}
/*
* Check for mount privilege?
*
* If we don't have privilege then see if
* we have local permission to allow it
*/
error = secpolicy_fs_mount(cr, mvp, vfsp);
if (error) {
error = dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr);
if (error != 0)
goto out;
if (!(vfsp->vfs_flag & MS_REMOUNT)) {
vattr_t vattr;
/*
* Make sure user is the owner of the mount point
* or has sufficient privileges.
*/
vattr.va_mask = AT_UID;
vn_lock(mvp, LK_SHARED | LK_RETRY);
if (error = VOP_GETATTR(mvp, &vattr, cr)) {
VOP_UNLOCK(mvp, 0);
goto out;
}
#if 0 /* CHECK THIS! Is probably needed for zfs_suser. */
if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
VOP_ACCESS(mvp, VWRITE, cr, td) != 0) {
error = EPERM;
goto out;
}
#else
if (error = secpolicy_vnode_owner(mvp, cr, vattr.va_uid)) {
VOP_UNLOCK(mvp, 0);
goto out;
}
if (error = VOP_ACCESS(mvp, VWRITE, cr, td)) {
VOP_UNLOCK(mvp, 0);
goto out;
}
VOP_UNLOCK(mvp, 0);
#endif
}
secpolicy_fs_mount_clearopts(cr, vfsp);
}
/*
* Refuse to mount a filesystem if we are in a local zone and the
* dataset is not visible.
*/
if (!INGLOBALZONE(curthread) &&
(!zone_dataset_visible(osname, &canwrite) || !canwrite)) {
error = EPERM;
goto out;
}
/*
* When doing a remount, we simply refresh our temporary properties
* according to those options set in the current VFS options.
*/
if (vfsp->vfs_flag & MS_REMOUNT) {
/* refresh mount options */
zfs_unregister_callbacks(vfsp->vfs_data);
error = zfs_register_callbacks(vfsp);
goto out;
}
DROP_GIANT();
error = zfs_domount(vfsp, osname);
PICKUP_GIANT();
out:
return (error);
}
static int
udf_mount(struct mount *mp)
{
struct vnode *devvp; /* vnode of the mount device */
struct thread *td;
struct udf_mnt *imp = NULL;
struct vfsoptlist *opts;
char *fspec, *cs_disk, *cs_local;
int error, len, *udf_flags;
struct nameidata nd, *ndp = &nd;
td = curthread;
opts = mp->mnt_optnew;
/*
* Unconditionally mount as read-only.
*/
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_RDONLY;
MNT_IUNLOCK(mp);
/*
* No root filesystem support. Probably not a big deal, since the
* bootloader doesn't understand UDF.
*/
if (mp->mnt_flag & MNT_ROOTFS)
return (ENOTSUP);
fspec = NULL;
error = vfs_getopt(opts, "from", (void **)&fspec, &len);
if (!error && fspec[len - 1] != '\0')
return (EINVAL);
if (mp->mnt_flag & MNT_UPDATE) {
return (0);
}
/* Check that the mount device exists */
if (fspec == NULL)
return (EINVAL);
NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
if ((error = namei(ndp)))
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
devvp = ndp->ni_vp;
if (vn_isdisk(devvp, &error) == 0) {
vput(devvp);
return (error);
}
/* Check the access rights on the mount device */
error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td);
if (error)
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
vput(devvp);
return (error);
}
if ((error = udf_mountfs(devvp, mp))) {
vrele(devvp);
return (error);
}
imp = VFSTOUDFFS(mp);
udf_flags = NULL;
error = vfs_getopt(opts, "flags", (void **)&udf_flags, &len);
if (error || len != sizeof(int))
return (EINVAL);
imp->im_flags = *udf_flags;
if (imp->im_flags & UDFMNT_KICONV && udf_iconv) {
cs_disk = NULL;
error = vfs_getopt(opts, "cs_disk", (void **)&cs_disk, &len);
if (!error && cs_disk[len - 1] != '\0')
return (EINVAL);
cs_local = NULL;
