blob: 47c96fdca1ac69afbf7f7eb841a9a50690754ee7 [file] [log] [blame]
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>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070017#include <linux/parser.h>
18#include <linux/statfs.h>
Miklos Szeredi9c8ef562006-06-25 05:48:55 -070019#include <linux/random.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040020#include <linux/sched.h>
Miklos Szeredidbd561d2008-07-25 01:49:00 -070021#include <linux/exportfs.h>
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070022
23MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
24MODULE_DESCRIPTION("Filesystem in Userspace");
25MODULE_LICENSE("GPL");
26
Christoph Lametere18b8902006-12-06 20:33:20 -080027static struct kmem_cache *fuse_inode_cachep;
Miklos Szeredibafa9652006-06-25 05:48:51 -070028struct list_head fuse_conn_list;
29DEFINE_MUTEX(fuse_mutex);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070030
31#define FUSE_SUPER_MAGIC 0x65735546
32
Miklos Szeredid1875db2008-02-08 04:21:43 -080033#define FUSE_DEFAULT_BLKSIZE 512
34
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070035struct fuse_mount_data {
36 int fd;
37 unsigned rootmode;
38 unsigned user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -070039 unsigned group_id;
Miklos Szeredi1729a162008-11-26 12:03:54 +010040 unsigned fd_present:1;
41 unsigned rootmode_present:1;
42 unsigned user_id_present:1;
43 unsigned group_id_present:1;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -070044 unsigned flags;
Miklos Szeredidb50b962005-09-09 13:10:33 -070045 unsigned max_read;
Miklos Szeredid8091612006-12-06 20:35:48 -080046 unsigned blksize;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070047};
48
49static struct inode *fuse_alloc_inode(struct super_block *sb)
50{
51 struct inode *inode;
52 struct fuse_inode *fi;
53
Christoph Lametere94b1762006-12-06 20:33:17 -080054 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070055 if (!inode)
56 return NULL;
57
58 fi = get_fuse_inode(inode);
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070059 fi->i_time = 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070060 fi->nodeid = 0;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070061 fi->nlookup = 0;
John Muirfbee36b2007-11-28 16:22:02 -080062 fi->attr_version = 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -070063 fi->writectr = 0;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070064 INIT_LIST_HEAD(&fi->write_files);
Miklos Szeredi3be5a522008-04-30 00:54:41 -070065 INIT_LIST_HEAD(&fi->queued_writes);
66 INIT_LIST_HEAD(&fi->writepages);
67 init_waitqueue_head(&fi->page_waitq);
Miklos Szeredie5e55582005-09-09 13:10:28 -070068 fi->forget_req = fuse_request_alloc();
69 if (!fi->forget_req) {
70 kmem_cache_free(fuse_inode_cachep, inode);
71 return NULL;
72 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070073
74 return inode;
75}
76
77static void fuse_destroy_inode(struct inode *inode)
78{
Miklos Szeredie5e55582005-09-09 13:10:28 -070079 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -070080 BUG_ON(!list_empty(&fi->write_files));
Miklos Szeredi3be5a522008-04-30 00:54:41 -070081 BUG_ON(!list_empty(&fi->queued_writes));
Miklos Szeredie5e55582005-09-09 13:10:28 -070082 if (fi->forget_req)
83 fuse_request_free(fi->forget_req);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -070084 kmem_cache_free(fuse_inode_cachep, inode);
85}
86
Miklos Szeredie5e55582005-09-09 13:10:28 -070087void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
Miklos Szeredib48badf2008-04-30 00:54:44 -070088 u64 nodeid, u64 nlookup)
Miklos Szeredie5e55582005-09-09 13:10:28 -070089{
90 struct fuse_forget_in *inarg = &req->misc.forget_in;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -070091 inarg->nlookup = nlookup;
Miklos Szeredie5e55582005-09-09 13:10:28 -070092 req->in.h.opcode = FUSE_FORGET;
93 req->in.h.nodeid = nodeid;
94 req->in.numargs = 1;
95 req->in.args[0].size = sizeof(struct fuse_forget_in);
96 req->in.args[0].value = inarg;
Tejun Heob93f8582008-11-26 12:03:55 +010097 fuse_request_send_noreply(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -070098}
99
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700100static void fuse_clear_inode(struct inode *inode)
101{
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700102 if (inode->i_sb->s_flags & MS_ACTIVE) {
103 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700104 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700105 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700106 fi->forget_req = NULL;
107 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700108}
109
Miklos Szeredi71421252006-06-25 05:48:52 -0700110static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
111{
112 if (*flags & MS_MANDLOCK)
113 return -EINVAL;
114
115 return 0;
116}
117
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700118void fuse_truncate(struct address_space *mapping, loff_t offset)
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700119{
120 /* See vmtruncate() */
121 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
122 truncate_inode_pages(mapping, offset);
123 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
124}
125
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700126void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
127 u64 attr_valid)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700128{
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700129 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700130 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700131
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700132 fi->attr_version = ++fc->attr_version;
133 fi->i_time = attr_valid;
134
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700135 inode->i_ino = attr->ino;
Miklos Szerediebc14c42007-10-16 23:31:03 -0700136 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700137 inode->i_nlink = attr->nlink;
138 inode->i_uid = attr->uid;
139 inode->i_gid = attr->gid;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700140 inode->i_blocks = attr->blocks;
141 inode->i_atime.tv_sec = attr->atime;
142 inode->i_atime.tv_nsec = attr->atimensec;
143 inode->i_mtime.tv_sec = attr->mtime;
144 inode->i_mtime.tv_nsec = attr->mtimensec;
145 inode->i_ctime.tv_sec = attr->ctime;
146 inode->i_ctime.tv_nsec = attr->ctimensec;
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700147
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700148 if (attr->blksize != 0)
149 inode->i_blkbits = ilog2(attr->blksize);
150 else
151 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
152
Miklos Szerediebc14c42007-10-16 23:31:03 -0700153 /*
154 * Don't set the sticky bit in i_mode, unless we want the VFS
155 * to check permissions. This prevents failures due to the
156 * check in may_delete().
157 */
158 fi->orig_i_mode = inode->i_mode;
159 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
160 inode->i_mode &= ~S_ISVTX;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700161}
162
163void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
164 u64 attr_valid, u64 attr_version)
165{
166 struct fuse_conn *fc = get_fuse_conn(inode);
167 struct fuse_inode *fi = get_fuse_inode(inode);
168 loff_t oldsize;
169
170 spin_lock(&fc->lock);
171 if (attr_version != 0 && fi->attr_version > attr_version) {
172 spin_unlock(&fc->lock);
173 return;
174 }
175
176 fuse_change_attributes_common(inode, attr, attr_valid);
Miklos Szerediebc14c42007-10-16 23:31:03 -0700177
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700178 oldsize = inode->i_size;
179 i_size_write(inode, attr->size);
180 spin_unlock(&fc->lock);
181
182 if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
183 if (attr->size < oldsize)
184 fuse_truncate(inode->i_mapping, attr->size);
Miklos Szeredib1009972007-10-16 23:31:01 -0700185 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredie00d2c22007-10-16 23:31:01 -0700186 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700187}
188
189static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
190{
191 inode->i_mode = attr->mode & S_IFMT;
Miklos Szeredi9ffbb912006-10-17 00:10:06 -0700192 inode->i_size = attr->size;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700193 if (S_ISREG(inode->i_mode)) {
194 fuse_init_common(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700195 fuse_init_file_inode(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700196 } else if (S_ISDIR(inode->i_mode))
197 fuse_init_dir(inode);
198 else if (S_ISLNK(inode->i_mode))
199 fuse_init_symlink(inode);
200 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
201 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
202 fuse_init_common(inode);
203 init_special_inode(inode, inode->i_mode,
204 new_decode_dev(attr->rdev));
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800205 } else
206 BUG();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700207}
208
209static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
210{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700211 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700212 if (get_node_id(inode) == nodeid)
213 return 1;
214 else
215 return 0;
216}
217
218static int fuse_inode_set(struct inode *inode, void *_nodeidp)
219{
Miklos Szeredib48badf2008-04-30 00:54:44 -0700220 u64 nodeid = *(u64 *) _nodeidp;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700221 get_fuse_inode(inode)->nodeid = nodeid;
222 return 0;
223}
224
Miklos Szeredib48badf2008-04-30 00:54:44 -0700225struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700226 int generation, struct fuse_attr *attr,
227 u64 attr_valid, u64 attr_version)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700228{
229 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700230 struct fuse_inode *fi;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700231 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700232
233 retry:
234 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
235 if (!inode)
236 return NULL;
237
238 if ((inode->i_state & I_NEW)) {
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700239 inode->i_flags |= S_NOATIME|S_NOCMTIME;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700240 inode->i_generation = generation;
241 inode->i_data.backing_dev_info = &fc->bdi;
242 fuse_init_inode(inode, attr);
243 unlock_new_inode(inode);
244 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700245 /* Inode has changed type, any I/O on the old should fail */
246 make_bad_inode(inode);
247 iput(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700248 goto retry;
249 }
250
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700251 fi = get_fuse_inode(inode);
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700252 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100253 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700254 spin_unlock(&fc->lock);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700255 fuse_change_attributes(inode, attr, attr_valid, attr_version);
256
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700257 return inode;
258}
259
Al Viro42faad92008-04-24 07:21:56 -0400260static void fuse_umount_begin(struct super_block *sb)
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800261{
Al Viro42faad92008-04-24 07:21:56 -0400262 fuse_abort_conn(get_fuse_conn_super(sb));
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800263}
264
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800265static void fuse_send_destroy(struct fuse_conn *fc)
266{
267 struct fuse_req *req = fc->destroy_req;
268 if (req && fc->conn_init) {
269 fc->destroy_req = NULL;
270 req->in.h.opcode = FUSE_DESTROY;
271 req->force = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100272 fuse_request_send(fc, req);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800273 fuse_put_request(fc, req);
274 }
275}
276
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700277static void fuse_put_super(struct super_block *sb)
278{
279 struct fuse_conn *fc = get_fuse_conn_super(sb);
280
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800281 fuse_send_destroy(fc);
Miklos Szeredid7133112006-04-10 22:54:55 -0700282 spin_lock(&fc->lock);
Miklos Szeredi9ba7cbb2006-01-16 22:14:34 -0800283 fc->connected = 0;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700284 fc->blocked = 0;
