blob: d468643a68b2f4b9b9cf7ca38de529db096f89ed [file] [log] [blame]
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;
Eric W. Biederman499dcf22012-02-07 16:26:03 -080063 kuid_t user_id;
64 kgid_t 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;
Feng Shuo4582a4a2013-01-15 11:23:28 +080095 fi->state = 0;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070096 INIT_LIST_HEAD(&fi->write_files);
Miklos Szeredi3be5a522008-04-30 00:54:41 -070097 INIT_LIST_HEAD(&fi->queued_writes);
98 INIT_LIST_HEAD(&fi->writepages);
99 init_waitqueue_head(&fi->page_waitq);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100100 fi->forget = fuse_alloc_forget();
101 if (!fi->forget) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700102 kmem_cache_free(fuse_inode_cachep, inode);
103 return NULL;
104 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700105
106 return inode;
107}
108
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100109static void fuse_i_callback(struct rcu_head *head)
110{
111 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100112 kmem_cache_free(fuse_inode_cachep, inode);
113}
114
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700115static void fuse_destroy_inode(struct inode *inode)
116{
Miklos Szeredie5e55582005-09-09 13:10:28 -0700117 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700118 BUG_ON(!list_empty(&fi->write_files));
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700119 BUG_ON(!list_empty(&fi->queued_writes));
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100120 kfree(fi->forget);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100121 call_rcu(&inode->i_rcu, fuse_i_callback);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700122}
123
Al Virob57922d2010-06-07 14:34:48 -0400124static void fuse_evict_inode(struct inode *inode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700125{
Al Virob57922d2010-06-07 14:34:48 -0400126 truncate_inode_pages(&inode->i_data, 0);
Jan Karadbd57682012-05-03 14:48:02 +0200127 clear_inode(inode);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700128 if (inode->i_sb->s_flags & MS_ACTIVE) {
129 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700130 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100131 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
132 fi->forget = NULL;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700133 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700134}
135
Miklos Szeredi71421252006-06-25 05:48:52 -0700136static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
137{
138 if (*flags & MS_MANDLOCK)
139 return -EINVAL;
140
141 return 0;
142}
143
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400144/*
145 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
146 * so that it will fit.
147 */
148static ino_t fuse_squash_ino(u64 ino64)
149{
150 ino_t ino = (ino_t) ino64;
151 if (sizeof(ino_t) < sizeof(u64))
152 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8;
153 return ino;
154}
155
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700156void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
157 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700158{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700159 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700160 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700161
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700162 fi->attr_version = ++fc->attr_version;
163 fi->i_time = attr_valid;
164
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400165 inode->i_ino = fuse_squash_ino(attr->ino);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700166 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200167 set_nlink(inode, attr->nlink);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800168 inode->i_uid = make_kuid(&init_user_ns, attr->uid);
169 inode->i_gid = make_kgid(&init_user_ns, attr->gid);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700170 inode->i_blocks = attr->blocks;
171 inode->i_atime.tv_sec = attr->atime;
172 inode->i_atime.tv_nsec = attr->atimensec;
173 inode->i_mtime.tv_sec = attr->mtime;
174 inode->i_mtime.tv_nsec = attr->mtimensec;
175 inode->i_ctime.tv_sec = attr->ctime;
176 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700177
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700178 if (attr->blksize != 0)
179 inode->i_blkbits = ilog2(attr->blksize);
180 else
181 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
182
Miklos Szerediebc14c42007-10-16 23:31:03 -0700183 /*
184 * Don't set the sticky bit in i_mode, unless we want the VFS
185 * to check permissions. This prevents failures due to the
186 * check in may_delete().
187 */
188 fi->orig_i_mode = inode->i_mode;
189 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
190 inode->i_mode &= ~S_ISVTX;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400191
192 fi->orig_ino = attr->ino;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700193}
194
195void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
196 u64 attr_valid, u64 attr_version)
197{
198 struct fuse_conn *fc = get_fuse_conn(inode);
199 struct fuse_inode *fi = get_fuse_inode(inode);
200 loff_t oldsize;
Brian Fostereed21792012-07-16 15:23:49 -0400201 struct timespec old_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700202
203 spin_lock(&fc->lock);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +0400204 if ((attr_version != 0 && fi->attr_version > attr_version) ||
205 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700206 spin_unlock(&fc->lock);
207 return;
208 }
209
Brian Fostereed21792012-07-16 15:23:49 -0400210 old_mtime = inode->i_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700211 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700212
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700213 oldsize = inode->i_size;
214 i_size_write(inode, attr->size);
215 spin_unlock(&fc->lock);
216
Brian Fostereed21792012-07-16 15:23:49 -0400217 if (S_ISREG(inode->i_mode)) {
218 bool inval = false;
219
220 if (oldsize != attr->size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700221 truncate_pagecache(inode, attr->size);
Brian Fostereed21792012-07-16 15:23:49 -0400222 inval = true;
223 } else if (fc->auto_inval_data) {
224 struct timespec new_mtime = {
225 .tv_sec = attr->mtime,
226 .tv_nsec = attr->mtimensec,
227 };
228
229 /*
230 * Auto inval mode also checks and invalidates if mtime
231 * has changed.
