[PATCH] block: allow device to have both virt_boundary_mask and max segment size

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



When one stacking device is over one device with virt_boundary_mask and
another one with max segment size, the stacking device have both limits
set. This way is allowed before d690cb8ae14b ("block: add an API to
atomically update queue limits").

Relax the limit so that we won't break such kind of stacking setting.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218687
Reported-by: janpieter.sollie@xxxxxxxxx
Fixes: d690cb8ae14b ("block: add an API to atomically update queue limits")
Link: https://lore.kernel.org/linux-block/ZfGl8HzUpiOxCLm3@fedora/
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: dm-devel@xxxxxxxxxxxxxxx
Cc: Song Liu <song@xxxxxxxxxx>
Cc: linux-raid@xxxxxxxxxxxxxxx
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
 block/blk-settings.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index cdbaef159c4b..d2731843f2fc 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -182,17 +182,13 @@ static int blk_validate_limits(struct queue_limits *lim)
 		return -EINVAL;
 
 	/*
-	 * Devices that require a virtual boundary do not support scatter/gather
-	 * I/O natively, but instead require a descriptor list entry for each
-	 * page (which might not be identical to the Linux PAGE_SIZE).  Because
-	 * of that they are not limited by our notion of "segment size".
+	 * Stacking device may have both virtual boundary and max segment
+	 * size limit, so allow this setting now, and long-term the two
+	 * might need to move out of stacking limits since we have immutable
+	 * bvec and lower layer bio splitting is supposed to handle the two
+	 * correctly.
 	 */
-	if (lim->virt_boundary_mask) {
-		if (WARN_ON_ONCE(lim->max_segment_size &&
-				 lim->max_segment_size != UINT_MAX))
-			return -EINVAL;
-		lim->max_segment_size = UINT_MAX;
-	} else {
+	if (!lim->virt_boundary_mask) {
 		/*
 		 * The maximum segment size has an odd historic 64k default that
 		 * drivers probably should override.  Just like the I/O size we
-- 
2.41.0





[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux