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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
Al Virob57922d2010-06-07 14:34:48 -0400125static void fuse_evict_inode(struct inode *inode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700126{
Al Virob57922d2010-06-07 14:34:48 -0400127 truncate_inode_pages(&inode->i_data, 0);
128 end_writeback(inode);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700129 if (inode->i_sb->s_flags & MS_ACTIVE) {
130 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700131 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700132 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700133 fi->forget_req = NULL;
134 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700135}
136
Miklos Szeredi71421252006-06-25 05:48:52 -0700137static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
138{
139 if (*flags & MS_MANDLOCK)
140 return -EINVAL;
141
142 return 0;
143}
144
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700145void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
146 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700147{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700148 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700149 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700150
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700151 fi->attr_version = ++fc->attr_version;
152 fi->i_time = attr_valid;
153
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700154 inode->i_ino = attr->ino;
Miklos Szerediebc14c42007-10-16 23:31:03 -0700155 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700156 inode->i_nlink = attr->nlink;
157 inode->i_uid = attr->uid;
158 inode->i_gid = attr->gid;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700159 inode->i_blocks = attr->blocks;
160 inode->i_atime.tv_sec = attr->atime;
161 inode->i_atime.tv_nsec = attr->atimensec;
162 inode->i_mtime.tv_sec = attr->mtime;
163 inode->i_mtime.tv_nsec = attr->mtimensec;
164 inode->i_ctime.tv_sec = attr->ctime;
165 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700166
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700167 if (attr->blksize != 0)
168 inode->i_blkbits = ilog2(attr->blksize);
169 else
170 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
171
Miklos Szerediebc14c42007-10-16 23:31:03 -0700172 /*
173 * Don't set the sticky bit in i_mode, unless we want the VFS
174 * to check permissions. This prevents failures due to the
175 * check in may_delete().
176 */
177 fi->orig_i_mode = inode->i_mode;
178 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
179 inode->i_mode &= ~S_ISVTX;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700180}
181
182void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
183 u64 attr_valid, u64 attr_version)
184{
185 struct fuse_conn *fc = get_fuse_conn(inode);
186 struct fuse_inode *fi = get_fuse_inode(inode);
187 loff_t oldsize;
188
189 spin_lock(&fc->lock);
190 if (attr_version != 0 && fi->attr_version > attr_version) {
191 spin_unlock(&fc->lock);
192 return;
193 }
194
195 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700196
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700197 oldsize = inode->i_size;
198 i_size_write(inode, attr->size);
199 spin_unlock(&fc->lock);
200
201 if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
npiggin@suse.dec08d3b02009-08-21 02:35:06 +1000202 truncate_pagecache(inode, oldsize, attr->size);
Miklos Szeredib1009972007-10-16 23:31:01 -0700203 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700204 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700205}
206
207static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
208{
209 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700210 inode->i_size = attr->size;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700211 if (S_ISREG(inode->i_mode)) {
212 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700213 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700214 } else if (S_ISDIR(inode->i_mode))
215 fuse_init_dir(inode);
216 else if (S_ISLNK(inode->i_mode))
217 fuse_init_symlink(inode);
218 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
219 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
220 fuse_init_common(inode);
221 init_special_inode(inode, inode->i_mode,
222 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800223 } else
224 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700225}
226
John Muir3b463ae2009-05-31 11:13:57 -0400227int fuse_inode_eq(struct inode *inode, void *_nodeidp)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700228{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700229 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700230 if (get_node_id(inode) == nodeid)
231 return 1;
232 else
233 return 0;
234}
235
236static int fuse_inode_set(struct inode *inode, void *_nodeidp)
237{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700238 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700239 get_fuse_inode(inode)->nodeid = nodeid;
240 return 0;
241}
242
Miklos Szeredib48badf2008-04-30 00:54:44 -0700243struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700244 int generation, struct fuse_attr *attr,
245 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700246{
247 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700248 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700249 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700250
251 retry:
252 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
253 if (!inode)
254 return NULL;
255
256 if ((inode->i_state & I_NEW)) {
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700257 inode->i_flags |= S_NOATIME|S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700258 inode->i_generation = generation;
259 inode->i_data.backing_dev_info = &fc->bdi;
260 fuse_init_inode(inode, attr);
261 unlock_new_inode(inode);
262 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700263 /* Inode has changed type, any I/O on the old should fail */
264 make_bad_inode(inode);
265 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700266 goto retry;
267 }
268
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700269 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700270 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100271 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700272 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700273 fuse_change_attributes(inode, attr, attr_valid, attr_version);
274
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700275 return inode;
276}
277
John Muir3b463ae2009-05-31 11:13:57 -0400278int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
279 loff_t offset, loff_t len)
280{
281 struct inode *inode;
282 pgoff_t pg_start;
283 pgoff_t pg_end;
284
285 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
286 if (!inode)
287 return -ENOENT;
288
289 fuse_invalidate_attr(inode);
290 if (offset >= 0) {
291 pg_start = offset >> PAGE_CACHE_SHIFT;
292 if (len <= 0)
293 pg_end = -1;
294 else
295 pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
296 invalidate_inode_pages2_range(inode->i_mapping,
297 pg_start, pg_end);
298 }
299 iput(inode);
300 return 0;
301}
302
Al Viro42faad92008-04-24 07:21:56 -0400303static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800304{
Al Viro42faad92008-04-24 07:21:56 -0400305 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800306}
307
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800308static void fuse_send_destroy(struct fuse_conn *fc)
309{
310 struct fuse_req *req = fc->destroy_req;
311 if (req && fc->conn_init) {
312 fc->destroy_req = NULL;
313 req->in.h.opcode = FUSE_DESTROY;
314 req->force = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100315 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800316 fuse_put_request(fc, req);
317 }
318}
319
Tejun Heoa325f9b2009-04-14 10:54:52 +0900320static void fuse_bdi_destroy(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700321{
Tejun Heoa325f9b2009-04-14 10:54:52 +0900322 if (fc->bdi_initialized)
323 bdi_destroy(&fc->bdi);
324}
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700325
Tejun Heo08cbf542009-04-14 10:54:53 +0900326void fuse_conn_kill(struct fuse_conn *fc)
Tejun Heoa325f9b2009-04-14 10:54:52 +0900327{
Miklos Szeredid7133112006-04-10 22:54:55 -0700328 spin_lock(&fc->lock);
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800329 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700330 fc->blocked = 0;
Miklos Szeredid7133112006-04-10 22:54:55 -0700331 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700332 /* Flush all readers on this fs */
Jeff Dike385a17b2006-04-10 22:54:52 -0700333 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700334 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700335 wake_up_all(&fc->blocked_waitq);
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700336 wake_up_all(&fc->reserved_req_waitq);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700337 mutex_lock(&fuse_mutex);
338 list_del(&fc->entry);
339 fuse_ctl_remove_conn(fc);
340 mutex_unlock(&fuse_mutex);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900341 fuse_bdi_destroy(fc);
342}
Tejun Heo08cbf542009-04-14 10:54:53 +0900343EXPORT_SYMBOL_GPL(fuse_conn_kill);
Tejun Heoa325f9b2009-04-14 10:54:52 +0900344
345static void fuse_put_super(struct super_block *sb)
346{
347 struct fuse_conn *fc = get_fuse_conn_super(sb);
348
349 fuse_send_destroy(fc);
350 fuse_conn_kill(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700351 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700352}
353
Miklos Szeredie5e55582005-09-09 13:10:28 -0700354static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
355{
356 stbuf->f_type = FUSE_SUPER_MAGIC;
357 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800358 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700359 stbuf->f_blocks = attr->blocks;
360 stbuf->f_bfree = attr->bfree;
361 stbuf->f_bavail = attr->bavail;
362 stbuf->f_files = attr->files;
363 stbuf->f_ffree = attr->ffree;
364 stbuf->f_namelen = attr->namelen;
365 /* fsid is left zero */
366}
367
David Howells726c3342006-06-23 02:02:58 -0700368static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700369{
David Howells726c3342006-06-23 02:02:58 -0700370 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700371 struct fuse_conn *fc = get_fuse_conn_super(sb);
372 struct fuse_req *req;
373 struct fuse_statfs_out outarg;
374 int err;
375
Miklos Szeredie57ac682007-10-18 03:06:58 -0700376 if (!fuse_allow_task(fc, current)) {
377 buf->f_type = FUSE_SUPER_MAGIC;
378 return 0;
379 }
380
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700381 req = fuse_get_req(fc);
382 if (IS_ERR(req))
383 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700384
Miklos Szeredide5f1202006-01-06 00:19:37 -0800385 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700386 req->in.numargs = 0;
387 req->in.h.opcode = FUSE_STATFS;
Miklos Szeredi5b35e8e2006-09-29 01:59:34 -0700388 req->in.h.nodeid = get_node_id(dentry->d_inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700389 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800390 req->out.args[0].size =
391 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700392 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100393 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700394 err = req->out.h.error;
395 if (!err)
396 convert_fuse_statfs(buf, &outarg.st);
397 fuse_put_request(fc, req);
398 return err;
399}
400
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700401enum {
402 OPT_FD,
403 OPT_ROOTMODE,
404 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700405 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700406 OPT_DEFAULT_PERMISSIONS,
407 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700408 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800409 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700410 OPT_ERR
411};
412
Steven Whitehousea447c092008-10-13 10:46:57 +0100413static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700414 {OPT_FD, "fd=%u"},
415 {OPT_ROOTMODE, "rootmode=%o"},
416 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700417 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700418 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
419 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700420 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800421 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700422 {OPT_ERR, NULL}
423};
424
Miklos Szeredid8091612006-12-06 20:35:48 -0800425static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700426{
427 char *p;
428 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700429 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800430 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700431
432 while ((p = strsep(&opt, ",")) != NULL) {
433 int token;
434 int value;
435 substring_t args[MAX_OPT_ARGS];
436 if (!*p)
437 continue;
438
439 token = match_token(p, tokens, args);
440 switch (token) {
441 case OPT_FD:
442 if (match_int(&args[0], &value))
443 return 0;
444 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700445 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700446 break;
447
448 case OPT_ROOTMODE:
449 if (match_octal(&args[0], &value))
450 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700451 if (!fuse_valid_type(value))
452 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700453 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700454 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700455 break;
456
457 case OPT_USER_ID:
458 if (match_int(&args[0], &value))
459 return 0;
460 d->user_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700461 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700462 break;
463
Miklos Szeredi87729a52005-09-09 13:10:34 -0700464 case OPT_GROUP_ID:
465 if (match_int(&args[0], &value))
466 return 0;
467 d->group_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700468 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700469 break;
470
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700471 case OPT_DEFAULT_PERMISSIONS:
472 d->flags |= FUSE_DEFAULT_PERMISSIONS;
473 break;
474
475 case OPT_ALLOW_OTHER:
476 d->flags |= FUSE_ALLOW_OTHER;
477 break;
478
Miklos Szeredidb50b962005-09-09 13:10:33 -0700479 case OPT_MAX_READ:
480 if (match_int(&args[0], &value))
481 return 0;
482 d->max_read = value;
483 break;
484
Miklos Szeredid8091612006-12-06 20:35:48 -0800485 case OPT_BLKSIZE:
486 if (!is_bdev || match_int(&args[0], &value))
487 return 0;
488 d->blksize = value;
489 break;
490
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700491 default:
492 return 0;
493 }
494 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700495
496 if (!d->fd_present || !d->rootmode_present ||
497 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700498 return 0;
499
500 return 1;
501}
502
503static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
504{
505 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
506
507 seq_printf(m, ",user_id=%u", fc->user_id);
Miklos Szeredi87729a52005-09-09 13:10:34 -0700508 seq_printf(m, ",group_id=%u", fc->group_id);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700509 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
510 seq_puts(m, ",default_permissions");
511 if (fc->flags & FUSE_ALLOW_OTHER)
512 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700513 if (fc->max_read != ~0)
514 seq_printf(m, ",max_read=%u", fc->max_read);
Miklos Szeredid1875db2008-02-08 04:21:43 -0800515 if (mnt->mnt_sb->s_bdev &&
516 mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
517 seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700518 return 0;
519}
520
Tejun Heoa325f9b2009-04-14 10:54:52 +0900521void fuse_conn_init(struct fuse_conn *fc)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700522{
Tejun Heo0d179aa2008-11-26 12:03:55 +0100523 memset(fc, 0, sizeof(*fc));
524 spin_lock_init(&fc->lock);
525 mutex_init(&fc->inst_mutex);
John Muir3b463ae2009-05-31 11:13:57 -0400526 init_rwsem(&fc->killsb);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100527 atomic_set(&fc->count, 1);
528 init_waitqueue_head(&fc->waitq);
529 init_waitqueue_head(&fc->blocked_waitq);
530 init_waitqueue_head(&fc->reserved_req_waitq);
531 INIT_LIST_HEAD(&fc->pending);
532 INIT_LIST_HEAD(&fc->processing);
533 INIT_LIST_HEAD(&fc->io);
534 INIT_LIST_HEAD(&fc->interrupts);
535 INIT_LIST_HEAD(&fc->bg_queue);
536 INIT_LIST_HEAD(&fc->entry);
537 atomic_set(&fc->num_waiting, 0);
Csaba Henk7a6d3c82009-07-01 17:28:41 -0700538 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
539 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100540 fc->khctr = 0;
541 fc->polled_files = RB_ROOT;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100542 fc->reqctr = 0;
543 fc->blocked = 1;
544 fc->attr_version = 1;
545 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700546}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100547EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700548
Miklos Szeredibafa9652006-06-25 05:48:51 -0700549void fuse_conn_put(struct fuse_conn *fc)
550{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700551 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800552 if (fc->destroy_req)
553 fuse_request_free(fc->destroy_req);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700554 mutex_destroy(&fc->inst_mutex);
Tejun Heo43901aa2008-11-26 12:03:56 +0100555 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700556 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700557}
Tejun Heo08cbf542009-04-14 10:54:53 +0900558EXPORT_SYMBOL_GPL(fuse_conn_put);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700559
560struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
561{
562 atomic_inc(&fc->count);
563 return fc;
564}
Tejun Heo08cbf542009-04-14 10:54:53 +0900565EXPORT_SYMBOL_GPL(fuse_conn_get);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700566
Tejun Heob93f8582008-11-26 12:03:55 +0100567static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700568{
569 struct fuse_attr attr;
570 memset(&attr, 0, sizeof(attr));
571
572 attr.mode = mode;
573 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700574 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700575 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700576}
577
Miklos Szeredi1729a162008-11-26 12:03:54 +0100578struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700579 u64 nodeid;
580 u32 generation;
581};
582
583static struct dentry *fuse_get_dentry(struct super_block *sb,
584 struct fuse_inode_handle *handle)
585{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700586 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700587 struct inode *inode;
588 struct dentry *entry;
589 int err = -ESTALE;
590
591 if (handle->nodeid == 0)
592 goto out_err;
593
594 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700595 if (!inode) {
596 struct fuse_entry_out outarg;
597 struct qstr name;
598
599 if (!fc->export_support)
600 goto out_err;
601
602 name.len = 1;
603 name.name = ".";
604 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
605 &inode);
606 if (err && err != -ENOENT)
607 goto out_err;
608 if (err || !inode) {
609 err = -ESTALE;
610 goto out_err;
611 }
612 err = -EIO;
613 if (get_node_id(inode) != handle->nodeid)
614 goto out_iput;
615 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700616 err = -ESTALE;
617 if (inode->i_generation != handle->generation)
618 goto out_iput;
619
Christoph Hellwig44003722008-08-11 15:49:04 +0200620 entry = d_obtain_alias(inode);
621 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700622 entry->d_op = &fuse_dentry_operations;
623 fuse_invalidate_entry_cache(entry);
624 }
625
626 return entry;
627
628 out_iput:
629 iput(inode);
630 out_err:
631 return ERR_PTR(err);
632}
633
634static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
635 int connectable)
636{
637 struct inode *inode = dentry->d_inode;
638 bool encode_parent = connectable && !S_ISDIR(inode->i_mode);
639 int len = encode_parent ? 6 : 3;
640 u64 nodeid;
641 u32 generation;
642
643 if (*max_len < len)
644 return 255;
645
646 nodeid = get_fuse_inode(inode)->nodeid;
647 generation = inode->i_generation;
648
649 fh[0] = (u32)(nodeid >> 32);
650 fh[1] = (u32)(nodeid & 0xffffffff);
651 fh[2] = generation;
652
653 if (encode_parent) {
654 struct inode *parent;
655
656 spin_lock(&dentry->d_lock);
657 parent = dentry->d_parent->d_inode;
658 nodeid = get_fuse_inode(parent)->nodeid;
659 generation = parent->i_generation;
660 spin_unlock(&dentry->d_lock);
661
662 fh[3] = (u32)(nodeid >> 32);
663 fh[4] = (u32)(nodeid & 0xffffffff);
664 fh[5] = generation;
665 }
666
667 *max_len = len;
668 return encode_parent ? 0x82 : 0x81;
669}
670
671static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
672 struct fid *fid, int fh_len, int fh_type)
673{
674 struct fuse_inode_handle handle;
675
676 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
677 return NULL;
678
679 handle.nodeid = (u64) fid->raw[0] << 32;
680 handle.nodeid |= (u64) fid->raw[1];
681 handle.generation = fid->raw[2];
682 return fuse_get_dentry(sb, &handle);
683}
684
685static struct dentry *fuse_fh_to_parent(struct super_block *sb,
686 struct fid *fid, int fh_len, int fh_type)
687{
688 struct fuse_inode_handle parent;
689
690 if (fh_type != 0x82 || fh_len < 6)
691 return NULL;
692
693 parent.nodeid = (u64) fid->raw[3] << 32;
694 parent.nodeid |= (u64) fid->raw[4];
695 parent.generation = fid->raw[5];
696 return fuse_get_dentry(sb, &parent);
697}
698
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700699static struct dentry *fuse_get_parent(struct dentry *child)
700{
701 struct inode *child_inode = child->d_inode;
702 struct fuse_conn *fc = get_fuse_conn(child_inode);
703 struct inode *inode;
704 struct dentry *parent;
705 struct fuse_entry_out outarg;
706 struct qstr name;
707 int err;
708
709 if (!fc->export_support)
710 return ERR_PTR(-ESTALE);
711
712 name.len = 2;
713 name.name = "..";
714 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
715 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200716 if (err) {
717 if (err == -ENOENT)
718 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700719 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700720 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200721
722 parent = d_obtain_alias(inode);
723 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) {
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700724 parent->d_op = &fuse_dentry_operations;
725 fuse_invalidate_entry_cache(parent);
726 }
727
728 return parent;
729}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700730
731static const struct export_operations fuse_export_operations = {
732 .fh_to_dentry = fuse_fh_to_dentry,
733 .fh_to_parent = fuse_fh_to_parent,
734 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700735 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700736};
737
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800738static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700739 .alloc_inode = fuse_alloc_inode,
740 .destroy_inode = fuse_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400741 .evict_inode = fuse_evict_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700742 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700743 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700744 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800745 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700746 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700747 .show_options = fuse_show_options,
748};
749
Csaba Henk487ea5a2009-08-26 19:17:22 +0200750static void sanitize_global_limit(unsigned *limit)
751{
752 if (*limit == 0)
753 *limit = ((num_physpages << PAGE_SHIFT) >> 13) /
754 sizeof(struct fuse_req);
755
756 if (*limit >= 1 << 16)
757 *limit = (1 << 16) - 1;
758}
759
760static int set_global_limit(const char *val, struct kernel_param *kp)
761{
762 int rv;
763
764 rv = param_set_uint(val, kp);
765 if (rv)
766 return rv;
767
768 sanitize_global_limit((unsigned *)kp->arg);
769
770 return 0;
771}
772
773static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
774{
775 int cap_sys_admin = capable(CAP_SYS_ADMIN);
776
777 if (arg->minor < 13)
778 return;
779
780 sanitize_global_limit(&max_user_bgreq);
781 sanitize_global_limit(&max_user_congthresh);
782
783 if (arg->max_background) {
784 fc->max_background = arg->max_background;
785
786 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
787 fc->max_background = max_user_bgreq;
788 }
789 if (arg->congestion_threshold) {
790 fc->congestion_threshold = arg->congestion_threshold;
791
792 if (!cap_sys_admin &&
793 fc->congestion_threshold > max_user_congthresh)
794 fc->congestion_threshold = max_user_congthresh;
795 }
796}
797
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800798static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
799{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800800 struct fuse_init_out *arg = &req->misc.init_out;
801
802 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
803 fc->conn_error = 1;
804 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800805 unsigned long ra_pages;
806
Csaba Henk487ea5a2009-08-26 19:17:22 +0200807 process_init_limits(fc, arg);
808
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800809 if (arg->minor >= 6) {
810 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
811 if (arg->flags & FUSE_ASYNC_READ)
812 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700813 if (!(arg->flags & FUSE_POSIX_LOCKS))
814 fc->no_lock = 1;
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700815 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
816 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700817 if (arg->minor >= 9) {
818 /* LOOKUP has dependency on proto version */
819 if (arg->flags & FUSE_EXPORT_SUPPORT)
820 fc->export_support = 1;
821 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700822 if (arg->flags & FUSE_BIG_WRITES)
823 fc->big_writes = 1;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200824 if (arg->flags & FUSE_DONT_MASK)
825 fc->dont_mask = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700826 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800827 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700828 fc->no_lock = 1;
829 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800830
831 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800832 fc->minor = arg->minor;
833 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200834 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800835 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800836 }
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700837 fc->blocked = 0;
838 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800839}
840
