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Commit 3f0531e5 authored by Jin Qian's avatar Jin Qian
Browse files

BACKPORT: f2fs: sanity check log_blocks_per_seg 



f2fs currently only supports 4KB block size and 2MB segment size.
Sanity check log_blocks_per_seg == 9, i.e. 2MB/4KB = (1 << 9)

Partially
(cherry-picked from commit 9a59b62fd88196844cee5fff851bee2cfd7afb6e)

f2fs: do more integrity verification for superblock
    
Do more sanity check for superblock during ->mount.
    
Signed-off-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>

Bug: 36817013
Change-Id: I0be52e54fba82083068337ceb9f7ad985a87319f
Signed-off-by: default avatarJin Qian <jinqian@google.com>
parent e9cf0f69

fs/f2fs/super.c

+8 −0
Original line number Diff line number Diff line
@@ -947,6 +947,14 @@ static int sanity_check_raw_super(struct super_block *sb, 
		return 1;

	}



	/* check log blocks per segment */

	if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {

		f2fs_msg(sb, KERN_INFO,

			"Invalid log blocks per segment (%u)\n",

			le32_to_cpu(raw_super->log_blocks_per_seg));

		return 1;

	}



	/* Currently, support 512/1024/2048/4096 bytes sector size */

	if (le32_to_cpu(raw_super->log_sectorsize) >

				F2FS_MAX_LOG_SECTOR_SIZE ||