1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2006 NEC Corporation 5 * 6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <linux/kernel.h> 15 #include <linux/slab.h> 16 #include <linux/fs.h> 17 #include <linux/time.h> 18 #include <linux/pagemap.h> 19 #include <linux/highmem.h> 20 #include <linux/crc32.h> 21 #include <linux/jffs2.h> 22 #include <linux/xattr.h> 23 #include <linux/mtd/mtd.h> 24 #include "nodelist.h" 25 /* -------- xdatum related functions ---------------- 26 * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 27 * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 28 * the index of the xattr name/value pair cache (c->xattrindex). 29 * is_xattr_datum_unchecked(c, xd) 30 * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 31 * unchecked, it returns 0. 32 * unload_xattr_datum(c, xd) 33 * is used to release xattr name/value pair and detach from c->xattrindex. 34 * reclaim_xattr_datum(c) 35 * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 36 * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold 37 * is hard coded as 32KiB. 38 * do_verify_xattr_datum(c, xd) 39 * is used to load the xdatum informations without name/value pair from the medium. 40 * It's necessary once, because those informations are not collected during mounting 41 * process when EBS is enabled. 42 * 0 will be returned, if success. An negative return value means recoverable error, and 43 * positive return value means unrecoverable error. Thus, caller must remove this xdatum 44 * and xref when it returned positive value. 45 * do_load_xattr_datum(c, xd) 46 * is used to load name/value pair from the medium. 47 * The meanings of return value is same as do_verify_xattr_datum(). 48 * load_xattr_datum(c, xd) 49 * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 50 * If xd need to call do_verify_xattr_datum() at first, it's called before calling 51 * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 52 * save_xattr_datum(c, xd) 53 * is used to write xdatum to medium. xd->version will be incremented. 54 * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 55 * is used to create new xdatum and write to medium. 56 * unrefer_xattr_datum(c, xd) 57 * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD 58 * is set on xd->flags and chained xattr_dead_list or release it immediately. 59 * In the first case, the garbage collector release it later. 60 * -------------------------------------------------- */ 61 static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 62 { 63 int name_len = strlen(xname); 64 65 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 66 } 67 68 static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 69 { 70 struct jffs2_raw_node_ref *raw; 71 int rc = 0; 72 73 spin_lock(&c->erase_completion_lock); 74 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 75 if (ref_flags(raw) == REF_UNCHECKED) { 76 rc = 1; 77 break; 78 } 79 } 80 spin_unlock(&c->erase_completion_lock); 81 return rc; 82 } 83 84 static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 85 { 86 /* must be called under down_write(xattr_sem) */ 87 D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); 88 if (xd->xname) { 89 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 90 kfree(xd->xname); 91 } 92 93 list_del_init(&xd->xindex); 94 xd->hashkey = 0; 95 xd->xname = NULL; 96 xd->xvalue = NULL; 97 } 98 99 static void reclaim_xattr_datum(struct jffs2_sb_info *c) 100 { 101 /* must be called under down_write(xattr_sem) */ 102 struct jffs2_xattr_datum *xd, *_xd; 103 uint32_t target, before; 104 static int index = 0; 105 int count; 106 107 if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 108 return; 109 110 before = c->xdatum_mem_usage; 111 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 112 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 113 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 114 if (xd->flags & JFFS2_XFLAGS_HOT) { 115 xd->flags &= ~JFFS2_XFLAGS_HOT; 116 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 117 unload_xattr_datum(c, xd); 118 } 119 if (c->xdatum_mem_usage <= target) 120 goto out; 121 } 122 index = (index+1) % XATTRINDEX_HASHSIZE; 123 } 124 out: 125 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 126 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 127 } 128 129 static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 130 { 131 /* must be called under down_write(xattr_sem) */ 132 struct jffs2_eraseblock *jeb; 133 struct jffs2_raw_node_ref *raw; 134 struct jffs2_raw_xattr rx; 135 size_t readlen; 136 uint32_t crc, offset, totlen; 137 int rc; 138 139 spin_lock(&c->erase_completion_lock); 140 offset = ref_offset(xd->node); 141 if (ref_flags(xd->node) == REF_PRISTINE) 142 goto complete; 143 spin_unlock(&c->erase_completion_lock); 144 145 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 146 if (rc || readlen != sizeof(rx)) { 147 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 148 rc, sizeof(rx), readlen, offset); 149 return rc ? rc : -EIO; 150 } 151 crc = crc32(0, &rx, sizeof(rx) - 4); 152 if (crc != je32_to_cpu(rx.node_crc)) { 153 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 154 offset, je32_to_cpu(rx.hdr_crc), crc); 155 xd->flags |= JFFS2_XFLAGS_INVALID; 156 return -EIO; 157 } 158 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 159 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 160 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 161 || je32_to_cpu(rx.totlen) != totlen 162 || je32_to_cpu(rx.xid) != xd->xid 163 || je32_to_cpu(rx.version) != xd->version) { 164 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 165 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 166 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, 167 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, 168 je32_to_cpu(rx.totlen), totlen, 169 je32_to_cpu(rx.xid), xd->xid, 170 je32_to_cpu(rx.version), xd->version); 171 xd->flags |= JFFS2_XFLAGS_INVALID; 172 return -EIO; 173 } 174 xd->xprefix = rx.xprefix; 175 xd->name_len = rx.name_len; 176 xd->value_len = je16_to_cpu(rx.value_len); 177 xd->data_crc = je32_to_cpu(rx.data_crc); 178 179 spin_lock(&c->erase_completion_lock); 180 complete: 181 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 182 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 183 totlen = PAD(ref_totlen(c, jeb, raw)); 184 if (ref_flags(raw) == REF_UNCHECKED) { 185 c->unchecked_size -= totlen; c->used_size += totlen; 186 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 187 } 188 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 189 } 190 spin_unlock(&c->erase_completion_lock); 191 192 /* unchecked xdatum is chained with c->xattr_unchecked */ 193 list_del_init(&xd->xindex); 194 195 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", 196 xd->xid, xd->version); 197 198 return 0; 199 } 200 201 static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 202 { 203 /* must be called under down_write(xattr_sem) */ 204 char *data; 205 size_t readlen; 206 uint32_t crc, length; 207 int i, ret, retry = 0; 208 209 BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 210 BUG_ON(!list_empty(&xd->xindex)); 211 retry: 212 length = xd->name_len + 1 + xd->value_len; 213 data = kmalloc(length, GFP_KERNEL); 214 if (!data) 215 return -ENOMEM; 216 217 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 218 length, &readlen, data); 219 220 if (ret || length!=readlen) { 221 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 222 ret, length, readlen, ref_offset(xd->node)); 223 kfree(data); 224 return ret ? ret : -EIO; 225 } 226 227 data[xd->name_len] = '\0'; 228 crc = crc32(0, data, length); 229 if (crc != xd->data_crc) { 230 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" 231 " at %#08x, read: 0x%08x calculated: 0x%08x\n", 232 ref_offset(xd->node), xd->data_crc, crc); 233 kfree(data); 234 xd->flags |= JFFS2_XFLAGS_INVALID; 235 return -EIO; 236 } 237 238 xd->flags |= JFFS2_XFLAGS_HOT; 239 xd->xname = data; 240 xd->xvalue = data + xd->name_len+1; 241 242 c->xdatum_mem_usage += length; 243 244 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 245 i = xd->hashkey % XATTRINDEX_HASHSIZE; 246 list_add(&xd->xindex, &c->xattrindex[i]); 247 if (!retry) { 248 retry = 1; 249 reclaim_xattr_datum(c); 250 if (!xd->xname) 251 goto retry; 252 } 253 254 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 255 xd->xid, xd->xprefix, xd->xname); 256 257 return 0; 258 } 259 260 static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 261 { 262 /* must be called under down_write(xattr_sem); 263 * rc < 0 : recoverable error, try again 264 * rc = 0 : success 265 * rc > 0 : Unrecoverable error, this node should be deleted. 266 */ 267 int rc = 0; 268 269 BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 270 if (xd->xname) 271 return 0; 272 if (xd->flags & JFFS2_XFLAGS_INVALID) 273 return -EIO; 274 if (unlikely(is_xattr_datum_unchecked(c, xd))) 275 rc = do_verify_xattr_datum(c, xd); 276 if (!rc) 277 rc = do_load_xattr_datum(c, xd); 278 return rc; 279 } 280 281 static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 282 { 283 /* must be called under down_write(xattr_sem) */ 284 struct jffs2_raw_xattr rx; 285 struct kvec vecs[2]; 286 size_t length; 287 int rc, totlen; 288 uint32_t phys_ofs = write_ofs(c); 289 290 BUG_ON(!xd->xname); 291 BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 292 293 vecs[0].iov_base = ℞ 294 vecs[0].iov_len = sizeof(rx); 295 vecs[1].iov_base = xd->xname; 296 vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 297 totlen = vecs[0].iov_len + vecs[1].iov_len; 298 299 /* Setup raw-xattr */ 300 memset(&rx, 0, sizeof(rx)); 301 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 302 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 303 rx.totlen = cpu_to_je32(PAD(totlen)); 304 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 305 306 rx.xid = cpu_to_je32(xd->xid); 307 rx.version = cpu_to_je32(++xd->version); 308 rx.xprefix = xd->xprefix; 309 rx.name_len = xd->name_len; 310 rx.value_len = cpu_to_je16(xd->value_len); 311 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 312 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 313 314 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 315 if (rc || totlen != length) { 316 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 317 rc, totlen, length, phys_ofs); 318 rc = rc ? rc : -EIO; 319 if (length) 320 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 321 322 return rc; 323 } 324 /* success */ 325 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 326 327 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 328 xd->xid, xd->version, xd->xprefix, xd->xname); 329 330 return 0; 331 } 332 333 static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 334 int xprefix, const char *xname, 335 const char *xvalue, int xsize) 336 { 337 /* must be called under down_write(xattr_sem) */ 338 struct jffs2_xattr_datum *xd; 339 uint32_t hashkey, name_len; 340 char *data; 341 int i, rc; 342 343 /* Search xattr_datum has same xname/xvalue by index */ 344 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 345 i = hashkey % XATTRINDEX_HASHSIZE; 346 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 347 if (xd->hashkey==hashkey 348 && xd->xprefix==xprefix 349 && xd->value_len==xsize 350 && !strcmp(xd->xname, xname) 351 && !memcmp(xd->xvalue, xvalue, xsize)) { 352 atomic_inc(&xd->refcnt); 353 return xd; 354 } 355 } 356 357 /* Not found, Create NEW XATTR-Cache */ 358 name_len = strlen(xname); 359 360 xd = jffs2_alloc_xattr_datum(); 361 if (!xd) 362 return ERR_PTR(-ENOMEM); 363 364 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 365 if (!data) { 366 jffs2_free_xattr_datum(xd); 367 return ERR_PTR(-ENOMEM); 368 } 369 strcpy(data, xname); 370 memcpy(data + name_len + 1, xvalue, xsize); 371 372 atomic_set(&xd->refcnt, 1); 373 xd->xid = ++c->highest_xid; 374 xd->flags |= JFFS2_XFLAGS_HOT; 375 xd->xprefix = xprefix; 376 377 xd->hashkey = hashkey; 378 xd->xname = data; 379 xd->xvalue = data + name_len + 1; 380 xd->name_len = name_len; 381 xd->value_len = xsize; 382 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 383 384 rc = save_xattr_datum(c, xd); 385 if (rc) { 386 kfree(xd->xname); 387 jffs2_free_xattr_datum(xd); 388 return ERR_PTR(rc); 389 } 390 391 /* Insert Hash Index */ 392 i = hashkey % XATTRINDEX_HASHSIZE; 393 list_add(&xd->xindex, &c->xattrindex[i]); 394 395 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 396 reclaim_xattr_datum(c); 397 398 return xd; 399 } 400 401 static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 402 { 403 /* must be called under down_write(xattr_sem) */ 404 if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { 405 unload_xattr_datum(c, xd); 406 xd->flags |= JFFS2_XFLAGS_DEAD; 407 if (xd->node == (void *)xd) { 408 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); 409 jffs2_free_xattr_datum(xd); 410 } else { 411 list_add(&xd->xindex, &c->xattr_dead_list); 412 } 413 spin_unlock(&c->erase_completion_lock); 414 415 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", 416 xd->xid, xd->version); 417 } 418 } 419 420 /* -------- xref related functions ------------------ 421 * verify_xattr_ref(c, ref) 422 * is used to load xref information from medium. Because summary data does not 423 * contain xid/ino, it's necessary to verify once while mounting process. 424 * save_xattr_ref(c, ref) 425 * is used to write xref to medium. If delete marker is marked, it write 426 * a delete marker of xref into medium. 427 * create_xattr_ref(c, ic, xd) 428 * is used to create a new xref and write to medium. 429 * delete_xattr_ref(c, ref) 430 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 431 * and allows GC to reclaim those physical nodes. 432 * jffs2_xattr_delete_inode(c, ic) 433 * is called to remove xrefs related to obsolete inode when inode is unlinked. 434 * jffs2_xattr_free_inode(c, ic) 435 * is called to release xattr related objects when unmounting. 436 * check_xattr_ref_inode(c, ic) 437 * is used to confirm inode does not have duplicate xattr name/value pair. 438 * -------------------------------------------------- */ 439 static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 440 { 441 struct jffs2_eraseblock *jeb; 442 struct jffs2_raw_node_ref *raw; 443 struct jffs2_raw_xref rr; 444 size_t readlen; 445 uint32_t crc, offset, totlen; 446 int rc; 447 448 spin_lock(&c->erase_completion_lock); 449 if (ref_flags(ref->node) != REF_UNCHECKED) 450 goto complete; 451 offset = ref_offset(ref->node); 452 spin_unlock(&c->erase_completion_lock); 453 454 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 455 if (rc || sizeof(rr) != readlen) { 456 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 457 rc, sizeof(rr), readlen, offset); 458 return rc ? rc : -EIO; 459 } 460 /* obsolete node */ 461 crc = crc32(0, &rr, sizeof(rr) - 4); 462 if (crc != je32_to_cpu(rr.node_crc)) { 