Miklos Szeredid7133112006-04-10 22:54:55 -0700285 spin_unlock(&fc->lock);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700286 /* Flush all readers on this fs */
Jeff Dike385a17b2006-04-10 22:54:52 -0700287 kill_fasync(&fc->fasync, SIGIO, POLL_IN);
Miklos Szeredi334f4852005-09-09 13:10:27 -0700288 wake_up_all(&fc->waitq);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700289 wake_up_all(&fc->blocked_waitq);
Miklos Szeredide5e3de2007-10-16 23:31:00 -0700290 wake_up_all(&fc->reserved_req_waitq);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700291 mutex_lock(&fuse_mutex);
292 list_del(&fc->entry);
293 fuse_ctl_remove_conn(fc);
294 mutex_unlock(&fuse_mutex);
295 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700296}
297
Miklos Szeredie5e55582005-09-09 13:10:28 -0700298static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
299{
300 stbuf->f_type = FUSE_SUPER_MAGIC;
301 stbuf->f_bsize = attr->bsize;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800302 stbuf->f_frsize = attr->frsize;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700303 stbuf->f_blocks = attr->blocks;
304 stbuf->f_bfree = attr->bfree;
305 stbuf->f_bavail = attr->bavail;
306 stbuf->f_files = attr->files;
307 stbuf->f_ffree = attr->ffree;
308 stbuf->f_namelen = attr->namelen;
309 /* fsid is left zero */
310}
311
David Howells726c3342006-06-23 02:02:58 -0700312static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700313{
David Howells726c3342006-06-23 02:02:58 -0700314 struct super_block *sb = dentry->d_sb;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700315 struct fuse_conn *fc = get_fuse_conn_super(sb);
316 struct fuse_req *req;
317 struct fuse_statfs_out outarg;
318 int err;
319
Miklos Szeredie57ac682007-10-18 03:06:58 -0700320 if (!fuse_allow_task(fc, current)) {
321 buf->f_type = FUSE_SUPER_MAGIC;
322 return 0;
323 }
324
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700325 req = fuse_get_req(fc);
326 if (IS_ERR(req))
327 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700328
Miklos Szeredide5f1202006-01-06 00:19:37 -0800329 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700330 req->in.numargs = 0;
331 req->in.h.opcode = FUSE_STATFS;
Miklos Szeredi5b35e8e2006-09-29 01:59:34 -0700332 req->in.h.nodeid = get_node_id(dentry->d_inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700333 req->out.numargs = 1;
Miklos Szeredide5f1202006-01-06 00:19:37 -0800334 req->out.args[0].size =
335 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700336 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100337 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700338 err = req->out.h.error;
339 if (!err)
340 convert_fuse_statfs(buf, &outarg.st);
341 fuse_put_request(fc, req);
342 return err;
343}
344
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700345enum {
346 OPT_FD,
347 OPT_ROOTMODE,
348 OPT_USER_ID,
Miklos Szeredi87729a52005-09-09 13:10:34 -0700349 OPT_GROUP_ID,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700350 OPT_DEFAULT_PERMISSIONS,
351 OPT_ALLOW_OTHER,
Miklos Szeredidb50b962005-09-09 13:10:33 -0700352 OPT_MAX_READ,
Miklos Szeredid8091612006-12-06 20:35:48 -0800353 OPT_BLKSIZE,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700354 OPT_ERR
355};
356
Steven Whitehousea447c092008-10-13 10:46:57 +0100357static const match_table_t tokens = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700358 {OPT_FD, "fd=%u"},
359 {OPT_ROOTMODE, "rootmode=%o"},
360 {OPT_USER_ID, "user_id=%u"},
Miklos Szeredi87729a52005-09-09 13:10:34 -0700361 {OPT_GROUP_ID, "group_id=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700362 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
363 {OPT_ALLOW_OTHER, "allow_other"},
Miklos Szeredidb50b962005-09-09 13:10:33 -0700364 {OPT_MAX_READ, "max_read=%u"},
Miklos Szeredid8091612006-12-06 20:35:48 -0800365 {OPT_BLKSIZE, "blksize=%u"},
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700366 {OPT_ERR, NULL}
367};
368
Miklos Szeredid8091612006-12-06 20:35:48 -0800369static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700370{
371 char *p;
372 memset(d, 0, sizeof(struct fuse_mount_data));
Miklos Szeredidb50b962005-09-09 13:10:33 -0700373 d->max_read = ~0;
Miklos Szeredid1875db2008-02-08 04:21:43 -0800374 d->blksize = FUSE_DEFAULT_BLKSIZE;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700375
376 while ((p = strsep(&opt, ",")) != NULL) {
377 int token;
378 int value;
379 substring_t args[MAX_OPT_ARGS];
380 if (!*p)
381 continue;
382
383 token = match_token(p, tokens, args);
384 switch (token) {
385 case OPT_FD:
386 if (match_int(&args[0], &value))
387 return 0;
388 d->fd = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700389 d->fd_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700390 break;
391
392 case OPT_ROOTMODE:
393 if (match_octal(&args[0], &value))
394 return 0;
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700395 if (!fuse_valid_type(value))
396 return 0;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700397 d->rootmode = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700398 d->rootmode_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700399 break;
400
401 case OPT_USER_ID:
402 if (match_int(&args[0], &value))
403 return 0;
404 d->user_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700405 d->user_id_present = 1;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700406 break;
407
