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 12aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 13aa98d7cfSKaiGai Kohei #include <linux/slab.h> 14aa98d7cfSKaiGai Kohei #include <linux/fs.h> 15aa98d7cfSKaiGai Kohei #include <linux/time.h> 16aa98d7cfSKaiGai Kohei #include <linux/pagemap.h> 17aa98d7cfSKaiGai Kohei #include <linux/highmem.h> 18aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 19aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 20aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 21aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 22aa98d7cfSKaiGai Kohei #include "nodelist.h" 23aa98d7cfSKaiGai Kohei /* -------- xdatum related functions ---------------- 24aa98d7cfSKaiGai Kohei * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 25aa98d7cfSKaiGai Kohei * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 26aa98d7cfSKaiGai Kohei * the index of the xattr name/value pair cache (c->xattrindex). 27c9f700f8SKaiGai Kohei * is_xattr_datum_unchecked(c, xd) 28c9f700f8SKaiGai Kohei * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 29c9f700f8SKaiGai Kohei * unchecked, it returns 0. 30aa98d7cfSKaiGai Kohei * unload_xattr_datum(c, xd) 31aa98d7cfSKaiGai Kohei * is used to release xattr name/value pair and detach from c->xattrindex. 32aa98d7cfSKaiGai Kohei * reclaim_xattr_datum(c) 33aa98d7cfSKaiGai Kohei * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 34af901ca1SAndré Goddard Rosa * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold 35aa98d7cfSKaiGai Kohei * is hard coded as 32KiB. 36aa98d7cfSKaiGai Kohei * do_verify_xattr_datum(c, xd) 37aa98d7cfSKaiGai Kohei * is used to load the xdatum informations without name/value pair from the medium. 38aa98d7cfSKaiGai Kohei * It's necessary once, because those informations are not collected during mounting 39aa98d7cfSKaiGai Kohei * process when EBS is enabled. 40aa98d7cfSKaiGai Kohei * 0 will be returned, if success. An negative return value means recoverable error, and 41aa98d7cfSKaiGai Kohei * positive return value means unrecoverable error. Thus, caller must remove this xdatum 42aa98d7cfSKaiGai Kohei * and xref when it returned positive value. 43aa98d7cfSKaiGai Kohei * do_load_xattr_datum(c, xd) 44aa98d7cfSKaiGai Kohei * is used to load name/value pair from the medium. 45aa98d7cfSKaiGai Kohei * The meanings of return value is same as do_verify_xattr_datum(). 46aa98d7cfSKaiGai Kohei * load_xattr_datum(c, xd) 47aa98d7cfSKaiGai Kohei * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 48aa98d7cfSKaiGai Kohei * If xd need to call do_verify_xattr_datum() at first, it's called before calling 49aa98d7cfSKaiGai Kohei * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 509fe4854cSDavid Woodhouse * save_xattr_datum(c, xd) 51aa98d7cfSKaiGai Kohei * is used to write xdatum to medium. xd->version will be incremented. 529fe4854cSDavid Woodhouse * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 53aa98d7cfSKaiGai Kohei * is used to create new xdatum and write to medium. 54c6e8c6ccSKaiGai Kohei * unrefer_xattr_datum(c, xd) 55c6e8c6ccSKaiGai Kohei * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD 56c6e8c6ccSKaiGai Kohei * is set on xd->flags and chained xattr_dead_list or release it immediately. 57c6e8c6ccSKaiGai Kohei * In the first case, the garbage collector release it later. 58aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 59aa98d7cfSKaiGai Kohei static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 60aa98d7cfSKaiGai Kohei { 61aa98d7cfSKaiGai Kohei int name_len = strlen(xname); 62aa98d7cfSKaiGai Kohei 63aa98d7cfSKaiGai Kohei return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 64aa98d7cfSKaiGai Kohei } 65aa98d7cfSKaiGai Kohei 66c9f700f8SKaiGai Kohei static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 67c9f700f8SKaiGai Kohei { 68c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 69c9f700f8SKaiGai Kohei int rc = 0; 70c9f700f8SKaiGai Kohei 71c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 72c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 73c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 74c9f700f8SKaiGai Kohei rc = 1; 75c9f700f8SKaiGai Kohei break; 76c9f700f8SKaiGai Kohei } 77c9f700f8SKaiGai Kohei } 78c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 79c9f700f8SKaiGai Kohei return rc; 80c9f700f8SKaiGai Kohei } 81c9f700f8SKaiGai Kohei 82aa98d7cfSKaiGai Kohei static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 83aa98d7cfSKaiGai Kohei { 84aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 858e24eea7SHarvey Harrison D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); 86aa98d7cfSKaiGai Kohei if (xd->xname) { 87aa98d7cfSKaiGai Kohei c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 88aa98d7cfSKaiGai Kohei kfree(xd->xname); 89aa98d7cfSKaiGai Kohei } 90aa98d7cfSKaiGai Kohei 91aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 92aa98d7cfSKaiGai Kohei xd->hashkey = 0; 93aa98d7cfSKaiGai Kohei xd->xname = NULL; 94aa98d7cfSKaiGai Kohei xd->xvalue = NULL; 95aa98d7cfSKaiGai Kohei } 96aa98d7cfSKaiGai Kohei 97aa98d7cfSKaiGai Kohei static void reclaim_xattr_datum(struct jffs2_sb_info *c) 98aa98d7cfSKaiGai Kohei { 99aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 100aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 101aa98d7cfSKaiGai Kohei uint32_t target, before; 102aa98d7cfSKaiGai Kohei static int index = 0; 103aa98d7cfSKaiGai Kohei int count; 104aa98d7cfSKaiGai Kohei 105aa98d7cfSKaiGai Kohei if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 106aa98d7cfSKaiGai Kohei return; 107aa98d7cfSKaiGai Kohei 108aa98d7cfSKaiGai Kohei before = c->xdatum_mem_usage; 109aa98d7cfSKaiGai Kohei target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 110aa98d7cfSKaiGai Kohei for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 111aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 112aa98d7cfSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_HOT) { 113aa98d7cfSKaiGai Kohei xd->flags &= ~JFFS2_XFLAGS_HOT; 114aa98d7cfSKaiGai Kohei } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 115aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 116aa98d7cfSKaiGai Kohei } 117aa98d7cfSKaiGai Kohei if (c->xdatum_mem_usage <= target) 118aa98d7cfSKaiGai Kohei goto out; 119aa98d7cfSKaiGai Kohei } 120aa98d7cfSKaiGai Kohei index = (index+1) % XATTRINDEX_HASHSIZE; 121aa98d7cfSKaiGai Kohei } 122aa98d7cfSKaiGai Kohei out: 123aa98d7cfSKaiGai Kohei JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 124aa98d7cfSKaiGai Kohei before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 125aa98d7cfSKaiGai Kohei } 126aa98d7cfSKaiGai Kohei 127aa98d7cfSKaiGai Kohei static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 128aa98d7cfSKaiGai Kohei { 129aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 130aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 131c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 132aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr rx; 133aa98d7cfSKaiGai Kohei size_t readlen; 134c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 135aa98d7cfSKaiGai Kohei int rc; 136aa98d7cfSKaiGai Kohei 137c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 138c9f700f8SKaiGai Kohei offset = ref_offset(xd->node); 139c9f700f8SKaiGai Kohei if (ref_flags(xd->node) == REF_PRISTINE) 140c9f700f8SKaiGai Kohei goto complete; 141c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 142aa98d7cfSKaiGai Kohei 143c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 144aa98d7cfSKaiGai Kohei if (rc || readlen != sizeof(rx)) { 14589291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 146c9f700f8SKaiGai Kohei rc, sizeof(rx), readlen, offset); 147aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 148aa98d7cfSKaiGai Kohei } 149aa98d7cfSKaiGai Kohei crc = crc32(0, &rx, sizeof(rx) - 4); 150aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx.node_crc)) { 151aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 152c9f700f8SKaiGai Kohei offset, je32_to_cpu(rx.hdr_crc), crc); 153c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 154aa98d7cfSKaiGai Kohei return EIO; 155aa98d7cfSKaiGai Kohei } 1568a13695cSKaiGai Kohei totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 157aa98d7cfSKaiGai Kohei if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 158aa98d7cfSKaiGai