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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 Szeredi233a01f2014-07-07 15:28:51 +0200481static int fuse_match_uint(substring_t *s, unsigned int *res)
482{
483 int err = -ENOMEM;
484 char *buf = match_strdup(s);
485 if (buf) {
486 err = kstrtouint(buf, 10, res);
487 kfree(buf);
488 }
489 return err;
490}
491
Miklos Szeredid8091612006-12-06 20:35:48 -0800492static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700493{
494 char *p;
495 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700496 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800497 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700498
499 while ((p = strsep(&opt, ",")) != NULL) {
500 int token;
501 int value;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200502 unsigned uv;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700503 substring_t args[MAX_OPT_ARGS];
504 if (!*p)
505 continue;
506
507 token = match_token(p, tokens, args);
508 switch (token) {
509 case OPT_FD:
510 if (match_int(&args[0], &value))
511 return 0;
512 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700513 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700514 break;
515
516 case OPT_ROOTMODE:
517 if (match_octal(&args[0], &value))
518 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700519 if (!fuse_valid_type(value))
520 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700521 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700522 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700523 break;
524
525 case OPT_USER_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200526 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700527 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200528 d->user_id = make_kuid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800529 if (!uid_valid(d->user_id))
530 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700531 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700532 break;
533
Miklos Szeredi87729a52005-09-09 13:10:34 -0700534 case OPT_GROUP_ID:
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200535 if (fuse_match_uint(&args[0], &uv))
Miklos Szeredi87729a52005-09-09 13:10:34 -0700536 return 0;
Miklos Szeredi233a01f2014-07-07 15:28:51 +0200537 d->group_id = make_kgid(current_user_ns(), uv);
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800538 if (!gid_valid(d->group_id))
539 return 0;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700540 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700541 break;
542
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700543 case OPT_DEFAULT_PERMISSIONS:
544 d->flags |= FUSE_DEFAULT_PERMISSIONS;
545 break;
546
547 case OPT_ALLOW_OTHER:
548 d->flags |= FUSE_ALLOW_OTHER;
549 break;
550
Miklos Szeredidb50b962005-09-09 13:10:33 -0700551 case OPT_MAX_READ:
552 if (match_int(&args[0], &value))
553 return 0;
554 d->max_read = value;
555 break;
556
Miklos Szeredid8091612006-12-06 20:35:48 -0800557 case OPT_BLKSIZE:
558 if (!is_bdev || match_int(&args[0], &value))
559 return 0;
560 d->blksize = value;
561 break;
562
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700563 default:
564 return 0;
565 }
566 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700567
568 if (!d->fd_present || !d->rootmode_present ||
569 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700570 return 0;
571
572 return 1;
573}
574
Al Viro34c80b12011-12-08 21:32:45 -0500575static int fuse_show_options(struct seq_file *m, struct dentry *root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700576{
Al Viro34c80b12011-12-08 21:32:45 -0500577 struct super_block *sb = root->d_sb;
578 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700579
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800580 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id));
581 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id));
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700582 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
583 seq_puts(m, ",default_permissions");
584 if (fc->flags & FUSE_ALLOW_OTHER)
585 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700586 if (fc->max_read != ~0)
587 seq_printf(m, ",max_read=%u", fc->max_read);
Al Viro34c80b12011-12-08 21:32:45 -0500588 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
589 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700590 return 0;
591}
592
Tejun Heoa325f9b2009-04-14 10:54:52 +0900593void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700594{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100595 memset(fc, 0, sizeof(*fc));
596 spin_lock_init(&fc->lock);
John Muir3b463ae2009-05-31 11:13:57 -0400597 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100598 atomic_set(&fc->count, 1);
599 init_waitqueue_head(&fc->waitq);
600 init_waitqueue_head(&fc->blocked_waitq);
601 init_waitqueue_head(&fc->reserved_req_waitq);
602 INIT_LIST_HEAD(&fc->pending);
603 INIT_LIST_HEAD(&fc->processing);
604 INIT_LIST_HEAD(&fc->io);
