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#define JFFS2_XATTR_IS_CORRUPTED 1 15 16#include <linux/kernel.h> 17#include <linux/slab.h> 18#include <linux/fs.h> 19#include <linux/time.h> 20#include <linux/pagemap.h> 21#include <linux/highmem.h> 22#include <linux/crc32.h> 23#include <linux/jffs2.h> 24#include <linux/xattr.h> 25#include <linux/posix_acl_xattr.h> 26#include <linux/mtd/mtd.h> 27#include "nodelist.h" 28/* -------- xdatum related functions ---------------- 29 * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 30 * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 31 * the index of the xattr name/value pair cache (c->xattrindex). 32 * is_xattr_datum_unchecked(c, xd) 33 * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 34 * unchecked, it returns 0. 35 * unload_xattr_datum(c, xd) 36 * is used to release xattr name/value pair and detach from c->xattrindex. 37 * reclaim_xattr_datum(c) 38 * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 39 * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold 40 * is hard coded as 32KiB. 41 * do_verify_xattr_datum(c, xd) 42 * is used to load the xdatum informations without name/value pair from the medium. 43 * It's necessary once, because those informations are not collected during mounting 44 * process when EBS is enabled. 45 * 0 will be returned, if success. An negative return value means recoverable error, and 46 * positive return value means unrecoverable error. Thus, caller must remove this xdatum 47 * and xref when it returned positive value. 48 * do_load_xattr_datum(c, xd) 49 * is used to load name/value pair from the medium. 50 * The meanings of return value is same as do_verify_xattr_datum(). 51 * load_xattr_datum(c, xd) 52 * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 53 * If xd need to call do_verify_xattr_datum() at first, it's called before calling 54 * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 55 * save_xattr_datum(c, xd) 56 * is used to write xdatum to medium. xd->version will be incremented. 57 * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 58 * is used to create new xdatum and write to medium. 59 * unrefer_xattr_datum(c, xd) 60 * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD 61 * is set on xd->flags and chained xattr_dead_list or release it immediately. 62 * In the first case, the garbage collector release it later. 63 * -------------------------------------------------- */ 64static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 65{ 66 int name_len = strlen(xname); 67 68 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 69} 70 71static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 72{ 73 struct jffs2_raw_node_ref *raw; 74 int rc = 0; 75 76 spin_lock(&c->erase_completion_lock); 77 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 78 if (ref_flags(raw) == REF_UNCHECKED) { 79 rc = 1; 80 break; 81 } 82 } 83 spin_unlock(&c->erase_completion_lock); 84 return rc; 85} 86 87static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 88{ 89 /* must be called under down_write(xattr_sem) */ 90 D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); 91 if (xd->xname) { 92 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 93 kfree(xd->xname); 94 } 95 96 list_del_init(&xd->xindex); 97 xd->hashkey = 0; 98 xd->xname = NULL; 99 xd->xvalue = NULL; 100} 101 102static void reclaim_xattr_datum(struct jffs2_sb_info *c) 103{ 104 /* must be called under down_write(xattr_sem) */ 105 struct jffs2_xattr_datum *xd, *_xd; 106 uint32_t target, before; 107 static int index = 0; 108 int count; 109 110 if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 111 return; 112 113 before = c->xdatum_mem_usage; 114 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 115 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 116 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 117 if (xd->flags & JFFS2_XFLAGS_HOT) { 118 xd->flags &= ~JFFS2_XFLAGS_HOT; 119 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 120 unload_xattr_datum(c, xd); 121 } 122 if (c->xdatum_mem_usage <= target) 123 goto out; 124 } 125 index = (index+1) % XATTRINDEX_HASHSIZE; 126 } 127 out: 128 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 129 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 130} 131 132static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 133{ 134 /* must be called under down_write(xattr_sem) */ 135 struct jffs2_eraseblock *jeb; 136 struct jffs2_raw_node_ref *raw; 137 struct jffs2_raw_xattr rx; 138 size_t readlen; 139 uint32_t crc, offset, totlen; 140 int rc; 141 142 spin_lock(&c->erase_completion_lock); 143 offset = ref_offset(xd->node); 144 if (ref_flags(xd->node) == REF_PRISTINE) 145 goto complete; 146 spin_unlock(&c->erase_completion_lock); 147 148 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 149 if (rc || readlen != sizeof(rx)) { 150 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 151 rc, sizeof(rx), readlen, offset); 152 return rc ? rc : -EIO; 153 } 154 crc = crc32(0, &rx, sizeof(rx) - 4); 155 if (crc != je32_to_cpu(rx.node_crc)) { 156 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 157 offset, je32_to_cpu(rx.hdr_crc), crc); 158 xd->flags |= JFFS2_XFLAGS_INVALID; 159 return JFFS2_XATTR_IS_CORRUPTED; 160 } 161 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 162 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 163 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 164 || je32_to_cpu(rx.totlen) != totlen 165 || je32_to_cpu(rx.xid) != xd->xid 166 || je32_to_cpu(rx.version) != xd->version) { 167 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 168 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 169 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, 170 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, 171 je32_to_cpu(rx.totlen), totlen, 172 je32_to_cpu(rx.xid), xd->xid, 173 je32_to_cpu(rx.version), xd->version); 174 xd->flags |= JFFS2_XFLAGS_INVALID; 175 return JFFS2_XATTR_IS_CORRUPTED; 176 } 177 xd->xprefix = rx.xprefix; 178 xd->name_len = rx.name_len; 179 xd->value_len = je16_to_cpu(rx.value_len); 180 xd->data_crc = je32_to_cpu(rx.data_crc); 181 182 spin_lock(&c->erase_completion_lock); 183 complete: 184 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 185 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 186 totlen = PAD(ref_totlen(c, jeb, raw)); 187 if (ref_flags(raw) == REF_UNCHECKED) { 188 c->unchecked_size -= totlen; c->used_size += totlen; 189 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 190 } 191 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 192 } 193 spin_unlock(&c->erase_completion_lock); 194 195 /* unchecked xdatum is chained with c->xattr_unchecked */ 196 list_del_init(&xd->xindex); 197 198 dbg_xattr("success on verifying xdatum (xid=%u, version=%u)\n", 199 xd->xid, xd->version); 200 201 return 0; 202} 203 204static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 205{ 206 /* must be called under down_write(xattr_sem) */ 207 char *data; 208 size_t readlen; 209 uint32_t crc, length; 210 int i, ret, retry = 0; 211 212 BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 213 BUG_ON(!list_empty(&xd->xindex)); 214 retry: 215 length = xd->name_len + 1 + xd->value_len; 216 data = kmalloc(length, GFP_KERNEL); 217 if (!data) 218 return -ENOMEM; 219 220 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 221 length, &readlen, data); 222 223 if (ret || length!=readlen) { 224 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 225 ret, length, readlen, ref_offset(xd->node)); 226 kfree(data); 227 return ret ? ret : -EIO; 228 } 229 230 data[xd->name_len] = '\0'; 231 crc = crc32(0, data, length); 232 if (crc != xd->data_crc) { 233 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XATTR)" 234 " at %#08x, read: 0x%08x calculated: 0x%08x\n", 235 ref_offset(xd->node), xd->data_crc, crc); 236 kfree(data); 237 xd->flags |= JFFS2_XFLAGS_INVALID; 238 return JFFS2_XATTR_IS_CORRUPTED; 239 } 240 241 xd->flags |= JFFS2_XFLAGS_HOT; 242 xd->xname = data; 243 xd->xvalue = data + xd->name_len+1; 244 245 c->xdatum_mem_usage += length; 246 247 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 248 i = xd->hashkey % XATTRINDEX_HASHSIZE; 249 list_add(&xd->xindex, &c->xattrindex[i]); 250 if (!retry) { 251 retry = 1; 252 reclaim_xattr_datum(c); 253 if (!xd->xname) 254 goto retry; 255 } 256 257 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 258 xd->xid, xd->xprefix, xd->xname); 259 260 return 0; 261} 262 263static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 264{ 265 /* must be called under down_write(xattr_sem); 266 * rc < 0 : recoverable error, try again 267 * rc = 0 : success 268 * rc > 0 : Unrecoverable error, this node should be deleted. 269 */ 270 int rc = 0; 271 272 BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 273 if (xd->xname) 274 return 0; 275 if (xd->flags & JFFS2_XFLAGS_INVALID) 276 return JFFS2_XATTR_IS_CORRUPTED; 277 if (unlikely(is_xattr_datum_unchecked(c, xd))) 278 rc = do_verify_xattr_datum(c, xd); 279 if (!rc) 280 rc = do_load_xattr_datum(c, xd); 281 return rc; 282} 283 284static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 285{ 286 /* must be called under down_write(xattr_sem) */ 287 struct jffs2_raw_xattr rx; 288 struct kvec vecs[2]; 289 size_t length; 290 int rc, totlen; 291 uint32_t phys_ofs = write_ofs(c); 292 293 BUG_ON(!xd->xname); 294 BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 295 296 vecs[0].iov_base = ℞ 297 vecs[0].iov_len = sizeof(rx); 298 vecs[1].iov_base = xd->xname; 299 vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 300 totlen = vecs[0].iov_len + vecs[1].iov_len; 301 302 /* Setup raw-xattr */ 303 memset(&rx, 0, sizeof(rx)); 304 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 305 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 306 rx.totlen = cpu_to_je32(PAD(totlen)); 307 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 308 309 rx.xid = cpu_to_je32(xd->xid); 310 rx.version = cpu_to_je32(++xd->version); 311 rx.xprefix = xd->xprefix; 312 rx.name_len = xd->name_len; 313 rx.value_len = cpu_to_je16(xd->value_len); 314 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 315 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 316 317 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 318 if (rc || totlen != length) { 319 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 320 rc, totlen, length, phys_ofs); 321 rc = rc ? rc : -EIO; 322 if (length) 323 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 324 325 return rc; 326 } 327 /* success */ 328 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 329 330 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 331 xd->xid, xd->version, xd->xprefix, xd->xname); 332 333 return 0; 334} 335 336static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 337 int xprefix, const char *xname, 338 const char *xvalue, int xsize) 339{ 340 /* must be called under down_write(xattr_sem) */ 341 struct jffs2_xattr_datum *xd; 342 uint32_t hashkey, name_len; 343 char *data; 344 int i, rc; 345 346 /* Search xattr_datum has same xname/xvalue by index */ 347 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 348 i = hashkey % XATTRINDEX_HASHSIZE; 349 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 350 if (xd->hashkey==hashkey 351 && xd->xprefix==xprefix 352 && xd->value_len==xsize 353 && !strcmp(xd->xname, xname) 354 && !memcmp(xd->xvalue, xvalue, xsize)) { 355 atomic_inc(&xd->refcnt); 356 return xd; 357 } 358 } 359 360 /* Not found, Create NEW XATTR-Cache */ 361 name_len = strlen(xname); 362 363 xd = jffs2_alloc_xattr_datum(); 364 if (!xd) 365 return ERR_PTR(-ENOMEM); 366 367 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 368 if (!data) { 369 jffs2_free_xattr_datum(xd); 370 return ERR_PTR(-ENOMEM); 371 } 372 strcpy(data, xname); 373 memcpy(data + name_len + 1, xvalue, xsize); 374 375 atomic_set(&xd->refcnt, 1); 376 xd->xid = ++c->highest_xid; 377 xd->flags |= JFFS2_XFLAGS_HOT; 378 xd->xprefix = xprefix; 379 380 xd->hashkey = hashkey; 381 xd->xname = data; 382 xd->xvalue = data + name_len + 1; 383 xd->name_len = name_len; 384 xd->value_len = xsize; 385 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 386 387 rc = save_xattr_datum(c, xd); 388 if (rc) { 389 kfree(xd->xname); 390 jffs2_free_xattr_datum(xd); 391 return ERR_PTR(rc); 392 } 393 394 /* Insert Hash Index */ 395 i = hashkey % XATTRINDEX_HASHSIZE; 396 list_add(&xd->xindex, &c->xattrindex[i]); 397 398 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 399 reclaim_xattr_datum(c); 400 401 return xd; 402} 403 404static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 405{ 406 /* must be called under down_write(xattr_sem) */ 407 if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { 408 unload_xattr_datum(c, xd); 409 xd->flags |= JFFS2_XFLAGS_DEAD; 410 if (xd->node == (void *)xd) { 411 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); 412 jffs2_free_xattr_datum(xd); 413 } else { 414 list_add(&xd->xindex, &c->xattr_dead_list); 415 } 416 spin_unlock(&c->erase_completion_lock); 417 418 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", 419 xd->xid, xd->version); 420 } 421} 422 423/* -------- xref related functions ------------------ 424 * verify_xattr_ref(c, ref) 425 * is used to load xref information from medium. Because summary data does not 426 * contain xid/ino, it's necessary to verify once while mounting process. 427 * save_xattr_ref(c, ref) 428 * is used to write xref to medium. If delete marker is marked, it write 429 * a delete marker of xref into medium. 430 * create_xattr_ref(c, ic, xd) 431 * is used to create a new xref and write to medium. 432 * delete_xattr_ref(c, ref) 433 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 434 * and allows GC to reclaim those physical nodes. 435 * jffs2_xattr_delete_inode(c, ic) 436 * is called to remove xrefs related to obsolete inode when inode is unlinked. 437 * jffs2_xattr_free_inode(c, ic) 438 * is called to release xattr related objects when unmounting. 439 * check_xattr_ref_inode(c, ic) 440 * is used to confirm inode does not have duplicate xattr name/value pair. 441 * jffs2_xattr_do_crccheck_inode(c, ic) 442 * is used to force xattr data integrity check during the initial gc scan. 443 * -------------------------------------------------- */ 444static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 445{ 446 struct jffs2_eraseblock *jeb; 447 struct jffs2_raw_node_ref *raw; 448 struct jffs2_raw_xref rr; 449 size_t readlen; 450 uint32_t crc, offset, totlen; 451 int rc; 452 453 spin_lock(&c->erase_completion_lock); 454 if (ref_flags(ref->node) != REF_UNCHECKED) 455 goto complete; 456 offset = ref_offset(ref->node); 457 spin_unlock(&c->erase_completion_lock); 458 459 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 460 if (rc || sizeof(rr) != readlen) { 461 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 462 rc, sizeof(rr), readlen, offset); 