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BACKPORT: f2fs: Restrict max filesize for 16K f2fs

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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: cf46c5872022 ("BACKPORT: Support Block Size == Page Size")
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Change-Id: I8697e37841e1882a3f613e9aab1857ad7e4c3f2f
Bug: 248132568
(cherry picked from commit a6a010f5def544af3efcfe21683905a712b60536)
This commit is contained in:
Daniel Rosenberg 2023-12-01 17:05:40 -08:00
parent 8c8bcbdf0b
commit 6338e41509
1 changed files with 8 additions and 0 deletions
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8
fs/f2fs/super.c
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@ -3266,6 +3266,14 @@ 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;
}