Eric Van Hensbergen | 2bad847 | 2005-09-09 13:04:19 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/fs/9p/vfs_inode.c |
| 3 | * |
| 4 | * This file contians vfs inode ops for the 9P2000 protocol. |
| 5 | * |
| 6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to: |
| 21 | * Free Software Foundation |
| 22 | * 51 Franklin Street, Fifth Floor |
| 23 | * Boston, MA 02111-1301 USA |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/file.h> |
| 31 | #include <linux/pagemap.h> |
| 32 | #include <linux/stat.h> |
| 33 | #include <linux/string.h> |
| 34 | #include <linux/smp_lock.h> |
| 35 | #include <linux/inet.h> |
| 36 | #include <linux/namei.h> |
| 37 | #include <linux/idr.h> |
| 38 | |
| 39 | #include "debug.h" |
| 40 | #include "v9fs.h" |
| 41 | #include "9p.h" |
| 42 | #include "v9fs_vfs.h" |
| 43 | #include "conv.h" |
| 44 | #include "fid.h" |
| 45 | |
| 46 | static struct inode_operations v9fs_dir_inode_operations; |
| 47 | static struct inode_operations v9fs_file_inode_operations; |
| 48 | static struct inode_operations v9fs_symlink_inode_operations; |
| 49 | |
| 50 | /** |
| 51 | * unixmode2p9mode - convert unix mode bits to plan 9 |
| 52 | * @v9ses: v9fs session information |
| 53 | * @mode: mode to convert |
| 54 | * |
| 55 | */ |
| 56 | |
| 57 | static inline int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
| 58 | { |
| 59 | int res; |
| 60 | res = mode & 0777; |
| 61 | if (S_ISDIR(mode)) |
| 62 | res |= V9FS_DMDIR; |
| 63 | if (v9ses->extended) { |
| 64 | if (S_ISLNK(mode)) |
| 65 | res |= V9FS_DMSYMLINK; |
| 66 | if (v9ses->nodev == 0) { |
| 67 | if (S_ISSOCK(mode)) |
| 68 | res |= V9FS_DMSOCKET; |
| 69 | if (S_ISFIFO(mode)) |
| 70 | res |= V9FS_DMNAMEDPIPE; |
| 71 | if (S_ISBLK(mode)) |
| 72 | res |= V9FS_DMDEVICE; |
| 73 | if (S_ISCHR(mode)) |
| 74 | res |= V9FS_DMDEVICE; |
| 75 | } |
| 76 | |
| 77 | if ((mode & S_ISUID) == S_ISUID) |
| 78 | res |= V9FS_DMSETUID; |
| 79 | if ((mode & S_ISGID) == S_ISGID) |
| 80 | res |= V9FS_DMSETGID; |
| 81 | if ((mode & V9FS_DMLINK)) |
| 82 | res |= V9FS_DMLINK; |
| 83 | } |
| 84 | |
| 85 | return res; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits |
| 90 | * @v9ses: v9fs session information |
| 91 | * @mode: mode to convert |
| 92 | * |
| 93 | */ |
| 94 | |
| 95 | static inline int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
| 96 | { |
| 97 | int res; |
| 98 | |
| 99 | res = mode & 0777; |
| 100 | |
| 101 | if ((mode & V9FS_DMDIR) == V9FS_DMDIR) |
| 102 | res |= S_IFDIR; |
| 103 | else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) |
| 104 | res |= S_IFLNK; |
| 105 | else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) |
| 106 | && (v9ses->nodev == 0)) |
| 107 | res |= S_IFSOCK; |
| 108 | else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) |
| 109 | && (v9ses->nodev == 0)) |
| 110 | res |= S_IFIFO; |
| 111 | else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) |
| 112 | && (v9ses->nodev == 0)) |
| 113 | res |= S_IFBLK; |
| 114 | else |
| 115 | res |= S_IFREG; |
| 116 | |
| 117 | if (v9ses->extended) { |
| 118 | if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) |
| 119 | res |= S_ISUID; |
| 120 | |
| 121 | if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) |
| 122 | res |= S_ISGID; |
| 123 | } |
| 124 | |
| 125 | return res; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * v9fs_blank_mistat - helper function to setup a 9P stat structure |
| 130 | * @v9ses: 9P session info (for determining extended mode) |
| 131 | * @mistat: structure to initialize |
| 132 | * |
| 133 | */ |
| 134 | |
| 135 | static inline void |
| 136 | v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat) |
| 137 | { |
| 138 | mistat->type = ~0; |
| 139 | mistat->dev = ~0; |
| 140 | mistat->qid.type = ~0; |
| 141 | mistat->qid.version = ~0; |
| 142 | *((long long *)&mistat->qid.path) = ~0; |
| 143 | mistat->mode = ~0; |
| 144 | mistat->atime = ~0; |
| 145 | mistat->mtime = ~0; |
| 146 | mistat->length = ~0; |
| 147 | mistat->name = mistat->data; |
| 148 | mistat->uid = mistat->data; |
| 149 | mistat->gid = mistat->data; |
| 150 | mistat->muid = mistat->data; |
| 151 | if (v9ses->extended) { |
| 152 | mistat->n_uid = ~0; |
| 153 | mistat->n_gid = ~0; |
| 154 | mistat->n_muid = ~0; |
| 155 | mistat->extension = mistat->data; |
| 156 | } |
| 157 | *mistat->data = 0; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * v9fs_mistat2unix - convert mistat to unix stat |
| 162 | * @mistat: Plan 9 metadata (mistat) structure |
| 163 | * @stat: unix metadata (stat) structure to populate |
| 164 | * @sb: superblock |
| 165 | * |
| 166 | */ |
| 167 | |
| 168 | static void |
| 169 | v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf, |
| 170 | struct super_block *sb) |
| 171 | { |
| 172 | struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL; |
| 173 | |
| 174 | buf->st_nlink = 1; |
| 175 | |
| 176 | buf->st_atime = mistat->atime; |
| 177 | buf->st_mtime = mistat->mtime; |
| 178 | buf->st_ctime = mistat->mtime; |
| 179 | |
| 180 | if (v9ses && v9ses->extended) { |
| 181 | /* TODO: string to uid mapping via user-space daemon */ |
| 182 | buf->st_uid = mistat->n_uid; |
| 183 | buf->st_gid = mistat->n_gid; |
| 184 | |
| 185 | sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); |
| 186 | sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); |
| 187 | } else { |
| 188 | buf->st_uid = v9ses->uid; |
| 189 | buf->st_gid = v9ses->gid; |
| 190 | } |
| 191 | |
| 192 | buf->st_uid = (unsigned short)-1; |
| 193 | buf->st_gid = (unsigned short)-1; |
| 194 | |
| 195 | if (v9ses && v9ses->extended) { |
| 196 | if (mistat->n_uid != -1) |
| 197 | sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); |
| 198 | |
| 199 | if (mistat->n_gid != -1) |
| 200 | sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); |
| 201 | } |
| 202 | |
| 203 | if (buf->st_uid == (unsigned short)-1) |
| 204 | buf->st_uid = v9ses->uid; |
| 205 | if (buf->st_gid == (unsigned short)-1) |
| 206 | buf->st_gid = v9ses->gid; |
| 207 | |
| 208 | buf->st_mode = p9mode2unixmode(v9ses, mistat->mode); |
| 209 | if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) { |
| 210 | char type = 0; |
| 211 | int major = -1; |
| 212 | int minor = -1; |
| 213 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); |
| 214 | switch (type) { |
| 215 | case 'c': |
| 216 | buf->st_mode &= ~S_IFBLK; |
| 217 | buf->st_mode |= S_IFCHR; |
| 218 | break; |
| 219 | case 'b': |
| 220 | break; |
| 221 | default: |
| 222 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", |
| 223 | type, mistat->extension); |
| 224 | }; |
| 225 | buf->st_rdev = MKDEV(major, minor); |
| 226 | } else |
| 227 | buf->st_rdev = 0; |
| 228 | |
| 229 | buf->st_size = mistat->length; |
| 230 | |
| 231 | buf->st_blksize = sb->s_blocksize; |
| 232 | buf->st_blocks = |
| 233 | (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits; |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * v9fs_get_inode - helper function to setup an inode |
| 238 | * @sb: superblock |
| 239 | * @mode: mode to setup inode with |
| 240 | * |
| 241 | */ |
| 242 | |
| 243 | struct inode *v9fs_get_inode(struct super_block *sb, int mode) |
| 244 | { |
| 245 | struct inode *inode = NULL; |
| 246 | |
| 247 | dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
| 248 | |
| 249 | inode = new_inode(sb); |
| 250 | if (inode) { |
| 251 | inode->i_mode = mode; |
| 252 | inode->i_uid = current->fsuid; |
| 253 | inode->i_gid = current->fsgid; |
| 254 | inode->i_blksize = sb->s_blocksize; |
| 255 | inode->i_blocks = 0; |
| 256 | inode->i_rdev = 0; |
| 257 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 258 | |
| 259 | switch (mode & S_IFMT) { |
| 260 | case S_IFIFO: |
| 261 | case S_IFBLK: |
| 262 | case S_IFCHR: |
| 263 | case S_IFSOCK: |
| 264 | case S_IFREG: |
| 265 | inode->i_op = &v9fs_file_inode_operations; |
| 266 | inode->i_fop = &v9fs_file_operations; |
| 267 | break; |
| 268 | case S_IFDIR: |
| 269 | inode->i_nlink++; |
| 270 | inode->i_op = &v9fs_dir_inode_operations; |
| 271 | inode->i_fop = &v9fs_dir_operations; |
| 272 | break; |
| 273 | case S_IFLNK: |
| 274 | inode->i_op = &v9fs_symlink_inode_operations; |
| 275 | break; |
| 276 | default: |
| 277 | dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", |
| 278 | mode, mode & S_IFMT); |
| 279 | return ERR_PTR(-EINVAL); |
| 280 | } |
| 281 | } else { |
| 282 | eprintk(KERN_WARNING, "Problem allocating inode\n"); |
| 283 | return ERR_PTR(-ENOMEM); |
| 284 | } |
| 285 | return inode; |
| 286 | } |
| 287 | |
| 288 | /** |
| 289 | * v9fs_create - helper function to create files and directories |
| 290 | * @dir: directory inode file is being created in |
| 291 | * @file_dentry: dentry file is being created in |
| 292 | * @perm: permissions file is being created with |
| 293 | * @open_mode: resulting open mode for file ??? |
| 294 | * |
| 295 | */ |
| 296 | |
| 297 | static int |
| 298 | v9fs_create(struct inode *dir, |
| 299 | struct dentry *file_dentry, |
| 300 | unsigned int perm, unsigned int open_mode) |
| 301 | { |
| 302 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
| 303 | struct super_block *sb = dir->i_sb; |
| 304 | struct v9fs_fid *dirfid = |
| 305 | v9fs_fid_lookup(file_dentry->d_parent, FID_WALK); |
| 306 | struct v9fs_fid *fid = NULL; |
| 307 | struct inode *file_inode = NULL; |
| 308 | struct v9fs_fcall *fcall = NULL; |
| 309 | struct v9fs_qid qid; |
| 310 | struct stat newstat; |
| 311 | int dirfidnum = -1; |
| 312 | long newfid = -1; |
| 313 | int result = 0; |
| 314 | unsigned int iounit = 0; |
| 315 | |
| 316 | perm = unixmode2p9mode(v9ses, perm); |
| 317 | |
| 318 | dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, |
| 319 | file_dentry, perm, open_mode); |
| 320 | |
| 321 | if (!dirfid) |
| 322 | return -EBADF; |
| 323 | |
| 324 | dirfidnum = dirfid->fid; |
| 325 | if (dirfidnum < 0) { |
| 326 | dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", |
| 327 | dir->i_ino); |
| 328 | return -EBADF; |
| 329 | } |
| 330 | |
| 331 | if (file_dentry->d_inode) { |
| 332 | dprintk(DEBUG_ERROR, |
| 333 | "Odd. There is an inode for dir %lu, name :%s:\n", |
| 334 | dir->i_ino, file_dentry->d_name.name); |
| 335 | return -EEXIST; |
| 336 | } |
| 337 | |
| 338 | newfid = v9fs_get_idpool(&v9ses->fidpool); |
| 339 | if (newfid < 0) { |
| 340 | eprintk(KERN_WARNING, "no free fids available\n"); |
| 341 | return -ENOSPC; |
| 342 | } |
| 343 | |
| 344 | result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); |
| 345 | if (result < 0) { |
| 346 | dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); |
| 347 | v9fs_put_idpool(newfid, &v9ses->fidpool); |
| 348 | newfid = 0; |
| 349 | goto CleanUpFid; |
| 350 | } |
| 351 | |
