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Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001/*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
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>
14#include <linux/mount.h>
15#include <linux/seq_file.h>
16#include <linux/init.h>
17#include <linux/module.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070018#include <linux/parser.h>
19#include <linux/statfs.h>
20
21MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
22MODULE_DESCRIPTION("Filesystem in Userspace");
23MODULE_LICENSE("GPL");
24
25spinlock_t fuse_lock;
26static kmem_cache_t *fuse_inode_cachep;
Miklos Szeredif543f252006-01-16 22:14:35 -080027static struct subsystem connections_subsys;
28
29struct fuse_conn_attr {
30 struct attribute attr;
31 ssize_t (*show)(struct fuse_conn *, char *);
32 ssize_t (*store)(struct fuse_conn *, const char *, size_t);
33};
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070034
35#define FUSE_SUPER_MAGIC 0x65735546
36
37struct fuse_mount_data {
38 int fd;
39 unsigned rootmode;
40 unsigned user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -070041 unsigned group_id;
Miklos Szeredi5a533682005-09-09 13:10:34 -070042 unsigned fd_present : 1;
43 unsigned rootmode_present : 1;
44 unsigned user_id_present : 1;
45 unsigned group_id_present : 1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -070046 unsigned flags;
Miklos Szeredidb50b962005-09-09 13:10:33 -070047 unsigned max_read;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070048};
49
50static struct inode *fuse_alloc_inode(struct super_block *sb)
51{
52 struct inode *inode;
53 struct fuse_inode *fi;
54
55 inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
56 if (!inode)
57 return NULL;
58
59 fi = get_fuse_inode(inode);
60 fi->i_time = jiffies - 1;
61 fi->nodeid = 0;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070062 fi->nlookup = 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -070063 fi->forget_req = fuse_request_alloc();
64 if (!fi->forget_req) {
65 kmem_cache_free(fuse_inode_cachep, inode);
66 return NULL;
67 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070068
69 return inode;
70}
71
72static void fuse_destroy_inode(struct inode *inode)
73{
Miklos Szeredie5e55582005-09-09 13:10:28 -070074 struct fuse_inode *fi = get_fuse_inode(inode);
75 if (fi->forget_req)
76 fuse_request_free(fi->forget_req);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070077 kmem_cache_free(fuse_inode_cachep, inode);
78}
79
80static void fuse_read_inode(struct inode *inode)
81{
82 /* No op */
83}
84
Miklos Szeredie5e55582005-09-09 13:10:28 -070085void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070086 unsigned long nodeid, u64 nlookup)
Miklos Szeredie5e55582005-09-09 13:10:28 -070087{
88 struct fuse_forget_in *inarg = &req->misc.forget_in;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070089 inarg->nlookup = nlookup;
Miklos Szeredie5e55582005-09-09 13:10:28 -070090 req->in.h.opcode = FUSE_FORGET;
91 req->in.h.nodeid = nodeid;
92 req->in.numargs = 1;
93 req->in.args[0].size = sizeof(struct fuse_forget_in);
94 req->in.args[0].value = inarg;
95 request_send_noreply(fc, req);
96}
97
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070098static void fuse_clear_inode(struct inode *inode)
99{
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700100 if (inode->i_sb->s_flags & MS_ACTIVE) {
101 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700102 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700103 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700104 fi->forget_req = NULL;
105 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700106}
107
108void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
109{
110 if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
111 invalidate_inode_pages(inode->i_mapping);
112
113 inode->i_ino = attr->ino;
114 inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
115 inode->i_nlink = attr->nlink;
116 inode->i_uid = attr->uid;
117 inode->i_gid = attr->gid;
118 i_size_write(inode, attr->size);
119 inode->i_blksize = PAGE_CACHE_SIZE;
120 inode->i_blocks = attr->blocks;
121 inode->i_atime.tv_sec = attr->atime;
122 inode->i_atime.tv_nsec = attr->atimensec;
123 inode->i_mtime.tv_sec = attr->mtime;
124 inode->i_mtime.tv_nsec = attr->mtimensec;
125 inode->i_ctime.tv_sec = attr->ctime;
126 inode->i_ctime.tv_nsec = attr->ctimensec;
127}
128
129static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
130{
131 inode->i_mode = attr->mode & S_IFMT;
