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[JFFS2][XATTR] rid unnecessary writing of delete marker.

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In the followinf situation, an explicit delete marker is not
necessary, because we can certainlly detect those obsolete
xattr_datum or xattr_ref on next mounting.

- When to delete xattr_datum node.
- When to delete xattr_ref node on removing inode.
- When to delete xattr_ref node on updating xattr.

This patch rids writing delete marker in those situations.

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
KaiGai Kohei 2006-06-24 09:14:13 +09:00 committed by David Woodhouse
parent a1ae76e96a
commit 8a13695cbe
3 changed files with 105 additions and 227 deletions
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6
fs/jffs2/scan.c
View File

@ -332,10 +332,8 @@ static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
xid = je32_to_cpu(rx->xid);
version = je32_to_cpu(rx->version);
totlen = sizeof(struct jffs2_raw_xattr);
if (version != XDATUM_DELETE_MARKER)
totlen += rx->name_len + 1 + je16_to_cpu(rx->value_len);
totlen = PAD(totlen);
totlen = PAD(sizeof(struct jffs2_raw_xattr)
+ rx->name_len + 1 + je16_to_cpu(rx->value_len));
if (totlen != je32_to_cpu(rx->totlen)) {
JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n",
ofs, je32_to_cpu(rx->totlen), totlen);

