Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | FUSE: Filesystem in Userspace |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 4 | |
| 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 Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 14 | #include <linux/seq_file.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/module.h> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 17 | #include <linux/parser.h> |
| 18 | #include <linux/statfs.h> |
Miklos Szeredi | 9c8ef56 | 2006-06-25 05:48:55 -0700 | [diff] [blame] | 19 | #include <linux/random.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 20 | #include <linux/sched.h> |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 21 | |
| 22 | MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); |
| 23 | MODULE_DESCRIPTION("Filesystem in Userspace"); |
| 24 | MODULE_LICENSE("GPL"); |
| 25 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 26 | static struct kmem_cache *fuse_inode_cachep; |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 27 | struct list_head fuse_conn_list; |
| 28 | DEFINE_MUTEX(fuse_mutex); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 29 | |
| 30 | #define FUSE_SUPER_MAGIC 0x65735546 |
| 31 | |
| 32 | struct fuse_mount_data { |
| 33 | int fd; |
| 34 | unsigned rootmode; |
| 35 | unsigned user_id; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 36 | unsigned group_id; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 37 | unsigned fd_present : 1; |
| 38 | unsigned rootmode_present : 1; |
| 39 | unsigned user_id_present : 1; |
| 40 | unsigned group_id_present : 1; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 41 | unsigned flags; |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 42 | unsigned max_read; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 43 | unsigned blksize; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | static struct inode *fuse_alloc_inode(struct super_block *sb) |
| 47 | { |
| 48 | struct inode *inode; |
| 49 | struct fuse_inode *fi; |
| 50 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 51 | inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 52 | if (!inode) |
| 53 | return NULL; |
| 54 | |
| 55 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 0a0898c | 2006-07-30 03:04:10 -0700 | [diff] [blame] | 56 | fi->i_time = 0; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 57 | fi->nodeid = 0; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 58 | fi->nlookup = 0; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 59 | fi->forget_req = fuse_request_alloc(); |
| 60 | if (!fi->forget_req) { |
| 61 | kmem_cache_free(fuse_inode_cachep, inode); |
| 62 | return NULL; |
| 63 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 64 | |
| 65 | return inode; |
| 66 | } |
| 67 | |
| 68 | static void fuse_destroy_inode(struct inode *inode) |
| 69 | { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 70 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 71 | if (fi->forget_req) |
| 72 | fuse_request_free(fi->forget_req); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 73 | kmem_cache_free(fuse_inode_cachep, inode); |
| 74 | } |
| 75 | |
| 76 | static void fuse_read_inode(struct inode *inode) |
| 77 | { |
| 78 | /* No op */ |
| 79 | } |
| 80 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 81 | void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 82 | unsigned long nodeid, u64 nlookup) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 83 | { |
| 84 | struct fuse_forget_in *inarg = &req->misc.forget_in; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 85 | inarg->nlookup = nlookup; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 86 | req->in.h.opcode = FUSE_FORGET; |
| 87 | req->in.h.nodeid = nodeid; |
| 88 | req->in.numargs = 1; |
| 89 | req->in.args[0].size = sizeof(struct fuse_forget_in); |
| 90 | req->in.args[0].value = inarg; |
| 91 | request_send_noreply(fc, req); |
| 92 | } |
| 93 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 94 | static void fuse_clear_inode(struct inode *inode) |
| 95 | { |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 96 | if (inode->i_sb->s_flags & MS_ACTIVE) { |
| 97 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 98 | struct fuse_inode *fi = get_fuse_inode(inode); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 99 | fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 100 | fi->forget_req = NULL; |
| 101 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 102 | } |
| 103 | |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 104 | static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) |
| 105 | { |
| 106 | if (*flags & MS_MANDLOCK) |
| 107 | return -EINVAL; |
| 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 112 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) |
