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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;
63 unsigned user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -070064 unsigned 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
Miklos Szeredi07e77dc2010-12-07 20:16:56 +010074struct fuse_forget_link *fuse_alloc_forget()
75{
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;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070094 INIT_LIST_HEAD(&fi->write_files);
Miklos Szeredi3be5a522008-04-30 00:54:41 -070095 INIT_LIST_HEAD(&fi->queued_writes);
96 INIT_LIST_HEAD(&fi->writepages);
97 init_waitqueue_head(&fi->page_waitq);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +010098 fi->forget = fuse_alloc_forget();
99 if (!fi->forget) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700100 kmem_cache_free(fuse_inode_cachep, inode);
101 return NULL;
102 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700103
104 return inode;
105}
106
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100107static void fuse_i_callback(struct rcu_head *head)
108{
109 struct inode *inode = container_of(head, struct inode, i_rcu);
110 INIT_LIST_HEAD(&inode->i_dentry);
111 kmem_cache_free(fuse_inode_cachep, inode);
112}
113
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700114static void fuse_destroy_inode(struct inode *inode)
115{
Miklos Szeredie5e55582005-09-09 13:10:28 -0700116 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700117 BUG_ON(!list_empty(&fi->write_files));
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700118 BUG_ON(!list_empty(&fi->queued_writes));
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100119 kfree(fi->forget);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100120 call_rcu(&inode->i_rcu, fuse_i_callback);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700121}
122
Al Virob57922d2010-06-07 14:34:48 -0400123static void fuse_evict_inode(struct inode *inode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700124{
Al Virob57922d2010-06-07 14:34:48 -0400125 truncate_inode_pages(&inode->i_data, 0);
126 end_writeback(inode);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700127 if (inode->i_sb->s_flags & MS_ACTIVE) {
128 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700129 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100130 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
131 fi->forget = NULL;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700132 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700133}
134
Miklos Szeredi71421252006-06-25 05:48:52 -0700135static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
136{
137 if (*flags & MS_MANDLOCK)
138 return -EINVAL;
139
140 return 0;
141}
142
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700143void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
144 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700145{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700146 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700147 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700148
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700149 fi->attr_version = ++fc->attr_version;
150 fi->i_time = attr_valid;
151
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700152 inode->i_ino = attr->ino;
Miklos Szerediebc14c42007-10-16 23:31:03 -0700153 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700154 inode->i_nlink = attr->nlink;
155 inode->i_uid = attr->uid;
156 inode->i_gid = attr->gid;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700157 inode->i_blocks = attr->blocks;
158 inode->i_atime.tv_sec = attr->atime;
159 inode->i_atime.tv_nsec = attr->atimensec;
160 inode->i_mtime.tv_sec = attr->mtime;
161 inode->i_mtime.tv_nsec = attr->mtimensec;
162 inode->i_ctime.tv_sec = attr->ctime;
163 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700164
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700165 if (attr->blksize != 0)
166 inode->i_blkbits = ilog2(attr->blksize);
167 else
168 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
169
Miklos Szerediebc14c42007-10-16 23:31:03 -0700170 /*
171 * Don't set the sticky bit in i_mode, unless we want the VFS
172 * to check permissions. This prevents failures due to the
173 * check in may_delete().
