1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4c00c310eSDavid Woodhouse * Copyright © 2006 NEC Corporation 5aa98d7cfSKaiGai Kohei * 6652ecc20SKaiGai Kohei * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7652ecc20SKaiGai Kohei * 8652ecc20SKaiGai Kohei * For licensing information, see the file 'LICENCE' in this directory. 9652ecc20SKaiGai Kohei * 10652ecc20SKaiGai Kohei */ 11c00c310eSDavid Woodhouse 129bbf29e4SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 139bbf29e4SJoe Perches 149824f75dSJean-Christophe DUBOIS #define JFFS2_XATTR_IS_CORRUPTED 1 159824f75dSJean-Christophe DUBOIS 16aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 17aa98d7cfSKaiGai Kohei #include <linux/slab.h> 18aa98d7cfSKaiGai Kohei #include <linux/fs.h> 19aa98d7cfSKaiGai Kohei #include <linux/time.h> 20aa98d7cfSKaiGai Kohei #include <linux/pagemap.h> 21aa98d7cfSKaiGai Kohei #include <linux/highmem.h> 22aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 23aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 24aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 25f2963d45SChristoph Hellwig #include <linux/posix_acl_xattr.h> 26aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 27aa98d7cfSKaiGai Kohei #include "nodelist.h" 28aa98d7cfSKaiGai Kohei /* -------- xdatum related functions ---------------- 29aa98d7cfSKaiGai Kohei * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 30aa98d7cfSKaiGai Kohei * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 31aa98d7cfSKaiGai Kohei * the index of the xattr name/value pair cache (c->xattrindex). 32c9f700f8SKaiGai Kohei * is_xattr_datum_unchecked(c, xd) 33c9f700f8SKaiGai Kohei * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 34c9f700f8SKaiGai Kohei * unchecked, it returns 0. 35aa98d7cfSKaiGai Kohei * unload_xattr_datum(c, xd) 36aa98d7cfSKaiGai Kohei * is used to release xattr name/value pair and detach from c->xattrindex. 37aa98d7cfSKaiGai Kohei * reclaim_xattr_datum(c) 38aa98d7cfSKaiGai Kohei * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 39af901ca1SAndré Goddard Rosa * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold 40aa98d7cfSKaiGai Kohei * is hard coded as 32KiB. 41aa98d7cfSKaiGai Kohei * do_verify_xattr_datum(c, xd) 42aa98d7cfSKaiGai Kohei * is used to load the xdatum informations without name/value pair from the medium. 43aa98d7cfSKaiGai Kohei * It's necessary once, because those informations are not collected during mounting 44aa98d7cfSKaiGai Kohei * process when EBS is enabled. 45aa98d7cfSKaiGai Kohei * 0 will be returned, if success. An negative return value means recoverable error, and 46aa98d7cfSKaiGai Kohei * positive return value means unrecoverable error. Thus, caller must remove this xdatum 47aa98d7cfSKaiGai Kohei * and xref when it returned positive value. 48aa98d7cfSKaiGai Kohei * do_load_xattr_datum(c, xd) 49aa98d7cfSKaiGai Kohei * is used to load name/value pair from the medium. 50aa98d7cfSKaiGai Kohei * The meanings of return value is same as do_verify_xattr_datum(). 51aa98d7cfSKaiGai Kohei * load_xattr_datum(c, xd) 52aa98d7cfSKaiGai Kohei * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 53aa98d7cfSKaiGai Kohei * If xd need to call do_verify_xattr_datum() at first, it's called before calling 54aa98d7cfSKaiGai Kohei * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 559fe4854cSDavid Woodhouse * save_xattr_datum(c, xd) 56aa98d7cfSKaiGai Kohei * is used to write xdatum to medium. xd->version will be incremented. 579fe4854cSDavid Woodhouse * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 58aa98d7cfSKaiGai Kohei * is used to create new xdatum and write to medium. 59c6e8c6ccSKaiGai Kohei * unrefer_xattr_datum(c, xd) 60c6e8c6ccSKaiGai Kohei * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD 61c6e8c6ccSKaiGai Kohei * is set on xd->flags and chained xattr_dead_list or release it immediately. 62c6e8c6ccSKaiGai Kohei * In the first case, the garbage collector release it later. 63aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 64aa98d7cfSKaiGai Kohei static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 65aa98d7cfSKaiGai Kohei { 66aa98d7cfSKaiGai Kohei int name_len = strlen(xname); 67aa98d7cfSKaiGai Kohei 68aa98d7cfSKaiGai Kohei return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 69aa98d7cfSKaiGai Kohei } 70aa98d7cfSKaiGai Kohei 71c9f700f8SKaiGai Kohei static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 72c9f700f8SKaiGai Kohei { 73c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 74c9f700f8SKaiGai Kohei int rc = 0; 75c9f700f8SKaiGai Kohei 76c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 77c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 78c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 79c9f700f8SKaiGai Kohei rc = 1; 80c9f700f8SKaiGai Kohei break; 81c9f700f8SKaiGai Kohei } 82c9f700f8SKaiGai Kohei } 83c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 84c9f700f8SKaiGai Kohei return rc; 85c9f700f8SKaiGai Kohei } 86c9f700f8SKaiGai Kohei 87aa98d7cfSKaiGai Kohei static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 88aa98d7cfSKaiGai Kohei { 89aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 908e24eea7SHarvey Harrison D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); 91aa98d7cfSKaiGai Kohei if (xd->xname) { 92aa98d7cfSKaiGai Kohei c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 93aa98d7cfSKaiGai Kohei kfree(xd->xname); 94aa98d7cfSKaiGai Kohei } 95aa98d7cfSKaiGai Kohei 96aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 97aa98d7cfSKaiGai Kohei xd->hashkey = 0; 98aa98d7cfSKaiGai Kohei xd->xname = NULL; 99aa98d7cfSKaiGai Kohei xd->xvalue = NULL; 100aa98d7cfSKaiGai Kohei } 101aa98d7cfSKaiGai Kohei 102aa98d7cfSKaiGai Kohei static void reclaim_xattr_datum(struct jffs2_sb_info *c) 103aa98d7cfSKaiGai Kohei { 104aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 105aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 106aa98d7cfSKaiGai Kohei uint32_t target, before; 107aa98d7cfSKaiGai Kohei static int index = 0; 108aa98d7cfSKaiGai Kohei int count; 109aa98d7cfSKaiGai Kohei 110aa98d7cfSKaiGai Kohei if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 111aa98d7cfSKaiGai Kohei return; 112aa98d7cfSKaiGai Kohei 113aa98d7cfSKaiGai Kohei before = c->xdatum_mem_usage; 114aa98d7cfSKaiGai Kohei target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 115aa98d7cfSKaiGai Kohei for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 116aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 117aa98d7cfSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_HOT) { 118aa98d7cfSKaiGai Kohei xd->flags &= ~JFFS2_XFLAGS_HOT; 119aa98d7cfSKaiGai Kohei } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 120aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 121aa98d7cfSKaiGai Kohei } 122aa98d7cfSKaiGai Kohei if (c->xdatum_mem_usage <= target) 123aa98d7cfSKaiGai Kohei goto out; 124aa98d7cfSKaiGai Kohei } 125aa98d7cfSKaiGai Kohei index = (index+1) % XATTRINDEX_HASHSIZE; 126aa98d7cfSKaiGai Kohei } 127aa98d7cfSKaiGai Kohei out: 128aa98d7cfSKaiGai Kohei JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 129aa98d7cfSKaiGai Kohei before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 130aa98d7cfSKaiGai Kohei } 131aa98d7cfSKaiGai Kohei 132aa98d7cfSKaiGai Kohei static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 133aa98d7cfSKaiGai Kohei { 134aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 135aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 136c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 137aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr rx; 138aa98d7cfSKaiGai Kohei size_t readlen; 139c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 140aa98d7cfSKaiGai Kohei int rc; 141aa98d7cfSKaiGai Kohei 142c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 143c9f700f8SKaiGai Kohei offset = ref_offset(xd->node); 144c9f700f8SKaiGai Kohei if (ref_flags(xd->node) == REF_PRISTINE) 145c9f700f8SKaiGai Kohei goto complete; 146c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 147aa98d7cfSKaiGai Kohei 148c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 149aa98d7cfSKaiGai Kohei if (rc || readlen != sizeof(rx)) { 15089291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 151c9f700f8SKaiGai Kohei rc, sizeof(rx), readlen, offset); 152aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 153aa98d7cfSKaiGai Kohei } 154aa98d7cfSKaiGai Kohei crc = crc32(0, &rx, sizeof(rx) - 4); 155aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx.node_crc)) { 156aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 