303
fs/jffs2/xattr.c
View File

@ -50,12 +50,9 @@
* 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.
* delete_xattr_datum_delay(c, xd)
* is used to delete a xdatum without 'delete marker'. It has a possibility to detect
* orphan xdatum on next mounting.
* delete_xattr_datum(c, xd)
* is used to delete a xdatum with 'delete marker'. Calling jffs2_reserve_space() is
* necessary before this function.
* is used to delete a xdatum. It marks xd JFFS2_XFLAGS_DEAD, and allows
* GC to reclaim those physical nodes.
* -------------------------------------------------- */
static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize)
{
@ -154,10 +151,7 @@ static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_dat
xd->flags |= JFFS2_XFLAGS_INVALID;
return EIO;
}
totlen = sizeof(rx);
if (xd->version != XDATUM_DELETE_MARKER)
totlen += rx.name_len + 1 + je16_to_cpu(rx.value_len);
totlen = PAD(totlen);
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
@ -268,6 +262,7 @@ static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *x
*/
int rc = 0;
BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD);
if (xd->xname)
return 0;
if (xd->flags & JFFS2_XFLAGS_INVALID)
@ -285,20 +280,18 @@ static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *x
struct jffs2_raw_xattr rx;
struct kvec vecs[2];
size_t length;
int rc, totlen, nvecs = 1;
int rc, totlen;
uint32_t phys_ofs = write_ofs(c);
BUG_ON(is_xattr_datum_dead(xd) || (xd->flags & JFFS2_XFLAGS_INVALID)
? !!xd->xname : !xd->xname);
BUG_ON(!xd->xname);
BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID));
vecs[0].iov_base = &rx;
vecs[0].iov_len = totlen = sizeof(rx);
if (!is_xattr_datum_dead(xd) && !(xd->flags & JFFS2_XFLAGS_INVALID)) {
nvecs++;
vecs[1].iov_base = xd->xname;
vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
totlen += vecs[1].iov_len;
}
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);
@ -307,18 +300,14 @@ static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *x
rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
rx.xid = cpu_to_je32(xd->xid);
if (!is_xattr_datum_dead(xd) && !(xd->flags & JFFS2_XFLAGS_INVALID)) {
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));
} else {
rx.version = cpu_to_je32(XDATUM_DELETE_MARKER);
}
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, nvecs, phys_ofs, &length, 0);
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);
@ -405,53 +394,36 @@ static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
return xd;
}
static void delete_xattr_datum_delay(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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);
set_xattr_datum_dead(xd);
xd->flags |= JFFS2_XFLAGS_DEAD;
spin_lock(&c->erase_completion_lock);
list_add(&xd->xindex, &c->xattr_dead_list);
spin_unlock(&c->erase_completion_lock);
JFFS2_NOTICE("xdatum(xid=%u) was removed without delete marker. "
"An orphan xdatum may be detected on next mounting.\n", xd->xid);
}
static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
{
/* must be called under jffs2_reserve_space() and down_write(xattr_sem) */
int rc;
BUG_ON(xd->refcnt);
unload_xattr_datum(c, xd);
set_xattr_datum_dead(xd);
rc = save_xattr_datum(c, xd);
if (rc) {
JFFS2_NOTICE("xdatum(xid=%u) was removed without delete marker. "
"An orphan xdatum may be detected on next mounting.\n",
xd->xid);
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_lock(&c->erase_completion_lock);
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.
* 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)
@ -591,13 +563,13 @@ static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct
return ref; /* success */
}
static void delete_xattr_ref_delay(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
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;
set_xattr_ref_dead(ref);
xd = ref->xd;
ref->xseqno |= XREF_DELETE_MARKER;
ref->ino = ref->ic->ino;
ref->xid = ref->xd->xid;
spin_lock(&c->erase_completion_lock);
@ -605,102 +577,29 @@ static void delete_xattr_ref_delay(struct jffs2_sb_info *c, struct jffs2_xattr_r
c->xref_dead_list = ref;
spin_unlock(&c->erase_completion_lock);
JFFS2_NOTICE("xref(ino=%u, xid=%u) was removed without delete marker. "
"An orphan xref may be detected on next mounting.\n",
ref->ino, ref->xid);
dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",
ref->ino, ref->xid, ref->xseqno);
if (!--xd->refcnt)
delete_xattr_datum_delay(c, xd);
}
static int delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, int enforce)
{
/* must be called under jffs2_reserve_space() and down_write(xattr_sem) */
struct jffs2_inode_cache *ic;
struct jffs2_xattr_datum *xd;
uint32_t length;
int rc;
set_xattr_ref_dead(ref);
ic = ref->ic;
xd = ref->xd;
ref->ino = ic->ino;
ref->xid = xd->xid;
rc = save_xattr_ref(c, ref);
if (rc) {
if (!enforce) {
clr_xattr_ref_dead(ref);
ref->ic = ic;
ref->xd = xd;
return rc;
}
JFFS2_WARNING("could not write delete marker of xref(ino=%u, xid=%u). "
"An orphan xref may be detected on next mounting.\n",
ref->ic->ino, 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);
xd->refcnt--;
if (xd->refcnt)
return 0;
/* delete xdatum */
unload_xattr_datum(c, xd);
up_write(&c->xattr_sem);
jffs2_complete_reservation(c);
rc = jffs2_reserve_space(c, PAD(sizeof(struct jffs2_raw_xattr)), &length,
ALLOC_DELETION, JFFS2_SUMMARY_XATTR_SIZE);
if (rc) {
down(&c->alloc_sem);
down_write(&c->xattr_sem);
delete_xattr_datum_delay(c, xd);
} else {
down_write(&c->xattr_sem);
delete_xattr_datum(c, xd);
}
return 0;
}
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;
uint32_t length;
int rc, retry;
struct jffs2_xattr_ref *ref, *_ref;
if (!ic || ic->nlink > 0)
return;
down_read(&c->xattr_sem);
if (!ic->xref) {
up_read(&c->xattr_sem);
return;
}
up_read(&c->xattr_sem);
retry:
rc = jffs2_reserve_space(c, PAD(sizeof(struct jffs2_raw_xref)), &length,
ALLOC_DELETION, JFFS2_SUMMARY_XREF_SIZE);
down_write(&c->xattr_sem);
if (ic->xref) {
ref = ic->xref;
ic->xref = ref->next;
if (rc) {
delete_xattr_ref_delay(c, ref);
} else {
delete_xattr_ref(c, ref, 1);
}
for (ref = ic->xref; ref; ref = _ref) {
_ref = ref->next;
delete_xattr_ref(c, ref);
}
retry = ic->xref ? 1 : 0;
ic->xref = NULL;
up_write(&c->xattr_sem);
if (!rc)
jffs2_complete_reservation(c);
if (retry)
goto retry;
}
void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
@ -743,7 +642,7 @@ static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cac
rc = load_xattr_datum(c, ref->xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref_delay(c, ref);
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0))
goto out;
@ -755,7 +654,7 @@ static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cac
ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
