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linux/fs/jffs2/xattr.c
Christoph Hellwig 431547b3c4 sanitize xattr handler prototypes 
Add a flags argument to struct xattr_handler and pass it to all xattr
handler methods.  This allows using the same methods for multiple
handlers, e.g. for the ACL methods which perform exactly the same action
for the access and default ACLs, just using a different underlying
attribute.  With a little more groundwork it'll also allow sharing the
methods for the regular user/trusted/secure handlers in extN, ocfs2 and
jffs2 like it's already done for xfs in this patch.

Also change the inode argument to the handlers to a dentry to allow
using the handlers mechnism for filesystems that require it later,
e.g. cifs.

[with GFS2 bits updated by Steven Whitehouse <swhiteho@redhat.com>]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-12-16 12:16:49 -05:00

1331 lines
38 KiB
C
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/*
* 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. Currently, 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", __func__, 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 = &rx;
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->pino_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);
}
jffs2_free_xattr_ref(ref);
}
ic->xref = NULL;
up_write(&c->xattr_sem);
}
static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
{
/* success of check_xattr_ref_inode() means taht inode (ic) dose not have
* duplicate name/value pairs. If duplicate name/value pair would be found,
* one will be removed.
*/
struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
int rc = 0;
if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
return 0;
down_write(&c->xattr_sem);
retry:
rc = 0;
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
if (!ref->xd->xname) {
rc = load_xattr_datum(c, ref->xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0))
goto out;
}
for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) {
if (!cmp->xd->xname) {
ref->xd->flags |= JFFS2_XFLAGS_BIND;
rc = load_xattr_datum(c, cmp->xd);
ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
if (unlikely(rc > 0)) {
*pcmp = cmp->next;
delete_xattr_ref(c, cmp);
goto retry;
} else if (unlikely(rc < 0))
goto out;
}
if (ref->xd->xprefix == cmp->xd->xprefix
&& !strcmp(ref->xd->xname, cmp->xd->xname)) {
if (ref->xseqno > cmp->xseqno) {
*pcmp = cmp->next;
delete_xattr_ref(c, cmp);
} else {
*pref = ref->next;
delete_xattr_ref(c, ref);
}
goto retry;
}
}
}
ic->flags |= INO_FLAGS_XATTR_CHECKED;
out:
up_write(&c->xattr_sem);
return rc;
}
/* -------- xattr subsystem functions ---------------
* jffs2_init_xattr_subsystem(c)
* is used to initialize semaphore and list_head, and some variables.
* jffs2_find_xattr_datum(c, xid)
* is used to lookup xdatum while scanning process.
* jffs2_clear_xattr_subsystem(c)
* is used to release any xattr related objects.
* jffs2_build_xattr_subsystem(c)
* is used to associate xdatum and xref while super block building process.
* jffs2_setup_xattr_datum(c, xid, version)
* is used to insert xdatum while scanning process.
* -------------------------------------------------- */
void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
{
int i;
for (i=0; i < XATTRINDEX_HASHSIZE; i++)
INIT_LIST_HEAD(&c->xattrindex[i]);
INIT_LIST_HEAD(&c->xattr_unchecked);
INIT_LIST_HEAD(&c->xattr_dead_list);
c->xref_dead_list = NULL;
c->xref_temp = NULL;
init_rwsem(&c->xattr_sem);
c->highest_xid = 0;
c->highest_xseqno = 0;
c->xdatum_mem_usage = 0;
c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
}
static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
{
struct jffs2_xattr_datum *xd;
int i = xid % XATTRINDEX_HASHSIZE;
/* It's only used in scanning/building process. */
BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
list_for_each_entry(xd, &c->xattrindex[i], xindex) {
if (xd->xid==xid)
return xd;
}
return NULL;
}
void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
{
struct jffs2_xattr_datum *xd, *_xd;
struct jffs2_xattr_ref *ref, *_ref;
int i;
for (ref=c->xref_temp; ref; ref = _ref) {
_ref = ref->next;
jffs2_free_xattr_ref(ref);
}
for (ref=c->xref_dead_list; ref; ref = _ref) {
_ref = ref->next;
jffs2_free_xattr_ref(ref);
}
