Commit b9dd4618 authored by Jin Qian's avatar Jin Qian Committed by Jaegeuk Kim
Browse files

f2fs: sanity check segment count 



F2FS uses 4 bytes to represent block address. As a result, supported
size of disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.

Signed-off-by: default avatarJin Qian <jinqian@google.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent a817737e

fs/f2fs/super.c

+7 −0
Original line number Diff line number Diff line
@@ -1494,6 +1494,13 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi, 
		return 1;

	}



	if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) {

		f2fs_msg(sb, KERN_INFO,

			"Invalid segment count (%u)",

			le32_to_cpu(raw_super->segment_count));

		return 1;

	}



	/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */

	if (sanity_check_area_boundary(sbi, bh))

		return 1;

include/linux/f2fs_fs.h

+6 −0
Original line number Diff line number Diff line
@@ -301,6 +301,12 @@ struct f2fs_nat_block { 
#define SIT_VBLOCK_MAP_SIZE 64

#define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))



/*

 * F2FS uses 4 bytes to represent block address. As a result, supported size of

 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.

 */

#define F2FS_MAX_SEGMENT       ((16 * 1024 * 1024) / 2)



/*

 * Note that f2fs_sit_entry->vblocks has the following bit-field information.

 * [15:10] : allocation type such as CURSEG_XXXX_TYPE

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