| 352 | kfree(fcall); |
| 353 | |
| 354 | result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, |
| 355 | perm, open_mode, &fcall); |
| 356 | if (result < 0) { |
| 357 | dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", |
| 358 | FCALL_ERROR(fcall), result); |
| 359 | |
| 360 | goto CleanUpFid; |
| 361 | } |
| 362 | |
| 363 | iounit = fcall->params.rcreate.iounit; |
| 364 | qid = fcall->params.rcreate.qid; |
| 365 | kfree(fcall); |
| 366 | |
| 367 | fid = v9fs_fid_create(file_dentry); |
| 368 | if (!fid) { |
| 369 | result = -ENOMEM; |
| 370 | goto CleanUpFid; |
| 371 | } |
| 372 | |
| 373 | fid->fid = newfid; |
| 374 | fid->fidopen = 0; |
| 375 | fid->fidcreate = 1; |
| 376 | fid->qid = qid; |
| 377 | fid->iounit = iounit; |
| 378 | fid->rdir_pos = 0; |
| 379 | fid->rdir_fcall = NULL; |
| 380 | fid->v9ses = v9ses; |
| 381 | |
| 382 | if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || |
| 383 | (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || |
| 384 | (perm & V9FS_DMDEVICE)) |
| 385 | return 0; |
| 386 | |
| 387 | result = v9fs_t_stat(v9ses, newfid, &fcall); |
| 388 | if (result < 0) { |
| 389 | dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), |
| 390 | result); |
| 391 | goto CleanUpFid; |
| 392 | } |
| 393 | |
| 394 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); |
| 395 | |
| 396 | file_inode = v9fs_get_inode(sb, newstat.st_mode); |
| 397 | if ((!file_inode) || IS_ERR(file_inode)) { |
| 398 | dprintk(DEBUG_ERROR, "create inode failed\n"); |
| 399 | result = -EBADF; |
| 400 | goto CleanUpFid; |
| 401 | } |
| 402 | |
| 403 | v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); |
| 404 | kfree(fcall); |
| 405 | d_instantiate(file_dentry, file_inode); |
| 406 | |
| 407 | if (perm & V9FS_DMDIR) { |
| 408 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) |
| 409 | dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n", |
| 410 | FCALL_ERROR(fcall)); |
| 411 | |
| 412 | v9fs_put_idpool(newfid, &v9ses->fidpool); |
| 413 | kfree(fcall); |
| 414 | fid->fidopen = 0; |
| 415 | fid->fidcreate = 0; |
| 416 | d_drop(file_dentry); |
| 417 | } |
| 418 | |
| 419 | return 0; |
| 420 | |
| 421 | CleanUpFid: |
| 422 | kfree(fcall); |
| 423 | |
| 424 | if (newfid) { |
| 425 | if (v9fs_t_clunk(v9ses, newfid, &fcall)) |
| 426 | dprintk(DEBUG_ERROR, "clunk failed: %s\n", |
| 427 | FCALL_ERROR(fcall)); |
| 428 | |
| 429 | v9fs_put_idpool(newfid, &v9ses->fidpool); |
| 430 | kfree(fcall); |
| 431 | } |
| 432 | return result; |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * v9fs_remove - helper function to remove files and directories |
| 437 | * @inode: directory inode that is being deleted |
| 438 | * @dentry: dentry that is being deleted |
| 439 | * @rmdir: where we are a file or a directory |
| 440 | * |
| 441 | */ |
| 442 | |
| 443 | static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) |
| 444 | { |
| 445 | struct v9fs_fcall *fcall = NULL; |
| 446 | struct super_block *sb = NULL; |
| 447 | struct v9fs_session_info *v9ses = NULL; |
| 448 | struct v9fs_fid *v9fid = NULL; |
| 449 | struct inode *file_inode = NULL; |
| 450 | int fid = -1; |
| 451 | int result = 0; |
| 452 | |
| 453 | dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
| 454 | rmdir); |
| 455 | |
| 456 | file_inode = file->d_inode; |
| 457 | sb = file_inode->i_sb; |
| 458 | v9ses = v9fs_inode2v9ses(file_inode); |
| 459 | v9fid = v9fs_fid_lookup(file, FID_OP); |
| 460 | |
| 461 | if (!v9fid) { |
| 462 | dprintk(DEBUG_ERROR, |
| 463 | "no v9fs_fid\n"); |
| 464 | return -EBADF; |
| 465 | } |
| 466 | |
| 467 | fid = v9fid->fid; |
| 468 | if (fid < 0) { |
| 469 | dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", |
| 470 | file_inode->i_ino); |
| 471 | return -EBADF; |
| 472 | } |
| 473 | |
| 474 | result = v9fs_t_remove(v9ses, fid, &fcall); |
| 475 | if (result < 0) |
| 476 | dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", |
| 477 | FCALL_ERROR(fcall), result); |
| 478 | else { |
| 479 | v9fs_put_idpool(fid, &v9ses->fidpool); |
| 480 | v9fs_fid_destroy(v9fid); |
| 481 | } |
| 482 | |
| 483 | kfree(fcall); |
| 484 | return result; |
| 485 | } |
| 486 | |
| 487 | /** |
| 488 | * v9fs_vfs_create - VFS hook to create files |
| 489 | * @inode: directory inode that is being deleted |
| 490 | * @dentry: dentry that is being deleted |
| 491 | * @perm: create permissions |
| 492 | * @nd: path information |
| 493 | * |
| 494 | */ |
| 495 | |
| 496 | static int |
| 497 | v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, |
| 498 | struct nameidata *nd) |
| 499 | { |
| 500 | return v9fs_create(inode, dentry, perm, O_RDWR); |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory |
| 505 | * @i: inode that is being unlinked |
| 506 | * @dentry: dentry that is being unlinked |
| 507 | * @mode: mode for new directory |
| 508 | * |
| 509 | */ |
| 510 | |
| 511 | static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) |
| 512 | { |
| 513 | return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); |
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode |
| 518 | * @dir: inode that is being walked from |
| 519 | * @dentry: dentry that is being walked to? |
| 520 | * @nameidata: path data |
| 521 | * |
| 522 | */ |
| 523 | |
| 524 | static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
| 525 | struct nameidata *nameidata) |