Kohei || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 159aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.totlen) != totlen 160aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.xid) != xd->xid 161aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.version) != xd->version) { 162aa98d7cfSKaiGai Kohei JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 163aa98d7cfSKaiGai Kohei "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 164c9f700f8SKaiGai Kohei offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, 165aa98d7cfSKaiGai Kohei je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, 166aa98d7cfSKaiGai Kohei je32_to_cpu(rx.totlen), totlen, 167aa98d7cfSKaiGai Kohei je32_to_cpu(rx.xid), xd->xid, 168aa98d7cfSKaiGai Kohei je32_to_cpu(rx.version), xd->version); 169c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 170aa98d7cfSKaiGai Kohei return EIO; 171aa98d7cfSKaiGai Kohei } 172aa98d7cfSKaiGai Kohei xd->xprefix = rx.xprefix; 173aa98d7cfSKaiGai Kohei xd->name_len = rx.name_len; 174aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx.value_len); 175aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx.data_crc); 176aa98d7cfSKaiGai Kohei 177aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 178c9f700f8SKaiGai Kohei complete: 179c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 180c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 181c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 182c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 183aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 184aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 185c9f700f8SKaiGai Kohei } 186c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 187c9f700f8SKaiGai Kohei } 188aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 189aa98d7cfSKaiGai Kohei 190aa98d7cfSKaiGai Kohei /* unchecked xdatum is chained with c->xattr_unchecked */ 191aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 192aa98d7cfSKaiGai Kohei 193aa98d7cfSKaiGai Kohei dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", 194aa98d7cfSKaiGai Kohei xd->xid, xd->version); 195aa98d7cfSKaiGai Kohei 196aa98d7cfSKaiGai Kohei return 0; 197aa98d7cfSKaiGai Kohei } 198aa98d7cfSKaiGai Kohei 199aa98d7cfSKaiGai Kohei static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 200aa98d7cfSKaiGai Kohei { 201aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 202aa98d7cfSKaiGai Kohei char *data; 203aa98d7cfSKaiGai Kohei size_t readlen; 204aa98d7cfSKaiGai Kohei uint32_t crc, length; 205aa98d7cfSKaiGai Kohei int i, ret, retry = 0; 206aa98d7cfSKaiGai Kohei 207aa98d7cfSKaiGai Kohei BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 208aa98d7cfSKaiGai Kohei BUG_ON(!list_empty(&xd->xindex)); 209aa98d7cfSKaiGai Kohei retry: 210aa98d7cfSKaiGai Kohei length = xd->name_len + 1 + xd->value_len; 211aa98d7cfSKaiGai Kohei data = kmalloc(length, GFP_KERNEL); 212aa98d7cfSKaiGai Kohei if (!data) 213aa98d7cfSKaiGai Kohei return -ENOMEM; 214aa98d7cfSKaiGai Kohei 215aa98d7cfSKaiGai Kohei ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 216aa98d7cfSKaiGai Kohei length, &readlen, data); 217aa98d7cfSKaiGai Kohei 218aa98d7cfSKaiGai Kohei if (ret || length!=readlen) { 21989291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 220aa98d7cfSKaiGai Kohei ret, length, readlen, ref_offset(xd->node)); 221aa98d7cfSKaiGai Kohei kfree(data); 222aa98d7cfSKaiGai Kohei return ret ? ret : -EIO; 223aa98d7cfSKaiGai Kohei } 224aa98d7cfSKaiGai Kohei 225aa98d7cfSKaiGai Kohei data[xd->name_len] = '\0'; 226aa98d7cfSKaiGai Kohei crc = crc32(0, data, length); 227aa98d7cfSKaiGai Kohei if (crc != xd->data_crc) { 228aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" 229aa98d7cfSKaiGai Kohei " at %#08x, read: 0x%08x calculated: 0x%08x\n", 230aa98d7cfSKaiGai Kohei ref_offset(xd->node), xd->data_crc, crc); 231aa98d7cfSKaiGai Kohei kfree(data); 232c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 233aa98d7cfSKaiGai Kohei return EIO; 234aa98d7cfSKaiGai Kohei } 235aa98d7cfSKaiGai Kohei 236aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 237aa98d7cfSKaiGai Kohei xd->xname = data; 238aa98d7cfSKaiGai Kohei xd->xvalue = data + xd->name_len+1; 239aa98d7cfSKaiGai Kohei 240aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += length; 241aa98d7cfSKaiGai Kohei 242aa98d7cfSKaiGai Kohei xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 243aa98d7cfSKaiGai Kohei i = xd->hashkey % XATTRINDEX_HASHSIZE; 244aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 245aa98d7cfSKaiGai Kohei if (!retry) { 246aa98d7cfSKaiGai Kohei retry = 1; 247aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 248aa98d7cfSKaiGai Kohei if (!xd->xname) 249aa98d7cfSKaiGai Kohei goto retry; 250aa98d7cfSKaiGai Kohei } 251aa98d7cfSKaiGai Kohei 252aa98d7cfSKaiGai Kohei dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 253aa98d7cfSKaiGai Kohei xd->xid, xd->xprefix, xd->xname); 254aa98d7cfSKaiGai Kohei 255aa98d7cfSKaiGai Kohei return 0; 256aa98d7cfSKaiGai Kohei } 257aa98d7cfSKaiGai Kohei 258aa98d7cfSKaiGai Kohei static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 259aa98d7cfSKaiGai Kohei { 260aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem); 261aa98d7cfSKaiGai Kohei * rc < 0 : recoverable error, try again 262aa98d7cfSKaiGai Kohei * rc = 0 : success 263aa98d7cfSKaiGai Kohei * rc > 0 : Unrecoverable error, this node should be deleted. 264aa98d7cfSKaiGai Kohei */ 265aa98d7cfSKaiGai Kohei int rc = 0; 266c9f700f8SKaiGai Kohei 2678a13695cSKaiGai Kohei BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 268c9f700f8SKaiGai Kohei if (xd->xname) 269c9f700f8SKaiGai Kohei return 0; 270c9f700f8SKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_INVALID) 271aa98d7cfSKaiGai Kohei return EIO; 272c9f700f8SKaiGai Kohei if (unlikely(is_xattr_datum_unchecked(c, xd))) 273aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 274aa98d7cfSKaiGai Kohei if (!rc) 275aa98d7cfSKaiGai Kohei rc = do_load_xattr_datum(c, xd); 276aa98d7cfSKaiGai Kohei return rc; 277aa98d7cfSKaiGai Kohei } 278aa98d7cfSKaiGai Kohei 2799fe4854cSDavid Woodhouse static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 280aa98d7cfSKaiGai Kohei { 281aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 2822f785402SDavid Woodhouse struct jffs2_raw_xattr rx; 283aa98d7cfSKaiGai Kohei struct kvec vecs[2]; 28489291a9dSDavid Woodhouse size_t length; 2858a13695cSKaiGai Kohei int rc, totlen; 2869fe4854cSDavid Woodhouse uint32_t phys_ofs = write_ofs(c); 287aa98d7cfSKaiGai Kohei 2888a13695cSKaiGai Kohei BUG_ON(!xd->xname); 2898a13695cSKaiGai Kohei BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 290aa98d7cfSKaiGai Kohei 291aa98d7cfSKaiGai Kohei vecs[0].iov_base = ℞ 2928a13695cSKaiGai Kohei vecs[0].iov_len = sizeof(rx); 293aa98d7cfSKaiGai Kohei vecs[1].iov_base = xd->xname; 294aa98d7cfSKaiGai Kohei vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 2958a13695cSKaiGai Kohei totlen = vecs[0].iov_len + vecs[1].iov_len; 2968a13695cSKaiGai Kohei 297aa98d7cfSKaiGai Kohei /* Setup raw-xattr */ 298c9f700f8SKaiGai Kohei memset(&rx, 0, sizeof(rx)); 299aa98d7cfSKaiGai Kohei rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 300aa98d7cfSKaiGai Kohei rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 301aa98d7cfSKaiGai Kohei rx.totlen = cpu_to_je32(PAD(totlen)); 302aa98d7cfSKaiGai Kohei rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 303aa98d7cfSKaiGai Kohei 304aa98d7cfSKaiGai Kohei rx.xid = cpu_to_je32(xd->xid); 305aa98d7cfSKaiGai Kohei rx.version = cpu_to_je32(++xd->version); 306aa98d7cfSKaiGai Kohei rx.xprefix = xd->xprefix; 307aa98d7cfSKaiGai Kohei rx.name_len = xd->name_len; 308aa98d7cfSKaiGai Kohei rx.value_len = cpu_to_je16(xd->value_len); 309aa98d7cfSKaiGai Kohei rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 310aa98d7cfSKaiGai Kohei rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 311aa98d7cfSKaiGai Kohei 3128a13695cSKaiGai Kohei rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 313aa98d7cfSKaiGai Kohei if (rc || totlen != length) { 31489291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 315aa98d7cfSKaiGai Kohei rc, totlen, length, phys_ofs); 316aa98d7cfSKaiGai Kohei rc = rc ? rc : -EIO; 3172f785402SDavid Woodhouse if (length) 3182f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 3192f785402SDavid