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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;
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{
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700126 truncate_inode_pages_final(&inode->i_data);
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{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400138 sync_filesystem(sb);
Miklos Szeredi71421252006-06-25 05:48:52 -0700139 if (*flags & MS_MANDLOCK)
140 return -EINVAL;
141
142 return 0;
143}
144
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400145/*
146 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
147 * so that it will fit.
148 */
149static ino_t fuse_squash_ino(u64 ino64)
150{
151 ino_t ino = (ino_t) ino64;
152 if (sizeof(ino_t) < sizeof(u64))
153 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8;
154 return ino;
155}
156
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700157void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
158 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700159{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700160 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700161 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700162
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700163 fi->attr_version = ++fc->attr_version;
164 fi->i_time = attr_valid;
165
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400166 inode->i_ino = fuse_squash_ino(attr->ino);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700167 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200168 set_nlink(inode, attr->nlink);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800169 inode->i_uid = make_kuid(&init_user_ns, attr->uid);
170 inode->i_gid = make_kgid(&init_user_ns, attr->gid);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700171 inode->i_blocks = attr->blocks;
172 inode->i_atime.tv_sec = attr->atime;
173 inode->i_atime.tv_nsec = attr->atimensec;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400174 /* mtime from server may be stale due to local buffered write */
175 if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) {
176 inode->i_mtime.tv_sec = attr->mtime;
177 inode->i_mtime.tv_nsec = attr->mtimensec;
Maxim Patlasov31f32672014-04-28 14:19:24 +0200178 inode->i_ctime.tv_sec = attr->ctime;
179 inode->i_ctime.tv_nsec = attr->ctimensec;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400180 }
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700181
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700182 if (attr->blksize != 0)
183 inode->i_blkbits = ilog2(attr->blksize);
184 else
185 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
186
Miklos Szerediebc14c42007-10-16 23:31:03 -0700187 /*
188 * Don't set the sticky bit in i_mode, unless we want the VFS
189 * to check permissions. This prevents failures due to the
190 * check in may_delete().
191 */
192 fi->orig_i_mode = inode->i_mode;
193 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
194 inode->i_mode &= ~S_ISVTX;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400195
196 fi->orig_ino = attr->ino;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700197}
198
199void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
200 u64 attr_valid, u64 attr_version)
201{
202 struct fuse_conn *fc = get_fuse_conn(inode);
203 struct fuse_inode *fi = get_fuse_inode(inode);
Pavel Emelyanov83732002013-10-10 17:10:46 +0400204 bool is_wb = fc->writeback_cache;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700205 loff_t oldsize;
Brian Fostereed21792012-07-16 15:23:49 -0400206 struct timespec old_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700207
208 spin_lock(&fc->lock);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +0400209 if ((attr_version != 0 && fi->attr_version > attr_version) ||
210 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700211 spin_unlock(&fc->lock);
212 return;
213 }
214
Brian Fostereed21792012-07-16 15:23:49 -0400215 old_mtime = inode->i_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700216 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700217
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700218 oldsize = inode->i_size;
Pavel Emelyanov83732002013-10-10 17:10:46 +0400219 /*
220 * In case of writeback_cache enabled, the cached writes beyond EOF
221 * extend local i_size without keeping userspace server in sync. So,
222 * attr->size coming from server can be stale. We cannot trust it.
223 */
224 if (!is_wb || !S_ISREG(inode->i_mode))
225 i_size_write(inode, attr->size);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700226 spin_unlock(&fc->lock);
227
Pavel Emelyanov83732002013-10-10 17:10:46 +0400228 if (!is_wb && S_ISREG(inode->i_mode)) {
Brian Fostereed21792012-07-16 15:23:49 -0400229 bool inval = false;
230
231 if (oldsize != attr->size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700232 truncate_pagecache(inode, attr->size);
Brian Fostereed21792012-07-16 15:23:49 -0400233 inval = true;
234 } else if (fc->auto_inval_data) {
235 struct timespec new_mtime = {
236 .tv_sec = attr->mtime,
237 .tv_nsec = attr->mtimensec,
238 };
239
240 /*
241 * Auto inval mode also checks and invalidates if mtime
242 * has changed.
