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Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001/*
2 FUSE: Filesystem in Userspace
Miklos Szeredid7133112006-04-10 22:54:55 -07003 Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07004
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>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070014#include <linux/seq_file.h>
15#include <linux/init.h>
16#include <linux/module.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070017#include <linux/parser.h>
18#include <linux/statfs.h>
Miklos Szeredi9c8ef562006-06-25 05:48:55 -070019#include <linux/random.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040020#include <linux/sched.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070021
22MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
23MODULE_DESCRIPTION("Filesystem in Userspace");
24MODULE_LICENSE("GPL");
25
Christoph Lametere18b8902006-12-06 20:33:20 -080026static struct kmem_cache *fuse_inode_cachep;
Miklos Szeredibafa9652006-06-25 05:48:51 -070027struct list_head fuse_conn_list;
28DEFINE_MUTEX(fuse_mutex);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070029
30#define FUSE_SUPER_MAGIC 0x65735546
31
32struct fuse_mount_data {
33 int fd;
34 unsigned rootmode;
35 unsigned user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -070036 unsigned group_id;
Miklos Szeredi5a533682005-09-09 13:10:34 -070037 unsigned fd_present : 1;
38 unsigned rootmode_present : 1;
39 unsigned user_id_present : 1;
40 unsigned group_id_present : 1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -070041 unsigned flags;
Miklos Szeredidb50b962005-09-09 13:10:33 -070042 unsigned max_read;
Miklos Szeredid8091612006-12-06 20:35:48 -080043 unsigned blksize;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070044};
45
46static struct inode *fuse_alloc_inode(struct super_block *sb)
47{
48 struct inode *inode;
49 struct fuse_inode *fi;
50
Christoph Lametere94b1762006-12-06 20:33:17 -080051 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070052 if (!inode)
53 return NULL;
54
55 fi = get_fuse_inode(inode);
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070056 fi->i_time = 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070057 fi->nodeid = 0;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070058 fi->nlookup = 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -070059 fi->forget_req = fuse_request_alloc();
60 if (!fi->forget_req) {
61 kmem_cache_free(fuse_inode_cachep, inode);
62 return NULL;
63 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070064
65 return inode;
66}
67
68static void fuse_destroy_inode(struct inode *inode)
69{
Miklos Szeredie5e55582005-09-09 13:10:28 -070070 struct fuse_inode *fi = get_fuse_inode(inode);
71 if (fi->forget_req)
72 fuse_request_free(fi->forget_req);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070073 kmem_cache_free(fuse_inode_cachep, inode);
74}
75
76static void fuse_read_inode(struct inode *inode)
77{
78 /* No op */
79}
80
Miklos Szeredie5e55582005-09-09 13:10:28 -070081void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070082 unsigned long nodeid, u64 nlookup)
Miklos Szeredie5e55582005-09-09 13:10:28 -070083{
84 struct fuse_forget_in *inarg = &req->misc.forget_in;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070085 inarg->nlookup = nlookup;
Miklos Szeredie5e55582005-09-09 13:10:28 -070086 req->in.h.opcode = FUSE_FORGET;
87 req->in.h.nodeid = nodeid;
88 req->in.numargs = 1;
89 req->in.args[0].size = sizeof(struct fuse_forget_in);
90 req->in.args[0].value = inarg;
91 request_send_noreply(fc, req);
92}
93
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070094static void fuse_clear_inode(struct inode *inode)
95{
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -070096 if (inode->i_sb->s_flags & MS_ACTIVE) {
97 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -070098 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070099 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700100 fi->forget_req = NULL;
101 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700102}
103
Miklos Szeredi71421252006-06-25 05:48:52 -0700104static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
105{
106 if (*flags & MS_MANDLOCK)
107 return -EINVAL;
108
109 return 0;
110}
111
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700112void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
113{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700114 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700115 if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800116 invalidate_mapping_pages(inode->i_mapping, 0, -1);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700117
118 inode->i_ino = attr->ino;
119 inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
120 inode->i_nlink = attr->nlink;
121 inode->i_uid = attr->uid;
122 inode->i_gid = attr->gid;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700123 spin_lock(&fc->lock);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700124 i_size_write(inode, attr->size);
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700125 spin_unlock(&fc->lock);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700126 inode->i_blocks = attr->blocks;
127 inode->i_atime.tv_sec = attr->atime;
128 inode->i_atime.tv_nsec = attr->atimensec;