605 INIT_LIST_HEAD(&fc->interrupts);
606 INIT_LIST_HEAD(&fc->bg_queue);
607 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100608 fc->forget_list_tail = &fc->forget_list_head;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100609 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700610 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
611 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100612 fc->khctr = 0;
613 fc->polled_files = RB_ROOT;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100614 fc->reqctr = 0;
Maxim Patlasov0aada882013-03-21 18:02:28 +0400615 fc->blocked = 0;
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400616 fc->initialized = 0;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100617 fc->attr_version = 1;
618 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700619}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100620EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700621
Miklos Szeredibafa9652006-06-25 05:48:51 -0700622void fuse_conn_put(struct fuse_conn *fc)
623{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700624 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800625 if (fc->destroy_req)
626 fuse_request_free(fc->destroy_req);
Tejun Heo43901aa2008-11-26 12:03:56 +0100627 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700628 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700629}
Tejun Heo08cbf542009-04-14 10:54:53 +0900630EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700631
632struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
633{
634 atomic_inc(&fc->count);
635 return fc;
636}
Tejun Heo08cbf542009-04-14 10:54:53 +0900637EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700638
Tejun Heob93f8582008-11-26 12:03:55 +0100639static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700640{
641 struct fuse_attr attr;
642 memset(&attr, 0, sizeof(attr));
643
644 attr.mode = mode;
645 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700646 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700647 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700648}
649
Miklos Szeredi1729a162008-11-26 12:03:54 +0100650struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700651 u64 nodeid;
652 u32 generation;
653};
654
655static struct dentry *fuse_get_dentry(struct super_block *sb,
656 struct fuse_inode_handle *handle)
657{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700658 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700659 struct inode *inode;
660 struct dentry *entry;
661 int err = -ESTALE;
662
663 if (handle->nodeid == 0)
664 goto out_err;
665
666 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700667 if (!inode) {
668 struct fuse_entry_out outarg;
669 struct qstr name;
670
671 if (!fc->export_support)
672 goto out_err;
673
674 name.len = 1;
675 name.name = ".";
676 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
677 &inode);
678 if (err && err != -ENOENT)
679 goto out_err;
680 if (err || !inode) {
681 err = -ESTALE;
682 goto out_err;
683 }
684 err = -EIO;
685 if (get_node_id(inode) != handle->nodeid)
686 goto out_iput;
687 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700688 err = -ESTALE;
689 if (inode->i_generation != handle->generation)
690 goto out_iput;
691
Christoph Hellwig44003722008-08-11 15:49:04 +0200692 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500693 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700694 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700695
696 return entry;
697
698 out_iput:
699 iput(inode);
700 out_err:
701 return ERR_PTR(err);
702}
703
Al Virob0b03822012-04-02 14:34:06 -0400704static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
705 struct inode *parent)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700706{
Al Virob0b03822012-04-02 14:34:06 -0400707 int len = parent ? 6 : 3;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700708 u64 nodeid;
709 u32 generation;
710
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530711 if (*max_len < len) {
712 *max_len = len;
Namjae Jeon94e07a752013-02-17 15:48:11 +0900713 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530714 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700715
716 nodeid = get_fuse_inode(inode)->nodeid;
717 generation = inode->i_generation;
718
719 fh[0] = (u32)(nodeid >> 32);
720 fh[1] = (u32)(nodeid & 0xffffffff);
721 fh[2] = generation;
722
Al Virob0b03822012-04-02 14:34:06 -0400723 if (parent) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700724 nodeid = get_fuse_inode(parent)->nodeid;
725 generation = parent->i_generation;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700726
727 fh[3] = (u32)(nodeid >> 32);
728 fh[4] = (u32)(nodeid & 0xffffffff);
729 fh[5] = generation;
730 }
731
732 *max_len = len;
Al Virob0b03822012-04-02 14:34:06 -0400733 return parent ? 0x82 : 0x81;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700734}
735
736static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
