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Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001/*
2 FUSE: Filesystem in Userspace
Miklos Szeredi1729a162008-11-26 12:03:54 +01003 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07004
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7*/
8
9#include "fuse_i.h"
10
11#include <linux/pagemap.h>
12#include <linux/slab.h>
13#include <linux/file.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070014#include <linux/seq_file.h>
15#include <linux/init.h>
16#include <linux/module.h>
Csaba Henk487ea5a2009-08-26 19:17:22 +020017#include <linux/moduleparam.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070018#include <linux/parser.h>
19#include <linux/statfs.h>
Miklos Szeredi9c8ef562006-06-25 05:48:55 -070020#include <linux/random.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040021#include <linux/sched.h>
Miklos Szeredidbd561d2008-07-25 01:49:00 -070022#include <linux/exportfs.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070023
24MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
25MODULE_DESCRIPTION("Filesystem in Userspace");
26MODULE_LICENSE("GPL");
27
Christoph Lametere18b8902006-12-06 20:33:20 -080028static struct kmem_cache *fuse_inode_cachep;
Miklos Szeredibafa9652006-06-25 05:48:51 -070029struct list_head fuse_conn_list;
30DEFINE_MUTEX(fuse_mutex);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070031
Csaba Henk487ea5a2009-08-26 19:17:22 +020032static int set_global_limit(const char *val, struct kernel_param *kp);
33
Csaba Henk79a9d992009-08-26 19:18:24 +020034unsigned max_user_bgreq;
Csaba Henk487ea5a2009-08-26 19:17:22 +020035module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
36 &max_user_bgreq, 0644);
37__MODULE_PARM_TYPE(max_user_bgreq, "uint");
38MODULE_PARM_DESC(max_user_bgreq,
39 "Global limit for the maximum number of backgrounded requests an "
40 "unprivileged user can set");
41
Csaba Henk79a9d992009-08-26 19:18:24 +020042unsigned max_user_congthresh;
Csaba Henk487ea5a2009-08-26 19:17:22 +020043module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
44 &max_user_congthresh, 0644);
45__MODULE_PARM_TYPE(max_user_congthresh, "uint");
46MODULE_PARM_DESC(max_user_congthresh,
47 "Global limit for the maximum congestion threshold an "
48 "unprivileged user can set");
49
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070050#define FUSE_SUPER_MAGIC 0x65735546
51
Miklos Szeredid1875db2008-02-08 04:21:43 -080052#define FUSE_DEFAULT_BLKSIZE 512
53
Csaba Henk7a6d3c82009-07-01 17:28:41 -070054/** Maximum number of outstanding background requests */
55#define FUSE_DEFAULT_MAX_BACKGROUND 12
56
57/** Congestion starts at 75% of maximum */
58#define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)
59
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070060struct fuse_mount_data {
61 int fd;
62 unsigned rootmode;
Eric W. Biederman499dcf22012-02-07 16:26:03 -080063 kuid_t user_id;
64 kgid_t group_id;
Miklos Szeredi1729a162008-11-26 12:03:54 +010065 unsigned fd_present:1;
66 unsigned rootmode_present:1;
67 unsigned user_id_present:1;
68 unsigned group_id_present:1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -070069 unsigned flags;
Miklos Szeredidb50b962005-09-09 13:10:33 -070070 unsigned max_read;
Miklos Szeredid8091612006-12-06 20:35:48 -080071 unsigned blksize;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070072};
73
Randy Dunlapa2daff62011-05-31 14:09:00 -070074struct fuse_forget_link *fuse_alloc_forget(void)
Miklos Szeredi07e77dc2010-12-07 20:16:56 +010075{
76 return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
77}
78
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070079static struct inode *fuse_alloc_inode(struct super_block *sb)
80{
81 struct inode *inode;
82 struct fuse_inode *fi;
83
Christoph Lametere94b1762006-12-06 20:33:17 -080084 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070085 if (!inode)
86 return NULL;
87
88 fi = get_fuse_inode(inode);
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070089 fi->i_time = 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070090 fi->nodeid = 0;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070091 fi->nlookup = 0;
John Muirfbee36b2007-11-28 16:22:02 -080092 fi->attr_version = 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -070093 fi->writectr = 0;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +040094 fi->orig_ino = 0;
Feng Shuo4582a4a2013-01-15 11:23:28 +080095 fi->state = 0;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070096 INIT_LIST_HEAD(&fi->write_files);
Miklos Szeredi3be5a522008-04-30 00:54:41 -070097 INIT_LIST_HEAD(&fi->queued_writes);
98 INIT_LIST_HEAD(&fi->writepages);
99 init_waitqueue_head(&fi->page_waitq);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100100 fi->forget = fuse_alloc_forget();
101 if (!fi->forget) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700102 kmem_cache_free(fuse_inode_cachep, inode);
103 return NULL;
104 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700105
106 return inode;
107}
108
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100109static void fuse_i_callback(struct rcu_head *head)
110{
111 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100112 kmem_cache_free(fuse_inode_cachep, inode);
113}
114
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700115static void fuse_destroy_inode(struct inode *inode)
116{
Miklos Szeredie5e55582005-09-09 13:10:28 -0700117 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700118 BUG_ON(!list_empty(&fi->write_files));
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700119 BUG_ON(!list_empty(&fi->queued_writes));
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100120 kfree(fi->forget);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100121 call_rcu(&inode->i_rcu, fuse_i_callback);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700122}
123
Al Virob57922d2010-06-07 14:34:48 -0400124static void fuse_evict_inode(struct inode *inode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700125{
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700126 truncate_inode_pages_final(&inode->i_data);
Jan Karadbd57682012-05-03 14:48:02 +0200127 clear_inode(inode);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700128 if (inode->i_sb->s_flags & MS_ACTIVE) {
129 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700130 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100131 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
132 fi->forget = NULL;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700133 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700134}
135
Miklos Szeredi71421252006-06-25 05:48:52 -0700136static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
137{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400138 sync_filesystem(sb);
Miklos Szeredi71421252006-06-25 05:48:52 -0700139 if (*flags & MS_MANDLOCK)
140 return -EINVAL;
141
142 return 0;
143}
144
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400145/*
146 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
147 * so that it will fit.
