1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4c00c310eSDavid Woodhouse * Copyright © 2006 NEC Corporation 5aa98d7cfSKaiGai Kohei * 6652ecc20SKaiGai Kohei * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7652ecc20SKaiGai Kohei * 8652ecc20SKaiGai Kohei * For licensing information, see the file 'LICENCE' in this directory. 9652ecc20SKaiGai Kohei * 10652ecc20SKaiGai Kohei */ 11c00c310eSDavid Woodhouse 129bbf29e4SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 139bbf29e4SJoe Perches 14aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 15aa98d7cfSKaiGai Kohei #include <linux/slab.h> 16aa98d7cfSKaiGai Kohei #include <linux/fs.h> 17aa98d7cfSKaiGai Kohei #include <linux/time.h> 18aa98d7cfSKaiGai Kohei #include <linux/pagemap.h> 19aa98d7cfSKaiGai Kohei #include <linux/highmem.h> 20aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 21aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 22aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 23aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 24aa98d7cfSKaiGai Kohei #include "nodelist.h" 25aa98d7cfSKaiGai Kohei /* -------- xdatum related functions ---------------- 26aa98d7cfSKaiGai Kohei * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 27aa98d7cfSKaiGai Kohei * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 28aa98d7cfSKaiGai Kohei * the index of the xattr name/value pair cache (c->xattrindex). 29c9f700f8SKaiGai Kohei * is_xattr_datum_unchecked(c, xd) 30c9f700f8SKaiGai Kohei * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 31c9f700f8SKaiGai Kohei * unchecked, it returns 0. 32aa98d7cfSKaiGai Kohei * unload_xattr_datum(c, xd) 33aa98d7cfSKaiGai Kohei * is used to release xattr name/value pair and detach from c->xattrindex. 34aa98d7cfSKaiGai Kohei * reclaim_xattr_datum(c) 35aa98d7cfSKaiGai Kohei * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 36af901ca1SAndré Goddard Rosa * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold 37aa98d7cfSKaiGai Kohei * is hard coded as 32KiB. 38aa98d7cfSKaiGai Kohei * do_verify_xattr_datum(c, xd) 39aa98d7cfSKaiGai Kohei * is used to load the xdatum informations without name/value pair from the medium. 40aa98d7cfSKaiGai Kohei * It's necessary once, because those informations are not collected during mounting 41aa98d7cfSKaiGai Kohei * process when EBS is enabled. 42aa98d7cfSKaiGai Kohei * 0 will be returned, if success. An negative return value means recoverable error, and 43aa98d7cfSKaiGai Kohei * positive return value means unrecoverable error. Thus, caller must remove this xdatum 44aa98d7cfSKaiGai Kohei * and xref when it returned positive value. 45aa98d7cfSKaiGai Kohei * do_load_xattr_datum(c, xd) 46aa98d7cfSKaiGai Kohei * is used to load name/value pair from the medium. 47aa98d7cfSKaiGai Kohei * The meanings of return value is same as do_verify_xattr_datum(). 48aa98d7cfSKaiGai Kohei * load_xattr_datum(c, xd) 49aa98d7cfSKaiGai Kohei * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 50aa98d7cfSKaiGai Kohei * If xd need to call do_verify_xattr_datum() at first, it's called before calling 51aa98d7cfSKaiGai Kohei * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 529fe4854cSDavid Woodhouse * save_xattr_datum(c, xd) 53aa98d7cfSKaiGai Kohei * is used to write xdatum to medium. xd->version will be incremented. 549fe4854cSDavid Woodhouse * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 55aa98d7cfSKaiGai Kohei * is used to create new xdatum and write to medium. 56c6e8c6ccSKaiGai Kohei * unrefer_xattr_datum(c, xd) 57c6e8c6ccSKaiGai Kohei * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD 58c6e8c6ccSKaiGai Kohei * is set on xd->flags and chained xattr_dead_list or release it immediately. 59c6e8c6ccSKaiGai Kohei * In the first case, the garbage collector release it later. 60aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 61aa98d7cfSKaiGai Kohei static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 62aa98d7cfSKaiGai Kohei { 63aa98d7cfSKaiGai Kohei int name_len = strlen(xname); 64aa98d7cfSKaiGai Kohei 65aa98d7cfSKaiGai Kohei return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 66aa98d7cfSKaiGai Kohei } 67aa98d7cfSKaiGai Kohei 68c9f700f8SKaiGai Kohei static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 69c9f700f8SKaiGai Kohei { 70c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 71c9f700f8SKaiGai Kohei int rc = 0; 72c9f700f8SKaiGai Kohei 73c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 74c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 75c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 76c9f700f8SKaiGai Kohei rc = 1; 77c9f700f8SKaiGai Kohei break; 78c9f700f8SKaiGai Kohei } 79c9f700f8SKaiGai Kohei } 80c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 81c9f700f8SKaiGai Kohei return rc; 82c9f700f8SKaiGai Kohei } 83c9f700f8SKaiGai Kohei 84aa98d7cfSKaiGai Kohei static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 85aa98d7cfSKaiGai Kohei { 86aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 878e24eea7SHarvey Harrison D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); 88aa98d7cfSKaiGai Kohei if (xd->xname) { 89aa98d7cfSKaiGai Kohei c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 90aa98d7cfSKaiGai Kohei kfree(xd->xname); 91aa98d7cfSKaiGai Kohei } 92aa98d7cfSKaiGai Kohei 93aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 94aa98d7cfSKaiGai Kohei xd->hashkey = 0; 95aa98d7cfSKaiGai Kohei xd->xname = NULL; 96aa98d7cfSKaiGai Kohei xd->xvalue = NULL; 97aa98d7cfSKaiGai Kohei } 98aa98d7cfSKaiGai Kohei 99aa98d7cfSKaiGai Kohei static void reclaim_xattr_datum(struct jffs2_sb_info *c) 100aa98d7cfSKaiGai Kohei { 101aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 102aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 103aa98d7cfSKaiGai Kohei uint32_t target, before; 104aa98d7cfSKaiGai Kohei static int index = 0; 105aa98d7cfSKaiGai Kohei int count; 106aa98d7cfSKaiGai Kohei 107aa98d7cfSKaiGai Kohei if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 108aa98d7cfSKaiGai Kohei return; 109aa98d7cfSKaiGai Kohei 110aa98d7cfSKaiGai Kohei before = c->xdatum_mem_usage; 111aa98d7cfSKaiGai Kohei target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 112aa98d7cfSKaiGai Kohei for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 113aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 114aa98d7cfSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_HOT) { 115aa98d7cfSKaiGai Kohei xd->flags &= ~JFFS2_XFLAGS_HOT; 116aa98d7cfSKaiGai Kohei } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 117aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 118aa98d7cfSKaiGai Kohei } 119aa98d7cfSKaiGai Kohei if (c->xdatum_mem_usage <= target) 120aa98d7cfSKaiGai Kohei goto out; 121aa98d7cfSKaiGai Kohei } 122aa98d7cfSKaiGai Kohei index = (index+1) % XATTRINDEX_HASHSIZE; 123aa98d7cfSKaiGai Kohei } 124aa98d7cfSKaiGai Kohei out: 125aa98d7cfSKaiGai Kohei JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 126aa98d7cfSKaiGai Kohei before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 127aa98d7cfSKaiGai Kohei } 128aa98d7cfSKaiGai Kohei 129aa98d7cfSKaiGai Kohei static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 130aa98d7cfSKaiGai Kohei { 131aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 132aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 133c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 134aa98d7cfSKaiGai Kohei struct jffs2_raw_xattr rx; 135aa98d7cfSKaiGai Kohei size_t readlen; 136c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 137aa98d7cfSKaiGai Kohei int rc; 138aa98d7cfSKaiGai Kohei 139c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 140c9f700f8SKaiGai Kohei offset = ref_offset(xd->node); 141c9f700f8SKaiGai Kohei if (ref_flags(xd->node) == REF_PRISTINE) 142c9f700f8SKaiGai Kohei goto complete; 143c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 144aa98d7cfSKaiGai Kohei 145c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 146aa98d7cfSKaiGai Kohei if (rc || readlen != sizeof(rx)) { 14789291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 148c9f700f8SKaiGai Kohei rc, sizeof(rx), readlen, offset); 149aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 150aa98d7cfSKaiGai Kohei } 151aa98d7cfSKaiGai Kohei crc = crc32(0, &rx, sizeof(rx) - 4); 152aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rx.node_crc)) { 153aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 154c9f700f8SKaiGai Kohei