| 1 | /* |
| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
| 3 | * |
| 4 | * Copyright © 2001-2007 Red Hat, Inc. |
| 5 | * |
| 6 | * Created by David Woodhouse <dwmw2@infradead.org> |
| 7 | * |
| 8 | * For licensing information, see the file 'LICENCE' in this directory. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/fs.h> |
| 15 | #include <linux/crc32.h> |
| 16 | #include <linux/jffs2.h> |
| 17 | #include "jffs2_fs_i.h" |
| 18 | #include "jffs2_fs_sb.h" |
| 19 | #include <linux/time.h> |
| 20 | #include "nodelist.h" |
| 21 | |
| 22 | static int jffs2_readdir (struct file *, void *, filldir_t); |
| 23 | |
| 24 | static int jffs2_create (struct inode *,struct dentry *,int, |
| 25 | struct nameidata *); |
| 26 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, |
| 27 | struct nameidata *); |
| 28 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); |
| 29 | static int jffs2_unlink (struct inode *,struct dentry *); |
| 30 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); |
| 31 | static int jffs2_mkdir (struct inode *,struct dentry *,int); |
| 32 | static int jffs2_rmdir (struct inode *,struct dentry *); |
| 33 | static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); |
| 34 | static int jffs2_rename (struct inode *, struct dentry *, |
| 35 | struct inode *, struct dentry *); |
| 36 | |
| 37 | const struct file_operations jffs2_dir_operations = |
| 38 | { |
| 39 | .read = generic_read_dir, |
| 40 | .readdir = jffs2_readdir, |
| 41 | .unlocked_ioctl=jffs2_ioctl, |
| 42 | .fsync = jffs2_fsync, |
| 43 | .llseek = generic_file_llseek, |
| 44 | }; |
| 45 | |
| 46 | |
| 47 | const struct inode_operations jffs2_dir_inode_operations = |
| 48 | { |
| 49 | .create = jffs2_create, |
| 50 | .lookup = jffs2_lookup, |
| 51 | .link = jffs2_link, |
| 52 | .unlink = jffs2_unlink, |
| 53 | .symlink = jffs2_symlink, |
| 54 | .mkdir = jffs2_mkdir, |
| 55 | .rmdir = jffs2_rmdir, |
| 56 | .mknod = jffs2_mknod, |
| 57 | .rename = jffs2_rename, |
| 58 | .check_acl = jffs2_check_acl, |
| 59 | .setattr = jffs2_setattr, |
| 60 | .setxattr = jffs2_setxattr, |
| 61 | .getxattr = jffs2_getxattr, |
| 62 | .listxattr = jffs2_listxattr, |
| 63 | .removexattr = jffs2_removexattr |
| 64 | }; |
| 65 | |
| 66 | /***********************************************************************/ |
| 67 | |
| 68 | |
| 69 | /* We keep the dirent list sorted in increasing order of name hash, |
| 70 | and we use the same hash function as the dentries. Makes this |
| 71 | nice and simple |
| 72 | */ |
| 73 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, |
| 74 | struct nameidata *nd) |
| 75 | { |
| 76 | struct jffs2_inode_info *dir_f; |
| 77 | struct jffs2_sb_info *c; |
| 78 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
| 79 | uint32_t ino = 0; |
| 80 | struct inode *inode = NULL; |
| 81 | |
| 82 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); |
| 83 | |
| 84 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
| 85 | return ERR_PTR(-ENAMETOOLONG); |
| 86 | |
| 87 | dir_f = JFFS2_INODE_INFO(dir_i); |
| 88 | c = JFFS2_SB_INFO(dir_i->i_sb); |
| 89 | |
| 90 | mutex_lock(&dir_f->sem); |
| 91 | |
| 92 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ |
| 93 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { |
| 94 | if (fd_list->nhash == target->d_name.hash && |
| 95 | (!fd || fd_list->version > fd->version) && |
| 96 | strlen(fd_list->name) == target->d_name.len && |
| 97 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { |
| 98 | fd = fd_list; |
| 99 | } |
| 100 | } |
| 101 | if (fd) |
| 102 | ino = fd->ino; |
| 103 | mutex_unlock(&dir_f->sem); |
| 104 | if (ino) { |
| 105 | inode = jffs2_iget(dir_i->i_sb, ino); |
| 106 | if (IS_ERR(inode)) { |