232 */
233 if (!timespec_equal(&old_mtime, &new_mtime))
234 inval = true;
235 }
236
237 if (inval)
238 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700239 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700240}
241
242static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
243{
244 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700245 inode->i_size = attr->size;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700246 if (S_ISREG(inode->i_mode)) {
247 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700248 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700249 } else if (S_ISDIR(inode->i_mode))
250 fuse_init_dir(inode);
251 else if (S_ISLNK(inode->i_mode))
252 fuse_init_symlink(inode);
253 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
254 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
255 fuse_init_common(inode);
256 init_special_inode(inode, inode->i_mode,
257 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800258 } else
259 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700260}
261
John Muir3b463ae2009-05-31 11:13:57 -0400262int fuse_inode_eq(struct inode *inode, void *_nodeidp)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700263{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700264 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700265 if (get_node_id(inode) == nodeid)
266 return 1;
267 else
268 return 0;
269}
270
271static int fuse_inode_set(struct inode *inode, void *_nodeidp)
272{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700273 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700274 get_fuse_inode(inode)->nodeid = nodeid;
275 return 0;
276}
277
Miklos Szeredib48badf2008-04-30 00:54:44 -0700278struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700279 int generation, struct fuse_attr *attr,
280 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700281{
282 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700283 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700284 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700285
286 retry:
287 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
288 if (!inode)
289 return NULL;
290
291 if ((inode->i_state & I_NEW)) {
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700292 inode->i_flags |= S_NOATIME|S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700293 inode->i_generation = generation;
294 inode->i_data.backing_dev_info = &fc->bdi;
295 fuse_init_inode(inode, attr);
296 unlock_new_inode(inode);
297 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700298 /* Inode has changed type, any I/O on the old should fail */
299 make_bad_inode(inode);
300 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700301 goto retry;
302 }
303
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700304 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700305 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100306 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700307 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700308 fuse_change_attributes(inode, attr, attr_valid, attr_version);
309
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700310 return inode;
311}
312
John Muir3b463ae2009-05-31 11:13:57 -0400313int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
314 loff_t offset, loff_t len)
315{
316 struct inode *inode;
317 pgoff_t pg_start;
318 pgoff_t pg_end;
319
320 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
321 if (!inode)
322 return -ENOENT;
323
324 fuse_invalidate_attr(inode);
325 if (offset >= 0) {
326 pg_start = offset >> PAGE_CACHE_SHIFT;
327 if (len <= 0)
328 pg_end = -1;
329 else
330 pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
331 invalidate_inode_pages2_range(inode->i_mapping,
332 pg_start, pg_end);
333 }
334 iput(inode);
335 return 0;
336}
337
Al Viro42faad92008-04-24 07:21:56 -0400338static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800339{
Al Viro42faad92008-04-24 07:21:56 -0400340 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800341}
342
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800343static void fuse_send_destroy(struct fuse_conn *fc)
344{
345 struct fuse_req *req = fc->destroy_req;
346 if (req && fc->conn_init) {
347 fc->destroy_req = NULL;
348 req->in.h.opcode = FUSE_DESTROY;
349 req->force = 1;
Maxim Patlasov8b41e672013-03-21 18:02:04 +0400350 req->background = 0;
Tejun Heob93f8582008-11-26 12:03:55 +0100351 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800352 fuse_put_request(fc, req);
353 }
354}
355
Tejun Heoa325f9b2009-04-14 10:54:52 +0900356static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700357{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900358 if (fc->bdi_initialized)
359 bdi_destroy(&fc->bdi);
360}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700361
Tejun Heo08cbf542009-04-14 10:54:53 +0900362void fuse_conn_kill(struct fuse_conn *fc)
Tejun Heoa325f9b2009-04-14 10:54:52 +0900363{
Miklos Szeredid7133112006-04-10 22:54:55 -0700364 spin_lock(&fc->lock);
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800365 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700366 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400367 fc->initialized = 1;
Miklos Szeredid7133112006-04-10 22:54:55 -0700368 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700369 /* Flush all readers on this fs */
Jeff Dike385a17b2006-04-10 22:54:52 -0700370 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700371 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700372 wake_up_all(&fc->blocked_waitq);
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700373 wake_up_all(&fc->reserved_req_waitq);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900374}