for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
list_del(&xd->xindex);
if (xd->xname)
kfree(xd->xname);
jffs2_free_xattr_datum(xd);
}
}
list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) {
list_del(&xd->xindex);
jffs2_free_xattr_datum(xd);
}
list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
list_del(&xd->xindex);
jffs2_free_xattr_datum(xd);
}
}
#define XREF_TMPHASH_SIZE (128)
void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
{
struct jffs2_xattr_ref *ref, *_ref;
struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
struct jffs2_xattr_datum *xd, *_xd;
struct jffs2_inode_cache *ic;
struct jffs2_raw_node_ref *raw;
int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0;
int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0;
BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
/* Phase.1 : Merge same xref */
for (i=0; i < XREF_TMPHASH_SIZE; i++)
xref_tmphash[i] = NULL;
for (ref=c->xref_temp; ref; ref=_ref) {
struct jffs2_xattr_ref *tmp;
_ref = ref->next;
if (ref_flags(ref->node) != REF_PRISTINE) {
if (verify_xattr_ref(c, ref)) {
BUG_ON(ref->node->next_in_ino != (void *)ref);
ref->node->next_in_ino = NULL;
jffs2_mark_node_obsolete(c, ref->node);
jffs2_free_xattr_ref(ref);
continue;
}
}
i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE;
for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) {
if (tmp->ino == ref->ino && tmp->xid == ref->xid)
break;
}
if (tmp) {
raw = ref->node;
if (ref->xseqno > tmp->xseqno) {
tmp->xseqno = ref->xseqno;
raw->next_in_ino = tmp->node;
tmp->node = raw;
} else {
raw->next_in_ino = tmp->node->next_in_ino;
tmp->node->next_in_ino = raw;
}
jffs2_free_xattr_ref(ref);
continue;
} else {
ref->next = xref_tmphash[i];
xref_tmphash[i] = ref;
}
}
c->xref_temp = NULL;
/* Phase.2 : Bind xref with inode_cache and xattr_datum */
for (i=0; i < XREF_TMPHASH_SIZE; i++) {
for (ref=xref_tmphash[i]; ref; ref=_ref) {
xref_count++;
_ref = ref->next;
if (is_xattr_ref_dead(ref)) {
ref->next = c->xref_dead_list;
c->xref_dead_list = ref;
xref_dead_count++;
continue;
}
/* At this point, ref->xid and ref->ino contain XID and inode number.
ref->xd and ref->ic are not valid yet. */
xd = jffs2_find_xattr_datum(c, ref->xid);
ic = jffs2_get_ino_cache(c, ref->ino);
if (!xd || !ic || !ic->pino_nlink) {
dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n",
ref->ino, ref->xid, ref->xseqno);
ref->xseqno |= XREF_DELETE_MARKER;
ref->next = c->xref_dead_list;
c->xref_dead_list = ref;
xref_orphan_count++;
continue;
}
ref->xd = xd;
ref->ic = ic;
atomic_inc(&xd->refcnt);
ref->next = ic->xref;
ic->xref = ref;
}
}
/* Phase.3 : Link unchecked xdatum to xattr_unchecked list */
for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
xdatum_count++;
list_del_init(&xd->xindex);
if (!atomic_read(&xd->refcnt)) {
dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n",
xd->xid, xd->version);
xd->flags |= JFFS2_XFLAGS_DEAD;
list_add(&xd->xindex, &c->xattr_unchecked);
xdatum_orphan_count++;
continue;
}
if (is_xattr_datum_unchecked(c, xd)) {
dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n",
xd->xid, xd->version);
list_add(&xd->xindex, &c->xattr_unchecked);
xdatum_unchecked_count++;
}
}
}
/* build complete */
JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum"
" (%u unchecked, %u orphan) and "
"%u of xref (%u dead, %u orphan) found.\n",
xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
xref_count, xref_dead_count, xref_orphan_count);
}
struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
uint32_t xid, uint32_t version)
{
struct jffs2_xattr_datum *xd;
xd = jffs2_find_xattr_datum(c, xid);
if (!xd) {
xd = jffs2_alloc_xattr_datum();
if (!xd)
return ERR_PTR(-ENOMEM);
xd->xid = xid;
xd->version = version;
if (xd->xid > c->highest_xid)
c->highest_xid = xd->xid;
list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
}
return xd;
}
/* -------- xattr subsystem functions ---------------
* xprefix_to_handler(xprefix)
* is used to translate xprefix into xattr_handler.
* jffs2_listxattr(dentry, buffer, size)
* is an implementation of listxattr handler on jffs2.
* do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
* is an implementation of getxattr handler on jffs2.
* do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
* is an implementation of setxattr handler on jffs2.
