* 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.
- * delete_xattr_datum_node(c, xd)
- * is used to delete a jffs2 node is dominated by xdatum. When EBS(Erase Block Summary) is
- * enabled, it overwrites the obsolete node by myself.
- * delete_xattr_datum(c, xd)
- * is used to delete jffs2_xattr_datum object. It must be called with 0-value of reference
- * counter. (It means how many jffs2_xattr_ref object refers this xdatum.)
* 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
* 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) */
before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);
}
-static void delete_xattr_datum_node(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
-{
- /* must be called under down_write(xattr_sem) */
- struct jffs2_raw_xattr rx;
- size_t length;
- int rc;
-
- if (!xd->node) {
- JFFS2_WARNING("xdatum (xid=%u) is removed twice.\n", xd->xid);
- return;
- }
- if (jffs2_sum_active()) {
- memset(&rx, 0xff, sizeof(struct jffs2_raw_xattr));
- rc = jffs2_flash_read(c, ref_offset(xd->node),
- sizeof(struct jffs2_unknown_node),
- &length, (char *)&rx);
- if (rc || length != sizeof(struct jffs2_unknown_node)) {
- JFFS2_ERROR("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
- rc, sizeof(struct jffs2_unknown_node),
- length, ref_offset(xd->node));
- }
- rc = jffs2_flash_write(c, ref_offset(xd->node), sizeof(rx),
- &length, (char *)&rx);
- if (rc || length != sizeof(struct jffs2_raw_xattr)) {
- JFFS2_ERROR("jffs2_flash_write()=%d, req=%zu, wrote=%zu ar %#08x\n",
- rc, sizeof(rx), length, ref_offset(xd->node));
- }
- }
- spin_lock(&c->erase_completion_lock);
- xd->node->next_in_ino = NULL;
- spin_unlock(&c->erase_completion_lock);
- jffs2_mark_node_obsolete(c, xd->node);
- xd->node = NULL;
-}
-
-static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
-{
- /* must be called under down_write(xattr_sem) */
- BUG_ON(xd->refcnt);
-
- unload_xattr_datum(c, xd);
- if (xd->node) {
- delete_xattr_datum_node(c, xd);
- xd->node = NULL;
- }
- jffs2_free_xattr_datum(xd);
-}
-
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, totlen;
+ uint32_t crc, offset, totlen;
int rc;
- BUG_ON(!xd->node);
- BUG_ON(ref_flags(xd->node) != REF_UNCHECKED);
+ 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, ref_offset(xd->node), sizeof(rx), &readlen, (char *)&rx);
+ 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, ref_offset(xd->node));
+ rc, sizeof(rx), readlen, offset);
return rc ? rc : -EIO;
}
crc = crc32(0, &rx, sizeof(rx) - 4);
if (crc != je32_to_cpu(rx.node_crc)) {
- if (je32_to_cpu(rx.node_crc) != 0xffffffff)
- JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
- ref_offset(xd->node), je32_to_cpu(rx.hdr_crc), 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));
|| 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",
- ref_offset(xd->node), je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,
+ 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->value_len = je16_to_cpu(rx.value_len);
xd->data_crc = je32_to_cpu(rx.data_crc);
- /* This JFFS2_NODETYPE_XATTR node is checked */
- jeb = &c->blocks[ref_offset(xd->node) / c->sector_size];
- totlen = PAD(je32_to_cpu(rx.totlen));
-
spin_lock(&c->erase_completion_lock);
- c->unchecked_size -= totlen; c->used_size += totlen;
- jeb->unchecked_size -= totlen; jeb->used_size += totlen;
- xd->node->flash_offset = ref_offset(xd->node) | REF_PRISTINE;
+ 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 */
uint32_t crc, length;
int i, ret, retry = 0;
- BUG_ON(!xd->node);
BUG_ON(ref_flags(xd->node) != REF_PRISTINE);
BUG_ON(!list_empty(&xd->xindex));
retry:
" 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;
}
* rc > 0 : Unrecoverable error, this node should be deleted.
