1/* $NetBSD: tmpfs_vfsops.c,v 1.10 2005/12/11 12:24:29 christos Exp $ */
2
3/*-
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9 * 2005 program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * Efficient memory file system.
35 *
36 * tmpfs is a file system that uses NetBSD's virtual memory sub-system
37 * (the well-known UVM) to store file data and metadata in an efficient
38 * way. This means that it does not follow the structure of an on-disk
39 * file system because it simply does not need to. Instead, it uses
40 * memory-specific data structures and algorithms to automatically
41 * allocate and release resources.
42 */
43#include <sys/cdefs.h>
| 1/* $NetBSD: tmpfs_vfsops.c,v 1.10 2005/12/11 12:24:29 christos Exp $ */
2
3/*-
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9 * 2005 program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * Efficient memory file system.
35 *
36 * tmpfs is a file system that uses NetBSD's virtual memory sub-system
37 * (the well-known UVM) to store file data and metadata in an efficient
38 * way. This means that it does not follow the structure of an on-disk
39 * file system because it simply does not need to. Instead, it uses
40 * memory-specific data structures and algorithms to automatically
41 * allocate and release resources.
42 */
43#include <sys/cdefs.h>
|
44__FBSDID("$FreeBSD: stable/10/sys/fs/tmpfs/tmpfs_vfsops.c 269164 2014-07-28 00:43:42Z kib $");
| 44__FBSDID("$FreeBSD: stable/10/sys/fs/tmpfs/tmpfs_vfsops.c 269175 2014-07-28 01:23:59Z kib $");
|
45
46#include <sys/param.h>
47#include <sys/limits.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50#include <sys/proc.h>
51#include <sys/jail.h>
52#include <sys/kernel.h>
53#include <sys/stat.h>
54#include <sys/systm.h>
55#include <sys/sysctl.h>
56
57#include <vm/vm.h>
58#include <vm/vm_object.h>
59#include <vm/vm_param.h>
60
61#include <fs/tmpfs/tmpfs.h>
62
63/*
64 * Default permission for root node
65 */
66#define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
67
68MALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures");
69MALLOC_DEFINE(M_TMPFSNAME, "tmpfs name", "tmpfs file names");
70
71static int tmpfs_mount(struct mount *);
72static int tmpfs_unmount(struct mount *, int);
73static int tmpfs_root(struct mount *, int flags, struct vnode **);
74static int tmpfs_fhtovp(struct mount *, struct fid *, int,
75 struct vnode **);
76static int tmpfs_statfs(struct mount *, struct statfs *);
77
78static const char *tmpfs_opts[] = {
79 "from", "size", "maxfilesize", "inodes", "uid", "gid", "mode", "export",
80 "union", NULL
81};
82
83static const char *tmpfs_updateopts[] = {
84 "from", "export", NULL
85};
86
87static int
88tmpfs_node_ctor(void *mem, int size, void *arg, int flags)
89{
90 struct tmpfs_node *node = (struct tmpfs_node *)mem;
91
92 node->tn_gen++;
93 node->tn_size = 0;
94 node->tn_status = 0;
95 node->tn_flags = 0;
96 node->tn_links = 0;
97 node->tn_vnode = NULL;
98 node->tn_vpstate = 0;
99
100 return (0);
101}
102
103static void
104tmpfs_node_dtor(void *mem, int size, void *arg)
105{
106 struct tmpfs_node *node = (struct tmpfs_node *)mem;
107 node->tn_type = VNON;
108}
109
110static int