174 */
175 fi->orig_i_mode = inode->i_mode;
176 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
177 inode->i_mode &= ~S_ISVTX;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700178}
179
180void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
181 u64 attr_valid, u64 attr_version)
182{
183 struct fuse_conn *fc = get_fuse_conn(inode);
184 struct fuse_inode *fi = get_fuse_inode(inode);
185 loff_t oldsize;
186
187 spin_lock(&fc->lock);
188 if (attr_version != 0 && fi->attr_version > attr_version) {
189 spin_unlock(&fc->lock);
190 return;
191 }
192
193 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700194
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700195 oldsize = inode->i_size;
196 i_size_write(inode, attr->size);
197 spin_unlock(&fc->lock);
198
199 if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
npiggin@suse.dec08d3b02009-08-21 02:35:06 +1000200 truncate_pagecache(inode, oldsize, attr->size);
Miklos Szeredib1009972007-10-16 23:31:01 -0700201 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700202 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700203}
204
205static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
206{
207 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700208 inode->i_size = attr->size;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700209 if (S_ISREG(inode->i_mode)) {
210 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700211 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700212 } else if (S_ISDIR(inode->i_mode))
213 fuse_init_dir(inode);
214 else if (S_ISLNK(inode->i_mode))
215 fuse_init_symlink(inode);
216 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
217 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
218 fuse_init_common(inode);
219 init_special_inode(inode, inode->i_mode,
220 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800221 } else
222 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700223}
224
John Muir3b463ae2009-05-31 11:13:57 -0400225int fuse_inode_eq(struct inode *inode, void *_nodeidp)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700226{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700227 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700228 if (get_node_id(inode) == nodeid)
229 return 1;
230 else
231 return 0;
232}
233
234static int fuse_inode_set(struct inode *inode, void *_nodeidp)
235{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700236 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700237 get_fuse_inode(inode)->nodeid = nodeid;
238 return 0;
239}
240
Miklos Szeredib48badf2008-04-30 00:54:44 -0700241struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700242 int generation, struct fuse_attr *attr,
243 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700244{
245 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700246 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700247 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700248
249 retry:
250 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
251 if (!inode)
252 return NULL;
253
254 if ((inode->i_state & I_NEW)) {
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700255 inode->i_flags |= S_NOATIME|S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700256 inode->i_generation = generation;
257 inode->i_data.backing_dev_info = &fc->bdi;
258 fuse_init_inode(inode, attr);
259 unlock_new_inode(inode);
260 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700261 /* Inode has changed type, any I/O on the old should fail */
262 make_bad_inode(inode);
263 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700264 goto retry;
265 }
266
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700267 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700268 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100269 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700270 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700271 fuse_change_attributes(inode, attr, attr_valid, attr_version);
272
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700273 return inode;
274}
275
John Muir3b463ae2009-05-31 11:13:57 -0400276int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
277 loff_t offset, loff_t len)
278{
279 struct inode *inode;
280 pgoff_t pg_start;
281 pgoff_t pg_end;
282
283 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
284 if (!inode)
285 return -ENOENT;
286
287 fuse_invalidate_attr(inode);
288 if (offset >= 0) {
289 pg_start = offset >> PAGE_CACHE_SHIFT;
290 if (len <= 0)
291 pg_end = -1;
292 else
293 pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
294 invalidate_inode_pages2_range(inode->i_mapping,
295 pg_start, pg_end);
296 }
297 iput(inode);
298 return 0;
299}
300
Al Viro42faad92008-04-24 07:21:56 -0400301static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800302{
Al Viro42faad92008-04-24 07:21:56 -0400303 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800304}
305
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800306static void fuse_send_destroy(struct fuse_conn *fc)
307{
308 struct fuse_req *req = fc->destroy_req;
309 if (req && fc->conn_init) {
310 fc->destroy_req = NULL;
311 req->in.h.opcode = FUSE_DESTROY;
312 req->force = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100313 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800314 fuse_put_request(fc, req);
315 }
316}
317
Tejun Heoa325f9b2009-04-14 10:54:52 +0900318static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700319{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900320 if (fc->bdi_initialized)
321 bdi_destroy(&fc->bdi);
322}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700323
Tejun Heo08cbf542009-04-14 10:54:53 +0900324void fuse_conn_kill(struct fuse_conn *fc)
Tejun Heoa325f9b2009-04-14 10:54:52 +0900325{
Miklos Szeredid7133112006-04-10 22:54:55 -0700326 spin_lock(&fc->lock);
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800327 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700328 fc->blocked = 0;
Miklos Szeredid7133112006-04-10 22:54:55 -0700329 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700330 /* Flush all readers on this fs */
Jeff Dike385a17b2006-04-10 22:54:52 -0700331 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700332 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700333 wake_up_all(&fc->blocked_waitq);
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700334 wake_up_all(&fc->reserved_req_waitq);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700335 mutex_lock(&fuse_mutex);
336 list_del(&fc->entry);
337 fuse_ctl_remove_conn(fc);
338 mutex_unlock(&fuse_mutex);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900339 fuse_bdi_destroy(fc);
340}
Tejun Heo08cbf542009-04-14 10:54:53 +0900341EXPORT_SYMBOL_GPL(fuse_conn_kill);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900342
343static void fuse_put_super(struct super_block *sb)
344{
345 struct fuse_conn *fc = get_fuse_conn_super(sb);
346
347 fuse_send_destroy(fc);
348 fuse_conn_kill(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700349 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700350}
351
Miklos Szeredie5e55582005-09-09 13:10:28 -0700352static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
353{
354 stbuf->f_type = FUSE_SUPER_MAGIC;
355 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800356 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700357 stbuf->f_blocks = attr->blocks;
358 stbuf->f_bfree = attr->bfree;
359 stbuf->f_bavail = attr->bavail;
360 stbuf->f_files = attr->files;
361 stbuf->f_ffree = attr->ffree;
362 stbuf->f_namelen = attr->namelen;
363 /* fsid is left zero */
364}
365
David Howells726c3342006-06-23 02:02:58 -0700366static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700367{
David Howells726c3342006-06-23 02:02:58 -0700368 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700369 struct fuse_conn *fc = get_fuse_conn_super(sb);
370 struct fuse_req *req;
371 struct fuse_statfs_out outarg;
372 int err;
373
Miklos Szeredie57ac682007-10-18 03:06:58 -0700374 if (!fuse_allow_task(fc, current)) {
375 buf->f_type = FUSE_SUPER_MAGIC;
376 return 0;
377 }
378
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700379 req = fuse_get_req(fc);
380 if (IS_ERR(req))
381 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700382
Miklos Szeredide5f1202006-01-06 00:19:37 -0800383 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700384 req->in.numargs = 0;
385 req->in.h.opcode = FUSE_STATFS;
Miklos Szeredi5b35e8e2006-09-29 01:59:34 -0700386 req->in.h.nodeid = get_node_id(dentry->d_inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700387 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800388 req->out.args[0].size =
389 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700390 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100391 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700392 err = req->out.h.error;
393 if (!err)
394 convert_fuse_statfs(buf, &outarg.st);
395 fuse_put_request(fc, req);
396 return err;
397}
398
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700399enum {
400 OPT_FD,
401 OPT_ROOTMODE,
402 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700403 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700404 OPT_DEFAULT_PERMISSIONS,
405 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700406 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800407 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700408 OPT_ERR
409};
410
Steven Whitehousea447c092008-10-13 10:46:57 +0100411static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700412 {OPT_FD, "fd=%u"},
413 {OPT_ROOTMODE, "rootmode=%o"},
414 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700415 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700416 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
417 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700418 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800419 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700420 {OPT_ERR, NULL}
421};
422
Miklos Szeredid8091612006-12-06 20:35:48 -0800423static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700424{
425 char *p;
426 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700427 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800428 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700429
430 while ((p = strsep(&opt, ",")) != NULL) {
431 int token;
432 int value;
433 substring_t args[MAX_OPT_ARGS];
434 if (!*p)
435 continue;
436
437 token = match_token(p, tokens, args);
438 switch (token) {
439 case OPT_FD:
440 if (match_int(&args[0], &value))
441 return 0;
442 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700443 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700444 break;
445
446 case OPT_ROOTMODE:
447 if (match_octal(&args[0], &value))
448 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700449 if (!fuse_valid_type(value))
450 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700451 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700452 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700453 break;
454
455 case OPT_USER_ID:
456 if (match_int(&args[0], &value))
457 return 0;
458 d->user_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700459 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700460 break;
461
Miklos Szeredi87729a52005-09-09 13:10:34 -0700462 case OPT_GROUP_ID:
463 if (match_int(&args[0], &value))
464 return 0;
465 d->group_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700466 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700467 break;
468
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700469 case OPT_DEFAULT_PERMISSIONS:
470 d->flags |= FUSE_DEFAULT_PERMISSIONS;
471 break;
472
473 case OPT_ALLOW_OTHER:
474 d->flags |= FUSE_ALLOW_OTHER;
475 break;
476
Miklos Szeredidb50b962005-09-09 13:10:33 -0700477 case OPT_MAX_READ:
478 if (match_int(&args[0], &value))
479 return 0;
480 d->max_read = value;
481 break;
482
Miklos Szeredid8091612006-12-06 20:35:48 -0800483 case OPT_BLKSIZE:
484 if (!is_bdev || match_int(&args[0], &value))
485 return 0;
486 d->blksize = value;
487 break;
488
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700489 default:
490 return 0;
491 }
492 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700493
494 if (!d->fd_present || !d->rootmode_present ||
495 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700496 return 0;
497
498 return 1;
499}
500
501static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
502{
503 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
504
505 seq_printf(m, ",user_id=%u", fc->user_id);
Miklos Szeredi87729a52005-09-09 13:10:34 -0700506 seq_printf(m, ",group_id=%u", fc->group_id);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700507 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
508 seq_puts(m, ",default_permissions");
509 if (fc->flags & FUSE_ALLOW_OTHER)
510 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700511 if (fc->max_read != ~0)
512 seq_printf(m, ",max_read=%u", fc->max_read);
Miklos Szeredid1875db2008-02-08 04:21:43 -0800513 if (mnt->mnt_sb->s_bdev &&
514 mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
515 seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700516 return 0;
517}
518
Tejun Heoa325f9b2009-04-14 10:54:52 +0900519void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700520{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100521 memset(fc, 0, sizeof(*fc));
522 spin_lock_init(&fc->lock);
523 mutex_init(&fc->inst_mutex);
John Muir3b463ae2009-05-31 11:13:57 -0400524 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100525 atomic_set(&fc->count, 1);
526 init_waitqueue_head(&fc->waitq);
527 init_waitqueue_head(&fc->blocked_waitq);
528 init_waitqueue_head(&fc->reserved_req_waitq);
529 INIT_LIST_HEAD(&fc->pending);
530 INIT_LIST_HEAD(&fc->processing);
531 INIT_LIST_HEAD(&fc->io);
532 INIT_LIST_HEAD(&fc->interrupts);
533 INIT_LIST_HEAD(&fc->bg_queue);
534 INIT_LIST_HEAD(&fc->entry);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100535 fc->forget_list_tail = &fc->forget_list_head;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100536 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700537 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
538 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100539 fc->khctr = 0;
540 fc->polled_files = RB_ROOT;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100541 fc->reqctr = 0;
542 fc->blocked = 1;
543 fc->attr_version = 1;
544 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700545}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100546EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700547
Miklos Szeredibafa9652006-06-25 05:48:51 -0700548void fuse_conn_put(struct fuse_conn *fc)
549{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700550 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800551 if (fc->destroy_req)
552 fuse_request_free(fc->destroy_req);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700553 mutex_destroy(&fc->inst_mutex);
Tejun Heo43901aa2008-11-26 12:03:56 +0100554 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700555 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700556}
Tejun Heo08cbf542009-04-14 10:54:53 +0900557EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700558
559struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
560{
561 atomic_inc(&fc->count);
562 return fc;
563}
Tejun Heo08cbf542009-04-14 10:54:53 +0900564EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700565
Tejun Heob93f8582008-11-26 12:03:55 +0100566static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700567{
568 struct fuse_attr attr;
569 memset(&attr, 0, sizeof(attr));
570
571 attr.mode = mode;
572 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700573 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700574 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700575}
576
Miklos Szeredi1729a162008-11-26 12:03:54 +0100577struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700578 u64 nodeid;
579 u32 generation;
580};
581
582static struct dentry *fuse_get_dentry(struct super_block *sb,
583 struct fuse_inode_handle *handle)
584{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700585 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700586 struct inode *inode;
587 struct dentry *entry;
588 int err = -ESTALE;
589
590 if (handle->nodeid == 0)
591 goto out_err;
592
593 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700594 if (!inode) {
595 struct fuse_entry_out outarg;
596 struct qstr name;
597
598 if (!fc->export_support)
599 goto out_err;
600
601 name.len = 1;
602 name.name = ".";
603 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
604 &inode);
605 if (err && err != -ENOENT)
606 goto out_err;
607 if (err || !inode) {
608 err = -ESTALE;
609 goto out_err;
610 }
611 err = -EIO;
612 if (get_node_id(inode) != handle->nodeid)
613 goto out_iput;
614 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700615 err = -ESTALE;
616 if (inode->i_generation != handle->generation)
617 goto out_iput;
618
Christoph Hellwig44003722008-08-11 15:49:04 +0200619 entry = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500620 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700621 fuse_invalidate_entry_cache(entry);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700622
623 return entry;
624
625 out_iput:
626 iput(inode);
627 out_err:
628 return ERR_PTR(err);
629}
630
631static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
632 int connectable)
