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Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001/*
2 FUSE: Filesystem in Userspace
Miklos Szeredi1729a162008-11-26 12:03:54 +01003 Copyright (C) 2001-2008 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>
Csaba Henk487ea5a2009-08-26 19:17:22 +020017#include <linux/moduleparam.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070018#include <linux/parser.h>
19#include <linux/statfs.h>
Miklos Szeredi9c8ef562006-06-25 05:48:55 -070020#include <linux/random.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040021#include <linux/sched.h>
Miklos Szeredidbd561d2008-07-25 01:49:00 -070022#include <linux/exportfs.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070023
24MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
25MODULE_DESCRIPTION("Filesystem in Userspace");
26MODULE_LICENSE("GPL");
27
Christoph Lametere18b8902006-12-06 20:33:20 -080028static struct kmem_cache *fuse_inode_cachep;
Miklos Szeredibafa9652006-06-25 05:48:51 -070029struct list_head fuse_conn_list;
30DEFINE_MUTEX(fuse_mutex);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070031
Csaba Henk487ea5a2009-08-26 19:17:22 +020032static int set_global_limit(const char *val, struct kernel_param *kp);
33
Csaba Henk79a9d992009-08-26 19:18:24 +020034unsigned max_user_bgreq;
Csaba Henk487ea5a2009-08-26 19:17:22 +020035module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
36 &max_user_bgreq, 0644);
37__MODULE_PARM_TYPE(max_user_bgreq, "uint");
38MODULE_PARM_DESC(max_user_bgreq,
39 "Global limit for the maximum number of backgrounded requests an "
40 "unprivileged user can set");
41
Csaba Henk79a9d992009-08-26 19:18:24 +020042unsigned max_user_congthresh;
Csaba Henk487ea5a2009-08-26 19:17:22 +020043module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
44 &max_user_congthresh, 0644);
45__MODULE_PARM_TYPE(max_user_congthresh, "uint");
46MODULE_PARM_DESC(max_user_congthresh,
47 "Global limit for the maximum congestion threshold an "
48 "unprivileged user can set");
49
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070050#define FUSE_SUPER_MAGIC 0x65735546
51
Miklos Szeredid1875db2008-02-08 04:21:43 -080052#define FUSE_DEFAULT_BLKSIZE 512
53
Csaba Henk7a6d3c82009-07-01 17:28:41 -070054/** Maximum number of outstanding background requests */
55#define FUSE_DEFAULT_MAX_BACKGROUND 12
56
57/** Congestion starts at 75% of maximum */
58#define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)
59
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070060struct fuse_mount_data {
61 int fd;
62 unsigned rootmode;
63 unsigned user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -070064 unsigned group_id;
Miklos Szeredi1729a162008-11-26 12:03:54 +010065 unsigned fd_present:1;
66 unsigned rootmode_present:1;
67 unsigned user_id_present:1;
68 unsigned group_id_present:1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -070069 unsigned flags;
Miklos Szeredidb50b962005-09-09 13:10:33 -070070 unsigned max_read;
Miklos Szeredid8091612006-12-06 20:35:48 -080071 unsigned blksize;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070072};
73
Randy Dunlapa2daff62011-05-31 14:09:00 -070074struct fuse_forget_link *fuse_alloc_forget(void)
Miklos Szeredi07e77dc2010-12-07 20:16:56 +010075{
76 return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
77}
78
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070079static struct inode *fuse_alloc_inode(struct super_block *sb)
80{
81 struct inode *inode;
82 struct fuse_inode *fi;
83
Christoph Lametere94b1762006-12-06 20:33:17 -080084 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070085 if (!inode)
86 return NULL;
87
88 fi = get_fuse_inode(inode);
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070089 fi->i_time = 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070090 fi->nodeid = 0;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070091 fi->nlookup = 0;
John Muirfbee36b2007-11-28 16:22:02 -080092 fi->attr_version = 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -070093 fi->writectr = 0;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +040094 fi->orig_ino = 0;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070095 INIT_LIST_HEAD(&fi->write_files);
Miklos Szeredi3be5a522008-04-30 00:54:41 -070096 INIT_LIST_HEAD(&fi->queued_writes);
97 INIT_LIST_HEAD(&fi->writepages);
98 init_waitqueue_head(&fi->page_waitq);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +010099 fi->forget = fuse_alloc_forget();
100 if (!fi->forget) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700101 kmem_cache_free(fuse_inode_cachep, inode);
102 return NULL;
103 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700104
105 return inode;
106}
107
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100108static void fuse_i_callback(struct rcu_head *head)
109{
110 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100111 kmem_cache_free(fuse_inode_cachep, inode);
112}
113
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700114static void fuse_destroy_inode(struct inode *inode)
115{
Miklos Szeredie5e55582005-09-09 13:10:28 -0700116 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700117 BUG_ON(!list_empty(&fi->write_files));
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700118 BUG_ON(!list_empty(&fi->queued_writes));
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100119 kfree(fi->forget);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100120 call_rcu(&inode->i_rcu, fuse_i_callback);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700121}
122
Al Virob57922d2010-06-07 14:34:48 -0400123static void fuse_evict_inode(struct inode *inode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700124{
Al Virob57922d2010-06-07 14:34:48 -0400125 truncate_inode_pages(&inode->i_data, 0);
Jan Karadbd57682012-05-03 14:48:02 +0200126 clear_inode(inode);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700127 if (inode->i_sb->s_flags & MS_ACTIVE) {
128 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700129 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100130 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
131 fi->forget = NULL;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700132 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700133}
134
Miklos Szeredi71421252006-06-25 05:48:52 -0700135static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
136{
137 if (*flags & MS_MANDLOCK)
138 return -EINVAL;
139
140 return 0;
141}
142
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400143/*
144 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
145 * so that it will fit.
