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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
74static struct inode *fuse_alloc_inode(struct super_block *sb)
75{
76 struct inode *inode;
77 struct fuse_inode *fi;
78
Christoph Lametere94b1762006-12-06 20:33:17 -080079 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070080 if (!inode)
81 return NULL;
82
83 fi = get_fuse_inode(inode);
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070084 fi->i_time = 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070085 fi->nodeid = 0;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070086 fi->nlookup = 0;
John Muirfbee36b2007-11-28 16:22:02 -080087 fi->attr_version = 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -070088 fi->writectr = 0;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070089 INIT_LIST_HEAD(&fi->write_files);
Miklos Szeredi3be5a522008-04-30 00:54:41 -070090 INIT_LIST_HEAD(&fi->queued_writes);
91 INIT_LIST_HEAD(&fi->writepages);
92 init_waitqueue_head(&fi->page_waitq);
Miklos Szeredie5e55582005-09-09 13:10:28 -070093 fi->forget_req = fuse_request_alloc();
94 if (!fi->forget_req) {
95 kmem_cache_free(fuse_inode_cachep, inode);
96 return NULL;
97 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070098
99 return inode;
100}
101
102static void fuse_destroy_inode(struct inode *inode)
103{
Miklos Szeredie5e55582005-09-09 13:10:28 -0700104 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700105 BUG_ON(!list_empty(&fi->write_files));
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700106 BUG_ON(!list_empty(&fi->queued_writes));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700107 if (fi->forget_req)
108 fuse_request_free(fi->forget_req);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700109 kmem_cache_free(fuse_inode_cachep, inode);
110}
111
Miklos Szeredie5e55582005-09-09 13:10:28 -0700112void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
Miklos Szeredib48badf2008-04-30 00:54:44 -0700113 u64 nodeid, u64 nlookup)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700114{
115 struct fuse_forget_in *inarg = &req->misc.forget_in;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700116 inarg->nlookup = nlookup;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700117 req->in.h.opcode = FUSE_FORGET;
118 req->in.h.nodeid = nodeid;
119 req->in.numargs = 1;
120 req->in.args[0].size = sizeof(struct fuse_forget_in);
121 req->in.args[0].value = inarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100122 fuse_request_send_noreply(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700123}
124
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700125static void fuse_clear_inode(struct inode *inode)
126{
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 Szeredi9e6268d2005-09-09 13:10:29 -0700130 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700131 fi->forget_req = NULL;
132 }
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 Savolaa5bfffa2007-04-08 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);
535 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700536 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
537 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100538 fc->khctr = 0;
539 fc->polled_files = RB_ROOT;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100540 fc->reqctr = 0;
541 fc->blocked = 1;
542 fc->attr_version = 1;
543 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700544}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100545EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700546
Miklos Szeredibafa9652006-06-25 05:48:51 -0700547void fuse_conn_put(struct fuse_conn *fc)
548{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700549 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800550 if (fc->destroy_req)
551 fuse_request_free(fc->destroy_req);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700552 mutex_destroy(&fc->inst_mutex);
Tejun Heo43901aa2008-11-26 12:03:56 +0100553 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700554 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700555}
Tejun Heo08cbf542009-04-14 10:54:53 +0900556EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700557
558struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
559{
560 atomic_inc(&fc->count);
561 return fc;
562}
Tejun Heo08cbf542009-04-14 10:54:53 +0900563EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700564
Tejun Heob93f8582008-11-26 12:03:55 +0100565static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700566{
567 struct fuse_attr attr;
568 memset(&attr, 0, sizeof(attr));
569
570 attr.mode = mode;
571 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700572 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700573 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700574}
575
Miklos Szeredi1729a162008-11-26 12:03:54 +0100576struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700577 u64 nodeid;
578 u32 generation;
579};
580
581static struct dentry *fuse_get_dentry(struct super_block *sb,
582 struct fuse_inode_handle *handle)
583{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700584 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700585 struct inode *inode;
