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authorKaiGai Kohei <kaigai@ak.jp.nec.com>2006-06-29 18:33:02 +0400
committerDavid Woodhouse <dwmw2@infradead.org>2006-06-29 18:33:02 +0400
commitc6e8c6ccf96e9249805d0e9828b994f4c926ad51 (patch)
tree0db9c602c20a94d9afbd555a131805de60e75ed2 /fs/jffs2/xattr.c
parentea9b6dcc152f09c207117ab121d4fa03d2db282a (diff)
downloadlinux-c6e8c6ccf96e9249805d0e9828b994f4c926ad51.tar.xz
[JFFS2][XATTR] Fix xd->refcnt race condition
When xd->refcnt is checked whether this xdatum should be released or not, atomic_dec_and_lock() is used to ensure holding the c->erase_completion_lock. This fix change a specification of delete_xattr_datum(). Previously, it's only called when xd->refcnt equals zero. (calling it with positive xd->refcnt cause a BUG()) If you applied this patch, the function checks whether xd->refcnt is zero or not under the spinlock if necessary. Then, it marks xd DEAD flahs and links with xattr_dead_list or releases it immediately when xd->refcnt become zero. Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'fs/jffs2/xattr.c')
-rw-r--r--fs/jffs2/xattr.c45
1 files changed, 22 insertions, 23 deletions
diff --git a/fs/jffs2/xattr.c b/fs/jffs2/xattr.c
index 18e66dbf23b4..25bc1ae08648 100644
--- a/fs/jffs2/xattr.c
+++ b/fs/jffs2/xattr.c
@@ -50,9 +50,10 @@
* 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(c, xd)
- * is used to delete a xdatum. It marks xd JFFS2_XFLAGS_DEAD, and allows
- * GC to reclaim those physical nodes.
+ * 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)
{
@@ -394,22 +395,24 @@ static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
return xd;
}
-static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
+static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
{
/* must be called under down_write(xattr_sem) */
- BUG_ON(atomic_read(&xd->refcnt));
+ 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;
- spin_lock(&c->erase_completion_lock);
- 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);
+ 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);
}
- spin_unlock(&c->erase_completion_lock);
- dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", xd->xid, xd->version);
}
/* -------- xref related functions ------------------
@@ -580,8 +583,7 @@ static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *re
dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",
ref->ino, ref->xid, ref->xseqno);
- if (atomic_dec_and_test(&xd->refcnt))
- delete_xattr_datum(c, xd);
+ unrefer_xattr_datum(c, xd);
}
void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
@@ -1119,8 +1121,7 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
ref->next = c->xref_dead_list;
c->xref_dead_list = ref;
spin_unlock(&c->erase_completion_lock);
- if (atomic_dec_and_test(&xd->refcnt))
- delete_xattr_datum(c, xd);
+ unrefer_xattr_datum(c, xd);
} else {
ref->ic = ic;
ref->xd = xd;
@@ -1156,8 +1157,7 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
down_write(&c->xattr_sem);
if (rc) {
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
- if (atomic_dec_and_test(&xd->refcnt))
- delete_xattr_datum(c, xd);
+ unrefer_xattr_datum(c, xd);
up_write(&c->xattr_sem);
return rc;
}
@@ -1170,8 +1170,7 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
ic->xref = ref;
}
rc = PTR_ERR(newref);
- if (atomic_dec_and_test(&xd->refcnt))
- delete_xattr_datum(c, xd);
+ unrefer_xattr_datum(c, xd);
} else if (ref) {
delete_xattr_ref(c, ref);
}