| 526 | { |
| 527 | struct super_block *sb; |
| 528 | struct v9fs_session_info *v9ses; |
| 529 | struct v9fs_fid *dirfid; |
| 530 | struct v9fs_fid *fid; |
| 531 | struct inode *inode; |
| 532 | struct v9fs_fcall *fcall = NULL; |
| 533 | struct stat newstat; |
| 534 | int dirfidnum = -1; |
| 535 | int newfid = -1; |
| 536 | int result = 0; |
| 537 | |
| 538 | dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
| 539 | dir, dentry->d_iname, dentry, nameidata); |
| 540 | |
| 541 | sb = dir->i_sb; |
| 542 | v9ses = v9fs_inode2v9ses(dir); |
| 543 | dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK); |
| 544 | |
| 545 | if (!dirfid) { |
| 546 | dprintk(DEBUG_ERROR, "no dirfid\n"); |
| 547 | return ERR_PTR(-EINVAL); |
| 548 | } |
| 549 | |
| 550 | dirfidnum = dirfid->fid; |
| 551 | |
| 552 | if (dirfidnum < 0) { |
| 553 | dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", |
| 554 | dir, dir->i_ino); |
| 555 | return ERR_PTR(-EBADF); |
| 556 | } |
| 557 | |
| 558 | newfid = v9fs_get_idpool(&v9ses->fidpool); |
| 559 | if (newfid < 0) { |
| 560 | eprintk(KERN_WARNING, "newfid fails!\n"); |
| 561 | return ERR_PTR(-ENOSPC); |
| 562 | } |
| 563 | |
| 564 | result = |
| 565 | v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, |
| 566 | NULL); |
| 567 | if (result < 0) { |
| 568 | v9fs_put_idpool(newfid, &v9ses->fidpool); |
| 569 | if (result == -ENOENT) { |
| 570 | d_add(dentry, NULL); |
| 571 | dprintk(DEBUG_ERROR, |
| 572 | "Return negative dentry %p count %d\n", |
| 573 | dentry, atomic_read(&dentry->d_count)); |
| 574 | return NULL; |
| 575 | } |
| 576 | dprintk(DEBUG_ERROR, "walk error:%d\n", result); |
| 577 | goto FreeFcall; |
| 578 | } |
| 579 | |
| 580 | result = v9fs_t_stat(v9ses, newfid, &fcall); |
| 581 | if (result < 0) { |
| 582 | dprintk(DEBUG_ERROR, "stat error\n"); |
| 583 | goto FreeFcall; |
| 584 | } |
| 585 | |
| 586 | v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); |
| 587 | inode = v9fs_get_inode(sb, newstat.st_mode); |
| 588 | |
| 589 | if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { |
| 590 | eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", |
| 591 | PTR_ERR(inode)); |
| 592 | |
| 593 | result = -ENOSPC; |
| 594 | goto FreeFcall; |
| 595 | } |
| 596 | |
| 597 | inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid); |
| 598 | |
| 599 | fid = v9fs_fid_create(dentry); |
| 600 | if (fid == NULL) { |
| 601 | dprintk(DEBUG_ERROR, "couldn't insert\n"); |
| 602 | result = -ENOMEM; |
| 603 | goto FreeFcall; |
| 604 | } |
| 605 | |
| 606 | fid->fid = newfid; |
| 607 | fid->fidopen = 0; |
| 608 | fid->v9ses = v9ses; |
| 609 | fid->qid = fcall->params.rstat.stat->qid; |
| 610 | |
| 611 | dentry->d_op = &v9fs_dentry_operations; |
| 612 | v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); |
| 613 | |
| 614 | d_add(dentry, inode); |
| 615 | kfree(fcall); |
| 616 | |
| 617 | return NULL; |
| 618 | |
| 619 | FreeFcall: |
| 620 | kfree(fcall); |
| 621 | return ERR_PTR(result); |
| 622 | } |
| 623 | |
| 624 | /** |
| 625 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode |
| 626 | * @i: inode that is being unlinked |
| 627 | * @dentry: dentry that is being unlinked |
| 628 | * |
| 629 | */ |
| 630 | |
| 631 | static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
| 632 | { |
| 633 | return v9fs_remove(i, d, 0); |
| 634 | } |
| 635 | |
| 636 | /** |
| 637 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory |
| 638 | * @i: inode that is being unlinked |
| 639 | * @dentry: dentry that is being unlinked |
| 640 | * |
| 641 | */ |
| 642 | |
| 643 | static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
| 644 | { |
| 645 | return v9fs_remove(i, d, 1); |
| 646 | } |
| 647 | |
| 648 | /** |
| 649 | * v9fs_vfs_rename - VFS hook to rename an inode |
| 650 | * @old_dir: old dir inode |
| 651 | * @old_dentry: old dentry |
| 652 | * @new_dir: new dir inode |
| 653 | * @new_dentry: new dentry |
| 654 | * |
| 655 | */ |
| 656 | |
| 657 | static int |
| 658 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 659 | struct inode *new_dir, struct dentry *new_dentry) |
| 660 | { |
| 661 | struct inode *old_inode = old_dentry->d_inode; |
| 662 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); |
| 663 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK); |
| 664 | struct v9fs_fid *olddirfid = |
| 665 | v9fs_fid_lookup(old_dentry->d_parent, FID_WALK); |
| 666 | struct v9fs_fid *newdirfid = |
| 667 | v9fs_fid_lookup(new_dentry->d_parent, FID_WALK); |
| 668 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
| 669 | struct v9fs_fcall *fcall = NULL; |
| 670 | int fid = -1; |
| 671 | int olddirfidnum = -1; |
| 672 | int newdirfidnum = -1; |
| 673 | int retval = 0; |
| 674 | |
| 675 | dprintk(DEBUG_VFS, "\n"); |
| 676 | |
| 677 | if ((!oldfid) || (!olddirfid) || (!newdirfid)) { |
| 678 | dprintk(DEBUG_ERROR, "problem with arguments\n"); |
| 679 | return -EBADF; |
| 680 | } |
| 681 | |
| 682 | /* 9P can only handle file rename in the same directory */ |
| 683 | if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { |
| 684 | dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); |
| 685 | retval = -EPERM; |
| 686 | goto FreeFcallnBail; |
| 687 | } |
| 688 | |
| 689 | fid = oldfid->fid; |
| 690 | olddirfidnum = olddirfid->fid; |
| 691 | newdirfidnum = newdirfid->fid; |
| 692 | |
| 693 | if (fid < 0) { |
