1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4aa98d7cfSKaiGai Kohei * Copyright (C) 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 */ 11aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 12aa98d7cfSKaiGai Kohei #include <linux/slab.h> 13aa98d7cfSKaiGai Kohei #include <linux/fs.h> 14aa98d7cfSKaiGai Kohei #include <linux/time.h> 15aa98d7cfSKaiGai Kohei #include <linux/pagemap.h> 16aa98d7cfSKaiGai Kohei #include <linux/highmem.h> 17aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 18aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 19aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 20aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 21aa98d7cfSKaiGai Kohei #include "nodelist.h" 22aa98d7cfSKaiGai Kohei /* -------- xdatum related functions ---------------- 23aa98d7cfSKaiGai Kohei * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 24aa98d7cfSKaiGai Kohei * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 25aa98d7cfSKaiGai Kohei * the index of the xattr name/value pair cache (c->xattrindex). 26c9f700f8SKaiGai Kohei * is_xattr_datum_unchecked(c, xd) 27c9f700f8SKaiGai Kohei * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 28c9f700f8SKaiGai Kohei * unchecked, it returns 0. 29aa98d7cfSKaiGai Kohei * unload_xattr_datum(c, xd) 30aa98d7cfSKaiGai Kohei * is used to release xattr name/value pair and detach from c->xattrindex. 31aa98d7cfSKaiGai Kohei * reclaim_xattr_datum(c) 32aa98d7cfSKaiGai Kohei * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 33aa98d7cfSKaiGai Kohei * memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold 34aa98d7cfSKaiGai Kohei * is hard coded as 32KiB. 35aa98d7cfSKaiGai Kohei * do_verify_xattr_datum(c, xd) 36aa98d7cfSKaiGai Kohei * is used to load the xdatum informations without name/value pair from the medium. 37aa98d7cfSKaiGai Kohei * It's necessary once, because those informations are not collected during mounting 38aa98d7cfSKaiGai Kohei * process when EBS is enabled. 39aa98d7cfSKaiGai Kohei * 0 will be returned, if success. An negative return value means recoverable error, and 40aa98d7cfSKaiGai Kohei * positive return value means unrecoverable error. Thus, caller must remove this xdatum 41aa98d7cfSKaiGai Kohei * and xref when it returned positive value. 42aa98d7cfSKaiGai Kohei * do_load_xattr_datum(c, xd) 43aa98d7cfSKaiGai Kohei * is used to load name/value pair from the medium. 44aa98d7cfSKaiGai Kohei * The meanings of return value is same as do_verify_xattr_datum(). 45aa98d7cfSKaiGai Kohei * load_xattr_datum(c, xd) 46aa98d7cfSKaiGai Kohei * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 47aa98d7cfSKaiGai Kohei * If xd need to call do_verify_xattr_datum() at first, it's called before calling 48aa98d7cfSKaiGai Kohei * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 499fe4854cSDavid Woodhouse * save_xattr_datum(c, xd) 50aa98d7cfSKaiGai Kohei * is used to write xdatum to medium. xd->version will be incremented. 519fe4854cSDavid Woodhouse * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 52aa98d7cfSKaiGai Kohei * is used to create new xdatum and write to medium. 53c9f700f8SKaiGai Kohei * delete_xattr_datum(c, xd) 548a13695cSKaiGai Kohei * is used to delete a xdatum. It marks xd JFFS2_XFLAGS_DEAD, and allows 558a13695cSKaiGai Kohei * GC to reclaim those physical nodes. 56aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 57aa98d7cfSKaiGai Kohei static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 58aa98d7cfSKaiGai Kohei { 59aa98d7cfSKaiGai Kohei int name_len = strlen(xname); 60aa98d7cfSKaiGai Kohei 61aa98d7cfSKaiGai Kohei return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 62aa98d7cfSKaiGai Kohei } 63aa98d7cfSKaiGai Kohei 64c9f700f8SKaiGai Kohei static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 65c9f700f8SKaiGai Kohei { 66c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 67c9f700f8SKaiGai Kohei int rc = 0; 68c9f700f8SKaiGai Kohei 69c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 70c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 71c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 72c9f700f8SKaiGai Kohei rc = 1; 73c9f700f8SKaiGai Kohei break; 74c9f700f8SKaiGai Kohei } 75c9f700f8SKaiGai Kohei } 76c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 77c9f700f8SKaiGai Kohei return rc; 78c9f700f8SKaiGai Kohei } 79c9f700f8SKaiGai Kohei 80aa98d7cfSKaiGai Kohei static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 81aa98d7cfSKaiGai Kohei { 82aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 83aa98d7cfSKaiGai Kohei D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version)); 84aa98d7cfSKaiGai Kohei if (xd->xname) { 85aa98d7cfSKaiGai Kohei c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 86aa98d7cfSKaiGai Kohei kfree(xd->xname); 87aa98d7cfSKaiGai Kohei } 88aa98d7cfSKaiGai Kohei 89aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 90aa98d7cfSKaiGai Kohei xd->hashkey = 0; 91aa98d7cfSKaiGai Kohei xd->xname = NULL; 92aa98d7cfSKaiGai Kohei xd->xvalue = NULL; 93aa98d7cfSKaiGai Kohei } 94aa98d7cfSKaiGai Kohei 95aa98d7cfSKaiGai Kohei static void reclaim_xattr_datum(struct jffs2_sb_info *c) 96aa98d7cfSKaiGai Kohei { 97aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 98aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 99aa98d7cfSKaiGai Kohei uint32_t target, before; 100aa98d7cfSKaiGai Kohei static int index = 0; 101aa98d7cfSKaiGai Kohei int count; 102aa98d7cfSKaiGai Kohei 103aa98d7cfSKaiGai Kohei if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 104aa98d7cfSKaiGai Kohei return; 105aa98d7cfSKaiGai Kohei 106aa98d7cfSKaiGai Kohei before = c->xdatum_mem_usage; 107aa98d7cfSKaiGai Kohei target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 108aa98d7cfSKaiGai Kohei for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 109aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 110aa98d7cfSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_HOT) { 111aa98d7cfSKaiGai Kohei xd->flags &= ~JFFS2_XFLAGS_HOT; 112aa98d7cfSKaiGai Kohei } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 113aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 114aa98d7cfSKaiGai Kohei } 115aa98d7cfSKaiGai Kohei if (c->xdatum_mem_usage <= target) 116aa98d7cfSKaiGai Kohei goto out; 117aa98d7cfSKaiGai Kohei } 118aa98d7cfSKaiGai Kohei index = (index+1) % XATTRINDEX_HASHSIZE; 119aa98d7cfSKaiGai Kohei } 120aa98d7cfSKaiGai Kohei out: 121aa98d7cfSKaiGai Kohei JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 122aa98d7cfSKaiGai Kohei before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 123aa98d7cfSKaiGai Kohei } 124aa98d7cfSKaiGai Kohei 125aa98d7cfSKaiGai Kohei static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 126aa98d7cfSKaiGai Kohei { 127aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 128aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 129c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 130aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr rx; 131aa98d7cfSKaiGai Kohei size_t readlen; 132c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 133aa98d7cfSKaiGai Kohei int rc; 134aa98d7cfSKaiGai Kohei 135c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 136c9f700f8SKaiGai Kohei offset = ref_offset(xd->node); 137c9f700f8SKaiGai Kohei if (ref_flags(xd->node) == REF_PRISTINE) 138c9f700f8SKaiGai Kohei goto complete; 139c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 140aa98d7cfSKaiGai Kohei 141c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 142aa98d7cfSKaiGai Kohei if (rc || readlen != sizeof(rx)) { 14389291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 144c9f700f8SKaiGai Kohei rc, sizeof(rx), readlen, offset); 145aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 146aa98d7cfSKaiGai Kohei } 147aa98d7cfSKaiGai Kohei crc = crc32(0, &rx, sizeof(rx) - 4); 148aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx.node_crc)) { 149aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 150c9f700f8SKaiGai Kohei offset, je32_to_cpu(rx.hdr_crc), crc); 151c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 152aa98d7cfSKaiGai Kohei return EIO; 153aa98d7cfSKaiGai Kohei } 1548a13695cSKaiGai Kohei totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 155aa98d7cfSKaiGai