146 */
147static ino_t fuse_squash_ino(u64 ino64)
148{
149 ino_t ino = (ino_t) ino64;
150 if (sizeof(ino_t) < sizeof(u64))
151 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8;
152 return ino;
153}
154
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700155void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
156 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700157{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700158 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700159 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700160
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700161 fi->attr_version = ++fc->attr_version;
162 fi->i_time = attr_valid;
163
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400164 inode->i_ino = fuse_squash_ino(attr->ino);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700165 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200166 set_nlink(inode, attr->nlink);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700167 inode->i_uid = attr->uid;
168 inode->i_gid = attr->gid;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700169 inode->i_blocks = attr->blocks;
170 inode->i_atime.tv_sec = attr->atime;
171 inode->i_atime.tv_nsec = attr->atimensec;
172 inode->i_mtime.tv_sec = attr->mtime;
173 inode->i_mtime.tv_nsec = attr->mtimensec;
174 inode->i_ctime.tv_sec = attr->ctime;
175 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700176
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700177 if (attr->blksize != 0)
178 inode->i_blkbits = ilog2(attr->blksize);
179 else
180 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
181
Miklos Szerediebc14c42007-10-16 23:31:03 -0700182 /*
183 * Don't set the sticky bit in i_mode, unless we want the VFS
184 * to check permissions. This prevents failures due to the
185 * check in may_delete().
186 */
187 fi->orig_i_mode = inode->i_mode;
188 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
189 inode->i_mode &= ~S_ISVTX;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400190
191 fi->orig_ino = attr->ino;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700192}
193
194void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
195 u64 attr_valid, u64 attr_version)
196{
197 struct fuse_conn *fc = get_fuse_conn(inode);
198 struct fuse_inode *fi = get_fuse_inode(inode);
199 loff_t oldsize;
Brian Fostereed21792012-07-16 15:23:49 -0400200 struct timespec old_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700201
202 spin_lock(&fc->lock);
203 if (attr_version != 0 && fi->attr_version > attr_version) {
204 spin_unlock(&fc->lock);
205 return;
206 }
207
Brian Fostereed21792012-07-16 15:23:49 -0400208 old_mtime = inode->i_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700209 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700210
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700211 oldsize = inode->i_size;
212 i_size_write(inode, attr->size);
213 spin_unlock(&fc->lock);
214
Brian Fostereed21792012-07-16 15:23:49 -0400215 if (S_ISREG(inode->i_mode)) {
216 bool inval = false;
217
218 if (oldsize != attr->size) {
219 truncate_pagecache(inode, oldsize, attr->size);
220 inval = true;
221 } else if (fc->auto_inval_data) {
222 struct timespec new_mtime = {
223 .tv_sec = attr->mtime,
224 .tv_nsec = attr->mtimensec,
225 };
226
227 /*
228 * Auto inval mode also checks and invalidates if mtime
229 * has changed.