offset, je32_to_cpu(rx.hdr_crc), crc); 155c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 156f326966bSVasiliy Kulikov return -EIO; 157aa98d7cfSKaiGai Kohei } 1588a13695cSKaiGai Kohei totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 159aa98d7cfSKaiGai Kohei if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 160aa98d7cfSKaiGai Kohei || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 161aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.totlen) != totlen 162aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.xid) != xd->xid 163aa98d7cfSKaiGai Kohei || je32_to_cpu(rx.version) != xd->version) { 164aa98d7cfSKaiGai Kohei JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 165aa98d7cfSKaiGai Kohei "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 166c9f700f8SKaiGai Kohei offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, 167aa98d7cfSKaiGai Kohei je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, 168aa98d7cfSKaiGai Kohei je32_to_cpu(rx.totlen), totlen, 169aa98d7cfSKaiGai Kohei je32_to_cpu(rx.xid), xd->xid, 170aa98d7cfSKaiGai Kohei je32_to_cpu(rx.version), xd->version); 171c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 172f326966bSVasiliy Kulikov return -EIO; 173aa98d7cfSKaiGai Kohei } 174aa98d7cfSKaiGai Kohei xd->xprefix = rx.xprefix; 175aa98d7cfSKaiGai Kohei xd->name_len = rx.name_len; 176aa98d7cfSKaiGai Kohei xd->value_len = je16_to_cpu(rx.value_len); 177aa98d7cfSKaiGai Kohei xd->data_crc = je32_to_cpu(rx.data_crc); 178aa98d7cfSKaiGai Kohei 179aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 180c9f700f8SKaiGai Kohei complete: 181c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 182c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 183c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 184c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 185aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 186aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 187c9f700f8SKaiGai Kohei } 188c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 189c9f700f8SKaiGai Kohei } 190aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 191aa98d7cfSKaiGai Kohei 192aa98d7cfSKaiGai Kohei /* unchecked xdatum is chained with c->xattr_unchecked */ 193aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 194aa98d7cfSKaiGai Kohei 195aa98d7cfSKaiGai Kohei dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", 196aa98d7cfSKaiGai Kohei xd->xid, xd->version); 197aa98d7cfSKaiGai Kohei 198aa98d7cfSKaiGai Kohei return 0; 199aa98d7cfSKaiGai Kohei } 200aa98d7cfSKaiGai Kohei 201aa98d7cfSKaiGai Kohei static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 202aa98d7cfSKaiGai Kohei { 203aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 204aa98d7cfSKaiGai Kohei char *data; 205aa98d7cfSKaiGai Kohei size_t readlen; 206aa98d7cfSKaiGai Kohei uint32_t crc, length; 207aa98d7cfSKaiGai Kohei int i, ret, retry = 0; 208aa98d7cfSKaiGai Kohei 209aa98d7cfSKaiGai Kohei BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 210aa98d7cfSKaiGai Kohei BUG_ON(!list_empty(&xd->xindex)); 211aa98d7cfSKaiGai Kohei retry: 212aa98d7cfSKaiGai Kohei length = xd->name_len + 1 + xd->value_len; 213aa98d7cfSKaiGai Kohei data = kmalloc(length, GFP_KERNEL); 214aa98d7cfSKaiGai Kohei if (!data) 215aa98d7cfSKaiGai Kohei return -ENOMEM; 216aa98d7cfSKaiGai Kohei 217aa98d7cfSKaiGai Kohei ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 218aa98d7cfSKaiGai Kohei length, &readlen, data); 219aa98d7cfSKaiGai Kohei 220aa98d7cfSKaiGai Kohei if (ret || length!=readlen) { 22189291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 222aa98d7cfSKaiGai Kohei ret, length, readlen, ref_offset(xd->node)); 223aa98d7cfSKaiGai Kohei kfree(data); 224aa98d7cfSKaiGai Kohei return ret ? ret : -EIO; 225aa98d7cfSKaiGai Kohei } 226aa98d7cfSKaiGai Kohei 227aa98d7cfSKaiGai Kohei data[xd->name_len] = '\0'; 228aa98d7cfSKaiGai Kohei crc = crc32(0, data, length); 229aa98d7cfSKaiGai Kohei if (crc != xd->data_crc) { 230aa98d7cfSKaiGai Kohei JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" 231aa98d7cfSKaiGai Kohei " at %#08x, read: 0x%08x calculated: 0x%08x\n", 232aa98d7cfSKaiGai Kohei ref_offset(xd->node), xd->data_crc, crc); 233aa98d7cfSKaiGai Kohei kfree(data); 234c9f700f8SKaiGai Kohei xd->flags |= JFFS2_XFLAGS_INVALID; 235f326966bSVasiliy Kulikov return -EIO; 236aa98d7cfSKaiGai Kohei } 237aa98d7cfSKaiGai Kohei 238aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 239aa98d7cfSKaiGai Kohei xd->xname = data; 240aa98d7cfSKaiGai Kohei xd->xvalue = data + xd->name_len+1; 241aa98d7cfSKaiGai Kohei 242aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += length; 243aa98d7cfSKaiGai Kohei 244aa98d7cfSKaiGai Kohei xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 245aa98d7cfSKaiGai Kohei i = xd->hashkey % XATTRINDEX_HASHSIZE; 246aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 247aa98d7cfSKaiGai Kohei if (!retry) { 248aa98d7cfSKaiGai Kohei retry = 1; 249aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 250aa98d7cfSKaiGai Kohei if (!xd->xname) 251aa98d7cfSKaiGai Kohei goto retry; 252aa98d7cfSKaiGai Kohei } 253aa98d7cfSKaiGai Kohei 254aa98d7cfSKaiGai Kohei dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 255aa98d7cfSKaiGai Kohei xd->xid, xd->xprefix, xd->xname); 256aa98d7cfSKaiGai Kohei 257aa98d7cfSKaiGai Kohei return 0; 258aa98d7cfSKaiGai Kohei } 259aa98d7cfSKaiGai Kohei 260aa98d7cfSKaiGai Kohei static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 261aa98d7cfSKaiGai Kohei { 262aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem); 263aa98d7cfSKaiGai Kohei * rc < 0 : recoverable error, try again 264aa98d7cfSKaiGai Kohei * rc = 0 : success 265aa98d7cfSKaiGai Kohei * rc > 0 : Unrecoverable error, this node should be deleted. 266aa98d7cfSKaiGai Kohei */ 267aa98d7cfSKaiGai Kohei int rc = 0; 268c9f700f8SKaiGai Kohei 2698a13695cSKaiGai Kohei BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 270c9f700f8SKaiGai Kohei if (xd->xname) 271c9f700f8SKaiGai Kohei return 0; 272c9f700f8SKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_INVALID) 273f326966bSVasiliy Kulikov return -EIO; 274c9f700f8SKaiGai Kohei if (unlikely(is_xattr_datum_unchecked(c, xd))) 275aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 276aa98d7cfSKaiGai Kohei if (!rc) 277aa98d7cfSKaiGai Kohei rc = do_load_xattr_datum(c, xd); 278aa98d7cfSKaiGai Kohei return rc; 279aa98d7cfSKaiGai Kohei } 280aa98d7cfSKaiGai Kohei 2819fe4854cSDavid Woodhouse static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 282aa98d7cfSKaiGai Kohei { 283aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 2842f785402SDavid Woodhouse struct jffs2_raw_xattr rx; 285aa98d7cfSKaiGai Kohei struct kvec vecs[2]; 28689291a9dSDavid Woodhouse size_t length; 2878a13695cSKaiGai Kohei int rc, totlen; 2889fe4854cSDavid Woodhouse uint32_t phys_ofs = write_ofs(c); 289aa98d7cfSKaiGai Kohei 2908a13695cSKaiGai Kohei BUG_ON(!xd->xname); 2918a13695cSKaiGai Kohei BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 292aa98d7cfSKaiGai Kohei 293aa98d7cfSKaiGai Kohei vecs[0].iov_base = ℞ 2948a13695cSKaiGai Kohei vecs[0].iov_len = sizeof(rx); 295aa98d7cfSKaiGai Kohei vecs[1].iov_base = xd->xname; 296aa98d7cfSKaiGai Kohei vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 2978a13695cSKaiGai Kohei totlen = vecs[0].iov_len + vecs[1].iov_len; 2988a13695cSKaiGai Kohei 299aa98d7cfSKaiGai Kohei /* Setup raw-xattr */ 300c9f700f8SKaiGai Kohei memset(&rx, 0, sizeof(rx)); 301aa98d7cfSKaiGai Kohei rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 302aa98d7cfSKaiGai Kohei rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 303aa98d7cfSKaiGai Kohei rx.totlen = cpu_to_je32(PAD(totlen)); 304aa98d7cfSKaiGai Kohei rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 305aa98d7cfSKaiGai Kohei 306aa98d7cfSKaiGai Kohei rx.xid = cpu_to_je32(xd->xid); 307aa98d7cfSKaiGai Kohei rx.version = cpu_to_je32(++xd->version); 308aa98d7cfSKaiGai Kohei rx.xprefix = xd->xprefix; 309aa98d7cfSKaiGai Kohei rx.name_len = xd->name_len; 310aa98d7cfSKaiGai Kohei rx.value_len = cpu_to_je16(xd->value_len); 311aa98d7cfSKaiGai Kohei rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 312aa98d7cfSKaiGai Kohei rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 313aa98d7cfSKaiGai Kohei 3148a13695cSKaiGai Kohei rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 315aa98d7cfSKaiGai Kohei if (rc || totlen != length) { 