633{
634 struct inode *inode = dentry->d_inode;
635 bool encode_parent = connectable && !S_ISDIR(inode->i_mode);
636 int len = encode_parent ? 6 : 3;
637 u64 nodeid;
638 u32 generation;
639
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530640 if (*max_len < len) {
641 *max_len = len;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700642 return 255;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +0530643 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700644
645 nodeid = get_fuse_inode(inode)->nodeid;
646 generation = inode->i_generation;
647
648 fh[0] = (u32)(nodeid >> 32);
649 fh[1] = (u32)(nodeid & 0xffffffff);
650 fh[2] = generation;
651
652 if (encode_parent) {
653 struct inode *parent;
654
655 spin_lock(&dentry->d_lock);
656 parent = dentry->d_parent->d_inode;
657 nodeid = get_fuse_inode(parent)->nodeid;
658 generation = parent->i_generation;
659 spin_unlock(&dentry->d_lock);
660
661 fh[3] = (u32)(nodeid >> 32);
662 fh[4] = (u32)(nodeid & 0xffffffff);
663 fh[5] = generation;
664 }
665
666 *max_len = len;
667 return encode_parent ? 0x82 : 0x81;
668}
669
670static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
671 struct fid *fid, int fh_len, int fh_type)
672{
673 struct fuse_inode_handle handle;
674
675 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
676 return NULL;
677
678 handle.nodeid = (u64) fid->raw[0] << 32;
679 handle.nodeid |= (u64) fid->raw[1];
680 handle.generation = fid->raw[2];
681 return fuse_get_dentry(sb, &handle);
682}
683
684static struct dentry *fuse_fh_to_parent(struct super_block *sb,
685 struct fid *fid, int fh_len, int fh_type)
686{
687 struct fuse_inode_handle parent;
688
689 if (fh_type != 0x82 || fh_len < 6)
690 return NULL;
691
692 parent.nodeid = (u64) fid->raw[3] << 32;
693 parent.nodeid |= (u64) fid->raw[4];
694 parent.generation = fid->raw[5];
695 return fuse_get_dentry(sb, &parent);
696}
697
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700698static struct dentry *fuse_get_parent(struct dentry *child)
699{
700 struct inode *child_inode = child->d_inode;
701 struct fuse_conn *fc = get_fuse_conn(child_inode);
702 struct inode *inode;
703 struct dentry *parent;
704 struct fuse_entry_out outarg;
705 struct qstr name;
706 int err;
707
708 if (!fc->export_support)
709 return ERR_PTR(-ESTALE);
710
711 name.len = 2;
712 name.name = "..";
713 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
714 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200715 if (err) {
716 if (err == -ENOENT)
717 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700718 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700719 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200720
721 parent = d_obtain_alias(inode);
Al Viroc35eebe2010-12-18 11:15:22 -0500722 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700723 fuse_invalidate_entry_cache(parent);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700724
725 return parent;
726}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700727
728static const struct export_operations fuse_export_operations = {
729 .fh_to_dentry = fuse_fh_to_dentry,
730 .fh_to_parent = fuse_fh_to_parent,
731 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700732 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700733};
734
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800735static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700736 .alloc_inode = fuse_alloc_inode,
737 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400738 .evict_inode = fuse_evict_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700739 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700740 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700741 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800742 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700743 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700744 .show_options = fuse_show_options,
745};
746
Csaba Henk487ea5a2009-08-26 19:17:22 +0200747static void sanitize_global_limit(unsigned *limit)
748{
749 if (*limit == 0)
750 *limit = ((num_physpages << PAGE_SHIFT) >> 13) /
751 sizeof(struct fuse_req);
752
753 if (*limit >= 1 << 16)
754 *limit = (1 << 16) - 1;
755}
756
757static int set_global_limit(const char *val, struct kernel_param *kp)
758{
759 int rv;
760
761 rv = param_set_uint(val, kp);
762 if (rv)
763 return rv;
764
765 sanitize_global_limit((unsigned *)kp->arg);
766
767 return 0;
768}
769
770static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
771{
772 int cap_sys_admin = capable(CAP_SYS_ADMIN);
773
774 if (arg->minor < 13)
775 return;
776
777 sanitize_global_limit(&max_user_bgreq);
778 sanitize_global_limit(&max_user_congthresh);
779
780 if (arg->max_background) {
781 fc->max_background = arg->max_background;
782
783 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
784 fc->max_background = max_user_bgreq;
785 }
786 if (arg->congestion_threshold) {
787 fc->congestion_threshold = arg->congestion_threshold;
788
789 if (!cap_sys_admin &&
790 fc->congestion_threshold > max_user_congthresh)
791 fc->congestion_threshold = max_user_congthresh;
792 }
793}
794
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800795static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
796{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800797 struct fuse_init_out *arg = &req->misc.init_out;
798
799 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
800 fc->conn_error = 1;
801 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800802 unsigned long ra_pages;
803
Csaba Henk487ea5a2009-08-26 19:17:22 +0200804 process_init_limits(fc, arg);
805
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800806 if (arg->minor >= 6) {
807 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
808 if (arg->flags & FUSE_ASYNC_READ)