230 */
231 if (!timespec_equal(&old_mtime, &new_mtime))
232 inval = true;
233 }
234
235 if (inval)
236 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700237 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700238}
239
240static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
241{
242 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700243 inode->i_size = attr->size;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700244 if (S_ISREG(inode->i_mode)) {
245 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700246 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700247 } else if (S_ISDIR(inode->i_mode))
248 fuse_init_dir(inode);
249 else if (S_ISLNK(inode->i_mode))
250 fuse_init_symlink(inode);
251 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
252 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
253 fuse_init_common(inode);
254 init_special_inode(inode, inode->i_mode,
255 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800256 } else
257 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700258}
259
John Muir3b463ae2009-05-31 11:13:57 -0400260int fuse_inode_eq(struct inode *inode, void *_nodeidp)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700261{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700262 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700263 if (get_node_id(inode) == nodeid)
264 return 1;
265 else
266 return 0;
267}
268
269static int fuse_inode_set(struct inode *inode, void *_nodeidp)
270{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700271 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700272 get_fuse_inode(inode)->nodeid = nodeid;
273 return 0;
274}
275
Miklos Szeredib48badf2008-04-30 00:54:44 -0700276struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700277 int generation, struct fuse_attr *attr,
278 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700279{
280 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700281 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700282 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700283
284 retry:
285 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
286 if (!inode)
287 return NULL;
288
289 if ((inode->i_state & I_NEW)) {
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700290 inode->i_flags |= S_NOATIME|S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700291 inode->i_generation = generation;
292 inode->i_data.backing_dev_info = &fc->bdi;
293 fuse_init_inode(inode, attr);
294 unlock_new_inode(inode);
295 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700296 /* Inode has changed type, any I/O on the old should fail */
297 make_bad_inode(inode);
298 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700299 goto retry;
300 }
301
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700302 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700303 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100304 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700305 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700306 fuse_change_attributes(inode, attr, attr_valid, attr_version);
307
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700308 return inode;
309}
310
John Muir3b463ae2009-05-31 11:13:57 -0400311int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
312 loff_t offset, loff_t len)
313{
314 struct inode *inode;
315 pgoff_t pg_start;
316 pgoff_t pg_end;
317
318 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
319 if (!inode)
320 return -ENOENT;
321
322 fuse_invalidate_attr(inode);
323 if (offset >= 0) {
324 pg_start = offset >> PAGE_CACHE_SHIFT;
325 if (len <= 0)
326 pg_end = -1;
327 else
328 pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
329 invalidate_inode_pages2_range(inode->i_mapping,
330 pg_start, pg_end);
331 }
332 iput(inode);
333 return 0;
334}
335
Al Viro42faad92008-04-24 07:21:56 -0400336static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800337{
Al Viro42faad92008-04-24 07:21:56 -0400338 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800339}
340
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800341static void fuse_send_destroy(struct fuse_conn *fc)
342{
343 struct fuse_req *req = fc->destroy_req;
344 if (req && fc->conn_init) {
345 fc->destroy_req = NULL;
346 req->in.h.opcode = FUSE_DESTROY;
347 req->force = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100348 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800349 fuse_put_request(fc, req);
350 }
351}
352
Tejun Heoa325f9b2009-04-14 10:54:52 +0900353static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700354{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900355 if (fc->bdi_initialized)
356 bdi_destroy(&fc->bdi);
357}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700358
Tejun Heo08cbf542009-04-14 10:54:53 +0900359void fuse_conn_kill(struct fuse_conn *fc)
Tejun Heoa325f9b2009-04-14 10:54:52 +0900360{
Miklos Szeredid7133112006-04-10 22:54:55 -0700361 spin_lock(&fc->lock);
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800362 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700363 fc->blocked = 0;
Miklos Szeredid7133112006-04-10 22:54:55 -0700364 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700365 /* Flush all readers on this fs */
Jeff Dike385a17b2006-04-10 22:54:52 -0700366 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700367 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700368 wake_up_all(&fc->blocked_waitq);
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700369 wake_up_all(&fc->reserved_req_waitq);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900370}
Tejun Heo08cbf542009-04-14 10:54:53 +0900371EXPORT_SYMBOL_GPL(fuse_conn_kill);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900372
373static void fuse_put_super(struct super_block *sb)
374{
375 struct fuse_conn *fc = get_fuse_conn_super(sb);
376
377 fuse_send_destroy(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200378
Tejun Heoa325f9b2009-04-14 10:54:52 +0900379 fuse_conn_kill(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200380 mutex_lock(&fuse_mutex);
381 list_del(&fc->entry);
382 fuse_ctl_remove_conn(fc);
383 mutex_unlock(&fuse_mutex);
384 fuse_bdi_destroy(fc);
385
Miklos Szeredibafa9652006-06-25 05:48:51 -0700386 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700387}
388
Miklos Szeredie5e55582005-09-09 13:10:28 -0700389static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
390{
391 stbuf->f_type = FUSE_SUPER_MAGIC;
392 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800393 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700394 stbuf->f_blocks = attr->blocks;
395 stbuf->f_bfree = attr->bfree;
396 stbuf->f_bavail = attr->bavail;
397 stbuf->f_files = attr->files;
398 stbuf->f_ffree = attr->ffree;
