Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | FUSE: Filesystem in Userspace |
| 3 | Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> |
| 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/file.h> |
| 13 | #include <linux/gfp.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/namei.h> |
| 16 | |
| 17 | static inline unsigned long time_to_jiffies(unsigned long sec, |
| 18 | unsigned long nsec) |
| 19 | { |
| 20 | struct timespec ts = {sec, nsec}; |
| 21 | return jiffies + timespec_to_jiffies(&ts); |
| 22 | } |
| 23 | |
| 24 | static void fuse_lookup_init(struct fuse_req *req, struct inode *dir, |
| 25 | struct dentry *entry, |
| 26 | struct fuse_entry_out *outarg) |
| 27 | { |
| 28 | req->in.h.opcode = FUSE_LOOKUP; |
| 29 | req->in.h.nodeid = get_node_id(dir); |
| 30 | req->inode = dir; |
| 31 | req->in.numargs = 1; |
| 32 | req->in.args[0].size = entry->d_name.len + 1; |
| 33 | req->in.args[0].value = entry->d_name.name; |
| 34 | req->out.numargs = 1; |
| 35 | req->out.args[0].size = sizeof(struct fuse_entry_out); |
| 36 | req->out.args[0].value = outarg; |
| 37 | } |
| 38 | |
| 39 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
| 40 | { |
| 41 | if (!entry->d_inode || is_bad_inode(entry->d_inode)) |
| 42 | return 0; |
| 43 | else if (time_after(jiffies, entry->d_time)) { |
| 44 | int err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 45 | struct fuse_entry_out outarg; |
| 46 | struct inode *inode = entry->d_inode; |
| 47 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 48 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 49 | struct fuse_req *req = fuse_get_request(fc); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 50 | if (!req) |
| 51 | return 0; |
| 52 | |
| 53 | fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg); |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 54 | request_send(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 55 | err = req->out.h.error; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 56 | if (!err) { |
| 57 | if (outarg.nodeid != get_node_id(inode)) { |
| 58 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
| 59 | return 0; |
| 60 | } |
| 61 | fi->nlookup ++; |
| 62 | } |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 63 | fuse_put_request(fc, req); |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 64 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 65 | return 0; |
| 66 | |
| 67 | fuse_change_attributes(inode, &outarg.attr); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 68 | entry->d_time = time_to_jiffies(outarg.entry_valid, |
| 69 | outarg.entry_valid_nsec); |
| 70 | fi->i_time = time_to_jiffies(outarg.attr_valid, |
| 71 | outarg.attr_valid_nsec); |
| 72 | } |
| 73 | return 1; |
| 74 | } |
| 75 | |
| 76 | static struct dentry_operations fuse_dentry_operations = { |
| 77 | .d_revalidate = fuse_dentry_revalidate, |
| 78 | }; |
| 79 | |
| 80 | static int fuse_lookup_iget(struct inode *dir, struct dentry *entry, |
| 81 | struct inode **inodep) |
| 82 | { |
| 83 | int err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 84 | struct fuse_entry_out outarg; |
| 85 | struct inode *inode = NULL; |
| 86 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 87 | struct fuse_req *req; |
| 88 | |
| 89 | if (entry->d_name.len > FUSE_NAME_MAX) |
| 90 | return -ENAMETOOLONG; |
| 91 | |
| 92 | req = fuse_get_request(fc); |
| 93 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 94 | return -EINTR; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 95 | |
| 96 | fuse_lookup_init(req, dir, entry, &outarg); |
| 97 | request_send(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 98 | err = req->out.h.error; |
Miklos Szeredi | ee4e527 | 2005-09-27 21:45:21 -0700 | [diff] [blame] | 99 | if (!err && (!outarg.nodeid || outarg.nodeid == FUSE_ROOT_ID)) |
| 100 | err = -EIO; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 101 | if (!err) { |
| 102 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 103 | &outarg.attr); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 104 | if (!inode) { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 105 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 106 | return -ENOMEM; |
| 107 | } |
| 108 | } |
| 109 | fuse_put_request(fc, req); |
| 110 | if (err && err != -ENOENT) |
| 111 | return err; |
| 112 | |
| 113 | if (inode) { |
| 114 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 115 | entry->d_time = time_to_jiffies(outarg.entry_valid, |
| 116 | outarg.entry_valid_nsec); |
| 117 | fi->i_time = time_to_jiffies(outarg.attr_valid, |
| 118 | outarg.attr_valid_nsec); |
| 119 | } |
| 120 | |
| 121 | entry->d_op = &fuse_dentry_operations; |
| 122 | *inodep = inode; |
| 123 | return 0; |
| 124 | } |
| 125 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 126 | void fuse_invalidate_attr(struct inode *inode) |
| 127 | { |
| 128 | get_fuse_inode(inode)->i_time = jiffies - 1; |
| 129 | } |
| 130 | |
| 131 | static void fuse_invalidate_entry(struct dentry *entry) |
| 132 | { |
| 133 | d_invalidate(entry); |
| 134 | entry->d_time = jiffies - 1; |
| 135 | } |
| 136 | |
| 137 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
| 138 | struct inode *dir, struct dentry *entry, |
| 139 | int mode) |
| 140 | { |
| 141 | struct fuse_entry_out outarg; |
| 142 | struct inode *inode; |
| 143 | struct fuse_inode *fi; |
| 144 | int err; |
| 145 | |
| 146 | req->in.h.nodeid = get_node_id(dir); |
| 147 | req->inode = dir; |
| 148 | req->out.numargs = 1; |
| 149 | req->out.args[0].size = sizeof(outarg); |
| 150 | req->out.args[0].value = &outarg; |
| 151 | request_send(fc, req); |
| 152 | err = req->out.h.error; |
| 153 | if (err) { |
| 154 | fuse_put_request(fc, req); |
| 155 | return err; |
| 156 | } |
Miklos Szeredi | ee4e527 | 2005-09-27 21:45:21 -0700 | [diff] [blame] | 157 | if (!outarg.nodeid || outarg.nodeid == FUSE_ROOT_ID) { |
| 158 | fuse_put_request(fc, req); |
| 159 | return -EIO; |
| 160 | } |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 161 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
| 162 | &outarg.attr); |
| 163 | if (!inode) { |
| 164 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
| 165 | return -ENOMEM; |
| 166 | } |
| 167 | fuse_put_request(fc, req); |
| 168 | |
| 169 | /* Don't allow userspace to do really stupid things... */ |
| 170 | if ((inode->i_mode ^ mode) & S_IFMT) { |
| 171 | iput(inode); |
| 172 | return -EIO; |
| 173 | } |
| 174 | |
| 175 | entry->d_time = time_to_jiffies(outarg.entry_valid, |
| 176 | outarg.entry_valid_nsec); |
| 177 | |
| 178 | fi = get_fuse_inode(inode); |
| 179 | fi->i_time = time_to_jiffies(outarg.attr_valid, |
| 180 | outarg.attr_valid_nsec); |
| 181 | |
| 182 | d_instantiate(entry, inode); |
| 183 | fuse_invalidate_attr(dir); |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, |
| 188 | dev_t rdev) |
| 189 | { |
| 190 | struct fuse_mknod_in inarg; |
| 191 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 192 | struct fuse_req *req = fuse_get_request(fc); |
| 193 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 194 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 195 | |
| 196 | memset(&inarg, 0, sizeof(inarg)); |
| 197 | inarg.mode = mode; |
| 198 | inarg.rdev = new_encode_dev(rdev); |
| 199 | req->in.h.opcode = FUSE_MKNOD; |
| 200 | req->in.numargs = 2; |
| 201 | req->in.args[0].size = sizeof(inarg); |
| 202 | req->in.args[0].value = &inarg; |
| 203 | req->in.args[1].size = entry->d_name.len + 1; |
| 204 | req->in.args[1].value = entry->d_name.name; |
| 205 | return create_new_entry(fc, req, dir, entry, mode); |
| 206 | } |
| 207 | |
| 208 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, |
| 209 | struct nameidata *nd) |
| 210 | { |
| 211 | return fuse_mknod(dir, entry, mode, 0); |
| 212 | } |
| 213 | |
| 214 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) |
| 215 | { |
| 216 | struct fuse_mkdir_in inarg; |
| 217 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 218 | struct fuse_req *req = fuse_get_request(fc); |
| 219 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 220 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 221 | |
| 222 | memset(&inarg, 0, sizeof(inarg)); |
| 223 | inarg.mode = mode; |
| 224 | req->in.h.opcode = FUSE_MKDIR; |
| 225 | req->in.numargs = 2; |
| 226 | req->in.args[0].size = sizeof(inarg); |
| 227 | req->in.args[0].value = &inarg; |
| 228 | req->in.args[1].size = entry->d_name.len + 1; |
| 229 | req->in.args[1].value = entry->d_name.name; |
| 230 | return create_new_entry(fc, req, dir, entry, S_IFDIR); |
| 231 | } |
| 232 | |
| 233 | static int fuse_symlink(struct inode *dir, struct dentry *entry, |
| 234 | const char *link) |
| 235 | { |
| 236 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 237 | unsigned len = strlen(link) + 1; |
| 238 | struct fuse_req *req; |
| 239 | |
| 240 | if (len > FUSE_SYMLINK_MAX) |
| 241 | return -ENAMETOOLONG; |
| 242 | |
| 243 | req = fuse_get_request(fc); |
| 244 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 245 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 246 | |
| 247 | req->in.h.opcode = FUSE_SYMLINK; |
| 248 | req->in.numargs = 2; |
| 249 | req->in.args[0].size = entry->d_name.len + 1; |
| 250 | req->in.args[0].value = entry->d_name.name; |
| 251 | req->in.args[1].size = len; |
| 252 | req->in.args[1].value = link; |
| 253 | return create_new_entry(fc, req, dir, entry, S_IFLNK); |
| 254 | } |
| 255 | |
| 256 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
| 257 | { |
| 258 | int err; |
| 259 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 260 | struct fuse_req *req = fuse_get_request(fc); |
| 261 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 262 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 263 | |
| 264 | req->in.h.opcode = FUSE_UNLINK; |
| 265 | req->in.h.nodeid = get_node_id(dir); |
| 266 | req->inode = dir; |
| 267 | req->in.numargs = 1; |
| 268 | req->in.args[0].size = entry->d_name.len + 1; |
| 269 | req->in.args[0].value = entry->d_name.name; |
| 270 | request_send(fc, req); |
| 271 | err = req->out.h.error; |
| 272 | fuse_put_request(fc, req); |
| 273 | if (!err) { |
| 274 | struct inode *inode = entry->d_inode; |
| 275 | |
| 276 | /* Set nlink to zero so the inode can be cleared, if |
| 277 | the inode does have more links this will be |
| 278 | discovered at the next lookup/getattr */ |
| 279 | inode->i_nlink = 0; |
| 280 | fuse_invalidate_attr(inode); |
| 281 | fuse_invalidate_attr(dir); |
| 282 | } else if (err == -EINTR) |
| 283 | fuse_invalidate_entry(entry); |
| 284 | return err; |
| 285 | } |
| 286 | |
| 287 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) |
| 288 | { |
| 289 | int err; |
| 290 | struct fuse_conn *fc = get_fuse_conn(dir); |
| 291 | struct fuse_req *req = fuse_get_request(fc); |
| 292 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 293 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 294 | |
| 295 | req->in.h.opcode = FUSE_RMDIR; |
| 296 | req->in.h.nodeid = get_node_id(dir); |
| 297 | req->inode = dir; |
| 298 | req->in.numargs = 1; |
| 299 | req->in.args[0].size = entry->d_name.len + 1; |
| 300 | req->in.args[0].value = entry->d_name.name; |
| 301 | request_send(fc, req); |
| 302 | err = req->out.h.error; |
| 303 | fuse_put_request(fc, req); |
| 304 | if (!err) { |
| 305 | entry->d_inode->i_nlink = 0; |
| 306 | fuse_invalidate_attr(dir); |
| 307 | } else if (err == -EINTR) |
| 308 | fuse_invalidate_entry(entry); |
| 309 | return err; |
| 310 | } |
| 311 | |
| 312 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, |
| 313 | struct inode *newdir, struct dentry *newent) |
| 314 | { |
| 315 | int err; |
| 316 | struct fuse_rename_in inarg; |
| 317 | struct fuse_conn *fc = get_fuse_conn(olddir); |
| 318 | struct fuse_req *req = fuse_get_request(fc); |
| 319 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 320 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 321 | |
| 322 | memset(&inarg, 0, sizeof(inarg)); |
| 323 | inarg.newdir = get_node_id(newdir); |
| 324 | req->in.h.opcode = FUSE_RENAME; |
| 325 | req->in.h.nodeid = get_node_id(olddir); |
| 326 | req->inode = olddir; |
| 327 | req->inode2 = newdir; |
| 328 | req->in.numargs = 3; |
| 329 | req->in.args[0].size = sizeof(inarg); |
| 330 | req->in.args[0].value = &inarg; |
| 331 | req->in.args[1].size = oldent->d_name.len + 1; |
| 332 | req->in.args[1].value = oldent->d_name.name; |
| 333 | req->in.args[2].size = newent->d_name.len + 1; |
| 334 | req->in.args[2].value = newent->d_name.name; |
| 335 | request_send(fc, req); |
| 336 | err = req->out.h.error; |
| 337 | fuse_put_request(fc, req); |
| 338 | if (!err) { |
| 339 | fuse_invalidate_attr(olddir); |
| 340 | if (olddir != newdir) |
| 341 | fuse_invalidate_attr(newdir); |
| 342 | } else if (err == -EINTR) { |
| 343 | /* If request was interrupted, DEITY only knows if the |
| 344 | rename actually took place. If the invalidation |
| 345 | fails (e.g. some process has CWD under the renamed |
| 346 | directory), then there can be inconsistency between |
| 347 | the dcache and the real filesystem. Tough luck. */ |
| 348 | fuse_invalidate_entry(oldent); |
| 349 | if (newent->d_inode) |
| 350 | fuse_invalidate_entry(newent); |
| 351 | } |
| 352 | |
| 353 | return err; |
| 354 | } |
| 355 | |
| 356 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
| 357 | struct dentry *newent) |
| 358 | { |
| 359 | int err; |
| 360 | struct fuse_link_in inarg; |
| 361 | struct inode *inode = entry->d_inode; |
| 362 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 363 | struct fuse_req *req = fuse_get_request(fc); |
| 364 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 365 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 366 | |
| 367 | memset(&inarg, 0, sizeof(inarg)); |
| 368 | inarg.oldnodeid = get_node_id(inode); |
| 369 | req->in.h.opcode = FUSE_LINK; |
| 370 | req->inode2 = inode; |
| 371 | req->in.numargs = 2; |
| 372 | req->in.args[0].size = sizeof(inarg); |
| 373 | req->in.args[0].value = &inarg; |
| 374 | req->in.args[1].size = newent->d_name.len + 1; |
| 375 | req->in.args[1].value = newent->d_name.name; |
| 376 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); |
| 377 | /* Contrary to "normal" filesystems it can happen that link |
| 378 | makes two "logical" inodes point to the same "physical" |