737 struct fid *fid, int fh_len, int fh_type)
738{
739 struct fuse_inode_handle handle;
740
741 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
742 return NULL;
743
744 handle.nodeid = (u64) fid->raw[0] << 32;
745 handle.nodeid |= (u64) fid->raw[1];
746 handle.generation = fid->raw[2];
747 return fuse_get_dentry(sb, &handle);
748}
749
750static struct dentry *fuse_fh_to_parent(struct super_block *sb,
751 struct fid *fid, int fh_len, int fh_type)
752{
753 struct fuse_inode_handle parent;
754
755 if (fh_type != 0x82 || fh_len < 6)
756 return NULL;
757
758 parent.nodeid = (u64) fid->raw[3] << 32;
759 parent.nodeid |= (u64) fid->raw[4];
760 parent.generation = fid->raw[5];
761 return fuse_get_dentry(sb, &parent);
762}
763
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700764static struct dentry *fuse_get_parent(struct dentry *child)
765{
766 struct inode *child_inode = child->d_inode;
767 struct fuse_conn *fc = get_fuse_conn(child_inode);
768 struct inode *inode;
769 struct dentry *parent;
770 struct fuse_entry_out outarg;
771 struct qstr name;
772 int err;
773
774 if (!fc->export_support)
775 return ERR_PTR(-ESTALE);
776
777 name.len = 2;
778 name.name = "..";
779 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
780 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200781 if (err) {
782 if (err == -ENOENT)
783 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700784 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700785 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200786
787 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500788 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700789 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700790
791 return parent;
792}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700793
794static const struct export_operations fuse_export_operations = {
795 .fh_to_dentry = fuse_fh_to_dentry,
796 .fh_to_parent = fuse_fh_to_parent,
797 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700798 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700799};
800
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800801static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700802 .alloc_inode = fuse_alloc_inode,
803 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400804 .evict_inode = fuse_evict_inode,
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200805 .write_inode = fuse_write_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700806 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700807 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700808 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800809 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700810 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700811 .show_options = fuse_show_options,
812};
813
Csaba Henk487ea5a2009-08-26 19:17:22 +0200814static void sanitize_global_limit(unsigned *limit)
815{
816 if (*limit == 0)
Jiang Liu0ed5fd12013-07-03 15:03:43 -0700817 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
Csaba Henk487ea5a2009-08-26 19:17:22 +0200818 sizeof(struct fuse_req);
819
820 if (*limit >= 1 << 16)
821 *limit = (1 << 16) - 1;
822}
823
824static int set_global_limit(const char *val, struct kernel_param *kp)
825{
826 int rv;
827
828 rv = param_set_uint(val, kp);
829 if (rv)
830 return rv;
831
832 sanitize_global_limit((unsigned *)kp->arg);
833
834 return 0;
835}
836
837static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
838{
839 int cap_sys_admin = capable(CAP_SYS_ADMIN);
840
841 if (arg->minor < 13)
842 return;
843
844 sanitize_global_limit(&max_user_bgreq);
845 sanitize_global_limit(&max_user_congthresh);
846
847 if (arg->max_background) {
848 fc->max_background = arg->max_background;
849
850 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
851 fc->max_background = max_user_bgreq;
852 }
853 if (arg->congestion_threshold) {
854 fc->congestion_threshold = arg->congestion_threshold;
855
856 if (!cap_sys_admin &&
857 fc->congestion_threshold > max_user_congthresh)
858 fc->congestion_threshold = max_user_congthresh;
859 }
860}
861
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800862static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
863{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800864 struct fuse_init_out *arg = &req->misc.init_out;
865
866 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
867 fc->conn_error = 1;
868 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800869 unsigned long ra_pages;
870
Csaba Henk487ea5a2009-08-26 19:17:22 +0200871 process_init_limits(fc, arg);
872
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800873 if (arg->minor >= 6) {
874 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
875 if (arg->flags & FUSE_ASYNC_READ)
876 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700877 if (!(arg->flags & FUSE_POSIX_LOCKS))
878 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200879 if (arg->minor >= 17) {
880 if (!(arg->flags & FUSE_FLOCK_LOCKS))
881 fc->no_flock = 1;