Tejun Heo08cbf542009-04-14 10:54:53 +0900375EXPORT_SYMBOL_GPL(fuse_conn_kill);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900376
377static void fuse_put_super(struct super_block *sb)
378{
379 struct fuse_conn *fc = get_fuse_conn_super(sb);
380
381 fuse_send_destroy(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200382
Tejun Heoa325f9b2009-04-14 10:54:52 +0900383 fuse_conn_kill(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200384 mutex_lock(&fuse_mutex);
385 list_del(&fc->entry);
386 fuse_ctl_remove_conn(fc);
387 mutex_unlock(&fuse_mutex);
388 fuse_bdi_destroy(fc);
389
Miklos Szeredibafa9652006-06-25 05:48:51 -0700390 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700391}
392
Miklos Szeredie5e55582005-09-09 13:10:28 -0700393static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
394{
395 stbuf->f_type = FUSE_SUPER_MAGIC;
396 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800397 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700398 stbuf->f_blocks = attr->blocks;
399 stbuf->f_bfree = attr->bfree;
400 stbuf->f_bavail = attr->bavail;
401 stbuf->f_files = attr->files;
402 stbuf->f_ffree = attr->ffree;
403 stbuf->f_namelen = attr->namelen;
404 /* fsid is left zero */
405}
406
David Howells726c3342006-06-23 02:02:58 -0700407static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700408{
David Howells726c3342006-06-23 02:02:58 -0700409 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700410 struct fuse_conn *fc = get_fuse_conn_super(sb);
411 struct fuse_req *req;
412 struct fuse_statfs_out outarg;
413 int err;
414
Anatol Pomozovc2132c12013-01-14 22:30:00 -0800415 if (!fuse_allow_current_process(fc)) {
Miklos Szeredie57ac682007-10-18 03:06:58 -0700416 buf->f_type = FUSE_SUPER_MAGIC;
417 return 0;
418 }
419
Maxim Patlasovb111c8c2012-10-26 19:48:30 +0400420 req = fuse_get_req_nopages(fc);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700421 if (IS_ERR(req))
422 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700423
Miklos Szeredide5f1202006-01-06 00:19:37 -0800424 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700425 req->in.numargs = 0;
426 req->in.h.opcode = FUSE_STATFS;
Miklos Szeredi5b35e8e2006-09-29 01:59:34 -0700427 req->in.h.nodeid = get_node_id(dentry->d_inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700428 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800429 req->out.args[0].size =
430 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700431 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100432 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700433 err = req->out.h.error;
434 if (!err)
435 convert_fuse_statfs(buf, &outarg.st);
436 fuse_put_request(fc, req);
437 return err;
438}
439
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700440enum {
441 OPT_FD,
442 OPT_ROOTMODE,
443 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700444 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700445 OPT_DEFAULT_PERMISSIONS,
446 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700447 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800448 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700449 OPT_ERR
450};
451
Steven Whitehousea447c092008-10-13 10:46:57 +0100452static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700453 {OPT_FD, "fd=%u"},
454 {OPT_ROOTMODE, "rootmode=%o"},
455 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700456 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700457 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
458 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700459 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800460 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700461 {OPT_ERR, NULL}
462};
463
Miklos Szeredid8091612006-12-06 20:35:48 -0800464static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700465{
466 char *p;
467 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700468 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800469 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700470
471 while ((p = strsep(&opt, ",")) != NULL) {
472 int token;
473 int value;
474 substring_t args[MAX_OPT_ARGS];
475 if (!*p)
476 continue;
477
478 token = match_token(p, tokens, args);
479 switch (token) {
480 case OPT_FD:
481 if (match_int(&args[0], &value))
482 return 0;
483 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700484 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700485 break;
486
487 case OPT_ROOTMODE:
488 if (match_octal(&args[0], &value))
489 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700490 if (!fuse_valid_type(value))
491 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700492 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700493 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700494 break;
495
496 case OPT_USER_ID:
497 if (match_int(&args[0], &value))
498 return 0;
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800499 d->user_id = make_kuid(current_user_ns(), value);
500 if (!uid_valid(d->user_id))
501 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700502 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700503 break;
504
Miklos Szeredi87729a52005-09-09 13:10:34 -0700505 case OPT_GROUP_ID:
506 if (match_int(&args[0], &value))
507 return 0;
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800508 d->group_id = make_kgid(current_user_ns(), value);
509 if (!gid_valid(d->group_id))
510 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700511 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700512 break;
513
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700514 case OPT_DEFAULT_PERMISSIONS:
515 d->flags |= FUSE_DEFAULT_PERMISSIONS;