132 i_size_write(inode, attr->size);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700133 if (S_ISREG(inode->i_mode)) {
134 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700135 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700136 } else if (S_ISDIR(inode->i_mode))
137 fuse_init_dir(inode);
138 else if (S_ISLNK(inode->i_mode))
139 fuse_init_symlink(inode);
140 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
141 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
142 fuse_init_common(inode);
143 init_special_inode(inode, inode->i_mode,
144 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800145 } else
146 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700147}
148
149static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
150{
151 unsigned long nodeid = *(unsigned long *) _nodeidp;
152 if (get_node_id(inode) == nodeid)
153 return 1;
154 else
155 return 0;
156}
157
158static int fuse_inode_set(struct inode *inode, void *_nodeidp)
159{
160 unsigned long nodeid = *(unsigned long *) _nodeidp;
161 get_fuse_inode(inode)->nodeid = nodeid;
162 return 0;
163}
164
165struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700166 int generation, struct fuse_attr *attr)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700167{
168 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700169 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700170 struct fuse_conn *fc = get_fuse_conn_super(sb);
171 int retried = 0;
172
173 retry:
174 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
175 if (!inode)
176 return NULL;
177
178 if ((inode->i_state & I_NEW)) {
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700179 inode->i_flags |= S_NOATIME|S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700180 inode->i_generation = generation;
181 inode->i_data.backing_dev_info = &fc->bdi;
182 fuse_init_inode(inode, attr);
183 unlock_new_inode(inode);
184 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
185 BUG_ON(retried);
186 /* Inode has changed type, any I/O on the old should fail */
187 make_bad_inode(inode);
188 iput(inode);
189 retried = 1;
190 goto retry;
191 }
192
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700193 fi = get_fuse_inode(inode);
194 fi->nlookup ++;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700195 fuse_change_attributes(inode, attr);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700196 return inode;
197}
198
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800199static void fuse_umount_begin(struct super_block *sb)
200{
201 fuse_abort_conn(get_fuse_conn_super(sb));
202}
203
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700204static void fuse_put_super(struct super_block *sb)
205{
206 struct fuse_conn *fc = get_fuse_conn_super(sb);
207
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700208 down_write(&fc->sbput_sem);
209 while (!list_empty(&fc->background))
210 fuse_release_background(list_entry(fc->background.next,
211 struct fuse_req, bg_entry));
212
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700213 spin_lock(&fuse_lock);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700214 fc->mounted = 0;
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800215 fc->connected = 0;
Miklos Szeredif543f252006-01-16 22:14:35 -0800216 spin_unlock(&fuse_lock);
217 up_write(&fc->sbput_sem);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700218 /* Flush all readers on this fs */
219 wake_up_all(&fc->waitq);
Miklos Szeredif543f252006-01-16 22:14:35 -0800220 kobject_del(&fc->kobj);
221 kobject_put(&fc->kobj);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700222}
223
Miklos Szeredie5e55582005-09-09 13:10:28 -0700224static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
225{
226 stbuf->f_type = FUSE_SUPER_MAGIC;
227 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800228 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700229 stbuf->f_blocks = attr->blocks;
230 stbuf->f_bfree = attr->bfree;
231 stbuf->f_bavail = attr->bavail;
232 stbuf->f_files = attr->files;
233 stbuf->f_ffree = attr->ffree;
234 stbuf->f_namelen = attr->namelen;
235 /* fsid is left zero */
236}
237
238static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
239{
240 struct fuse_conn *fc = get_fuse_conn_super(sb);
241 struct fuse_req *req;
242 struct fuse_statfs_out outarg;
243 int err;
244
245 req = fuse_get_request(fc);
246 if (!req)
Miklos Szeredi7c352bd2005-09-09 13:10:39 -0700247 return -EINTR;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700248
Miklos Szeredide5f1202006-01-06 00:19:37 -0800249 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700250 req->in.numargs = 0;