Miklos Szeredi24114502011-09-12 09:31:49 +0200882 } else {
883 if (!(arg->flags & FUSE_POSIX_LOCKS))
884 fc->no_flock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200885 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700886 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
887 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700888 if (arg->minor >= 9) {
889 /* LOOKUP has dependency on proto version */
890 if (arg->flags & FUSE_EXPORT_SUPPORT)
891 fc->export_support = 1;
892 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700893 if (arg->flags & FUSE_BIG_WRITES)
894 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200895 if (arg->flags & FUSE_DONT_MASK)
896 fc->dont_mask = 1;
Brian Foster72d0d242012-07-16 15:23:48 -0400897 if (arg->flags & FUSE_AUTO_INVAL_DATA)
898 fc->auto_inval_data = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200899 if (arg->flags & FUSE_DO_READDIRPLUS) {
Anand V. Avati0b05b182012-08-19 08:53:23 -0400900 fc->do_readdirplus = 1;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200901 if (arg->flags & FUSE_READDIRPLUS_AUTO)
902 fc->readdirplus_auto = 1;
903 }
Miklos Szeredi60b9df72013-05-01 14:37:21 +0200904 if (arg->flags & FUSE_ASYNC_DIO)
905 fc->async_dio = 1;
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400906 if (arg->flags & FUSE_WRITEBACK_CACHE)
907 fc->writeback_cache = 1;
Miklos Szeredie27c9d32014-04-28 14:19:23 +0200908 if (arg->time_gran && arg->time_gran <= 1000000000)
909 fc->sb->s_time_gran = arg->time_gran;
Miklos Szeredi71421252006-06-25 05:48:52 -0700910 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800911 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700912 fc->no_lock = 1;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200913 fc->no_flock = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700914 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800915
916 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800917 fc->minor = arg->minor;
918 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200919 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800920 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800921 }
Maxim Patlasov796523fb2013-03-21 18:02:15 +0400922 fc->initialized = 1;
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700923 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800924}
925
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700926static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800927{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800928 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800929
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800930 arg->major = FUSE_KERNEL_VERSION;
931 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800932 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700933 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200934 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
Miklos Szeredi69fe05c2012-07-18 16:09:40 +0200935 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
Anand V. Avati0b05b182012-08-19 08:53:23 -0400936 FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400937 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
Andrew Gallagherd7afaec2014-07-22 16:37:43 +0200938 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800939 req->in.h.opcode = FUSE_INIT;
940 req->in.numargs = 1;
941 req->in.args[0].size = sizeof(*arg);
942 req->in.args[0].value = arg;
943 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800944 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800945 with interface version < 7.5. Rest of init_out is zeroed
946 by do_get_request(), so a short reply is not a problem */
947 req->out.argvar = 1;
948 req->out.args[0].size = sizeof(struct fuse_init_out);
949 req->out.args[0].value = &req->misc.init_out;
950 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100951 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800952}
953
Tejun Heo43901aa2008-11-26 12:03:56 +0100954static void fuse_free_conn(struct fuse_conn *fc)
955{
Al Virodd3e2c52013-10-03 21:21:39 -0400956 kfree_rcu(fc, rcu);
Tejun Heo43901aa2008-11-26 12:03:56 +0100957}
958
Tejun Heoa325f9b2009-04-14 10:54:52 +0900959static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
960{
961 int err;
962
Jens Axboed9938312009-06-12 14:45:52 +0200963 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900964 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900965 /* fuse does it's own writeback accounting */
Maxim Patlasov5a537482013-09-11 14:22:46 -0700966 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900967
968 err = bdi_init(&fc->bdi);
969 if (err)
970 return err;
971
972 fc->bdi_initialized = 1;
973
974 if (sb->s_bdev) {
975 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
976 MAJOR(fc->dev), MINOR(fc->dev));
977 } else {
978 err = bdi_register_dev(&fc->bdi, fc->dev);
979 }
980
981 if (err)
982 return err;
983
984 /*
985 * For a single fuse filesystem use max 1% of dirty +
986 * writeback threshold.