111tmpfs_node_init(void *mem, int size, int flags)
112{
113 struct tmpfs_node *node = (struct tmpfs_node *)mem;
114 node->tn_id = 0;
115
116 mtx_init(&node->tn_interlock, "tmpfs node interlock", NULL, MTX_DEF);
117 node->tn_gen = arc4random();
118
119 return (0);
120}
121
122static void
123tmpfs_node_fini(void *mem, int size)
124{
125 struct tmpfs_node *node = (struct tmpfs_node *)mem;
126
127 mtx_destroy(&node->tn_interlock);
128}
129
130static int
131tmpfs_mount(struct mount *mp)
132{
133 const size_t nodes_per_page = howmany(PAGE_SIZE,
134 sizeof(struct tmpfs_dirent) + sizeof(struct tmpfs_node));
135 struct tmpfs_mount *tmp;
136 struct tmpfs_node *root;
137 struct thread *td = curthread;
138 int error;
139 /* Size counters. */
140 u_quad_t pages;
141 off_t nodes_max, size_max, maxfilesize;
142
143 /* Root node attributes. */
144 uid_t root_uid;
145 gid_t root_gid;
146 mode_t root_mode;
147
148 struct vattr va;
149
150 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_TMPFS))
151 return (EPERM);
152
153 if (vfs_filteropt(mp->mnt_optnew, tmpfs_opts))
154 return (EINVAL);
155
156 if (mp->mnt_flag & MNT_UPDATE) {
157 /* Only support update mounts for certain options. */
158 if (vfs_filteropt(mp->mnt_optnew, tmpfs_updateopts) != 0)
159 return (EOPNOTSUPP);
160 if (vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) !=
161 ((struct tmpfs_mount *)mp->mnt_data)->tm_ronly)
162 return (EOPNOTSUPP);
163 return (0);
164 }
165
166 vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY);
167 error = VOP_GETATTR(mp->mnt_vnodecovered, &va, mp->mnt_cred);
168 VOP_UNLOCK(mp->mnt_vnodecovered, 0);
169 if (error)
170 return (error);
171
172 if (mp->mnt_cred->cr_ruid != 0 ||
173 vfs_scanopt(mp->mnt_optnew, "gid", "%d", &root_gid) != 1)
174 root_gid = va.va_gid;
175 if (mp->mnt_cred->cr_ruid != 0 ||
176 vfs_scanopt(mp->mnt_optnew, "uid", "%d", &root_uid) != 1)
177 root_uid = va.va_uid;
178 if (mp->mnt_cred->cr_ruid != 0 ||
179 vfs_scanopt(mp->mnt_optnew, "mode", "%ho", &root_mode) != 1)
180 root_mode = va.va_mode;
181 if (vfs_getopt_size(mp->mnt_optnew, "inodes", &nodes_max) != 0)
182 nodes_max = 0;
183 if (vfs_getopt_size(mp->mnt_optnew, "size", &size_max) != 0)
184 size_max = 0;
185 if (vfs_getopt_size(mp->mnt_optnew, "maxfilesize", &maxfilesize) != 0)
186 maxfilesize = 0;
187
188 /* Do not allow mounts if we do not have enough memory to preserve
189 * the minimum reserved pages. */
190 if (tmpfs_mem_avail() < TMPFS_PAGES_MINRESERVED)
191 return ENOSPC;
192
193 /* Get the maximum number of memory pages this file system is
194 * allowed to use, based on the maximum size the user passed in
195 * the mount structure. A value of zero is treated as if the
196 * maximum available space was requested. */
197 if (size_max == 0 || size_max > OFF_MAX - PAGE_SIZE ||
198 (SIZE_MAX < OFF_MAX && size_max / PAGE_SIZE >= SIZE_MAX))
199 pages = SIZE_MAX;
200 else {
201 size_max = roundup(size_max, PAGE_SIZE);
202 pages = howmany(size_max, PAGE_SIZE);
203 }
204 MPASS(pages > 0);
205
206 if (nodes_max <= 3) {
207 if (pages < INT_MAX / nodes_per_page)
208 nodes_max = pages * nodes_per_page;
209 else
210 nodes_max = INT_MAX;
211 }
212 if (nodes_max > INT_MAX)
213 nodes_max = INT_MAX;
214 MPASS(nodes_max >= 3);
215
216 /* Allocate the tmpfs mount structure and fill it. */
217 tmp = (struct tmpfs_mount *)malloc(sizeof(struct tmpfs_mount),
218 M_TMPFSMNT, M_WAITOK | M_ZERO);
219
220 mtx_init(&tmp->allnode_lock, "tmpfs allnode lock", NULL, MTX_DEF);
221 tmp->tm_nodes_max = nodes_max;
222 tmp->tm_nodes_inuse = 0;
223 tmp->tm_maxfilesize = maxfilesize > 0 ? maxfilesize : OFF_MAX;
224 LIST_INIT(&tmp->tm_nodes_used);
225
226 tmp->tm_pages_max = pages;
227 tmp->tm_pages_used = 0;
228 tmp->tm_ino_unr = new_unrhdr(2, INT_MAX, &tmp->allnode_lock);
229 tmp->tm_dirent_pool = uma_zcreate("TMPFS dirent",
230 sizeof(struct tmpfs_dirent),
231 NULL, NULL, NULL, NULL,
232 UMA_ALIGN_PTR, 0);
233 tmp->tm_node_pool = uma_zcreate("TMPFS node",
234 sizeof(struct tmpfs_node),
235 tmpfs_node_ctor, tmpfs_node_dtor,
236 tmpfs_node_init, tmpfs_node_fini,
237 UMA_ALIGN_PTR, 0);
238 tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
239
240 /* Allocate the root node. */
| 45
46#include <sys/param.h>
47#include <sys/limits.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50#include <sys/proc.h>
51#include <sys/jail.h>
52#include <sys/kernel.h>
53#include <sys/stat.h>
54#include <sys/systm.h>
55#include <sys/sysctl.h>
56
57#include <vm/vm.h>
58#include <vm/vm_object.h>
59#include <vm/vm_param.h>
60
61#include <fs/tmpfs/tmpfs.h>
62
63/*
64 * Default permission for root node
65 */
66#define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
67
68MALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures");
69MALLOC_DEFINE(M_TMPFSNAME, "tmpfs name", "tmpfs file names");
70
71static int tmpfs_mount(struct mount *);
72static int tmpfs_unmount(struct mount *, int);
73static int tmpfs_root(struct mount *, int flags, struct vnode **);
74static int tmpfs_fhtovp(struct mount *, struct fid *, int,
75 struct vnode **);
76static int tmpfs_statfs(struct mount *, struct statfs *);
77
78static const char *tmpfs_opts[] = {
79 "from", "size", "maxfilesize", "inodes", "uid", "gid", "mode", "export",
80 "union", NULL
81};
82
83static const char *tmpfs_updateopts[] = {
84 "from", "export", NULL
85};
86
87static int
88tmpfs_node_ctor(void *mem, int size, void *arg, int flags)
89{
90 struct tmpfs_node *node = (struct tmpfs_node *)mem;
91
92 node->tn_gen++;
93 node->tn_size = 0;
94 node->tn_status = 0;
95 node->tn_flags = 0;
96 node->tn_links = 0;
97 node->tn_vnode = NULL;
98 node->tn_vpstate = 0;
99
100 return (0);
101}
102
103static void
104tmpfs_node_dtor(void *mem, int size, void *arg)
105{
106 struct tmpfs_node *node = (struct tmpfs_node *)mem;
107 node->tn_type = VNON;
108}
109
110static int
111tmpfs_node_init(void *mem, int size, int flags)
112{
113 struct tmpfs_node *node = (struct tmpfs_node *)mem;
114 node->tn_id = 0;
115
116 mtx_init(&node->tn_interlock, "tmpfs node interlock", NULL, MTX_DEF);
117 node->tn_gen = arc4random();
118
119 return (0);
120}
121
122static void
123tmpfs_node_fini(void *mem, int size)
124{
125 struct tmpfs_node *node = (struct tmpfs_node *)mem;
126
127 mtx_destroy(&node->tn_interlock);
128}
129
130static int
131tmpfs_mount(struct mount *mp)
132{
133 const size_t nodes_per_page = howmany(PAGE_SIZE,
134 sizeof(struct tmpfs_dirent) + sizeof(struct tmpfs_node));
135 struct tmpfs_mount *tmp;
136 struct tmpfs_node *root;
137 struct thread *td = curthread;
138 int error;
139 /* Size counters. */
140 u_quad_t pages;
141 off_t nodes_max, size_max, maxfilesize;
142
143 /* Root node attributes. */
144 uid_t root_uid;
145 gid_t root_gid;
146 mode_t root_mode;
147
148 struct vattr va;
149
150 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_TMPFS))
151 return (EPERM);
152
153 if (vfs_filteropt(mp->mnt_optnew, tmpfs_opts))
154 return (EINVAL);
155
156 if (mp->mnt_flag & MNT_UPDATE) {
157 /* Only support update mounts for certain options. */
158 if (vfs_filteropt(mp->mnt_optnew, tmpfs_updateopts) != 0)
159 return (EOPNOTSUPP);
160 if (vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) !=
161 ((struct tmpfs_mount *)mp->mnt_data)->tm_ronly)
162 return (EOPNOTSUPP);
163 return (0);
164 }
165
166 vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY);
167 error = VOP_GETATTR(mp->mnt_vnodecovered, &va, mp->mnt_cred);
168 VOP_UNLOCK(mp->mnt_vnodecovered, 0);
169 if (error)
170 return (error);
171
172 if (mp->mnt_cred->cr_ruid != 0 ||
173 vfs_scanopt(mp->mnt_optnew, "gid", "%d", &root_gid) != 1)
174 root_gid = va.va_gid;
175 if (mp->mnt_cred->cr_ruid != 0 ||
176 vfs_scanopt(mp->mnt_optnew, "uid", "%d", &root_uid) != 1)
177 root_uid = va.va_uid;
178 if (mp->mnt_cred->cr_ruid != 0 ||
179 vfs_scanopt(mp->mnt_optnew, "mode", "%ho", &root_mode) != 1)
180 root_mode = va.va_mode;
181 if (vfs_getopt_size(mp->mnt_optnew, "inodes", &nodes_max) != 0)
182 nodes_max = 0;
183 if (vfs_getopt_size(mp->mnt_optnew, "size", &size_max) != 0)
184 size_max = 0;
185 if (vfs_getopt_size(mp->mnt_optnew, "maxfilesize", &maxfilesize) != 0)
186 maxfilesize = 0;
187
188 /* Do not allow mounts if we do not have enough memory to preserve
189 * the minimum reserved pages. */
190 if (tmpfs_mem_avail() < TMPFS_PAGES_MINRESERVED)
191 return ENOSPC;
192
193 /* Get the maximum number of memory pages this file system is
194 * allowed to use, based on the maximum size the user passed in
195 * the mount structure. A value of zero is treated as if the
196 * maximum available space was requested. */
197 if (size_max == 0 || size_max > OFF_MAX - PAGE_SIZE ||
198 (SIZE_MAX < OFF_MAX && size_max / PAGE_SIZE >= SIZE_MAX))
199 pages = SIZE_MAX;
200 else {
201 size_max = roundup(size_max, PAGE_SIZE);
202 pages = howmany(size_max, PAGE_SIZE);
203 }
204 MPASS(pages > 0);
205
206 if (nodes_max <= 3) {
207 if (pages < INT_MAX / nodes_per_page)
208 nodes_max = pages * nodes_per_page;
209 else
210 nodes_max = INT_MAX;
211 }
212 if (nodes_max > INT_MAX)
213 nodes_max = INT_MAX;
214 MPASS(nodes_max >= 3);
215
216 /* Allocate the tmpfs mount structure and fill it. */
217 tmp = (struct tmpfs_mount *)malloc(sizeof(struct tmpfs_mount),
218 M_TMPFSMNT, M_WAITOK | M_ZERO);
219
220 mtx_init(&tmp->allnode_lock, "tmpfs allnode lock", NULL, MTX_DEF);
221 tmp->tm_nodes_max = nodes_max;
222 tmp->tm_nodes_inuse = 0;
223 tmp->tm_maxfilesize = maxfilesize > 0 ? maxfilesize : OFF_MAX;
224 LIST_INIT(&tmp->tm_nodes_used);
225
226 tmp->tm_pages_max = pages;
