From a6a010f5def544af3efcfe21683905a712b60536 Mon Sep 17 00:00:00 2001 From: Daniel Rosenberg Date: Mon, 4 Dec 2023 18:38:01 -0800 Subject: f2fs: Restrict max filesize for 16K f2fs 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 Signed-off-by: Jaegeuk Kim --- fs/f2fs/super.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'fs/f2fs') diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 9a874b4d1501..206d03c82d96 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -3359,6 +3359,14 @@ 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; } -- cgit