| 113 | { |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 114 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 115 | if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 116 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 117 | |
| 118 | inode->i_ino = attr->ino; |
| 119 | inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); |
| 120 | inode->i_nlink = attr->nlink; |
| 121 | inode->i_uid = attr->uid; |
| 122 | inode->i_gid = attr->gid; |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 123 | spin_lock(&fc->lock); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 124 | i_size_write(inode, attr->size); |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 125 | spin_unlock(&fc->lock); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 126 | inode->i_blocks = attr->blocks; |
| 127 | inode->i_atime.tv_sec = attr->atime; |
| 128 | inode->i_atime.tv_nsec = attr->atimensec; |
| 129 | inode->i_mtime.tv_sec = attr->mtime; |
| 130 | inode->i_mtime.tv_nsec = attr->mtimensec; |
| 131 | inode->i_ctime.tv_sec = attr->ctime; |
| 132 | inode->i_ctime.tv_nsec = attr->ctimensec; |
| 133 | } |
| 134 | |
| 135 | static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) |
| 136 | { |
| 137 | inode->i_mode = attr->mode & S_IFMT; |
Miklos Szeredi | 9ffbb91 | 2006-10-17 00:10:06 -0700 | [diff] [blame] | 138 | inode->i_size = attr->size; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 139 | if (S_ISREG(inode->i_mode)) { |
| 140 | fuse_init_common(inode); |
Miklos Szeredi | b6aeade | 2005-09-09 13:10:30 -0700 | [diff] [blame] | 141 | fuse_init_file_inode(inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 142 | } else if (S_ISDIR(inode->i_mode)) |
| 143 | fuse_init_dir(inode); |
| 144 | else if (S_ISLNK(inode->i_mode)) |
| 145 | fuse_init_symlink(inode); |
| 146 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
| 147 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { |
| 148 | fuse_init_common(inode); |
| 149 | init_special_inode(inode, inode->i_mode, |
| 150 | new_decode_dev(attr->rdev)); |
Miklos Szeredi | 39ee059 | 2006-01-06 00:19:43 -0800 | [diff] [blame] | 151 | } else |
| 152 | BUG(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | static int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
| 156 | { |
| 157 | unsigned long nodeid = *(unsigned long *) _nodeidp; |
| 158 | if (get_node_id(inode) == nodeid) |
| 159 | return 1; |
| 160 | else |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int fuse_inode_set(struct inode *inode, void *_nodeidp) |
| 165 | { |
| 166 | unsigned long nodeid = *(unsigned long *) _nodeidp; |
| 167 | get_fuse_inode(inode)->nodeid = nodeid; |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 172 | int generation, struct fuse_attr *attr) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 173 | { |
| 174 | struct inode *inode; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 175 | struct fuse_inode *fi; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 176 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 177 | |
| 178 | retry: |
| 179 | inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); |
| 180 | if (!inode) |
| 181 | return NULL; |
| 182 | |
| 183 | if ((inode->i_state & I_NEW)) { |
Miklos Szeredi | b36c31b | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 184 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 185 | inode->i_generation = generation; |
| 186 | inode->i_data.backing_dev_info = &fc->bdi; |
| 187 | fuse_init_inode(inode, attr); |
| 188 | unlock_new_inode(inode); |
| 189 | } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 190 | /* Inode has changed type, any I/O on the old should fail */ |
| 191 | make_bad_inode(inode); |
| 192 | iput(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 193 | goto retry; |
| 194 | } |
| 195 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 196 | fi = get_fuse_inode(inode); |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 197 | spin_lock(&fc->lock); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 198 | fi->nlookup ++; |
Miklos Szeredi | 8da5ff2 | 2006-10-17 00:10:08 -0700 | [diff] [blame] | 199 | spin_unlock(&fc->lock); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 200 | fuse_change_attributes(inode, attr); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 201 | return inode; |
| 202 | } |
| 203 | |
Trond Myklebust | 8b512d9 | 2006-06-09 09:34:18 -0400 | [diff] [blame] | 204 | static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 205 | { |
Trond Myklebust | 8b512d9 | 2006-06-09 09:34:18 -0400 | [diff] [blame] | 206 | if (flags & MNT_FORCE) |
| 207 | fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 208 | } |
| 209 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 210 | static void fuse_send_destroy(struct fuse_conn *fc) |
| 211 | { |
| 212 | struct fuse_req *req = fc->destroy_req; |
| 213 | if (req && fc->conn_init) { |
| 214 | fc->destroy_req = NULL; |
| 215 | req->in.h.opcode = FUSE_DESTROY; |