227 tmp->tm_pages_used = 0;
228 tmp->tm_ino_unr = new_unrhdr(2, INT_MAX, &tmp->allnode_lock);
229 tmp->tm_dirent_pool = uma_zcreate("TMPFS dirent",
230 sizeof(struct tmpfs_dirent),
231 NULL, NULL, NULL, NULL,
232 UMA_ALIGN_PTR, 0);
233 tmp->tm_node_pool = uma_zcreate("TMPFS node",
234 sizeof(struct tmpfs_node),
235 tmpfs_node_ctor, tmpfs_node_dtor,
236 tmpfs_node_init, tmpfs_node_fini,
237 UMA_ALIGN_PTR, 0);
238 tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
239
240 /* Allocate the root node. */
|
241 error = tmpfs_alloc_node(tmp, VDIR, root_uid,
| 241 error = tmpfs_alloc_node(mp, tmp, VDIR, root_uid,
|
242 root_gid, root_mode & ALLPERMS, NULL, NULL,
243 VNOVAL, &root);
244
245 if (error != 0 || root == NULL) {
246 uma_zdestroy(tmp->tm_node_pool);
247 uma_zdestroy(tmp->tm_dirent_pool);
248 delete_unrhdr(tmp->tm_ino_unr);
249 free(tmp, M_TMPFSMNT);
250 return error;
251 }
252 KASSERT(root->tn_id == 2,
253 ("tmpfs root with invalid ino: %ju", (uintmax_t)root->tn_id));
254 tmp->tm_root = root;
255
256 MNT_ILOCK(mp);
257 mp->mnt_flag |= MNT_LOCAL;
258 MNT_IUNLOCK(mp);
259
260 mp->mnt_data = tmp;
261 mp->mnt_stat.f_namemax = MAXNAMLEN;
262 vfs_getnewfsid(mp);
263 vfs_mountedfrom(mp, "tmpfs");
264
265 return 0;
266}
267
268/* ARGSUSED2 */
269static int
270tmpfs_unmount(struct mount *mp, int mntflags)
271{
| 242 root_gid, root_mode & ALLPERMS, NULL, NULL,
243 VNOVAL, &root);
244
245 if (error != 0 || root == NULL) {
246 uma_zdestroy(tmp->tm_node_pool);
247 uma_zdestroy(tmp->tm_dirent_pool);
248 delete_unrhdr(tmp->tm_ino_unr);
249 free(tmp, M_TMPFSMNT);
250 return error;
251 }
252 KASSERT(root->tn_id == 2,
253 ("tmpfs root with invalid ino: %ju", (uintmax_t)root->tn_id));
254 tmp->tm_root = root;
255
256 MNT_ILOCK(mp);
257 mp->mnt_flag |= MNT_LOCAL;
258 MNT_IUNLOCK(mp);
259
260 mp->mnt_data = tmp;
261 mp->mnt_stat.f_namemax = MAXNAMLEN;
262 vfs_getnewfsid(mp);
263 vfs_mountedfrom(mp, "tmpfs");
264
265 return 0;
266}
267
268/* ARGSUSED2 */
269static int
270tmpfs_unmount(struct mount *mp, int mntflags)
271{
|
272 int error;
273 int flags = 0;
| |
274 struct tmpfs_mount *tmp;
275 struct tmpfs_node *node;
| 272 struct tmpfs_mount *tmp;
273 struct tmpfs_node *node;
|
| 274 int error, flags;
|
276
| 275
|
277 /* Handle forced unmounts. */
278 if (mntflags & MNT_FORCE)
279 flags |= FORCECLOSE;
| 276 flags = (mntflags & MNT_FORCE) != 0 ? FORCECLOSE : 0;
277 tmp = VFS_TO_TMPFS(mp);
|
280
| 278
|
281 /* Finalize all pending I/O. */
282 error = vflush(mp, 0, flags, curthread);
| 279 /* Stop writers */
280 error = vfs_write_suspend_umnt(mp);
|
283 if (error != 0)
| 281 if (error != 0)
|
284 return error;
| 282 return (error);
283 /*
284 * At this point, nodes cannot be destroyed by any other
285 * thread because write suspension is started.
286 */
|
285
| 287
|
286 tmp = VFS_TO_TMPFS(mp);
| 288 for (;;) {
289 error = vflush(mp, 0, flags, curthread);
290 if (error != 0) {
291 vfs_write_resume(mp, VR_START_WRITE);
292 return (error);
293 }
294 MNT_ILOCK(mp);
295 if (mp->mnt_nvnodelistsize == 0) {
296 MNT_IUNLOCK(mp);
297 break;
298 }
299 MNT_IUNLOCK(mp);
300 if ((mntflags & MNT_FORCE) == 0) {
301 vfs_write_resume(mp, VR_START_WRITE);