| 379 | inode. We invalidate the attributes of the old one, so it |
| 380 | will reflect changes in the backing inode (link count, |
| 381 | etc.) |
| 382 | */ |
| 383 | if (!err || err == -EINTR) |
| 384 | fuse_invalidate_attr(inode); |
| 385 | return err; |
| 386 | } |
| 387 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 388 | int fuse_do_getattr(struct inode *inode) |
| 389 | { |
| 390 | int err; |
| 391 | struct fuse_attr_out arg; |
| 392 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 393 | struct fuse_req *req = fuse_get_request(fc); |
| 394 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 395 | return -EINTR; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 396 | |
| 397 | req->in.h.opcode = FUSE_GETATTR; |
| 398 | req->in.h.nodeid = get_node_id(inode); |
| 399 | req->inode = inode; |
| 400 | req->out.numargs = 1; |
| 401 | req->out.args[0].size = sizeof(arg); |
| 402 | req->out.args[0].value = &arg; |
| 403 | request_send(fc, req); |
| 404 | err = req->out.h.error; |
| 405 | fuse_put_request(fc, req); |
| 406 | if (!err) { |
| 407 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { |
| 408 | make_bad_inode(inode); |
| 409 | err = -EIO; |
| 410 | } else { |
| 411 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 412 | fuse_change_attributes(inode, &arg.attr); |
| 413 | fi->i_time = time_to_jiffies(arg.attr_valid, |
| 414 | arg.attr_valid_nsec); |
| 415 | } |
| 416 | } |
| 417 | return err; |
| 418 | } |
| 419 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 420 | /* |
| 421 | * Calling into a user-controlled filesystem gives the filesystem |
| 422 | * daemon ptrace-like capabilities over the requester process. This |
| 423 | * means, that the filesystem daemon is able to record the exact |
| 424 | * filesystem operations performed, and can also control the behavior |
| 425 | * of the requester process in otherwise impossible ways. For example |
| 426 | * it can delay the operation for arbitrary length of time allowing |
| 427 | * DoS against the requester. |
| 428 | * |
| 429 | * For this reason only those processes can call into the filesystem, |
| 430 | * for which the owner of the mount has ptrace privilege. This |
| 431 | * excludes processes started by other users, suid or sgid processes. |
| 432 | */ |
| 433 | static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
| 434 | { |
| 435 | if (fc->flags & FUSE_ALLOW_OTHER) |
| 436 | return 1; |
| 437 | |
| 438 | if (task->euid == fc->user_id && |
| 439 | task->suid == fc->user_id && |
| 440 | task->uid == fc->user_id && |
| 441 | task->egid == fc->group_id && |
| 442 | task->sgid == fc->group_id && |
| 443 | task->gid == fc->group_id) |
| 444 | return 1; |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 449 | static int fuse_revalidate(struct dentry *entry) |
| 450 | { |
| 451 | struct inode *inode = entry->d_inode; |
| 452 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 453 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 454 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 455 | if (!fuse_allow_task(fc, current)) |
| 456 | return -EACCES; |
| 457 | if (get_node_id(inode) != FUSE_ROOT_ID && |
| 458 | time_before_eq(jiffies, fi->i_time)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 459 | return 0; |
| 460 | |
| 461 | return fuse_do_getattr(inode); |
| 462 | } |
| 463 | |
| 464 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
| 465 | { |
| 466 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 467 | |
Miklos Szeredi | 87729a5 | 2005-09-09 13:10:34 -0700 | [diff] [blame] | 468 | if (!fuse_allow_task(fc, current)) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 469 | return -EACCES; |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 470 | else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
| 471 | int err = generic_permission(inode, mask, NULL); |
| 472 | |
| 473 | /* If permission is denied, try to refresh file |
| 474 | attributes. This is also needed, because the root |
| 475 | node will at first have no permissions */ |
| 476 | if (err == -EACCES) { |
| 477 | err = fuse_do_getattr(inode); |
| 478 | if (!err) |
| 479 | err = generic_permission(inode, mask, NULL); |
| 480 | } |
| 481 | |
| 482 | /* FIXME: Need some mechanism to revoke permissions: |
| 483 | currently if the filesystem suddenly changes the |
| 484 | file mode, we will not be informed about it, and |
| 485 | continue to allow access to the file/directory. |
| 486 | |
| 487 | This is actually not so grave, since the user can |
| 488 | simply keep access to the file/directory anyway by |
| 489 | keeping it open... */ |
| 490 | |
| 491 | return err; |
| 492 | } else { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 493 | int mode = inode->i_mode; |
| 494 | if ((mask & MAY_WRITE) && IS_RDONLY(inode) && |
