blob: 7a9b1069d267b0c040e4cab797dd22b9f012aff1 [file] [log] [blame]
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001/*
2 FUSE: Filesystem in Userspace
Miklos Szeredi1729a162008-11-26 12:03:54 +01003 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07004
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7*/
8
9#include "fuse_i.h"
10
11#include <linux/pagemap.h>
12#include <linux/slab.h>
13#include <linux/file.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070014#include <linux/seq_file.h>
15#include <linux/init.h>
16#include <linux/module.h>
Csaba Henk487ea5a2009-08-26 19:17:22 +020017#include <linux/moduleparam.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070018#include <linux/parser.h>
19#include <linux/statfs.h>
Miklos Szeredi9c8ef562006-06-25 05:48:55 -070020#include <linux/random.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040021#include <linux/sched.h>
Miklos Szeredidbd561d2008-07-25 01:49:00 -070022#include <linux/exportfs.h>
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 Szeredi68fbfcb2018-07-26 16:13:11 +0200359bool fuse_lock_inode(struct inode *inode)
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200360{
Miklos Szeredi68fbfcb2018-07-26 16:13:11 +0200361 bool locked = false;
362
363 if (!get_fuse_conn(inode)->parallel_dirops) {
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200364 mutex_lock(&get_fuse_inode(inode)->mutex);
Miklos Szeredi68fbfcb2018-07-26 16:13:11 +0200365 locked = true;
366 }
367
368 return locked;
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200369}
370
Miklos Szeredi68fbfcb2018-07-26 16:13:11 +0200371void fuse_unlock_inode(struct inode *inode, bool locked)
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200372{
Miklos Szeredi68fbfcb2018-07-26 16:13:11 +0200373 if (locked)
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200374 mutex_unlock(&get_fuse_inode(inode)->mutex);
375}
376
Al Viro42faad92008-04-24 07:21:56 -0400377static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800378{
Al Viro42faad92008-04-24 07:21:56 -0400379 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800380}
381
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800382static void fuse_send_destroy(struct fuse_conn *fc)
383{
384 struct fuse_req *req = fc->destroy_req;
385 if (req && fc->conn_init) {
386 fc->destroy_req = NULL;
387 req->in.h.opcode = FUSE_DESTROY;
Miklos Szeredi825d6d32015-07-01 16:25:58 +0200388 __set_bit(FR_FORCE, &req->flags);
389 __clear_bit(FR_BACKGROUND, &req->flags);
Tejun Heob93f8582008-11-26 12:03:55 +0100390 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800391 fuse_put_request(fc, req);
392 }
393}
394
Tejun Heoa325f9b2009-04-14 10:54:52 +0900395static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700396{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900397 if (fc->bdi_initialized)
398 bdi_destroy(&fc->bdi);
399}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700400
Tejun Heoa325f9b2009-04-14 10:54:52 +0900401static void fuse_put_super(struct super_block *sb)
402{
403 struct fuse_conn *fc = get_fuse_conn_super(sb);
404
Miklos Szeredibbd99792012-08-30 19:24:34 +0200405 mutex_lock(&fuse_mutex);
406 list_del(&fc->entry);
407 fuse_ctl_remove_conn(fc);
408 mutex_unlock(&fuse_mutex);
409 fuse_bdi_destroy(fc);
410
Miklos Szeredibafa9652006-06-25 05:48:51 -0700411 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700412}
413
Miklos Szeredie5e55582005-09-09 13:10:28 -0700414static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
415{
416 stbuf->f_type = FUSE_SUPER_MAGIC;
417 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800418 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700419 stbuf->f_blocks = attr->blocks;
420 stbuf->f_bfree = attr->bfree;
421 stbuf->f_bavail = attr->bavail;
422 stbuf->f_files = attr->files;
423 stbuf->f_ffree = attr->ffree;
424 stbuf->f_namelen = attr->namelen;
425 /* fsid is left zero */
426}
427
David Howells726c3342006-06-23 02:02:58 -0700428static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700429{
David Howells726c3342006-06-23 02:02:58 -0700430 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700431 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredi70781872014-12-12 09:49:05 +0100432 FUSE_ARGS(args);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700433 struct fuse_statfs_out outarg;
434 int err;
435
Anatol Pomozovc2132c12013-01-14 22:30:00 -0800436 if (!fuse_allow_current_process(fc)) {
Miklos Szeredie57ac682007-10-18 03:06:58 -0700437 buf->f_type = FUSE_SUPER_MAGIC;
438 return 0;
439 }
440
Miklos Szeredide5f1202006-01-06 00:19:37 -0800441 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredi70781872014-12-12 09:49:05 +0100442 args.in.numargs = 0;
443 args.in.h.opcode = FUSE_STATFS;
David Howells2b0143b2015-03-17 22:25:59 +0000444 args.in.h.nodeid = get_node_id(d_inode(dentry));
Miklos Szeredi70781872014-12-12 09:49:05 +0100445 args.out.numargs = 1;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100446 args.out.args[0].size = sizeof(outarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100447 args.out.args[0].value = &outarg;
448 err = fuse_simple_request(fc, &args);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700449 if (!err)
450 convert_fuse_statfs(buf, &outarg.st);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700451 return err;
452}
453
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700454enum {
455 OPT_FD,
456 OPT_ROOTMODE,
457 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700458 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700459 OPT_DEFAULT_PERMISSIONS,
460 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700461 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800462 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700463 OPT_ERR