399 stbuf->f_namelen = attr->namelen;
400 /* fsid is left zero */
401}
402
David Howells726c3342006-06-23 02:02:58 -0700403static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700404{
David Howells726c3342006-06-23 02:02:58 -0700405 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700406 struct fuse_conn *fc = get_fuse_conn_super(sb);
407 struct fuse_req *req;
408 struct fuse_statfs_out outarg;
409 int err;
410
Miklos Szeredie57ac682007-10-18 03:06:58 -0700411 if (!fuse_allow_task(fc, current)) {
412 buf->f_type = FUSE_SUPER_MAGIC;
413 return 0;
414 }
415
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700416 req = fuse_get_req(fc);
417 if (IS_ERR(req))
418 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700419
Miklos Szeredide5f1202006-01-06 00:19:37 -0800420 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700421 req->in.numargs = 0;
422 req->in.h.opcode = FUSE_STATFS;
Miklos Szeredi5b35e8e2006-09-29 01:59:34 -0700423 req->in.h.nodeid = get_node_id(dentry->d_inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700424 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800425 req->out.args[0].size =
426 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700427 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100428 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700429 err = req->out.h.error;
430 if (!err)
431 convert_fuse_statfs(buf, &outarg.st);
432 fuse_put_request(fc, req);
433 return err;
434}
435
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700436enum {
437 OPT_FD,
438 OPT_ROOTMODE,
439 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700440 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700441 OPT_DEFAULT_PERMISSIONS,
442 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700443 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800444 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700445 OPT_ERR
446};
447
Steven Whitehousea447c092008-10-13 10:46:57 +0100448static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700449 {OPT_FD, "fd=%u"},
450 {OPT_ROOTMODE, "rootmode=%o"},
451 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700452 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700453 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
454 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700455 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800456 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700457 {OPT_ERR, NULL}
458};
459
Miklos Szeredid8091612006-12-06 20:35:48 -0800460static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700461{
462 char *p;
463 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700464 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800465 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700466
467 while ((p = strsep(&opt, ",")) != NULL) {
468 int token;
469 int value;
470 substring_t args[MAX_OPT_ARGS];
471 if (!*p)
472 continue;
473
474 token = match_token(p, tokens, args);
475 switch (token) {
476 case OPT_FD:
477 if (match_int(&args[0], &value))
478 return 0;
479 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700480 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700481 break;
482
483 case OPT_ROOTMODE:
484 if (match_octal(&args[0], &value))
485 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700486 if (!fuse_valid_type(value))
487 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700488 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700489 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700490 break;
491
492 case OPT_USER_ID:
493 if (match_int(&args[0], &value))
494 return 0;
495 d->user_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700496 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700497 break;
498
Miklos Szeredi87729a52005-09-09 13:10:34 -0700499 case OPT_GROUP_ID:
500 if (match_int(&args[0], &value))
501 return 0;
502 d->group_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700503 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700504 break;
505
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700506 case OPT_DEFAULT_PERMISSIONS:
507 d->flags |= FUSE_DEFAULT_PERMISSIONS;
508 break;
509
510 case OPT_ALLOW_OTHER:
511 d->flags |= FUSE_ALLOW_OTHER;
512 break;
513
Miklos Szeredidb50b962005-09-09 13:10:33 -0700514 case OPT_MAX_READ:
515 if (match_int(&args[0], &value))
516 return 0;
517 d->max_read = value;
518 break;
519
Miklos Szeredid8091612006-12-06 20:35:48 -0800520 case OPT_BLKSIZE:
521 if (!is_bdev || match_int(&args[0], &value))
522 return 0;
523 d->blksize = value;
524 break;
525
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700526 default:
527 return 0;
528 }
529 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700530
531 if (!d->fd_present || !d->rootmode_present ||
532 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700533 return 0;
534
535 return 1;
536}
537
Al Viro34c80b12011-12-08 21:32:45 -0500538static int fuse_show_options(struct seq_file *m, struct dentry *root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700539{
Al Viro34c80b12011-12-08 21:32:45 -0500540 struct super_block *sb = root->d_sb;
541 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700542
543 seq_printf(m, ",user_id=%u", fc->user_id);
Miklos Szeredi87729a52005-09-09 13:10:34 -0700544 seq_printf(m, ",group_id=%u", fc->group_id);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700545 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
546 seq_puts(m, ",default_permissions");
547 if (fc->flags & FUSE_ALLOW_OTHER)
548 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700549 if (fc->max_read != ~0)
550 seq_printf(m, ",max_read=%u", fc->max_read);
Al Viro34c80b12011-12-08 21:32:45 -0500551 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
552 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700553 return 0;
554}
555
Tejun Heoa325f9b2009-04-14 10:54:52 +0900556void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700557{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100558 memset(fc, 0, sizeof(*fc));
559 spin_lock_init(&fc->lock);
560 mutex_init(&fc->inst_mutex);
John Muir3b463ae2009-05-31 11:13:57 -0400561 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100562 atomic_set(&fc->count, 1);
563 init_waitqueue_head(&fc->waitq);
564 init_waitqueue_head(&fc->blocked_waitq);
565 init_waitqueue_head(&fc->reserved_req_waitq);
566 INIT_LIST_HEAD(&fc->pending);
567 INIT_LIST_HEAD(&fc->processing);
568 INIT_LIST_HEAD(&fc->io);
569 INIT_LIST_HEAD(&fc->interrupts);
570 INIT_LIST_HEAD(&fc->bg_queue);
571 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100572 fc->forget_list_tail = &fc->forget_list_head;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100573 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700574 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