| 495 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) |
| 496 | return -EROFS; |
| 497 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) |
| 498 | return -EACCES; |
| 499 | return 0; |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, |
| 504 | void *dstbuf, filldir_t filldir) |
| 505 | { |
| 506 | while (nbytes >= FUSE_NAME_OFFSET) { |
| 507 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; |
| 508 | size_t reclen = FUSE_DIRENT_SIZE(dirent); |
| 509 | int over; |
| 510 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
| 511 | return -EIO; |
| 512 | if (reclen > nbytes) |
| 513 | break; |
| 514 | |
| 515 | over = filldir(dstbuf, dirent->name, dirent->namelen, |
| 516 | file->f_pos, dirent->ino, dirent->type); |
| 517 | if (over) |
| 518 | break; |
| 519 | |
| 520 | buf += reclen; |
| 521 | nbytes -= reclen; |
| 522 | file->f_pos = dirent->off; |
| 523 | } |
| 524 | |
| 525 | return 0; |
| 526 | } |
| 527 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 528 | static inline size_t fuse_send_readdir(struct fuse_req *req, struct file *file, |
| 529 | struct inode *inode, loff_t pos, |
| 530 | size_t count) |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 531 | { |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 532 | return fuse_send_read_common(req, file, inode, pos, count, 1); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
| 536 | { |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 537 | int err; |
| 538 | size_t nbytes; |
| 539 | struct page *page; |
| 540 | struct inode *inode = file->f_dentry->d_inode; |
| 541 | struct fuse_conn *fc = get_fuse_conn(inode); |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 542 | struct fuse_req *req = fuse_get_request(fc); |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 543 | if (!req) |
| 544 | return -EINTR; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 545 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 546 | page = alloc_page(GFP_KERNEL); |
| 547 | if (!page) { |
| 548 | fuse_put_request(fc, req); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 549 | return -ENOMEM; |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 550 | } |
| 551 | req->num_pages = 1; |
| 552 | req->pages[0] = page; |
| 553 | nbytes = fuse_send_readdir(req, file, inode, file->f_pos, PAGE_SIZE); |
| 554 | err = req->out.h.error; |
| 555 | fuse_put_request(fc, req); |
| 556 | if (!err) |
| 557 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
| 558 | filldir); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 559 | |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 560 | __free_page(page); |
Miklos Szeredi | b36c31b | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 561 | fuse_invalidate_attr(inode); /* atime changed */ |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 562 | return err; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | static char *read_link(struct dentry *dentry) |
| 566 | { |
| 567 | struct inode *inode = dentry->d_inode; |
| 568 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 569 | struct fuse_req *req = fuse_get_request(fc); |
| 570 | char *link; |
| 571 | |
| 572 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 573 | return ERR_PTR(-EINTR); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 574 | |
| 575 | link = (char *) __get_free_page(GFP_KERNEL); |
| 576 | if (!link) { |
| 577 | link = ERR_PTR(-ENOMEM); |
| 578 | goto out; |
| 579 | } |
| 580 | req->in.h.opcode = FUSE_READLINK; |
| 581 | req->in.h.nodeid = get_node_id(inode); |
| 582 | req->inode = inode; |
| 583 | req->out.argvar = 1; |
| 584 | req->out.numargs = 1; |
| 585 | req->out.args[0].size = PAGE_SIZE - 1; |
| 586 | req->out.args[0].value = link; |
| 587 | request_send(fc, req); |
| 588 | if (req->out.h.error) { |
| 589 | free_page((unsigned long) link); |
| 590 | link = ERR_PTR(req->out.h.error); |
| 591 | } else |
| 592 | link[req->out.args[0].size] = '\0'; |
| 593 | out: |
| 594 | fuse_put_request(fc, req); |
Miklos Szeredi | b36c31b | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 595 | fuse_invalidate_attr(inode); /* atime changed */ |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 596 | return link; |
| 597 | } |
| 598 | |
| 599 | static void free_link(char *link) |
| 600 | { |
| 601 | if (!IS_ERR(link)) |
| 602 | free_page((unsigned long) link); |
| 603 | } |
| 604 | |
| 605 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 606 | { |
| 607 | nd_set_link(nd, read_link(dentry)); |
| 608 | return NULL; |
| 609 | } |
| 610 | |
| 611 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) |
| 612 | { |
| 613 | free_link(nd_get_link(nd)); |
| 614 | } |
| 615 | |
| 616 | static int fuse_dir_open(struct inode *inode, struct file *file) |