Miklos Szeredi87729a52005-09-09 13:10:34 -0700408 case OPT_GROUP_ID:
409 if (match_int(&args[0], &value))
410 return 0;
411 d->group_id = value;
Miklos Szeredi5a533682005-09-09 13:10:34 -0700412 d->group_id_present = 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700413 break;
414
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700415 case OPT_DEFAULT_PERMISSIONS:
416 d->flags |= FUSE_DEFAULT_PERMISSIONS;
417 break;
418
419 case OPT_ALLOW_OTHER:
420 d->flags |= FUSE_ALLOW_OTHER;
421 break;
422
Miklos Szeredidb50b962005-09-09 13:10:33 -0700423 case OPT_MAX_READ:
424 if (match_int(&args[0], &value))
425 return 0;
426 d->max_read = value;
427 break;
428
Miklos Szeredid8091612006-12-06 20:35:48 -0800429 case OPT_BLKSIZE:
430 if (!is_bdev || match_int(&args[0], &value))
431 return 0;
432 d->blksize = value;
433 break;
434
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700435 default:
436 return 0;
437 }
438 }
Miklos Szeredi5a533682005-09-09 13:10:34 -0700439
440 if (!d->fd_present || !d->rootmode_present ||
441 !d->user_id_present || !d->group_id_present)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700442 return 0;
443
444 return 1;
445}
446
447static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
448{
449 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
450
451 seq_printf(m, ",user_id=%u", fc->user_id);
Miklos Szeredi87729a52005-09-09 13:10:34 -0700452 seq_printf(m, ",group_id=%u", fc->group_id);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700453 if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
454 seq_puts(m, ",default_permissions");
455 if (fc->flags & FUSE_ALLOW_OTHER)
456 seq_puts(m, ",allow_other");
Miklos Szeredidb50b962005-09-09 13:10:33 -0700457 if (fc->max_read != ~0)
458 seq_printf(m, ",max_read=%u", fc->max_read);
Miklos Szeredid1875db2008-02-08 04:21:43 -0800459 if (mnt->mnt_sb->s_bdev &&
460 mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
461 seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700462 return 0;
463}
464
Tejun Heo0d179aa2008-11-26 12:03:55 +0100465int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700466{
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700467 int err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700468
Tejun Heo0d179aa2008-11-26 12:03:55 +0100469 memset(fc, 0, sizeof(*fc));
470 spin_lock_init(&fc->lock);
471 mutex_init(&fc->inst_mutex);
472 atomic_set(&fc->count, 1);
473 init_waitqueue_head(&fc->waitq);
474 init_waitqueue_head(&fc->blocked_waitq);
475 init_waitqueue_head(&fc->reserved_req_waitq);
476 INIT_LIST_HEAD(&fc->pending);
477 INIT_LIST_HEAD(&fc->processing);
478 INIT_LIST_HEAD(&fc->io);
479 INIT_LIST_HEAD(&fc->interrupts);
480 INIT_LIST_HEAD(&fc->bg_queue);
481 INIT_LIST_HEAD(&fc->entry);
482 atomic_set(&fc->num_waiting, 0);
483 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
484 fc->bdi.unplug_io_fn = default_unplug_io_fn;
485 /* fuse does it's own writeback accounting */
486 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
487 fc->khctr = 0;
488 fc->polled_files = RB_ROOT;
489 fc->dev = sb->s_dev;
490 err = bdi_init(&fc->bdi);
491 if (err)
492 goto error_mutex_destroy;
493 if (sb->s_bdev) {
494 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
495 MAJOR(fc->dev), MINOR(fc->dev));
496 } else {
497 err = bdi_register_dev(&fc->bdi, fc->dev);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700498 }
Tejun Heo0d179aa2008-11-26 12:03:55 +0100499 if (err)
500 goto error_bdi_destroy;
501 /*
502 * For a single fuse filesystem use max 1% of dirty +
503 * writeback threshold.
504 *
505 * This gives about 1M of write buffer for memory maps on a
506 * machine with 1G and 10% dirty_ratio, which should be more
507 * than enough.
508 *
509 * Privileged users can raise it by writing to
510 *
511 * /sys/class/bdi/<bdi>/max_ratio
512 */
513 bdi_set_max_ratio(&fc->bdi, 1);
514 fc->reqctr = 0;
515 fc->blocked = 1;
516 fc->attr_version = 1;
517 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
Miklos Szeredib6f2fcb2008-04-30 00:54:34 -0700518
Tejun Heo0d179aa2008-11-26 12:03:55 +0100519 return 0;
520
521 error_bdi_destroy:
Miklos Szeredib6f2fcb2008-04-30 00:54:34 -0700522 bdi_destroy(&fc->bdi);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100523 error_mutex_destroy:
Miklos Szeredib6f2fcb2008-04-30 00:54:34 -0700524 mutex_destroy(&fc->inst_mutex);
Tejun Heo0d179aa2008-11-26 12:03:55 +0100525 return err;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700526}
Tejun Heo0d179aa2008-11-26 12:03:55 +0100527EXPORT_SYMBOL_GPL(fuse_conn_init);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700528
Miklos Szeredibafa9652006-06-25 05:48:51 -0700529void fuse_conn_put(struct fuse_conn *fc)
530{
Miklos Szeredid2a85162006-10-17 00:10:11 -0700531 if (atomic_dec_and_test(&fc->count)) {
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800532 if (fc->destroy_req)
533 fuse_request_free(fc->destroy_req);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700534 mutex_destroy(&fc->inst_mutex);
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700535 bdi_destroy(&fc->bdi);
Tejun Heo43901aa2008-11-26 12:03:56 +0100536 fc->release(fc);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700537 }
Miklos Szeredibafa9652006-06-25 05:48:51 -0700538}
539
540struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
541{
542 atomic_inc(&fc->count);
543 return fc;
544}
545
Tejun Heob93f8582008-11-26 12:03:55 +0100546static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700547{