809 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700810 if (!(arg->flags & FUSE_POSIX_LOCKS))
811 fc->no_lock = 1;
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700812 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
813 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700814 if (arg->minor >= 9) {
815 /* LOOKUP has dependency on proto version */
816 if (arg->flags & FUSE_EXPORT_SUPPORT)
817 fc->export_support = 1;
818 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700819 if (arg->flags & FUSE_BIG_WRITES)
820 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200821 if (arg->flags & FUSE_DONT_MASK)
822 fc->dont_mask = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700823 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800824 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700825 fc->no_lock = 1;
826 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800827
828 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800829 fc->minor = arg->minor;
830 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200831 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800832 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800833 }
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700834 fc->blocked = 0;
835 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800836}
837
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700838static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800839{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800840 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800841
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800842 arg->major = FUSE_KERNEL_VERSION;
843 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800844 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700845 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200846 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800847 req->in.h.opcode = FUSE_INIT;
848 req->in.numargs = 1;
849 req->in.args[0].size = sizeof(*arg);
850 req->in.args[0].value = arg;
851 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800852 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800853 with interface version < 7.5. Rest of init_out is zeroed
854 by do_get_request(), so a short reply is not a problem */
855 req->out.argvar = 1;
856 req->out.args[0].size = sizeof(struct fuse_init_out);
857 req->out.args[0].value = &req->misc.init_out;
858 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100859 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800860}
861
Tejun Heo43901aa2008-11-26 12:03:56 +0100862static void fuse_free_conn(struct fuse_conn *fc)
863{
864 kfree(fc);
865}
866
Tejun Heoa325f9b2009-04-14 10:54:52 +0900867static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
868{
869 int err;
870
Jens Axboed9938312009-06-12 14:45:52 +0200871 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900872 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
873 fc->bdi.unplug_io_fn = default_unplug_io_fn;
874 /* fuse does it's own writeback accounting */
875 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
876
877 err = bdi_init(&fc->bdi);
878 if (err)
879 return err;
880
881 fc->bdi_initialized = 1;
882
883 if (sb->s_bdev) {
884 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
885 MAJOR(fc->dev), MINOR(fc->dev));
886 } else {
887 err = bdi_register_dev(&fc->bdi, fc->dev);
888 }
889
890 if (err)
891 return err;
892
893 /*
894 * For a single fuse filesystem use max 1% of dirty +
895 * writeback threshold.
896 *
897 * This gives about 1M of write buffer for memory maps on a
898 * machine with 1G and 10% dirty_ratio, which should be more
899 * than enough.
900 *
901 * Privileged users can raise it by writing to
902 *
903 * /sys/class/bdi/<bdi>/max_ratio
904 */
905 bdi_set_max_ratio(&fc->bdi, 1);
906
907 return 0;
908}
909
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700910static int fuse_fill_super(struct super_block *sb, void *data, int silent)
911{
912 struct fuse_conn *fc;
913 struct inode *root;
914 struct fuse_mount_data d;
915 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800916 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700917 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700918 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -0800919 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700920
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100921 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -0700922 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100923 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -0700924
Miklos Szeredid8091612006-12-06 20:35:48 -0800925 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100926 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700927
Miklos Szeredid8091612006-12-06 20:35:48 -0800928 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800929#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100930 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -0800931 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100932 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800933#endif
Miklos Szeredid8091612006-12-06 20:35:48 -0800934 } else {
935 sb->s_blocksize = PAGE_CACHE_SIZE;
936 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
937 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700938 sb->s_magic = FUSE_SUPER_MAGIC;
939 sb->s_op = &fuse_super_operations;
940 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700941 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700942
943 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100944 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700945 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100946 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700947
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100948 if (file->f_op != &fuse_dev_operations)