129 inode->i_mtime.tv_sec = attr->mtime;
130 inode->i_mtime.tv_nsec = attr->mtimensec;
131 inode->i_ctime.tv_sec = attr->ctime;
132 inode->i_ctime.tv_nsec = attr->ctimensec;
133}
134
135static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
136{
137 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700138 inode->i_size = attr->size;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700139 if (S_ISREG(inode->i_mode)) {
140 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700141 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700142 } else if (S_ISDIR(inode->i_mode))
143 fuse_init_dir(inode);
144 else if (S_ISLNK(inode->i_mode))
145 fuse_init_symlink(inode);
146 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
147 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
148 fuse_init_common(inode);
149 init_special_inode(inode, inode->i_mode,
150 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800151 } else
152 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700153}
154
155static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
156{
157 unsigned long nodeid = *(unsigned long *) _nodeidp;
158 if (get_node_id(inode) == nodeid)
159 return 1;
160 else
161 return 0;
162}
163
164static int fuse_inode_set(struct inode *inode, void *_nodeidp)
165{
166 unsigned long nodeid = *(unsigned long *) _nodeidp;
167 get_fuse_inode(inode)->nodeid = nodeid;
168 return 0;
169}
170
171struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700172 int generation, struct fuse_attr *attr)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700173{
174 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700175 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700176 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700177
178 retry:
179 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
180 if (!inode)
181 return NULL;
182
183 if ((inode->i_state & I_NEW)) {
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700184 inode->i_flags |= S_NOATIME|S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700185 inode->i_generation = generation;
186 inode->i_data.backing_dev_info = &fc->bdi;
187 fuse_init_inode(inode, attr);
188 unlock_new_inode(inode);
189 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700190 /* Inode has changed type, any I/O on the old should fail */
191 make_bad_inode(inode);
192 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700193 goto retry;
194 }
195
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700196 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700197 spin_lock(&fc->lock);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700198 fi->nlookup ++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700199 spin_unlock(&fc->lock);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700200 fuse_change_attributes(inode, attr);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700201 return inode;
202}
203
Trond Myklebust8b512d92006-06-09 09:34:18 -0400204static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800205{
Trond Myklebust8b512d92006-06-09 09:34:18 -0400206 if (flags & MNT_FORCE)
207 fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800208}
209
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800210static void fuse_send_destroy(struct fuse_conn *fc)
211{
212 struct fuse_req *req = fc->destroy_req;
213 if (req && fc->conn_init) {
214 fc->destroy_req = NULL;
215 req->in.h.opcode = FUSE_DESTROY;
216 req->force = 1;
217 request_send(fc, req);
218 fuse_put_request(fc, req);
219 }
220}
221
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700222static void fuse_put_super(struct super_block *sb)
223{
224 struct fuse_conn *fc = get_fuse_conn_super(sb);
225
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800226 fuse_send_destroy(fc);
Miklos Szeredid7133112006-04-10 22:54:55 -0700227 spin_lock(&fc->lock);
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800228 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700229 fc->blocked = 0;
Miklos Szeredid7133112006-04-10 22:54:55 -0700230 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700231 /* Flush all readers on this fs */
Jeff Dike385a17b2006-04-10 22:54:52 -0700232 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700233 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700234 wake_up_all(&fc->blocked_waitq);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700235 mutex_lock(&fuse_mutex);
236 list_del(&fc->entry);
237 fuse_ctl_remove_conn(fc);
238 mutex_unlock(&fuse_mutex);
239 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700240}
241
Miklos Szeredie5e55582005-09-09 13:10:28 -0700242static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
243{
244 stbuf->f_type = FUSE_SUPER_MAGIC;
245 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800246 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700247 stbuf->f_blocks = attr->blocks;
248 stbuf->f_bfree = attr->bfree;
249 stbuf->f_bavail = attr->bavail;
250 stbuf->f_files = attr->files;
251 stbuf->f_ffree = attr->ffree;
252 stbuf->f_namelen = attr->namelen;
253 /* fsid is left zero */
254}
255
David Howells726c3342006-06-23 02:02:58 -0700256static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700257{
David Howells726c3342006-06-23 02:02:58 -0700258 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700259 struct fuse_conn *fc = get_fuse_conn_super(sb);