31689291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 317aa98d7cfSKaiGai Kohei rc, totlen, length, phys_ofs); 318aa98d7cfSKaiGai Kohei rc = rc ? rc : -EIO; 3192f785402SDavid Woodhouse if (length) 3202f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 3212f785402SDavid Woodhouse 322aa98d7cfSKaiGai Kohei return rc; 323aa98d7cfSKaiGai Kohei } 324aa98d7cfSKaiGai Kohei /* success */ 325c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 326aa98d7cfSKaiGai Kohei 327aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 328aa98d7cfSKaiGai Kohei xd->xid, xd->version, xd->xprefix, xd->xname); 329aa98d7cfSKaiGai Kohei 330aa98d7cfSKaiGai Kohei return 0; 331aa98d7cfSKaiGai Kohei } 332aa98d7cfSKaiGai Kohei 333aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 334aa98d7cfSKaiGai Kohei int xprefix, const char *xname, 3359fe4854cSDavid Woodhouse const char *xvalue, int xsize) 336aa98d7cfSKaiGai Kohei { 337aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 338aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 339aa98d7cfSKaiGai Kohei uint32_t hashkey, name_len; 340aa98d7cfSKaiGai Kohei char *data; 341aa98d7cfSKaiGai Kohei int i, rc; 342aa98d7cfSKaiGai Kohei 343aa98d7cfSKaiGai Kohei /* Search xattr_datum has same xname/xvalue by index */ 344aa98d7cfSKaiGai Kohei hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 345aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 346aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 347aa98d7cfSKaiGai Kohei if (xd->hashkey==hashkey 348aa98d7cfSKaiGai Kohei && xd->xprefix==xprefix 349aa98d7cfSKaiGai Kohei && xd->value_len==xsize 350aa98d7cfSKaiGai Kohei && !strcmp(xd->xname, xname) 351aa98d7cfSKaiGai Kohei && !memcmp(xd->xvalue, xvalue, xsize)) { 3522c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 353aa98d7cfSKaiGai Kohei return xd; 354aa98d7cfSKaiGai Kohei } 355aa98d7cfSKaiGai Kohei } 356aa98d7cfSKaiGai Kohei 357aa98d7cfSKaiGai Kohei /* Not found, Create NEW XATTR-Cache */ 358aa98d7cfSKaiGai Kohei name_len = strlen(xname); 359aa98d7cfSKaiGai Kohei 360aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 361aa98d7cfSKaiGai Kohei if (!xd) 362aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 363aa98d7cfSKaiGai Kohei 364aa98d7cfSKaiGai Kohei data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 365aa98d7cfSKaiGai Kohei if (!data) { 366aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 367aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 368aa98d7cfSKaiGai Kohei } 369aa98d7cfSKaiGai Kohei strcpy(data, xname); 370aa98d7cfSKaiGai Kohei memcpy(data + name_len + 1, xvalue, xsize); 371aa98d7cfSKaiGai Kohei 3722c887e23SKaiGai Kohei atomic_set(&xd->refcnt, 1); 373aa98d7cfSKaiGai Kohei xd->xid = ++c->highest_xid; 374aa98d7cfSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_HOT; 375aa98d7cfSKaiGai Kohei xd->xprefix = xprefix; 376aa98d7cfSKaiGai Kohei 377aa98d7cfSKaiGai Kohei xd->hashkey = hashkey; 378aa98d7cfSKaiGai Kohei xd->xname = data; 379aa98d7cfSKaiGai Kohei xd->xvalue = data + name_len + 1; 380aa98d7cfSKaiGai Kohei xd->name_len = name_len; 381aa98d7cfSKaiGai Kohei xd->value_len = xsize; 382aa98d7cfSKaiGai Kohei xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 383aa98d7cfSKaiGai Kohei 3849fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 385aa98d7cfSKaiGai Kohei if (rc) { 386aa98d7cfSKaiGai Kohei kfree(xd->xname); 387aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 388aa98d7cfSKaiGai Kohei return ERR_PTR(rc); 389aa98d7cfSKaiGai Kohei } 390aa98d7cfSKaiGai Kohei 391aa98d7cfSKaiGai Kohei /* Insert Hash Index */ 392aa98d7cfSKaiGai Kohei i = hashkey % XATTRINDEX_HASHSIZE; 393aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattrindex[i]); 394aa98d7cfSKaiGai Kohei 395aa98d7cfSKaiGai Kohei c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 396aa98d7cfSKaiGai Kohei reclaim_xattr_datum(c); 397aa98d7cfSKaiGai Kohei 398aa98d7cfSKaiGai Kohei return xd; 399aa98d7cfSKaiGai Kohei } 400aa98d7cfSKaiGai Kohei 401c6e8c6ccSKaiGai Kohei static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 402c9f700f8SKaiGai Kohei { 403c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 404c6e8c6ccSKaiGai Kohei if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { 405c9f700f8SKaiGai Kohei unload_xattr_datum(c, xd); 4068a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 4078a13695cSKaiGai Kohei if (xd->node == (void *)xd) { 4088a13695cSKaiGai Kohei BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); 4098a13695cSKaiGai Kohei jffs2_free_xattr_datum(xd); 4108a13695cSKaiGai Kohei } else { 411c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_dead_list); 412c9f700f8SKaiGai Kohei } 413c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 414c6e8c6ccSKaiGai Kohei 415a6b1d82dSJeff Garzik dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", 416a6b1d82dSJeff Garzik xd->xid, xd->version); 417c6e8c6ccSKaiGai Kohei } 418c9f700f8SKaiGai Kohei } 419c9f700f8SKaiGai Kohei 42021b9879bSKaiGai Kohei /* -------- xref related functions ------------------ 421aa98d7cfSKaiGai Kohei * verify_xattr_ref(c, ref) 422aa98d7cfSKaiGai Kohei * is used to load xref information from medium. Because summary data does not 423aa98d7cfSKaiGai Kohei * contain xid/ino, it's necessary to verify once while mounting process. 4249fe4854cSDavid Woodhouse * save_xattr_ref(c, ref) 4258a13695cSKaiGai Kohei * is used to write xref to medium. If delete marker is marked, it write 4268a13695cSKaiGai Kohei * a delete marker of xref into medium. 4279fe4854cSDavid Woodhouse * create_xattr_ref(c, ic, xd) 428aa98d7cfSKaiGai Kohei * is used to create a new xref and write to medium. 4298a13695cSKaiGai Kohei * delete_xattr_ref(c, ref) 4308a13695cSKaiGai Kohei * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 4318a13695cSKaiGai Kohei * and allows GC to reclaim those physical nodes. 432aa98d7cfSKaiGai Kohei * jffs2_xattr_delete_inode(c, ic) 433aa98d7cfSKaiGai Kohei * is called to remove xrefs related to obsolete inode when inode is unlinked. 434aa98d7cfSKaiGai Kohei * jffs2_xattr_free_inode(c, ic) 435aa98d7cfSKaiGai Kohei * is called to release xattr related objects when unmounting. 4368f2b6f49SKaiGai Kohei * check_xattr_ref_inode(c, ic) 437aa98d7cfSKaiGai Kohei * is used to confirm inode does not have duplicate xattr name/value pair. 438aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 439aa98d7cfSKaiGai Kohei static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 440aa98d7cfSKaiGai Kohei { 441aa98d7cfSKaiGai Kohei struct jffs2_eraseblock *jeb; 442c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 443aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 444aa98d7cfSKaiGai Kohei size_t readlen; 445c9f700f8SKaiGai Kohei uint32_t crc, offset, totlen; 446aa98d7cfSKaiGai Kohei int rc; 447aa98d7cfSKaiGai Kohei 448c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 449c9f700f8SKaiGai Kohei if (ref_flags(ref->node) != REF_UNCHECKED) 450c9f700f8SKaiGai Kohei goto complete; 451c9f700f8SKaiGai Kohei offset = ref_offset(ref->node); 452c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 453aa98d7cfSKaiGai Kohei 454c9f700f8SKaiGai Kohei rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 455aa98d7cfSKaiGai Kohei if (rc || sizeof(rr) != readlen) { 45689291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 457c9f700f8SKaiGai Kohei rc, sizeof(rr), readlen, offset); 458aa98d7cfSKaiGai Kohei return rc ? rc : -EIO; 459aa98d7cfSKaiGai Kohei } 460aa98d7cfSKaiGai Kohei /* obsolete node */ 461aa98d7cfSKaiGai Kohei crc = crc32(0, &rr, sizeof(rr) - 4); 462aa98d7cfSKaiGai Kohei if (crc != je32_to_cpu(rr.node_crc)) { 463aa98d7cfSKaiGai Kohei JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 464c9f700f8SKaiGai Kohei offset, je32_to_cpu(rr.node_crc), crc); 465f326966bSVasiliy Kulikov return -EIO; 466aa98d7cfSKaiGai Kohei } 467aa98d7cfSKaiGai Kohei if (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 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 47189291a9dSDavid Woodhouse "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 472c9f700f8SKaiGai Kohei offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 473aa98d7cfSKaiGai Kohei je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 474aa98d7cfSKaiGai Kohei je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 475f326966bSVasiliy Kulikov return -EIO; 476aa98d7cfSKaiGai Kohei } 477aa98d7cfSKaiGai Kohei ref->ino = je32_to_cpu(rr.ino); 478aa98d7cfSKaiGai Kohei ref->xid = je32_to_cpu(rr.xid); 479c9f700f8SKaiGai Kohei ref->xseqno = je32_to_cpu(rr.xseqno); 480c9f700f8SKaiGai Kohei if (ref->xseqno > c->highest_xseqno) 481c9f700f8SKaiGai Kohei c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 482aa98d7cfSKaiGai Kohei 483aa98d7cfSKaiGai Kohei spin_lock(&c->erase_completion_lock); 484c9f700f8SKaiGai Kohei complete: 485c9f700f8SKaiGai Kohei for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 486c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 487c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 488c9f700f8SKaiGai Kohei if (ref_flags(raw) == REF_UNCHECKED) { 489aa98d7cfSKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 490aa98d7cfSKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 491c9f700f8SKaiGai Kohei } 492c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 493c9f700f8SKaiGai Kohei } 494aa98d7cfSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 495aa98d7cfSKaiGai Kohei 496aa98d7cfSKaiGai Kohei dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 497aa98d7cfSKaiGai Kohei ref->ino, ref->xid, ref_offset(ref->node)); 498aa98d7cfSKaiGai Kohei return 0; 499aa98d7cfSKaiGai Kohei } 500aa98d7cfSKaiGai Kohei 5019fe4854cSDavid Woodhouse static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 502aa98d7cfSKaiGai Kohei { 503aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 504aa98d7cfSKaiGai Kohei struct jffs2_raw_xref rr; 50589291a9dSDavid Woodhouse size_t length; 506c9f700f8SKaiGai Kohei uint32_t xseqno, phys_ofs = write_ofs(c); 507aa98d7cfSKaiGai Kohei int ret; 508aa98d7cfSKaiGai Kohei 509aa98d7cfSKaiGai Kohei rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 510aa98d7cfSKaiGai Kohei rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 511aa98d7cfSKaiGai Kohei rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 512aa98d7cfSKaiGai Kohei rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 513aa98d7cfSKaiGai Kohei 514c9f700f8SKaiGai Kohei xseqno = (c->highest_xseqno += 2); 515c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 516c9f700f8SKaiGai Kohei xseqno |= XREF_DELETE_MARKER; 517c9f700f8SKaiGai Kohei rr.ino = cpu_to_je32(ref->ino); 518c9f700f8SKaiGai Kohei rr.xid = cpu_to_je32(ref->xid); 519c9f700f8SKaiGai Kohei } else { 520aa98d7cfSKaiGai Kohei rr.ino = cpu_to_je32(ref->ic->ino); 521aa98d7cfSKaiGai Kohei rr.xid = cpu_to_je32(ref->xd->xid); 522c9f700f8SKaiGai Kohei } 523c9f700f8SKaiGai Kohei rr.xseqno = cpu_to_je32(xseqno); 524aa98d7cfSKaiGai Kohei rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 525aa98d7cfSKaiGai Kohei 526aa98d7cfSKaiGai Kohei ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 527aa98d7cfSKaiGai Kohei if (ret || sizeof(rr) != length) { 52889291a9dSDavid Woodhouse JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 529aa98d7cfSKaiGai Kohei ret, sizeof(rr), length, phys_ofs); 530aa98d7cfSKaiGai Kohei ret = ret ? ret : -EIO; 5312f785402SDavid Woodhouse if (length) 5322f785402SDavid Woodhouse jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 5332f785402SDavid Woodhouse 534aa98d7cfSKaiGai Kohei return ret; 535aa98d7cfSKaiGai Kohei } 536c9f700f8SKaiGai Kohei /* success */ 537c9f700f8SKaiGai Kohei ref->xseqno = xseqno; 538c9f700f8SKaiGai Kohei jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 539aa98d7cfSKaiGai Kohei 540aa98d7cfSKaiGai Kohei dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 541aa98d7cfSKaiGai Kohei 542aa98d7cfSKaiGai Kohei return 0; 543aa98d7cfSKaiGai Kohei } 544aa98d7cfSKaiGai Kohei 545aa98d7cfSKaiGai Kohei static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 5469fe4854cSDavid Woodhouse struct jffs2_xattr_datum *xd) 547aa98d7cfSKaiGai Kohei { 548aa98d7cfSKaiGai Kohei /* must be called under down_write(xattr_sem) */ 549aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref; 550aa98d7cfSKaiGai Kohei int ret; 551aa98d7cfSKaiGai Kohei 552aa98d7cfSKaiGai Kohei ref = jffs2_alloc_xattr_ref(); 553aa98d7cfSKaiGai Kohei if (!ref) 554aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 555aa98d7cfSKaiGai Kohei ref->ic = ic; 556aa98d7cfSKaiGai Kohei ref->xd = xd; 557aa98d7cfSKaiGai Kohei 5589fe4854cSDavid Woodhouse ret = save_xattr_ref(c, ref); 559aa98d7cfSKaiGai Kohei if (ret) { 560aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 561aa98d7cfSKaiGai Kohei return ERR_PTR(ret); 562aa98d7cfSKaiGai Kohei } 563aa98d7cfSKaiGai Kohei 564aa98d7cfSKaiGai Kohei /* Chain to inode */ 5658f2b6f49SKaiGai Kohei ref->next = ic->xref; 5668f2b6f49SKaiGai Kohei ic->xref = ref; 567aa98d7cfSKaiGai Kohei 568aa98d7cfSKaiGai Kohei return ref; /* success */ 569aa98d7cfSKaiGai Kohei } 570aa98d7cfSKaiGai Kohei 5718a13695cSKaiGai Kohei static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 572c9f700f8SKaiGai Kohei { 573c9f700f8SKaiGai Kohei /* must be called under down_write(xattr_sem) */ 574c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 575c9f700f8SKaiGai Kohei 576c9f700f8SKaiGai Kohei xd = ref->xd; 5778a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 578c9f700f8SKaiGai Kohei ref->ino = ref->ic->ino; 579c9f700f8SKaiGai Kohei ref->xid = ref->xd->xid; 580c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 581c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 582c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 583c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 584c9f700f8SKaiGai Kohei 5858a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 5868a13695cSKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 587c9f700f8SKaiGai Kohei 588c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 589c9f700f8SKaiGai Kohei } 590c9f700f8SKaiGai Kohei 591aa98d7cfSKaiGai Kohei void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 592aa98d7cfSKaiGai Kohei { 593b57922d9SAl Viro /* It's called from jffs2_evict_inode() on inode removing. 594aa98d7cfSKaiGai Kohei When an inode with XATTR is removed, those XATTRs must be removed. */ 5958a13695cSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 596aa98d7cfSKaiGai Kohei 59727c72b04SDavid Woodhouse if (!ic || ic->pino_nlink > 0) 598aa98d7cfSKaiGai Kohei return; 599aa98d7cfSKaiGai Kohei 600c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 6018a13695cSKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 6028a13695cSKaiGai Kohei _ref = ref->next; 6038a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 604c9f700f8SKaiGai Kohei } 6058a13695cSKaiGai Kohei ic->xref = NULL; 606aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 607aa98d7cfSKaiGai Kohei } 608aa98d7cfSKaiGai Kohei 609aa98d7cfSKaiGai Kohei void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 610aa98d7cfSKaiGai Kohei { 611aa98d7cfSKaiGai Kohei /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 612aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 613aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 614aa98d7cfSKaiGai Kohei 615aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 6168f2b6f49SKaiGai Kohei for (ref = ic->xref; ref; ref = _ref) { 6178f2b6f49SKaiGai Kohei _ref = ref->next; 618aa98d7cfSKaiGai Kohei xd = ref->xd; 6192c887e23SKaiGai Kohei if (atomic_dec_and_test(&xd->refcnt)) { 620aa98d7cfSKaiGai Kohei unload_xattr_datum(c, xd); 621aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 622aa98d7cfSKaiGai Kohei } 623aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 624aa98d7cfSKaiGai Kohei } 6258f2b6f49SKaiGai Kohei ic->xref = NULL; 626aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 627aa98d7cfSKaiGai Kohei } 628aa98d7cfSKaiGai Kohei 6298f2b6f49SKaiGai Kohei static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 630aa98d7cfSKaiGai Kohei { 631a4ce96acSLinus Torvalds /* success of check_xattr_ref_inode() means that inode (ic) dose not have 632aa98d7cfSKaiGai Kohei * duplicate name/value pairs. If duplicate name/value pair would be found, 633aa98d7cfSKaiGai Kohei * one will be removed. 