251 req->in.h.opcode = FUSE_STATFS;
252 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800253 req->out.args[0].size =
254 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700255 req->out.args[0].value = &outarg;
256 request_send(fc, req);
257 err = req->out.h.error;
258 if (!err)
259 convert_fuse_statfs(buf, &outarg.st);
260 fuse_put_request(fc, req);
261 return err;
262}
263
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700264enum {
265 OPT_FD,
266 OPT_ROOTMODE,
267 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700268 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700269 OPT_DEFAULT_PERMISSIONS,
270 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700271 OPT_MAX_READ,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700272 OPT_ERR
273};
274
275static match_table_t tokens = {
276 {OPT_FD, "fd=%u"},
277 {OPT_ROOTMODE, "rootmode=%o"},
278 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700279 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700280 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
281 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700282 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700283 {OPT_ERR, NULL}
284};
285
286static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
287{
288 char *p;
289 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700290 d->max_read = ~0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700291
292 while ((p = strsep(&opt, ",")) != NULL) {
293 int token;
294 int value;
295 substring_t args[MAX_OPT_ARGS];
296 if (!*p)
297 continue;
298
299 token = match_token(p, tokens, args);
300 switch (token) {
301 case OPT_FD:
302 if (match_int(&args[0], &value))
303 return 0;
304 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700305 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700306 break;
307
308 case OPT_ROOTMODE:
309 if (match_octal(&args[0], &value))
310 return 0;
311 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700312 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700313 break;
314
315 case OPT_USER_ID:
316 if (match_int(&args[0], &value))
317 return 0;
318 d->user_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700319 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700320 break;
321
Miklos Szeredi87729a52005-09-09 13:10:34 -0700322 case OPT_GROUP_ID:
323 if (match_int(&args[0], &value))
324 return 0;
325 d->group_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700326 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700327 break;
328
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700329 case OPT_DEFAULT_PERMISSIONS:
330 d->flags |= FUSE_DEFAULT_PERMISSIONS;
331 break;
332
333 case OPT_ALLOW_OTHER:
334 d->flags |= FUSE_ALLOW_OTHER;
335 break;
336
Miklos Szeredidb50b962005-09-09 13:10:33 -0700337 case OPT_MAX_READ:
338 if (match_int(&args[0], &value))
339 return 0;
340 d->max_read = value;
341 break;
342
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700343 default:
344 return 0;
345 }
346 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700347
348 if (!d->fd_present || !d->rootmode_present ||
349 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700350 return 0;
351
352 return 1;
353}
354
355static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
356{
357 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
358
359 seq_printf(m, ",user_id=%u", fc->user_id);
Miklos Szeredi87729a52005-09-09 13:10:34 -0700360 seq_printf(m, ",group_id=%u", fc->group_id);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700361 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
362 seq_puts(m, ",default_permissions");
363 if (fc->flags & FUSE_ALLOW_OTHER)
364 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700365 if (fc->max_read != ~0)
366 seq_printf(m, ",max_read=%u", fc->max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700367 return 0;
368}
369
Miklos Szeredif543f252006-01-16 22:14:35 -0800370static void fuse_conn_release(struct kobject *kobj)
Miklos Szeredi334f4852005-09-09 13:10:27 -0700371{
Miklos Szeredif543f252006-01-16 22:14:35 -0800372 struct fuse_conn *fc = get_fuse_conn_kobj(kobj);
373
Miklos Szeredi334f4852005-09-09 13:10:27 -0700374 while (!list_empty(&fc->unused_list)) {
375 struct fuse_req *req;
376 req = list_entry(fc->unused_list.next, struct fuse_req, list);
377 list_del(&req->list);
378 fuse_request_free(req);
379 }
380 kfree(fc);
381}
382
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700383static struct fuse_conn *new_conn(void)
384{
385 struct fuse_conn *fc;