260 struct fuse_req *req;
261 struct fuse_statfs_out outarg;
262 int err;
263
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700264 req = fuse_get_req(fc);
265 if (IS_ERR(req))
266 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700267
Miklos Szeredide5f1202006-01-06 00:19:37 -0800268 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700269 req->in.numargs = 0;
270 req->in.h.opcode = FUSE_STATFS;
Miklos Szeredi5b35e8e2006-09-29 01:59:34 -0700271 req->in.h.nodeid = get_node_id(dentry->d_inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700272 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800273 req->out.args[0].size =
274 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700275 req->out.args[0].value = &outarg;
276 request_send(fc, req);
277 err = req->out.h.error;
278 if (!err)
279 convert_fuse_statfs(buf, &outarg.st);
280 fuse_put_request(fc, req);
281 return err;
282}
283
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700284enum {
285 OPT_FD,
286 OPT_ROOTMODE,
287 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700288 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700289 OPT_DEFAULT_PERMISSIONS,
290 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700291 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800292 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700293 OPT_ERR
294};
295
296static match_table_t tokens = {
297 {OPT_FD, "fd=%u"},
298 {OPT_ROOTMODE, "rootmode=%o"},
299 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700300 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700301 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
302 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700303 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800304 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700305 {OPT_ERR, NULL}
306};
307
Miklos Szeredid8091612006-12-06 20:35:48 -0800308static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700309{
310 char *p;
311 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700312 d->max_read = ~0;
Miklos Szeredid8091612006-12-06 20:35:48 -0800313 d->blksize = 512;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700314
315 while ((p = strsep(&opt, ",")) != NULL) {
316 int token;
317 int value;
318 substring_t args[MAX_OPT_ARGS];
319 if (!*p)
320 continue;
321
322 token = match_token(p, tokens, args);
323 switch (token) {
324 case OPT_FD:
325 if (match_int(&args[0], &value))
326 return 0;
327 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700328 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700329 break;
330
331 case OPT_ROOTMODE:
332 if (match_octal(&args[0], &value))
333 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700334 if (!fuse_valid_type(value))
335 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700336 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700337 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700338 break;
339
340 case OPT_USER_ID:
341 if (match_int(&args[0], &value))
342 return 0;
343 d->user_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700344 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700345 break;
346
Miklos Szeredi87729a52005-09-09 13:10:34 -0700347 case OPT_GROUP_ID:
348 if (match_int(&args[0], &value))
349 return 0;
350 d->group_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700351 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700352 break;
353
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700354 case OPT_DEFAULT_PERMISSIONS:
355 d->flags |= FUSE_DEFAULT_PERMISSIONS;
356 break;
357
358 case OPT_ALLOW_OTHER:
359 d->flags |= FUSE_ALLOW_OTHER;
360 break;
361
Miklos Szeredidb50b962005-09-09 13:10:33 -0700362 case OPT_MAX_READ:
363 if (match_int(&args[0], &value))
364 return 0;
365 d->max_read = value;
366 break;
367
Miklos Szeredid8091612006-12-06 20:35:48 -0800368 case OPT_BLKSIZE:
369 if (!is_bdev || match_int(&args[0], &value))
370 return 0;
371 d->blksize = value;
372 break;
373
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700374 default:
375 return 0;
376 }
377 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700378
379 if (!d->fd_present || !d->rootmode_present ||
380 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700381 return 0;
382
383 return 1;
384}
385
386static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
387{
388 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
389
390 seq_printf(m, ",user_id=%u", fc->user_id);
Miklos Szeredi87729a52005-09-09 13:10:34 -0700391 seq_printf(m, ",group_id=%u", fc->group_id);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700392 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
393 seq_puts(m, ",default_permissions");
394 if (fc->flags & FUSE_ALLOW_OTHER)
395 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700396 if (fc->max_read != ~0)
397 seq_printf(m, ",max_read=%u", fc->max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700398 return 0;
399}
400
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700401static struct fuse_conn *new_conn(void)
402{
403 struct fuse_conn *fc;
404
Miklos Szeredi6383bda2006-01-16 22:14:29 -0800405 fc = kzalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredif543f252006-01-16 22:14:35 -0800406 if (fc) {