464};
465
Steven Whitehousea447c092008-10-13 10:46:57 +0100466static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700467 {OPT_FD, "fd=%u"},
468 {OPT_ROOTMODE, "rootmode=%o"},
469 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700470 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700471 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
472 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700473 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800474 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700475 {OPT_ERR, NULL}
476};
477
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200478static int fuse_match_uint(substring_t *s, unsigned int *res)
479{
480 int err = -ENOMEM;
481 char *buf = match_strdup(s);
482 if (buf) {
483 err = kstrtouint(buf, 10, res);
484 kfree(buf);
485 }
486 return err;
487}
488
Miklos Szeredid8091612006-12-06 20:35:48 -0800489static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700490{
491 char *p;
492 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700493 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800494 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700495
496 while ((p = strsep(&opt, ",")) != NULL) {
497 int token;
498 int value;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200499 unsigned uv;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700500 substring_t args[MAX_OPT_ARGS];
501 if (!*p)
502 continue;
503
504 token = match_token(p, tokens, args);
505 switch (token) {
506 case OPT_FD:
507 if (match_int(&args[0], &value))
508 return 0;
509 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700510 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700511 break;
512
513 case OPT_ROOTMODE:
514 if (match_octal(&args[0], &value))
515 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700516 if (!fuse_valid_type(value))
517 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700518 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700519 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700520 break;
521
522 case OPT_USER_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200523 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700524 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200525 d->user_id = make_kuid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800526 if (!uid_valid(d->user_id))
527 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700528 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700529 break;
530
Miklos Szeredi87729a52005-09-09 13:10:34 -0700531 case OPT_GROUP_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200532 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredi87729a52005-09-09 13:10:34 -0700533 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200534 d->group_id = make_kgid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800535 if (!gid_valid(d->group_id))
536 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700537 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700538 break;
539
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700540 case OPT_DEFAULT_PERMISSIONS:
Miklos Szeredi29433a22016-10-01 07:32:32 +0200541 d->default_permissions = 1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700542 break;
543
544 case OPT_ALLOW_OTHER:
Miklos Szeredi29433a22016-10-01 07:32:32 +0200545 d->allow_other = 1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700546 break;
547
Miklos Szeredidb50b962005-09-09 13:10:33 -0700548 case OPT_MAX_READ:
549 if (match_int(&args[0], &value))
550 return 0;
551 d->max_read = value;
552 break;
553
Miklos Szeredid8091612006-12-06 20:35:48 -0800554 case OPT_BLKSIZE:
555 if (!is_bdev || match_int(&args[0], &value))
556 return 0;
557 d->blksize = value;
558 break;
559
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700560 default:
561 return 0;
562 }
563 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700564
565 if (!d->fd_present || !d->rootmode_present ||
566 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700567 return 0;
568
569 return 1;
570}
571
Al Viro34c80b12011-12-08 21:32:45 -0500572static int fuse_show_options(struct seq_file *m, struct dentry *root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700573{
Al Viro34c80b12011-12-08 21:32:45 -0500574 struct super_block *sb = root->d_sb;
575 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700576
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800577 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id));
578 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id));
Miklos Szeredi29433a22016-10-01 07:32:32 +0200579 if (fc->default_permissions)
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700580 seq_puts(m, ",default_permissions");
Miklos Szeredi29433a22016-10-01 07:32:32 +0200581 if (fc->allow_other)
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700582 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700583 if (fc->max_read != ~0)
584 seq_printf(m, ",max_read=%u", fc->max_read);
Al Viro34c80b12011-12-08 21:32:45 -0500585 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
586 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700587 return 0;
588}
589
Miklos Szeredif88996a2015-07-01 16:26:01 +0200590static void fuse_iqueue_init(struct fuse_iqueue *fiq)
591{
592 memset(fiq, 0, sizeof(struct fuse_iqueue));
593 init_waitqueue_head(&fiq->waitq);
594 INIT_LIST_HEAD(&fiq->pending);
595 INIT_LIST_HEAD(&fiq->interrupts);
596 fiq->forget_list_tail = &fiq->forget_list_head;
Miklos Szeredie16714d2015-07-01 16:26:01 +0200597 fiq->connected = 1;
Miklos Szeredif88996a2015-07-01 16:26:01 +0200598}
599
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200600static void fuse_pqueue_init(struct fuse_pqueue *fpq)
601{
602 memset(fpq, 0, sizeof(struct fuse_pqueue));
