[PATCH] fuse: no backgrounding on interrupt
[linux-2.6-block.git] / fs / fuse / inode.c
CommitLineData
d8a5ba45
MS
1/*
2 FUSE: Filesystem in Userspace
d7133114 3 Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
d8a5ba45
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4
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7*/
8
9#include "fuse_i.h"
10
11#include <linux/pagemap.h>
12#include <linux/slab.h>
13#include <linux/file.h>
d8a5ba45
MS
14#include <linux/seq_file.h>
15#include <linux/init.h>
16#include <linux/module.h>
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17#include <linux/parser.h>
18#include <linux/statfs.h>
19
20MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
21MODULE_DESCRIPTION("Filesystem in Userspace");
22MODULE_LICENSE("GPL");
23
d8a5ba45 24static kmem_cache_t *fuse_inode_cachep;
f543f253
MS
25static struct subsystem connections_subsys;
26
27struct fuse_conn_attr {
28 struct attribute attr;
29 ssize_t (*show)(struct fuse_conn *, char *);
30 ssize_t (*store)(struct fuse_conn *, const char *, size_t);
31};
d8a5ba45
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32
33#define FUSE_SUPER_MAGIC 0x65735546
34
35struct fuse_mount_data {
36 int fd;
37 unsigned rootmode;
38 unsigned user_id;
87729a55 39 unsigned group_id;
5a533682
MS
40 unsigned fd_present : 1;
41 unsigned rootmode_present : 1;
42 unsigned user_id_present : 1;
43 unsigned group_id_present : 1;
1e9a4ed9 44 unsigned flags;
db50b96c 45 unsigned max_read;
d8a5ba45
MS
46};
47
48static struct inode *fuse_alloc_inode(struct super_block *sb)
49{
50 struct inode *inode;
51 struct fuse_inode *fi;
52
53 inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
54 if (!inode)
55 return NULL;
56
57 fi = get_fuse_inode(inode);
58 fi->i_time = jiffies - 1;
59 fi->nodeid = 0;
9e6268db 60 fi->nlookup = 0;
e5e5558e
MS
61 fi->forget_req = fuse_request_alloc();
62 if (!fi->forget_req) {
63 kmem_cache_free(fuse_inode_cachep, inode);
64 return NULL;
65 }
d8a5ba45
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66
67 return inode;
68}
69
70static void fuse_destroy_inode(struct inode *inode)
71{
e5e5558e
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72 struct fuse_inode *fi = get_fuse_inode(inode);
73 if (fi->forget_req)
74 fuse_request_free(fi->forget_req);
d8a5ba45
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75 kmem_cache_free(fuse_inode_cachep, inode);
76}
77
78static void fuse_read_inode(struct inode *inode)
79{
80 /* No op */
81}
82
e5e5558e 83void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
9e6268db 84 unsigned long nodeid, u64 nlookup)
e5e5558e
MS
85{
86 struct fuse_forget_in *inarg = &req->misc.forget_in;
9e6268db 87 inarg->nlookup = nlookup;
e5e5558e
MS
88 req->in.h.opcode = FUSE_FORGET;
89 req->in.h.nodeid = nodeid;
90 req->in.numargs = 1;
91 req->in.args[0].size = sizeof(struct fuse_forget_in);
92 req->in.args[0].value = inarg;
93 request_send_noreply(fc, req);
94}
95
d8a5ba45
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96static void fuse_clear_inode(struct inode *inode)
97{
1e9a4ed9
MS
98 if (inode->i_sb->s_flags & MS_ACTIVE) {
99 struct fuse_conn *fc = get_fuse_conn(inode);
e5e5558e 100 struct fuse_inode *fi = get_fuse_inode(inode);
9e6268db 101 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
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102 fi->forget_req = NULL;
103 }
d8a5ba45
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104}
105
106void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
107{
108 if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
109 invalidate_inode_pages(inode->i_mapping);
110
111 inode->i_ino = attr->ino;
112 inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
113 inode->i_nlink = attr->nlink;
114 inode->i_uid = attr->uid;
115 inode->i_gid = attr->gid;
116 i_size_write(inode, attr->size);
117 inode->i_blksize = PAGE_CACHE_SIZE;
118 inode->i_blocks = attr->blocks;
119 inode->i_atime.tv_sec = attr->atime;
120 inode->i_atime.tv_nsec = attr->atimensec;
121 inode->i_mtime.tv_sec = attr->mtime;
122 inode->i_mtime.tv_nsec = attr->mtimensec;
123 inode->i_ctime.tv_sec = attr->ctime;
124 inode->i_ctime.tv_nsec = attr->ctimensec;
125}
126
127static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
128{
129 inode->i_mode = attr->mode & S_IFMT;
130 i_size_write(inode, attr->size);
e5e5558e
MS
131 if (S_ISREG(inode->i_mode)) {
132 fuse_init_common(inode);
b6aeaded 133 fuse_init_file_inode(inode);
e5e5558e
MS
134 } else if (S_ISDIR(inode->i_mode))
135 fuse_init_dir(inode);
136 else if (S_ISLNK(inode->i_mode))
137 fuse_init_symlink(inode);
138 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
139 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
140 fuse_init_common(inode);
141 init_special_inode(inode, inode->i_mode,
142 new_decode_dev(attr->rdev));
39ee059a
MS
143 } else
144 BUG();
d8a5ba45
MS
145}
146
147static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
148{
149 unsigned long nodeid = *(unsigned long *) _nodeidp;
150 if (get_node_id(inode) == nodeid)
151 return 1;
152 else
153 return 0;
154}
155
156static int fuse_inode_set(struct inode *inode, void *_nodeidp)
157{
158 unsigned long nodeid = *(unsigned long *) _nodeidp;
159 get_fuse_inode(inode)->nodeid = nodeid;
160 return 0;
161}
162
163struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
9e6268db 164 int generation, struct fuse_attr *attr)
d8a5ba45
MS
165{
166 struct inode *inode;
9e6268db 167 struct fuse_inode *fi;
d8a5ba45
MS
168 struct fuse_conn *fc = get_fuse_conn_super(sb);
169 int retried = 0;
170
171 retry:
172 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
173 if (!inode)
174 return NULL;
175
176 if ((inode->i_state & I_NEW)) {
b36c31ba 177 inode->i_flags |= S_NOATIME|S_NOCMTIME;
d8a5ba45
MS
178 inode->i_generation = generation;
179 inode->i_data.backing_dev_info = &fc->bdi;
180 fuse_init_inode(inode, attr);
181 unlock_new_inode(inode);
182 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
183 BUG_ON(retried);
184 /* Inode has changed type, any I/O on the old should fail */
185 make_bad_inode(inode);
186 iput(inode);
187 retried = 1;
188 goto retry;
189 }
190
9e6268db
MS
191 fi = get_fuse_inode(inode);
192 fi->nlookup ++;
d8a5ba45 193 fuse_change_attributes(inode, attr);
d8a5ba45
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194 return inode;
195}
196
69a53bf2
MS
197static void fuse_umount_begin(struct super_block *sb)
198{
199 fuse_abort_conn(get_fuse_conn_super(sb));
200}
201
d8a5ba45
MS
202static void fuse_put_super(struct super_block *sb)
203{
204 struct fuse_conn *fc = get_fuse_conn_super(sb);
205
d7133114 206 spin_lock(&fc->lock);
9ba7cbba 207 fc->connected = 0;
51eb01e7 208 fc->blocked = 0;
d7133114 209 spin_unlock(&fc->lock);
334f485d 210 /* Flush all readers on this fs */
385a17bf 211 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
334f485d 212 wake_up_all(&fc->waitq);
51eb01e7 213 wake_up_all(&fc->blocked_waitq);
f543f253
MS
214 kobject_del(&fc->kobj);
215 kobject_put(&fc->kobj);
d8a5ba45
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216}
217
e5e5558e
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218static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
219{
220 stbuf->f_type = FUSE_SUPER_MAGIC;
221 stbuf->f_bsize = attr->bsize;
de5f1202 222 stbuf->f_frsize = attr->frsize;
e5e5558e
MS
223 stbuf->f_blocks = attr->blocks;
224 stbuf->f_bfree = attr->bfree;