| 216 | req->force = 1; |
| 217 | request_send(fc, req); |
| 218 | fuse_put_request(fc, req); |
| 219 | } |
| 220 | } |
| 221 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 222 | static void fuse_put_super(struct super_block *sb) |
| 223 | { |
| 224 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
| 225 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 226 | fuse_send_destroy(fc); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 227 | spin_lock(&fc->lock); |
Miklos Szeredi | 9ba7cbb | 2006-01-16 22:14:34 -0800 | [diff] [blame] | 228 | fc->connected = 0; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 229 | fc->blocked = 0; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 230 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 231 | /* Flush all readers on this fs */ |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 232 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 233 | wake_up_all(&fc->waitq); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 234 | wake_up_all(&fc->blocked_waitq); |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame^] | 235 | wake_up_all(&fc->reserved_req_waitq); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 236 | mutex_lock(&fuse_mutex); |
| 237 | list_del(&fc->entry); |
| 238 | fuse_ctl_remove_conn(fc); |
| 239 | mutex_unlock(&fuse_mutex); |
| 240 | fuse_conn_put(fc); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 241 | } |
| 242 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 243 | static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
| 244 | { |
| 245 | stbuf->f_type = FUSE_SUPER_MAGIC; |
| 246 | stbuf->f_bsize = attr->bsize; |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 247 | stbuf->f_frsize = attr->frsize; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 248 | stbuf->f_blocks = attr->blocks; |
| 249 | stbuf->f_bfree = attr->bfree; |
| 250 | stbuf->f_bavail = attr->bavail; |
| 251 | stbuf->f_files = attr->files; |
| 252 | stbuf->f_ffree = attr->ffree; |
| 253 | stbuf->f_namelen = attr->namelen; |
| 254 | /* fsid is left zero */ |
| 255 | } |
| 256 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 257 | static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 258 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 259 | struct super_block *sb = dentry->d_sb; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 260 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
| 261 | struct fuse_req *req; |
| 262 | struct fuse_statfs_out outarg; |
| 263 | int err; |
| 264 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 265 | req = fuse_get_req(fc); |
| 266 | if (IS_ERR(req)) |
| 267 | return PTR_ERR(req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 268 | |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 269 | memset(&outarg, 0, sizeof(outarg)); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 270 | req->in.numargs = 0; |
| 271 | req->in.h.opcode = FUSE_STATFS; |
Miklos Szeredi | 5b35e8e | 2006-09-29 01:59:34 -0700 | [diff] [blame] | 272 | req->in.h.nodeid = get_node_id(dentry->d_inode); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 273 | req->out.numargs = 1; |
Miklos Szeredi | de5f120 | 2006-01-06 00:19:37 -0800 | [diff] [blame] | 274 | req->out.args[0].size = |
| 275 | fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 276 | req->out.args[0].value = &outarg; |
| 277 | request_send(fc, req); |
| 278 | err = req->out.h.error; |
| 279 | if (!err) |
| 280 | convert_fuse_statfs(buf, &outarg.st); |
| 281 | fuse_put_request(fc, req); |
| 282 | return err; |
| 283 | } |
| 284 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 285 | enum { |
| 286 | OPT_FD, |
| 287 | OPT_ROOTMODE, |
| 288 | OPT_USER_ID, |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 289 | OPT_GROUP_ID, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 290 | OPT_DEFAULT_PERMISSIONS, |
| 291 | OPT_ALLOW_OTHER, |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 292 | OPT_MAX_READ, |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 293 | OPT_BLKSIZE, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 294 | OPT_ERR |
| 295 | }; |
| 296 | |
| 297 | static match_table_t tokens = { |
| 298 | {OPT_FD, "fd=%u"}, |
| 299 | {OPT_ROOTMODE, "rootmode=%o"}, |
| 300 | {OPT_USER_ID, "user_id=%u"}, |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 301 | {OPT_GROUP_ID, "group_id=%u"}, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 302 | {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
| 303 | {OPT_ALLOW_OTHER, "allow_other"}, |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 304 | {OPT_MAX_READ, "max_read=%u"}, |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 305 | {OPT_BLKSIZE, "blksize=%u"}, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 306 | {OPT_ERR, NULL} |
| 307 | }; |
| 308 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 309 | static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 310 | { |