302 return (EBUSY);
303 }
304 }
|
287
| 305
|
288 /* Free all associated data. The loop iterates over the linked list
289 * we have containing all used nodes. For each of them that is
290 * a directory, we free all its directory entries. Note that after
291 * freeing a node, it will automatically go to the available list,
292 * so we will later have to iterate over it to release its items. */
293 node = LIST_FIRST(&tmp->tm_nodes_used);
294 while (node != NULL) {
295 struct tmpfs_node *next;
296
| 306 TMPFS_LOCK(tmp);
307 while ((node = LIST_FIRST(&tmp->tm_nodes_used)) != NULL) {
308 TMPFS_UNLOCK(tmp);
|
297 if (node->tn_type == VDIR)
298 tmpfs_dir_destroy(tmp, node);
| 309 if (node->tn_type == VDIR)
310 tmpfs_dir_destroy(tmp, node);
|
299
300 next = LIST_NEXT(node, tn_entries);
| |
301 tmpfs_free_node(tmp, node);
| 311 tmpfs_free_node(tmp, node);
|
302 node = next;
| 312 TMPFS_LOCK(tmp);
|
303 }
| 313 }
|
| 314 TMPFS_UNLOCK(tmp);
|
304
305 uma_zdestroy(tmp->tm_dirent_pool);
306 uma_zdestroy(tmp->tm_node_pool);
307 delete_unrhdr(tmp->tm_ino_unr);
308
309 mtx_destroy(&tmp->allnode_lock);
310 MPASS(tmp->tm_pages_used == 0);
311 MPASS(tmp->tm_nodes_inuse == 0);
312
313 /* Throw away the tmpfs_mount structure. */
314 free(mp->mnt_data, M_TMPFSMNT);
315 mp->mnt_data = NULL;
| 315
316 uma_zdestroy(tmp->tm_dirent_pool);
317 uma_zdestroy(tmp->tm_node_pool);
318 delete_unrhdr(tmp->tm_ino_unr);
319
320 mtx_destroy(&tmp->allnode_lock);
321 MPASS(tmp->tm_pages_used == 0);
322 MPASS(tmp->tm_nodes_inuse == 0);
323
324 /* Throw away the tmpfs_mount structure. */
325 free(mp->mnt_data, M_TMPFSMNT);
326 mp->mnt_data = NULL;
|
| 327 vfs_write_resume(mp, VR_START_WRITE);
|
316
317 MNT_ILOCK(mp);
318 mp->mnt_flag &= ~MNT_LOCAL;
319 MNT_IUNLOCK(mp);
| 328
329 MNT_ILOCK(mp);
330 mp->mnt_flag &= ~MNT_LOCAL;
331 MNT_IUNLOCK(mp);
|
320 return 0;
| 332
333 return (0);
|
321}
322
323static int
324tmpfs_root(struct mount *mp, int flags, struct vnode **vpp)
325{
326 int error;
327 error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp);
328
329 if (!error)
330 (*vpp)->v_vflag |= VV_ROOT;
331
332 return error;
333}
334
335static int
336tmpfs_fhtovp(struct mount *mp, struct fid *fhp, int flags,
337 struct vnode **vpp)
338{
339 boolean_t found;
340 struct tmpfs_fid *tfhp;
341 struct tmpfs_mount *tmp;
342 struct tmpfs_node *node;
343
344 tmp = VFS_TO_TMPFS(mp);
345
346 tfhp = (struct tmpfs_fid *)fhp;
347 if (tfhp->tf_len != sizeof(struct tmpfs_fid))
348 return EINVAL;
349
350 if (tfhp->tf_id >= tmp->tm_nodes_max)
351 return EINVAL;
352
353 found = FALSE;
354
355 TMPFS_LOCK(tmp);
356 LIST_FOREACH(node, &tmp->tm_nodes_used, tn_entries) {
357 if (node->tn_id == tfhp->tf_id &&
358 node->tn_gen == tfhp->tf_gen) {
359 found = TRUE;
360 break;
361 }
362 }
363 TMPFS_UNLOCK(tmp);
364
365 if (found)
366 return (tmpfs_alloc_vp(mp, node, LK_EXCLUSIVE, vpp));
367
368 return (EINVAL);
369}
370
371/* ARGSUSED2 */
372static int
373tmpfs_statfs(struct mount *mp, struct statfs *sbp)
374{
375 struct tmpfs_mount *tmp;
376 size_t used;
377
378 tmp = VFS_TO_TMPFS(mp);
379
380 sbp->f_iosize = PAGE_SIZE;
381 sbp->f_bsize = PAGE_SIZE;
382
383 used = tmpfs_pages_used(tmp);