| 694 | dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", |
| 695 | old_inode->i_ino); |
| 696 | retval = -EBADF; |
| 697 | goto FreeFcallnBail; |
| 698 | } |
| 699 | |
| 700 | v9fs_blank_mistat(v9ses, mistat); |
| 701 | |
| 702 | strcpy(mistat->data + 1, v9ses->name); |
| 703 | mistat->name = mistat->data + 1 + strlen(v9ses->name); |
| 704 | |
| 705 | if (new_dentry->d_name.len > |
| 706 | (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { |
| 707 | dprintk(DEBUG_ERROR, "new name too long\n"); |
| 708 | goto FreeFcallnBail; |
| 709 | } |
| 710 | |
| 711 | strcpy(mistat->name, new_dentry->d_name.name); |
| 712 | retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); |
| 713 | |
| 714 | FreeFcallnBail: |
| 715 | kfree(mistat); |
| 716 | |
| 717 | if (retval < 0) |
| 718 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", |
| 719 | FCALL_ERROR(fcall)); |
| 720 | |
| 721 | kfree(fcall); |
| 722 | return retval; |
| 723 | } |
| 724 | |
| 725 | /** |
| 726 | * v9fs_vfs_getattr - retreive file metadata |
| 727 | * @mnt - mount information |
| 728 | * @dentry - file to get attributes on |
| 729 | * @stat - metadata structure to populate |
| 730 | * |
| 731 | */ |
| 732 | |
| 733 | static int |
| 734 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 735 | struct kstat *stat) |
| 736 | { |
| 737 | struct v9fs_fcall *fcall = NULL; |
| 738 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| 739 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); |
| 740 | int err = -EPERM; |
| 741 | |
| 742 | dprintk(DEBUG_VFS, "dentry: %p\n", dentry); |
| 743 | if (!fid) { |
| 744 | dprintk(DEBUG_ERROR, |
| 745 | "couldn't find fid associated with dentry\n"); |
| 746 | return -EBADF; |
| 747 | } |
| 748 | |
| 749 | err = v9fs_t_stat(v9ses, fid->fid, &fcall); |
| 750 | |
| 751 | if (err < 0) |
| 752 | dprintk(DEBUG_ERROR, "stat error\n"); |
| 753 | else { |
| 754 | v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, |
| 755 | dentry->d_inode->i_sb); |
| 756 | generic_fillattr(dentry->d_inode, stat); |
| 757 | } |
| 758 | |
| 759 | kfree(fcall); |
| 760 | return err; |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * v9fs_vfs_setattr - set file metadata |
| 765 | * @dentry: file whose metadata to set |
| 766 | * @iattr: metadata assignment structure |
| 767 | * |
| 768 | */ |
| 769 | |
| 770 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) |
| 771 | { |
| 772 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| 773 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); |
| 774 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
| 775 | struct v9fs_fcall *fcall = NULL; |
| 776 | int res = -EPERM; |
| 777 | |
| 778 | dprintk(DEBUG_VFS, "\n"); |
| 779 | if (!fid) { |
| 780 | dprintk(DEBUG_ERROR, |
| 781 | "Couldn't find fid associated with dentry\n"); |
| 782 | return -EBADF; |
| 783 | } |
| 784 | |
| 785 | if (!mistat) |
| 786 | return -ENOMEM; |
| 787 | |
| 788 | v9fs_blank_mistat(v9ses, mistat); |
| 789 | if (iattr->ia_valid & ATTR_MODE) |
| 790 | mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
| 791 | |
| 792 | if (iattr->ia_valid & ATTR_MTIME) |
| 793 | mistat->mtime = iattr->ia_mtime.tv_sec; |
| 794 | |
| 795 | if (iattr->ia_valid & ATTR_ATIME) |
| 796 | mistat->atime = iattr->ia_atime.tv_sec; |
| 797 | |
| 798 | if (iattr->ia_valid & ATTR_SIZE) |
| 799 | mistat->length = iattr->ia_size; |
| 800 | |
| 801 | if (v9ses->extended) { |
| 802 | char *uid = kmalloc(strlen(mistat->uid), GFP_KERNEL); |
| 803 | char *gid = kmalloc(strlen(mistat->gid), GFP_KERNEL); |
| 804 | char *muid = kmalloc(strlen(mistat->muid), GFP_KERNEL); |
| 805 | char *name = kmalloc(strlen(mistat->name), GFP_KERNEL); |
| 806 | char *extension = kmalloc(strlen(mistat->extension), |
| 807 | GFP_KERNEL); |
| 808 | |
| 809 | if ((!uid) || (!gid) || (!muid) || (!name) || (!extension)) { |
| 810 | kfree(uid); |
| 811 | kfree(gid); |
| 812 | kfree(muid); |
| 813 | kfree(name); |
| 814 | kfree(extension); |
| 815 | |
| 816 | return -ENOMEM; |
| 817 | } |
| 818 | |
| 819 | strcpy(uid, mistat->uid); |
| 820 | strcpy(gid, mistat->gid); |
| 821 | strcpy(muid, mistat->muid); |
| 822 | strcpy(name, mistat->name); |
| 823 | strcpy(extension, mistat->extension); |
| 824 | |
| 825 | if (iattr->ia_valid & ATTR_UID) { |
| 826 | if (strlen(uid) != 8) { |
| 827 | dprintk(DEBUG_ERROR, "uid strlen is %u not 8\n", |
| 828 | (unsigned int)strlen(uid)); |
| 829 | sprintf(uid, "%08x", iattr->ia_uid); |
| 830 | } else { |
| 831 | kfree(uid); |
| 832 | uid = kmalloc(9, GFP_KERNEL); |
| 833 | } |
| 834 | |
| 835 | sprintf(uid, "%08x", iattr->ia_uid); |
| 836 | mistat->n_uid = iattr->ia_uid; |
| 837 | } |
| 838 | |
| 839 | if (iattr->ia_valid & ATTR_GID) { |
| 840 | if (strlen(gid) != 8) |
| 841 | dprintk(DEBUG_ERROR, "gid strlen is %u not 8\n", |
| 842 | (unsigned int)strlen(gid)); |
| 843 | else { |
| 844 | kfree(gid); |
| 845 | gid = kmalloc(9, GFP_KERNEL); |
| 846 | } |
| 847 | |
| 848 | sprintf(gid, "%08x", iattr->ia_gid); |
| 849 | mistat->n_gid = iattr->ia_gid; |
| 850 | } |
| 851 | |
| 852 | mistat->uid = mistat->data; |
| 853 | strcpy(mistat->uid, uid); |
| 854 | mistat->gid = mistat->data + strlen(uid) + 1; |
| 855 | strcpy(mistat->gid, gid); |
| 856 | mistat->muid = mistat->gid + strlen(gid) + 1; |
| 857 | strcpy(mistat->muid, muid); |