Kohei if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 156aa98d7cfSKaiGai Kohei || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 157aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.totlen) != totlen 158aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.xid) != xd->xid 159aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.version) != xd->version) { 160aa98d7cfSKaiGai Kohei JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 161aa98d7cfSKaiGai Kohei "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 162c9f700f8SKaiGai Kohei offset, 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); 167c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 168aa98d7cfSKaiGai Kohei return EIO; 169aa98d7cfSKaiGai Kohei } 170aa98d7cfSKaiGai Kohei xd->xprefix = rx.xprefix; 171aa98d7cfSKaiGai Kohei xd->name_len = rx.name_len; 172aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx.value_len); 173aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx.data_crc); 174aa98d7cfSKaiGai Kohei 175aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 176c9f700f8SKaiGai Kohei complete: 177c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 178c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 179c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 180c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 181aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 182aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 183c9f700f8SKaiGai Kohei } 184c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 185c9f700f8SKaiGai Kohei } 186aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 187aa98d7cfSKaiGai Kohei 188aa98d7cfSKaiGai Kohei /* unchecked xdatum is chained with c->xattr_unchecked */ 189aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 190aa98d7cfSKaiGai Kohei 191aa98d7cfSKaiGai Kohei dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", 192aa98d7cfSKaiGai Kohei xd->xid, xd->version); 193aa98d7cfSKaiGai Kohei 194aa98d7cfSKaiGai Kohei return 0; 195aa98d7cfSKaiGai Kohei } 196aa98d7cfSKaiGai Kohei 197aa98d7cfSKaiGai Kohei static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 198aa98d7cfSKaiGai Kohei { 199aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 200aa98d7cfSKaiGai Kohei char *data; 201aa98d7cfSKaiGai Kohei size_t readlen; 202aa98d7cfSKaiGai Kohei uint32_t crc, length; 203aa98d7cfSKaiGai Kohei int i, ret, retry = 0; 204aa98d7cfSKaiGai Kohei 205aa98d7cfSKaiGai Kohei BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 206aa98d7cfSKaiGai Kohei BUG_ON(!list_empty(&xd->xindex)); 207aa98d7cfSKaiGai Kohei retry: 208aa98d7cfSKaiGai Kohei length = xd->name_len + 1 + xd->value_len; 209aa98d7cfSKaiGai Kohei data = kmalloc(length, GFP_KERNEL); 210aa98d7cfSKaiGai Kohei if (!data) 211aa98d7cfSKaiGai Kohei return -ENOMEM; 212aa98d7cfSKaiGai Kohei 213aa98d7cfSKaiGai Kohei ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 214aa98d7cfSKaiGai Kohei length, &readlen, data); 215aa98d7cfSKaiGai Kohei 216aa98d7cfSKaiGai Kohei if (ret || length!=readlen) { 21789291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 218aa98d7cfSKaiGai Kohei ret, length, readlen, ref_offset(xd->node)); 219aa98d7cfSKaiGai Kohei kfree(data); 220aa98d7cfSKaiGai Kohei return ret ? ret : -EIO; 221aa98d7cfSKaiGai Kohei } 222aa98d7cfSKaiGai Kohei 223aa98d7cfSKaiGai Kohei data[xd->name_len] = '\0'; 224aa98d7cfSKaiGai Kohei crc = crc32(0, data, length); 225aa98d7cfSKaiGai Kohei if (crc != xd->data_crc) { 226aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" 227aa98d7cfSKaiGai Kohei " at %#08x, read: 0x%08x calculated: 0x%08x\n", 228aa98d7cfSKaiGai Kohei ref_offset(xd->node), xd->data_crc, crc); 229aa98d7cfSKaiGai Kohei kfree(data); 230c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 231aa98d7cfSKaiGai Kohei return EIO; 232aa98d7cfSKaiGai Kohei } 233aa98d7cfSKaiGai Kohei 234aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 235aa98d7cfSKaiGai Kohei xd->xname = data; 236aa98d7cfSKaiGai Kohei xd->xvalue = data + xd->name_len+1; 237aa98d7cfSKaiGai Kohei 238aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += length; 239aa98d7cfSKaiGai Kohei 240aa98d7cfSKaiGai Kohei xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 241aa98d7cfSKaiGai Kohei i = xd->hashkey % XATTRINDEX_HASHSIZE; 242aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 243aa98d7cfSKaiGai Kohei if (!retry) { 244aa98d7cfSKaiGai Kohei retry = 1; 245aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 246aa98d7cfSKaiGai Kohei if (!xd->xname) 247aa98d7cfSKaiGai Kohei goto retry; 248aa98d7cfSKaiGai Kohei } 249aa98d7cfSKaiGai Kohei 250aa98d7cfSKaiGai Kohei dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 251aa98d7cfSKaiGai Kohei xd->xid, xd->xprefix, xd->xname); 252aa98d7cfSKaiGai Kohei 253aa98d7cfSKaiGai Kohei return 0; 254aa98d7cfSKaiGai Kohei } 255aa98d7cfSKaiGai Kohei 256aa98d7cfSKaiGai Kohei static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 257aa98d7cfSKaiGai Kohei { 258aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem); 259aa98d7cfSKaiGai Kohei * rc < 0 : recoverable error, try again 260aa98d7cfSKaiGai Kohei * rc = 0 : success 261aa98d7cfSKaiGai Kohei * rc > 0 : Unrecoverable error, this node should be deleted. 262aa98d7cfSKaiGai Kohei */ 263aa98d7cfSKaiGai Kohei int rc = 0; 264c9f700f8SKaiGai Kohei 2658a13695cSKaiGai Kohei BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 266c9f700f8SKaiGai Kohei if (xd->xname) 267c9f700f8SKaiGai Kohei return 0; 268c9f700f8SKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_INVALID) 269aa98d7cfSKaiGai Kohei return EIO; 270c9f700f8SKaiGai Kohei if (unlikely(is_xattr_datum_unchecked(c, xd))) 271aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 272aa98d7cfSKaiGai Kohei if (!rc) 273aa98d7cfSKaiGai Kohei rc = do_load_xattr_datum(c, xd); 274aa98d7cfSKaiGai Kohei return rc; 275aa98d7cfSKaiGai Kohei } 276aa98d7cfSKaiGai Kohei 2779fe4854cSDavid Woodhouse static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 278aa98d7cfSKaiGai Kohei { 279aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 2802f785402SDavid Woodhouse struct jffs2_raw_xattr rx; 281aa98d7cfSKaiGai Kohei struct kvec vecs[2]; 28289291a9dSDavid Woodhouse size_t length; 2838a13695cSKaiGai Kohei int rc, totlen; 2849fe4854cSDavid Woodhouse uint32_t phys_ofs = write_ofs(c); 285aa98d7cfSKaiGai Kohei 2868a13695cSKaiGai Kohei BUG_ON(!xd->xname); 2878a13695cSKaiGai Kohei BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 288aa98d7cfSKaiGai Kohei 289aa98d7cfSKaiGai Kohei vecs[0].iov_base = ℞ 2908a13695cSKaiGai Kohei vecs[0].iov_len = sizeof(rx); 291aa98d7cfSKaiGai Kohei vecs[1].iov_base = xd->xname; 292aa98d7cfSKaiGai Kohei vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 2938a13695cSKaiGai Kohei totlen = vecs[0].iov_len + vecs[1].iov_len; 2948a13695cSKaiGai Kohei 295aa98d7cfSKaiGai Kohei /* Setup raw-xattr */ 296c9f700f8SKaiGai Kohei memset(&rx, 0, sizeof(rx)); 297aa98d7cfSKaiGai Kohei rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 298aa98d7cfSKaiGai Kohei rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 299aa98d7cfSKaiGai Kohei rx.totlen = cpu_to_je32(PAD(totlen)); 300aa98d7cfSKaiGai Kohei rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 301aa98d7cfSKaiGai Kohei 302aa98d7cfSKaiGai Kohei rx.xid = cpu_to_je32(xd->xid); 303aa98d7cfSKaiGai Kohei rx.version = cpu_to_je32(++xd->version); 304aa98d7cfSKaiGai Kohei rx.xprefix = xd->xprefix; 305aa98d7cfSKaiGai Kohei rx.name_len = xd->name_len; 306aa98d7cfSKaiGai Kohei rx.value_len = cpu_to_je16(xd->value_len); 307aa98d7cfSKaiGai Kohei rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 308aa98d7cfSKaiGai Kohei rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 309aa98d7cfSKaiGai Kohei 3108a13695cSKaiGai Kohei rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 311aa98d7cfSKaiGai Kohei if (rc || totlen != length) { 31289291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 313aa98d7cfSKaiGai Kohei rc, totlen, length, phys_ofs); 314aa98d7cfSKaiGai Kohei rc = rc ? rc : -EIO; 3152f785402SDavid Woodhouse if (length) 3162f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 3172f785402SDavid Woodhouse 318aa98d7cfSKaiGai Kohei return rc; 319aa98d7cfSKaiGai Kohei } 