Miklos Szeredi45a91cb2015-07-01 16:26:06 +0200603 spin_lock_init(&fpq->lock);
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200604 INIT_LIST_HEAD(&fpq->processing);
605 INIT_LIST_HEAD(&fpq->io);
Miklos Szeredie96edd92015-07-01 16:26:04 +0200606 fpq->connected = 1;
Miklos Szeredi3a2b5b92015-07-01 16:26:04 +0200607}
608
Tejun Heoa325f9b2009-04-14 10:54:52 +0900609void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700610{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100611 memset(fc, 0, sizeof(*fc));
612 spin_lock_init(&fc->lock);
John Muir3b463ae2009-05-31 11:13:57 -0400613 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100614 atomic_set(&fc->count, 1);
Miklos Szeredic36960462015-07-01 16:26:09 +0200615 atomic_set(&fc->dev_count, 1);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100616 init_waitqueue_head(&fc->blocked_waitq);
617 init_waitqueue_head(&fc->reserved_req_waitq);
Miklos Szeredif88996a2015-07-01 16:26:01 +0200618 fuse_iqueue_init(&fc->iq);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100619 INIT_LIST_HEAD(&fc->bg_queue);
620 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredicc080e92015-07-01 16:26:08 +0200621 INIT_LIST_HEAD(&fc->devices);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100622 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700623 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
624 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100625 fc->khctr = 0;
626 fc->polled_files = RB_ROOT;
Maxim Patlasov0aada882013-03-21 18:02:28 +0400627 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400628 fc->initialized = 0;
Miklos Szeredie16714d2015-07-01 16:26:01 +0200629 fc->connected = 1;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100630 fc->attr_version = 1;
631 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700632}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100633EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700634
Miklos Szeredibafa9652006-06-25 05:48:51 -0700635void fuse_conn_put(struct fuse_conn *fc)
636{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700637 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800638 if (fc->destroy_req)
639 fuse_request_free(fc->destroy_req);
Tejun Heo43901aa2008-11-26 12:03:56 +0100640 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700641 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700642}
Tejun Heo08cbf542009-04-14 10:54:53 +0900643EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700644
645struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
646{
647 atomic_inc(&fc->count);
648 return fc;
649}
Tejun Heo08cbf542009-04-14 10:54:53 +0900650EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700651
Tejun Heob93f8582008-11-26 12:03:55 +0100652static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700653{
654 struct fuse_attr attr;
655 memset(&attr, 0, sizeof(attr));
656
657 attr.mode = mode;
658 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700659 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700660 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700661}
662
Miklos Szeredi1729a162008-11-26 12:03:54 +0100663struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700664 u64 nodeid;
665 u32 generation;
666};
667
668static struct dentry *fuse_get_dentry(struct super_block *sb,
669 struct fuse_inode_handle *handle)
670{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700671 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700672 struct inode *inode;
673 struct dentry *entry;
674 int err = -ESTALE;
675
676 if (handle->nodeid == 0)
677 goto out_err;
678
679 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700680 if (!inode) {
681 struct fuse_entry_out outarg;
Al Viro13983d02016-07-20 22:34:44 -0400682 const struct qstr name = QSTR_INIT(".", 1);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700683
684 if (!fc->export_support)
685 goto out_err;
686
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700687 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
688 &inode);
689 if (err && err != -ENOENT)
690 goto out_err;
691 if (err || !inode) {
692 err = -ESTALE;
693 goto out_err;
694 }
695 err = -EIO;
696 if (get_node_id(inode) != handle->nodeid)
697 goto out_iput;
698 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700699 err = -ESTALE;
700 if (inode->i_generation != handle->generation)
701 goto out_iput;
702
Christoph Hellwig44003722008-08-11 15:49:04 +0200703 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500704 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700705 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700706
707 return entry;
708
709 out_iput:
710 iput(inode);
711 out_err:
712 return ERR_PTR(err);
713}
714
Al Virob0b03822012-04-02 14:34:06 -0400715static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
716 struct inode *parent)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700717{
Al Virob0b03822012-04-02 14:34:06 -0400718 int len = parent ? 6 : 3;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700719 u64 nodeid;
720 u32 generation;
721
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530722 if (*max_len < len) {
723 *max_len = len;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900724 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530725 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700726
727 nodeid = get_fuse_inode(inode)->nodeid;
728 generation = inode->i_generation;
729
730 fh[0] = (u32)(nodeid >> 32);
731 fh[1] = (u32)(nodeid & 0xffffffff);
732 fh[2] = generation;
733
Al Virob0b03822012-04-02 14:34:06 -0400734 if (parent) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700735 nodeid = get_fuse_inode(parent)->nodeid;
736 generation = parent->i_generation;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700737