225 stbuf->f_bavail = attr->bavail;
226 stbuf->f_files = attr->files;
227 stbuf->f_ffree = attr->ffree;
228 stbuf->f_namelen = attr->namelen;
229 /* fsid is left zero */
230}
231
726c3342 232static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
e5e5558e 233{
726c3342 234 struct super_block *sb = dentry->d_sb;
e5e5558e
MS
235 struct fuse_conn *fc = get_fuse_conn_super(sb);
236 struct fuse_req *req;
237 struct fuse_statfs_out outarg;
238 int err;
239
ce1d5a49
MS
240 req = fuse_get_req(fc);
241 if (IS_ERR(req))
242 return PTR_ERR(req);
e5e5558e 243
de5f1202 244 memset(&outarg, 0, sizeof(outarg));
e5e5558e
MS
245 req->in.numargs = 0;
246 req->in.h.opcode = FUSE_STATFS;
247 req->out.numargs = 1;
de5f1202
MS
248 req->out.args[0].size =
249 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
e5e5558e
MS
250 req->out.args[0].value = &outarg;
251 request_send(fc, req);
252 err = req->out.h.error;
253 if (!err)
254 convert_fuse_statfs(buf, &outarg.st);
255 fuse_put_request(fc, req);
256 return err;
257}
258
d8a5ba45
MS
259enum {
260 OPT_FD,
261 OPT_ROOTMODE,
262 OPT_USER_ID,
87729a55 263 OPT_GROUP_ID,
d8a5ba45
MS
264 OPT_DEFAULT_PERMISSIONS,
265 OPT_ALLOW_OTHER,
db50b96c 266 OPT_MAX_READ,
d8a5ba45
MS
267 OPT_ERR
268};
269
270static match_table_t tokens = {
271 {OPT_FD, "fd=%u"},
272 {OPT_ROOTMODE, "rootmode=%o"},
273 {OPT_USER_ID, "user_id=%u"},
87729a55 274 {OPT_GROUP_ID, "group_id=%u"},
d8a5ba45
MS
275 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
276 {OPT_ALLOW_OTHER, "allow_other"},
db50b96c 277 {OPT_MAX_READ, "max_read=%u"},
d8a5ba45
MS
278 {OPT_ERR, NULL}
279};
280
281static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
282{
283 char *p;
284 memset(d, 0, sizeof(struct fuse_mount_data));
db50b96c 285 d->max_read = ~0;
d8a5ba45
MS
286
287 while ((p = strsep(&opt, ",")) != NULL) {
288 int token;
289 int value;
290 substring_t args[MAX_OPT_ARGS];
291 if (!*p)
292 continue;
293
294 token = match_token(p, tokens, args);
295 switch (token) {
296 case OPT_FD:
297 if (match_int(&args[0], &value))
298 return 0;
299 d->fd = value;
5a533682 300 d->fd_present = 1;
d8a5ba45
MS
301 break;
302
303 case OPT_ROOTMODE:
304 if (match_octal(&args[0], &value))
305 return 0;
306 d->rootmode = value;
5a533682 307 d->rootmode_present = 1;
d8a5ba45
MS
308 break;
309
310 case OPT_USER_ID:
311 if (match_int(&args[0], &value))
312 return 0;
313 d->user_id = value;
5a533682 314 d->user_id_present = 1;
d8a5ba45
MS
315 break;
316
87729a55
MS
317 case OPT_GROUP_ID:
318 if (match_int(&args[0], &value))
319 return 0;
320 d->group_id = value;
5a533682 321 d->group_id_present = 1;
87729a55
MS
322 break;
323
1e9a4ed9
MS
324 case OPT_DEFAULT_PERMISSIONS:
325 d->flags |= FUSE_DEFAULT_PERMISSIONS;
326 break;
327
328 case OPT_ALLOW_OTHER:
329 d->flags |= FUSE_ALLOW_OTHER;
330 break;
331
db50b96c
MS
332 case OPT_MAX_READ:
333 if (match_int(&args[0], &value))
334 return 0;
335 d->max_read = value;
336 break;
337
d8a5ba45
MS
338 default:
339 return 0;
340 }
341 }
5a533682
MS
342
343 if (!d->fd_present || !d->rootmode_present ||
344 !d->user_id_present || !d->group_id_present)
d8a5ba45
MS
345 return 0;
346
347 return 1;
348}
349
350static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
351{
352 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
353
354 seq_printf(m, ",user_id=%u", fc->user_id);
87729a55 355 seq_printf(m, ",group_id=%u", fc->group_id);
1e9a4ed9
MS
356 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
357 seq_puts(m, ",default_permissions");
358 if (fc->flags & FUSE_ALLOW_OTHER)
359 seq_puts(m, ",allow_other");
db50b96c
MS
360 if (fc->max_read != ~0)
361 seq_printf(m, ",max_read=%u", fc->max_read);
d8a5ba45
MS
362 return 0;