463 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 464 offset, je32_to_cpu(rr.node_crc), crc); 465 return -EIO; 466 } 467 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK 468 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF 469 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { 470 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 471 "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 472 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 473 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 474 je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 475 return -EIO; 476 } 477 ref->ino = je32_to_cpu(rr.ino); 478 ref->xid = je32_to_cpu(rr.xid); 479 ref->xseqno = je32_to_cpu(rr.xseqno); 480 if (ref->xseqno > c->highest_xseqno) 481 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 482 483 spin_lock(&c->erase_completion_lock); 484 complete: 485 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 486 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 487 totlen = PAD(ref_totlen(c, jeb, raw)); 488 if (ref_flags(raw) == REF_UNCHECKED) { 489 c->unchecked_size -= totlen; c->used_size += totlen; 490 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 491 } 492 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 493 } 494 spin_unlock(&c->erase_completion_lock); 495 496 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 497 ref->ino, ref->xid, ref_offset(ref->node)); 498 return 0; 499 } 500 501 static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 502 { 503 /* must be called under down_write(xattr_sem) */ 504 struct jffs2_raw_xref rr; 505 size_t length; 506 uint32_t xseqno, phys_ofs = write_ofs(c); 507 int ret; 508 509 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 510 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 511 rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 512 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 513 514 xseqno = (c->highest_xseqno += 2); 515 if (is_xattr_ref_dead(ref)) { 516 xseqno |= XREF_DELETE_MARKER; 517 rr.ino = cpu_to_je32(ref->ino); 518 rr.xid = cpu_to_je32(ref->xid); 519 } else { 520 rr.ino = cpu_to_je32(ref->ic->ino); 521 rr.xid = cpu_to_je32(ref->xd->xid); 522 } 523 rr.xseqno = cpu_to_je32(xseqno); 524 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 525 526 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 527 if (ret || sizeof(rr) != length) { 528 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 529 ret, sizeof(rr), length, phys_ofs); 530 ret = ret ? ret : -EIO; 531 if (length) 532 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 533 534 return ret; 535 } 536 /* success */ 537 ref->xseqno = xseqno; 538 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 539 540 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 541 542 return 0; 543 } 544 545 static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 546 struct jffs2_xattr_datum *xd) 547 { 548 /* must be called under down_write(xattr_sem) */ 549 struct jffs2_xattr_ref *ref; 550 int ret; 551 552 ref = jffs2_alloc_xattr_ref(); 553 if (!ref) 554 return ERR_PTR(-ENOMEM); 555 ref->ic = ic; 556 ref->xd = xd; 557 558 ret = save_xattr_ref(c, ref); 559 if (ret) { 560 jffs2_free_xattr_ref(ref); 561 return ERR_PTR(ret); 562 } 563 564 /* Chain to inode */ 565 ref->next = ic->xref; 566 ic->xref = ref; 567 568 return ref; /* success */ 569 } 570 571 static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 572 { 573 /* must be called under down_write(xattr_sem) */ 574 struct jffs2_xattr_datum *xd; 575 576 xd = ref->xd; 577 ref->xseqno |= XREF_DELETE_MARKER; 578 ref->ino = ref->ic->ino; 579 ref->xid = ref->xd->xid; 580 spin_lock(&c->erase_completion_lock); 581 ref->next = c->xref_dead_list; 582 c->xref_dead_list = ref; 583 spin_unlock(&c->erase_completion_lock); 584 585 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 586 ref->ino, ref->xid, ref->xseqno); 587 588 unrefer_xattr_datum(c, xd); 589 } 590 591 void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 592 { 593 /* It's called from jffs2_evict_inode() on inode removing. 594 When an inode with XATTR is removed, those XATTRs must be removed. */ 595 struct jffs2_xattr_ref *ref, *_ref; 596 597 if (!ic || ic->pino_nlink > 0) 598 return; 599 600 down_write(&c->xattr_sem); 601 for (ref = ic->xref; ref; ref = _ref) { 602 _ref = ref->next; 603 delete_xattr_ref(c, ref); 604 } 605 ic->xref = NULL; 606 up_write(&c->xattr_sem); 607 } 608 609 void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 610 { 611 /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 612 struct jffs2_xattr_datum *xd; 613 struct jffs2_xattr_ref *ref, *_ref; 614 615 down_write(&c->xattr_sem); 616 for (ref = ic->xref; ref; ref = _ref) { 617 _ref = ref->next; 618 xd = ref->xd; 619 if (atomic_dec_and_test(&xd->refcnt)) { 620 unload_xattr_datum(c, xd); 621 jffs2_free_xattr_datum(xd); 622 } 623 jffs2_free_xattr_ref(ref); 624 } 625 ic->xref = NULL; 626 up_write(&c->xattr_sem); 627 } 628 629 static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 630 { 631 /* success of check_xattr_ref_inode() means that inode (ic) dose not have 632 * duplicate name/value pairs. If duplicate name/value pair would be found, 633 * one will be removed. 