320aa98d7cfSKaiGai Kohei /* success */ 321c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 322aa98d7cfSKaiGai Kohei 323aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 324aa98d7cfSKaiGai Kohei xd->xid, xd->version, xd->xprefix, xd->xname); 325aa98d7cfSKaiGai Kohei 326aa98d7cfSKaiGai Kohei return 0; 327aa98d7cfSKaiGai Kohei } 328aa98d7cfSKaiGai Kohei 329aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 330aa98d7cfSKaiGai Kohei int xprefix, const char *xname, 3319fe4854cSDavid Woodhouse const char *xvalue, int xsize) 332aa98d7cfSKaiGai Kohei { 333aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 334aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 335aa98d7cfSKaiGai Kohei uint32_t hashkey, name_len; 336aa98d7cfSKaiGai Kohei char *data; 337aa98d7cfSKaiGai Kohei int i, rc; 338aa98d7cfSKaiGai Kohei 339aa98d7cfSKaiGai Kohei /* Search xattr_datum has same xname/xvalue by index */ 340aa98d7cfSKaiGai Kohei hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 341aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 342aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 343aa98d7cfSKaiGai Kohei if (xd->hashkey==hashkey 344aa98d7cfSKaiGai Kohei && xd->xprefix==xprefix 345aa98d7cfSKaiGai Kohei && xd->value_len==xsize 346aa98d7cfSKaiGai Kohei && !strcmp(xd->xname, xname) 347aa98d7cfSKaiGai Kohei && !memcmp(xd->xvalue, xvalue, xsize)) { 348*2c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 349aa98d7cfSKaiGai Kohei return xd; 350aa98d7cfSKaiGai Kohei } 351aa98d7cfSKaiGai Kohei } 352aa98d7cfSKaiGai Kohei 353aa98d7cfSKaiGai Kohei /* Not found, Create NEW XATTR-Cache */ 354aa98d7cfSKaiGai Kohei name_len = strlen(xname); 355aa98d7cfSKaiGai Kohei 356aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 357aa98d7cfSKaiGai Kohei if (!xd) 358aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 359aa98d7cfSKaiGai Kohei 360aa98d7cfSKaiGai Kohei data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 361aa98d7cfSKaiGai Kohei if (!data) { 362aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 363aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 364aa98d7cfSKaiGai Kohei } 365aa98d7cfSKaiGai Kohei strcpy(data, xname); 366aa98d7cfSKaiGai Kohei memcpy(data + name_len + 1, xvalue, xsize); 367aa98d7cfSKaiGai Kohei 368*2c887e23SKaiGai Kohei atomic_set(&xd->refcnt, 1); 369aa98d7cfSKaiGai Kohei xd->xid = ++c->highest_xid; 370aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 371aa98d7cfSKaiGai Kohei xd->xprefix = xprefix; 372aa98d7cfSKaiGai Kohei 373aa98d7cfSKaiGai Kohei xd->hashkey = hashkey; 374aa98d7cfSKaiGai Kohei xd->xname = data; 375aa98d7cfSKaiGai Kohei xd->xvalue = data + name_len + 1; 376aa98d7cfSKaiGai Kohei xd->name_len = name_len; 377aa98d7cfSKaiGai Kohei xd->value_len = xsize; 378aa98d7cfSKaiGai Kohei xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 379aa98d7cfSKaiGai Kohei 3809fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 381aa98d7cfSKaiGai Kohei if (rc) { 382aa98d7cfSKaiGai Kohei kfree(xd->xname); 383aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 384aa98d7cfSKaiGai Kohei return ERR_PTR(rc); 385aa98d7cfSKaiGai Kohei } 386aa98d7cfSKaiGai Kohei 387aa98d7cfSKaiGai Kohei /* Insert Hash Index */ 388aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 389aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 390aa98d7cfSKaiGai Kohei 391aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 392aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 393aa98d7cfSKaiGai Kohei 394aa98d7cfSKaiGai Kohei return xd; 395aa98d7cfSKaiGai Kohei } 396aa98d7cfSKaiGai Kohei 3978a13695cSKaiGai Kohei static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 398c9f700f8SKaiGai Kohei { 399c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 400*2c887e23SKaiGai Kohei BUG_ON(atomic_read(&xd->refcnt)); 401c9f700f8SKaiGai Kohei 402c9f700f8SKaiGai Kohei unload_xattr_datum(c, xd); 4038a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 404c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 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); 4128a13695cSKaiGai Kohei dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", xd->xid, xd->version); 413c9f700f8SKaiGai Kohei } 414c9f700f8SKaiGai Kohei 41521b9879bSKaiGai Kohei /* -------- xref related functions ------------------ 416aa98d7cfSKaiGai Kohei * verify_xattr_ref(c, ref) 417aa98d7cfSKaiGai Kohei * is used to load xref information from medium. Because summary data does not 418aa98d7cfSKaiGai Kohei * contain xid/ino, it's necessary to verify once while mounting process. 4199fe4854cSDavid Woodhouse * save_xattr_ref(c, ref) 4208a13695cSKaiGai Kohei * is used to write xref to medium. If delete marker is marked, it write 4218a13695cSKaiGai Kohei * a delete marker of xref into medium. 4229fe4854cSDavid Woodhouse * create_xattr_ref(c, ic, xd) 423aa98d7cfSKaiGai Kohei * is used to create a new xref and write to medium. 4248a13695cSKaiGai Kohei * delete_xattr_ref(c, ref) 4258a13695cSKaiGai Kohei * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 4268a13695cSKaiGai Kohei * and allows GC to reclaim those physical nodes. 427aa98d7cfSKaiGai Kohei * jffs2_xattr_delete_inode(c, ic) 428aa98d7cfSKaiGai Kohei * is called to remove xrefs related to obsolete inode when inode is unlinked. 429aa98d7cfSKaiGai Kohei * jffs2_xattr_free_inode(c, ic) 430aa98d7cfSKaiGai Kohei * is called to release xattr related objects when unmounting. 4318f2b6f49SKaiGai Kohei * check_xattr_ref_inode(c, ic) 432aa98d7cfSKaiGai Kohei * is used to confirm inode does not have duplicate xattr name/value pair. 433aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 434aa98d7cfSKaiGai Kohei static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 435aa98d7cfSKaiGai Kohei { 436aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 437c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 438aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 439aa98d7cfSKaiGai Kohei size_t readlen; 440c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 441aa98d7cfSKaiGai Kohei int rc; 442aa98d7cfSKaiGai Kohei 443c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 444c9f700f8SKaiGai Kohei if (ref_flags(ref->node) != REF_UNCHECKED) 445c9f700f8SKaiGai Kohei goto complete; 446c9f700f8SKaiGai Kohei offset = ref_offset(ref->node); 447c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 448aa98d7cfSKaiGai Kohei 449c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 450aa98d7cfSKaiGai Kohei if (rc || sizeof(rr) != readlen) { 45189291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 452c9f700f8SKaiGai Kohei rc, sizeof(rr), readlen, offset); 453aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 454aa98d7cfSKaiGai Kohei } 455aa98d7cfSKaiGai Kohei /* obsolete node */ 456aa98d7cfSKaiGai Kohei crc = crc32(0, &rr, sizeof(rr) - 4); 457aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr.node_crc)) { 458aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 459c9f700f8SKaiGai Kohei offset, je32_to_cpu(rr.node_crc), crc); 460aa98d7cfSKaiGai Kohei return EIO; 461aa98d7cfSKaiGai Kohei } 462aa98d7cfSKaiGai Kohei if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK 463aa98d7cfSKaiGai Kohei || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF 464aa98d7cfSKaiGai Kohei || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { 465aa98d7cfSKaiGai Kohei JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 46689291a9dSDavid Woodhouse "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 467c9f700f8SKaiGai Kohei offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 468aa98d7cfSKaiGai Kohei je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 469aa98d7cfSKaiGai Kohei je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 470aa98d7cfSKaiGai Kohei return EIO; 471aa98d7cfSKaiGai Kohei } 472aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr.ino); 473aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr.xid); 474c9f700f8SKaiGai Kohei ref->xseqno = je32_to_cpu(rr.xseqno); 475c9f700f8SKaiGai Kohei if (ref->xseqno > c->highest_xseqno) 476c9f700f8SKaiGai Kohei c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 477aa98d7cfSKaiGai Kohei 478aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 479c9f700f8SKaiGai Kohei complete: 