fs/jffs2/fs.c

   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 #include <linux/capability.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/fs.h>
  17 #include <linux/list.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/pagemap.h>
  20 #include <linux/slab.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/vfs.h>
  23 #include <linux/crc32.h>
  24 #include "nodelist.h"
  25
  26 static int jffs2_flash_setup(struct jffs2_sb_info *c);
  27
  28 int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
  29 {
  30         struct jffs2_full_dnode *old_metadata, *new_metadata;
  31         struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
  32         struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
  33         struct jffs2_raw_inode *ri;
  34         union jffs2_device_node dev;
  35         unsigned char *mdata = NULL;
  36         int mdatalen = 0;
  37         unsigned int ivalid;
  38         uint32_t alloclen;
  39         int ret;
  40         int alloc_type = ALLOC_NORMAL;
  41
  42         D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino));
  43
  44         /* Special cases - we don't want more than one data node
  45            for these types on the medium at any time. So setattr
  46            must read the original data associated with the node
  47            (i.e. the device numbers or the target name) and write
  48            it out again with the appropriate data attached */
  49         if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
  50                 /* For these, we don't actually need to read the old node */
  51                 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
  52                 mdata = (char *)&dev;
  53                 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
  54         } else if (S_ISLNK(inode->i_mode)) {
  55                 mutex_lock(&f->sem);
  56                 mdatalen = f->metadata->size;
  57                 mdata = kmalloc(f->metadata->size, GFP_USER);
  58                 if (!mdata) {
  59                         mutex_unlock(&f->sem);
  60                         return -ENOMEM;
  61                 }
  62                 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
  63                 if (ret) {
  64                         mutex_unlock(&f->sem);
  65                         kfree(mdata);
  66                         return ret;
  67                 }
  68                 mutex_unlock(&f->sem);
  69                 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen));
  70         }
  71
  72         ri = jffs2_alloc_raw_inode();
  73         if (!ri) {
  74                 if (S_ISLNK(inode->i_mode))
  75                         kfree(mdata);
  76                 return -ENOMEM;
  77         }
  78
  79         ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
  80                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
  81         if (ret) {
  82                 jffs2_free_raw_inode(ri);
  83                 if (S_ISLNK(inode->i_mode & S_IFMT))
  84                          kfree(mdata);
  85                 return ret;
  86         }
  87         mutex_lock(&f->sem);
  88         ivalid = iattr->ia_valid;
  89
  90         ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
  91         ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
  92         ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
  93         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
  94
  95         ri->ino = cpu_to_je32(inode->i_ino);
  96         ri->version = cpu_to_je32(++f->highest_version);
  97
  98         ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid);
  99         ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid);
 100
 101         if (ivalid & ATTR_MODE)
 102                 ri->mode = cpu_to_jemode(iattr->ia_mode);
 103         else
 104                 ri->mode = cpu_to_jemode(inode->i_mode);
 105
 106
 107         ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
 108         ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
 109         ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
 110         ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));
 111
 112         ri->offset = cpu_to_je32(0);
 113         ri->csize = ri->dsize = cpu_to_je32(mdatalen);
 114         ri->compr = JFFS2_COMPR_NONE;
 115         if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
 116                 /* It's an extension. Make it a hole node */
 117                 ri->compr = JFFS2_COMPR_ZERO;
 118                 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
 119                 ri->offset = cpu_to_je32(inode->i_size);
 120         } else if (ivalid & ATTR_SIZE && !iattr->ia_size) {
 121                 /* For truncate-to-zero, treat it as deletion because
 122                    it'll always be obsoleting all previous nodes */
 123                 alloc_type = ALLOC_DELETION;
 124         }
 125         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 126         if (mdatalen)
 127                 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
 128         else
 129                 ri->data_crc = cpu_to_je32(0);
 130
 131         new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type);
 132         if (S_ISLNK(inode->i_mode))
 133                 kfree(mdata);
 134
 135         if (IS_ERR(new_metadata)) {
 136                 jffs2_complete_reservation(c);
 137                 jffs2_free_raw_inode(ri);
 138                 mutex_unlock(&f->sem);
 139                 return PTR_ERR(new_metadata);
 140         }
 141         /* It worked. Update the inode */
 142         inode->i_atime = ITIME(je32_to_cpu(ri->atime));
 143         inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 144         inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
 145         inode->i_mode = jemode_to_cpu(ri->mode);
 146         inode->i_uid = je16_to_cpu(ri->uid);
 147         inode->i_gid = je16_to_cpu(ri->gid);
 148
 149
 150         old_metadata = f->metadata;
 151
 152         if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
 153                 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);
 154
 155         if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
 156                 jffs2_add_full_dnode_to_inode(c, f, new_metadata);
 157                 inode->i_size = iattr->ia_size;
 158                 inode->i_blocks = (inode->i_size + 511) >> 9;
 159                 f->metadata = NULL;
 160         } else {
 161                 f->metadata = new_metadata;
 162         }
 163         if (old_metadata) {
 164                 jffs2_mark_node_obsolete(c, old_metadata->raw);
 165                 jffs2_free_full_dnode(old_metadata);
 166         }
 167         jffs2_free_raw_inode(ri);
 168
 169         mutex_unlock(&f->sem);
 170         jffs2_complete_reservation(c);
 171
 172         /* We have to do the truncate_setsize() without f->sem held, since
 173            some pages may be locked and waiting for it in readpage().
 174            We are protected from a simultaneous write() extending i_size
 175            back past iattr->ia_size, because do_truncate() holds the
 176            generic inode semaphore. */
 177         if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
 178                 truncate_setsize(inode, iattr->ia_size);
 179                 inode->i_blocks = (inode->i_size + 511) >> 9;
 180         }
 181
 182         return 0;
 183 }
 184
 185 int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
 186 {
 187         int rc;
 188
 189         rc = inode_change_ok(dentry->d_inode, iattr);
 190         if (rc)
 191                 return rc;
 192
 193         rc = jffs2_do_setattr(dentry->d_inode, iattr);
 194         if (!rc && (iattr->ia_valid & ATTR_MODE))
 195                 rc = jffs2_acl_chmod(dentry->d_inode);
 196
 197         return rc;
 198 }
 199
 200 int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 201 {
 202         struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
 203         unsigned long avail;
 204
 205         buf->f_type = JFFS2_SUPER_MAGIC;
 206         buf->f_bsize = 1 << PAGE_SHIFT;
 207         buf->f_blocks = c->flash_size >> PAGE_SHIFT;
 208         buf->f_files = 0;
 209         buf->f_ffree = 0;
 210         buf->f_namelen = JFFS2_MAX_NAME_LEN;
 211         buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC;
 212         buf->f_fsid.val[1] = c->mtd->index;
 213
 214         spin_lock(&c->erase_completion_lock);
 215         avail = c->dirty_size + c->free_size;
 216         if (avail > c->sector_size * c->resv_blocks_write)
 217                 avail -= c->sector_size * c->resv_blocks_write;
 218         else
 219                 avail = 0;
 220         spin_unlock(&c->erase_completion_lock);
 221
 222         buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
 223
 224         return 0;
 225 }
 226
 227
 228 void jffs2_evict_inode (struct inode *inode)
 229 {
 230         /* We can forget about this inode for now - drop all
 231          *  the nodelists associated with it, etc.
 232          */
 233         struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
 234         struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
 235
 236         D1(printk(KERN_DEBUG "jffs2_evict_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode));
 237         truncate_inode_pages(&inode->i_data, 0);
 238         end_writeback(inode);
 239         jffs2_do_clear_inode(c, f);
 240 }
 241
 242 struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
 243 {
 244         struct jffs2_inode_info *f;
 245         struct jffs2_sb_info *c;
 246         struct jffs2_raw_inode latest_node;
 247         union jffs2_device_node jdev;
 248         struct inode *inode;
 249         dev_t rdev = 0;
 250         int ret;
 251
 252         D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino));
 253
 254         inode = iget_locked(sb, ino);
 255         if (!inode)
 256                 return ERR_PTR(-ENOMEM);
 257         if (!(inode->i_state & I_NEW))
 258                 return inode;
 259
 260         f = JFFS2_INODE_INFO(inode);
 261         c = JFFS2_SB_INFO(inode->i_sb);
 262
 263         jffs2_init_inode_info(f);
 264         mutex_lock(&f->sem);
 265
 266         ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
 267
 268         if (ret) {
 269                 mutex_unlock(&f->sem);
 270                 iget_failed(inode);
 271                 return ERR_PTR(ret);
 272         }
 273         inode->i_mode = jemode_to_cpu(latest_node.mode);
 274         inode->i_uid = je16_to_cpu(latest_node.uid);
 275         inode->i_gid = je16_to_cpu(latest_node.gid);
 276         inode->i_size = je32_to_cpu(latest_node.isize);
 277         inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
 278         inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
 279         inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
 280
 281         inode->i_nlink = f->inocache->pino_nlink;
 282
 283         inode->i_blocks = (inode->i_size + 511) >> 9;
 284
 285         switch (inode->i_mode & S_IFMT) {
 286
 287         case S_IFLNK:
 288                 inode->i_op = &jffs2_symlink_inode_operations;
 289                 break;
 290
 291         case S_IFDIR:
 292         {
 293                 struct jffs2_full_dirent *fd;
 294                 inode->i_nlink = 2; /* parent and '.' */
 295
 296                 for (fd=f->dents; fd; fd = fd->next) {
 297                         if (fd->type == DT_DIR && fd->ino)
 298                                 inc_nlink(inode);
 299                 }
 300                 /* Root dir gets i_nlink 3 for some reason */
 301                 if (inode->i_ino == 1)
 302                         inc_nlink(inode);
 303
 304                 inode->i_op = &jffs2_dir_inode_operations;
 305                 inode->i_fop = &jffs2_dir_operations;
 306                 break;
 307         }
 308         case S_IFREG:
 309                 inode->i_op = &jffs2_file_inode_operations;
 310                 inode->i_fop = &jffs2_file_operations;
 311                 inode->i_mapping->a_ops = &jffs2_file_address_operations;
 312                 inode->i_mapping->nrpages = 0;
 313                 break;
 314
 315         case S_IFBLK:
 316         case S_IFCHR:
 317                 /* Read the device numbers from the media */
 318                 if (f->metadata->size != sizeof(jdev.old_id) &&
 319                     f->metadata->size != sizeof(jdev.new_id)) {
 320                         printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size);
 321                         goto error_io;
 322                 }
 323                 D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
 324                 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
 325                 if (ret < 0) {
 326                         /* Eep */
 327                         printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
 328                         goto error;
 329                 }
 330                 if (f->metadata->size == sizeof(jdev.old_id))
 331                         rdev = old_decode_dev(je16_to_cpu(jdev.old_id));
 332                 else
 333                         rdev = new_decode_dev(je32_to_cpu(jdev.new_id));
 334
 335         case S_IFSOCK:
 336         case S_IFIFO:
 337                 inode->i_op = &jffs2_file_inode_operations;
 338                 init_special_inode(inode, inode->i_mode, rdev);
 339                 break;
 340
 341         default:
 342                 printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino);
 343         }
 344
 345         mutex_unlock(&f->sem);
 346
 347         D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
 348         unlock_new_inode(inode);
 349         return inode;
 350
 351 error_io:
 352         ret = -EIO;
 353 error:
 354         mutex_unlock(&f->sem);
 355         jffs2_do_clear_inode(c, f);
 356         iget_failed(inode);
 357         return ERR_PTR(ret);
 358 }
 359
 360 void jffs2_dirty_inode(struct inode *inode)
 361 {
 362         struct iattr iattr;
 363
 364         if (!(inode->i_state & I_DIRTY_DATASYNC)) {
 365                 D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino));
 366                 return;
 367         }
 368
 369         D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino));
 370
 371         iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
 372         iattr.ia_mode = inode->i_mode;
 373         iattr.ia_uid = inode->i_uid;
 374         iattr.ia_gid = inode->i_gid;
 375         iattr.ia_atime = inode->i_atime;
 376         iattr.ia_mtime = inode->i_mtime;
 377         iattr.ia_ctime = inode->i_ctime;
 378
 379         jffs2_do_setattr(inode, &iattr);
 380 }
 381
 382 int jffs2_remount_fs (struct super_block *sb, int *flags, char *data)
 383 {
 384         struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
 385
 386         if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
 387                 return -EROFS;
 388
 389         /* We stop if it was running, then restart if it needs to.
