Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * JFFS2 -- Journalling Flash File System, Version 2.

 *

 * Copyright © 2006  NEC Corporation

 *

 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>

 *

 * For licensing information, see the file 'LICENCE' in this directory.

 *

 */

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/fs.h>

#include <linux/time.h>

#include <linux/pagemap.h>

#include <linux/highmem.h>

#include <linux/crc32.h>

#include <linux/jffs2.h>

#include <linux/xattr.h>

#include <linux/mtd/mtd.h>

#include "nodelist.h"

/* -------- xdatum related functions ----------------

 * xattr_datum_hashkey(xprefix, xname, xvalue, xsize)

 *   is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is

 *   the index of the xattr name/value pair cache (c->xattrindex).

 * is_xattr_datum_unchecked(c, xd)

 *   returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not

 *   unchecked, it returns 0.

 * unload_xattr_datum(c, xd)

 *   is used to release xattr name/value pair and detach from c->xattrindex.

 * reclaim_xattr_datum(c)

 *   is used to reclaim xattr name/value pairs on the xattr name/value pair cache when

 *   memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold

 *   is hard coded as 32KiB.

 * do_verify_xattr_datum(c, xd)

 *   is used to load the xdatum informations without name/value pair from the medium.

 *   It's necessary once, because those informations are not collected during mounting

 *   process when EBS is enabled.

 *   0 will be returned, if success. An negative return value means recoverable error, and

 *   positive return value means unrecoverable error. Thus, caller must remove this xdatum

 *   and xref when it returned positive value.

 * do_load_xattr_datum(c, xd)

 *   is used to load name/value pair from the medium.

 *   The meanings of return value is same as do_verify_xattr_datum().

 * load_xattr_datum(c, xd)

 *   is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum().

 *   If xd need to call do_verify_xattr_datum() at first, it's called before calling

 *   do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum().

 * save_xattr_datum(c, xd)

 *   is used to write xdatum to medium. xd->version will be incremented.

 * create_xattr_datum(c, xprefix, xname, xvalue, xsize)

 *   is used to create new xdatum and write to medium.

 * unrefer_xattr_datum(c, xd)

 *   is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD

 *   is set on xd->flags and chained xattr_dead_list or release it immediately.

 *   In the first case, the garbage collector release it later.

 * -------------------------------------------------- */

static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize)

{

        int name_len = strlen(xname);

        return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize);

}

static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)

{

        struct jffs2_raw_node_ref *raw;

        int rc = 0;

        spin_lock(&c->erase_completion_lock);

        for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {

                if (ref_flags(raw) == REF_UNCHECKED) {

                        rc = 1;

                        break;

                }

        }

        spin_unlock(&c->erase_completion_lock);

        return rc;

}

static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)

{

        /* must be called under down_write(xattr_sem) */

        D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version));

        if (xd->xname) {

                c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len);

                kfree(xd->xname);

        }

        list_del_init(&xd->xindex);

        xd->hashkey = 0;

        xd->xname = NULL;

        xd->xvalue = NULL;

}

static void reclaim_xattr_datum(struct jffs2_sb_info *c)

{

        /* must be called under down_write(xattr_sem) */

        struct jffs2_xattr_datum *xd, *_xd;

        uint32_t target, before;

        static int index = 0;

        int count;

        if (c->xdatum_mem_threshold > c->xdatum_mem_usage)

                return;

        before = c->xdatum_mem_usage;

        target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */

        for (count = 0; count < XATTRINDEX_HASHSIZE; count++) {

                list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) {

                        if (xd->flags & JFFS2_XFLAGS_HOT) {

                                xd->flags &= ~JFFS2_XFLAGS_HOT;

                        } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) {

                                unload_xattr_datum(c, xd);

                        }

                        if (c->xdatum_mem_usage <= target)

                                goto out;

                }

                index = (index+1) % XATTRINDEX_HASHSIZE;

        }

 out:

        JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n",

                     before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);

}

static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)

{

        /* must be called under down_write(xattr_sem) */

        struct jffs2_eraseblock *jeb;

        struct jffs2_raw_node_ref *raw;

        struct jffs2_raw_xattr rx;

        size_t readlen;

        uint32_t crc, offset, totlen;

        int rc;

        spin_lock(&c->erase_completion_lock);

        offset = ref_offset(xd->node);

        if (ref_flags(xd->node) == REF_PRISTINE)

                goto complete;

        spin_unlock(&c->erase_completion_lock);

        rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx);

        if (rc || readlen != sizeof(rx)) {

                JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",

                              rc, sizeof(rx), readlen, offset);

                return rc ? rc : -EIO;