586 struct dentry *entry;
587 int err = -ESTALE;
588
589 if (handle->nodeid == 0)
590 goto out_err;
591
592 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700593 if (!inode) {
594 struct fuse_entry_out outarg;
595 struct qstr name;
596
597 if (!fc->export_support)
598 goto out_err;
599
600 name.len = 1;
601 name.name = ".";
602 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
603 &inode);
604 if (err && err != -ENOENT)
605 goto out_err;
606 if (err || !inode) {
607 err = -ESTALE;
608 goto out_err;
609 }
610 err = -EIO;
611 if (get_node_id(inode) != handle->nodeid)
612 goto out_iput;
613 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700614 err = -ESTALE;
615 if (inode->i_generation != handle->generation)
616 goto out_iput;
617
Christoph Hellwig44003722008-08-11 15:49:04 +0200618 entry = d_obtain_alias(inode);
619 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700620 entry->d_op = &fuse_dentry_operations;
621 fuse_invalidate_entry_cache(entry);
622 }
623
624 return entry;
625
626 out_iput:
627 iput(inode);
628 out_err:
629 return ERR_PTR(err);
630}
631
632static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
633 int connectable)
634{
635 struct inode *inode = dentry->d_inode;
636 bool encode_parent = connectable && !S_ISDIR(inode->i_mode);
637 int len = encode_parent ? 6 : 3;
638 u64 nodeid;
639 u32 generation;
640
641 if (*max_len < len)
642 return 255;
643
644 nodeid = get_fuse_inode(inode)->nodeid;
645 generation = inode->i_generation;
646
647 fh[0] = (u32)(nodeid >> 32);
648 fh[1] = (u32)(nodeid & 0xffffffff);
649 fh[2] = generation;
650
651 if (encode_parent) {
652 struct inode *parent;
653
654 spin_lock(&dentry->d_lock);
655 parent = dentry->d_parent->d_inode;
656 nodeid = get_fuse_inode(parent)->nodeid;
657 generation = parent->i_generation;
658 spin_unlock(&dentry->d_lock);
659
660 fh[3] = (u32)(nodeid >> 32);
661 fh[4] = (u32)(nodeid & 0xffffffff);
662 fh[5] = generation;
663 }
664
665 *max_len = len;
666 return encode_parent ? 0x82 : 0x81;
667}
668
669static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
670 struct fid *fid, int fh_len, int fh_type)
671{
672 struct fuse_inode_handle handle;
673
674 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
675 return NULL;
676
677 handle.nodeid = (u64) fid->raw[0] << 32;
678 handle.nodeid |= (u64) fid->raw[1];
679 handle.generation = fid->raw[2];
680 return fuse_get_dentry(sb, &handle);
681}
682
683static struct dentry *fuse_fh_to_parent(struct super_block *sb,
684 struct fid *fid, int fh_len, int fh_type)
685{
686 struct fuse_inode_handle parent;
687
688 if (fh_type != 0x82 || fh_len < 6)
689 return NULL;
690
691 parent.nodeid = (u64) fid->raw[3] << 32;
692 parent.nodeid |= (u64) fid->raw[4];
693 parent.generation = fid->raw[5];
694 return fuse_get_dentry(sb, &parent);
695}
696
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700697static struct dentry *fuse_get_parent(struct dentry *child)
698{
699 struct inode *child_inode = child->d_inode;
700 struct fuse_conn *fc = get_fuse_conn(child_inode);
701 struct inode *inode;
702 struct dentry *parent;
703 struct fuse_entry_out outarg;
704 struct qstr name;
705 int err;
706
707 if (!fc->export_support)
708 return ERR_PTR(-ESTALE);
709
710 name.len = 2;
711 name.name = "..";
712 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
713 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200714 if (err) {
715 if (err == -ENOENT)
716 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700717 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700718 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200719
720 parent = d_obtain_alias(inode);
721 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) {
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700722 parent->d_op = &fuse_dentry_operations;
723 fuse_invalidate_entry_cache(parent);
724 }
725
726 return parent;
727}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700728
729static const struct export_operations fuse_export_operations = {
730 .fh_to_dentry = fuse_fh_to_dentry,
731 .fh_to_parent = fuse_fh_to_parent,
732 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700733 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700734};
735
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800736static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700737 .alloc_inode = fuse_alloc_inode,
738 .destroy_inode = fuse_destroy_inode,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700739 .clear_inode = fuse_clear_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700740 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700741 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700742 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800743 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700744 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700745 .show_options = fuse_show_options,
746};
747
Csaba Henk487ea5a2009-08-26 19:17:22 +0200748static void sanitize_global_limit(unsigned *limit)
749{
750 if (*limit == 0)
751 *limit = ((num_physpages << PAGE_SHIFT) >> 13) /
752 sizeof(struct fuse_req);
753
754 if (*limit >= 1 << 16)
755 *limit = (1 << 16) - 1;
756}
757