148 */
149static ino_t fuse_squash_ino(u64 ino64)
150{
151 ino_t ino = (ino_t) ino64;
152 if (sizeof(ino_t) < sizeof(u64))
153 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8;
154 return ino;
155}
156
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700157void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
158 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700159{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700160 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700161 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700162
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700163 fi->attr_version = ++fc->attr_version;
164 fi->i_time = attr_valid;
165
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400166 inode->i_ino = fuse_squash_ino(attr->ino);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700167 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200168 set_nlink(inode, attr->nlink);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800169 inode->i_uid = make_kuid(&init_user_ns, attr->uid);
170 inode->i_gid = make_kgid(&init_user_ns, attr->gid);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700171 inode->i_blocks = attr->blocks;
172 inode->i_atime.tv_sec = attr->atime;
173 inode->i_atime.tv_nsec = attr->atimensec;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400174 /* mtime from server may be stale due to local buffered write */
175 if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) {
176 inode->i_mtime.tv_sec = attr->mtime;
177 inode->i_mtime.tv_nsec = attr->mtimensec;
Maxim Patlasov31f32672014-04-28 14:19:24 +0200178 inode->i_ctime.tv_sec = attr->ctime;
179 inode->i_ctime.tv_nsec = attr->ctimensec;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400180 }
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700181
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700182 if (attr->blksize != 0)
183 inode->i_blkbits = ilog2(attr->blksize);
184 else
185 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
186
Miklos Szerediebc14c42007-10-16 23:31:03 -0700187 /*
188 * Don't set the sticky bit in i_mode, unless we want the VFS
189 * to check permissions. This prevents failures due to the
190 * check in may_delete().
191 */
192 fi->orig_i_mode = inode->i_mode;
193 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
194 inode->i_mode &= ~S_ISVTX;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400195
196 fi->orig_ino = attr->ino;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700197}
198
199void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
200 u64 attr_valid, u64 attr_version)
201{
202 struct fuse_conn *fc = get_fuse_conn(inode);
203 struct fuse_inode *fi = get_fuse_inode(inode);
Pavel Emelyanov83732002013-10-10 17:10:46 +0400204 bool is_wb = fc->writeback_cache;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700205 loff_t oldsize;
Brian Fostereed21792012-07-16 15:23:49 -0400206 struct timespec old_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700207
208 spin_lock(&fc->lock);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +0400209 if ((attr_version != 0 && fi->attr_version > attr_version) ||
210 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700211 spin_unlock(&fc->lock);
212 return;
213 }
214
Brian Fostereed21792012-07-16 15:23:49 -0400215 old_mtime = inode->i_mtime;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700216 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700217
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700218 oldsize = inode->i_size;
Pavel Emelyanov83732002013-10-10 17:10:46 +0400219 /*
220 * In case of writeback_cache enabled, the cached writes beyond EOF
221 * extend local i_size without keeping userspace server in sync. So,
222 * attr->size coming from server can be stale. We cannot trust it.
223 */
224 if (!is_wb || !S_ISREG(inode->i_mode))
225 i_size_write(inode, attr->size);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700226 spin_unlock(&fc->lock);
227
Pavel Emelyanov83732002013-10-10 17:10:46 +0400228 if (!is_wb && S_ISREG(inode->i_mode)) {
Brian Fostereed21792012-07-16 15:23:49 -0400229 bool inval = false;
230
231 if (oldsize != attr->size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700232 truncate_pagecache(inode, attr->size);
Brian Fostereed21792012-07-16 15:23:49 -0400233 inval = true;
234 } else if (fc->auto_inval_data) {
235 struct timespec new_mtime = {
236 .tv_sec = attr->mtime,
237 .tv_nsec = attr->mtimensec,
238 };
239
240 /*
241 * Auto inval mode also checks and invalidates if mtime
242 * has changed.