575 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100576 fc->khctr = 0;
577 fc->polled_files = RB_ROOT;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100578 fc->reqctr = 0;
579 fc->blocked = 1;
580 fc->attr_version = 1;
581 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700582}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100583EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700584
Miklos Szeredibafa9652006-06-25 05:48:51 -0700585void fuse_conn_put(struct fuse_conn *fc)
586{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700587 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800588 if (fc->destroy_req)
589 fuse_request_free(fc->destroy_req);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700590 mutex_destroy(&fc->inst_mutex);
Tejun Heo43901aa2008-11-26 12:03:56 +0100591 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700592 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700593}
Tejun Heo08cbf542009-04-14 10:54:53 +0900594EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700595
596struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
597{
598 atomic_inc(&fc->count);
599 return fc;
600}
Tejun Heo08cbf542009-04-14 10:54:53 +0900601EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700602
Tejun Heob93f8582008-11-26 12:03:55 +0100603static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700604{
605 struct fuse_attr attr;
606 memset(&attr, 0, sizeof(attr));
607
608 attr.mode = mode;
609 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700610 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700611 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700612}
613
Miklos Szeredi1729a162008-11-26 12:03:54 +0100614struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700615 u64 nodeid;
616 u32 generation;
617};
618
619static struct dentry *fuse_get_dentry(struct super_block *sb,
620 struct fuse_inode_handle *handle)
621{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700622 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700623 struct inode *inode;
624 struct dentry *entry;
625 int err = -ESTALE;
626
627 if (handle->nodeid == 0)
628 goto out_err;
629
630 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700631 if (!inode) {
632 struct fuse_entry_out outarg;
633 struct qstr name;
634
635 if (!fc->export_support)
636 goto out_err;
637
638 name.len = 1;
639 name.name = ".";
640 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
641 &inode);
642 if (err && err != -ENOENT)
643 goto out_err;
644 if (err || !inode) {
645 err = -ESTALE;
646 goto out_err;
647 }
648 err = -EIO;
649 if (get_node_id(inode) != handle->nodeid)
650 goto out_iput;
651 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700652 err = -ESTALE;
653 if (inode->i_generation != handle->generation)
654 goto out_iput;
655
Christoph Hellwig44003722008-08-11 15:49:04 +0200656 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500657 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700658 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700659
660 return entry;
661
662 out_iput:
663 iput(inode);
664 out_err:
665 return ERR_PTR(err);
666}
667
Al Virob0b03822012-04-02 14:34:06 -0400668static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
669 struct inode *parent)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700670{
Al Virob0b03822012-04-02 14:34:06 -0400671 int len = parent ? 6 : 3;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700672 u64 nodeid;
673 u32 generation;
674
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530675 if (*max_len < len) {
676 *max_len = len;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700677 return 255;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530678 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700679
680 nodeid = get_fuse_inode(inode)->nodeid;
681 generation = inode->i_generation;
682
683 fh[0] = (u32)(nodeid >> 32);
684 fh[1] = (u32)(nodeid & 0xffffffff);
685 fh[2] = generation;
686
Al Virob0b03822012-04-02 14:34:06 -0400687 if (parent) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700688 nodeid = get_fuse_inode(parent)->nodeid;
689 generation = parent->i_generation;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700690
691 fh[3] = (u32)(nodeid >> 32);
692 fh[4] = (u32)(nodeid & 0xffffffff);
693 fh[5] = generation;
694 }
695
696 *max_len = len;
Al Virob0b03822012-04-02 14:34:06 -0400697 return parent ? 0x82 : 0x81;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700698}
699
700static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
701 struct fid *fid, int fh_len, int fh_type)
702{
703 struct fuse_inode_handle handle;
704
705 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
706 return NULL;
707
708 handle.nodeid = (u64) fid->raw[0] << 32;
709 handle.nodeid |= (u64) fid->raw[1];
710 handle.generation = fid->raw[2];
711 return fuse_get_dentry(sb, &handle);
712}
713
714static struct dentry *fuse_fh_to_parent(struct super_block *sb,
715 struct fid *fid, int fh_len, int fh_type)
716{
717 struct fuse_inode_handle parent;
718
719 if (fh_type != 0x82 || fh_len < 6)
720 return NULL;
721
722 parent.nodeid = (u64) fid->raw[3] << 32;
723 parent.nodeid |= (u64) fid->raw[4];
724 parent.generation = fid->raw[5];
725 return fuse_get_dentry(sb, &parent);
726}
727
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700728static struct dentry *fuse_get_parent(struct dentry *child)
729{
730 struct inode *child_inode = child->d_inode;
731 struct fuse_conn *fc = get_fuse_conn(child_inode);
732 struct inode *inode;
733 struct dentry *parent;
734 struct fuse_entry_out outarg;
735 struct qstr name;
736 int err;
737
738 if (!fc->export_support)
739 return ERR_PTR(-ESTALE);
740
741 name.len = 2;
742 name.name = "..";
743 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
744 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200745 if (err) {
746 if (err == -ENOENT)
747 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700748 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700749 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200750
751 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500752 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700753 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700754
755 return parent;
756}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700757
758static const struct export_operations fuse_export_operations = {
759 .fh_to_dentry = fuse_fh_to_dentry,
760 .fh_to_parent = fuse_fh_to_parent,
761 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700762 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700763};
764
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800765static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700766 .alloc_inode = fuse_alloc_inode,
