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Commit 5c211caa authored by Alan Stern's avatar Alan Stern Committed by James Bottomley
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[SCSI] sd: tell the user when a disk's capacity is adjusted 



This patch (as1188) combines the tests for decrementing a drive's
reported capacity and expands the comment.  It also adds an
informational message to the system log, informing the user when the
reported value has been changed.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent b3f1f9aa

drivers/scsi/sd.c

+15 −11
Original line number Diff line number Diff line
@@ -1383,17 +1383,21 @@ repeat: 
		sd_read_protection_type(sdkp, buffer);

	}	



	/* Some devices return the total number of sectors, not the

	 * highest sector number.  Make the necessary adjustment. */

	if (sdp->fix_capacity) {

		--sdkp->capacity;



	/* Some devices have version which report the correct sizes

	 * and others which do not. We guess size according to a heuristic

	 * and err on the side of lowering the capacity. */

	} else {

		if (sdp->guess_capacity)

			if (sdkp->capacity & 0x01) /* odd sizes are odd */

	/* Some devices are known to return the total number of blocks,

	 * not the highest block number.  Some devices have versions

	 * which do this and others which do not.  Some devices we might

	 * suspect of doing this but we don't know for certain.

	 *

	 * If we know the reported capacity is wrong, decrement it.  If

	 * we can only guess, then assume the number of blocks is even

	 * (usually true but not always) and err on the side of lowering

	 * the capacity.

	 */

	if (sdp->fix_capacity ||

	    (sdp->guess_capacity && (sdkp->capacity & 0x01))) {

		sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "

				"from its reported value: %llu\n",

				(unsigned long long) sdkp->capacity);

		--sdkp->capacity;

	}