Woodhouse 320aa98d7cfSKaiGai Kohei return rc; 321aa98d7cfSKaiGai Kohei } 322aa98d7cfSKaiGai Kohei /* success */ 323c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 324aa98d7cfSKaiGai Kohei 325aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 326aa98d7cfSKaiGai Kohei xd->xid, xd->version, xd->xprefix, xd->xname); 327aa98d7cfSKaiGai Kohei 328aa98d7cfSKaiGai Kohei return 0; 329aa98d7cfSKaiGai Kohei } 330aa98d7cfSKaiGai Kohei 331aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 332aa98d7cfSKaiGai Kohei int xprefix, const char *xname, 3339fe4854cSDavid Woodhouse const char *xvalue, int xsize) 334aa98d7cfSKaiGai Kohei { 335aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 336aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 337aa98d7cfSKaiGai Kohei uint32_t hashkey, name_len; 338aa98d7cfSKaiGai Kohei char *data; 339aa98d7cfSKaiGai Kohei int i, rc; 340aa98d7cfSKaiGai Kohei 341aa98d7cfSKaiGai Kohei /* Search xattr_datum has same xname/xvalue by index */ 342aa98d7cfSKaiGai Kohei hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 343aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 344aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 345aa98d7cfSKaiGai Kohei if (xd->hashkey==hashkey 346aa98d7cfSKaiGai Kohei && xd->xprefix==xprefix 347aa98d7cfSKaiGai Kohei && xd->value_len==xsize 348aa98d7cfSKaiGai Kohei && !strcmp(xd->xname, xname) 349aa98d7cfSKaiGai Kohei && !memcmp(xd->xvalue, xvalue, xsize)) { 3502c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 351aa98d7cfSKaiGai Kohei return xd; 352aa98d7cfSKaiGai Kohei } 353aa98d7cfSKaiGai Kohei } 354aa98d7cfSKaiGai Kohei 355aa98d7cfSKaiGai Kohei /* Not found, Create NEW XATTR-Cache */ 356aa98d7cfSKaiGai Kohei name_len = strlen(xname); 357aa98d7cfSKaiGai Kohei 358aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 359aa98d7cfSKaiGai Kohei if (!xd) 360aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 361aa98d7cfSKaiGai Kohei 362aa98d7cfSKaiGai Kohei data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 363aa98d7cfSKaiGai Kohei if (!data) { 364aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 365aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 366aa98d7cfSKaiGai Kohei } 367aa98d7cfSKaiGai Kohei strcpy(data, xname); 368aa98d7cfSKaiGai Kohei memcpy(data + name_len + 1, xvalue, xsize); 369aa98d7cfSKaiGai Kohei 3702c887e23SKaiGai Kohei atomic_set(&xd->refcnt, 1); 371aa98d7cfSKaiGai Kohei xd->xid = ++c->highest_xid; 372aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 373aa98d7cfSKaiGai Kohei xd->xprefix = xprefix; 374aa98d7cfSKaiGai Kohei 375aa98d7cfSKaiGai Kohei xd->hashkey = hashkey; 376aa98d7cfSKaiGai Kohei xd->xname = data; 377aa98d7cfSKaiGai Kohei xd->xvalue = data + name_len + 1; 378aa98d7cfSKaiGai Kohei xd->name_len = name_len; 379aa98d7cfSKaiGai Kohei xd->value_len = xsize; 380aa98d7cfSKaiGai Kohei xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 381aa98d7cfSKaiGai Kohei 3829fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 383aa98d7cfSKaiGai Kohei if (rc) { 384aa98d7cfSKaiGai Kohei kfree(xd->xname); 385aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 386aa98d7cfSKaiGai Kohei return ERR_PTR(rc); 387aa98d7cfSKaiGai Kohei } 388aa98d7cfSKaiGai Kohei 389aa98d7cfSKaiGai Kohei /* Insert Hash Index */ 390aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 391aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 392aa98d7cfSKaiGai Kohei 393aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 394aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 395aa98d7cfSKaiGai Kohei 396aa98d7cfSKaiGai Kohei return xd; 397aa98d7cfSKaiGai Kohei } 398aa98d7cfSKaiGai Kohei 399c6e8c6ccSKaiGai Kohei static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 400c9f700f8SKaiGai Kohei { 401c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 402c6e8c6ccSKaiGai Kohei if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { 403c9f700f8SKaiGai Kohei unload_xattr_datum(c, xd); 4048a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 4058a13695cSKaiGai Kohei if (xd->node == (void *)xd) { 4068a13695cSKaiGai Kohei BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); 4078a13695cSKaiGai Kohei jffs2_free_xattr_datum(xd); 4088a13695cSKaiGai Kohei } else { 409c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_dead_list); 410c9f700f8SKaiGai Kohei } 411c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 412c6e8c6ccSKaiGai Kohei 413a6b1d82dSJeff Garzik dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", 414a6b1d82dSJeff Garzik xd->xid, xd->version); 415c6e8c6ccSKaiGai Kohei } 416c9f700f8SKaiGai Kohei } 417c9f700f8SKaiGai Kohei 41821b9879bSKaiGai Kohei /* -------- xref related functions ------------------ 419aa98d7cfSKaiGai Kohei * verify_xattr_ref(c, ref) 420aa98d7cfSKaiGai Kohei * is used to load xref information from medium. Because summary data does not 421aa98d7cfSKaiGai Kohei * contain xid/ino, it's necessary to verify once while mounting process. 4229fe4854cSDavid Woodhouse * save_xattr_ref(c, ref) 4238a13695cSKaiGai Kohei * is used to write xref to medium. If delete marker is marked, it write 4248a13695cSKaiGai Kohei * a delete marker of xref into medium. 4259fe4854cSDavid Woodhouse * create_xattr_ref(c, ic, xd) 426aa98d7cfSKaiGai Kohei * is used to create a new xref and write to medium. 4278a13695cSKaiGai Kohei * delete_xattr_ref(c, ref) 4288a13695cSKaiGai Kohei * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 4298a13695cSKaiGai Kohei * and allows GC to reclaim those physical nodes. 430aa98d7cfSKaiGai Kohei * jffs2_xattr_delete_inode(c, ic) 431aa98d7cfSKaiGai Kohei * is called to remove xrefs related to obsolete inode when inode is unlinked. 432aa98d7cfSKaiGai Kohei * jffs2_xattr_free_inode(c, ic) 433aa98d7cfSKaiGai Kohei * is called to release xattr related objects when unmounting. 4348f2b6f49SKaiGai Kohei * check_xattr_ref_inode(c, ic) 435aa98d7cfSKaiGai Kohei * is used to confirm inode does not have duplicate xattr name/value pair. 436aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 437aa98d7cfSKaiGai Kohei static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 438aa98d7cfSKaiGai Kohei { 439aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 440c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 441aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 442aa98d7cfSKaiGai Kohei size_t readlen; 443c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 444aa98d7cfSKaiGai Kohei int rc; 445aa98d7cfSKaiGai Kohei 446c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 447c9f700f8SKaiGai Kohei if (ref_flags(ref->node) != REF_UNCHECKED) 448c9f700f8SKaiGai Kohei goto complete; 449c9f700f8SKaiGai Kohei offset = ref_offset(ref->node); 450c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 451aa98d7cfSKaiGai Kohei 452c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 453aa98d7cfSKaiGai Kohei if (rc || sizeof(rr) != readlen) { 45489291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 455c9f700f8SKaiGai Kohei rc, sizeof(rr), readlen, offset); 456aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 457aa98d7cfSKaiGai Kohei } 458aa98d7cfSKaiGai Kohei /* obsolete node */ 459aa98d7cfSKaiGai Kohei crc = crc32(0, &rr, sizeof(rr) - 4); 460aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr.node_crc)) { 461aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 462c9f700f8SKaiGai Kohei offset, je32_to_cpu(rr.node_crc), crc); 463aa98d7cfSKaiGai Kohei return EIO; 464aa98d7cfSKaiGai Kohei } 465aa98d7cfSKaiGai Kohei if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK 466aa98d7cfSKaiGai Kohei || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF 467aa98d7cfSKaiGai Kohei || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { 468aa98d7cfSKaiGai Kohei JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 46989291a9dSDavid Woodhouse "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 470c9f700f8SKaiGai Kohei offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 471aa98d7cfSKaiGai Kohei je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 472aa98d7cfSKaiGai Kohei je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 473aa98d7cfSKaiGai Kohei return EIO; 474aa98d7cfSKaiGai Kohei } 475aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr.ino); 476aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr.xid); 