157c9f700f8SKaiGai Kohei offset, je32_to_cpu(rx.hdr_crc), crc); 158c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 1599824f75dSJean-Christophe DUBOIS return JFFS2_XATTR_IS_CORRUPTED; 160aa98d7cfSKaiGai Kohei } 1618a13695cSKaiGai Kohei totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 162aa98d7cfSKaiGai Kohei if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 163aa98d7cfSKaiGai Kohei || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 164aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.totlen) != totlen 165aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.xid) != xd->xid 166aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.version) != xd->version) { 167aa98d7cfSKaiGai Kohei JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 168aa98d7cfSKaiGai Kohei "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 169c9f700f8SKaiGai Kohei offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, 170aa98d7cfSKaiGai Kohei je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, 171aa98d7cfSKaiGai Kohei je32_to_cpu(rx.totlen), totlen, 172aa98d7cfSKaiGai Kohei je32_to_cpu(rx.xid), xd->xid, 173aa98d7cfSKaiGai Kohei je32_to_cpu(rx.version), xd->version); 174c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 1759824f75dSJean-Christophe DUBOIS return JFFS2_XATTR_IS_CORRUPTED; 176aa98d7cfSKaiGai Kohei } 177aa98d7cfSKaiGai Kohei xd->xprefix = rx.xprefix; 178aa98d7cfSKaiGai Kohei xd->name_len = rx.name_len; 179aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx.value_len); 180aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx.data_crc); 181aa98d7cfSKaiGai Kohei 182aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 183c9f700f8SKaiGai Kohei complete: 184c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 185c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 186c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 187c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 188aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 189aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 190c9f700f8SKaiGai Kohei } 191c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 192c9f700f8SKaiGai Kohei } 193aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 194aa98d7cfSKaiGai Kohei 195aa98d7cfSKaiGai Kohei /* unchecked xdatum is chained with c->xattr_unchecked */ 196aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 197aa98d7cfSKaiGai Kohei 198f42cf8d6SMasanari Iida dbg_xattr("success on verifying xdatum (xid=%u, version=%u)\n", 199aa98d7cfSKaiGai Kohei xd->xid, xd->version); 200aa98d7cfSKaiGai Kohei 201aa98d7cfSKaiGai Kohei return 0; 202aa98d7cfSKaiGai Kohei } 203aa98d7cfSKaiGai Kohei 204aa98d7cfSKaiGai Kohei static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 205aa98d7cfSKaiGai Kohei { 206aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 207aa98d7cfSKaiGai Kohei char *data; 208aa98d7cfSKaiGai Kohei size_t readlen; 209aa98d7cfSKaiGai Kohei uint32_t crc, length; 210aa98d7cfSKaiGai Kohei int i, ret, retry = 0; 211aa98d7cfSKaiGai Kohei 212aa98d7cfSKaiGai Kohei BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 213aa98d7cfSKaiGai Kohei BUG_ON(!list_empty(&xd->xindex)); 214aa98d7cfSKaiGai Kohei retry: 215aa98d7cfSKaiGai Kohei length = xd->name_len + 1 + xd->value_len; 216aa98d7cfSKaiGai Kohei data = kmalloc(length, GFP_KERNEL); 217aa98d7cfSKaiGai Kohei if (!data) 218aa98d7cfSKaiGai Kohei return -ENOMEM; 219aa98d7cfSKaiGai Kohei 220aa98d7cfSKaiGai Kohei ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 221aa98d7cfSKaiGai Kohei length, &readlen, data); 222aa98d7cfSKaiGai Kohei 223aa98d7cfSKaiGai Kohei if (ret || length!=readlen) { 22489291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 225aa98d7cfSKaiGai Kohei ret, length, readlen, ref_offset(xd->node)); 226aa98d7cfSKaiGai Kohei kfree(data); 227aa98d7cfSKaiGai Kohei return ret ? ret : -EIO; 228aa98d7cfSKaiGai Kohei } 229aa98d7cfSKaiGai Kohei 230aa98d7cfSKaiGai Kohei data[xd->name_len] = '\0'; 231aa98d7cfSKaiGai Kohei crc = crc32(0, data, length); 232aa98d7cfSKaiGai Kohei if (crc != xd->data_crc) { 2339824f75dSJean-Christophe DUBOIS JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XATTR)" 234aa98d7cfSKaiGai Kohei " at %#08x, read: 0x%08x calculated: 0x%08x\n", 235aa98d7cfSKaiGai Kohei ref_offset(xd->node), xd->data_crc, crc); 236aa98d7cfSKaiGai Kohei kfree(data); 237c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 2389824f75dSJean-Christophe DUBOIS return JFFS2_XATTR_IS_CORRUPTED; 239aa98d7cfSKaiGai Kohei } 240aa98d7cfSKaiGai Kohei 241aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 242aa98d7cfSKaiGai Kohei xd->xname = data; 243aa98d7cfSKaiGai Kohei xd->xvalue = data + xd->name_len+1; 244aa98d7cfSKaiGai Kohei 245aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += length; 246aa98d7cfSKaiGai Kohei 247aa98d7cfSKaiGai Kohei xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 248aa98d7cfSKaiGai Kohei i = xd->hashkey % XATTRINDEX_HASHSIZE; 249aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 250aa98d7cfSKaiGai Kohei if (!retry) { 251aa98d7cfSKaiGai Kohei retry = 1; 252aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 253aa98d7cfSKaiGai Kohei if (!xd->xname) 254aa98d7cfSKaiGai Kohei goto retry; 255aa98d7cfSKaiGai Kohei } 256aa98d7cfSKaiGai Kohei 257aa98d7cfSKaiGai Kohei dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 258aa98d7cfSKaiGai Kohei xd->xid, xd->xprefix, xd->xname); 259aa98d7cfSKaiGai Kohei 260aa98d7cfSKaiGai Kohei return 0; 261aa98d7cfSKaiGai Kohei } 262aa98d7cfSKaiGai Kohei 263aa98d7cfSKaiGai Kohei static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 264aa98d7cfSKaiGai Kohei { 265aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem); 266aa98d7cfSKaiGai Kohei * rc < 0 : recoverable error, try again 267aa98d7cfSKaiGai Kohei * rc = 0 : success 268aa98d7cfSKaiGai Kohei * rc > 0 : Unrecoverable error, this node should be deleted. 269aa98d7cfSKaiGai Kohei */ 270aa98d7cfSKaiGai Kohei int rc = 0; 271c9f700f8SKaiGai Kohei 2728a13695cSKaiGai Kohei BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 273c9f700f8SKaiGai Kohei if (xd->xname) 274c9f700f8SKaiGai Kohei return 0; 275c9f700f8SKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_INVALID) 2769824f75dSJean-Christophe DUBOIS return JFFS2_XATTR_IS_CORRUPTED; 277c9f700f8SKaiGai Kohei if (unlikely(is_xattr_datum_unchecked(c, xd))) 278aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 279aa98d7cfSKaiGai Kohei if (!rc) 280aa98d7cfSKaiGai Kohei rc = do_load_xattr_datum(c, xd); 281aa98d7cfSKaiGai Kohei return rc; 282aa98d7cfSKaiGai Kohei } 283aa98d7cfSKaiGai Kohei 2849fe4854cSDavid Woodhouse static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 285aa98d7cfSKaiGai Kohei { 286aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 2872f785402SDavid Woodhouse struct jffs2_raw_xattr rx; 288aa98d7cfSKaiGai Kohei struct kvec vecs[2]; 28989291a9dSDavid Woodhouse size_t length; 2908a13695cSKaiGai Kohei int rc, totlen; 2919fe4854cSDavid Woodhouse uint32_t phys_ofs = write_ofs(c); 292aa98d7cfSKaiGai Kohei 2938a13695cSKaiGai Kohei BUG_ON(!xd->xname); 2948a13695cSKaiGai Kohei BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 295aa98d7cfSKaiGai Kohei 296aa98d7cfSKaiGai Kohei vecs[0].iov_base = ℞ 2978a13695cSKaiGai Kohei vecs[0].iov_len = sizeof(rx); 298aa98d7cfSKaiGai Kohei vecs[1].iov_base = xd->xname; 299aa98d7cfSKaiGai Kohei vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 3008a13695cSKaiGai Kohei totlen = vecs[0].iov_len + vecs[1].iov_len; 3018a13695cSKaiGai Kohei 302aa98d7cfSKaiGai Kohei /* Setup raw-xattr */ 303c9f700f8SKaiGai Kohei memset(&rx, 0, sizeof(rx)); 304aa98d7cfSKaiGai Kohei rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 305aa98d7cfSKaiGai Kohei rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 306aa98d7cfSKaiGai Kohei rx.totlen = cpu_to_je32(PAD(totlen)); 307aa98d7cfSKaiGai Kohei rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 308aa98d7cfSKaiGai Kohei 309aa98d7cfSKaiGai Kohei rx.xid = cpu_to_je32(xd->xid); 310aa98d7cfSKaiGai Kohei rx.version = cpu_to_je32(++xd->version); 311aa98d7cfSKaiGai Kohei rx.xprefix = xd->xprefix; 312aa98d7cfSKaiGai Kohei rx.name_len = xd->name_len; 313aa98d7cfSKaiGai Kohei rx.value_len = cpu_to_je16(xd->value_len); 314aa98d7cfSKaiGai Kohei rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 315aa98d7cfSKaiGai Kohei rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 316aa98d7cfSKaiGai Kohei 3178a13695cSKaiGai Kohei rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 318aa98d7cfSKaiGai Kohei if (rc || totlen != length) { 31989291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 320aa98d7cfSKaiGai Kohei rc, totlen, length, phys_ofs); 321aa98d7cfSKaiGai Kohei rc = rc ? rc : -EIO; 3222f785402SDavid Woodhouse if (length) 3232f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 3242f785402SDavid Woodhouse 325aa98d7cfSKaiGai Kohei return rc; 326aa98d7cfSKaiGai Kohei } 327aa98d7cfSKaiGai Kohei /* success */ 328c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 329aa98d7cfSKaiGai Kohei 330aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 331aa98d7cfSKaiGai Kohei xd->xid, xd->version, xd->xprefix, xd->xname); 332aa98d7cfSKaiGai Kohei 333aa98d7cfSKaiGai Kohei return 0; 334aa98d7cfSKaiGai Kohei } 335aa98d7cfSKaiGai Kohei 336aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 337aa98d7cfSKaiGai Kohei int xprefix, const char *xname, 3389fe4854cSDavid Woodhouse const char *xvalue, int xsize) 339aa98d7cfSKaiGai Kohei { 340aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 341aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 342aa98d7cfSKaiGai Kohei uint32_t hashkey, name_len; 343aa98d7cfSKaiGai Kohei char *data; 344aa98d7cfSKaiGai Kohei int i, rc; 345aa98d7cfSKaiGai Kohei 346aa98d7cfSKaiGai Kohei /* Search xattr_datum has same xname/xvalue by index */ 347aa98d7cfSKaiGai Kohei hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 348aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 349aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 350aa98d7cfSKaiGai Kohei if (xd->hashkey==hashkey 351aa98d7cfSKaiGai Kohei && xd->xprefix==xprefix 352aa98d7cfSKaiGai Kohei && xd->value_len==xsize 353aa98d7cfSKaiGai Kohei && !strcmp(xd->xname, xname) 354aa98d7cfSKaiGai Kohei && !memcmp(xd->xvalue, xvalue, xsize)) { 3552c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 356aa98d7cfSKaiGai Kohei return xd; 357aa98d7cfSKaiGai Kohei } 358aa98d7cfSKaiGai Kohei } 359aa98d7cfSKaiGai Kohei 360aa98d7cfSKaiGai Kohei /* Not found, Create NEW XATTR-Cache */ 361aa98d7cfSKaiGai Kohei name_len = strlen(xname); 362aa98d7cfSKaiGai Kohei 363aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 364aa98d7cfSKaiGai Kohei if (!xd) 365aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 366aa98d7cfSKaiGai Kohei 367aa98d7cfSKaiGai Kohei data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 368aa98d7cfSKaiGai Kohei if (!data) { 369aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 370aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 371aa98d7cfSKaiGai Kohei } 372aa98d7cfSKaiGai Kohei strcpy(data, xname); 373aa98d7cfSKaiGai Kohei memcpy(data + name_len + 1, xvalue, xsize); 374aa98d7cfSKaiGai Kohei 3752c887e23SKaiGai Kohei atomic_set(&xd->refcnt, 1); 376aa98d7cfSKaiGai Kohei xd->xid = ++c->highest_xid; 377aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 378aa98d7cfSKaiGai Kohei xd->xprefix = xprefix; 379aa98d7cfSKaiGai Kohei 380aa98d7cfSKaiGai Kohei xd->hashkey = hashkey; 381aa98d7cfSKaiGai Kohei xd->xname = data; 382aa98d7cfSKaiGai Kohei xd->xvalue = data + name_len + 1; 383aa98d7cfSKaiGai Kohei xd->name_len = name_len; 384aa98d7cfSKaiGai Kohei xd->value_len = xsize; 385aa98d7cfSKaiGai Kohei xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 386aa98d7cfSKaiGai Kohei 3879fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 388aa98d7cfSKaiGai Kohei if (rc) { 389aa98d7cfSKaiGai Kohei kfree(xd->xname); 390aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 391aa98d7cfSKaiGai Kohei return ERR_PTR(rc); 392aa98d7cfSKaiGai Kohei } 393aa98d7cfSKaiGai Kohei 394aa98d7cfSKaiGai Kohei /* Insert Hash Index */ 395aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 396aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 397aa98d7cfSKaiGai Kohei 398aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 399aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 400aa98d7cfSKaiGai Kohei 401aa98d7cfSKaiGai Kohei return xd; 402aa98d7cfSKaiGai Kohei } 403aa98d7cfSKaiGai Kohei 404c6e8c6ccSKaiGai Kohei static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 405c9f700f8SKaiGai Kohei { 406c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 407c6e8c6ccSKaiGai Kohei if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { 408c9f700f8SKaiGai Kohei unload_xattr_datum(c, xd); 4098a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 4108a13695cSKaiGai Kohei if (xd->node == (void *)xd) { 4118a13695cSKaiGai Kohei BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); 4128a13695cSKaiGai Kohei jffs2_free_xattr_datum(xd); 4138a13695cSKaiGai Kohei } else { 414c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_dead_list); 415c9f700f8SKaiGai Kohei } 416c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 417c6e8c6ccSKaiGai Kohei 418a6b1d82dSJeff Garzik dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", 419a6b1d82dSJeff Garzik xd->xid, xd->version); 420c6e8c6ccSKaiGai Kohei } 421c9f700f8SKaiGai Kohei } 422c9f700f8SKaiGai Kohei 42321b9879bSKaiGai Kohei /* -------- xref related functions ------------------ 424aa98d7cfSKaiGai Kohei * verify_xattr_ref(c, ref) 425aa98d7cfSKaiGai Kohei * is used to load xref information from medium. Because summary data does not 426aa98d7cfSKaiGai Kohei * contain xid/ino, it's necessary to verify once while mounting process. 4279fe4854cSDavid Woodhouse * save_xattr_ref(c, ref) 4288a13695cSKaiGai Kohei * is used to write xref to medium. If delete marker is marked, it write 4298a13695cSKaiGai Kohei * a delete marker of xref into medium. 4309fe4854cSDavid Woodhouse * create_xattr_ref(c, ic, xd) 431aa98d7cfSKaiGai Kohei * is used to create a new xref and write to medium. 4328a13695cSKaiGai Kohei * delete_xattr_ref(c, ref) 4338a13695cSKaiGai Kohei * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 4348a13695cSKaiGai Kohei * and allows GC to reclaim those physical nodes. 435aa98d7cfSKaiGai Kohei * jffs2_xattr_delete_inode(c, ic) 436aa98d7cfSKaiGai Kohei * is called to remove xrefs related to obsolete inode when inode is unlinked. 437aa98d7cfSKaiGai Kohei * jffs2_xattr_free_inode(c, ic) 438aa98d7cfSKaiGai Kohei * is called to release xattr related objects when unmounting. 4398f2b6f49SKaiGai Kohei * check_xattr_ref_inode(c, ic) 440aa98d7cfSKaiGai Kohei * is used to confirm inode does not have duplicate xattr name/value pair. 4418c5a0366SJean-Christophe DUBOIS * jffs2_xattr_do_crccheck_inode(c, ic) 4428c5a0366SJean-Christophe DUBOIS * is used to force xattr data integrity check during the initial gc scan. 443aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 444aa98d7cfSKaiGai Kohei static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 445aa98d7cfSKaiGai Kohei { 446aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 447c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 448aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 449aa98d7cfSKaiGai Kohei size_t readlen; 450c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 451aa98d7cfSKaiGai Kohei int rc; 452aa98d7cfSKaiGai Kohei 453c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 454c9f700f8SKaiGai Kohei if (ref_flags(ref->node) != REF_UNCHECKED) 455c9f700f8SKaiGai Kohei goto complete; 456c9f700f8SKaiGai Kohei offset = ref_offset(ref->node); 457c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 458aa98d7cfSKaiGai Kohei 459c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 460aa98d7cfSKaiGai Kohei if (rc || sizeof(rr) != readlen) { 46189291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 462c9f700f8SKaiGai Kohei rc, sizeof(rr), readlen, offset); 463aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 464aa98d7cfSKaiGai Kohei } 465aa98d7cfSKaiGai Kohei /* obsolete node */ 466aa98d7cfSKaiGai Kohei crc = crc32(0, &rr, sizeof(rr) - 4); 467aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr.node_crc)) { 468aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 469c9f700f8SKaiGai Kohei offset, je32_to_cpu(rr.node_crc), crc); 4709824f75dSJean-Christophe DUBOIS return JFFS2_XATTR_IS_CORRUPTED; 471aa98d7cfSKaiGai Kohei } 472aa98d7cfSKaiGai Kohei if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK 473aa98d7cfSKaiGai Kohei || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF 474aa98d7cfSKaiGai Kohei || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { 475aa98d7cfSKaiGai Kohei JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 47689291a9dSDavid Woodhouse "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 477c9f700f8SKaiGai Kohei offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 478aa98d7cfSKaiGai Kohei je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 