*/
int rc = 0;
- BUG_ON(xd->xname);
- if (!xd->node)
+
+ BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD);
+ if (xd->xname)
+ return 0;
+ if (xd->flags & JFFS2_XFLAGS_INVALID)
return EIO;
- if (unlikely(ref_flags(xd->node) != REF_PRISTINE)) {
+ if (unlikely(is_xattr_datum_unchecked(c, xd)))
rc = do_verify_xattr_datum(c, xd);
- if (rc > 0) {
- list_del_init(&xd->xindex);
- delete_xattr_datum_node(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_node_ref *raw;
struct jffs2_raw_xattr rx;
struct kvec vecs[2];
size_t length;
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 = PAD(sizeof(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));
return rc;
}
-
/* success */
- raw = jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), NULL);
- /* FIXME */ raw->next_in_ino = (void *)xd;
-
- if (xd->node)
- delete_xattr_datum_node(c, xd);
- xd->node = raw;
+ 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);
&& xd->value_len==xsize
&& !strcmp(xd->xname, xname)
&& !memcmp(xd->xvalue, xvalue, xsize)) {
- xd->refcnt++;
+ atomic_inc(&xd->refcnt);
return xd;
}
}
strcpy(data, xname);
memcpy(data + name_len + 1, xvalue, xsize);
- xd->refcnt = 1;
+ atomic_set(&xd->refcnt, 1);
xd->xid = ++c->highest_xid;
xd->flags |= JFFS2_XFLAGS_HOT;
xd->xprefix = xprefix;
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)) {
+ uint32_t xid = xd->xid, version = xd->version;
+
+ 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", xid, 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.
- * delete_xattr_ref_node(c, ref)
- * is used to delete a jffs2 node is dominated by xref. When EBS is enabled,
- * it overwrites the obsolete node by myself.
- * delete_xattr_ref(c, ref)
- * is used to delete jffs2_xattr_ref object. If the reference counter of xdatum
- * is refered by this xref become 0, delete_xattr_datum() is called later.
* save_xattr_ref(c, ref)
- * is used to write xref to medium.
+ * 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)
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, totlen;
+ uint32_t crc, offset, totlen;
int rc;
- BUG_ON(ref_flags(ref->node) != REF_UNCHECKED);
+ 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, ref_offset(ref->node), sizeof(rr), &readlen, (char *)&rr);
+ 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, ref_offset(ref->node));
+ 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)) {
- if (je32_to_cpu(rr.node_crc) != 0xffffffff)
- JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
- ref_offset(ref->node), je32_to_cpu(rr.node_crc), 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
|| je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
"nodetype=%#04x/%#04x, totlen=%u/%zu\n",
- ref_offset(ref->node), je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
+ 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);
-
- /* fixup superblock/eraseblock info */
- jeb = &c->blocks[ref_offset(ref->node) / c->sector_size];
- totlen = PAD(sizeof(rr));
+ 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);
- c->unchecked_size -= totlen; c->used_size += totlen;
- jeb->unchecked_size -= totlen; jeb->used_size += totlen;
- ref->node->flash_offset = ref_offset(ref->node) | REF_PRISTINE;
+ 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",
return 0;
}
-static void delete_xattr_ref_node(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
-{
- struct jffs2_raw_xref rr;
- size_t length;
- int rc;
-
- if (jffs2_sum_active()) {
- memset(&rr, 0xff, sizeof(rr));
- rc = jffs2_flash_read(c, ref_offset(ref->node),
- sizeof(struct jffs2_unknown_node),
- &length, (char *)&rr);
- if (rc || length != sizeof(struct jffs2_unknown_node)) {
- JFFS2_ERROR("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
- rc, sizeof(struct jffs2_unknown_node),