738 fh[3] = (u32)(nodeid >> 32);
739 fh[4] = (u32)(nodeid & 0xffffffff);
740 fh[5] = generation;
741 }
742
743 *max_len = len;
Al Virob0b03822012-04-02 14:34:06 -0400744 return parent ? 0x82 : 0x81;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700745}
746
747static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
748 struct fid *fid, int fh_len, int fh_type)
749{
750 struct fuse_inode_handle handle;
751
752 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
753 return NULL;
754
755 handle.nodeid = (u64) fid->raw[0] << 32;
756 handle.nodeid |= (u64) fid->raw[1];
757 handle.generation = fid->raw[2];
758 return fuse_get_dentry(sb, &handle);
759}
760
761static struct dentry *fuse_fh_to_parent(struct super_block *sb,
762 struct fid *fid, int fh_len, int fh_type)
763{
764 struct fuse_inode_handle parent;
765
766 if (fh_type != 0x82 || fh_len < 6)
767 return NULL;
768
769 parent.nodeid = (u64) fid->raw[3] << 32;
770 parent.nodeid |= (u64) fid->raw[4];
771 parent.generation = fid->raw[5];
772 return fuse_get_dentry(sb, &parent);
773}
774
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700775static struct dentry *fuse_get_parent(struct dentry *child)
776{
David Howells2b0143b2015-03-17 22:25:59 +0000777 struct inode *child_inode = d_inode(child);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700778 struct fuse_conn *fc = get_fuse_conn(child_inode);
779 struct inode *inode;
780 struct dentry *parent;
781 struct fuse_entry_out outarg;
Al Viro13983d02016-07-20 22:34:44 -0400782 const struct qstr name = QSTR_INIT("..", 2);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700783 int err;
784
785 if (!fc->export_support)
786 return ERR_PTR(-ESTALE);
787
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700788 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
789 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200790 if (err) {
791 if (err == -ENOENT)
792 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700793 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700794 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200795
796 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500797 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700798 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700799
800 return parent;
801}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700802
803static const struct export_operations fuse_export_operations = {
804 .fh_to_dentry = fuse_fh_to_dentry,
805 .fh_to_parent = fuse_fh_to_parent,
806 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700807 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700808};
809
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800810static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700811 .alloc_inode = fuse_alloc_inode,
812 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400813 .evict_inode = fuse_evict_inode,
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200814 .write_inode = fuse_write_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700815 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700816 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700817 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800818 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700819 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700820 .show_options = fuse_show_options,
821};
822
Csaba Henk487ea5a2009-08-26 19:17:22 +0200823static void sanitize_global_limit(unsigned *limit)
824{
825 if (*limit == 0)
Jiang Liu0ed5fd12013-07-03 15:03:43 -0700826 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
Csaba Henk487ea5a2009-08-26 19:17:22 +0200827 sizeof(struct fuse_req);
828
829 if (*limit >= 1 << 16)
830 *limit = (1 << 16) - 1;
831}
832
833static int set_global_limit(const char *val, struct kernel_param *kp)
834{
835 int rv;
836
837 rv = param_set_uint(val, kp);
838 if (rv)
839 return rv;
840
841 sanitize_global_limit((unsigned *)kp->arg);
842
843 return 0;
844}
845
846static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
847{
848 int cap_sys_admin = capable(CAP_SYS_ADMIN);
849
850 if (arg->minor < 13)
851 return;
852
853 sanitize_global_limit(&max_user_bgreq);
854 sanitize_global_limit(&max_user_congthresh);
855
856 if (arg->max_background) {
857 fc->max_background = arg->max_background;
858
859 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
860 fc->max_background = max_user_bgreq;
861 }
862 if (arg->congestion_threshold) {
863 fc->congestion_threshold = arg->congestion_threshold;
864
865 if (!cap_sys_admin &&
866 fc->congestion_threshold > max_user_congthresh)
867 fc->congestion_threshold = max_user_congthresh;
868 }
869}
870
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800871static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
872{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800873 struct fuse_init_out *arg = &req->misc.init_out;
874
875 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
876 fc->conn_error = 1;
877 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800878 unsigned long ra_pages;
879
Csaba Henk487ea5a2009-08-26 19:17:22 +0200880 process_init_limits(fc, arg);
881
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800882 if (arg->minor >= 6) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300883 ra_pages = arg->max_readahead / PAGE_SIZE;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800884 if (arg->flags & FUSE_ASYNC_READ)
885 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700886 if (!(arg->flags & FUSE_POSIX_LOCKS))
887 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200888 if (arg->minor >= 17) {
889 if (!(arg->flags & FUSE_FLOCK_LOCKS))
890 fc->no_flock = 1;
Miklos Szeredi24114502011-09-12 09:31:49 +0200891 } else {
892 if (!(arg->flags & FUSE_POSIX_LOCKS))
893 fc->no_flock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200894 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700895 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
896 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700897 if (arg->minor >= 9) {
898 /* LOOKUP has dependency on proto version */
899 if (arg->flags & FUSE_EXPORT_SUPPORT)
900 fc->export_support = 1;
901 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700902 if (arg->flags & FUSE_BIG_WRITES)
903 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200904 if (arg->flags & FUSE_DONT_MASK)
905 fc->dont_mask = 1;
Brian Foster72d0d242012-07-16 15:23:48 -0400906 if (arg->flags & FUSE_AUTO_INVAL_DATA)
907 fc->auto_inval_data = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200908 if (arg->flags & FUSE_DO_READDIRPLUS) {
Anand V. Avati0b05b182012-08-19 08:53:23 -0400909 fc->do_readdirplus = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200910 if (arg->flags & FUSE_READDIRPLUS_AUTO)
911 fc->readdirplus_auto = 1;
912 }
Miklos Szeredi60b9df72013-05-01 14:37:21 +0200913 if (arg->flags & FUSE_ASYNC_DIO)
914 fc->async_dio = 1;
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400915 if (arg->flags & FUSE_WRITEBACK_CACHE)
916 fc->writeback_cache = 1;
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200917 if (arg->flags & FUSE_PARALLEL_DIROPS)
918 fc->parallel_dirops = 1;
Miklos Szeredi5e940c12016-10-01 07:32:32 +0200919 if (arg->flags & FUSE_HANDLE_KILLPRIV)
920 fc->handle_killpriv = 1;
Miklos Szeredie27c9d32014-04-28 14:19:23 +0200921 if (arg->time_gran && arg->time_gran <= 1000000000)
922 fc->sb->s_time_gran = arg->time_gran;
Seth Forshee60bcc882016-08-29 08:46:37 -0500923 if ((arg->flags & FUSE_POSIX_ACL)) {
Miklos Szeredi29433a22016-10-01 07:32:32 +0200924 fc->default_permissions = 1;
Seth Forshee60bcc882016-08-29 08:46:37 -0500925 fc->posix_acl = 1;
926 fc->sb->s_xattr = fuse_acl_xattr_handlers;
927 }
Miklos Szeredi71421252006-06-25 05:48:52 -0700928 } else {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300929 ra_pages = fc->max_read / PAGE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700930 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200931 fc->no_flock = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700932 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800933
934 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800935 fc->minor = arg->minor;
936 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200937 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800938 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800939 }
Miklos Szeredi9759bd512015-01-06 10:45:35 +0100940 fuse_set_initialized(fc);
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700941 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800942}
943
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700944static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800945{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800946 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800947
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800948 arg->major = FUSE_KERNEL_VERSION;
949 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300950 arg->max_readahead = fc->bdi.ra_pages * PAGE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700951 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200952 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
Miklos Szeredi69fe05c2012-07-18 16:09:40 +0200953 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
Wei Fang94463852016-07-25 21:17:04 +0800954 FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400955 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
Miklos Szeredi5c672ab2016-06-30 13:10:49 +0200956 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT |
Seth Forshee60bcc882016-08-29 08:46:37 -0500957 FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800958 req->in.h.opcode = FUSE_INIT;
959 req->in.numargs = 1;
960 req->in.args[0].size = sizeof(*arg);
961 req->in.args[0].value = arg;
962 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800963 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800964 with interface version < 7.5. Rest of init_out is zeroed
965 by do_get_request(), so a short reply is not a problem */
966 req->out.argvar = 1;
967 req->out.args[0].size = sizeof(struct fuse_init_out);
968 req->out.args[0].value = &req->misc.init_out;
969 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100970 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800971}
972
Tejun Heo43901aa2008-11-26 12:03:56 +0100973static void fuse_free_conn(struct fuse_conn *fc)
974{
Miklos Szeredicc080e92015-07-01 16:26:08 +0200975 WARN_ON(!list_empty(&fc->devices));
Al Virodd3e2c52013-10-03 21:21:39 -0400976 kfree_rcu(fc, rcu);
Tejun Heo43901aa2008-11-26 12:03:56 +0100977}
978
Tejun Heoa325f9b2009-04-14 10:54:52 +0900979static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
980{
981 int err;
982
Jens Axboed9938312009-06-12 14:45:52 +0200983 fc->bdi.name = "fuse";
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300984 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900985 /* fuse does it's own writeback accounting */
Maxim Patlasov5a537482013-09-11 14:22:46 -0700986 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900987
988 err = bdi_init(&fc->bdi);
989 if (err)
990 return err;
991
992 fc->bdi_initialized = 1;
993
994 if (sb->s_bdev) {
995 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
996 MAJOR(fc->dev), MINOR(fc->dev));
997 } else {
998 err = bdi_register_dev(&fc->bdi, fc->dev);
999 }
1000
1001 if (err)
1002 return err;
1003
1004 /*
1005 * For a single fuse filesystem use max 1% of dirty +
1006 * writeback threshold.