477c9f700f8SKaiGai Kohei ref->xseqno = je32_to_cpu(rr.xseqno); 478c9f700f8SKaiGai Kohei if (ref->xseqno > c->highest_xseqno) 479c9f700f8SKaiGai Kohei c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 480aa98d7cfSKaiGai Kohei 481aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 482c9f700f8SKaiGai Kohei complete: 483c9f700f8SKaiGai Kohei for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 484c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 485c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 486c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 487aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 488aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 489c9f700f8SKaiGai Kohei } 490c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 491c9f700f8SKaiGai Kohei } 492aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 493aa98d7cfSKaiGai Kohei 494aa98d7cfSKaiGai Kohei dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 495aa98d7cfSKaiGai Kohei ref->ino, ref->xid, ref_offset(ref->node)); 496aa98d7cfSKaiGai Kohei return 0; 497aa98d7cfSKaiGai Kohei } 498aa98d7cfSKaiGai Kohei 4999fe4854cSDavid Woodhouse static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 500aa98d7cfSKaiGai Kohei { 501aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 502aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 50389291a9dSDavid Woodhouse size_t length; 504c9f700f8SKaiGai Kohei uint32_t xseqno, phys_ofs = write_ofs(c); 505aa98d7cfSKaiGai Kohei int ret; 506aa98d7cfSKaiGai Kohei 507aa98d7cfSKaiGai Kohei rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 508aa98d7cfSKaiGai Kohei rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 509aa98d7cfSKaiGai Kohei rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 510aa98d7cfSKaiGai Kohei rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 511aa98d7cfSKaiGai Kohei 512c9f700f8SKaiGai Kohei xseqno = (c->highest_xseqno += 2); 513c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 514c9f700f8SKaiGai Kohei xseqno |= XREF_DELETE_MARKER; 515c9f700f8SKaiGai Kohei rr.ino = cpu_to_je32(ref->ino); 516c9f700f8SKaiGai Kohei rr.xid = cpu_to_je32(ref->xid); 517c9f700f8SKaiGai Kohei } else { 518aa98d7cfSKaiGai Kohei rr.ino = cpu_to_je32(ref->ic->ino); 519aa98d7cfSKaiGai Kohei rr.xid = cpu_to_je32(ref->xd->xid); 520c9f700f8SKaiGai Kohei } 521c9f700f8SKaiGai Kohei rr.xseqno = cpu_to_je32(xseqno); 522aa98d7cfSKaiGai Kohei rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 523aa98d7cfSKaiGai Kohei 524aa98d7cfSKaiGai Kohei ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 525aa98d7cfSKaiGai Kohei if (ret || sizeof(rr) != length) { 52689291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 527aa98d7cfSKaiGai Kohei ret, sizeof(rr), length, phys_ofs); 528aa98d7cfSKaiGai Kohei ret = ret ? ret : -EIO; 5292f785402SDavid Woodhouse if (length) 5302f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 5312f785402SDavid Woodhouse 532aa98d7cfSKaiGai Kohei return ret; 533aa98d7cfSKaiGai Kohei } 534c9f700f8SKaiGai Kohei /* success */ 535c9f700f8SKaiGai Kohei ref->xseqno = xseqno; 536c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 537aa98d7cfSKaiGai Kohei 538aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 539aa98d7cfSKaiGai Kohei 540aa98d7cfSKaiGai Kohei return 0; 541aa98d7cfSKaiGai Kohei } 542aa98d7cfSKaiGai Kohei 543aa98d7cfSKaiGai Kohei static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 5449fe4854cSDavid Woodhouse struct jffs2_xattr_datum *xd) 545aa98d7cfSKaiGai Kohei { 546aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 547aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 548aa98d7cfSKaiGai Kohei int ret; 549aa98d7cfSKaiGai Kohei 550aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 551aa98d7cfSKaiGai Kohei if (!ref) 552aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 553aa98d7cfSKaiGai Kohei ref->ic = ic; 554aa98d7cfSKaiGai Kohei ref->xd = xd; 555aa98d7cfSKaiGai Kohei 5569fe4854cSDavid Woodhouse ret = save_xattr_ref(c, ref); 557aa98d7cfSKaiGai Kohei if (ret) { 558aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 559aa98d7cfSKaiGai Kohei return ERR_PTR(ret); 560aa98d7cfSKaiGai Kohei } 561aa98d7cfSKaiGai Kohei 562aa98d7cfSKaiGai Kohei /* Chain to inode */ 5638f2b6f49SKaiGai Kohei ref->next = ic->xref; 5648f2b6f49SKaiGai Kohei ic->xref = ref; 565aa98d7cfSKaiGai Kohei 566aa98d7cfSKaiGai Kohei return ref; /* success */ 567aa98d7cfSKaiGai Kohei } 568aa98d7cfSKaiGai Kohei 5698a13695cSKaiGai Kohei static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 570c9f700f8SKaiGai Kohei { 571c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 572c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 573c9f700f8SKaiGai Kohei 574c9f700f8SKaiGai Kohei xd = ref->xd; 5758a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 576c9f700f8SKaiGai Kohei ref->ino = ref->ic->ino; 577c9f700f8SKaiGai Kohei ref->xid = ref->xd->xid; 578c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 579c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 580c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 581c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 582c9f700f8SKaiGai Kohei 5838a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 5848a13695cSKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 585c9f700f8SKaiGai Kohei 586c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 587c9f700f8SKaiGai Kohei } 588c9f700f8SKaiGai Kohei 589aa98d7cfSKaiGai Kohei void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 590aa98d7cfSKaiGai Kohei { 591aa98d7cfSKaiGai Kohei /* It's called from jffs2_clear_inode() on inode removing. 592aa98d7cfSKaiGai Kohei When an inode with XATTR is removed, those XATTRs must be removed. */ 5938a13695cSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 594aa98d7cfSKaiGai Kohei 59527c72b04SDavid Woodhouse if (!ic || ic->pino_nlink > 0) 596aa98d7cfSKaiGai Kohei return; 597aa98d7cfSKaiGai Kohei 598c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 5998a13695cSKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 6008a13695cSKaiGai Kohei _ref = ref->next; 6018a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 602c9f700f8SKaiGai Kohei } 6038a13695cSKaiGai Kohei ic->xref = NULL; 604aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 605aa98d7cfSKaiGai Kohei } 606aa98d7cfSKaiGai Kohei 607aa98d7cfSKaiGai Kohei void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 608aa98d7cfSKaiGai Kohei { 609aa98d7cfSKaiGai Kohei /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 610aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 611aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 612aa98d7cfSKaiGai Kohei 613aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 6148f2b6f49SKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 6158f2b6f49SKaiGai Kohei _ref = ref->next; 616aa98d7cfSKaiGai Kohei xd = ref->xd; 6172c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) { 618aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 619aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 620aa98d7cfSKaiGai Kohei } 621aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 622aa98d7cfSKaiGai Kohei } 6238f2b6f49SKaiGai Kohei ic->xref = NULL; 624aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 625aa98d7cfSKaiGai Kohei } 626aa98d7cfSKaiGai Kohei 6278f2b6f49SKaiGai Kohei static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 628aa98d7cfSKaiGai Kohei { 6298f2b6f49SKaiGai Kohei /* success of check_xattr_ref_inode() means taht inode (ic) dose not have 630aa98d7cfSKaiGai Kohei * duplicate name/value pairs. If duplicate name/value pair would be found, 631aa98d7cfSKaiGai Kohei * one will be removed. 