From 131294c35ed6f777bd4e79d42af13b5c41bf2775 Mon Sep 17 00:00:00 2001
From: Eric Whitney <enwlinux@gmail.com>
Date: Thu, 17 Nov 2022 10:22:07 -0500
Subject: [PATCH] ext4: fix delayed allocation bug in ext4_clu_mapped for
bigalloc + inline
Git-commit: 131294c35ed6f777bd4e79d42af13b5c41bf2775
Patch-mainline: v6.2-rc1
References: bsc#1207631
When converting files with inline data to extents, delayed allocations
made on a file system created with both the bigalloc and inline options
can result in invalid extent status cache content, incorrect reserved
cluster counts, kernel memory leaks, and potential kernel panics.
With bigalloc, the code that determines whether a block must be
delayed allocated searches the extent tree to see if that block maps
to a previously allocated cluster. If not, the block is delayed
allocated, and otherwise, it isn't. However, if the inline option is
also used, and if the file containing the block is marked as able to
store data inline, there isn't a valid extent tree associated with
the file. The current code in ext4_clu_mapped() calls
ext4_find_extent() to search the non-existent tree for a previously
allocated cluster anyway, which typically finds nothing, as desired.
However, a side effect of the search can be to cache invalid content
from the non-existent tree (garbage) in the extent status tree,
including bogus entries in the pending reservation tree.
To fix this, avoid searching the extent tree when allocating blocks
for bigalloc + inline files that are being converted from inline to
extent mapped.
Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Link: https://lore.kernel.org/r/20221117152207.2424-1-enwlinux@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Acked-by: Jan Kara <jack@suse.cz>
---
fs/ext4/extents.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ec008278d970..9de1c9d1a13d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5797,6 +5797,14 @@ int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu)
struct ext4_extent *extent;
ext4_lblk_t first_lblk, first_lclu, last_lclu;
+ /*
+ * if data can be stored inline, the logical cluster isn't
+ * mapped - no physical clusters have been allocated, and the
+ * file has no extents
+ */
+ if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
+ return 0;
+
/* search for the extent closest to the first block in the cluster */
path = ext4_find_extent(inode, EXT4_C2B(sbi, lclu), NULL, 0);
if (IS_ERR(path)) {
--
2.35.3