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-rw-r--r--fs/9p/v9fs.c448
-rw-r--r--fs/9p/v9fs.h105
-rw-r--r--fs/9p/v9fs_vfs.h53
-rw-r--r--fs/9p/vfs_super.c271
4 files changed, 877 insertions, 0 deletions
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
new file mode 100644
index 000000000000..14d663ebfcbc
--- /dev/null
+++ b/fs/9p/v9fs.c
@@ -0,0 +1,448 @@
1/*
2 * linux/fs/9p/v9fs.c
3 *
4 * This file contains functions assisting in mapping VFS to 9P2000
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
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/config.h>
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/parser.h>
32#include <linux/idr.h>
33
34#include "debug.h"
35#include "v9fs.h"
36#include "9p.h"
37#include "v9fs_vfs.h"
38#include "transport.h"
39#include "mux.h"
40#include "conv.h"
41
42/* TODO: sysfs or debugfs interface */
43int v9fs_debug_level = 0; /* feature-rific global debug level */
44
45/*
46 * Option Parsing (code inspired by NFS code)
47 *
48 */
49
50enum {
51 /* Options that take integer arguments */
52 Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
53 Opt_rfdno, Opt_wfdno,
54 /* String options */
55 Opt_name, Opt_remotename,
56 /* Options that take no arguments */
57 Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
58 /* Error token */
59 Opt_err
60};
61
62static match_table_t tokens = {
63 {Opt_port, "port=%u"},
64 {Opt_msize, "msize=%u"},
65 {Opt_uid, "uid=%u"},
66 {Opt_gid, "gid=%u"},
67 {Opt_afid, "afid=%u"},
68 {Opt_rfdno, "rfdno=%u"},
69 {Opt_wfdno, "wfdno=%u"},
70 {Opt_debug, "debug=%u"},
71 {Opt_name, "name=%s"},
72 {Opt_remotename, "aname=%s"},
73 {Opt_unix, "proto=unix"},
74 {Opt_tcp, "proto=tcp"},
75 {Opt_fd, "proto=fd"},
76 {Opt_tcp, "tcp"},
77 {Opt_unix, "unix"},
78 {Opt_fd, "fd"},
79 {Opt_legacy, "noextend"},
80 {Opt_nodevmap, "nodevmap"},
81 {Opt_err, NULL}
82};
83
84/*
85 * Parse option string.
86 */
87
88/**
89 * v9fs_parse_options - parse mount options into session structure
90 * @options: options string passed from mount
91 * @v9ses: existing v9fs session information
92 *
93 */
94
95static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
96{
97 char *p;
98 substring_t args[MAX_OPT_ARGS];
99 int option;
100 int ret;
101
102 /* setup defaults */
103 v9ses->port = V9FS_PORT;
104 v9ses->maxdata = 9000;
105 v9ses->proto = PROTO_TCP;
106 v9ses->extended = 1;
107 v9ses->afid = ~0;
108 v9ses->debug = 0;
109 v9ses->rfdno = ~0;
110 v9ses->wfdno = ~0;
111
112 if (!options)
113 return;
114
115 while ((p = strsep(&options, ",")) != NULL) {
116 int token;
117 if (!*p)
118 continue;
119 token = match_token(p, tokens, args);
120 if (token < Opt_name) {
121 if ((ret = match_int(&args[0], &option)) < 0) {
122 dprintk(DEBUG_ERROR,
123 "integer field, but no integer?\n");
124 continue;
125 }
126
127 }
128 switch (token) {
129 case Opt_port:
130 v9ses->port = option;
131 break;
132 case Opt_msize:
133 v9ses->maxdata = option;
134 break;
135 case Opt_uid:
136 v9ses->uid = option;
137 break;
138 case Opt_gid:
139 v9ses->gid = option;
140 break;
141 case Opt_afid:
142 v9ses->afid = option;
143 break;
144 case Opt_rfdno:
145 v9ses->rfdno = option;
146 break;
147 case Opt_wfdno:
148 v9ses->wfdno = option;
149 break;
150 case Opt_debug:
151 v9ses->debug = option;
152 break;
153 case Opt_tcp:
154 v9ses->proto = PROTO_TCP;
155 break;
156 case Opt_unix:
157 v9ses->proto = PROTO_UNIX;
158 break;
159 case Opt_fd:
160 v9ses->proto = PROTO_FD;
161 break;
162 case Opt_name:
163 match_strcpy(v9ses->name, &args[0]);
164 break;
165 case Opt_remotename:
166 match_strcpy(v9ses->remotename, &args[0]);
167 break;
168 case Opt_legacy:
169 v9ses->extended = 0;
170 break;
171 case Opt_nodevmap:
172 v9ses->nodev = 1;
173 break;
174 default:
175 continue;
176 }
177 }
178}
179
180/**
181 * v9fs_inode2v9ses - safely extract v9fs session info from super block
182 * @inode: inode to extract information from
183 *
184 * Paranoid function to extract v9ses information from superblock,
185 * if anything is missing it will report an error.