 390            This also catches the case where it was stopped and this
 391            is just a remount to restart it.
 392            Flush the writebuffer, if neccecary, else we loose it */
 393         if (!(sb->s_flags & MS_RDONLY)) {
 394                 jffs2_stop_garbage_collect_thread(c);
 395                 mutex_lock(&c->alloc_sem);
 396                 jffs2_flush_wbuf_pad(c);
 397                 mutex_unlock(&c->alloc_sem);
 398         }
 399
 400         if (!(*flags & MS_RDONLY))
 401                 jffs2_start_garbage_collect_thread(c);
 402
 403         *flags |= MS_NOATIME;
 404         return 0;
 405 }
 406
 407 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
 408    fill in the raw_inode while you're at it. */
 409 struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri)
 410 {
 411         struct inode *inode;
 412         struct super_block *sb = dir_i->i_sb;
 413         struct jffs2_sb_info *c;
 414         struct jffs2_inode_info *f;
 415         int ret;
 416
 417         D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode));
 418
 419         c = JFFS2_SB_INFO(sb);
 420
 421         inode = new_inode(sb);
 422
 423         if (!inode)
 424                 return ERR_PTR(-ENOMEM);
 425
 426         f = JFFS2_INODE_INFO(inode);
 427         jffs2_init_inode_info(f);
 428         mutex_lock(&f->sem);
 429
 430         memset(ri, 0, sizeof(*ri));
 431         /* Set OS-specific defaults for new inodes */
 432         ri->uid = cpu_to_je16(current_fsuid());
 433
 434         if (dir_i->i_mode & S_ISGID) {
 435                 ri->gid = cpu_to_je16(dir_i->i_gid);
 436                 if (S_ISDIR(mode))
 437                         mode |= S_ISGID;
 438         } else {
 439                 ri->gid = cpu_to_je16(current_fsgid());
 440         }
 441
 442         /* POSIX ACLs have to be processed now, at least partly.
 443            The umask is only applied if there's no default ACL */
 444         ret = jffs2_init_acl_pre(dir_i, inode, &mode);
 445         if (ret) {
 446             make_bad_inode(inode);
 447             iput(inode);
 448             return ERR_PTR(ret);
 449         }
 450         ret = jffs2_do_new_inode (c, f, mode, ri);
 451         if (ret) {
 452                 make_bad_inode(inode);
 453                 iput(inode);
 454                 return ERR_PTR(ret);
 455         }
 456         inode->i_nlink = 1;
 457         inode->i_ino = je32_to_cpu(ri->ino);
 458         inode->i_mode = jemode_to_cpu(ri->mode);
 459         inode->i_gid = je16_to_cpu(ri->gid);
 460         inode->i_uid = je16_to_cpu(ri->uid);
 461         inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
 462         ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));
 463
 464         inode->i_blocks = 0;
 465         inode->i_size = 0;
 466
 467         if (insert_inode_locked(inode) < 0) {
 468                 make_bad_inode(inode);
 469                 unlock_new_inode(inode);
 470                 iput(inode);
 471                 return ERR_PTR(-EINVAL);
 472         }
 473
 474         return inode;
 475 }
 476
 477 static int calculate_inocache_hashsize(uint32_t flash_size)
 478 {
 479         /*
 480          * Pick a inocache hash size based on the size of the medium.
 481          * Count how many megabytes we're dealing with, apply a hashsize twice
 482          * that size, but rounding down to the usual big powers of 2. And keep
 483          * to sensible bounds.