548 struct fuse_attr attr;
549 memset(&attr, 0, sizeof(attr));
550
551 attr.mode = mode;
552 attr.ino = FUSE_ROOT_ID;
Miklos Szeredi074406f2007-10-16 23:31:02 -0700553 attr.nlink = 1;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700554 return fuse_iget(sb, 1, 0, &attr, 0, 0);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700555}
556
Miklos Szeredi1729a162008-11-26 12:03:54 +0100557struct fuse_inode_handle {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700558 u64 nodeid;
559 u32 generation;
560};
561
562static struct dentry *fuse_get_dentry(struct super_block *sb,
563 struct fuse_inode_handle *handle)
564{
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700565 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700566 struct inode *inode;
567 struct dentry *entry;
568 int err = -ESTALE;
569
570 if (handle->nodeid == 0)
571 goto out_err;
572
573 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700574 if (!inode) {
575 struct fuse_entry_out outarg;
576 struct qstr name;
577
578 if (!fc->export_support)
579 goto out_err;
580
581 name.len = 1;
582 name.name = ".";
583 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
584 &inode);
585 if (err && err != -ENOENT)
586 goto out_err;
587 if (err || !inode) {
588 err = -ESTALE;
589 goto out_err;
590 }
591 err = -EIO;
592 if (get_node_id(inode) != handle->nodeid)
593 goto out_iput;
594 }
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700595 err = -ESTALE;
596 if (inode->i_generation != handle->generation)
597 goto out_iput;
598
Christoph Hellwig44003722008-08-11 15:49:04 +0200599 entry = d_obtain_alias(inode);
600 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) {
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700601 entry->d_op = &fuse_dentry_operations;
602 fuse_invalidate_entry_cache(entry);
603 }
604
605 return entry;
606
607 out_iput:
608 iput(inode);
609 out_err:
610 return ERR_PTR(err);
611}
612
613static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
614 int connectable)
615{
616 struct inode *inode = dentry->d_inode;
617 bool encode_parent = connectable && !S_ISDIR(inode->i_mode);
618 int len = encode_parent ? 6 : 3;
619 u64 nodeid;
620 u32 generation;
621
622 if (*max_len < len)
623 return 255;
624
625 nodeid = get_fuse_inode(inode)->nodeid;
626 generation = inode->i_generation;
627
628 fh[0] = (u32)(nodeid >> 32);
629 fh[1] = (u32)(nodeid & 0xffffffff);
630 fh[2] = generation;
631
632 if (encode_parent) {
633 struct inode *parent;
634
635 spin_lock(&dentry->d_lock);
636 parent = dentry->d_parent->d_inode;
637 nodeid = get_fuse_inode(parent)->nodeid;
638 generation = parent->i_generation;
639 spin_unlock(&dentry->d_lock);
640
641 fh[3] = (u32)(nodeid >> 32);
642 fh[4] = (u32)(nodeid & 0xffffffff);
643 fh[5] = generation;
644 }
645
646 *max_len = len;
647 return encode_parent ? 0x82 : 0x81;
648}
649
650static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
651 struct fid *fid, int fh_len, int fh_type)
652{
653 struct fuse_inode_handle handle;
654
655 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
656 return NULL;
657
658 handle.nodeid = (u64) fid->raw[0] << 32;
659 handle.nodeid |= (u64) fid->raw[1];
660 handle.generation = fid->raw[2];
661 return fuse_get_dentry(sb, &handle);
662}
663
664static struct dentry *fuse_fh_to_parent(struct super_block *sb,
665 struct fid *fid, int fh_len, int fh_type)
666{
667 struct fuse_inode_handle parent;
668
669 if (fh_type != 0x82 || fh_len < 6)
670 return NULL;
671
672 parent.nodeid = (u64) fid->raw[3] << 32;
673 parent.nodeid |= (u64) fid->raw[4];
674 parent.generation = fid->raw[5];
675 return fuse_get_dentry(sb, &parent);
676}
677
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700678static struct dentry *fuse_get_parent(struct dentry *child)
679{
680 struct inode *child_inode = child->d_inode;
681 struct fuse_conn *fc = get_fuse_conn(child_inode);
682 struct inode *inode;
683 struct dentry *parent;
684 struct fuse_entry_out outarg;
685 struct qstr name;
686 int err;
687
688 if (!fc->export_support)
689 return ERR_PTR(-ESTALE);
690
691 name.len = 2;
692 name.name = "..";
693 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
694 &name, &outarg, &inode);
Christoph Hellwig44003722008-08-11 15:49:04 +0200695 if (err) {
696 if (err == -ENOENT)
697 return ERR_PTR(-ESTALE);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700698 return ERR_PTR(err);
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700699 }
Christoph Hellwig44003722008-08-11 15:49:04 +0200700
701 parent = d_obtain_alias(inode);
702 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) {
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700703 parent->d_op = &fuse_dentry_operations;
704 fuse_invalidate_entry_cache(parent);
705 }
706
707 return parent;
708}
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700709
710static const struct export_operations fuse_export_operations = {
711 .fh_to_dentry = fuse_fh_to_dentry,
712 .fh_to_parent = fuse_fh_to_parent,
713 .encode_fh = fuse_encode_fh,
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700714 .get_parent = fuse_get_parent,
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700715};
716
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800717static const struct super_operations fuse_super_operations = {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700718 .alloc_inode = fuse_alloc_inode,
719 .destroy_inode = fuse_destroy_inode,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700720 .clear_inode = fuse_clear_inode,