- length, ref_offset(ref->node));
- }
- rc = jffs2_flash_write(c, ref_offset(ref->node), sizeof(rr),
- &length, (char *)&rr);
- if (rc || length != sizeof(struct jffs2_raw_xref)) {
- JFFS2_ERROR("jffs2_flash_write()=%d, req=%zu, wrote=%zu at %#08x\n",
- rc, sizeof(rr), length, ref_offset(ref->node));
- }
- }
- spin_lock(&c->erase_completion_lock);
- ref->node->next_in_ino = NULL;
- spin_unlock(&c->erase_completion_lock);
- jffs2_mark_node_obsolete(c, ref->node);
- ref->node = NULL;
-}
-
-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;
-
- BUG_ON(!ref->node);
- delete_xattr_ref_node(c, ref);
-
- xd = ref->xd;
- xd->refcnt--;
- if (!xd->refcnt)
- delete_xattr_datum(c, xd);
- jffs2_free_xattr_ref(ref);
-}
-
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_node_ref *raw;
struct jffs2_raw_xref rr;
size_t length;
- uint32_t phys_ofs = write_ofs(c);
+ uint32_t xseqno, phys_ofs = write_ofs(c);
int ret;
rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
- rr.ino = cpu_to_je32(ref->ic->ino);
- rr.xid = cpu_to_je32(ref->xd->xid);
+ 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);
return ret;
}
-
- raw = jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), NULL);
- /* FIXME */ raw->next_in_ino = (void *)ref;
- if (ref->node)
- delete_xattr_ref_node(c, ref);
- ref->node = raw;
+ /* 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 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.
for (ref = ic->xref; ref; ref = _ref) {
_ref = ref->next;
xd = ref->xd;
- xd->refcnt--;
- if (!xd->refcnt) {
+ if (atomic_dec_and_test(&xd->refcnt)) {
unload_xattr_datum(c, xd);
jffs2_free_xattr_datum(xd);
}
* duplicate name/value pairs. If duplicate name/value pair would be found,
* one will be removed.
*/
- struct jffs2_xattr_ref *ref, *cmp, **pref;
+ struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
int rc = 0;
if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
} else if (unlikely(rc < 0))
goto out;
}
- for (cmp=ref->next, pref=&ref->next; cmp; pref=&cmp->next, cmp=cmp->next) {
+ 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)) {
- *pref = cmp->next;
+ *pcmp = cmp->next;
delete_xattr_ref(c, cmp);
goto retry;
} else if (unlikely(rc < 0))
}
if (ref->xd->xprefix == cmp->xd->xprefix
&& !strcmp(ref->xd->xname, cmp->xd->xname)) {
- *pref = cmp->next;
- delete_xattr_ref(c, cmp);
+ if (ref->xseqno > cmp->xseqno) {
+ *pcmp = cmp->next;
+ delete_xattr_ref(c, cmp);
+ } else {
+ *pref = ref->next;
+ delete_xattr_ref(c, ref);
+ }
goto retry;
}
}
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 */
}
_ref = ref->next;
jffs2_free_xattr_ref(ref);
}
- c->xref_temp = NULL;
+
+ 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) {
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);
+ }
}
+#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;
- int i, xdatum_count =0, xdatum_unchecked_count = 0, xref_count = 0;
+ 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 */
+ /* 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;
- /* checking REF_UNCHECKED nodes */
if (ref_flags(ref->node) != REF_PRISTINE) {
if (verify_xattr_ref(c, ref)) {
- delete_xattr_ref_node(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;
}
}
- /* 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) {
- if (ref_flags(ref->node) != REF_UNCHECKED)
- JFFS2_WARNING("xref(ino=%u, xid=%u) is orphan. \n",
- ref->ino, ref->xid);
- delete_xattr_ref_node(c, ref);
+
+ 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;
}
- ref->xd = xd;
- ref->ic = ic;
- xd->refcnt++;
- ref->next = ic->xref;
- ic->xref = ref;
- xref_count++;
}
c->xref_temp = NULL;
- /* After this, ref->xid/ino are NEVER used. */
- /* Phase.2 */
+ /* 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) {
+ 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 (!xd->refcnt) {