479aa98d7cfSKaiGai Kohei je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 4809824f75dSJean-Christophe DUBOIS return JFFS2_XATTR_IS_CORRUPTED; 481aa98d7cfSKaiGai Kohei } 482aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr.ino); 483aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr.xid); 484c9f700f8SKaiGai Kohei ref->xseqno = je32_to_cpu(rr.xseqno); 485c9f700f8SKaiGai Kohei if (ref->xseqno > c->highest_xseqno) 486c9f700f8SKaiGai Kohei c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 487aa98d7cfSKaiGai Kohei 488aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 489c9f700f8SKaiGai Kohei complete: 490c9f700f8SKaiGai Kohei for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 491c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 492c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 493c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 494aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 495aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 496c9f700f8SKaiGai Kohei } 497c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 498c9f700f8SKaiGai Kohei } 499aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 500aa98d7cfSKaiGai Kohei 501aa98d7cfSKaiGai Kohei dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 502aa98d7cfSKaiGai Kohei ref->ino, ref->xid, ref_offset(ref->node)); 503aa98d7cfSKaiGai Kohei return 0; 504aa98d7cfSKaiGai Kohei } 505aa98d7cfSKaiGai Kohei 5069fe4854cSDavid Woodhouse static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 507aa98d7cfSKaiGai Kohei { 508aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 509aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 51089291a9dSDavid Woodhouse size_t length; 511c9f700f8SKaiGai Kohei uint32_t xseqno, phys_ofs = write_ofs(c); 512aa98d7cfSKaiGai Kohei int ret; 513aa98d7cfSKaiGai Kohei 514aa98d7cfSKaiGai Kohei rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 515aa98d7cfSKaiGai Kohei rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 516aa98d7cfSKaiGai Kohei rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 517aa98d7cfSKaiGai Kohei rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 518aa98d7cfSKaiGai Kohei 519c9f700f8SKaiGai Kohei xseqno = (c->highest_xseqno += 2); 520c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 521c9f700f8SKaiGai Kohei xseqno |= XREF_DELETE_MARKER; 522c9f700f8SKaiGai Kohei rr.ino = cpu_to_je32(ref->ino); 523c9f700f8SKaiGai Kohei rr.xid = cpu_to_je32(ref->xid); 524c9f700f8SKaiGai Kohei } else { 525aa98d7cfSKaiGai Kohei rr.ino = cpu_to_je32(ref->ic->ino); 526aa98d7cfSKaiGai Kohei rr.xid = cpu_to_je32(ref->xd->xid); 527c9f700f8SKaiGai Kohei } 528c9f700f8SKaiGai Kohei rr.xseqno = cpu_to_je32(xseqno); 529aa98d7cfSKaiGai Kohei rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 530aa98d7cfSKaiGai Kohei 531aa98d7cfSKaiGai Kohei ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 532aa98d7cfSKaiGai Kohei if (ret || sizeof(rr) != length) { 53389291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 534aa98d7cfSKaiGai Kohei ret, sizeof(rr), length, phys_ofs); 535aa98d7cfSKaiGai Kohei ret = ret ? ret : -EIO; 5362f785402SDavid Woodhouse if (length) 5372f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 5382f785402SDavid Woodhouse 539aa98d7cfSKaiGai Kohei return ret; 540aa98d7cfSKaiGai Kohei } 541c9f700f8SKaiGai Kohei /* success */ 542c9f700f8SKaiGai Kohei ref->xseqno = xseqno; 543c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 544aa98d7cfSKaiGai Kohei 545aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 546aa98d7cfSKaiGai Kohei 547aa98d7cfSKaiGai Kohei return 0; 548aa98d7cfSKaiGai Kohei } 549aa98d7cfSKaiGai Kohei 550aa98d7cfSKaiGai Kohei static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 5519fe4854cSDavid Woodhouse struct jffs2_xattr_datum *xd) 552aa98d7cfSKaiGai Kohei { 553aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 554aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 555aa98d7cfSKaiGai Kohei int ret; 556aa98d7cfSKaiGai Kohei 557aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 558aa98d7cfSKaiGai Kohei if (!ref) 559aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 560aa98d7cfSKaiGai Kohei ref->ic = ic; 561aa98d7cfSKaiGai Kohei ref->xd = xd; 562aa98d7cfSKaiGai Kohei 5639fe4854cSDavid Woodhouse ret = save_xattr_ref(c, ref); 564aa98d7cfSKaiGai Kohei if (ret) { 565aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 566aa98d7cfSKaiGai Kohei return ERR_PTR(ret); 567aa98d7cfSKaiGai Kohei } 568aa98d7cfSKaiGai Kohei 569aa98d7cfSKaiGai Kohei /* Chain to inode */ 5708f2b6f49SKaiGai Kohei ref->next = ic->xref; 5718f2b6f49SKaiGai Kohei ic->xref = ref; 572aa98d7cfSKaiGai Kohei 573aa98d7cfSKaiGai Kohei return ref; /* success */ 574aa98d7cfSKaiGai Kohei } 575aa98d7cfSKaiGai Kohei 5768a13695cSKaiGai Kohei static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 577c9f700f8SKaiGai Kohei { 578c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 579c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 580c9f700f8SKaiGai Kohei 581c9f700f8SKaiGai Kohei xd = ref->xd; 5828a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 583c9f700f8SKaiGai Kohei ref->ino = ref->ic->ino; 584c9f700f8SKaiGai Kohei ref->xid = ref->xd->xid; 585c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 586c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 587c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 588c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 589c9f700f8SKaiGai Kohei 5908a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 5918a13695cSKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 592c9f700f8SKaiGai Kohei 593c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 594c9f700f8SKaiGai Kohei } 595c9f700f8SKaiGai Kohei 596aa98d7cfSKaiGai Kohei void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 597aa98d7cfSKaiGai Kohei { 598b57922d9SAl Viro /* It's called from jffs2_evict_inode() on inode removing. 599aa98d7cfSKaiGai Kohei When an inode with XATTR is removed, those XATTRs must be removed. */ 6008a13695cSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 601aa98d7cfSKaiGai Kohei 60227c72b04SDavid Woodhouse if (!ic || ic->pino_nlink > 0) 603aa98d7cfSKaiGai Kohei return; 604aa98d7cfSKaiGai Kohei 605c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 6068a13695cSKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 6078a13695cSKaiGai Kohei _ref = ref->next; 6088a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 609c9f700f8SKaiGai Kohei } 6108a13695cSKaiGai Kohei ic->xref = NULL; 611aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 612aa98d7cfSKaiGai Kohei } 613aa98d7cfSKaiGai Kohei 614aa98d7cfSKaiGai Kohei void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 615aa98d7cfSKaiGai Kohei { 616aa98d7cfSKaiGai Kohei /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 617aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 618aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 619aa98d7cfSKaiGai Kohei 620aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 6218f2b6f49SKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 6228f2b6f49SKaiGai Kohei _ref = ref->next; 623aa98d7cfSKaiGai Kohei xd = ref->xd; 6242c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) { 625aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 626aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 627aa98d7cfSKaiGai Kohei } 628aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 629aa98d7cfSKaiGai Kohei } 6308f2b6f49SKaiGai Kohei ic->xref = NULL; 631aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 632aa98d7cfSKaiGai Kohei } 633aa98d7cfSKaiGai Kohei 6348f2b6f49SKaiGai Kohei static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 635aa98d7cfSKaiGai Kohei { 636a4ce96acSLinus Torvalds /* success of check_xattr_ref_inode() means that inode (ic) dose not have 637aa98d7cfSKaiGai Kohei * duplicate name/value pairs. If duplicate name/value pair would be found, 638aa98d7cfSKaiGai Kohei * one will be removed. 