| 1 | /* |
| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
| 3 | * |
| 4 | * Copyright © 2001-2007 Red Hat, Inc. |
| 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
| 6 | * |
| 7 | * Created by David Woodhouse <dwmw2@infradead.org> |
| 8 | * |
| 9 | * For licensing information, see the file 'LICENCE' in this directory. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
| 15 | #include <linux/capability.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/cred.h> |
| 19 | #include <linux/fs.h> |
| 20 | #include <linux/list.h> |
| 21 | #include <linux/mtd/mtd.h> |
| 22 | #include <linux/pagemap.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/vmalloc.h> |
| 25 | #include <linux/vfs.h> |
| 26 | #include <linux/crc32.h> |
| 27 | #include "nodelist.h" |
| 28 | |
| 29 | static int jffs2_flash_setup(struct jffs2_sb_info *c); |
| 30 | |
| 31 | int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
| 32 | { |
| 33 | struct jffs2_full_dnode *old_metadata, *new_metadata; |
| 34 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
| 35 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
| 36 | struct jffs2_raw_inode *ri; |
| 37 | union jffs2_device_node dev; |
| 38 | unsigned char *mdata = NULL; |
| 39 | int mdatalen = 0; |
| 40 | unsigned int ivalid; |
| 41 | uint32_t alloclen; |
| 42 | int ret; |
| 43 | int alloc_type = ALLOC_NORMAL; |
| 44 | |
| 45 | jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); |
| 46 | |
| 47 | /* Special cases - we don't want more than one data node |
| 48 | for these types on the medium at any time. So setattr |
| 49 | must read the original data associated with the node |
| 50 | (i.e. the device numbers or the target name) and write |
| 51 | it out again with the appropriate data attached */ |
| 52 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { |
| 53 | /* For these, we don't actually need to read the old node */ |
| 54 | mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
| 55 | mdata = (char *)&dev; |
| 56 | jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n", |
| 57 | __func__, mdatalen); |
| 58 | } else if (S_ISLNK(inode->i_mode)) { |
| 59 | mutex_lock(&f->sem); |
| 60 | mdatalen = f->metadata->size; |
| 61 | mdata = kmalloc(f->metadata->size, GFP_USER); |
| 62 | if (!mdata) { |
| 63 | mutex_unlock(&f->sem); |
| 64 | return -ENOMEM; |
| 65 | } |
| 66 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
| 67 | if (ret) { |
| 68 | mutex_unlock(&f->sem); |
| 69 | kfree(mdata); |
| 70 | return ret; |
| 71 | } |
| 72 | mutex_unlock(&f->sem); |
| 73 | jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", |
| 74 | __func__, mdatalen); |
| 75 | } |
| 76 | |
| 77 | ri = jffs2_alloc_raw_inode(); |
| 78 | if (!ri) { |
| 79 | if (S_ISLNK(inode->i_mode)) |
| 80 | kfree(mdata); |
| 81 | return -ENOMEM; |
| 82 | } |
| 83 | |
| 84 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
| 85 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
| 86 | if (ret) { |
| 87 | jffs2_free_raw_inode(ri); |
| 88 | if (S_ISLNK(inode->i_mode)) |
| 89 | kfree(mdata); |
| 90 | return ret; |
| 91 | } |
| 92 | mutex_lock(&f->sem); |
| 93 | ivalid = iattr->ia_valid; |
| 94 | |
| 95 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| 96 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); |
| 97 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); |
| 98 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
| 99 | |
| 100 | ri->ino = cpu_to_je32(inode->i_ino); |
| 101 | ri->version = cpu_to_je32(++f->highest_version); |
| 102 | |
| 103 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)? |
| 104 | from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); |
