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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
5 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
6 */
7
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/errno.h>
11#include <linux/fs.h>
12#include <linux/file.h>
13#include <linux/stat.h>
14#include <linux/string.h>
15#include <linux/inet.h>
16#include <linux/pagemap.h>
17#include <linux/mount.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/statfs.h>
21#include <linux/magic.h>
22#include <linux/fscache.h>
23#include <net/9p/9p.h>
24#include <net/9p/client.h>
25
26#include "v9fs.h"
27#include "v9fs_vfs.h"
28#include "fid.h"
29#include "xattr.h"
30#include "acl.h"
31
32static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
33
34/**
35 * v9fs_set_super - set the superblock
36 * @s: super block
37 * @data: file system specific data
38 *
39 */
40
41static int v9fs_set_super(struct super_block *s, void *data)
42{
43 s->s_fs_info = data;
44 return set_anon_super(s, data);
45}
46
47/**
48 * v9fs_fill_super - populate superblock with info
49 * @sb: superblock
50 * @v9ses: session information
51 * @flags: flags propagated from v9fs_mount()
52 *
53 */
54
55static int
56v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
57 int flags)
58{
59 int ret;
60
61 sb->s_maxbytes = MAX_LFS_FILESIZE;
62 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
63 sb->s_blocksize = 1 << sb->s_blocksize_bits;
64 sb->s_magic = V9FS_MAGIC;
65 if (v9fs_proto_dotl(v9ses)) {
66 sb->s_op = &v9fs_super_ops_dotl;
67 sb->s_xattr = v9fs_xattr_handlers;
68 } else {
69 sb->s_op = &v9fs_super_ops;
70 sb->s_time_max = U32_MAX;
71 }
72
73 sb->s_time_min = 0;
74
75 ret = super_setup_bdi(sb);
76 if (ret)
77 return ret;
78
79 if (!v9ses->cache) {
80 sb->s_bdi->ra_pages = 0;
81 sb->s_bdi->io_pages = 0;
82 } else {
83 sb->s_bdi->ra_pages = v9ses->maxdata >> PAGE_SHIFT;
84 sb->s_bdi->io_pages = v9ses->maxdata >> PAGE_SHIFT;
85 }
86
87 sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
88 if (!v9ses->cache)
89 sb->s_flags |= SB_SYNCHRONOUS;
90
91#ifdef CONFIG_9P_FS_POSIX_ACL
92 if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
93 sb->s_flags |= SB_POSIXACL;
94#endif
95
96 return 0;
97}
98
99/**
100 * v9fs_mount - mount a superblock
101 * @fs_type: file system type
102 * @flags: mount flags
103 * @dev_name: device name that was mounted
104 * @data: mount options
105 *
106 */
107
108static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
109 const char *dev_name, void *data)
110{
111 struct super_block *sb = NULL;
112 struct inode *inode = NULL;
113 struct dentry *root = NULL;
114 struct v9fs_session_info *v9ses = NULL;
115 umode_t mode = 0777 | S_ISVTX;
116 struct p9_fid *fid;
117 int retval = 0;
118
119 p9_debug(P9_DEBUG_VFS, "\n");
120
121 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
122 if (!v9ses)
123 return ERR_PTR(-ENOMEM);
124
125 fid = v9fs_session_init(v9ses, dev_name, data);
126 if (IS_ERR(fid)) {
127 retval = PTR_ERR(fid);
128 goto free_session;
129 }
130
131 sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
132 if (IS_ERR(sb)) {
133 retval = PTR_ERR(sb);
134 goto clunk_fid;
135 }
136 retval = v9fs_fill_super(sb, v9ses, flags);
137 if (retval)
138 goto release_sb;
139
140 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
141 sb->s_d_op = &v9fs_cached_dentry_operations;
142 else
143 sb->s_d_op = &v9fs_dentry_operations;
144
145 inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
146 if (IS_ERR(inode)) {
147 retval = PTR_ERR(inode);
148 goto release_sb;