516 break;
517
518 case OPT_ALLOW_OTHER:
519 d->flags |= FUSE_ALLOW_OTHER;
520 break;
521
Miklos Szeredidb50b962005-09-09 13:10:33 -0700522 case OPT_MAX_READ:
523 if (match_int(&args[0], &value))
524 return 0;
525 d->max_read = value;
526 break;
527
Miklos Szeredid8091612006-12-06 20:35:48 -0800528 case OPT_BLKSIZE:
529 if (!is_bdev || match_int(&args[0], &value))
530 return 0;
531 d->blksize = value;
532 break;
533
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700534 default:
535 return 0;
536 }
537 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700538
539 if (!d->fd_present || !d->rootmode_present ||
540 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700541 return 0;
542
543 return 1;
544}
545
Al Viro34c80b12011-12-08 21:32:45 -0500546static int fuse_show_options(struct seq_file *m, struct dentry *root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700547{
Al Viro34c80b12011-12-08 21:32:45 -0500548 struct super_block *sb = root->d_sb;
549 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700550
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800551 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id));
552 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id));
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700553 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
554 seq_puts(m, ",default_permissions");
555 if (fc->flags & FUSE_ALLOW_OTHER)
556 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700557 if (fc->max_read != ~0)
558 seq_printf(m, ",max_read=%u", fc->max_read);
Al Viro34c80b12011-12-08 21:32:45 -0500559 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
560 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700561 return 0;
562}
563
Tejun Heoa325f9b2009-04-14 10:54:52 +0900564void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700565{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100566 memset(fc, 0, sizeof(*fc));
567 spin_lock_init(&fc->lock);
John Muir3b463ae2009-05-31 11:13:57 -0400568 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100569 atomic_set(&fc->count, 1);
570 init_waitqueue_head(&fc->waitq);
571 init_waitqueue_head(&fc->blocked_waitq);
572 init_waitqueue_head(&fc->reserved_req_waitq);
573 INIT_LIST_HEAD(&fc->pending);
574 INIT_LIST_HEAD(&fc->processing);
575 INIT_LIST_HEAD(&fc->io);
576 INIT_LIST_HEAD(&fc->interrupts);
577 INIT_LIST_HEAD(&fc->bg_queue);
578 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100579 fc->forget_list_tail = &fc->forget_list_head;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100580 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700581 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
582 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100583 fc->khctr = 0;
584 fc->polled_files = RB_ROOT;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100585 fc->reqctr = 0;
Maxim Patlasov0aada882013-03-21 18:02:28 +0400586 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400587 fc->initialized = 0;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100588 fc->attr_version = 1;
589 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700590}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100591EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700592
Miklos Szeredibafa9652006-06-25 05:48:51 -0700593void fuse_conn_put(struct fuse_conn *fc)
594{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700595 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800596 if (fc->destroy_req)
597 fuse_request_free(fc->destroy_req);
Tejun Heo43901aa2008-11-26 12:03:56 +0100598 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700599 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700600}
Tejun Heo08cbf542009-04-14 10:54:53 +0900601EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700602
603struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
604{
605 atomic_inc(&fc->count);
606 return fc;
607}
Tejun Heo08cbf542009-04-14 10:54:53 +0900608EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700609
Tejun Heob93f8582008-11-26 12:03:55 +0100610static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700611{
612 struct fuse_attr attr;
613 memset(&attr, 0, sizeof(attr));
614
615 attr.mode = mode;
616 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700617 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700618 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700619}
620
Miklos Szeredi1729a162008-11-26 12:03:54 +0100621struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700622 u64 nodeid;
623 u32 generation;
624};
625
626static struct dentry *fuse_get_dentry(struct super_block *sb,
627 struct fuse_inode_handle *handle)
628{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700629 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700630 struct inode *inode;
631 struct dentry *entry;
632 int err = -ESTALE;
633
634 if (handle->nodeid == 0)
635 goto out_err;
636
637 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700638 if (!inode) {
639 struct fuse_entry_out outarg;
640 struct qstr name;
641
642 if (!fc->export_support)
643 goto out_err;
644
645 name.len = 1;
646 name.name = ".";
647 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
648 &inode);
649 if (err && err != -ENOENT)
650 goto out_err;
651 if (err || !inode) {
652 err = -ESTALE;
653 goto out_err;
654 }
655 err = -EIO;
656 if (get_node_id(inode) != handle->nodeid)
657 goto out_iput;
658 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700659 err = -ESTALE;
660 if (inode->i_generation != handle->generation)
661 goto out_iput;
662