363}
364
f543f253 365static void fuse_conn_release(struct kobject *kobj)
d8a5ba45 366{
ce1d5a49 367 kfree(get_fuse_conn_kobj(kobj));
d8a5ba45
MS
368}
369
370static struct fuse_conn *new_conn(void)
371{
372 struct fuse_conn *fc;
373
6383bdaa 374 fc = kzalloc(sizeof(*fc), GFP_KERNEL);
f543f253 375 if (fc) {
d7133114 376 spin_lock_init(&fc->lock);
334f485d 377 init_waitqueue_head(&fc->waitq);
08a53cdc 378 init_waitqueue_head(&fc->blocked_waitq);
334f485d
MS
379 INIT_LIST_HEAD(&fc->pending);
380 INIT_LIST_HEAD(&fc->processing);
d77a1d5b 381 INIT_LIST_HEAD(&fc->io);
f543f253
MS
382 kobj_set_kset_s(fc, connections_subsys);
383 kobject_init(&fc->kobj);
095da6cb 384 atomic_set(&fc->num_waiting, 0);
d8a5ba45
MS
385 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
386 fc->bdi.unplug_io_fn = default_unplug_io_fn;
334f485d 387 fc->reqctr = 0;
08a53cdc 388 fc->blocked = 1;
d8a5ba45
MS
389 }
390 return fc;
391}
392
d8a5ba45
MS
393static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
394{
395 struct fuse_attr attr;
396 memset(&attr, 0, sizeof(attr));
397
398 attr.mode = mode;
399 attr.ino = FUSE_ROOT_ID;
9e6268db 400 return fuse_iget(sb, 1, 0, &attr);
d8a5ba45
MS
401}
402
403static struct super_operations fuse_super_operations = {
404 .alloc_inode = fuse_alloc_inode,
405 .destroy_inode = fuse_destroy_inode,
406 .read_inode = fuse_read_inode,
407 .clear_inode = fuse_clear_inode,
408 .put_super = fuse_put_super,
69a53bf2 409 .umount_begin = fuse_umount_begin,
e5e5558e 410 .statfs = fuse_statfs,
d8a5ba45
MS
411 .show_options = fuse_show_options,
412};
413
9b9a0469
MS
414static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
415{
9b9a0469
MS
416 struct fuse_init_out *arg = &req->misc.init_out;
417
418 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
419 fc->conn_error = 1;
420 else {
9cd68455
MS
421 unsigned long ra_pages;
422
423 if (arg->minor >= 6) {
424 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
425 if (arg->flags & FUSE_ASYNC_READ)
426 fc->async_read = 1;
427 } else
428 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
429
430 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
9b9a0469
MS
431 fc->minor = arg->minor;
432 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
433 }
9b9a0469 434 fuse_put_request(fc, req);
08a53cdc
MS
435 fc->blocked = 0;
436 wake_up_all(&fc->blocked_waitq);
9b9a0469
MS
437}
438
ce1d5a49 439static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
9b9a0469 440{
9b9a0469 441 struct fuse_init_in *arg = &req->misc.init_in;
095da6cb 442
9b9a0469
MS
443 arg->major = FUSE_KERNEL_VERSION;
444 arg->minor = FUSE_KERNEL_MINOR_VERSION;
9cd68455
MS
445 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
446 arg->flags |= FUSE_ASYNC_READ;
9b9a0469
MS
447 req->in.h.opcode = FUSE_INIT;
448 req->in.numargs = 1;
449 req->in.args[0].size = sizeof(*arg);
450 req->in.args[0].value = arg;
451 req->out.numargs = 1;
452 /* Variable length arguement used for backward compatibility
453 with interface version < 7.5. Rest of init_out is zeroed
454 by do_get_request(), so a short reply is not a problem */
455 req->out.argvar = 1;
456 req->out.args[0].size = sizeof(struct fuse_init_out);
457 req->out.args[0].value = &req->misc.init_out;
458 req->end = process_init_reply;
459 request_send_background(fc, req);
460}
461
f543f253
MS
462static unsigned long long conn_id(void)
463{
0720b315 464 /* BKL is held for ->get_sb() */
f543f253 465 static unsigned long long ctr = 1;
0720b315 466 return ctr++;
f543f253
MS
467}
468
d8a5ba45
MS
469static int fuse_fill_super(struct super_block *sb, void *data, int silent)
470{
471 struct fuse_conn *fc;
472 struct inode *root;
473 struct fuse_mount_data d;