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700841static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800842{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800843 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800844
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800845 arg->major = FUSE_KERNEL_VERSION;
846 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800847 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700848 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200849 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800850 req->in.h.opcode = FUSE_INIT;
851 req->in.numargs = 1;
852 req->in.args[0].size = sizeof(*arg);
853 req->in.args[0].value = arg;
854 req->out.numargs = 1;
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800855 /* Variable length argument used for backward compatibility
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800856 with interface version < 7.5. Rest of init_out is zeroed
857 by do_get_request(), so a short reply is not a problem */
858 req->out.argvar = 1;
859 req->out.args[0].size = sizeof(struct fuse_init_out);
860 req->out.args[0].value = &req->misc.init_out;
861 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100862 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800863}
864
Tejun Heo43901aa2008-11-26 12:03:56 +0100865static void fuse_free_conn(struct fuse_conn *fc)
866{
867 kfree(fc);
868}
869
Tejun Heoa325f9b2009-04-14 10:54:52 +0900870static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
871{
872 int err;
873
Jens Axboed9938312009-06-12 14:45:52 +0200874 fc->bdi.name = "fuse";
Tejun Heoa325f9b2009-04-14 10:54:52 +0900875 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
876 fc->bdi.unplug_io_fn = default_unplug_io_fn;
877 /* fuse does it's own writeback accounting */
878 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
879
880 err = bdi_init(&fc->bdi);
881 if (err)
882 return err;
883
884 fc->bdi_initialized = 1;
885
886 if (sb->s_bdev) {
887 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
888 MAJOR(fc->dev), MINOR(fc->dev));
889 } else {
890 err = bdi_register_dev(&fc->bdi, fc->dev);
891 }
892
893 if (err)
894 return err;
895
896 /*
897 * For a single fuse filesystem use max 1% of dirty +
898 * writeback threshold.
899 *
900 * This gives about 1M of write buffer for memory maps on a
901 * machine with 1G and 10% dirty_ratio, which should be more
902 * than enough.
903 *
904 * Privileged users can raise it by writing to
905 *
906 * /sys/class/bdi/<bdi>/max_ratio
907 */
908 bdi_set_max_ratio(&fc->bdi, 1);
909
910 return 0;
911}
912
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700913static int fuse_fill_super(struct super_block *sb, void *data, int silent)
914{
915 struct fuse_conn *fc;
916 struct inode *root;
917 struct fuse_mount_data d;
918 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800919 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700920 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700921 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -0800922 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700923
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100924 err = -EINVAL;
Miklos Szeredi71421252006-06-25 05:48:52 -0700925 if (sb->s_flags & MS_MANDLOCK)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100926 goto err;
Miklos Szeredi71421252006-06-25 05:48:52 -0700927
Miklos Szeredid8091612006-12-06 20:35:48 -0800928 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100929 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700930
Miklos Szeredid8091612006-12-06 20:35:48 -0800931 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800932#ifdef CONFIG_BLOCK
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100933 err = -EINVAL;
Miklos Szeredid8091612006-12-06 20:35:48 -0800934 if (!sb_set_blocksize(sb, d.blksize))
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100935 goto err;
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800936#endif
Miklos Szeredid8091612006-12-06 20:35:48 -0800937 } else {
938 sb->s_blocksize = PAGE_CACHE_SIZE;
939 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
940 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700941 sb->s_magic = FUSE_SUPER_MAGIC;
942 sb->s_op = &fuse_super_operations;
943 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700944 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700945
946 file = fget(d.fd);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100947 err = -EINVAL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700948 if (!file)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100949 goto err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700950
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100951 if (file->f_op != &fuse_dev_operations)
952 goto err_fput;
Miklos Szeredi0720b312006-04-10 22:54:55 -0700953
Tejun Heo0d179aa2008-11-26 12:03:55 +0100954 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100955 err = -ENOMEM;
956 if (!fc)
957 goto err_fput;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700958
Tejun Heoa325f9b2009-04-14 10:54:52 +0900959 fuse_conn_init(fc);
960
961 fc->dev = sb->s_dev;
John Muir3b463ae2009-05-31 11:13:57 -0400962 fc->sb = sb;
Tejun Heoa325f9b2009-04-14 10:54:52 +0900963 err = fuse_bdi_init(fc, sb);
964 if (err)
965 goto err_put_conn;
Tejun Heo0d179aa2008-11-26 12:03:55 +0100966
Jens Axboe32a88aa2009-09-16 15:02:33 +0200967 sb->s_bdi = &fc->bdi;
968
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200969 /* Handle umasking inside the fuse code */