* -------------------------------------------------- */
struct xattr_handler *jffs2_xattr_handlers[] = {
&jffs2_user_xattr_handler,
#ifdef CONFIG_JFFS2_FS_SECURITY
&jffs2_security_xattr_handler,
#endif
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
&jffs2_acl_access_xattr_handler,
&jffs2_acl_default_xattr_handler,
#endif
&jffs2_trusted_xattr_handler,
NULL
};
static struct xattr_handler *xprefix_to_handler(int xprefix) {
struct xattr_handler *ret;
switch (xprefix) {
case JFFS2_XPREFIX_USER:
ret = &jffs2_user_xattr_handler;
break;
#ifdef CONFIG_JFFS2_FS_SECURITY
case JFFS2_XPREFIX_SECURITY:
ret = &jffs2_security_xattr_handler;
break;
#endif
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
case JFFS2_XPREFIX_ACL_ACCESS:
ret = &jffs2_acl_access_xattr_handler;
break;
case JFFS2_XPREFIX_ACL_DEFAULT:
ret = &jffs2_acl_default_xattr_handler;
break;
#endif
case JFFS2_XPREFIX_TRUSTED:
ret = &jffs2_trusted_xattr_handler;
break;
default:
ret = NULL;
break;
}
return ret;
}
ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
struct inode *inode = dentry->d_inode;
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
struct jffs2_inode_cache *ic = f->inocache;
struct jffs2_xattr_ref *ref, **pref;
struct jffs2_xattr_datum *xd;
struct xattr_handler *xhandle;
ssize_t len, rc;
int retry = 0;
rc = check_xattr_ref_inode(c, ic);
if (unlikely(rc))
return rc;
down_read(&c->xattr_sem);
retry:
len = 0;
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
BUG_ON(ref->ic != ic);
xd = ref->xd;
if (!xd->xname) {
/* xdatum is unchached */
if (!retry) {
retry = 1;
up_read(&c->xattr_sem);
down_write(&c->xattr_sem);
goto retry;
} else {
rc = load_xattr_datum(c, xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0))
goto out;
}
}
xhandle = xprefix_to_handler(xd->xprefix);
if (!xhandle)
continue;
if (buffer) {
rc = xhandle->list(dentry, buffer+len, size-len,
xd->xname, xd->name_len, xd->flags);
} else {
rc = xhandle->list(dentry, NULL, 0, xd->xname,
xd->name_len, xd->flags);
}
if (rc < 0)
goto out;
len += rc;
}
rc = len;
out:
if (!retry) {
up_read(&c->xattr_sem);
} else {
up_write(&c->xattr_sem);
}
return rc;
}
int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
char *buffer, size_t size)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
struct jffs2_inode_cache *ic = f->inocache;
struct jffs2_xattr_datum *xd;
struct jffs2_xattr_ref *ref, **pref;
int rc, retry = 0;
rc = check_xattr_ref_inode(c, ic);
if (unlikely(rc))
return rc;
down_read(&c->xattr_sem);
retry:
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
BUG_ON(ref->ic!=ic);
xd = ref->xd;
if (xd->xprefix != xprefix)
continue;
if (!xd->xname) {
/* xdatum is unchached */
if (!retry) {
retry = 1;
up_read(&c->xattr_sem);
down_write(&c->xattr_sem);
goto retry;
} else {
rc = load_xattr_datum(c, xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0)) {
goto out;
}
}
}
if (!strcmp(xname, xd->xname)) {
rc = xd->value_len;
if (buffer) {
if (size < rc) {
rc = -ERANGE;
} else {
memcpy(buffer, xd->xvalue, rc);
}
}
goto out;
}
}
rc = -ENODATA;
out:
if (!retry) {
up_read(&c->xattr_sem);
} else {
up_write(&c->xattr_sem);
}
return rc;
}
int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
const char *buffer, size_t size, int flags)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
struct jffs2_inode_cache *ic = f->inocache;
struct jffs2_xattr_datum *xd;
struct jffs2_xattr_ref *ref, *newref, **pref;
uint32_t length, request;
int rc;
rc = check_xattr_ref_inode(c, ic);
if (unlikely(rc))
return rc;
request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
rc = jffs2_reserve_space(c, request, &length,
ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
if (rc) {
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
return rc;
}
/* Find existing xattr */
down_write(&c->xattr_sem);
retry:
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
xd = ref->xd;
if (xd->xprefix != xprefix)
continue;
if (!xd->xname) {
rc = load_xattr_datum(c, xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0))
goto out;
}
if (!strcmp(xd->xname, xname)) {
if (flags & XATTR_CREATE) {
rc = -EEXIST;
goto out;
}
if (!buffer) {
ref->ino = ic->ino;
ref->xid = xd->xid;
ref->xseqno |= XREF_DELETE_MARKER;
rc = save_xattr_ref(c, ref);
if (!rc) {
*pref = ref->next;
spin_lock(&c->erase_completion_lock);
ref->next = c->xref_dead_list;
c->xref_dead_list = ref;
spin_unlock(&c->erase_completion_lock);
unrefer_xattr_datum(c, xd);
} else {
ref->ic = ic;
ref->xd = xd;
ref->xseqno &= ~XREF_DELETE_MARKER;
}
goto out;
}
goto found;
}
}
/* not found */
if (flags & XATTR_REPLACE) {
rc = -ENODATA;
goto out;
}
if (!buffer) {
rc = -ENODATA;
goto out;
}
found:
xd = create_xattr_datum(c, xprefix, xname, buffer, size);
if (IS_ERR(xd)) {
rc = PTR_ERR(xd);
goto out;
}
up_write(&c->xattr_sem);
jffs2_complete_reservation(c);
/* create xattr_ref */
request = PAD(sizeof(struct jffs2_raw_xref));
rc = jffs2_reserve_space(c, request, &length,
ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
down_write(&c->xattr_sem);
if (rc) {
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
unrefer_xattr_datum(c, xd);
up_write(&c->xattr_sem);
return rc;
}
if (ref)
*pref = ref->next;
newref = create_xattr_ref(c, ic, xd);
if (IS_ERR(newref)) {
if (ref) {
ref->next = ic->xref;
ic->xref = ref;
}
rc = PTR_ERR(newref);
unrefer_xattr_datum(c, xd);
} else if (ref) {
delete_xattr_ref(c, ref);
}
out:
up_write(&c->xattr_sem);
jffs2_complete_reservation(c);
return rc;
}
/* -------- garbage collector functions -------------
* jffs2_garbage_collect_xattr_datum(c, xd, raw)
* is used to move xdatum into new node.
