git.oblomov.eu Git - linux-2.6/blob - fs/jffs2/write.c

   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/fs.h>
  14 #include <linux/crc32.h>
  15 #include <linux/slab.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/mtd/mtd.h>
  18 #include "nodelist.h"
  19 #include "compr.h"
  20
  21
  22 int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  23                        uint32_t mode, struct jffs2_raw_inode *ri)
  24 {
  25         struct jffs2_inode_cache *ic;
  26
  27         ic = jffs2_alloc_inode_cache();
  28         if (!ic) {
  29                 return -ENOMEM;
  30         }
  31
  32         memset(ic, 0, sizeof(*ic));
  33
  34         f->inocache = ic;
  35         f->inocache->pino_nlink = 1; /* Will be overwritten shortly for directories */
  36         f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;
  37         f->inocache->state = INO_STATE_PRESENT;
  38
  39         jffs2_add_ino_cache(c, f->inocache);
  40         D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino));
  41         ri->ino = cpu_to_je32(f->inocache->ino);
  42
  43         ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
  44         ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
  45         ri->totlen = cpu_to_je32(PAD(sizeof(*ri)));
  46         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
  47         ri->mode = cpu_to_jemode(mode);
  48
  49         f->highest_version = 1;
  50         ri->version = cpu_to_je32(f->highest_version);
  51
  52         return 0;
  53 }
  54
  55 /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it,
  56    write it to the flash, link it into the existing inode/fragment list */
  57
  58 struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  59                                            struct jffs2_raw_inode *ri, const unsigned char *data,
  60                                            uint32_t datalen, int alloc_mode)
  61
  62 {
  63         struct jffs2_full_dnode *fn;
  64         size_t retlen;
  65         uint32_t flash_ofs;
  66         struct kvec vecs[2];
  67         int ret;
  68         int retried = 0;
  69         unsigned long cnt = 2;
  70
  71         D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) {
  72                 printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n");
  73                 BUG();
  74         }
  75            );
  76         vecs[0].iov_base = ri;
  77         vecs[0].iov_len = sizeof(*ri);
  78         vecs[1].iov_base = (unsigned char *)data;
  79         vecs[1].iov_len = datalen;
  80
  81         if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) {
  82                 printk(KERN_WARNING "jffs2_write_dnode: ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n", je32_to_cpu(ri->totlen), sizeof(*ri), datalen);
  83         }
  84
  85         fn = jffs2_alloc_full_dnode();
  86         if (!fn)
  87                 return ERR_PTR(-ENOMEM);
  88
  89         /* check number of valid vecs */
  90         if (!datalen || !data)
  91                 cnt = 1;
  92  retry:
  93         flash_ofs = write_ofs(c);
  94
  95         jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len);
  96
  97         if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) {
  98                 BUG_ON(!retried);
  99                 D1(printk(KERN_DEBUG "jffs2_write_dnode : dnode_version %d, "
 100                                 "highest version %d -> updating dnode\n",
 101                                 je32_to_cpu(ri->version), f->highest_version));
 102                 ri->version = cpu_to_je32(++f->highest_version);
 103                 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 104         }
 105
 106         ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen,
 107                                  (alloc_mode==ALLOC_GC)?0:f->inocache->ino);
 108
 109         if (ret || (retlen != sizeof(*ri) + datalen)) {
 110                 printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
 111                        sizeof(*ri)+datalen, flash_ofs, ret, retlen);
 112
 113                 /* Mark the space as dirtied */
 114                 if (retlen) {
 115                         /* Don't change raw->size to match retlen. We may have
 116                            written the node header already, and only the data will
 117                            seem corrupted, in which case the scan would skip over
 118                            any node we write before the original intended end of
 119                            this node */
 120                         jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*ri)+datalen), NULL);
 121                 } else {
 122                         printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", flash_ofs);
 123                 }
 124                 if (!retried && alloc_mode != ALLOC_NORETRY) {
 125                         /* Try to reallocate space and retry */
 126                         uint32_t dummy;