386
Miklos Szeredi6383bda2006-01-16 22:14:29 -0800387 fc = kzalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredif543f252006-01-16 22:14:35 -0800388 if (fc) {
Miklos Szeredi334f4852005-09-09 13:10:27 -0700389 int i;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700390 init_waitqueue_head(&fc->waitq);
391 INIT_LIST_HEAD(&fc->pending);
392 INIT_LIST_HEAD(&fc->processing);
Miklos Szeredid77a1d52006-01-16 22:14:31 -0800393 INIT_LIST_HEAD(&fc->io);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700394 INIT_LIST_HEAD(&fc->unused_list);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700395 INIT_LIST_HEAD(&fc->background);
Miklos Szeredi6383bda2006-01-16 22:14:29 -0800396 sema_init(&fc->outstanding_sem, 1); /* One for INIT */
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700397 init_rwsem(&fc->sbput_sem);
Miklos Szeredif543f252006-01-16 22:14:35 -0800398 kobj_set_kset_s(fc, connections_subsys);
399 kobject_init(&fc->kobj);
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800400 atomic_set(&fc->num_waiting, 0);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700401 for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
402 struct fuse_req *req = fuse_request_alloc();
403 if (!req) {
Miklos Szeredif543f252006-01-16 22:14:35 -0800404 kobject_put(&fc->kobj);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700405 return NULL;
406 }
407 list_add(&req->list, &fc->unused_list);
408 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700409 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
410 fc->bdi.unplug_io_fn = default_unplug_io_fn;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700411 fc->reqctr = 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700412 }
413 return fc;
414}
415
416static struct fuse_conn *get_conn(struct file *file, struct super_block *sb)
417{
418 struct fuse_conn *fc;
Miklos Szeredif543f252006-01-16 22:14:35 -0800419 int err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700420
Miklos Szeredif543f252006-01-16 22:14:35 -0800421 err = -EINVAL;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700422 if (file->f_op != &fuse_dev_operations)
Miklos Szeredif543f252006-01-16 22:14:35 -0800423 goto out_err;
424
425 err = -ENOMEM;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700426 fc = new_conn();
Miklos Szeredif543f252006-01-16 22:14:35 -0800427 if (!fc)
428 goto out_err;
429
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700430 spin_lock(&fuse_lock);
Miklos Szeredif543f252006-01-16 22:14:35 -0800431 err = -EINVAL;
432 if (file->private_data)
433 goto out_unlock;
434
435 kobject_get(&fc->kobj);
436 file->private_data = fc;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700437 spin_unlock(&fuse_lock);
438 return fc;
Miklos Szeredif543f252006-01-16 22:14:35 -0800439
440 out_unlock:
441 spin_unlock(&fuse_lock);
442 kobject_put(&fc->kobj);
443 out_err:
444 return ERR_PTR(err);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700445}
446
447static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
448{
449 struct fuse_attr attr;
450 memset(&attr, 0, sizeof(attr));
451
452 attr.mode = mode;
453 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700454 return fuse_iget(sb, 1, 0, &attr);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700455}
456
457static struct super_operations fuse_super_operations = {
458 .alloc_inode = fuse_alloc_inode,
459 .destroy_inode = fuse_destroy_inode,
460 .read_inode = fuse_read_inode,
461 .clear_inode = fuse_clear_inode,
462 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800463 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700464 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700465 .show_options = fuse_show_options,
466};
467
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800468static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
469{
470 int i;
471 struct fuse_init_out *arg = &req->misc.init_out;
472
473 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
474 fc->conn_error = 1;
475 else {
476 fc->minor = arg->minor;
477 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
478 }
479
480 /* After INIT reply is received other requests can go
481 out. So do (FUSE_MAX_OUTSTANDING - 1) number of
482 up()s on outstanding_sem. The last up() is done in
483 fuse_putback_request() */
484 for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)
485 up(&fc->outstanding_sem);
486
487 fuse_put_request(fc, req);
488}
489
490static void fuse_send_init(struct fuse_conn *fc)
491{
492 /* This is called from fuse_read_super() so there's guaranteed