* jffs2_garbage_collect_xattr_ref(c, ref, raw)
* is used to move xref into new node.
* jffs2_verify_xattr(c)
* is used to call do_verify_xattr_datum() before garbage collecting.
* jffs2_release_xattr_datum(c, xd)
* is used to release an in-memory object of xdatum.
* jffs2_release_xattr_ref(c, ref)
* is used to release an in-memory object of xref.
* -------------------------------------------------- */
int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
struct jffs2_raw_node_ref *raw)
{
uint32_t totlen, length, old_ofs;
int rc = 0;
down_write(&c->xattr_sem);
if (xd->node != raw)
goto out;
if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
goto out;
rc = load_xattr_datum(c, xd);
if (unlikely(rc)) {
rc = (rc > 0) ? 0 : rc;
goto out;
}
old_ofs = ref_offset(xd->node);
totlen = PAD(sizeof(struct jffs2_raw_xattr)
+ xd->name_len + 1 + xd->value_len);
rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
if (rc) {
JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
goto out;
}
rc = save_xattr_datum(c, xd);
if (!rc)
dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
xd->xid, xd->version, old_ofs, ref_offset(xd->node));
out:
if (!rc)
jffs2_mark_node_obsolete(c, raw);
up_write(&c->xattr_sem);
return rc;
}
int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
struct jffs2_raw_node_ref *raw)
{
uint32_t totlen, length, old_ofs;
int rc = 0;
down_write(&c->xattr_sem);
BUG_ON(!ref->node);
if (ref->node != raw)
goto out;
if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref))
goto out;
old_ofs = ref_offset(ref->node);
totlen = ref_totlen(c, c->gcblock, ref->node);
rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
if (rc) {
JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
__func__, rc, totlen);
rc = rc ? rc : -EBADFD;
goto out;
}
rc = save_xattr_ref(c, ref);
if (!rc)
dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
out:
if (!rc)
jffs2_mark_node_obsolete(c, raw);
up_write(&c->xattr_sem);
return rc;
}
int jffs2_verify_xattr(struct jffs2_sb_info *c)
{
struct jffs2_xattr_datum *xd, *_xd;
struct jffs2_eraseblock *jeb;
struct jffs2_raw_node_ref *raw;
uint32_t totlen;
int rc;
down_write(&c->xattr_sem);
list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
rc = do_verify_xattr_datum(c, xd);
if (rc < 0)
continue;
list_del_init(&xd->xindex);
spin_lock(&c->erase_completion_lock);
for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
if (ref_flags(raw) != REF_UNCHECKED)
continue;
jeb = &c->blocks[ref_offset(raw) / c->sector_size];
totlen = PAD(ref_totlen(c, jeb, raw));
c->unchecked_size -= totlen; c->used_size += totlen;
jeb->unchecked_size -= totlen; jeb->used_size += totlen;
raw->flash_offset = ref_offset(raw)
| ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
}
if (xd->flags & JFFS2_XFLAGS_DEAD)
list_add(&xd->xindex, &c->xattr_dead_list);
spin_unlock(&c->erase_completion_lock);
}
up_write(&c->xattr_sem);
return list_empty(&c->xattr_unchecked) ? 1 : 0;
}
void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
{
/* must be called under spin_lock(&c->erase_completion_lock) */
if (atomic_read(&xd->refcnt) || xd->node != (void *)xd)
return;
list_del(&xd->xindex);
jffs2_free_xattr_datum(xd);
}
void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
{
/* must be called under spin_lock(&c->erase_completion_lock) */
struct jffs2_xattr_ref *tmp, **ptmp;
if (ref->node != (void *)ref)
return;
for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
if (ref == tmp) {
*ptmp = tmp->next;
break;
}
}
jffs2_free_xattr_ref(ref);
}
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