1007 *
1008 * This gives about 1M of write buffer for memory maps on a
1009 * machine with 1G and 10% dirty_ratio, which should be more
1010 * than enough.
1011 *
1012 * Privileged users can raise it by writing to
1013 *
1014 * /sys/class/bdi/<bdi>/max_ratio
1015 */
1016 bdi_set_max_ratio(&fc->bdi, 1);
1017
1018 return 0;
1019}
1020
Miklos Szeredicc080e92015-07-01 16:26:08 +02001021struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc)
1022{
1023 struct fuse_dev *fud;
1024
1025 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL);
1026 if (fud) {
1027 fud->fc = fuse_conn_get(fc);
Miklos Szeredic36960462015-07-01 16:26:09 +02001028 fuse_pqueue_init(&fud->pq);
Miklos Szeredicc080e92015-07-01 16:26:08 +02001029
1030 spin_lock(&fc->lock);
1031 list_add_tail(&fud->entry, &fc->devices);
1032 spin_unlock(&fc->lock);
1033 }
1034
1035 return fud;
1036}
1037EXPORT_SYMBOL_GPL(fuse_dev_alloc);
1038
1039void fuse_dev_free(struct fuse_dev *fud)
1040{
1041 struct fuse_conn *fc = fud->fc;
1042
1043 if (fc) {
1044 spin_lock(&fc->lock);
1045 list_del(&fud->entry);
1046 spin_unlock(&fc->lock);
1047
1048 fuse_conn_put(fc);
1049 }
1050 kfree(fud);
1051}
1052EXPORT_SYMBOL_GPL(fuse_dev_free);
1053
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001054static int fuse_fill_super(struct super_block *sb, void *data, int silent)
1055{
Miklos Szeredicc080e92015-07-01 16:26:08 +02001056 struct fuse_dev *fud;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001057 struct fuse_conn *fc;
1058 struct inode *root;
1059 struct fuse_mount_data d;
1060 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -08001061 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001062 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001063 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -08001064 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001065
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001066 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -07001067 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001068 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -07001069
Miklos Szeredi4ace1f82014-04-28 14:19:25 +02001070 sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION);
Al Viro9e1f1de2011-06-03 18:24:58 -04001071
Himangi Saraogi7b3d8bf2014-06-26 23:06:52 +05301072 if (!parse_fuse_opt(data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001073 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001074
Miklos Szeredid8091612006-12-06 20:35:48 -08001075 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001076#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001077 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -08001078 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001079 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001080#endif
Miklos Szeredid8091612006-12-06 20:35:48 -08001081 } else {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001082 sb->s_blocksize = PAGE_SIZE;
1083 sb->s_blocksize_bits = PAGE_SHIFT;
Miklos Szeredid8091612006-12-06 20:35:48 -08001084 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001085 sb->s_magic = FUSE_SUPER_MAGIC;
1086 sb->s_op = &fuse_super_operations;
Seth Forshee703c7362016-08-29 08:46:36 -05001087 sb->s_xattr = fuse_xattr_handlers;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001088 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredi0a2da9b2012-04-11 11:45:06 +02001089 sb->s_time_gran = 1;
Miklos Szeredidbd561d2008-07-25 01:49:00 -07001090 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001091
1092 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001093 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001094 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001095 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001096
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001097 if ((file->f_op != &fuse_dev_operations) ||
1098 (file->f_cred->user_ns != &init_user_ns))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001099 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -07001100
Tejun Heo0d179aa2008-11-26 12:03:55 +01001101 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001102 err = -ENOMEM;
1103 if (!fc)
1104 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001105
Tejun Heoa325f9b2009-04-14 10:54:52 +09001106 fuse_conn_init(fc);
Miklos Szeredi0ad0b322015-07-01 16:25:55 +02001107 fc->release = fuse_free_conn;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001108
Miklos Szeredicc080e92015-07-01 16:26:08 +02001109 fud = fuse_dev_alloc(fc);
1110 if (!fud)
1111 goto err_put_conn;
1112
Tejun Heoa325f9b2009-04-14 10:54:52 +09001113 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -04001114 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001115 err = fuse_bdi_init(fc, sb);
1116 if (err)
Miklos Szeredicc080e92015-07-01 16:26:08 +02001117 goto err_dev_free;
Tejun Heo0d179aa2008-11-26 12:03:55 +01001118
Jens Axboe32a88aa2009-09-16 15:02:33 +02001119 sb->s_bdi = &fc->bdi;
1120
Miklos Szeredie0a43dd2009-06-30 20:12:23 +02001121 /* Handle umasking inside the fuse code */
1122 if (sb->s_flags & MS_POSIXACL)
1123 fc->dont_mask = 1;
1124 sb->s_flags |= MS_POSIXACL;
1125
Miklos Szeredi29433a22016-10-01 07:32:32 +02001126 fc->default_permissions = d.default_permissions;
1127 fc->allow_other = d.allow_other;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001128 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001129 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +02001130 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001131
Miklos Szeredif543f252006-01-16 22:14:35 -08001132 /* Used by get_root_inode() */
1133 sb->s_fs_info = fc;
1134