error = vfs_getopt(opts, "cs_local", (void **)&cs_local, &len);
if (!error && cs_local[len - 1] != '\0')
return (EINVAL);
udf_iconv->open(cs_local, cs_disk, &imp->im_d2l);
#if 0
udf_iconv->open(cs_disk, cs_local, &imp->im_l2d);
#endif
}
vfs_mountedfrom(mp, fspec);
return 0;
};
/* ARGSUSED */
static int
nfs_mount(struct mount *mp)
{
struct nfs_args args = {
.version = NFS_ARGSVERSION,
.addr = NULL,
.addrlen = sizeof (struct sockaddr_in),
.sotype = SOCK_STREAM,
.proto = 0,
.fh = NULL,
.fhsize = 0,
.flags = NFSMNT_RESVPORT,
.wsize = NFS_WSIZE,
.rsize = NFS_RSIZE,
.readdirsize = NFS_READDIRSIZE,
.timeo = 10,
.retrans = NFS_RETRANS,
.maxgrouplist = NFS_MAXGRPS,
.readahead = NFS_DEFRAHEAD,
.wcommitsize = 0, /* was: NQ_DEFLEASE */
.deadthresh = NFS_MAXDEADTHRESH, /* was: NQ_DEADTHRESH */
.hostname = NULL,
/* args version 4 */
.acregmin = NFS_MINATTRTIMO,
.acregmax = NFS_MAXATTRTIMO,
.acdirmin = NFS_MINDIRATTRTIMO,
.acdirmax = NFS_MAXDIRATTRTIMO,
};
int error, ret, has_nfs_args_opt;
int has_addr_opt, has_fh_opt, has_hostname_opt;
struct sockaddr *nam;
struct vnode *vp;
char hst[MNAMELEN];
size_t len;
u_char nfh[NFSX_V3FHMAX];
char *opt;
int nametimeo = NFS_DEFAULT_NAMETIMEO;
int negnametimeo = NFS_DEFAULT_NEGNAMETIMEO;
has_nfs_args_opt = 0;
has_addr_opt = 0;
has_fh_opt = 0;
has_hostname_opt = 0;
if (vfs_filteropt(mp->mnt_optnew, nfs_opts)) {
error = EINVAL;
goto out;
}
if ((mp->mnt_flag & (MNT_ROOTFS | MNT_UPDATE)) == MNT_ROOTFS) {
error = nfs_mountroot(mp);
goto out;
}
/*
* The old mount_nfs program passed the struct nfs_args
* from userspace to kernel. The new mount_nfs program
* passes string options via nmount() from userspace to kernel
* and we populate the struct nfs_args in the kernel.
*/
if (vfs_getopt(mp->mnt_optnew, "nfs_args", NULL, NULL) == 0) {
error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args,
sizeof args);
if (error)
goto out;
if (args.version != NFS_ARGSVERSION) {
error = EPROGMISMATCH;
goto out;
}
has_nfs_args_opt = 1;
}
if (vfs_getopt(mp->mnt_optnew, "dumbtimer", NULL, NULL) == 0)
args.flags |= NFSMNT_DUMBTIMR;
if (vfs_getopt(mp->mnt_optnew, "noconn", NULL, NULL) == 0)
args.flags |= NFSMNT_NOCONN;
if (vfs_getopt(mp->mnt_optnew, "conn", NULL, NULL) == 0)
args.flags |= NFSMNT_NOCONN;
if (vfs_getopt(mp->mnt_optnew, "nolockd", NULL, NULL) == 0)
args.flags |= NFSMNT_NOLOCKD;
if (vfs_getopt(mp->mnt_optnew, "lockd", NULL, NULL) == 0)
args.flags &= ~NFSMNT_NOLOCKD;
if (vfs_getopt(mp->mnt_optnew, "intr", NULL, NULL) == 0)
args.flags |= NFSMNT_INT;
if (vfs_getopt(mp->mnt_optnew, "rdirplus", NULL, NULL) == 0)
args.flags |= NFSMNT_RDIRPLUS;
if (vfs_getopt(mp->mnt_optnew, "resvport", NULL, NULL) == 0)
args.flags |= NFSMNT_RESVPORT;
if (vfs_getopt(mp->mnt_optnew, "noresvport", NULL, NULL) == 0)
args.flags &= ~NFSMNT_RESVPORT;
if (vfs_getopt(mp->mnt_optnew, "soft", NULL, NULL) == 0)
args.flags |= NFSMNT_SOFT;
if (vfs_getopt(mp->mnt_optnew, "hard", NULL, NULL) == 0)
args.flags &= ~NFSMNT_SOFT;
if (vfs_getopt(mp->mnt_optnew, "mntudp", NULL, NULL) == 0)
args.sotype = SOCK_DGRAM;
if (vfs_getopt(mp->mnt_optnew, "udp", NULL, NULL) == 0)
args.sotype = SOCK_DGRAM;
if (vfs_getopt(mp->mnt_optnew, "tcp", NULL, NULL) == 0)
args.sotype = SOCK_STREAM;
if (vfs_getopt(mp->mnt_optnew, "nfsv3", NULL, NULL) == 0)