758static int set_global_limit(const char *val, struct kernel_param *kp)
759{
760 int rv;
761
762 rv = param_set_uint(val, kp);
763 if (rv)
764 return rv;
765
766 sanitize_global_limit((unsigned *)kp->arg);
767
768 return 0;
769}
770
771static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
772{
773 int cap_sys_admin = capable(CAP_SYS_ADMIN);
774
775 if (arg->minor < 13)
776 return;
777
778 sanitize_global_limit(&max_user_bgreq);
779 sanitize_global_limit(&max_user_congthresh);
780
781 if (arg->max_background) {
782 fc->max_background = arg->max_background;
783
784 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
785 fc->max_background = max_user_bgreq;
786 }
787 if (arg->congestion_threshold) {
788 fc->congestion_threshold = arg->congestion_threshold;
789
790 if (!cap_sys_admin &&
791 fc->congestion_threshold > max_user_congthresh)
792 fc->congestion_threshold = max_user_congthresh;
793 }
794}
795
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800796static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
797{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800798 struct fuse_init_out *arg = &req->misc.init_out;
799
800 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
801 fc->conn_error = 1;
802 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800803 unsigned long ra_pages;
804
Csaba Henk487ea5a2009-08-26 19:17:22 +0200805 process_init_limits(fc, arg);
806
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800807 if (arg->minor >= 6) {
808 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
809 if (arg->flags & FUSE_ASYNC_READ)
810 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700811 if (!(arg->flags & FUSE_POSIX_LOCKS))
812 fc->no_lock = 1;
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700813 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
814 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700815 if (arg->minor >= 9) {
816 /* LOOKUP has dependency on proto version */
817 if (arg->flags & FUSE_EXPORT_SUPPORT)
818 fc->export_support = 1;
819 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700820 if (arg->flags & FUSE_BIG_WRITES)
821 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200822 if (arg->flags & FUSE_DONT_MASK)
823 fc->dont_mask = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700824 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800825 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700826 fc->no_lock = 1;
827 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800828
829 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800830 fc->minor = arg->minor;
831 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200832 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800833 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800834 }
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700835 fc->blocked = 0;
836 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800837}
838
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700839static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800840{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800841 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800842
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800843 arg->major = FUSE_KERNEL_VERSION;
844 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800845 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700846 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200847 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800848 req->in.h.opcode = FUSE_INIT;
849 req->in.numargs = 1;
850 req->in.args[0].size = sizeof(*arg);
851 req->in.args[0].value = arg;
852 req->out.numargs = 1;
853 /* Variable length arguement used for backward compatibility
854 with interface version < 7.5. Rest of init_out is zeroed
855 by do_get_request(), so a short reply is not a problem */
856 req->out.argvar = 1;
857 req->out.args[0].size = sizeof(struct fuse_init_out);
858 req->out.args[0].value = &req->misc.init_out;
859 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100860 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800861}
862
Tejun Heo43901aa2008-11-26 12:03:56 +0100863static void fuse_free_conn(struct fuse_conn *fc)
864{
865 kfree(fc);
866}
867
Tejun Heoa325f9b2009-04-14 10:54:52 +0900868static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
869{
870 int err;
871
Jens Axboed9938312009-06-12 14:45:52 +0200872 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900873 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
874 fc->bdi.unplug_io_fn = default_unplug_io_fn;
875 /* fuse does it's own writeback accounting */
876 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
877
878 err = bdi_init(&fc->bdi);
879 if (err)
880 return err;
881
882 fc->bdi_initialized = 1;
883
884 if (sb->s_bdev) {
885 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
886 MAJOR(fc->dev), MINOR(fc->dev));
887 } else {
888 err = bdi_register_dev(&fc->bdi, fc->dev);
889 }
890
891 if (err)
892 return err;
893
894 /*
895 * For a single fuse filesystem use max 1% of dirty +
896 * writeback threshold.
897 *
898 * This gives about 1M of write buffer for memory maps on a
899 * machine with 1G and 10% dirty_ratio, which should be more
900 * than enough.