987 *
988 * This gives about 1M of write buffer for memory maps on a
989 * machine with 1G and 10% dirty_ratio, which should be more
990 * than enough.
991 *
992 * Privileged users can raise it by writing to
993 *
994 * /sys/class/bdi/<bdi>/max_ratio
995 */
996 bdi_set_max_ratio(&fc->bdi, 1);
997
998 return 0;
999}
1000
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001001static int fuse_fill_super(struct super_block *sb, void *data, int silent)
1002{
1003 struct fuse_conn *fc;
1004 struct inode *root;
1005 struct fuse_mount_data d;
1006 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -08001007 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001008 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001009 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -08001010 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001011
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001012 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -07001013 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001014 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -07001015
Miklos Szeredi4ace1f82014-04-28 14:19:25 +02001016 sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION);
Al Viro9e1f1de2011-06-03 18:24:58 -04001017
Himangi Saraogi7b3d8bf2014-06-26 23:06:52 +05301018 if (!parse_fuse_opt(data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001019 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001020
Miklos Szeredid8091612006-12-06 20:35:48 -08001021 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001022#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001023 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -08001024 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001025 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001026#endif
Miklos Szeredid8091612006-12-06 20:35:48 -08001027 } else {
1028 sb->s_blocksize = PAGE_CACHE_SIZE;
1029 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1030 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001031 sb->s_magic = FUSE_SUPER_MAGIC;
1032 sb->s_op = &fuse_super_operations;
1033 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredi0a2da9b2012-04-11 11:45:06 +02001034 sb->s_time_gran = 1;
Miklos Szeredidbd561d2008-07-25 01:49:00 -07001035 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001036
1037 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001038 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001039 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001040 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001041
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001042 if ((file->f_op != &fuse_dev_operations) ||
1043 (file->f_cred->user_ns != &init_user_ns))
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001044 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -07001045
Tejun Heo0d179aa2008-11-26 12:03:55 +01001046 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001047 err = -ENOMEM;
1048 if (!fc)
1049 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001050
Tejun Heoa325f9b2009-04-14 10:54:52 +09001051 fuse_conn_init(fc);
1052
1053 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -04001054 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +09001055 err = fuse_bdi_init(fc, sb);
1056 if (err)
1057 goto err_put_conn;
Tejun Heo0d179aa2008-11-26 12:03:55 +01001058
Jens Axboe32a88aa2009-09-16 15:02:33 +02001059 sb->s_bdi = &fc->bdi;
1060
Miklos Szeredie0a43dd2009-06-30 20:12:23 +02001061 /* Handle umasking inside the fuse code */
1062 if (sb->s_flags & MS_POSIXACL)
1063 fc->dont_mask = 1;
1064 sb->s_flags |= MS_POSIXACL;
1065
Tejun Heo43901aa2008-11-26 12:03:56 +01001066 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001067 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001068 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001069 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +02001070 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001071
Miklos Szeredif543f252006-01-16 22:14:35 -08001072 /* Used by get_root_inode() */
1073 sb->s_fs_info = fc;
1074
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001075 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +01001076 root = fuse_get_root_inode(sb, d.rootmode);
Al Viro48fde702012-01-08 22:15:13 -05001077 root_dentry = d_make_root(root);
1078 if (!root_dentry)
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001079 goto err_put_conn;
Al Viroc35eebe2010-12-18 11:15:22 -05001080 /* only now - we want root dentry with NULL ->d_op */
1081 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -08001082
Maxim Patlasov4250c062012-10-26 19:48:07 +04001083 init_req = fuse_request_alloc(0);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001084 if (!init_req)
1085 goto err_put_root;
Maxim Patlasov8b41e672013-03-21 18:02:04 +04001086 init_req->background = 1;
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001087