149 }
150
151 root = d_make_root(inode);
152 if (!root) {
153 retval = -ENOMEM;
154 goto release_sb;
155 }
156 sb->s_root = root;
157 if (v9fs_proto_dotl(v9ses)) {
158 struct p9_stat_dotl *st = NULL;
159
160 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
161 if (IS_ERR(st)) {
162 retval = PTR_ERR(st);
163 goto release_sb;
164 }
165 d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
166 v9fs_stat2inode_dotl(st, d_inode(root), 0);
167 kfree(st);
168 } else {
169 struct p9_wstat *st = NULL;
170
171 st = p9_client_stat(fid);
172 if (IS_ERR(st)) {
173 retval = PTR_ERR(st);
174 goto release_sb;
175 }
176
177 d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
178 v9fs_stat2inode(st, d_inode(root), sb, 0);
179
180 p9stat_free(st);
181 kfree(st);
182 }
183 retval = v9fs_get_acl(inode, fid);
184 if (retval)
185 goto release_sb;
186 v9fs_fid_add(root, &fid);
187
188 p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
189 return dget(sb->s_root);
190
191clunk_fid:
192 p9_fid_put(fid);
193 v9fs_session_close(v9ses);
194free_session:
195 kfree(v9ses);
196 return ERR_PTR(retval);
197
198release_sb:
199 /*
200 * we will do the session_close and root dentry release
201 * in the below call. But we need to clunk fid, because we haven't
202 * attached the fid to dentry so it won't get clunked
203 * automatically.
204 */
205 p9_fid_put(fid);
206 deactivate_locked_super(sb);
207 return ERR_PTR(retval);
208}
209
210/**
211 * v9fs_kill_super - Kill Superblock
212 * @s: superblock
213 *
214 */
215
216static void v9fs_kill_super(struct super_block *s)
217{
218 struct v9fs_session_info *v9ses = s->s_fs_info;
219
220 p9_debug(P9_DEBUG_VFS, " %p\n", s);
221
222 kill_anon_super(s);
223
224 v9fs_session_cancel(v9ses);
225 v9fs_session_close(v9ses);
226 kfree(v9ses);
227 s->s_fs_info = NULL;
228 p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
229}
230
231static void
232v9fs_umount_begin(struct super_block *sb)
233{
234 struct v9fs_session_info *v9ses;
235
236 v9ses = sb->s_fs_info;
237 v9fs_session_begin_cancel(v9ses);
238}
239
240static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
241{
242 struct v9fs_session_info *v9ses;
243 struct p9_fid *fid;
244 struct p9_rstatfs rs;
245 int res;
246
247 fid = v9fs_fid_lookup(dentry);
248 if (IS_ERR(fid)) {
249 res = PTR_ERR(fid);
250 goto done;
251 }
252
253 v9ses = v9fs_dentry2v9ses(dentry);
254 if (v9fs_proto_dotl(v9ses)) {
255 res = p9_client_statfs(fid, &rs);
256 if (res == 0) {
257 buf->f_type = rs.type;
258 buf->f_bsize = rs.bsize;
259 buf->f_blocks = rs.blocks;
260 buf->f_bfree = rs.bfree;
261 buf->f_bavail = rs.bavail;
262 buf->f_files = rs.files;
263 buf->f_ffree = rs.ffree;
264 buf->f_fsid = u64_to_fsid(rs.fsid);
265 buf->f_namelen = rs.namelen;
266 }
267 if (res != -ENOSYS)
268 goto done;
269 }
270 res = simple_statfs(dentry, buf);
271done:
272 p9_fid_put(fid);
273 return res;
274}
275
276static int v9fs_drop_inode(struct inode *inode)
277{
278 struct v9fs_session_info *v9ses;
279
280 v9ses = v9fs_inode2v9ses(inode);
281 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
282 return generic_drop_inode(inode);
283 /*
284 * in case of non cached mode always drop the
285 * inode because we want the inode attribute
286 * to always match that on the server.
287 */
288 return 1;
289}
290
291static int v9fs_write_inode(struct inode *inode,
292 struct writeback_control *wbc)
293{
294 int ret;
295 struct p9_wstat wstat;
296 struct v9fs_inode *v9inode;
297 /*
298 * send an fsync request to server irrespective of
299 * wbc->sync_mode.