Christoph Hellwig44003722008-08-11 15:49:04 +0200663 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500664 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700665 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700666
667 return entry;
668
669 out_iput:
670 iput(inode);
671 out_err:
672 return ERR_PTR(err);
673}
674
Al Virob0b03822012-04-02 14:34:06 -0400675static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
676 struct inode *parent)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700677{
Al Virob0b03822012-04-02 14:34:06 -0400678 int len = parent ? 6 : 3;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700679 u64 nodeid;
680 u32 generation;
681
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530682 if (*max_len < len) {
683 *max_len = len;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900684 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530685 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700686
687 nodeid = get_fuse_inode(inode)->nodeid;
688 generation = inode->i_generation;
689
690 fh[0] = (u32)(nodeid >> 32);
691 fh[1] = (u32)(nodeid & 0xffffffff);
692 fh[2] = generation;
693
Al Virob0b03822012-04-02 14:34:06 -0400694 if (parent) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700695 nodeid = get_fuse_inode(parent)->nodeid;
696 generation = parent->i_generation;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700697
698 fh[3] = (u32)(nodeid >> 32);
699 fh[4] = (u32)(nodeid & 0xffffffff);
700 fh[5] = generation;
701 }
702
703 *max_len = len;
Al Virob0b03822012-04-02 14:34:06 -0400704 return parent ? 0x82 : 0x81;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700705}
706
707static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
708 struct fid *fid, int fh_len, int fh_type)
709{
710 struct fuse_inode_handle handle;
711
712 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
713 return NULL;
714
715 handle.nodeid = (u64) fid->raw[0] << 32;
716 handle.nodeid |= (u64) fid->raw[1];
717 handle.generation = fid->raw[2];
718 return fuse_get_dentry(sb, &handle);
719}
720
721static struct dentry *fuse_fh_to_parent(struct super_block *sb,
722 struct fid *fid, int fh_len, int fh_type)
723{
724 struct fuse_inode_handle parent;
725
726 if (fh_type != 0x82 || fh_len < 6)
727 return NULL;
728
729 parent.nodeid = (u64) fid->raw[3] << 32;
730 parent.nodeid |= (u64) fid->raw[4];
731 parent.generation = fid->raw[5];
732 return fuse_get_dentry(sb, &parent);
733}
734
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700735static struct dentry *fuse_get_parent(struct dentry *child)
736{
737 struct inode *child_inode = child->d_inode;
738 struct fuse_conn *fc = get_fuse_conn(child_inode);
739 struct inode *inode;
740 struct dentry *parent;
741 struct fuse_entry_out outarg;
742 struct qstr name;
743 int err;
744
745 if (!fc->export_support)
746 return ERR_PTR(-ESTALE);
747
748 name.len = 2;
749 name.name = "..";
750 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
751 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200752 if (err) {
753 if (err == -ENOENT)
754 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700755 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700756 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200757
758 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500759 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700760 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700761
762 return parent;
763}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700764
765static const struct export_operations fuse_export_operations = {
766 .fh_to_dentry = fuse_fh_to_dentry,
767 .fh_to_parent = fuse_fh_to_parent,
768 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700769 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700770};
771
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800772static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700773 .alloc_inode = fuse_alloc_inode,
774 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400775 .evict_inode = fuse_evict_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700776 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700777 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700778 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800779 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700780 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700781 .show_options = fuse_show_options,
782};
783
Csaba Henk487ea5a2009-08-26 19:17:22 +0200784static void sanitize_global_limit(unsigned *limit)
785{
786 if (*limit == 0)
Jiang Liu0ed5fd12013-07-03 15:03:43 -0700787 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
Csaba Henk487ea5a2009-08-26 19:17:22 +0200788 sizeof(struct fuse_req);
789
790 if (*limit >= 1 << 16)
791 *limit = (1 << 16) - 1;
792}
793
794static int set_global_limit(const char *val, struct kernel_param *kp)
795{
796 int rv;
797
798 rv = param_set_uint(val, kp);
799 if (rv)
800 return rv;
801
802 sanitize_global_limit((unsigned *)kp->arg);
803
804 return 0;
805}
806
807static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
808{
809 int cap_sys_admin = capable(CAP_SYS_ADMIN);
810
811 if (arg->minor < 13)
812 return;
813
814 sanitize_global_limit(&max_user_bgreq);
815 sanitize_global_limit(&max_user_congthresh);
816
817 if (arg->max_background) {
818 fc->max_background = arg->max_background;
819
820 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
821 fc->max_background = max_user_bgreq;
822 }
823 if (arg->congestion_threshold) {
824 fc->congestion_threshold = arg->congestion_threshold;
825
826 if (!cap_sys_admin &&
827 fc->congestion_threshold > max_user_congthresh)
828 fc->congestion_threshold = max_user_congthresh;
829 }
830}
831
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800832static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