        }

        crc = crc32(0, &rx, sizeof(rx) - 4);

        if (crc != je32_to_cpu(rx.node_crc)) {

                JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",

                            offset, je32_to_cpu(rx.hdr_crc), crc);

                xd->flags |= JFFS2_XFLAGS_INVALID;

                return EIO;

        }

        totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len));

        if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK

            || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR

            || je32_to_cpu(rx.totlen) != totlen

            || je32_to_cpu(rx.xid) != xd->xid

            || je32_to_cpu(rx.version) != xd->version) {

                JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, "

                            "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n",

                            offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,

                            je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR,

                            je32_to_cpu(rx.totlen), totlen,

                            je32_to_cpu(rx.xid), xd->xid,

                            je32_to_cpu(rx.version), xd->version);

                xd->flags |= JFFS2_XFLAGS_INVALID;

                return EIO;

        }

        xd->xprefix = rx.xprefix;

        xd->name_len = rx.name_len;

        xd->value_len = je16_to_cpu(rx.value_len);

        xd->data_crc = je32_to_cpu(rx.data_crc);

        spin_lock(&c->erase_completion_lock);

 complete:

        for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {

                jeb = &c->blocks[ref_offset(raw) / c->sector_size];

                totlen = PAD(ref_totlen(c, jeb, raw));

                if (ref_flags(raw) == REF_UNCHECKED) {

                        c->unchecked_size -= totlen; c->used_size += totlen;

                        jeb->unchecked_size -= totlen; jeb->used_size += totlen;

                }

                raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL);

        }

        spin_unlock(&c->erase_completion_lock);

        /* unchecked xdatum is chained with c->xattr_unchecked */

        list_del_init(&xd->xindex);

        dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n",

                  xd->xid, xd->version);

        return 0;

}

static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)

{

        /* must be called under down_write(xattr_sem) */

        char *data;

        size_t readlen;

        uint32_t crc, length;

        int i, ret, retry = 0;

        BUG_ON(ref_flags(xd->node) != REF_PRISTINE);

        BUG_ON(!list_empty(&xd->xindex));

 retry:

        length = xd->name_len + 1 + xd->value_len;

        data = kmalloc(length, GFP_KERNEL);

        if (!data)

                return -ENOMEM;

        ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr),

                               length, &readlen, data);

        if (ret || length!=readlen) {

                JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n",

                              ret, length, readlen, ref_offset(xd->node));

                kfree(data);

                return ret ? ret : -EIO;

        }

        data[xd->name_len] = '\0';

        crc = crc32(0, data, length);

        if (crc != xd->data_crc) {

                JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)"

                              " at %#08x, read: 0x%08x calculated: 0x%08x\n",

                              ref_offset(xd->node), xd->data_crc, crc);

                kfree(data);

                xd->flags |= JFFS2_XFLAGS_INVALID;

                return EIO;

        }

        xd->flags |= JFFS2_XFLAGS_HOT;

        xd->xname = data;

        xd->xvalue = data + xd->name_len+1;

        c->xdatum_mem_usage += length;

        xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len);

        i = xd->hashkey % XATTRINDEX_HASHSIZE;

        list_add(&xd->xindex, &c->xattrindex[i]);

        if (!retry) {

                retry = 1;

                reclaim_xattr_datum(c);

                if (!xd->xname)

                        goto retry;

        }

        dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n",

                  xd->xid, xd->xprefix, xd->xname);

        return 0;

}

static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)

{

        /* must be called under down_write(xattr_sem);

         * rc < 0 : recoverable error, try again

         * rc = 0 : success

         * rc > 0 : Unrecoverable error, this node should be deleted.

         */

        int rc = 0;

        BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD);

        if (xd->xname)

                return 0;

        if (xd->flags & JFFS2_XFLAGS_INVALID)

                return EIO;

        if (unlikely(is_xattr_datum_unchecked(c, xd)))

                rc = do_verify_xattr_datum(c, xd);

        if (!rc)

                rc = do_load_xattr_datum(c, xd);

        return rc;

}

static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)

{

        /* must be called under down_write(xattr_sem) */

        struct jffs2_raw_xattr rx;

        struct kvec vecs[2];

        size_t length;

        int rc, totlen;

        uint32_t phys_ofs = write_ofs(c);

        BUG_ON(!xd->xname);

        BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID));

        vecs[0].iov_base = ℞

        vecs[0].iov_len = sizeof(rx);

        vecs[1].iov_base = xd->xname;

        vecs[1].iov_len = xd->name_len + 1 + xd->value_len;

        totlen = vecs[0].iov_len + vecs[1].iov_len;