634aa98d7cfSKaiGai Kohei */ 635c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 636aa98d7cfSKaiGai Kohei int rc = 0; 637aa98d7cfSKaiGai Kohei 638aa98d7cfSKaiGai Kohei if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 639aa98d7cfSKaiGai Kohei return 0; 640aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 641aa98d7cfSKaiGai Kohei retry: 642aa98d7cfSKaiGai Kohei rc = 0; 6438f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 644aa98d7cfSKaiGai Kohei if (!ref->xd->xname) { 645aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, ref->xd); 646aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 6478f2b6f49SKaiGai Kohei *pref = ref->next; 6488a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 649aa98d7cfSKaiGai Kohei goto retry; 650aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 651aa98d7cfSKaiGai Kohei goto out; 652aa98d7cfSKaiGai Kohei } 653c9f700f8SKaiGai Kohei for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 654aa98d7cfSKaiGai Kohei if (!cmp->xd->xname) { 655aa98d7cfSKaiGai Kohei ref->xd->flags |= JFFS2_XFLAGS_BIND; 656aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, cmp->xd); 657aa98d7cfSKaiGai Kohei ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 658aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 659c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6608a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 661aa98d7cfSKaiGai Kohei goto retry; 662aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 663aa98d7cfSKaiGai Kohei goto out; 664aa98d7cfSKaiGai Kohei } 665aa98d7cfSKaiGai Kohei if (ref->xd->xprefix == cmp->xd->xprefix 666aa98d7cfSKaiGai Kohei && !strcmp(ref->xd->xname, cmp->xd->xname)) { 667c9f700f8SKaiGai Kohei if (ref->xseqno > cmp->xseqno) { 668c9f700f8SKaiGai Kohei *pcmp = cmp->next; 6698a13695cSKaiGai Kohei delete_xattr_ref(c, cmp); 670c9f700f8SKaiGai Kohei } else { 671c9f700f8SKaiGai Kohei *pref = ref->next; 6728a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 673c9f700f8SKaiGai Kohei } 674aa98d7cfSKaiGai Kohei goto retry; 675aa98d7cfSKaiGai Kohei } 676aa98d7cfSKaiGai Kohei } 677aa98d7cfSKaiGai Kohei } 678aa98d7cfSKaiGai Kohei ic->flags |= INO_FLAGS_XATTR_CHECKED; 679aa98d7cfSKaiGai Kohei out: 680aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 681aa98d7cfSKaiGai Kohei 682aa98d7cfSKaiGai Kohei return rc; 683aa98d7cfSKaiGai Kohei } 684aa98d7cfSKaiGai Kohei 685aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 686aa98d7cfSKaiGai Kohei * jffs2_init_xattr_subsystem(c) 687aa98d7cfSKaiGai Kohei * is used to initialize semaphore and list_head, and some variables. 688aa98d7cfSKaiGai Kohei * jffs2_find_xattr_datum(c, xid) 689aa98d7cfSKaiGai Kohei * is used to lookup xdatum while scanning process. 690aa98d7cfSKaiGai Kohei * jffs2_clear_xattr_subsystem(c) 691aa98d7cfSKaiGai Kohei * is used to release any xattr related objects. 692aa98d7cfSKaiGai Kohei * jffs2_build_xattr_subsystem(c) 693aa98d7cfSKaiGai Kohei * is used to associate xdatum and xref while super block building process. 694aa98d7cfSKaiGai Kohei * jffs2_setup_xattr_datum(c, xid, version) 695aa98d7cfSKaiGai Kohei * is used to insert xdatum while scanning process. 696aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 697aa98d7cfSKaiGai Kohei void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 698aa98d7cfSKaiGai Kohei { 699aa98d7cfSKaiGai Kohei int i; 700aa98d7cfSKaiGai Kohei 701aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) 702aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattrindex[i]); 703aa98d7cfSKaiGai Kohei INIT_LIST_HEAD(&c->xattr_unchecked); 704c9f700f8SKaiGai Kohei INIT_LIST_HEAD(&c->xattr_dead_list); 705c9f700f8SKaiGai Kohei c->xref_dead_list = NULL; 7068f2b6f49SKaiGai Kohei c->xref_temp = NULL; 707aa98d7cfSKaiGai Kohei 708aa98d7cfSKaiGai Kohei init_rwsem(&c->xattr_sem); 709c9f700f8SKaiGai Kohei c->highest_xid = 0; 710c9f700f8SKaiGai Kohei c->highest_xseqno = 0; 711aa98d7cfSKaiGai Kohei c->xdatum_mem_usage = 0; 712aa98d7cfSKaiGai Kohei c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 713aa98d7cfSKaiGai Kohei } 714aa98d7cfSKaiGai Kohei 715aa98d7cfSKaiGai Kohei static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 716aa98d7cfSKaiGai Kohei { 717aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 718aa98d7cfSKaiGai Kohei int i = xid % XATTRINDEX_HASHSIZE; 719aa98d7cfSKaiGai Kohei 720aa98d7cfSKaiGai Kohei /* It's only used in scanning/building process. */ 721aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 722aa98d7cfSKaiGai Kohei 723aa98d7cfSKaiGai Kohei list_for_each_entry(xd, &c->xattrindex[i], xindex) { 724aa98d7cfSKaiGai Kohei if (xd->xid==xid) 725aa98d7cfSKaiGai Kohei return xd; 726aa98d7cfSKaiGai Kohei } 727aa98d7cfSKaiGai Kohei return NULL; 728aa98d7cfSKaiGai Kohei } 729aa98d7cfSKaiGai Kohei 730aa98d7cfSKaiGai Kohei void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 731aa98d7cfSKaiGai Kohei { 732aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 733aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 734aa98d7cfSKaiGai Kohei int i; 735aa98d7cfSKaiGai Kohei 7368f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref = _ref) { 7378f2b6f49SKaiGai Kohei _ref = ref->next; 738aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 7398f2b6f49SKaiGai Kohei } 740c9f700f8SKaiGai Kohei 741c9f700f8SKaiGai Kohei for (ref=c->xref_dead_list; ref; ref = _ref) { 742c9f700f8SKaiGai Kohei _ref = ref->next; 743c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 744c9f700f8SKaiGai Kohei } 745aa98d7cfSKaiGai Kohei 746aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 747aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 748aa98d7cfSKaiGai Kohei list_del(&xd->xindex); 749aa98d7cfSKaiGai Kohei if (xd->xname) 750aa98d7cfSKaiGai Kohei kfree(xd->xname); 751aa98d7cfSKaiGai Kohei jffs2_free_xattr_datum(xd); 752aa98d7cfSKaiGai Kohei } 753aa98d7cfSKaiGai Kohei } 754c9f700f8SKaiGai Kohei 755c9f700f8SKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 756c9f700f8SKaiGai Kohei list_del(&xd->xindex); 757c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 758c9f700f8SKaiGai Kohei } 7592ad8ee71SDavid Woodhouse list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 7602ad8ee71SDavid Woodhouse list_del(&xd->xindex); 7612ad8ee71SDavid Woodhouse jffs2_free_xattr_datum(xd); 7622ad8ee71SDavid Woodhouse } 763aa98d7cfSKaiGai Kohei } 764aa98d7cfSKaiGai Kohei 765c9f700f8SKaiGai Kohei #define XREF_TMPHASH_SIZE (128) 766aa98d7cfSKaiGai Kohei void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 767aa98d7cfSKaiGai Kohei { 768aa98d7cfSKaiGai Kohei struct jffs2_xattr_ref *ref, *_ref; 769c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; 770aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 771aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic; 772c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 773aa98d7cfSKaiGai Kohei int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 7748a13695cSKaiGai Kohei int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 775aa98d7cfSKaiGai Kohei 776aa98d7cfSKaiGai Kohei BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 777aa98d7cfSKaiGai Kohei 7788a13695cSKaiGai Kohei /* Phase.1 : Merge same xref */ 779c9f700f8SKaiGai Kohei for (i=0; i < XREF_TMPHASH_SIZE; i++) 780c9f700f8SKaiGai Kohei xref_tmphash[i] = NULL; 7818f2b6f49SKaiGai Kohei for (ref=c->xref_temp; ref; ref=_ref) { 782c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp; 783c9f700f8SKaiGai Kohei 7848f2b6f49SKaiGai Kohei _ref = ref->next; 785aa98d7cfSKaiGai Kohei if (ref_flags(ref->node) != REF_PRISTINE) { 786aa98d7cfSKaiGai Kohei if (verify_xattr_ref(c, ref)) { 787c9f700f8SKaiGai Kohei BUG_ON(ref->node->next_in_ino != (void *)ref); 788c9f700f8SKaiGai Kohei ref->node->next_in_ino = NULL; 789c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, ref->node); 790aa98d7cfSKaiGai Kohei jffs2_free_xattr_ref(ref); 791aa98d7cfSKaiGai Kohei continue; 792aa98d7cfSKaiGai Kohei } 793aa98d7cfSKaiGai Kohei } 794c9f700f8SKaiGai Kohei 795c9f700f8SKaiGai Kohei i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 796c9f700f8SKaiGai Kohei for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 797c9f700f8SKaiGai Kohei if (tmp->ino == ref->ino && tmp->xid == ref->xid) 798c9f700f8SKaiGai Kohei break; 799c9f700f8SKaiGai Kohei } 800c9f700f8SKaiGai Kohei if (tmp) { 801c9f700f8SKaiGai Kohei raw = ref->node; 802c9f700f8SKaiGai Kohei if (ref->xseqno > tmp->xseqno) { 803c9f700f8SKaiGai Kohei tmp->xseqno = ref->xseqno; 804c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node; 805c9f700f8SKaiGai Kohei tmp->node = raw; 806c9f700f8SKaiGai Kohei } else { 807c9f700f8SKaiGai Kohei raw->next_in_ino = tmp->node->next_in_ino; 808c9f700f8SKaiGai Kohei tmp->node->next_in_ino = raw; 809c9f700f8SKaiGai Kohei } 810c9f700f8SKaiGai Kohei jffs2_free_xattr_ref(ref); 811c9f700f8SKaiGai Kohei continue; 812c9f700f8SKaiGai Kohei } else { 813c9f700f8SKaiGai Kohei ref->next = xref_tmphash[i]; 814c9f700f8SKaiGai Kohei xref_tmphash[i] = ref; 815c9f700f8SKaiGai Kohei } 816c9f700f8SKaiGai Kohei } 817c9f700f8SKaiGai Kohei c->xref_temp = NULL; 818c9f700f8SKaiGai Kohei 8198a13695cSKaiGai Kohei /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 820c9f700f8SKaiGai Kohei for (i=0; i < XREF_TMPHASH_SIZE; i++) { 821c9f700f8SKaiGai Kohei for (ref=xref_tmphash[i]; ref; ref=_ref) { 8228a13695cSKaiGai Kohei xref_count++; 823c9f700f8SKaiGai Kohei _ref = ref->next; 824c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref)) { 825c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 826c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8278a13695cSKaiGai Kohei xref_dead_count++; 828c9f700f8SKaiGai Kohei continue; 829c9f700f8SKaiGai Kohei } 830aa98d7cfSKaiGai Kohei /* At this point, ref->xid and ref->ino contain XID and inode number. 