Miklos Szeredid7133112006-04-10 22:54:55 -0700407 spin_lock_init(&fc->lock);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700408 mutex_init(&fc->inst_mutex);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700409 atomic_set(&fc->count, 1);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700410 init_waitqueue_head(&fc->waitq);
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700411 init_waitqueue_head(&fc->blocked_waitq);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700412 INIT_LIST_HEAD(&fc->pending);
413 INIT_LIST_HEAD(&fc->processing);
Miklos Szeredid77a1d52006-01-16 22:14:31 -0800414 INIT_LIST_HEAD(&fc->io);
Miklos Szeredia4d27e72006-06-25 05:48:54 -0700415 INIT_LIST_HEAD(&fc->interrupts);
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800416 atomic_set(&fc->num_waiting, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700417 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
418 fc->bdi.unplug_io_fn = default_unplug_io_fn;
Miklos Szeredi334f4852005-09-09 13:10:27 -0700419 fc->reqctr = 0;
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700420 fc->blocked = 1;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700421 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700422 }
423 return fc;
424}
425
Miklos Szeredibafa9652006-06-25 05:48:51 -0700426void fuse_conn_put(struct fuse_conn *fc)
427{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700428 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800429 if (fc->destroy_req)
430 fuse_request_free(fc->destroy_req);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700431 mutex_destroy(&fc->inst_mutex);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700432 kfree(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700433 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700434}
435
436struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
437{
438 atomic_inc(&fc->count);
439 return fc;
440}
441
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700442static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
443{
444 struct fuse_attr attr;
445 memset(&attr, 0, sizeof(attr));
446
447 attr.mode = mode;
448 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700449 return fuse_iget(sb, 1, 0, &attr);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700450}
451
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800452static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700453 .alloc_inode = fuse_alloc_inode,
454 .destroy_inode = fuse_destroy_inode,
455 .read_inode = fuse_read_inode,
456 .clear_inode = fuse_clear_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700457 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700458 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700459 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800460 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700461 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700462 .show_options = fuse_show_options,
463};
464
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800465static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
466{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800467 struct fuse_init_out *arg = &req->misc.init_out;
468
469 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
470 fc->conn_error = 1;
471 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800472 unsigned long ra_pages;
473
474 if (arg->minor >= 6) {
475 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
476 if (arg->flags & FUSE_ASYNC_READ)
477 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700478 if (!(arg->flags & FUSE_POSIX_LOCKS))
479 fc->no_lock = 1;
480 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800481 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700482 fc->no_lock = 1;
483 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800484
485 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800486 fc->minor = arg->minor;
487 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800488 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800489 }
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800490 fuse_put_request(fc, req);
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700491 fc->blocked = 0;
492 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800493}
494
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700495static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800496{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800497 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800498
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800499 arg->major = FUSE_KERNEL_VERSION;
500 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800501 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700502 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800503 req->in.h.opcode = FUSE_INIT;
504 req->in.numargs = 1;
505 req->in.args[0].size = sizeof(*arg);
506 req->in.args[0].value = arg;
507 req->out.numargs = 1;
508 /* Variable length arguement used for backward compatibility
509 with interface version < 7.5. Rest of init_out is zeroed
510 by do_get_request(), so a short reply is not a problem */
511 req->out.argvar = 1;
512 req->out.args[0].size = sizeof(struct fuse_init_out);
513 req->out.args[0].value = &req->misc.init_out;
514 req->end = process_init_reply;