243 */
244 if (!timespec_equal(&old_mtime, &new_mtime))
245 inval = true;
246 }
247
248 if (inval)
249 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700250 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700251}
252
253static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
254{
255 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700256 inode->i_size = attr->size;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400257 inode->i_mtime.tv_sec = attr->mtime;
258 inode->i_mtime.tv_nsec = attr->mtimensec;
Maxim Patlasov31f32672014-04-28 14:19:24 +0200259 inode->i_ctime.tv_sec = attr->ctime;
260 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700261 if (S_ISREG(inode->i_mode)) {
262 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700263 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700264 } else if (S_ISDIR(inode->i_mode))
265 fuse_init_dir(inode);
266 else if (S_ISLNK(inode->i_mode))
267 fuse_init_symlink(inode);
268 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
269 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
270 fuse_init_common(inode);
271 init_special_inode(inode, inode->i_mode,
272 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800273 } else
274 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700275}
276
John Muir3b463ae2009-05-31 11:13:57 -0400277int fuse_inode_eq(struct inode *inode, void *_nodeidp)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700278{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700279 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700280 if (get_node_id(inode) == nodeid)
281 return 1;
282 else
283 return 0;
284}
285
286static int fuse_inode_set(struct inode *inode, void *_nodeidp)
287{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700288 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700289 get_fuse_inode(inode)->nodeid = nodeid;
290 return 0;
291}
292
Miklos Szeredib48badf2008-04-30 00:54:44 -0700293struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700294 int generation, struct fuse_attr *attr,
295 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700296{
297 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700298 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700299 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700300
301 retry:
302 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
303 if (!inode)
304 return NULL;
305
306 if ((inode->i_state & I_NEW)) {
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400307 inode->i_flags |= S_NOATIME;
Maxim Patlasovd31433c2014-04-28 14:19:21 +0200308 if (!fc->writeback_cache || !S_ISREG(attr->mode))
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400309 inode->i_flags |= S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700310 inode->i_generation = generation;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700311 fuse_init_inode(inode, attr);
312 unlock_new_inode(inode);
313 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700314 /* Inode has changed type, any I/O on the old should fail */
315 make_bad_inode(inode);
316 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700317 goto retry;
318 }
319
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700320 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700321 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100322 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700323 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700324 fuse_change_attributes(inode, attr, attr_valid, attr_version);
325
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700326 return inode;
327}
328
John Muir3b463ae2009-05-31 11:13:57 -0400329int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
330 loff_t offset, loff_t len)
331{
332 struct inode *inode;
333 pgoff_t pg_start;
334 pgoff_t pg_end;
335
336 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
337 if (!inode)
338 return -ENOENT;
339
340 fuse_invalidate_attr(inode);
341 if (offset >= 0) {
342 pg_start = offset >> PAGE_CACHE_SHIFT;
343 if (len <= 0)
344 pg_end = -1;
345 else
346 pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
347 invalidate_inode_pages2_range(inode->i_mapping,
348 pg_start, pg_end);
349 }
350 iput(inode);
351 return 0;
352}
353
Al Viro42faad92008-04-24 07:21:56 -0400354static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800355{
Al Viro42faad92008-04-24 07:21:56 -0400356 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800357}
358
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800359static void fuse_send_destroy(struct fuse_conn *fc)
360{
361 struct fuse_req *req = fc->destroy_req;
362 if (req && fc->conn_init) {
363 fc->destroy_req = NULL;
364 req->in.h.opcode = FUSE_DESTROY;
Miklos Szeredi825d6d32015-07-01 16:25:58 +0200365 __set_bit(FR_FORCE, &req->flags);
366 __clear_bit(FR_BACKGROUND, &req->flags);
Tejun Heob93f8582008-11-26 12:03:55 +0100367 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800368 fuse_put_request(fc, req);
369 }
370}
371
Tejun Heoa325f9b2009-04-14 10:54:52 +0900372static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700373{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900374 if (fc->bdi_initialized)
375 bdi_destroy(&fc->bdi);
376}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700377
Tejun Heoa325f9b2009-04-14 10:54:52 +0900378static void fuse_put_super(struct super_block *sb)
379{
380 struct fuse_conn *fc = get_fuse_conn_super(sb);
381
382 fuse_send_destroy(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200383
Miklos Szeredi580640b2014-12-12 09:49:04 +0100384 fuse_abort_conn(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200385 mutex_lock(&fuse_mutex);
386 list_del(&fc->entry);
387 fuse_ctl_remove_conn(fc);
388 mutex_unlock(&fuse_mutex);
389 fuse_bdi_destroy(fc);
390
Miklos Szeredibafa9652006-06-25 05:48:51 -0700391 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700392}
393
Miklos Szeredie5e55582005-09-09 13:10:28 -0700394static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
395{
396 stbuf->f_type = FUSE_SUPER_MAGIC;
397 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800398 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700399 stbuf->f_blocks = attr->blocks;
400 stbuf->f_bfree = attr->bfree;
401 stbuf->f_bavail = attr->bavail;
402 stbuf->f_files = attr->files;
403 stbuf->f_ffree = attr->ffree;
404 stbuf->f_namelen = attr->namelen;
405 /* fsid is left zero */
406}
407
David Howells726c3342006-06-23 02:02:58 -0700408static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700409{