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001088 if (is_bdev) {
Maxim Patlasov4250c062012-10-26 19:48:07 +04001089 fc->destroy_req = fuse_request_alloc(0);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001090 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001091 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001092 }
1093
Miklos Szeredibafa9652006-06-25 05:48:51 -07001094 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001095 err = -EINVAL;
1096 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001097 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001098
Miklos Szeredibafa9652006-06-25 05:48:51 -07001099 err = fuse_ctl_add_conn(fc);
1100 if (err)
1101 goto err_unlock;
1102
1103 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001104 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -08001105 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001106 file->private_data = fuse_conn_get(fc);
1107 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001108 /*
1109 * atomic_dec_and_test() in fput() provides the necessary
1110 * memory barrier for file->private_data to be visible on all
1111 * CPUs after this
1112 */
1113 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001114
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001115 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001116
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001117 return 0;
1118
Miklos Szeredibafa9652006-06-25 05:48:51 -07001119 err_unlock:
1120 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001121 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001122 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001123 err_put_root:
1124 dput(root_dentry);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001125 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001126 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001127 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001128 err_fput:
1129 fput(file);
1130 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001131 return err;
1132}
1133
Al Viro3c26ff62010-07-25 11:46:36 +04001134static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001135 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001136 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001137{
Al Viro3c26ff62010-07-25 11:46:36 +04001138 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001139}
1140
John Muir3b463ae2009-05-31 11:13:57 -04001141static void fuse_kill_sb_anon(struct super_block *sb)
1142{
1143 struct fuse_conn *fc = get_fuse_conn_super(sb);
1144
1145 if (fc) {
1146 down_write(&fc->killsb);
1147 fc->sb = NULL;
1148 up_write(&fc->killsb);
1149 }
1150
1151 kill_anon_super(sb);
1152}
1153
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001154static struct file_system_type fuse_fs_type = {
1155 .owner = THIS_MODULE,
1156 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001157 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001158 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001159 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001160};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001161MODULE_ALIAS_FS("fuse");
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001162
1163#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001164static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001165 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001166 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001167{
Al Viro152a0832010-07-25 00:46:55 +04001168 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001169}
1170
John Muir3b463ae2009-05-31 11:13:57 -04001171static void fuse_kill_sb_blk(struct super_block *sb)
1172{
1173 struct fuse_conn *fc = get_fuse_conn_super(sb);
1174
1175 if (fc) {
1176 down_write(&fc->killsb);
1177 fc->sb = NULL;
1178 up_write(&fc->killsb);
1179 }
1180
1181 kill_block_super(sb);
1182}
1183
Miklos Szeredid6392f82006-12-06 20:35:44 -08001184static struct file_system_type fuseblk_fs_type = {
1185 .owner = THIS_MODULE,
1186 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001187 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001188 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001189 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001190};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001191MODULE_ALIAS_FS("fuseblk");
Miklos Szeredid6392f82006-12-06 20:35:44 -08001192
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001193static inline int register_fuseblk(void)
1194{
1195 return register_filesystem(&fuseblk_fs_type);
1196}
1197
1198static inline void unregister_fuseblk(void)
1199{
1200 unregister_filesystem(&fuseblk_fs_type);
1201}
1202#else
1203static inline int register_fuseblk(void)
1204{
1205 return 0;
1206}
1207
1208static inline void unregister_fuseblk(void)
1209{
1210}
1211#endif
1212