| 107 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); |
| 108 | return ERR_CAST(inode); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | return d_splice_alias(inode, target); |
| 113 | } |
| 114 | |
| 115 | /***********************************************************************/ |
| 116 | |
| 117 | |
| 118 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 119 | { |
| 120 | struct jffs2_inode_info *f; |
| 121 | struct jffs2_sb_info *c; |
| 122 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 123 | struct jffs2_full_dirent *fd; |
| 124 | unsigned long offset, curofs; |
| 125 | |
| 126 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); |
| 127 | |
| 128 | f = JFFS2_INODE_INFO(inode); |
| 129 | c = JFFS2_SB_INFO(inode->i_sb); |
| 130 | |
| 131 | offset = filp->f_pos; |
| 132 | |
| 133 | if (offset == 0) { |
| 134 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); |
| 135 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
| 136 | goto out; |
| 137 | offset++; |
| 138 | } |
| 139 | if (offset == 1) { |
| 140 | unsigned long pino = parent_ino(filp->f_path.dentry); |
| 141 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); |
| 142 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) |
| 143 | goto out; |
| 144 | offset++; |
| 145 | } |
| 146 | |
| 147 | curofs=1; |
| 148 | mutex_lock(&f->sem); |
| 149 | for (fd = f->dents; fd; fd = fd->next) { |
| 150 | |
| 151 | curofs++; |
| 152 | /* First loop: curofs = 2; offset = 2 */ |
| 153 | if (curofs < offset) { |
| 154 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
| 155 | fd->name, fd->ino, fd->type, curofs, offset)); |
| 156 | continue; |
| 157 | } |
| 158 | if (!fd->ino) { |
| 159 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); |
| 160 | offset++; |
| 161 | continue; |
| 162 | } |
| 163 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); |
| 164 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) |
| 165 | break; |
| 166 | offset++; |
| 167 | } |
| 168 | mutex_unlock(&f->sem); |
| 169 | out: |
| 170 | filp->f_pos = offset; |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | /***********************************************************************/ |
| 175 | |
| 176 | |
| 177 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, |
| 178 | struct nameidata *nd) |
| 179 | { |
| 180 | struct jffs2_raw_inode *ri; |
| 181 | struct jffs2_inode_info *f, *dir_f; |
| 182 | struct jffs2_sb_info *c; |
| 183 | struct inode *inode; |
| 184 | int ret; |
| 185 | |
| 186 | ri = jffs2_alloc_raw_inode(); |
| 187 | if (!ri) |
| 188 | return -ENOMEM; |
| 189 | |
| 190 | c = JFFS2_SB_INFO(dir_i->i_sb); |
| 191 | |
| 192 | D1(printk(KERN_DEBUG "jffs2_create()\n")); |
| 193 | |
| 194 | inode = jffs2_new_inode(dir_i, mode, ri); |
| 195 | |
| 196 | if (IS_ERR(inode)) { |
| 197 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); |
| 198 | jffs2_free_raw_inode(ri); |
| 199 | return PTR_ERR(inode); |
| 200 | } |
| 201 | |
| 202 | inode->i_op = &jffs2_file_inode_operations; |
| 203 | inode->i_fop = &jffs2_file_operations; |
| 204 | inode->i_mapping->a_ops = &jffs2_file_address_operations; |
| 205 | inode->i_mapping->nrpages = 0; |
| 206 | |
| 207 | f = JFFS2_INODE_INFO(inode); |
| 208 | dir_f = JFFS2_INODE_INFO(dir_i); |
| 209 | |
| 210 | /* jffs2_do_create() will want to lock it, _after_ reserving |
| 211 | space and taking c-alloc_sem. If we keep it locked here, |
| 212 | lockdep gets unhappy (although it's a false positive; |
| 213 | nothing else will be looking at this inode yet so there's |
| 214 | no chance of AB-BA deadlock involving its f->sem). */ |
| 215 | mutex_unlock(&f->sem); |
| 216 | |
| 217 | ret = jffs2_do_create(c, dir_f, f, ri, |