463 return rc ? rc : -EIO; 464 } 465 /* obsolete node */ 466 crc = crc32(0, &rr, sizeof(rr) - 4); 467 if (crc != je32_to_cpu(rr.node_crc)) { 468 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 469 offset, je32_to_cpu(rr.node_crc), crc); 470 return JFFS2_XATTR_IS_CORRUPTED; 471 } 472 if (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 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 476 "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 477 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 478 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 479 je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 480 return JFFS2_XATTR_IS_CORRUPTED; 481 } 482 ref->ino = je32_to_cpu(rr.ino); 483 ref->xid = je32_to_cpu(rr.xid); 484 ref->xseqno = je32_to_cpu(rr.xseqno); 485 if (ref->xseqno > c->highest_xseqno) 486 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 487 488 spin_lock(&c->erase_completion_lock); 489 complete: 490 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 491 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 492 totlen = PAD(ref_totlen(c, jeb, raw)); 493 if (ref_flags(raw) == REF_UNCHECKED) { 494 c->unchecked_size -= totlen; c->used_size += totlen; 495 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 496 } 497 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 498 } 499 spin_unlock(&c->erase_completion_lock); 500 501 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 502 ref->ino, ref->xid, ref_offset(ref->node)); 503 return 0; 504} 505 506static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 507{ 508 /* must be called under down_write(xattr_sem) */ 509 struct jffs2_raw_xref rr; 510 size_t length; 511 uint32_t xseqno, phys_ofs = write_ofs(c); 512 int ret; 513 514 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 515 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 516 rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 517 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 518 519 xseqno = (c->highest_xseqno += 2); 520 if (is_xattr_ref_dead(ref)) { 521 xseqno |= XREF_DELETE_MARKER; 522 rr.ino = cpu_to_je32(ref->ino); 523 rr.xid = cpu_to_je32(ref->xid); 524 } else { 525 rr.ino = cpu_to_je32(ref->ic->ino); 526 rr.xid = cpu_to_je32(ref->xd->xid); 527 } 528 rr.xseqno = cpu_to_je32(xseqno); 529 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 530 531 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 532 if (ret || sizeof(rr) != length) { 533 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 534 ret, sizeof(rr), length, phys_ofs); 535 ret = ret ? ret : -EIO; 536 if (length) 537 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 538 539 return ret; 540 } 541 /* success */ 542 ref->xseqno = xseqno; 543 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 544 545 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 546 547 return 0; 548} 549 550static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 551 struct jffs2_xattr_datum *xd) 552{ 553 /* must be called under down_write(xattr_sem) */ 554 struct jffs2_xattr_ref *ref; 555 int ret; 556 557 ref = jffs2_alloc_xattr_ref(); 558 if (!ref) 559 return ERR_PTR(-ENOMEM); 560 ref->ic = ic; 561 ref->xd = xd; 562 563 ret = save_xattr_ref(c, ref); 564 if (ret) { 565 jffs2_free_xattr_ref(ref); 566 return ERR_PTR(ret); 567 } 568 569 /* Chain to inode */ 570 ref->next = ic->xref; 571 ic->xref = ref; 572 573 return ref; /* success */ 574} 575 576static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 577{ 578 /* must be called under down_write(xattr_sem) */ 579 struct jffs2_xattr_datum *xd; 580 581 xd = ref->xd; 582 ref->xseqno |= XREF_DELETE_MARKER; 583 ref->ino = ref->ic->ino; 584 ref->xid = ref->xd->xid; 585 spin_lock(&c->erase_completion_lock); 586 ref->next = c->xref_dead_list; 587 c->xref_dead_list = ref; 588 spin_unlock(&c->erase_completion_lock); 589 590 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 591 ref->ino, ref->xid, ref->xseqno); 592 593 unrefer_xattr_datum(c, xd); 594} 595 596void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 597{ 598 /* It's called from jffs2_evict_inode() on inode removing. 599 When an inode with XATTR is removed, those XATTRs must be removed. */ 600 struct jffs2_xattr_ref *ref, *_ref; 601 602 if (!ic || ic->pino_nlink > 0) 603 return; 604 605 down_write(&c->xattr_sem); 606 for (ref = ic->xref; ref; ref = _ref) { 607 _ref = ref->next; 608 delete_xattr_ref(c, ref); 609 } 610 ic->xref = NULL; 611 up_write(&c->xattr_sem); 612} 613 614void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 615{ 616 /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 617 struct jffs2_xattr_datum *xd; 618 struct jffs2_xattr_ref *ref, *_ref; 619 620 down_write(&c->xattr_sem); 621 for (ref = ic->xref; ref; ref = _ref) { 622 _ref = ref->next; 623 xd = ref->xd; 624 if (atomic_dec_and_test(&xd->refcnt)) { 625 unload_xattr_datum(c, xd); 626 jffs2_free_xattr_datum(xd); 627 } 628 jffs2_free_xattr_ref(ref); 629 } 630 ic->xref = NULL; 631 up_write(&c->xattr_sem); 632} 633 634static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 635{ 636 /* success of check_xattr_ref_inode() means that inode (ic) dose not have 637 * duplicate name/value pairs. If duplicate name/value pair would be found, 638 * one will be removed. 639 */ 640 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 641 int rc = 0; 642 643 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 644 return 0; 645 down_write(&c->xattr_sem); 646 retry: 647 rc = 0; 648 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 649 if (!ref->xd->xname) { 650 rc = load_xattr_datum(c, ref->xd); 651 if (unlikely(rc > 0)) { 652 *pref = ref->next; 653 delete_xattr_ref(c, ref); 654 goto retry; 655 } else if (unlikely(rc < 0)) 656 goto out; 657 } 658 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 659 if (!cmp->xd->xname) { 660 ref->xd->flags |= JFFS2_XFLAGS_BIND; 661 rc = load_xattr_datum(c, cmp->xd); 662 ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 663 if (unlikely(rc > 0)) { 664 *pcmp = cmp->next; 665 delete_xattr_ref(c, cmp); 666 goto retry; 667 } else if (unlikely(rc < 0)) 668 goto out; 669 } 670 if (ref->xd->xprefix == cmp->xd->xprefix 671 && !strcmp(ref->xd->xname, cmp->xd->xname)) { 672 if (ref->xseqno > cmp->xseqno) { 673 *pcmp = cmp->next; 674 delete_xattr_ref(c, cmp); 675 } else { 676 *pref = ref->next; 677 delete_xattr_ref(c, ref); 678 } 679 goto retry; 680 } 681 } 682 } 683 ic->flags |= INO_FLAGS_XATTR_CHECKED; 684 out: 685 up_write(&c->xattr_sem); 686 687 return rc; 688} 689 690void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 691{ 692 check_xattr_ref_inode(c, ic); 693} 694 695/* -------- xattr subsystem functions --------------- 696 * jffs2_init_xattr_subsystem(c) 697 * is used to initialize semaphore and list_head, and some variables. 698 * jffs2_find_xattr_datum(c, xid) 699 * is used to lookup xdatum while scanning process. 700 * jffs2_clear_xattr_subsystem(c) 701 * is used to release any xattr related objects. 702 * jffs2_build_xattr_subsystem(c) 703 * is used to associate xdatum and xref while super block building process. 704 * jffs2_setup_xattr_datum(c, xid, version) 705 * is used to insert xdatum while scanning process. 706 * -------------------------------------------------- */ 707void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 708{ 709 int i; 710 711 for (i=0; i < XATTRINDEX_HASHSIZE; i++) 712 INIT_LIST_HEAD(&c->xattrindex[i]); 713 INIT_LIST_HEAD(&c->xattr_unchecked); 714 INIT_LIST_HEAD(&c->xattr_dead_list); 715 c->xref_dead_list = NULL; 716 c->xref_temp = NULL; 717 718 init_rwsem(&c->xattr_sem); 719 c->highest_xid = 0; 720 c->highest_xseqno = 0; 721 c->xdatum_mem_usage = 0; 722 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 723} 724 725static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 726{ 727 struct jffs2_xattr_datum *xd; 728 int i = xid % XATTRINDEX_HASHSIZE; 729 730 /* It's only used in scanning/building process. */ 731 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 732 733 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 734 if (xd->xid==xid) 735 return xd; 736 } 737 return NULL; 738} 739 740void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 741{ 742 struct jffs2_xattr_datum *xd, *_xd; 743 struct jffs2_xattr_ref *ref, *_ref; 744 int i; 745 746 for (ref=c->xref_temp; ref; ref = _ref) { 747 _ref = ref->next; 748 jffs2_free_xattr_ref(ref); 749 } 750 751 for (ref=c->xref_dead_list; ref; ref = _ref) { 752 _ref = ref->next; 753 jffs2_free_xattr_ref(ref); 754 } 755 756 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 757 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 758 list_del(&xd->xindex); 759 kfree(xd->xname); 760 jffs2_free_xattr_datum(xd); 761 } 762 } 763 764 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 765 list_del(&xd->xindex); 766 jffs2_free_xattr_datum(xd); 767 } 768 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 769 list_del(&xd->xindex); 770 jffs2_free_xattr_datum(xd); 771 } 772} 773 774#define XREF_TMPHASH_SIZE (128) 775void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 776{ 777 struct jffs2_xattr_ref *ref, *_ref; 778 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; 779 struct jffs2_xattr_datum *xd, *_xd; 780 struct jffs2_inode_cache *ic; 781 struct jffs2_raw_node_ref *raw; 782 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 783 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 784 785 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 786 787 /* Phase.1 : Merge same xref */ 788 for (i=0; i < XREF_TMPHASH_SIZE; i++) 789 xref_tmphash[i] = NULL; 790 for (ref=c->xref_temp; ref; ref=_ref) { 791 struct jffs2_xattr_ref *tmp; 792 793 _ref = ref->next; 794 if (ref_flags(ref->node) != REF_PRISTINE) { 795 if (verify_xattr_ref(c, ref)) { 796 BUG_ON(ref->node->next_in_ino != (void *)ref); 797 ref->node->next_in_ino = NULL; 798 jffs2_mark_node_obsolete(c, ref->node); 799 jffs2_free_xattr_ref(ref); 800 