| 311 | char *p; |
| 312 | memset(d, 0, sizeof(struct fuse_mount_data)); |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 313 | d->max_read = ~0; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 314 | d->blksize = 512; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 315 | |
| 316 | while ((p = strsep(&opt, ",")) != NULL) { |
| 317 | int token; |
| 318 | int value; |
| 319 | substring_t args[MAX_OPT_ARGS]; |
| 320 | if (!*p) |
| 321 | continue; |
| 322 | |
| 323 | token = match_token(p, tokens, args); |
| 324 | switch (token) { |
| 325 | case OPT_FD: |
| 326 | if (match_int(&args[0], &value)) |
| 327 | return 0; |
| 328 | d->fd = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 329 | d->fd_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 330 | break; |
| 331 | |
| 332 | case OPT_ROOTMODE: |
| 333 | if (match_octal(&args[0], &value)) |
| 334 | return 0; |
Timo Savola | a5bfffac | 2007-04-08 16:04:00 -0700 | [diff] [blame] | 335 | if (!fuse_valid_type(value)) |
| 336 | return 0; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 337 | d->rootmode = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 338 | d->rootmode_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 339 | break; |
| 340 | |
| 341 | case OPT_USER_ID: |
| 342 | if (match_int(&args[0], &value)) |
| 343 | return 0; |
| 344 | d->user_id = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 345 | d->user_id_present = 1; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 346 | break; |
| 347 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 348 | case OPT_GROUP_ID: |
| 349 | if (match_int(&args[0], &value)) |
| 350 | return 0; |
| 351 | d->group_id = value; |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 352 | d->group_id_present = 1; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 353 | break; |
| 354 | |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 355 | case OPT_DEFAULT_PERMISSIONS: |
| 356 | d->flags |= FUSE_DEFAULT_PERMISSIONS; |
| 357 | break; |
| 358 | |
| 359 | case OPT_ALLOW_OTHER: |
| 360 | d->flags |= FUSE_ALLOW_OTHER; |
| 361 | break; |
| 362 | |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 363 | case OPT_MAX_READ: |
| 364 | if (match_int(&args[0], &value)) |
| 365 | return 0; |
| 366 | d->max_read = value; |
| 367 | break; |
| 368 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 369 | case OPT_BLKSIZE: |
| 370 | if (!is_bdev || match_int(&args[0], &value)) |
| 371 | return 0; |
| 372 | d->blksize = value; |
| 373 | break; |
| 374 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 375 | default: |
| 376 | return 0; |
| 377 | } |
| 378 | } |
Miklos Szeredi | 5a53368 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 379 | |
| 380 | if (!d->fd_present || !d->rootmode_present || |
| 381 | !d->user_id_present || !d->group_id_present) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 382 | return 0; |
| 383 | |
| 384 | return 1; |
| 385 | } |
| 386 | |
| 387 | static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) |
| 388 | { |
| 389 | struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); |
| 390 | |
| 391 | seq_printf(m, ",user_id=%u", fc->user_id); |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 392 | seq_printf(m, ",group_id=%u", fc->group_id); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 393 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
| 394 | seq_puts(m, ",default_permissions"); |
| 395 | if (fc->flags & FUSE_ALLOW_OTHER) |
| 396 | seq_puts(m, ",allow_other"); |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 397 | if (fc->max_read != ~0) |
| 398 | seq_printf(m, ",max_read=%u", fc->max_read); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 399 | return 0; |
| 400 | } |
| 401 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 402 | static struct fuse_conn *new_conn(void) |
| 403 | { |
| 404 | struct fuse_conn *fc; |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 405 | int err; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 406 | |
Miklos Szeredi | 6383bda | 2006-01-16 22:14:29 -0800 | [diff] [blame] | 407 | fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 408 | if (fc) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 409 | spin_lock_init(&fc->lock); |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 410 | mutex_init(&fc->inst_mutex); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 411 | atomic_set(&fc->count, 1); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 412 | init_waitqueue_head(&fc->waitq); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 413 | init_waitqueue_head(&fc->blocked_waitq); |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame^] | 414 | init_waitqueue_head(&fc->reserved_req_waitq); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 415 | INIT_LIST_HEAD(&fc->pending); |
