This is a note to let you know that I've just added the patch titled
f2fs: Restrict max filesize for 16K f2fs
to the 6.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
f2fs-restrict-max-filesize-for-16k-f2fs.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 04968e4208cf783ddb86f30c8bf56be3088bba20
Author: Daniel Rosenberg <drosen@xxxxxxxxxx>
Date: Mon Dec 4 18:38:01 2023 -0800
f2fs: Restrict max filesize for 16K f2fs
[ Upstream commit a6a010f5def544af3efcfe21683905a712b60536 ]
Blocks are tracked by u32, so the max permitted filesize is
(U32_MAX + 1) * BLOCK_SIZE. Additionally, in order to support crypto
data unit sizes of 4K with a 16K block with IV_INO_LBLK_{32,64}, we must
further restrict max filesize to (U32_MAX + 1) * 4096. This does not
affect 4K blocksize f2fs as the natural limit for files are well below
that.
Fixes: d7e9a9037de2 ("f2fs: Support Block Size == Page Size")
Signed-off-by: Daniel Rosenberg <drosen@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 033af907c3b1..5dfbc6b4c0ac 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3364,6 +3364,14 @@ loff_t max_file_blocks(struct inode *inode)
leaf_count *= NIDS_PER_BLOCK;
result += leaf_count;
+ /*
+ * For compatibility with FSCRYPT_POLICY_FLAG_IV_INO_LBLK_{64,32} with
+ * a 4K crypto data unit, we must restrict the max filesize to what can
+ * fit within U32_MAX + 1 data units.
+ */
+
+ result = min(result, (((loff_t)U32_MAX + 1) * 4096) >> F2FS_BLKSIZE_BITS);
+
return result;
}