480c9f700f8SKaiGai Kohei for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 481c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 482c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 483c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 484aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 485aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 486c9f700f8SKaiGai Kohei } 487c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 488c9f700f8SKaiGai Kohei } 489aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 490aa98d7cfSKaiGai Kohei 491aa98d7cfSKaiGai Kohei dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 492aa98d7cfSKaiGai Kohei ref->ino, ref->xid, ref_offset(ref->node)); 493aa98d7cfSKaiGai Kohei return 0; 494aa98d7cfSKaiGai Kohei } 495aa98d7cfSKaiGai Kohei 4969fe4854cSDavid Woodhouse static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 497aa98d7cfSKaiGai Kohei { 498aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 499aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 50089291a9dSDavid Woodhouse size_t length; 501c9f700f8SKaiGai Kohei uint32_t xseqno, phys_ofs = write_ofs(c); 502aa98d7cfSKaiGai Kohei int ret; 503aa98d7cfSKaiGai Kohei 504aa98d7cfSKaiGai Kohei rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 505aa98d7cfSKaiGai Kohei rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 506aa98d7cfSKaiGai Kohei rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 507aa98d7cfSKaiGai Kohei rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 508aa98d7cfSKaiGai Kohei 509c9f700f8SKaiGai Kohei xseqno = (c->highest_xseqno += 2); 510c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 511c9f700f8SKaiGai Kohei xseqno |= XREF_DELETE_MARKER; 512c9f700f8SKaiGai Kohei rr.ino = cpu_to_je32(ref->ino); 513c9f700f8SKaiGai Kohei rr.xid = cpu_to_je32(ref->xid); 514c9f700f8SKaiGai Kohei } else { 515aa98d7cfSKaiGai Kohei rr.ino = cpu_to_je32(ref->ic->ino); 516aa98d7cfSKaiGai Kohei rr.xid = cpu_to_je32(ref->xd->xid); 517c9f700f8SKaiGai Kohei } 518c9f700f8SKaiGai Kohei rr.xseqno = cpu_to_je32(xseqno); 519aa98d7cfSKaiGai Kohei rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 520aa98d7cfSKaiGai Kohei 521aa98d7cfSKaiGai Kohei ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 522aa98d7cfSKaiGai Kohei if (ret || sizeof(rr) != length) { 52389291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 524aa98d7cfSKaiGai Kohei ret, sizeof(rr), length, phys_ofs); 525aa98d7cfSKaiGai Kohei ret = ret ? ret : -EIO; 5262f785402SDavid Woodhouse if (length) 5272f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 5282f785402SDavid Woodhouse 529aa98d7cfSKaiGai Kohei return ret; 530aa98d7cfSKaiGai Kohei } 531c9f700f8SKaiGai Kohei /* success */ 532c9f700f8SKaiGai Kohei ref->xseqno = xseqno; 533c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 534aa98d7cfSKaiGai Kohei 535aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 536aa98d7cfSKaiGai Kohei 537aa98d7cfSKaiGai Kohei return 0; 538aa98d7cfSKaiGai Kohei } 539aa98d7cfSKaiGai Kohei 540aa98d7cfSKaiGai Kohei static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 5419fe4854cSDavid Woodhouse struct jffs2_xattr_datum *xd) 542aa98d7cfSKaiGai Kohei { 543aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 544aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 545aa98d7cfSKaiGai Kohei int ret; 546aa98d7cfSKaiGai Kohei 547aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 548aa98d7cfSKaiGai Kohei if (!ref) 549aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 550aa98d7cfSKaiGai Kohei ref->ic = ic; 551aa98d7cfSKaiGai Kohei ref->xd = xd; 552aa98d7cfSKaiGai Kohei 5539fe4854cSDavid Woodhouse ret = save_xattr_ref(c, ref); 554aa98d7cfSKaiGai Kohei if (ret) { 555aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 556aa98d7cfSKaiGai Kohei return ERR_PTR(ret); 557aa98d7cfSKaiGai Kohei } 558aa98d7cfSKaiGai Kohei 559aa98d7cfSKaiGai Kohei /* Chain to inode */ 5608f2b6f49SKaiGai Kohei ref->next = ic->xref; 5618f2b6f49SKaiGai Kohei ic->xref = ref; 562aa98d7cfSKaiGai Kohei 563aa98d7cfSKaiGai Kohei return ref; /* success */ 564aa98d7cfSKaiGai Kohei } 565aa98d7cfSKaiGai Kohei 5668a13695cSKaiGai Kohei static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 567c9f700f8SKaiGai Kohei { 568c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 569c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 570c9f700f8SKaiGai Kohei 571c9f700f8SKaiGai Kohei xd = ref->xd; 5728a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 573c9f700f8SKaiGai Kohei ref->ino = ref->ic->ino; 574c9f700f8SKaiGai Kohei ref->xid = ref->xd->xid; 575c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 576c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 577c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 578c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 579c9f700f8SKaiGai Kohei 5808a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 5818a13695cSKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 582c9f700f8SKaiGai Kohei 583*2c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) 584c9f700f8SKaiGai Kohei delete_xattr_datum(c, xd); 585c9f700f8SKaiGai Kohei } 586c9f700f8SKaiGai Kohei 587aa98d7cfSKaiGai Kohei void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 588aa98d7cfSKaiGai Kohei { 589aa98d7cfSKaiGai Kohei /* It's called from jffs2_clear_inode() on inode removing. 590aa98d7cfSKaiGai Kohei When an inode with XATTR is removed, those XATTRs must be removed. */ 5918a13695cSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 592aa98d7cfSKaiGai Kohei 593aa98d7cfSKaiGai Kohei if (!ic || ic->nlink > 0) 594aa98d7cfSKaiGai Kohei return; 595aa98d7cfSKaiGai Kohei 596c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 5978a13695cSKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 5988a13695cSKaiGai Kohei _ref = ref->next; 5998a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 600c9f700f8SKaiGai Kohei } 6018a13695cSKaiGai Kohei ic->xref = NULL; 602aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 603aa98d7cfSKaiGai Kohei } 604aa98d7cfSKaiGai Kohei 605aa98d7cfSKaiGai Kohei void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 606aa98d7cfSKaiGai Kohei { 607aa98d7cfSKaiGai Kohei /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 608aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 609aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 610aa98d7cfSKaiGai Kohei 611aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 6128f2b6f49SKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 6138f2b6f49SKaiGai Kohei _ref = ref->next; 614aa98d7cfSKaiGai Kohei xd = ref->xd; 615*2c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) { 616aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 617aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 618aa98d7cfSKaiGai Kohei } 619aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 620aa98d7cfSKaiGai Kohei } 6218f2b6f49SKaiGai Kohei ic->xref = NULL; 622aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 623aa98d7cfSKaiGai Kohei } 624aa98d7cfSKaiGai Kohei 6258f2b6f49SKaiGai Kohei static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 626aa98d7cfSKaiGai Kohei { 6278f2b6f49SKaiGai Kohei /* success of check_xattr_ref_inode() means taht inode (ic) dose not have 628aa98d7cfSKaiGai Kohei * duplicate name/value pairs. If duplicate name/value pair would be found, 629aa98d7cfSKaiGai Kohei * one will be removed. 630aa98d7cfSKaiGai Kohei */ 631c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 632aa98d7cfSKaiGai Kohei int rc = 0; 633aa98d7cfSKaiGai Kohei 634aa98d7cfSKaiGai Kohei if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 635aa98d7cfSKaiGai Kohei return 0; 636aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 637aa98d7cfSKaiGai Kohei retry: 638aa98d7cfSKaiGai Kohei rc = 0; 6398f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 640aa98d7cfSKaiGai Kohei if (!ref->xd->xname) { 641aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, ref->xd); 642aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 6438f2b6f49SKaiGai Kohei *pref = ref->next; 6448a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 645aa98d7cfSKaiGai Kohei goto retry; 646aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 647aa98d7cfSKaiGai Kohei goto out; 648aa98d7cfSKaiGai Kohei } 649c9f700f8SKaiGai Kohei for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 650aa98d7cfSKaiGai Kohei if (!cmp->xd->xname) { 651aa98d7cfSKaiGai Kohei ref->xd->flags |= JFFS2_XFLAGS_BIND; 652aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, cmp->xd); 653aa98d7cfSKaiGai Kohei ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 654aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 655c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6568a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 657aa98d7cfSKaiGai Kohei goto retry; 658aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 659aa98d7cfSKaiGai Kohei goto out; 660aa98d7cfSKaiGai Kohei } 661aa98d7cfSKaiGai Kohei if (ref->xd->xprefix == cmp->xd->xprefix 662aa98d7cfSKaiGai Kohei && !strcmp(ref->xd->xname, cmp->xd->xname)) { 663c9f700f8SKaiGai Kohei if (ref->xseqno > cmp->xseqno) { 664c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6658a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 666c9f700f8SKaiGai Kohei } else { 667c9f700f8SKaiGai Kohei *pref = ref->next; 6688a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 669c9f700f8SKaiGai Kohei } 670aa98d7cfSKaiGai Kohei goto retry; 671aa98d7cfSKaiGai Kohei } 672aa98d7cfSKaiGai Kohei } 673aa98d7cfSKaiGai Kohei } 674aa98d7cfSKaiGai Kohei ic->flags |= INO_FLAGS_XATTR_CHECKED; 675aa98d7cfSKaiGai Kohei out: 676aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 677aa98d7cfSKaiGai Kohei 678aa98d7cfSKaiGai Kohei return rc; 679aa98d7cfSKaiGai Kohei } 680aa98d7cfSKaiGai Kohei 681aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 682aa98d7cfSKaiGai Kohei * jffs2_init_xattr_subsystem(c) 683aa98d7cfSKaiGai Kohei * is used to initialize semaphore and list_head, and some variables. 684aa98d7cfSKaiGai Kohei * jffs2_find_xattr_datum(c, xid) 685aa98d7cfSKaiGai Kohei * is used to lookup xdatum while scanning process. 686aa98d7cfSKaiGai Kohei * jffs2_clear_xattr_subsystem(c) 687aa98d7cfSKaiGai Kohei * is used to release any xattr related objects. 688aa98d7cfSKaiGai Kohei * jffs2_build_xattr_subsystem(c) 689aa98d7cfSKaiGai Kohei * is used to associate xdatum and xref while super block building process. 690aa98d7cfSKaiGai Kohei * jffs2_setup_xattr_datum(c, xid, version) 691aa98d7cfSKaiGai Kohei * is used to insert xdatum while scanning process. 692aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 693aa98d7cfSKaiGai Kohei void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 694aa98d7cfSKaiGai Kohei { 695aa98d7cfSKaiGai Kohei int i; 696aa98d7cfSKaiGai Kohei 697aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) 698aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattrindex[i]); 699aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattr_unchecked); 700c9f700f8SKaiGai Kohei INIT_LIST_HEAD(&c->xattr_dead_list); 701c9f700f8SKaiGai Kohei c->xref_dead_list = NULL; 7028f2b6f49SKaiGai Kohei c->xref_temp = NULL; 703aa98d7cfSKaiGai Kohei 704aa98d7cfSKaiGai Kohei init_rwsem(&c->xattr_sem); 705c9f700f8SKaiGai Kohei c->highest_xid = 0; 706c9f700f8SKaiGai Kohei c->highest_xseqno = 0; 707aa98d7cfSKaiGai Kohei c->xdatum_mem_usage = 0; 708aa98d7cfSKaiGai Kohei c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 709aa98d7cfSKaiGai Kohei } 710aa98d7cfSKaiGai Kohei 711aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 712aa98d7cfSKaiGai Kohei { 713aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 714aa98d7cfSKaiGai Kohei int i = xid % XATTRINDEX_HASHSIZE; 715aa98d7cfSKaiGai Kohei 716aa98d7cfSKaiGai Kohei /* It's only used in scanning/building process. */ 717aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 718aa98d7cfSKaiGai Kohei 719aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 720aa98d7cfSKaiGai Kohei if (xd->xid==xid) 721aa98d7cfSKaiGai Kohei return xd; 722aa98d7cfSKaiGai Kohei } 723aa98d7cfSKaiGai Kohei return NULL; 724aa98d7cfSKaiGai Kohei } 725aa98d7cfSKaiGai Kohei 726aa98d7cfSKaiGai Kohei void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 727aa98d7cfSKaiGai Kohei { 728aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 729aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 730aa98d7cfSKaiGai Kohei int i; 731aa98d7cfSKaiGai Kohei 7328f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref = _ref) { 7338f2b6f49SKaiGai Kohei _ref = ref->next; 734aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 7358f2b6f49SKaiGai Kohei } 736c9f700f8SKaiGai Kohei 737c9f700f8SKaiGai Kohei for (ref=c->xref_dead_list; ref; ref = _ref) { 738c9f700f8SKaiGai Kohei _ref = ref->next; 739c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 740c9f700f8SKaiGai Kohei } 741aa98d7cfSKaiGai Kohei 742aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 743aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 744aa98d7cfSKaiGai Kohei list_del(&xd->xindex); 745aa98d7cfSKaiGai Kohei if (xd->xname) 746aa98d7cfSKaiGai Kohei kfree(xd->xname); 747aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 748aa98d7cfSKaiGai Kohei } 749aa98d7cfSKaiGai Kohei } 750c9f700f8SKaiGai Kohei 751c9f700f8SKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 752c9f700f8SKaiGai Kohei list_del(&xd->xindex); 753c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 754c9f700f8SKaiGai Kohei } 755aa98d7cfSKaiGai Kohei } 756aa98d7cfSKaiGai Kohei 757c9f700f8SKaiGai Kohei #define XREF_TMPHASH_SIZE (128) 758aa98d7cfSKaiGai Kohei void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 759aa98d7cfSKaiGai Kohei { 760aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 761c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; 762aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 763aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic; 764c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 765aa98d7cfSKaiGai Kohei int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 7668a13695cSKaiGai Kohei int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 767aa98d7cfSKaiGai Kohei 768aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 769aa98d7cfSKaiGai Kohei 7708a13695cSKaiGai Kohei /* Phase.1 : Merge same xref */ 771c9f700f8SKaiGai Kohei for (i=0; i < XREF_TMPHASH_SIZE; i++) 772c9f700f8SKaiGai Kohei xref_tmphash[i] = NULL; 7738f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref=_ref) { 774c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp; 775c9f700f8SKaiGai Kohei 7768f2b6f49SKaiGai Kohei _ref = ref->next; 777aa98d7cfSKaiGai Kohei if (ref_flags(ref->node) != REF_PRISTINE) { 778aa98d7cfSKaiGai Kohei if (verify_xattr_ref(c, ref)) { 779c9f700f8SKaiGai Kohei BUG_ON(ref->node->next_in_ino != (void *)ref); 780c9f700f8SKaiGai Kohei ref->node->next_in_ino = NULL; 781c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, ref->node); 782aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 783aa98d7cfSKaiGai Kohei continue; 784aa98d7cfSKaiGai Kohei } 785aa98d7cfSKaiGai Kohei } 786c9f700f8SKaiGai Kohei 787c9f700f8SKaiGai Kohei i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 788c9f700f8SKaiGai Kohei for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 789c9f700f8SKaiGai Kohei if (tmp->ino == ref->ino && tmp->xid == ref->xid) 790c9f700f8SKaiGai Kohei break; 791c9f700f8SKaiGai Kohei } 792c9f700f8SKaiGai Kohei if (tmp) { 793c9f700f8SKaiGai Kohei raw = ref->node; 794c9f700f8SKaiGai Kohei if (ref->xseqno > tmp->xseqno) { 795c9f700f8SKaiGai Kohei tmp->xseqno = ref->xseqno; 796c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node; 797c9f700f8SKaiGai Kohei tmp->node = raw; 798c9f700f8SKaiGai Kohei } else { 799c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node->next_in_ino; 800c9f700f8SKaiGai Kohei tmp->node->next_in_ino = raw; 801c9f700f8SKaiGai Kohei } 802c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 803c9f700f8SKaiGai Kohei continue; 804c9f700f8SKaiGai Kohei } else { 805c9f700f8SKaiGai Kohei ref->next = xref_tmphash[i]; 806c9f700f8SKaiGai Kohei xref_tmphash[i] = ref; 807c9f700f8SKaiGai Kohei } 808c9f700f8SKaiGai Kohei } 809c9f700f8SKaiGai Kohei c->xref_temp = NULL; 810c9f700f8SKaiGai Kohei 8118a13695cSKaiGai Kohei /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 812c9f700f8SKaiGai Kohei for (i=0; i < XREF_TMPHASH_SIZE; i++) { 813c9f700f8SKaiGai Kohei for (ref=xref_tmphash[i]; ref; ref=_ref) { 8148a13695cSKaiGai Kohei xref_count++; 815c9f700f8SKaiGai Kohei _ref = ref->next; 816c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 817c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 818c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8198a13695cSKaiGai Kohei xref_dead_count++; 820c9f700f8SKaiGai Kohei continue; 821c9f700f8SKaiGai Kohei } 822aa98d7cfSKaiGai Kohei /* At this point, ref->xid and ref->ino contain XID and inode number. 