Miklos Szerediead5f0b2007-05-23 13:57:54 -0700721 .drop_inode = generic_delete_inode,
Miklos Szeredi71421252006-06-25 05:48:52 -0700722 .remount_fs = fuse_remount_fs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700723 .put_super = fuse_put_super,
Miklos Szeredi69a53bf2006-01-16 22:14:41 -0800724 .umount_begin = fuse_umount_begin,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700725 .statfs = fuse_statfs,
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700726 .show_options = fuse_show_options,
727};
728
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800729static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
730{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800731 struct fuse_init_out *arg = &req->misc.init_out;
732
733 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
734 fc->conn_error = 1;
735 else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800736 unsigned long ra_pages;
737
738 if (arg->minor >= 6) {
739 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
740 if (arg->flags & FUSE_ASYNC_READ)
741 fc->async_read = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700742 if (!(arg->flags & FUSE_POSIX_LOCKS))
743 fc->no_lock = 1;
Miklos Szeredi6ff958e2007-10-18 03:07:02 -0700744 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
745 fc->atomic_o_trunc = 1;
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700746 if (arg->minor >= 9) {
747 /* LOOKUP has dependency on proto version */
748 if (arg->flags & FUSE_EXPORT_SUPPORT)
749 fc->export_support = 1;
750 }
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700751 if (arg->flags & FUSE_BIG_WRITES)
752 fc->big_writes = 1;
Miklos Szeredi71421252006-06-25 05:48:52 -0700753 } else {
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800754 ra_pages = fc->max_read / PAGE_CACHE_SIZE;
Miklos Szeredi71421252006-06-25 05:48:52 -0700755 fc->no_lock = 1;
756 }
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800757
758 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800759 fc->minor = arg->minor;
760 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
Miklos Szeredif948d562008-06-17 18:05:40 +0200761 fc->max_write = max_t(unsigned, 4096, fc->max_write);
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800762 fc->conn_init = 1;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800763 }
Miklos Szeredi08a53cd2006-04-10 22:54:59 -0700764 fc->blocked = 0;
765 wake_up_all(&fc->blocked_waitq);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800766}
767
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700768static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800769{
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800770 struct fuse_init_in *arg = &req->misc.init_in;
Miklos Szeredi095da6c2006-01-16 22:14:52 -0800771
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800772 arg->major = FUSE_KERNEL_VERSION;
773 arg->minor = FUSE_KERNEL_MINOR_VERSION;
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800774 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700775 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
Miklos Szeredi33670fa2008-07-25 01:49:02 -0700776 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES;
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800777 req->in.h.opcode = FUSE_INIT;
778 req->in.numargs = 1;
779 req->in.args[0].size = sizeof(*arg);
780 req->in.args[0].value = arg;
781 req->out.numargs = 1;
782 /* Variable length arguement used for backward compatibility
783 with interface version < 7.5. Rest of init_out is zeroed
784 by do_get_request(), so a short reply is not a problem */
785 req->out.argvar = 1;
786 req->out.args[0].size = sizeof(struct fuse_init_out);
787 req->out.args[0].value = &req->misc.init_out;
788 req->end = process_init_reply;
Tejun Heob93f8582008-11-26 12:03:55 +0100789 fuse_request_send_background(fc, req);
Miklos Szeredi9b9a0462006-01-16 22:14:44 -0800790}
791
Tejun Heo43901aa2008-11-26 12:03:56 +0100792static void fuse_free_conn(struct fuse_conn *fc)
793{
794 kfree(fc);
795}
796
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700797static int fuse_fill_super(struct super_block *sb, void *data, int silent)
798{
799 struct fuse_conn *fc;
800 struct inode *root;
801 struct fuse_mount_data d;
802 struct file *file;
Miklos Szeredif543f252006-01-16 22:14:35 -0800803 struct dentry *root_dentry;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700804 struct fuse_req *init_req;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700805 int err;
Miklos Szeredid8091612006-12-06 20:35:48 -0800806 int is_bdev = sb->s_bdev != NULL;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700807
Miklos Szeredi71421252006-06-25 05:48:52 -0700808 if (sb->s_flags & MS_MANDLOCK)
809 return -EINVAL;
810
Miklos Szeredid8091612006-12-06 20:35:48 -0800811 if (!parse_fuse_opt((char *) data, &d, is_bdev))
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700812 return -EINVAL;
813
Miklos Szeredid8091612006-12-06 20:35:48 -0800814 if (is_bdev) {
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800815#ifdef CONFIG_BLOCK
Miklos Szeredid8091612006-12-06 20:35:48 -0800816 if (!sb_set_blocksize(sb, d.blksize))
817 return -EINVAL;
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800818#endif
Miklos Szeredid8091612006-12-06 20:35:48 -0800819 } else {
820 sb->s_blocksize = PAGE_CACHE_SIZE;
821 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
822 }