 127                         struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
 128
 129                         retried = 1;
 130
 131                         D1(printk(KERN_DEBUG "Retrying failed write.\n"));
 132
 133                         jffs2_dbg_acct_sanity_check(c,jeb);
 134                         jffs2_dbg_acct_paranoia_check(c, jeb);
 135
 136                         if (alloc_mode == ALLOC_GC) {
 137                                 ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &dummy,
 138                                                              JFFS2_SUMMARY_INODE_SIZE);
 139                         } else {
 140                                 /* Locking pain */
 141                                 mutex_unlock(&f->sem);
 142                                 jffs2_complete_reservation(c);
 143
 144                                 ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &dummy,
 145                                                           alloc_mode, JFFS2_SUMMARY_INODE_SIZE);
 146                                 mutex_lock(&f->sem);
 147                         }
 148
 149                         if (!ret) {
 150                                 flash_ofs = write_ofs(c);
 151                                 D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs));
 152
 153                                 jffs2_dbg_acct_sanity_check(c,jeb);
 154                                 jffs2_dbg_acct_paranoia_check(c, jeb);
 155
 156                                 goto retry;
 157                         }
 158                         D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret));
 159                 }
 160                 /* Release the full_dnode which is now useless, and return */
 161                 jffs2_free_full_dnode(fn);
 162                 return ERR_PTR(ret?ret:-EIO);
 163         }
 164         /* Mark the space used */
 165         /* If node covers at least a whole page, or if it starts at the
 166            beginning of a page and runs to the end of the file, or if
 167            it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
 168         */
 169         if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) ||
 170             ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) &&
 171               (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) ==  je32_to_cpu(ri->isize)))) {
 172                 flash_ofs |= REF_PRISTINE;
 173         } else {
 174                 flash_ofs |= REF_NORMAL;
 175         }
 176         fn->raw = jffs2_add_physical_node_ref(c, flash_ofs, PAD(sizeof(*ri)+datalen), f->inocache);
 177         if (IS_ERR(fn->raw)) {
 178                 void *hold_err = fn->raw;
 179                 /* Release the full_dnode which is now useless, and return */
 180                 jffs2_free_full_dnode(fn);
 181                 return ERR_CAST(hold_err);
 182         }
 183         fn->ofs = je32_to_cpu(ri->offset);
 184         fn->size = je32_to_cpu(ri->dsize);
 185         fn->frags = 0;
 186
 187         D1(printk(KERN_DEBUG "jffs2_write_dnode wrote node at 0x%08x(%d) with dsize 0x%x, csize 0x%x, node_crc 0x%08x, data_crc 0x%08x, totlen 0x%08x\n",
 188                   flash_ofs & ~3, flash_ofs & 3, je32_to_cpu(ri->dsize),
 189                   je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc),
 190                   je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen)));
 191
 192         if (retried) {
 193                 jffs2_dbg_acct_sanity_check(c,NULL);
 194         }
 195
 196         return fn;
 197 }
 198
 199 struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 200                                              struct jffs2_raw_dirent *rd, const unsigned char *name,
 201                                              uint32_t namelen, int alloc_mode)
 202 {
 203         struct jffs2_full_dirent *fd;
 204         size_t retlen;
 205         struct kvec vecs[2];
 206         uint32_t flash_ofs;
 207         int retried = 0;
 208         int ret;
 209
 210         D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n",
 211                   je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino),
 212                   je32_to_cpu(rd->name_crc)));
 213
 214         D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) {
 215                 printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n");
 216                 BUG();
 217            });
 218
 219         if (strnlen(name, namelen) != namelen) {
 220                 /* This should never happen, but seems to have done on at least one
 221                    occasion: https://dev.laptop.org/ticket/4184 */
 222                 printk(KERN_CRIT "Error in jffs2_write_dirent() -- name contains zero bytes!\n");
 223                 printk(KERN_CRIT "Directory inode #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x\n",
 224                        je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino),
 225                        je32_to_cpu(rd->name_crc));
 226                 WARN_ON(1);