823aa98d7cfSKaiGai Kohei ref->xd and ref->ic are not valid yet. */ 824aa98d7cfSKaiGai Kohei xd = jffs2_find_xattr_datum(c, ref->xid); 825aa98d7cfSKaiGai Kohei ic = jffs2_get_ino_cache(c, ref->ino); 826aa98d7cfSKaiGai Kohei if (!xd || !ic) { 8278a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 828c9f700f8SKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 8298a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 830c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 831c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8328a13695cSKaiGai Kohei xref_orphan_count++; 833aa98d7cfSKaiGai Kohei continue; 834aa98d7cfSKaiGai Kohei } 835aa98d7cfSKaiGai Kohei ref->xd = xd; 836aa98d7cfSKaiGai Kohei ref->ic = ic; 837*2c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 8388f2b6f49SKaiGai Kohei ref->next = ic->xref; 8398f2b6f49SKaiGai Kohei ic->xref = ref; 840aa98d7cfSKaiGai Kohei } 841c9f700f8SKaiGai Kohei } 842aa98d7cfSKaiGai Kohei 8438a13695cSKaiGai Kohei /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 844aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 845aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 8468a13695cSKaiGai Kohei xdatum_count++; 847aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 848*2c887e23SKaiGai Kohei if (!atomic_read(&xd->refcnt)) { 8498a13695cSKaiGai Kohei dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 850c9f700f8SKaiGai Kohei xd->xid, xd->version); 8518a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 852c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 8538a13695cSKaiGai Kohei xdatum_orphan_count++; 854aa98d7cfSKaiGai Kohei continue; 855aa98d7cfSKaiGai Kohei } 856c9f700f8SKaiGai Kohei if (is_xattr_datum_unchecked(c, xd)) { 857c9f700f8SKaiGai Kohei dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 858c9f700f8SKaiGai Kohei xd->xid, xd->version); 859aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 860aa98d7cfSKaiGai Kohei xdatum_unchecked_count++; 861aa98d7cfSKaiGai Kohei } 862aa98d7cfSKaiGai Kohei } 863aa98d7cfSKaiGai Kohei } 864aa98d7cfSKaiGai Kohei /* build complete */ 8658a13695cSKaiGai Kohei JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 8668a13695cSKaiGai Kohei " (%u unchecked, %u orphan) and " 8678a13695cSKaiGai Kohei "%u of xref (%u dead, %u orphan) found.\n", 8688a13695cSKaiGai Kohei xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 8698a13695cSKaiGai Kohei xref_count, xref_dead_count, xref_orphan_count); 870aa98d7cfSKaiGai Kohei } 871aa98d7cfSKaiGai Kohei 872aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 873aa98d7cfSKaiGai Kohei uint32_t xid, uint32_t version) 874aa98d7cfSKaiGai Kohei { 875c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 876aa98d7cfSKaiGai Kohei 877c9f700f8SKaiGai Kohei xd = jffs2_find_xattr_datum(c, xid); 878c9f700f8SKaiGai Kohei if (!xd) { 879aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 880aa98d7cfSKaiGai Kohei if (!xd) 881aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 882aa98d7cfSKaiGai Kohei xd->xid = xid; 883aa98d7cfSKaiGai Kohei xd->version = version; 884aa98d7cfSKaiGai Kohei if (xd->xid > c->highest_xid) 885aa98d7cfSKaiGai Kohei c->highest_xid = xd->xid; 886aa98d7cfSKaiGai Kohei list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 887aa98d7cfSKaiGai Kohei } 888aa98d7cfSKaiGai Kohei return xd; 889aa98d7cfSKaiGai Kohei } 890aa98d7cfSKaiGai Kohei 891aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 892aa98d7cfSKaiGai Kohei * xprefix_to_handler(xprefix) 893aa98d7cfSKaiGai Kohei * is used to translate xprefix into xattr_handler. 894aa98d7cfSKaiGai Kohei * jffs2_listxattr(dentry, buffer, size) 895aa98d7cfSKaiGai Kohei * is an implementation of listxattr handler on jffs2. 896aa98d7cfSKaiGai Kohei * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 897aa98d7cfSKaiGai Kohei * is an implementation of getxattr handler on jffs2. 898aa98d7cfSKaiGai Kohei * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 899aa98d7cfSKaiGai Kohei * is an implementation of setxattr handler on jffs2. 900aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 901aa98d7cfSKaiGai Kohei struct xattr_handler *jffs2_xattr_handlers[] = { 902aa98d7cfSKaiGai Kohei &jffs2_user_xattr_handler, 903aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 904aa98d7cfSKaiGai Kohei &jffs2_security_xattr_handler, 905aa98d7cfSKaiGai Kohei #endif 906aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 907aa98d7cfSKaiGai Kohei &jffs2_acl_access_xattr_handler, 908aa98d7cfSKaiGai Kohei &jffs2_acl_default_xattr_handler, 909aa98d7cfSKaiGai Kohei #endif 910aa98d7cfSKaiGai Kohei &jffs2_trusted_xattr_handler, 911aa98d7cfSKaiGai Kohei NULL 912aa98d7cfSKaiGai Kohei }; 913aa98d7cfSKaiGai Kohei 914aa98d7cfSKaiGai Kohei static struct xattr_handler *xprefix_to_handler(int xprefix) { 915aa98d7cfSKaiGai Kohei struct xattr_handler *ret; 916aa98d7cfSKaiGai Kohei 917aa98d7cfSKaiGai Kohei switch (xprefix) { 918aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_USER: 919aa98d7cfSKaiGai Kohei ret = &jffs2_user_xattr_handler; 920aa98d7cfSKaiGai Kohei break; 921aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 922aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_SECURITY: 923aa98d7cfSKaiGai Kohei ret = &jffs2_security_xattr_handler; 924aa98d7cfSKaiGai Kohei break; 925aa98d7cfSKaiGai Kohei #endif 926aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 927aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_ACCESS: 928aa98d7cfSKaiGai Kohei ret = &jffs2_acl_access_xattr_handler; 929aa98d7cfSKaiGai Kohei break; 930aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_DEFAULT: 931aa98d7cfSKaiGai Kohei ret = &jffs2_acl_default_xattr_handler; 932aa98d7cfSKaiGai Kohei break; 933aa98d7cfSKaiGai Kohei #endif 934aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_TRUSTED: 935aa98d7cfSKaiGai Kohei ret = &jffs2_trusted_xattr_handler; 936aa98d7cfSKaiGai Kohei break; 937aa98d7cfSKaiGai Kohei default: 938aa98d7cfSKaiGai Kohei ret = NULL; 939aa98d7cfSKaiGai Kohei break; 940aa98d7cfSKaiGai Kohei } 941aa98d7cfSKaiGai Kohei return ret; 942aa98d7cfSKaiGai Kohei } 943aa98d7cfSKaiGai Kohei 944aa98d7cfSKaiGai Kohei ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 945aa98d7cfSKaiGai Kohei { 946aa98d7cfSKaiGai Kohei struct inode *inode = dentry->d_inode; 947aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 948aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 949aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 9508f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 951aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 952aa98d7cfSKaiGai Kohei struct xattr_handler *xhandle; 953aa98d7cfSKaiGai Kohei ssize_t len, rc; 954aa98d7cfSKaiGai Kohei int retry = 0; 955aa98d7cfSKaiGai Kohei 9568f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 957aa98d7cfSKaiGai Kohei if (unlikely(rc)) 958aa98d7cfSKaiGai Kohei return rc; 959aa98d7cfSKaiGai Kohei 960aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 961aa98d7cfSKaiGai Kohei retry: 962aa98d7cfSKaiGai Kohei len = 0; 9638f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 964aa98d7cfSKaiGai Kohei BUG_ON(ref->ic != ic); 965aa98d7cfSKaiGai Kohei xd = ref->xd; 966aa98d7cfSKaiGai Kohei if (!xd->xname) { 967aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 968aa98d7cfSKaiGai Kohei if (!retry) { 969aa98d7cfSKaiGai Kohei retry = 1; 970aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 971aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 972aa98d7cfSKaiGai Kohei goto retry; 973aa98d7cfSKaiGai Kohei } else { 974aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 975aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 9768f2b6f49SKaiGai Kohei *pref = ref->next; 9778a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 