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[JFFS2] Check whether garbage-collection actually obsoleted its victim. 

In OLPC trac #4184 we found a case where a corrupted node didn't
actually get obsoleted when we tried to garbage-collect it. So we wrote
out many million copies of it, in repeated attempts to obsolete it,
until the flash became full. Don't Do That.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2007-10-13 11:31:23 +01:00
parent 85becc535b
commit 2665ea842d
1 changed files with 12 additions and 2 deletions
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14
fs/jffs2/gc.c
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@ -122,6 +122,7 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
struct jffs2_inode_cache *ic;
struct jffs2_eraseblock *jeb;
struct jffs2_raw_node_ref *raw;
uint32_t gcblock_dirty;
int ret = 0, inum, nlink;
int xattr = 0;
@ -236,6 +237,7 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
}
raw = jeb->gc_node;
gcblock_dirty = jeb->dirty_size;
while(ref_obsolete(raw)) {
D1(printk(KERN_DEBUG "Node at 0x%08x is obsolete... skipping\n", ref_offset(raw)));
@ -282,7 +284,7 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
} else {
ret = jffs2_garbage_collect_xattr_ref(c, (struct jffs2_xattr_ref *)ic, raw);
}
goto release_sem;
goto test_gcnode;
}
#endif
@ -376,7 +378,7 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
if (ret != -EBADFD) {
spin_unlock(&c->inocache_lock);
goto release_sem;
goto test_gcnode;
}
/* Fall through if it wanted us to, with inocache_lock held */
@ -407,6 +409,14 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
jffs2_gc_release_inode(c, f);
test_gcnode:
if (jeb->dirty_size == gcblock_dirty && !ref_obsolete(jeb->gc_node)) {
/* Eep. This really should never happen. GC is broken */
printk(KERN_ERR "Error garbage collecting node at %08x!\n", ref_offset(jeb->gc_node));
ret = -ENOSPC;
} else if (ref_offset(jeb->gc_node) == 0x1c616bdc)
printk(KERN_ERR "Wheee. Correctly GC'd node at %08x\n", ref_offset(jeb->gc_node));
release_sem:
up(&c->alloc_sem);