fs/jffs2/write.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright (C) 2001-2003 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  * $Id: write.c,v 1.87 2004/11/16 20:36:12 dwmw2 Exp $
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/fs.h>
  16 #include <linux/crc32.h>
  17 #include <linux/slab.h>
  18 #include <linux/pagemap.h>
  19 #include <linux/mtd/mtd.h>
  20 #include "nodelist.h"
  21 #include "compr.h"
  22
  23
  24 int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri)
  25 {
  26         struct jffs2_inode_cache *ic;
  27
  28         ic = jffs2_alloc_inode_cache();
  29         if (!ic) {
  30                 return -ENOMEM;
  31         }
  32
  33         memset(ic, 0, sizeof(*ic));
  34
  35         f->inocache = ic;
  36         f->inocache->nlink = 1;
  37         f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;
  38         f->inocache->ino = ++c->highest_ino;
  39         f->inocache->state = INO_STATE_PRESENT;
  40
  41         ri->ino = cpu_to_je32(f->inocache->ino);
  42
  43         D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino));
  44         jffs2_add_ino_cache(c, f->inocache);
  45
  46         ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
  47         ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
  48         ri->totlen = cpu_to_je32(PAD(sizeof(*ri)));
  49         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
  50         ri->mode = cpu_to_jemode(mode);
  51
  52         f->highest_version = 1;
  53         ri->version = cpu_to_je32(f->highest_version);
  54
  55         return 0;
  56 }
  57
  58 #if CONFIG_JFFS2_FS_DEBUG > 0
  59 static void writecheck(struct jffs2_sb_info *c, uint32_t ofs)
  60 {
  61         unsigned char buf[16];
  62         size_t retlen;
  63         int ret, i;
  64
  65         ret = jffs2_flash_read(c, ofs, 16, &retlen, buf);
  66         if (ret || (retlen != 16)) {
  67                 D1(printk(KERN_DEBUG "read failed or short in writecheck(). ret %d, retlen %zd\n", ret, retlen));
  68                 return;
  69         }
  70         ret = 0;
  71         for (i=0; i<16; i++) {
  72                 if (buf[i] != 0xff)
  73                         ret = 1;
  74         }
  75         if (ret) {
  76                 printk(KERN_WARNING "ARGH. About to write node to 0x%08x on flash, but there are data already there:\n", ofs);
  77                 printk(KERN_WARNING "0x%08x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
  78                        ofs,
  79                        buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7],
  80                        buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
  81         }
  82 }
  83 #endif
  84
  85
  86 /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it,
  87    write it to the flash, link it into the existing inode/fragment list */
  88
  89 struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const unsigned char *data, uint32_t datalen, uint32_t flash_ofs, int alloc_mode)
  90
  91 {
  92         struct jffs2_raw_node_ref *raw;
  93         struct jffs2_full_dnode *fn;
  94         size_t retlen;
  95         struct kvec vecs[2];
  96         int ret;
  97         int retried = 0;
  98         unsigned long cnt = 2;
  99
 100         D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) {
 101                 printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n");
 102                 BUG();
 103         }
 104            );
 105         vecs[0].iov_base = ri;
 106         vecs[0].iov_len = sizeof(*ri);
 107         vecs[1].iov_base = (unsigned char *)data;
 108         vecs[1].iov_len = datalen;
 109
 110         D1(writecheck(c, flash_ofs));
 111
 112         if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) {
 113                 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);
 114         }
 115         raw = jffs2_alloc_raw_node_ref();
 116         if (!raw)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         fn = jffs2_alloc_full_dnode();
 120         if (!fn) {
 121                 jffs2_free_raw_node_ref(raw);
 122                 return ERR_PTR(-ENOMEM);
 123         }
 124
 125         fn->ofs = je32_to_cpu(ri->offset);
 126         fn->size = je32_to_cpu(ri->dsize);
 127         fn->frags = 0;
 128
 129         /* check number of valid vecs */
 130         if (!datalen || !data)
 131                 cnt = 1;
 132  retry:
 133         fn->raw = raw;
 134
 135         raw->flash_offset = flash_ofs;
 136         raw->__totlen = PAD(sizeof(*ri)+datalen);
 137         raw->next_phys = NULL;
 138
 139         ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen,
 140                                  (alloc_mode==ALLOC_GC)?0:f->inocache->ino);
 141
 142         if (ret || (retlen != sizeof(*ri) + datalen)) {
 143                 printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