243 */
244 if (!timespec_equal(&old_mtime, &new_mtime))
245 inval = true;
246 }
247
248 if (inval)
249 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700250 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700251}
252
253static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
254{
255 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700256 inode->i_size = attr->size;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400257 inode->i_mtime.tv_sec = attr->mtime;
258 inode->i_mtime.tv_nsec = attr->mtimensec;
Maxim Patlasov31f32672014-04-28 14:19:24 +0200259 inode->i_ctime.tv_sec = attr->ctime;
260 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700261 if (S_ISREG(inode->i_mode)) {
262 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700263 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700264 } else if (S_ISDIR(inode->i_mode))
265 fuse_init_dir(inode);
266 else if (S_ISLNK(inode->i_mode))
267 fuse_init_symlink(inode);
268 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
269 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
270 fuse_init_common(inode);
271 init_special_inode(inode, inode->i_mode,
272 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800273 } else
274 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700275}
276
John Muir3b463ae2009-05-31 11:13:57 -0400277int fuse_inode_eq(struct inode *inode, void *_nodeidp)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700278{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700279 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700280 if (get_node_id(inode) == nodeid)
281 return 1;
282 else
283 return 0;
284}
285
286static int fuse_inode_set(struct inode *inode, void *_nodeidp)
287{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700288 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700289 get_fuse_inode(inode)->nodeid = nodeid;
290 return 0;
291}
292
Miklos Szeredib48badf2008-04-30 00:54:44 -0700293struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700294 int generation, struct fuse_attr *attr,
295 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700296{
297 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700298 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700299 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700300
301 retry:
302 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
303 if (!inode)
304 return NULL;
305
306 if ((inode->i_state & I_NEW)) {
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400307 inode->i_flags |= S_NOATIME;
Maxim Patlasovd31433c2014-04-28 14:19:21 +0200308 if (!fc->writeback_cache || !S_ISREG(attr->mode))
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400309 inode->i_flags |= S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700310 inode->i_generation = generation;
311 inode->i_data.backing_dev_info = &fc->bdi;
312 fuse_init_inode(inode, attr);
313 unlock_new_inode(inode);
314 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700315 /* Inode has changed type, any I/O on the old should fail */
316 make_bad_inode(inode);
317 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700318 goto retry;
319 }
320
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700321 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700322 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100323 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700324 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700325 fuse_change_attributes(inode, attr, attr_valid, attr_version);
326
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700327 return inode;
328}
329
John Muir3b463ae2009-05-31 11:13:57 -0400330int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
331 loff_t offset, loff_t len)
332{
333 struct inode *inode;
334 pgoff_t pg_start;
335 pgoff_t pg_end;
336
337 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
338 if (!inode)
339 return -ENOENT;
340
341 fuse_invalidate_attr(inode);
342 if (offset >= 0) {
343 pg_start = offset >> PAGE_CACHE_SHIFT;
344 if (len <= 0)
345 pg_end = -1;
346 else
347 pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
348 invalidate_inode_pages2_range(inode->i_mapping,
349 pg_start, pg_end);
350 }
351 iput(inode);
352 return 0;
353}
354
Al Viro42faad92008-04-24 07:21:56 -0400355static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800356{
Al Viro42faad92008-04-24 07:21:56 -0400357 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800358}
359
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800360static void fuse_send_destroy(struct fuse_conn *fc)
361{
362 struct fuse_req *req = fc->destroy_req;
363 if (req && fc->conn_init) {
364 fc->destroy_req = NULL;
365 req->in.h.opcode = FUSE_DESTROY;
366 req->force = 1;
Maxim Patlasov8b41e672013-03-21 18:02:04 +0400367 req->background = 0;
Tejun Heob93f8582008-11-26 12:03:55 +0100368 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800369 fuse_put_request(fc, req);
370 }
371}
372
Tejun Heoa325f9b2009-04-14 10:54:52 +0900373static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700374{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900375 if (fc->bdi_initialized)
376 bdi_destroy(&fc->bdi);
377}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700378
Tejun Heo08cbf542009-04-14 10:54:53 +0900379void fuse_conn_kill(struct fuse_conn *fc)
Tejun Heoa325f9b2009-04-14 10:54:52 +0900380{
Miklos Szeredid7133112006-04-10 22:54:55 -0700381 spin_lock(&fc->lock);
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800382 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700383 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400384 fc->initialized = 1;
Miklos Szeredid7133112006-04-10 22:54:55 -0700385 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700386 /* Flush all readers on this fs */
Jeff Dike385a17b2006-04-10 22:54:52 -0700387 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700388 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700389 wake_up_all(&fc->blocked_waitq);
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700390 wake_up_all(&fc->reserved_req_waitq);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900391}
Tejun Heo08cbf542009-04-14 10:54:53 +0900392EXPORT_SYMBOL_GPL(fuse_conn_kill);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900393
394static void fuse_put_super(struct super_block *sb)
395{
396 struct fuse_conn *fc = get_fuse_conn_super(sb);
397
398 fuse_send_destroy(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200399
Tejun Heoa325f9b2009-04-14 10:54:52 +0900400 fuse_conn_kill(fc);
Miklos Szeredibbd99792012-08-30 19:24:34 +0200401 mutex_lock(&fuse_mutex);
402 list_del(&fc->entry);
403 fuse_ctl_remove_conn(fc);
404 mutex_unlock(&fuse_mutex);
405 fuse_bdi_destroy(fc);
406
Miklos Szeredibafa9652006-06-25 05:48:51 -0700407 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700408}
409
Miklos Szeredie5e55582005-09-09 13:10:28 -0700410static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
411{
412 stbuf->f_type = FUSE_SUPER_MAGIC;
413 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800414 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700415 stbuf->f_blocks = attr->blocks;
416 stbuf->f_bfree = attr->bfree;
417 stbuf->f_bavail = attr->bavail;
418 stbuf->f_files = attr->files;
419 stbuf->f_ffree = attr->ffree;