| 416 | INIT_LIST_HEAD(&fc->processing); |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 417 | INIT_LIST_HEAD(&fc->io); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 418 | INIT_LIST_HEAD(&fc->interrupts); |
Miklos Szeredi | 095da6c | 2006-01-16 22:14:52 -0800 | [diff] [blame] | 419 | atomic_set(&fc->num_waiting, 0); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 420 | fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
| 421 | fc->bdi.unplug_io_fn = default_unplug_io_fn; |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 422 | err = bdi_init(&fc->bdi); |
| 423 | if (err) { |
| 424 | kfree(fc); |
| 425 | fc = NULL; |
| 426 | goto out; |
| 427 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 428 | fc->reqctr = 0; |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 429 | fc->blocked = 1; |
Miklos Szeredi | 9c8ef56 | 2006-06-25 05:48:55 -0700 | [diff] [blame] | 430 | get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 431 | } |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 432 | out: |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 433 | return fc; |
| 434 | } |
| 435 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 436 | void fuse_conn_put(struct fuse_conn *fc) |
| 437 | { |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 438 | if (atomic_dec_and_test(&fc->count)) { |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 439 | if (fc->destroy_req) |
| 440 | fuse_request_free(fc->destroy_req); |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 441 | mutex_destroy(&fc->inst_mutex); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 442 | bdi_destroy(&fc->bdi); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 443 | kfree(fc); |
Miklos Szeredi | d2a8516 | 2006-10-17 00:10:11 -0700 | [diff] [blame] | 444 | } |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) |
| 448 | { |
| 449 | atomic_inc(&fc->count); |
| 450 | return fc; |
| 451 | } |
| 452 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 453 | static struct inode *get_root_inode(struct super_block *sb, unsigned mode) |
| 454 | { |
| 455 | struct fuse_attr attr; |
| 456 | memset(&attr, 0, sizeof(attr)); |
| 457 | |
| 458 | attr.mode = mode; |
| 459 | attr.ino = FUSE_ROOT_ID; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 460 | return fuse_iget(sb, 1, 0, &attr); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 461 | } |
| 462 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 463 | static const struct super_operations fuse_super_operations = { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 464 | .alloc_inode = fuse_alloc_inode, |
| 465 | .destroy_inode = fuse_destroy_inode, |
| 466 | .read_inode = fuse_read_inode, |
| 467 | .clear_inode = fuse_clear_inode, |
Miklos Szeredi | ead5f0b | 2007-05-23 13:57:54 -0700 | [diff] [blame] | 468 | .drop_inode = generic_delete_inode, |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 469 | .remount_fs = fuse_remount_fs, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 470 | .put_super = fuse_put_super, |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 471 | .umount_begin = fuse_umount_begin, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 472 | .statfs = fuse_statfs, |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 473 | .show_options = fuse_show_options, |
| 474 | }; |
| 475 | |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 476 | static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
| 477 | { |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 478 | struct fuse_init_out *arg = &req->misc.init_out; |
| 479 | |
| 480 | if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) |
| 481 | fc->conn_error = 1; |
| 482 | else { |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 483 | unsigned long ra_pages; |
| 484 | |
| 485 | if (arg->minor >= 6) { |
| 486 | ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; |
| 487 | if (arg->flags & FUSE_ASYNC_READ) |
| 488 | fc->async_read = 1; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 489 | if (!(arg->flags & FUSE_POSIX_LOCKS)) |
| 490 | fc->no_lock = 1; |
| 491 | } else { |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 492 | ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 493 | fc->no_lock = 1; |
| 494 | } |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 495 | |
| 496 | fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 497 | fc->minor = arg->minor; |
| 498 | fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 499 | fc->conn_init = 1; |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 500 | } |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 501 | fuse_put_request(fc, req); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 502 | fc->blocked = 0; |
| 503 | wake_up_all(&fc->blocked_waitq); |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 504 | } |