| 858 | mistat->name = mistat->muid + strlen(muid) + 1; |
| 859 | strcpy(mistat->name, name); |
| 860 | mistat->extension = mistat->name + strlen(name) + 1; |
| 861 | strcpy(mistat->extension, extension); |
| 862 | |
| 863 | kfree(uid); |
| 864 | kfree(gid); |
| 865 | kfree(muid); |
| 866 | kfree(name); |
| 867 | kfree(extension); |
| 868 | } |
| 869 | |
| 870 | res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); |
| 871 | |
| 872 | if (res < 0) |
| 873 | dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); |
| 874 | |
| 875 | kfree(mistat); |
| 876 | kfree(fcall); |
| 877 | |
| 878 | if (res >= 0) |
| 879 | res = inode_setattr(dentry->d_inode, iattr); |
| 880 | |
| 881 | return res; |
| 882 | } |
| 883 | |
| 884 | /** |
| 885 | * v9fs_mistat2inode - populate an inode structure with mistat info |
| 886 | * @mistat: Plan 9 metadata (mistat) structure |
| 887 | * @inode: inode to populate |
| 888 | * @sb: superblock of filesystem |
| 889 | * |
| 890 | */ |
| 891 | |
| 892 | void |
| 893 | v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, |
| 894 | struct super_block *sb) |
| 895 | { |
| 896 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
| 897 | |
| 898 | inode->i_nlink = 1; |
| 899 | |
| 900 | inode->i_atime.tv_sec = mistat->atime; |
| 901 | inode->i_mtime.tv_sec = mistat->mtime; |
| 902 | inode->i_ctime.tv_sec = mistat->mtime; |
| 903 | |
| 904 | inode->i_uid = -1; |
| 905 | inode->i_gid = -1; |
| 906 | |
| 907 | if (v9ses->extended) { |
| 908 | /* TODO: string to uid mapping via user-space daemon */ |
| 909 | inode->i_uid = mistat->n_uid; |
| 910 | inode->i_gid = mistat->n_gid; |
| 911 | |
| 912 | if (mistat->n_uid == -1) |
| 913 | sscanf(mistat->uid, "%x", &inode->i_uid); |
| 914 | |
| 915 | if (mistat->n_gid == -1) |
| 916 | sscanf(mistat->gid, "%x", &inode->i_gid); |
| 917 | } |
| 918 | |
| 919 | if (inode->i_uid == -1) |
| 920 | inode->i_uid = v9ses->uid; |
| 921 | if (inode->i_gid == -1) |
| 922 | inode->i_gid = v9ses->gid; |
| 923 | |
| 924 | inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); |
| 925 | if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
| 926 | char type = 0; |
| 927 | int major = -1; |
| 928 | int minor = -1; |
| 929 | sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); |
| 930 | switch (type) { |
| 931 | case 'c': |
| 932 | inode->i_mode &= ~S_IFBLK; |
| 933 | inode->i_mode |= S_IFCHR; |
| 934 | break; |
| 935 | case 'b': |
| 936 | break; |
| 937 | default: |
| 938 | dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", |
| 939 | type, mistat->extension); |
| 940 | }; |
| 941 | inode->i_rdev = MKDEV(major, minor); |
| 942 | } else |
| 943 | inode->i_rdev = 0; |
| 944 | |
| 945 | inode->i_size = mistat->length; |
| 946 | |
| 947 | inode->i_blksize = sb->s_blocksize; |
| 948 | inode->i_blocks = |
| 949 | (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; |
| 950 | } |
| 951 | |
| 952 | /** |
| 953 | * v9fs_qid2ino - convert qid into inode number |
| 954 | * @qid: qid to hash |
| 955 | * |
| 956 | * BUG: potential for inode number collisions? |
| 957 | */ |
| 958 | |
| 959 | ino_t v9fs_qid2ino(struct v9fs_qid *qid) |
| 960 | { |
| 961 | u64 path = qid->path + 2; |
| 962 | ino_t i = 0; |
| 963 | |
| 964 | if (sizeof(ino_t) == sizeof(path)) |
| 965 | memcpy(&i, &path, sizeof(ino_t)); |
| 966 | else |
| 967 | i = (ino_t) (path ^ (path >> 32)); |
| 968 | |
| 969 | return i; |
| 970 | } |
| 971 | |
| 972 | /** |
| 973 | * v9fs_vfs_symlink - helper function to create symlinks |
| 974 | * @dir: directory inode containing symlink |
| 975 | * @dentry: dentry for symlink |
| 976 | * @symname: symlink data |
| 977 | * |
| 978 | * See 9P2000.u RFC for more information |
| 979 | * |
| 980 | */ |
| 981 | |
| 982 | static int |
| 983 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
| 984 | { |
| 985 | int retval = -EPERM; |
| 986 | struct v9fs_fid *newfid; |
| 987 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
| 988 | struct super_block *sb = dir ? dir->i_sb : NULL; |
| 989 | struct v9fs_fcall *fcall = NULL; |
| 990 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
| 991 | |
| 992 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, |
| 993 | symname); |
| 994 | |
| 995 | if ((!dentry) || (!sb) || (!v9ses)) { |
| 996 | dprintk(DEBUG_ERROR, "problem with arguments\n"); |
| 997 | return -EBADF; |
| 998 | } |
| 999 | |
| 1000 | if (!v9ses->extended) { |
| 1001 | dprintk(DEBUG_ERROR, "not extended\n"); |
| 1002 | goto FreeFcall; |
| 1003 | } |
| 1004 | |
| 1005 | /* issue a create */ |
| 1006 | retval = v9fs_create(dir, dentry, S_IFLNK, 0); |
| 1007 | if (retval != 0) |
| 1008 | goto FreeFcall; |
| 1009 | |
| 1010 | newfid = v9fs_fid_lookup(dentry, FID_OP); |
| 1011 | |
| 1012 | /* issue a twstat */ |
| 1013 | v9fs_blank_mistat(v9ses, mistat); |
| 1014 | strcpy(mistat->data + 1, symname); |
| 1015 | mistat->extension = mistat->data + 1; |
| 1016 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); |
| 1017 | if (retval < 0) { |
| 1018 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", |
| 1019 | FCALL_ERROR(fcall)); |
| 1020 | goto FreeFcall; |
| 1021 | } |
| 1022 | |
| 1023 | kfree(fcall); |
| 1024 | |
| 1025 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { |
| 1026 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", |
| 1027 | FCALL_ERROR(fcall)); |
| 1028 | goto FreeFcall; |
| 1029 | } |