420 stbuf->f_namelen = attr->namelen;
421 /* fsid is left zero */
422}
423
David Howells726c3342006-06-23 02:02:58 -0700424static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700425{
David Howells726c3342006-06-23 02:02:58 -0700426 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700427 struct fuse_conn *fc = get_fuse_conn_super(sb);
428 struct fuse_req *req;
429 struct fuse_statfs_out outarg;
430 int err;
431
Anatol Pomozovc2132c12013-01-14 22:30:00 -0800432 if (!fuse_allow_current_process(fc)) {
Miklos Szeredie57ac682007-10-18 03:06:58 -0700433 buf->f_type = FUSE_SUPER_MAGIC;
434 return 0;
435 }
436
Maxim Patlasovb111c8c2012-10-26 19:48:30 +0400437 req = fuse_get_req_nopages(fc);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700438 if (IS_ERR(req))
439 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700440
Miklos Szeredide5f1202006-01-06 00:19:37 -0800441 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700442 req->in.numargs = 0;
443 req->in.h.opcode = FUSE_STATFS;
Miklos Szeredi5b35e8e2006-09-29 01:59:34 -0700444 req->in.h.nodeid = get_node_id(dentry->d_inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700445 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800446 req->out.args[0].size =
447 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700448 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100449 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700450 err = req->out.h.error;
451 if (!err)
452 convert_fuse_statfs(buf, &outarg.st);
453 fuse_put_request(fc, req);
454 return err;
455}
456
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700457enum {
458 OPT_FD,
459 OPT_ROOTMODE,
460 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700461 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700462 OPT_DEFAULT_PERMISSIONS,
463 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700464 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800465 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700466 OPT_ERR
467};
468
Steven Whitehousea447c092008-10-13 10:46:57 +0100469static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700470 {OPT_FD, "fd=%u"},
471 {OPT_ROOTMODE, "rootmode=%o"},
472 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700473 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700474 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
475 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700476 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800477 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700478 {OPT_ERR, NULL}
479};
480
Miklos Szeredid8091612006-12-06 20:35:48 -0800481static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700482{
483 char *p;
484 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700485 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800486 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700487
488 while ((p = strsep(&opt, ",")) != NULL) {
489 int token;
490 int value;
491 substring_t args[MAX_OPT_ARGS];
492 if (!*p)
493 continue;
494
495 token = match_token(p, tokens, args);
496 switch (token) {
497 case OPT_FD:
498 if (match_int(&args[0], &value))
499 return 0;
500 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700501 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700502 break;
503
504 case OPT_ROOTMODE:
505 if (match_octal(&args[0], &value))
506 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700507 if (!fuse_valid_type(value))
508 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700509 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700510 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700511 break;
512
513 case OPT_USER_ID:
514 if (match_int(&args[0], &value))
515 return 0;
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800516 d->user_id = make_kuid(current_user_ns(), value);
517 if (!uid_valid(d->user_id))
518 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700519 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700520 break;
521
Miklos Szeredi87729a52005-09-09 13:10:34 -0700522 case OPT_GROUP_ID:
523 if (match_int(&args[0], &value))
524 return 0;
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800525 d->group_id = make_kgid(current_user_ns(), value);
526 if (!gid_valid(d->group_id))
527 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700528 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700529 break;
530
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700531 case OPT_DEFAULT_PERMISSIONS:
532 d->flags |= FUSE_DEFAULT_PERMISSIONS;
533 break;
534
535 case OPT_ALLOW_OTHER:
536 d->flags |= FUSE_ALLOW_OTHER;
537 break;
538
Miklos Szeredidb50b962005-09-09 13:10:33 -0700539 case OPT_MAX_READ:
540 if (match_int(&args[0], &value))
541 return 0;
542 d->max_read = value;
543 break;
544
Miklos Szeredid8091612006-12-06 20:35:48 -0800545 case OPT_BLKSIZE:
546 if (!is_bdev || match_int(&args[0], &value))
547 return 0;
548 d->blksize = value;
549 break;
550
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700551 default:
552 return 0;
553 }
554 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700555
556 if (!d->fd_present || !d->rootmode_present ||
557 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700558 return 0;
559
560 return 1;
561}
562
Al Viro34c80b12011-12-08 21:32:45 -0500563static int fuse_show_options(struct seq_file *m, struct dentry *root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700564{
Al Viro34c80b12011-12-08 21:32:45 -0500565 struct super_block *sb = root->d_sb;
566 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700567
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800568 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id));
569 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id));
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700570 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
571 seq_puts(m, ",default_permissions");
572 if (fc->flags & FUSE_ALLOW_OTHER)
573 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700574 if (fc->max_read != ~0)
575 seq_printf(m, ",max_read=%u", fc->max_read);
Al Viro34c80b12011-12-08 21:32:45 -0500576 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
577 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700578 return 0;
579}
580
Tejun Heoa325f9b2009-04-14 10:54:52 +0900581void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700582{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100583 memset(fc, 0, sizeof(*fc));
584 spin_lock_init(&fc->lock);
John Muir3b463ae2009-05-31 11:13:57 -0400585 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100586 atomic_set(&fc->count, 1);
587 init_waitqueue_head(&fc->waitq);
588 init_waitqueue_head(&fc->blocked_waitq);
589 init_waitqueue_head(&fc->reserved_req_waitq);
590 INIT_LIST_HEAD(&fc->pending);
591 INIT_LIST_HEAD(&fc->processing);
592 INIT_LIST_HEAD(&fc->io);
593 INIT_LIST_HEAD(&fc->interrupts);
594 INIT_LIST_HEAD(&fc->bg_queue);
595 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100596 fc->forget_list_tail = &fc->forget_list_head;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100597 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700598 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
599 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100600 fc->khctr = 0;