- if (ref_flags(xd->node) != REF_UNCHECKED)
- JFFS2_WARNING("orphan xdatum(xid=%u, version=%u) at %#08x\n",
- xd->xid, xd->version, ref_offset(xd->node));
- delete_xattr_datum(c, xd);
+ 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 (ref_flags(xd->node) != REF_PRISTINE) {
- dbg_xattr("unchecked xdatum(xid=%u) at %#08x\n",
- xd->xid, ref_offset(xd->node));
+ 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++;
}
- xdatum_count++;
}
}
/* build complete */
- JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum (%u unchecked) and "
- "%u of xref found.\n", xdatum_count, xdatum_unchecked_count, xref_count);
+ 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;
+ struct jffs2_xattr_datum *xd;
- _xd = jffs2_find_xattr_datum(c, xid);
- if (_xd) {
- dbg_xattr("duplicate xdatum (xid=%u, version=%u/%u) at %#08x\n",
- xid, version, _xd->version, ref_offset(_xd->node));
- if (version < _xd->version)
- return ERR_PTR(-EEXIST);
- }
- 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]);
-
- if (_xd) {
- list_del_init(&_xd->xindex);
- delete_xattr_datum_node(c, _xd);
- jffs2_free_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;
}
goto out;
}
if (!buffer) {
- *pref = ref->next;
- delete_xattr_ref(c, ref);
- rc = 0;
+ 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;
goto out;
}
if (!buffer) {
- rc = -EINVAL;
+ rc = -ENODATA;
goto out;
}
found:
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);
- down_write(&c->xattr_sem);
- xd->refcnt--;
- if (!xd->refcnt)
- delete_xattr_datum(c, xd);
+ unrefer_xattr_datum(c, xd);
up_write(&c->xattr_sem);
return rc;
}
- down_write(&c->xattr_sem);
if (ref)
*pref = ref->next;
newref = create_xattr_ref(c, ic, xd);
ic->xref = ref;
}
rc = PTR_ERR(newref);
- xd->refcnt--;
- if (!xd->refcnt)
- delete_xattr_datum(c, xd);
+ unrefer_xattr_datum(c, xd);
} else if (ref) {
delete_xattr_ref(c, ref);
}
}
/* -------- garbage collector functions -------------
- * jffs2_garbage_collect_xattr_datum(c, xd)
+ * jffs2_garbage_collect_xattr_datum(c, xd, raw)
* is used to move xdatum into new node.
- * jffs2_garbage_collect_xattr_ref(c, ref)
+ * 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)
+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 = -EINVAL;
+ int rc = 0;
down_write(&c->xattr_sem);
- BUG_ON(!xd->node);
-
- old_ofs = ref_offset(xd->node);
- totlen = ref_totlen(c, c->gcblock, xd->node);
- if (totlen < sizeof(struct jffs2_raw_xattr))
+ if (xd->node != raw)
+ goto out;
+ if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
goto out;
- if (!xd->xname) {
- rc = load_xattr_datum(c, xd);
- if (unlikely(rc > 0)) {
- delete_xattr_datum_node(c, xd);
- rc = 0;
- goto out;
- } else if (unlikely(rc < 0))
- 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 || length < totlen) {
- JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, totlen);
+ if (rc) {
+ JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
rc = rc ? rc : -EBADFD;
goto out;
}
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)
+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 = -EINVAL;
+ 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);
- if (totlen != sizeof(struct jffs2_raw_xref))
- goto out;
rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
- if (rc || length < totlen) {
- JFFS2_WARNING("%s: jffs2_reserve_space() = %d, request = %u\n",
+ if (rc) {
+ JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
__FUNCTION__, rc, totlen);
rc = rc ? rc : -EBADFD;
goto out;
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) {
- list_del_init(&xd->xindex);
- break;
- } else if (rc > 0) {
- list_del_init(&xd->xindex);
- delete_xattr_datum_node(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);
+}
git.openpandora.org / pandora-kernel.git / blobdiff