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700823 sb->s_magic = FUSE_SUPER_MAGIC;
824 sb->s_op = &fuse_super_operations;
825 sb->s_maxbytes = MAX_LFS_FILESIZE;
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700826 sb->s_export_op = &fuse_export_operations;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700827
828 file = fget(d.fd);
829 if (!file)
830 return -EINVAL;
831
Miklos Szeredi0720b312006-04-10 22:54:55 -0700832 if (file->f_op != &fuse_dev_operations)
833 return -EINVAL;
834
Tejun Heo0d179aa2008-11-26 12:03:55 +0100835 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
Miklos Szeredi0720b312006-04-10 22:54:55 -0700836 if (!fc)
837 return -ENOMEM;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700838
Tejun Heo0d179aa2008-11-26 12:03:55 +0100839 err = fuse_conn_init(fc, sb);
840 if (err) {
841 kfree(fc);
842 return err;
843 }
844
Tejun Heo43901aa2008-11-26 12:03:56 +0100845 fc->release = fuse_free_conn;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -0700846 fc->flags = d.flags;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700847 fc->user_id = d.user_id;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700848 fc->group_id = d.group_id;
Miklos Szeredif948d562008-06-17 18:05:40 +0200849 fc->max_read = max_t(unsigned, 4096, d.max_read);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700850
Miklos Szeredif543f252006-01-16 22:14:35 -0800851 /* Used by get_root_inode() */
852 sb->s_fs_info = fc;
853
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700854 err = -ENOMEM;
Tejun Heob93f8582008-11-26 12:03:55 +0100855 root = fuse_get_root_inode(sb, d.rootmode);
Miklos Szeredif543f252006-01-16 22:14:35 -0800856 if (!root)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700857 goto err;
858
Miklos Szeredif543f252006-01-16 22:14:35 -0800859 root_dentry = d_alloc_root(root);
860 if (!root_dentry) {
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700861 iput(root);
862 goto err;
863 }
Miklos Szeredif543f252006-01-16 22:14:35 -0800864
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700865 init_req = fuse_request_alloc();
866 if (!init_req)
867 goto err_put_root;
868
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800869 if (is_bdev) {
870 fc->destroy_req = fuse_request_alloc();
871 if (!fc->destroy_req)
Julia Lawall17e18ab2008-10-16 16:08:56 +0200872 goto err_free_init_req;
Miklos Szeredi0ec7ca42006-12-06 20:35:52 -0800873 }
874
Miklos Szeredibafa9652006-06-25 05:48:51 -0700875 mutex_lock(&fuse_mutex);
Miklos Szeredi8aa09a52006-04-26 10:49:16 +0200876 err = -EINVAL;
877 if (file->private_data)
Miklos Szeredibafa9652006-06-25 05:48:51 -0700878 goto err_unlock;
Miklos Szeredi8aa09a52006-04-26 10:49:16 +0200879
Miklos Szeredibafa9652006-06-25 05:48:51 -0700880 err = fuse_ctl_add_conn(fc);
881 if (err)
882 goto err_unlock;
883
884 list_add_tail(&fc->entry, &fuse_conn_list);
Miklos Szeredif543f252006-01-16 22:14:35 -0800885 sb->s_root = root_dentry;
Miklos Szeredif543f252006-01-16 22:14:35 -0800886 fc->connected = 1;
Miklos Szeredibafa9652006-06-25 05:48:51 -0700887 file->private_data = fuse_conn_get(fc);
888 mutex_unlock(&fuse_mutex);
Miklos Szeredi0720b312006-04-10 22:54:55 -0700889 /*
890 * atomic_dec_and_test() in fput() provides the necessary
891 * memory barrier for file->private_data to be visible on all
892 * CPUs after this
893 */
894 fput(file);
Miklos Szeredif543f252006-01-16 22:14:35 -0800895
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700896 fuse_send_init(fc, init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -0800897
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700898 return 0;
899
Miklos Szeredibafa9652006-06-25 05:48:51 -0700900 err_unlock:
901 mutex_unlock(&fuse_mutex);
Julia Lawall17e18ab2008-10-16 16:08:56 +0200902 err_free_init_req:
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700903 fuse_request_free(init_req);
Miklos Szeredif543f252006-01-16 22:14:35 -0800904 err_put_root:
905 dput(root_dentry);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700906 err:
Miklos Szeredi0720b312006-04-10 22:54:55 -0700907 fput(file);
Miklos Szeredibafa9652006-06-25 05:48:51 -0700908 fuse_conn_put(fc);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700909 return err;
910}
911
David Howells454e2392006-06-23 02:02:57 -0700912static int fuse_get_sb(struct file_system_type *fs_type,
913 int flags, const char *dev_name,
914 void *raw_data, struct vfsmount *mnt)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700915{
David Howells454e2392006-06-23 02:02:57 -0700916 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700917}
918
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800919static struct file_system_type fuse_fs_type = {
920 .owner = THIS_MODULE,
921 .name = "fuse",
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -0700922 .fs_flags = FS_HAS_SUBTYPE,
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800923 .get_sb = fuse_get_sb,
924 .kill_sb = kill_anon_super,
925};
926
927#ifdef CONFIG_BLOCK
Miklos Szeredid6392f82006-12-06 20:35:44 -0800928static int fuse_get_sb_blk(struct file_system_type *fs_type,
929 int flags, const char *dev_name,
930 void *raw_data, struct vfsmount *mnt)
931{
932 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
933 mnt);
934}
935
Miklos Szeredid6392f82006-12-06 20:35:44 -0800936static struct file_system_type fuseblk_fs_type = {
937 .owner = THIS_MODULE,
938 .name = "fuseblk",
939 .get_sb = fuse_get_sb_blk,
940 .kill_sb = kill_block_super,
Alexey Dobriyanedad01e2007-06-16 10:16:05 -0700941 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
Miklos Szeredid6392f82006-12-06 20:35:44 -0800942};
943
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800944static inline int register_fuseblk(void)
945{
946 return register_filesystem(&fuseblk_fs_type);
947}
948
949static inline void unregister_fuseblk(void)
950{
951 unregister_filesystem(&fuseblk_fs_type);
952}
953#else
954static inline int register_fuseblk(void)
955{
956 return 0;
957}
958
959static inline void unregister_fuseblk(void)
960{
961}
962#endif
963
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700964static void fuse_inode_init_once(void *foo)
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700965{
Miklos Szeredi1729a162008-11-26 12:03:54 +0100966 struct inode *inode = foo;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700967
Christoph Lametera35afb82007-05-16 22:10:57 -0700968 inode_init_once(inode);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700969}
970
971static int __init fuse_fs_init(void)
972{
973 int err;
974
975 err = register_filesystem(&fuse_fs_type);
976 if (err)
Miklos Szeredid6392f82006-12-06 20:35:44 -0800977 goto out;
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700978
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800979 err = register_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -0800980 if (err)
981 goto out_unreg;
982
983 fuse_inode_cachep = kmem_cache_create("fuse_inode",
984 sizeof(struct fuse_inode),
985 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +0900986 fuse_inode_init_once);
Miklos Szeredid6392f82006-12-06 20:35:44 -0800987 err = -ENOMEM;
988 if (!fuse_inode_cachep)
989 goto out_unreg2;
990
991 return 0;
992
993 out_unreg2:
Miklos Szeredi875d95e2006-12-06 20:35:54 -0800994 unregister_fuseblk();
Miklos Szeredid6392f82006-12-06 20:35:44 -0800995 out_unreg:
996 unregister_filesystem(&fuse_fs_type);
997 out:
Miklos Szeredid8a5ba42005-09-09 13:10:26 -0700998 return err;
999}
1000
1001static void fuse_fs_cleanup(void)
1002{
1003 unregister_filesystem(&fuse_fs_type);
Miklos Szeredi875d95e2006-12-06 20:35:54 -08001004 unregister_fuseblk();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001005 kmem_cache_destroy(fuse_inode_cachep);
1006}
1007
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001008static struct kobject *fuse_kobj;
1009static struct kobject *connections_kobj;
1010
Miklos Szeredif543f252006-01-16 22:14:35 -08001011static int fuse_sysfs_init(void)
1012{
1013 int err;
1014
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001015 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001016 if (!fuse_kobj) {
1017 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001018 goto out_err;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001019 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001020
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001021 connections_kobj = kobject_create_and_add("connections", fuse_kobj);
1022 if (!connections_kobj) {
1023 err = -ENOMEM;
Miklos Szeredif543f252006-01-16 22:14:35 -08001024 goto out_fuse_unregister;
Greg Kroah-Hartman5c89e172007-10-29 20:13:17 +01001025 }
Miklos Szeredif543f252006-01-16 22:14:35 -08001026
1027 return 0;
1028
1029 out_fuse_unregister:
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001030 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001031 out_err:
1032 return err;
1033}
1034
1035static void fuse_sysfs_cleanup(void)
1036{
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -08001037 kobject_put(connections_kobj);
1038 kobject_put(fuse_kobj);
Miklos Szeredif543f252006-01-16 22:14:35 -08001039}
1040
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001041static int __init fuse_init(void)
1042{
1043 int res;
1044
Miklos Szeredi1729a162008-11-26 12:03:54 +01001045 printk(KERN_INFO "fuse init (API version %i.%i)\n",
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001046 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1047
Miklos Szeredibafa9652006-06-25 05:48:51 -07001048 INIT_LIST_HEAD(&fuse_conn_list);
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001049 res = fuse_fs_init();
1050 if (res)
1051 goto err;
1052
Miklos Szeredi334f4852005-09-09 13:10:27 -07001053 res = fuse_dev_init();
1054 if (res)
1055 goto err_fs_cleanup;
1056
Miklos Szeredif543f252006-01-16 22:14:35 -08001057 res = fuse_sysfs_init();
1058 if (res)
1059 goto err_dev_cleanup;
1060
Miklos Szeredibafa9652006-06-25 05:48:51 -07001061 res = fuse_ctl_init();
1062 if (res)
1063 goto err_sysfs_cleanup;
1064
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001065 return 0;
1066
Miklos Szeredibafa9652006-06-25 05:48:51 -07001067 err_sysfs_cleanup:
1068 fuse_sysfs_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001069 err_dev_cleanup:
1070 fuse_dev_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001071 err_fs_cleanup:
1072 fuse_fs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001073 err:
1074 return res;
1075}
1076
1077static void __exit fuse_exit(void)
1078{
1079 printk(KERN_DEBUG "fuse exit\n");
1080
Miklos Szeredibafa9652006-06-25 05:48:51 -07001081 fuse_ctl_cleanup();
Miklos Szeredif543f252006-01-16 22:14:35 -08001082 fuse_sysfs_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001083 fuse_fs_cleanup();
Miklos Szeredi334f4852005-09-09 13:10:27 -07001084 fuse_dev_cleanup();
Miklos Szeredid8a5ba42005-09-09 13:10:26 -07001085}
1086
1087module_init(fuse_init);
1088module_exit(fuse_exit);