[JFFS2] Fix inode allocation race
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/fs/jffs2/README.Locking b/fs/jffs2/README.Locking
index 49771cf..b7943439 100644
--- a/fs/jffs2/README.Locking
+++ b/fs/jffs2/README.Locking
@@ -1,4 +1,4 @@
- $Id: README.Locking,v 1.9 2004/11/20 10:35:40 dwmw2 Exp $
+ $Id: README.Locking,v 1.12 2005/04/13 13:22:35 dwmw2 Exp $
JFFS2 LOCKING DOCUMENTATION
---------------------------
@@ -108,6 +108,10 @@
correspondent jffs2_inode_cache object). So, the inocache_lock
has to be locked while walking the c->inocache_list hash buckets.
+This spinlock also covers allocation of new inode numbers, which is
+currently just '++->highest_ino++', but might one day get more complicated
+if we need to deal with wrapping after 4 milliard inode numbers are used.
+
Note, the f->sem guarantees that the correspondent jffs2_inode_cache
will not be removed. So, it is allowed to access it without locking
the inocache_lock spinlock.
diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c
index b835a86..c9157e1 100644
--- a/fs/jffs2/nodelist.c
+++ b/fs/jffs2/nodelist.c
@@ -7,7 +7,7 @@
*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: nodelist.c,v 1.93 2005/02/27 23:01:32 dwmw2 Exp $
+ * $Id: nodelist.c,v 1.94 2005/04/13 13:22:35 dwmw2 Exp $
*
*/
@@ -491,6 +491,10 @@
struct jffs2_inode_cache **prev;
D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino));
spin_lock(&c->inocache_lock);
+ if (!new->ino)
+ new->ino = ++c->highest_ino;
+
+ D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino));
prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE];
diff --git a/fs/jffs2/write.c b/fs/jffs2/write.c
index f3910dc..6910061 100644
--- a/fs/jffs2/write.c
+++ b/fs/jffs2/write.c
@@ -7,7 +7,7 @@
*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: write.c,v 1.91 2005/03/01 10:34:03 dedekind Exp $
+ * $Id: write.c,v 1.92 2005/04/13 13:22:35 dwmw2 Exp $
*
*/
@@ -35,13 +35,12 @@
f->inocache = ic;
f->inocache->nlink = 1;
f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;
- f->inocache->ino = ++c->highest_ino;
f->inocache->state = INO_STATE_PRESENT;
- ri->ino = cpu_to_je32(f->inocache->ino);
- D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino));
jffs2_add_ino_cache(c, f->inocache);
+ D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino));
+ ri->ino = cpu_to_je32(f->inocache->ino);
ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);