493 to be exactly one request available */
494 struct fuse_req *req = fuse_get_request(fc);
495 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800496
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800497 arg->major = FUSE_KERNEL_VERSION;
498 arg->minor = FUSE_KERNEL_MINOR_VERSION;
499 req->in.h.opcode = FUSE_INIT;
500 req->in.numargs = 1;
501 req->in.args[0].size = sizeof(*arg);
502 req->in.args[0].value = arg;
503 req->out.numargs = 1;
504 /* Variable length arguement used for backward compatibility
505 with interface version < 7.5. Rest of init_out is zeroed
506 by do_get_request(), so a short reply is not a problem */
507 req->out.argvar = 1;
508 req->out.args[0].size = sizeof(struct fuse_init_out);
509 req->out.args[0].value = &req->misc.init_out;
510 req->end = process_init_reply;
511 request_send_background(fc, req);
512}
513
Miklos Szeredif543f252006-01-16 22:14:35 -0800514static unsigned long long conn_id(void)
515{
516 static unsigned long long ctr = 1;
517 unsigned long long val;
518 spin_lock(&fuse_lock);
519 val = ctr++;
520 spin_unlock(&fuse_lock);
521 return val;
522}
523
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700524static int fuse_fill_super(struct super_block *sb, void *data, int silent)
525{
526 struct fuse_conn *fc;
527 struct inode *root;
528 struct fuse_mount_data d;
529 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800530 struct dentry *root_dentry;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700531 int err;
532
533 if (!parse_fuse_opt((char *) data, &d))
534 return -EINVAL;
535
536 sb->s_blocksize = PAGE_CACHE_SIZE;
537 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
538 sb->s_magic = FUSE_SUPER_MAGIC;
539 sb->s_op = &fuse_super_operations;
540 sb->s_maxbytes = MAX_LFS_FILESIZE;
541
542 file = fget(d.fd);
543 if (!file)
544 return -EINVAL;
545
546 fc = get_conn(file, sb);
547 fput(file);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700548 if (IS_ERR(fc))
549 return PTR_ERR(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700550
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700551 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700552 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700553 fc->group_id = d.group_id;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700554 fc->max_read = d.max_read;
555 if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
556 fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700557
Miklos Szeredif543f252006-01-16 22:14:35 -0800558 /* Used by get_root_inode() */
559 sb->s_fs_info = fc;
560
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700561 err = -ENOMEM;
562 root = get_root_inode(sb, d.rootmode);
Miklos Szeredif543f252006-01-16 22:14:35 -0800563 if (!root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700564 goto err;
565
Miklos Szeredif543f252006-01-16 22:14:35 -0800566 root_dentry = d_alloc_root(root);
567 if (!root_dentry) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700568 iput(root);
569 goto err;
570 }
Miklos Szeredif543f252006-01-16 22:14:35 -0800571
572 err = kobject_set_name(&fc->kobj, "%llu", conn_id());
573 if (err)
574 goto err_put_root;
575
576 err = kobject_add(&fc->kobj);
577 if (err)
578 goto err_put_root;
579
580 sb->s_root = root_dentry;
581 spin_lock(&fuse_lock);
582 fc->mounted = 1;
583 fc->connected = 1;
584 spin_unlock(&fuse_lock);
585
Miklos Szeredi334f4852005-09-09 13:10:27 -0700586 fuse_send_init(fc);
Miklos Szeredif543f252006-01-16 22:14:35 -0800587
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700588 return 0;
589
Miklos Szeredif543f252006-01-16 22:14:35 -0800590 err_put_root:
591 dput(root_dentry);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700592 err:
Miklos Szeredif543f252006-01-16 22:14:35 -0800593 kobject_put(&fc->kobj);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700594 return err;
595}
596
597static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
598 int flags, const char *dev_name,
599 void *raw_data)
600{
601 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
602}
603
604static struct file_system_type fuse_fs_type = {
605 .owner = THIS_MODULE,
606 .name = "fuse",
607 .get_sb = fuse_get_sb,
608 .kill_sb = kill_anon_super,
609};
610
Miklos Szeredi0cd5b882006-01-16 22:14:38 -0800611static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page)
612{
613 return sprintf(page, "%i\n", atomic_read(&fc->num_waiting));
614}
615
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800616static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page,
617 size_t count)
618{