833{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800834 struct fuse_init_out *arg = &req->misc.init_out;
835
836 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
837 fc->conn_error = 1;
838 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800839 unsigned long ra_pages;
840
Csaba Henk487ea5a2009-08-26 19:17:22 +0200841 process_init_limits(fc, arg);
842
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800843 if (arg->minor >= 6) {
844 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
845 if (arg->flags & FUSE_ASYNC_READ)
846 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700847 if (!(arg->flags & FUSE_POSIX_LOCKS))
848 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200849 if (arg->minor >= 17) {
850 if (!(arg->flags & FUSE_FLOCK_LOCKS))
851 fc->no_flock = 1;
Miklos Szeredi24114502011-09-12 09:31:49 +0200852 } else {
853 if (!(arg->flags & FUSE_POSIX_LOCKS))
854 fc->no_flock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200855 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700856 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
857 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700858 if (arg->minor >= 9) {
859 /* LOOKUP has dependency on proto version */
860 if (arg->flags & FUSE_EXPORT_SUPPORT)
861 fc->export_support = 1;
862 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700863 if (arg->flags & FUSE_BIG_WRITES)
864 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200865 if (arg->flags & FUSE_DONT_MASK)
866 fc->dont_mask = 1;
Brian Foster72d0d242012-07-16 15:23:48 -0400867 if (arg->flags & FUSE_AUTO_INVAL_DATA)
868 fc->auto_inval_data = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200869 if (arg->flags & FUSE_DO_READDIRPLUS) {
Anand V. Avati0b05b182012-08-19 08:53:23 -0400870 fc->do_readdirplus = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200871 if (arg->flags & FUSE_READDIRPLUS_AUTO)
872 fc->readdirplus_auto = 1;
873 }
Miklos Szeredi60b9df72013-05-01 14:37:21 +0200874 if (arg->flags & FUSE_ASYNC_DIO)
875 fc->async_dio = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700876 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800877 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700878 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200879 fc->no_flock = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700880 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800881
882 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800883 fc->minor = arg->minor;
884 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200885 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800886 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800887 }
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400888 fc->initialized = 1;
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700889 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800890}
891
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700892static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800893{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800894 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800895
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800896 arg->major = FUSE_KERNEL_VERSION;
897 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800898 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700899 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200900 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
Miklos Szeredi69fe05c2012-07-18 16:09:40 +0200901 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
Anand V. Avati0b05b182012-08-19 08:53:23 -0400902 FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
Miklos Szeredi60b9df72013-05-01 14:37:21 +0200903 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800904 req->in.h.opcode = FUSE_INIT;
905 req->in.numargs = 1;
906 req->in.args[0].size = sizeof(*arg);
907 req->in.args[0].value = arg;
908 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800909 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800910 with interface version < 7.5. Rest of init_out is zeroed
911 by do_get_request(), so a short reply is not a problem */
912 req->out.argvar = 1;
913 req->out.args[0].size = sizeof(struct fuse_init_out);
914 req->out.args[0].value = &req->misc.init_out;
915 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100916 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800917}
918
Tejun Heo43901aa2008-11-26 12:03:56 +0100919static void fuse_free_conn(struct fuse_conn *fc)
920{
Al Virodd3e2c52013-10-03 21:21:39 -0400921 kfree_rcu(fc, rcu);
Tejun Heo43901aa2008-11-26 12:03:56 +0100922}
923
Tejun Heoa325f9b2009-04-14 10:54:52 +0900924static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
925{
926 int err;
927
Jens Axboed9938312009-06-12 14:45:52 +0200928 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900929 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900930 /* fuse does it's own writeback accounting */
Maxim Patlasov5a537482013-09-11 14:22:46 -0700931 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900932
933 err = bdi_init(&fc->bdi);
934 if (err)
935 return err;
936
937 fc->bdi_initialized = 1;
938
939 if (sb->s_bdev) {
940 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
941 MAJOR(fc->dev), MINOR(fc->dev));
942 } else {
943 err = bdi_register_dev(&fc->bdi, fc->dev);
944 }
945
946 if (err)
947 return err;
948
949 /*
950 * For a single fuse filesystem use max 1% of dirty +
951 * writeback threshold.
952 *
953 * This gives about 1M of write buffer for memory maps on a
954 * machine with 1G and 10% dirty_ratio, which should be more
955 * than enough.