601 fc->polled_files = RB_ROOT;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100602 fc->reqctr = 0;
Maxim Patlasov0aada882013-03-21 18:02:28 +0400603 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400604 fc->initialized = 0;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100605 fc->attr_version = 1;
606 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700607}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100608EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700609
Miklos Szeredibafa9652006-06-25 05:48:51 -0700610void fuse_conn_put(struct fuse_conn *fc)
611{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700612 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800613 if (fc->destroy_req)
614 fuse_request_free(fc->destroy_req);
Tejun Heo43901aa2008-11-26 12:03:56 +0100615 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700616 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700617}
Tejun Heo08cbf542009-04-14 10:54:53 +0900618EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700619
620struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
621{
622 atomic_inc(&fc->count);
623 return fc;
624}
Tejun Heo08cbf542009-04-14 10:54:53 +0900625EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700626
Tejun Heob93f8582008-11-26 12:03:55 +0100627static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700628{
629 struct fuse_attr attr;
630 memset(&attr, 0, sizeof(attr));
631
632 attr.mode = mode;
633 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700634 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700635 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700636}
637
Miklos Szeredi1729a162008-11-26 12:03:54 +0100638struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700639 u64 nodeid;
640 u32 generation;
641};
642
643static struct dentry *fuse_get_dentry(struct super_block *sb,
644 struct fuse_inode_handle *handle)
645{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700646 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700647 struct inode *inode;
648 struct dentry *entry;
649 int err = -ESTALE;
650
651 if (handle->nodeid == 0)
652 goto out_err;
653
654 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700655 if (!inode) {
656 struct fuse_entry_out outarg;
657 struct qstr name;
658
659 if (!fc->export_support)
660 goto out_err;
661
662 name.len = 1;
663 name.name = ".";
664 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
665 &inode);
666 if (err && err != -ENOENT)
667 goto out_err;
668 if (err || !inode) {
669 err = -ESTALE;
670 goto out_err;
671 }
672 err = -EIO;
673 if (get_node_id(inode) != handle->nodeid)
674 goto out_iput;
675 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700676 err = -ESTALE;
677 if (inode->i_generation != handle->generation)
678 goto out_iput;
679
Christoph Hellwig44003722008-08-11 15:49:04 +0200680 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500681 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700682 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700683
684 return entry;
685
686 out_iput:
687 iput(inode);
688 out_err:
689 return ERR_PTR(err);
690}
691
Al Virob0b03822012-04-02 14:34:06 -0400692static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
693 struct inode *parent)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700694{
Al Virob0b03822012-04-02 14:34:06 -0400695 int len = parent ? 6 : 3;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700696 u64 nodeid;
697 u32 generation;
698
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530699 if (*max_len < len) {
700 *max_len = len;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900701 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530702 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700703
704 nodeid = get_fuse_inode(inode)->nodeid;
705 generation = inode->i_generation;
706
707 fh[0] = (u32)(nodeid >> 32);
708 fh[1] = (u32)(nodeid & 0xffffffff);
709 fh[2] = generation;
710
Al Virob0b03822012-04-02 14:34:06 -0400711 if (parent) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700712 nodeid = get_fuse_inode(parent)->nodeid;
713 generation = parent->i_generation;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700714
715 fh[3] = (u32)(nodeid >> 32);
716 fh[4] = (u32)(nodeid & 0xffffffff);
717 fh[5] = generation;
718 }
719
720 *max_len = len;
Al Virob0b03822012-04-02 14:34:06 -0400721 return parent ? 0x82 : 0x81;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700722}
723
724static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
725 struct fid *fid, int fh_len, int fh_type)
726{
727 struct fuse_inode_handle handle;
728
729 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
730 return NULL;
731
732 handle.nodeid = (u64) fid->raw[0] << 32;
733 handle.nodeid |= (u64) fid->raw[1];
734 handle.generation = fid->raw[2];
735 return fuse_get_dentry(sb, &handle);
736}
737
738static struct dentry *fuse_fh_to_parent(struct super_block *sb,
739 struct fid *fid, int fh_len, int fh_type)
740{
741 struct fuse_inode_handle parent;
742
743 if (fh_type != 0x82 || fh_len < 6)
744 return NULL;
745
746 parent.nodeid = (u64) fid->raw[3] << 32;
747 parent.nodeid |= (u64) fid->raw[4];
748 parent.generation = fid->raw[5];
749 return fuse_get_dentry(sb, &parent);
750}
751
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700752static struct dentry *fuse_get_parent(struct dentry *child)
753{
754 struct inode *child_inode = child->d_inode;
755 struct fuse_conn *fc = get_fuse_conn(child_inode);
756 struct inode *inode;
757 struct dentry *parent;
758 struct fuse_entry_out outarg;
759 struct qstr name;
760 int err;
761
762 if (!fc->export_support)
763 return ERR_PTR(-ESTALE);
764
765 name.len = 2;
766 name.name = "..";
767 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
768 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200769 if (err) {
770 if (err == -ENOENT)
771 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700772 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700773 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200774
775 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500776 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700777 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700778
779 return parent;
780}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700781
782static const struct export_operations fuse_export_operations = {
783 .fh_to_dentry = fuse_fh_to_dentry,
784 .fh_to_parent = fuse_fh_to_parent,
785 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700786 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700787};
788
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800789static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700790 .alloc_inode = fuse_alloc_inode,
791 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400792 .evict_inode = fuse_evict_inode,
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200793 .write_inode = fuse_write_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700794 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700795 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700796 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800797 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700798 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700799 .show_options = fuse_show_options,