632aa98d7cfSKaiGai Kohei */ 633c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 634aa98d7cfSKaiGai Kohei int rc = 0; 635aa98d7cfSKaiGai Kohei 636aa98d7cfSKaiGai Kohei if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 637aa98d7cfSKaiGai Kohei return 0; 638aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 639aa98d7cfSKaiGai Kohei retry: 640aa98d7cfSKaiGai Kohei rc = 0; 6418f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 642aa98d7cfSKaiGai Kohei if (!ref->xd->xname) { 643aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, ref->xd); 644aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 6458f2b6f49SKaiGai Kohei *pref = ref->next; 6468a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 647aa98d7cfSKaiGai Kohei goto retry; 648aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 649aa98d7cfSKaiGai Kohei goto out; 650aa98d7cfSKaiGai Kohei } 651c9f700f8SKaiGai Kohei for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 652aa98d7cfSKaiGai Kohei if (!cmp->xd->xname) { 653aa98d7cfSKaiGai Kohei ref->xd->flags |= JFFS2_XFLAGS_BIND; 654aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, cmp->xd); 655aa98d7cfSKaiGai Kohei ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 656aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 657c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6588a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 659aa98d7cfSKaiGai Kohei goto retry; 660aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 661aa98d7cfSKaiGai Kohei goto out; 662aa98d7cfSKaiGai Kohei } 663aa98d7cfSKaiGai Kohei if (ref->xd->xprefix == cmp->xd->xprefix 664aa98d7cfSKaiGai Kohei && !strcmp(ref->xd->xname, cmp->xd->xname)) { 665c9f700f8SKaiGai Kohei if (ref->xseqno > cmp->xseqno) { 666c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6678a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 668c9f700f8SKaiGai Kohei } else { 669c9f700f8SKaiGai Kohei *pref = ref->next; 6708a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 671c9f700f8SKaiGai Kohei } 672aa98d7cfSKaiGai Kohei goto retry; 673aa98d7cfSKaiGai Kohei } 674aa98d7cfSKaiGai Kohei } 675aa98d7cfSKaiGai Kohei } 676aa98d7cfSKaiGai Kohei ic->flags |= INO_FLAGS_XATTR_CHECKED; 677aa98d7cfSKaiGai Kohei out: 678aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 679aa98d7cfSKaiGai Kohei 680aa98d7cfSKaiGai Kohei return rc; 681aa98d7cfSKaiGai Kohei } 682aa98d7cfSKaiGai Kohei 683aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 684aa98d7cfSKaiGai Kohei * jffs2_init_xattr_subsystem(c) 685aa98d7cfSKaiGai Kohei * is used to initialize semaphore and list_head, and some variables. 686aa98d7cfSKaiGai Kohei * jffs2_find_xattr_datum(c, xid) 687aa98d7cfSKaiGai Kohei * is used to lookup xdatum while scanning process. 688aa98d7cfSKaiGai Kohei * jffs2_clear_xattr_subsystem(c) 689aa98d7cfSKaiGai Kohei * is used to release any xattr related objects. 690aa98d7cfSKaiGai Kohei * jffs2_build_xattr_subsystem(c) 691aa98d7cfSKaiGai Kohei * is used to associate xdatum and xref while super block building process. 692aa98d7cfSKaiGai Kohei * jffs2_setup_xattr_datum(c, xid, version) 693aa98d7cfSKaiGai Kohei * is used to insert xdatum while scanning process. 694aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 695aa98d7cfSKaiGai Kohei void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 696aa98d7cfSKaiGai Kohei { 697aa98d7cfSKaiGai Kohei int i; 698aa98d7cfSKaiGai Kohei 699aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) 700aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattrindex[i]); 701aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattr_unchecked); 702c9f700f8SKaiGai Kohei INIT_LIST_HEAD(&c->xattr_dead_list); 703c9f700f8SKaiGai Kohei c->xref_dead_list = NULL; 7048f2b6f49SKaiGai Kohei c->xref_temp = NULL; 705aa98d7cfSKaiGai Kohei 706aa98d7cfSKaiGai Kohei init_rwsem(&c->xattr_sem); 707c9f700f8SKaiGai Kohei c->highest_xid = 0; 708c9f700f8SKaiGai Kohei c->highest_xseqno = 0; 709aa98d7cfSKaiGai Kohei c->xdatum_mem_usage = 0; 710aa98d7cfSKaiGai Kohei c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 711aa98d7cfSKaiGai Kohei } 712aa98d7cfSKaiGai Kohei 713aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 714aa98d7cfSKaiGai Kohei { 715aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 716aa98d7cfSKaiGai Kohei int i = xid % XATTRINDEX_HASHSIZE; 717aa98d7cfSKaiGai Kohei 718aa98d7cfSKaiGai Kohei /* It's only used in scanning/building process. */ 719aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 720aa98d7cfSKaiGai Kohei 721aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 722aa98d7cfSKaiGai Kohei if (xd->xid==xid) 723aa98d7cfSKaiGai Kohei return xd; 724aa98d7cfSKaiGai Kohei } 725aa98d7cfSKaiGai Kohei return NULL; 726aa98d7cfSKaiGai Kohei } 727aa98d7cfSKaiGai Kohei 728aa98d7cfSKaiGai Kohei void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 729aa98d7cfSKaiGai Kohei { 730aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 731aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 732aa98d7cfSKaiGai Kohei int i; 733aa98d7cfSKaiGai Kohei 7348f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref = _ref) { 7358f2b6f49SKaiGai Kohei _ref = ref->next; 736aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 7378f2b6f49SKaiGai Kohei } 738c9f700f8SKaiGai Kohei 739c9f700f8SKaiGai Kohei for (ref=c->xref_dead_list; ref; ref = _ref) { 740c9f700f8SKaiGai Kohei _ref = ref->next; 741c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 742c9f700f8SKaiGai Kohei } 743aa98d7cfSKaiGai Kohei 744aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 745aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 746aa98d7cfSKaiGai Kohei list_del(&xd->xindex); 747aa98d7cfSKaiGai Kohei if (xd->xname) 748aa98d7cfSKaiGai Kohei kfree(xd->xname); 749aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 750aa98d7cfSKaiGai Kohei } 751aa98d7cfSKaiGai Kohei } 752c9f700f8SKaiGai Kohei 753c9f700f8SKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 754c9f700f8SKaiGai Kohei list_del(&xd->xindex); 755c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 756c9f700f8SKaiGai Kohei } 7572ad8ee71SDavid Woodhouse list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 7582ad8ee71SDavid Woodhouse list_del(&xd->xindex); 7592ad8ee71SDavid Woodhouse jffs2_free_xattr_datum(xd); 7602ad8ee71SDavid Woodhouse } 761aa98d7cfSKaiGai Kohei } 762aa98d7cfSKaiGai Kohei 763c9f700f8SKaiGai Kohei #define XREF_TMPHASH_SIZE (128) 764aa98d7cfSKaiGai Kohei void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 765aa98d7cfSKaiGai Kohei { 766aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 767c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; 768aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 769aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic; 770c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 771aa98d7cfSKaiGai Kohei int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 7728a13695cSKaiGai Kohei int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 773aa98d7cfSKaiGai Kohei 774aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 775aa98d7cfSKaiGai Kohei 7768a13695cSKaiGai Kohei /* Phase.1 : Merge same xref */ 777c9f700f8SKaiGai Kohei for (i=0; i < XREF_TMPHASH_SIZE; i++) 778c9f700f8SKaiGai Kohei xref_tmphash[i] = NULL; 7798f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref=_ref) { 780c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp; 781c9f700f8SKaiGai Kohei 7828f2b6f49SKaiGai Kohei _ref = ref->next; 783aa98d7cfSKaiGai Kohei if (ref_flags(ref->node) != REF_PRISTINE) { 784aa98d7cfSKaiGai Kohei if (verify_xattr_ref(c, ref)) { 785c9f700f8SKaiGai Kohei BUG_ON(ref->node->next_in_ino != (void *)ref); 786c9f700f8SKaiGai Kohei ref->node->next_in_ino = NULL; 787c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, ref->node); 788aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 789aa98d7cfSKaiGai Kohei continue; 790aa98d7cfSKaiGai Kohei } 791aa98d7cfSKaiGai Kohei } 792c9f700f8SKaiGai Kohei 793c9f700f8SKaiGai Kohei i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 794c9f700f8SKaiGai Kohei for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 795c9f700f8SKaiGai Kohei if (tmp->ino == ref->ino && tmp->xid == ref->xid) 796c9f700f8SKaiGai Kohei break; 797c9f700f8SKaiGai Kohei } 798c9f700f8SKaiGai Kohei if (tmp) { 799c9f700f8SKaiGai Kohei raw = ref->node; 800c9f700f8SKaiGai Kohei if (ref->xseqno > tmp->xseqno) { 801c9f700f8SKaiGai Kohei tmp->xseqno = ref->xseqno; 802c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node; 803c9f700f8SKaiGai Kohei tmp->node = raw; 804c9f700f8SKaiGai Kohei } else { 805c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node->next_in_ino; 806c9f700f8SKaiGai Kohei tmp->node->next_in_ino = raw; 807c9f700f8SKaiGai Kohei } 808c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 809c9f700f8SKaiGai Kohei continue; 810c9f700f8SKaiGai Kohei } else { 811c9f700f8SKaiGai Kohei ref->next = xref_tmphash[i]; 812c9f700f8SKaiGai Kohei xref_tmphash[i] = ref; 813c9f700f8SKaiGai Kohei } 814c9f700f8SKaiGai Kohei } 815c9f700f8SKaiGai Kohei c->xref_temp = NULL; 816c9f700f8SKaiGai Kohei 8178a13695cSKaiGai Kohei /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 818c9f700f8SKaiGai Kohei for (i=0; i < XREF_TMPHASH_SIZE; i++) { 819c9f700f8SKaiGai Kohei for (ref=xref_tmphash[i]; ref; ref=_ref) { 8208a13695cSKaiGai Kohei xref_count++; 821c9f700f8SKaiGai Kohei _ref = ref->next; 822c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 823c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 824c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8258a13695cSKaiGai Kohei xref_dead_count++; 826c9f700f8SKaiGai Kohei continue; 827c9f700f8SKaiGai Kohei } 828aa98d7cfSKaiGai Kohei /* At this point, ref->xid and ref->ino contain XID and inode number. 