 227                 return ERR_PTR(-EIO);
 228         }
 229
 230         vecs[0].iov_base = rd;
 231         vecs[0].iov_len = sizeof(*rd);
 232         vecs[1].iov_base = (unsigned char *)name;
 233         vecs[1].iov_len = namelen;
 234
 235         fd = jffs2_alloc_full_dirent(namelen+1);
 236         if (!fd)
 237                 return ERR_PTR(-ENOMEM);
 238
 239         fd->version = je32_to_cpu(rd->version);
 240         fd->ino = je32_to_cpu(rd->ino);
 241         fd->nhash = full_name_hash(name, namelen);
 242         fd->type = rd->type;
 243         memcpy(fd->name, name, namelen);
 244         fd->name[namelen]=0;
 245
 246  retry:
 247         flash_ofs = write_ofs(c);
 248
 249         jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len);
 250
 251         if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) {
 252                 BUG_ON(!retried);
 253                 D1(printk(KERN_DEBUG "jffs2_write_dirent : dirent_version %d, "
 254                                      "highest version %d -> updating dirent\n",
 255                                      je32_to_cpu(rd->version), f->highest_version));
 256                 rd->version = cpu_to_je32(++f->highest_version);
 257                 fd->version = je32_to_cpu(rd->version);
 258                 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 259         }
 260
 261         ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen,
 262                                  (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino));
 263         if (ret || (retlen != sizeof(*rd) + namelen)) {
 264                 printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
 265                                sizeof(*rd)+namelen, flash_ofs, ret, retlen);
 266                 /* Mark the space as dirtied */
 267                 if (retlen) {
 268                         jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*rd)+namelen), NULL);
 269                 } else {
 270                         printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", flash_ofs);
 271                 }
 272                 if (!retried) {
 273                         /* Try to reallocate space and retry */
 274                         uint32_t dummy;
 275                         struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
 276
 277                         retried = 1;
 278
 279                         D1(printk(KERN_DEBUG "Retrying failed write.\n"));
 280
 281                         jffs2_dbg_acct_sanity_check(c,jeb);
 282                         jffs2_dbg_acct_paranoia_check(c, jeb);
 283
 284                         if (alloc_mode == ALLOC_GC) {
 285                                 ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &dummy,
 286                                                              JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 287                         } else {
 288                                 /* Locking pain */
 289                                 mutex_unlock(&f->sem);
 290                                 jffs2_complete_reservation(c);
 291
 292                                 ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &dummy,
 293                                                           alloc_mode, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 294                                 mutex_lock(&f->sem);
 295                         }
 296
 297                         if (!ret) {
 298                                 flash_ofs = write_ofs(c);
 299                                 D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs));
 300                                 jffs2_dbg_acct_sanity_check(c,jeb);
 301                                 jffs2_dbg_acct_paranoia_check(c, jeb);
 302                                 goto retry;
 303                         }
 304                         D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret));
 305                 }
 306                 /* Release the full_dnode which is now useless, and return */
 307                 jffs2_free_full_dirent(fd);
 308                 return ERR_PTR(ret?ret:-EIO);
 309         }
 310         /* Mark the space used */
 311         fd->raw = jffs2_add_physical_node_ref(c, flash_ofs | dirent_node_state(rd),
 312                                               PAD(sizeof(*rd)+namelen), f->inocache);
 313         if (IS_ERR(fd->raw)) {
 314                 void *hold_err = fd->raw;
 315                 /* Release the full_dirent which is now useless, and return */
 316                 jffs2_free_full_dirent(fd);
 317                 return ERR_CAST(hold_err);
 318         }
 319
 320         if (retried) {
 321                 jffs2_dbg_acct_sanity_check(c,NULL);
 322         }
 323
 324         return fd;
 325 }
 326
 327 /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that
 328    we don't have to go digging in struct inode or its equivalent. It should set:
 329    mode, uid, gid, (starting)isize, atime, ctime, mtime */
