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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>
Seth Forshee60bcc882016-08-29 08:46:37 -050023#include <linux/posix_acl.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070024
25MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
26MODULE_DESCRIPTION("Filesystem in Userspace");
27MODULE_LICENSE("GPL");
28
Christoph Lametere18b8902006-12-06 20:33:20 -080029static struct kmem_cache *fuse_inode_cachep;
Miklos Szeredibafa9652006-06-25 05:48:51 -070030struct list_head fuse_conn_list;
31DEFINE_MUTEX(fuse_mutex);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070032
Csaba Henk487ea5a2009-08-26 19:17:22 +020033static int set_global_limit(const char *val, struct kernel_param *kp);
34
Csaba Henk79a9d992009-08-26 19:18:24 +020035unsigned max_user_bgreq;
Csaba Henk487ea5a2009-08-26 19:17:22 +020036module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
37 &max_user_bgreq, 0644);
38__MODULE_PARM_TYPE(max_user_bgreq, "uint");
39MODULE_PARM_DESC(max_user_bgreq,
40 "Global limit for the maximum number of backgrounded requests an "
41 "unprivileged user can set");
42
Csaba Henk79a9d992009-08-26 19:18:24 +020043unsigned max_user_congthresh;
Csaba Henk487ea5a2009-08-26 19:17:22 +020044module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
45 &max_user_congthresh, 0644);
46__MODULE_PARM_TYPE(max_user_congthresh, "uint");
47MODULE_PARM_DESC(max_user_congthresh,
48 "Global limit for the maximum congestion threshold an "
49 "unprivileged user can set");
50
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070051#define FUSE_SUPER_MAGIC 0x65735546
52
Miklos Szeredid1875db2008-02-08 04:21:43 -080053#define FUSE_DEFAULT_BLKSIZE 512
54
Csaba Henk7a6d3c82009-07-01 17:28:41 -070055/** Maximum number of outstanding background requests */
56#define FUSE_DEFAULT_MAX_BACKGROUND 12
57
58/** Congestion starts at 75% of maximum */
59#define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)
60
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070061struct fuse_mount_data {
62 int fd;
63 unsigned rootmode;
Eric W. Biederman499dcf22012-02-07 16:26:03 -080064 kuid_t user_id;
65 kgid_t group_id;
Miklos Szeredi1729a162008-11-26 12:03:54 +010066 unsigned fd_present:1;
67 unsigned rootmode_present:1;
68 unsigned user_id_present:1;
69 unsigned group_id_present:1;
Miklos Szeredi29433a22016-10-01 07:32:32 +020070 unsigned default_permissions:1;
71 unsigned allow_other:1;
Miklos Szeredidb50b962005-09-09 13:10:33 -070072 unsigned max_read;
Miklos Szeredid8091612006-12-06 20:35:48 -080073 unsigned blksize;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070074};
75
Randy Dunlapa2daff62011-05-31 14:09:00 -070076struct fuse_forget_link *fuse_alloc_forget(void)
Miklos Szeredi07e77dc2010-12-07 20:16:56 +010077{
78 return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
79}
80
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070081static struct inode *fuse_alloc_inode(struct super_block *sb)
82{
83 struct inode *inode;
84 struct fuse_inode *fi;
85
Christoph Lametere94b1762006-12-06 20:33:17 -080086 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070087 if (!inode)
88 return NULL;
89
90 fi = get_fuse_inode(inode);
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070091 fi->i_time = 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070092 fi->nodeid = 0;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070093 fi->nlookup = 0;
John Muirfbee36b2007-11-28 16:22:02 -080094 fi->attr_version = 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -070095 fi->writectr = 0;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +040096 fi->orig_ino = 0;
Feng Shuo4582a4a2013-01-15 11:23:28 +080097 fi->state = 0;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070098 INIT_LIST_HEAD(&fi->write_files);
Miklos Szeredi3be5a522008-04-30 00:54:41 -070099 INIT_LIST_HEAD(&fi->queued_writes);
100 INIT_LIST_HEAD(&fi->writepages);
101 init_waitqueue_head(&fi->page_waitq);
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200102 mutex_init(&fi->mutex);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100103 fi->forget = fuse_alloc_forget();
104 if (!fi->forget) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700105 kmem_cache_free(fuse_inode_cachep, inode);
106 return NULL;
107 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700108
109 return inode;
110}
111
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100112static void fuse_i_callback(struct rcu_head *head)
113{
114 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100115 kmem_cache_free(fuse_inode_cachep, inode);
116}
117
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700118static void fuse_destroy_inode(struct inode *inode)
119{
Miklos Szeredie5e55582005-09-09 13:10:28 -0700120 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700121 BUG_ON(!list_empty(&fi->write_files));
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700122 BUG_ON(!list_empty(&fi->queued_writes));
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200123 mutex_destroy(&fi->mutex);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100124 kfree(fi->forget);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100125 call_rcu(&inode->i_rcu, fuse_i_callback);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700126}
127
Al Virob57922d2010-06-07 14:34:48 -0400128static void fuse_evict_inode(struct inode *inode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700129{
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700130 truncate_inode_pages_final(&inode->i_data);
Jan Karadbd57682012-05-03 14:48:02 +0200131 clear_inode(inode);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700132 if (inode->i_sb->s_flags & MS_ACTIVE) {
133 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700134 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100135 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
136 fi->forget = NULL;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700137 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700138}
139
Miklos Szeredi71421252006-06-25 05:48:52 -0700140static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
141{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400142 sync_filesystem(sb);
Miklos Szeredi71421252006-06-25 05:48:52 -0700143 if (*flags & MS_MANDLOCK)
144 return -EINVAL;
145
146 return 0;
147}
148
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400149/*
150 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
151 * so that it will fit.
152 */
153static ino_t fuse_squash_ino(u64 ino64)
154{
155 ino_t ino = (ino_t) ino64;
156 if (sizeof(ino_t) < sizeof(u64))
157 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8;
158 return ino;
159}
160
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700161void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
162 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700163{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700164 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700165 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700166
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700167 fi->attr_version = ++fc->attr_version;
168 fi->i_time = attr_valid;
169
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400170 inode->i_ino = fuse_squash_ino(attr->ino);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700171 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200172 set_nlink(inode, attr->nlink);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800173 inode->i_uid = make_kuid(&init_user_ns, attr->uid);
174 inode->i_gid = make_kgid(&init_user_ns, attr->gid);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700175 inode->i_blocks = attr->blocks;
176 inode->i_atime.tv_sec = attr->atime;
177 inode->i_atime.tv_nsec = attr->atimensec;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400178 /* mtime from server may be stale due to local buffered write */
179 if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) {
180 inode->i_mtime.tv_sec = attr->mtime;
181 inode->i_mtime.tv_nsec = attr->mtimensec;
Maxim Patlasov31f32672014-04-28 14:19:24 +0200182 inode->i_ctime.tv_sec = attr->ctime;
183 inode->i_ctime.tv_nsec = attr->ctimensec;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400184 }
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700185
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700186 if (attr->blksize != 0)
187 inode->i_blkbits = ilog2(attr->blksize);
188 else
189 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
190
Miklos Szerediebc14c42007-10-16 23:31:03 -0700191 /*
192 * Don't set the sticky bit in i_mode, unless we want the VFS
193 * to check permissions. This prevents failures due to the
194 * check in may_delete().
195 */
196 fi->orig_i_mode = inode->i_mode;
Miklos Szeredi29433a22016-10-01 07:32:32 +0200197 if (!fc->default_permissions)
Miklos Szerediebc14c42007-10-16 23:31:03 -0700198 inode->i_mode &= ~S_ISVTX;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400199
200 fi->orig_ino = attr->ino;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700201}
202
203void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
204 u64 attr_valid, u64 attr_version)
205{
206 struct fuse_conn *fc = get_fuse_conn(inode);
207 struct fuse_inode *fi = get_fuse_inode(inode);
Pavel Emelyanov83732002013-10-10 17:10:46 +0400208 bool is_wb = fc->writeback_cache;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700209 loff_t oldsize;
Brian Fostereed21792012-07-16 15:23:49 -0400210 struct timespec old_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700211
212 spin_lock(&fc->lock);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +0400213 if ((attr_version != 0 && fi->attr_version > attr_version) ||
214 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700215 spin_unlock(&fc->lock);
216 return;
217 }
218
Brian Fostereed21792012-07-16 15:23:49 -0400219 old_mtime = inode->i_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700220 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700221
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700222 oldsize = inode->i_size;
Pavel Emelyanov83732002013-10-10 17:10:46 +0400223 /*
224 * In case of writeback_cache enabled, the cached writes beyond EOF
225 * extend local i_size without keeping userspace server in sync. So,
226 * attr->size coming from server can be stale. We cannot trust it.
227 */
228 if (!is_wb || !S_ISREG(inode->i_mode))
229 i_size_write(inode, attr->size);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700230 spin_unlock(&fc->lock);
231
Pavel Emelyanov83732002013-10-10 17:10:46 +0400232 if (!is_wb && S_ISREG(inode->i_mode)) {
Brian Fostereed21792012-07-16 15:23:49 -0400233 bool inval = false;
234
235 if (oldsize != attr->size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700236 truncate_pagecache(inode, attr->size);
Brian Fostereed21792012-07-16 15:23:49 -0400237 inval = true;
238 } else if (fc->auto_inval_data) {
239 struct timespec new_mtime = {
240 .tv_sec = attr->mtime,
241 .tv_nsec = attr->mtimensec,
242 };
243
244 /*
245 * Auto inval mode also checks and invalidates if mtime
246 * has changed.
247 */
248 if (!timespec_equal(&old_mtime, &new_mtime))
249 inval = true;
250 }
251
252 if (inval)
253 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700254 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700255}
256
257static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
258{
259 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700260 inode->i_size = attr->size;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400261 inode->i_mtime.tv_sec = attr->mtime;
262 inode->i_mtime.tv_nsec = attr->mtimensec;
Maxim Patlasov31f32672014-04-28 14:19:24 +0200263 inode->i_ctime.tv_sec = attr->ctime;
264 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700265 if (S_ISREG(inode->i_mode)) {
266 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700267 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700268 } else if (S_ISDIR(inode->i_mode))
269 fuse_init_dir(inode);
270 else if (S_ISLNK(inode->i_mode))
271 fuse_init_symlink(inode);
272 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
273 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
274 fuse_init_common(inode);
275 init_special_inode(inode, inode->i_mode,
276 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800277 } else
278 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700279}
280
John Muir3b463ae2009-05-31 11:13:57 -0400281int fuse_inode_eq(struct inode *inode, void *_nodeidp)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700282{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700283 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700284 if (get_node_id(inode) == nodeid)
285 return 1;
286 else
287 return 0;
288}
289
290static int fuse_inode_set(struct inode *inode, void *_nodeidp)
291{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700292 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700293 get_fuse_inode(inode)->nodeid = nodeid;
294 return 0;
295}
296
Miklos Szeredib48badf2008-04-30 00:54:44 -0700297struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700298 int generation, struct fuse_attr *attr,
299 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700300{
301 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700302 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700303 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700304
305 retry:
306 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
307 if (!inode)
308 return NULL;
309
310 if ((inode->i_state & I_NEW)) {
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400311 inode->i_flags |= S_NOATIME;
Maxim Patlasovd31433c2014-04-28 14:19:21 +0200312 if (!fc->writeback_cache || !S_ISREG(attr->mode))
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400313 inode->i_flags |= S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700314 inode->i_generation = generation;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700315 fuse_init_inode(inode, attr);
316 unlock_new_inode(inode);
317 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700318 /* Inode has changed type, any I/O on the old should fail */
319 make_bad_inode(inode);
320 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700321 goto retry;
322 }
323
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700324 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700325 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100326 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700327 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700328 fuse_change_attributes(inode, attr, attr_valid, attr_version);
329
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700330 return inode;
331}
332
John Muir3b463ae2009-05-31 11:13:57 -0400333int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
334 loff_t offset, loff_t len)
335{
336 struct inode *inode;
337 pgoff_t pg_start;
338 pgoff_t pg_end;
339
340 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
341 if (!inode)
342 return -ENOENT;
343
344 fuse_invalidate_attr(inode);
Seth Forshee60bcc882016-08-29 08:46:37 -0500345 forget_all_cached_acls(inode);
John Muir3b463ae2009-05-31 11:13:57 -0400346 if (offset >= 0) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300347 pg_start = offset >> PAGE_SHIFT;
John Muir3b463ae2009-05-31 11:13:57 -0400348 if (len <= 0)
349 pg_end = -1;
350 else
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300351 pg_end = (offset + len - 1) >> PAGE_SHIFT;
John Muir3b463ae2009-05-31 11:13:57 -0400352 invalidate_inode_pages2_range(inode->i_mapping,
353 pg_start, pg_end);
354 }
355 iput(inode);
356 return 0;
357}
358
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200359void fuse_lock_inode(struct inode *inode)
360{
361 if (!get_fuse_conn(inode)->parallel_dirops)
362 mutex_lock(&get_fuse_inode(inode)->mutex);
363}
364
365void fuse_unlock_inode(struct inode *inode)
366{
367 if (!get_fuse_conn(inode)->parallel_dirops)
368 mutex_unlock(&get_fuse_inode(inode)->mutex);
369}
370
Al Viro42faad92008-04-24 07:21:56 -0400371static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800372{
Al Viro42faad92008-04-24 07:21:56 -0400373 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800374}
375
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800376static void fuse_send_destroy(struct fuse_conn *fc)
377{
378 struct fuse_req *req = fc->destroy_req;
379 if (req && fc->conn_init) {
380 fc->destroy_req = NULL;
381 req->in.h.opcode = FUSE_DESTROY;
Miklos Szeredi825d6d32015-07-01 16:25:58 +0200382 __set_bit(FR_FORCE, &req->flags);
383 __clear_bit(FR_BACKGROUND, &req->flags);
Tejun Heob93f8582008-11-26 12:03:55 +0100384 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800385 fuse_put_request(fc, req);
386 }
387}
388
Tejun Heoa325f9b2009-04-14 10:54:52 +0900389static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700390{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900391 if (fc->bdi_initialized)
392 bdi_destroy(&fc->bdi);
393}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700394
Tejun Heoa325f9b2009-04-14 10:54:52 +0900395static void fuse_put_super(struct super_block *sb)
396{
397 struct fuse_conn *fc = get_fuse_conn_super(sb);
398
399 fuse_send_destroy(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200400
Miklos Szeredi580640b2014-12-12 09:49:04 +0100401 fuse_abort_conn(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200402 mutex_lock(&fuse_mutex);
403 list_del(&fc->entry);
404 fuse_ctl_remove_conn(fc);
405 mutex_unlock(&fuse_mutex);
406 fuse_bdi_destroy(fc);
407
Miklos Szeredibafa9652006-06-25 05:48:51 -0700408 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700409}
410
Miklos Szeredie5e55582005-09-09 13:10:28 -0700411static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
412{
413 stbuf->f_type = FUSE_SUPER_MAGIC;
414 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800415 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700416 stbuf->f_blocks = attr->blocks;
417 stbuf->f_bfree = attr->bfree;
418 stbuf->f_bavail = attr->bavail;
419 stbuf->f_files = attr->files;
420 stbuf->f_ffree = attr->ffree;
421 stbuf->f_namelen = attr->namelen;
422 /* fsid is left zero */
423}
424
David Howells726c3342006-06-23 02:02:58 -0700425static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700426{
David Howells726c3342006-06-23 02:02:58 -0700427 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700428 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredi70781872014-12-12 09:49:05 +0100429 FUSE_ARGS(args);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700430 struct fuse_statfs_out outarg;
431 int err;
432
Anatol Pomozovc2132c12013-01-14 22:30:00 -0800433 if (!fuse_allow_current_process(fc)) {
Miklos Szeredie57ac682007-10-18 03:06:58 -0700434 buf->f_type = FUSE_SUPER_MAGIC;
435 return 0;
436 }
437
Miklos Szeredide5f1202006-01-06 00:19:37 -0800438 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredi70781872014-12-12 09:49:05 +0100439 args.in.numargs = 0;
440 args.in.h.opcode = FUSE_STATFS;
David Howells2b0143b2015-03-17 22:25:59 +0000441 args.in.h.nodeid = get_node_id(d_inode(dentry));
Miklos Szeredi70781872014-12-12 09:49:05 +0100442 args.out.numargs = 1;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100443 args.out.args[0].size = sizeof(outarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100444 args.out.args[0].value = &outarg;
445 err = fuse_simple_request(fc, &args);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700446 if (!err)
447 convert_fuse_statfs(buf, &outarg.st);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700448 return err;
449}
450
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700451enum {
452 OPT_FD,
453 OPT_ROOTMODE,
454 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700455 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700456 OPT_DEFAULT_PERMISSIONS,
457 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700458 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800459 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700460 OPT_ERR
461};
462
Steven Whitehousea447c092008-10-13 10:46:57 +0100463static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700464 {OPT_FD, "fd=%u"},
465 {OPT_ROOTMODE, "rootmode=%o"},
466 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700467 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700468 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
469 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700470 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800471 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700472 {OPT_ERR, NULL}
473};
474
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200475static int fuse_match_uint(substring_t *s, unsigned int *res)
476{
477 int err = -ENOMEM;
478 char *buf = match_strdup(s);
479 if (buf) {
480 err = kstrtouint(buf, 10, res);
481 kfree(buf);
482 }
483 return err;
484}
485
Miklos Szeredid8091612006-12-06 20:35:48 -0800486static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700487{
488 char *p;
489 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700490 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800491 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700492
493 while ((p = strsep(&opt, ",")) != NULL) {
494 int token;
495 int value;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200496 unsigned uv;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700497 substring_t args[MAX_OPT_ARGS];
498 if (!*p)
499 continue;
500
501 token = match_token(p, tokens, args);
502 switch (token) {
503 case OPT_FD:
504 if (match_int(&args[0], &value))
505 return 0;
506 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700507 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700508 break;
509
510 case OPT_ROOTMODE:
511 if (match_octal(&args[0], &value))
512 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700513 if (!fuse_valid_type(value))
514 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700515 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700516 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700517 break;
518
519 case OPT_USER_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200520 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700521 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200522 d->user_id = make_kuid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800523 if (!uid_valid(d->user_id))
524 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700525 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700526 break;
527
Miklos Szeredi87729a52005-09-09 13:10:34 -0700528 case OPT_GROUP_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200529 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredi87729a52005-09-09 13:10:34 -0700530 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200531 d->group_id = make_kgid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800532 if (!gid_valid(d->group_id))
533 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700534 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700535 break;
536
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700537 case OPT_DEFAULT_PERMISSIONS:
Miklos Szeredi29433a22016-10-01 07:32:32 +0200538 d->default_permissions = 1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700539 break;
540
541 case OPT_ALLOW_OTHER:
Miklos Szeredi29433a22016-10-01 07:32:32 +0200542 d->allow_other = 1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700543 break;
544
Miklos Szeredidb50b962005-09-09 13:10:33 -0700545 case OPT_MAX_READ:
546 if (match_int(&args[0], &value))
547 return 0;
548 d->max_read = value;
549 break;
550
Miklos Szeredid8091612006-12-06 20:35:48 -0800551 case OPT_BLKSIZE:
552 if (!is_bdev || match_int(&args[0], &value))
553 return 0;
554 d->blksize = value;
555 break;
556
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700557 default:
558 return 0;
559 }
560 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700561
562 if (!d->fd_present || !d->rootmode_present ||
563 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700564 return 0;
565
566 return 1;
567}
568
Al Viro34c80b12011-12-08 21:32:45 -0500569static int fuse_show_options(struct seq_file *m, struct dentry *root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700570{
Al Viro34c80b12011-12-08 21:32:45 -0500571 struct super_block *sb = root->d_sb;
572 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700573
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800574 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id));
575 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id));
Miklos Szeredi29433a22016-10-01 07:32:32 +0200576 if (fc->default_permissions)
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700577 seq_puts(m, ",default_permissions");
Miklos Szeredi29433a22016-10-01 07:32:32 +0200578 if (fc->allow_other)
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700579 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700580 if (fc->max_read != ~0)
581 seq_printf(m, ",max_read=%u", fc->max_read);
Al Viro34c80b12011-12-08 21:32:45 -0500582 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
583 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700584 return 0;
585}
586
Miklos Szeredif88996a2015-07-01 16:26:01 +0200587static void fuse_iqueue_init(struct fuse_iqueue *fiq)
588{
589 memset(fiq, 0, sizeof(struct fuse_iqueue));
590 init_waitqueue_head(&fiq->waitq);
591 INIT_LIST_HEAD(&fiq->pending);
592 INIT_LIST_HEAD(&fiq->interrupts);
593 fiq->forget_list_tail = &fiq->forget_list_head;
Miklos Szeredie16714d2015-07-01 16:26:01 +0200594 fiq->connected = 1;
Miklos Szeredif88996a2015-07-01 16:26:01 +0200595}
596
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200597static void fuse_pqueue_init(struct fuse_pqueue *fpq)
598{
599 memset(fpq, 0, sizeof(struct fuse_pqueue));
Miklos Szeredi45a91cb2015-07-01 16:26:06 +0200600 spin_lock_init(&fpq->lock);
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200601 INIT_LIST_HEAD(&fpq->processing);
602 INIT_LIST_HEAD(&fpq->io);
Miklos Szeredie96edd92015-07-01 16:26:04 +0200603 fpq->connected = 1;
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200604}
605
Tejun Heoa325f9b2009-04-14 10:54:52 +0900606void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700607{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100608 memset(fc, 0, sizeof(*fc));
609 spin_lock_init(&fc->lock);
John Muir3b463ae2009-05-31 11:13:57 -0400610 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100611 atomic_set(&fc->count, 1);
Miklos Szeredic36960462015-07-01 16:26:09 +0200612 atomic_set(&fc->dev_count, 1);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100613 init_waitqueue_head(&fc->blocked_waitq);
614 init_waitqueue_head(&fc->reserved_req_waitq);
Miklos Szeredif88996a2015-07-01 16:26:01 +0200615 fuse_iqueue_init(&fc->iq);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100616 INIT_LIST_HEAD(&fc->bg_queue);
617 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredicc080e92015-07-01 16:26:08 +0200618 INIT_LIST_HEAD(&fc->devices);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100619 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700620 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
621 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100622 fc->khctr = 0;
623 fc->polled_files = RB_ROOT;
Maxim Patlasov0aada882013-03-21 18:02:28 +0400624 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400625 fc->initialized = 0;
Miklos Szeredie16714d2015-07-01 16:26:01 +0200626 fc->connected = 1;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100627 fc->attr_version = 1;
628 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700629}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100630EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700631
Miklos Szeredibafa9652006-06-25 05:48:51 -0700632void fuse_conn_put(struct fuse_conn *fc)
633{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700634 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800635 if (fc->destroy_req)
636 fuse_request_free(fc->destroy_req);
Tejun Heo43901aa2008-11-26 12:03:56 +0100637 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700638 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700639}
Tejun Heo08cbf542009-04-14 10:54:53 +0900640EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700641
642struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
643{
644 atomic_inc(&fc->count);
645 return fc;
646}
Tejun Heo08cbf542009-04-14 10:54:53 +0900647EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700648
Tejun Heob93f8582008-11-26 12:03:55 +0100649static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700650{
651 struct fuse_attr attr;
652 memset(&attr, 0, sizeof(attr));
653
654 attr.mode = mode;
655 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700656 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700657 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700658}
659
Miklos Szeredi1729a162008-11-26 12:03:54 +0100660struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700661 u64 nodeid;
662 u32 generation;
663};
664
665static struct dentry *fuse_get_dentry(struct super_block *sb,
666 struct fuse_inode_handle *handle)
667{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700668 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700669 struct inode *inode;
670 struct dentry *entry;
671 int err = -ESTALE;
672
673 if (handle->nodeid == 0)
674 goto out_err;
675
676 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700677 if (!inode) {
678 struct fuse_entry_out outarg;
Al Viro13983d02016-07-20 22:34:44 -0400679 const struct qstr name = QSTR_INIT(".", 1);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700680
681 if (!fc->export_support)
682 goto out_err;
683
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700684 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
685 &inode);
686 if (err && err != -ENOENT)
687 goto out_err;
688 if (err || !inode) {
689 err = -ESTALE;
690 goto out_err;
691 }
692 err = -EIO;
693 if (get_node_id(inode) != handle->nodeid)
694 goto out_iput;
695 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700696 err = -ESTALE;
697 if (inode->i_generation != handle->generation)
698 goto out_iput;
699
Christoph Hellwig44003722008-08-11 15:49:04 +0200700 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500701 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700702 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700703
704 return entry;
705
706 out_iput:
707 iput(inode);
708 out_err:
709 return ERR_PTR(err);
710}
711
Al Virob0b03822012-04-02 14:34:06 -0400712static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
713 struct inode *parent)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700714{
Al Virob0b03822012-04-02 14:34:06 -0400715 int len = parent ? 6 : 3;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700716 u64 nodeid;
717 u32 generation;
718
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530719 if (*max_len < len) {
720 *max_len = len;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900721 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530722 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700723
724 nodeid = get_fuse_inode(inode)->nodeid;
725 generation = inode->i_generation;
726
727 fh[0] = (u32)(nodeid >> 32);
728 fh[1] = (u32)(nodeid & 0xffffffff);
729 fh[2] = generation;
730
Al Virob0b03822012-04-02 14:34:06 -0400731 if (parent) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700732 nodeid = get_fuse_inode(parent)->nodeid;
733 generation = parent->i_generation;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700734
735 fh[3] = (u32)(nodeid >> 32);
736 fh[4] = (u32)(nodeid & 0xffffffff);
737 fh[5] = generation;
738 }
739
740 *max_len = len;
Al Virob0b03822012-04-02 14:34:06 -0400741 return parent ? 0x82 : 0x81;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700742}
743
744static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
745 struct fid *fid, int fh_len, int fh_type)
746{
747 struct fuse_inode_handle handle;
748
749 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
750 return NULL;
751
752 handle.nodeid = (u64) fid->raw[0] << 32;
753 handle.nodeid |= (u64) fid->raw[1];
754 handle.generation = fid->raw[2];
755 return fuse_get_dentry(sb, &handle);
756}
757
758static struct dentry *fuse_fh_to_parent(struct super_block *sb,
759 struct fid *fid, int fh_len, int fh_type)
760{
761 struct fuse_inode_handle parent;
762
763 if (fh_type != 0x82 || fh_len < 6)
764 return NULL;
765
766 parent.nodeid = (u64) fid->raw[3] << 32;
767 parent.nodeid |= (u64) fid->raw[4];
768 parent.generation = fid->raw[5];
769 return fuse_get_dentry(sb, &parent);
770}
771
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700772static struct dentry *fuse_get_parent(struct dentry *child)
773{
David Howells2b0143b2015-03-17 22:25:59 +0000774 struct inode *child_inode = d_inode(child);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700775 struct fuse_conn *fc = get_fuse_conn(child_inode);
776 struct inode *inode;
777 struct dentry *parent;
778 struct fuse_entry_out outarg;
Al Viro13983d02016-07-20 22:34:44 -0400779 const struct qstr name = QSTR_INIT("..", 2);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700780 int err;
781
782 if (!fc->export_support)
783 return ERR_PTR(-ESTALE);
784
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700785 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
786 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200787 if (err) {
788 if (err == -ENOENT)
789 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700790 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700791 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200792
793 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500794 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700795 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700796
797 return parent;
798}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700799
800static const struct export_operations fuse_export_operations = {
801 .fh_to_dentry = fuse_fh_to_dentry,
802 .fh_to_parent = fuse_fh_to_parent,
803 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700804 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700805};
806
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800807static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700808 .alloc_inode = fuse_alloc_inode,
809 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400810 .evict_inode = fuse_evict_inode,
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200811 .write_inode = fuse_write_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700812 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700813 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700814 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800815 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700816 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700817 .show_options = fuse_show_options,
818};
819
Csaba Henk487ea5a2009-08-26 19:17:22 +0200820static void sanitize_global_limit(unsigned *limit)
821{
822 if (*limit == 0)
Jiang Liu0ed5fd12013-07-03 15:03:43 -0700823 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
Csaba Henk487ea5a2009-08-26 19:17:22 +0200824 sizeof(struct fuse_req);
825
826 if (*limit >= 1 << 16)
827 *limit = (1 << 16) - 1;
828}
829
830static int set_global_limit(const char *val, struct kernel_param *kp)
831{
832 int rv;
833
834 rv = param_set_uint(val, kp);
835 if (rv)
836 return rv;
837
838 sanitize_global_limit((unsigned *)kp->arg);
839
840 return 0;
841}
842
843static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
844{
845 int cap_sys_admin = capable(CAP_SYS_ADMIN);
846
847 if (arg->minor < 13)
848 return;
849
850 sanitize_global_limit(&max_user_bgreq);
851 sanitize_global_limit(&max_user_congthresh);
852
853 if (arg->max_background) {
854 fc->max_background = arg->max_background;
855
856 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
857 fc->max_background = max_user_bgreq;
858 }
859 if (arg->congestion_threshold) {
860 fc->congestion_threshold = arg->congestion_threshold;
861
862 if (!cap_sys_admin &&
863 fc->congestion_threshold > max_user_congthresh)
864 fc->congestion_threshold = max_user_congthresh;
865 }
866}
867
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800868static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
869{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800870 struct fuse_init_out *arg = &req->misc.init_out;
871
872 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
873 fc->conn_error = 1;
874 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800875 unsigned long ra_pages;
876
Csaba Henk487ea5a2009-08-26 19:17:22 +0200877 process_init_limits(fc, arg);
878
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800879 if (arg->minor >= 6) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300880 ra_pages = arg->max_readahead / PAGE_SIZE;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800881 if (arg->flags & FUSE_ASYNC_READ)
882 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700883 if (!(arg->flags & FUSE_POSIX_LOCKS))
884 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200885 if (arg->minor >= 17) {
886 if (!(arg->flags & FUSE_FLOCK_LOCKS))
887 fc->no_flock = 1;
Miklos Szeredi24114502011-09-12 09:31:49 +0200888 } else {
889 if (!(arg->flags & FUSE_POSIX_LOCKS))
890 fc->no_flock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200891 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700892 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
893 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700894 if (arg->minor >= 9) {
895 /* LOOKUP has dependency on proto version */
896 if (arg->flags & FUSE_EXPORT_SUPPORT)
897 fc->export_support = 1;
898 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700899 if (arg->flags & FUSE_BIG_WRITES)
900 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200901 if (arg->flags & FUSE_DONT_MASK)
902 fc->dont_mask = 1;
Brian Foster72d0d242012-07-16 15:23:48 -0400903 if (arg->flags & FUSE_AUTO_INVAL_DATA)
904 fc->auto_inval_data = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200905 if (arg->flags & FUSE_DO_READDIRPLUS) {
Anand V. Avati0b05b182012-08-19 08:53:23 -0400906 fc->do_readdirplus = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200907 if (arg->flags & FUSE_READDIRPLUS_AUTO)
908 fc->readdirplus_auto = 1;
909 }
Miklos Szeredi60b9df72013-05-01 14:37:21 +0200910 if (arg->flags & FUSE_ASYNC_DIO)
911 fc->async_dio = 1;
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400912 if (arg->flags & FUSE_WRITEBACK_CACHE)
913 fc->writeback_cache = 1;
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200914 if (arg->flags & FUSE_PARALLEL_DIROPS)
915 fc->parallel_dirops = 1;
Miklos Szeredi5e940c12016-10-01 07:32:32 +0200916 if (arg->flags & FUSE_HANDLE_KILLPRIV)
917 fc->handle_killpriv = 1;
Miklos Szeredie27c9d32014-04-28 14:19:23 +0200918 if (arg->time_gran && arg->time_gran <= 1000000000)
919 fc->sb->s_time_gran = arg->time_gran;
Seth Forshee60bcc882016-08-29 08:46:37 -0500920 if ((arg->flags & FUSE_POSIX_ACL)) {
Miklos Szeredi29433a22016-10-01 07:32:32 +0200921 fc->default_permissions = 1;
Seth Forshee60bcc882016-08-29 08:46:37 -0500922 fc->posix_acl = 1;
923 fc->sb->s_xattr = fuse_acl_xattr_handlers;
924 }
Miklos Szeredi71421252006-06-25 05:48:52 -0700925 } else {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300926 ra_pages = fc->max_read / PAGE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700927 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200928 fc->no_flock = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700929 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800930
931 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800932 fc->minor = arg->minor;
933 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200934 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800935 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800936 }
Miklos Szeredi9759bd512015-01-06 10:45:35 +0100937 fuse_set_initialized(fc);
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700938 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800939}
940
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700941static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800942{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800943 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800944
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800945 arg->major = FUSE_KERNEL_VERSION;
946 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300947 arg->max_readahead = fc->bdi.ra_pages * PAGE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700948 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200949 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
Miklos Szeredi69fe05c2012-07-18 16:09:40 +0200950 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
Wei Fang94463852016-07-25 21:17:04 +0800951 FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400952 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200953 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT |
Seth Forshee60bcc882016-08-29 08:46:37 -0500954 FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800955 req->in.h.opcode = FUSE_INIT;
956 req->in.numargs = 1;
957 req->in.args[0].size = sizeof(*arg);
958 req->in.args[0].value = arg;
959 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800960 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800961 with interface version < 7.5. Rest of init_out is zeroed
962 by do_get_request(), so a short reply is not a problem */
963 req->out.argvar = 1;
964 req->out.args[0].size = sizeof(struct fuse_init_out);
965 req->out.args[0].value = &req->misc.init_out;
966 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100967 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800968}
969
Tejun Heo43901aa2008-11-26 12:03:56 +0100970static void fuse_free_conn(struct fuse_conn *fc)
971{
Miklos Szeredicc080e92015-07-01 16:26:08 +0200972 WARN_ON(!list_empty(&fc->devices));
Al Virodd3e2c52013-10-03 21:21:39 -0400973 kfree_rcu(fc, rcu);
Tejun Heo43901aa2008-11-26 12:03:56 +0100974}
975
Tejun Heoa325f9b2009-04-14 10:54:52 +0900976static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
977{
978 int err;
979
Jens Axboed9938312009-06-12 14:45:52 +0200980 fc->bdi.name = "fuse";
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300981 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900982 /* fuse does it's own writeback accounting */
Maxim Patlasov5a537482013-09-11 14:22:46 -0700983 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900984
985 err = bdi_init(&fc->bdi);
986 if (err)
987 return err;
988
989 fc->bdi_initialized = 1;
990
991 if (sb->s_bdev) {
992 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
993 MAJOR(fc->dev), MINOR(fc->dev));
994 } else {
995 err = bdi_register_dev(&fc->bdi, fc->dev);
996 }
997
998 if (err)
999 return err;
1000
1001 /*
1002 * For a single fuse filesystem use max 1% of dirty +
1003 * writeback threshold.
1004 *
1005 * This gives about 1M of write buffer for memory maps on a
1006 * machine with 1G and 10% dirty_ratio, which should be more
1007 * than enough.
1008 *
1009 * Privileged users can raise it by writing to
1010 *
1011 * /sys/class/bdi/<bdi>/max_ratio
1012 */
1013 bdi_set_max_ratio(&fc->bdi, 1);
1014
1015 return 0;
1016}
1017
Miklos Szeredicc080e92015-07-01 16:26:08 +02001018struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc)
1019{
1020 struct fuse_dev *fud;
1021
1022 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL);
1023 if (fud) {
1024 fud->fc = fuse_conn_get(fc);
Miklos Szeredic36960462015-07-01 16:26:09 +02001025 fuse_pqueue_init(&fud->pq);
Miklos Szeredicc080e92015-07-01 16:26:08 +02001026
1027 spin_lock(&fc->lock);
1028 list_add_tail(&fud->entry, &fc->devices);
1029 spin_unlock(&fc->lock);
1030 }
1031
1032 return fud;
1033}
1034EXPORT_SYMBOL_GPL(fuse_dev_alloc);
1035
1036void fuse_dev_free(struct fuse_dev *fud)
1037{
1038 struct fuse_conn *fc = fud->fc;
1039
1040 if (fc) {
1041 spin_lock(&fc->lock);
1042 list_del(&fud->entry);
1043 spin_unlock(&fc->lock);
1044
1045 fuse_conn_put(fc);
1046 }
1047 kfree(fud);
1048}
1049EXPORT_SYMBOL_GPL(fuse_dev_free);
1050
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001051static int fuse_fill_super(struct super_block *sb, void *data, int silent)
1052{
Miklos Szeredicc080e92015-07-01 16:26:08 +02001053 struct fuse_dev *fud;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001054 struct fuse_conn *fc;
1055 struct inode *root;
1056 struct fuse_mount_data d;
1057 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -08001058 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001059 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001060 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -08001061 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001062
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001063 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -07001064 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001065 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -07001066
Miklos Szeredi4ace1f82014-04-28 14:19:25 +02001067 sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION);
Al Viro9e1f1de2011-06-03 18:24:58 -04001068
Himangi Saraogi7b3d8bf2014-06-26 23:06:52 +05301069 if (!parse_fuse_opt(data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001070 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001071
Miklos Szeredid8091612006-12-06 20:35:48 -08001072 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001073#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001074 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -08001075 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001076 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001077#endif
Miklos Szeredid8091612006-12-06 20:35:48 -08001078 } else {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001079 sb->s_blocksize = PAGE_SIZE;
1080 sb->s_blocksize_bits = PAGE_SHIFT;
Miklos Szeredid8091612006-12-06 20:35:48 -08001081 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001082 sb->s_magic = FUSE_SUPER_MAGIC;
1083 sb->s_op = &fuse_super_operations;
Seth Forshee703c7362016-08-29 08:46:36 -05001084 sb->s_xattr = fuse_xattr_handlers;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001085 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredi0a2da9b2012-04-11 11:45:06 +02001086 sb->s_time_gran = 1;
Miklos Szeredidbd561d2008-07-25 01:49:00 -07001087 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001088
1089 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001090 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001091 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001092 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001093
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001094 if ((file->f_op != &fuse_dev_operations) ||
1095 (file->f_cred->user_ns != &init_user_ns))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001096 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -07001097
Tejun Heo0d179aa2008-11-26 12:03:55 +01001098 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001099 err = -ENOMEM;
1100 if (!fc)
1101 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001102
Tejun Heoa325f9b2009-04-14 10:54:52 +09001103 fuse_conn_init(fc);
Miklos Szeredi0ad0b322015-07-01 16:25:55 +02001104 fc->release = fuse_free_conn;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001105
Miklos Szeredicc080e92015-07-01 16:26:08 +02001106 fud = fuse_dev_alloc(fc);
1107 if (!fud)
1108 goto err_put_conn;
1109
Tejun Heoa325f9b2009-04-14 10:54:52 +09001110 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -04001111 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001112 err = fuse_bdi_init(fc, sb);
1113 if (err)
Miklos Szeredicc080e92015-07-01 16:26:08 +02001114 goto err_dev_free;
Tejun Heo0d179aa2008-11-26 12:03:55 +01001115
Jens Axboe32a88aa2009-09-16 15:02:33 +02001116 sb->s_bdi = &fc->bdi;
1117
Miklos Szeredie0a43dd2009-06-30 20:12:23 +02001118 /* Handle umasking inside the fuse code */
1119 if (sb->s_flags & MS_POSIXACL)
1120 fc->dont_mask = 1;
1121 sb->s_flags |= MS_POSIXACL;
1122
Miklos Szeredi29433a22016-10-01 07:32:32 +02001123 fc->default_permissions = d.default_permissions;
1124 fc->allow_other = d.allow_other;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001125 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001126 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +02001127 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001128
Miklos Szeredif543f252006-01-16 22:14:35 -08001129 /* Used by get_root_inode() */
1130 sb->s_fs_info = fc;
1131
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001132 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +01001133 root = fuse_get_root_inode(sb, d.rootmode);
Al Viro48fde702012-01-08 22:15:13 -05001134 root_dentry = d_make_root(root);
1135 if (!root_dentry)
Miklos Szeredicc080e92015-07-01 16:26:08 +02001136 goto err_dev_free;
Al Viroc35eebe2010-12-18 11:15:22 -05001137 /* only now - we want root dentry with NULL ->d_op */
1138 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -08001139
Maxim Patlasov4250c062012-10-26 19:48:07 +04001140 init_req = fuse_request_alloc(0);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001141 if (!init_req)
1142 goto err_put_root;
Miklos Szeredi825d6d32015-07-01 16:25:58 +02001143 __set_bit(FR_BACKGROUND, &init_req->flags);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001144
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001145 if (is_bdev) {
Maxim Patlasov4250c062012-10-26 19:48:07 +04001146 fc->destroy_req = fuse_request_alloc(0);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001147 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001148 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001149 }
1150
Miklos Szeredibafa9652006-06-25 05:48:51 -07001151 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001152 err = -EINVAL;
1153 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001154 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001155
Miklos Szeredibafa9652006-06-25 05:48:51 -07001156 err = fuse_ctl_add_conn(fc);
1157 if (err)
1158 goto err_unlock;
1159
1160 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001161 sb->s_root = root_dentry;
Miklos Szeredicc080e92015-07-01 16:26:08 +02001162 file->private_data = fud;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001163 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001164 /*
1165 * atomic_dec_and_test() in fput() provides the necessary
1166 * memory barrier for file->private_data to be visible on all
1167 * CPUs after this
1168 */
1169 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001170
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001171 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001172
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001173 return 0;
1174
Miklos Szeredibafa9652006-06-25 05:48:51 -07001175 err_unlock:
1176 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001177 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001178 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001179 err_put_root:
1180 dput(root_dentry);
Miklos Szeredicc080e92015-07-01 16:26:08 +02001181 err_dev_free:
1182 fuse_dev_free(fud);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001183 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001184 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001185 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001186 err_fput:
1187 fput(file);
1188 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001189 return err;
1190}
1191
Al Viro3c26ff62010-07-25 11:46:36 +04001192static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001193 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001194 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001195{
Al Viro3c26ff62010-07-25 11:46:36 +04001196 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001197}
1198
John Muir3b463ae2009-05-31 11:13:57 -04001199static void fuse_kill_sb_anon(struct super_block *sb)
1200{
1201 struct fuse_conn *fc = get_fuse_conn_super(sb);
1202
1203 if (fc) {
1204 down_write(&fc->killsb);
1205 fc->sb = NULL;
1206 up_write(&fc->killsb);
1207 }
1208
1209 kill_anon_super(sb);
1210}
1211
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001212static struct file_system_type fuse_fs_type = {
1213 .owner = THIS_MODULE,
1214 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001215 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001216 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001217 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001218};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001219MODULE_ALIAS_FS("fuse");
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001220
1221#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001222static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001223 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001224 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001225{
Al Viro152a0832010-07-25 00:46:55 +04001226 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001227}
1228
John Muir3b463ae2009-05-31 11:13:57 -04001229static void fuse_kill_sb_blk(struct super_block *sb)
1230{
1231 struct fuse_conn *fc = get_fuse_conn_super(sb);
1232
1233 if (fc) {
1234 down_write(&fc->killsb);
1235 fc->sb = NULL;
1236 up_write(&fc->killsb);
1237 }
1238
1239 kill_block_super(sb);
1240}
1241
Miklos Szeredid6392f82006-12-06 20:35:44 -08001242static struct file_system_type fuseblk_fs_type = {
1243 .owner = THIS_MODULE,
1244 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001245 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001246 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001247 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001248};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001249MODULE_ALIAS_FS("fuseblk");
Miklos Szeredid6392f82006-12-06 20:35:44 -08001250
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001251static inline int register_fuseblk(void)
1252{
1253 return register_filesystem(&fuseblk_fs_type);
1254}
1255
1256static inline void unregister_fuseblk(void)
1257{
1258 unregister_filesystem(&fuseblk_fs_type);
1259}
1260#else
1261static inline int register_fuseblk(void)
1262{
1263 return 0;
1264}
1265
1266static inline void unregister_fuseblk(void)
1267{
1268}
1269#endif
1270
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001271static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001272{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001273 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001274
Christoph Lametera35afb82007-05-16 22:10:57 -07001275 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001276}
1277
1278static int __init fuse_fs_init(void)
1279{
1280 int err;
1281
Miklos Szeredid6392f82006-12-06 20:35:44 -08001282 fuse_inode_cachep = kmem_cache_create("fuse_inode",
Vladimir Davydov5d097052016-01-14 15:18:21 -08001283 sizeof(struct fuse_inode), 0,
1284 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
Paul Mundt20c2df82007-07-20 10:11:58 +09001285 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001286 err = -ENOMEM;
1287 if (!fuse_inode_cachep)
Al Viro988f0322011-12-13 12:25:27 -05001288 goto out;
1289
1290 err = register_fuseblk();
1291 if (err)
1292 goto out2;
1293
1294 err = register_filesystem(&fuse_fs_type);
1295 if (err)
1296 goto out3;
Miklos Szeredid6392f82006-12-06 20:35:44 -08001297
1298 return 0;
1299
Al Viro988f0322011-12-13 12:25:27 -05001300 out3:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001301 unregister_fuseblk();
Al Viro988f0322011-12-13 12:25:27 -05001302 out2:
1303 kmem_cache_destroy(fuse_inode_cachep);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001304 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001305 return err;
1306}
1307
1308static void fuse_fs_cleanup(void)
1309{
1310 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001311 unregister_fuseblk();
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001312
1313 /*
1314 * Make sure all delayed rcu free inodes are flushed before we
1315 * destroy cache.
1316 */
1317 rcu_barrier();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001318 kmem_cache_destroy(fuse_inode_cachep);
1319}
1320
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001321static struct kobject *fuse_kobj;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001322
Miklos Szeredif543f252006-01-16 22:14:35 -08001323static int fuse_sysfs_init(void)
1324{
1325 int err;
1326
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001327 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001328 if (!fuse_kobj) {
1329 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001330 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001331 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001332
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001333 err = sysfs_create_mount_point(fuse_kobj, "connections");
1334 if (err)
Miklos Szeredif543f252006-01-16 22:14:35 -08001335 goto out_fuse_unregister;
1336
1337 return 0;
1338
1339 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001340 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001341 out_err:
1342 return err;
1343}
1344
1345static void fuse_sysfs_cleanup(void)
1346{
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001347 sysfs_remove_mount_point(fuse_kobj, "connections");
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001348 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001349}
1350
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001351static int __init fuse_init(void)
1352{
1353 int res;
1354
Miklos Szeredi1729a162008-11-26 12:03:54 +01001355 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001356 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1357
Miklos Szeredibafa9652006-06-25 05:48:51 -07001358 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001359 res = fuse_fs_init();
1360 if (res)
1361 goto err;
1362
Miklos Szeredi334f4852005-09-09 13:10:27 -07001363 res = fuse_dev_init();
1364 if (res)
1365 goto err_fs_cleanup;
1366
Miklos Szeredif543f252006-01-16 22:14:35 -08001367 res = fuse_sysfs_init();
1368 if (res)
1369 goto err_dev_cleanup;
1370
Miklos Szeredibafa9652006-06-25 05:48:51 -07001371 res = fuse_ctl_init();
1372 if (res)
1373 goto err_sysfs_cleanup;
1374
Csaba Henk487ea5a2009-08-26 19:17:22 +02001375 sanitize_global_limit(&max_user_bgreq);
1376 sanitize_global_limit(&max_user_congthresh);
1377
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001378 return 0;
1379
Miklos Szeredibafa9652006-06-25 05:48:51 -07001380 err_sysfs_cleanup:
1381 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001382 err_dev_cleanup:
1383 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001384 err_fs_cleanup:
1385 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001386 err:
1387 return res;
1388}
1389
1390static void __exit fuse_exit(void)
1391{
1392 printk(KERN_DEBUG "fuse exit\n");
1393
Miklos Szeredibafa9652006-06-25 05:48:51 -07001394 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001395 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001396 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001397 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001398}
1399
1400module_init(fuse_init);
1401module_exit(fuse_exit);