767 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400768 .evict_inode = fuse_evict_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700769 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700770 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700771 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800772 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700773 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700774 .show_options = fuse_show_options,
775};
776
Csaba Henk487ea5a2009-08-26 19:17:22 +0200777static void sanitize_global_limit(unsigned *limit)
778{
779 if (*limit == 0)
780 *limit = ((num_physpages << PAGE_SHIFT) >> 13) /
781 sizeof(struct fuse_req);
782
783 if (*limit >= 1 << 16)
784 *limit = (1 << 16) - 1;
785}
786
787static int set_global_limit(const char *val, struct kernel_param *kp)
788{
789 int rv;
790
791 rv = param_set_uint(val, kp);
792 if (rv)
793 return rv;
794
795 sanitize_global_limit((unsigned *)kp->arg);
796
797 return 0;
798}
799
800static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
801{
802 int cap_sys_admin = capable(CAP_SYS_ADMIN);
803
804 if (arg->minor < 13)
805 return;
806
807 sanitize_global_limit(&max_user_bgreq);
808 sanitize_global_limit(&max_user_congthresh);
809
810 if (arg->max_background) {
811 fc->max_background = arg->max_background;
812
813 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
814 fc->max_background = max_user_bgreq;
815 }
816 if (arg->congestion_threshold) {
817 fc->congestion_threshold = arg->congestion_threshold;
818
819 if (!cap_sys_admin &&
820 fc->congestion_threshold > max_user_congthresh)
821 fc->congestion_threshold = max_user_congthresh;
822 }
823}
824
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800825static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
826{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800827 struct fuse_init_out *arg = &req->misc.init_out;
828
829 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
830 fc->conn_error = 1;
831 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800832 unsigned long ra_pages;
833
Csaba Henk487ea5a2009-08-26 19:17:22 +0200834 process_init_limits(fc, arg);
835
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800836 if (arg->minor >= 6) {
837 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
838 if (arg->flags & FUSE_ASYNC_READ)
839 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700840 if (!(arg->flags & FUSE_POSIX_LOCKS))
841 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200842 if (arg->minor >= 17) {
843 if (!(arg->flags & FUSE_FLOCK_LOCKS))
844 fc->no_flock = 1;
Miklos Szeredi24114502011-09-12 09:31:49 +0200845 } else {
846 if (!(arg->flags & FUSE_POSIX_LOCKS))
847 fc->no_flock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200848 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700849 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
850 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700851 if (arg->minor >= 9) {
852 /* LOOKUP has dependency on proto version */
853 if (arg->flags & FUSE_EXPORT_SUPPORT)
854 fc->export_support = 1;
855 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700856 if (arg->flags & FUSE_BIG_WRITES)
857 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200858 if (arg->flags & FUSE_DONT_MASK)
859 fc->dont_mask = 1;
Brian Foster72d0d242012-07-16 15:23:48 -0400860 if (arg->flags & FUSE_AUTO_INVAL_DATA)
861 fc->auto_inval_data = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700862 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800863 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700864 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200865 fc->no_flock = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700866 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800867
868 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800869 fc->minor = arg->minor;
870 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200871 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800872 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800873 }
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700874 fc->blocked = 0;
875 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800876}
877
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700878static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800879{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800880 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800881
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800882 arg->major = FUSE_KERNEL_VERSION;
883 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800884 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700885 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200886 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
Miklos Szeredi69fe05c2012-07-18 16:09:40 +0200887 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
888 FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800889 req->in.h.opcode = FUSE_INIT;
890 req->in.numargs = 1;
891 req->in.args[0].size = sizeof(*arg);
892 req->in.args[0].value = arg;
893 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800894 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800895 with interface version < 7.5. Rest of init_out is zeroed
896 by do_get_request(), so a short reply is not a problem */
897 req->out.argvar = 1;
898 req->out.args[0].size = sizeof(struct fuse_init_out);
899 req->out.args[0].value = &req->misc.init_out;
900 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100901 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800902}
903
Tejun Heo43901aa2008-11-26 12:03:56 +0100904static void fuse_free_conn(struct fuse_conn *fc)
905{
906 kfree(fc);
907}
908
Tejun Heoa325f9b2009-04-14 10:54:52 +0900909static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
910{
911 int err;
912
Jens Axboed9938312009-06-12 14:45:52 +0200913 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900914 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900915 /* fuse does it's own writeback accounting */
916 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
917
918 err = bdi_init(&fc->bdi);
919 if (err)
920 return err;
921
922 fc->bdi_initialized = 1;
923
924 if (sb->s_bdev) {
925 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
926 MAJOR(fc->dev), MINOR(fc->dev));
927 } else {
928 err = bdi_register_dev(&fc->bdi, fc->dev);
929 }
930
931 if (err)
932 return err;
933
934 /*
935 * For a single fuse filesystem use max 1% of dirty +
936 * writeback threshold.
937 *
938 * This gives about 1M of write buffer for memory maps on a
939 * machine with 1G and 10% dirty_ratio, which should be more
940 * than enough.