| 218 | dentry->d_name.name, dentry->d_name.len); |
| 219 | if (ret) |
| 220 | goto fail; |
| 221 | |
| 222 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); |
| 223 | |
| 224 | jffs2_free_raw_inode(ri); |
| 225 | d_instantiate(dentry, inode); |
| 226 | |
| 227 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
| 228 | inode->i_ino, inode->i_mode, inode->i_nlink, |
| 229 | f->inocache->pino_nlink, inode->i_mapping->nrpages)); |
| 230 | return 0; |
| 231 | |
| 232 | fail: |
| 233 | make_bad_inode(inode); |
| 234 | iput(inode); |
| 235 | jffs2_free_raw_inode(ri); |
| 236 | return ret; |
| 237 | } |
| 238 | |
| 239 | /***********************************************************************/ |
| 240 | |
| 241 | |
| 242 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) |
| 243 | { |
| 244 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
| 245 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
| 246 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); |
| 247 | int ret; |
| 248 | uint32_t now = get_seconds(); |
| 249 | |
| 250 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
| 251 | dentry->d_name.len, dead_f, now); |
| 252 | if (dead_f->inocache) |
| 253 | dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; |
| 254 | if (!ret) |
| 255 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
| 256 | return ret; |
| 257 | } |
| 258 | /***********************************************************************/ |
| 259 | |
| 260 | |
| 261 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) |
| 262 | { |
| 263 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); |
| 264 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); |
| 265 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
| 266 | int ret; |
| 267 | uint8_t type; |
| 268 | uint32_t now; |
| 269 | |
| 270 | /* Don't let people make hard links to bad inodes. */ |
| 271 | if (!f->inocache) |
| 272 | return -EIO; |
| 273 | |
| 274 | if (S_ISDIR(old_dentry->d_inode->i_mode)) |
| 275 | return -EPERM; |
| 276 | |
| 277 | /* XXX: This is ugly */ |
| 278 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; |
| 279 | if (!type) type = DT_REG; |
| 280 | |
| 281 | now = get_seconds(); |
| 282 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); |
| 283 | |
| 284 | if (!ret) { |
| 285 | mutex_lock(&f->sem); |
| 286 | old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; |
| 287 | mutex_unlock(&f->sem); |
| 288 | d_instantiate(dentry, old_dentry->d_inode); |
| 289 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
| 290 | atomic_inc(&old_dentry->d_inode->i_count); |
| 291 | } |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | /***********************************************************************/ |
| 296 | |
| 297 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) |
| 298 | { |
| 299 | struct jffs2_inode_info *f, *dir_f; |
| 300 | struct jffs2_sb_info *c; |
| 301 | struct inode *inode; |
| 302 | struct jffs2_raw_inode *ri; |
| 303 | struct jffs2_raw_dirent *rd; |
| 304 | struct jffs2_full_dnode *fn; |
| 305 | struct jffs2_full_dirent *fd; |
| 306 | int namelen; |
| 307 | uint32_t alloclen; |
| 308 | int ret, targetlen = strlen(target); |
| 309 | |
| 310 | /* FIXME: If you care. We'd need to use frags for the target |
| 311 | if it grows much more than this */ |
| 312 | if (targetlen > 254) |
| 313 | return -ENAMETOOLONG; |
| 314 | |
| 315 | ri = jffs2_alloc_raw_inode(); |
| 316 | |
| 317 | if (!ri) |
| 318 | return -ENOMEM; |
| 319 | |
| 320 | c = JFFS2_SB_INFO(dir_i->i_sb); |
| 321 | |
| 322 | /* Try to reserve enough space for both node and dirent. |
| 323 | * Just the node will do for now, though |
| 324 | */ |
| 325 | namelen = dentry->d_name.len; |