949 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -0700950
Tejun Heo0d179aa2008-11-26 12:03:55 +0100951 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100952 err = -ENOMEM;
953 if (!fc)
954 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700955
Tejun Heoa325f9b2009-04-14 10:54:52 +0900956 fuse_conn_init(fc);
957
958 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -0400959 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900960 err = fuse_bdi_init(fc, sb);
961 if (err)
962 goto err_put_conn;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100963
Jens Axboe32a88aa2009-09-16 15:02:33 +0200964 sb->s_bdi = &fc->bdi;
965
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200966 /* Handle umasking inside the fuse code */
967 if (sb->s_flags & MS_POSIXACL)
968 fc->dont_mask = 1;
969 sb->s_flags |= MS_POSIXACL;
970
Tejun Heo43901aa2008-11-26 12:03:56 +0100971 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700972 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700973 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700974 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +0200975 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700976
Miklos Szeredif543f252006-01-16 22:14:35 -0800977 /* Used by get_root_inode() */
978 sb->s_fs_info = fc;
979
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700980 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +0100981 root = fuse_get_root_inode(sb, d.rootmode);
Miklos Szeredif543f252006-01-16 22:14:35 -0800982 if (!root)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100983 goto err_put_conn;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700984
Miklos Szeredif543f252006-01-16 22:14:35 -0800985 root_dentry = d_alloc_root(root);
986 if (!root_dentry) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700987 iput(root);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100988 goto err_put_conn;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700989 }
Al Viroc35eebe2010-12-18 11:15:22 -0500990 /* only now - we want root dentry with NULL ->d_op */
991 sb->s_d_op = &fuse_dentry_operations;
Miklos Szeredif543f252006-01-16 22:14:35 -0800992
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700993 init_req = fuse_request_alloc();
994 if (!init_req)
995 goto err_put_root;
996
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800997 if (is_bdev) {
998 fc->destroy_req = fuse_request_alloc();
999 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001000 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001001 }
1002
Miklos Szeredibafa9652006-06-25 05:48:51 -07001003 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001004 err = -EINVAL;
1005 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001006 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001007
Miklos Szeredibafa9652006-06-25 05:48:51 -07001008 err = fuse_ctl_add_conn(fc);
1009 if (err)
1010 goto err_unlock;
1011
1012 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001013 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -08001014 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001015 file->private_data = fuse_conn_get(fc);
1016 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001017 /*
1018 * atomic_dec_and_test() in fput() provides the necessary
1019 * memory barrier for file->private_data to be visible on all
1020 * CPUs after this
1021 */
1022 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001023
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001024 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001025
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001026 return 0;
1027
Miklos Szeredibafa9652006-06-25 05:48:51 -07001028 err_unlock:
1029 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001030 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001031 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001032 err_put_root:
1033 dput(root_dentry);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001034 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001035 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001036 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001037 err_fput:
1038 fput(file);
1039 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001040 return err;
1041}
1042
Al Viro3c26ff62010-07-25 11:46:36 +04001043static struct dentry *fuse_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001044 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +04001045 void *raw_data)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001046{
Al Viro3c26ff62010-07-25 11:46:36 +04001047 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001048}
1049
John Muir3b463ae2009-05-31 11:13:57 -04001050static void fuse_kill_sb_anon(struct super_block *sb)
1051{
1052 struct fuse_conn *fc = get_fuse_conn_super(sb);
1053
1054 if (fc) {
1055 down_write(&fc->killsb);
1056 fc->sb = NULL;
1057 up_write(&fc->killsb);
1058 }
1059
1060 kill_anon_super(sb);
1061}
1062
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001063static struct file_system_type fuse_fs_type = {
1064 .owner = THIS_MODULE,
1065 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001066 .fs_flags = FS_HAS_SUBTYPE,
Al Viro3c26ff62010-07-25 11:46:36 +04001067 .mount = fuse_mount,
John Muir3b463ae2009-05-31 11:13:57 -04001068 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001069};
1070
1071#ifdef CONFIG_BLOCK
Al Viro152a0832010-07-25 00:46:55 +04001072static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001073 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001074 void *raw_data)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001075{
Al Viro152a0832010-07-25 00:46:55 +04001076 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001077}
1078
John Muir3b463ae2009-05-31 11:13:57 -04001079static void fuse_kill_sb_blk(struct super_block *sb)