634 */ 635 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 636 int rc = 0; 637 638 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 639 return 0; 640 down_write(&c->xattr_sem); 641 retry: 642 rc = 0; 643 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 644 if (!ref->xd->xname) { 645 rc = load_xattr_datum(c, ref->xd); 646 if (unlikely(rc > 0)) { 647 *pref = ref->next; 648 delete_xattr_ref(c, ref); 649 goto retry; 650 } else if (unlikely(rc < 0)) 651 goto out; 652 } 653 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 654 if (!cmp->xd->xname) { 655 ref->xd->flags |= JFFS2_XFLAGS_BIND; 656 rc = load_xattr_datum(c, cmp->xd); 657 ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 658 if (unlikely(rc > 0)) { 659 *pcmp = cmp->next; 660 delete_xattr_ref(c, cmp); 661 goto retry; 662 } else if (unlikely(rc < 0)) 663 goto out; 664 } 665 if (ref->xd->xprefix == cmp->xd->xprefix 666 && !strcmp(ref->xd->xname, cmp->xd->xname)) { 667 if (ref->xseqno > cmp->xseqno) { 668 *pcmp = cmp->next; 669 delete_xattr_ref(c, cmp); 670 } else { 671 *pref = ref->next; 672 delete_xattr_ref(c, ref); 673 } 674 goto retry; 675 } 676 } 677 } 678 ic->flags |= INO_FLAGS_XATTR_CHECKED; 679 out: 680 up_write(&c->xattr_sem); 681 682 return rc; 683 } 684 685 /* -------- xattr subsystem functions --------------- 686 * jffs2_init_xattr_subsystem(c) 687 * is used to initialize semaphore and list_head, and some variables. 688 * jffs2_find_xattr_datum(c, xid) 689 * is used to lookup xdatum while scanning process. 690 * jffs2_clear_xattr_subsystem(c) 691 * is used to release any xattr related objects. 692 * jffs2_build_xattr_subsystem(c) 693 * is used to associate xdatum and xref while super block building process. 694 * jffs2_setup_xattr_datum(c, xid, version) 695 * is used to insert xdatum while scanning process. 696 * -------------------------------------------------- */ 697 void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 698 { 699 int i; 700 701 for (i=0; i < XATTRINDEX_HASHSIZE; i++) 702 INIT_LIST_HEAD(&c->xattrindex[i]); 703 INIT_LIST_HEAD(&c->xattr_unchecked); 704 INIT_LIST_HEAD(&c->xattr_dead_list); 705 c->xref_dead_list = NULL; 706 c->xref_temp = NULL; 707 708 init_rwsem(&c->xattr_sem); 709 c->highest_xid = 0; 710 c->highest_xseqno = 0; 711 c->xdatum_mem_usage = 0; 712 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 713 } 714 715 static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 716 { 717 struct jffs2_xattr_datum *xd; 718 int i = xid % XATTRINDEX_HASHSIZE; 719 720 /* It's only used in scanning/building process. */ 721 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 722 723 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 724 if (xd->xid==xid) 725 return xd; 726 } 727 return NULL; 728 } 729 730 void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 731 { 732 struct jffs2_xattr_datum *xd, *_xd; 733 struct jffs2_xattr_ref *ref, *_ref; 734 int i; 735 736 for (ref=c->xref_temp; ref; ref = _ref) { 737 _ref = ref->next; 738 jffs2_free_xattr_ref(ref); 739 } 740 741 for (ref=c->xref_dead_list; ref; ref = _ref) { 742 _ref = ref->next; 743 jffs2_free_xattr_ref(ref); 744 } 745 746 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 747 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 748 list_del(&xd->xindex); 749 if (xd->xname) 750 kfree(xd->xname); 751 jffs2_free_xattr_datum(xd); 752 } 753 } 754 755 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 756 list_del(&xd->xindex); 757 jffs2_free_xattr_datum(xd); 758 } 759 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 760 list_del(&xd->xindex); 761 jffs2_free_xattr_datum(xd); 762 } 763 } 764 765 #define XREF_TMPHASH_SIZE (128) 766 void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 767 { 768 struct jffs2_xattr_ref *ref, *_ref; 769 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; 770 struct jffs2_xattr_datum *xd, *_xd; 771 struct jffs2_inode_cache *ic; 772 struct jffs2_raw_node_ref *raw; 773 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 774 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 775 776 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 777 778 /* Phase.1 : Merge same xref */ 779 for (i=0; i < XREF_TMPHASH_SIZE; i++) 780 xref_tmphash[i] = NULL; 781 for (ref=c->xref_temp; ref; ref=_ref) { 782 struct jffs2_xattr_ref *tmp; 783 784 _ref = ref->next; 785 if (ref_flags(ref->node) != REF_PRISTINE) { 786 if (verify_xattr_ref(c, ref)) { 787 BUG_ON(ref->node->next_in_ino != (void *)ref); 788 ref->node->next_in_ino = NULL; 789 jffs2_mark_node_obsolete(c, ref->node); 790 jffs2_free_xattr_ref(ref); 791 continue; 792 } 793 } 794 795 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 796 