 144                        sizeof(*ri)+datalen, flash_ofs, ret, retlen);
 145
 146                 /* Mark the space as dirtied */
 147                 if (retlen) {
 148                         /* Doesn't belong to any inode */
 149                         raw->next_in_ino = NULL;
 150
 151                         /* Don't change raw->size to match retlen. We may have
 152                            written the node header already, and only the data will
 153                            seem corrupted, in which case the scan would skip over
 154                            any node we write before the original intended end of
 155                            this node */
 156                         raw->flash_offset |= REF_OBSOLETE;
 157                         jffs2_add_physical_node_ref(c, raw);
 158                         jffs2_mark_node_obsolete(c, raw);
 159                 } else {
 160                         printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset);
 161                         jffs2_free_raw_node_ref(raw);
 162                 }
 163                 if (!retried && alloc_mode != ALLOC_NORETRY && (raw = jffs2_alloc_raw_node_ref())) {
 164                         /* Try to reallocate space and retry */
 165                         uint32_t dummy;
 166                         struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
 167
 168                         retried = 1;
 169
 170                         D1(printk(KERN_DEBUG "Retrying failed write.\n"));
 171
 172                         ACCT_SANITY_CHECK(c,jeb);
 173                         D1(ACCT_PARANOIA_CHECK(jeb));
 174
 175                         if (alloc_mode == ALLOC_GC) {
 176                                 ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &flash_ofs, &dummy);
 177                         } else {
 178                                 /* Locking pain */
 179                                 up(&f->sem);
 180                                 jffs2_complete_reservation(c);
 181
 182                                 ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &flash_ofs, &dummy, alloc_mode);
 183                                 down(&f->sem);
 184                         }
 185
 186                         if (!ret) {
 187                                 D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs));
 188
 189                                 ACCT_SANITY_CHECK(c,jeb);
 190                                 D1(ACCT_PARANOIA_CHECK(jeb));
 191
 192                                 goto retry;
 193                         }
 194                         D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret));
 195                         jffs2_free_raw_node_ref(raw);
 196                 }
 197                 /* Release the full_dnode which is now useless, and return */
 198                 jffs2_free_full_dnode(fn);
 199                 return ERR_PTR(ret?ret:-EIO);
 200         }
 201         /* Mark the space used */
 202         /* If node covers at least a whole page, or if it starts at the
 203            beginning of a page and runs to the end of the file, or if
 204            it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
 205         */
 206         if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) ||
 207             ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) &&
 208               (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) ==  je32_to_cpu(ri->isize)))) {
 209                 raw->flash_offset |= REF_PRISTINE;
 210         } else {
 211                 raw->flash_offset |= REF_NORMAL;
 212         }
 213         jffs2_add_physical_node_ref(c, raw);
 214
 215         /* Link into per-inode list */
 216         spin_lock(&c->erase_completion_lock);
 217         raw->next_in_ino = f->inocache->nodes;
 218         f->inocache->nodes = raw;
 219         spin_unlock(&c->erase_completion_lock);
 220
 221         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",
 222                   flash_ofs, ref_flags(raw), je32_to_cpu(ri->dsize),
 223                   je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc),
 224                   je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen)));
 225
 226         if (retried) {
 227                 ACCT_SANITY_CHECK(c,NULL);
 228         }
 229
 230         return fn;
 231 }
 232
 233 struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_dirent *rd, const unsigned char *name, uint32_t namelen, uint32_t flash_ofs, int alloc_mode)
 234 {
 235         struct jffs2_raw_node_ref *raw;
 236         struct jffs2_full_dirent *fd;
 237         size_t retlen;
 238         struct kvec vecs[2];
 239         int retried = 0;
 240         int ret;
 241
 242         D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n",