978aa98d7cfSKaiGai Kohei goto retry; 979aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 980aa98d7cfSKaiGai Kohei goto out; 981aa98d7cfSKaiGai Kohei } 982aa98d7cfSKaiGai Kohei } 983aa98d7cfSKaiGai Kohei xhandle = xprefix_to_handler(xd->xprefix); 984aa98d7cfSKaiGai Kohei if (!xhandle) 985aa98d7cfSKaiGai Kohei continue; 986aa98d7cfSKaiGai Kohei if (buffer) { 987aa98d7cfSKaiGai Kohei rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len); 988aa98d7cfSKaiGai Kohei } else { 989aa98d7cfSKaiGai Kohei rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len); 990aa98d7cfSKaiGai Kohei } 991aa98d7cfSKaiGai Kohei if (rc < 0) 992aa98d7cfSKaiGai Kohei goto out; 993aa98d7cfSKaiGai Kohei len += rc; 994aa98d7cfSKaiGai Kohei } 995aa98d7cfSKaiGai Kohei rc = len; 996aa98d7cfSKaiGai Kohei out: 997aa98d7cfSKaiGai Kohei if (!retry) { 998aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 999aa98d7cfSKaiGai Kohei } else { 1000aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1001aa98d7cfSKaiGai Kohei } 1002aa98d7cfSKaiGai Kohei return rc; 1003aa98d7cfSKaiGai Kohei } 1004aa98d7cfSKaiGai Kohei 1005aa98d7cfSKaiGai Kohei int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1006aa98d7cfSKaiGai Kohei char *buffer, size_t size) 1007aa98d7cfSKaiGai Kohei { 1008aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1009aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1010aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1011aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 10128f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 1013aa98d7cfSKaiGai Kohei int rc, retry = 0; 1014aa98d7cfSKaiGai Kohei 10158f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1016aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1017aa98d7cfSKaiGai Kohei return rc; 1018aa98d7cfSKaiGai Kohei 1019aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 1020aa98d7cfSKaiGai Kohei retry: 10218f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1022aa98d7cfSKaiGai Kohei BUG_ON(ref->ic!=ic); 1023aa98d7cfSKaiGai Kohei 1024aa98d7cfSKaiGai Kohei xd = ref->xd; 1025aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1026aa98d7cfSKaiGai Kohei continue; 1027aa98d7cfSKaiGai Kohei if (!xd->xname) { 1028aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 1029aa98d7cfSKaiGai Kohei if (!retry) { 1030aa98d7cfSKaiGai Kohei retry = 1; 1031aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1032aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1033aa98d7cfSKaiGai Kohei goto retry; 1034aa98d7cfSKaiGai Kohei } else { 1035aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1036aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 10378f2b6f49SKaiGai Kohei *pref = ref->next; 10388a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1039aa98d7cfSKaiGai Kohei goto retry; 1040aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) { 1041aa98d7cfSKaiGai Kohei goto out; 1042aa98d7cfSKaiGai Kohei } 1043aa98d7cfSKaiGai Kohei } 1044aa98d7cfSKaiGai Kohei } 1045aa98d7cfSKaiGai Kohei if (!strcmp(xname, xd->xname)) { 1046aa98d7cfSKaiGai Kohei rc = xd->value_len; 1047aa98d7cfSKaiGai Kohei if (buffer) { 1048aa98d7cfSKaiGai Kohei if (size < rc) { 1049aa98d7cfSKaiGai Kohei rc = -ERANGE; 1050aa98d7cfSKaiGai Kohei } else { 1051aa98d7cfSKaiGai Kohei memcpy(buffer, xd->xvalue, rc); 1052aa98d7cfSKaiGai Kohei } 1053aa98d7cfSKaiGai Kohei } 1054aa98d7cfSKaiGai Kohei goto out; 1055aa98d7cfSKaiGai Kohei } 1056aa98d7cfSKaiGai Kohei } 1057aa98d7cfSKaiGai Kohei rc = -ENODATA; 1058aa98d7cfSKaiGai Kohei out: 1059aa98d7cfSKaiGai Kohei if (!retry) { 1060aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1061aa98d7cfSKaiGai Kohei } else { 1062aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1063aa98d7cfSKaiGai Kohei } 1064aa98d7cfSKaiGai Kohei return rc; 1065aa98d7cfSKaiGai Kohei } 1066aa98d7cfSKaiGai Kohei 1067aa98d7cfSKaiGai Kohei int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1068aa98d7cfSKaiGai Kohei const char *buffer, size_t size, int flags) 1069aa98d7cfSKaiGai Kohei { 1070aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1071aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1072aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1073aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 10748f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, *newref, **pref; 10759fe4854cSDavid Woodhouse uint32_t length, request; 1076aa98d7cfSKaiGai Kohei int rc; 1077aa98d7cfSKaiGai Kohei 10788f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1079aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1080aa98d7cfSKaiGai Kohei return rc; 1081aa98d7cfSKaiGai Kohei 1082aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 10839fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1084aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1085aa98d7cfSKaiGai Kohei if (rc) { 1086aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1087aa98d7cfSKaiGai Kohei return rc; 1088aa98d7cfSKaiGai Kohei } 1089aa98d7cfSKaiGai Kohei 1090aa98d7cfSKaiGai Kohei /* Find existing xattr */ 1091aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1092aa98d7cfSKaiGai Kohei retry: 10938f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1094aa98d7cfSKaiGai Kohei xd = ref->xd; 1095aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1096aa98d7cfSKaiGai Kohei continue; 1097aa98d7cfSKaiGai Kohei if (!xd->xname) { 1098aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1099aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 11008f2b6f49SKaiGai Kohei *pref = ref->next; 11018a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1102aa98d7cfSKaiGai Kohei goto retry; 1103aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 1104aa98d7cfSKaiGai Kohei goto out; 1105aa98d7cfSKaiGai Kohei } 1106aa98d7cfSKaiGai Kohei if (!strcmp(xd->xname, xname)) { 1107aa98d7cfSKaiGai Kohei if (flags & XATTR_CREATE) { 1108aa98d7cfSKaiGai Kohei rc = -EEXIST; 1109aa98d7cfSKaiGai Kohei goto out; 1110aa98d7cfSKaiGai Kohei } 1111aa98d7cfSKaiGai Kohei if (!buffer) { 11128a13695cSKaiGai Kohei ref->ino = ic->ino; 11138a13695cSKaiGai Kohei ref->xid = xd->xid; 11148a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 11158a13695cSKaiGai Kohei rc = save_xattr_ref(c, ref); 11168a13695cSKaiGai Kohei if (!rc) { 11178f2b6f49SKaiGai Kohei *pref = ref->next; 11188a13695cSKaiGai Kohei spin_lock(&c->erase_completion_lock); 11198a13695cSKaiGai Kohei ref->next = c->xref_dead_list; 11208a13695cSKaiGai Kohei c->xref_dead_list = ref; 11218a13695cSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1122*2c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) 11238a13695cSKaiGai Kohei delete_xattr_datum(c, xd); 11248a13695cSKaiGai Kohei } else { 11258a13695cSKaiGai Kohei ref->ic = ic; 11268a13695cSKaiGai Kohei ref->xd = xd; 11278a13695cSKaiGai Kohei ref->xseqno &= ~XREF_DELETE_MARKER; 11288a13695cSKaiGai Kohei } 1129aa98d7cfSKaiGai Kohei goto out; 1130aa98d7cfSKaiGai Kohei } 1131aa98d7cfSKaiGai Kohei goto found; 1132aa98d7cfSKaiGai Kohei } 1133aa98d7cfSKaiGai Kohei } 1134aa98d7cfSKaiGai Kohei /* not found */ 1135aa98d7cfSKaiGai Kohei if (flags & XATTR_REPLACE) { 1136aa98d7cfSKaiGai Kohei rc = -ENODATA; 1137aa98d7cfSKaiGai Kohei goto out; 1138aa98d7cfSKaiGai Kohei } 1139aa98d7cfSKaiGai Kohei if (!buffer) { 1140c9f700f8SKaiGai Kohei rc = -ENODATA; 1141aa98d7cfSKaiGai Kohei goto out; 1142aa98d7cfSKaiGai Kohei } 1143aa98d7cfSKaiGai Kohei found: 11449fe4854cSDavid Woodhouse xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1145aa98d7cfSKaiGai Kohei if (IS_ERR(xd)) { 1146aa98d7cfSKaiGai Kohei rc = PTR_ERR(xd); 1147aa98d7cfSKaiGai Kohei goto out; 1148aa98d7cfSKaiGai Kohei } 1149aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1150aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1151aa98d7cfSKaiGai Kohei 1152aa98d7cfSKaiGai Kohei /* create xattr_ref */ 1153aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xref)); 11549fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1155aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1156c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 1157aa98d7cfSKaiGai Kohei if (rc) { 1158aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1159*2c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) 