300 */
301 p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
302 v9inode = V9FS_I(inode);
303 if (!v9inode->writeback_fid)
304 return 0;
305 v9fs_blank_wstat(&wstat);
306
307 ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
308 if (ret < 0) {
309 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
310 return ret;
311 }
312 fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode));
313 return 0;
314}
315
316static int v9fs_write_inode_dotl(struct inode *inode,
317 struct writeback_control *wbc)
318{
319 int ret;
320 struct v9fs_inode *v9inode;
321 /*
322 * send an fsync request to server irrespective of
323 * wbc->sync_mode.
324 */
325 v9inode = V9FS_I(inode);
326 p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
327 __func__, inode, v9inode->writeback_fid);
328 if (!v9inode->writeback_fid)
329 return 0;
330
331 ret = p9_client_fsync(v9inode->writeback_fid, 0);
332 if (ret < 0) {
333 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
334 return ret;
335 }
336 fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode));
337 return 0;
338}
339
340static const struct super_operations v9fs_super_ops = {
341 .alloc_inode = v9fs_alloc_inode,
342 .free_inode = v9fs_free_inode,
343 .statfs = simple_statfs,
344 .evict_inode = v9fs_evict_inode,
345 .show_options = v9fs_show_options,
346 .umount_begin = v9fs_umount_begin,
347 .write_inode = v9fs_write_inode,
348};
349
350static const struct super_operations v9fs_super_ops_dotl = {
351 .alloc_inode = v9fs_alloc_inode,
352 .free_inode = v9fs_free_inode,
353 .statfs = v9fs_statfs,
354 .drop_inode = v9fs_drop_inode,
355 .evict_inode = v9fs_evict_inode,
356 .show_options = v9fs_show_options,
357 .umount_begin = v9fs_umount_begin,
358 .write_inode = v9fs_write_inode_dotl,
359};
360
361struct file_system_type v9fs_fs_type = {
362 .name = "9p",
363 .mount = v9fs_mount,
364 .kill_sb = v9fs_kill_super,
365 .owner = THIS_MODULE,
366 .fs_flags = FS_RENAME_DOES_D_MOVE,
367};
368MODULE_ALIAS_FS("9p");
1/*
2 * linux/fs/9p/vfs_super.c
3 *
4 * This file contians superblock ops for 9P2000. It is intended that
5 * you mount this file system on directories.
6 *
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/file.h>
32#include <linux/stat.h>
33#include <linux/string.h>
34#include <linux/inet.h>
35#include <linux/pagemap.h>
36#include <linux/seq_file.h>
37#include <linux/mount.h>
38#include <linux/idr.h>
39#include <linux/sched.h>
40#include <linux/slab.h>
41#include <linux/statfs.h>
42#include <linux/magic.h>
43#include <net/9p/9p.h>
44#include <net/9p/client.h>
45
46#include "v9fs.h"
47#include "v9fs_vfs.h"
48#include "fid.h"
49#include "xattr.h"
50#include "acl.h"
51
52static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
53
54/**
55 * v9fs_set_super - set the superblock
56 * @s: super block
57 * @data: file system specific data
58 *
59 */
60
61static int v9fs_set_super(struct super_block *s, void *data)
62{
63 s->s_fs_info = data;
64 return set_anon_super(s, data);
65}
66
67/**
68 * v9fs_fill_super - populate superblock with info
69 * @sb: superblock
70 * @v9ses: session information
71 * @flags: flags propagated from v9fs_mount()
72 *
73 */
74
75static void
76v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
77 int flags, void *data)
78{
79 sb->s_maxbytes = MAX_LFS_FILESIZE;
80 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