| 617 | { |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 618 | return fuse_open_common(inode, file, 1); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | static int fuse_dir_release(struct inode *inode, struct file *file) |
| 622 | { |
Miklos Szeredi | 04730fe | 2005-09-09 13:10:36 -0700 | [diff] [blame] | 623 | return fuse_release_common(inode, file, 1); |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 624 | } |
| 625 | |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 626 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
| 627 | { |
| 628 | /* nfsd can call this with no file */ |
| 629 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; |
| 630 | } |
| 631 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 632 | static unsigned iattr_to_fattr(struct iattr *iattr, struct fuse_attr *fattr) |
| 633 | { |
| 634 | unsigned ivalid = iattr->ia_valid; |
| 635 | unsigned fvalid = 0; |
| 636 | |
| 637 | memset(fattr, 0, sizeof(*fattr)); |
| 638 | |
| 639 | if (ivalid & ATTR_MODE) |
| 640 | fvalid |= FATTR_MODE, fattr->mode = iattr->ia_mode; |
| 641 | if (ivalid & ATTR_UID) |
| 642 | fvalid |= FATTR_UID, fattr->uid = iattr->ia_uid; |
| 643 | if (ivalid & ATTR_GID) |
| 644 | fvalid |= FATTR_GID, fattr->gid = iattr->ia_gid; |
| 645 | if (ivalid & ATTR_SIZE) |
| 646 | fvalid |= FATTR_SIZE, fattr->size = iattr->ia_size; |
| 647 | /* You can only _set_ these together (they may change by themselves) */ |
| 648 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { |
| 649 | fvalid |= FATTR_ATIME | FATTR_MTIME; |
| 650 | fattr->atime = iattr->ia_atime.tv_sec; |
| 651 | fattr->mtime = iattr->ia_mtime.tv_sec; |
| 652 | } |
| 653 | |
| 654 | return fvalid; |
| 655 | } |
| 656 | |
| 657 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
| 658 | { |
| 659 | struct inode *inode = entry->d_inode; |
| 660 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 661 | struct fuse_inode *fi = get_fuse_inode(inode); |
| 662 | struct fuse_req *req; |
| 663 | struct fuse_setattr_in inarg; |
| 664 | struct fuse_attr_out outarg; |
| 665 | int err; |
| 666 | int is_truncate = 0; |
| 667 | |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 668 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
| 669 | err = inode_change_ok(inode, attr); |
| 670 | if (err) |
| 671 | return err; |
| 672 | } |
| 673 | |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 674 | if (attr->ia_valid & ATTR_SIZE) { |
| 675 | unsigned long limit; |
| 676 | is_truncate = 1; |
| 677 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
| 678 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { |
| 679 | send_sig(SIGXFSZ, current, 0); |
| 680 | return -EFBIG; |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | req = fuse_get_request(fc); |
| 685 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 686 | return -EINTR; |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 687 | |
| 688 | memset(&inarg, 0, sizeof(inarg)); |
| 689 | inarg.valid = iattr_to_fattr(attr, &inarg.attr); |
| 690 | req->in.h.opcode = FUSE_SETATTR; |
| 691 | req->in.h.nodeid = get_node_id(inode); |
| 692 | req->inode = inode; |
| 693 | req->in.numargs = 1; |
| 694 | req->in.args[0].size = sizeof(inarg); |
| 695 | req->in.args[0].value = &inarg; |
| 696 | req->out.numargs = 1; |
| 697 | req->out.args[0].size = sizeof(outarg); |
| 698 | req->out.args[0].value = &outarg; |
| 699 | request_send(fc, req); |
| 700 | err = req->out.h.error; |
| 701 | fuse_put_request(fc, req); |
| 702 | if (!err) { |
| 703 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
| 704 | make_bad_inode(inode); |
| 705 | err = -EIO; |
| 706 | } else { |
| 707 | if (is_truncate) { |
| 708 | loff_t origsize = i_size_read(inode); |
| 709 | i_size_write(inode, outarg.attr.size); |
| 710 | if (origsize > outarg.attr.size) |
| 711 | vmtruncate(inode, outarg.attr.size); |
| 712 | } |
| 713 | fuse_change_attributes(inode, &outarg.attr); |
| 714 | fi->i_time = time_to_jiffies(outarg.attr_valid, |
| 715 | outarg.attr_valid_nsec); |
| 716 | } |
| 717 | } else if (err == -EINTR) |
| 718 | fuse_invalidate_attr(inode); |
| 719 | |
| 720 | return err; |
| 721 | } |
| 722 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 723 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
| 724 | struct kstat *stat) |
| 725 | { |
| 726 | struct inode *inode = entry->d_inode; |
| 727 | int err = fuse_revalidate(entry); |
| 728 | if (!err) |
| 729 | generic_fillattr(inode, stat); |
| 730 | |
| 731 | return err; |
| 732 | } |
| 733 | |
| 734 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
| 735 | struct nameidata *nd) |
| 736 | { |
| 737 | struct inode *inode; |
| 738 | int err = fuse_lookup_iget(dir, entry, &inode); |
| 739 | if (err) |
| 740 | return ERR_PTR(err); |
| 741 | if (inode && S_ISDIR(inode->i_mode)) { |