831aa98d7cfSKaiGai Kohei ref->xd and ref->ic are not valid yet. */ 832aa98d7cfSKaiGai Kohei xd = jffs2_find_xattr_datum(c, ref->xid); 833aa98d7cfSKaiGai Kohei ic = jffs2_get_ino_cache(c, ref->ino); 83427c72b04SDavid Woodhouse if (!xd || !ic || !ic->pino_nlink) { 8358a13695cSKaiGai Kohei dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 836c9f700f8SKaiGai Kohei ref->ino, ref->xid, ref->xseqno); 8378a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 838c9f700f8SKaiGai Kohei ref->next = c->xref_dead_list; 839c9f700f8SKaiGai Kohei c->xref_dead_list = ref; 8408a13695cSKaiGai Kohei xref_orphan_count++; 841aa98d7cfSKaiGai Kohei continue; 842aa98d7cfSKaiGai Kohei } 843aa98d7cfSKaiGai Kohei ref->xd = xd; 844aa98d7cfSKaiGai Kohei ref->ic = ic; 8452c887e23SKaiGai Kohei atomic_inc(&xd->refcnt); 8468f2b6f49SKaiGai Kohei ref->next = ic->xref; 8478f2b6f49SKaiGai Kohei ic->xref = ref; 848aa98d7cfSKaiGai Kohei } 849c9f700f8SKaiGai Kohei } 850aa98d7cfSKaiGai Kohei 8518a13695cSKaiGai Kohei /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 852aa98d7cfSKaiGai Kohei for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 853aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 8548a13695cSKaiGai Kohei xdatum_count++; 855aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 8562c887e23SKaiGai Kohei if (!atomic_read(&xd->refcnt)) { 8578a13695cSKaiGai Kohei dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 858c9f700f8SKaiGai Kohei xd->xid, xd->version); 8598a13695cSKaiGai Kohei xd->flags |= JFFS2_XFLAGS_DEAD; 860c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 8618a13695cSKaiGai Kohei xdatum_orphan_count++; 862aa98d7cfSKaiGai Kohei continue; 863aa98d7cfSKaiGai Kohei } 864c9f700f8SKaiGai Kohei if (is_xattr_datum_unchecked(c, xd)) { 865c9f700f8SKaiGai Kohei dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 866c9f700f8SKaiGai Kohei xd->xid, xd->version); 867aa98d7cfSKaiGai Kohei list_add(&xd->xindex, &c->xattr_unchecked); 868aa98d7cfSKaiGai Kohei xdatum_unchecked_count++; 869aa98d7cfSKaiGai Kohei } 870aa98d7cfSKaiGai Kohei } 871aa98d7cfSKaiGai Kohei } 872aa98d7cfSKaiGai Kohei /* build complete */ 8738a13695cSKaiGai Kohei JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 8748a13695cSKaiGai Kohei " (%u unchecked, %u orphan) and " 8758a13695cSKaiGai Kohei "%u of xref (%u dead, %u orphan) found.\n", 8768a13695cSKaiGai Kohei xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 8778a13695cSKaiGai Kohei xref_count, xref_dead_count, xref_orphan_count); 878aa98d7cfSKaiGai Kohei } 879aa98d7cfSKaiGai Kohei 880aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 881aa98d7cfSKaiGai Kohei uint32_t xid, uint32_t version) 882aa98d7cfSKaiGai Kohei { 883c9f700f8SKaiGai Kohei struct jffs2_xattr_datum *xd; 884aa98d7cfSKaiGai Kohei 885c9f700f8SKaiGai Kohei xd = jffs2_find_xattr_datum(c, xid); 886c9f700f8SKaiGai Kohei if (!xd) { 887aa98d7cfSKaiGai Kohei xd = jffs2_alloc_xattr_datum(); 888aa98d7cfSKaiGai Kohei if (!xd) 889aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 890aa98d7cfSKaiGai Kohei xd->xid = xid; 891aa98d7cfSKaiGai Kohei xd->version = version; 892aa98d7cfSKaiGai Kohei if (xd->xid > c->highest_xid) 893aa98d7cfSKaiGai Kohei c->highest_xid = xd->xid; 894aa98d7cfSKaiGai Kohei list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 895aa98d7cfSKaiGai Kohei } 896aa98d7cfSKaiGai Kohei return xd; 897aa98d7cfSKaiGai Kohei } 898aa98d7cfSKaiGai Kohei 899aa98d7cfSKaiGai Kohei /* -------- xattr subsystem functions --------------- 900aa98d7cfSKaiGai Kohei * xprefix_to_handler(xprefix) 901aa98d7cfSKaiGai Kohei * is used to translate xprefix into xattr_handler. 902aa98d7cfSKaiGai Kohei * jffs2_listxattr(dentry, buffer, size) 903aa98d7cfSKaiGai Kohei * is an implementation of listxattr handler on jffs2. 904aa98d7cfSKaiGai Kohei * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 905aa98d7cfSKaiGai Kohei * is an implementation of getxattr handler on jffs2. 906aa98d7cfSKaiGai Kohei * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 907aa98d7cfSKaiGai Kohei * is an implementation of setxattr handler on jffs2. 908aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 909365f0cb9SStephen Hemminger const struct xattr_handler *jffs2_xattr_handlers[] = { 910aa98d7cfSKaiGai Kohei &jffs2_user_xattr_handler, 911aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 912aa98d7cfSKaiGai Kohei &jffs2_security_xattr_handler, 913aa98d7cfSKaiGai Kohei #endif 914aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 915aa98d7cfSKaiGai Kohei &jffs2_acl_access_xattr_handler, 916aa98d7cfSKaiGai Kohei &jffs2_acl_default_xattr_handler, 917aa98d7cfSKaiGai Kohei #endif 918aa98d7cfSKaiGai Kohei &jffs2_trusted_xattr_handler, 919aa98d7cfSKaiGai Kohei NULL 920aa98d7cfSKaiGai Kohei }; 921aa98d7cfSKaiGai Kohei 922365f0cb9SStephen Hemminger static const struct xattr_handler *xprefix_to_handler(int xprefix) { 923365f0cb9SStephen Hemminger const struct xattr_handler *ret; 924aa98d7cfSKaiGai Kohei 925aa98d7cfSKaiGai Kohei switch (xprefix) { 926aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_USER: 927aa98d7cfSKaiGai Kohei ret = &jffs2_user_xattr_handler; 928aa98d7cfSKaiGai Kohei break; 929aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_SECURITY 930aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_SECURITY: 931aa98d7cfSKaiGai Kohei ret = &jffs2_security_xattr_handler; 932aa98d7cfSKaiGai Kohei break; 933aa98d7cfSKaiGai Kohei #endif 934aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 935aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_ACCESS: 936aa98d7cfSKaiGai Kohei ret = &jffs2_acl_access_xattr_handler; 937aa98d7cfSKaiGai Kohei break; 938aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_ACL_DEFAULT: 939aa98d7cfSKaiGai Kohei ret = &jffs2_acl_default_xattr_handler; 940aa98d7cfSKaiGai Kohei break; 941aa98d7cfSKaiGai Kohei #endif 942aa98d7cfSKaiGai Kohei case JFFS2_XPREFIX_TRUSTED: 943aa98d7cfSKaiGai Kohei ret = &jffs2_trusted_xattr_handler; 944aa98d7cfSKaiGai Kohei break; 945aa98d7cfSKaiGai Kohei default: 946aa98d7cfSKaiGai Kohei ret = NULL; 947aa98d7cfSKaiGai Kohei break; 948aa98d7cfSKaiGai Kohei } 949aa98d7cfSKaiGai Kohei return ret; 950aa98d7cfSKaiGai Kohei } 951aa98d7cfSKaiGai Kohei 952aa98d7cfSKaiGai Kohei ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 953aa98d7cfSKaiGai Kohei { 954aa98d7cfSKaiGai Kohei struct inode *inode = dentry->d_inode; 955aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 956aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 957aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 9588f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 959aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 960365f0cb9SStephen Hemminger const struct xattr_handler *xhandle; 961aa98d7cfSKaiGai Kohei ssize_t len, rc; 962aa98d7cfSKaiGai Kohei int retry = 0; 963aa98d7cfSKaiGai Kohei 9648f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 965aa98d7cfSKaiGai Kohei if (unlikely(rc)) 966aa98d7cfSKaiGai Kohei return rc; 967aa98d7cfSKaiGai Kohei 968aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 969aa98d7cfSKaiGai Kohei retry: 970aa98d7cfSKaiGai Kohei len = 0; 9718f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 972aa98d7cfSKaiGai Kohei BUG_ON(ref->ic != ic); 973aa98d7cfSKaiGai Kohei xd = ref->xd; 974aa98d7cfSKaiGai Kohei if (!xd->xname) { 975aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 976aa98d7cfSKaiGai Kohei if (!retry) { 977aa98d7cfSKaiGai Kohei retry = 1; 978aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 979aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 980aa98d7cfSKaiGai Kohei goto retry; 981aa98d7cfSKaiGai Kohei } else { 982aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 983aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 9848f2b6f49SKaiGai Kohei *pref = ref->next; 9858a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 986aa98d7cfSKaiGai Kohei goto retry; 987aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 988aa98d7cfSKaiGai Kohei goto out; 989aa98d7cfSKaiGai Kohei } 990aa98d7cfSKaiGai Kohei } 991aa98d7cfSKaiGai Kohei xhandle = xprefix_to_handler(xd->xprefix); 992aa98d7cfSKaiGai Kohei if (!xhandle) 993aa98d7cfSKaiGai Kohei continue; 994aa98d7cfSKaiGai Kohei if (buffer) { 995431547b3SChristoph Hellwig rc = xhandle->list(dentry, buffer+len, size-len, 996431547b3SChristoph Hellwig xd->xname, xd->name_len, xd->flags); 997aa98d7cfSKaiGai Kohei } else { 998431547b3SChristoph Hellwig rc = xhandle->list(dentry, NULL, 0, xd->xname, 999431547b3SChristoph Hellwig xd->name_len, xd->flags); 1000aa98d7cfSKaiGai Kohei } 1001aa98d7cfSKaiGai Kohei if (rc < 0) 1002aa98d7cfSKaiGai Kohei goto out; 1003aa98d7cfSKaiGai Kohei len += rc; 1004aa98d7cfSKaiGai Kohei } 1005aa98d7cfSKaiGai Kohei rc = len; 1006aa98d7cfSKaiGai Kohei out: 1007aa98d7cfSKaiGai Kohei if (!retry) { 1008aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1009aa98d7cfSKaiGai Kohei } else { 1010aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1011aa98d7cfSKaiGai Kohei } 1012aa98d7cfSKaiGai Kohei return rc; 1013aa98d7cfSKaiGai Kohei } 1014aa98d7cfSKaiGai Kohei 1015aa98d7cfSKaiGai Kohei int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1016aa98d7cfSKaiGai Kohei char *buffer, size_t size) 1017aa98d7cfSKaiGai Kohei { 1018aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1019aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1020aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1021aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 10228f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, **pref; 1023aa98d7cfSKaiGai Kohei int rc, retry = 0; 1024aa98d7cfSKaiGai Kohei 10258f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1026aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1027aa98d7cfSKaiGai Kohei return rc; 1028aa98d7cfSKaiGai Kohei 1029aa98d7cfSKaiGai Kohei down_read(&c->xattr_sem); 1030aa98d7cfSKaiGai Kohei retry: 10318f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1032aa98d7cfSKaiGai Kohei BUG_ON(ref->ic!=ic); 1033aa98d7cfSKaiGai Kohei 1034aa98d7cfSKaiGai Kohei xd = ref->xd; 1035aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1036aa98d7cfSKaiGai Kohei continue; 1037aa98d7cfSKaiGai Kohei if (!xd->xname) { 1038aa98d7cfSKaiGai Kohei /* xdatum is unchached */ 1039aa98d7cfSKaiGai Kohei if (!retry) { 1040aa98d7cfSKaiGai Kohei retry = 1; 1041aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1042aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1043aa98d7cfSKaiGai Kohei goto retry; 1044aa98d7cfSKaiGai Kohei } else { 1045aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1046aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 10478f2b6f49SKaiGai Kohei *pref = ref->next; 10488a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1049aa98d7cfSKaiGai Kohei goto retry; 1050aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) { 1051aa98d7cfSKaiGai Kohei goto out; 1052aa98d7cfSKaiGai Kohei } 1053aa98d7cfSKaiGai Kohei } 1054aa98d7cfSKaiGai Kohei } 1055aa98d7cfSKaiGai Kohei if (!strcmp(xname, xd->xname)) { 1056aa98d7cfSKaiGai Kohei rc = xd->value_len; 1057aa98d7cfSKaiGai Kohei if (buffer) { 1058aa98d7cfSKaiGai Kohei if (size < rc) { 1059aa98d7cfSKaiGai Kohei rc = -ERANGE; 1060aa98d7cfSKaiGai Kohei } else { 1061aa98d7cfSKaiGai Kohei memcpy(buffer, xd->xvalue, rc); 1062aa98d7cfSKaiGai Kohei } 1063aa98d7cfSKaiGai Kohei } 1064aa98d7cfSKaiGai Kohei goto out; 1065aa98d7cfSKaiGai Kohei } 1066aa98d7cfSKaiGai Kohei } 1067aa98d7cfSKaiGai Kohei rc = -ENODATA; 1068aa98d7cfSKaiGai Kohei out: 1069aa98d7cfSKaiGai Kohei if (!retry) { 1070aa98d7cfSKaiGai Kohei up_read(&c->xattr_sem); 1071aa98d7cfSKaiGai Kohei } else { 1072aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1073aa98d7cfSKaiGai Kohei } 1074aa98d7cfSKaiGai Kohei return rc; 1075aa98d7cfSKaiGai Kohei } 1076aa98d7cfSKaiGai Kohei 1077aa98d7cfSKaiGai Kohei int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1078aa98d7cfSKaiGai Kohei const char *buffer, size_t size, int flags) 1079aa98d7cfSKaiGai Kohei { 1080aa98d7cfSKaiGai Kohei struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1081aa98d7cfSKaiGai Kohei struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1082aa98d7cfSKaiGai Kohei struct jffs2_inode_cache *ic = f->inocache; 1083aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd; 10848f2b6f49SKaiGai Kohei struct jffs2_xattr_ref *ref, *newref, **pref; 10859fe4854cSDavid Woodhouse uint32_t length, request; 1086aa98d7cfSKaiGai Kohei int rc; 1087aa98d7cfSKaiGai Kohei 10888f2b6f49SKaiGai Kohei rc = check_xattr_ref_inode(c, ic); 1089aa98d7cfSKaiGai Kohei if (unlikely(rc)) 1090aa98d7cfSKaiGai Kohei return rc; 1091aa98d7cfSKaiGai Kohei 1092aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 10939fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1094aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1095aa98d7cfSKaiGai Kohei if (rc) { 1096aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1097aa98d7cfSKaiGai Kohei return rc; 1098aa98d7cfSKaiGai Kohei } 1099aa98d7cfSKaiGai Kohei 1100aa98d7cfSKaiGai Kohei /* Find existing xattr */ 1101aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1102aa98d7cfSKaiGai Kohei retry: 11038f2b6f49SKaiGai Kohei for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1104aa98d7cfSKaiGai Kohei xd = ref->xd; 1105aa98d7cfSKaiGai Kohei if (xd->xprefix != xprefix) 1106aa98d7cfSKaiGai Kohei continue; 1107aa98d7cfSKaiGai Kohei if (!xd->xname) { 1108aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 1109aa98d7cfSKaiGai Kohei if (unlikely(rc > 0)) { 11108f2b6f49SKaiGai Kohei *pref = ref->next; 11118a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1112aa98d7cfSKaiGai Kohei goto retry; 1113aa98d7cfSKaiGai Kohei } else if (unlikely(rc < 0)) 1114aa98d7cfSKaiGai Kohei goto out; 1115aa98d7cfSKaiGai Kohei } 1116aa98d7cfSKaiGai Kohei if (!strcmp(xd->xname, xname)) { 1117aa98d7cfSKaiGai Kohei if (flags & XATTR_CREATE) { 1118aa98d7cfSKaiGai Kohei rc = -EEXIST; 1119aa98d7cfSKaiGai Kohei goto out; 1120aa98d7cfSKaiGai Kohei } 1121aa98d7cfSKaiGai Kohei if (!buffer) { 11228a13695cSKaiGai Kohei ref->ino = ic->ino; 11238a13695cSKaiGai Kohei ref->xid = xd->xid; 11248a13695cSKaiGai Kohei ref->xseqno |= XREF_DELETE_MARKER; 11258a13695cSKaiGai Kohei rc = save_xattr_ref(c, ref); 11268a13695cSKaiGai Kohei if (!rc) { 11278f2b6f49SKaiGai Kohei *pref = ref->next; 11288a13695cSKaiGai Kohei spin_lock(&c->erase_completion_lock); 11298a13695cSKaiGai Kohei ref->next = c->xref_dead_list; 11308a13695cSKaiGai Kohei c->xref_dead_list = ref; 11318a13695cSKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1132c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 11338a13695cSKaiGai Kohei } else { 11348a13695cSKaiGai Kohei ref->ic = ic; 11358a13695cSKaiGai Kohei ref->xd = xd; 11368a13695cSKaiGai Kohei ref->xseqno &= ~XREF_DELETE_MARKER; 11378a13695cSKaiGai Kohei } 1138aa98d7cfSKaiGai Kohei goto out; 1139aa98d7cfSKaiGai Kohei } 1140aa98d7cfSKaiGai Kohei goto found; 1141aa98d7cfSKaiGai Kohei } 1142aa98d7cfSKaiGai Kohei } 1143aa98d7cfSKaiGai Kohei /* not found */ 1144aa98d7cfSKaiGai Kohei if (flags & XATTR_REPLACE) { 1145aa98d7cfSKaiGai Kohei rc = -ENODATA; 1146aa98d7cfSKaiGai Kohei goto out; 1147aa98d7cfSKaiGai Kohei } 1148aa98d7cfSKaiGai Kohei if (!buffer) { 1149c9f700f8SKaiGai Kohei rc = -ENODATA; 1150aa98d7cfSKaiGai Kohei goto out; 1151aa98d7cfSKaiGai Kohei } 1152aa98d7cfSKaiGai Kohei found: 11539fe4854cSDavid Woodhouse xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1154aa98d7cfSKaiGai Kohei if (IS_ERR(xd)) { 1155aa98d7cfSKaiGai Kohei rc = PTR_ERR(xd); 1156aa98d7cfSKaiGai Kohei goto out; 1157aa98d7cfSKaiGai Kohei } 1158aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1159aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1160aa98d7cfSKaiGai Kohei 1161aa98d7cfSKaiGai Kohei /* create xattr_ref */ 1162aa98d7cfSKaiGai Kohei request = PAD(sizeof(struct jffs2_raw_xref)); 11639fe4854cSDavid Woodhouse rc = jffs2_reserve_space(c, request, &length, 1164aa98d7cfSKaiGai Kohei ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1165c9f700f8SKaiGai Kohei down_write(&c->xattr_sem); 