956 *
957 * Privileged users can raise it by writing to
958 *
959 * /sys/class/bdi/<bdi>/max_ratio
960 */
961 bdi_set_max_ratio(&fc->bdi, 1);
962
963 return 0;
964}
965
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700966static int fuse_fill_super(struct super_block *sb, void *data, int silent)
967{
968 struct fuse_conn *fc;
969 struct inode *root;
970 struct fuse_mount_data d;
971 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800972 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700973 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700974 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -0800975 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700976
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100977 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -0700978 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100979 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -0700980
Al Viro9e1f1de2011-06-03 18:24:58 -0400981 sb->s_flags &= ~MS_NOSEC;
982
Miklos Szeredid8091612006-12-06 20:35:48 -0800983 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100984 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700985
Miklos Szeredid8091612006-12-06 20:35:48 -0800986 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800987#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100988 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -0800989 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100990 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800991#endif
Miklos Szeredid8091612006-12-06 20:35:48 -0800992 } else {
993 sb->s_blocksize = PAGE_CACHE_SIZE;
994 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
995 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700996 sb->s_magic = FUSE_SUPER_MAGIC;
997 sb->s_op = &fuse_super_operations;
998 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredi0a2da9b2012-04-11 11:45:06 +0200999 sb->s_time_gran = 1;
Miklos Szeredidbd561d2008-07-25 01:49:00 -07001000 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001001
1002 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001003 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001004 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001005 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001006
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001007 if ((file->f_op != &fuse_dev_operations) ||
1008 (file->f_cred->user_ns != &init_user_ns))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001009 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -07001010
Tejun Heo0d179aa2008-11-26 12:03:55 +01001011 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001012 err = -ENOMEM;
1013 if (!fc)
1014 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001015
Tejun Heoa325f9b2009-04-14 10:54:52 +09001016 fuse_conn_init(fc);
1017
1018 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -04001019 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001020 err = fuse_bdi_init(fc, sb);
1021 if (err)
1022 goto err_put_conn;
Tejun Heo0d179aa2008-11-26 12:03:55 +01001023
Jens Axboe32a88aa2009-09-16 15:02:33 +02001024 sb->s_bdi = &fc->bdi;
1025
Miklos Szeredie0a43dd2009-06-30 20:12:23 +02001026 /* Handle umasking inside the fuse code */
1027 if (sb->s_flags & MS_POSIXACL)
1028 fc->dont_mask = 1;
1029 sb->s_flags |= MS_POSIXACL;
1030
Tejun Heo43901aa2008-11-26 12:03:56 +01001031 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001032 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001033 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001034 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +02001035 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001036
Miklos Szeredif543f252006-01-16 22:14:35 -08001037 /* Used by get_root_inode() */
1038 sb->s_fs_info = fc;
1039
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001040 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +01001041 root = fuse_get_root_inode(sb, d.rootmode);
Al Viro48fde702012-01-08 22:15:13 -05001042 root_dentry = d_make_root(root);
1043 if (!root_dentry)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001044 goto err_put_conn;
Al Viroc35eebe2010-12-18 11:15:22 -05001045 /* only now - we want root dentry with NULL ->d_op */
1046 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -08001047
Maxim Patlasov4250c062012-10-26 19:48:07 +04001048 init_req = fuse_request_alloc(0);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001049 if (!init_req)
1050 goto err_put_root;
Maxim Patlasov8b41e672013-03-21 18:02:04 +04001051 init_req->background = 1;
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001052
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001053 if (is_bdev) {
Maxim Patlasov4250c062012-10-26 19:48:07 +04001054 fc->destroy_req = fuse_request_alloc(0);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001055 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001056 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001057 }
1058
Miklos Szeredibafa9652006-06-25 05:48:51 -07001059 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001060 err = -EINVAL;
1061 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001062 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001063
Miklos Szeredibafa9652006-06-25 05:48:51 -07001064 err = fuse_ctl_add_conn(fc);
1065 if (err)
1066 goto err_unlock;
1067
1068 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001069 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -08001070 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001071 file->private_data = fuse_conn_get(fc);
1072 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001073 /*
1074 * atomic_dec_and_test() in fput() provides the necessary
1075 * memory barrier for file->private_data to be visible on all
1076 * CPUs after this
1077 */
1078 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001079
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001080 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001081
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001082 return 0;
1083
Miklos Szeredibafa9652006-06-25 05:48:51 -07001084 err_unlock:
1085 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001086 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001087 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001088 err_put_root:
1089 dput(root_dentry);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001090 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001091 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001092 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001093 err_fput:
1094 fput(file);
1095 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001096 return err;
1097}
1098
Al Viro3c26ff62010-07-25 11:46:36 +04001099static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001100 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001101 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001102{
Al Viro3c26ff62010-07-25 11:46:36 +04001103 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001104}
1105
John Muir3b463ae2009-05-31 11:13:57 -04001106static void fuse_kill_sb_anon(struct super_block *sb)
1107{
1108 struct fuse_conn *fc = get_fuse_conn_super(sb);