David Howells726c3342006-06-23 02:02:58 -0700410 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700411 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredi70781872014-12-12 09:49:05 +0100412 FUSE_ARGS(args);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700413 struct fuse_statfs_out outarg;
414 int err;
415
Anatol Pomozovc2132c12013-01-14 22:30:00 -0800416 if (!fuse_allow_current_process(fc)) {
Miklos Szeredie57ac682007-10-18 03:06:58 -0700417 buf->f_type = FUSE_SUPER_MAGIC;
418 return 0;
419 }
420
Miklos Szeredide5f1202006-01-06 00:19:37 -0800421 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredi70781872014-12-12 09:49:05 +0100422 args.in.numargs = 0;
423 args.in.h.opcode = FUSE_STATFS;
David Howells2b0143b2015-03-17 22:25:59 +0000424 args.in.h.nodeid = get_node_id(d_inode(dentry));
Miklos Szeredi70781872014-12-12 09:49:05 +0100425 args.out.numargs = 1;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100426 args.out.args[0].size = sizeof(outarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100427 args.out.args[0].value = &outarg;
428 err = fuse_simple_request(fc, &args);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700429 if (!err)
430 convert_fuse_statfs(buf, &outarg.st);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700431 return err;
432}
433
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700434enum {
435 OPT_FD,
436 OPT_ROOTMODE,
437 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700438 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700439 OPT_DEFAULT_PERMISSIONS,
440 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700441 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800442 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700443 OPT_ERR
444};
445
Steven Whitehousea447c092008-10-13 10:46:57 +0100446static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700447 {OPT_FD, "fd=%u"},
448 {OPT_ROOTMODE, "rootmode=%o"},
449 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700450 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700451 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
452 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700453 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800454 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700455 {OPT_ERR, NULL}
456};
457
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200458static int fuse_match_uint(substring_t *s, unsigned int *res)
459{
460 int err = -ENOMEM;
461 char *buf = match_strdup(s);
462 if (buf) {
463 err = kstrtouint(buf, 10, res);
464 kfree(buf);
465 }
466 return err;
467}
468
Miklos Szeredid8091612006-12-06 20:35:48 -0800469static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700470{
471 char *p;
472 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700473 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800474 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700475
476 while ((p = strsep(&opt, ",")) != NULL) {
477 int token;
478 int value;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200479 unsigned uv;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700480 substring_t args[MAX_OPT_ARGS];
481 if (!*p)
482 continue;
483
484 token = match_token(p, tokens, args);
485 switch (token) {
486 case OPT_FD:
487 if (match_int(&args[0], &value))
488 return 0;
489 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700490 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700491 break;
492
493 case OPT_ROOTMODE:
494 if (match_octal(&args[0], &value))
495 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700496 if (!fuse_valid_type(value))
497 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700498 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700499 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700500 break;
501
502 case OPT_USER_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200503 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700504 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200505 d->user_id = make_kuid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800506 if (!uid_valid(d->user_id))
507 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700508 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700509 break;
510
Miklos Szeredi87729a52005-09-09 13:10:34 -0700511 case OPT_GROUP_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200512 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredi87729a52005-09-09 13:10:34 -0700513 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200514 d->group_id = make_kgid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800515 if (!gid_valid(d->group_id))
516 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700517 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700518 break;
519
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700520 case OPT_DEFAULT_PERMISSIONS:
521 d->flags |= FUSE_DEFAULT_PERMISSIONS;
522 break;
523
524 case OPT_ALLOW_OTHER:
525 d->flags |= FUSE_ALLOW_OTHER;
526 break;
527
Miklos Szeredidb50b962005-09-09 13:10:33 -0700528 case OPT_MAX_READ:
529 if (match_int(&args[0], &value))
530 return 0;
531 d->max_read = value;
532 break;
533
Miklos Szeredid8091612006-12-06 20:35:48 -0800534 case OPT_BLKSIZE:
535 if (!is_bdev || match_int(&args[0], &value))
536 return 0;
537 d->blksize = value;
538 break;
539
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700540 default:
541 return 0;
542 }
543 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700544
545 if (!d->fd_present || !d->rootmode_present ||
546 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700547 return 0;
548
549 return 1;
550}
551
Al Viro34c80b12011-12-08 21:32:45 -0500552static int fuse_show_options(struct seq_file *m, struct dentry *root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700553{
Al Viro34c80b12011-12-08 21:32:45 -0500554 struct super_block *sb = root->d_sb;
555 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700556
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800557 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id));
558 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id));
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700559 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
560 seq_puts(m, ",default_permissions");
561 if (fc->flags & FUSE_ALLOW_OTHER)
562 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700563 if (fc->max_read != ~0)
564 seq_printf(m, ",max_read=%u", fc->max_read);
Al Viro34c80b12011-12-08 21:32:45 -0500565 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
566 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700567 return 0;
568}
569
Miklos Szeredif88996a2015-07-01 16:26:01 +0200570static void fuse_iqueue_init(struct fuse_iqueue *fiq)
571{
572 memset(fiq, 0, sizeof(struct fuse_iqueue));
573 init_waitqueue_head(&fiq->waitq);
574 INIT_LIST_HEAD(&fiq->pending);
575 INIT_LIST_HEAD(&fiq->interrupts);
576 fiq->forget_list_tail = &fiq->forget_list_head;
Miklos Szeredie16714d2015-07-01 16:26:01 +0200577 fiq->connected = 1;
Miklos Szeredif88996a2015-07-01 16:26:01 +0200578}
579
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200580static void fuse_pqueue_init(struct fuse_pqueue *fpq)
581{
582 memset(fpq, 0, sizeof(struct fuse_pqueue));
Miklos Szeredi45a91cb2015-07-01 16:26:06 +0200583 spin_lock_init(&fpq->lock);
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200584 INIT_LIST_HEAD(&fpq->processing);
585 INIT_LIST_HEAD(&fpq->io);
Miklos Szeredie96edd92015-07-01 16:26:04 +0200586 fpq->connected = 1;
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200587}
588
Tejun Heoa325f9b2009-04-14 10:54:52 +0900589void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700590{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100591 memset(fc, 0, sizeof(*fc));
592 spin_lock_init(&fc->lock);
John Muir3b463ae2009-05-31 11:13:57 -0400593 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100594 atomic_set(&fc->count, 1);
Miklos Szeredic36960462015-07-01 16:26:09 +0200595 atomic_set(&fc->dev_count, 1);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100596 init_waitqueue_head(&fc->blocked_waitq);
597 init_waitqueue_head(&fc->reserved_req_waitq);
Miklos Szeredif88996a2015-07-01 16:26:01 +0200598 fuse_iqueue_init(&fc->iq);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100599 INIT_LIST_HEAD(&fc->bg_queue);
600 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredicc080e92015-07-01 16:26:08 +0200601 INIT_LIST_HEAD(&fc->devices);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100602 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700603 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
604 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100605 fc->khctr = 0;
606 fc->polled_files = RB_ROOT;
Maxim Patlasov0aada882013-03-21 18:02:28 +0400607 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400608 fc->initialized = 0;
Miklos Szeredie16714d2015-07-01 16:26:01 +0200609 fc->connected = 1;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100610 fc->attr_version = 1;
611 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700612}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100613EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700614
Miklos Szeredibafa9652006-06-25 05:48:51 -0700615void fuse_conn_put(struct fuse_conn *fc)
616{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700617 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800618 if (fc->destroy_req)
619 fuse_request_free(fc->destroy_req);
Tejun Heo43901aa2008-11-26 12:03:56 +0100620 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700621 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700622}
Tejun Heo08cbf542009-04-14 10:54:53 +0900623EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700624
625struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
626{
627 atomic_inc(&fc->count);
628 return fc;
629}
Tejun Heo08cbf542009-04-14 10:54:53 +0900630EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700631
Tejun Heob93f8582008-11-26 12:03:55 +0100632static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700633{
634 struct fuse_attr attr;
635 memset(&attr, 0, sizeof(attr));
636
637 attr.mode = mode;
638 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700639 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700640 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700641}
642
Miklos Szeredi1729a162008-11-26 12:03:54 +0100643struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700644 u64 nodeid;
645 u32 generation;
646};
647
648static struct dentry *fuse_get_dentry(struct super_block *sb,
649 struct fuse_inode_handle *handle)
650{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700651 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700652 struct inode *inode;
653 struct dentry *entry;
654 int err = -ESTALE;
655
656 if (handle->nodeid == 0)
657 goto out_err;
658
659 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700660 if (!inode) {
661 struct fuse_entry_out outarg;
662 struct qstr name;
663
664 if (!fc->export_support)
665 goto out_err;
666
667 name.len = 1;
668 name.name = ".";
669 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
670 &inode);
671 if (err && err != -ENOENT)
672 goto out_err;
673 if (err || !inode) {
674 err = -ESTALE;
675 goto out_err;
676 }
677 err = -EIO;
678 if (get_node_id(inode) != handle->nodeid)
679 goto out_iput;
680 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700681 err = -ESTALE;
682 if (inode->i_generation != handle->generation)
683 goto out_iput;
684
Christoph Hellwig44003722008-08-11 15:49:04 +0200685 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500686 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700687 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700688
689 return entry;
690
691 out_iput:
692 iput(inode);
693 out_err:
694 return ERR_PTR(err);
695}
696
Al Virob0b03822012-04-02 14:34:06 -0400697static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
698 struct inode *parent)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700699{
Al Virob0b03822012-04-02 14:34:06 -0400700 int len = parent ? 6 : 3;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700701 u64 nodeid;
702 u32 generation;
703
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530704 if (*max_len < len) {
705 *max_len = len;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900706 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530707 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700708
709 nodeid = get_fuse_inode(inode)->nodeid;
710 generation = inode->i_generation;
711
712 fh[0] = (u32)(nodeid >> 32);
713 fh[1] = (u32)(nodeid & 0xffffffff);
714 fh[2] = generation;
715
Al Virob0b03822012-04-02 14:34:06 -0400716 if (parent) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700717 nodeid = get_fuse_inode(parent)->nodeid;
718 generation = parent->i_generation;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700719
720 fh[3] = (u32)(nodeid >> 32);
721 fh[4] = (u32)(nodeid & 0xffffffff);
722 fh[5] = generation;
723 }
724
725 *max_len = len;
Al Virob0b03822012-04-02 14:34:06 -0400726 return parent ? 0x82 : 0x81;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700727}
728
729static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
730 struct fid *fid, int fh_len, int fh_type)
731{
732 struct fuse_inode_handle handle;
733
734 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
735 return NULL;
736
737 handle.nodeid = (u64) fid->raw[0] << 32;
738 handle.nodeid |= (u64) fid->raw[1];
739 handle.generation = fid->raw[2];
740 return fuse_get_dentry(sb, &handle);
741}
742
743static struct dentry *fuse_fh_to_parent(struct super_block *sb,
744 struct fid *fid, int fh_len, int fh_type)
745{
746 struct fuse_inode_handle parent;
747
748 if (fh_type != 0x82 || fh_len < 6)
749 return NULL;
750
751 parent.nodeid = (u64) fid->raw[3] << 32;
752 parent.nodeid |= (u64) fid->raw[4];
753 parent.generation = fid->raw[5];
754 return fuse_get_dentry(sb, &parent);
755}
756
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700757static struct dentry *fuse_get_parent(struct dentry *child)
758{
David Howells2b0143b2015-03-17 22:25:59 +0000759 struct inode *child_inode = d_inode(child);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700760 struct fuse_conn *fc = get_fuse_conn(child_inode);
761 struct inode *inode;
762 struct dentry *parent;
763 struct fuse_entry_out outarg;
764 struct qstr name;
765 int err;
766
767 if (!fc->export_support)
768 return ERR_PTR(-ESTALE);
769
770 name.len = 2;
771 name.name = "..";
772 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
773 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200774 if (err) {
775 if (err == -ENOENT)
776 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700777 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700778 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200779
780 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500781 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700782 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700783
784 return parent;
785}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700786
787static const struct export_operations fuse_export_operations = {
788 .fh_to_dentry = fuse_fh_to_dentry,
789 .fh_to_parent = fuse_fh_to_parent,
790 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700791 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700792};
793
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800794static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700795 .alloc_inode = fuse_alloc_inode,
796 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400797 .evict_inode = fuse_evict_inode,
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200798 .write_inode = fuse_write_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700799 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700800 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700801 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800802 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700803 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700804 .show_options = fuse_show_options,
805};
806
Csaba Henk487ea5a2009-08-26 19:17:22 +0200807static void sanitize_global_limit(unsigned *limit)
808{
809 if (*limit == 0)
Jiang Liu0ed5fd12013-07-03 15:03:43 -0700810 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
Csaba Henk487ea5a2009-08-26 19:17:22 +0200811 sizeof(struct fuse_req);
812
813 if (*limit >= 1 << 16)
814 *limit = (1 << 16) - 1;
815}
816
817static int set_global_limit(const char *val, struct kernel_param *kp)
818{
819 int rv;
820
821 rv = param_set_uint(val, kp);
822 if (rv)
823 return rv;
824
825 sanitize_global_limit((unsigned *)kp->arg);
826
827 return 0;
828}
829
830static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
831{
832 int cap_sys_admin = capable(CAP_SYS_ADMIN);
833
834 if (arg->minor < 13)
835 return;
836
837 sanitize_global_limit(&max_user_bgreq);
838 sanitize_global_limit(&max_user_congthresh);
839
840 if (arg->max_background) {
841 fc->max_background = arg->max_background;
842
843 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
844 fc->max_background = max_user_bgreq;
845 }
846 if (arg->congestion_threshold) {
847 fc->congestion_threshold = arg->congestion_threshold;
848
849 if (!cap_sys_admin &&
850 fc->congestion_threshold > max_user_congthresh)
851 fc->congestion_threshold = max_user_congthresh;
852 }
853}
854
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800855static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
856{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800857 struct fuse_init_out *arg = &req->misc.init_out;
858
859 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
860 fc->conn_error = 1;
861 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800862 unsigned long ra_pages;
863
Csaba Henk487ea5a2009-08-26 19:17:22 +0200864 process_init_limits(fc, arg);
865
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800866 if (arg->minor >= 6) {
867 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
868 if (arg->flags & FUSE_ASYNC_READ)
869 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700870 if (!(arg->flags & FUSE_POSIX_LOCKS))
871 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200872 if (arg->minor >= 17) {
873 if (!(arg->flags & FUSE_FLOCK_LOCKS))
874 fc->no_flock = 1;
Miklos Szeredi24114502011-09-12 09:31:49 +0200875 } else {
876 if (!(arg->flags & FUSE_POSIX_LOCKS))
877 fc->no_flock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200878 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700879 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
880 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700881 if (arg->minor >= 9) {
882 /* LOOKUP has dependency on proto version */
883 if (arg->flags & FUSE_EXPORT_SUPPORT)
884 fc->export_support = 1;
885 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700886 if (arg->flags & FUSE_BIG_WRITES)
887 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200888 if (arg->flags & FUSE_DONT_MASK)
889 fc->dont_mask = 1;
Brian Foster72d0d242012-07-16 15:23:48 -0400890 if (arg->flags & FUSE_AUTO_INVAL_DATA)
891 fc->auto_inval_data = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200892 if (arg->flags & FUSE_DO_READDIRPLUS) {
Anand V. Avati0b05b182012-08-19 08:53:23 -0400893 fc->do_readdirplus = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200894 if (arg->flags & FUSE_READDIRPLUS_AUTO)
895 fc->readdirplus_auto = 1;
896 }
Miklos Szeredi60b9df72013-05-01 14:37:21 +0200897 if (arg->flags & FUSE_ASYNC_DIO)
898 fc->async_dio = 1;
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400899 if (arg->flags & FUSE_WRITEBACK_CACHE)
900 fc->writeback_cache = 1;
Miklos Szeredie27c9d32014-04-28 14:19:23 +0200901 if (arg->time_gran && arg->time_gran <= 1000000000)
902 fc->sb->s_time_gran = arg->time_gran;
Miklos Szeredi71421252006-06-25 05:48:52 -0700903 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800904 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700905 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200906 fc->no_flock = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700907 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800908
909 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800910 fc->minor = arg->minor;
911 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200912 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800913 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800914 }
Miklos Szeredi9759bd512015-01-06 10:45:35 +0100915 fuse_set_initialized(fc);
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700916 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800917}
918
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700919static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800920{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800921 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800922
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800923 arg->major = FUSE_KERNEL_VERSION;
924 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800925 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700926 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200927 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
Miklos Szeredi69fe05c2012-07-18 16:09:40 +0200928 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
Anand V. Avati0b05b182012-08-19 08:53:23 -0400929 FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400930 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
Andrew Gallagherd7afaec2014-07-22 16:37:43 +0200931 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800932 req->in.h.opcode = FUSE_INIT;
933 req->in.numargs = 1;
934 req->in.args[0].size = sizeof(*arg);
935 req->in.args[0].value = arg;
936 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800937 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800938 with interface version < 7.5. Rest of init_out is zeroed
939 by do_get_request(), so a short reply is not a problem */
940 req->out.argvar = 1;
941 req->out.args[0].size = sizeof(struct fuse_init_out);
942 req->out.args[0].value = &req->misc.init_out;
943 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100944 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800945}
946
Tejun Heo43901aa2008-11-26 12:03:56 +0100947static void fuse_free_conn(struct fuse_conn *fc)
948{
Miklos Szeredicc080e92015-07-01 16:26:08 +0200949 WARN_ON(!list_empty(&fc->devices));
Al Virodd3e2c52013-10-03 21:21:39 -0400950 kfree_rcu(fc, rcu);
Tejun Heo43901aa2008-11-26 12:03:56 +0100951}
952
Tejun Heoa325f9b2009-04-14 10:54:52 +0900953static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
954{
955 int err;
956
Jens Axboed9938312009-06-12 14:45:52 +0200957 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900958 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900959 /* fuse does it's own writeback accounting */
Maxim Patlasov5a537482013-09-11 14:22:46 -0700960 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900961
962 err = bdi_init(&fc->bdi);
963 if (err)
964 return err;
965
966 fc->bdi_initialized = 1;
967
968 if (sb->s_bdev) {
969 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
970 MAJOR(fc->dev), MINOR(fc->dev));
971 } else {
972 err = bdi_register_dev(&fc->bdi, fc->dev);
973 }
974
975 if (err)
976 return err;
977
978 /*
979 * For a single fuse filesystem use max 1% of dirty +
980 * writeback threshold.
981 *
982 * This gives about 1M of write buffer for memory maps on a
983 * machine with 1G and 10% dirty_ratio, which should be more
984 * than enough.
985 *
986 * Privileged users can raise it by writing to
987 *
988 * /sys/class/bdi/<bdi>/max_ratio
989 */
990 bdi_set_max_ratio(&fc->bdi, 1);
991
992 return 0;
993}
994
Miklos Szeredicc080e92015-07-01 16:26:08 +0200995struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc)
996{
997 struct fuse_dev *fud;
998
999 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL);
1000 if (fud) {
1001 fud->fc = fuse_conn_get(fc);
Miklos Szeredic36960462015-07-01 16:26:09 +02001002 fuse_pqueue_init(&fud->pq);
Miklos Szeredicc080e92015-07-01 16:26:08 +02001003
1004 spin_lock(&fc->lock);
1005 list_add_tail(&fud->entry, &fc->devices);
1006 spin_unlock(&fc->lock);
1007 }
1008
1009 return fud;
1010}
1011EXPORT_SYMBOL_GPL(fuse_dev_alloc);
1012
1013void fuse_dev_free(struct fuse_dev *fud)
1014{
1015 struct fuse_conn *fc = fud->fc;
1016
1017 if (fc) {
1018 spin_lock(&fc->lock);
1019 list_del(&fud->entry);
1020 spin_unlock(&fc->lock);
1021
1022 fuse_conn_put(fc);
1023 }
1024 kfree(fud);
1025}
1026EXPORT_SYMBOL_GPL(fuse_dev_free);
1027
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001028static int fuse_fill_super(struct super_block *sb, void *data, int silent)
1029{
Miklos Szeredicc080e92015-07-01 16:26:08 +02001030 struct fuse_dev *fud;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001031 struct fuse_conn *fc;
1032 struct inode *root;
1033 struct fuse_mount_data d;
1034 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -08001035 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001036 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001037 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -08001038 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001039
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001040 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -07001041 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001042 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -07001043
Miklos Szeredi4ace1f82014-04-28 14:19:25 +02001044 sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION);
Al Viro9e1f1de2011-06-03 18:24:58 -04001045
Himangi Saraogi7b3d8bf2014-06-26 23:06:52 +05301046 if (!parse_fuse_opt(data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001047 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001048
Miklos Szeredid8091612006-12-06 20:35:48 -08001049 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001050#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001051 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -08001052 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001053 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001054#endif
Miklos Szeredid8091612006-12-06 20:35:48 -08001055 } else {
1056 sb->s_blocksize = PAGE_CACHE_SIZE;
1057 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1058 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001059 sb->s_magic = FUSE_SUPER_MAGIC;
1060 sb->s_op = &fuse_super_operations;
1061 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredi0a2da9b2012-04-11 11:45:06 +02001062 sb->s_time_gran = 1;
Miklos Szeredidbd561d2008-07-25 01:49:00 -07001063 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001064
1065 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001066 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001067 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001068 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001069
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001070 if ((file->f_op != &fuse_dev_operations) ||
1071 (file->f_cred->user_ns != &init_user_ns))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001072 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -07001073
Tejun Heo0d179aa2008-11-26 12:03:55 +01001074 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001075 err = -ENOMEM;
1076 if (!fc)
1077 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001078
Tejun Heoa325f9b2009-04-14 10:54:52 +09001079 fuse_conn_init(fc);
Miklos Szeredi0ad0b322015-07-01 16:25:55 +02001080 fc->release = fuse_free_conn;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001081
Miklos Szeredicc080e92015-07-01 16:26:08 +02001082 fud = fuse_dev_alloc(fc);
1083 if (!fud)
1084 goto err_put_conn;
1085
Tejun Heoa325f9b2009-04-14 10:54:52 +09001086 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -04001087 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001088 err = fuse_bdi_init(fc, sb);
1089 if (err)
Miklos Szeredicc080e92015-07-01 16:26:08 +02001090 goto err_dev_free;
Tejun Heo0d179aa2008-11-26 12:03:55 +01001091
Jens Axboe32a88aa2009-09-16 15:02:33 +02001092 sb->s_bdi = &fc->bdi;
1093
Miklos Szeredie0a43dd2009-06-30 20:12:23 +02001094 /* Handle umasking inside the fuse code */
1095 if (sb->s_flags & MS_POSIXACL)
1096 fc->dont_mask = 1;
1097 sb->s_flags |= MS_POSIXACL;
1098
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001099 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001100 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001101 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +02001102 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001103
Miklos Szeredif543f252006-01-16 22:14:35 -08001104 /* Used by get_root_inode() */
1105 sb->s_fs_info = fc;
1106
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001107 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +01001108 root = fuse_get_root_inode(sb, d.rootmode);
Al Viro48fde702012-01-08 22:15:13 -05001109 root_dentry = d_make_root(root);
1110 if (!root_dentry)
Miklos Szeredicc080e92015-07-01 16:26:08 +02001111 goto err_dev_free;
Al Viroc35eebe2010-12-18 11:15:22 -05001112 /* only now - we want root dentry with NULL ->d_op */
1113 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -08001114
Maxim Patlasov4250c062012-10-26 19:48:07 +04001115 init_req = fuse_request_alloc(0);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001116 if (!init_req)
1117 goto err_put_root;
Miklos Szeredi825d6d32015-07-01 16:25:58 +02001118 __set_bit(FR_BACKGROUND, &init_req->flags);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001119
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001120 if (is_bdev) {
Maxim Patlasov4250c062012-10-26 19:48:07 +04001121 fc->destroy_req = fuse_request_alloc(0);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001122 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001123 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001124 }
1125
Miklos Szeredibafa9652006-06-25 05:48:51 -07001126 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001127 err = -EINVAL;
1128 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001129 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001130
Miklos Szeredibafa9652006-06-25 05:48:51 -07001131 err = fuse_ctl_add_conn(fc);
1132 if (err)
1133 goto err_unlock;
1134
1135 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001136 sb->s_root = root_dentry;
Miklos Szeredicc080e92015-07-01 16:26:08 +02001137 file->private_data = fud;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001138 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001139 /*
1140 * atomic_dec_and_test() in fput() provides the necessary
1141 * memory barrier for file->private_data to be visible on all
1142 * CPUs after this
1143 */
1144 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001145
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001146 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001147
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001148 return 0;
1149
Miklos Szeredibafa9652006-06-25 05:48:51 -07001150 err_unlock:
1151 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001152 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001153 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001154 err_put_root:
1155 dput(root_dentry);
Miklos Szeredicc080e92015-07-01 16:26:08 +02001156 err_dev_free:
1157 fuse_dev_free(fud);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001158 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001159 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001160 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001161 err_fput:
1162 fput(file);
1163 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001164 return err;
1165}
1166
Al Viro3c26ff62010-07-25 11:46:36 +04001167static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001168 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001169 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001170{
Al Viro3c26ff62010-07-25 11:46:36 +04001171 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001172}
1173
John Muir3b463ae2009-05-31 11:13:57 -04001174static void fuse_kill_sb_anon(struct super_block *sb)
1175{
1176 struct fuse_conn *fc = get_fuse_conn_super(sb);
1177
1178 if (fc) {
1179 down_write(&fc->killsb);
1180 fc->sb = NULL;
1181 up_write(&fc->killsb);
1182 }
1183
1184 kill_anon_super(sb);
1185}
1186
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001187static struct file_system_type fuse_fs_type = {
1188 .owner = THIS_MODULE,
1189 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001190 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001191 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001192 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001193};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001194MODULE_ALIAS_FS("fuse");