901 *
902 * Privileged users can raise it by writing to
903 *
904 * /sys/class/bdi/<bdi>/max_ratio
905 */
906 bdi_set_max_ratio(&fc->bdi, 1);
907
908 return 0;
909}
910
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700911static int fuse_fill_super(struct super_block *sb, void *data, int silent)
912{
913 struct fuse_conn *fc;
914 struct inode *root;
915 struct fuse_mount_data d;
916 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800917 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700918 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700919 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -0800920 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700921
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100922 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -0700923 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100924 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -0700925
Miklos Szeredid8091612006-12-06 20:35:48 -0800926 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100927 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700928
Miklos Szeredid8091612006-12-06 20:35:48 -0800929 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800930#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100931 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -0800932 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100933 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800934#endif
Miklos Szeredid8091612006-12-06 20:35:48 -0800935 } else {
936 sb->s_blocksize = PAGE_CACHE_SIZE;
937 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
938 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700939 sb->s_magic = FUSE_SUPER_MAGIC;
940 sb->s_op = &fuse_super_operations;
941 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700942 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700943
944 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100945 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700946 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100947 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700948
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100949 if (file->f_op != &fuse_dev_operations)
950 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -0700951
Tejun Heo0d179aa2008-11-26 12:03:55 +0100952 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100953 err = -ENOMEM;
954 if (!fc)
955 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700956
Tejun Heoa325f9b2009-04-14 10:54:52 +0900957 fuse_conn_init(fc);
958
959 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -0400960 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900961 err = fuse_bdi_init(fc, sb);
962 if (err)
963 goto err_put_conn;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100964
Jens Axboe32a88aa2009-09-16 15:02:33 +0200965 sb->s_bdi = &fc->bdi;
966
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200967 /* Handle umasking inside the fuse code */
968 if (sb->s_flags & MS_POSIXACL)
969 fc->dont_mask = 1;
970 sb->s_flags |= MS_POSIXACL;
971
Tejun Heo43901aa2008-11-26 12:03:56 +0100972 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700973 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700974 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700975 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +0200976 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700977
Miklos Szeredif543f252006-01-16 22:14:35 -0800978 /* Used by get_root_inode() */
979 sb->s_fs_info = fc;
980
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700981 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +0100982 root = fuse_get_root_inode(sb, d.rootmode);
Miklos Szeredif543f252006-01-16 22:14:35 -0800983 if (!root)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100984 goto err_put_conn;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700985
Miklos Szeredif543f252006-01-16 22:14:35 -0800986 root_dentry = d_alloc_root(root);
987 if (!root_dentry) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700988 iput(root);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100989 goto err_put_conn;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700990 }
Miklos Szeredif543f252006-01-16 22:14:35 -0800991
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700992 init_req = fuse_request_alloc();
993 if (!init_req)
994 goto err_put_root;
995
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800996 if (is_bdev) {
997 fc->destroy_req = fuse_request_alloc();
998 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +0200999 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001000 }
1001
Miklos Szeredibafa9652006-06-25 05:48:51 -07001002 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001003 err = -EINVAL;
1004 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001005 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001006
Miklos Szeredibafa9652006-06-25 05:48:51 -07001007 err = fuse_ctl_add_conn(fc);
1008 if (err)
1009 goto err_unlock;
1010
1011 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001012 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -08001013 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001014 file->private_data = fuse_conn_get(fc);
1015 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001016 /*
1017 * atomic_dec_and_test() in fput() provides the necessary
1018 * memory barrier for file->private_data to be visible on all
1019 * CPUs after this
1020 */
1021 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001022
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001023 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001024
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001025 return 0;
1026
Miklos Szeredibafa9652006-06-25 05:48:51 -07001027 err_unlock:
1028 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001029 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001030 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001031 err_put_root:
1032 dput(root_dentry);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001033 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001034 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001035 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001036 err_fput:
1037 fput(file);
1038 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001039 return err;
1040}
1041
David Howells454e2392006-06-23 02:02:57 -07001042static int fuse_get_sb(struct file_system_type *fs_type,
1043 int flags, const char *dev_name,
1044 void *raw_data, struct vfsmount *mnt)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001045{
David Howells454e2392006-06-23 02:02:57 -07001046 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001047}
1048
John Muir3b463ae2009-05-31 11:13:57 -04001049static void fuse_kill_sb_anon(struct super_block *sb)
1050{
1051 struct fuse_conn *fc = get_fuse_conn_super(sb);
1052
1053 if (fc) {
1054 down_write(&fc->killsb);
1055 fc->sb = NULL;
1056 up_write(&fc->killsb);
1057 }
1058
1059 kill_anon_super(sb);
1060}
1061
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001062static struct file_system_type fuse_fs_type = {
1063 .owner = THIS_MODULE,
1064 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001065 .fs_flags = FS_HAS_SUBTYPE,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001066 .get_sb = fuse_get_sb,
John Muir3b463ae2009-05-31 11:13:57 -04001067 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001068};
1069
1070#ifdef CONFIG_BLOCK
Miklos Szeredid6392f82006-12-06 20:35:44 -08001071static int fuse_get_sb_blk(struct file_system_type *fs_type,
1072 int flags, const char *dev_name,
1073 void *raw_data, struct vfsmount *mnt)
1074{
1075 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
1076 mnt);
1077}
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",
1095 .get_sb = fuse_get_sb_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);