1166aa98d7cfSKaiGai Kohei if (rc) { 1167aa98d7cfSKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1168c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 1169aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1170aa98d7cfSKaiGai Kohei return rc; 1171aa98d7cfSKaiGai Kohei } 11728f2b6f49SKaiGai Kohei if (ref) 11738f2b6f49SKaiGai Kohei *pref = ref->next; 11749fe4854cSDavid Woodhouse newref = create_xattr_ref(c, ic, xd); 1175aa98d7cfSKaiGai Kohei if (IS_ERR(newref)) { 11768f2b6f49SKaiGai Kohei if (ref) { 11778f2b6f49SKaiGai Kohei ref->next = ic->xref; 11788f2b6f49SKaiGai Kohei ic->xref = ref; 11798f2b6f49SKaiGai Kohei } 1180aa98d7cfSKaiGai Kohei rc = PTR_ERR(newref); 1181c6e8c6ccSKaiGai Kohei unrefer_xattr_datum(c, xd); 1182aa98d7cfSKaiGai Kohei } else if (ref) { 11838a13695cSKaiGai Kohei delete_xattr_ref(c, ref); 1184aa98d7cfSKaiGai Kohei } 1185aa98d7cfSKaiGai Kohei out: 1186aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1187aa98d7cfSKaiGai Kohei jffs2_complete_reservation(c); 1188aa98d7cfSKaiGai Kohei return rc; 1189aa98d7cfSKaiGai Kohei } 1190aa98d7cfSKaiGai Kohei 1191aa98d7cfSKaiGai Kohei /* -------- garbage collector functions ------------- 1192c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1193aa98d7cfSKaiGai Kohei * is used to move xdatum into new node. 1194c9f700f8SKaiGai Kohei * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1195aa98d7cfSKaiGai Kohei * is used to move xref into new node. 1196aa98d7cfSKaiGai Kohei * jffs2_verify_xattr(c) 1197aa98d7cfSKaiGai Kohei * is used to call do_verify_xattr_datum() before garbage collecting. 11988a13695cSKaiGai Kohei * jffs2_release_xattr_datum(c, xd) 11998a13695cSKaiGai Kohei * is used to release an in-memory object of xdatum. 12008a13695cSKaiGai Kohei * jffs2_release_xattr_ref(c, ref) 12018a13695cSKaiGai Kohei * is used to release an in-memory object of xref. 1202aa98d7cfSKaiGai Kohei * -------------------------------------------------- */ 1203c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1204c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1205aa98d7cfSKaiGai Kohei { 12069fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1207c9f700f8SKaiGai Kohei int rc = 0; 1208aa98d7cfSKaiGai Kohei 1209084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1210c9f700f8SKaiGai Kohei if (xd->node != raw) 1211c9f700f8SKaiGai Kohei goto out; 12128a13695cSKaiGai Kohei if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1213c9f700f8SKaiGai Kohei goto out; 1214aa98d7cfSKaiGai Kohei 1215aa98d7cfSKaiGai Kohei rc = load_xattr_datum(c, xd); 12168a13695cSKaiGai Kohei if (unlikely(rc)) { 12178a13695cSKaiGai Kohei rc = (rc > 0) ? 0 : rc; 1218084702e0SKaiGai Kohei goto out; 1219aa98d7cfSKaiGai Kohei } 12208a13695cSKaiGai Kohei old_ofs = ref_offset(xd->node); 12218a13695cSKaiGai Kohei totlen = PAD(sizeof(struct jffs2_raw_xattr) 12228a13695cSKaiGai Kohei + xd->name_len + 1 + xd->value_len); 12239fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1224c9f700f8SKaiGai Kohei if (rc) { 1225c9f700f8SKaiGai Kohei JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1226084702e0SKaiGai Kohei goto out; 1227aa98d7cfSKaiGai Kohei } 12289fe4854cSDavid Woodhouse rc = save_xattr_datum(c, xd); 1229aa98d7cfSKaiGai Kohei if (!rc) 1230aa98d7cfSKaiGai Kohei dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1231aa98d7cfSKaiGai Kohei xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1232084702e0SKaiGai Kohei out: 1233c9f700f8SKaiGai Kohei if (!rc) 1234c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1235084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1236aa98d7cfSKaiGai Kohei return rc; 1237aa98d7cfSKaiGai Kohei } 1238aa98d7cfSKaiGai Kohei 1239c9f700f8SKaiGai Kohei int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1240c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw) 1241aa98d7cfSKaiGai Kohei { 12429fe4854cSDavid Woodhouse uint32_t totlen, length, old_ofs; 1243c9f700f8SKaiGai Kohei int rc = 0; 1244aa98d7cfSKaiGai Kohei 1245084702e0SKaiGai Kohei down_write(&c->xattr_sem); 1246aa98d7cfSKaiGai Kohei BUG_ON(!ref->node); 1247aa98d7cfSKaiGai Kohei 1248c9f700f8SKaiGai Kohei if (ref->node != raw) 1249c9f700f8SKaiGai Kohei goto out; 1250c9f700f8SKaiGai Kohei if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1251084702e0SKaiGai Kohei goto out; 1252084702e0SKaiGai Kohei 1253c9f700f8SKaiGai Kohei old_ofs = ref_offset(ref->node); 1254c9f700f8SKaiGai Kohei totlen = ref_totlen(c, c->gcblock, ref->node); 1255c9f700f8SKaiGai Kohei 12569fe4854cSDavid Woodhouse rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1257c9f700f8SKaiGai Kohei if (rc) { 1258c9f700f8SKaiGai Kohei JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 12598e24eea7SHarvey Harrison __func__, rc, totlen); 1260084702e0SKaiGai Kohei rc = rc ? rc : -EBADFD; 1261084702e0SKaiGai Kohei goto out; 1262aa98d7cfSKaiGai Kohei } 12639fe4854cSDavid Woodhouse rc = save_xattr_ref(c, ref); 1264aa98d7cfSKaiGai Kohei if (!rc) 1265aa98d7cfSKaiGai Kohei dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1266aa98d7cfSKaiGai Kohei ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1267084702e0SKaiGai Kohei out: 1268c9f700f8SKaiGai Kohei if (!rc) 1269c9f700f8SKaiGai Kohei jffs2_mark_node_obsolete(c, raw); 1270084702e0SKaiGai Kohei up_write(&c->xattr_sem); 1271aa98d7cfSKaiGai Kohei return rc; 1272aa98d7cfSKaiGai Kohei } 1273aa98d7cfSKaiGai Kohei 1274aa98d7cfSKaiGai Kohei int jffs2_verify_xattr(struct jffs2_sb_info *c) 1275aa98d7cfSKaiGai Kohei { 1276aa98d7cfSKaiGai Kohei struct jffs2_xattr_datum *xd, *_xd; 1277c9f700f8SKaiGai Kohei struct jffs2_eraseblock *jeb; 1278c9f700f8SKaiGai Kohei struct jffs2_raw_node_ref *raw; 1279c9f700f8SKaiGai Kohei uint32_t totlen; 1280aa98d7cfSKaiGai Kohei int rc; 1281aa98d7cfSKaiGai Kohei 1282aa98d7cfSKaiGai Kohei down_write(&c->xattr_sem); 1283aa98d7cfSKaiGai Kohei list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1284aa98d7cfSKaiGai Kohei rc = do_verify_xattr_datum(c, xd); 1285c9f700f8SKaiGai Kohei if (rc < 0) 1286c9f700f8SKaiGai Kohei continue; 1287aa98d7cfSKaiGai Kohei list_del_init(&xd->xindex); 1288c9f700f8SKaiGai Kohei spin_lock(&c->erase_completion_lock); 1289c9f700f8SKaiGai Kohei for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1290c9f700f8SKaiGai Kohei if (ref_flags(raw) != REF_UNCHECKED) 1291c9f700f8SKaiGai Kohei continue; 1292c9f700f8SKaiGai Kohei jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1293c9f700f8SKaiGai Kohei totlen = PAD(ref_totlen(c, jeb, raw)); 1294c9f700f8SKaiGai Kohei c->unchecked_size -= totlen; c->used_size += totlen; 1295c9f700f8SKaiGai Kohei jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1296c9f700f8SKaiGai Kohei raw->flash_offset = ref_offset(raw) 1297c9f700f8SKaiGai Kohei | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1298aa98d7cfSKaiGai Kohei } 12998a13695cSKaiGai Kohei if (xd->flags & JFFS2_XFLAGS_DEAD) 1300c9f700f8SKaiGai Kohei list_add(&xd->xindex, &c->xattr_dead_list); 1301c9f700f8SKaiGai Kohei spin_unlock(&c->erase_completion_lock); 1302aa98d7cfSKaiGai Kohei } 1303aa98d7cfSKaiGai Kohei up_write(&c->xattr_sem); 1304aa98d7cfSKaiGai Kohei return list_empty(&c->xattr_unchecked) ? 1 : 0; 1305aa98d7cfSKaiGai Kohei } 1306c9f700f8SKaiGai Kohei 1307c9f700f8SKaiGai Kohei void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1308c9f700f8SKaiGai Kohei { 1309c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 13102c887e23SKaiGai Kohei if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1311c9f700f8SKaiGai Kohei return; 1312c9f700f8SKaiGai Kohei 1313c9f700f8SKaiGai Kohei list_del(&xd->xindex); 1314c9f700f8SKaiGai Kohei jffs2_free_xattr_datum(xd); 1315c9f700f8SKaiGai Kohei } 1316c9f700f8SKaiGai Kohei 1317c9f700f8SKaiGai Kohei void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1318c9f700f8SKaiGai Kohei { 1319c9f700f8SKaiGai Kohei /* must be called under spin_lock(&c->erase_completion_lock) */ 1320c9f700f8SKaiGai Kohei struct jffs2_xattr_ref *tmp, **ptmp; 1321c9f700f8SKaiGai Kohei 1322c9f700f8SKaiGai Kohei if (ref->node != (void *)ref) 1323c9f700f8SKaiGai Kohei return; 1324c9f700f8SKaiGai Kohei 1325c9f700f8SKaiGai Kohei for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1326c9f700f8SKaiGai Kohei if (ref == tmp) { 1327c9f700f8SKaiGai Kohei *ptmp = tmp->next; 1328c9f700f8SKaiGai Kohei break; 1329c9f700f8SKaiGai Kohei } 1330c9f700f8SKaiGai Kohei } 13318a13695cSKaiGai Kohei jffs2_free_xattr_ref(ref); 1332c9f700f8SKaiGai Kohei } 1333