186 *
187 */
188
189struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
190{
191 return (inode->i_sb->s_fs_info);
192}
193
194/**
195 * v9fs_get_idpool - allocate numeric id from pool
196 * @p - pool to allocate from
197 *
198 * XXX - This seems to be an awful generic function, should it be in idr.c with
199 * the lock included in struct idr?
200 */
201
202int v9fs_get_idpool(struct v9fs_idpool *p)
203{
204 int i = 0;
205 int error;
206
207retry:
208 if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
209 return 0;
210
211 if (down_interruptible(&p->lock) == -EINTR) {
212 eprintk(KERN_WARNING, "Interrupted while locking\n");
213 return -1;
214 }
215
216 error = idr_get_new(&p->pool, NULL, &i);
217 up(&p->lock);
218
219 if (error == -EAGAIN)
220 goto retry;
221 else if (error)
222 return -1;
223
224 return i;
225}
226
227/**
228 * v9fs_put_idpool - release numeric id from pool
229 * @p - pool to allocate from
230 *
231 * XXX - This seems to be an awful generic function, should it be in idr.c with
232 * the lock included in struct idr?
233 */
234
235void v9fs_put_idpool(int id, struct v9fs_idpool *p)
236{
237 if (down_interruptible(&p->lock) == -EINTR) {
238 eprintk(KERN_WARNING, "Interrupted while locking\n");
239 return;
240 }
241 idr_remove(&p->pool, id);
242 up(&p->lock);
243}
244
245/**
246 * v9fs_session_init - initialize session
247 * @v9ses: session information structure
248 * @dev_name: device being mounted
249 * @data: options
250 *
251 */
252
253int
254v9fs_session_init(struct v9fs_session_info *v9ses,
255 const char *dev_name, char *data)
256{
257 struct v9fs_fcall *fcall = NULL;
258 struct v9fs_transport *trans_proto;
259 int n = 0;
260 int newfid = -1;
261 int retval = -EINVAL;
262
263 v9ses->name = __getname();
264 if (!v9ses->name)
265 return -ENOMEM;
266
267 v9ses->remotename = __getname();
268 if (!v9ses->remotename) {
269 putname(v9ses->name);
270 return -ENOMEM;
271 }
272
273 strcpy(v9ses->name, V9FS_DEFUSER);
274 strcpy(v9ses->remotename, V9FS_DEFANAME);
275
276 v9fs_parse_options(data, v9ses);
277
278 /* set global debug level */
279 v9fs_debug_level = v9ses->debug;
280
281 /* id pools that are session-dependent: FIDs and TIDs */
282 idr_init(&v9ses->fidpool.pool);
283 init_MUTEX(&v9ses->fidpool.lock);
284 idr_init(&v9ses->tidpool.pool);
285 init_MUTEX(&v9ses->tidpool.lock);
286
287
288 switch (v9ses->proto) {
289 case PROTO_TCP:
290 trans_proto = &v9fs_trans_tcp;
291 break;
292 case PROTO_UNIX:
293 trans_proto = &v9fs_trans_unix;
294 *v9ses->remotename = 0;
295 break;
296 case PROTO_FD:
297 trans_proto = &v9fs_trans_fd;
298 *v9ses->remotename = 0;
299 if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
300 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
301 retval = -ENOPROTOOPT;
302 goto SessCleanUp;
303 }
304 break;
305 default:
306 printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
307 retval = -ENOPROTOOPT;
308 goto SessCleanUp;
309 };
310
311 v9ses->transport = trans_proto;
312
313 if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) {
314 eprintk(KERN_ERR, "problem initializing transport\n");
315 goto SessCleanUp;
316 }
317
318 v9ses->inprogress = 0;
319 v9ses->shutdown = 0;