474 struct file *file;
f543f253 475 struct dentry *root_dentry;
ce1d5a49 476 struct fuse_req *init_req;
d8a5ba45
MS
477 int err;
478
479 if (!parse_fuse_opt((char *) data, &d))
480 return -EINVAL;
481
482 sb->s_blocksize = PAGE_CACHE_SIZE;
483 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
484 sb->s_magic = FUSE_SUPER_MAGIC;
485 sb->s_op = &fuse_super_operations;
486 sb->s_maxbytes = MAX_LFS_FILESIZE;
487
488 file = fget(d.fd);
489 if (!file)
490 return -EINVAL;
491
0720b315
MS
492 if (file->f_op != &fuse_dev_operations)
493 return -EINVAL;
494
0720b315
MS
495 fc = new_conn();
496 if (!fc)
497 return -ENOMEM;
d8a5ba45 498
1e9a4ed9 499 fc->flags = d.flags;
d8a5ba45 500 fc->user_id = d.user_id;
87729a55 501 fc->group_id = d.group_id;
db50b96c 502 fc->max_read = d.max_read;
d8a5ba45 503
f543f253
MS
504 /* Used by get_root_inode() */
505 sb->s_fs_info = fc;
506
d8a5ba45
MS
507 err = -ENOMEM;
508 root = get_root_inode(sb, d.rootmode);
f543f253 509 if (!root)
d8a5ba45
MS
510 goto err;
511
f543f253
MS
512 root_dentry = d_alloc_root(root);
513 if (!root_dentry) {
d8a5ba45
MS
514 iput(root);
515 goto err;
516 }
f543f253 517
ce1d5a49
MS
518 init_req = fuse_request_alloc();
519 if (!init_req)
520 goto err_put_root;
521
f543f253
MS
522 err = kobject_set_name(&fc->kobj, "%llu", conn_id());
523 if (err)
ce1d5a49 524 goto err_free_req;
f543f253
MS
525
526 err = kobject_add(&fc->kobj);
527 if (err)
ce1d5a49 528 goto err_free_req;
f543f253 529
8aa09a50
MS
530 /* Setting file->private_data can't race with other mount()
531 instances, since BKL is held for ->get_sb() */
532 err = -EINVAL;
533 if (file->private_data)
534 goto err_kobject_del;
535
f543f253 536 sb->s_root = root_dentry;
f543f253 537 fc->connected = 1;
0720b315
MS
538 kobject_get(&fc->kobj);
539 file->private_data = fc;
540 /*
541 * atomic_dec_and_test() in fput() provides the necessary
542 * memory barrier for file->private_data to be visible on all
543 * CPUs after this
544 */
545 fput(file);
f543f253 546
ce1d5a49 547 fuse_send_init(fc, init_req);
f543f253 548
d8a5ba45
MS
549 return 0;
550
8aa09a50
MS
551 err_kobject_del:
552 kobject_del(&fc->kobj);
ce1d5a49
MS
553 err_free_req:
554 fuse_request_free(init_req);
f543f253
MS
555 err_put_root:
556 dput(root_dentry);
d8a5ba45 557 err:
0720b315 558 fput(file);
f543f253 559 kobject_put(&fc->kobj);
d8a5ba45
MS
560 return err;
561}
562
454e2398
DH
563static int fuse_get_sb(struct file_system_type *fs_type,
564 int flags, const char *dev_name,
565 void *raw_data, struct vfsmount *mnt)
d8a5ba45 566{
454e2398 567 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
d8a5ba45
MS
568}
569
570static struct file_system_type fuse_fs_type = {
571 .owner = THIS_MODULE,
572 .name = "fuse",
573 .get_sb = fuse_get_sb,
574 .kill_sb = kill_anon_super,
575};
576
0cd5b885
MS
577static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page)
578{
579 return sprintf(page, "%i\n", atomic_read(&fc->num_waiting));
580}
581
69a53bf2
MS
582static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page,
583 size_t count)
584{
585 fuse_abort_conn(fc);
586 return count;
587}
588
0cd5b885
MS
589static struct fuse_conn_attr fuse_conn_waiting =
590 __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL);
69a53bf2
MS
591static struct fuse_conn_attr fuse_conn_abort =
592 __ATTR(abort, 0600, NULL, fuse_conn_abort_store);
0cd5b885 593
f543f253 594static struct attribute *fuse_conn_attrs[] = {
0cd5b885 595 &fuse_conn_waiting.attr,
69a53bf2 596 &fuse_conn_abort.attr,
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597 NULL,
598};
599
600static ssize_t fuse_conn_attr_show(struct kobject *kobj,
601 struct attribute *attr,
602 char *page)
603{
604 struct fuse_conn_attr *fca =