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 797 if (tmp->ino == ref->ino && tmp->xid == ref->xid) 798 break; 799 } 800 if (tmp) { 801 raw = ref->node; 802 if (ref->xseqno > tmp->xseqno) { 803 tmp->xseqno = ref->xseqno; 804 raw->next_in_ino = tmp->node; 805 tmp->node = raw; 806 } else { 807 raw->next_in_ino = tmp->node->next_in_ino; 808 tmp->node->next_in_ino = raw; 809 } 810 jffs2_free_xattr_ref(ref); 811 continue; 812 } else { 813 ref->next = xref_tmphash[i]; 814 xref_tmphash[i] = ref; 815 } 816 } 817 c->xref_temp = NULL; 818 819 /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 820 for (i=0; i < XREF_TMPHASH_SIZE; i++) { 821 for (ref=xref_tmphash[i]; ref; ref=_ref) { 822 xref_count++; 823 _ref = ref->next; 824 if (is_xattr_ref_dead(ref)) { 825 ref->next = c->xref_dead_list; 826 c->xref_dead_list = ref; 827 xref_dead_count++; 828 continue; 829 } 830 /* At this point, ref->xid and ref->ino contain XID and inode number. 831 ref->xd and ref->ic are not valid yet. */ 832 xd = jffs2_find_xattr_datum(c, ref->xid); 833 ic = jffs2_get_ino_cache(c, ref->ino); 834 if (!xd || !ic || !ic->pino_nlink) { 835 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 836 ref->ino, ref->xid, ref->xseqno); 837 ref->xseqno |= XREF_DELETE_MARKER; 838 ref->next = c->xref_dead_list; 839 c->xref_dead_list = ref; 840 xref_orphan_count++; 841 continue; 842 } 843 ref->xd = xd; 844 ref->ic = ic; 845 atomic_inc(&xd->refcnt); 846 ref->next = ic->xref; 847 ic->xref = ref; 848 } 849 } 850 851 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 852 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 853 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 854 xdatum_count++; 855 list_del_init(&xd->xindex); 856 if (!atomic_read(&xd->refcnt)) { 857 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 858 xd->xid, xd->version); 859 xd->flags |= JFFS2_XFLAGS_DEAD; 860 list_add(&xd->xindex, &c->xattr_unchecked); 861 xdatum_orphan_count++; 862 continue; 863 } 864 if (is_xattr_datum_unchecked(c, xd)) { 865 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 866 xd->xid, xd->version); 867 list_add(&xd->xindex, &c->xattr_unchecked); 868 xdatum_unchecked_count++; 869 } 870 } 871 } 872 /* build complete */ 873 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 874 " (%u unchecked, %u orphan) and " 875 "%u of xref (%u dead, %u orphan) found.\n", 876 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 877 xref_count, xref_dead_count, xref_orphan_count); 878 } 879 880 struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 881 uint32_t xid, uint32_t version) 882 { 883 struct jffs2_xattr_datum *xd; 884 885 xd = jffs2_find_xattr_datum(c, xid); 886 if (!xd) { 887 xd = jffs2_alloc_xattr_datum(); 888 if (!xd) 889 return ERR_PTR(-ENOMEM); 890 xd->xid = xid; 891 xd->version = version; 892 if (xd->xid > c->highest_xid) 893 c->highest_xid = xd->xid; 894 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 895 } 896 return xd; 897 } 898 899 /* -------- xattr subsystem functions --------------- 900 * xprefix_to_handler(xprefix) 901 * is used to translate xprefix into xattr_handler. 902 * jffs2_listxattr(dentry, buffer, size) 903 * is an implementation of listxattr handler on jffs2. 904 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 905 * is an implementation of getxattr handler on jffs2. 906 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 907 * is an implementation of setxattr handler on jffs2. 908 * -------------------------------------------------- */ 909 const struct xattr_handler *jffs2_xattr_handlers[] = { 910 &jffs2_user_xattr_handler, 911 #ifdef CONFIG_JFFS2_FS_SECURITY 912 &jffs2_security_xattr_handler, 913 #endif 914 #ifdef CONFIG_JFFS2_FS_POSIX_ACL 915 &jffs2_acl_access_xattr_handler, 916 &jffs2_acl_default_xattr_handler, 917 #endif 918 &jffs2_trusted_xattr_handler, 919 NULL 920 }; 921 922 static const struct xattr_handler *xprefix_to_handler(int xprefix) { 923 const struct xattr_handler *ret; 924 925 switch (xprefix) { 926 case JFFS2_XPREFIX_USER: 927 ret = &jffs2_user_xattr_handler; 928 break; 929 #ifdef CONFIG_JFFS2_FS_SECURITY 930 case JFFS2_XPREFIX_SECURITY: 931 ret = &jffs2_security_xattr_handler; 932 break; 933 #endif 934 #ifdef CONFIG_JFFS2_FS_POSIX_ACL 935 case JFFS2_XPREFIX_ACL_ACCESS: 936 ret = &jffs2_acl_access_xattr_handler; 937 break; 938 case JFFS2_XPREFIX_ACL_DEFAULT: 939 ret = &jffs2_acl_default_xattr_handler; 940 break; 941 #endif 942 case JFFS2_XPREFIX_TRUSTED: 943 ret = &jffs2_trusted_xattr_handler; 944 break; 945 default: 946 ret = NULL; 947 break; 948 } 949 return ret; 950 } 951 952 ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 953 { 954 struct inode *inode = dentry->d_inode; 955 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 956 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 957 struct jffs2_inode_cache *ic = f->inocache; 958 struct jffs2_xattr_ref *ref, **pref; 959 struct jffs2_xattr_datum *xd; 960 const struct xattr_handler *xhandle; 