515 request_send_background(fc, req);
516}
517
Miklos Szeredibafa9652006-06-25 05:48:51 -0700518static u64 conn_id(void)
Miklos Szeredif543f252006-01-16 22:14:35 -0800519{
Miklos Szeredibafa9652006-06-25 05:48:51 -0700520 static u64 ctr = 1;
Miklos Szeredi0720b312006-04-10 22:54:55 -0700521 return ctr++;
Miklos Szeredif543f252006-01-16 22:14:35 -0800522}
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 Szeredice1d5a42006-04-10 22:54:58 -0700531 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700532 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -0800533 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700534
Miklos Szeredi71421252006-06-25 05:48:52 -0700535 if (sb->s_flags & MS_MANDLOCK)
536 return -EINVAL;
537
Miklos Szeredid8091612006-12-06 20:35:48 -0800538 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700539 return -EINVAL;
540
Miklos Szeredid8091612006-12-06 20:35:48 -0800541 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800542#ifdef CONFIG_BLOCK
Miklos Szeredid8091612006-12-06 20:35:48 -0800543 if (!sb_set_blocksize(sb, d.blksize))
544 return -EINVAL;
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800545#endif
Miklos Szeredid8091612006-12-06 20:35:48 -0800546 } else {
547 sb->s_blocksize = PAGE_CACHE_SIZE;
548 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
549 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700550 sb->s_magic = FUSE_SUPER_MAGIC;
551 sb->s_op = &fuse_super_operations;
552 sb->s_maxbytes = MAX_LFS_FILESIZE;
553
554 file = fget(d.fd);
555 if (!file)
556 return -EINVAL;
557
Miklos Szeredi0720b312006-04-10 22:54:55 -0700558 if (file->f_op != &fuse_dev_operations)
559 return -EINVAL;
560
Miklos Szeredi0720b312006-04-10 22:54:55 -0700561 fc = new_conn();
562 if (!fc)
563 return -ENOMEM;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700564
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700565 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700566 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700567 fc->group_id = d.group_id;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700568 fc->max_read = d.max_read;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700569
Miklos Szeredif543f252006-01-16 22:14:35 -0800570 /* Used by get_root_inode() */
571 sb->s_fs_info = fc;
572
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700573 err = -ENOMEM;
574 root = get_root_inode(sb, d.rootmode);
Miklos Szeredif543f252006-01-16 22:14:35 -0800575 if (!root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700576 goto err;
577
Miklos Szeredif543f252006-01-16 22:14:35 -0800578 root_dentry = d_alloc_root(root);
579 if (!root_dentry) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700580 iput(root);
581 goto err;
582 }
Miklos Szeredif543f252006-01-16 22:14:35 -0800583
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700584 init_req = fuse_request_alloc();
585 if (!init_req)
586 goto err_put_root;
587
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800588 if (is_bdev) {
589 fc->destroy_req = fuse_request_alloc();
590 if (!fc->destroy_req)
591 goto err_put_root;
592 }
593
Miklos Szeredibafa9652006-06-25 05:48:51 -0700594 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +0200595 err = -EINVAL;
596 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -0700597 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +0200598
Miklos Szeredibafa9652006-06-25 05:48:51 -0700599 fc->id = conn_id();
600 err = fuse_ctl_add_conn(fc);
601 if (err)
602 goto err_unlock;
603
604 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -0800605 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -0800606 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -0700607 file->private_data = fuse_conn_get(fc);
608 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -0700609 /*
610 * atomic_dec_and_test() in fput() provides the necessary
611 * memory barrier for file->private_data to be visible on all
612 * CPUs after this
613 */
614 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -0800615
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700616 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -0800617
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700618 return 0;
619
Miklos Szeredibafa9652006-06-25 05:48:51 -0700620 err_unlock:
621 mutex_unlock(&fuse_mutex);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700622 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -0800623 err_put_root:
624 dput(root_dentry);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700625 err:
Miklos Szeredi0720b312006-04-10 22:54:55 -0700626 fput(file);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700627 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700628 return err;
629}
630
David Howells454e2392006-06-23 02:02:57 -0700631static int fuse_get_sb(struct file_system_type *fs_type,
632 int flags, const char *dev_name,
633 void *raw_data, struct vfsmount *mnt)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700634{
David Howells454e2392006-06-23 02:02:57 -0700635 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700636}
637
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800638static struct file_system_type fuse_fs_type = {
639 .owner = THIS_MODULE,
640 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -0700641 .fs_flags = FS_HAS_SUBTYPE,