941 *
942 * Privileged users can raise it by writing to
943 *
944 * /sys/class/bdi/<bdi>/max_ratio
945 */
946 bdi_set_max_ratio(&fc->bdi, 1);
947
948 return 0;
949}
950
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700951static int fuse_fill_super(struct super_block *sb, void *data, int silent)
952{
953 struct fuse_conn *fc;
954 struct inode *root;
955 struct fuse_mount_data d;
956 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800957 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700958 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700959 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -0800960 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700961
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100962 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -0700963 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100964 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -0700965
Al Viro9e1f1de2011-06-03 18:24:58 -0400966 sb->s_flags &= ~MS_NOSEC;
967
Miklos Szeredid8091612006-12-06 20:35:48 -0800968 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100969 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700970
Miklos Szeredid8091612006-12-06 20:35:48 -0800971 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800972#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100973 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -0800974 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100975 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800976#endif
Miklos Szeredid8091612006-12-06 20:35:48 -0800977 } else {
978 sb->s_blocksize = PAGE_CACHE_SIZE;
979 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
980 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700981 sb->s_magic = FUSE_SUPER_MAGIC;
982 sb->s_op = &fuse_super_operations;
983 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredi0a2da9b2012-04-11 11:45:06 +0200984 sb->s_time_gran = 1;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700985 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700986
987 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100988 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700989 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100990 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700991
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100992 if (file->f_op != &fuse_dev_operations)
993 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -0700994
Tejun Heo0d179aa2008-11-26 12:03:55 +0100995 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100996 err = -ENOMEM;
997 if (!fc)
998 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700999
Tejun Heoa325f9b2009-04-14 10:54:52 +09001000 fuse_conn_init(fc);
1001
1002 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -04001003 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001004 err = fuse_bdi_init(fc, sb);
1005 if (err)
1006 goto err_put_conn;
Tejun Heo0d179aa2008-11-26 12:03:55 +01001007
Jens Axboe32a88aa2009-09-16 15:02:33 +02001008 sb->s_bdi = &fc->bdi;
1009
Miklos Szeredie0a43dd2009-06-30 20:12:23 +02001010 /* Handle umasking inside the fuse code */
1011 if (sb->s_flags & MS_POSIXACL)
1012 fc->dont_mask = 1;
1013 sb->s_flags |= MS_POSIXACL;
1014
Tejun Heo43901aa2008-11-26 12:03:56 +01001015 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001016 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001017 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001018 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +02001019 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001020
Miklos Szeredif543f252006-01-16 22:14:35 -08001021 /* Used by get_root_inode() */
1022 sb->s_fs_info = fc;
1023
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001024 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +01001025 root = fuse_get_root_inode(sb, d.rootmode);
Al Viro48fde702012-01-08 22:15:13 -05001026 root_dentry = d_make_root(root);
1027 if (!root_dentry)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001028 goto err_put_conn;
Al Viroc35eebe2010-12-18 11:15:22 -05001029 /* only now - we want root dentry with NULL ->d_op */
1030 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -08001031
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001032 init_req = fuse_request_alloc();
1033 if (!init_req)
1034 goto err_put_root;
1035
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001036 if (is_bdev) {
1037 fc->destroy_req = fuse_request_alloc();
1038 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001039 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001040 }
1041
Miklos Szeredibafa9652006-06-25 05:48:51 -07001042 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001043 err = -EINVAL;
1044 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001045 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001046
Miklos Szeredibafa9652006-06-25 05:48:51 -07001047 err = fuse_ctl_add_conn(fc);
1048 if (err)
1049 goto err_unlock;
1050
1051 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001052 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -08001053 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001054 file->private_data = fuse_conn_get(fc);
1055 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001056 /*
1057 * atomic_dec_and_test() in fput() provides the necessary
1058 * memory barrier for file->private_data to be visible on all
1059 * CPUs after this
1060 */
1061 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001062
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001063 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001064
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001065 return 0;
1066
Miklos Szeredibafa9652006-06-25 05:48:51 -07001067 err_unlock:
1068 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001069 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001070 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001071 err_put_root:
1072 dput(root_dentry);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001073 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001074 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001075 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001076 err_fput:
1077 fput(file);
1078 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001079 return err;
1080}
1081
Al Viro3c26ff62010-07-25 11:46:36 +04001082static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001083 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001084 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001085{
Al Viro3c26ff62010-07-25 11:46:36 +04001086 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001087}
1088
John Muir3b463ae2009-05-31 11:13:57 -04001089static void fuse_kill_sb_anon(struct super_block *sb)
1090{
1091 struct fuse_conn *fc = get_fuse_conn_super(sb);
1092
1093 if (fc) {
1094 down_write(&fc->killsb);