 243                   je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino),
 244                   je32_to_cpu(rd->name_crc)));
 245         D1(writecheck(c, flash_ofs));
 246
 247         D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) {
 248                 printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n");
 249                 BUG();
 250         }
 251            );
 252
 253         vecs[0].iov_base = rd;
 254         vecs[0].iov_len = sizeof(*rd);
 255         vecs[1].iov_base = (unsigned char *)name;
 256         vecs[1].iov_len = namelen;
 257
 258         raw = jffs2_alloc_raw_node_ref();
 259
 260         if (!raw)
 261                 return ERR_PTR(-ENOMEM);
 262
 263         fd = jffs2_alloc_full_dirent(namelen+1);
 264         if (!fd) {
 265                 jffs2_free_raw_node_ref(raw);
 266                 return ERR_PTR(-ENOMEM);
 267         }
 268
 269         fd->version = je32_to_cpu(rd->version);
 270         fd->ino = je32_to_cpu(rd->ino);
 271         fd->nhash = full_name_hash(name, strlen(name));
 272         fd->type = rd->type;
 273         memcpy(fd->name, name, namelen);
 274         fd->name[namelen]=0;
 275
 276  retry:
 277         fd->raw = raw;
 278
 279         raw->flash_offset = flash_ofs;
 280         raw->__totlen = PAD(sizeof(*rd)+namelen);
 281         raw->next_phys = NULL;
 282
 283         ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen,
 284                                  (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino));
 285         if (ret || (retlen != sizeof(*rd) + namelen)) {
 286                 printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
 287                                sizeof(*rd)+namelen, flash_ofs, ret, retlen);
 288                 /* Mark the space as dirtied */
 289                 if (retlen) {
 290                         raw->next_in_ino = NULL;
 291                         raw->flash_offset |= REF_OBSOLETE;
 292                         jffs2_add_physical_node_ref(c, raw);
 293                         jffs2_mark_node_obsolete(c, raw);
 294                 } else {
 295                         printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset);
 296                         jffs2_free_raw_node_ref(raw);
 297                 }
 298                 if (!retried && (raw = jffs2_alloc_raw_node_ref())) {
 299                         /* Try to reallocate space and retry */
 300                         uint32_t dummy;
 301                         struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
 302
 303                         retried = 1;
 304
 305                         D1(printk(KERN_DEBUG "Retrying failed write.\n"));
 306
 307                         ACCT_SANITY_CHECK(c,jeb);
 308                         D1(ACCT_PARANOIA_CHECK(jeb));
 309
 310                         if (alloc_mode == ALLOC_GC) {
 311                                 ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &flash_ofs, &dummy);
 312                         } else {
 313                                 /* Locking pain */
 314                                 up(&f->sem);
 315                                 jffs2_complete_reservation(c);
 316
 317                                 ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &flash_ofs, &dummy, alloc_mode);
 318                                 down(&f->sem);
 319                         }
 320
 321                         if (!ret) {
 322                                 D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs));
 323                                 ACCT_SANITY_CHECK(c,jeb);
 324                                 D1(ACCT_PARANOIA_CHECK(jeb));
 325                                 goto retry;
 326                         }
 327                         D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret));
 328                         jffs2_free_raw_node_ref(raw);
 329                 }
 330                 /* Release the full_dnode which is now useless, and return */
 331                 jffs2_free_full_dirent(fd);
 332                 return ERR_PTR(ret?ret:-EIO);
 333         }
 334         /* Mark the space used */
 335         raw->flash_offset |= REF_PRISTINE;
 336         jffs2_add_physical_node_ref(c, raw);
 337
 338         spin_lock(&c->erase_completion_lock);
 339         raw->next_in_ino = f->inocache->nodes;
 340         f->inocache->nodes = raw;
 341         spin_unlock(&c->erase_completion_lock);
 342
 343         if (retried) {
 344                 ACCT_SANITY_CHECK(c,NULL);
 345         }
 346
 347         return fd;
 348 }
 349
 350 /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that
 351    we don't have to go digging in struct inode or its equivalent. It should set:
 352    mode, uid, gid, (starting)isize, atime, ctime, mtime */