| 505 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 506 | static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 507 | { |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 508 | struct fuse_init_in *arg = &req->misc.init_in; |
Miklos Szeredi | 095da6c | 2006-01-16 22:14:52 -0800 | [diff] [blame] | 509 | |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 510 | arg->major = FUSE_KERNEL_VERSION; |
| 511 | arg->minor = FUSE_KERNEL_MINOR_VERSION; |
Miklos Szeredi | 9cd6845 | 2006-02-01 03:04:40 -0800 | [diff] [blame] | 512 | arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 513 | arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS; |
Miklos Szeredi | 9b9a046 | 2006-01-16 22:14:44 -0800 | [diff] [blame] | 514 | req->in.h.opcode = FUSE_INIT; |
| 515 | req->in.numargs = 1; |
| 516 | req->in.args[0].size = sizeof(*arg); |
| 517 | req->in.args[0].value = arg; |
| 518 | req->out.numargs = 1; |
| 519 | /* Variable length arguement used for backward compatibility |
| 520 | with interface version < 7.5. Rest of init_out is zeroed |
| 521 | by do_get_request(), so a short reply is not a problem */ |
| 522 | req->out.argvar = 1; |
| 523 | req->out.args[0].size = sizeof(struct fuse_init_out); |
| 524 | req->out.args[0].value = &req->misc.init_out; |
| 525 | req->end = process_init_reply; |
| 526 | request_send_background(fc, req); |
| 527 | } |
| 528 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 529 | static u64 conn_id(void) |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 530 | { |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 531 | static u64 ctr = 1; |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 532 | return ctr++; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 533 | } |
| 534 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 535 | static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
| 536 | { |
| 537 | struct fuse_conn *fc; |
| 538 | struct inode *root; |
| 539 | struct fuse_mount_data d; |
| 540 | struct file *file; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 541 | struct dentry *root_dentry; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 542 | struct fuse_req *init_req; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 543 | int err; |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 544 | int is_bdev = sb->s_bdev != NULL; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 545 | |
Miklos Szeredi | 7142125 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 546 | if (sb->s_flags & MS_MANDLOCK) |
| 547 | return -EINVAL; |
| 548 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 549 | if (!parse_fuse_opt((char *) data, &d, is_bdev)) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 550 | return -EINVAL; |
| 551 | |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 552 | if (is_bdev) { |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 553 | #ifdef CONFIG_BLOCK |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 554 | if (!sb_set_blocksize(sb, d.blksize)) |
| 555 | return -EINVAL; |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 556 | #endif |
Miklos Szeredi | d809161 | 2006-12-06 20:35:48 -0800 | [diff] [blame] | 557 | } else { |
| 558 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 559 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 560 | } |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 561 | sb->s_magic = FUSE_SUPER_MAGIC; |
| 562 | sb->s_op = &fuse_super_operations; |
| 563 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 564 | |
| 565 | file = fget(d.fd); |
| 566 | if (!file) |
| 567 | return -EINVAL; |
| 568 | |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 569 | if (file->f_op != &fuse_dev_operations) |
| 570 | return -EINVAL; |
| 571 | |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 572 | fc = new_conn(); |
| 573 | if (!fc) |
| 574 | return -ENOMEM; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 575 | |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 576 | fc->flags = d.flags; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 577 | fc->user_id = d.user_id; |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 578 | fc->group_id = d.group_id; |
Miklos Szeredi | db50b96 | 2005-09-09 13:10:33 -0700 | [diff] [blame] | 579 | fc->max_read = d.max_read; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 580 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 581 | /* Used by get_root_inode() */ |
| 582 | sb->s_fs_info = fc; |
| 583 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 584 | err = -ENOMEM; |
| 585 | root = get_root_inode(sb, d.rootmode); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 586 | if (!root) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 587 | goto err; |
| 588 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 589 | root_dentry = d_alloc_root(root); |
| 590 | if (!root_dentry) { |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 591 | iput(root); |
| 592 | goto err; |