| 1030 | |
| 1031 | d_drop(dentry); /* FID - will this also clunk? */ |
| 1032 | |
| 1033 | FreeFcall: |
| 1034 | kfree(mistat); |
| 1035 | kfree(fcall); |
| 1036 | |
| 1037 | return retval; |
| 1038 | } |
| 1039 | |
| 1040 | /** |
| 1041 | * v9fs_readlink - read a symlink's location (internal version) |
| 1042 | * @dentry: dentry for symlink |
| 1043 | * @buf: buffer to load symlink location into |
| 1044 | * @buflen: length of buffer |
| 1045 | * |
| 1046 | */ |
| 1047 | |
| 1048 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) |
| 1049 | { |
| 1050 | int retval = -EPERM; |
| 1051 | |
| 1052 | struct v9fs_fcall *fcall = NULL; |
| 1053 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| 1054 | struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); |
| 1055 | |
| 1056 | if (!fid) { |
| 1057 | dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); |
| 1058 | retval = -EBADF; |
| 1059 | goto FreeFcall; |
| 1060 | } |
| 1061 | |
| 1062 | if (!v9ses->extended) { |
| 1063 | retval = -EBADF; |
| 1064 | dprintk(DEBUG_ERROR, "not extended\n"); |
| 1065 | goto FreeFcall; |
| 1066 | } |
| 1067 | |
| 1068 | dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); |
| 1069 | retval = v9fs_t_stat(v9ses, fid->fid, &fcall); |
| 1070 | |
| 1071 | if (retval < 0) { |
| 1072 | dprintk(DEBUG_ERROR, "stat error\n"); |
| 1073 | goto FreeFcall; |
| 1074 | } |
| 1075 | |
| 1076 | if (!fcall) |
| 1077 | return -EIO; |
| 1078 | |
| 1079 | if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { |
| 1080 | retval = -EINVAL; |
| 1081 | goto FreeFcall; |
| 1082 | } |
| 1083 | |
| 1084 | /* copy extension buffer into buffer */ |
| 1085 | if (strlen(fcall->params.rstat.stat->extension) < buflen) |
| 1086 | buflen = strlen(fcall->params.rstat.stat->extension); |
| 1087 | |
| 1088 | memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); |
| 1089 | |
| 1090 | retval = buflen; |
| 1091 | |
| 1092 | FreeFcall: |
| 1093 | kfree(fcall); |
| 1094 | |
| 1095 | return retval; |
| 1096 | } |
| 1097 | |
| 1098 | /** |
| 1099 | * v9fs_vfs_readlink - read a symlink's location |
| 1100 | * @dentry: dentry for symlink |
| 1101 | * @buf: buffer to load symlink location into |
| 1102 | * @buflen: length of buffer |
| 1103 | * |
| 1104 | */ |
| 1105 | |
| 1106 | static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, |
| 1107 | int buflen) |
| 1108 | { |
| 1109 | int retval; |
| 1110 | int ret; |
| 1111 | char *link = __getname(); |
| 1112 | |
| 1113 | if (strlen(link) < buflen) |
| 1114 | buflen = strlen(link); |
| 1115 | |
| 1116 | dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); |
| 1117 | |
| 1118 | retval = v9fs_readlink(dentry, link, buflen); |
| 1119 | |
| 1120 | if (retval > 0) { |
| 1121 | if ((ret = copy_to_user(buffer, link, retval)) != 0) { |
| 1122 | dprintk(DEBUG_ERROR, "problem copying to user: %d\n", |
| 1123 | ret); |
| 1124 | retval = ret; |
| 1125 | } |
| 1126 | } |
| 1127 | |
| 1128 | putname(link); |
| 1129 | return retval; |
| 1130 | } |
| 1131 | |
| 1132 | /** |
| 1133 | * v9fs_vfs_follow_link - follow a symlink path |
| 1134 | * @dentry: dentry for symlink |
| 1135 | * @nd: nameidata |
| 1136 | * |
| 1137 | */ |
| 1138 | |
| 1139 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 1140 | { |
| 1141 | int len = 0; |
| 1142 | char *link = __getname(); |
| 1143 | |
| 1144 | dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); |
| 1145 | |
| 1146 | if (!link) |
| 1147 | link = ERR_PTR(-ENOMEM); |
| 1148 | else { |
| 1149 | len = v9fs_readlink(dentry, link, strlen(link)); |
| 1150 | |
| 1151 | if (len < 0) { |
| 1152 | putname(link); |
| 1153 | link = ERR_PTR(len); |
| 1154 | } else |
| 1155 | link[len] = 0; |
| 1156 | } |
| 1157 | nd_set_link(nd, link); |
| 1158 | |
| 1159 | return NULL; |
| 1160 | } |
| 1161 | |
| 1162 | /** |
| 1163 | * v9fs_vfs_put_link - release a symlink path |
| 1164 | * @dentry: dentry for symlink |
| 1165 | * @nd: nameidata |
| 1166 | * |
| 1167 | */ |
| 1168 | |
| 1169 | static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
| 1170 | { |
| 1171 | char *s = nd_get_link(nd); |
| 1172 | |
| 1173 | dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); |
| 1174 | if (!IS_ERR(s)) |
| 1175 | putname(s); |
| 1176 | } |
| 1177 | |
| 1178 | /** |
| 1179 | * v9fs_vfs_link - create a hardlink |
| 1180 | * @old_dentry: dentry for file to link to |
| 1181 | * @dir: inode destination for new link |
| 1182 | * @new_dentry: dentry for link |
| 1183 | * |
| 1184 | */ |
| 1185 | |
| 1186 | /* XXX - lots of code dup'd from symlink and creates, |
| 1187 | * figure out a better reuse strategy |
| 1188 | */ |
| 1189 | |
| 1190 | static int |
| 1191 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, |
| 1192 | struct dentry *dentry) |
| 1193 | { |
| 1194 | int retval = -EPERM; |
| 1195 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
| 1196 | struct v9fs_fcall *fcall = NULL; |
| 1197 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
| 1198 | struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP); |
| 1199 | struct v9fs_fid *newfid = NULL; |
| 1200 | char *symname = __getname(); |
| 1201 | |
| 1202 | dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, |
| 1203 | old_dentry->d_name.name); |
| 1204 | |
| 1205 | if (!v9ses->extended) { |
| 1206 | dprintk(DEBUG_ERROR, "not extended\n"); |
| 1207 | goto FreeMem; |