        /* Setup raw-xattr */

        memset(&rx, 0, sizeof(rx));

        rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);

        rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);

        rx.totlen = cpu_to_je32(PAD(totlen));

        rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));

        rx.xid = cpu_to_je32(xd->xid);

        rx.version = cpu_to_je32(++xd->version);

        rx.xprefix = xd->xprefix;

        rx.name_len = xd->name_len;

        rx.value_len = cpu_to_je16(xd->value_len);

        rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));

        rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));

        rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0);

        if (rc || totlen != length) {

                JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n",

                              rc, totlen, length, phys_ofs);

                rc = rc ? rc : -EIO;

                if (length)

                        jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL);

                return rc;

        }

        /* success */

        jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd);

        dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",

                  xd->xid, xd->version, xd->xprefix, xd->xname);

        return 0;

}

static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,

                                                    int xprefix, const char *xname,

                                                    const char *xvalue, int xsize)

{

        /* must be called under down_write(xattr_sem) */

        struct jffs2_xattr_datum *xd;

        uint32_t hashkey, name_len;

        char *data;

        int i, rc;

        /* Search xattr_datum has same xname/xvalue by index */

        hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);

        i = hashkey % XATTRINDEX_HASHSIZE;

        list_for_each_entry(xd, &c->xattrindex[i], xindex) {

                if (xd->hashkey==hashkey

                    && xd->xprefix==xprefix

                    && xd->value_len==xsize

                    && !strcmp(xd->xname, xname)

                    && !memcmp(xd->xvalue, xvalue, xsize)) {

                        atomic_inc(&xd->refcnt);

                        return xd;

                }

        }

        /* Not found, Create NEW XATTR-Cache */

        name_len = strlen(xname);

        xd = jffs2_alloc_xattr_datum();

        if (!xd)

                return ERR_PTR(-ENOMEM);

        data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);

        if (!data) {

                jffs2_free_xattr_datum(xd);

                return ERR_PTR(-ENOMEM);

        }

        strcpy(data, xname);

        memcpy(data + name_len + 1, xvalue, xsize);

        atomic_set(&xd->refcnt, 1);

        xd->xid = ++c->highest_xid;

        xd->flags |= JFFS2_XFLAGS_HOT;

        xd->xprefix = xprefix;

        xd->hashkey = hashkey;

        xd->xname = data;

        xd->xvalue = data + name_len + 1;

        xd->name_len = name_len;

        xd->value_len = xsize;

        xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);

        rc = save_xattr_datum(c, xd);

        if (rc) {

                kfree(xd->xname);

                jffs2_free_xattr_datum(xd);

                return ERR_PTR(rc);

        }

        /* Insert Hash Index */

        i = hashkey % XATTRINDEX_HASHSIZE;

        list_add(&xd->xindex, &c->xattrindex[i]);

        c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);

        reclaim_xattr_datum(c);

        return xd;

}

static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)

{

        /* must be called under down_write(xattr_sem) */

        if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) {

                unload_xattr_datum(c, xd);

                xd->flags |= JFFS2_XFLAGS_DEAD;

                if (xd->node == (void *)xd) {

                        BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID));

                        jffs2_free_xattr_datum(xd);

                } else {

                        list_add(&xd->xindex, &c->xattr_dead_list);

                }

                spin_unlock(&c->erase_completion_lock);

                dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n",

                          xd->xid, xd->version);

        }

}

/* -------- xref related functions ------------------

 * verify_xattr_ref(c, ref)

 *   is used to load xref information from medium. Because summary data does not

 *   contain xid/ino, it's necessary to verify once while mounting process.

 * save_xattr_ref(c, ref)

 *   is used to write xref to medium. If delete marker is marked, it write

 *   a delete marker of xref into medium.

 * create_xattr_ref(c, ic, xd)

 *   is used to create a new xref and write to medium.

 * delete_xattr_ref(c, ref)

 *   is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER,

 *   and allows GC to reclaim those physical nodes.

 * jffs2_xattr_delete_inode(c, ic)

 *   is called to remove xrefs related to obsolete inode when inode is unlinked.

 * jffs2_xattr_free_inode(c, ic)

 *   is called to release xattr related objects when unmounting.

 * check_xattr_ref_inode(c, ic)

 *   is used to confirm inode does not have duplicate xattr name/value pair.

 * -------------------------------------------------- */

static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)

{

        struct jffs2_eraseblock *jeb;

        struct jffs2_raw_node_ref *raw;

        struct jffs2_raw_xref rr;

        size_t readlen;

        uint32_t crc, offset, totlen;

        int rc;

        spin_lock(&c->erase_completion_lock);

        if (ref_flags(ref->node) != REF_UNCHECKED)

                goto complete;

        offset = ref_offset(ref->node);

        spin_unlock(&c->erase_completion_lock);

        rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr);

        if (rc || sizeof(rr) != readlen) {

                JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",

                              rc, sizeof(rr), readlen, offset);

                return rc ? rc : -EIO;