| 326 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
| 327 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
| 328 | |
| 329 | if (ret) { |
| 330 | jffs2_free_raw_inode(ri); |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
| 335 | |
| 336 | if (IS_ERR(inode)) { |
| 337 | jffs2_free_raw_inode(ri); |
| 338 | jffs2_complete_reservation(c); |
| 339 | return PTR_ERR(inode); |
| 340 | } |
| 341 | |
| 342 | inode->i_op = &jffs2_symlink_inode_operations; |
| 343 | |
| 344 | f = JFFS2_INODE_INFO(inode); |
| 345 | |
| 346 | inode->i_size = targetlen; |
| 347 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
| 348 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); |
| 349 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
| 350 | |
| 351 | ri->compr = JFFS2_COMPR_NONE; |
| 352 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
| 353 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
| 354 | |
| 355 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
| 356 | |
| 357 | jffs2_free_raw_inode(ri); |
| 358 | |
| 359 | if (IS_ERR(fn)) { |
| 360 | /* Eeek. Wave bye bye */ |
| 361 | mutex_unlock(&f->sem); |
| 362 | jffs2_complete_reservation(c); |
| 363 | jffs2_clear_inode(inode); |
| 364 | return PTR_ERR(fn); |
| 365 | } |
| 366 | |
| 367 | /* We use f->target field to store the target path. */ |
| 368 | f->target = kmalloc(targetlen + 1, GFP_KERNEL); |
| 369 | if (!f->target) { |
| 370 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
| 371 | mutex_unlock(&f->sem); |
| 372 | jffs2_complete_reservation(c); |
| 373 | jffs2_clear_inode(inode); |
| 374 | return -ENOMEM; |
| 375 | } |
| 376 | |
| 377 | memcpy(f->target, target, targetlen + 1); |
| 378 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); |
| 379 | |
| 380 | /* No data here. Only a metadata node, which will be |
| 381 | obsoleted by the first data write |
| 382 | */ |
| 383 | f->metadata = fn; |
| 384 | mutex_unlock(&f->sem); |
| 385 | |
| 386 | jffs2_complete_reservation(c); |
| 387 | |
| 388 | ret = jffs2_init_security(inode, dir_i); |
| 389 | if (ret) { |
| 390 | jffs2_clear_inode(inode); |
| 391 | return ret; |
| 392 | } |
| 393 | ret = jffs2_init_acl_post(inode); |
| 394 | if (ret) { |
| 395 | jffs2_clear_inode(inode); |
| 396 | return ret; |
| 397 | } |
| 398 | |
| 399 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
| 400 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
| 401 | if (ret) { |
| 402 | /* Eep. */ |
| 403 | jffs2_clear_inode(inode); |
| 404 | return ret; |
| 405 | } |
| 406 | |
| 407 | rd = jffs2_alloc_raw_dirent(); |
| 408 | if (!rd) { |
| 409 | /* Argh. Now we treat it like a normal delete */ |
| 410 | jffs2_complete_reservation(c); |
| 411 | jffs2_clear_inode(inode); |
| 412 | return -ENOMEM; |
| 413 | } |
| 414 | |
| 415 | dir_f = JFFS2_INODE_INFO(dir_i); |
| 416 | mutex_lock(&dir_f->sem); |
| 417 | |
| 418 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| 419 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); |
| 420 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); |
| 421 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); |
| 422 | |
| 423 | rd->pino = cpu_to_je32(dir_i->i_ino); |
| 424 | rd->version = cpu_to_je32(++dir_f->highest_version); |
| 425 | rd->ino = cpu_to_je32(inode->i_ino); |
| 426 | rd->mctime = cpu_to_je32(get_seconds()); |
| 427 | rd->nsize = namelen; |
| 428 | rd->type = DT_LNK; |
| 429 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
| 430 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); |
| 431 | |
| 432 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
| 433 | |
| 434 | if (IS_ERR(fd)) { |
| 435 | /* dirent failed to write. Delete the inode normally |
| 436 | as if it were the final unlink() */ |
| 437 | jffs2_complete_reservation(c); |
| 438 | jffs2_free_raw_dirent(rd); |
| 439 | mutex_unlock(&dir_f->sem); |
| 440 | jffs2_clear_inode(inode); |
| 441 | return PTR_ERR(fd); |
| 442 | } |
| 443 | |
| 444 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
| 445 | |
| 446 | jffs2_free_raw_dirent(rd); |
| 447 | |
| 448 | /* Link the fd into the inode's list, obsoleting an old |
| 449 | one if necessary. */ |
| 450 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); |
| 451 | |
| 452 | mutex_unlock(&dir_f->sem); |
| 453 | jffs2_complete_reservation(c); |
| 454 | |
| 455 | d_instantiate(dentry, inode); |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | |
| 460 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) |
| 461 | { |
| 462 | struct jffs2_inode_info *f, *dir_f; |
| 463 | struct jffs2_sb_info *c; |
| 464 | struct inode *inode; |
| 465 | struct jffs2_raw_inode *ri; |
| 466 | struct jffs2_raw_dirent *rd; |
| 467 | struct jffs2_full_dnode *fn; |
| 468 | struct jffs2_full_dirent *fd; |
| 469 | int namelen; |
| 470 | uint32_t alloclen; |
| 471 | int ret; |
| 472 | |
| 473 | mode |= S_IFDIR; |
| 474 | |
| 475 | ri = jffs2_alloc_raw_inode(); |
| 476 | if (!ri) |
| 477 | return -ENOMEM; |
| 478 | |
| 479 | c = JFFS2_SB_INFO(dir_i->i_sb); |
| 480 | |
| 481 | /* Try to reserve enough space for both node and dirent. |
| 482 | * Just the node will do for now, though |
| 483 | */ |
| 484 | namelen = dentry->d_name.len; |
| 485 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
| 486 | JFFS2_SUMMARY_INODE_SIZE); |
| 487 | |
| 488 | if (ret) { |
| 489 | jffs2_free_raw_inode(ri); |
| 490 | return ret; |
| 491 | } |
| 492 | |
| 493 | inode = jffs2_new_inode(dir_i, mode, ri); |
| 494 | |
| 495 | if (IS_ERR(inode)) { |
| 496 | jffs2_free_raw_inode(ri); |
| 497 | jffs2_complete_reservation(c); |
| 498 | return PTR_ERR(inode); |
| 499 | } |
| 500 | |
| 501 | inode->i_op = &jffs2_dir_inode_operations; |
| 502 | inode->i_fop = &jffs2_dir_operations; |
| 503 | |
| 504 | f = JFFS2_INODE_INFO(inode); |
| 505 | |
| 506 | /* Directories get nlink 2 at start */ |
| 507 | inode->i_nlink = 2; |
| 508 | /* but ic->pino_nlink is the parent ino# */ |
| 509 | f->inocache->pino_nlink = dir_i->i_ino; |
| 510 | |
| 511 | ri->data_crc = cpu_to_je32(0); |
| 512 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
| 513 | |
| 514 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
| 515 | |
| 516 | jffs2_free_raw_inode(ri); |
| 517 | |
| 518 | if (IS_ERR(fn)) { |
| 519 | /* Eeek. Wave bye bye */ |
| 520 | mutex_unlock(&f->sem); |
| 521 | jffs2_complete_reservation(c); |
| 522 | jffs2_clear_inode(inode); |
| 523 | return PTR_ERR(fn); |
| 524 | } |
| 525 | /* No data here. Only a metadata node, which will be |
| 526 | obsoleted by the first data write |
| 527 | */ |
| 528 | f->metadata = fn; |
| 529 | mutex_unlock(&f->sem); |
| 530 | |
| 531 | jffs2_complete_reservation(c); |
| 532 | |
| 533 | ret = jffs2_init_security(inode, dir_i); |
| 534 | if (ret) { |
| 535 | jffs2_clear_inode(inode); |
| 536 | return ret; |
| 537 | } |
| 538 | ret = jffs2_init_acl_post(inode); |
| 539 | if (ret) { |
| 540 | jffs2_clear_inode(inode); |
| 541 | return ret; |
| 542 | } |
| 543 | |
| 544 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
| 545 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
| 546 | if (ret) { |
| 547 | /* Eep. */ |
| 548 | jffs2_clear_inode(inode); |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | rd = jffs2_alloc_raw_dirent(); |
| 553 | if (!rd) { |
| 554 | /* Argh. Now we treat it like a normal delete */ |
| 555 | jffs2_complete_reservation(c); |
| 556 | jffs2_clear_inode(inode); |
| 557 | return -ENOMEM; |
| 558 | } |
| 559 | |
| 560 | dir_f = JFFS2_INODE_INFO(dir_i); |
| 561 | mutex_lock(&dir_f->sem); |
| 562 | |
| 563 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| 564 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); |
| 565 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); |
| 566 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); |
| 567 | |
| 568 | rd->pino = cpu_to_je32(dir_i->i_ino); |
| 569 | rd->version = cpu_to_je32(++dir_f->highest_version); |
| 570 | rd->ino = cpu_to_je32(inode->i_ino); |
| 571 | rd->mctime = cpu_to_je32(get_seconds()); |
| 572 | rd->nsize = namelen; |
| 573 | rd->type = DT_DIR; |
| 574 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
| 575 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); |
| 576 | |
| 577 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
| 578 | |
| 579 | if (IS_ERR(fd)) { |
| 580 | /* dirent failed to write. Delete the inode normally |
| 581 | as if it were the final unlink() */ |
| 582 | jffs2_complete_reservation(c); |
| 583 | jffs2_free_raw_dirent(rd); |
| 584 | mutex_unlock(&dir_f->sem); |
| 585 | jffs2_clear_inode(inode); |
| 586 | return PTR_ERR(fd); |
| 587 | } |
| 588 | |
| 589 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
| 590 | inc_nlink(dir_i); |
| 591 | |
| 592 | jffs2_free_raw_dirent(rd); |
| 593 | |
| 594 | /* Link the fd into the inode's list, obsoleting an old |
| 595 | one if necessary. */ |
| 596 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); |
| 597 | |
| 598 | mutex_unlock(&dir_f->sem); |
| 599 | jffs2_complete_reservation(c); |
| 600 | |
| 601 | d_instantiate(dentry, inode); |
| 602 | return 0; |
| 603 | } |
| 604 | |
| 605 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) |
| 606 | { |
| 607 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
| 608 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
| 609 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
| 610 | struct jffs2_full_dirent *fd; |
| 611 | int ret; |
| 612 | uint32_t now = get_seconds(); |
| 613 | |
| 614 | for (fd = f->dents ; fd; fd = fd->next) { |
| 615 | if (fd->ino) |
| 616 | return -ENOTEMPTY; |
| 617 | } |
| 618 | |
| 619 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
| 620 | dentry->d_name.len, f, now); |
| 621 | if (!ret) { |
| 622 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
| 623 | clear_nlink(dentry->d_inode); |
| 624 | drop_nlink(dir_i); |
| 625 | } |
| 626 | return ret; |
| 627 | } |
| 628 | |
| 629 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
| 630 | { |
| 631 | struct jffs2_inode_info *f, *dir_f; |
| 632 | struct jffs2_sb_info *c; |
| 633 | struct inode *inode; |
| 634 | struct jffs2_raw_inode *ri; |
| 635 | struct jffs2_raw_dirent *rd; |
| 636 | struct jffs2_full_dnode *fn; |
| 637 | struct jffs2_full_dirent *fd; |
| 638 | int namelen; |
| 639 | union jffs2_device_node dev; |
| 640 | int devlen = 0; |
| 641 | uint32_t alloclen; |
| 642 | int ret; |
| 643 | |
| 644 | if (!new_valid_dev(rdev)) |
| 645 | return -EINVAL; |
| 646 | |
| 647 | ri = jffs2_alloc_raw_inode(); |
| 648 | if (!ri) |
| 649 | return -ENOMEM; |
| 650 | |
| 651 | c = JFFS2_SB_INFO(dir_i->i_sb); |
| 652 | |
| 653 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
| 654 | devlen = jffs2_encode_dev(&dev, rdev); |
| 655 | |
| 656 | /* Try to reserve enough space for both node and dirent. |
| 657 | * Just the node will do for now, though |
| 658 | */ |
| 659 | namelen = dentry->d_name.len; |
| 660 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
| 661 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
| 662 | |
| 663 | if (ret) { |
| 664 | jffs2_free_raw_inode(ri); |
| 665 | return ret; |
| 666 | } |
| 667 | |
| 668 | inode = jffs2_new_inode(dir_i, mode, ri); |
| 669 | |
| 670 | if (IS_ERR(inode)) { |
| 671 | jffs2_free_raw_inode(ri); |
| 672 | jffs2_complete_reservation(c); |
| 673 | return PTR_ERR(inode); |
| 674 | } |
| 675 | inode->i_op = &jffs2_file_inode_operations; |
| 676 | init_special_inode(inode, inode->i_mode, rdev); |
| 677 | |
| 678 | f = JFFS2_INODE_INFO(inode); |
| 679 | |
| 680 | ri->dsize = ri->csize = cpu_to_je32(devlen); |
| 681 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); |
| 682 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
| 683 | |
| 684 | ri->compr = JFFS2_COMPR_NONE; |
| 685 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); |
| 686 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
| 687 | |
| 688 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
| 689 | |
| 690 | jffs2_free_raw_inode(ri); |
| 691 | |
| 692 | if (IS_ERR(fn)) { |
| 693 | /* Eeek. Wave bye bye */ |
| 694 | mutex_unlock(&f->sem); |
| 695 | jffs2_complete_reservation(c); |
| 696 | jffs2_clear_inode(inode); |
| 697 | return PTR_ERR(fn); |
| 698 | } |
| 699 | /* No data here. Only a metadata node, which will be |
| 700 | obsoleted by the first data write |
| 701 | */ |
| 702 | f->metadata = fn; |
| 703 | mutex_unlock(&f->sem); |
| 704 | |
| 705 | jffs2_complete_reservation(c); |
| 706 | |
| 707 | ret = jffs2_init_security(inode, dir_i); |
| 708 | if (ret) { |
| 709 | jffs2_clear_inode(inode); |
| 710 | return ret; |
| 711 | } |
| 712 | ret = jffs2_init_acl_post(inode); |
| 713 | if (ret) { |
| 714 | jffs2_clear_inode(inode); |
| 715 | return ret; |
| 716 | } |
| 717 | |
| 718 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
| 719 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
| 720 | if (ret) { |
| 721 | /* Eep. */ |
| 722 | jffs2_clear_inode(inode); |
| 723 | return ret; |
| 724 | } |
| 725 | |
| 726 | rd = jffs2_alloc_raw_dirent(); |
| 727 | if (!rd) { |
| 728 | /* Argh. Now we treat it like a normal delete */ |
| 729 | jffs2_complete_reservation(c); |
| 730 | jffs2_clear_inode(inode); |
| 731 | return -ENOMEM; |
| 732 | } |
| 733 | |
| 734 | dir_f = JFFS2_INODE_INFO(dir_i); |
| 735 | mutex_lock(&dir_f->sem); |
| 736 | |
| 737 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| 738 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); |
| 739 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); |
| 740 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); |
| 741 | |
| 742 | rd->pino = cpu_to_je32(dir_i->i_ino); |
| 743 | rd->version = cpu_to_je32(++dir_f->highest_version); |
| 744 | rd->ino = cpu_to_je32(inode->i_ino); |
| 745 | rd->mctime = cpu_to_je32(get_seconds()); |
| 746 | rd->nsize = namelen; |
| 747 | |
| 748 | /* XXX: This is ugly. */ |
| 749 | rd->type = (mode & S_IFMT) >> 12; |
| 750 | |
| 751 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
| 752 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); |
| 753 | |
| 754 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
| 755 | |
| 756 | if (IS_ERR(fd)) { |
| 757 | /* dirent failed to write. Delete the inode normally |
| 758 | as if it were the final unlink() */ |
| 759 | jffs2_complete_reservation(c); |
| 760 | jffs2_free_raw_dirent(rd); |
| 761 | mutex_unlock(&dir_f->sem); |
| 762 | jffs2_clear_inode(inode); |
| 763 | return PTR_ERR(fd); |
| 764 | } |
| 765 | |
| 766 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
| 767 | |
| 768 | jffs2_free_raw_dirent(rd); |
| 769 | |
| 770 | /* Link the fd into the inode's list, obsoleting an old |
| 771 | one if necessary. */ |
| 772 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); |
| 773 | |
| 774 | mutex_unlock(&dir_f->sem); |
| 775 | jffs2_complete_reservation(c); |
| 776 | |