605 container_of(attr, struct fuse_conn_attr, attr);
606
607 if (fca->show)
608 return fca->show(get_fuse_conn_kobj(kobj), page);
609 else
610 return -EACCES;
611}
612
613static ssize_t fuse_conn_attr_store(struct kobject *kobj,
614 struct attribute *attr,
615 const char *page, size_t count)
616{
617 struct fuse_conn_attr *fca =
618 container_of(attr, struct fuse_conn_attr, attr);
619
620 if (fca->store)
621 return fca->store(get_fuse_conn_kobj(kobj), page, count);
622 else
623 return -EACCES;
624}
625
626static struct sysfs_ops fuse_conn_sysfs_ops = {
627 .show = &fuse_conn_attr_show,
628 .store = &fuse_conn_attr_store,
629};
630
631static struct kobj_type ktype_fuse_conn = {
632 .release = fuse_conn_release,
633 .sysfs_ops = &fuse_conn_sysfs_ops,
634 .default_attrs = fuse_conn_attrs,
635};
636
637static decl_subsys(fuse, NULL, NULL);
638static decl_subsys(connections, &ktype_fuse_conn, NULL);
639
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640static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
641 unsigned long flags)
642{
643 struct inode * inode = foo;
644
645 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
646 SLAB_CTOR_CONSTRUCTOR)
647 inode_init_once(inode);
648}
649
650static int __init fuse_fs_init(void)
651{
652 int err;
653
654 err = register_filesystem(&fuse_fs_type);
655 if (err)
656 printk("fuse: failed to register filesystem\n");
657 else {
658 fuse_inode_cachep = kmem_cache_create("fuse_inode",
659 sizeof(struct fuse_inode),
660 0, SLAB_HWCACHE_ALIGN,
661 fuse_inode_init_once, NULL);
662 if (!fuse_inode_cachep) {
663 unregister_filesystem(&fuse_fs_type);
664 err = -ENOMEM;
665 }
666 }
667
668 return err;
669}
670
671static void fuse_fs_cleanup(void)
672{
673 unregister_filesystem(&fuse_fs_type);
674 kmem_cache_destroy(fuse_inode_cachep);
675}
676
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677static int fuse_sysfs_init(void)
678{
679 int err;
680
681 kset_set_kset_s(&fuse_subsys, fs_subsys);
682 err = subsystem_register(&fuse_subsys);
683 if (err)
684 goto out_err;
685
686 kset_set_kset_s(&connections_subsys, fuse_subsys);
687 err = subsystem_register(&connections_subsys);
688 if (err)
689 goto out_fuse_unregister;
690
691 return 0;
692
693 out_fuse_unregister:
694 subsystem_unregister(&fuse_subsys);
695 out_err:
696 return err;
697}
698
699static void fuse_sysfs_cleanup(void)
700{
701 subsystem_unregister(&connections_subsys);
702 subsystem_unregister(&fuse_subsys);
703}
704
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705static int __init fuse_init(void)
706{
707 int res;
708
709 printk("fuse init (API version %i.%i)\n",
710 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
711
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712 res = fuse_fs_init();
713 if (res)
714 goto err;
715
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716 res = fuse_dev_init();
717 if (res)
718 goto err_fs_cleanup;
719
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720 res = fuse_sysfs_init();
721 if (res)
722 goto err_dev_cleanup;
723
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724 return 0;
725
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726 err_dev_cleanup:
727 fuse_dev_cleanup();
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728 err_fs_cleanup:
729 fuse_fs_cleanup();
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730 err:
731 return res;
732}
733
734static void __exit fuse_exit(void)
735{
736 printk(KERN_DEBUG "fuse exit\n");
737
f543f253 738 fuse_sysfs_cleanup();
d8a5ba45 739 fuse_fs_cleanup();
334f485d 740 fuse_dev_cleanup();
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741}
742
743module_init(fuse_init);
744module_exit(fuse_exit);