800};
801
Csaba Henk487ea5a2009-08-26 19:17:22 +0200802static void sanitize_global_limit(unsigned *limit)
803{
804 if (*limit == 0)
Jiang Liu0ed5fd12013-07-03 15:03:43 -0700805 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
Csaba Henk487ea5a2009-08-26 19:17:22 +0200806 sizeof(struct fuse_req);
807
808 if (*limit >= 1 << 16)
809 *limit = (1 << 16) - 1;
810}
811
812static int set_global_limit(const char *val, struct kernel_param *kp)
813{
814 int rv;
815
816 rv = param_set_uint(val, kp);
817 if (rv)
818 return rv;
819
820 sanitize_global_limit((unsigned *)kp->arg);
821
822 return 0;
823}
824
825static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
826{
827 int cap_sys_admin = capable(CAP_SYS_ADMIN);
828
829 if (arg->minor < 13)
830 return;
831
832 sanitize_global_limit(&max_user_bgreq);
833 sanitize_global_limit(&max_user_congthresh);
834
835 if (arg->max_background) {
836 fc->max_background = arg->max_background;
837
838 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
839 fc->max_background = max_user_bgreq;
840 }
841 if (arg->congestion_threshold) {
842 fc->congestion_threshold = arg->congestion_threshold;
843
844 if (!cap_sys_admin &&
845 fc->congestion_threshold > max_user_congthresh)
846 fc->congestion_threshold = max_user_congthresh;
847 }
848}
849
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800850static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
851{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800852 struct fuse_init_out *arg = &req->misc.init_out;
853
854 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
855 fc->conn_error = 1;
856 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800857 unsigned long ra_pages;
858
Csaba Henk487ea5a2009-08-26 19:17:22 +0200859 process_init_limits(fc, arg);
860
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800861 if (arg->minor >= 6) {
862 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
863 if (arg->flags & FUSE_ASYNC_READ)
864 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700865 if (!(arg->flags & FUSE_POSIX_LOCKS))
866 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200867 if (arg->minor >= 17) {
868 if (!(arg->flags & FUSE_FLOCK_LOCKS))
869 fc->no_flock = 1;
Miklos Szeredi24114502011-09-12 09:31:49 +0200870 } else {
871 if (!(arg->flags & FUSE_POSIX_LOCKS))
872 fc->no_flock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200873 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700874 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
875 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700876 if (arg->minor >= 9) {
877 /* LOOKUP has dependency on proto version */
878 if (arg->flags & FUSE_EXPORT_SUPPORT)
879 fc->export_support = 1;
880 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700881 if (arg->flags & FUSE_BIG_WRITES)
882 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200883 if (arg->flags & FUSE_DONT_MASK)
884 fc->dont_mask = 1;
Brian Foster72d0d242012-07-16 15:23:48 -0400885 if (arg->flags & FUSE_AUTO_INVAL_DATA)
886 fc->auto_inval_data = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200887 if (arg->flags & FUSE_DO_READDIRPLUS) {
Anand V. Avati0b05b182012-08-19 08:53:23 -0400888 fc->do_readdirplus = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200889 if (arg->flags & FUSE_READDIRPLUS_AUTO)
890 fc->readdirplus_auto = 1;
891 }
Miklos Szeredi60b9df72013-05-01 14:37:21 +0200892 if (arg->flags & FUSE_ASYNC_DIO)
893 fc->async_dio = 1;
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400894 if (arg->flags & FUSE_WRITEBACK_CACHE)
895 fc->writeback_cache = 1;
Miklos Szeredie27c9d32014-04-28 14:19:23 +0200896 if (arg->time_gran && arg->time_gran <= 1000000000)
897 fc->sb->s_time_gran = arg->time_gran;
898 else
899 fc->sb->s_time_gran = 1000000000;
900
Miklos Szeredi71421252006-06-25 05:48:52 -0700901 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800902 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700903 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200904 fc->no_flock = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700905 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800906
907 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800908 fc->minor = arg->minor;
909 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200910 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800911 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800912 }
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400913 fc->initialized = 1;
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700914 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800915}
916
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700917static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800918{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800919 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800920
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800921 arg->major = FUSE_KERNEL_VERSION;
922 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800923 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700924 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200925 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
Miklos Szeredi69fe05c2012-07-18 16:09:40 +0200926 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
Anand V. Avati0b05b182012-08-19 08:53:23 -0400927 FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400928 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
929 FUSE_WRITEBACK_CACHE;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800930 req->in.h.opcode = FUSE_INIT;
931 req->in.numargs = 1;
932 req->in.args[0].size = sizeof(*arg);
933 req->in.args[0].value = arg;
934 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800935 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800936 with interface version < 7.5. Rest of init_out is zeroed
937 by do_get_request(), so a short reply is not a problem */
938 req->out.argvar = 1;
939 req->out.args[0].size = sizeof(struct fuse_init_out);
940 req->out.args[0].value = &req->misc.init_out;
941 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100942 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800943}
944
Tejun Heo43901aa2008-11-26 12:03:56 +0100945static void fuse_free_conn(struct fuse_conn *fc)
946{
Al Virodd3e2c52013-10-03 21:21:39 -0400947 kfree_rcu(fc, rcu);
Tejun Heo43901aa2008-11-26 12:03:56 +0100948}
949
Tejun Heoa325f9b2009-04-14 10:54:52 +0900950static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
951{
952 int err;
953
Jens Axboed9938312009-06-12 14:45:52 +0200954 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900955 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900956 /* fuse does it's own writeback accounting */
Maxim Patlasov5a537482013-09-11 14:22:46 -0700957 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900958
959 err = bdi_init(&fc->bdi);
960 if (err)
961 return err;
962
963 fc->bdi_initialized = 1;
964
965 if (sb->s_bdev) {
966 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
967 MAJOR(fc->dev), MINOR(fc->dev));
968 } else {
969 err = bdi_register_dev(&fc->bdi, fc->dev);
970 }
971
972 if (err)
973 return err;
974
975 /*
976 * For a single fuse filesystem use max 1% of dirty +
977 * writeback threshold.