 330 int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 331                             struct jffs2_raw_inode *ri, unsigned char *buf,
 332                             uint32_t offset, uint32_t writelen, uint32_t *retlen)
 333 {
 334         int ret = 0;
 335         uint32_t writtenlen = 0;
 336
 337         D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n",
 338                   f->inocache->ino, offset, writelen));
 339
 340         while(writelen) {
 341                 struct jffs2_full_dnode *fn;
 342                 unsigned char *comprbuf = NULL;
 343                 uint16_t comprtype = JFFS2_COMPR_NONE;
 344                 uint32_t alloclen;
 345                 uint32_t datalen, cdatalen;
 346                 int retried = 0;
 347
 348         retry:
 349                 D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset));
 350
 351                 ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN,
 352                                         &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 353                 if (ret) {
 354                         D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret));
 355                         break;
 356                 }
 357                 mutex_lock(&f->sem);
 358                 datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1)));
 359                 cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen);
 360
 361                 comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen);
 362
 363                 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 364                 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
 365                 ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen);
 366                 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 367
 368                 ri->ino = cpu_to_je32(f->inocache->ino);
 369                 ri->version = cpu_to_je32(++f->highest_version);
 370                 ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen));
 371                 ri->offset = cpu_to_je32(offset);
 372                 ri->csize = cpu_to_je32(cdatalen);
 373                 ri->dsize = cpu_to_je32(datalen);
 374                 ri->compr = comprtype & 0xff;
 375                 ri->usercompr = (comprtype >> 8 ) & 0xff;
 376                 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 377                 ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen));
 378
 379                 fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, ALLOC_NORETRY);
 380
 381                 jffs2_free_comprbuf(comprbuf, buf);
 382
 383                 if (IS_ERR(fn)) {
 384                         ret = PTR_ERR(fn);
 385                         mutex_unlock(&f->sem);
 386                         jffs2_complete_reservation(c);
 387                         if (!retried) {
 388                                 /* Write error to be retried */
 389                                 retried = 1;
 390                                 D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n"));
 391                                 goto retry;
 392                         }
 393                         break;
 394                 }
 395                 ret = jffs2_add_full_dnode_to_inode(c, f, fn);
 396                 if (f->metadata) {
 397                         jffs2_mark_node_obsolete(c, f->metadata->raw);
 398                         jffs2_free_full_dnode(f->metadata);
 399                         f->metadata = NULL;
 400                 }
 401                 if (ret) {
 402                         /* Eep */
 403                         D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret));
 404                         jffs2_mark_node_obsolete(c, fn->raw);
 405                         jffs2_free_full_dnode(fn);
 406
 407                         mutex_unlock(&f->sem);
 408                         jffs2_complete_reservation(c);
 409                         break;
 410                 }
 411                 mutex_unlock(&f->sem);
 412                 jffs2_complete_reservation(c);
 413                 if (!datalen) {
 414                         printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n");
 415                         ret = -EIO;
 416                         break;
 417                 }
 418                 D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen));
 419                 writtenlen += datalen;
 420                 offset += datalen;
 421                 writelen -= datalen;
 422                 buf += datalen;
 423         }
 424         *retlen = writtenlen;
 425         return ret;
 426 }
 427
 428 int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const char *name, int namelen)
 429 {
 430         struct jffs2_raw_dirent *rd;
 431         struct jffs2_full_dnode *fn;
 432         struct jffs2_full_dirent *fd;
 433         uint32_t alloclen;
 434         int ret;
 435
 436         /* Try to reserve enough space for both node and dirent.