829aa98d7cfSKaiGai Kohei ref->xd and ref->ic are not valid yet. */ 830aa98d7cfSKaiGai Kohei xd = jffs2_find_xattr_datum(c, ref->xid); 831aa98d7cfSKaiGai Kohei ic = jffs2_get_ino_cache(c, ref->ino); 83227c72b04SDavid Woodhouse if (!xd || !ic || !ic->pino_nlink) { 8338a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 834c9f700f8SKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 8358a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 836c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 837c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8388a13695cSKaiGai Kohei xref_orphan_count++; 839aa98d7cfSKaiGai Kohei continue; 840aa98d7cfSKaiGai Kohei } 841aa98d7cfSKaiGai Kohei ref->xd = xd; 842aa98d7cfSKaiGai Kohei ref->ic = ic; 8432c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 8448f2b6f49SKaiGai Kohei ref->next = ic->xref; 8458f2b6f49SKaiGai Kohei ic->xref = ref; 846aa98d7cfSKaiGai Kohei } 847c9f700f8SKaiGai Kohei } 848aa98d7cfSKaiGai Kohei 8498a13695cSKaiGai Kohei /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 850aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 851aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 8528a13695cSKaiGai Kohei xdatum_count++; 853aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 8542c887e23SKaiGai Kohei if (!atomic_read(&xd->refcnt)) { 8558a13695cSKaiGai Kohei dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 856c9f700f8SKaiGai Kohei xd->xid, xd->version); 8578a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 858c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 8598a13695cSKaiGai Kohei xdatum_orphan_count++; 860aa98d7cfSKaiGai Kohei continue; 861aa98d7cfSKaiGai Kohei } 862c9f700f8SKaiGai Kohei if (is_xattr_datum_unchecked(c, xd)) { 863c9f700f8SKaiGai Kohei dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 864c9f700f8SKaiGai Kohei xd->xid, xd->version); 865aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 866aa98d7cfSKaiGai Kohei xdatum_unchecked_count++; 867aa98d7cfSKaiGai Kohei } 868aa98d7cfSKaiGai Kohei } 869aa98d7cfSKaiGai Kohei } 870aa98d7cfSKaiGai Kohei /* build complete */ 8718a13695cSKaiGai Kohei JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 8728a13695cSKaiGai Kohei " (%u unchecked, %u orphan) and " 8738a13695cSKaiGai Kohei "%u of xref (%u dead, %u orphan) found.\n", 8748a13695cSKaiGai Kohei xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 8758a13695cSKaiGai Kohei xref_count, xref_dead_count, xref_orphan_count); 876aa98d7cfSKaiGai Kohei } 877aa98d7cfSKaiGai Kohei 878aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 879aa98d7cfSKaiGai Kohei uint32_t xid, uint32_t version) 880aa98d7cfSKaiGai Kohei { 881c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 882aa98d7cfSKaiGai Kohei 883c9f700f8SKaiGai Kohei xd = jffs2_find_xattr_datum(c, xid); 884c9f700f8SKaiGai Kohei if (!xd) { 885aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 886aa98d7cfSKaiGai Kohei if (!xd) 887aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 888aa98d7cfSKaiGai Kohei xd->xid = xid; 889aa98d7cfSKaiGai Kohei xd->version = version; 890aa98d7cfSKaiGai Kohei if (xd->xid > c->highest_xid) 891aa98d7cfSKaiGai Kohei c->highest_xid = xd->xid; 892aa98d7cfSKaiGai Kohei list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 893aa98d7cfSKaiGai Kohei } 894aa98d7cfSKaiGai Kohei return xd; 895aa98d7cfSKaiGai Kohei } 896aa98d7cfSKaiGai Kohei 897aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 898aa98d7cfSKaiGai Kohei * xprefix_to_handler(xprefix) 899aa98d7cfSKaiGai Kohei * is used to translate xprefix into xattr_handler. 900aa98d7cfSKaiGai Kohei * jffs2_listxattr(dentry, buffer, size) 901aa98d7cfSKaiGai Kohei * is an implementation of listxattr handler on jffs2. 902aa98d7cfSKaiGai Kohei * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 903aa98d7cfSKaiGai Kohei * is an implementation of getxattr handler on jffs2. 904aa98d7cfSKaiGai Kohei * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 905aa98d7cfSKaiGai Kohei * is an implementation of setxattr handler on jffs2. 906aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 907*365f0cb9SStephen Hemminger const struct xattr_handler *jffs2_xattr_handlers[] = { 908aa98d7cfSKaiGai Kohei &jffs2_user_xattr_handler, 909aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 910aa98d7cfSKaiGai Kohei &jffs2_security_xattr_handler, 911aa98d7cfSKaiGai Kohei #endif 912aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 913aa98d7cfSKaiGai Kohei &jffs2_acl_access_xattr_handler, 914aa98d7cfSKaiGai Kohei &jffs2_acl_default_xattr_handler, 915aa98d7cfSKaiGai Kohei #endif 916aa98d7cfSKaiGai Kohei &jffs2_trusted_xattr_handler, 917aa98d7cfSKaiGai Kohei NULL 918aa98d7cfSKaiGai Kohei }; 919aa98d7cfSKaiGai Kohei 920*365f0cb9SStephen Hemminger static const struct xattr_handler *xprefix_to_handler(int xprefix) { 921*365f0cb9SStephen Hemminger const struct xattr_handler *ret; 922aa98d7cfSKaiGai Kohei 923aa98d7cfSKaiGai Kohei switch (xprefix) { 924aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_USER: 925aa98d7cfSKaiGai Kohei ret = &jffs2_user_xattr_handler; 926aa98d7cfSKaiGai Kohei break; 927aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 928aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_SECURITY: 929aa98d7cfSKaiGai Kohei ret = &jffs2_security_xattr_handler; 930aa98d7cfSKaiGai Kohei break; 931aa98d7cfSKaiGai Kohei #endif 932aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 933aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_ACCESS: 934aa98d7cfSKaiGai Kohei ret = &jffs2_acl_access_xattr_handler; 935aa98d7cfSKaiGai Kohei break; 936aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_DEFAULT: 937aa98d7cfSKaiGai Kohei ret = &jffs2_acl_default_xattr_handler; 938aa98d7cfSKaiGai Kohei break; 939aa98d7cfSKaiGai Kohei #endif 940aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_TRUSTED: 941aa98d7cfSKaiGai Kohei ret = &jffs2_trusted_xattr_handler; 942aa98d7cfSKaiGai Kohei break; 943aa98d7cfSKaiGai Kohei default: 944aa98d7cfSKaiGai Kohei ret = NULL; 945aa98d7cfSKaiGai Kohei break; 946aa98d7cfSKaiGai Kohei } 947aa98d7cfSKaiGai Kohei return ret; 948aa98d7cfSKaiGai Kohei } 949aa98d7cfSKaiGai Kohei 950aa98d7cfSKaiGai Kohei ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 951aa98d7cfSKaiGai Kohei { 952aa98d7cfSKaiGai Kohei struct inode *inode = dentry->d_inode; 953aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 954aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 955aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 9568f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 957aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 958*365f0cb9SStephen Hemminger const struct xattr_handler *xhandle; 959aa98d7cfSKaiGai Kohei ssize_t len, rc; 960aa98d7cfSKaiGai Kohei int retry = 0; 961aa98d7cfSKaiGai Kohei 9628f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 963aa98d7cfSKaiGai Kohei if (unlikely(rc)) 964aa98d7cfSKaiGai Kohei return rc; 965aa98d7cfSKaiGai Kohei 966aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 967aa98d7cfSKaiGai Kohei retry: 968aa98d7cfSKaiGai Kohei len = 0; 9698f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 970aa98d7cfSKaiGai Kohei BUG_ON(ref->ic != ic); 971aa98d7cfSKaiGai Kohei xd = ref->xd; 972aa98d7cfSKaiGai Kohei if (!xd->xname) { 973aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 974aa98d7cfSKaiGai Kohei if (!retry) { 975aa98d7cfSKaiGai Kohei retry = 1; 976aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 977aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 