384 if (tmp->tm_pages_max != SIZE_MAX)
385 sbp->f_blocks = tmp->tm_pages_max;
386 else
387 sbp->f_blocks = used + tmpfs_mem_avail();
388 if (sbp->f_blocks <= used)
389 sbp->f_bavail = 0;
390 else
391 sbp->f_bavail = sbp->f_blocks - used;
392 sbp->f_bfree = sbp->f_bavail;
393 used = tmp->tm_nodes_inuse;
394 sbp->f_files = tmp->tm_nodes_max;
395 if (sbp->f_files <= used)
396 sbp->f_ffree = 0;
397 else
398 sbp->f_ffree = sbp->f_files - used;
399 /* sbp->f_owner = tmp->tn_uid; */
400
401 return 0;
402}
403
| 334}
335
336static int
337tmpfs_root(struct mount *mp, int flags, struct vnode **vpp)
338{
339 int error;
340 error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp);
341
342 if (!error)
343 (*vpp)->v_vflag |= VV_ROOT;
344
345 return error;
346}
347
348static int
349tmpfs_fhtovp(struct mount *mp, struct fid *fhp, int flags,
350 struct vnode **vpp)
351{
352 boolean_t found;
353 struct tmpfs_fid *tfhp;
354 struct tmpfs_mount *tmp;
355 struct tmpfs_node *node;
356
357 tmp = VFS_TO_TMPFS(mp);
358
359 tfhp = (struct tmpfs_fid *)fhp;
360 if (tfhp->tf_len != sizeof(struct tmpfs_fid))
361 return EINVAL;
362
363 if (tfhp->tf_id >= tmp->tm_nodes_max)
364 return EINVAL;
365
366 found = FALSE;
367
368 TMPFS_LOCK(tmp);
369 LIST_FOREACH(node, &tmp->tm_nodes_used, tn_entries) {
370 if (node->tn_id == tfhp->tf_id &&
371 node->tn_gen == tfhp->tf_gen) {
372 found = TRUE;
373 break;
374 }
375 }
376 TMPFS_UNLOCK(tmp);
377
378 if (found)
379 return (tmpfs_alloc_vp(mp, node, LK_EXCLUSIVE, vpp));
380
381 return (EINVAL);
382}
383
384/* ARGSUSED2 */
385static int
386tmpfs_statfs(struct mount *mp, struct statfs *sbp)
387{
388 struct tmpfs_mount *tmp;
389 size_t used;
390
391 tmp = VFS_TO_TMPFS(mp);
392
393 sbp->f_iosize = PAGE_SIZE;
394 sbp->f_bsize = PAGE_SIZE;
395
396 used = tmpfs_pages_used(tmp);
397 if (tmp->tm_pages_max != SIZE_MAX)
398 sbp->f_blocks = tmp->tm_pages_max;
399 else
400 sbp->f_blocks = used + tmpfs_mem_avail();
401 if (sbp->f_blocks <= used)
402 sbp->f_bavail = 0;
403 else
404 sbp->f_bavail = sbp->f_blocks - used;
405 sbp->f_bfree = sbp->f_bavail;
406 used = tmp->tm_nodes_inuse;
407 sbp->f_files = tmp->tm_nodes_max;
408 if (sbp->f_files <= used)
409 sbp->f_ffree = 0;
410 else
411 sbp->f_ffree = sbp->f_files - used;
412 /* sbp->f_owner = tmp->tn_uid; */
413
414 return 0;
415}
416
|
| 417static int
418tmpfs_sync(struct mount *mp, int waitfor)
419{
420
421 if (waitfor == MNT_SUSPEND) {
422 MNT_ILOCK(mp);
423 mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED;
424 MNT_IUNLOCK(mp);
425 }
426 return (0);
427}
428
|
404/*
405 * tmpfs vfs operations.
406 */
407
408struct vfsops tmpfs_vfsops = {
409 .vfs_mount = tmpfs_mount,
410 .vfs_unmount = tmpfs_unmount,
411 .vfs_root = tmpfs_root,
412 .vfs_statfs = tmpfs_statfs,
413 .vfs_fhtovp = tmpfs_fhtovp,
| 429/*
430 * tmpfs vfs operations.
431 */
432
433struct vfsops tmpfs_vfsops = {
434 .vfs_mount = tmpfs_mount,
435 .vfs_unmount = tmpfs_unmount,
436 .vfs_root = tmpfs_root,
437 .vfs_statfs = tmpfs_statfs,
438 .vfs_fhtovp = tmpfs_fhtovp,
|
| 439 .vfs_sync = tmpfs_sync,
|
414};
415VFS_SET(tmpfs_vfsops, tmpfs, VFCF_JAIL);
| 440};
441VFS_SET(tmpfs_vfsops, tmpfs, VFCF_JAIL);
|