619 fuse_abort_conn(fc);
620 return count;
621}
622
Miklos Szeredi0cd5b882006-01-16 22:14:38 -0800623static struct fuse_conn_attr fuse_conn_waiting =
624 __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL);
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800625static struct fuse_conn_attr fuse_conn_abort =
626 __ATTR(abort, 0600, NULL, fuse_conn_abort_store);
Miklos Szeredi0cd5b882006-01-16 22:14:38 -0800627
Miklos Szeredif543f252006-01-16 22:14:35 -0800628static struct attribute *fuse_conn_attrs[] = {
Miklos Szeredi0cd5b882006-01-16 22:14:38 -0800629 &fuse_conn_waiting.attr,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800630 &fuse_conn_abort.attr,
Miklos Szeredif543f252006-01-16 22:14:35 -0800631 NULL,
632};
633
634static ssize_t fuse_conn_attr_show(struct kobject *kobj,
635 struct attribute *attr,
636 char *page)
637{
638 struct fuse_conn_attr *fca =
639 container_of(attr, struct fuse_conn_attr, attr);
640
641 if (fca->show)
642 return fca->show(get_fuse_conn_kobj(kobj), page);
643 else
644 return -EACCES;
645}
646
647static ssize_t fuse_conn_attr_store(struct kobject *kobj,
648 struct attribute *attr,
649 const char *page, size_t count)
650{
651 struct fuse_conn_attr *fca =
652 container_of(attr, struct fuse_conn_attr, attr);
653
654 if (fca->store)
655 return fca->store(get_fuse_conn_kobj(kobj), page, count);
656 else
657 return -EACCES;
658}
659
660static struct sysfs_ops fuse_conn_sysfs_ops = {
661 .show = &fuse_conn_attr_show,
662 .store = &fuse_conn_attr_store,
663};
664
665static struct kobj_type ktype_fuse_conn = {
666 .release = fuse_conn_release,
667 .sysfs_ops = &fuse_conn_sysfs_ops,
668 .default_attrs = fuse_conn_attrs,
669};
670
671static decl_subsys(fuse, NULL, NULL);
672static decl_subsys(connections, &ktype_fuse_conn, NULL);
673
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700674static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
675 unsigned long flags)
676{
677 struct inode * inode = foo;
678
679 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
680 SLAB_CTOR_CONSTRUCTOR)
681 inode_init_once(inode);
682}
683
684static int __init fuse_fs_init(void)
685{
686 int err;
687
688 err = register_filesystem(&fuse_fs_type);
689 if (err)
690 printk("fuse: failed to register filesystem\n");
691 else {
692 fuse_inode_cachep = kmem_cache_create("fuse_inode",
693 sizeof(struct fuse_inode),
694 0, SLAB_HWCACHE_ALIGN,
695 fuse_inode_init_once, NULL);
696 if (!fuse_inode_cachep) {
697 unregister_filesystem(&fuse_fs_type);
698 err = -ENOMEM;
699 }
700 }
701
702 return err;
703}
704
705static void fuse_fs_cleanup(void)
706{
707 unregister_filesystem(&fuse_fs_type);
708 kmem_cache_destroy(fuse_inode_cachep);
709}
710
Miklos Szeredif543f252006-01-16 22:14:35 -0800711static int fuse_sysfs_init(void)
712{
713 int err;
714
715 kset_set_kset_s(&fuse_subsys, fs_subsys);
716 err = subsystem_register(&fuse_subsys);
717 if (err)
718 goto out_err;
719
720 kset_set_kset_s(&connections_subsys, fuse_subsys);
721 err = subsystem_register(&connections_subsys);
722 if (err)
723 goto out_fuse_unregister;
724
725 return 0;
726
727 out_fuse_unregister:
728 subsystem_unregister(&fuse_subsys);
729 out_err:
730 return err;
731}
732
733static void fuse_sysfs_cleanup(void)
734{
735 subsystem_unregister(&connections_subsys);
736 subsystem_unregister(&fuse_subsys);
737}
738
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700739static int __init fuse_init(void)
740{
741 int res;
742
743 printk("fuse init (API version %i.%i)\n",
744 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
745
746 spin_lock_init(&fuse_lock);
747 res = fuse_fs_init();
748 if (res)
749 goto err;
750
Miklos Szeredi334f4852005-09-09 13:10:27 -0700751 res = fuse_dev_init();
752 if (res)
753 goto err_fs_cleanup;
754
Miklos Szeredif543f252006-01-16 22:14:35 -0800755 res = fuse_sysfs_init();
756 if (res)
757 goto err_dev_cleanup;
758
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700759 return 0;
760
Miklos Szeredif543f252006-01-16 22:14:35 -0800761 err_dev_cleanup:
762 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -0700763 err_fs_cleanup:
764 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700765 err:
766 return res;
767}
768
769static void __exit fuse_exit(void)
770{
771 printk(KERN_DEBUG "fuse exit\n");
772
Miklos Szeredif543f252006-01-16 22:14:35 -0800773 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700774 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -0700775 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700776}
777
778module_init(fuse_init);
779module_exit(fuse_exit);