continue; 801 } 802 } 803 804 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 805 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 806 if (tmp->ino == ref->ino && tmp->xid == ref->xid) 807 break; 808 } 809 if (tmp) { 810 raw = ref->node; 811 if (ref->xseqno > tmp->xseqno) { 812 tmp->xseqno = ref->xseqno; 813 raw->next_in_ino = tmp->node; 814 tmp->node = raw; 815 } else { 816 raw->next_in_ino = tmp->node->next_in_ino; 817 tmp->node->next_in_ino = raw; 818 } 819 jffs2_free_xattr_ref(ref); 820 continue; 821 } else { 822 ref->next = xref_tmphash[i]; 823 xref_tmphash[i] = ref; 824 } 825 } 826 c->xref_temp = NULL; 827 828 /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 829 for (i=0; i < XREF_TMPHASH_SIZE; i++) { 830 for (ref=xref_tmphash[i]; ref; ref=_ref) { 831 xref_count++; 832 _ref = ref->next; 833 if (is_xattr_ref_dead(ref)) { 834 ref->next = c->xref_dead_list; 835 c->xref_dead_list = ref; 836 xref_dead_count++; 837 continue; 838 } 839 /* At this point, ref->xid and ref->ino contain XID and inode number. 840 ref->xd and ref->ic are not valid yet. */ 841 xd = jffs2_find_xattr_datum(c, ref->xid); 842 ic = jffs2_get_ino_cache(c, ref->ino); 843 if (!xd || !ic || !ic->pino_nlink) { 844 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 845 ref->ino, ref->xid, ref->xseqno); 846 ref->xseqno |= XREF_DELETE_MARKER; 847 ref->next = c->xref_dead_list; 848 c->xref_dead_list = ref; 849 xref_orphan_count++; 850 continue; 851 } 852 ref->xd = xd; 853 ref->ic = ic; 854 atomic_inc(&xd->refcnt); 855 ref->next = ic->xref; 856 ic->xref = ref; 857 } 858 } 859 860 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 861 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 862 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 863 xdatum_count++; 864 list_del_init(&xd->xindex); 865 if (!atomic_read(&xd->refcnt)) { 866 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 867 xd->xid, xd->version); 868 xd->flags |= JFFS2_XFLAGS_DEAD; 869 list_add(&xd->xindex, &c->xattr_unchecked); 870 xdatum_orphan_count++; 871 continue; 872 } 873 if (is_xattr_datum_unchecked(c, xd)) { 874 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 875 xd->xid, xd->version); 876 list_add(&xd->xindex, &c->xattr_unchecked); 877 xdatum_unchecked_count++; 878 } 879 } 880 } 881 /* build complete */ 882 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 883 " (%u unchecked, %u orphan) and " 884 "%u of xref (%u dead, %u orphan) found.\n", 885 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 886 xref_count, xref_dead_count, xref_orphan_count); 887} 888 889struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 890 uint32_t xid, uint32_t version) 891{ 892 struct jffs2_xattr_datum *xd; 893 894 xd = jffs2_find_xattr_datum(c, xid); 895 if (!xd) { 896 xd = jffs2_alloc_xattr_datum(); 897 if (!xd) 898 return ERR_PTR(-ENOMEM); 899 xd->xid = xid; 900 xd->version = version; 901 if (xd->xid > c->highest_xid) 902 c->highest_xid = xd->xid; 903 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 904 } 905 return xd; 906} 907 908/* -------- xattr subsystem functions --------------- 909 * xprefix_to_handler(xprefix) 910 * is used to translate xprefix into xattr_handler. 911 * jffs2_listxattr(dentry, buffer, size) 912 * is an implementation of listxattr handler on jffs2. 913 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 914 * is an implementation of getxattr handler on jffs2. 915 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 916 * is an implementation of setxattr handler on jffs2. 917 * -------------------------------------------------- */ 918const struct xattr_handler *jffs2_xattr_handlers[] = { 919 &jffs2_user_xattr_handler, 920#ifdef CONFIG_JFFS2_FS_SECURITY 921 &jffs2_security_xattr_handler, 922#endif 923#ifdef CONFIG_JFFS2_FS_POSIX_ACL 924 &posix_acl_access_xattr_handler, 925 &posix_acl_default_xattr_handler, 926#endif 927 &jffs2_trusted_xattr_handler, 928 NULL 929}; 930 931static const struct xattr_handler *xprefix_to_handler(int xprefix) { 932 const struct xattr_handler *ret; 933 934 switch (xprefix) { 935 case JFFS2_XPREFIX_USER: 936 ret = &jffs2_user_xattr_handler; 937 break; 938#ifdef CONFIG_JFFS2_FS_SECURITY 939 case JFFS2_XPREFIX_SECURITY: 940 ret = &jffs2_security_xattr_handler; 941 break; 942#endif 943#ifdef CONFIG_JFFS2_FS_POSIX_ACL 944 case JFFS2_XPREFIX_ACL_ACCESS: 945 ret = &posix_acl_access_xattr_handler; 946 break; 947 case JFFS2_XPREFIX_ACL_DEFAULT: 948 ret = &posix_acl_default_xattr_handler; 949 break; 950#endif 951 case JFFS2_XPREFIX_TRUSTED: 952 ret = &jffs2_trusted_xattr_handler; 953 break; 954 default: 955 ret = NULL; 956 break; 957 } 958 return ret; 959} 960 961ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 962{ 963 struct inode *inode = d_inode(dentry); 964 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 965 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 966 struct jffs2_inode_cache *ic = f->inocache; 967 struct jffs2_xattr_ref *ref, **pref; 968 struct