320 v9ses->session_hung = 0;
321
322 if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) {
323 dprintk(DEBUG_ERROR, "problem initializing mux\n");
324 goto SessCleanUp;
325 }
326
327 if (v9ses->afid == ~0) {
328 if (v9ses->extended)
329 retval =
330 v9fs_t_version(v9ses, v9ses->maxdata, "9P2000.u",
331 &fcall);
332 else
333 retval = v9fs_t_version(v9ses, v9ses->maxdata, "9P2000",
334 &fcall);
335
336 if (retval < 0) {
337 dprintk(DEBUG_ERROR, "v9fs_t_version failed\n");
338 goto FreeFcall;
339 }
340
341 /* Really should check for 9P1 and report error */
342 if (!strcmp(fcall->params.rversion.version, "9P2000.u")) {
343 dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
344 v9ses->extended = 1;
345 } else {
346 dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
347 v9ses->extended = 0;
348 }
349
350 n = fcall->params.rversion.msize;
351 kfree(fcall);
352
353 if (n < v9ses->maxdata)
354 v9ses->maxdata = n;
355 }
356
357 newfid = v9fs_get_idpool(&v9ses->fidpool);
358 if (newfid < 0) {
359 eprintk(KERN_WARNING, "couldn't allocate FID\n");
360 retval = -ENOMEM;
361 goto SessCleanUp;
362 }
363 /* it is a little bit ugly, but we have to prevent newfid */
364 /* being the same as afid, so if it is, get a new fid */
365 if (v9ses->afid != ~0 && newfid == v9ses->afid) {
366 newfid = v9fs_get_idpool(&v9ses->fidpool);
367 if (newfid < 0) {
368 eprintk(KERN_WARNING, "couldn't allocate FID\n");
369 retval = -ENOMEM;
370 goto SessCleanUp;
371 }
372 }
373
374 if ((retval =
375 v9fs_t_attach(v9ses, v9ses->name, v9ses->remotename, newfid,
376 v9ses->afid, NULL))
377 < 0) {
378 dprintk(DEBUG_ERROR, "cannot attach\n");
379 goto SessCleanUp;
380 }
381
382 if (v9ses->afid != ~0) {
383 if (v9fs_t_clunk(v9ses, v9ses->afid, NULL))
384 dprintk(DEBUG_ERROR, "clunk failed\n");
385 }
386
387 return newfid;
388
389 FreeFcall:
390 kfree(fcall);
391
392 SessCleanUp:
393 v9fs_session_close(v9ses);
394 return retval;
395}
396
397/**
398 * v9fs_session_close - shutdown a session
399 * @v9ses: session information structure
400 *
401 */
402
403void v9fs_session_close(struct v9fs_session_info *v9ses)
404{
405 if (v9ses->recvproc) {
406 send_sig(SIGKILL, v9ses->recvproc, 1);
407 wait_for_completion(&v9ses->proccmpl);
408 }
409
410 if (v9ses->transport)
411 v9ses->transport->close(v9ses->transport);
412
413 putname(v9ses->name);
414 putname(v9ses->remotename);
415}
416
417extern int v9fs_error_init(void);
418
419/**
420 * v9fs_init - Initialize module
421 *
422 */
423
424static int __init init_v9fs(void)
425{
426 v9fs_error_init();
427
428 printk(KERN_INFO "Installing v9fs 9P2000 file system support\n");
429
430 return register_filesystem(&v9fs_fs_type);
431}
432
433/**
434 * v9fs_init - shutdown module
435 *
436 */
437
438static void __exit exit_v9fs(void)
439{
440 unregister_filesystem(&v9fs_fs_type);
441}
442
443module_init(init_v9fs)
444module_exit(exit_v9fs)
445
446MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
447MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
448MODULE_LICENSE("GPL");
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
new file mode 100644
index 000000000000..52203027b158
--- /dev/null
+++ b/fs/9p/v9fs.h
@@ -0,0 +1,105 @@
1/*
2 * V9FS definitions.