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001135 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +01001136 root = fuse_get_root_inode(sb, d.rootmode);
Miklos Szeredi0ce267f2016-10-18 15:36:48 +02001137 sb->s_d_op = &fuse_root_dentry_operations;
Al Viro48fde702012-01-08 22:15:13 -05001138 root_dentry = d_make_root(root);
1139 if (!root_dentry)
Miklos Szeredicc080e92015-07-01 16:26:08 +02001140 goto err_dev_free;
Miklos Szeredi0ce267f2016-10-18 15:36:48 +02001141 /* Root dentry doesn't have .d_revalidate */
Al Viroc35eebe2010-12-18 11:15:22 -05001142 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -08001143
Maxim Patlasov4250c062012-10-26 19:48:07 +04001144 init_req = fuse_request_alloc(0);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001145 if (!init_req)
1146 goto err_put_root;
Miklos Szeredi825d6d32015-07-01 16:25:58 +02001147 __set_bit(FR_BACKGROUND, &init_req->flags);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001148
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001149 if (is_bdev) {
Maxim Patlasov4250c062012-10-26 19:48:07 +04001150 fc->destroy_req = fuse_request_alloc(0);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001151 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001152 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001153 }
1154
Miklos Szeredibafa9652006-06-25 05:48:51 -07001155 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001156 err = -EINVAL;
1157 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001158 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001159
Miklos Szeredibafa9652006-06-25 05:48:51 -07001160 err = fuse_ctl_add_conn(fc);
1161 if (err)
1162 goto err_unlock;
1163
1164 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001165 sb->s_root = root_dentry;
Miklos Szeredicc080e92015-07-01 16:26:08 +02001166 file->private_data = fud;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001167 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001168 /*
1169 * atomic_dec_and_test() in fput() provides the necessary
1170 * memory barrier for file->private_data to be visible on all
1171 * CPUs after this
1172 */
1173 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001174
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001175 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001176
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001177 return 0;
1178
Miklos Szeredibafa9652006-06-25 05:48:51 -07001179 err_unlock:
1180 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001181 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001182 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001183 err_put_root:
1184 dput(root_dentry);
Miklos Szeredicc080e92015-07-01 16:26:08 +02001185 err_dev_free:
1186 fuse_dev_free(fud);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001187 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001188 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001189 fuse_conn_put(fc);
Tetsuo Handaa0fbcaf2018-05-01 13:12:14 +09001190 sb->s_fs_info = NULL;
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001191 err_fput:
1192 fput(file);
1193 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001194 return err;
1195}
1196
Al Viro3c26ff62010-07-25 11:46:36 +04001197static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001198 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001199 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001200{
Al Viro3c26ff62010-07-25 11:46:36 +04001201 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001202}
1203
Miklos Szeredi263508c2018-07-26 16:13:11 +02001204static void fuse_sb_destroy(struct super_block *sb)
John Muir3b463ae2009-05-31 11:13:57 -04001205{
1206 struct fuse_conn *fc = get_fuse_conn_super(sb);
1207
1208 if (fc) {
Miklos Szeredi263508c2018-07-26 16:13:11 +02001209 fuse_send_destroy(fc);
1210
1211 fuse_abort_conn(fc);
1212 fuse_wait_aborted(fc);
1213
John Muir3b463ae2009-05-31 11:13:57 -04001214 down_write(&fc->killsb);
1215 fc->sb = NULL;
1216 up_write(&fc->killsb);
1217 }
Miklos Szeredi263508c2018-07-26 16:13:11 +02001218}
John Muir3b463ae2009-05-31 11:13:57 -04001219
Miklos Szeredi263508c2018-07-26 16:13:11 +02001220static void fuse_kill_sb_anon(struct super_block *sb)
1221{
1222 fuse_sb_destroy(sb);
John Muir3b463ae2009-05-31 11:13:57 -04001223 kill_anon_super(sb);
1224}
1225
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001226static struct file_system_type fuse_fs_type = {
1227 .owner = THIS_MODULE,
1228 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001229 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001230 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001231 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001232};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001233MODULE_ALIAS_FS("fuse");
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001234
1235#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001236static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001237 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001238 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001239{
Al Viro152a0832010-07-25 00:46:55 +04001240 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001241}
1242
John Muir3b463ae2009-05-31 11:13:57 -04001243static void fuse_kill_sb_blk(struct super_block *sb)
1244{
Miklos Szeredi263508c2018-07-26 16:13:11 +02001245 fuse_sb_destroy(sb);
John Muir3b463ae2009-05-31 11:13:57 -04001246 kill_block_super(sb);
1247}
1248
Miklos Szeredid6392f82006-12-06 20:35:44 -08001249static struct file_system_type fuseblk_fs_type = {
1250 .owner = THIS_MODULE,