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001195
1196#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001197static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001198 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001199 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001200{
Al Viro152a0832010-07-25 00:46:55 +04001201 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001202}
1203
John Muir3b463ae2009-05-31 11:13:57 -04001204static void fuse_kill_sb_blk(struct super_block *sb)
1205{
1206 struct fuse_conn *fc = get_fuse_conn_super(sb);
1207
1208 if (fc) {
1209 down_write(&fc->killsb);
1210 fc->sb = NULL;
1211 up_write(&fc->killsb);
1212 }
1213
1214 kill_block_super(sb);
1215}
1216
Miklos Szeredid6392f82006-12-06 20:35:44 -08001217static struct file_system_type fuseblk_fs_type = {
1218 .owner = THIS_MODULE,
1219 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001220 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001221 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001222 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001223};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001224MODULE_ALIAS_FS("fuseblk");
Miklos Szeredid6392f82006-12-06 20:35:44 -08001225
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001226static inline int register_fuseblk(void)
1227{
1228 return register_filesystem(&fuseblk_fs_type);
1229}
1230
1231static inline void unregister_fuseblk(void)
1232{
1233 unregister_filesystem(&fuseblk_fs_type);
1234}
1235#else
1236static inline int register_fuseblk(void)
1237{
1238 return 0;
1239}
1240
1241static inline void unregister_fuseblk(void)
1242{
1243}
1244#endif
1245
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001246static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001247{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001248 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001249
Christoph Lametera35afb82007-05-16 22:10:57 -07001250 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001251}
1252
1253static int __init fuse_fs_init(void)
1254{
1255 int err;
1256
Miklos Szeredid6392f82006-12-06 20:35:44 -08001257 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1258 sizeof(struct fuse_inode),
1259 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001260 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001261 err = -ENOMEM;
1262 if (!fuse_inode_cachep)
Al Viro988f0322011-12-13 12:25:27 -05001263 goto out;
1264
1265 err = register_fuseblk();
1266 if (err)
1267 goto out2;
1268
1269 err = register_filesystem(&fuse_fs_type);
1270 if (err)
1271 goto out3;
Miklos Szeredid6392f82006-12-06 20:35:44 -08001272
1273 return 0;
1274
Al Viro988f0322011-12-13 12:25:27 -05001275 out3:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001276 unregister_fuseblk();
Al Viro988f0322011-12-13 12:25:27 -05001277 out2:
1278 kmem_cache_destroy(fuse_inode_cachep);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001279 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001280 return err;
1281}
1282
1283static void fuse_fs_cleanup(void)
1284{
1285 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001286 unregister_fuseblk();
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001287
1288 /*
1289 * Make sure all delayed rcu free inodes are flushed before we
1290 * destroy cache.
1291 */
1292 rcu_barrier();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001293 kmem_cache_destroy(fuse_inode_cachep);
1294}
1295
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001296static struct kobject *fuse_kobj;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001297
Miklos Szeredif543f252006-01-16 22:14:35 -08001298static int fuse_sysfs_init(void)
1299{
1300 int err;
1301
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001302 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001303 if (!fuse_kobj) {
1304 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001305 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001306 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001307
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001308 err = sysfs_create_mount_point(fuse_kobj, "connections");
1309 if (err)
Miklos Szeredif543f252006-01-16 22:14:35 -08001310 goto out_fuse_unregister;
1311
1312 return 0;
1313
1314 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001315 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001316 out_err:
1317 return err;
1318}
1319
1320static void fuse_sysfs_cleanup(void)
1321{
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001322 sysfs_remove_mount_point(fuse_kobj, "connections");
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001323 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001324}
1325
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001326static int __init fuse_init(void)
1327{
1328 int res;
1329
Miklos Szeredi1729a162008-11-26 12:03:54 +01001330 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001331 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1332
Miklos Szeredibafa9652006-06-25 05:48:51 -07001333 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001334 res = fuse_fs_init();
1335 if (res)
1336 goto err;
1337
Miklos Szeredi334f4852005-09-09 13:10:27 -07001338 res = fuse_dev_init();
1339 if (res)
1340 goto err_fs_cleanup;
1341
Miklos Szeredif543f252006-01-16 22:14:35 -08001342 res = fuse_sysfs_init();
1343 if (res)
1344 goto err_dev_cleanup;
1345
Miklos Szeredibafa9652006-06-25 05:48:51 -07001346 res = fuse_ctl_init();
1347 if (res)
1348 goto err_sysfs_cleanup;
1349
Csaba Henk487ea5a2009-08-26 19:17:22 +02001350 sanitize_global_limit(&max_user_bgreq);
1351 sanitize_global_limit(&max_user_congthresh);
1352
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001353 return 0;
1354
Miklos Szeredibafa9652006-06-25 05:48:51 -07001355 err_sysfs_cleanup:
1356 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001357 err_dev_cleanup:
1358 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001359 err_fs_cleanup:
1360 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001361 err:
1362 return res;
1363}
1364
1365static void __exit fuse_exit(void)
1366{
1367 printk(KERN_DEBUG "fuse exit\n");
1368
Miklos Szeredibafa9652006-06-25 05:48:51 -07001369 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001370 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001371 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001372 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001373}
1374
1375module_init(fuse_init);
1376module_exit(fuse_exit);