3 *
4 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
5 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to:
19 * Free Software Foundation
20 * 51 Franklin Street, Fifth Floor
21 * Boston, MA 02111-1301 USA
22 *
23 */
24
25/*
26 * Idpool structure provides lock and id management
27 *
28 */
29
30struct v9fs_idpool {
31 struct semaphore lock;
32 struct idr pool;
33};
34
35/*
36 * Session structure provides information for an opened session
37 *
38 */
39
40struct v9fs_session_info {
41 /* options */
42 unsigned int maxdata;
43 unsigned char extended; /* set to 1 if we are using UNIX extensions */
44 unsigned char nodev; /* set to 1 if no disable device mapping */
45 unsigned short port; /* port to connect to */
46 unsigned short debug; /* debug level */
47 unsigned short proto; /* protocol to use */
48 unsigned int afid; /* authentication fid */
49 unsigned int rfdno; /* read file descriptor number */
50 unsigned int wfdno; /* write file descriptor number */
51
52
53 char *name; /* user name to mount as */
54 char *remotename; /* name of remote hierarchy being mounted */
55 unsigned int uid; /* default uid/muid for legacy support */
56 unsigned int gid; /* default gid for legacy support */
57
58 /* book keeping */
59 struct v9fs_idpool fidpool; /* The FID pool for file descriptors */
60 struct v9fs_idpool tidpool; /* The TID pool for transactions ids */
61
62 /* transport information */
63 struct v9fs_transport *transport;
64
65 int inprogress; /* session in progress => true */
66 int shutdown; /* session shutting down. no more attaches. */
67 unsigned char session_hung;
68
69 /* mux private data */
70 struct v9fs_fcall *curfcall;
71 wait_queue_head_t read_wait;
72 struct completion fcread;
73 struct completion proccmpl;
74 struct task_struct *recvproc;
75
76 spinlock_t muxlock;
77 struct list_head mux_fcalls;
78};
79
80/* possible values of ->proto */
81enum {
82 PROTO_TCP,
83 PROTO_UNIX,
84 PROTO_FD,
85};
86
87int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
88struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
89void v9fs_session_close(struct v9fs_session_info *v9ses);
90int v9fs_get_idpool(struct v9fs_idpool *p);
91void v9fs_put_idpool(int id, struct v9fs_idpool *p);
92int v9fs_get_option(char *opts, char *name, char *buf, int buflen);
93long long v9fs_get_int_option(char *opts, char *name, long long dflt);
94int v9fs_parse_tcp_devname(const char *devname, char **addr, char **remotename);
95
96#define V9FS_MAGIC 0x01021997
97
98/* other default globals */
99#define V9FS_PORT 564
100#define V9FS_DEFUSER "nobody"
101#define V9FS_DEFANAME ""
102
103/* inital pool sizes for fids and tags */
104#define V9FS_START_FIDS 8192
105#define V9FS_START_TIDS 256
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
new file mode 100644
index 000000000000..2f2cea7ee3e7
--- /dev/null
+++ b/fs/9p/v9fs_vfs.h
@@ -0,0 +1,53 @@
1/*
2 * V9FS VFS extensions.
3 *
4 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
5 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to:
19 * Free Software Foundation
20 * 51 Franklin Street, Fifth Floor
21 * Boston, MA 02111-1301 USA
22 *
23 */
24
25/* plan9 semantics are that created files are implicitly opened.
26 * But linux semantics are that you call create, then open.
27 * the plan9 approach is superior as it provides an atomic
28 * open.
29 * we track the create fid here. When the file is opened, if fidopen is
30 * non-zero, we use the fid and can skip some steps.
31 * there may be a better way to do this, but I don't know it.
32 * one BAD way is to clunk the fid on create, then open it again:
33 * you lose the atomicity of file open
34 */
35
36/* special case:
37 * unlink calls remove, which is an implicit clunk. So we have to track
38 * that kind of thing so that we don't try to clunk a dead fid.