| 105 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)? |
| 106 | from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); |
| 107 | |
| 108 | if (ivalid & ATTR_MODE) |
| 109 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
| 110 | else |
| 111 | ri->mode = cpu_to_jemode(inode->i_mode); |
| 112 | |
| 113 | |
| 114 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); |
| 115 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); |
| 116 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); |
| 117 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); |
| 118 | |
| 119 | ri->offset = cpu_to_je32(0); |
| 120 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); |
| 121 | ri->compr = JFFS2_COMPR_NONE; |
| 122 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
| 123 | /* It's an extension. Make it a hole node */ |
| 124 | ri->compr = JFFS2_COMPR_ZERO; |
| 125 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); |
| 126 | ri->offset = cpu_to_je32(inode->i_size); |
| 127 | } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
| 128 | /* For truncate-to-zero, treat it as deletion because |
| 129 | it'll always be obsoleting all previous nodes */ |
| 130 | alloc_type = ALLOC_DELETION; |
| 131 | } |
| 132 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
| 133 | if (mdatalen) |
| 134 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); |
| 135 | else |
| 136 | ri->data_crc = cpu_to_je32(0); |
| 137 | |
| 138 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
| 139 | if (S_ISLNK(inode->i_mode)) |
| 140 | kfree(mdata); |
| 141 | |
| 142 | if (IS_ERR(new_metadata)) { |
| 143 | jffs2_complete_reservation(c); |
| 144 | jffs2_free_raw_inode(ri); |
| 145 | mutex_unlock(&f->sem); |
| 146 | return PTR_ERR(new_metadata); |
| 147 | } |
| 148 | /* It worked. Update the inode */ |
| 149 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); |
| 150 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); |
| 151 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); |
| 152 | inode->i_mode = jemode_to_cpu(ri->mode); |
| 153 | i_uid_write(inode, je16_to_cpu(ri->uid)); |
| 154 | i_gid_write(inode, je16_to_cpu(ri->gid)); |
| 155 | |
| 156 | |
| 157 | old_metadata = f->metadata; |
| 158 | |
| 159 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) |
| 160 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
| 161 | |
| 162 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
| 163 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); |
| 164 | inode->i_size = iattr->ia_size; |
| 165 | inode->i_blocks = (inode->i_size + 511) >> 9; |
| 166 | f->metadata = NULL; |
| 167 | } else { |
| 168 | f->metadata = new_metadata; |
| 169 | } |
| 170 | if (old_metadata) { |
| 171 | jffs2_mark_node_obsolete(c, old_metadata->raw); |
| 172 | jffs2_free_full_dnode(old_metadata); |
| 173 | } |
| 174 | jffs2_free_raw_inode(ri); |
| 175 | |
| 176 | mutex_unlock(&f->sem); |
| 177 | jffs2_complete_reservation(c); |
| 178 | |
| 179 | /* We have to do the truncate_setsize() without f->sem held, since |
| 180 | some pages may be locked and waiting for it in readpage(). |
| 181 | We are protected from a simultaneous write() extending i_size |
| 182 | back past iattr->ia_size, because do_truncate() holds the |
| 183 | generic inode semaphore. */ |
| 184 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
| 185 | truncate_setsize(inode, iattr->ia_size); |
| 186 | inode->i_blocks = (inode->i_size + 511) >> 9; |
| 187 | } |
| 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) |
| 193 | { |
| 194 | struct inode *inode = d_inode(dentry); |
| 195 | int rc; |
| 196 | |
| 197 | rc = setattr_prepare(dentry, iattr); |
| 198 | if (rc) |
| 199 | return rc; |
| 200 | |
| 201 | rc = jffs2_do_setattr(inode, iattr); |
| 202 | if (!rc && (iattr->ia_valid & ATTR_MODE)) |
| 203 | rc = posix_acl_chmod(inode, inode->i_mode); |
| 204 | |
| 205 | return rc; |
| 206 | } |
| 207 | |
| 208 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 209 | { |
| 210 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
| 211 | unsigned long avail; |
| 212 | |
| 213 | buf->f_type = JFFS2_SUPER_MAGIC; |
| 214 | buf->f_bsize = 1 << PAGE_SHIFT; |
| 215 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; |
| 216 | buf->f_files = 0; |
| 217 | buf->f_ffree = 0; |
| 218 | buf->f_namelen = JFFS2_MAX_NAME_LEN; |
| 219 | buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
| 220 | buf->f_fsid.val[1] = c->mtd->index; |
| 221 | |
| 222 | spin_lock(&c->erase_completion_lock); |
| 223 | avail = c->dirty_size + c->free_size; |
| 224 | if (avail > c->sector_size * c->resv_blocks_write) |
| 225 | avail -= c->sector_size * c->resv_blocks_write; |
| 226 | else |
| 227 | avail = 0; |
| 228 | spin_unlock(&c->erase_completion_lock); |
| 229 | |
| 230 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; |
| 231 | |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | |
| 236 | void jffs2_evict_inode (struct inode *inode) |
| 237 | { |
| 238 | /* We can forget about this inode for now - drop all |
| 239 | * the nodelists associated with it, etc. |
| 240 | */ |
| 241 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
| 242 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
| 243 | |
| 244 | jffs2_dbg(1, "%s(): ino #%lu mode %o\n", |
| 245 | __func__, inode->i_ino, inode->i_mode); |
| 246 | truncate_inode_pages_final(&inode->i_data); |
| 247 | clear_inode(inode); |
| 248 | jffs2_do_clear_inode(c, f); |
| 249 | } |
| 250 | |
| 251 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
| 252 | { |
| 253 | struct jffs2_inode_info *f; |
| 254 | struct jffs2_sb_info *c; |
| 255 | struct jffs2_raw_inode latest_node; |
| 256 | union jffs2_device_node jdev; |
| 257 | struct inode *inode; |
| 258 | dev_t rdev = 0; |
| 259 | int ret; |
| 260 | |
| 261 | jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); |
| 262 | |
| 263 | inode = iget_locked(sb, ino); |
| 264 | if (!inode) |
| 265 | return ERR_PTR(-ENOMEM); |
| 266 | if (!(inode->i_state & I_NEW)) |
| 267 | return inode; |
| 268 | |
| 269 | f = JFFS2_INODE_INFO(inode); |
| 270 | c = JFFS2_SB_INFO(inode->i_sb); |
| 271 | |
| 272 | jffs2_init_inode_info(f); |
| 273 | mutex_lock(&f->sem); |
| 274 | |
| 275 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
| 276 | if (ret) |
| 277 | goto error; |
| 278 | |
| 279 | inode->i_mode = jemode_to_cpu(latest_node.mode); |
| 280 | i_uid_write(inode, je16_to_cpu(latest_node.uid)); |
| 281 | i_gid_write(inode, je16_to_cpu(latest_node.gid)); |
| 282 | inode->i_size = je32_to_cpu(latest_node.isize); |
| 283 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); |
| 284 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); |
| 285 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); |
| 286 | |
| 287 | set_nlink(inode, f->inocache->pino_nlink); |
| 288 | |
| 289 | inode->i_blocks = (inode->i_size + 511) >> 9; |
| 290 | |
| 291 | switch (inode->i_mode & S_IFMT) { |
| 292 | |
| 293 | case S_IFLNK: |
| 294 | inode->i_op = &jffs2_symlink_inode_operations; |
| 295 | inode->i_link = f->target; |
| 296 | break; |
| 297 | |
| 298 | case S_IFDIR: |
| 299 | { |
| 300 | struct jffs2_full_dirent *fd; |
| 301 | set_nlink(inode, 2); /* parent and '.' */ |
| 302 | |
| 303 | for (fd=f->dents; fd; fd = fd->next) { |
| 304 | if (fd->type == DT_DIR && fd->ino) |
| 305 | inc_nlink(inode); |
| 306 | } |
| 307 | /* Root dir gets i_nlink 3 for some reason */ |
| 308 | if (inode->i_ino == 1) |
| 309 | inc_nlink(inode); |
| 310 | |
| 311 | inode->i_op = &jffs2_dir_inode_operations; |
| 312 | inode->i_fop = &jffs2_dir_operations; |
| 313 | break; |
| 314 | } |
| 315 | case S_IFREG: |
| 316 | inode->i_op = &jffs2_file_inode_operations; |
| 317 | inode->i_fop = &jffs2_file_operations; |
| 318 | inode->i_mapping->a_ops = &jffs2_file_address_operations; |
| 319 | inode->i_mapping->nrpages = 0; |
| 320 | break; |
| 321 | |
| 322 | case S_IFBLK: |
| 323 | case S_IFCHR: |
| 324 | /* Read the device numbers from the media */ |
| 325 | if (f->metadata->size != sizeof(jdev.old_id) && |
| 326 | f->metadata->size != sizeof(jdev.new_id)) { |
| 327 | pr_notice("Device node has strange size %d\n", |
| 328 | f->metadata->size); |
| 329 | goto error_io; |
| 330 | } |
| 331 | jffs2_dbg(1, "Reading device numbers from flash\n"); |
| 332 | ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
| 333 | if (ret < 0) { |
| 334 | /* Eep */ |
| 335 | pr_notice("Read device numbers for inode %lu failed\n", |
| 336 | (unsigned long)inode->i_ino); |
| 337 | goto error; |
| 338 | } |
| 339 | if (f->metadata->size == sizeof(jdev.old_id)) |
| 340 | rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); |
| 341 | else |
| 342 | rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
| 343 | |
| 344 | case S_IFSOCK: |
| 345 | case S_IFIFO: |
| 346 | inode->i_op = &jffs2_file_inode_operations; |
| 347 | init_special_inode(inode, inode->i_mode, rdev); |
| 348 | break; |
| 349 | |
| 350 | default: |
| 351 | pr_warn("%s(): Bogus i_mode %o for ino %lu\n", |
| 352 | __func__, inode->i_mode, (unsigned long)inode->i_ino); |
| 353 | } |
| 354 | |
| 355 | mutex_unlock(&f->sem); |
| 356 | |
| 357 | jffs2_dbg(1, "jffs2_read_inode() returning\n"); |
| 358 | unlock_new_inode(inode); |
| 359 | return inode; |
| 360 | |
| 361 | error_io: |
| 362 | ret = -EIO; |
| 363 | error: |
| 364 | mutex_unlock(&f->sem); |
| 365 | jffs2_do_clear_inode(c, f); |
| 366 | iget_failed(inode); |
| 367 | return ERR_PTR(ret); |
| 368 | } |
| 369 | |
| 370 | void jffs2_dirty_inode(struct inode *inode, int flags) |
| 371 | { |
| 372 | struct iattr iattr; |
| 373 | |
| 374 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { |
| 375 | jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", |
| 376 | __func__, inode->i_ino); |
| 377 | return; |
| 378 | } |
| 379 | |
| 380 | jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", |
| 381 | __func__, inode->i_ino); |
| 382 | |
| 383 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; |
| 384 | iattr.ia_mode = inode->i_mode; |
| 385 | iattr.ia_uid = inode->i_uid; |
| 386 | iattr.ia_gid = inode->i_gid; |
| 387 | iattr.ia_atime = inode->i_atime; |
| 388 | iattr.ia_mtime = inode->i_mtime; |
| 389 | iattr.ia_ctime = inode->i_ctime; |
| 390 | |
| 391 | jffs2_do_setattr(inode, &iattr); |
| 392 | } |
| 393 | |
| 394 | int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) |
| 395 | { |
| 396 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
| 397 | |
| 398 | if (c->flags & JFFS2_SB_FLAG_RO && !sb_rdonly(sb)) |
| 399 | return -EROFS; |
| 400 | |
| 401 | /* We stop if it was running, then restart if it needs to. |
| 402 | This also catches the case where it was stopped and this |
| 403 | is just a remount to restart it. |
| 404 | Flush the writebuffer, if neccecary, else we loose it */ |
| 405 | if (!sb_rdonly(sb)) { |
| 406 | jffs2_stop_garbage_collect_thread(c); |
| 407 | mutex_lock(&c->alloc_sem); |
| 408 | jffs2_flush_wbuf_pad(c); |
| 409 | mutex_unlock(&c->alloc_sem); |
| 410 | } |
| 411 | |
| 412 | if (!(*flags & SB_RDONLY)) |
| 413 | jffs2_start_garbage_collect_thread(c); |
| 414 | |
| 415 | *flags |= SB_NOATIME; |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
| 420 | fill in the raw_inode while you're at it. */ |
| 421 | struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
| 422 | { |
| 423 | struct inode *inode; |
| 424 | struct super_block *sb = dir_i->i_sb; |
| 425 | struct jffs2_sb_info *c; |
| 426 | struct jffs2_inode_info *f; |
| 427 | int ret; |
| 428 | |
| 429 | jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", |
| 430 | __func__, dir_i->i_ino, mode); |
| 431 | |
| 432 | c = JFFS2_SB_INFO(sb); |
| 433 | |
| 434 | inode = new_inode(sb); |
| 435 | |
| 436 | if (!inode) |
| 437 | return ERR_PTR(-ENOMEM); |
| 438 | |
| 439 | f = JFFS2_INODE_INFO(inode); |
| 440 | jffs2_init_inode_info(f); |
| 441 | mutex_lock(&f->sem); |
| 442 | |
| 443 | memset(ri, 0, sizeof(*ri)); |
| 444 | /* Set OS-specific defaults for new inodes */ |
| 445 | ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); |
| 446 | |
| 447 | if (dir_i->i_mode & S_ISGID) { |
| 448 | ri->gid = cpu_to_je16(i_gid_read(dir_i)); |
| 449 | if (S_ISDIR(mode)) |
| 450 | mode |= S_ISGID; |
| 451 | } else { |
| 452 | ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); |
| 453 | } |
| 454 | |
| 455 | /* POSIX ACLs have to be processed now, at least partly. |
| 456 | The umask is only applied if there's no default ACL */ |
| 457 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
| 458 | if (ret) { |
| 459 | mutex_unlock(&f->sem); |
| 460 | make_bad_inode(inode); |
| 461 | iput(inode); |
| 462 | return ERR_PTR(ret); |
| 463 | } |
| 464 | ret = jffs2_do_new_inode (c, f, mode, ri); |
| 465 | if (ret) { |
| 466 | mutex_unlock(&f->sem); |
| 467 | make_bad_inode(inode); |
| 468 | iput(inode); |
| 469 | return ERR_PTR(ret); |
| 470 | } |
| 471 | set_nlink(inode, 1); |
| 472 | inode->i_ino = je32_to_cpu(ri->ino); |
| 473 | inode->i_mode = jemode_to_cpu(ri->mode); |
| 474 | i_gid_write(inode, je16_to_cpu(ri->gid)); |
| 475 | i_uid_write(inode, je16_to_cpu(ri->uid)); |
| 476 | inode->i_atime = inode->i_ctime = inode->i_mtime = current_time(inode); |
| 477 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); |
| 478 | |
| 479 | inode->i_blocks = 0; |
| 480 | inode->i_size = 0; |
| 481 | |
| 482 | if (insert_inode_locked(inode) < 0) { |
| 483 | mutex_unlock(&f->sem); |
| 484 | make_bad_inode(inode); |
| 485 | iput(inode); |
| 486 | return ERR_PTR(-EINVAL); |
| 487 | } |
| 488 | |
| 489 | return inode; |
| 490 | } |
| 491 | |
| 492 | static int calculate_inocache_hashsize(uint32_t flash_size) |
| 493 | { |
| 494 | /* |
| 495 | * Pick a inocache hash size based on the size of the medium. |
| 496 | * Count how many megabytes we're dealing with, apply a hashsize twice |
| 497 | * that size, but rounding down to the usual big powers of 2. And keep |
| 498 | * to sensible bounds. |
| 499 | */ |
| 500 | |
| 501 | int size_mb = flash_size / 1024 / 1024; |
| 502 | int hashsize = (size_mb * 2) & ~0x3f; |
| 503 | |
| 504 | if (hashsize < INOCACHE_HASHSIZE_MIN) |
| 505 | return INOCACHE_HASHSIZE_MIN; |
| 506 | if (hashsize > INOCACHE_HASHSIZE_MAX) |
| 507 | return INOCACHE_HASHSIZE_MAX; |
| 508 | |
| 509 | return hashsize; |
| 510 | } |
| 511 | |
| 512 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) |
| 513 | { |
| 514 | struct jffs2_sb_info *c; |
| 515 | struct inode *root_i; |
| 516 | int ret; |
| 517 | size_t blocks; |
| 518 | |
| 519 | c = JFFS2_SB_INFO(sb); |
| 520 | |
| 521 | /* Do not support the MLC nand */ |
| 522 | if (c->mtd->type == MTD_MLCNANDFLASH) |
| 523 | return -EINVAL; |
| 524 | |
| 525 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
| 526 | if (c->mtd->type == MTD_NANDFLASH) { |
| 527 | pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n"); |
| 528 | return -EINVAL; |
| 529 | } |
| 530 | if (c->mtd->type == MTD_DATAFLASH) { |
| 531 | pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n"); |
| 532 | return -EINVAL; |
| 533 | } |
| 534 | #endif |
| 535 | |
| 536 | c->flash_size = c->mtd->size; |
| 537 | c->sector_size = c->mtd->erasesize; |
| 538 | blocks = c->flash_size / c->sector_size; |
| 539 | |
| 540 | /* |
| 541 | * Size alignment check |
| 542 | */ |
| 543 | if ((c->sector_size * blocks) != c->flash_size) { |
| 544 | c->flash_size = c->sector_size * blocks; |
| 545 | pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n", |
| 546 | c->flash_size / 1024); |
| 547 | } |
| 548 | |
| 549 | if (c->flash_size < 5*c->sector_size) { |
| 550 | pr_err("Too few erase blocks (%d)\n", |
| 551 | c->flash_size / c->sector_size); |
| 552 | return -EINVAL; |
| 553 | } |
| 554 | |
| 555 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); |
| 556 | |
| 557 | /* NAND (or other bizarre) flash... do setup accordingly */ |
| 558 | ret = jffs2_flash_setup(c); |
| 559 | if (ret) |
| 560 | return ret; |
| 561 | |
| 562 | c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); |
| 563 | c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
| 564 | if (!c->inocache_list) { |
| 565 | ret = -ENOMEM; |
| 566 | goto out_wbuf; |
| 567 | } |
| 568 | |
| 569 | jffs2_init_xattr_subsystem(c); |
| 570 | |
| 571 | if ((ret = jffs2_do_mount_fs(c))) |
| 572 | goto out_inohash; |
| 573 | |
| 574 | jffs2_dbg(1, "%s(): Getting root inode\n", __func__); |
| 575 | root_i = jffs2_iget(sb, 1); |
| 576 | if (IS_ERR(root_i)) { |
| 577 | jffs2_dbg(1, "get root inode failed\n"); |
| 578 | ret = PTR_ERR(root_i); |
| 579 | goto out_root; |
| 580 | } |
| 581 | |
| 582 | ret = -ENOMEM; |
| 583 | |
| 584 | jffs2_dbg(1, "%s(): d_make_root()\n", __func__); |
| 585 | sb->s_root = d_make_root(root_i); |
| 586 | if (!sb->s_root) |
| 587 | goto out_root; |
| 588 | |
| 589 | sb->s_maxbytes = 0xFFFFFFFF; |
| 590 | sb->s_blocksize = PAGE_SIZE; |
| 591 | sb->s_blocksize_bits = PAGE_SHIFT; |
| 592 | sb->s_magic = JFFS2_SUPER_MAGIC; |
| 593 | if (!sb_rdonly(sb)) |
| 594 | jffs2_start_garbage_collect_thread(c); |
| 595 | return 0; |
| 596 | |
| 597 | out_root: |
| 598 | jffs2_free_ino_caches(c); |
| 599 | jffs2_free_raw_node_refs(c); |
| 600 | kvfree(c->blocks); |
| 601 | out_inohash: |
| 602 | jffs2_clear_xattr_subsystem(c); |
| 603 | kfree(c->inocache_list); |
| 604 | out_wbuf: |
| 605 | jffs2_flash_cleanup(c); |
| 606 | |
| 607 | return ret; |
| 608 | } |
| 609 | |
| 610 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, |
| 611 | struct jffs2_inode_info *f) |
| 612 | { |
| 613 | iput(OFNI_EDONI_2SFFJ(f)); |
| 614 | } |
| 615 | |
| 616 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, |
| 617 | int inum, int unlinked) |
| 618 | { |
| 619 | struct inode *inode; |
| 620 | struct jffs2_inode_cache *ic; |
| 621 | |
| 622 | if (unlinked) { |
| 623 | /* The inode has zero nlink but its nodes weren't yet marked |
| 624 | obsolete. This has to be because we're still waiting for |
| 625 | the final (close() and) iput() to happen. |
| 626 | |
| 627 | There's a possibility that the final iput() could have |
| 628 | happened while we were contemplating. In order to ensure |
| 629 | that we don't cause a new read_inode() (which would fail) |
| 630 | for the inode in question, we use ilookup() in this case |
| 631 | instead of iget(). |
| 632 | |
| 633 | The nlink can't _become_ zero at this point because we're |
| 634 | holding the alloc_sem, and jffs2_do_unlink() would also |
| 635 | need that while decrementing nlink on any inode. |
| 636 | */ |
| 637 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); |
| 638 | if (!inode) { |
| 639 | jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", |
| 640 | inum); |
| 641 | |
| 642 | spin_lock(&c->inocache_lock); |
| 643 | ic = jffs2_get_ino_cache(c, inum); |
| 644 | if (!ic) { |
| 645 | jffs2_dbg(1, "Inode cache for ino #%u is gone\n", |
| 646 | inum); |
| 647 | spin_unlock(&c->inocache_lock); |
| 648 | return NULL; |
| 649 | } |
| 650 | if (ic->state != INO_STATE_CHECKEDABSENT) { |
| 651 | /* Wait for progress. Don't just loop */ |
| 652 | jffs2_dbg(1, "Waiting for ino #%u in state %d\n", |
| 653 | ic->ino, ic->state); |
| 654 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
| 655 | } else { |
| 656 | spin_unlock(&c->inocache_lock); |
| 657 | } |
| 658 | |
| 659 | return NULL; |
| 660 | } |
| 661 | } else { |
| 662 | /* Inode has links to it still; they're not going away because |
| 663 | jffs2_do_unlink() would need the alloc_sem and we have it. |
| 664 | Just iget() it, and if read_inode() is necessary that's OK. |
| 665 | */ |
| 666 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
| 667 | if (IS_ERR(inode)) |
| 668 | return ERR_CAST(inode); |
| 669 | } |
| 670 | if (is_bad_inode(inode)) { |
| 671 | pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", |
| 672 | inum, unlinked); |
| 673 | /* NB. This will happen again. We need to do something appropriate here. */ |
| 674 | iput(inode); |
| 675 | return ERR_PTR(-EIO); |
| 676 | } |
| 677 | |
| 678 | return JFFS2_INODE_INFO(inode); |
| 679 | } |
| 680 | |
| 681 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
| 682 | struct jffs2_inode_info *f, |
| 683 | unsigned long offset, |
| 684 | unsigned long *priv) |
| 685 | { |
| 686 | struct inode *inode = OFNI_EDONI_2SFFJ(f); |
| 687 | struct page *pg; |
| 688 | |
| 689 | pg = read_cache_page(inode->i_mapping, offset >> PAGE_SHIFT, |
| 690 | (void *)jffs2_do_readpage_unlock, inode); |
| 691 | if (IS_ERR(pg)) |
| 692 | return (void *)pg; |
| 693 | |
| 694 | *priv = (unsigned long)pg; |
| 695 | return kmap(pg); |
| 696 | } |
| 697 | |
| 698 | void jffs2_gc_release_page(struct jffs2_sb_info *c, |
| 699 | unsigned char *ptr, |
| 700 | unsigned long *priv) |
| 701 | { |
| 702 | struct page *pg = (void *)*priv; |
| 703 | |
| 704 | kunmap(pg); |
| 705 | put_page(pg); |
| 706 | } |
| 707 | |
| 708 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { |
| 709 | int ret = 0; |
| 710 | |
| 711 | if (jffs2_cleanmarker_oob(c)) { |
| 712 | /* NAND flash... do setup accordingly */ |
| 713 | ret = jffs2_nand_flash_setup(c); |
| 714 | if (ret) |
| 715 | return ret; |
| 716 | } |
| 717 | |
| 718 | /* and Dataflash */ |
| 719 | if (jffs2_dataflash(c)) { |
| 720 | ret = jffs2_dataflash_setup(c); |
| 721 | if (ret) |
| 722 | return ret; |
| 723 | } |
| 724 | |
| 725 | /* and Intel "Sibley" flash */ |
| 726 | if (jffs2_nor_wbuf_flash(c)) { |
| 727 | ret = jffs2_nor_wbuf_flash_setup(c); |
| 728 | if (ret) |
| 729 | return ret; |
| 730 | } |
| 731 | |
| 732 | /* and an UBI volume */ |
| 733 | if (jffs2_ubivol(c)) { |
| 734 | ret = jffs2_ubivol_setup(c); |
| 735 | if (ret) |
| 736 | return ret; |
| 737 | } |
| 738 | |
| 739 | return ret; |
| 740 | } |
| 741 | |
| 742 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { |
| 743 | |
| 744 | if (jffs2_cleanmarker_oob(c)) { |
| 745 | jffs2_nand_flash_cleanup(c); |
| 746 | } |
| 747 | |
| 748 | /* and DataFlash */ |
| 749 | if (jffs2_dataflash(c)) { |
| 750 | jffs2_dataflash_cleanup(c); |
| 751 | } |
| 752 | |
| 753 | /* and Intel "Sibley" flash */ |
| 754 | if (jffs2_nor_wbuf_flash(c)) { |
| 755 | jffs2_nor_wbuf_flash_cleanup(c); |
| 756 | } |
| 757 | |
| 758 | /* and an UBI volume */ |
| 759 | if (jffs2_ubivol(c)) { |
| 760 | jffs2_ubivol_cleanup(c); |
| 761 | } |
| 762 | } |