 484          */
 485
 486         int size_mb = flash_size / 1024 / 1024;
 487         int hashsize = (size_mb * 2) & ~0x3f;
 488
 489         if (hashsize < INOCACHE_HASHSIZE_MIN)
 490                 return INOCACHE_HASHSIZE_MIN;
 491         if (hashsize > INOCACHE_HASHSIZE_MAX)
 492                 return INOCACHE_HASHSIZE_MAX;
 493
 494         return hashsize;
 495 }
 496
 497 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
 498 {
 499         struct jffs2_sb_info *c;
 500         struct inode *root_i;
 501         int ret;
 502         size_t blocks;
 503
 504         c = JFFS2_SB_INFO(sb);
 505
 506 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER
 507         if (c->mtd->type == MTD_NANDFLASH) {
 508                 printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n");
 509                 return -EINVAL;
 510         }
 511         if (c->mtd->type == MTD_DATAFLASH) {
 512                 printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n");
 513                 return -EINVAL;
 514         }
 515 #endif
 516
 517         c->flash_size = c->mtd->size;
 518         c->sector_size = c->mtd->erasesize;
 519         blocks = c->flash_size / c->sector_size;
 520
 521         /*
 522          * Size alignment check
 523          */
 524         if ((c->sector_size * blocks) != c->flash_size) {
 525                 c->flash_size = c->sector_size * blocks;
 526                 printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n",
 527                         c->flash_size / 1024);
 528         }
 529
 530         if (c->flash_size < 5*c->sector_size) {
 531                 printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size);
 532                 return -EINVAL;
 533         }
 534
 535         c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
 536
 537         /* NAND (or other bizarre) flash... do setup accordingly */
 538         ret = jffs2_flash_setup(c);
 539         if (ret)
 540                 return ret;
 541
 542         c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size);
 543         c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
 544         if (!c->inocache_list) {
 545                 ret = -ENOMEM;
 546                 goto out_wbuf;
 547         }
 548
 549         jffs2_init_xattr_subsystem(c);
 550
 551         if ((ret = jffs2_do_mount_fs(c)))
 552                 goto out_inohash;
 553
 554         D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
 555         root_i = jffs2_iget(sb, 1);
 556         if (IS_ERR(root_i)) {
 557                 D1(printk(KERN_WARNING "get root inode failed\n"));
 558                 ret = PTR_ERR(root_i);
 559                 goto out_root;
 560         }
 561
 562         ret = -ENOMEM;
 563
 564         D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
 565         sb->s_root = d_alloc_root(root_i);
 566         if (!sb->s_root)
 567                 goto out_root_i;
 568
 569         sb->s_maxbytes = 0xFFFFFFFF;
 570         sb->s_blocksize = PAGE_CACHE_SIZE;
 571         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 572         sb->s_magic = JFFS2_SUPER_MAGIC;
 573         if (!(sb->s_flags & MS_RDONLY))
 574                 jffs2_start_garbage_collect_thread(c);
 575         return 0;
 576
 577  out_root_i:
 578         iput(root_i);
 579 out_root:
 580         jffs2_free_ino_caches(c);
 581         jffs2_free_raw_node_refs(c);
 582         if (jffs2_blocks_use_vmalloc(c))
 583                 vfree(c->blocks);
 584         else
 585                 kfree(c->blocks);
 586  out_inohash:
 587         jffs2_clear_xattr_subsystem(c);
 588         kfree(c->inocache_list);
 589  out_wbuf:
 590         jffs2_flash_cleanup(c);
 591
 592         return ret;
 593 }
 594
 595 void jffs2_gc_release_inode(struct jffs2_sb_info *c,
 596                                    struct jffs2_inode_info *f)
 597 {
 598         iput(OFNI_EDONI_2SFFJ(f));
 599 }
 600
 601 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
 602                                               int inum, int unlinked)
 603 {
 604         struct inode *inode;
 605         struct jffs2_inode_cache *ic;
 606
 607         if (unlinked) {
 608                 /* The inode has zero nlink but its nodes weren't yet marked
 609                    obsolete. This has to be because we're still waiting for
 610                    the final (close() and) iput() to happen.
 611
 612                    There's a possibility that the final iput() could have
 613                    happened while we were contemplating. In order to ensure
 614                    that we don't cause a new read_inode() (which would fail)
 615                    for the inode in question, we use ilookup() in this case
 616                    instead of iget().
 617
 618                    The nlink can't _become_ zero at this point because we're
 619                    holding the alloc_sem, and jffs2_do_unlink() would also
 620                    need that while decrementing nlink on any inode.