639aa98d7cfSKaiGai Kohei */ 640c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 641aa98d7cfSKaiGai Kohei int rc = 0; 642aa98d7cfSKaiGai Kohei 643aa98d7cfSKaiGai Kohei if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 644aa98d7cfSKaiGai Kohei return 0; 645aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 646aa98d7cfSKaiGai Kohei retry: 647aa98d7cfSKaiGai Kohei rc = 0; 6488f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 649aa98d7cfSKaiGai Kohei if (!ref->xd->xname) { 650aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, ref->xd); 651aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 6528f2b6f49SKaiGai Kohei *pref = ref->next; 6538a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 654aa98d7cfSKaiGai Kohei goto retry; 655aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 656aa98d7cfSKaiGai Kohei goto out; 657aa98d7cfSKaiGai Kohei } 658c9f700f8SKaiGai Kohei for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 659aa98d7cfSKaiGai Kohei if (!cmp->xd->xname) { 660aa98d7cfSKaiGai Kohei ref->xd->flags |= JFFS2_XFLAGS_BIND; 661aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, cmp->xd); 662aa98d7cfSKaiGai Kohei ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 663aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 664c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6658a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 666aa98d7cfSKaiGai Kohei goto retry; 667aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 668aa98d7cfSKaiGai Kohei goto out; 669aa98d7cfSKaiGai Kohei } 670aa98d7cfSKaiGai Kohei if (ref->xd->xprefix == cmp->xd->xprefix 671aa98d7cfSKaiGai Kohei && !strcmp(ref->xd->xname, cmp->xd->xname)) { 672c9f700f8SKaiGai Kohei if (ref->xseqno > cmp->xseqno) { 673c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6748a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 675c9f700f8SKaiGai Kohei } else { 676c9f700f8SKaiGai Kohei *pref = ref->next; 6778a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 678c9f700f8SKaiGai Kohei } 679aa98d7cfSKaiGai Kohei goto retry; 680aa98d7cfSKaiGai Kohei } 681aa98d7cfSKaiGai Kohei } 682aa98d7cfSKaiGai Kohei } 683aa98d7cfSKaiGai Kohei ic->flags |= INO_FLAGS_XATTR_CHECKED; 684aa98d7cfSKaiGai Kohei out: 685aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 686aa98d7cfSKaiGai Kohei 687aa98d7cfSKaiGai Kohei return rc; 688aa98d7cfSKaiGai Kohei } 689aa98d7cfSKaiGai Kohei 6908c5a0366SJean-Christophe DUBOIS void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 6918c5a0366SJean-Christophe DUBOIS { 6928c5a0366SJean-Christophe DUBOIS check_xattr_ref_inode(c, ic); 6938c5a0366SJean-Christophe DUBOIS } 6948c5a0366SJean-Christophe DUBOIS 695aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 696aa98d7cfSKaiGai Kohei * jffs2_init_xattr_subsystem(c) 697aa98d7cfSKaiGai Kohei * is used to initialize semaphore and list_head, and some variables. 698aa98d7cfSKaiGai Kohei * jffs2_find_xattr_datum(c, xid) 699aa98d7cfSKaiGai Kohei * is used to lookup xdatum while scanning process. 700aa98d7cfSKaiGai Kohei * jffs2_clear_xattr_subsystem(c) 701aa98d7cfSKaiGai Kohei * is used to release any xattr related objects. 702aa98d7cfSKaiGai Kohei * jffs2_build_xattr_subsystem(c) 703aa98d7cfSKaiGai Kohei * is used to associate xdatum and xref while super block building process. 704aa98d7cfSKaiGai Kohei * jffs2_setup_xattr_datum(c, xid, version) 705aa98d7cfSKaiGai Kohei * is used to insert xdatum while scanning process. 706aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 707aa98d7cfSKaiGai Kohei void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 708aa98d7cfSKaiGai Kohei { 709aa98d7cfSKaiGai Kohei int i; 710aa98d7cfSKaiGai Kohei 711aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) 712aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattrindex[i]); 713aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattr_unchecked); 714c9f700f8SKaiGai Kohei INIT_LIST_HEAD(&c->xattr_dead_list); 715c9f700f8SKaiGai Kohei c->xref_dead_list = NULL; 7168f2b6f49SKaiGai Kohei c->xref_temp = NULL; 717aa98d7cfSKaiGai Kohei 718aa98d7cfSKaiGai Kohei init_rwsem(&c->xattr_sem); 719c9f700f8SKaiGai Kohei c->highest_xid = 0; 720c9f700f8SKaiGai Kohei c->highest_xseqno = 0; 721aa98d7cfSKaiGai Kohei c->xdatum_mem_usage = 0; 722aa98d7cfSKaiGai Kohei c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 723aa98d7cfSKaiGai Kohei } 724aa98d7cfSKaiGai Kohei 725aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 726aa98d7cfSKaiGai Kohei { 727aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 728aa98d7cfSKaiGai Kohei int i = xid % XATTRINDEX_HASHSIZE; 729aa98d7cfSKaiGai Kohei 730aa98d7cfSKaiGai Kohei /* It's only used in scanning/building process. */ 731aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 732aa98d7cfSKaiGai Kohei 733aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 734aa98d7cfSKaiGai Kohei if (xd->xid==xid) 735aa98d7cfSKaiGai Kohei return xd; 736aa98d7cfSKaiGai Kohei } 737aa98d7cfSKaiGai Kohei return NULL; 738aa98d7cfSKaiGai Kohei } 739aa98d7cfSKaiGai Kohei 740aa98d7cfSKaiGai Kohei void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 741aa98d7cfSKaiGai Kohei { 742aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 743aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 744aa98d7cfSKaiGai Kohei int i; 745aa98d7cfSKaiGai Kohei 7468f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref = _ref) { 7478f2b6f49SKaiGai Kohei _ref = ref->next; 748aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 7498f2b6f49SKaiGai Kohei } 750c9f700f8SKaiGai Kohei 751c9f700f8SKaiGai Kohei for (ref=c->xref_dead_list; ref; ref = _ref) { 752c9f700f8SKaiGai Kohei _ref = ref->next; 753c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 754c9f700f8SKaiGai Kohei } 755aa98d7cfSKaiGai Kohei 756aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 757aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 758aa98d7cfSKaiGai Kohei list_del(&xd->xindex); 759aa98d7cfSKaiGai Kohei kfree(xd->xname); 760aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 761aa98d7cfSKaiGai Kohei } 762aa98d7cfSKaiGai Kohei } 763c9f700f8SKaiGai Kohei 764c9f700f8SKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 765c9f700f8SKaiGai Kohei list_del(&xd->xindex); 766c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 767c9f700f8SKaiGai Kohei } 7682ad8ee71SDavid Woodhouse list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 7692ad8ee71SDavid Woodhouse list_del(&xd->xindex); 7702ad8ee71SDavid Woodhouse jffs2_free_xattr_datum(xd); 7712ad8ee71SDavid Woodhouse } 772aa98d7cfSKaiGai Kohei } 773aa98d7cfSKaiGai Kohei 774c9f700f8SKaiGai Kohei #define XREF_TMPHASH_SIZE (128) 7751168f095SFabian Frederick int jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 776aa98d7cfSKaiGai Kohei { 777aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 7781168f095SFabian Frederick struct jffs2_xattr_ref **xref_tmphash; 779aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 780aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic; 781c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 782aa98d7cfSKaiGai Kohei int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 7838a13695cSKaiGai Kohei int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 784aa98d7cfSKaiGai Kohei 785aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 786aa98d7cfSKaiGai Kohei 7871168f095SFabian Frederick xref_tmphash = kcalloc(XREF_TMPHASH_SIZE, 7881168f095SFabian Frederick sizeof(struct jffs2_xattr_ref *), GFP_KERNEL); 7891168f095SFabian Frederick if (!xref_tmphash) 7901168f095SFabian Frederick return -ENOMEM; 7911168f095SFabian Frederick 7928a13695cSKaiGai Kohei /* Phase.1 : Merge same xref */ 7938f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref=_ref) { 794c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp; 795c9f700f8SKaiGai Kohei 7968f2b6f49SKaiGai Kohei _ref = ref->next; 797aa98d7cfSKaiGai Kohei if (ref_flags(ref->node) != REF_PRISTINE) { 798aa98d7cfSKaiGai Kohei if (verify_xattr_ref(c, ref)) { 799c9f700f8SKaiGai Kohei BUG_ON(ref->node->next_in_ino != (void *)ref); 800c9f700f8SKaiGai Kohei ref->node->next_in_ino = NULL; 801c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, ref->node); 802aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 803aa98d7cfSKaiGai Kohei continue; 804aa98d7cfSKaiGai Kohei } 805aa98d7cfSKaiGai Kohei } 806c9f700f8SKaiGai Kohei 807c9f700f8SKaiGai Kohei i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 808c9f700f8SKaiGai Kohei for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 809c9f700f8SKaiGai Kohei if (tmp->ino == ref->ino && tmp->xid == ref->xid) 810c9f700f8SKaiGai Kohei break; 811c9f700f8SKaiGai Kohei } 812c9f700f8SKaiGai Kohei if (tmp) { 813c9f700f8SKaiGai Kohei raw = ref->node; 814c9f700f8SKaiGai Kohei if (ref->xseqno > tmp->xseqno) { 815c9f700f8SKaiGai Kohei tmp->xseqno = ref->xseqno; 816c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node; 817c9f700f8SKaiGai Kohei tmp->node = raw; 818c9f700f8SKaiGai Kohei } else { 819c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node->next_in_ino; 820c9f700f8SKaiGai Kohei tmp->node->next_in_ino = raw; 821c9f700f8SKaiGai Kohei } 822c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 823c9f700f8SKaiGai Kohei continue; 824c9f700f8SKaiGai Kohei } else { 825c9f700f8SKaiGai Kohei ref->next = xref_tmphash[i]; 826c9f700f8SKaiGai Kohei xref_tmphash[i] = ref; 827c9f700f8SKaiGai Kohei } 828c9f700f8SKaiGai Kohei } 829c9f700f8SKaiGai Kohei c->xref_temp = NULL; 830c9f700f8SKaiGai Kohei 8318a13695cSKaiGai Kohei /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 832c9f700f8SKaiGai Kohei for (i=0; i < XREF_TMPHASH_SIZE; i++) { 833c9f700f8SKaiGai Kohei for (ref=xref_tmphash[i]; ref; ref=_ref) { 8348a13695cSKaiGai Kohei xref_count++; 835c9f700f8SKaiGai Kohei _ref = ref->next; 836c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 837c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 838c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8398a13695cSKaiGai Kohei xref_dead_count++; 840c9f700f8SKaiGai Kohei continue; 841c9f700f8SKaiGai Kohei } 842aa98d7cfSKaiGai Kohei /* At this point, ref->xid and ref->ino contain XID and inode number. 