args.flags |= NFSMNT_NFSV3;
if (vfs_getopt(mp->mnt_optnew, "nocto", NULL, NULL) == 0)
args.flags |= NFSMNT_NOCTO;
if (vfs_getopt(mp->mnt_optnew, "readdirsize", (void **)&opt, NULL) == 0) {
if (opt == NULL) {
vfs_mount_error(mp, "illegal readdirsize");
error = EINVAL;
goto out;
}
ret = sscanf(opt, "%d", &args.readdirsize);
if (ret != 1 || args.readdirsize <= 0) {
vfs_mount_error(mp, "illegal readdirsize: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_READDIRSIZE;
}
if (vfs_getopt(mp->mnt_optnew, "readahead", (void **)&opt, NULL) == 0) {
if (opt == NULL) {
vfs_mount_error(mp, "illegal readahead");
error = EINVAL;
goto out;
}
ret = sscanf(opt, "%d", &args.readahead);
if (ret != 1 || args.readahead <= 0) {
vfs_mount_error(mp, "illegal readahead: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_READAHEAD;
}
if (vfs_getopt(mp->mnt_optnew, "wsize", (void **)&opt, NULL) == 0) {
if (opt == NULL) {
vfs_mount_error(mp, "illegal wsize");
error = EINVAL;
goto out;
}
ret = sscanf(opt, "%d", &args.wsize);
if (ret != 1 || args.wsize <= 0) {
vfs_mount_error(mp, "illegal wsize: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_WSIZE;
}
if (vfs_getopt(mp->mnt_optnew, "rsize", (void **)&opt, NULL) == 0) {
if (opt == NULL) {
vfs_mount_error(mp, "illegal rsize");
error = EINVAL;
goto out;
}
ret = sscanf(opt, "%d", &args.rsize);
if (ret != 1 || args.rsize <= 0) {
vfs_mount_error(mp, "illegal wsize: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_RSIZE;
}
if (vfs_getopt(mp->mnt_optnew, "retrans", (void **)&opt, NULL) == 0) {
if (opt == NULL) {
vfs_mount_error(mp, "illegal retrans");
error = EINVAL;
goto out;
}
ret = sscanf(opt, "%d", &args.retrans);
if (ret != 1 || args.retrans <= 0) {
vfs_mount_error(mp, "illegal retrans: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_RETRANS;
}
if (vfs_getopt(mp->mnt_optnew, "acregmin", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.acregmin);
if (ret != 1 || args.acregmin < 0) {
vfs_mount_error(mp, "illegal acregmin: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_ACREGMIN;
}
if (vfs_getopt(mp->mnt_optnew, "acregmax", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.acregmax);
if (ret != 1 || args.acregmax < 0) {
vfs_mount_error(mp, "illegal acregmax: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_ACREGMAX;
}
if (vfs_getopt(mp->mnt_optnew, "acdirmin", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.acdirmin);
if (ret != 1 || args.acdirmin < 0) {
vfs_mount_error(mp, "illegal acdirmin: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_ACDIRMIN;
}
if (vfs_getopt(mp->mnt_optnew, "acdirmax", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.acdirmax);
if (ret != 1 || args.acdirmax < 0) {
vfs_mount_error(mp, "illegal acdirmax: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_ACDIRMAX;
}
if (vfs_getopt(mp->mnt_optnew, "wcommitsize", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.wcommitsize);
if (ret != 1 || args.wcommitsize < 0) {
vfs_mount_error(mp, "illegal wcommitsize: %s", opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_WCOMMITSIZE;
}
if (vfs_getopt(mp->mnt_optnew, "deadthresh", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.deadthresh);
if (ret != 1 || args.deadthresh <= 0) {
vfs_mount_error(mp, "illegal deadthresh: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_DEADTHRESH;
}
if (vfs_getopt(mp->mnt_optnew, "timeout", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.timeo);
if (ret != 1 || args.timeo <= 0) {
vfs_mount_error(mp, "illegal timeout: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_TIMEO;
}
if (vfs_getopt(mp->mnt_optnew, "maxgroups", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &args.maxgrouplist);
if (ret != 1 || args.maxgrouplist <= 0) {
vfs_mount_error(mp, "illegal maxgroups: %s",
opt);
error = EINVAL;
goto out;
}
args.flags |= NFSMNT_MAXGRPS;
}
if (vfs_getopt(mp->mnt_optnew, "nametimeo", (void **)&opt, NULL) == 0) {
ret = sscanf(opt, "%d", &nametimeo);
if (ret != 1 || nametimeo < 0) {
vfs_mount_error(mp, "illegal nametimeo: %s", opt);
error = EINVAL;
goto out;
}
}
if (vfs_getopt(mp->mnt_optnew, "negnametimeo", (void **)&opt, NULL)
== 0) {
ret = sscanf(opt, "%d", &negnametimeo);
if (ret != 1 || negnametimeo < 0) {
vfs_mount_error(mp, "illegal negnametimeo: %s",
opt);
error = EINVAL;
goto out;
}
}
if (vfs_getopt(mp->mnt_optnew, "addr", (void **)&args.addr,
&args.addrlen) == 0) {
has_addr_opt = 1;
if (args.addrlen > SOCK_MAXADDRLEN) {
error = ENAMETOOLONG;
goto out;
}
nam = malloc(args.addrlen, M_SONAME,
M_WAITOK);
bcopy(args.addr, nam, args.addrlen);
nam->sa_len = args.addrlen;
}
if (vfs_getopt(mp->mnt_optnew, "fh", (void **)&args.fh,
&args.fhsize) == 0) {
has_fh_opt = 1;
}
if (vfs_getopt(mp->mnt_optnew, "hostname", (void **)&args.hostname,
NULL) == 0) {
has_hostname_opt = 1;
}
if (args.hostname == NULL) {
vfs_mount_error(mp, "Invalid hostname");
error = EINVAL;
goto out;
}
if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) {
vfs_mount_error(mp, "Bad file handle");
error = EINVAL;
goto out;
}
if (mp->mnt_flag & MNT_UPDATE) {
struct nfsmount *nmp = VFSTONFS(mp);
if (nmp == NULL) {
error = EIO;
goto out;
}
/*
* If a change from TCP->UDP is done and there are thread(s)
* that have I/O RPC(s) in progress with a tranfer size
* greater than NFS_MAXDGRAMDATA, those thread(s) will be
* hung, retrying the RPC(s) forever. Usually these threads
* will be seen doing an uninterruptible sleep on wait channel
* "newnfsreq" (truncated to "newnfsre" by procstat).
*/
if (args.sotype == SOCK_DGRAM && nmp->nm_sotype == SOCK_STREAM)
tprintf(curthread->td_proc, LOG_WARNING,
"Warning: mount -u that changes TCP->UDP can result in hung threads\n");
/*
* When doing an update, we can't change from or to
* v3, switch lockd strategies or change cookie translation
*/
args.flags = (args.flags &
~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
(nmp->nm_flag &
(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
nfs_decode_args(mp, nmp, &args, NULL);
goto out;
}
/*
* Make the nfs_ip_paranoia sysctl serve as the default connection
* or no-connection mode for those protocols that support
* no-connection mode (the flag will be cleared later for protocols
* that do not support no-connection mode). This will allow a client
* to receive replies from a different IP then the request was
* sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid),
* not 0.
*/
if (nfs_ip_paranoia == 0)
args.flags |= NFSMNT_NOCONN;
if (has_nfs_args_opt) {
/*
* In the 'nfs_args' case, the pointers in the args
* structure are in userland - we copy them in here.
*/
if (!has_fh_opt) {
error = copyin((caddr_t)args.fh, (caddr_t)nfh,
args.fhsize);
if (error) {
goto out;
}
args.fh = nfh;
}
if (!has_hostname_opt) {
error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
if (error) {
goto out;
}
bzero(&hst[len], MNAMELEN - len);
args.hostname = hst;
}
if (!has_addr_opt) {
/* sockargs() call must be after above copyin() calls */
error = getsockaddr(&nam, (caddr_t)args.addr,
args.addrlen);
if (error) {
goto out;
}
}
} else if (has_addr_opt == 0) {
vfs_mount_error(mp, "No server address");
error = EINVAL;
goto out;
}
error = mountnfs(&args, mp, nam, args.hostname, &vp,
curthread->td_ucred, nametimeo, negnametimeo);
out:
if (!error) {
MNT_ILOCK(mp);
mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
MNT_IUNLOCK(mp);
}
return (error);
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* bcopy() them in mountnfs(), but I wanted to detect errors before
* doing the sockargs() call because sockargs() allocates an mbuf and
* an error after that means that I have to release the mbuf.
*/
/* ARGSUSED */
static int
nfs_cmount(struct mntarg *ma, void *data, uint64_t flags)
{
int error;
struct nfs_args args;
error = copyin(data, &args, sizeof (struct nfs_args));
if (error)
return error;
ma = mount_arg(ma, "nfs_args", &args, sizeof args);
error = kernel_mount(ma, flags);
return (error);
}
/*
* Mount null layer
*/
static int
nullfs_mount(struct mount *mp)
{
int error = 0;
struct vnode *lowerrootvp, *vp;
struct vnode *nullm_rootvp;
struct null_mount *xmp;
struct thread *td = curthread;
char *target;
int isvnunlocked = 0, len;
struct nameidata nd, *ndp = &nd;
NULLFSDEBUG("nullfs_mount(mp = %p)\n", (void *)mp);
if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_NULLFS))
return (EPERM);
if (mp->mnt_flag & MNT_ROOTFS)
return (EOPNOTSUPP);
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE) {
/*
* Only support update mounts for NFS export.
*/
if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
return (0);
else
return (EOPNOTSUPP);
}
/*
* Get argument
*/
error = vfs_getopt(mp->mnt_optnew, "target", (void **)&target, &len);
if (error || target[len - 1] != '\0')
return (EINVAL);
/*
* Unlock lower node to avoid possible deadlock.
*/
if ((mp->mnt_vnodecovered->v_op == &null_vnodeops) &&
VOP_ISLOCKED(mp->mnt_vnodecovered) == LK_EXCLUSIVE) {
VOP_UNLOCK(mp->mnt_vnodecovered, 0);
isvnunlocked = 1;
}
/*
* Find lower node
*/
NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, UIO_SYSSPACE, target, curthread);
error = namei(ndp);
/*
* Re-lock vnode.
* XXXKIB This is deadlock-prone as well.
*/
if (isvnunlocked)
vn_lock(mp->mnt_vnodecovered, LK_EXCLUSIVE | LK_RETRY);
if (error)
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
/*
* Sanity check on lower vnode
*/
lowerrootvp = ndp->ni_vp;
/*
* Check multi null mount to avoid `lock against myself' panic.
*/
if (lowerrootvp == VTONULL(mp->mnt_vnodecovered)->null_lowervp) {
NULLFSDEBUG("nullfs_mount: multi null mount?\n");
vput(lowerrootvp);
return (EDEADLK);
}
xmp = (struct null_mount *) malloc(sizeof(struct null_mount),
M_NULLFSMNT, M_WAITOK | M_ZERO);
/*
* Save reference to underlying FS
*/
xmp->nullm_vfs = lowerrootvp->v_mount;
/*
* Save reference. Each mount also holds
* a reference on the root vnode.
*/
error = null_nodeget(mp, lowerrootvp, &vp);
/*
* Make sure the node alias worked
*/
if (error) {
free(xmp, M_NULLFSMNT);
return (error);
}
/*
* Keep a held reference to the root vnode.
* It is vrele'd in nullfs_unmount.
*/
nullm_rootvp = vp;
nullm_rootvp->v_vflag |= VV_ROOT;
xmp->nullm_rootvp = nullm_rootvp;
/*
* Unlock the node (either the lower or the alias)
*/
VOP_UNLOCK(vp, 0);
if (NULLVPTOLOWERVP(nullm_rootvp)->v_mount->mnt_flag & MNT_LOCAL) {
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
MNT_IUNLOCK(mp);
}
xmp->nullm_flags |= NULLM_CACHE;
if (vfs_getopt(mp->mnt_optnew, "nocache", NULL, NULL) == 0)
xmp->nullm_flags &= ~NULLM_CACHE;
MNT_ILOCK(mp);
if ((xmp->nullm_flags & NULLM_CACHE) != 0) {
mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag &
(MNTK_SHARED_WRITES | MNTK_LOOKUP_SHARED |
MNTK_EXTENDED_SHARED);
}
mp->mnt_kern_flag |= MNTK_LOOKUP_EXCL_DOTDOT;
MNT_IUNLOCK(mp);
mp->mnt_data = xmp;
vfs_getnewfsid(mp);
if ((xmp->nullm_flags & NULLM_CACHE) != 0) {
MNT_ILOCK(xmp->nullm_vfs);
TAILQ_INSERT_TAIL(&xmp->nullm_vfs->mnt_uppers, mp,
mnt_upper_link);
MNT_IUNLOCK(xmp->nullm_vfs);
}
vfs_mountedfrom(mp, target);
NULLFSDEBUG("nullfs_mount: lower %s, alias at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
return (0);
}
/*
* Mount null layer
*/
static int
nullfs_mount(struct mount *mp)
{
int error = 0;
struct vnode *lowerrootvp, *vp;
struct vnode *nullm_rootvp;
struct null_mount *xmp;
char *target;
int isvnunlocked = 0, len;
struct nameidata nd, *ndp = &nd;
NULLFSDEBUG("nullfs_mount(mp = %p)\n", (void *)mp);
if (mp->mnt_flag & MNT_ROOTFS)
return (EOPNOTSUPP);
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE) {
/*
* Only support update mounts for NFS export.
*/
if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
return (0);
else
return (EOPNOTSUPP);
}
/*
* Get argument
*/
error = vfs_getopt(mp->mnt_optnew, "target", (void **)&target, &len);
if (error || target[len - 1] != '\0')
return (EINVAL);
/*
* Unlock lower node to avoid deadlock.
* (XXX) VOP_ISLOCKED is needed?
*/
if ((mp->mnt_vnodecovered->v_op == &null_vnodeops) &&
VOP_ISLOCKED(mp->mnt_vnodecovered)) {
VOP_UNLOCK(mp->mnt_vnodecovered, 0);
isvnunlocked = 1;
}
/*
* Find lower node
*/
NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, UIO_SYSSPACE, target, curthread);
error = namei(ndp);
/*
* Re-lock vnode.
*/
if (isvnunlocked && !VOP_ISLOCKED(mp->mnt_vnodecovered))
vn_lock(mp->mnt_vnodecovered, LK_EXCLUSIVE | LK_RETRY);
if (error)
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
/*
* Sanity check on lower vnode
*/
lowerrootvp = ndp->ni_vp;
/*
* Check multi null mount to avoid `lock against myself' panic.
*/
if (lowerrootvp == VTONULL(mp->mnt_vnodecovered)->null_lowervp) {
NULLFSDEBUG("nullfs_mount: multi null mount?\n");
vput(lowerrootvp);
return (EDEADLK);
}
xmp = (struct null_mount *) malloc(sizeof(struct null_mount),
M_NULLFSMNT, M_WAITOK); /* XXX */
/*
* Save reference to underlying FS
*/
xmp->nullm_vfs = lowerrootvp->v_mount;
/*
* Save reference. Each mount also holds
* a reference on the root vnode.
*/
error = null_nodeget(mp, lowerrootvp, &vp);
/*
* Make sure the node alias worked
*/
if (error) {
VOP_UNLOCK(vp, 0);
vrele(lowerrootvp);
free(xmp, M_NULLFSMNT); /* XXX */
return (error);
}
/*
* Keep a held reference to the root vnode.
* It is vrele'd in nullfs_unmount.
*/
nullm_rootvp = vp;
nullm_rootvp->v_vflag |= VV_ROOT;
xmp->nullm_rootvp = nullm_rootvp;
/*
* Unlock the node (either the lower or the alias)
*/
VOP_UNLOCK(vp, 0);
if (NULLVPTOLOWERVP(nullm_rootvp)->v_mount->mnt_flag & MNT_LOCAL) {
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
MNT_IUNLOCK(mp);
}
MNT_ILOCK(mp);
mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag & MNTK_MPSAFE;
MNT_IUNLOCK(mp);
mp->mnt_data = xmp;
vfs_getnewfsid(mp);
vfs_mountedfrom(mp, target);
NULLFSDEBUG("nullfs_mount: lower %s, alias at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
return (0);
}