 621                 */
 622                 inode = ilookup(OFNI_BS_2SFFJ(c), inum);
 623                 if (!inode) {
 624                         D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n",
 625                                   inum));
 626
 627                         spin_lock(&c->inocache_lock);
 628                         ic = jffs2_get_ino_cache(c, inum);
 629                         if (!ic) {
 630                                 D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum));
 631                                 spin_unlock(&c->inocache_lock);
 632                                 return NULL;
 633                         }
 634                         if (ic->state != INO_STATE_CHECKEDABSENT) {
 635                                 /* Wait for progress. Don't just loop */
 636                                 D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n",
 637                                           ic->ino, ic->state));
 638                                 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
 639                         } else {
 640                                 spin_unlock(&c->inocache_lock);
 641                         }
 642
 643                         return NULL;
 644                 }
 645         } else {
 646                 /* Inode has links to it still; they're not going away because
 647                    jffs2_do_unlink() would need the alloc_sem and we have it.
 648                    Just iget() it, and if read_inode() is necessary that's OK.
 649                 */
 650                 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
 651                 if (IS_ERR(inode))
 652                         return ERR_CAST(inode);
 653         }
 654         if (is_bad_inode(inode)) {
 655                 printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. unlinked %d\n",
 656                        inum, unlinked);
 657                 /* NB. This will happen again. We need to do something appropriate here. */
 658                 iput(inode);
 659                 return ERR_PTR(-EIO);
 660         }
 661
 662         return JFFS2_INODE_INFO(inode);
 663 }
 664
 665 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
 666                                    struct jffs2_inode_info *f,
 667                                    unsigned long offset,
 668                                    unsigned long *priv)
 669 {
 670         struct inode *inode = OFNI_EDONI_2SFFJ(f);
 671         struct page *pg;
 672
 673         pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
 674                              (void *)jffs2_do_readpage_unlock, inode);
 675         if (IS_ERR(pg))
 676                 return (void *)pg;
 677
 678         *priv = (unsigned long)pg;
 679         return kmap(pg);
 680 }
 681
 682 void jffs2_gc_release_page(struct jffs2_sb_info *c,
 683                            unsigned char *ptr,
 684                            unsigned long *priv)
 685 {
 686         struct page *pg = (void *)*priv;
 687
 688         kunmap(pg);
 689         page_cache_release(pg);
 690 }
 691
 692 static int jffs2_flash_setup(struct jffs2_sb_info *c) {
 693         int ret = 0;
 694
 695         if (jffs2_cleanmarker_oob(c)) {
 696                 /* NAND flash... do setup accordingly */
 697                 ret = jffs2_nand_flash_setup(c);
 698                 if (ret)
 699                         return ret;
 700         }
 701
 702         /* and Dataflash */
 703         if (jffs2_dataflash(c)) {
 704                 ret = jffs2_dataflash_setup(c);
 705                 if (ret)
 706                         return ret;
 707         }
 708
 709         /* and Intel "Sibley" flash */
 710         if (jffs2_nor_wbuf_flash(c)) {
 711                 ret = jffs2_nor_wbuf_flash_setup(c);
 712                 if (ret)
 713                         return ret;
 714         }
 715
 716         /* and an UBI volume */
 717         if (jffs2_ubivol(c)) {
 718                 ret = jffs2_ubivol_setup(c);
 719                 if (ret)
 720                         return ret;
 721         }
 722
 723         return ret;
 724 }
 725
 726 void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
 727
 728         if (jffs2_cleanmarker_oob(c)) {
 729                 jffs2_nand_flash_cleanup(c);
 730         }
 731
 732         /* and DataFlash */
 733         if (jffs2_dataflash(c)) {
 734                 jffs2_dataflash_cleanup(c);
 735         }
 736
 737         /* and Intel "Sibley" flash */
 738         if (jffs2_nor_wbuf_flash(c)) {
 739                 jffs2_nor_wbuf_flash_cleanup(c);
 740         }
 741
 742         /* and an UBI volume */
 743         if (jffs2_ubivol(c)) {
 744                 jffs2_ubivol_cleanup(c);
 745         }
 746 }