jffs2_xattr_datum *xd; 969 const struct xattr_handler *xhandle; 970 ssize_t len, rc; 971 int retry = 0; 972 973 rc = check_xattr_ref_inode(c, ic); 974 if (unlikely(rc)) 975 return rc; 976 977 down_read(&c->xattr_sem); 978 retry: 979 len = 0; 980 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 981 BUG_ON(ref->ic != ic); 982 xd = ref->xd; 983 if (!xd->xname) { 984 /* xdatum is unchached */ 985 if (!retry) { 986 retry = 1; 987 up_read(&c->xattr_sem); 988 down_write(&c->xattr_sem); 989 goto retry; 990 } else { 991 rc = load_xattr_datum(c, xd); 992 if (unlikely(rc > 0)) { 993 *pref = ref->next; 994 delete_xattr_ref(c, ref); 995 goto retry; 996 } else if (unlikely(rc < 0)) 997 goto out; 998 } 999 } 1000 xhandle = xprefix_to_handler(xd->xprefix); 1001 if (!xhandle) 1002 continue; 1003 if (buffer) { 1004 rc = xhandle->list(dentry, buffer+len, size-len, 1005 xd->xname, xd->name_len, xd->flags); 1006 } else { 1007 rc = xhandle->list(dentry, NULL, 0, xd->xname, 1008 xd->name_len, xd->flags); 1009 } 1010 if (rc < 0) 1011 goto out; 1012 len += rc; 1013 } 1014 rc = len; 1015 out: 1016 if (!retry) { 1017 up_read(&c->xattr_sem); 1018 } else { 1019 up_write(&c->xattr_sem); 1020 } 1021 return rc; 1022} 1023 1024int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1025 char *buffer, size_t size) 1026{ 1027 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1028 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1029 struct jffs2_inode_cache *ic = f->inocache; 1030 struct jffs2_xattr_datum *xd; 1031 struct jffs2_xattr_ref *ref, **pref; 1032 int rc, retry = 0; 1033 1034 rc = check_xattr_ref_inode(c, ic); 1035 if (unlikely(rc)) 1036 return rc; 1037 1038 down_read(&c->xattr_sem); 1039 retry: 1040 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1041 BUG_ON(ref->ic!=ic); 1042 1043 xd = ref->xd; 1044 if (xd->xprefix != xprefix) 1045 continue; 1046 if (!xd->xname) { 1047 /* xdatum is unchached */ 1048 if (!retry) { 1049 retry = 1; 1050 up_read(&c->xattr_sem); 1051 down_write(&c->xattr_sem); 1052 goto retry; 1053 } else { 1054 rc = load_xattr_datum(c, xd); 1055 if (unlikely(rc > 0)) { 1056 *pref = ref->next; 1057 delete_xattr_ref(c, ref); 1058 goto retry; 1059 } else if (unlikely(rc < 0)) { 1060 goto out; 1061 } 1062 } 1063 } 1064 if (!strcmp(xname, xd->xname)) { 1065 rc = xd->value_len; 1066 if (buffer) { 1067 if (size < rc) { 1068 rc = -ERANGE; 1069 } else { 1070 memcpy(buffer, xd->xvalue, rc); 1071 } 1072 } 1073 goto out; 1074 } 1075 } 1076 rc = -ENODATA; 1077 out: 1078 if (!retry) { 1079 up_read(&c->xattr_sem); 1080 } else { 1081 up_write(&c->xattr_sem); 1082 } 1083 return rc; 1084} 1085 1086int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1087 const char *buffer, size_t size, int flags) 1088{ 1089 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1090 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1091 struct jffs2_inode_cache *ic = f->inocache; 1092 struct jffs2_xattr_datum *xd; 1093 struct jffs2_xattr_ref *ref, *newref, **pref; 1094 uint32_t length, request; 1095 int rc; 1096 1097 rc = check_xattr_ref_inode(c, ic); 1098 if (unlikely(rc)) 1099 return rc; 1100 1101 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 1102 rc = jffs2_reserve_space(c, request, &length, 1103 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1104 if (rc) { 1105 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1106 return rc; 1107 } 1108 1109 /* Find existing xattr */ 1110 down_write(&c->xattr_sem); 1111 retry: 1112 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1113 xd = ref->xd; 1114 if (xd->xprefix != xprefix) 1115 continue; 1116 if (!xd->xname) { 1117 rc = load_xattr_datum(c, xd); 1118 if (unlikely(rc > 0)) { 1119 *pref = ref->next; 1120 delete_xattr_ref(c, ref); 1121 goto retry; 1122 } else if (unlikely(rc < 0)) 1123 goto out; 1124 } 1125 if (!strcmp(xd->xname, xname)) { 1126 if (flags & XATTR_CREATE) { 1127 rc = -EEXIST; 1128 goto out; 1129 } 1130 if (!buffer) { 1131 ref->ino = ic->ino; 1132 ref->xid = xd->xid; 1133 ref->xseqno |= XREF_DELETE_MARKER; 1134 rc = save_xattr_ref(c, ref); 1135 if (!rc) { 1136 *pref = ref->next; 1137 spin_lock(&c->erase_completion_lock); 1138 ref->next = c->xref_dead_list; 1139 c->xref_dead_list = ref; 1140 spin_unlock(&c->erase_completion_lock); 1141 unrefer_xattr_datum(c, xd); 1142 } else { 1143 ref->ic = ic; 1144 ref->xd = xd; 1145 ref->xseqno &= ~XREF_DELETE_MARKER; 1146 } 1147 goto out; 1148 } 1149 goto found; 1150 } 1151 } 1152 /* not found */ 1153 if (flags & XATTR_REPLACE) { 1154 rc = -ENODATA; 1155 goto out; 1156 } 1157 if (!buffer) { 1158 rc = -ENODATA; 1159 goto out; 1160 } 1161 found: 1162 xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1163 if (IS_ERR(xd)) { 1164 rc = PTR_ERR(xd); 1165 goto out; 1166 } 1167 up_write(&c->xattr_sem); 1168 jffs2_complete_reservation(c); 1169 1170 /* create xattr_ref */ 1171 request = PAD(sizeof(struct jffs2_raw_xref)); 1172 rc = jffs2_reserve_space(c, request, &length, 1173 