 353 int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 354                             struct jffs2_raw_inode *ri, unsigned char *buf,
 355                             uint32_t offset, uint32_t writelen, uint32_t *retlen)
 356 {
 357         int ret = 0;
 358         uint32_t writtenlen = 0;
 359
 360         D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n",
 361                   f->inocache->ino, offset, writelen));
 362
 363         while(writelen) {
 364                 struct jffs2_full_dnode *fn;
 365                 unsigned char *comprbuf = NULL;
 366                 uint16_t comprtype = JFFS2_COMPR_NONE;
 367                 uint32_t phys_ofs, alloclen;
 368                 uint32_t datalen, cdatalen;
 369                 int retried = 0;
 370
 371         retry:
 372                 D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset));
 373
 374                 ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, &phys_ofs, &alloclen, ALLOC_NORMAL);
 375                 if (ret) {
 376                         D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret));
 377                         break;
 378                 }
 379                 down(&f->sem);
 380                 datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1)));
 381                 cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen);
 382
 383                 comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen);
 384
 385                 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 386                 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
 387                 ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen);
 388                 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 389
 390                 ri->ino = cpu_to_je32(f->inocache->ino);
 391                 ri->version = cpu_to_je32(++f->highest_version);
 392                 ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen));
 393                 ri->offset = cpu_to_je32(offset);
 394                 ri->csize = cpu_to_je32(cdatalen);
 395                 ri->dsize = cpu_to_je32(datalen);
 396                 ri->compr = comprtype & 0xff;
 397                 ri->usercompr = (comprtype >> 8 ) & 0xff;
 398                 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 399                 ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen));
 400
 401                 fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, phys_ofs, ALLOC_NORETRY);
 402
 403                 jffs2_free_comprbuf(comprbuf, buf);
 404
 405                 if (IS_ERR(fn)) {
 406                         ret = PTR_ERR(fn);
 407                         up(&f->sem);
 408                         jffs2_complete_reservation(c);
 409                         if (!retried) {
 410                                 /* Write error to be retried */
 411                                 retried = 1;
 412                                 D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n"));
 413                                 goto retry;
 414                         }
 415                         break;
 416                 }
 417                 ret = jffs2_add_full_dnode_to_inode(c, f, fn);
 418                 if (f->metadata) {
 419                         jffs2_mark_node_obsolete(c, f->metadata->raw);
 420                         jffs2_free_full_dnode(f->metadata);
 421                         f->metadata = NULL;
 422                 }
 423                 if (ret) {
 424                         /* Eep */
 425                         D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret));
 426                         jffs2_mark_node_obsolete(c, fn->raw);
 427                         jffs2_free_full_dnode(fn);
 428
 429                         up(&f->sem);
 430                         jffs2_complete_reservation(c);
 431                         break;
 432                 }
 433                 up(&f->sem);
 434                 jffs2_complete_reservation(c);
 435                 if (!datalen) {
 436                         printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n");
 437                         ret = -EIO;
 438                         break;
 439                 }
 440                 D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen));
 441                 writtenlen += datalen;
 442                 offset += datalen;
 443                 writelen -= datalen;
 444                 buf += datalen;
 445         }
 446         *retlen = writtenlen;
 447         return ret;
 448 }
 449
 450 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)
 451 {
 452         struct jffs2_raw_dirent *rd;
 453         struct jffs2_full_dnode *fn;
 454         struct jffs2_full_dirent *fd;
 455         uint32_t alloclen, phys_ofs;
 456         int ret;
 457
 458         /* Try to reserve enough space for both node and dirent.
