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authorDuane Griffin <duaneg@dghda.com>2008-07-25 04:46:26 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 13:53:32 -0400
commit3ccc3167b0e5d46ab3bf03e22fbdb7616ce038cd (patch)
tree2dcd2ebb5ffa7271541d23e721101fca57a0eb33 /fs/ext3/inode.c
parent95450f5a7e53d5752ce1a0d0b8282e10fe745ae0 (diff)
ext3: handle deleting corrupted indirect blocks
While freeing indirect blocks we attach a journal head to the parent buffer head, free the blocks, then journal the parent. If the indirect block list is corrupted and points to the parent the journal head will be detached when the block is cleared, causing an OOPS. Check for that explicitly and handle it gracefully. This patch fixes the third case (image hdb.20000057.nullderef.gz) reported in http://bugzilla.kernel.org/show_bug.cgi?id=10882. Immediately above the change, in the ext3_free_data function, we call ext3_clear_blocks to clear the indirect blocks in this parent block. If one of those blocks happens to actually be the parent block it will clear b_private / BH_JBD. I did the check at the end rather than earlier as it seemed more elegant. I don't think there should be much practical difference, although it is possible the FS may not be quite so badly corrupted if we did it the other way (and didn't clear the block at all). To be honest, I'm not convinced there aren't other similar failure modes lurking in this code, although I couldn't find any with a quick review. [akpm@linux-foundation.org: fix printk warning] Signed-off-by: Duane Griffin <duaneg@dghda.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext3/inode.c')
-rw-r--r--fs/ext3/inode.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 36f74f17a11c..3bf07d70b914 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -2127,7 +2127,21 @@ static void ext3_free_data(handle_t *handle, struct inode *inode,
2127 2127
2128 if (this_bh) { 2128 if (this_bh) {
2129 BUFFER_TRACE(this_bh, "call ext3_journal_dirty_metadata"); 2129 BUFFER_TRACE(this_bh, "call ext3_journal_dirty_metadata");
2130 ext3_journal_dirty_metadata(handle, this_bh); 2130
2131 /*
2132 * The buffer head should have an attached journal head at this
2133 * point. However, if the data is corrupted and an indirect
2134 * block pointed to itself, it would have been detached when
2135 * the block was cleared. Check for this instead of OOPSing.
2136 */
2137 if (bh2jh(this_bh))
2138 ext3_journal_dirty_metadata(handle, this_bh);
2139 else
2140 ext3_error(inode->i_sb, "ext3_free_data",
2141 "circular indirect block detected, "
2142 "inode=%lu, block=%llu",
2143 inode->i_ino,
2144 (unsigned long long)this_bh->b_blocknr);
2131 } 2145 }
2132} 2146}
2133 2147