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1174 down_write(&c->xattr_sem); 1175 if (rc) { 1176 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1177 unrefer_xattr_datum(c, xd); 1178 up_write(&c->xattr_sem); 1179 return rc; 1180 } 1181 if (ref) 1182 *pref = ref->next; 1183 newref = create_xattr_ref(c, ic, xd); 1184 if (IS_ERR(newref)) { 1185 if (ref) { 1186 ref->next = ic->xref; 1187 ic->xref = ref; 1188 } 1189 rc = PTR_ERR(newref); 1190 unrefer_xattr_datum(c, xd); 1191 } else if (ref) { 1192 delete_xattr_ref(c, ref); 1193 } 1194 out: 1195 up_write(&c->xattr_sem); 1196 jffs2_complete_reservation(c); 1197 return rc; 1198} 1199 1200/* -------- garbage collector functions ------------- 1201 * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1202 * is used to move xdatum into new node. 1203 * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1204 * is used to move xref into new node. 1205 * jffs2_verify_xattr(c) 1206 * is used to call do_verify_xattr_datum() before garbage collecting. 1207 * jffs2_release_xattr_datum(c, xd) 1208 * is used to release an in-memory object of xdatum. 1209 * jffs2_release_xattr_ref(c, ref) 1210 * is used to release an in-memory object of xref. 1211 * -------------------------------------------------- */ 1212int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1213 struct jffs2_raw_node_ref *raw) 1214{ 1215 uint32_t totlen, length, old_ofs; 1216 int rc = 0; 1217 1218 down_write(&c->xattr_sem); 1219 if (xd->node != raw) 1220 goto out; 1221 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1222 goto out; 1223 1224 rc = load_xattr_datum(c, xd); 1225 if (unlikely(rc)) { 1226 rc = (rc > 0) ? 0 : rc; 1227 goto out; 1228 } 1229 old_ofs = ref_offset(xd->node); 1230 totlen = PAD(sizeof(struct jffs2_raw_xattr) 1231 + xd->name_len + 1 + xd->value_len); 1232 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1233 if (rc) { 1234 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1235 goto out; 1236 } 1237 rc = save_xattr_datum(c, xd); 1238 if (!rc) 1239 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1240 xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1241 out: 1242 if (!rc) 1243 jffs2_mark_node_obsolete(c, raw); 1244 up_write(&c->xattr_sem); 1245 return rc; 1246} 1247 1248int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1249 struct jffs2_raw_node_ref *raw) 1250{ 1251 uint32_t totlen, length, old_ofs; 1252 int rc = 0; 1253 1254 down_write(&c->xattr_sem); 1255 BUG_ON(!ref->node); 1256 1257 if (ref->node != raw) 1258 goto out; 1259 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1260 goto out; 1261 1262 old_ofs = ref_offset(ref->node); 1263 totlen = ref_totlen(c, c->gcblock, ref->node); 1264 1265 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1266 if (rc) { 1267 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 1268 __func__, rc, totlen); 1269 goto out; 1270 } 1271 rc = save_xattr_ref(c, ref); 1272 if (!rc) 1273 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1274 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1275 out: 1276 if (!rc) 1277 jffs2_mark_node_obsolete(c, raw); 1278 up_write(&c->xattr_sem); 1279 return rc; 1280} 1281 1282int jffs2_verify_xattr(struct jffs2_sb_info *c) 1283{ 1284 struct jffs2_xattr_datum *xd, *_xd; 1285 struct jffs2_eraseblock *jeb; 1286 struct jffs2_raw_node_ref *raw; 1287 uint32_t totlen; 1288 int rc; 1289 1290 down_write(&c->xattr_sem); 1291 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1292 rc = do_verify_xattr_datum(c, xd); 1293 if (rc < 0) 1294 continue; 1295 list_del_init(&xd->xindex); 1296 spin_lock(&c->erase_completion_lock); 1297 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1298 if (ref_flags(raw) != REF_UNCHECKED) 1299 continue; 1300 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1301 totlen = PAD(ref_totlen(c, jeb, raw)); 1302 c->unchecked_size -= totlen; c->used_size += totlen; 1303 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1304 raw->flash_offset = ref_offset(raw) 1305 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1306 } 1307 if (xd->flags & JFFS2_XFLAGS_DEAD) 1308 list_add(&xd->xindex, &c->xattr_dead_list); 1309 spin_unlock(&c->erase_completion_lock); 1310 } 1311 up_write(&c->xattr_sem); 1312 return list_empty(&c->xattr_unchecked) ? 1 : 0; 1313} 1314 1315void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1316{ 1317 /* must be called under spin_lock(&c->erase_completion_lock) */ 1318 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1319 return; 1320 1321 list_del(&xd->xindex); 1322 jffs2_free_xattr_datum(xd); 1323} 1324 1325void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1326{ 1327 /* must be called under spin_lock(&c->erase_completion_lock) */ 1328 struct jffs2_xattr_ref *tmp, **ptmp; 1329 1330 if (ref->node != (void *)ref) 1331 return; 1332 1333 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1334 if (ref == tmp) { 1335 *ptmp = tmp->next; 1336 break; 1337 } 1338 } 1339 jffs2_free_xattr_ref(ref); 1340} 1341