978 *
979 * This gives about 1M of write buffer for memory maps on a
980 * machine with 1G and 10% dirty_ratio, which should be more
981 * than enough.
982 *
983 * Privileged users can raise it by writing to
984 *
985 * /sys/class/bdi/<bdi>/max_ratio
986 */
987 bdi_set_max_ratio(&fc->bdi, 1);
988
989 return 0;
990}
991
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700992static int fuse_fill_super(struct super_block *sb, void *data, int silent)
993{
994 struct fuse_conn *fc;
995 struct inode *root;
996 struct fuse_mount_data d;
997 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800998 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700999 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001000 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -08001001 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001002
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001003 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -07001004 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001005 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -07001006
Miklos Szeredi4ace1f82014-04-28 14:19:25 +02001007 sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION);
Al Viro9e1f1de2011-06-03 18:24:58 -04001008
Miklos Szeredid8091612006-12-06 20:35:48 -08001009 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001010 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001011
Miklos Szeredid8091612006-12-06 20:35:48 -08001012 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001013#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001014 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -08001015 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001016 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001017#endif
Miklos Szeredid8091612006-12-06 20:35:48 -08001018 } else {
1019 sb->s_blocksize = PAGE_CACHE_SIZE;
1020 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1021 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001022 sb->s_magic = FUSE_SUPER_MAGIC;
1023 sb->s_op = &fuse_super_operations;
1024 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredi0a2da9b2012-04-11 11:45:06 +02001025 sb->s_time_gran = 1;
Miklos Szeredidbd561d2008-07-25 01:49:00 -07001026 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001027
1028 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001029 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001030 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001031 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001032
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001033 if ((file->f_op != &fuse_dev_operations) ||
1034 (file->f_cred->user_ns != &init_user_ns))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001035 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -07001036
Tejun Heo0d179aa2008-11-26 12:03:55 +01001037 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001038 err = -ENOMEM;
1039 if (!fc)
1040 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001041
Tejun Heoa325f9b2009-04-14 10:54:52 +09001042 fuse_conn_init(fc);
1043
1044 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -04001045 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001046 err = fuse_bdi_init(fc, sb);
1047 if (err)
1048 goto err_put_conn;
Tejun Heo0d179aa2008-11-26 12:03:55 +01001049
Jens Axboe32a88aa2009-09-16 15:02:33 +02001050 sb->s_bdi = &fc->bdi;
1051
Miklos Szeredie0a43dd2009-06-30 20:12:23 +02001052 /* Handle umasking inside the fuse code */
1053 if (sb->s_flags & MS_POSIXACL)
1054 fc->dont_mask = 1;
1055 sb->s_flags |= MS_POSIXACL;
1056
Tejun Heo43901aa2008-11-26 12:03:56 +01001057 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001058 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001059 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001060 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +02001061 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001062
Miklos Szeredif543f252006-01-16 22:14:35 -08001063 /* Used by get_root_inode() */
1064 sb->s_fs_info = fc;
1065
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001066 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +01001067 root = fuse_get_root_inode(sb, d.rootmode);
Al Viro48fde702012-01-08 22:15:13 -05001068 root_dentry = d_make_root(root);
1069 if (!root_dentry)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001070 goto err_put_conn;
Al Viroc35eebe2010-12-18 11:15:22 -05001071 /* only now - we want root dentry with NULL ->d_op */
1072 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -08001073
Maxim Patlasov4250c062012-10-26 19:48:07 +04001074 init_req = fuse_request_alloc(0);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001075 if (!init_req)
1076 goto err_put_root;
Maxim Patlasov8b41e672013-03-21 18:02:04 +04001077 init_req->background = 1;
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001078
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001079 if (is_bdev) {
Maxim Patlasov4250c062012-10-26 19:48:07 +04001080 fc->destroy_req = fuse_request_alloc(0);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001081 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001082 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001083 }
1084
Miklos Szeredibafa9652006-06-25 05:48:51 -07001085 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001086 err = -EINVAL;
1087 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001088 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001089
Miklos Szeredibafa9652006-06-25 05:48:51 -07001090 err = fuse_ctl_add_conn(fc);
1091 if (err)
1092 goto err_unlock;
1093
1094 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001095 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -08001096 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001097 file->private_data = fuse_conn_get(fc);
1098 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001099 /*
1100 * atomic_dec_and_test() in fput() provides the necessary
1101 * memory barrier for file->private_data to be visible on all
1102 * CPUs after this
1103 */
1104 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001105
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001106 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001107
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001108 return 0;
1109
Miklos Szeredibafa9652006-06-25 05:48:51 -07001110 err_unlock:
1111 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001112 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001113 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001114 err_put_root:
1115 dput(root_dentry);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001116 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001117 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001118 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001119 err_fput:
1120 fput(file);
1121 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001122 return err;
1123}
1124
Al Viro3c26ff62010-07-25 11:46:36 +04001125static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001126 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001127 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001128{
Al Viro3c26ff62010-07-25 11:46:36 +04001129 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001130}
1131