978aa98d7cfSKaiGai Kohei goto retry; 979aa98d7cfSKaiGai Kohei } else { 980aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 981aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 9828f2b6f49SKaiGai Kohei *pref = ref->next; 9838a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 984aa98d7cfSKaiGai Kohei goto retry; 985aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 986aa98d7cfSKaiGai Kohei goto out; 987aa98d7cfSKaiGai Kohei } 988aa98d7cfSKaiGai Kohei } 989aa98d7cfSKaiGai Kohei xhandle = xprefix_to_handler(xd->xprefix); 990aa98d7cfSKaiGai Kohei if (!xhandle) 991aa98d7cfSKaiGai Kohei continue; 992aa98d7cfSKaiGai Kohei if (buffer) { 993431547b3SChristoph Hellwig rc = xhandle->list(dentry, buffer+len, size-len, 994431547b3SChristoph Hellwig xd->xname, xd->name_len, xd->flags); 995aa98d7cfSKaiGai Kohei } else { 996431547b3SChristoph Hellwig rc = xhandle->list(dentry, NULL, 0, xd->xname, 997431547b3SChristoph Hellwig xd->name_len, xd->flags); 998aa98d7cfSKaiGai Kohei } 999aa98d7cfSKaiGai Kohei if (rc < 0) 1000aa98d7cfSKaiGai Kohei goto out; 1001aa98d7cfSKaiGai Kohei len += rc; 1002aa98d7cfSKaiGai Kohei } 1003aa98d7cfSKaiGai Kohei rc = len; 1004aa98d7cfSKaiGai Kohei out: 1005aa98d7cfSKaiGai Kohei if (!retry) { 1006aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1007aa98d7cfSKaiGai Kohei } else { 1008aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1009aa98d7cfSKaiGai Kohei } 1010aa98d7cfSKaiGai Kohei return rc; 1011aa98d7cfSKaiGai Kohei } 1012aa98d7cfSKaiGai Kohei 1013aa98d7cfSKaiGai Kohei int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1014aa98d7cfSKaiGai Kohei char *buffer, size_t size) 1015aa98d7cfSKaiGai Kohei { 1016aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1017aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1018aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1019aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 10208f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 1021aa98d7cfSKaiGai Kohei int rc, retry = 0; 1022aa98d7cfSKaiGai Kohei 10238f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1024aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1025aa98d7cfSKaiGai Kohei return rc; 1026aa98d7cfSKaiGai Kohei 1027aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 1028aa98d7cfSKaiGai Kohei retry: 10298f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1030aa98d7cfSKaiGai Kohei BUG_ON(ref->ic!=ic); 1031aa98d7cfSKaiGai Kohei 1032aa98d7cfSKaiGai Kohei xd = ref->xd; 1033aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1034aa98d7cfSKaiGai Kohei continue; 1035aa98d7cfSKaiGai Kohei if (!xd->xname) { 1036aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 1037aa98d7cfSKaiGai Kohei if (!retry) { 1038aa98d7cfSKaiGai Kohei retry = 1; 1039aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1040aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1041aa98d7cfSKaiGai Kohei goto retry; 1042aa98d7cfSKaiGai Kohei } else { 1043aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1044aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 10458f2b6f49SKaiGai Kohei *pref = ref->next; 10468a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1047aa98d7cfSKaiGai Kohei goto retry; 1048aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) { 1049aa98d7cfSKaiGai Kohei goto out; 1050aa98d7cfSKaiGai Kohei } 1051aa98d7cfSKaiGai Kohei } 1052aa98d7cfSKaiGai Kohei } 1053aa98d7cfSKaiGai Kohei if (!strcmp(xname, xd->xname)) { 1054aa98d7cfSKaiGai Kohei rc = xd->value_len; 1055aa98d7cfSKaiGai Kohei if (buffer) { 1056aa98d7cfSKaiGai Kohei if (size < rc) { 1057aa98d7cfSKaiGai Kohei rc = -ERANGE; 1058aa98d7cfSKaiGai Kohei } else { 1059aa98d7cfSKaiGai Kohei memcpy(buffer, xd->xvalue, rc); 1060aa98d7cfSKaiGai Kohei } 1061aa98d7cfSKaiGai Kohei } 1062aa98d7cfSKaiGai Kohei goto out; 1063aa98d7cfSKaiGai Kohei } 1064aa98d7cfSKaiGai Kohei } 1065aa98d7cfSKaiGai Kohei rc = -ENODATA; 1066aa98d7cfSKaiGai Kohei out: 1067aa98d7cfSKaiGai Kohei if (!retry) { 1068aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1069aa98d7cfSKaiGai Kohei } else { 1070aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1071aa98d7cfSKaiGai Kohei } 1072aa98d7cfSKaiGai Kohei return rc; 1073aa98d7cfSKaiGai Kohei } 1074aa98d7cfSKaiGai Kohei 1075aa98d7cfSKaiGai Kohei int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1076aa98d7cfSKaiGai Kohei const char *buffer, size_t size, int flags) 1077aa98d7cfSKaiGai Kohei { 1078aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1079aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1080aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1081aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 10828f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, *newref, **pref; 10839fe4854cSDavid Woodhouse uint32_t length, request; 1084aa98d7cfSKaiGai Kohei int rc; 1085aa98d7cfSKaiGai Kohei 10868f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1087aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1088aa98d7cfSKaiGai Kohei return rc; 1089aa98d7cfSKaiGai Kohei 1090aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 10919fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1092aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1093aa98d7cfSKaiGai Kohei if (rc) { 1094aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1095aa98d7cfSKaiGai Kohei return rc; 1096aa98d7cfSKaiGai Kohei } 1097aa98d7cfSKaiGai Kohei 1098aa98d7cfSKaiGai Kohei /* Find existing xattr */ 1099aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1100aa98d7cfSKaiGai Kohei retry: 11018f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1102aa98d7cfSKaiGai Kohei xd = ref->xd; 1103aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1104aa98d7cfSKaiGai Kohei continue; 1105aa98d7cfSKaiGai Kohei if (!xd->xname) { 1106aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1107aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 11088f2b6f49SKaiGai Kohei *pref = ref->next; 11098a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1110aa98d7cfSKaiGai Kohei goto retry; 1111aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 1112aa98d7cfSKaiGai Kohei goto out; 1113aa98d7cfSKaiGai Kohei } 1114aa98d7cfSKaiGai Kohei if (!strcmp(xd->xname, xname)) { 1115aa98d7cfSKaiGai Kohei if (flags & XATTR_CREATE) { 1116aa98d7cfSKaiGai Kohei rc = -EEXIST; 1117aa98d7cfSKaiGai Kohei goto out; 1118aa98d7cfSKaiGai Kohei } 1119aa98d7cfSKaiGai Kohei if (!buffer) { 11208a13695cSKaiGai Kohei ref->ino = ic->ino; 11218a13695cSKaiGai Kohei ref->xid = xd->xid; 11228a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 11238a13695cSKaiGai Kohei rc = save_xattr_ref(c, ref); 11248a13695cSKaiGai Kohei if (!rc) { 11258f2b6f49SKaiGai Kohei *pref = ref->next; 11268a13695cSKaiGai Kohei spin_lock(&c->erase_completion_lock); 11278a13695cSKaiGai Kohei ref->next = c->xref_dead_list; 11288a13695cSKaiGai Kohei c->xref_dead_list = ref; 11298a13695cSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1130c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 11318a13695cSKaiGai Kohei } else { 11328a13695cSKaiGai Kohei ref->ic = ic; 11338a13695cSKaiGai Kohei ref->xd = xd; 11348a13695cSKaiGai Kohei ref->xseqno &= ~XREF_DELETE_MARKER; 11358a13695cSKaiGai Kohei } 1136aa98d7cfSKaiGai Kohei goto out; 1137aa98d7cfSKaiGai Kohei } 1138aa98d7cfSKaiGai Kohei goto found; 1139aa98d7cfSKaiGai Kohei } 1140aa98d7cfSKaiGai Kohei } 1141aa98d7cfSKaiGai Kohei /* not found */ 1142aa98d7cfSKaiGai Kohei if (flags & XATTR_REPLACE) { 1143aa98d7cfSKaiGai Kohei rc = -ENODATA; 1144aa98d7cfSKaiGai Kohei goto out; 1145aa98d7cfSKaiGai Kohei } 1146aa98d7cfSKaiGai Kohei if (!buffer) { 1147c9f700f8SKaiGai Kohei rc = -ENODATA; 1148aa98d7cfSKaiGai Kohei goto out; 1149aa98d7cfSKaiGai Kohei } 1150aa98d7cfSKaiGai Kohei found: 11519fe4854cSDavid Woodhouse xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1152aa98d7cfSKaiGai Kohei if (IS_ERR(xd)) { 1153aa98d7cfSKaiGai Kohei rc = PTR_ERR(xd); 1154aa98d7cfSKaiGai Kohei goto out; 1155aa98d7cfSKaiGai Kohei } 1156aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1157aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1158aa98d7cfSKaiGai Kohei 1159aa98d7cfSKaiGai Kohei /* create xattr_ref */ 1160aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xref)); 