 437          * Just the node will do for now, though
 438          */
 439         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 440                                 JFFS2_SUMMARY_INODE_SIZE);
 441         D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen));
 442         if (ret)
 443                 return ret;
 444
 445         mutex_lock(&f->sem);
 446
 447         ri->data_crc = cpu_to_je32(0);
 448         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 449
 450         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 451
 452         D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n",
 453                   jemode_to_cpu(ri->mode)));
 454
 455         if (IS_ERR(fn)) {
 456                 D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n"));
 457                 /* Eeek. Wave bye bye */
 458                 mutex_unlock(&f->sem);
 459                 jffs2_complete_reservation(c);
 460                 return PTR_ERR(fn);
 461         }
 462         /* No data here. Only a metadata node, which will be
 463            obsoleted by the first data write
 464         */
 465         f->metadata = fn;
 466
 467         mutex_unlock(&f->sem);
 468         jffs2_complete_reservation(c);
 469
 470         ret = jffs2_init_security(&f->vfs_inode, &dir_f->vfs_inode);
 471         if (ret)
 472                 return ret;
 473         ret = jffs2_init_acl_post(&f->vfs_inode);
 474         if (ret)
 475                 return ret;
 476
 477         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 478                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 479
 480         if (ret) {
 481                 /* Eep. */
 482                 D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n"));
 483                 return ret;
 484         }
 485
 486         rd = jffs2_alloc_raw_dirent();
 487         if (!rd) {
 488                 /* Argh. Now we treat it like a normal delete */
 489                 jffs2_complete_reservation(c);
 490                 return -ENOMEM;
 491         }
 492
 493         mutex_lock(&dir_f->sem);
 494
 495         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 496         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 497         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 498         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 499
 500         rd->pino = cpu_to_je32(dir_f->inocache->ino);
 501         rd->version = cpu_to_je32(++dir_f->highest_version);
 502         rd->ino = ri->ino;
 503         rd->mctime = ri->ctime;
 504         rd->nsize = namelen;
 505         rd->type = DT_REG;
 506         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 507         rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
 508
 509         fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL);
 510
 511         jffs2_free_raw_dirent(rd);
 512
 513         if (IS_ERR(fd)) {
 514                 /* dirent failed to write. Delete the inode normally
 515                    as if it were the final unlink() */
 516                 jffs2_complete_reservation(c);
 517                 mutex_unlock(&dir_f->sem);
 518                 return PTR_ERR(fd);
 519         }
 520
 521         /* Link the fd into the inode's list, obsoleting an old
 522            one if necessary. */
 523         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 524
 525         jffs2_complete_reservation(c);
 526         mutex_unlock(&dir_f->sem);
 527
 528         return 0;
 529 }
 530
 531
 532 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
 533                     const char *name, int namelen, struct jffs2_inode_info *dead_f,
 534                     uint32_t time)
 535 {
 536         struct jffs2_raw_dirent *rd;
 537         struct jffs2_full_dirent *fd;
 538         uint32_t alloclen;
 539         int ret;
 540
 541         if (!jffs2_can_mark_obsolete(c)) {
 542                 /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */
 543
 544                 rd = jffs2_alloc_raw_dirent();
 545                 if (!rd)
 546                         return -ENOMEM;
 547
 548                 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 549                                         ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 550                 if (ret) {
 551                         jffs2_free_raw_dirent(rd);
 552                         return ret;
 553                 }
 554
 555                 mutex_lock(&dir_f->sem);
 556
 557                 /* Build a deletion node */
 558                 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 559                 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 560                 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 561                 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 562
 563                 rd->pino = cpu_to_je32(dir_f->inocache->ino);
 564                 rd->version = cpu_to_je32(++dir_f->highest_version);
 565                 rd->ino = cpu_to_je32(0);
 566                 rd->mctime = cpu_to_je32(time);
 567                 rd->nsize = namelen;
 568                 rd->type = DT_UNKNOWN;
 569                 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 570                 rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
 571
 572                 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_DELETION);
 573
 574                 jffs2_free_raw_dirent(rd);
 575
 576                 if (IS_ERR(fd)) {
 577                         jffs2_complete_reservation(c);