John Muir3b463ae2009-05-31 11:13:57 -04001132static void fuse_kill_sb_anon(struct super_block *sb)
1133{
1134 struct fuse_conn *fc = get_fuse_conn_super(sb);
1135
1136 if (fc) {
1137 down_write(&fc->killsb);
1138 fc->sb = NULL;
1139 up_write(&fc->killsb);
1140 }
1141
1142 kill_anon_super(sb);
1143}
1144
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001145static struct file_system_type fuse_fs_type = {
1146 .owner = THIS_MODULE,
1147 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001148 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001149 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001150 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001151};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001152MODULE_ALIAS_FS("fuse");
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001153
1154#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001155static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001156 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001157 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001158{
Al Viro152a0832010-07-25 00:46:55 +04001159 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001160}
1161
John Muir3b463ae2009-05-31 11:13:57 -04001162static void fuse_kill_sb_blk(struct super_block *sb)
1163{
1164 struct fuse_conn *fc = get_fuse_conn_super(sb);
1165
1166 if (fc) {
1167 down_write(&fc->killsb);
1168 fc->sb = NULL;
1169 up_write(&fc->killsb);
1170 }
1171
1172 kill_block_super(sb);
1173}
1174
Miklos Szeredid6392f82006-12-06 20:35:44 -08001175static struct file_system_type fuseblk_fs_type = {
1176 .owner = THIS_MODULE,
1177 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001178 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001179 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001180 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001181};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001182MODULE_ALIAS_FS("fuseblk");
Miklos Szeredid6392f82006-12-06 20:35:44 -08001183
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001184static inline int register_fuseblk(void)
1185{
1186 return register_filesystem(&fuseblk_fs_type);
1187}
1188
1189static inline void unregister_fuseblk(void)
1190{
1191 unregister_filesystem(&fuseblk_fs_type);
1192}
1193#else
1194static inline int register_fuseblk(void)
1195{
1196 return 0;
1197}
1198
1199static inline void unregister_fuseblk(void)
1200{
1201}
1202#endif
1203
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001204static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001205{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001206 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001207
Christoph Lametera35afb82007-05-16 22:10:57 -07001208 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001209}
1210
1211static int __init fuse_fs_init(void)
1212{
1213 int err;
1214
Miklos Szeredid6392f82006-12-06 20:35:44 -08001215 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1216 sizeof(struct fuse_inode),
1217 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001218 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001219 err = -ENOMEM;
1220 if (!fuse_inode_cachep)
Al Viro988f0322011-12-13 12:25:27 -05001221 goto out;
1222
1223 err = register_fuseblk();
1224 if (err)
1225 goto out2;
1226
1227 err = register_filesystem(&fuse_fs_type);
1228 if (err)
1229 goto out3;
Miklos Szeredid6392f82006-12-06 20:35:44 -08001230
1231 return 0;
1232
Al Viro988f0322011-12-13 12:25:27 -05001233 out3:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001234 unregister_fuseblk();
Al Viro988f0322011-12-13 12:25:27 -05001235 out2:
1236 kmem_cache_destroy(fuse_inode_cachep);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001237 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001238 return err;
1239}
1240
1241static void fuse_fs_cleanup(void)
1242{
1243 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001244 unregister_fuseblk();
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001245
1246 /*
1247 * Make sure all delayed rcu free inodes are flushed before we
1248 * destroy cache.
1249 */
1250 rcu_barrier();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001251 kmem_cache_destroy(fuse_inode_cachep);
1252}
1253
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001254static struct kobject *fuse_kobj;
1255static struct kobject *connections_kobj;
1256
Miklos Szeredif543f252006-01-16 22:14:35 -08001257static int fuse_sysfs_init(void)
1258{
1259 int err;
1260
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001261 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001262 if (!fuse_kobj) {
1263 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001264 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001265 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001266
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001267 connections_kobj = kobject_create_and_add("connections", fuse_kobj);
1268 if (!connections_kobj) {
1269 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001270 goto out_fuse_unregister;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001271 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001272
1273 return 0;
1274
1275 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001276 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001277 out_err:
1278 return err;
1279}
1280
1281static void fuse_sysfs_cleanup(void)
1282{
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001283 kobject_put(connections_kobj);
1284 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001285}
1286
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001287static int __init fuse_init(void)
1288{
1289 int res;
1290
Miklos Szeredi1729a162008-11-26 12:03:54 +01001291 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001292 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1293
Miklos Szeredibafa9652006-06-25 05:48:51 -07001294 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001295 res = fuse_fs_init();
1296 if (res)
1297 goto err;
1298
Miklos Szeredi334f4852005-09-09 13:10:27 -07001299 res = fuse_dev_init();
1300 if (res)
1301 goto err_fs_cleanup;
1302
Miklos Szeredif543f252006-01-16 22:14:35 -08001303 res = fuse_sysfs_init();
1304 if (res)
1305 goto err_dev_cleanup;
1306
Miklos Szeredibafa9652006-06-25 05:48:51 -07001307 res = fuse_ctl_init();
1308 if (res)
1309 goto err_sysfs_cleanup;
1310
Csaba Henk487ea5a2009-08-26 19:17:22 +02001311 sanitize_global_limit(&max_user_bgreq);
1312 sanitize_global_limit(&max_user_congthresh);
1313
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001314 return 0;
1315
Miklos Szeredibafa9652006-06-25 05:48:51 -07001316 err_sysfs_cleanup:
1317 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001318 err_dev_cleanup:
1319 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001320 err_fs_cleanup:
1321 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001322 err:
1323 return res;
1324}
1325
1326static void __exit fuse_exit(void)
1327{
1328 printk(KERN_DEBUG "fuse exit\n");
1329
Miklos Szeredibafa9652006-06-25 05:48:51 -07001330 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001331 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001332 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001333 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001334}
1335
1336module_init(fuse_init);
1337module_exit(fuse_exit);