| 742 | /* Don't allow creating an alias to a directory */ |
| 743 | struct dentry *alias = d_find_alias(inode); |
Miklos Szeredi | f12ec44 | 2005-10-30 15:02:25 -0800 | [diff] [blame^] | 744 | if (alias) { |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 745 | dput(alias); |
| 746 | iput(inode); |
| 747 | return ERR_PTR(-EIO); |
| 748 | } |
| 749 | } |
Miklos Szeredi | f12ec44 | 2005-10-30 15:02:25 -0800 | [diff] [blame^] | 750 | d_add(entry, inode); |
| 751 | return NULL; |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 752 | } |
| 753 | |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 754 | static int fuse_setxattr(struct dentry *entry, const char *name, |
| 755 | const void *value, size_t size, int flags) |
| 756 | { |
| 757 | struct inode *inode = entry->d_inode; |
| 758 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 759 | struct fuse_req *req; |
| 760 | struct fuse_setxattr_in inarg; |
| 761 | int err; |
| 762 | |
| 763 | if (size > FUSE_XATTR_SIZE_MAX) |
| 764 | return -E2BIG; |
| 765 | |
| 766 | if (fc->no_setxattr) |
| 767 | return -EOPNOTSUPP; |
| 768 | |
| 769 | req = fuse_get_request(fc); |
| 770 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 771 | return -EINTR; |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 772 | |
| 773 | memset(&inarg, 0, sizeof(inarg)); |
| 774 | inarg.size = size; |
| 775 | inarg.flags = flags; |
| 776 | req->in.h.opcode = FUSE_SETXATTR; |
| 777 | req->in.h.nodeid = get_node_id(inode); |
| 778 | req->inode = inode; |
| 779 | req->in.numargs = 3; |
| 780 | req->in.args[0].size = sizeof(inarg); |
| 781 | req->in.args[0].value = &inarg; |
| 782 | req->in.args[1].size = strlen(name) + 1; |
| 783 | req->in.args[1].value = name; |
| 784 | req->in.args[2].size = size; |
| 785 | req->in.args[2].value = value; |
| 786 | request_send(fc, req); |
| 787 | err = req->out.h.error; |
| 788 | fuse_put_request(fc, req); |
| 789 | if (err == -ENOSYS) { |
| 790 | fc->no_setxattr = 1; |
| 791 | err = -EOPNOTSUPP; |
| 792 | } |
| 793 | return err; |
| 794 | } |
| 795 | |
| 796 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, |
| 797 | void *value, size_t size) |
| 798 | { |
| 799 | struct inode *inode = entry->d_inode; |
| 800 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 801 | struct fuse_req *req; |
| 802 | struct fuse_getxattr_in inarg; |
| 803 | struct fuse_getxattr_out outarg; |
| 804 | ssize_t ret; |
| 805 | |
| 806 | if (fc->no_getxattr) |
| 807 | return -EOPNOTSUPP; |
| 808 | |
| 809 | req = fuse_get_request(fc); |
| 810 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 811 | return -EINTR; |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 812 | |
| 813 | memset(&inarg, 0, sizeof(inarg)); |
| 814 | inarg.size = size; |
| 815 | req->in.h.opcode = FUSE_GETXATTR; |
| 816 | req->in.h.nodeid = get_node_id(inode); |
| 817 | req->inode = inode; |
| 818 | req->in.numargs = 2; |
| 819 | req->in.args[0].size = sizeof(inarg); |
| 820 | req->in.args[0].value = &inarg; |
| 821 | req->in.args[1].size = strlen(name) + 1; |
| 822 | req->in.args[1].value = name; |
| 823 | /* This is really two different operations rolled into one */ |
| 824 | req->out.numargs = 1; |
| 825 | if (size) { |
| 826 | req->out.argvar = 1; |
| 827 | req->out.args[0].size = size; |
| 828 | req->out.args[0].value = value; |
| 829 | } else { |
| 830 | req->out.args[0].size = sizeof(outarg); |
| 831 | req->out.args[0].value = &outarg; |
| 832 | } |
| 833 | request_send(fc, req); |
| 834 | ret = req->out.h.error; |
| 835 | if (!ret) |
| 836 | ret = size ? req->out.args[0].size : outarg.size; |
| 837 | else { |
| 838 | if (ret == -ENOSYS) { |
| 839 | fc->no_getxattr = 1; |
| 840 | ret = -EOPNOTSUPP; |
| 841 | } |
| 842 | } |
| 843 | fuse_put_request(fc, req); |
| 844 | return ret; |
| 845 | } |
| 846 | |
| 847 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) |
| 848 | { |
| 849 | struct inode *inode = entry->d_inode; |
| 850 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 851 | struct fuse_req *req; |
| 852 | struct fuse_getxattr_in inarg; |
| 853 | struct fuse_getxattr_out outarg; |
| 854 | ssize_t ret; |
| 855 | |
| 856 | if (fc->no_listxattr) |
| 857 | return -EOPNOTSUPP; |
| 858 | |
| 859 | req = fuse_get_request(fc); |
| 860 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 861 | return -EINTR; |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 862 | |
| 863 | memset(&inarg, 0, sizeof(inarg)); |
| 864 | inarg.size = size; |
| 865 | req->in.h.opcode = FUSE_LISTXATTR; |
| 866 | req->in.h.nodeid = get_node_id(inode); |
| 867 | req->inode = inode; |
| 868 | req->in.numargs = 1; |
| 869 | req->in.args[0].size = sizeof(inarg); |
| 870 | req->in.args[0].value = &inarg; |
| 871 | /* This is really two different operations rolled into one */ |