11608a13695cSKaiGai Kohei delete_xattr_datum(c, xd); 1161aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1162aa98d7cfSKaiGai Kohei return rc; 1163aa98d7cfSKaiGai Kohei } 11648f2b6f49SKaiGai Kohei if (ref) 11658f2b6f49SKaiGai Kohei *pref = ref->next; 11669fe4854cSDavid Woodhouse newref = create_xattr_ref(c, ic, xd); 1167aa98d7cfSKaiGai Kohei if (IS_ERR(newref)) { 11688f2b6f49SKaiGai Kohei if (ref) { 11698f2b6f49SKaiGai Kohei ref->next = ic->xref; 11708f2b6f49SKaiGai Kohei ic->xref = ref; 11718f2b6f49SKaiGai Kohei } 1172aa98d7cfSKaiGai Kohei rc = PTR_ERR(newref); 1173*2c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) 11748a13695cSKaiGai Kohei delete_xattr_datum(c, xd); 1175aa98d7cfSKaiGai Kohei } else if (ref) { 11768a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1177aa98d7cfSKaiGai Kohei } 1178aa98d7cfSKaiGai Kohei out: 1179aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1180aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1181aa98d7cfSKaiGai Kohei return rc; 1182aa98d7cfSKaiGai Kohei } 1183aa98d7cfSKaiGai Kohei 1184aa98d7cfSKaiGai Kohei /* -------- garbage collector functions ------------- 1185c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1186aa98d7cfSKaiGai Kohei * is used to move xdatum into new node. 1187c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1188aa98d7cfSKaiGai Kohei * is used to move xref into new node. 1189aa98d7cfSKaiGai Kohei * jffs2_verify_xattr(c) 1190aa98d7cfSKaiGai Kohei * is used to call do_verify_xattr_datum() before garbage collecting. 11918a13695cSKaiGai Kohei * jffs2_release_xattr_datum(c, xd) 11928a13695cSKaiGai Kohei * is used to release an in-memory object of xdatum. 11938a13695cSKaiGai Kohei * jffs2_release_xattr_ref(c, ref) 11948a13695cSKaiGai Kohei * is used to release an in-memory object of xref. 1195aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 1196c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1197c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1198aa98d7cfSKaiGai Kohei { 11999fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1200c9f700f8SKaiGai Kohei int rc = 0; 1201aa98d7cfSKaiGai Kohei 1202084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1203c9f700f8SKaiGai Kohei if (xd->node != raw) 1204c9f700f8SKaiGai Kohei goto out; 12058a13695cSKaiGai Kohei if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1206c9f700f8SKaiGai Kohei goto out; 1207aa98d7cfSKaiGai Kohei 1208aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 12098a13695cSKaiGai Kohei if (unlikely(rc)) { 12108a13695cSKaiGai Kohei rc = (rc > 0) ? 0 : rc; 1211084702e0SKaiGai Kohei goto out; 1212aa98d7cfSKaiGai Kohei } 12138a13695cSKaiGai Kohei old_ofs = ref_offset(xd->node); 12148a13695cSKaiGai Kohei totlen = PAD(sizeof(struct jffs2_raw_xattr) 12158a13695cSKaiGai Kohei + xd->name_len + 1 + xd->value_len); 12169fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1217c9f700f8SKaiGai Kohei if (rc) { 1218c9f700f8SKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1219084702e0SKaiGai Kohei rc = rc ? rc : -EBADFD; 1220084702e0SKaiGai Kohei goto out; 1221aa98d7cfSKaiGai Kohei } 12229fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 1223aa98d7cfSKaiGai Kohei if (!rc) 1224aa98d7cfSKaiGai Kohei dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1225aa98d7cfSKaiGai Kohei xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1226084702e0SKaiGai Kohei out: 1227c9f700f8SKaiGai Kohei if (!rc) 1228c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1229084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1230aa98d7cfSKaiGai Kohei return rc; 1231aa98d7cfSKaiGai Kohei } 1232aa98d7cfSKaiGai Kohei 1233c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1234c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1235aa98d7cfSKaiGai Kohei { 12369fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1237c9f700f8SKaiGai Kohei int rc = 0; 1238aa98d7cfSKaiGai Kohei 1239084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1240aa98d7cfSKaiGai Kohei BUG_ON(!ref->node); 1241aa98d7cfSKaiGai Kohei 1242c9f700f8SKaiGai Kohei if (ref->node != raw) 1243c9f700f8SKaiGai Kohei goto out; 1244c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1245084702e0SKaiGai Kohei goto out; 1246084702e0SKaiGai Kohei 1247c9f700f8SKaiGai Kohei old_ofs = ref_offset(ref->node); 1248c9f700f8SKaiGai Kohei totlen = ref_totlen(c, c->gcblock, ref->node); 1249c9f700f8SKaiGai Kohei 12509fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1251c9f700f8SKaiGai Kohei if (rc) { 1252c9f700f8SKaiGai Kohei JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 1253aa98d7cfSKaiGai Kohei __FUNCTION__, rc, totlen); 1254084702e0SKaiGai Kohei rc = rc ? rc : -EBADFD; 1255084702e0SKaiGai Kohei goto out; 1256aa98d7cfSKaiGai Kohei } 12579fe4854cSDavid Woodhouse rc = save_xattr_ref(c, ref); 1258aa98d7cfSKaiGai Kohei if (!rc) 1259aa98d7cfSKaiGai Kohei dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1260aa98d7cfSKaiGai Kohei ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1261084702e0SKaiGai Kohei out: 1262c9f700f8SKaiGai Kohei if (!rc) 1263c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1264084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1265aa98d7cfSKaiGai Kohei return rc; 1266aa98d7cfSKaiGai Kohei } 1267aa98d7cfSKaiGai Kohei 1268aa98d7cfSKaiGai Kohei int jffs2_verify_xattr(struct jffs2_sb_info *c) 1269aa98d7cfSKaiGai Kohei { 1270aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 1271c9f700f8SKaiGai Kohei struct jffs2_eraseblock *jeb; 1272c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 1273c9f700f8SKaiGai Kohei uint32_t totlen; 1274aa98d7cfSKaiGai Kohei int rc; 1275aa98d7cfSKaiGai Kohei 1276aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1277aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1278aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 1279c9f700f8SKaiGai Kohei if (rc < 0) 1280c9f700f8SKaiGai Kohei continue; 1281aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 1282c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 1283c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1284c9f700f8SKaiGai Kohei if (ref_flags(raw) != REF_UNCHECKED) 1285c9f700f8SKaiGai Kohei continue; 1286c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1287c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 1288c9f700f8SKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 1289c9f700f8SKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1290c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) 1291c9f700f8SKaiGai Kohei | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1292aa98d7cfSKaiGai Kohei } 12938a13695cSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_DEAD) 1294c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_dead_list); 1295c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1296aa98d7cfSKaiGai Kohei } 1297aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1298aa98d7cfSKaiGai Kohei return list_empty(&c->xattr_unchecked) ? 1 : 0; 1299aa98d7cfSKaiGai Kohei } 1300c9f700f8SKaiGai Kohei 1301c9f700f8SKaiGai Kohei void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1302c9f700f8SKaiGai Kohei { 1303c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 1304*2c887e23SKaiGai Kohei if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1305c9f700f8SKaiGai Kohei return; 1306c9f700f8SKaiGai Kohei 1307c9f700f8SKaiGai Kohei list_del(&xd->xindex); 1308c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 1309c9f700f8SKaiGai Kohei } 1310c9f700f8SKaiGai Kohei 1311c9f700f8SKaiGai Kohei void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1312c9f700f8SKaiGai Kohei { 1313c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 1314c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp, **ptmp; 1315c9f700f8SKaiGai Kohei 1316c9f700f8SKaiGai Kohei if (ref->node != (void *)ref) 1317c9f700f8SKaiGai Kohei return; 1318c9f700f8SKaiGai Kohei 1319c9f700f8SKaiGai Kohei for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1320c9f700f8SKaiGai Kohei if (ref == tmp) { 1321c9f700f8SKaiGai Kohei *ptmp = tmp->next; 1322c9f700f8SKaiGai Kohei break; 1323c9f700f8SKaiGai Kohei } 1324c9f700f8SKaiGai Kohei } 13258a13695cSKaiGai Kohei jffs2_free_xattr_ref(ref); 1326c9f700f8SKaiGai Kohei } 1327