md: Don't truncate size at 4TB for RAID0 and Linear (667a5313) · Commits · 戴 / test

commit md: Fix handling for devices from 2TB to 4TB in 0.90 metadata. changed 0.90 metadata handling to truncated size to 4TB as that is all that 0.90 can record. However for RAID0 and Linear, 0.90 doesn't need to record the size, so this truncation is not needed and causes working arrays to become too small. So avoid the truncation for RAID0 and Linear This bug was introduced in 3.1 and is suitable for any stable kernels from then onwards. As the offending commit was tagged for 'stable', any stable kernel that it was applied to should also get this patch. That includes at least 2.6.32, 2.6.33 and 3.0. (Thanks to Ben Hutchings for providing that list). Cc: stable@vger.kernel.org Signed-off-by:

Neil Brown <neilb@suse.de>

drivers/md/md.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -1108,8 +1108,11 @@ static int super_90_load(struct md_rdev rdev, struct md_rdev refdev, int minor
		ret = 0;
		}
		rdev->sectors = rdev->sb_start;
		/* Limit to 4TB as metadata cannot record more than that */
		if (rdev->sectors >= (2ULL << 32))
		/* Limit to 4TB as metadata cannot record more than that.
		* (not needed for Linear and RAID0 as metadata doesn't
		* record this size)
		*/
		if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
		rdev->sectors = (2ULL << 32) - 2;

		if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
		@@ -1400,7 +1403,7 @@ super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
		/* Limit to 4TB as metadata cannot record more than that.
		* 4TB == 2^32 KB, or 2*2^32 sectors.
		*/
		if (num_sectors >= (2ULL << 32))
		if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
		num_sectors = (2ULL << 32) - 2;
		md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
		rdev->sb_page);

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