11619fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1162aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1163c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 1164aa98d7cfSKaiGai Kohei if (rc) { 1165aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1166c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 1167aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1168aa98d7cfSKaiGai Kohei return rc; 1169aa98d7cfSKaiGai Kohei } 11708f2b6f49SKaiGai Kohei if (ref) 11718f2b6f49SKaiGai Kohei *pref = ref->next; 11729fe4854cSDavid Woodhouse newref = create_xattr_ref(c, ic, xd); 1173aa98d7cfSKaiGai Kohei if (IS_ERR(newref)) { 11748f2b6f49SKaiGai Kohei if (ref) { 11758f2b6f49SKaiGai Kohei ref->next = ic->xref; 11768f2b6f49SKaiGai Kohei ic->xref = ref; 11778f2b6f49SKaiGai Kohei } 1178aa98d7cfSKaiGai Kohei rc = PTR_ERR(newref); 1179c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 1180aa98d7cfSKaiGai Kohei } else if (ref) { 11818a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1182aa98d7cfSKaiGai Kohei } 1183aa98d7cfSKaiGai Kohei out: 1184aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1185aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1186aa98d7cfSKaiGai Kohei return rc; 1187aa98d7cfSKaiGai Kohei } 1188aa98d7cfSKaiGai Kohei 1189aa98d7cfSKaiGai Kohei /* -------- garbage collector functions ------------- 1190c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1191aa98d7cfSKaiGai Kohei * is used to move xdatum into new node. 1192c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1193aa98d7cfSKaiGai Kohei * is used to move xref into new node. 1194aa98d7cfSKaiGai Kohei * jffs2_verify_xattr(c) 1195aa98d7cfSKaiGai Kohei * is used to call do_verify_xattr_datum() before garbage collecting. 11968a13695cSKaiGai Kohei * jffs2_release_xattr_datum(c, xd) 11978a13695cSKaiGai Kohei * is used to release an in-memory object of xdatum. 11988a13695cSKaiGai Kohei * jffs2_release_xattr_ref(c, ref) 11998a13695cSKaiGai Kohei * is used to release an in-memory object of xref. 1200aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 1201c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1202c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1203aa98d7cfSKaiGai Kohei { 12049fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1205c9f700f8SKaiGai Kohei int rc = 0; 1206aa98d7cfSKaiGai Kohei 1207084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1208c9f700f8SKaiGai Kohei if (xd->node != raw) 1209c9f700f8SKaiGai Kohei goto out; 12108a13695cSKaiGai Kohei if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1211c9f700f8SKaiGai Kohei goto out; 1212aa98d7cfSKaiGai Kohei 1213aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 12148a13695cSKaiGai Kohei if (unlikely(rc)) { 12158a13695cSKaiGai Kohei rc = (rc > 0) ? 0 : rc; 1216084702e0SKaiGai Kohei goto out; 1217aa98d7cfSKaiGai Kohei } 12188a13695cSKaiGai Kohei old_ofs = ref_offset(xd->node); 12198a13695cSKaiGai Kohei totlen = PAD(sizeof(struct jffs2_raw_xattr) 12208a13695cSKaiGai Kohei + xd->name_len + 1 + xd->value_len); 12219fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1222c9f700f8SKaiGai Kohei if (rc) { 1223c9f700f8SKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1224084702e0SKaiGai Kohei goto out; 1225aa98d7cfSKaiGai Kohei } 12269fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 1227aa98d7cfSKaiGai Kohei if (!rc) 1228aa98d7cfSKaiGai Kohei dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1229aa98d7cfSKaiGai Kohei xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1230084702e0SKaiGai Kohei out: 1231c9f700f8SKaiGai Kohei if (!rc) 1232c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1233084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1234aa98d7cfSKaiGai Kohei return rc; 1235aa98d7cfSKaiGai Kohei } 1236aa98d7cfSKaiGai Kohei 1237c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1238c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1239aa98d7cfSKaiGai Kohei { 12409fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1241c9f700f8SKaiGai Kohei int rc = 0; 1242aa98d7cfSKaiGai Kohei 1243084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1244aa98d7cfSKaiGai Kohei BUG_ON(!ref->node); 1245aa98d7cfSKaiGai Kohei 1246c9f700f8SKaiGai Kohei if (ref->node != raw) 1247c9f700f8SKaiGai Kohei goto out; 1248c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1249084702e0SKaiGai Kohei goto out; 1250084702e0SKaiGai Kohei 1251c9f700f8SKaiGai Kohei old_ofs = ref_offset(ref->node); 1252c9f700f8SKaiGai Kohei totlen = ref_totlen(c, c->gcblock, ref->node); 1253c9f700f8SKaiGai Kohei 12549fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1255c9f700f8SKaiGai Kohei if (rc) { 1256c9f700f8SKaiGai Kohei JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 12578e24eea7SHarvey Harrison __func__, rc, totlen); 1258084702e0SKaiGai Kohei rc = rc ? rc : -EBADFD; 1259084702e0SKaiGai Kohei goto out; 1260aa98d7cfSKaiGai Kohei } 12619fe4854cSDavid Woodhouse rc = save_xattr_ref(c, ref); 1262aa98d7cfSKaiGai Kohei if (!rc) 1263aa98d7cfSKaiGai Kohei dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1264aa98d7cfSKaiGai Kohei ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1265084702e0SKaiGai Kohei out: 1266c9f700f8SKaiGai Kohei if (!rc) 1267c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1268084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1269aa98d7cfSKaiGai Kohei return rc; 1270aa98d7cfSKaiGai Kohei } 1271aa98d7cfSKaiGai Kohei 1272aa98d7cfSKaiGai Kohei int jffs2_verify_xattr(struct jffs2_sb_info *c) 1273aa98d7cfSKaiGai Kohei { 1274aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 1275c9f700f8SKaiGai Kohei struct jffs2_eraseblock *jeb; 1276c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 1277c9f700f8SKaiGai Kohei uint32_t totlen; 1278aa98d7cfSKaiGai Kohei int rc; 1279aa98d7cfSKaiGai Kohei 1280aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1281aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1282aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 1283c9f700f8SKaiGai Kohei if (rc < 0) 1284c9f700f8SKaiGai Kohei continue; 1285aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 1286c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 1287c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1288c9f700f8SKaiGai Kohei if (ref_flags(raw) != REF_UNCHECKED) 1289c9f700f8SKaiGai Kohei continue; 1290c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1291c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 1292c9f700f8SKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 1293c9f700f8SKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1294c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) 1295c9f700f8SKaiGai Kohei | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1296aa98d7cfSKaiGai Kohei } 12978a13695cSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_DEAD) 1298c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_dead_list); 1299c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1300aa98d7cfSKaiGai Kohei } 1301aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1302aa98d7cfSKaiGai Kohei return list_empty(&c->xattr_unchecked) ? 1 : 0; 1303aa98d7cfSKaiGai Kohei } 1304c9f700f8SKaiGai Kohei 1305c9f700f8SKaiGai Kohei void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1306c9f700f8SKaiGai Kohei { 1307c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 13082c887e23SKaiGai Kohei if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1309c9f700f8SKaiGai Kohei return; 1310c9f700f8SKaiGai Kohei 1311c9f700f8SKaiGai Kohei list_del(&xd->xindex); 1312c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 1313c9f700f8SKaiGai Kohei } 1314c9f700f8SKaiGai Kohei 1315c9f700f8SKaiGai Kohei void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1316c9f700f8SKaiGai Kohei { 1317c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 1318c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp, **ptmp; 1319c9f700f8SKaiGai Kohei 1320c9f700f8SKaiGai Kohei if (ref->node != (void *)ref) 1321c9f700f8SKaiGai Kohei return; 1322c9f700f8SKaiGai Kohei 1323c9f700f8SKaiGai Kohei for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1324c9f700f8SKaiGai Kohei if (ref == tmp) { 1325c9f700f8SKaiGai Kohei *ptmp = tmp->next; 1326c9f700f8SKaiGai Kohei break; 1327c9f700f8SKaiGai Kohei } 1328c9f700f8SKaiGai Kohei } 13298a13695cSKaiGai Kohei jffs2_free_xattr_ref(ref); 1330c9f700f8SKaiGai Kohei } 1331