970 if (sb->s_flags & MS_POSIXACL)
971 fc->dont_mask = 1;
972 sb->s_flags |= MS_POSIXACL;
973
Tejun Heo43901aa2008-11-26 12:03:56 +0100974 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700975 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700976 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700977 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +0200978 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700979
Miklos Szeredif543f252006-01-16 22:14:35 -0800980 /* Used by get_root_inode() */
981 sb->s_fs_info = fc;
982
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700983 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +0100984 root = fuse_get_root_inode(sb, d.rootmode);
Miklos Szeredif543f252006-01-16 22:14:35 -0800985 if (!root)
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100986 goto err_put_conn;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700987
Miklos Szeredif543f252006-01-16 22:14:35 -0800988 root_dentry = d_alloc_root(root);
989 if (!root_dentry) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700990 iput(root);
Miklos Szeredic2b8f002009-01-26 15:00:58 +0100991 goto err_put_conn;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700992 }
Miklos Szeredif543f252006-01-16 22:14:35 -0800993
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700994 init_req = fuse_request_alloc();
995 if (!init_req)
996 goto err_put_root;
997
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800998 if (is_bdev) {
999 fc->destroy_req = fuse_request_alloc();
1000 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +02001001 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -08001002 }
1003
Miklos Szeredibafa9652006-06-25 05:48:51 -07001004 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001005 err = -EINVAL;
1006 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -07001007 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +02001008
Miklos Szeredibafa9652006-06-25 05:48:51 -07001009 err = fuse_ctl_add_conn(fc);
1010 if (err)
1011 goto err_unlock;
1012
1013 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -08001014 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -08001015 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -07001016 file->private_data = fuse_conn_get(fc);
1017 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -07001018 /*
1019 * atomic_dec_and_test() in fput() provides the necessary
1020 * memory barrier for file->private_data to be visible on all
1021 * CPUs after this
1022 */
1023 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -08001024
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001025 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001026
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001027 return 0;
1028
Miklos Szeredibafa9652006-06-25 05:48:51 -07001029 err_unlock:
1030 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +02001031 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001032 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -08001033 err_put_root:
1034 dput(root_dentry);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001035 err_put_conn:
Tejun Heoa325f9b2009-04-14 10:54:52 +09001036 fuse_bdi_destroy(fc);
Miklos Szeredibafa9652006-06-25 05:48:51 -07001037 fuse_conn_put(fc);
Miklos Szeredic2b8f002009-01-26 15:00:58 +01001038 err_fput:
1039 fput(file);
1040 err:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001041 return err;
1042}
1043
David Howells454e2392006-06-23 02:02:57 -07001044static int fuse_get_sb(struct file_system_type *fs_type,
1045 int flags, const char *dev_name,
1046 void *raw_data, struct vfsmount *mnt)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001047{
David Howells454e2392006-06-23 02:02:57 -07001048 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001049}
1050
John Muir3b463ae2009-05-31 11:13:57 -04001051static void fuse_kill_sb_anon(struct super_block *sb)
1052{
1053 struct fuse_conn *fc = get_fuse_conn_super(sb);
1054
1055 if (fc) {
1056 down_write(&fc->killsb);
1057 fc->sb = NULL;
1058 up_write(&fc->killsb);
1059 }
1060
1061 kill_anon_super(sb);
1062}
1063
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001064static struct file_system_type fuse_fs_type = {
1065 .owner = THIS_MODULE,
1066 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001067 .fs_flags = FS_HAS_SUBTYPE,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001068 .get_sb = fuse_get_sb,
John Muir3b463ae2009-05-31 11:13:57 -04001069 .kill_sb = fuse_kill_sb_anon,
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001070};
1071
1072#ifdef CONFIG_BLOCK
Miklos Szeredid6392f82006-12-06 20:35:44 -08001073static int fuse_get_sb_blk(struct file_system_type *fs_type,
1074 int flags, const char *dev_name,
1075 void *raw_data, struct vfsmount *mnt)
1076{
1077 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
1078 mnt);
1079}
1080
John Muir3b463ae2009-05-31 11:13:57 -04001081static void fuse_kill_sb_blk(struct super_block *sb)
1082{
1083 struct fuse_conn *fc = get_fuse_conn_super(sb);
1084
1085 if (fc) {
1086 down_write(&fc->killsb);
1087 fc->sb = NULL;
1088 up_write(&fc->killsb);
1089 }
1090
1091 kill_block_super(sb);
1092}
1093
Miklos Szeredid6392f82006-12-06 20:35:44 -08001094static struct file_system_type fuseblk_fs_type = {
1095 .owner = THIS_MODULE,
1096 .name = "fuseblk",
1097 .get_sb = fuse_get_sb_blk,