843aa98d7cfSKaiGai Kohei ref->xd and ref->ic are not valid yet. */ 844aa98d7cfSKaiGai Kohei xd = jffs2_find_xattr_datum(c, ref->xid); 845aa98d7cfSKaiGai Kohei ic = jffs2_get_ino_cache(c, ref->ino); 84627c72b04SDavid Woodhouse if (!xd || !ic || !ic->pino_nlink) { 8478a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 848c9f700f8SKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 8498a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 850c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 851c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8528a13695cSKaiGai Kohei xref_orphan_count++; 853aa98d7cfSKaiGai Kohei continue; 854aa98d7cfSKaiGai Kohei } 855aa98d7cfSKaiGai Kohei ref->xd = xd; 856aa98d7cfSKaiGai Kohei ref->ic = ic; 8572c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 8588f2b6f49SKaiGai Kohei ref->next = ic->xref; 8598f2b6f49SKaiGai Kohei ic->xref = ref; 860aa98d7cfSKaiGai Kohei } 861c9f700f8SKaiGai Kohei } 862aa98d7cfSKaiGai Kohei 8638a13695cSKaiGai Kohei /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 864aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 865aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 8668a13695cSKaiGai Kohei xdatum_count++; 867aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 8682c887e23SKaiGai Kohei if (!atomic_read(&xd->refcnt)) { 8698a13695cSKaiGai Kohei dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 870c9f700f8SKaiGai Kohei xd->xid, xd->version); 8718a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 872c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 8738a13695cSKaiGai Kohei xdatum_orphan_count++; 874aa98d7cfSKaiGai Kohei continue; 875aa98d7cfSKaiGai Kohei } 876c9f700f8SKaiGai Kohei if (is_xattr_datum_unchecked(c, xd)) { 877c9f700f8SKaiGai Kohei dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 878c9f700f8SKaiGai Kohei xd->xid, xd->version); 879aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 880aa98d7cfSKaiGai Kohei xdatum_unchecked_count++; 881aa98d7cfSKaiGai Kohei } 882aa98d7cfSKaiGai Kohei } 883aa98d7cfSKaiGai Kohei } 884aa98d7cfSKaiGai Kohei /* build complete */ 8858a13695cSKaiGai Kohei JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 8868a13695cSKaiGai Kohei " (%u unchecked, %u orphan) and " 8878a13695cSKaiGai Kohei "%u of xref (%u dead, %u orphan) found.\n", 8888a13695cSKaiGai Kohei xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 8898a13695cSKaiGai Kohei xref_count, xref_dead_count, xref_orphan_count); 8901168f095SFabian Frederick kfree(xref_tmphash); 8911168f095SFabian Frederick return 0; 892aa98d7cfSKaiGai Kohei } 893aa98d7cfSKaiGai Kohei 894aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 895aa98d7cfSKaiGai Kohei uint32_t xid, uint32_t version) 896aa98d7cfSKaiGai Kohei { 897c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 898aa98d7cfSKaiGai Kohei 899c9f700f8SKaiGai Kohei xd = jffs2_find_xattr_datum(c, xid); 900c9f700f8SKaiGai Kohei if (!xd) { 901aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 902aa98d7cfSKaiGai Kohei if (!xd) 903aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 904aa98d7cfSKaiGai Kohei xd->xid = xid; 905aa98d7cfSKaiGai Kohei xd->version = version; 906aa98d7cfSKaiGai Kohei if (xd->xid > c->highest_xid) 907aa98d7cfSKaiGai Kohei c->highest_xid = xd->xid; 908aa98d7cfSKaiGai Kohei list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 909aa98d7cfSKaiGai Kohei } 910aa98d7cfSKaiGai Kohei return xd; 911aa98d7cfSKaiGai Kohei } 912aa98d7cfSKaiGai Kohei 913aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 914aa98d7cfSKaiGai Kohei * xprefix_to_handler(xprefix) 915aa98d7cfSKaiGai Kohei * is used to translate xprefix into xattr_handler. 916aa98d7cfSKaiGai Kohei * jffs2_listxattr(dentry, buffer, size) 917aa98d7cfSKaiGai Kohei * is an implementation of listxattr handler on jffs2. 918aa98d7cfSKaiGai Kohei * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 919aa98d7cfSKaiGai Kohei * is an implementation of getxattr handler on jffs2. 920aa98d7cfSKaiGai Kohei * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 921aa98d7cfSKaiGai Kohei * is an implementation of setxattr handler on jffs2. 922aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 92313a75c3aSWedson Almeida Filho const struct xattr_handler * const jffs2_xattr_handlers[] = { 924aa98d7cfSKaiGai Kohei &jffs2_user_xattr_handler, 925aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 926aa98d7cfSKaiGai Kohei &jffs2_security_xattr_handler, 927aa98d7cfSKaiGai Kohei #endif 928aa98d7cfSKaiGai Kohei &jffs2_trusted_xattr_handler, 929aa98d7cfSKaiGai Kohei NULL 930aa98d7cfSKaiGai Kohei }; 931aa98d7cfSKaiGai Kohei 932a5488f29SChristian Brauner static const char *jffs2_xattr_prefix(int xprefix, struct dentry *dentry) 933a5488f29SChristian Brauner { 934a5488f29SChristian Brauner const struct xattr_handler *ret = NULL; 935aa98d7cfSKaiGai Kohei 936aa98d7cfSKaiGai Kohei switch (xprefix) { 937aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_USER: 938aa98d7cfSKaiGai Kohei ret = &jffs2_user_xattr_handler; 939aa98d7cfSKaiGai Kohei break; 940aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 941aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_SECURITY: 942aa98d7cfSKaiGai Kohei ret = &jffs2_security_xattr_handler; 943aa98d7cfSKaiGai Kohei break; 944aa98d7cfSKaiGai Kohei #endif 945aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 946aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_ACCESS: 947d549b741SChristian Brauner ret = &nop_posix_acl_access; 948aa98d7cfSKaiGai Kohei break; 949aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_DEFAULT: 950d549b741SChristian Brauner ret = &nop_posix_acl_default; 951aa98d7cfSKaiGai Kohei break; 952aa98d7cfSKaiGai Kohei #endif 953aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_TRUSTED: 954aa98d7cfSKaiGai Kohei ret = &jffs2_trusted_xattr_handler; 955aa98d7cfSKaiGai Kohei break; 956aa98d7cfSKaiGai Kohei default: 957a5488f29SChristian Brauner return NULL; 958aa98d7cfSKaiGai Kohei } 959a5488f29SChristian Brauner 960a5488f29SChristian Brauner if (!xattr_handler_can_list(ret, dentry)) 961a5488f29SChristian Brauner return NULL; 962a5488f29SChristian Brauner 963a5488f29SChristian Brauner return xattr_prefix(ret); 964aa98d7cfSKaiGai Kohei } 965aa98d7cfSKaiGai Kohei 966aa98d7cfSKaiGai Kohei ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 967aa98d7cfSKaiGai Kohei { 9682b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 969aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 970aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 971aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 9728f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 973aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 974764a5c6bSAndreas Gruenbacher const char *prefix; 975764a5c6bSAndreas Gruenbacher ssize_t prefix_len, len, rc; 976aa98d7cfSKaiGai Kohei int retry = 0; 977aa98d7cfSKaiGai Kohei 9788f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 979aa98d7cfSKaiGai Kohei if (unlikely(rc)) 980aa98d7cfSKaiGai Kohei return rc; 981aa98d7cfSKaiGai Kohei 982aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 983aa98d7cfSKaiGai Kohei retry: 984aa98d7cfSKaiGai Kohei len = 0; 9858f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 986aa98d7cfSKaiGai Kohei BUG_ON(ref->ic != ic); 987aa98d7cfSKaiGai Kohei xd = ref->xd; 988aa98d7cfSKaiGai Kohei if (!xd->xname) { 989aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 990aa98d7cfSKaiGai Kohei if (!retry) { 991aa98d7cfSKaiGai Kohei retry = 1; 992aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 993aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 994aa98d7cfSKaiGai Kohei goto retry; 995aa98d7cfSKaiGai Kohei } else { 996aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 997aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 9988f2b6f49SKaiGai Kohei *pref = ref->next; 9998a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1000aa98d7cfSKaiGai Kohei goto retry; 1001aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 1002aa98d7cfSKaiGai Kohei goto out; 1003aa98d7cfSKaiGai Kohei } 1004aa98d7cfSKaiGai Kohei } 1005a5488f29SChristian Brauner 1006a5488f29SChristian Brauner prefix = jffs2_xattr_prefix(xd->xprefix, dentry); 1007a5488f29SChristian Brauner if (!prefix) 1008aa98d7cfSKaiGai Kohei continue; 1009764a5c6bSAndreas Gruenbacher prefix_len = strlen(prefix); 1010764a5c6bSAndreas Gruenbacher rc = prefix_len + xd->name_len + 1; 1011764a5c6bSAndreas Gruenbacher 1012aa98d7cfSKaiGai Kohei if (buffer) { 1013764a5c6bSAndreas Gruenbacher if (rc > size - len) { 1014764a5c6bSAndreas Gruenbacher rc = -ERANGE; 1015aa98d7cfSKaiGai Kohei goto out; 1016764a5c6bSAndreas Gruenbacher } 1017764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 1018764a5c6bSAndreas Gruenbacher buffer += prefix_len; 1019764a5c6bSAndreas Gruenbacher memcpy(buffer, xd->xname, xd->name_len); 1020764a5c6bSAndreas Gruenbacher buffer += xd->name_len; 1021764a5c6bSAndreas Gruenbacher *buffer++ = 0; 1022764a5c6bSAndreas Gruenbacher } 1023aa98d7cfSKaiGai Kohei len += rc; 1024aa98d7cfSKaiGai Kohei } 1025aa98d7cfSKaiGai Kohei rc = len; 1026aa98d7cfSKaiGai Kohei out: 1027aa98d7cfSKaiGai Kohei if (!retry) { 1028aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1029aa98d7cfSKaiGai Kohei } else { 1030aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1031aa98d7cfSKaiGai Kohei } 1032aa98d7cfSKaiGai Kohei return rc; 1033aa98d7cfSKaiGai Kohei } 1034aa98d7cfSKaiGai Kohei 1035aa98d7cfSKaiGai Kohei int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1036aa98d7cfSKaiGai Kohei char *buffer, size_t size) 1037aa98d7cfSKaiGai Kohei { 1038aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1039aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1040aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1041aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 10428f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 1043aa98d7cfSKaiGai Kohei int rc, retry = 0; 1044aa98d7cfSKaiGai Kohei 10458f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1046aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1047aa98d7cfSKaiGai Kohei return rc; 1048aa98d7cfSKaiGai Kohei 1049aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 1050aa98d7cfSKaiGai Kohei retry: 10518f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1052aa98d7cfSKaiGai Kohei BUG_ON(ref->ic!=ic); 1053aa98d7cfSKaiGai Kohei 1054aa98d7cfSKaiGai Kohei xd = ref->xd; 1055aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1056aa98d7cfSKaiGai Kohei continue; 1057aa98d7cfSKaiGai Kohei if (!xd->xname) { 1058aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 1059aa98d7cfSKaiGai Kohei if (!retry) { 1060aa98d7cfSKaiGai Kohei retry = 1; 1061aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1062aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1063aa98d7cfSKaiGai Kohei goto retry; 1064aa98d7cfSKaiGai Kohei } else { 1065aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1066aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 10678f2b6f49SKaiGai Kohei *pref = ref->next; 10688a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1069aa98d7cfSKaiGai Kohei goto retry; 1070aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) { 1071aa98d7cfSKaiGai Kohei goto out; 1072aa98d7cfSKaiGai Kohei } 1073aa98d7cfSKaiGai Kohei } 1074aa98d7cfSKaiGai Kohei } 1075aa98d7cfSKaiGai Kohei if (!strcmp(xname, xd->xname)) { 1076aa98d7cfSKaiGai Kohei rc = xd->value_len; 1077aa98d7cfSKaiGai Kohei if (buffer) { 1078aa98d7cfSKaiGai Kohei if (size < rc) { 1079aa98d7cfSKaiGai Kohei rc = -ERANGE; 1080aa98d7cfSKaiGai Kohei } else { 1081aa98d7cfSKaiGai Kohei memcpy(buffer, xd->xvalue, rc); 1082aa98d7cfSKaiGai Kohei } 1083aa98d7cfSKaiGai Kohei } 1084aa98d7cfSKaiGai Kohei goto out; 1085aa98d7cfSKaiGai Kohei } 1086aa98d7cfSKaiGai Kohei } 1087aa98d7cfSKaiGai Kohei rc = -ENODATA; 1088aa98d7cfSKaiGai Kohei out: 1089aa98d7cfSKaiGai Kohei if (!retry) { 1090aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1091aa98d7cfSKaiGai Kohei } else { 1092aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1093aa98d7cfSKaiGai Kohei } 1094aa98d7cfSKaiGai Kohei return rc; 1095aa98d7cfSKaiGai Kohei } 1096aa98d7cfSKaiGai Kohei 1097aa98d7cfSKaiGai Kohei int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1098aa98d7cfSKaiGai Kohei const char *buffer, size_t size, int flags) 1099aa98d7cfSKaiGai Kohei { 1100aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1101aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1102aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1103aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 11048f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, *newref, **pref; 11059fe4854cSDavid Woodhouse uint32_t length, request; 1106aa98d7cfSKaiGai Kohei int rc; 1107aa98d7cfSKaiGai Kohei 11088f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1109aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1110aa98d7cfSKaiGai Kohei return rc; 1111aa98d7cfSKaiGai Kohei 1112aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 1113*c6854e5aSIlya Denisyev if (request > c->sector_size - c->cleanmarker_size) 1114*c6854e5aSIlya Denisyev return -ERANGE; 1115*c6854e5aSIlya Denisyev 11169fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1117aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1118aa98d7cfSKaiGai Kohei if (rc) { 1119aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1120aa98d7cfSKaiGai Kohei return rc; 1121aa98d7cfSKaiGai Kohei } 1122aa98d7cfSKaiGai Kohei 1123aa98d7cfSKaiGai Kohei /* Find existing xattr */ 1124aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1125aa98d7cfSKaiGai Kohei retry: 11268f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1127aa98d7cfSKaiGai Kohei xd = ref->xd; 1128aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1129aa98d7cfSKaiGai Kohei continue; 1130aa98d7cfSKaiGai Kohei if (!xd->xname) { 1131aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1132aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 11338f2b6f49SKaiGai Kohei *pref = ref->next; 11348a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1135aa98d7cfSKaiGai Kohei goto retry; 1136aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 1137aa98d7cfSKaiGai Kohei goto out; 1138aa98d7cfSKaiGai Kohei } 1139aa98d7cfSKaiGai Kohei if (!strcmp(xd->xname, xname)) { 1140aa98d7cfSKaiGai Kohei if (flags & XATTR_CREATE) { 1141aa98d7cfSKaiGai Kohei rc = -EEXIST; 1142aa98d7cfSKaiGai Kohei goto out; 1143aa98d7cfSKaiGai Kohei } 1144aa98d7cfSKaiGai Kohei if (!buffer) { 11458a13695cSKaiGai Kohei ref->ino = ic->ino; 11468a13695cSKaiGai Kohei ref->xid = xd->xid; 11478a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 11488a13695cSKaiGai Kohei rc = save_xattr_ref(c, ref); 11498a13695cSKaiGai Kohei if (!rc) { 11508f2b6f49SKaiGai Kohei *pref = ref->next; 11518a13695cSKaiGai Kohei spin_lock(&c->erase_completion_lock); 11528a13695cSKaiGai Kohei ref->next = c->xref_dead_list; 11538a13695cSKaiGai Kohei c->xref_dead_list = ref; 11548a13695cSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1155c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 11568a13695cSKaiGai Kohei } else { 11578a13695cSKaiGai Kohei ref->ic = ic; 11588a13695cSKaiGai Kohei ref->xd = xd; 11598a13695cSKaiGai Kohei ref->xseqno &= ~XREF_DELETE_MARKER; 11608a13695cSKaiGai Kohei } 1161aa98d7cfSKaiGai Kohei goto out; 1162aa98d7cfSKaiGai Kohei } 1163aa98d7cfSKaiGai Kohei goto found; 1164aa98d7cfSKaiGai Kohei } 1165aa98d7cfSKaiGai Kohei } 1166aa98d7cfSKaiGai Kohei /* not found */ 1167aa98d7cfSKaiGai Kohei if (flags & XATTR_REPLACE) { 1168aa98d7cfSKaiGai Kohei rc = -ENODATA; 1169aa98d7cfSKaiGai Kohei goto out; 1170aa98d7cfSKaiGai Kohei } 1171aa98d7cfSKaiGai Kohei if (!buffer) { 1172c9f700f8SKaiGai Kohei rc = -ENODATA; 1173aa98d7cfSKaiGai Kohei goto out; 1174aa98d7cfSKaiGai Kohei } 1175aa98d7cfSKaiGai Kohei found: 11769fe4854cSDavid Woodhouse xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1177aa98d7cfSKaiGai Kohei if (IS_ERR(xd)) { 1178aa98d7cfSKaiGai Kohei rc = PTR_ERR(xd); 1179aa98d7cfSKaiGai Kohei goto out; 1180aa98d7cfSKaiGai Kohei } 