39 */
40
41extern struct file_system_type v9fs_fs_type;
42extern struct file_operations v9fs_file_operations;
43extern struct file_operations v9fs_dir_operations;
44extern struct dentry_operations v9fs_dentry_operations;
45
46struct inode *v9fs_get_inode(struct super_block *sb, int mode);
47ino_t v9fs_qid2ino(struct v9fs_qid *qid);
48void v9fs_mistat2inode(struct v9fs_stat *, struct inode *,
49 struct super_block *);
50int v9fs_dir_release(struct inode *inode, struct file *filp);
51int v9fs_file_open(struct inode *inode, struct file *file);
52void v9fs_inode2mistat(struct inode *inode, struct v9fs_stat *mistat);
53void v9fs_dentry_release(struct dentry *);
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
new file mode 100644
index 000000000000..ce0778acc90a
--- /dev/null
+++ b/fs/9p/vfs_super.c
@@ -0,0 +1,271 @@
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 as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to:
22 * Free Software Foundation
23 * 51 Franklin Street, Fifth Floor
24 * Boston, MA 02111-1301 USA
25 *
26 */
27
28#include <linux/kernel.h>
29#include <linux/config.h>
30#include <linux/module.h>
31#include <linux/errno.h>
32#include <linux/fs.h>
33#include <linux/file.h>
34#include <linux/stat.h>
35#include <linux/string.h>
36#include <linux/smp_lock.h>
37#include <linux/inet.h>
38#include <linux/pagemap.h>
39#include <linux/seq_file.h>
40#include <linux/mount.h>
41#include <linux/idr.h>
42
43#include "debug.h"
44#include "v9fs.h"
45#include "9p.h"
46#include "v9fs_vfs.h"
47#include "conv.h"
48#include "fid.h"
49
50static void v9fs_clear_inode(struct inode *);
51static struct super_operations v9fs_super_ops;
52
53/**
54 * v9fs_clear_inode - release an inode
55 * @inode: inode to release
56 *
57 */
58
59static void v9fs_clear_inode(struct inode *inode)
60{
61 filemap_fdatawrite(inode->i_mapping);
62}
63
64/**
65 * v9fs_set_super - set the superblock
66 * @s: super block
67 * @data: file system specific data
68 *
69 */
70
71static int v9fs_set_super(struct super_block *s, void *data)
72{
73 s->s_fs_info = data;
74 return set_anon_super(s, data);
75}
76
77/**
78 * v9fs_fill_super - populate superblock with info
79 * @sb: superblock
80 * @v9ses: session information
81 *
82 */
83
84static void
85v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
86 int flags)
87{
88 sb->s_maxbytes = MAX_LFS_FILESIZE;
89 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
90 sb->s_blocksize = 1 << sb->s_blocksize_bits;
91 sb->s_magic = V9FS_MAGIC;
92 sb->s_op = &v9fs_super_ops;
93
94 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
95 MS_NODIRATIME | MS_NOATIME;
96}
97
98/**
99 * v9fs_get_sb - mount a superblock
100 * @fs_type: file system type
101 * @flags: mount flags
102 * @dev_name: device name that was mounted
103 * @data: mount options
104 *
105 */
106
107static struct super_block *v9fs_get_sb(struct file_system_type
108 *fs_type, int flags,
109 const char *dev_name, void *data)
110{
111 struct super_block *sb = NULL;
112 struct v9fs_fcall *fcall = NULL;
113 struct inode *inode = NULL;
114 struct dentry *root = NULL;
115 struct v9fs_session_info *v9ses = NULL;
116 struct v9fs_fid *root_fid = NULL;
117 int mode = S_IRWXUGO | S_ISVTX;
118 uid_t uid = current->fsuid;
119 gid_t gid = current->fsgid;
120 int stat_result = 0;
121 int newfid = 0;
122 int retval = 0;
123
124 dprintk(DEBUG_VFS, " \n");
125
126 v9ses = kcalloc(1, sizeof(struct v9fs_session_info), GFP_KERNEL);
127 if (!v9ses)
128 return ERR_PTR(-ENOMEM);