81 sb->s_blocksize = 1 << sb->s_blocksize_bits;
82 sb->s_magic = V9FS_MAGIC;
83 if (v9fs_proto_dotl(v9ses)) {
84 sb->s_op = &v9fs_super_ops_dotl;
85 sb->s_xattr = v9fs_xattr_handlers;
86 } else
87 sb->s_op = &v9fs_super_ops;
88 sb->s_bdi = &v9ses->bdi;
89 if (v9ses->cache)
90 sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_CACHE_SIZE;
91
92 sb->s_flags = flags | MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
93 if (!v9ses->cache)
94 sb->s_flags |= MS_SYNCHRONOUS;
95
96#ifdef CONFIG_9P_FS_POSIX_ACL
97 if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
98 sb->s_flags |= MS_POSIXACL;
99#endif
100
101 save_mount_options(sb, data);
102}
103
104/**
105 * v9fs_mount - mount a superblock
106 * @fs_type: file system type
107 * @flags: mount flags
108 * @dev_name: device name that was mounted
109 * @data: mount options
110 *
111 */
112
113static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
114 const char *dev_name, void *data)
115{
116 struct super_block *sb = NULL;
117 struct inode *inode = NULL;
118 struct dentry *root = NULL;
119 struct v9fs_session_info *v9ses = NULL;
120 int mode = S_IRWXUGO | S_ISVTX;
121 struct p9_fid *fid;
122 int retval = 0;
123
124 P9_DPRINTK(P9_DEBUG_VFS, " \n");
125
126 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
127 if (!v9ses)
128 return ERR_PTR(-ENOMEM);
129
130 fid = v9fs_session_init(v9ses, dev_name, data);
131 if (IS_ERR(fid)) {
132 retval = PTR_ERR(fid);
133 /*
134 * we need to call session_close to tear down some
135 * of the data structure setup by session_init
136 */
137 goto close_session;
138 }
139
140 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
141 if (IS_ERR(sb)) {
142 retval = PTR_ERR(sb);
143 goto clunk_fid;
144 }
145 v9fs_fill_super(sb, v9ses, flags, data);
146
147 if (v9ses->cache)
148 sb->s_d_op = &v9fs_cached_dentry_operations;
149 else
150 sb->s_d_op = &v9fs_dentry_operations;
151
152 inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
153 if (IS_ERR(inode)) {
154 retval = PTR_ERR(inode);
155 goto release_sb;
156 }
157
158 root = d_alloc_root(inode);
159 if (!root) {
160 iput(inode);
161 retval = -ENOMEM;
162 goto release_sb;
163 }
164 sb->s_root = root;
165 if (v9fs_proto_dotl(v9ses)) {
166 struct p9_stat_dotl *st = NULL;
167 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
168 if (IS_ERR(st)) {
169 retval = PTR_ERR(st);
170 goto release_sb;
171 }
172 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
173 v9fs_stat2inode_dotl(st, root->d_inode);
174 kfree(st);
175 } else {
176 struct p9_wstat *st = NULL;
177 st = p9_client_stat(fid);
178 if (IS_ERR(st)) {
179 retval = PTR_ERR(st);
180 goto release_sb;
181 }
182
183 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
184 v9fs_stat2inode(st, root->d_inode, sb);
185
186 p9stat_free(st);
187 kfree(st);
188 }
189 retval = v9fs_get_acl(inode, fid);
190 if (retval)
191 goto release_sb;
192 v9fs_fid_add(root, fid);
193
194 P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
195 return dget(sb->s_root);
196
197clunk_fid:
198 p9_client_clunk(fid);
199close_session:
200 v9fs_session_close(v9ses);
201 kfree(v9ses);
202 return ERR_PTR(retval);
203
204release_sb:
205 /*
206 * we will do the session_close and root dentry release
207 * in the below call. But we need to clunk fid, because we haven't
208 * attached the fid to dentry so it won't get clunked
209 * automatically.