1080{
1081 struct fuse_conn *fc = get_fuse_conn_super(sb);
1082
1083 if (fc) {
1084 down_write(&fc->killsb);
1085 fc->sb = NULL;
1086 up_write(&fc->killsb);
1087 }
1088
1089 kill_block_super(sb);
1090}
1091
Miklos Szeredid6392f82006-12-06 20:35:44 -08001092static struct file_system_type fuseblk_fs_type = {
1093 .owner = THIS_MODULE,
1094 .name = "fuseblk",
Al Viro152a0832010-07-25 00:46:55 +04001095 .mount = fuse_mount_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001096 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001097 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001098};
1099
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001100static inline int register_fuseblk(void)
1101{
1102 return register_filesystem(&fuseblk_fs_type);
1103}
1104
1105static inline void unregister_fuseblk(void)
1106{
1107 unregister_filesystem(&fuseblk_fs_type);
1108}
1109#else
1110static inline int register_fuseblk(void)
1111{
1112 return 0;
1113}
1114
1115static inline void unregister_fuseblk(void)
1116{
1117}
1118#endif
1119
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001120static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001121{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001122 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001123
Christoph Lametera35afb82007-05-16 22:10:57 -07001124 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001125}
1126
1127static int __init fuse_fs_init(void)
1128{
1129 int err;
1130
1131 err = register_filesystem(&fuse_fs_type);
1132 if (err)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001133 goto out;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001134
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001135 err = register_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -08001136 if (err)
1137 goto out_unreg;
1138
1139 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1140 sizeof(struct fuse_inode),
1141 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001142 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001143 err = -ENOMEM;
1144 if (!fuse_inode_cachep)
1145 goto out_unreg2;
1146
1147 return 0;
1148
1149 out_unreg2:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001150 unregister_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -08001151 out_unreg:
1152 unregister_filesystem(&fuse_fs_type);
1153 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001154 return err;
1155}
1156
1157static void fuse_fs_cleanup(void)
1158{
1159 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001160 unregister_fuseblk();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001161 kmem_cache_destroy(fuse_inode_cachep);
1162}
1163
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001164static struct kobject *fuse_kobj;
1165static struct kobject *connections_kobj;
1166
Miklos Szeredif543f252006-01-16 22:14:35 -08001167static int fuse_sysfs_init(void)
1168{
1169 int err;
1170
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001171 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001172 if (!fuse_kobj) {
1173 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001174 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001175 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001176
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001177 connections_kobj = kobject_create_and_add("connections", fuse_kobj);
1178 if (!connections_kobj) {
1179 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001180 goto out_fuse_unregister;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001181 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001182
1183 return 0;
1184
1185 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001186 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001187 out_err:
1188 return err;
1189}
1190
1191static void fuse_sysfs_cleanup(void)
1192{
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001193 kobject_put(connections_kobj);
1194 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001195}
1196
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001197static int __init fuse_init(void)
1198{
1199 int res;
1200
Miklos Szeredi1729a162008-11-26 12:03:54 +01001201 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001202 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1203
Miklos Szeredibafa9652006-06-25 05:48:51 -07001204 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001205 res = fuse_fs_init();
1206 if (res)
1207 goto err;
1208
Miklos Szeredi334f4852005-09-09 13:10:27 -07001209 res = fuse_dev_init();
1210 if (res)
1211 goto err_fs_cleanup;
1212
Miklos Szeredif543f252006-01-16 22:14:35 -08001213 res = fuse_sysfs_init();
1214 if (res)
1215 goto err_dev_cleanup;
1216
Miklos Szeredibafa9652006-06-25 05:48:51 -07001217 res = fuse_ctl_init();
1218 if (res)
1219 goto err_sysfs_cleanup;
1220
Csaba Henk487ea5a2009-08-26 19:17:22 +02001221 sanitize_global_limit(&max_user_bgreq);
1222 sanitize_global_limit(&max_user_congthresh);
1223
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001224 return 0;
1225
Miklos Szeredibafa9652006-06-25 05:48:51 -07001226 err_sysfs_cleanup:
1227 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001228 err_dev_cleanup:
1229 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001230 err_fs_cleanup:
1231 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001232 err:
1233 return res;
1234}
1235
1236static void __exit fuse_exit(void)
1237{
1238 printk(KERN_DEBUG "fuse exit\n");
1239
Miklos Szeredibafa9652006-06-25 05:48:51 -07001240 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001241 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001242 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001243 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001244}
1245
1246module_init(fuse_init);
1247module_exit(fuse_exit);