961 ssize_t len, rc; 962 int retry = 0; 963 964 rc = check_xattr_ref_inode(c, ic); 965 if (unlikely(rc)) 966 return rc; 967 968 down_read(&c->xattr_sem); 969 retry: 970 len = 0; 971 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 972 BUG_ON(ref->ic != ic); 973 xd = ref->xd; 974 if (!xd->xname) { 975 /* xdatum is unchached */ 976 if (!retry) { 977 retry = 1; 978 up_read(&c->xattr_sem); 979 down_write(&c->xattr_sem); 980 goto retry; 981 } else { 982 rc = load_xattr_datum(c, xd); 983 if (unlikely(rc > 0)) { 984 *pref = ref->next; 985 delete_xattr_ref(c, ref); 986 goto retry; 987 } else if (unlikely(rc < 0)) 988 goto out; 989 } 990 } 991 xhandle = xprefix_to_handler(xd->xprefix); 992 if (!xhandle) 993 continue; 994 if (buffer) { 995 rc = xhandle->list(dentry, buffer+len, size-len, 996 xd->xname, xd->name_len, xd->flags); 997 } else { 998 rc = xhandle->list(dentry, NULL, 0, xd->xname, 999 xd->name_len, xd->flags); 1000 } 1001 if (rc < 0) 1002 goto out; 1003 len += rc; 1004 } 1005 rc = len; 1006 out: 1007 if (!retry) { 1008 up_read(&c->xattr_sem); 1009 } else { 1010 up_write(&c->xattr_sem); 1011 } 1012 return rc; 1013 } 1014 1015 int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1016 char *buffer, size_t size) 1017 { 1018 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1019 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1020 struct jffs2_inode_cache *ic = f->inocache; 1021 struct jffs2_xattr_datum *xd; 1022 struct jffs2_xattr_ref *ref, **pref; 1023 int rc, retry = 0; 1024 1025 rc = check_xattr_ref_inode(c, ic); 1026 if (unlikely(rc)) 1027 return rc; 1028 1029 down_read(&c->xattr_sem); 1030 retry: 1031 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1032 BUG_ON(ref->ic!=ic); 1033 1034 xd = ref->xd; 1035 if (xd->xprefix != xprefix) 1036 continue; 1037 if (!xd->xname) { 1038 /* xdatum is unchached */ 1039 if (!retry) { 1040 retry = 1; 1041 up_read(&c->xattr_sem); 1042 down_write(&c->xattr_sem); 1043 goto retry; 1044 } else { 1045 rc = load_xattr_datum(c, xd); 1046 if (unlikely(rc > 0)) { 1047 *pref = ref->next; 1048 delete_xattr_ref(c, ref); 1049 goto retry; 1050 } else if (unlikely(rc < 0)) { 1051 goto out; 1052 } 1053 } 1054 } 1055 if (!strcmp(xname, xd->xname)) { 1056 rc = xd->value_len; 1057 if (buffer) { 1058 if (size < rc) { 1059 rc = -ERANGE; 1060 } else { 1061 memcpy(buffer, xd->xvalue, rc); 1062 } 1063 } 1064 goto out; 1065 } 1066 } 1067 rc = -ENODATA; 1068 out: 1069 if (!retry) { 1070 up_read(&c->xattr_sem); 1071 } else { 1072 up_write(&c->xattr_sem); 1073 } 1074 return rc; 1075 } 1076 1077 int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1078 const char *buffer, size_t size, int flags) 1079 { 1080 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1081 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1082 struct jffs2_inode_cache *ic = f->inocache; 1083 struct jffs2_xattr_datum *xd; 1084 struct jffs2_xattr_ref *ref, *newref, **pref; 1085 uint32_t length, request; 1086 int rc; 1087 1088 rc = check_xattr_ref_inode(c, ic); 1089 if (unlikely(rc)) 1090 return rc; 1091 1092 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 1093 rc = jffs2_reserve_space(c, request, &length, 1094 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1095 if (rc) { 1096 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1097 return rc; 1098 } 1099 1100 /* Find existing xattr */ 1101 down_write(&c->xattr_sem); 1102 retry: 1103 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1104 xd = ref->xd; 1105 if (xd->xprefix != xprefix) 1106 continue; 1107 if (!xd->xname) { 1108 rc = load_xattr_datum(c, xd); 1109 if (unlikely(rc > 0)) { 1110 *pref = ref->next; 1111 delete_xattr_ref(c, ref); 1112 goto retry; 1113 } else if (unlikely(rc < 0)) 1114 goto out; 1115 } 1116 if (!strcmp(xd->xname, xname)) { 1117 if (flags & XATTR_CREATE) { 1118 rc = -EEXIST; 1119 goto out; 1120 } 1121 if (!buffer) { 1122 ref->ino = ic->ino; 1123 ref->xid = xd->xid; 1124 ref->xseqno |= XREF_DELETE_MARKER; 1125 rc = save_xattr_ref(c, ref); 1126 if (!rc) { 1127 *pref = ref->next; 1128 spin_lock(&c->erase_completion_lock); 1129 ref->next = c->xref_dead_list; 1130 c->xref_dead_list = ref; 1131 spin_unlock(&c->erase_completion_lock); 1132 unrefer_xattr_datum(c, xd); 1133 } else { 1134 ref->ic = ic; 1135 ref->xd = xd; 1136 ref->xseqno &= ~XREF_DELETE_MARKER; 1137 } 1138 goto out; 1139 } 1140 goto found; 1141 } 1142 } 1143 /* not found */ 1144 if (flags & XATTR_REPLACE) { 1145 rc = -ENODATA; 1146 goto out; 1147 } 1148 if (!buffer) { 1149 rc = -ENODATA; 1150 goto out; 1151 } 1152 found: 1153 xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1154 if (IS_ERR(xd)) { 1155 rc = PTR_ERR(xd); 1156 goto out; 1157 } 1158 up_write(&c->xattr_sem); 1159 jffs2_complete_reservation(c); 1160 1161 /* create xattr_ref */ 1162 request = PAD(sizeof(struct jffs2_raw_xref)); 1163 rc = jffs2_reserve_space(c, request, &length, 1164 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1165 down_write(&c->xattr_sem); 