[JFFS2] Handle inodes with only a single metadata node with non-zero isize
This should never happen unless there's corruption on the medium and the
actual data nodes go missing. But the failure mode (an oops when we assume
the fragtree isn't empty and go looking for its last node) isn't useful.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index a42ffba..6aff389 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -1132,7 +1132,7 @@
struct jffs2_raw_inode *latest_node)
{
struct jffs2_readinode_info rii;
- uint32_t crc;
+ uint32_t crc, new_size;
size_t retlen;
int ret;
@@ -1233,7 +1233,12 @@
case S_IFREG:
/* If it was a regular file, truncate it to the latest node's isize */
- jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize));
+ new_size = jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize));
+ if (new_size != je32_to_cpu(latest_node->isize)) {
+ JFFS2_WARNING("Truncating ino #%u to %d bytes failed because it only had %d bytes to start with!\n",
+ f->inocache->ino, je32_to_cpu(latest_node->isize), new_size);
+ latest_node->isize = cpu_to_je32(new_size);
+ }
break;
case S_IFLNK: