4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
25 * Copyright 2016 Toomas Soome <tsoome@me.com>
26 * Copyright (c) 2016 by Delphix. All rights reserved.
27 * Copyright 2016 Nexenta Systems, Inc.
30 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
31 /* All Rights Reserved */
34 * University Copyright- Copyright (c) 1982, 1986, 1988
35 * The Regents of the University of California
38 * University Acknowledgment- Portions of this document are derived from
39 * software developed by the University of California, Berkeley, and its
43 #include <sys/types.h>
44 #include <sys/t_lock.h>
45 #include <sys/param.h>
46 #include <sys/errno.h>
48 #include <sys/fstyp.h>
50 #include <sys/systm.h>
52 #include <sys/mount.h>
54 #include <sys/vfs_opreg.h>
56 #include <sys/mntent.h>
58 #include <sys/statvfs.h>
59 #include <sys/statfs.h>
61 #include <sys/vnode.h>
62 #include <sys/rwstlock.h>
66 #include <sys/atomic.h>
67 #include <sys/cmn_err.h>
70 #include <sys/debug.h>
71 #include <sys/vnode.h>
72 #include <sys/modctl.h>
74 #include <sys/pathname.h>
75 #include <sys/bootconf.h>
76 #include <sys/dumphdr.h>
77 #include <sys/dc_ki.h>
79 #include <sys/sunddi.h>
80 #include <sys/sysmacros.h>
82 #include <sys/policy.h>
84 #include <sys/objfs.h>
85 #include <sys/console.h>
86 #include <sys/reboot.h>
91 #include <sys/bootprops.h>
95 #include <fs/fs_subr.h>
96 /* Private interfaces to create vopstats-related data structures */
97 extern void initialize_vopstats(vopstats_t
*);
98 extern vopstats_t
*get_fstype_vopstats(struct vfs
*, struct vfssw
*);
99 extern vsk_anchor_t
*get_vskstat_anchor(struct vfs
*);
101 static void vfs_clearmntopt_nolock(mntopts_t
*, const char *, int);
102 static void vfs_setmntopt_nolock(mntopts_t
*, const char *,
103 const char *, int, int);
104 static int vfs_optionisset_nolock(const mntopts_t
*, const char *, char **);
105 static void vfs_freemnttab(struct vfs
*);
106 static void vfs_freeopt(mntopt_t
*);
107 static void vfs_swapopttbl_nolock(mntopts_t
*, mntopts_t
*);
108 static void vfs_swapopttbl(mntopts_t
*, mntopts_t
*);
109 static void vfs_copyopttbl_extend(const mntopts_t
*, mntopts_t
*, int);
110 static void vfs_createopttbl_extend(mntopts_t
*, const char *,
112 static char **vfs_copycancelopt_extend(char **const, int);
113 static void vfs_freecancelopt(char **);
114 static void getrootfs(char **, char **);
115 static int getmacpath(dev_info_t
*, void *);
116 static void vfs_mnttabvp_setup(void);
119 struct ipmnt
*mip_next
;
121 struct vfs
*mip_vfsp
;
124 static kmutex_t vfs_miplist_mutex
;
125 static struct ipmnt
*vfs_miplist
= NULL
;
126 static struct ipmnt
*vfs_miplist_end
= NULL
;
128 static kmem_cache_t
*vfs_cache
; /* Pointer to VFS kmem cache */
133 vnode_t
*rootdir
; /* pointer to root inode vnode. */
134 vnode_t
*devicesdir
; /* pointer to inode of devices root */
135 vnode_t
*devdir
; /* pointer to inode of dev root */
137 char *server_rootpath
; /* root path for diskless clients */
138 char *server_hostname
; /* hostname of diskless server */
140 static struct vfs root
;
141 static struct vfs devices
;
142 static struct vfs dev
;
143 struct vfs
*rootvfs
= &root
; /* pointer to root vfs; head of VFS list. */
144 rvfs_t
*rvfs_list
; /* array of vfs ptrs for vfs hash list */
145 int vfshsz
= 512; /* # of heads/locks in vfs hash arrays */
146 /* must be power of 2! */
147 timespec_t vfs_mnttab_ctime
; /* mnttab created time */
148 timespec_t vfs_mnttab_mtime
; /* mnttab last modified time */
149 char *vfs_dummyfstype
= "\0";
150 struct pollhead vfs_pollhd
; /* for mnttab pollers */
151 struct vnode
*vfs_mntdummyvp
; /* to fake mnttab read/write for file events */
152 int mntfstype
; /* will be set once mnt fs is mounted */
155 * Table for generic options recognized in the VFS layer and acted
156 * on at this level before parsing file system specific options.
157 * The nosuid option is stronger than any of the devices and setuid
158 * options, so those are canceled when nosuid is seen.
160 * All options which are added here need to be added to the
161 * list of standard options in usr/src/cmd/fs.d/fslib.c as well.
164 * VFS Mount options table
166 static char *ro_cancel
[] = { MNTOPT_RW
, NULL
};
167 static char *rw_cancel
[] = { MNTOPT_RO
, NULL
};
168 static char *suid_cancel
[] = { MNTOPT_NOSUID
, NULL
};
169 static char *nosuid_cancel
[] = { MNTOPT_SUID
, MNTOPT_DEVICES
, MNTOPT_NODEVICES
,
170 MNTOPT_NOSETUID
, MNTOPT_SETUID
, NULL
};
171 static char *devices_cancel
[] = { MNTOPT_NODEVICES
, NULL
};
172 static char *nodevices_cancel
[] = { MNTOPT_DEVICES
, NULL
};
173 static char *setuid_cancel
[] = { MNTOPT_NOSETUID
, NULL
};
174 static char *nosetuid_cancel
[] = { MNTOPT_SETUID
, NULL
};
175 static char *nbmand_cancel
[] = { MNTOPT_NONBMAND
, NULL
};
176 static char *nonbmand_cancel
[] = { MNTOPT_NBMAND
, NULL
};
177 static char *exec_cancel
[] = { MNTOPT_NOEXEC
, NULL
};
178 static char *noexec_cancel
[] = { MNTOPT_EXEC
, NULL
};
180 static const mntopt_t mntopts
[] = {
182 * option name cancel options default arg flags
184 { MNTOPT_REMOUNT
, NULL
, NULL
,
185 MO_NODISPLAY
, (void *)0 },
186 { MNTOPT_RO
, ro_cancel
, NULL
, 0,
188 { MNTOPT_RW
, rw_cancel
, NULL
, 0,
190 { MNTOPT_SUID
, suid_cancel
, NULL
, 0,
192 { MNTOPT_NOSUID
, nosuid_cancel
, NULL
, 0,
194 { MNTOPT_DEVICES
, devices_cancel
, NULL
, 0,
196 { MNTOPT_NODEVICES
, nodevices_cancel
, NULL
, 0,
198 { MNTOPT_SETUID
, setuid_cancel
, NULL
, 0,
200 { MNTOPT_NOSETUID
, nosetuid_cancel
, NULL
, 0,
202 { MNTOPT_NBMAND
, nbmand_cancel
, NULL
, 0,
204 { MNTOPT_NONBMAND
, nonbmand_cancel
, NULL
, 0,
206 { MNTOPT_EXEC
, exec_cancel
, NULL
, 0,
208 { MNTOPT_NOEXEC
, noexec_cancel
, NULL
, 0,
212 const mntopts_t vfs_mntopts
= {
213 sizeof (mntopts
) / sizeof (mntopt_t
),
214 (mntopt_t
*)&mntopts
[0]
218 * File system operation dispatch functions.
222 fsop_mount(vfs_t
*vfsp
, vnode_t
*mvp
, struct mounta
*uap
, cred_t
*cr
)
224 return (*(vfsp
)->vfs_op
->vfs_mount
)(vfsp
, mvp
, uap
, cr
);
228 fsop_unmount(vfs_t
*vfsp
, int flag
, cred_t
*cr
)
230 return (*(vfsp
)->vfs_op
->vfs_unmount
)(vfsp
, flag
, cr
);
234 fsop_root(vfs_t
*vfsp
, vnode_t
**vpp
)
237 int ret
= (*(vfsp
)->vfs_op
->vfs_root
)(vfsp
, vpp
);
239 * Make sure this root has a path. With lofs, it is possible to have
242 if (ret
== 0 && vfsp
->vfs_mntpt
!= NULL
&& (*vpp
)->v_path
== NULL
) {
243 mntpt
= vfs_getmntpoint(vfsp
);
244 vn_setpath_str(*vpp
, refstr_value(mntpt
),
245 strlen(refstr_value(mntpt
)));
253 fsop_statfs(vfs_t
*vfsp
, statvfs64_t
*sp
)
255 return (*(vfsp
)->vfs_op
->vfs_statvfs
)(vfsp
, sp
);
259 fsop_sync(vfs_t
*vfsp
, short flag
, cred_t
*cr
)
261 return (*(vfsp
)->vfs_op
->vfs_sync
)(vfsp
, flag
, cr
);
265 fsop_vget(vfs_t
*vfsp
, vnode_t
**vpp
, fid_t
*fidp
)
268 * In order to handle system attribute fids in a manner
269 * transparent to the underlying fs, we embed the fid for
270 * the sysattr parent object in the sysattr fid and tack on
271 * some extra bytes that only the sysattr layer knows about.
273 * This guarantees that sysattr fids are larger than other fids
274 * for this vfs. If the vfs supports the sysattr view interface
275 * (as indicated by VFSFT_SYSATTR_VIEWS), we cannot have a size
276 * collision with XATTR_FIDSZ.
278 if (vfs_has_feature(vfsp
, VFSFT_SYSATTR_VIEWS
) &&
279 fidp
->fid_len
== XATTR_FIDSZ
)
280 return (xattr_dir_vget(vfsp
, vpp
, fidp
));
282 return (*(vfsp
)->vfs_op
->vfs_vget
)(vfsp
, vpp
, fidp
);
286 fsop_mountroot(vfs_t
*vfsp
, enum whymountroot reason
)
288 return (*(vfsp
)->vfs_op
->vfs_mountroot
)(vfsp
, reason
);
292 fsop_freefs(vfs_t
*vfsp
)
294 (*(vfsp
)->vfs_op
->vfs_freevfs
)(vfsp
);
298 fsop_vnstate(vfs_t
*vfsp
, vnode_t
*vp
, vntrans_t nstate
)
300 return ((*(vfsp
)->vfs_op
->vfs_vnstate
)(vfsp
, vp
, nstate
));
304 fsop_sync_by_kind(int fstype
, short flag
, cred_t
*cr
)
306 ASSERT((fstype
>= 0) && (fstype
< nfstype
));
308 if (ALLOCATED_VFSSW(&vfssw
[fstype
]) && VFS_INSTALLED(&vfssw
[fstype
]))
309 return (*vfssw
[fstype
].vsw_vfsops
.vfs_sync
) (NULL
, flag
, cr
);
315 * File system initialization. vfs_setfsops() must be called from a file
316 * system's init routine.
320 fs_copyfsops(const fs_operation_def_t
*template, vfsops_t
*actual
,
323 static const fs_operation_trans_def_t vfs_ops_table
[] = {
324 VFSNAME_MOUNT
, offsetof(vfsops_t
, vfs_mount
),
327 VFSNAME_UNMOUNT
, offsetof(vfsops_t
, vfs_unmount
),
330 VFSNAME_ROOT
, offsetof(vfsops_t
, vfs_root
),
333 VFSNAME_STATVFS
, offsetof(vfsops_t
, vfs_statvfs
),
336 VFSNAME_SYNC
, offsetof(vfsops_t
, vfs_sync
),
337 (fs_generic_func_p
) fs_sync
,
338 (fs_generic_func_p
) fs_sync
, /* No errors allowed */
340 VFSNAME_VGET
, offsetof(vfsops_t
, vfs_vget
),
343 VFSNAME_MOUNTROOT
, offsetof(vfsops_t
, vfs_mountroot
),
346 VFSNAME_FREEVFS
, offsetof(vfsops_t
, vfs_freevfs
),
347 (fs_generic_func_p
)fs_freevfs
,
348 (fs_generic_func_p
)fs_freevfs
, /* Shouldn't fail */
350 VFSNAME_VNSTATE
, offsetof(vfsops_t
, vfs_vnstate
),
351 (fs_generic_func_p
)fs_nosys
,
352 (fs_generic_func_p
)fs_nosys
,
357 return (fs_build_vector(actual
, unused_ops
, vfs_ops_table
, template));
363 if (strcmp(rootfs
.bo_fstype
, MNTTYPE_ZFS
) == 0)
368 vfs_setfsops(int fstype
, const fs_operation_def_t
*template, vfsops_t
**actual
)
374 * Verify that fstype refers to a valid fs. Note that
375 * 0 is valid since it's used to set "stray" ops.
377 if ((fstype
< 0) || (fstype
>= nfstype
))
380 if (!ALLOCATED_VFSSW(&vfssw
[fstype
]))
383 /* Set up the operations vector. */
385 error
= fs_copyfsops(template, &vfssw
[fstype
].vsw_vfsops
, &unused_ops
);
390 vfssw
[fstype
].vsw_flag
|= VSW_INSTALLED
;
393 *actual
= &vfssw
[fstype
].vsw_vfsops
;
397 cmn_err(CE_WARN
, "vfs_setfsops: %s: %d operations supplied "
398 "but not used", vfssw
[fstype
].vsw_name
, unused_ops
);
405 vfs_makefsops(const fs_operation_def_t
*template, vfsops_t
**actual
)
410 *actual
= (vfsops_t
*)kmem_alloc(sizeof (vfsops_t
), KM_SLEEP
);
412 error
= fs_copyfsops(template, *actual
, &unused_ops
);
414 kmem_free(*actual
, sizeof (vfsops_t
));
423 * Free a vfsops structure created as a result of vfs_makefsops().
424 * NOTE: For a vfsops structure initialized by vfs_setfsops(), use
425 * vfs_freevfsops_by_type().
428 vfs_freevfsops(vfsops_t
*vfsops
)
430 kmem_free(vfsops
, sizeof (vfsops_t
));
434 * Since the vfsops structure is part of the vfssw table and wasn't
435 * really allocated, we're not really freeing anything. We keep
436 * the name for consistency with vfs_freevfsops(). We do, however,
437 * need to take care of a little bookkeeping.
438 * NOTE: For a vfsops structure created by vfs_setfsops(), use
439 * vfs_freevfsops_by_type().
442 vfs_freevfsops_by_type(int fstype
)
445 /* Verify that fstype refers to a loaded fs (and not fsid 0). */
446 if ((fstype
<= 0) || (fstype
>= nfstype
))
450 if ((vfssw
[fstype
].vsw_flag
& VSW_INSTALLED
) == 0) {
455 vfssw
[fstype
].vsw_flag
&= ~VSW_INSTALLED
;
461 /* Support routines used to reference vfs_op */
463 /* Set the operations vector for a vfs */
465 vfs_setops(vfs_t
*vfsp
, vfsops_t
*vfsops
)
469 ASSERT(vfsp
!= NULL
);
470 ASSERT(vfsops
!= NULL
);
474 if (vfsp
->vfs_femhead
== NULL
&&
475 atomic_cas_ptr(&vfsp
->vfs_op
, op
, vfsops
) == op
) {
478 fsem_setvfsops(vfsp
, vfsops
);
481 /* Retrieve the operations vector for a vfs */
483 vfs_getops(vfs_t
*vfsp
)
487 ASSERT(vfsp
!= NULL
);
491 if (vfsp
->vfs_femhead
== NULL
&& op
== vfsp
->vfs_op
) {
494 return (fsem_getvfsops(vfsp
));
499 * Returns non-zero (1) if the vfsops matches that of the vfs.
500 * Returns zero (0) if not.
503 vfs_matchops(vfs_t
*vfsp
, vfsops_t
*vfsops
)
505 return (vfs_getops(vfsp
) == vfsops
);
509 * Returns non-zero (1) if the file system has installed a non-default,
510 * non-error vfs_sync routine. Returns zero (0) otherwise.
513 vfs_can_sync(vfs_t
*vfsp
)
515 /* vfs_sync() routine is not the default/error function */
516 return (vfs_getops(vfsp
)->vfs_sync
!= fs_sync
);
520 * Initialize a vfs structure.
523 vfs_init(vfs_t
*vfsp
, vfsops_t
*op
, void *data
)
525 /* Other initialization has been moved to vfs_alloc() */
527 vfsp
->vfs_next
= vfsp
;
528 vfsp
->vfs_prev
= vfsp
;
529 vfsp
->vfs_zone_next
= vfsp
;
530 vfsp
->vfs_zone_prev
= vfsp
;
531 vfsp
->vfs_lofi_id
= 0;
532 sema_init(&vfsp
->vfs_reflock
, 1, NULL
, SEMA_DEFAULT
, NULL
);
534 vfsp
->vfs_data
= (data
);
535 vfs_setops((vfsp
), (op
));
539 * Allocate and initialize the vfs implementation private data
540 * structure, vfs_impl_t.
543 vfsimpl_setup(vfs_t
*vfsp
)
547 if (vfsp
->vfs_implp
!= NULL
) {
551 vfsp
->vfs_implp
= kmem_alloc(sizeof (vfs_impl_t
), KM_SLEEP
);
552 /* Note that these are #define'd in vfs.h */
553 vfsp
->vfs_vskap
= NULL
;
554 vfsp
->vfs_fstypevsp
= NULL
;
556 /* Set size of counted array, then zero the array */
557 vfsp
->vfs_featureset
[0] = VFS_FEATURE_MAXSZ
- 1;
558 for (i
= 1; i
< VFS_FEATURE_MAXSZ
; i
++) {
559 vfsp
->vfs_featureset
[i
] = 0;
564 * Release the vfs_impl_t structure, if it exists. Some unbundled
565 * filesystems may not use the newer version of vfs and thus
566 * would not contain this implementation private data structure.
569 vfsimpl_teardown(vfs_t
*vfsp
)
571 vfs_impl_t
*vip
= vfsp
->vfs_implp
;
576 kmem_free(vfsp
->vfs_implp
, sizeof (vfs_impl_t
));
577 vfsp
->vfs_implp
= NULL
;
581 * VFS system calls: mount, umount, syssync, statfs, fstatfs, statvfs,
582 * fstatvfs, and sysfs moved to common/syscall.
586 * Update every mounted file system. We call the vfs_sync operation of
587 * each file system type, passing it a NULL vfsp to indicate that all
588 * mounted file systems of that type should be updated.
595 for (vswp
= &vfssw
[1]; vswp
< &vfssw
[nfstype
]; vswp
++) {
596 if (ALLOCATED_VFSSW(vswp
) && VFS_INSTALLED(vswp
)) {
599 (void) (*vswp
->vsw_vfsops
.vfs_sync
)(NULL
, flag
,
601 vfs_unrefvfssw(vswp
);
618 krwlock_t vfssw_lock
; /* lock accesses to vfssw */
621 * Lock for accessing the vfs linked list. Initialized in vfs_mountroot(),
622 * but otherwise should be accessed only via vfs_list_lock() and
623 * vfs_list_unlock(). Also used to protect the timestamp for mods to the list.
625 static krwlock_t vfslist
;
628 * Mount devfs on /devices. This is done right after root is mounted
629 * to provide device access support for the system
632 vfs_mountdevices(void)
636 struct mounta mounta
= { /* fake mounta for devfs_mount() */
648 * _init devfs module to fill in the vfssw
650 if (modload("fs", "devfs") == -1)
651 panic("Cannot _init devfs module");
657 vsw
= vfs_getvfsswbyname("devfs");
658 VFS_INIT(&devices
, &vsw
->vsw_vfsops
, NULL
);
664 if (lookupname("/devices", UIO_SYSSPACE
, FOLLOW
, NULLVPP
, &mvp
))
665 panic("Cannot find /devices");
668 * Perform the mount of /devices
670 if (VFS_MOUNT(&devices
, mvp
, &mounta
, CRED()))
671 panic("Cannot mount /devices");
676 * Set appropriate members and add to vfs list for mnttab display
678 vfs_setresource(&devices
, "/devices", 0);
679 vfs_setmntpoint(&devices
, "/devices", 0);
682 * Hold the root of /devices so it won't go away
684 if (VFS_ROOT(&devices
, &devicesdir
))
685 panic("vfs_mountdevices: not devices root");
687 if (vfs_lock(&devices
) != 0) {
689 cmn_err(CE_NOTE
, "Cannot acquire vfs_lock of /devices");
693 if (vn_vfswlock(mvp
) != 0) {
694 vfs_unlock(&devices
);
696 cmn_err(CE_NOTE
, "Cannot acquire vfswlock of /devices");
700 vfs_add(mvp
, &devices
, 0);
702 vfs_unlock(&devices
);
707 * mount the first instance of /dev to root and remain mounted
714 struct mounta mounta
= { /* fake mounta for sdev_mount() */
717 MS_SYSSPACE
| MS_OVERLAY
,
726 * _init dev module to fill in the vfssw
728 if (modload("fs", "dev") == -1)
729 cmn_err(CE_PANIC
, "Cannot _init dev module\n");
735 vsw
= vfs_getvfsswbyname("dev");
736 VFS_INIT(&dev
, &vsw
->vsw_vfsops
, NULL
);
742 if (lookupname("/dev", UIO_SYSSPACE
, FOLLOW
, NULLVPP
, &mvp
))
743 cmn_err(CE_PANIC
, "Cannot find /dev\n");
746 * Perform the mount of /dev
748 if (VFS_MOUNT(&dev
, mvp
, &mounta
, CRED()))
749 cmn_err(CE_PANIC
, "Cannot mount /dev 1\n");
754 * Set appropriate members and add to vfs list for mnttab display
756 vfs_setresource(&dev
, "/dev", 0);
757 vfs_setmntpoint(&dev
, "/dev", 0);
760 * Hold the root of /dev so it won't go away
762 if (VFS_ROOT(&dev
, &devdir
))
763 cmn_err(CE_PANIC
, "vfs_mountdev1: not dev root");
765 if (vfs_lock(&dev
) != 0) {
767 cmn_err(CE_NOTE
, "Cannot acquire vfs_lock of /dev");
771 if (vn_vfswlock(mvp
) != 0) {
774 cmn_err(CE_NOTE
, "Cannot acquire vfswlock of /dev");
778 vfs_add(mvp
, &dev
, 0);
785 * Mount required filesystem. This is done right after root is mounted.
788 vfs_mountfs(char *module
, char *spec
, char *path
)
791 struct mounta mounta
;
794 mounta
.flags
= MS_SYSSPACE
| MS_DATA
;
795 mounta
.fstype
= module
;
798 if (lookupname(path
, UIO_SYSSPACE
, FOLLOW
, NULLVPP
, &mvp
)) {
799 cmn_err(CE_WARN
, "Cannot find %s", path
);
802 if (domount(NULL
, &mounta
, mvp
, CRED(), &vfsp
))
803 cmn_err(CE_WARN
, "Cannot mount %s", path
);
810 * vfs_mountroot is called by main() to mount the root filesystem.
815 struct vnode
*rvp
= NULL
;
821 rw_init(&vfssw_lock
, NULL
, RW_DEFAULT
, NULL
);
822 rw_init(&vfslist
, NULL
, RW_DEFAULT
, NULL
);
825 * Alloc the vfs hash bucket array and locks
827 rvfs_list
= kmem_zalloc(vfshsz
* sizeof (rvfs_t
), KM_SLEEP
);
830 * Call machine-dependent routine "rootconf" to choose a root
834 panic("vfs_mountroot: cannot mount root");
836 * Get vnode for '/'. Set up rootdir, u.u_rdir and u.u_cdir
837 * to point to it. These are used by lookuppn() so that it
838 * knows where to start from ('/' or '.').
840 vfs_setmntpoint(rootvfs
, "/", 0);
841 if (VFS_ROOT(rootvfs
, &rootdir
))
842 panic("vfs_mountroot: no root vnode");
845 * At this point, the process tree consists of p0 and possibly some
846 * direct children of p0. (i.e. there are no grandchildren)
848 * Walk through them all, setting their current directory.
850 mutex_enter(&pidlock
);
851 for (p
= practive
; p
!= NULL
; p
= p
->p_next
) {
852 ASSERT(p
== &p0
|| p
->p_parent
== &p0
);
854 PTOU(p
)->u_cdir
= rootdir
;
855 VN_HOLD(PTOU(p
)->u_cdir
);
856 PTOU(p
)->u_rdir
= NULL
;
858 mutex_exit(&pidlock
);
861 * Setup the global zone's rootvp, now that it exists.
863 global_zone
->zone_rootvp
= rootdir
;
864 VN_HOLD(global_zone
->zone_rootvp
);
867 * Notify the module code that it can begin using the
868 * root filesystem instead of the boot program's services.
873 * Special handling for a ZFS root file system.
878 * Set up mnttab information for root
880 vfs_setresource(rootvfs
, rootfs
.bo_name
, 0);
883 * Notify cluster software that the root filesystem is available.
887 /* Now that we're all done with the root FS, set up its vopstats */
888 if ((vswp
= vfs_getvfsswbyvfsops(vfs_getops(rootvfs
))) != NULL
) {
889 /* Set flag for statistics collection */
890 if (vswp
->vsw_flag
& VSW_STATS
) {
891 initialize_vopstats(&rootvfs
->vfs_vopstats
);
892 rootvfs
->vfs_flag
|= VFS_STATS
;
893 rootvfs
->vfs_fstypevsp
=
894 get_fstype_vopstats(rootvfs
, vswp
);
895 rootvfs
->vfs_vskap
= get_vskstat_anchor(rootvfs
);
897 vfs_unrefvfssw(vswp
);
901 * Mount /devices, /dev instance 1, /system/contract, /etc/mnttab,
902 * /etc/svc/volatile, /etc/dfs/sharetab, /system/object, and /proc.
907 vfs_mountfs("ctfs", "ctfs", CTFS_ROOT
);
908 vfs_mountfs("proc", "/proc", "/proc");
909 vfs_mountfs("mntfs", "/etc/mnttab", "/etc/mnttab");
910 vfs_mountfs("tmpfs", "/etc/svc/volatile", "/etc/svc/volatile");
911 vfs_mountfs("objfs", "objfs", OBJFS_ROOT
);
912 vfs_mountfs("bootfs", "bootfs", "/system/boot");
914 if (getzoneid() == GLOBAL_ZONEID
) {
915 vfs_mountfs("sharefs", "sharefs", "/etc/dfs/sharetab");
918 if (strcmp(rootfs
.bo_fstype
, "zfs") != 0) {
920 * Look up the root device via devfs so that a dv_node is
921 * created for it. The vnode is never VN_RELE()ed.
922 * We allocate more than MAXPATHLEN so that the
923 * buffer passed to i_ddi_prompath_to_devfspath() is
924 * exactly MAXPATHLEN (the function expects a buffer
927 plen
= strlen("/devices");
928 path
= kmem_alloc(plen
+ MAXPATHLEN
, KM_SLEEP
);
929 (void) strcpy(path
, "/devices");
931 if (i_ddi_prompath_to_devfspath(rootfs
.bo_name
, path
+ plen
)
933 lookupname(path
, UIO_SYSSPACE
, FOLLOW
, NULLVPP
, &rvp
)) {
935 /* NUL terminate in case "path" has garbage */
936 path
[plen
+ MAXPATHLEN
- 1] = '\0';
938 cmn_err(CE_WARN
, "!Cannot lookup root device: %s",
942 kmem_free(path
, plen
+ MAXPATHLEN
);
945 vfs_mnttabvp_setup();
949 * Check to see if our "block device" is actually a file. If so,
950 * automatically add a lofi device, and keep track of this fact.
953 lofi_add(const char *fsname
, struct vfs
*vfsp
,
954 mntopts_t
*mntopts
, struct mounta
*uap
)
956 int fromspace
= (uap
->flags
& MS_SYSSPACE
) ?
957 UIO_SYSSPACE
: UIO_USERSPACE
;
958 struct lofi_ioctl
*li
= NULL
;
959 struct vnode
*vp
= NULL
;
960 struct pathname pn
= { NULL
};
962 ldi_handle_t ldi_hdl
;
967 if ((vfssw
= vfs_getvfssw(fsname
)) == NULL
)
970 if (!(vfssw
->vsw_flag
& VSW_CANLOFI
)) {
971 vfs_unrefvfssw(vfssw
);
975 vfs_unrefvfssw(vfssw
);
978 if (pn_get(uap
->spec
, fromspace
, &pn
) != 0)
981 if (lookupname(uap
->spec
, fromspace
, FOLLOW
, NULL
, &vp
) != 0)
984 if (vp
->v_type
!= VREG
)
987 /* OK, this is a lofi mount. */
989 if ((uap
->flags
& (MS_REMOUNT
|MS_GLOBAL
)) ||
990 vfs_optionisset_nolock(mntopts
, MNTOPT_SUID
, NULL
) ||
991 vfs_optionisset_nolock(mntopts
, MNTOPT_SETUID
, NULL
) ||
992 vfs_optionisset_nolock(mntopts
, MNTOPT_DEVICES
, NULL
)) {
997 ldi_id
= ldi_ident_from_anon();
998 li
= kmem_zalloc(sizeof (*li
), KM_SLEEP
);
999 (void) strlcpy(li
->li_filename
, pn
.pn_path
, MAXPATHLEN
);
1001 err
= ldi_open_by_name("/dev/lofictl", FREAD
| FWRITE
, kcred
,
1007 err
= ldi_ioctl(ldi_hdl
, LOFI_MAP_FILE
, (intptr_t)li
,
1008 FREAD
| FWRITE
| FKIOCTL
, kcred
, &id
);
1010 (void) ldi_close(ldi_hdl
, FREAD
| FWRITE
, kcred
);
1013 vfsp
->vfs_lofi_id
= id
;
1016 ldi_ident_release(ldi_id
);
1019 kmem_free(li
, sizeof (*li
));
1027 lofi_remove(struct vfs
*vfsp
)
1029 struct lofi_ioctl
*li
= NULL
;
1031 ldi_handle_t ldi_hdl
;
1034 if (vfsp
->vfs_lofi_id
== 0)
1037 ldi_id
= ldi_ident_from_anon();
1039 li
= kmem_zalloc(sizeof (*li
), KM_SLEEP
);
1040 li
->li_id
= vfsp
->vfs_lofi_id
;
1041 li
->li_cleanup
= B_TRUE
;
1043 err
= ldi_open_by_name("/dev/lofictl", FREAD
| FWRITE
, kcred
,
1049 err
= ldi_ioctl(ldi_hdl
, LOFI_UNMAP_FILE_MINOR
, (intptr_t)li
,
1050 FREAD
| FWRITE
| FKIOCTL
, kcred
, NULL
);
1052 (void) ldi_close(ldi_hdl
, FREAD
| FWRITE
, kcred
);
1055 vfsp
->vfs_lofi_id
= 0;
1058 ldi_ident_release(ldi_id
);
1060 kmem_free(li
, sizeof (*li
));
1064 * Common mount code. Called from the system call entry point, from autofs,
1065 * nfsv4 trigger mounts, and from pxfs.
1067 * Takes the effective file system type, mount arguments, the mount point
1068 * vnode, flags specifying whether the mount is a remount and whether it
1069 * should be entered into the vfs list, and credentials. Fills in its vfspp
1070 * parameter with the mounted file system instance's vfs.
1072 * Note that the effective file system type is specified as a string. It may
1073 * be null, in which case it's determined from the mount arguments, and may
1074 * differ from the type specified in the mount arguments; this is a hook to
1075 * allow interposition when instantiating file system instances.
1077 * The caller is responsible for releasing its own hold on the mount point
1078 * vp (this routine does its own hold when necessary).
1079 * Also note that for remounts, the mount point vp should be the vnode for
1080 * the root of the file system rather than the vnode that the file system
1081 * is mounted on top of.
1084 domount(char *fsname
, struct mounta
*uap
, vnode_t
*vp
, struct cred
*credp
,
1092 mntopts_t mnt_mntopts
;
1094 int copyout_error
= 0;
1096 char *opts
= uap
->optptr
;
1097 char *inargs
= opts
;
1098 int optlen
= uap
->optlen
;
1104 int splice
= ((uap
->flags
& MS_NOSPLICE
) == 0);
1105 int fromspace
= (uap
->flags
& MS_SYSSPACE
) ?
1106 UIO_SYSSPACE
: UIO_USERSPACE
;
1107 char *resource
= NULL
, *mountpt
= NULL
;
1108 refstr_t
*oldresource
, *oldmntpt
;
1109 struct pathname pn
, rpn
;
1110 vsk_anchor_t
*vskap
;
1111 char fstname
[FSTYPSZ
];
1115 * The v_flag value for the mount point vp is permanently set
1116 * to VVFSLOCK so that no one bypasses the vn_vfs*locks routine
1117 * for mount point locking.
1119 mutex_enter(&vp
->v_lock
);
1120 vp
->v_flag
|= VVFSLOCK
;
1121 mutex_exit(&vp
->v_lock
);
1123 mnt_mntopts
.mo_count
= 0;
1125 * Find the ops vector to use to invoke the file system-specific mount
1126 * method. If the fsname argument is non-NULL, use it directly.
1127 * Otherwise, dig the file system type information out of the mount
1130 * A side effect is to hold the vfssw entry.
1132 * Mount arguments can be specified in several ways, which are
1133 * distinguished by flag bit settings. The preferred way is to set
1134 * MS_OPTIONSTR, indicating an 8 argument mount with the file system
1135 * type supplied as a character string and the last two arguments
1136 * being a pointer to a character buffer and the size of the buffer.
1137 * On entry, the buffer holds a null terminated list of options; on
1138 * return, the string is the list of options the file system
1139 * recognized. If MS_DATA is set arguments five and six point to a
1140 * block of binary data which the file system interprets.
1141 * A further wrinkle is that some callers don't set MS_FSS and MS_DATA
1142 * consistently with these conventions. To handle them, we check to
1143 * see whether the pointer to the file system name has a numeric value
1144 * less than 256. If so, we treat it as an index.
1146 if (fsname
!= NULL
) {
1147 if ((vswp
= vfs_getvfssw(fsname
)) == NULL
) {
1150 } else if (uap
->flags
& (MS_OPTIONSTR
| MS_DATA
| MS_FSS
)) {
1156 if ((fstype
= (uintptr_t)uap
->fstype
) < 256) {
1158 if (fstype
== 0 || fstype
>= nfstype
||
1159 !ALLOCATED_VFSSW(&vfssw
[fstype
])) {
1163 (void) strcpy(fsname
, vfssw
[fstype
].vsw_name
);
1165 if ((vswp
= vfs_getvfssw(fsname
)) == NULL
)
1169 * Handle either kernel or user address space.
1171 if (uap
->flags
& MS_SYSSPACE
) {
1172 error
= copystr(uap
->fstype
, fsname
,
1175 error
= copyinstr(uap
->fstype
, fsname
,
1179 if (error
== ENAMETOOLONG
)
1183 if ((vswp
= vfs_getvfssw(fsname
)) == NULL
)
1187 if ((vswp
= vfs_getvfsswbyvfsops(vfs_getops(rootvfs
))) == NULL
)
1189 fsname
= vswp
->vsw_name
;
1191 if (!VFS_INSTALLED(vswp
))
1194 if ((error
= secpolicy_fs_allowed_mount(fsname
)) != 0) {
1195 vfs_unrefvfssw(vswp
);
1199 vfsops
= &vswp
->vsw_vfsops
;
1201 vfs_copyopttbl(&vswp
->vsw_optproto
, &mnt_mntopts
);
1203 * Fetch mount options and parse them for generic vfs options
1205 if (uap
->flags
& MS_OPTIONSTR
) {
1207 * Limit the buffer size
1209 if (optlen
< 0 || optlen
> MAX_MNTOPT_STR
) {
1213 if ((uap
->flags
& MS_SYSSPACE
) == 0) {
1214 inargs
= kmem_alloc(MAX_MNTOPT_STR
, KM_SLEEP
);
1217 error
= copyinstr(opts
, inargs
, (size_t)optlen
,
1224 vfs_parsemntopts(&mnt_mntopts
, inargs
, 0);
1227 * Flag bits override the options string.
1229 if (uap
->flags
& MS_REMOUNT
)
1230 vfs_setmntopt_nolock(&mnt_mntopts
, MNTOPT_REMOUNT
, NULL
, 0, 0);
1231 if (uap
->flags
& MS_RDONLY
)
1232 vfs_setmntopt_nolock(&mnt_mntopts
, MNTOPT_RO
, NULL
, 0, 0);
1233 if (uap
->flags
& MS_NOSUID
)
1234 vfs_setmntopt_nolock(&mnt_mntopts
, MNTOPT_NOSUID
, NULL
, 0, 0);
1237 * Check if this is a remount; must be set in the option string and
1238 * the file system must support a remount option.
1240 if (remount
= vfs_optionisset_nolock(&mnt_mntopts
,
1241 MNTOPT_REMOUNT
, NULL
)) {
1242 if (!(vswp
->vsw_flag
& VSW_CANREMOUNT
)) {
1246 uap
->flags
|= MS_REMOUNT
;
1250 * uap->flags and vfs_optionisset() should agree.
1252 if (rdonly
= vfs_optionisset_nolock(&mnt_mntopts
, MNTOPT_RO
, NULL
)) {
1253 uap
->flags
|= MS_RDONLY
;
1255 if (vfs_optionisset_nolock(&mnt_mntopts
, MNTOPT_NOSUID
, NULL
)) {
1256 uap
->flags
|= MS_NOSUID
;
1258 nbmand
= vfs_optionisset_nolock(&mnt_mntopts
, MNTOPT_NBMAND
, NULL
);
1259 ASSERT(splice
|| !remount
);
1261 * If we are splicing the fs into the namespace,
1262 * perform mount point checks.
1264 * We want to resolve the path for the mount point to eliminate
1265 * '.' and ".." and symlinks in mount points; we can't do the
1266 * same for the resource string, since it would turn
1267 * "/dev/dsk/c0t0d0s0" into "/devices/pci@...". We need to do
1268 * this before grabbing vn_vfswlock(), because otherwise we
1269 * would deadlock with lookuppn().
1272 ASSERT(vp
->v_count
> 0);
1275 * Pick up mount point and device from appropriate space.
1277 if (pn_get(uap
->spec
, fromspace
, &pn
) == 0) {
1278 resource
= kmem_alloc(pn
.pn_pathlen
+ 1,
1280 (void) strcpy(resource
, pn
.pn_path
);
1284 * Do a lookupname prior to taking the
1285 * writelock. Mark this as completed if
1286 * successful for later cleanup and addition to
1287 * the mount in progress table.
1289 if ((uap
->flags
& MS_GLOBAL
) == 0 &&
1290 lookupname(uap
->spec
, fromspace
,
1291 FOLLOW
, NULL
, &bvp
) == 0) {
1295 if ((error
= pn_get(uap
->dir
, fromspace
, &pn
)) == 0) {
1298 if (*pn
.pn_path
!= '/') {
1305 * Kludge to prevent autofs from deadlocking with
1306 * itself when it calls domount().
1308 * If autofs is calling, it is because it is doing
1309 * (autofs) mounts in the process of an NFS mount. A
1310 * lookuppn() here would cause us to block waiting for
1311 * said NFS mount to complete, which can't since this
1312 * is the thread that was supposed to doing it.
1314 if (fromspace
== UIO_USERSPACE
) {
1315 if ((error
= lookuppn(&pn
, &rpn
, FOLLOW
, NULL
,
1320 * The file disappeared or otherwise
1321 * became inaccessible since we opened
1322 * it; might as well fail the mount
1323 * since the mount point is no longer
1333 mountpt
= kmem_alloc(pnp
->pn_pathlen
+ 1, KM_SLEEP
);
1334 (void) strcpy(mountpt
, pnp
->pn_path
);
1337 * If the addition of the zone's rootpath
1338 * would push us over a total path length
1339 * of MAXPATHLEN, we fail the mount with
1340 * ENAMETOOLONG, which is what we would have
1341 * gotten if we were trying to perform the same
1342 * mount in the global zone.
1344 * strlen() doesn't count the trailing
1345 * '\0', but zone_rootpathlen counts both a
1346 * trailing '/' and the terminating '\0'.
1348 if ((curproc
->p_zone
->zone_rootpathlen
- 1 +
1349 strlen(mountpt
)) > MAXPATHLEN
||
1350 (resource
!= NULL
&&
1351 (curproc
->p_zone
->zone_rootpathlen
- 1 +
1352 strlen(resource
)) > MAXPATHLEN
)) {
1353 error
= ENAMETOOLONG
;
1364 * Prevent path name resolution from proceeding past
1367 if (vn_vfswlock(vp
) != 0) {
1373 * Verify that it's legitimate to establish a mount on
1374 * the prospective mount point.
1376 if (vn_mountedvfs(vp
) != NULL
) {
1378 * The mount point lock was obtained after some
1379 * other thread raced through and established a mount.
1385 if (vp
->v_flag
& VNOMOUNT
) {
1391 if ((uap
->flags
& (MS_DATA
| MS_OPTIONSTR
)) == 0) {
1392 uap
->dataptr
= NULL
;
1397 * If this is a remount, we don't want to create a new VFS.
1398 * Instead, we pass the existing one with a remount flag.
1402 * Confirm that the mount point is the root vnode of the
1403 * file system that is being remounted.
1404 * This can happen if the user specifies a different
1405 * mount point directory pathname in the (re)mount command.
1407 * Code below can only be reached if splice is true, so it's
1408 * safe to do vn_vfsunlock() here.
1410 if ((vp
->v_flag
& VROOT
) == 0) {
1416 * Disallow making file systems read-only unless file system
1417 * explicitly allows it in its vfssw. Ignore other flags.
1419 if (rdonly
&& vn_is_readonly(vp
) == 0 &&
1420 (vswp
->vsw_flag
& VSW_CANRWRO
) == 0) {
1426 * Disallow changing the NBMAND disposition of the file
1427 * system on remounts.
1429 if ((nbmand
&& ((vp
->v_vfsp
->vfs_flag
& VFS_NBMAND
) == 0)) ||
1430 (!nbmand
&& (vp
->v_vfsp
->vfs_flag
& VFS_NBMAND
))) {
1436 ovflags
= vfsp
->vfs_flag
;
1437 vfsp
->vfs_flag
|= VFS_REMOUNT
;
1438 vfsp
->vfs_flag
&= ~VFS_RDONLY
;
1440 vfsp
= vfs_alloc(KM_SLEEP
);
1441 VFS_INIT(vfsp
, vfsops
, NULL
);
1446 if ((error
= lofi_add(fsname
, vfsp
, &mnt_mntopts
, uap
)) != 0) {
1459 * PRIV_SYS_MOUNT doesn't mean you can become root.
1461 if (vfsp
->vfs_lofi_id
!= 0) {
1462 uap
->flags
|= MS_NOSUID
;
1463 vfs_setmntopt_nolock(&mnt_mntopts
, MNTOPT_NOSUID
, NULL
, 0, 0);
1467 * The vfs_reflock is not used anymore the code below explicitly
1468 * holds it preventing others accesing it directly.
1470 if ((sema_tryp(&vfsp
->vfs_reflock
) == 0) &&
1471 !(vfsp
->vfs_flag
& VFS_REMOUNT
))
1473 "mount type %s couldn't get vfs_reflock", vswp
->vsw_name
);
1476 * Lock the vfs. If this is a remount we want to avoid spurious umount
1477 * failures that happen as a side-effect of fsflush() and other mount
1478 * and unmount operations that might be going on simultaneously and
1479 * may have locked the vfs currently. To not return EBUSY immediately
1480 * here we use vfs_lock_wait() instead vfs_lock() for the remount case.
1483 if (error
= vfs_lock(vfsp
)) {
1484 vfsp
->vfs_flag
= ovflags
;
1494 vfs_lock_wait(vfsp
);
1498 * Add device to mount in progress table, global mounts require special
1499 * handling. It is possible that we have already done the lookupname
1500 * on a spliced, non-global fs. If so, we don't want to do it again
1501 * since we cannot do a lookupname after taking the
1502 * wlock above. This case is for a non-spliced, non-global filesystem.
1505 if ((uap
->flags
& MS_GLOBAL
) == 0 &&
1506 lookupname(uap
->spec
, fromspace
, FOLLOW
, NULL
, &bvp
) == 0) {
1512 vnode_t
*lvp
= NULL
;
1514 error
= vfs_get_lofi(vfsp
, &lvp
);
1529 } else if (error
== -1) {
1538 vfs_addmip(bdev
, vfsp
);
1543 * Invalidate cached entry for the mount point.
1549 * If have an option string but the filesystem doesn't supply a
1550 * prototype options table, create a table with the global
1551 * options and sufficient room to accept all the options in the
1552 * string. Then parse the passed in option string
1553 * accepting all the options in the string. This gives us an
1554 * option table with all the proper cancel properties for the
1557 * Filesystems that supply a prototype options table are handled
1558 * earlier in this function.
1560 if (uap
->flags
& MS_OPTIONSTR
) {
1561 if (!(vswp
->vsw_flag
& VSW_HASPROTO
)) {
1562 mntopts_t tmp_mntopts
;
1564 tmp_mntopts
.mo_count
= 0;
1565 vfs_createopttbl_extend(&tmp_mntopts
, inargs
,
1567 vfs_parsemntopts(&tmp_mntopts
, inargs
, 1);
1568 vfs_swapopttbl_nolock(&mnt_mntopts
, &tmp_mntopts
);
1569 vfs_freeopttbl(&tmp_mntopts
);
1574 * Serialize with zone state transitions.
1575 * See vfs_list_add; zone mounted into is:
1576 * zone_find_by_path(refstr_value(vfsp->vfs_mntpt))
1577 * not the zone doing the mount (curproc->p_zone), but if we're already
1578 * inside a NGZ, then we know what zone we are.
1580 if (INGLOBALZONE(curproc
)) {
1581 zone
= zone_find_by_path(mountpt
);
1582 ASSERT(zone
!= NULL
);
1584 zone
= curproc
->p_zone
;
1586 * zone_find_by_path does a hold, so do one here too so that
1587 * we can do a zone_rele after mount_completed.
1591 mount_in_progress(zone
);
1593 * Instantiate (or reinstantiate) the file system. If appropriate,
1594 * splice it into the file system name space.
1596 * We want VFS_MOUNT() to be able to override the vfs_resource
1597 * string if necessary (ie, mntfs), and also for a remount to
1598 * change the same (necessary when remounting '/' during boot).
1599 * So we set up vfs_mntpt and vfs_resource to what we think they
1600 * should be, then hand off control to VFS_MOUNT() which can
1603 * For safety's sake, when changing vfs_resource or vfs_mntpt of
1604 * a vfs which is on the vfs list (i.e. during a remount), we must
1605 * never set those fields to NULL. Several bits of code make
1606 * assumptions that the fields are always valid.
1608 vfs_swapopttbl(&mnt_mntopts
, &vfsp
->vfs_mntopts
);
1610 if ((oldresource
= vfsp
->vfs_resource
) != NULL
)
1611 refstr_hold(oldresource
);
1612 if ((oldmntpt
= vfsp
->vfs_mntpt
) != NULL
)
1613 refstr_hold(oldmntpt
);
1615 vfs_setresource(vfsp
, resource
, 0);
1616 vfs_setmntpoint(vfsp
, mountpt
, 0);
1619 * going to mount on this vnode, so notify.
1621 vnevent_mountedover(vp
, NULL
);
1622 error
= VFS_MOUNT(vfsp
, vp
, uap
, credp
);
1624 if (uap
->flags
& MS_RDONLY
)
1625 vfs_setmntopt(vfsp
, MNTOPT_RO
, NULL
, 0);
1626 if (uap
->flags
& MS_NOSUID
)
1627 vfs_setmntopt(vfsp
, MNTOPT_NOSUID
, NULL
, 0);
1628 if (uap
->flags
& MS_GLOBAL
)
1629 vfs_setmntopt(vfsp
, MNTOPT_GLOBAL
, NULL
, 0);
1635 /* put back pre-remount options */
1636 vfs_swapopttbl(&mnt_mntopts
, &vfsp
->vfs_mntopts
);
1637 vfs_setmntpoint(vfsp
, refstr_value(oldmntpt
),
1640 refstr_rele(oldmntpt
);
1641 vfs_setresource(vfsp
, refstr_value(oldresource
),
1644 refstr_rele(oldresource
);
1645 vfsp
->vfs_flag
= ovflags
;
1650 vfs_freemnttab(vfsp
);
1655 * Set the mount time to now
1657 vfsp
->vfs_mtime
= ddi_get_time();
1659 vfsp
->vfs_flag
&= ~VFS_REMOUNT
;
1661 refstr_rele(oldresource
);
1663 refstr_rele(oldmntpt
);
1664 } else if (splice
) {
1666 * Link vfsp into the name space at the mount
1667 * point. Vfs_add() is responsible for
1668 * holding the mount point which will be
1669 * released when vfs_remove() is called.
1671 vfs_add(vp
, vfsp
, uap
->flags
);
1674 * Hold the reference to file system which is
1675 * not linked into the name space.
1677 vfsp
->vfs_zone
= NULL
;
1679 vfsp
->vfs_vnodecovered
= NULL
;
1682 * Set flags for global options encountered
1684 if (vfs_optionisset(vfsp
, MNTOPT_RO
, NULL
))
1685 vfsp
->vfs_flag
|= VFS_RDONLY
;
1687 vfsp
->vfs_flag
&= ~VFS_RDONLY
;
1688 if (vfs_optionisset(vfsp
, MNTOPT_NOSUID
, NULL
)) {
1689 vfsp
->vfs_flag
|= (VFS_NOSETUID
|VFS_NODEVICES
);
1691 if (vfs_optionisset(vfsp
, MNTOPT_NODEVICES
, NULL
))
1692 vfsp
->vfs_flag
|= VFS_NODEVICES
;
1694 vfsp
->vfs_flag
&= ~VFS_NODEVICES
;
1695 if (vfs_optionisset(vfsp
, MNTOPT_NOSETUID
, NULL
))
1696 vfsp
->vfs_flag
|= VFS_NOSETUID
;
1698 vfsp
->vfs_flag
&= ~VFS_NOSETUID
;
1700 if (vfs_optionisset(vfsp
, MNTOPT_NBMAND
, NULL
))
1701 vfsp
->vfs_flag
|= VFS_NBMAND
;
1703 vfsp
->vfs_flag
&= ~VFS_NBMAND
;
1705 if (vfs_optionisset(vfsp
, MNTOPT_XATTR
, NULL
))
1706 vfsp
->vfs_flag
|= VFS_XATTR
;
1708 vfsp
->vfs_flag
&= ~VFS_XATTR
;
1710 if (vfs_optionisset(vfsp
, MNTOPT_NOEXEC
, NULL
))
1711 vfsp
->vfs_flag
|= VFS_NOEXEC
;
1713 vfsp
->vfs_flag
&= ~VFS_NOEXEC
;
1716 * Now construct the output option string of options
1719 if (uap
->flags
& MS_OPTIONSTR
) {
1720 vfs_list_read_lock();
1721 copyout_error
= vfs_buildoptionstr(
1722 &vfsp
->vfs_mntopts
, inargs
, optlen
);
1724 if (copyout_error
== 0 &&
1725 (uap
->flags
& MS_SYSSPACE
) == 0) {
1726 copyout_error
= copyoutstr(inargs
, opts
,
1732 * If this isn't a remount, set up the vopstats before
1733 * anyone can touch this. We only allow spliced file
1734 * systems (file systems which are in the namespace) to
1735 * have the VFS_STATS flag set.
1736 * NOTE: PxFS mounts the underlying file system with
1737 * MS_NOSPLICE set and copies those vfs_flags to its private
1738 * vfs structure. As a result, PxFS should never have
1739 * the VFS_STATS flag or else we might access the vfs
1740 * statistics-related fields prior to them being
1741 * properly initialized.
1743 if (!remount
&& (vswp
->vsw_flag
& VSW_STATS
) && splice
) {
1744 initialize_vopstats(&vfsp
->vfs_vopstats
);
1746 * We need to set vfs_vskap to NULL because there's
1747 * a chance it won't be set below. This is checked
1748 * in teardown_vopstats() so we can't have garbage.
1750 vfsp
->vfs_vskap
= NULL
;
1751 vfsp
->vfs_flag
|= VFS_STATS
;
1752 vfsp
->vfs_fstypevsp
= get_fstype_vopstats(vfsp
, vswp
);
1755 if (vswp
->vsw_flag
& VSW_XID
)
1756 vfsp
->vfs_flag
|= VFS_XID
;
1760 mount_completed(zone
);
1765 if ((error
== 0) && (copyout_error
== 0)) {
1768 * Don't call get_vskstat_anchor() while holding
1769 * locks since it allocates memory and calls
1770 * VFS_STATVFS(). For NFS, the latter can generate
1771 * an over-the-wire call.
1773 vskap
= get_vskstat_anchor(vfsp
);
1774 /* Only take the lock if we have something to do */
1775 if (vskap
!= NULL
) {
1776 vfs_lock_wait(vfsp
);
1777 if (vfsp
->vfs_flag
& VFS_STATS
) {
1778 vfsp
->vfs_vskap
= vskap
;
1783 /* Return vfsp to caller. */
1787 vfs_freeopttbl(&mnt_mntopts
);
1788 if (resource
!= NULL
)
1789 kmem_free(resource
, strlen(resource
) + 1);
1790 if (mountpt
!= NULL
)
1791 kmem_free(mountpt
, strlen(mountpt
) + 1);
1793 * It is possible we errored prior to adding to mount in progress
1794 * table. Must free vnode we acquired with successful lookupname.
1800 ASSERT(vswp
!= NULL
);
1801 vfs_unrefvfssw(vswp
);
1803 kmem_free(inargs
, MAX_MNTOPT_STR
);
1804 if (copyout_error
) {
1807 error
= copyout_error
;
1814 struct vfs
*vfsp
, /* vfs being updated */
1815 refstr_t
**refp
, /* Ref-count string to contain the new path */
1816 const char *newpath
, /* Path to add to refp (above) */
1817 uint32_t flag
) /* flag */
1821 zone_t
*zone
= curproc
->p_zone
;
1823 int have_list_lock
= 0;
1825 ASSERT(!VFS_ON_LIST(vfsp
) || vfs_lock_held(vfsp
));
1828 * New path must be less than MAXPATHLEN because mntfs
1829 * will only display up to MAXPATHLEN bytes. This is currently
1830 * safe, because domount() uses pn_get(), and other callers
1831 * similarly cap the size to fewer than MAXPATHLEN bytes.
1834 ASSERT(strlen(newpath
) < MAXPATHLEN
);
1836 /* mntfs requires consistency while vfs list lock is held */
1838 if (VFS_ON_LIST(vfsp
)) {
1847 * If we are in a non-global zone then we prefix the supplied path,
1848 * newpath, with the zone's root path, with two exceptions. The first
1849 * is where we have been explicitly directed to avoid doing so; this
1850 * will be the case following a failed remount, where the path supplied
1851 * will be a saved version which must now be restored. The second
1852 * exception is where newpath is not a pathname but a descriptive name,
1855 if (zone
== global_zone
|| (flag
& VFSSP_VERBATIM
) || *newpath
!= '/') {
1856 ref
= refstr_alloc(newpath
);
1861 * Truncate the trailing '/' in the zoneroot, and merge
1862 * in the zone's rootpath with the "newpath" (resource
1863 * or mountpoint) passed in.
1865 * The size of the required buffer is thus the size of
1866 * the buffer required for the passed-in newpath
1867 * (strlen(newpath) + 1), plus the size of the buffer
1868 * required to hold zone_rootpath (zone_rootpathlen)
1869 * minus one for one of the now-superfluous NUL
1870 * terminations, minus one for the trailing '/'.
1874 * (strlen(newpath) + 1) + zone_rootpathlen - 1 - 1
1876 * Which is what we have below.
1879 len
= strlen(newpath
) + zone
->zone_rootpathlen
- 1;
1880 sp
= kmem_alloc(len
, KM_SLEEP
);
1883 * Copy everything including the trailing slash, which
1884 * we then overwrite with the NUL character.
1887 (void) strcpy(sp
, zone
->zone_rootpath
);
1888 sp
[zone
->zone_rootpathlen
- 2] = '\0';
1889 (void) strcat(sp
, newpath
);
1891 ref
= refstr_alloc(sp
);
1896 if (have_list_lock
) {
1897 vfs_mnttab_modtimeupd();
1903 * Record a mounted resource name in a vfs structure.
1904 * If vfsp is already mounted, caller must hold the vfs lock.
1907 vfs_setresource(struct vfs
*vfsp
, const char *resource
, uint32_t flag
)
1909 if (resource
== NULL
|| resource
[0] == '\0')
1910 resource
= VFS_NORESOURCE
;
1911 vfs_setpath(vfsp
, &vfsp
->vfs_resource
, resource
, flag
);
1915 * Record a mount point name in a vfs structure.
1916 * If vfsp is already mounted, caller must hold the vfs lock.
1919 vfs_setmntpoint(struct vfs
*vfsp
, const char *mntpt
, uint32_t flag
)
1921 if (mntpt
== NULL
|| mntpt
[0] == '\0')
1922 mntpt
= VFS_NOMNTPT
;
1923 vfs_setpath(vfsp
, &vfsp
->vfs_mntpt
, mntpt
, flag
);
1926 /* Returns the vfs_resource. Caller must call refstr_rele() when finished. */
1929 vfs_getresource(const struct vfs
*vfsp
)
1933 vfs_list_read_lock();
1934 resource
= vfsp
->vfs_resource
;
1935 refstr_hold(resource
);
1941 /* Returns the vfs_mntpt. Caller must call refstr_rele() when finished. */
1944 vfs_getmntpoint(const struct vfs
*vfsp
)
1948 vfs_list_read_lock();
1949 mntpt
= vfsp
->vfs_mntpt
;
1957 * Create an empty options table with enough empty slots to hold all
1958 * The options in the options string passed as an argument.
1959 * Potentially prepend another options table.
1961 * Note: caller is responsible for locking the vfs list, if needed,
1965 vfs_createopttbl_extend(mntopts_t
*mops
, const char *opts
,
1966 const mntopts_t
*mtmpl
)
1968 const char *s
= opts
;
1971 if (opts
== NULL
|| *opts
== '\0') {
1977 * Count number of options in the string
1979 for (s
= strchr(s
, ','); s
!= NULL
; s
= strchr(s
, ',')) {
1984 vfs_copyopttbl_extend(mtmpl
, mops
, count
);
1988 * Create an empty options table with enough empty slots to hold all
1989 * The options in the options string passed as an argument.
1991 * This function is *not* for general use by filesystems.
1993 * Note: caller is responsible for locking the vfs list, if needed,
1997 vfs_createopttbl(mntopts_t
*mops
, const char *opts
)
1999 vfs_createopttbl_extend(mops
, opts
, NULL
);
2004 * Swap two mount options tables
2007 vfs_swapopttbl_nolock(mntopts_t
*optbl1
, mntopts_t
*optbl2
)
2012 tmpcnt
= optbl2
->mo_count
;
2013 tmplist
= optbl2
->mo_list
;
2014 optbl2
->mo_count
= optbl1
->mo_count
;
2015 optbl2
->mo_list
= optbl1
->mo_list
;
2016 optbl1
->mo_count
= tmpcnt
;
2017 optbl1
->mo_list
= tmplist
;
2021 vfs_swapopttbl(mntopts_t
*optbl1
, mntopts_t
*optbl2
)
2024 vfs_swapopttbl_nolock(optbl1
, optbl2
);
2025 vfs_mnttab_modtimeupd();
2030 vfs_copycancelopt_extend(char **const moc
, int extend
)
2037 for (; moc
[i
] != NULL
; i
++)
2038 /* count number of options to cancel */;
2041 if (i
+ extend
== 0)
2044 result
= kmem_alloc((i
+ extend
+ 1) * sizeof (char *), KM_SLEEP
);
2046 for (j
= 0; j
< i
; j
++) {
2047 result
[j
] = kmem_alloc(strlen(moc
[j
]) + 1, KM_SLEEP
);
2048 (void) strcpy(result
[j
], moc
[j
]);
2050 for (; j
<= i
+ extend
; j
++)
2057 vfs_copyopt(const mntopt_t
*s
, mntopt_t
*d
)
2061 d
->mo_flags
= s
->mo_flags
;
2062 d
->mo_data
= s
->mo_data
;
2065 dp
= kmem_alloc(strlen(sp
) + 1, KM_SLEEP
);
2066 (void) strcpy(dp
, sp
);
2069 d
->mo_name
= NULL
; /* should never happen */
2072 d
->mo_cancel
= vfs_copycancelopt_extend(s
->mo_cancel
, 0);
2076 dp
= kmem_alloc(strlen(sp
) + 1, KM_SLEEP
);
2077 (void) strcpy(dp
, sp
);
2085 * Copy a mount options table, possibly allocating some spare
2086 * slots at the end. It is permissible to copy_extend the NULL table.
2089 vfs_copyopttbl_extend(const mntopts_t
*smo
, mntopts_t
*dmo
, int extra
)
2095 * Clear out any existing stuff in the options table being initialized
2097 vfs_freeopttbl(dmo
);
2098 count
= (smo
== NULL
) ? 0 : smo
->mo_count
;
2099 if ((count
+ extra
) == 0) /* nothing to do */
2101 dmo
->mo_count
= count
+ extra
;
2102 motbl
= kmem_zalloc((count
+ extra
) * sizeof (mntopt_t
), KM_SLEEP
);
2103 dmo
->mo_list
= motbl
;
2104 for (i
= 0; i
< count
; i
++) {
2105 vfs_copyopt(&smo
->mo_list
[i
], &motbl
[i
]);
2107 for (i
= count
; i
< count
+ extra
; i
++) {
2108 motbl
[i
].mo_flags
= MO_EMPTY
;
2113 * Copy a mount options table.
2115 * This function is *not* for general use by filesystems.
2117 * Note: caller is responsible for locking the vfs list, if needed,
2118 * to protect smo and dmo.
2121 vfs_copyopttbl(const mntopts_t
*smo
, mntopts_t
*dmo
)
2123 vfs_copyopttbl_extend(smo
, dmo
, 0);
2127 vfs_mergecancelopts(const mntopt_t
*mop1
, const mntopt_t
*mop2
)
2132 char **sp1
, **sp2
, **dp
;
2135 * First we count both lists of cancel options.
2136 * If either is NULL or has no elements, we return a copy of
2139 if (mop1
->mo_cancel
!= NULL
) {
2140 for (; mop1
->mo_cancel
[c1
] != NULL
; c1
++)
2141 /* count cancel options in mop1 */;
2145 return (vfs_copycancelopt_extend(mop2
->mo_cancel
, 0));
2147 if (mop2
->mo_cancel
!= NULL
) {
2148 for (; mop2
->mo_cancel
[c2
] != NULL
; c2
++)
2149 /* count cancel options in mop2 */;
2152 result
= vfs_copycancelopt_extend(mop1
->mo_cancel
, c2
);
2158 * When we get here, we've got two sets of cancel options;
2159 * we need to merge the two sets. We know that the result
2160 * array has "c1+c2+1" entries and in the end we might shrink
2162 * Result now has a copy of the c1 entries from mop1; we'll
2163 * now lookup all the entries of mop2 in mop1 and copy it if
2165 * This operation is O(n^2) but it's only called once per
2166 * filesystem per duplicate option. This is a situation
2167 * which doesn't arise with the filesystems in ON and
2172 for (sp2
= mop2
->mo_cancel
; *sp2
!= NULL
; sp2
++) {
2173 for (sp1
= mop1
->mo_cancel
; *sp1
!= NULL
; sp1
++) {
2174 if (strcmp(*sp1
, *sp2
) == 0)
2179 * Option *sp2 not found in mop1, so copy it.
2180 * The calls to vfs_copycancelopt_extend()
2181 * guarantee that there's enough room.
2183 *dp
= kmem_alloc(strlen(*sp2
) + 1, KM_SLEEP
);
2184 (void) strcpy(*dp
++, *sp2
);
2187 if (dp
!= &result
[c1
+c2
]) {
2188 size_t bytes
= (dp
- result
+ 1) * sizeof (char *);
2189 char **nres
= kmem_alloc(bytes
, KM_SLEEP
);
2191 bcopy(result
, nres
, bytes
);
2192 kmem_free(result
, (c1
+ c2
+ 1) * sizeof (char *));
2199 * Merge two mount option tables (outer and inner) into one. This is very
2200 * similar to "merging" global variables and automatic variables in C.
2202 * This isn't (and doesn't have to be) fast.
2204 * This function is *not* for general use by filesystems.
2206 * Note: caller is responsible for locking the vfs list, if needed,
2207 * to protect omo, imo & dmo.
2210 vfs_mergeopttbl(const mntopts_t
*omo
, const mntopts_t
*imo
, mntopts_t
*dmo
)
2213 mntopt_t
*mop
, *motbl
;
2217 * First determine how much space we need to allocate.
2219 count
= omo
->mo_count
;
2220 for (i
= 0; i
< imo
->mo_count
; i
++) {
2221 if (imo
->mo_list
[i
].mo_flags
& MO_EMPTY
)
2223 if (vfs_hasopt(omo
, imo
->mo_list
[i
].mo_name
) == NULL
)
2226 ASSERT(count
>= omo
->mo_count
&&
2227 count
<= omo
->mo_count
+ imo
->mo_count
);
2228 motbl
= kmem_alloc(count
* sizeof (mntopt_t
), KM_SLEEP
);
2229 for (i
= 0; i
< omo
->mo_count
; i
++)
2230 vfs_copyopt(&omo
->mo_list
[i
], &motbl
[i
]);
2231 freeidx
= omo
->mo_count
;
2232 for (i
= 0; i
< imo
->mo_count
; i
++) {
2233 if (imo
->mo_list
[i
].mo_flags
& MO_EMPTY
)
2235 if ((mop
= vfs_hasopt(omo
, imo
->mo_list
[i
].mo_name
)) != NULL
) {
2237 uint_t index
= mop
- omo
->mo_list
;
2239 newcanp
= vfs_mergecancelopts(mop
, &motbl
[index
]);
2241 vfs_freeopt(&motbl
[index
]);
2242 vfs_copyopt(&imo
->mo_list
[i
], &motbl
[index
]);
2244 vfs_freecancelopt(motbl
[index
].mo_cancel
);
2245 motbl
[index
].mo_cancel
= newcanp
;
2248 * If it's a new option, just copy it over to the first
2251 vfs_copyopt(&imo
->mo_list
[i
], &motbl
[freeidx
++]);
2254 dmo
->mo_count
= count
;
2255 dmo
->mo_list
= motbl
;
2259 * Functions to set and clear mount options in a mount options table.
2263 * Clear a mount option, if it exists.
2265 * The update_mnttab arg indicates whether mops is part of a vfs that is on
2269 vfs_clearmntopt_nolock(mntopts_t
*mops
, const char *opt
, int update_mnttab
)
2274 ASSERT(!update_mnttab
|| RW_WRITE_HELD(&vfslist
));
2276 count
= mops
->mo_count
;
2277 for (i
= 0; i
< count
; i
++) {
2278 mop
= &mops
->mo_list
[i
];
2280 if (mop
->mo_flags
& MO_EMPTY
)
2282 if (strcmp(opt
, mop
->mo_name
))
2284 mop
->mo_flags
&= ~MO_SET
;
2285 if (mop
->mo_arg
!= NULL
) {
2286 kmem_free(mop
->mo_arg
, strlen(mop
->mo_arg
) + 1);
2290 vfs_mnttab_modtimeupd();
2296 vfs_clearmntopt(struct vfs
*vfsp
, const char *opt
)
2300 if (VFS_ON_LIST(vfsp
)) {
2304 vfs_clearmntopt_nolock(&vfsp
->vfs_mntopts
, opt
, gotlock
);
2311 * Set a mount option on. If it's not found in the table, it's silently
2312 * ignored. If the option has MO_IGNORE set, it is still set unless the
2313 * VFS_NOFORCEOPT bit is set in the flags. Also, VFS_DISPLAY/VFS_NODISPLAY flag
2314 * bits can be used to toggle the MO_NODISPLAY bit for the option.
2315 * If the VFS_CREATEOPT flag bit is set then the first option slot with
2316 * MO_EMPTY set is created as the option passed in.
2318 * The update_mnttab arg indicates whether mops is part of a vfs that is on
2322 vfs_setmntopt_nolock(mntopts_t
*mops
, const char *opt
,
2323 const char *arg
, int flags
, int update_mnttab
)
2329 ASSERT(!update_mnttab
|| RW_WRITE_HELD(&vfslist
));
2331 if (flags
& VFS_CREATEOPT
) {
2332 if (vfs_hasopt(mops
, opt
) != NULL
) {
2333 flags
&= ~VFS_CREATEOPT
;
2336 count
= mops
->mo_count
;
2337 for (i
= 0; i
< count
; i
++) {
2338 mop
= &mops
->mo_list
[i
];
2340 if (mop
->mo_flags
& MO_EMPTY
) {
2341 if ((flags
& VFS_CREATEOPT
) == 0)
2343 sp
= kmem_alloc(strlen(opt
) + 1, KM_SLEEP
);
2344 (void) strcpy(sp
, opt
);
2347 mop
->mo_flags
= MO_HASVALUE
;
2350 } else if (strcmp(opt
, mop
->mo_name
)) {
2353 if ((mop
->mo_flags
& MO_IGNORE
) && (flags
& VFS_NOFORCEOPT
))
2355 if (arg
!= NULL
&& (mop
->mo_flags
& MO_HASVALUE
) != 0) {
2356 sp
= kmem_alloc(strlen(arg
) + 1, KM_SLEEP
);
2357 (void) strcpy(sp
, arg
);
2361 if (mop
->mo_arg
!= NULL
)
2362 kmem_free(mop
->mo_arg
, strlen(mop
->mo_arg
) + 1);
2364 if (flags
& VFS_DISPLAY
)
2365 mop
->mo_flags
&= ~MO_NODISPLAY
;
2366 if (flags
& VFS_NODISPLAY
)
2367 mop
->mo_flags
|= MO_NODISPLAY
;
2368 mop
->mo_flags
|= MO_SET
;
2369 if (mop
->mo_cancel
!= NULL
) {
2372 for (cp
= mop
->mo_cancel
; *cp
!= NULL
; cp
++)
2373 vfs_clearmntopt_nolock(mops
, *cp
, 0);
2376 vfs_mnttab_modtimeupd();
2382 vfs_setmntopt(struct vfs
*vfsp
, const char *opt
, const char *arg
, int flags
)
2386 if (VFS_ON_LIST(vfsp
)) {
2390 vfs_setmntopt_nolock(&vfsp
->vfs_mntopts
, opt
, arg
, flags
, gotlock
);
2397 * Add a "tag" option to a mounted file system's options list.
2399 * Note: caller is responsible for locking the vfs list, if needed,
2403 vfs_addtag(mntopts_t
*mops
, const char *tag
)
2406 mntopt_t
*mop
, *motbl
;
2408 count
= mops
->mo_count
+ 1;
2409 motbl
= kmem_zalloc(count
* sizeof (mntopt_t
), KM_SLEEP
);
2410 if (mops
->mo_count
) {
2411 size_t len
= (count
- 1) * sizeof (mntopt_t
);
2413 bcopy(mops
->mo_list
, motbl
, len
);
2414 kmem_free(mops
->mo_list
, len
);
2416 mops
->mo_count
= count
;
2417 mops
->mo_list
= motbl
;
2418 mop
= &motbl
[count
- 1];
2419 mop
->mo_flags
= MO_TAG
;
2420 mop
->mo_name
= kmem_alloc(strlen(tag
) + 1, KM_SLEEP
);
2421 (void) strcpy(mop
->mo_name
, tag
);
2426 * Allow users to set arbitrary "tags" in a vfs's mount options.
2427 * Broader use within the kernel is discouraged.
2430 vfs_settag(uint_t major
, uint_t minor
, const char *mntpt
, const char *tag
,
2437 dev_t dev
= makedevice(major
, minor
);
2439 char *buf
= kmem_alloc(MAX_MNTOPT_STR
, KM_SLEEP
);
2442 * Find the desired mounted file system
2447 if (vfsp
->vfs_dev
== dev
&&
2448 strcmp(mntpt
, refstr_value(vfsp
->vfs_mntpt
)) == 0) {
2452 vfsp
= vfsp
->vfs_next
;
2453 } while (vfsp
!= rootvfs
);
2459 err
= secpolicy_fs_config(cr
, vfsp
);
2463 mops
= &vfsp
->vfs_mntopts
;
2465 * Add tag if it doesn't already exist
2467 if ((mop
= vfs_hasopt(mops
, tag
)) == NULL
) {
2470 (void) vfs_buildoptionstr(mops
, buf
, MAX_MNTOPT_STR
);
2472 if (len
+ strlen(tag
) + 2 > MAX_MNTOPT_STR
) {
2476 mop
= vfs_addtag(mops
, tag
);
2478 if ((mop
->mo_flags
& MO_TAG
) == 0) {
2482 vfs_setmntopt_nolock(mops
, tag
, NULL
, 0, 1);
2485 kmem_free(buf
, MAX_MNTOPT_STR
);
2490 * Allow users to remove arbitrary "tags" in a vfs's mount options.
2491 * Broader use within the kernel is discouraged.
2494 vfs_clrtag(uint_t major
, uint_t minor
, const char *mntpt
, const char *tag
,
2500 dev_t dev
= makedevice(major
, minor
);
2504 * Find the desired mounted file system
2509 if (vfsp
->vfs_dev
== dev
&&
2510 strcmp(mntpt
, refstr_value(vfsp
->vfs_mntpt
)) == 0) {
2514 vfsp
= vfsp
->vfs_next
;
2515 } while (vfsp
!= rootvfs
);
2521 err
= secpolicy_fs_config(cr
, vfsp
);
2525 if ((mop
= vfs_hasopt(&vfsp
->vfs_mntopts
, tag
)) == NULL
) {
2529 if ((mop
->mo_flags
& MO_TAG
) == 0) {
2533 vfs_clearmntopt_nolock(&vfsp
->vfs_mntopts
, tag
, 1);
2540 * Function to parse an option string and fill in a mount options table.
2541 * Unknown options are silently ignored. The input option string is modified
2542 * by replacing separators with nulls. If the create flag is set, options
2543 * not found in the table are just added on the fly. The table must have
2544 * an option slot marked MO_EMPTY to add an option on the fly.
2546 * This function is *not* for general use by filesystems.
2548 * Note: caller is responsible for locking the vfs list, if needed,
2552 vfs_parsemntopts(mntopts_t
*mops
, char *osp
, int create
)
2554 char *s
= osp
, *p
, *nextop
, *valp
, *cp
, *ep
;
2555 int setflg
= VFS_NOFORCEOPT
;
2559 while (*s
!= '\0') {
2560 p
= strchr(s
, ','); /* find next option */
2565 cp
= p
; /* save location of comma */
2566 *p
++ = '\0'; /* mark end and point to next option */
2569 p
= strchr(s
, '='); /* look for value */
2571 valp
= NULL
; /* no value supplied */
2573 ep
= p
; /* save location of equals */
2574 *p
++ = '\0'; /* end option and point to value */
2578 * set option into options table
2581 setflg
|= VFS_CREATEOPT
;
2582 vfs_setmntopt_nolock(mops
, s
, valp
, setflg
, 0);
2584 *cp
= ','; /* restore the comma */
2586 *ep
= '='; /* restore the equals */
2592 * Function to inquire if an option exists in a mount options table.
2593 * Returns a pointer to the option if it exists, else NULL.
2595 * This function is *not* for general use by filesystems.
2597 * Note: caller is responsible for locking the vfs list, if needed,
2601 vfs_hasopt(const mntopts_t
*mops
, const char *opt
)
2606 count
= mops
->mo_count
;
2607 for (i
= 0; i
< count
; i
++) {
2608 mop
= &mops
->mo_list
[i
];
2610 if (mop
->mo_flags
& MO_EMPTY
)
2612 if (strcmp(opt
, mop
->mo_name
) == 0)
2619 * Function to inquire if an option is set in a mount options table.
2620 * Returns non-zero if set and fills in the arg pointer with a pointer to
2621 * the argument string or NULL if there is no argument string.
2624 vfs_optionisset_nolock(const mntopts_t
*mops
, const char *opt
, char **argp
)
2629 count
= mops
->mo_count
;
2630 for (i
= 0; i
< count
; i
++) {
2631 mop
= &mops
->mo_list
[i
];
2633 if (mop
->mo_flags
& MO_EMPTY
)
2635 if (strcmp(opt
, mop
->mo_name
))
2637 if ((mop
->mo_flags
& MO_SET
) == 0)
2639 if (argp
!= NULL
&& (mop
->mo_flags
& MO_HASVALUE
) != 0)
2640 *argp
= mop
->mo_arg
;
2648 vfs_optionisset(const struct vfs
*vfsp
, const char *opt
, char **argp
)
2652 vfs_list_read_lock();
2653 ret
= vfs_optionisset_nolock(&vfsp
->vfs_mntopts
, opt
, argp
);
2660 * Construct a comma separated string of the options set in the given
2661 * mount table, return the string in the given buffer. Return non-zero if
2662 * the buffer would overflow.
2664 * This function is *not* for general use by filesystems.
2666 * Note: caller is responsible for locking the vfs list, if needed,
2670 vfs_buildoptionstr(const mntopts_t
*mp
, char *buf
, int len
)
2677 for (i
= 0; i
< mp
->mo_count
; i
++) {
2680 mop
= &mp
->mo_list
[i
];
2681 if (mop
->mo_flags
& MO_SET
) {
2682 int optlen
, comma
= 0;
2686 optlen
= strlen(mop
->mo_name
);
2687 if (strlen(buf
) + comma
+ optlen
+ 1 > len
)
2691 (void) strcpy(cp
, mop
->mo_name
);
2694 * Append option value if there is one
2696 if (mop
->mo_arg
!= NULL
) {
2699 arglen
= strlen(mop
->mo_arg
);
2700 if (strlen(buf
) + arglen
+ 2 > len
)
2703 (void) strcpy(cp
, mop
->mo_arg
);
2714 vfs_freecancelopt(char **moc
)
2720 for (cp
= moc
; *cp
!= NULL
; cp
++) {
2721 kmem_free(*cp
, strlen(*cp
) + 1);
2724 kmem_free(moc
, (ccnt
+ 1) * sizeof (char *));
2729 vfs_freeopt(mntopt_t
*mop
)
2731 if (mop
->mo_name
!= NULL
)
2732 kmem_free(mop
->mo_name
, strlen(mop
->mo_name
) + 1);
2734 vfs_freecancelopt(mop
->mo_cancel
);
2736 if (mop
->mo_arg
!= NULL
)
2737 kmem_free(mop
->mo_arg
, strlen(mop
->mo_arg
) + 1);
2741 * Free a mount options table
2743 * This function is *not* for general use by filesystems.
2745 * Note: caller is responsible for locking the vfs list, if needed,
2749 vfs_freeopttbl(mntopts_t
*mp
)
2753 count
= mp
->mo_count
;
2754 for (i
= 0; i
< count
; i
++) {
2755 vfs_freeopt(&mp
->mo_list
[i
]);
2758 kmem_free(mp
->mo_list
, sizeof (mntopt_t
) * count
);
2767 vfs_mntdummyread(vnode_t
*vp
, uio_t
*uio
, int ioflag
, cred_t
*cred
,
2768 caller_context_t
*ct
)
2775 vfs_mntdummywrite(vnode_t
*vp
, uio_t
*uio
, int ioflag
, cred_t
*cred
,
2776 caller_context_t
*ct
)
2782 * The dummy vnode is currently used only by file events notification
2783 * module which is just interested in the timestamps.
2787 vfs_mntdummygetattr(vnode_t
*vp
, vattr_t
*vap
, int flags
, cred_t
*cr
,
2788 caller_context_t
*ct
)
2790 bzero(vap
, sizeof (vattr_t
));
2791 vap
->va_type
= VREG
;
2793 vap
->va_ctime
= vfs_mnttab_ctime
;
2795 * it is ok to just copy mtime as the time will be monotonically
2798 vap
->va_mtime
= vfs_mnttab_mtime
;
2799 vap
->va_atime
= vap
->va_mtime
;
2804 vfs_mnttabvp_setup(void)
2807 vnodeops_t
*vfs_mntdummyvnops
;
2808 const fs_operation_def_t mnt_dummyvnodeops_template
[] = {
2809 VOPNAME_READ
, { .vop_read
= vfs_mntdummyread
},
2810 VOPNAME_WRITE
, { .vop_write
= vfs_mntdummywrite
},
2811 VOPNAME_GETATTR
, { .vop_getattr
= vfs_mntdummygetattr
},
2812 VOPNAME_VNEVENT
, { .vop_vnevent
= fs_vnevent_support
},
2816 if (vn_make_ops("mnttab", mnt_dummyvnodeops_template
,
2817 &vfs_mntdummyvnops
) != 0) {
2818 cmn_err(CE_WARN
, "vfs_mnttabvp_setup: vn_make_ops failed");
2819 /* Shouldn't happen, but not bad enough to panic */
2824 * A global dummy vnode is allocated to represent mntfs files.
2825 * The mntfs file (/etc/mnttab) can be monitored for file events
2826 * and receive an event when mnttab changes. Dummy VOP calls
2827 * will be made on this vnode. The file events notification module
2828 * intercepts this vnode and delivers relevant events.
2830 tvp
= vn_alloc(KM_SLEEP
);
2831 tvp
->v_flag
= VNOMOUNT
|VNOMAP
|VNOSWAP
|VNOCACHE
;
2832 vn_setops(tvp
, vfs_mntdummyvnops
);
2835 * The mnt dummy ops do not reference v_data.
2836 * No other module intercepting this vnode should either.
2837 * Just set it to point to itself.
2839 tvp
->v_data
= (caddr_t
)tvp
;
2840 tvp
->v_vfsp
= rootvfs
;
2841 vfs_mntdummyvp
= tvp
;
2845 * performs fake read/write ops
2848 vfs_mnttab_rwop(int rw
)
2854 if (vfs_mntdummyvp
== NULL
)
2857 bzero(&uio
, sizeof (uio
));
2858 bzero(&iov
, sizeof (iov
));
2863 uio
.uio_loffset
= 0;
2864 uio
.uio_segflg
= UIO_SYSSPACE
;
2867 (void) VOP_WRITE(vfs_mntdummyvp
, &uio
, 0, kcred
, NULL
);
2869 (void) VOP_READ(vfs_mntdummyvp
, &uio
, 0, kcred
, NULL
);
2874 * Generate a write operation.
2877 vfs_mnttab_writeop(void)
2883 * Generate a read operation.
2886 vfs_mnttab_readop(void)
2892 * Free any mnttab information recorded in the vfs struct.
2893 * The vfs must not be on the vfs list.
2896 vfs_freemnttab(struct vfs
*vfsp
)
2898 ASSERT(!VFS_ON_LIST(vfsp
));
2901 * Free device and mount point information
2903 if (vfsp
->vfs_mntpt
!= NULL
) {
2904 refstr_rele(vfsp
->vfs_mntpt
);
2905 vfsp
->vfs_mntpt
= NULL
;
2907 if (vfsp
->vfs_resource
!= NULL
) {
2908 refstr_rele(vfsp
->vfs_resource
);
2909 vfsp
->vfs_resource
= NULL
;
2912 * Now free mount options information
2914 vfs_freeopttbl(&vfsp
->vfs_mntopts
);
2918 * Return the last mnttab modification time
2921 vfs_mnttab_modtime(timespec_t
*ts
)
2923 ASSERT(RW_LOCK_HELD(&vfslist
));
2924 *ts
= vfs_mnttab_mtime
;
2928 * See if mnttab is changed
2931 vfs_mnttab_poll(timespec_t
*old
, struct pollhead
**phpp
)
2935 *phpp
= (struct pollhead
*)NULL
;
2938 * Note: don't grab vfs list lock before accessing vfs_mnttab_mtime.
2939 * Can lead to deadlock against vfs_mnttab_modtimeupd(). It is safe
2940 * to not grab the vfs list lock because tv_sec is monotonically
2944 changed
= (old
->tv_nsec
!= vfs_mnttab_mtime
.tv_nsec
) ||
2945 (old
->tv_sec
!= vfs_mnttab_mtime
.tv_sec
);
2947 *phpp
= &vfs_pollhd
;
2951 /* Provide a unique and monotonically-increasing timestamp. */
2953 vfs_mono_time(timespec_t
*ts
)
2955 static volatile hrtime_t hrt
; /* The saved time. */
2956 hrtime_t newhrt
, oldhrt
; /* For effecting the CAS. */
2960 * Try gethrestime() first, but be prepared to fabricate a sensible
2961 * answer at the first sign of any trouble.
2963 gethrestime(&newts
);
2964 newhrt
= ts2hrt(&newts
);
2969 if (atomic_cas_64((uint64_t *)&hrt
, oldhrt
, newhrt
) == oldhrt
)
2976 * Update the mnttab modification time and wake up any waiters for
2980 vfs_mnttab_modtimeupd()
2982 hrtime_t oldhrt
, newhrt
;
2984 ASSERT(RW_WRITE_HELD(&vfslist
));
2985 oldhrt
= ts2hrt(&vfs_mnttab_mtime
);
2986 gethrestime(&vfs_mnttab_mtime
);
2987 newhrt
= ts2hrt(&vfs_mnttab_mtime
);
2988 if (oldhrt
== (hrtime_t
)0)
2989 vfs_mnttab_ctime
= vfs_mnttab_mtime
;
2991 * Attempt to provide unique mtime (like uniqtime but not).
2993 if (newhrt
== oldhrt
) {
2995 hrt2ts(newhrt
, &vfs_mnttab_mtime
);
2997 pollwakeup(&vfs_pollhd
, (short)POLLRDBAND
);
2998 vfs_mnttab_writeop();
3002 dounmount(struct vfs
*vfsp
, int flag
, cred_t
*cr
)
3006 extern void teardown_vopstats(vfs_t
*);
3009 * Get covered vnode. This will be NULL if the vfs is not linked
3010 * into the file system name space (i.e., domount() with MNT_NOSPICE).
3012 coveredvp
= vfsp
->vfs_vnodecovered
;
3013 ASSERT(coveredvp
== NULL
|| vn_vfswlock_held(coveredvp
));
3016 * Purge all dnlc entries for this vfs.
3018 (void) dnlc_purge_vfsp(vfsp
, 0);
3020 /* For forcible umount, skip VFS_SYNC() since it may hang */
3021 if ((flag
& MS_FORCE
) == 0)
3022 (void) VFS_SYNC(vfsp
, 0, cr
);
3025 * Lock the vfs to maintain fs status quo during unmount. This
3026 * has to be done after the sync because ufs_update tries to acquire
3029 vfs_lock_wait(vfsp
);
3031 if (error
= VFS_UNMOUNT(vfsp
, flag
, cr
)) {
3033 if (coveredvp
!= NULL
)
3034 vn_vfsunlock(coveredvp
);
3035 } else if (coveredvp
!= NULL
) {
3036 teardown_vopstats(vfsp
);
3038 * vfs_remove() will do a VN_RELE(vfsp->vfs_vnodecovered)
3039 * when it frees vfsp so we do a VN_HOLD() so we can
3040 * continue to use coveredvp afterwards.
3044 vn_vfsunlock(coveredvp
);
3047 teardown_vopstats(vfsp
);
3049 * Release the reference to vfs that is not linked
3050 * into the name space.
3060 * Vfs_unmountall() is called by uadmin() to unmount all
3061 * mounted file systems (except the root file system) during shutdown.
3062 * It follows the existing locking protocol when traversing the vfs list
3063 * to sync and unmount vfses. Even though there should be no
3064 * other thread running while the system is shutting down, it is prudent
3065 * to still follow the locking protocol.
3068 vfs_unmountall(void)
3071 struct vfs
*prev_vfsp
= NULL
;
3075 * Toss all dnlc entries now so that the per-vfs sync
3076 * and unmount operations don't have to slog through
3077 * a bunch of uninteresting vnodes over and over again.
3082 for (vfsp
= rootvfs
->vfs_prev
; vfsp
!= rootvfs
; vfsp
= prev_vfsp
) {
3083 prev_vfsp
= vfsp
->vfs_prev
;
3085 if (vfs_lock(vfsp
) != 0)
3087 error
= vn_vfswlock(vfsp
->vfs_vnodecovered
);
3094 (void) VFS_SYNC(vfsp
, SYNC_CLOSE
, CRED());
3095 (void) dounmount(vfsp
, 0, CRED());
3098 * Since we dropped the vfslist lock above we must
3099 * verify that next_vfsp still exists, else start over.
3102 for (vfsp
= rootvfs
->vfs_prev
;
3103 vfsp
!= rootvfs
; vfsp
= vfsp
->vfs_prev
)
3104 if (vfsp
== prev_vfsp
)
3106 if (vfsp
== rootvfs
&& prev_vfsp
!= rootvfs
)
3107 prev_vfsp
= rootvfs
->vfs_prev
;
3113 * Called to add an entry to the end of the vfs mount in progress list
3116 vfs_addmip(dev_t dev
, struct vfs
*vfsp
)
3120 mipp
= (struct ipmnt
*)kmem_alloc(sizeof (struct ipmnt
), KM_SLEEP
);
3121 mipp
->mip_next
= NULL
;
3122 mipp
->mip_dev
= dev
;
3123 mipp
->mip_vfsp
= vfsp
;
3124 mutex_enter(&vfs_miplist_mutex
);
3125 if (vfs_miplist_end
!= NULL
)
3126 vfs_miplist_end
->mip_next
= mipp
;
3129 vfs_miplist_end
= mipp
;
3130 mutex_exit(&vfs_miplist_mutex
);
3134 * Called to remove an entry from the mount in progress list
3135 * Either because the mount completed or it failed.
3138 vfs_delmip(struct vfs
*vfsp
)
3140 struct ipmnt
*mipp
, *mipprev
;
3142 mutex_enter(&vfs_miplist_mutex
);
3144 for (mipp
= vfs_miplist
;
3145 mipp
&& mipp
->mip_vfsp
!= vfsp
; mipp
= mipp
->mip_next
) {
3149 return; /* shouldn't happen */
3150 if (mipp
== vfs_miplist_end
)
3151 vfs_miplist_end
= mipprev
;
3152 if (mipprev
== NULL
)
3153 vfs_miplist
= mipp
->mip_next
;
3155 mipprev
->mip_next
= mipp
->mip_next
;
3156 mutex_exit(&vfs_miplist_mutex
);
3157 kmem_free(mipp
, sizeof (struct ipmnt
));
3161 * vfs_add is called by a specific filesystem's mount routine to add
3162 * the new vfs into the vfs list/hash and to cover the mounted-on vnode.
3163 * The vfs should already have been locked by the caller.
3165 * coveredvp is NULL if this is the root.
3168 vfs_add(vnode_t
*coveredvp
, struct vfs
*vfsp
, int mflag
)
3172 ASSERT(vfs_lock_held(vfsp
));
3174 newflag
= vfsp
->vfs_flag
;
3175 if (mflag
& MS_RDONLY
)
3176 newflag
|= VFS_RDONLY
;
3178 newflag
&= ~VFS_RDONLY
;
3179 if (mflag
& MS_NOSUID
)
3180 newflag
|= (VFS_NOSETUID
|VFS_NODEVICES
);
3182 newflag
&= ~(VFS_NOSETUID
|VFS_NODEVICES
);
3183 if (mflag
& MS_NOMNTTAB
)
3184 newflag
|= VFS_NOMNTTAB
;
3186 newflag
&= ~VFS_NOMNTTAB
;
3188 if (coveredvp
!= NULL
) {
3189 ASSERT(vn_vfswlock_held(coveredvp
));
3190 coveredvp
->v_vfsmountedhere
= vfsp
;
3193 vfsp
->vfs_vnodecovered
= coveredvp
;
3194 vfsp
->vfs_flag
= newflag
;
3200 * Remove a vfs from the vfs list, null out the pointer from the
3201 * covered vnode to the vfs (v_vfsmountedhere), and null out the pointer
3202 * from the vfs to the covered vnode (vfs_vnodecovered). Release the
3203 * reference to the vfs and to the covered vnode.
3205 * Called from dounmount after it's confirmed with the file system
3206 * that the unmount is legal.
3209 vfs_remove(struct vfs
*vfsp
)
3213 ASSERT(vfs_lock_held(vfsp
));
3216 * Can't unmount root. Should never happen because fs will
3219 if (vfsp
== rootvfs
)
3220 panic("vfs_remove: unmounting root");
3222 vfs_list_remove(vfsp
);
3225 * Unhook from the file system name space.
3227 vp
= vfsp
->vfs_vnodecovered
;
3228 ASSERT(vn_vfswlock_held(vp
));
3229 vp
->v_vfsmountedhere
= NULL
;
3230 vfsp
->vfs_vnodecovered
= NULL
;
3234 * Release lock and wakeup anybody waiting.
3241 * Lock a filesystem to prevent access to it while mounting,
3242 * unmounting and syncing. Return EBUSY immediately if lock
3243 * can't be acquired.
3246 vfs_lock(vfs_t
*vfsp
)
3248 vn_vfslocks_entry_t
*vpvfsentry
;
3250 vpvfsentry
= vn_vfslocks_getlock(vfsp
);
3251 if (rwst_tryenter(&vpvfsentry
->ve_lock
, RW_WRITER
))
3254 vn_vfslocks_rele(vpvfsentry
);
3259 vfs_rlock(vfs_t
*vfsp
)
3261 vn_vfslocks_entry_t
*vpvfsentry
;
3263 vpvfsentry
= vn_vfslocks_getlock(vfsp
);
3265 if (rwst_tryenter(&vpvfsentry
->ve_lock
, RW_READER
))
3268 vn_vfslocks_rele(vpvfsentry
);
3273 vfs_lock_wait(vfs_t
*vfsp
)
3275 vn_vfslocks_entry_t
*vpvfsentry
;
3277 vpvfsentry
= vn_vfslocks_getlock(vfsp
);
3278 rwst_enter(&vpvfsentry
->ve_lock
, RW_WRITER
);
3282 vfs_rlock_wait(vfs_t
*vfsp
)
3284 vn_vfslocks_entry_t
*vpvfsentry
;
3286 vpvfsentry
= vn_vfslocks_getlock(vfsp
);
3287 rwst_enter(&vpvfsentry
->ve_lock
, RW_READER
);
3291 * Unlock a locked filesystem.
3294 vfs_unlock(vfs_t
*vfsp
)
3296 vn_vfslocks_entry_t
*vpvfsentry
;
3299 * vfs_unlock will mimic sema_v behaviour to fix 4748018.
3300 * And these changes should remain for the patch changes as it is.
3306 * ve_refcount needs to be dropped twice here.
3307 * 1. To release refernce after a call to vfs_locks_getlock()
3308 * 2. To release the reference from the locking routines like
3309 * vfs_rlock_wait/vfs_wlock_wait/vfs_wlock etc,.
3312 vpvfsentry
= vn_vfslocks_getlock(vfsp
);
3313 vn_vfslocks_rele(vpvfsentry
);
3315 rwst_exit(&vpvfsentry
->ve_lock
);
3316 vn_vfslocks_rele(vpvfsentry
);
3320 * Utility routine that allows a filesystem to construct its
3321 * fsid in "the usual way" - by munging some underlying dev_t and
3322 * the filesystem type number into the 64-bit fsid. Note that
3323 * this implicitly relies on dev_t persistence to make filesystem
3326 * There's nothing to prevent an individual fs from constructing its
3327 * fsid in a different way, and indeed they should.
3329 * Since we want fsids to be 32-bit quantities (so that they can be
3330 * exported identically by either 32-bit or 64-bit APIs, as well as
3331 * the fact that fsid's are "known" to NFS), we compress the device
3332 * number given down to 32-bits, and panic if that isn't possible.
3335 vfs_make_fsid(fsid_t
*fsi
, dev_t dev
, int val
)
3337 if (!cmpldev((dev32_t
*)&fsi
->val
[0], dev
))
3338 panic("device number too big for fsid!");
3343 vfs_lock_held(vfs_t
*vfsp
)
3346 vn_vfslocks_entry_t
*vpvfsentry
;
3349 * vfs_lock_held will mimic sema_held behaviour
3350 * if panicstr is set. And these changes should remain
3351 * for the patch changes as it is.
3356 vpvfsentry
= vn_vfslocks_getlock(vfsp
);
3357 held
= rwst_lock_held(&vpvfsentry
->ve_lock
, RW_WRITER
);
3359 vn_vfslocks_rele(vpvfsentry
);
3364 vfs_lock_owner(vfs_t
*vfsp
)
3366 struct _kthread
*owner
;
3367 vn_vfslocks_entry_t
*vpvfsentry
;
3370 * vfs_wlock_held will mimic sema_held behaviour
3371 * if panicstr is set. And these changes should remain
3372 * for the patch changes as it is.
3377 vpvfsentry
= vn_vfslocks_getlock(vfsp
);
3378 owner
= rwst_owner(&vpvfsentry
->ve_lock
);
3380 vn_vfslocks_rele(vpvfsentry
);
3387 * Rather than manipulate the vfslist lock directly, we abstract into lock
3388 * and unlock routines to allow the locking implementation to be changed for
3391 * Whenever the vfs list is modified through its hash links, the overall list
3392 * lock must be obtained before locking the relevant hash bucket. But to see
3393 * whether a given vfs is on the list, it suffices to obtain the lock for the
3394 * hash bucket without getting the overall list lock. (See getvfs() below.)
3400 rw_enter(&vfslist
, RW_WRITER
);
3404 vfs_list_read_lock()
3406 rw_enter(&vfslist
, RW_READER
);
3416 * Low level worker routines for adding entries to and removing entries from
3421 vfs_hash_add(struct vfs
*vfsp
, int insert_at_head
)
3427 ASSERT(RW_WRITE_HELD(&vfslist
));
3429 dev
= expldev(vfsp
->vfs_fsid
.val
[0]);
3430 vhno
= VFSHASH(getmajor(dev
), getminor(dev
));
3432 mutex_enter(&rvfs_list
[vhno
].rvfs_lock
);
3435 * Link into the hash table, inserting it at the end, so that LOFS
3436 * with the same fsid as UFS (or other) file systems will not hide the
3439 if (insert_at_head
) {
3440 vfsp
->vfs_hash
= rvfs_list
[vhno
].rvfs_head
;
3441 rvfs_list
[vhno
].rvfs_head
= vfsp
;
3443 for (hp
= &rvfs_list
[vhno
].rvfs_head
; *hp
!= NULL
;
3444 hp
= &(*hp
)->vfs_hash
)
3447 * hp now contains the address of the pointer to update
3448 * to effect the insertion.
3450 vfsp
->vfs_hash
= NULL
;
3454 rvfs_list
[vhno
].rvfs_len
++;
3455 mutex_exit(&rvfs_list
[vhno
].rvfs_lock
);
3460 vfs_hash_remove(struct vfs
*vfsp
)
3466 ASSERT(RW_WRITE_HELD(&vfslist
));
3468 dev
= expldev(vfsp
->vfs_fsid
.val
[0]);
3469 vhno
= VFSHASH(getmajor(dev
), getminor(dev
));
3471 mutex_enter(&rvfs_list
[vhno
].rvfs_lock
);
3476 if (rvfs_list
[vhno
].rvfs_head
== vfsp
) {
3477 rvfs_list
[vhno
].rvfs_head
= vfsp
->vfs_hash
;
3478 rvfs_list
[vhno
].rvfs_len
--;
3481 for (tvfsp
= rvfs_list
[vhno
].rvfs_head
; tvfsp
!= NULL
;
3482 tvfsp
= tvfsp
->vfs_hash
) {
3483 if (tvfsp
->vfs_hash
== vfsp
) {
3484 tvfsp
->vfs_hash
= vfsp
->vfs_hash
;
3485 rvfs_list
[vhno
].rvfs_len
--;
3489 cmn_err(CE_WARN
, "vfs_list_remove: vfs not found in hash");
3493 mutex_exit(&rvfs_list
[vhno
].rvfs_lock
);
3498 vfs_list_add(struct vfs
*vfsp
)
3503 * Typically, the vfs_t will have been created on behalf of the file
3504 * system in vfs_init, where it will have been provided with a
3505 * vfs_impl_t. This, however, might be lacking if the vfs_t was created
3506 * by an unbundled file system. We therefore check for such an example
3507 * before stamping the vfs_t with its creation time for the benefit of
3510 if (vfsp
->vfs_implp
== NULL
)
3511 vfsimpl_setup(vfsp
);
3512 vfs_mono_time(&vfsp
->vfs_hrctime
);
3515 * The zone that owns the mount is the one that performed the mount.
3516 * Note that this isn't necessarily the same as the zone mounted into.
3517 * The corresponding zone_rele_ref() will be done when the vfs_t
3520 vfsp
->vfs_zone
= curproc
->p_zone
;
3521 zone_init_ref(&vfsp
->vfs_implp
->vi_zone_ref
);
3522 zone_hold_ref(vfsp
->vfs_zone
, &vfsp
->vfs_implp
->vi_zone_ref
,
3526 * Find the zone mounted into, and put this mount on its vfs list.
3528 zone
= zone_find_by_path(refstr_value(vfsp
->vfs_mntpt
));
3529 ASSERT(zone
!= NULL
);
3531 * Special casing for the root vfs. This structure is allocated
3532 * statically and hooked onto rootvfs at link time. During the
3533 * vfs_mountroot call at system startup time, the root file system's
3534 * VFS_MOUNTROOT routine will call vfs_add with this root vfs struct
3535 * as argument. The code below must detect and handle this special
3536 * case. The only apparent justification for this special casing is
3537 * to ensure that the root file system appears at the head of the
3540 * XXX: I'm assuming that it's ok to do normal list locking when
3541 * adding the entry for the root file system (this used to be
3542 * done with no locks held).
3546 * Link into the vfs list proper.
3548 if (vfsp
== &root
) {
3550 * Assert: This vfs is already on the list as its first entry.
3551 * Thus, there's nothing to do.
3553 ASSERT(rootvfs
== vfsp
);
3555 * Add it to the head of the global zone's vfslist.
3557 ASSERT(zone
== global_zone
);
3558 ASSERT(zone
->zone_vfslist
== NULL
);
3559 zone
->zone_vfslist
= vfsp
;
3562 * Link to end of list using vfs_prev (as rootvfs is now a
3563 * doubly linked circular list) so list is in mount order for
3566 rootvfs
->vfs_prev
->vfs_next
= vfsp
;
3567 vfsp
->vfs_prev
= rootvfs
->vfs_prev
;
3568 rootvfs
->vfs_prev
= vfsp
;
3569 vfsp
->vfs_next
= rootvfs
;
3572 * Do it again for the zone-private list (which may be NULL).
3574 if (zone
->zone_vfslist
== NULL
) {
3575 ASSERT(zone
!= global_zone
);
3576 zone
->zone_vfslist
= vfsp
;
3578 zone
->zone_vfslist
->vfs_zone_prev
->vfs_zone_next
= vfsp
;
3579 vfsp
->vfs_zone_prev
= zone
->zone_vfslist
->vfs_zone_prev
;
3580 zone
->zone_vfslist
->vfs_zone_prev
= vfsp
;
3581 vfsp
->vfs_zone_next
= zone
->zone_vfslist
;
3586 * Link into the hash table, inserting it at the end, so that LOFS
3587 * with the same fsid as UFS (or other) file systems will not hide
3590 vfs_hash_add(vfsp
, 0);
3593 * update the mnttab modification time
3595 vfs_mnttab_modtimeupd();
3601 vfs_list_remove(struct vfs
*vfsp
)
3605 zone
= zone_find_by_path(refstr_value(vfsp
->vfs_mntpt
));
3606 ASSERT(zone
!= NULL
);
3608 * Callers are responsible for preventing attempts to unmount the
3611 ASSERT(vfsp
!= rootvfs
);
3618 vfs_hash_remove(vfsp
);
3621 * Remove from vfs list.
3623 vfsp
->vfs_prev
->vfs_next
= vfsp
->vfs_next
;
3624 vfsp
->vfs_next
->vfs_prev
= vfsp
->vfs_prev
;
3625 vfsp
->vfs_next
= vfsp
->vfs_prev
= NULL
;
3628 * Remove from zone-specific vfs list.
3630 if (zone
->zone_vfslist
== vfsp
)
3631 zone
->zone_vfslist
= vfsp
->vfs_zone_next
;
3633 if (vfsp
->vfs_zone_next
== vfsp
) {
3634 ASSERT(vfsp
->vfs_zone_prev
== vfsp
);
3635 ASSERT(zone
->zone_vfslist
== vfsp
);
3636 zone
->zone_vfslist
= NULL
;
3639 vfsp
->vfs_zone_prev
->vfs_zone_next
= vfsp
->vfs_zone_next
;
3640 vfsp
->vfs_zone_next
->vfs_zone_prev
= vfsp
->vfs_zone_prev
;
3641 vfsp
->vfs_zone_next
= vfsp
->vfs_zone_prev
= NULL
;
3644 * update the mnttab modification time
3646 vfs_mnttab_modtimeupd();
3652 getvfs(fsid_t
*fsid
)
3655 int val0
= fsid
->val
[0];
3656 int val1
= fsid
->val
[1];
3657 dev_t dev
= expldev(val0
);
3658 int vhno
= VFSHASH(getmajor(dev
), getminor(dev
));
3659 kmutex_t
*hmp
= &rvfs_list
[vhno
].rvfs_lock
;
3662 for (vfsp
= rvfs_list
[vhno
].rvfs_head
; vfsp
; vfsp
= vfsp
->vfs_hash
) {
3663 if (vfsp
->vfs_fsid
.val
[0] == val0
&&
3664 vfsp
->vfs_fsid
.val
[1] == val1
) {
3675 * Search the vfs mount in progress list for a specified device/vfs entry.
3676 * Returns 0 if the first entry in the list that the device matches has the
3677 * given vfs pointer as well. If the device matches but a different vfs
3678 * pointer is encountered in the list before the given vfs pointer then
3683 vfs_devmounting(dev_t dev
, struct vfs
*vfsp
)
3688 mutex_enter(&vfs_miplist_mutex
);
3689 for (mipp
= vfs_miplist
; mipp
!= NULL
; mipp
= mipp
->mip_next
) {
3690 if (mipp
->mip_dev
== dev
) {
3691 if (mipp
->mip_vfsp
!= vfsp
)
3696 mutex_exit(&vfs_miplist_mutex
);
3701 * Search the vfs list for a specified device. Returns 1, if entry is found
3702 * or 0 if no suitable entry is found.
3706 vfs_devismounted(dev_t dev
)
3711 vfs_list_read_lock();
3715 if (vfsp
->vfs_dev
== dev
) {
3719 vfsp
= vfsp
->vfs_next
;
3720 } while (vfsp
!= rootvfs
);
3727 * Search the vfs list for a specified device. Returns a pointer to it
3728 * or NULL if no suitable entry is found. The caller of this routine
3729 * is responsible for releasing the returned vfs pointer.
3732 vfs_dev2vfsp(dev_t dev
)
3737 vfs_list_read_lock();
3742 * The following could be made more efficient by making
3743 * the entire loop use vfs_zone_next if the call is from
3744 * a zone. The only callers, however, ustat(2) and
3745 * umount2(2), don't seem to justify the added
3746 * complexity at present.
3748 if (vfsp
->vfs_dev
== dev
&&
3749 ZONE_PATH_VISIBLE(refstr_value(vfsp
->vfs_mntpt
),
3755 vfsp
= vfsp
->vfs_next
;
3756 } while (vfsp
!= rootvfs
);
3758 return (found
? vfsp
: NULL
);
3762 * Search the vfs list for a specified mntpoint. Returns a pointer to it
3763 * or NULL if no suitable entry is found. The caller of this routine
3764 * is responsible for releasing the returned vfs pointer.
3766 * Note that if multiple mntpoints match, the last one matching is
3767 * returned in an attempt to return the "top" mount when overlay
3768 * mounts are covering the same mount point. This is accomplished by starting
3769 * at the end of the list and working our way backwards, stopping at the first
3773 vfs_mntpoint2vfsp(const char *mp
)
3776 struct vfs
*retvfsp
= NULL
;
3777 zone_t
*zone
= curproc
->p_zone
;
3780 vfs_list_read_lock();
3781 if (getzoneid() == GLOBAL_ZONEID
) {
3783 * The global zone may see filesystems in any zone.
3785 vfsp
= rootvfs
->vfs_prev
;
3787 if (strcmp(refstr_value(vfsp
->vfs_mntpt
), mp
) == 0) {
3791 vfsp
= vfsp
->vfs_prev
;
3792 } while (vfsp
!= rootvfs
->vfs_prev
);
3793 } else if ((list
= zone
->zone_vfslist
) != NULL
) {
3796 vfsp
= list
->vfs_zone_prev
;
3798 mntpt
= refstr_value(vfsp
->vfs_mntpt
);
3799 mntpt
= ZONE_PATH_TRANSLATE(mntpt
, zone
);
3800 if (strcmp(mntpt
, mp
) == 0) {
3804 vfsp
= vfsp
->vfs_zone_prev
;
3805 } while (vfsp
!= list
->vfs_zone_prev
);
3814 * Search the vfs list for a specified vfsops.
3815 * if vfs entry is found then return 1, else 0.
3818 vfs_opsinuse(vfsops_t
*ops
)
3823 vfs_list_read_lock();
3827 if (vfs_getops(vfsp
) == ops
) {
3831 vfsp
= vfsp
->vfs_next
;
3832 } while (vfsp
!= rootvfs
);
3838 * Allocate an entry in vfssw for a file system type
3841 allocate_vfssw(const char *type
)
3845 if (type
[0] == '\0' || strlen(type
) + 1 > _ST_FSTYPSZ
) {
3847 * The vfssw table uses the empty string to identify an
3848 * available entry; we cannot add any type which has
3849 * a leading NUL. The string length is limited to
3850 * the size of the st_fstype array in struct stat.
3855 ASSERT(VFSSW_WRITE_LOCKED());
3856 for (vswp
= &vfssw
[1]; vswp
< &vfssw
[nfstype
]; vswp
++)
3857 if (!ALLOCATED_VFSSW(vswp
)) {
3858 vswp
->vsw_name
= kmem_alloc(strlen(type
) + 1, KM_SLEEP
);
3859 (void) strcpy(vswp
->vsw_name
, type
);
3860 ASSERT(vswp
->vsw_count
== 0);
3861 vswp
->vsw_count
= 1;
3862 mutex_init(&vswp
->vsw_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
3869 * Impose additional layer of translation between vfstype names
3870 * and module names in the filesystem.
3873 vfs_to_modname(const char *vfstype
)
3875 if (strcmp(vfstype
, "proc") == 0) {
3877 } else if (strcmp(vfstype
, "fd") == 0) {
3879 } else if (strncmp(vfstype
, "nfs", 3) == 0) {
3887 * Find a vfssw entry given a file system type name.
3888 * Try to autoload the filesystem if it's not found.
3889 * If it's installed, return the vfssw locked to prevent unloading.
3892 vfs_getvfssw(const char *type
)
3895 const char *modname
;
3898 vswp
= vfs_getvfsswbyname(type
);
3899 modname
= vfs_to_modname(type
);
3901 if (rootdir
== NULL
) {
3903 * If we haven't yet loaded the root file system, then our
3904 * _init won't be called until later. Allocate vfssw entry,
3905 * because mod_installfs won't be called.
3910 if ((vswp
= vfs_getvfsswbyname(type
)) == NULL
) {
3911 if ((vswp
= allocate_vfssw(type
)) == NULL
) {
3919 if (!VFS_INSTALLED(vswp
)) {
3921 (void) modloadonly("fs", modname
);
3928 * Try to load the filesystem. Before calling modload(), we drop
3929 * our lock on the VFS switch table, and pick it up after the
3930 * module is loaded. However, there is a potential race: the
3931 * module could be unloaded after the call to modload() completes
3932 * but before we pick up the lock and drive on. Therefore,
3933 * we keep reloading the module until we've loaded the module
3934 * _and_ we have the lock on the VFS switch table.
3936 while (vswp
== NULL
|| !VFS_INSTALLED(vswp
)) {
3938 if (modload("fs", modname
) == -1)
3942 if ((vswp
= vfs_getvfsswbyname(type
)) == NULL
)
3951 * Find a vfssw entry given a file system type name.
3954 vfs_getvfsswbyname(const char *type
)
3958 ASSERT(VFSSW_LOCKED());
3959 if (type
== NULL
|| *type
== '\0')
3962 for (vswp
= &vfssw
[1]; vswp
< &vfssw
[nfstype
]; vswp
++) {
3963 if (strcmp(type
, vswp
->vsw_name
) == 0) {
3973 * Find a vfssw entry given a set of vfsops.
3976 vfs_getvfsswbyvfsops(vfsops_t
*vfsops
)
3981 for (vswp
= &vfssw
[1]; vswp
< &vfssw
[nfstype
]; vswp
++) {
3982 if (ALLOCATED_VFSSW(vswp
) && &vswp
->vsw_vfsops
== vfsops
) {
3994 * Reference a vfssw entry.
3997 vfs_refvfssw(struct vfssw
*vswp
)
4000 mutex_enter(&vswp
->vsw_lock
);
4002 mutex_exit(&vswp
->vsw_lock
);
4006 * Unreference a vfssw entry.
4009 vfs_unrefvfssw(struct vfssw
*vswp
)
4012 mutex_enter(&vswp
->vsw_lock
);
4014 mutex_exit(&vswp
->vsw_lock
);
4017 static int sync_retries
= 20; /* number of retries when not making progress */
4018 static int sync_triesleft
; /* portion of sync_retries remaining */
4020 static pgcnt_t old_pgcnt
, new_pgcnt
;
4021 static int new_bufcnt
, old_bufcnt
;
4024 * Sync all of the mounted filesystems, and then wait for the actual i/o to
4025 * complete. We wait by counting the number of dirty pages and buffers,
4026 * pushing them out using bio_busy() and page_busy(), and then counting again.
4027 * This routine is used during the uadmin A_SHUTDOWN code. It should only
4028 * be used after some higher-level mechanism has quiesced the system so that
4029 * new writes are not being initiated while we are waiting for completion.
4031 * To ensure finite running time, our algorithm uses sync_triesleft (a progress
4032 * counter used by the vfs_syncall() loop below). It is declared above so
4033 * it can be found easily in the debugger.
4035 * The sync_triesleft counter is updated by vfs_syncall() itself. If we make
4036 * sync_retries consecutive calls to bio_busy() and page_busy() without
4037 * decreasing either the number of dirty buffers or dirty pages below the
4038 * lowest count we have seen so far, we give up and return from vfs_syncall().
4040 * Each loop iteration ends with a call to delay() one second to allow time for
4041 * i/o completion and to permit the user time to read our progress messages.
4046 if (rootdir
== NULL
&& !modrootloaded
)
4047 return; /* no filesystems have been loaded yet */
4049 printf("syncing file systems...");
4052 sync_triesleft
= sync_retries
;
4054 old_bufcnt
= new_bufcnt
= INT_MAX
;
4055 old_pgcnt
= new_pgcnt
= ULONG_MAX
;
4057 while (sync_triesleft
> 0) {
4058 old_bufcnt
= MIN(old_bufcnt
, new_bufcnt
);
4059 old_pgcnt
= MIN(old_pgcnt
, new_pgcnt
);
4061 new_bufcnt
= bio_busy(B_TRUE
);
4062 new_pgcnt
= page_busy(B_TRUE
);
4064 if (new_bufcnt
== 0 && new_pgcnt
== 0)
4067 if (new_bufcnt
< old_bufcnt
|| new_pgcnt
< old_pgcnt
)
4068 sync_triesleft
= sync_retries
;
4073 printf(" [%d]", new_bufcnt
);
4075 printf(" %lu", new_pgcnt
);
4080 if (new_bufcnt
!= 0 || new_pgcnt
!= 0)
4081 printf(" done (not all i/o completed)\n");
4089 * Map VFS flags to statvfs flags. These shouldn't really be separate
4093 vf_to_stf(uint_t vf
)
4097 if (vf
& VFS_RDONLY
)
4099 if (vf
& VFS_NOSETUID
)
4101 if (vf
& VFS_NOTRUNC
)
4108 * Entries for (illegal) fstype 0.
4112 vfsstray_sync(struct vfs
*vfsp
, short arg
, struct cred
*cr
)
4114 cmn_err(CE_PANIC
, "stray vfs operation");
4119 * Entries for (illegal) fstype 0.
4124 cmn_err(CE_PANIC
, "stray vfs operation");
4129 * Support for dealing with forced UFS unmount and its interaction with
4130 * LOFS. Could be used by any filesystem.
4140 * We've gotta define the op for sync separately, since the compiler gets
4141 * confused if we mix and match ANSI and normal style prototypes when
4142 * a "short" argument is present and spits out a warning.
4146 vfs_EIO_sync(struct vfs
*vfsp
, short arg
, struct cred
*cr
)
4152 vfsops_t
*EIO_vfsops
;
4155 * Called from startup() to initialize all loaded vfs's
4162 extern int vopstats_enabled
;
4163 extern void vopstats_startup();
4165 static const fs_operation_def_t EIO_vfsops_template
[] = {
4166 VFSNAME_MOUNT
, { .error
= vfs_EIO
},
4167 VFSNAME_UNMOUNT
, { .error
= vfs_EIO
},
4168 VFSNAME_ROOT
, { .error
= vfs_EIO
},
4169 VFSNAME_STATVFS
, { .error
= vfs_EIO
},
4170 VFSNAME_SYNC
, { .vfs_sync
= vfs_EIO_sync
},
4171 VFSNAME_VGET
, { .error
= vfs_EIO
},
4172 VFSNAME_MOUNTROOT
, { .error
= vfs_EIO
},
4173 VFSNAME_FREEVFS
, { .error
= vfs_EIO
},
4174 VFSNAME_VNSTATE
, { .error
= vfs_EIO
},
4178 static const fs_operation_def_t stray_vfsops_template
[] = {
4179 VFSNAME_MOUNT
, { .error
= vfsstray
},
4180 VFSNAME_UNMOUNT
, { .error
= vfsstray
},
4181 VFSNAME_ROOT
, { .error
= vfsstray
},
4182 VFSNAME_STATVFS
, { .error
= vfsstray
},
4183 VFSNAME_SYNC
, { .vfs_sync
= vfsstray_sync
},
4184 VFSNAME_VGET
, { .error
= vfsstray
},
4185 VFSNAME_MOUNTROOT
, { .error
= vfsstray
},
4186 VFSNAME_FREEVFS
, { .error
= vfsstray
},
4187 VFSNAME_VNSTATE
, { .error
= vfsstray
},
4191 /* Create vfs cache */
4192 vfs_cache
= kmem_cache_create("vfs_cache", sizeof (struct vfs
),
4193 sizeof (uintptr_t), NULL
, NULL
, NULL
, NULL
, NULL
, 0);
4195 /* Initialize the vnode cache (file systems may use it during init). */
4198 /* Setup event monitor framework */
4201 /* Initialize the dummy stray file system type. */
4202 error
= vfs_setfsops(0, stray_vfsops_template
, NULL
);
4204 /* Initialize the dummy EIO file system. */
4205 error
= vfs_makefsops(EIO_vfsops_template
, &EIO_vfsops
);
4207 cmn_err(CE_WARN
, "vfsinit: bad EIO vfs ops template");
4208 /* Shouldn't happen, but not bad enough to panic */
4211 VFS_INIT(&EIO_vfs
, EIO_vfsops
, (caddr_t
)NULL
);
4214 * Default EIO_vfs.vfs_flag to VFS_UNMOUNTED so a lookup
4215 * on this vfs can immediately notice it's invalid.
4217 EIO_vfs
.vfs_flag
|= VFS_UNMOUNTED
;
4220 * Call the init routines of non-loadable filesystems only.
4221 * Filesystems which are loaded as separate modules will be
4222 * initialized by the module loading code instead.
4225 for (vswp
= &vfssw
[1]; vswp
< &vfssw
[nfstype
]; vswp
++) {
4227 if (vswp
->vsw_init
!= NULL
)
4228 (*vswp
->vsw_init
)(vswp
- vfssw
, vswp
->vsw_name
);
4234 if (vopstats_enabled
) {
4235 /* EIO_vfs can collect stats, but we don't retrieve them */
4236 initialize_vopstats(&EIO_vfs
.vfs_vopstats
);
4237 EIO_vfs
.vfs_fstypevsp
= NULL
;
4238 EIO_vfs
.vfs_vskap
= NULL
;
4239 EIO_vfs
.vfs_flag
|= VFS_STATS
;
4244 reparse_point_init();
4248 vfs_alloc(int kmflag
)
4252 vfsp
= kmem_cache_alloc(vfs_cache
, kmflag
);
4255 * Do the simplest initialization here.
4256 * Everything else gets done in vfs_init()
4258 bzero(vfsp
, sizeof (vfs_t
));
4263 vfs_free(vfs_t
*vfsp
)
4266 * One would be tempted to assert that "vfsp->vfs_count == 0".
4267 * The problem is that this gets called out of domount() with
4268 * a partially initialized vfs and a vfs_count of 1. This is
4269 * also called from vfs_rele() with a vfs_count of 0. We can't
4270 * call VFS_RELE() from domount() if VFS_MOUNT() hasn't successfully
4271 * returned. This is because VFS_MOUNT() fully initializes the
4272 * vfs structure and its associated data. VFS_RELE() will call
4273 * VFS_FREEVFS() which may panic the system if the data structures
4274 * aren't fully initialized from a successful VFS_MOUNT()).
4277 /* If FEM was in use, make sure everything gets cleaned up */
4278 if (vfsp
->vfs_femhead
) {
4279 ASSERT(vfsp
->vfs_femhead
->femh_list
== NULL
);
4280 mutex_destroy(&vfsp
->vfs_femhead
->femh_lock
);
4281 kmem_free(vfsp
->vfs_femhead
, sizeof (*(vfsp
->vfs_femhead
)));
4282 vfsp
->vfs_femhead
= NULL
;
4285 if (vfsp
->vfs_implp
)
4286 vfsimpl_teardown(vfsp
);
4287 sema_destroy(&vfsp
->vfs_reflock
);
4288 kmem_cache_free(vfs_cache
, vfsp
);
4292 * Increments the vfs reference count by one atomically.
4295 vfs_hold(vfs_t
*vfsp
)
4297 atomic_inc_32(&vfsp
->vfs_count
);
4298 ASSERT(vfsp
->vfs_count
!= 0);
4302 * Decrements the vfs reference count by one atomically. When
4303 * vfs reference count becomes zero, it calls the file system
4304 * specific vfs_freevfs() to free up the resources.
4307 vfs_rele(vfs_t
*vfsp
)
4309 ASSERT(vfsp
->vfs_count
!= 0);
4310 if (atomic_dec_32_nv(&vfsp
->vfs_count
) == 0) {
4314 zone_rele_ref(&vfsp
->vfs_implp
->vi_zone_ref
,
4316 vfs_freemnttab(vfsp
);
4322 * Generic operations vector support.
4324 * This is used to build operations vectors for both the vfs and vnode.
4325 * It's normally called only when a file system is loaded.
4327 * There are many possible algorithms for this, including the following:
4329 * (1) scan the list of known operations; for each, see if the file system
4330 * includes an entry for it, and fill it in as appropriate.
4332 * (2) set up defaults for all known operations. scan the list of ops
4333 * supplied by the file system; for each which is both supplied and
4334 * known, fill it in.
4336 * (3) sort the lists of known ops & supplied ops; scan the list, filling
4337 * in entries as we go.
4339 * we choose (1) for simplicity, and because performance isn't critical here.
4340 * note that (2) could be sped up using a precomputed hash table on known ops.
4341 * (3) could be faster than either, but only if the lists were very large or
4342 * supplied in sorted order.
4347 fs_build_vector(void *vector
, int *unused_ops
,
4348 const fs_operation_trans_def_t
*translation
,
4349 const fs_operation_def_t
*operations
)
4351 int i
, num_trans
, num_ops
, used
;
4354 * Count the number of translations and the number of supplied
4359 const fs_operation_trans_def_t
*p
;
4361 for (num_trans
= 0, p
= translation
;
4368 const fs_operation_def_t
*p
;
4370 for (num_ops
= 0, p
= operations
;
4376 /* Walk through each operation known to our caller. There will be */
4377 /* one entry in the supplied "translation table" for each. */
4381 for (i
= 0; i
< num_trans
; i
++) {
4384 fs_generic_func_p result
;
4385 fs_generic_func_p
*location
;
4387 curname
= translation
[i
].name
;
4389 /* Look for a matching operation in the list supplied by the */
4394 for (j
= 0; j
< num_ops
; j
++) {
4395 if (strcmp(operations
[j
].name
, curname
) == 0) {
4403 * If the file system is using a "placeholder" for default
4404 * or error functions, grab the appropriate function out of
4405 * the translation table. If the file system didn't supply
4406 * this operation at all, use the default function.
4410 result
= operations
[j
].func
.fs_generic
;
4411 if (result
== fs_default
) {
4412 result
= translation
[i
].defaultFunc
;
4413 } else if (result
== fs_error
) {
4414 result
= translation
[i
].errorFunc
;
4415 } else if (result
== NULL
) {
4416 /* Null values are PROHIBITED */
4420 result
= translation
[i
].defaultFunc
;
4423 /* Now store the function into the operations vector. */
4425 location
= (fs_generic_func_p
*)
4426 (((char *)vector
) + translation
[i
].offset
);
4431 *unused_ops
= num_ops
- used
;
4436 /* Placeholder functions, should never be called. */
4441 cmn_err(CE_PANIC
, "fs_error called");
4448 cmn_err(CE_PANIC
, "fs_default called");
4455 * Part of the implementation of booting off a mirrored root
4456 * involves a change of dev_t for the root device. To
4457 * accomplish this, first remove the existing hash table
4458 * entry for the root device, convert to the new dev_t,
4459 * then re-insert in the hash table at the head of the list.
4462 vfs_root_redev(vfs_t
*vfsp
, dev_t ndev
, int fstype
)
4466 vfs_hash_remove(vfsp
);
4468 vfsp
->vfs_dev
= ndev
;
4469 vfs_make_fsid(&vfsp
->vfs_fsid
, ndev
, fstype
);
4471 vfs_hash_add(vfsp
, 1);
4476 #else /* x86 NEWBOOT */
4479 extern int hvmboot_rootconf();
4482 extern ib_boot_prop_t
*iscsiboot_prop
;
4489 extern void pm_init();
4490 char *fstyp
, *fsmod
;
4493 getrootfs(&fstyp
, &fsmod
);
4497 * hvmboot_rootconf() is defined in the hvm_bootstrap misc module,
4498 * which lives in /platform/i86hvm, and hence is only available when
4499 * booted in an x86 hvm environment. If the hvm_bootstrap misc module
4500 * is not available then the modstub for this function will return 0.
4501 * If the hvm_bootstrap misc module is available it will be loaded
4502 * and hvmboot_rootconf() will be invoked.
4504 if (error
= hvmboot_rootconf())
4508 if (error
= clboot_rootconf())
4511 if (modload("fs", fsmod
) == -1)
4512 panic("Cannot _init %s module", fsmod
);
4515 vsw
= vfs_getvfsswbyname(fstyp
);
4518 cmn_err(CE_CONT
, "Cannot find %s filesystem\n", fstyp
);
4521 VFS_INIT(rootvfs
, &vsw
->vsw_vfsops
, 0);
4524 /* always mount readonly first */
4525 rootvfs
->vfs_flag
|= VFS_RDONLY
;
4529 if (netboot
&& iscsiboot_prop
) {
4530 cmn_err(CE_WARN
, "NFS boot and iSCSI boot"
4531 " shouldn't happen in the same time");
4535 if (netboot
|| iscsiboot_prop
) {
4538 cmn_err(CE_WARN
, "Cannot plumb network device %d", ret
);
4543 if ((ret
== 0) && iscsiboot_prop
) {
4544 ret
= modload("drv", "iscsi");
4545 /* -1 indicates fail */
4547 cmn_err(CE_WARN
, "Failed to load iscsi module");
4548 iscsi_boot_prop_free();
4551 if (!i_ddi_attach_pseudo_node("iscsi")) {
4553 "Failed to attach iscsi driver");
4554 iscsi_boot_prop_free();
4560 error
= VFS_MOUNTROOT(rootvfs
, ROOT_INIT
);
4561 vfs_unrefvfssw(vsw
);
4562 rootdev
= rootvfs
->vfs_dev
;
4565 cmn_err(CE_CONT
, "Cannot mount root on %s fstype %s\n",
4566 rootfs
.bo_name
, fstyp
);
4568 cmn_err(CE_CONT
, "?root on %s fstype %s\n",
4569 rootfs
.bo_name
, fstyp
);
4574 * XXX this is called by nfs only and should probably be removed
4575 * If booted with ASKNAME, prompt on the console for a filesystem
4576 * name and return it.
4579 getfsname(char *askfor
, char *name
, size_t namelen
)
4581 if (boothowto
& RB_ASKNAME
) {
4582 printf("%s name: ", askfor
);
4583 console_gets(name
, namelen
);
4588 * Init the root filesystem type (rootfs.bo_fstype) from the "fstype"
4591 * Filesystem types starting with the prefix "nfs" are diskless clients;
4592 * init the root filename name (rootfs.bo_name), too.
4594 * If we are booting via NFS we currently have these options:
4595 * nfs - dynamically choose NFS V2, V3, or V4 (default)
4596 * nfs2 - force NFS V2
4597 * nfs3 - force NFS V3
4598 * nfs4 - force NFS V4
4599 * Because we need to maintain backward compatibility with the naming
4600 * convention that the NFS V2 filesystem name is "nfs" (see vfs_conf.c)
4601 * we need to map "nfs" => "nfsdyn" and "nfs2" => "nfs". The dynamic
4602 * nfs module will map the type back to either "nfs", "nfs3", or "nfs4".
4603 * This is only for root filesystems, all other uses will expect
4604 * that "nfs" == NFS V2.
4607 getrootfs(char **fstypp
, char **fsmodp
)
4609 char *propstr
= NULL
;
4612 * Check fstype property; for diskless it should be one of "nfs",
4613 * "nfs2", "nfs3" or "nfs4".
4615 if (ddi_prop_lookup_string(DDI_DEV_T_ANY
, ddi_root_node(),
4616 DDI_PROP_DONTPASS
, "fstype", &propstr
)
4618 (void) strncpy(rootfs
.bo_fstype
, propstr
, BO_MAXFSNAME
);
4619 ddi_prop_free(propstr
);
4622 * if the boot property 'fstype' is not set, but 'zfs-bootfs' is set,
4623 * assume the type of this root filesystem is 'zfs'.
4625 } else if (ddi_prop_lookup_string(DDI_DEV_T_ANY
, ddi_root_node(),
4626 DDI_PROP_DONTPASS
, "zfs-bootfs", &propstr
)
4628 (void) strncpy(rootfs
.bo_fstype
, "zfs", BO_MAXFSNAME
);
4629 ddi_prop_free(propstr
);
4632 if (strncmp(rootfs
.bo_fstype
, "nfs", 3) != 0) {
4633 *fstypp
= *fsmodp
= rootfs
.bo_fstype
;
4639 if (strcmp(rootfs
.bo_fstype
, "nfs2") == 0)
4640 (void) strcpy(rootfs
.bo_fstype
, "nfs");
4641 else if (strcmp(rootfs
.bo_fstype
, "nfs") == 0)
4642 (void) strcpy(rootfs
.bo_fstype
, "nfsdyn");
4645 * check if path to network interface is specified in bootpath
4646 * or by a hypervisor domain configuration file.
4647 * XXPV - enable strlumb_get_netdev_path()
4649 if (ddi_prop_exists(DDI_DEV_T_ANY
, ddi_root_node(), DDI_PROP_DONTPASS
,
4651 (void) strcpy(rootfs
.bo_name
, "/xpvd/xnf@0");
4652 } else if (ddi_prop_lookup_string(DDI_DEV_T_ANY
, ddi_root_node(),
4653 DDI_PROP_DONTPASS
, "bootpath", &propstr
)
4655 (void) strncpy(rootfs
.bo_name
, propstr
, BO_MAXOBJNAME
);
4656 ddi_prop_free(propstr
);
4658 rootfs
.bo_name
[0] = '\0';
4660 *fstypp
= rootfs
.bo_fstype
;
4666 * VFS feature routines
4669 #define VFTINDEX(feature) (((feature) >> 32) & 0xFFFFFFFF)
4670 #define VFTBITS(feature) ((feature) & 0xFFFFFFFFLL)
4672 /* Register a feature in the vfs */
4674 vfs_set_feature(vfs_t
*vfsp
, vfs_feature_t feature
)
4676 /* Note that vfs_featureset[] is found in *vfsp->vfs_implp */
4677 if (vfsp
->vfs_implp
== NULL
)
4680 vfsp
->vfs_featureset
[VFTINDEX(feature
)] |= VFTBITS(feature
);
4684 vfs_clear_feature(vfs_t
*vfsp
, vfs_feature_t feature
)
4686 /* Note that vfs_featureset[] is found in *vfsp->vfs_implp */
4687 if (vfsp
->vfs_implp
== NULL
)
4689 vfsp
->vfs_featureset
[VFTINDEX(feature
)] &= VFTBITS(~feature
);
4693 * Query a vfs for a feature.
4694 * Returns 1 if feature is present, 0 if not
4697 vfs_has_feature(vfs_t
*vfsp
, vfs_feature_t feature
)
4701 /* Note that vfs_featureset[] is found in *vfsp->vfs_implp */
4702 if (vfsp
->vfs_implp
== NULL
)
4705 if (vfsp
->vfs_featureset
[VFTINDEX(feature
)] & VFTBITS(feature
))
4712 * Propagate feature set from one vfs to another
4715 vfs_propagate_features(vfs_t
*from
, vfs_t
*to
)
4719 if (to
->vfs_implp
== NULL
|| from
->vfs_implp
== NULL
)
4722 for (i
= 1; i
<= to
->vfs_featureset
[0]; i
++) {
4723 to
->vfs_featureset
[i
] = from
->vfs_featureset
[i
];
4727 #define LOFINODE_PATH "/dev/lofi/%d"
4730 * Return the vnode for the lofi node if there's a lofi mount in place.
4731 * Returns -1 when there's no lofi node, 0 on success, and > 0 on
4735 vfs_get_lofi(vfs_t
*vfsp
, vnode_t
**vpp
)
4741 if (vfsp
->vfs_lofi_id
== 0) {
4746 strsize
= snprintf(NULL
, 0, LOFINODE_PATH
, vfsp
->vfs_lofi_id
);
4747 path
= kmem_alloc(strsize
+ 1, KM_SLEEP
);
4748 (void) snprintf(path
, strsize
+ 1, LOFINODE_PATH
, vfsp
->vfs_lofi_id
);
4751 * We may be inside a zone, so we need to use the /dev path, but
4752 * it's created asynchronously, so we wait here.
4755 err
= lookupname(path
, UIO_SYSSPACE
, FOLLOW
, NULLVPP
, vpp
);
4760 if ((err
= delay_sig(hz
/ 8)) == EINTR
)
4767 kmem_free(path
, strsize
+ 1);