1181aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1182aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1183aa98d7cfSKaiGai Kohei 1184aa98d7cfSKaiGai Kohei /* create xattr_ref */ 1185aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xref)); 11869fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1187aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1188c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 1189aa98d7cfSKaiGai Kohei if (rc) { 1190aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1191c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 1192aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1193aa98d7cfSKaiGai Kohei return rc; 1194aa98d7cfSKaiGai Kohei } 11958f2b6f49SKaiGai Kohei if (ref) 11968f2b6f49SKaiGai Kohei *pref = ref->next; 11979fe4854cSDavid Woodhouse newref = create_xattr_ref(c, ic, xd); 1198aa98d7cfSKaiGai Kohei if (IS_ERR(newref)) { 11998f2b6f49SKaiGai Kohei if (ref) { 12008f2b6f49SKaiGai Kohei ref->next = ic->xref; 12018f2b6f49SKaiGai Kohei ic->xref = ref; 12028f2b6f49SKaiGai Kohei } 1203aa98d7cfSKaiGai Kohei rc = PTR_ERR(newref); 1204c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 1205aa98d7cfSKaiGai Kohei } else if (ref) { 12068a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1207aa98d7cfSKaiGai Kohei } 1208aa98d7cfSKaiGai Kohei out: 1209aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1210aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1211aa98d7cfSKaiGai Kohei return rc; 1212aa98d7cfSKaiGai Kohei } 1213aa98d7cfSKaiGai Kohei 1214aa98d7cfSKaiGai Kohei /* -------- garbage collector functions ------------- 1215c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1216aa98d7cfSKaiGai Kohei * is used to move xdatum into new node. 1217c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1218aa98d7cfSKaiGai Kohei * is used to move xref into new node. 1219aa98d7cfSKaiGai Kohei * jffs2_verify_xattr(c) 1220aa98d7cfSKaiGai Kohei * is used to call do_verify_xattr_datum() before garbage collecting. 12218a13695cSKaiGai Kohei * jffs2_release_xattr_datum(c, xd) 12228a13695cSKaiGai Kohei * is used to release an in-memory object of xdatum. 12238a13695cSKaiGai Kohei * jffs2_release_xattr_ref(c, ref) 12248a13695cSKaiGai Kohei * is used to release an in-memory object of xref. 1225aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 1226c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1227c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1228aa98d7cfSKaiGai Kohei { 12299fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1230c9f700f8SKaiGai Kohei int rc = 0; 1231aa98d7cfSKaiGai Kohei 1232084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1233c9f700f8SKaiGai Kohei if (xd->node != raw) 1234c9f700f8SKaiGai Kohei goto out; 12358a13695cSKaiGai Kohei if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1236c9f700f8SKaiGai Kohei goto out; 1237aa98d7cfSKaiGai Kohei 1238aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 12398a13695cSKaiGai Kohei if (unlikely(rc)) { 12408a13695cSKaiGai Kohei rc = (rc > 0) ? 0 : rc; 1241084702e0SKaiGai Kohei goto out; 1242aa98d7cfSKaiGai Kohei } 12438a13695cSKaiGai Kohei old_ofs = ref_offset(xd->node); 12448a13695cSKaiGai Kohei totlen = PAD(sizeof(struct jffs2_raw_xattr) 12458a13695cSKaiGai Kohei + xd->name_len + 1 + xd->value_len); 12469fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1247c9f700f8SKaiGai Kohei if (rc) { 1248c9f700f8SKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1249084702e0SKaiGai Kohei goto out; 1250aa98d7cfSKaiGai Kohei } 12519fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 1252aa98d7cfSKaiGai Kohei if (!rc) 1253aa98d7cfSKaiGai Kohei dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1254aa98d7cfSKaiGai Kohei xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1255084702e0SKaiGai Kohei out: 1256c9f700f8SKaiGai Kohei if (!rc) 1257c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1258084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1259aa98d7cfSKaiGai Kohei return rc; 1260aa98d7cfSKaiGai Kohei } 1261aa98d7cfSKaiGai Kohei 1262c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1263c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1264aa98d7cfSKaiGai Kohei { 12659fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1266c9f700f8SKaiGai Kohei int rc = 0; 1267aa98d7cfSKaiGai Kohei 1268084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1269aa98d7cfSKaiGai Kohei BUG_ON(!ref->node); 1270aa98d7cfSKaiGai Kohei 1271c9f700f8SKaiGai Kohei if (ref->node != raw) 1272c9f700f8SKaiGai Kohei goto out; 1273c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1274084702e0SKaiGai Kohei goto out; 1275084702e0SKaiGai Kohei 1276c9f700f8SKaiGai Kohei old_ofs = ref_offset(ref->node); 1277c9f700f8SKaiGai Kohei totlen = ref_totlen(c, c->gcblock, ref->node); 1278c9f700f8SKaiGai Kohei 12799fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1280c9f700f8SKaiGai Kohei if (rc) { 1281c9f700f8SKaiGai Kohei JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 12828e24eea7SHarvey Harrison __func__, rc, totlen); 1283084702e0SKaiGai Kohei goto out; 1284aa98d7cfSKaiGai Kohei } 12859fe4854cSDavid Woodhouse rc = save_xattr_ref(c, ref); 1286aa98d7cfSKaiGai Kohei if (!rc) 1287aa98d7cfSKaiGai Kohei dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1288aa98d7cfSKaiGai Kohei ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1289084702e0SKaiGai Kohei out: 1290c9f700f8SKaiGai Kohei if (!rc) 1291c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1292084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1293aa98d7cfSKaiGai Kohei return rc; 1294aa98d7cfSKaiGai Kohei } 1295aa98d7cfSKaiGai Kohei 1296aa98d7cfSKaiGai Kohei int jffs2_verify_xattr(struct jffs2_sb_info *c) 1297aa98d7cfSKaiGai Kohei { 1298aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 1299c9f700f8SKaiGai Kohei struct jffs2_eraseblock *jeb; 1300c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 1301c9f700f8SKaiGai Kohei uint32_t totlen; 1302aa98d7cfSKaiGai Kohei int rc; 1303aa98d7cfSKaiGai Kohei 1304aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1305aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1306aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 1307c9f700f8SKaiGai Kohei if (rc < 0) 1308c9f700f8SKaiGai Kohei continue; 1309aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 1310c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 1311c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1312c9f700f8SKaiGai Kohei if (ref_flags(raw) != REF_UNCHECKED) 1313c9f700f8SKaiGai Kohei continue; 1314c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1315c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 1316c9f700f8SKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 1317c9f700f8SKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1318c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) 1319c9f700f8SKaiGai Kohei | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1320aa98d7cfSKaiGai Kohei } 13218a13695cSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_DEAD) 1322c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_dead_list); 1323c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1324aa98d7cfSKaiGai Kohei } 1325aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1326aa98d7cfSKaiGai Kohei return list_empty(&c->xattr_unchecked) ? 1 : 0; 1327aa98d7cfSKaiGai Kohei } 1328c9f700f8SKaiGai Kohei 1329c9f700f8SKaiGai Kohei void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1330c9f700f8SKaiGai Kohei { 1331c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 13322c887e23SKaiGai Kohei if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1333c9f700f8SKaiGai Kohei return; 1334c9f700f8SKaiGai Kohei 1335c9f700f8SKaiGai Kohei list_del(&xd->xindex); 1336c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 1337c9f700f8SKaiGai Kohei } 1338c9f700f8SKaiGai Kohei 1339c9f700f8SKaiGai Kohei void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1340c9f700f8SKaiGai Kohei { 1341c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 1342c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp, **ptmp; 1343c9f700f8SKaiGai Kohei 1344c9f700f8SKaiGai Kohei if (ref->node != (void *)ref) 1345c9f700f8SKaiGai Kohei return; 1346c9f700f8SKaiGai Kohei 1347c9f700f8SKaiGai Kohei for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1348c9f700f8SKaiGai Kohei if (ref == tmp) { 1349c9f700f8SKaiGai Kohei *ptmp = tmp->next; 1350c9f700f8SKaiGai Kohei break; 1351c9f700f8SKaiGai Kohei } 1352c9f700f8SKaiGai Kohei } 13538a13695cSKaiGai Kohei jffs2_free_xattr_ref(ref); 1354c9f700f8SKaiGai Kohei } 1355