| 1208 | } |
| 1209 | |
| 1210 | /* get fid of old_dentry */ |
| 1211 | sprintf(symname, "hardlink(%d)\n", oldfid->fid); |
| 1212 | |
| 1213 | /* issue a create */ |
| 1214 | retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); |
| 1215 | if (retval != 0) |
| 1216 | goto FreeMem; |
| 1217 | |
| 1218 | newfid = v9fs_fid_lookup(dentry, FID_OP); |
| 1219 | if (!newfid) { |
| 1220 | dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); |
| 1221 | goto FreeMem; |
| 1222 | } |
| 1223 | |
| 1224 | /* issue a twstat */ |
| 1225 | v9fs_blank_mistat(v9ses, mistat); |
| 1226 | strcpy(mistat->data + 1, symname); |
| 1227 | mistat->extension = mistat->data + 1; |
| 1228 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); |
| 1229 | if (retval < 0) { |
| 1230 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", |
| 1231 | FCALL_ERROR(fcall)); |
| 1232 | goto FreeMem; |
| 1233 | } |
| 1234 | |
| 1235 | kfree(fcall); |
| 1236 | |
| 1237 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { |
| 1238 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", |
| 1239 | FCALL_ERROR(fcall)); |
| 1240 | goto FreeMem; |
| 1241 | } |
| 1242 | |
| 1243 | d_drop(dentry); /* FID - will this also clunk? */ |
| 1244 | |
| 1245 | kfree(fcall); |
| 1246 | fcall = NULL; |
| 1247 | |
| 1248 | FreeMem: |
| 1249 | kfree(mistat); |
| 1250 | kfree(fcall); |
| 1251 | putname(symname); |
| 1252 | return retval; |
| 1253 | } |
| 1254 | |
| 1255 | /** |
| 1256 | * v9fs_vfs_mknod - create a special file |
| 1257 | * @dir: inode destination for new link |
| 1258 | * @dentry: dentry for file |
| 1259 | * @mode: mode for creation |
| 1260 | * @dev_t: device associated with special file |
| 1261 | * |
| 1262 | */ |
| 1263 | |
| 1264 | static int |
| 1265 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) |
| 1266 | { |
| 1267 | int retval = -EPERM; |
| 1268 | struct v9fs_fid *newfid; |
| 1269 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
| 1270 | struct v9fs_fcall *fcall = NULL; |
| 1271 | struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); |
| 1272 | char *symname = __getname(); |
| 1273 | |
| 1274 | dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, |
| 1275 | dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
| 1276 | |
| 1277 | if (!new_valid_dev(rdev)) { |
| 1278 | retval = -EINVAL; |
| 1279 | goto FreeMem; |
| 1280 | } |
| 1281 | |
| 1282 | if (!v9ses->extended) { |
| 1283 | dprintk(DEBUG_ERROR, "not extended\n"); |
| 1284 | goto FreeMem; |
| 1285 | } |
| 1286 | |
| 1287 | /* issue a create */ |
| 1288 | retval = v9fs_create(dir, dentry, mode, 0); |
| 1289 | |
| 1290 | if (retval != 0) |
| 1291 | goto FreeMem; |
| 1292 | |
| 1293 | newfid = v9fs_fid_lookup(dentry, FID_OP); |
| 1294 | if (!newfid) { |
| 1295 | dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); |
| 1296 | retval = -EINVAL; |
| 1297 | goto FreeMem; |
| 1298 | } |
| 1299 | |
| 1300 | /* build extension */ |
| 1301 | if (S_ISBLK(mode)) |
| 1302 | sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
| 1303 | else if (S_ISCHR(mode)) |
| 1304 | sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
| 1305 | else if (S_ISFIFO(mode)) ; /* DO NOTHING */ |
| 1306 | else { |
| 1307 | retval = -EINVAL; |
| 1308 | goto FreeMem; |
| 1309 | } |
| 1310 | |
| 1311 | if (!S_ISFIFO(mode)) { |
| 1312 | /* issue a twstat */ |
| 1313 | v9fs_blank_mistat(v9ses, mistat); |
| 1314 | strcpy(mistat->data + 1, symname); |
| 1315 | mistat->extension = mistat->data + 1; |
| 1316 | retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); |
| 1317 | if (retval < 0) { |
| 1318 | dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", |
| 1319 | FCALL_ERROR(fcall)); |
| 1320 | goto FreeMem; |
| 1321 | } |
| 1322 | |
| 1323 | kfree(fcall); |
| 1324 | } |
| 1325 | |
| 1326 | /* need to update dcache so we show up */ |
| 1327 | kfree(fcall); |
| 1328 | |
| 1329 | if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { |
| 1330 | dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", |
| 1331 | FCALL_ERROR(fcall)); |
| 1332 | goto FreeMem; |
| 1333 | } |
| 1334 | |
| 1335 | d_drop(dentry); /* FID - will this also clunk? */ |
| 1336 | |
| 1337 | FreeMem: |
| 1338 | kfree(mistat); |
| 1339 | kfree(fcall); |
| 1340 | putname(symname); |
| 1341 | |
| 1342 | return retval; |
| 1343 | } |
| 1344 | |
| 1345 | static struct inode_operations v9fs_dir_inode_operations = { |
| 1346 | .create = v9fs_vfs_create, |
| 1347 | .lookup = v9fs_vfs_lookup, |
| 1348 | .symlink = v9fs_vfs_symlink, |
| 1349 | .link = v9fs_vfs_link, |
| 1350 | .unlink = v9fs_vfs_unlink, |
| 1351 | .mkdir = v9fs_vfs_mkdir, |
| 1352 | .rmdir = v9fs_vfs_rmdir, |
| 1353 | .mknod = v9fs_vfs_mknod, |
| 1354 | .rename = v9fs_vfs_rename, |
| 1355 | .readlink = v9fs_vfs_readlink, |
| 1356 | .getattr = v9fs_vfs_getattr, |
| 1357 | .setattr = v9fs_vfs_setattr, |
| 1358 | }; |
| 1359 | |
| 1360 | static struct inode_operations v9fs_file_inode_operations = { |
| 1361 | .getattr = v9fs_vfs_getattr, |
| 1362 | .setattr = v9fs_vfs_setattr, |
| 1363 | }; |
| 1364 | |
| 1365 | static struct inode_operations v9fs_symlink_inode_operations = { |
| 1366 | .readlink = v9fs_vfs_readlink, |
| 1367 | .follow_link = v9fs_vfs_follow_link, |
| 1368 | .put_link = v9fs_vfs_put_link, |
| 1369 | .getattr = v9fs_vfs_getattr, |
| 1370 | .setattr = v9fs_vfs_setattr, |
| 1371 | }; |