| 777 | d_instantiate(dentry, inode); |
| 778 | |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, |
| 783 | struct inode *new_dir_i, struct dentry *new_dentry) |
| 784 | { |
| 785 | int ret; |
| 786 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); |
| 787 | struct jffs2_inode_info *victim_f = NULL; |
| 788 | uint8_t type; |
| 789 | uint32_t now; |
| 790 | |
| 791 | /* The VFS will check for us and prevent trying to rename a |
| 792 | * file over a directory and vice versa, but if it's a directory, |
| 793 | * the VFS can't check whether the victim is empty. The filesystem |
| 794 | * needs to do that for itself. |
| 795 | */ |
| 796 | if (new_dentry->d_inode) { |
| 797 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); |
| 798 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { |
| 799 | struct jffs2_full_dirent *fd; |
| 800 | |
| 801 | mutex_lock(&victim_f->sem); |
| 802 | for (fd = victim_f->dents; fd; fd = fd->next) { |
| 803 | if (fd->ino) { |
| 804 | mutex_unlock(&victim_f->sem); |
| 805 | return -ENOTEMPTY; |
| 806 | } |
| 807 | } |
| 808 | mutex_unlock(&victim_f->sem); |
| 809 | } |
| 810 | } |
| 811 | |
| 812 | /* XXX: We probably ought to alloc enough space for |
| 813 | both nodes at the same time. Writing the new link, |
| 814 | then getting -ENOSPC, is quite bad :) |
| 815 | */ |
| 816 | |
| 817 | /* Make a hard link */ |
| 818 | |
| 819 | /* XXX: This is ugly */ |
| 820 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; |
| 821 | if (!type) type = DT_REG; |
| 822 | |
| 823 | now = get_seconds(); |
| 824 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
| 825 | old_dentry->d_inode->i_ino, type, |
| 826 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
| 827 | |
| 828 | if (ret) |
| 829 | return ret; |
| 830 | |
| 831 | if (victim_f) { |
| 832 | /* There was a victim. Kill it off nicely */ |
| 833 | drop_nlink(new_dentry->d_inode); |
| 834 | /* Don't oops if the victim was a dirent pointing to an |
| 835 | inode which didn't exist. */ |
| 836 | if (victim_f->inocache) { |
| 837 | mutex_lock(&victim_f->sem); |
| 838 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
| 839 | victim_f->inocache->pino_nlink = 0; |
| 840 | else |
| 841 | victim_f->inocache->pino_nlink--; |
| 842 | mutex_unlock(&victim_f->sem); |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | /* If it was a directory we moved, and there was no victim, |
| 847 | increase i_nlink on its new parent */ |
| 848 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) |
| 849 | inc_nlink(new_dir_i); |
| 850 | |
| 851 | /* Unlink the original */ |
| 852 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
| 853 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
| 854 | |
| 855 | /* We don't touch inode->i_nlink */ |
| 856 | |
| 857 | if (ret) { |
| 858 | /* Oh shit. We really ought to make a single node which can do both atomically */ |
| 859 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); |
| 860 | mutex_lock(&f->sem); |
| 861 | inc_nlink(old_dentry->d_inode); |
| 862 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
| 863 | f->inocache->pino_nlink++; |
| 864 | mutex_unlock(&f->sem); |
| 865 | |
| 866 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); |
| 867 | /* Might as well let the VFS know */ |
| 868 | d_instantiate(new_dentry, old_dentry->d_inode); |
| 869 | atomic_inc(&old_dentry->d_inode->i_count); |
| 870 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
| 871 | return ret; |
| 872 | } |
| 873 | |
| 874 | if (S_ISDIR(old_dentry->d_inode->i_mode)) |
| 875 | drop_nlink(old_dir_i); |
| 876 | |
| 877 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
| 878 | |
| 879 | return 0; |
| 880 | } |
| 881 | |