| 593 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 594 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 595 | init_req = fuse_request_alloc(); |
| 596 | if (!init_req) |
| 597 | goto err_put_root; |
| 598 | |
Miklos Szeredi | 0ec7ca4 | 2006-12-06 20:35:52 -0800 | [diff] [blame] | 599 | if (is_bdev) { |
| 600 | fc->destroy_req = fuse_request_alloc(); |
| 601 | if (!fc->destroy_req) |
| 602 | goto err_put_root; |
| 603 | } |
| 604 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 605 | mutex_lock(&fuse_mutex); |
Miklos Szeredi | 8aa09a5 | 2006-04-26 10:49:16 +0200 | [diff] [blame] | 606 | err = -EINVAL; |
| 607 | if (file->private_data) |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 608 | goto err_unlock; |
Miklos Szeredi | 8aa09a5 | 2006-04-26 10:49:16 +0200 | [diff] [blame] | 609 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 610 | fc->id = conn_id(); |
| 611 | err = fuse_ctl_add_conn(fc); |
| 612 | if (err) |
| 613 | goto err_unlock; |
| 614 | |
| 615 | list_add_tail(&fc->entry, &fuse_conn_list); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 616 | sb->s_root = root_dentry; |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 617 | fc->connected = 1; |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 618 | file->private_data = fuse_conn_get(fc); |
| 619 | mutex_unlock(&fuse_mutex); |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 620 | /* |
| 621 | * atomic_dec_and_test() in fput() provides the necessary |
| 622 | * memory barrier for file->private_data to be visible on all |
| 623 | * CPUs after this |
| 624 | */ |
| 625 | fput(file); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 626 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 627 | fuse_send_init(fc, init_req); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 628 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 629 | return 0; |
| 630 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 631 | err_unlock: |
| 632 | mutex_unlock(&fuse_mutex); |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 633 | fuse_request_free(init_req); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 634 | err_put_root: |
| 635 | dput(root_dentry); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 636 | err: |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 637 | fput(file); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 638 | fuse_conn_put(fc); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 639 | return err; |
| 640 | } |
| 641 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 642 | static int fuse_get_sb(struct file_system_type *fs_type, |
| 643 | int flags, const char *dev_name, |
| 644 | void *raw_data, struct vfsmount *mnt) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 645 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 646 | return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 647 | } |
| 648 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 649 | static struct file_system_type fuse_fs_type = { |
| 650 | .owner = THIS_MODULE, |
| 651 | .name = "fuse", |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 652 | .fs_flags = FS_HAS_SUBTYPE, |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 653 | .get_sb = fuse_get_sb, |
| 654 | .kill_sb = kill_anon_super, |
| 655 | }; |
| 656 | |
| 657 | #ifdef CONFIG_BLOCK |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 658 | static int fuse_get_sb_blk(struct file_system_type *fs_type, |
| 659 | int flags, const char *dev_name, |
| 660 | void *raw_data, struct vfsmount *mnt) |
| 661 | { |
| 662 | return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, |
| 663 | mnt); |
| 664 | } |
| 665 | |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 666 | static struct file_system_type fuseblk_fs_type = { |
| 667 | .owner = THIS_MODULE, |
| 668 | .name = "fuseblk", |
| 669 | .get_sb = fuse_get_sb_blk, |
| 670 | .kill_sb = kill_block_super, |
Alexey Dobriyan | edad01e | 2007-06-16 10:16:05 -0700 | [diff] [blame] | 671 | .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 672 | }; |
| 673 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 674 | static inline int register_fuseblk(void) |
| 675 | { |
| 676 | return register_filesystem(&fuseblk_fs_type); |
| 677 | } |
| 678 | |
| 679 | static inline void unregister_fuseblk(void) |
| 680 | { |
| 681 | unregister_filesystem(&fuseblk_fs_type); |
| 682 | } |
| 683 | #else |
| 684 | static inline int register_fuseblk(void) |
| 685 | { |
| 686 | return 0; |
| 687 | } |
| 688 | |
| 689 | static inline void unregister_fuseblk(void) |
| 690 | { |
| 691 | } |
| 692 | #endif |
| 693 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 694 | static decl_subsys(fuse, NULL, NULL); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 695 | static decl_subsys(connections, NULL, NULL); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 696 | |