 459          * Just the node will do for now, though
 460          */
 461         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
 462         D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen));
 463         if (ret) {
 464                 up(&f->sem);
 465                 return ret;
 466         }
 467
 468         ri->data_crc = cpu_to_je32(0);
 469         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 470
 471         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 472
 473         D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n",
 474                   jemode_to_cpu(ri->mode)));
 475
 476         if (IS_ERR(fn)) {
 477                 D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n"));
 478                 /* Eeek. Wave bye bye */
 479                 up(&f->sem);
 480                 jffs2_complete_reservation(c);
 481                 return PTR_ERR(fn);
 482         }
 483         /* No data here. Only a metadata node, which will be
 484            obsoleted by the first data write
 485         */
 486         f->metadata = fn;
 487
 488         up(&f->sem);
 489         jffs2_complete_reservation(c);
 490         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 491
 492         if (ret) {
 493                 /* Eep. */
 494                 D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n"));
 495                 return ret;
 496         }
 497
 498         rd = jffs2_alloc_raw_dirent();
 499         if (!rd) {
 500                 /* Argh. Now we treat it like a normal delete */
 501                 jffs2_complete_reservation(c);
 502                 return -ENOMEM;
 503         }
 504
 505         down(&dir_f->sem);
 506
 507         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 508         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 509         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 510         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 511
 512         rd->pino = cpu_to_je32(dir_f->inocache->ino);
 513         rd->version = cpu_to_je32(++dir_f->highest_version);
 514         rd->ino = ri->ino;
 515         rd->mctime = ri->ctime;
 516         rd->nsize = namelen;
 517         rd->type = DT_REG;
 518         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 519         rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
 520
 521         fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL);
 522
 523         jffs2_free_raw_dirent(rd);
 524
 525         if (IS_ERR(fd)) {
 526                 /* dirent failed to write. Delete the inode normally
 527                    as if it were the final unlink() */
 528                 jffs2_complete_reservation(c);
 529                 up(&dir_f->sem);
 530                 return PTR_ERR(fd);
 531         }
 532
 533         /* Link the fd into the inode's list, obsoleting an old
 534            one if necessary. */
 535         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 536
 537         jffs2_complete_reservation(c);
 538         up(&dir_f->sem);
 539
 540         return 0;
 541 }
 542
 543
 544 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
 545                     const char *name, int namelen, struct jffs2_inode_info *dead_f)
 546 {
 547         struct jffs2_raw_dirent *rd;
 548         struct jffs2_full_dirent *fd;
 549         uint32_t alloclen, phys_ofs;
 550         int ret;
 551
 552         if (1 /* alternative branch needs testing */ ||
 553             !jffs2_can_mark_obsolete(c)) {
 554                 /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */
 555
 556                 rd = jffs2_alloc_raw_dirent();
 557                 if (!rd)
 558                         return -ENOMEM;
 559
 560                 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_DELETION);
 561                 if (ret) {
 562                         jffs2_free_raw_dirent(rd);
 563                         return ret;
 564                 }
 565
 566                 down(&dir_f->sem);
 567
 568                 /* Build a deletion node */
 569                 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 570                 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 571                 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 572                 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 573
 574                 rd->pino = cpu_to_je32(dir_f->inocache->ino);
 575                 rd->version = cpu_to_je32(++dir_f->highest_version);
 576                 rd->ino = cpu_to_je32(0);
 577                 rd->mctime = cpu_to_je32(get_seconds());
 578                 rd->nsize = namelen;
 579                 rd->type = DT_UNKNOWN;
 580                 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 581                 rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
 582