1166 if (rc) { 1167 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1168 unrefer_xattr_datum(c, xd); 1169 up_write(&c->xattr_sem); 1170 return rc; 1171 } 1172 if (ref) 1173 *pref = ref->next; 1174 newref = create_xattr_ref(c, ic, xd); 1175 if (IS_ERR(newref)) { 1176 if (ref) { 1177 ref->next = ic->xref; 1178 ic->xref = ref; 1179 } 1180 rc = PTR_ERR(newref); 1181 unrefer_xattr_datum(c, xd); 1182 } else if (ref) { 1183 delete_xattr_ref(c, ref); 1184 } 1185 out: 1186 up_write(&c->xattr_sem); 1187 jffs2_complete_reservation(c); 1188 return rc; 1189 } 1190 1191 /* -------- garbage collector functions ------------- 1192 * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1193 * is used to move xdatum into new node. 1194 * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1195 * is used to move xref into new node. 1196 * jffs2_verify_xattr(c) 1197 * is used to call do_verify_xattr_datum() before garbage collecting. 1198 * jffs2_release_xattr_datum(c, xd) 1199 * is used to release an in-memory object of xdatum. 1200 * jffs2_release_xattr_ref(c, ref) 1201 * is used to release an in-memory object of xref. 1202 * -------------------------------------------------- */ 1203 int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1204 struct jffs2_raw_node_ref *raw) 1205 { 1206 uint32_t totlen, length, old_ofs; 1207 int rc = 0; 1208 1209 down_write(&c->xattr_sem); 1210 if (xd->node != raw) 1211 goto out; 1212 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1213 goto out; 1214 1215 rc = load_xattr_datum(c, xd); 1216 if (unlikely(rc)) { 1217 rc = (rc > 0) ? 0 : rc; 1218 goto out; 1219 } 1220 old_ofs = ref_offset(xd->node); 1221 totlen = PAD(sizeof(struct jffs2_raw_xattr) 1222 + xd->name_len + 1 + xd->value_len); 1223 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1224 if (rc) { 1225 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1226 goto out; 1227 } 1228 rc = save_xattr_datum(c, xd); 1229 if (!rc) 1230 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1231 xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1232 out: 1233 if (!rc) 1234 jffs2_mark_node_obsolete(c, raw); 1235 up_write(&c->xattr_sem); 1236 return rc; 1237 } 1238 1239 int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1240 struct jffs2_raw_node_ref *raw) 1241 { 1242 uint32_t totlen, length, old_ofs; 1243 int rc = 0; 1244 1245 down_write(&c->xattr_sem); 1246 BUG_ON(!ref->node); 1247 1248 if (ref->node != raw) 1249 goto out; 1250 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1251 goto out; 1252 1253 old_ofs = ref_offset(ref->node); 1254 totlen = ref_totlen(c, c->gcblock, ref->node); 1255 1256 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1257 if (rc) { 1258 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 1259 __func__, rc, totlen); 1260 rc = rc ? rc : -EBADFD; 1261 goto out; 1262 } 1263 rc = save_xattr_ref(c, ref); 1264 if (!rc) 1265 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1266 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1267 out: 1268 if (!rc) 1269 jffs2_mark_node_obsolete(c, raw); 1270 up_write(&c->xattr_sem); 1271 return rc; 1272 } 1273 1274 int jffs2_verify_xattr(struct jffs2_sb_info *c) 1275 { 1276 struct jffs2_xattr_datum *xd, *_xd; 1277 struct jffs2_eraseblock *jeb; 1278 struct jffs2_raw_node_ref *raw; 1279 uint32_t totlen; 1280 int rc; 1281 1282 down_write(&c->xattr_sem); 1283 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1284 rc = do_verify_xattr_datum(c, xd); 1285 if (rc < 0) 1286 continue; 1287 list_del_init(&xd->xindex); 1288 spin_lock(&c->erase_completion_lock); 1289 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1290 if (ref_flags(raw) != REF_UNCHECKED) 1291 continue; 1292 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1293 totlen = PAD(ref_totlen(c, jeb, raw)); 1294 c->unchecked_size -= totlen; c->used_size += totlen; 1295 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1296 raw->flash_offset = ref_offset(raw) 1297 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1298 } 1299 if (xd->flags & JFFS2_XFLAGS_DEAD) 1300 list_add(&xd->xindex, &c->xattr_dead_list); 1301 spin_unlock(&c->erase_completion_lock); 1302 } 1303 up_write(&c->xattr_sem); 1304 return list_empty(&c->xattr_unchecked) ? 1 : 0; 1305 } 1306 1307 void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1308 { 1309 /* must be called under spin_lock(&c->erase_completion_lock) */ 1310 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1311 return; 1312 1313 list_del(&xd->xindex); 1314 jffs2_free_xattr_datum(xd); 1315 } 1316 1317 void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1318 { 1319 /* must be called under spin_lock(&c->erase_completion_lock) */ 1320 struct jffs2_xattr_ref *tmp, **ptmp; 1321 1322 if (ref->node != (void *)ref) 1323 return; 1324 1325 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1326 if (ref == tmp) { 1327 *ptmp = tmp->next; 1328 break; 1329 } 1330 } 1331 jffs2_free_xattr_ref(ref); 1332 } 1333