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001213static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001214{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001215 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001216
Christoph Lametera35afb82007-05-16 22:10:57 -07001217 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001218}
1219
1220static int __init fuse_fs_init(void)
1221{
1222 int err;
1223
Miklos Szeredid6392f82006-12-06 20:35:44 -08001224 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1225 sizeof(struct fuse_inode),
1226 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001227 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001228 err = -ENOMEM;
1229 if (!fuse_inode_cachep)
Al Viro988f0322011-12-13 12:25:27 -05001230 goto out;
1231
1232 err = register_fuseblk();
1233 if (err)
1234 goto out2;
1235
1236 err = register_filesystem(&fuse_fs_type);
1237 if (err)
1238 goto out3;
Miklos Szeredid6392f82006-12-06 20:35:44 -08001239
1240 return 0;
1241
Al Viro988f0322011-12-13 12:25:27 -05001242 out3:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001243 unregister_fuseblk();
Al Viro988f0322011-12-13 12:25:27 -05001244 out2:
1245 kmem_cache_destroy(fuse_inode_cachep);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001246 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001247 return err;
1248}
1249
1250static void fuse_fs_cleanup(void)
1251{
1252 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001253 unregister_fuseblk();
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001254
1255 /*
1256 * Make sure all delayed rcu free inodes are flushed before we
1257 * destroy cache.
1258 */
1259 rcu_barrier();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001260 kmem_cache_destroy(fuse_inode_cachep);
1261}
1262
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001263static struct kobject *fuse_kobj;
1264static struct kobject *connections_kobj;
1265
Miklos Szeredif543f252006-01-16 22:14:35 -08001266static int fuse_sysfs_init(void)
1267{
1268 int err;
1269
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001270 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001271 if (!fuse_kobj) {
1272 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001273 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001274 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001275
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001276 connections_kobj = kobject_create_and_add("connections", fuse_kobj);
1277 if (!connections_kobj) {
1278 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001279 goto out_fuse_unregister;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001280 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001281
1282 return 0;
1283
1284 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001285 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001286 out_err:
1287 return err;
1288}
1289
1290static void fuse_sysfs_cleanup(void)
1291{
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001292 kobject_put(connections_kobj);
1293 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001294}
1295
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001296static int __init fuse_init(void)
1297{
1298 int res;
1299
Miklos Szeredi1729a162008-11-26 12:03:54 +01001300 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001301 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1302
Miklos Szeredibafa9652006-06-25 05:48:51 -07001303 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001304 res = fuse_fs_init();
1305 if (res)
1306 goto err;
1307
Miklos Szeredi334f4852005-09-09 13:10:27 -07001308 res = fuse_dev_init();
1309 if (res)
1310 goto err_fs_cleanup;
1311
Miklos Szeredif543f252006-01-16 22:14:35 -08001312 res = fuse_sysfs_init();
1313 if (res)
1314 goto err_dev_cleanup;
1315
Miklos Szeredibafa9652006-06-25 05:48:51 -07001316 res = fuse_ctl_init();
1317 if (res)
1318 goto err_sysfs_cleanup;
1319
Csaba Henk487ea5a2009-08-26 19:17:22 +02001320 sanitize_global_limit(&max_user_bgreq);
1321 sanitize_global_limit(&max_user_congthresh);
1322
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001323 return 0;
1324
Miklos Szeredibafa9652006-06-25 05:48:51 -07001325 err_sysfs_cleanup:
1326 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001327 err_dev_cleanup:
1328 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001329 err_fs_cleanup:
1330 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001331 err:
1332 return res;
1333}
1334
1335static void __exit fuse_exit(void)
1336{
1337 printk(KERN_DEBUG "fuse exit\n");
1338
Miklos Szeredibafa9652006-06-25 05:48:51 -07001339 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001340 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001341 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001342 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001343}
1344
1345module_init(fuse_init);
1346module_exit(fuse_exit);