 583                 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_DELETION);
 584
 585                 jffs2_free_raw_dirent(rd);
 586
 587                 if (IS_ERR(fd)) {
 588                         jffs2_complete_reservation(c);
 589                         up(&dir_f->sem);
 590                         return PTR_ERR(fd);
 591                 }
 592
 593                 /* File it. This will mark the old one obsolete. */
 594                 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 595                 up(&dir_f->sem);
 596         } else {
 597                 struct jffs2_full_dirent **prev = &dir_f->dents;
 598                 uint32_t nhash = full_name_hash(name, namelen);
 599
 600                 down(&dir_f->sem);
 601
 602                 while ((*prev) && (*prev)->nhash <= nhash) {
 603                         if ((*prev)->nhash == nhash &&
 604                             !memcmp((*prev)->name, name, namelen) &&
 605                             !(*prev)->name[namelen]) {
 606                                 struct jffs2_full_dirent *this = *prev;
 607
 608                                 D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n",
 609                                           this->ino, ref_offset(this->raw)));
 610
 611                                 *prev = this->next;
 612                                 jffs2_mark_node_obsolete(c, (this->raw));
 613                                 jffs2_free_full_dirent(this);
 614                                 break;
 615                         }
 616                         prev = &((*prev)->next);
 617                 }
 618                 up(&dir_f->sem);
 619         }
 620
 621         /* dead_f is NULL if this was a rename not a real unlink */
 622         /* Also catch the !f->inocache case, where there was a dirent
 623            pointing to an inode which didn't exist. */
 624         if (dead_f && dead_f->inocache) {
 625
 626                 down(&dead_f->sem);
 627
 628                 while (dead_f->dents) {
 629                         /* There can be only deleted ones */
 630                         fd = dead_f->dents;
 631
 632                         dead_f->dents = fd->next;
 633
 634                         if (fd->ino) {
 635                                 printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n",
 636                                        dead_f->inocache->ino, fd->name, fd->ino);
 637                         } else {
 638                                 D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", fd->name, dead_f->inocache->ino));
 639                         }
 640                         jffs2_mark_node_obsolete(c, fd->raw);
 641                         jffs2_free_full_dirent(fd);
 642                 }
 643
 644                 dead_f->inocache->nlink--;
 645                 /* NB: Caller must set inode nlink if appropriate */
 646                 up(&dead_f->sem);
 647         }
 648
 649         jffs2_complete_reservation(c);
 650
 651         return 0;
 652 }
 653
 654
 655 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)
 656 {
 657         struct jffs2_raw_dirent *rd;
 658         struct jffs2_full_dirent *fd;
 659         uint32_t alloclen, phys_ofs;
 660         int ret;
 661
 662         rd = jffs2_alloc_raw_dirent();
 663         if (!rd)
 664                 return -ENOMEM;
 665
 666         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 667         if (ret) {
 668                 jffs2_free_raw_dirent(rd);
 669                 return ret;
 670         }
 671
 672         down(&dir_f->sem);
 673
 674         /* Build a deletion node */
 675         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 676         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 677         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 678         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 679
 680         rd->pino = cpu_to_je32(dir_f->inocache->ino);
 681         rd->version = cpu_to_je32(++dir_f->highest_version);
 682         rd->ino = cpu_to_je32(ino);
 683         rd->mctime = cpu_to_je32(get_seconds());
 684         rd->nsize = namelen;
 685
 686         rd->type = type;
 687
 688         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 689         rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
 690
 691         fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL);
 692
 693         jffs2_free_raw_dirent(rd);
 694
 695         if (IS_ERR(fd)) {
 696                 jffs2_complete_reservation(c);
 697                 up(&dir_f->sem);
 698                 return PTR_ERR(fd);
 699         }
 700
 701         /* File it. This will mark the old one obsolete. */
 702         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 703
 704         jffs2_complete_reservation(c);
 705         up(&dir_f->sem);
 706
 707         return 0;
 708 }