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800642 .get_sb = fuse_get_sb,
643 .kill_sb = kill_anon_super,
644};
645
646#ifdef CONFIG_BLOCK
Miklos Szeredid6392f82006-12-06 20:35:44 -0800647static int fuse_get_sb_blk(struct file_system_type *fs_type,
648 int flags, const char *dev_name,
649 void *raw_data, struct vfsmount *mnt)
650{
651 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
652 mnt);
653}
654
Miklos Szeredid6392f82006-12-06 20:35:44 -0800655static struct file_system_type fuseblk_fs_type = {
656 .owner = THIS_MODULE,
657 .name = "fuseblk",
658 .get_sb = fuse_get_sb_blk,
659 .kill_sb = kill_block_super,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -0700660 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -0800661};
662
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800663static inline int register_fuseblk(void)
664{
665 return register_filesystem(&fuseblk_fs_type);
666}
667
668static inline void unregister_fuseblk(void)
669{
670 unregister_filesystem(&fuseblk_fs_type);
671}
672#else
673static inline int register_fuseblk(void)
674{
675 return 0;
676}
677
678static inline void unregister_fuseblk(void)
679{
680}
681#endif
682
Miklos Szeredif543f252006-01-16 22:14:35 -0800683static decl_subsys(fuse, NULL, NULL);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700684static decl_subsys(connections, NULL, NULL);
Miklos Szeredif543f252006-01-16 22:14:35 -0800685
Christoph Lametere18b8902006-12-06 20:33:20 -0800686static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700687 unsigned long flags)
688{
689 struct inode * inode = foo;
690
Christoph Lametera35afb82007-05-16 22:10:57 -0700691 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700692}
693
694static int __init fuse_fs_init(void)
695{
696 int err;
697
698 err = register_filesystem(&fuse_fs_type);
699 if (err)
Miklos Szeredid6392f82006-12-06 20:35:44 -0800700 goto out;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700701
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800702 err = register_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -0800703 if (err)
704 goto out_unreg;
705
706 fuse_inode_cachep = kmem_cache_create("fuse_inode",
707 sizeof(struct fuse_inode),
708 0, SLAB_HWCACHE_ALIGN,
709 fuse_inode_init_once, NULL);
710 err = -ENOMEM;
711 if (!fuse_inode_cachep)
712 goto out_unreg2;
713
714 return 0;
715
716 out_unreg2:
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800717 unregister_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -0800718 out_unreg:
719 unregister_filesystem(&fuse_fs_type);
720 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700721 return err;
722}
723
724static void fuse_fs_cleanup(void)
725{
726 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800727 unregister_fuseblk();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700728 kmem_cache_destroy(fuse_inode_cachep);
729}
730
Miklos Szeredif543f252006-01-16 22:14:35 -0800731static int fuse_sysfs_init(void)
732{
733 int err;
734
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700735 kobj_set_kset_s(&fuse_subsys, fs_subsys);
Miklos Szeredif543f252006-01-16 22:14:35 -0800736 err = subsystem_register(&fuse_subsys);
737 if (err)
738 goto out_err;
739
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700740 kobj_set_kset_s(&connections_subsys, fuse_subsys);
Miklos Szeredif543f252006-01-16 22:14:35 -0800741 err = subsystem_register(&connections_subsys);
742 if (err)
743 goto out_fuse_unregister;
744
745 return 0;
746
747 out_fuse_unregister:
748 subsystem_unregister(&fuse_subsys);
749 out_err:
750 return err;
751}
752
753static void fuse_sysfs_cleanup(void)
754{
755 subsystem_unregister(&connections_subsys);
756 subsystem_unregister(&fuse_subsys);
757}
758
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700759static int __init fuse_init(void)
760{
761 int res;
762
763 printk("fuse init (API version %i.%i)\n",
764 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
765
Miklos Szeredibafa9652006-06-25 05:48:51 -0700766 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700767 res = fuse_fs_init();
768 if (res)
769 goto err;
770
Miklos Szeredi334f4852005-09-09 13:10:27 -0700771 res = fuse_dev_init();
772 if (res)
773 goto err_fs_cleanup;
774
Miklos Szeredif543f252006-01-16 22:14:35 -0800775 res = fuse_sysfs_init();
776 if (res)
777 goto err_dev_cleanup;
778
Miklos Szeredibafa9652006-06-25 05:48:51 -0700779 res = fuse_ctl_init();
780 if (res)
781 goto err_sysfs_cleanup;
782
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700783 return 0;
784
Miklos Szeredibafa9652006-06-25 05:48:51 -0700785 err_sysfs_cleanup:
786 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -0800787 err_dev_cleanup:
788 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -0700789 err_fs_cleanup:
790 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700791 err:
792 return res;
793}
794
795static void __exit fuse_exit(void)
796{
797 printk(KERN_DEBUG "fuse exit\n");
798
Miklos Szeredibafa9652006-06-25 05:48:51 -0700799 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -0800800 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700801 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -0700802 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700803}
804
805module_init(fuse_init);
806module_exit(fuse_exit);