Christoph Lameter | 4ba9b9d | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 697 | static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo) |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 698 | { |
| 699 | struct inode * inode = foo; |
| 700 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 701 | inode_init_once(inode); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 702 | } |
| 703 | |
| 704 | static int __init fuse_fs_init(void) |
| 705 | { |
| 706 | int err; |
| 707 | |
| 708 | err = register_filesystem(&fuse_fs_type); |
| 709 | if (err) |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 710 | goto out; |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 711 | |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 712 | err = register_fuseblk(); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 713 | if (err) |
| 714 | goto out_unreg; |
| 715 | |
| 716 | fuse_inode_cachep = kmem_cache_create("fuse_inode", |
| 717 | sizeof(struct fuse_inode), |
| 718 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 719 | fuse_inode_init_once); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 720 | err = -ENOMEM; |
| 721 | if (!fuse_inode_cachep) |
| 722 | goto out_unreg2; |
| 723 | |
| 724 | return 0; |
| 725 | |
| 726 | out_unreg2: |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 727 | unregister_fuseblk(); |
Miklos Szeredi | d6392f8 | 2006-12-06 20:35:44 -0800 | [diff] [blame] | 728 | out_unreg: |
| 729 | unregister_filesystem(&fuse_fs_type); |
| 730 | out: |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 731 | return err; |
| 732 | } |
| 733 | |
| 734 | static void fuse_fs_cleanup(void) |
| 735 | { |
| 736 | unregister_filesystem(&fuse_fs_type); |
Miklos Szeredi | 875d95e | 2006-12-06 20:35:54 -0800 | [diff] [blame] | 737 | unregister_fuseblk(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 738 | kmem_cache_destroy(fuse_inode_cachep); |
| 739 | } |
| 740 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 741 | static int fuse_sysfs_init(void) |
| 742 | { |
| 743 | int err; |
| 744 | |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 745 | kobj_set_kset_s(&fuse_subsys, fs_subsys); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 746 | err = subsystem_register(&fuse_subsys); |
| 747 | if (err) |
| 748 | goto out_err; |
| 749 | |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 750 | kobj_set_kset_s(&connections_subsys, fuse_subsys); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 751 | err = subsystem_register(&connections_subsys); |
| 752 | if (err) |
| 753 | goto out_fuse_unregister; |
| 754 | |
| 755 | return 0; |
| 756 | |
| 757 | out_fuse_unregister: |
| 758 | subsystem_unregister(&fuse_subsys); |
| 759 | out_err: |
| 760 | return err; |
| 761 | } |
| 762 | |
| 763 | static void fuse_sysfs_cleanup(void) |
| 764 | { |
| 765 | subsystem_unregister(&connections_subsys); |
| 766 | subsystem_unregister(&fuse_subsys); |
| 767 | } |
| 768 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 769 | static int __init fuse_init(void) |
| 770 | { |
| 771 | int res; |
| 772 | |
| 773 | printk("fuse init (API version %i.%i)\n", |
| 774 | FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
| 775 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 776 | INIT_LIST_HEAD(&fuse_conn_list); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 777 | res = fuse_fs_init(); |
| 778 | if (res) |
| 779 | goto err; |
| 780 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 781 | res = fuse_dev_init(); |
| 782 | if (res) |
| 783 | goto err_fs_cleanup; |
| 784 | |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 785 | res = fuse_sysfs_init(); |
| 786 | if (res) |
| 787 | goto err_dev_cleanup; |
| 788 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 789 | res = fuse_ctl_init(); |
| 790 | if (res) |
| 791 | goto err_sysfs_cleanup; |
| 792 | |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 793 | return 0; |
| 794 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 795 | err_sysfs_cleanup: |
| 796 | fuse_sysfs_cleanup(); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 797 | err_dev_cleanup: |
| 798 | fuse_dev_cleanup(); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 799 | err_fs_cleanup: |
| 800 | fuse_fs_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 801 | err: |
| 802 | return res; |
| 803 | } |
| 804 | |
| 805 | static void __exit fuse_exit(void) |
| 806 | { |
| 807 | printk(KERN_DEBUG "fuse exit\n"); |
| 808 | |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 809 | fuse_ctl_cleanup(); |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 810 | fuse_sysfs_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 811 | fuse_fs_cleanup(); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 812 | fuse_dev_cleanup(); |
Miklos Szeredi | d8a5ba4 | 2005-09-09 13:10:26 -0700 | [diff] [blame] | 813 | } |
| 814 | |
| 815 | module_init(fuse_init); |
| 816 | module_exit(fuse_exit); |