        }

        /* obsolete node */

        crc = crc32(0, &rr, sizeof(rr) - 4);

        if (crc != je32_to_cpu(rr.node_crc)) {

                JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",

                            offset, je32_to_cpu(rr.node_crc), crc);

                return EIO;

        }

        if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK

            || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF

            || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {

                JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "

                            "nodetype=%#04x/%#04x, totlen=%u/%zu\n",

                            offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,

                            je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,

                            je32_to_cpu(rr.totlen), PAD(sizeof(rr)));

                return EIO;

        }

        ref->ino = je32_to_cpu(rr.ino);

        ref->xid = je32_to_cpu(rr.xid);

        ref->xseqno = je32_to_cpu(rr.xseqno);

        if (ref->xseqno > c->highest_xseqno)

                c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);

        spin_lock(&c->erase_completion_lock);

 complete:

        for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) {

                jeb = &c->blocks[ref_offset(raw) / c->sector_size];

                totlen = PAD(ref_totlen(c, jeb, raw));

                if (ref_flags(raw) == REF_UNCHECKED) {

                        c->unchecked_size -= totlen; c->used_size += totlen;

                        jeb->unchecked_size -= totlen; jeb->used_size += totlen;

                }

                raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL);

        }

        spin_unlock(&c->erase_completion_lock);

        dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",

                  ref->ino, ref->xid, ref_offset(ref->node));

        return 0;

}

static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)

{

        /* must be called under down_write(xattr_sem) */

        struct jffs2_raw_xref rr;

        size_t length;

        uint32_t xseqno, phys_ofs = write_ofs(c);

        int ret;

        rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);

        rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);

        rr.totlen = cpu_to_je32(PAD(sizeof(rr)));

        rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));

        xseqno = (c->highest_xseqno += 2);

        if (is_xattr_ref_dead(ref)) {

                xseqno |= XREF_DELETE_MARKER;

                rr.ino = cpu_to_je32(ref->ino);

                rr.xid = cpu_to_je32(ref->xid);

        } else {

                rr.ino = cpu_to_je32(ref->ic->ino);

                rr.xid = cpu_to_je32(ref->xd->xid);

        }

        rr.xseqno = cpu_to_je32(xseqno);

        rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));

        ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);

        if (ret || sizeof(rr) != length) {

                JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",

                              ret, sizeof(rr), length, phys_ofs);

                ret = ret ? ret : -EIO;

                if (length)

                        jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);

                return ret;

        }

        /* success */

        ref->xseqno = xseqno;

        jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref);

        dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);

        return 0;

}

static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,

                                                struct jffs2_xattr_datum *xd)

{

        /* must be called under down_write(xattr_sem) */

        struct jffs2_xattr_ref *ref;

        int ret;

        ref = jffs2_alloc_xattr_ref();

        if (!ref)

                return ERR_PTR(-ENOMEM);

        ref->ic = ic;

        ref->xd = xd;

        ret = save_xattr_ref(c, ref);

        if (ret) {

                jffs2_free_xattr_ref(ref);

                return ERR_PTR(ret);

        }

        /* Chain to inode */

        ref->next = ic->xref;

        ic->xref = ref;

        return ref; /* success */

}

static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)

{

        /* must be called under down_write(xattr_sem) */

        struct jffs2_xattr_datum *xd;

        xd = ref->xd;

        ref->xseqno |= XREF_DELETE_MARKER;

        ref->ino = ref->ic->ino;

        ref->xid = ref->xd->xid;

        spin_lock(&c->erase_completion_lock);

        ref->next = c->xref_dead_list;

        c->xref_dead_list = ref;

        spin_unlock(&c->erase_completion_lock);

        dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",

                  ref->ino, ref->xid, ref->xseqno);

        unrefer_xattr_datum(c, xd);

}

void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)

{

        /* It's called from jffs2_clear_inode() on inode removing.

           When an inode with XATTR is removed, those XATTRs must be removed. */

        struct jffs2_xattr_ref *ref, *_ref;

        if (!ic || ic->nlink > 0)

                return;

        down_write(&c->xattr_sem);

        for (ref = ic->xref; ref; ref = _ref) {

                _ref = ref->next;

                delete_xattr_ref(c, ref);

        }

        ic->xref = NULL;

        up_write(&c->xattr_sem);

}

void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)

{

        /* It's called from jffs2_free_ino_caches() until unmounting FS. */

        struct jffs2_xattr_datum *xd;

        struct jffs2_xattr_ref *ref, *_ref;

        down_write(&c->xattr_sem);

        for (ref = ic->xref; ref; ref = _ref) {

                _ref = ref->next;

                xd = ref->xd;

                if (atomic_dec_and_test(&xd->refcnt)) {

                        unload_xattr_datum(c, xd);

                        jffs2_free_xattr_datum(xd);