| 872 | req->out.numargs = 1; |
| 873 | if (size) { |
| 874 | req->out.argvar = 1; |
| 875 | req->out.args[0].size = size; |
| 876 | req->out.args[0].value = list; |
| 877 | } else { |
| 878 | req->out.args[0].size = sizeof(outarg); |
| 879 | req->out.args[0].value = &outarg; |
| 880 | } |
| 881 | request_send(fc, req); |
| 882 | ret = req->out.h.error; |
| 883 | if (!ret) |
| 884 | ret = size ? req->out.args[0].size : outarg.size; |
| 885 | else { |
| 886 | if (ret == -ENOSYS) { |
| 887 | fc->no_listxattr = 1; |
| 888 | ret = -EOPNOTSUPP; |
| 889 | } |
| 890 | } |
| 891 | fuse_put_request(fc, req); |
| 892 | return ret; |
| 893 | } |
| 894 | |
| 895 | static int fuse_removexattr(struct dentry *entry, const char *name) |
| 896 | { |
| 897 | struct inode *inode = entry->d_inode; |
| 898 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 899 | struct fuse_req *req; |
| 900 | int err; |
| 901 | |
| 902 | if (fc->no_removexattr) |
| 903 | return -EOPNOTSUPP; |
| 904 | |
| 905 | req = fuse_get_request(fc); |
| 906 | if (!req) |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 907 | return -EINTR; |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 908 | |
| 909 | req->in.h.opcode = FUSE_REMOVEXATTR; |
| 910 | req->in.h.nodeid = get_node_id(inode); |
| 911 | req->inode = inode; |
| 912 | req->in.numargs = 1; |
| 913 | req->in.args[0].size = strlen(name) + 1; |
| 914 | req->in.args[0].value = name; |
| 915 | request_send(fc, req); |
| 916 | err = req->out.h.error; |
| 917 | fuse_put_request(fc, req); |
| 918 | if (err == -ENOSYS) { |
| 919 | fc->no_removexattr = 1; |
| 920 | err = -EOPNOTSUPP; |
| 921 | } |
| 922 | return err; |
| 923 | } |
| 924 | |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 925 | static struct inode_operations fuse_dir_inode_operations = { |
| 926 | .lookup = fuse_lookup, |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 927 | .mkdir = fuse_mkdir, |
| 928 | .symlink = fuse_symlink, |
| 929 | .unlink = fuse_unlink, |
| 930 | .rmdir = fuse_rmdir, |
| 931 | .rename = fuse_rename, |
| 932 | .link = fuse_link, |
| 933 | .setattr = fuse_setattr, |
| 934 | .create = fuse_create, |
| 935 | .mknod = fuse_mknod, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 936 | .permission = fuse_permission, |
| 937 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 938 | .setxattr = fuse_setxattr, |
| 939 | .getxattr = fuse_getxattr, |
| 940 | .listxattr = fuse_listxattr, |
| 941 | .removexattr = fuse_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 942 | }; |
| 943 | |
| 944 | static struct file_operations fuse_dir_operations = { |
Miklos Szeredi | b6aeade | 2005-09-09 13:10:30 -0700 | [diff] [blame] | 945 | .llseek = generic_file_llseek, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 946 | .read = generic_read_dir, |
| 947 | .readdir = fuse_readdir, |
| 948 | .open = fuse_dir_open, |
| 949 | .release = fuse_dir_release, |
Miklos Szeredi | 8254798 | 2005-09-09 13:10:38 -0700 | [diff] [blame] | 950 | .fsync = fuse_dir_fsync, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 951 | }; |
| 952 | |
| 953 | static struct inode_operations fuse_common_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 954 | .setattr = fuse_setattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 955 | .permission = fuse_permission, |
| 956 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 957 | .setxattr = fuse_setxattr, |
| 958 | .getxattr = fuse_getxattr, |
| 959 | .listxattr = fuse_listxattr, |
| 960 | .removexattr = fuse_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 961 | }; |
| 962 | |
| 963 | static struct inode_operations fuse_symlink_inode_operations = { |
Miklos Szeredi | 9e6268d | 2005-09-09 13:10:29 -0700 | [diff] [blame] | 964 | .setattr = fuse_setattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 965 | .follow_link = fuse_follow_link, |
| 966 | .put_link = fuse_put_link, |
| 967 | .readlink = generic_readlink, |
| 968 | .getattr = fuse_getattr, |
Miklos Szeredi | 92a8780 | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 969 | .setxattr = fuse_setxattr, |
| 970 | .getxattr = fuse_getxattr, |
| 971 | .listxattr = fuse_listxattr, |
| 972 | .removexattr = fuse_removexattr, |
Miklos Szeredi | e5e5558 | 2005-09-09 13:10:28 -0700 | [diff] [blame] | 973 | }; |
| 974 | |
| 975 | void fuse_init_common(struct inode *inode) |
| 976 | { |
| 977 | inode->i_op = &fuse_common_inode_operations; |
| 978 | } |
| 979 | |
| 980 | void fuse_init_dir(struct inode *inode) |
| 981 | { |
| 982 | inode->i_op = &fuse_dir_inode_operations; |
| 983 | inode->i_fop = &fuse_dir_operations; |
| 984 | } |
| 985 | |
| 986 | void fuse_init_symlink(struct inode *inode) |
| 987 | { |
| 988 | inode->i_op = &fuse_symlink_inode_operations; |
| 989 | } |