1095 fc->sb = NULL;
1096 up_write(&fc->killsb);
1097 }
1098
1099 kill_anon_super(sb);
1100}
1101
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001102static struct file_system_type fuse_fs_type = {
1103 .owner = THIS_MODULE,
1104 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001105 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001106 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001107 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001108};
1109
1110#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001111static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001112 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001113 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001114{
Al Viro152a0832010-07-25 00:46:55 +04001115 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001116}
1117
John Muir3b463ae2009-05-31 11:13:57 -04001118static void fuse_kill_sb_blk(struct super_block *sb)
1119{
1120 struct fuse_conn *fc = get_fuse_conn_super(sb);
1121
1122 if (fc) {
1123 down_write(&fc->killsb);
1124 fc->sb = NULL;
1125 up_write(&fc->killsb);
1126 }
1127
1128 kill_block_super(sb);
1129}
1130
Miklos Szeredid6392f82006-12-06 20:35:44 -08001131static struct file_system_type fuseblk_fs_type = {
1132 .owner = THIS_MODULE,
1133 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001134 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001135 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001136 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001137};
1138
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001139static inline int register_fuseblk(void)
1140{
1141 return register_filesystem(&fuseblk_fs_type);
1142}
1143
1144static inline void unregister_fuseblk(void)
1145{
1146 unregister_filesystem(&fuseblk_fs_type);
1147}
1148#else
1149static inline int register_fuseblk(void)
1150{
1151 return 0;
1152}
1153
1154static inline void unregister_fuseblk(void)
1155{
1156}
1157#endif
1158
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001159static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001160{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001161 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001162
Christoph Lametera35afb82007-05-16 22:10:57 -07001163 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001164}
1165
1166static int __init fuse_fs_init(void)
1167{
1168 int err;
1169
Miklos Szeredid6392f82006-12-06 20:35:44 -08001170 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1171 sizeof(struct fuse_inode),
1172 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001173 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001174 err = -ENOMEM;
1175 if (!fuse_inode_cachep)
Al Viro988f0322011-12-13 12:25:27 -05001176 goto out;
1177
1178 err = register_fuseblk();
1179 if (err)
1180 goto out2;
1181
1182 err = register_filesystem(&fuse_fs_type);
1183 if (err)
1184 goto out3;
Miklos Szeredid6392f82006-12-06 20:35:44 -08001185
1186 return 0;
1187
Al Viro988f0322011-12-13 12:25:27 -05001188 out3:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001189 unregister_fuseblk();
Al Viro988f0322011-12-13 12:25:27 -05001190 out2:
1191 kmem_cache_destroy(fuse_inode_cachep);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001192 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001193 return err;
1194}
1195
1196static void fuse_fs_cleanup(void)
1197{
1198 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001199 unregister_fuseblk();
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001200
1201 /*
1202 * Make sure all delayed rcu free inodes are flushed before we
1203 * destroy cache.
1204 */
1205 rcu_barrier();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001206 kmem_cache_destroy(fuse_inode_cachep);
1207}
1208
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001209static struct kobject *fuse_kobj;
1210static struct kobject *connections_kobj;
1211
Miklos Szeredif543f252006-01-16 22:14:35 -08001212static int fuse_sysfs_init(void)
1213{
1214 int err;
1215
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001216 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001217 if (!fuse_kobj) {
1218 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001219 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001220 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001221
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001222 connections_kobj = kobject_create_and_add("connections", fuse_kobj);
1223 if (!connections_kobj) {
1224 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001225 goto out_fuse_unregister;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001226 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001227
1228 return 0;
1229
1230 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001231 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001232 out_err:
1233 return err;
1234}
1235
1236static void fuse_sysfs_cleanup(void)
1237{
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001238 kobject_put(connections_kobj);
1239 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001240}
1241
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001242static int __init fuse_init(void)
1243{
1244 int res;
1245
Miklos Szeredi1729a162008-11-26 12:03:54 +01001246 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001247 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1248
Miklos Szeredibafa9652006-06-25 05:48:51 -07001249 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001250 res = fuse_fs_init();
1251 if (res)
1252 goto err;
1253
Miklos Szeredi334f4852005-09-09 13:10:27 -07001254 res = fuse_dev_init();
1255 if (res)
1256 goto err_fs_cleanup;
1257
Miklos Szeredif543f252006-01-16 22:14:35 -08001258 res = fuse_sysfs_init();
1259 if (res)
1260 goto err_dev_cleanup;
1261
Miklos Szeredibafa9652006-06-25 05:48:51 -07001262 res = fuse_ctl_init();
1263 if (res)
1264 goto err_sysfs_cleanup;
1265
Csaba Henk487ea5a2009-08-26 19:17:22 +02001266 sanitize_global_limit(&max_user_bgreq);
1267 sanitize_global_limit(&max_user_congthresh);
1268
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001269 return 0;
1270
Miklos Szeredibafa9652006-06-25 05:48:51 -07001271 err_sysfs_cleanup:
1272 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001273 err_dev_cleanup:
1274 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001275 err_fs_cleanup:
1276 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001277 err:
1278 return res;
1279}
1280
1281static void __exit fuse_exit(void)
1282{
1283 printk(KERN_DEBUG "fuse exit\n");
1284
Miklos Szeredibafa9652006-06-25 05:48:51 -07001285 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001286 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001287 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001288 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001289}
1290
1291module_init(fuse_init);
1292module_exit(fuse_exit);