1251 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001252 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001253 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001254 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001255};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001256MODULE_ALIAS_FS("fuseblk");
Miklos Szeredid6392f82006-12-06 20:35:44 -08001257
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001258static inline int register_fuseblk(void)
1259{
1260 return register_filesystem(&fuseblk_fs_type);
1261}
1262
1263static inline void unregister_fuseblk(void)
1264{
1265 unregister_filesystem(&fuseblk_fs_type);
1266}
1267#else
1268static inline int register_fuseblk(void)
1269{
1270 return 0;
1271}
1272
1273static inline void unregister_fuseblk(void)
1274{
1275}
1276#endif
1277
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001278static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001279{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001280 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001281
Christoph Lametera35afb82007-05-16 22:10:57 -07001282 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001283}
1284
1285static int __init fuse_fs_init(void)
1286{
1287 int err;
1288
Miklos Szeredid6392f82006-12-06 20:35:44 -08001289 fuse_inode_cachep = kmem_cache_create("fuse_inode",
Vladimir Davydov5d097052016-01-14 15:18:21 -08001290 sizeof(struct fuse_inode), 0,
1291 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
Paul Mundt20c2df82007-07-20 10:11:58 +09001292 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001293 err = -ENOMEM;
1294 if (!fuse_inode_cachep)
Al Viro988f0322011-12-13 12:25:27 -05001295 goto out;
1296
1297 err = register_fuseblk();
1298 if (err)
1299 goto out2;
1300
1301 err = register_filesystem(&fuse_fs_type);
1302 if (err)
1303 goto out3;
Miklos Szeredid6392f82006-12-06 20:35:44 -08001304
1305 return 0;
1306
Al Viro988f0322011-12-13 12:25:27 -05001307 out3:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001308 unregister_fuseblk();
Al Viro988f0322011-12-13 12:25:27 -05001309 out2:
1310 kmem_cache_destroy(fuse_inode_cachep);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001311 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001312 return err;
1313}
1314
1315static void fuse_fs_cleanup(void)
1316{
1317 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001318 unregister_fuseblk();
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001319
1320 /*
1321 * Make sure all delayed rcu free inodes are flushed before we
1322 * destroy cache.
1323 */
1324 rcu_barrier();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001325 kmem_cache_destroy(fuse_inode_cachep);
1326}
1327
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001328static struct kobject *fuse_kobj;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001329
Miklos Szeredif543f252006-01-16 22:14:35 -08001330static int fuse_sysfs_init(void)
1331{
1332 int err;
1333
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001334 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001335 if (!fuse_kobj) {
1336 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001337 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001338 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001339
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001340 err = sysfs_create_mount_point(fuse_kobj, "connections");
1341 if (err)
Miklos Szeredif543f252006-01-16 22:14:35 -08001342 goto out_fuse_unregister;
1343
1344 return 0;
1345
1346 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001347 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001348 out_err:
1349 return err;
1350}
1351
1352static void fuse_sysfs_cleanup(void)
1353{
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001354 sysfs_remove_mount_point(fuse_kobj, "connections");
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001355 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001356}
1357
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001358static int __init fuse_init(void)
1359{
1360 int res;
1361
Miklos Szeredi1729a162008-11-26 12:03:54 +01001362 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001363 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1364
Miklos Szeredibafa9652006-06-25 05:48:51 -07001365 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001366 res = fuse_fs_init();
1367 if (res)
1368 goto err;
1369
Miklos Szeredi334f4852005-09-09 13:10:27 -07001370 res = fuse_dev_init();
1371 if (res)
1372 goto err_fs_cleanup;
1373
Miklos Szeredif543f252006-01-16 22:14:35 -08001374 res = fuse_sysfs_init();
1375 if (res)
1376 goto err_dev_cleanup;
1377
Miklos Szeredibafa9652006-06-25 05:48:51 -07001378 res = fuse_ctl_init();
1379 if (res)
1380 goto err_sysfs_cleanup;
1381
Csaba Henk487ea5a2009-08-26 19:17:22 +02001382 sanitize_global_limit(&max_user_bgreq);
1383 sanitize_global_limit(&max_user_congthresh);
1384
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001385 return 0;
1386
Miklos Szeredibafa9652006-06-25 05:48:51 -07001387 err_sysfs_cleanup:
1388 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001389 err_dev_cleanup:
1390 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001391 err_fs_cleanup:
1392 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001393 err:
1394 return res;
1395}
1396
1397static void __exit fuse_exit(void)
1398{
1399 printk(KERN_DEBUG "fuse exit\n");
1400
Miklos Szeredibafa9652006-06-25 05:48:51 -07001401 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001402 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001403 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001404 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001405}
1406
1407module_init(fuse_init);
1408module_exit(fuse_exit);