if (unlikely(rc > 0)) {
*pcmp = cmp->next;
delete_xattr_ref_delay(c, cmp);
delete_xattr_ref(c, cmp);
goto retry;
} else if (unlikely(rc < 0))
goto out;
@ -764,10 +663,10 @@ static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cac
&& !strcmp(ref->xd->xname, cmp->xd->xname)) {
if (ref->xseqno > cmp->xseqno) {
*pcmp = cmp->next;
delete_xattr_ref_delay(c, cmp);
delete_xattr_ref(c, cmp);
} else {
*pref = ref->next;
delete_xattr_ref_delay(c, ref);
delete_xattr_ref(c, ref);
}
goto retry;
}
@ -865,20 +764,11 @@ void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
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 : Drop dead xdatum */
for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
BUG_ON(xd->node == (void *)xd);
if (is_xattr_datum_dead(xd)) {
list_del_init(&xd->xindex);
list_add(&xd->xindex, &c->xattr_unchecked);
}
}
}
/* Phase.2 : Merge same xref */
/* 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) {
@ -919,13 +809,15 @@ void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
}
c->xref_temp = NULL;
/* Phase.3 : Bind xref with inode_cache and xattr_datum */
/* 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.
@ -933,11 +825,12 @@ void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
xd = jffs2_find_xattr_datum(c, ref->xid);
ic = jffs2_get_ino_cache(c, ref->ino);
if (!xd || !ic) {
JFFS2_WARNING("xref(ino=%u, xid=%u, xseqno=%u) is orphan. \n",
ref->ino, ref->xid, ref->xseqno);
set_xattr_ref_dead(ref);
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;
@ -945,19 +838,20 @@ void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
xd->refcnt++;
ref->next = ic->xref;
ic->xref = ref;
xref_count++;
}
}
/* Phase.4 : Link unchecked xdatum to xattr_unchecked list */
/* 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) {
JFFS2_WARNING("orphan xdatum(xid=%u, version=%u)\n",
xd->xid, xd->version);
set_xattr_datum_dead(xd);
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)) {
@ -966,12 +860,14 @@ void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
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,
@ -1079,7 +975,7 @@ ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
rc = load_xattr_datum(c, xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref_delay(c, ref);
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0))
goto out;
@ -1140,7 +1036,7 @@ int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
rc = load_xattr_datum(c, xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref_delay(c, ref);
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0)) {
goto out;
@ -1203,7 +1099,7 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
rc = load_xattr_datum(c, xd);
if (unlikely(rc > 0)) {
*pref = ref->next;
delete_xattr_ref_delay(c, ref);
delete_xattr_ref(c, ref);
goto retry;
} else if (unlikely(rc < 0))
goto out;
@ -1214,8 +1110,23 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
goto out;
}
if (!buffer) {
*pref = ref->next;
rc = delete_xattr_ref(c, ref, 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);
if (!--xd->refcnt)
delete_xattr_datum(c, xd);
} else {
ref->ic = ic;
ref->xd = xd;
ref->xseqno &= ~XREF_DELETE_MARKER;
}
goto out;
}
goto found;
@ -1248,7 +1159,7 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
xd->refcnt--;
if (!xd->refcnt)
delete_xattr_datum_delay(c, xd);
delete_xattr_datum(c, xd);
up_write(&c->xattr_sem);
return rc;
}
@ -1263,21 +1174,9 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
rc = PTR_ERR(newref);
xd->refcnt--;
if (!xd->refcnt)
delete_xattr_datum_delay(c, xd);
delete_xattr_datum(c, xd);
} else if (ref) {
up_write(&c->xattr_sem);
jffs2_complete_reservation(c);
rc = jffs2_reserve_space(c, request, &length,
ALLOC_DELETION, JFFS2_SUMMARY_XREF_SIZE);
down_write(&c->xattr_sem);
if (rc) {
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
delete_xattr_ref_delay(c, ref);
up_write(&c->xattr_sem);
return 0;
}
delete_xattr_ref(c, ref, 1);
delete_xattr_ref(c, ref);
}
out:
up_write(&c->xattr_sem);
@ -1292,6 +1191,10 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
* 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)
@ -1302,18 +1205,17 @@ int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xatt
down_write(&c->xattr_sem);
if (xd->node != raw)
goto out;
if (is_xattr_datum_dead(xd) && (raw->next_in_ino == (void *)xd))
if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
goto out;
old_ofs = ref_offset(xd->node);
totlen = ref_totlen(c, c->gcblock, xd->node);
if (!is_xattr_datum_dead(xd)) {
rc = load_xattr_datum(c, xd);
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) {
JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
@ -1331,7 +1233,6 @@ int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xatt
return rc;
}
int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
struct jffs2_raw_node_ref *raw)
{
@ -1392,7 +1293,7 @@ int jffs2_verify_xattr(struct jffs2_sb_info *c)
raw->flash_offset = ref_offset(raw)
| ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
}
if (is_xattr_datum_dead(xd))
if (xd->flags & JFFS2_XFLAGS_DEAD)
list_add(&xd->xindex, &c->xattr_dead_list);
spin_unlock(&c->erase_completion_lock);
}
@ -1403,7 +1304,7 @@ int jffs2_verify_xattr(struct jffs2_sb_info *c)
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 (xd->node != (void *)xd)
if (xd->refcnt > 0 || xd->node != (void *)xd)
return;
list_del(&xd->xindex);
@ -1421,8 +1322,8 @@ void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *re
for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
if (ref == tmp) {
*ptmp = tmp->next;
jffs2_free_xattr_ref(ref);
break;
}
}
jffs2_free_xattr_ref(ref);
}

23
fs/jffs2/xattr.h
View File

@ -16,6 +16,7 @@
#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
#define JFFS2_XFLAGS_DEAD (0x40) /* This datum is already dead */
#define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */
struct jffs2_xattr_datum
@ -60,34 +61,12 @@ struct jffs2_xattr_ref
struct jffs2_xattr_ref *next; /* chained from ic->xref_list */
};
#define XDATUM_DELETE_MARKER (0xffffffff)
#define XREF_DELETE_MARKER (0x00000001)
static inline int is_xattr_datum_dead(struct jffs2_xattr_datum *xd)
{
return (xd->version == XDATUM_DELETE_MARKER);
}
static inline void set_xattr_datum_dead(struct jffs2_xattr_datum *xd)
{
xd->version = XDATUM_DELETE_MARKER;
}
static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
{
return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
}
static inline void set_xattr_ref_dead(struct jffs2_xattr_ref *ref)
{
ref->xseqno |= XREF_DELETE_MARKER;
}
static inline void clr_xattr_ref_dead(struct jffs2_xattr_ref *ref)
{
ref->xseqno &= ~XREF_DELETE_MARKER;
}
#ifdef CONFIG_JFFS2_FS_XATTR
extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);