John Muir3b463ae2009-05-31 11:13:57 -04001098 .kill_sb = fuse_kill_sb_blk,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -07001099 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -08001100};
1101
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001102static inline int register_fuseblk(void)
1103{
1104 return register_filesystem(&fuseblk_fs_type);
1105}
1106
1107static inline void unregister_fuseblk(void)
1108{
1109 unregister_filesystem(&fuseblk_fs_type);
1110}
1111#else
1112static inline int register_fuseblk(void)
1113{
1114 return 0;
1115}
1116
1117static inline void unregister_fuseblk(void)
1118{
1119}
1120#endif
1121
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001122static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001123{
Miklos Szeredi1729a162008-11-26 12:03:54 +01001124 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001125
Christoph Lametera35afb82007-05-16 22:10:57 -07001126 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001127}
1128
1129static int __init fuse_fs_init(void)
1130{
1131 int err;
1132
1133 err = register_filesystem(&fuse_fs_type);
1134 if (err)
Miklos Szeredid6392f82006-12-06 20:35:44 -08001135 goto out;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001136
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001137 err = register_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -08001138 if (err)
1139 goto out_unreg;
1140
1141 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1142 sizeof(struct fuse_inode),
1143 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001144 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -08001145 err = -ENOMEM;
1146 if (!fuse_inode_cachep)
1147 goto out_unreg2;
1148
1149 return 0;
1150
1151 out_unreg2:
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001152 unregister_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -08001153 out_unreg:
1154 unregister_filesystem(&fuse_fs_type);
1155 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001156 return err;
1157}
1158
1159static void fuse_fs_cleanup(void)
1160{
1161 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001162 unregister_fuseblk();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001163 kmem_cache_destroy(fuse_inode_cachep);
1164}
1165
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001166static struct kobject *fuse_kobj;
1167static struct kobject *connections_kobj;
1168
Miklos Szeredif543f252006-01-16 22:14:35 -08001169static int fuse_sysfs_init(void)
1170{
1171 int err;
1172
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001173 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001174 if (!fuse_kobj) {
1175 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001176 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001177 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001178
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001179 connections_kobj = kobject_create_and_add("connections", fuse_kobj);
1180 if (!connections_kobj) {
1181 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001182 goto out_fuse_unregister;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001183 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001184
1185 return 0;
1186
1187 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001188 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001189 out_err:
1190 return err;
1191}
1192
1193static void fuse_sysfs_cleanup(void)
1194{
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001195 kobject_put(connections_kobj);
1196 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001197}
1198
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001199static int __init fuse_init(void)
1200{
1201 int res;
1202
Miklos Szeredi1729a162008-11-26 12:03:54 +01001203 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001204 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1205
Miklos Szeredibafa9652006-06-25 05:48:51 -07001206 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001207 res = fuse_fs_init();
1208 if (res)
1209 goto err;
1210
Miklos Szeredi334f4852005-09-09 13:10:27 -07001211 res = fuse_dev_init();
1212 if (res)
1213 goto err_fs_cleanup;
1214
Miklos Szeredif543f252006-01-16 22:14:35 -08001215 res = fuse_sysfs_init();
1216 if (res)
1217 goto err_dev_cleanup;
1218
Miklos Szeredibafa9652006-06-25 05:48:51 -07001219 res = fuse_ctl_init();
1220 if (res)
1221 goto err_sysfs_cleanup;
1222
Csaba Henk487ea5a2009-08-26 19:17:22 +02001223 sanitize_global_limit(&max_user_bgreq);
1224 sanitize_global_limit(&max_user_congthresh);
1225
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001226 return 0;
1227
Miklos Szeredibafa9652006-06-25 05:48:51 -07001228 err_sysfs_cleanup:
1229 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001230 err_dev_cleanup:
1231 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001232 err_fs_cleanup:
1233 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001234 err:
1235 return res;
1236}
1237
1238static void __exit fuse_exit(void)
1239{
1240 printk(KERN_DEBUG "fuse exit\n");
1241
Miklos Szeredibafa9652006-06-25 05:48:51 -07001242 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001243 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001244 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001245 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001246}
1247
1248module_init(fuse_init);
1249module_exit(fuse_exit);