129
130 if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
131 dprintk(DEBUG_ERROR, "problem initiating session\n");
132 retval = newfid;
133 goto free_session;
134 }
135
136 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
137
138 v9fs_fill_super(sb, v9ses, flags);
139
140 inode = v9fs_get_inode(sb, S_IFDIR | mode);
141 if (IS_ERR(inode)) {
142 retval = PTR_ERR(inode);
143 goto put_back_sb;
144 }
145
146 inode->i_uid = uid;
147 inode->i_gid = gid;
148
149 root = d_alloc_root(inode);
150
151 if (!root) {
152 retval = -ENOMEM;
153 goto release_inode;
154 }
155
156 sb->s_root = root;
157
158 /* Setup the Root Inode */
159 root_fid = v9fs_fid_create(root);
160 if (root_fid == NULL) {
161 retval = -ENOMEM;
162 goto release_dentry;
163 }
164
165 root_fid->fidopen = 0;
166 root_fid->v9ses = v9ses;
167
168 stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
169 if (stat_result < 0) {
170 dprintk(DEBUG_ERROR, "stat error\n");
171 v9fs_t_clunk(v9ses, newfid, NULL);
172 v9fs_put_idpool(newfid, &v9ses->fidpool);
173 } else {
174 root_fid->fid = newfid;
175 root_fid->qid = fcall->params.rstat.stat->qid;
176 root->d_inode->i_ino =
177 v9fs_qid2ino(&fcall->params.rstat.stat->qid);
178 v9fs_mistat2inode(fcall->params.rstat.stat, root->d_inode, sb);
179 }
180
181 kfree(fcall);
182
183 if (stat_result < 0) {
184 retval = stat_result;
185 goto release_dentry;
186 }
187
188 return sb;
189
190 release_dentry:
191 dput(sb->s_root);
192
193 release_inode:
194 iput(inode);
195
196 put_back_sb:
197 up_write(&sb->s_umount);
198 deactivate_super(sb);
199 v9fs_session_close(v9ses);
200
201 free_session:
202 kfree(v9ses);
203
204 return ERR_PTR(retval);
205}
206
207/**
208 * v9fs_kill_super - Kill Superblock
209 * @s: superblock
210 *
211 */
212
213static void v9fs_kill_super(struct super_block *s)
214{
215 struct v9fs_session_info *v9ses = s->s_fs_info;
216
217 dprintk(DEBUG_VFS, " %p\n", s);
218
219 v9fs_dentry_release(s->s_root); /* clunk root */
220
221 kill_anon_super(s);
222
223 v9fs_session_close(v9ses);
224 kfree(v9ses);
225 dprintk(DEBUG_VFS, "exiting kill_super\n");
226}
227
228/**
229 * v9fs_show_options - Show mount options in /proc/mounts
230 * @m: seq_file to write to
231 * @mnt: mount descriptor
232 *
233 */
234
235static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
236{
237 struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
238
239 if (v9ses->debug != 0)
240 seq_printf(m, ",debug=%u", v9ses->debug);
241 if (v9ses->port != V9FS_PORT)
242 seq_printf(m, ",port=%u", v9ses->port);
243 if (v9ses->maxdata != 9000)
244 seq_printf(m, ",msize=%u", v9ses->maxdata);
245 if (v9ses->afid != ~0)
246 seq_printf(m, ",afid=%u", v9ses->afid);
247 if (v9ses->proto == PROTO_UNIX)
248 seq_puts(m, ",proto=unix");
249 if (v9ses->extended == 0)
250 seq_puts(m, ",noextend");
251 if (v9ses->nodev == 1)
252 seq_puts(m, ",nodevmap");
253 seq_printf(m, ",name=%s", v9ses->name);
254 seq_printf(m, ",aname=%s", v9ses->remotename);
255 seq_printf(m, ",uid=%u", v9ses->uid);
256 seq_printf(m, ",gid=%u", v9ses->gid);
257 return 0;
258}
259
260static struct super_operations v9fs_super_ops = {
261 .statfs = simple_statfs,
262 .clear_inode = v9fs_clear_inode,
263 .show_options = v9fs_show_options,
264};
265
266struct file_system_type v9fs_fs_type = {
267 .name = "9P",
268 .get_sb = v9fs_get_sb,
269 .kill_sb = v9fs_kill_super,
270 .owner = THIS_MODULE,
271};
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-01 22:25:26 -0400