210 */
211 p9_client_clunk(fid);
212 deactivate_locked_super(sb);
213 return ERR_PTR(retval);
214}
215
216/**
217 * v9fs_kill_super - Kill Superblock
218 * @s: superblock
219 *
220 */
221
222static void v9fs_kill_super(struct super_block *s)
223{
224 struct v9fs_session_info *v9ses = s->s_fs_info;
225
226 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
227
228 kill_anon_super(s);
229
230 v9fs_session_cancel(v9ses);
231 v9fs_session_close(v9ses);
232 kfree(v9ses);
233 s->s_fs_info = NULL;
234 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
235}
236
237static void
238v9fs_umount_begin(struct super_block *sb)
239{
240 struct v9fs_session_info *v9ses;
241
242 v9ses = sb->s_fs_info;
243 v9fs_session_begin_cancel(v9ses);
244}
245
246static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
247{
248 struct v9fs_session_info *v9ses;
249 struct p9_fid *fid;
250 struct p9_rstatfs rs;
251 int res;
252
253 fid = v9fs_fid_lookup(dentry);
254 if (IS_ERR(fid)) {
255 res = PTR_ERR(fid);
256 goto done;
257 }
258
259 v9ses = v9fs_dentry2v9ses(dentry);
260 if (v9fs_proto_dotl(v9ses)) {
261 res = p9_client_statfs(fid, &rs);
262 if (res == 0) {
263 buf->f_type = V9FS_MAGIC;
264 buf->f_bsize = rs.bsize;
265 buf->f_blocks = rs.blocks;
266 buf->f_bfree = rs.bfree;
267 buf->f_bavail = rs.bavail;
268 buf->f_files = rs.files;
269 buf->f_ffree = rs.ffree;
270 buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
271 buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
272 buf->f_namelen = rs.namelen;
273 }
274 if (res != -ENOSYS)
275 goto done;
276 }
277 res = simple_statfs(dentry, buf);
278done:
279 return res;
280}
281
282static int v9fs_drop_inode(struct inode *inode)
283{
284 struct v9fs_session_info *v9ses;
285 v9ses = v9fs_inode2v9ses(inode);
286 if (v9ses->cache)
287 return generic_drop_inode(inode);
288 /*
289 * in case of non cached mode always drop the
290 * the inode because we want the inode attribute
291 * to always match that on the server.
292 */
293 return 1;
294}
295
296static int v9fs_write_inode(struct inode *inode,
297 struct writeback_control *wbc)
298{
299 int ret;
300 struct p9_wstat wstat;
301 struct v9fs_inode *v9inode;
302 /*
303 * send an fsync request to server irrespective of
304 * wbc->sync_mode.
305 */
306 P9_DPRINTK(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
307 v9inode = V9FS_I(inode);
308 if (!v9inode->writeback_fid)
309 return 0;
310 v9fs_blank_wstat(&wstat);
311
312 ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
313 if (ret < 0) {
314 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
315 return ret;
316 }
317 return 0;
318}
319
320static int v9fs_write_inode_dotl(struct inode *inode,
321 struct writeback_control *wbc)
322{
323 int ret;
324 struct v9fs_inode *v9inode;
325 /*
326 * send an fsync request to server irrespective of
327 * wbc->sync_mode.
328 */
329 P9_DPRINTK(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
330 v9inode = V9FS_I(inode);
331 if (!v9inode->writeback_fid)
332 return 0;
333 ret = p9_client_fsync(v9inode->writeback_fid, 0);
334 if (ret < 0) {
335 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
336 return ret;
337 }
338 return 0;
339}
340
341static const struct super_operations v9fs_super_ops = {
342 .alloc_inode = v9fs_alloc_inode,
343 .destroy_inode = v9fs_destroy_inode,
344 .statfs = simple_statfs,
345 .evict_inode = v9fs_evict_inode,
346 .show_options = generic_show_options,
347 .umount_begin = v9fs_umount_begin,
348 .write_inode = v9fs_write_inode,
349};
350
351static const struct super_operations v9fs_super_ops_dotl = {
352 .alloc_inode = v9fs_alloc_inode,
353 .destroy_inode = v9fs_destroy_inode,
354 .statfs = v9fs_statfs,
355 .drop_inode = v9fs_drop_inode,
356 .evict_inode = v9fs_evict_inode,
357 .show_options = generic_show_options,
358 .umount_begin = v9fs_umount_begin,
359 .write_inode = v9fs_write_inode_dotl,
360};
361
362struct file_system_type v9fs_fs_type = {
363 .name = "9p",
364 .mount = v9fs_mount,
365 .kill_sb = v9fs_kill_super,
366 .owner = THIS_MODULE,
367 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT,
368};