1109
1110 if (fc) {
1111 down_write(&fc->killsb);
1112 fc->sb = NULL;
1113 up_write(&fc->killsb);
1114 }
1115
1116 kill_anon_super(sb);
1117}
1118
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001119static struct file_system_type fuse_fs_type = {
1120 .owner = THIS_MODULE,
1121 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001122 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001123 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001124 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001125};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001126MODULE_ALIAS_FS("fuse");
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001127
1128#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001129static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001130 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001131 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001132{
Al Viro152a0832010-07-25 00:46:55 +04001133 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001134}
1135
John Muir3b463ae2009-05-31 11:13:57 -04001136static void fuse_kill_sb_blk(struct super_block *sb)
1137{
1138 struct fuse_conn *fc = get_fuse_conn_super(sb);
1139
1140 if (fc) {
1141 down_write(&fc->killsb);
1142 fc->sb = NULL;
1143 up_write(&fc->killsb);
1144 }
1145
1146 kill_block_super(sb);
1147}
1148
Miklos Szeredid6392f82006-12-06 20:35:44 -08001149static struct file_system_type fuseblk_fs_type = {
1150 .owner = THIS_MODULE,
1151 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001152 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001153 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001154 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001155};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001156MODULE_ALIAS_FS("fuseblk");
Miklos Szeredid6392f82006-12-06 20:35:44 -08001157
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001158static inline int register_fuseblk(void)
1159{
1160 return register_filesystem(&fuseblk_fs_type);
1161}
1162
1163static inline void unregister_fuseblk(void)
1164{
1165 unregister_filesystem(&fuseblk_fs_type);
1166}
1167#else
1168static inline int register_fuseblk(void)
1169{
1170 return 0;
1171}
1172
1173static inline void unregister_fuseblk(void)
1174{
1175}
1176#endif
1177
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001178static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001179{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001180 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001181
Christoph Lametera35afb82007-05-16 22:10:57 -07001182 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001183}
1184
1185static int __init fuse_fs_init(void)
1186{
1187 int err;
1188
Miklos Szeredid6392f82006-12-06 20:35:44 -08001189 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1190 sizeof(struct fuse_inode),
1191 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001192 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001193 err = -ENOMEM;
1194 if (!fuse_inode_cachep)
Al Viro988f0322011-12-13 12:25:27 -05001195 goto out;
1196
1197 err = register_fuseblk();
1198 if (err)
1199 goto out2;
1200
1201 err = register_filesystem(&fuse_fs_type);
1202 if (err)
1203 goto out3;
Miklos Szeredid6392f82006-12-06 20:35:44 -08001204
1205 return 0;
1206
Al Viro988f0322011-12-13 12:25:27 -05001207 out3:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001208 unregister_fuseblk();
Al Viro988f0322011-12-13 12:25:27 -05001209 out2:
1210 kmem_cache_destroy(fuse_inode_cachep);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001211 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001212 return err;
1213}
1214
1215static void fuse_fs_cleanup(void)
1216{
1217 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001218 unregister_fuseblk();
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001219
1220 /*
1221 * Make sure all delayed rcu free inodes are flushed before we
1222 * destroy cache.
1223 */
1224 rcu_barrier();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001225 kmem_cache_destroy(fuse_inode_cachep);
1226}
1227
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001228static struct kobject *fuse_kobj;
1229static struct kobject *connections_kobj;
1230
Miklos Szeredif543f252006-01-16 22:14:35 -08001231static int fuse_sysfs_init(void)
1232{
1233 int err;
1234
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001235 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001236 if (!fuse_kobj) {
1237 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001238 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001239 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001240
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001241 connections_kobj = kobject_create_and_add("connections", fuse_kobj);
1242 if (!connections_kobj) {
1243 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001244 goto out_fuse_unregister;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001245 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001246
1247 return 0;
1248
1249 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001250 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001251 out_err:
1252 return err;
1253}
1254
1255static void fuse_sysfs_cleanup(void)
1256{
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001257 kobject_put(connections_kobj);
1258 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001259}
1260
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001261static int __init fuse_init(void)
1262{
1263 int res;
1264
Miklos Szeredi1729a162008-11-26 12:03:54 +01001265 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001266 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1267
Miklos Szeredibafa9652006-06-25 05:48:51 -07001268 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001269 res = fuse_fs_init();
1270 if (res)
1271 goto err;
1272
Miklos Szeredi334f4852005-09-09 13:10:27 -07001273 res = fuse_dev_init();
1274 if (res)
1275 goto err_fs_cleanup;
1276
Miklos Szeredif543f252006-01-16 22:14:35 -08001277 res = fuse_sysfs_init();
1278 if (res)
1279 goto err_dev_cleanup;
1280
Miklos Szeredibafa9652006-06-25 05:48:51 -07001281 res = fuse_ctl_init();
1282 if (res)
1283 goto err_sysfs_cleanup;
1284
Csaba Henk487ea5a2009-08-26 19:17:22 +02001285 sanitize_global_limit(&max_user_bgreq);
1286 sanitize_global_limit(&max_user_congthresh);
1287
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001288 return 0;
1289
Miklos Szeredibafa9652006-06-25 05:48:51 -07001290 err_sysfs_cleanup:
1291 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001292 err_dev_cleanup:
1293 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001294 err_fs_cleanup:
1295 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001296 err:
1297 return res;
1298}
1299
1300static void __exit fuse_exit(void)
1301{
1302 printk(KERN_DEBUG "fuse exit\n");
1303
Miklos Szeredibafa9652006-06-25 05:48:51 -07001304 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001305 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001306 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001307 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001308}
1309
1310module_init(fuse_init);
1311module_exit(fuse_exit);