 578                         mutex_unlock(&dir_f->sem);
 579                         return PTR_ERR(fd);
 580                 }
 581
 582                 /* File it. This will mark the old one obsolete. */
 583                 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 584                 mutex_unlock(&dir_f->sem);
 585         } else {
 586                 uint32_t nhash = full_name_hash(name, namelen);
 587
 588                 fd = dir_f->dents;
 589                 /* We don't actually want to reserve any space, but we do
 590                    want to be holding the alloc_sem when we write to flash */
 591                 mutex_lock(&c->alloc_sem);
 592                 mutex_lock(&dir_f->sem);
 593
 594                 for (fd = dir_f->dents; fd; fd = fd->next) {
 595                         if (fd->nhash == nhash &&
 596                             !memcmp(fd->name, name, namelen) &&
 597                             !fd->name[namelen]) {
 598
 599                                 D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n",
 600                                           fd->ino, ref_offset(fd->raw)));
 601                                 jffs2_mark_node_obsolete(c, fd->raw);
 602                                 /* We don't want to remove it from the list immediately,
 603                                    because that screws up getdents()/seek() semantics even
 604                                    more than they're screwed already. Turn it into a
 605                                    node-less deletion dirent instead -- a placeholder */
 606                                 fd->raw = NULL;
 607                                 fd->ino = 0;
 608                                 break;
 609                         }
 610                 }
 611                 mutex_unlock(&dir_f->sem);
 612         }
 613
 614         /* dead_f is NULL if this was a rename not a real unlink */
 615         /* Also catch the !f->inocache case, where there was a dirent
 616            pointing to an inode which didn't exist. */
 617         if (dead_f && dead_f->inocache) {
 618
 619                 mutex_lock(&dead_f->sem);
 620
 621                 if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) {
 622                         while (dead_f->dents) {
 623                                 /* There can be only deleted ones */
 624                                 fd = dead_f->dents;
 625
 626                                 dead_f->dents = fd->next;
 627
 628                                 if (fd->ino) {
 629                                         printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n",
 630                                                dead_f->inocache->ino, fd->name, fd->ino);
 631                                 } else {
 632                                         D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n",
 633                                                 fd->name, dead_f->inocache->ino));
 634                                 }
 635                                 if (fd->raw)
 636                                         jffs2_mark_node_obsolete(c, fd->raw);
 637                                 jffs2_free_full_dirent(fd);
 638                         }
 639                         dead_f->inocache->pino_nlink = 0;
 640                 } else
 641                         dead_f->inocache->pino_nlink--;
 642                 /* NB: Caller must set inode nlink if appropriate */
 643                 mutex_unlock(&dead_f->sem);
 644         }
 645
 646         jffs2_complete_reservation(c);
 647
 648         return 0;
 649 }
 650
 651
 652 int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen, uint32_t time)
 653 {
 654         struct jffs2_raw_dirent *rd;
 655         struct jffs2_full_dirent *fd;
 656         uint32_t alloclen;
 657         int ret;
 658
 659         rd = jffs2_alloc_raw_dirent();
 660         if (!rd)
 661                 return -ENOMEM;
 662
 663         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 664                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 665         if (ret) {
 666                 jffs2_free_raw_dirent(rd);
 667                 return ret;
 668         }
 669
 670         mutex_lock(&dir_f->sem);
 671
 672         /* Build a deletion node */
 673         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 674         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 675         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 676         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 677
 678         rd->pino = cpu_to_je32(dir_f->inocache->ino);
 679         rd->version = cpu_to_je32(++dir_f->highest_version);
 680         rd->ino = cpu_to_je32(ino);
 681         rd->mctime = cpu_to_je32(time);
 682         rd->nsize = namelen;
 683
 684         rd->type = type;
 685
 686         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 687         rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
 688
 689         fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL);
 690
 691         jffs2_free_raw_dirent(rd);
 692
 693         if (IS_ERR(fd)) {
 694                 jffs2_complete_reservation(c);
 695                 mutex_unlock(&dir_f->sem);
 696                 return PTR_ERR(fd);
 697         }
 698
 699         /* File it. This will mark the old one obsolete. */
 700         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 701
 702         jffs2_complete_reservation(c);
 703         mutex_unlock(&dir_f->sem);
 704
 705         return 0;
 706 }