diff mbox series

[v2,1/5] block: Add extra checks in blk_validate_atomic_write_limits()

Message ID 20241030094912.3960234-2-john.g.garry@oracle.com (mailing list archive)
State Superseded
Headers show
Series RAID 0/1/10 atomic write support | expand

Commit Message

John Garry Oct. 30, 2024, 9:49 a.m. UTC 
It is so far expected that the limits passed are valid.

In future atomic writes will be supported for stacked block devices, and
calculating the limits there will be complicated, so add extra sanity
checks to ensure that the values are always valid.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 block/blk-settings.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Comments

Christoph Hellwig Oct. 30, 2024, 1:47 p.m. UTC | #1 
Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/block/blk-settings.c b/block/blk-settings.c
index a446654ddee5..1642e65a6521 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -179,9 +179,26 @@  static void blk_validate_atomic_write_limits(struct queue_limits *lim)
 	if (!lim->atomic_write_hw_max)
 		goto unsupported;
 
+	if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_min)))
+		goto unsupported;
+
+	if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_max)))
+		goto unsupported;
+
+	if (WARN_ON_ONCE(lim->atomic_write_hw_unit_min >
+			 lim->atomic_write_hw_unit_max))
+		goto unsupported;
+
+	if (WARN_ON_ONCE(lim->atomic_write_hw_unit_max >
+			 lim->atomic_write_hw_max))
+		goto unsupported;
+
 	boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;
 
 	if (boundary_sectors) {
+		if (WARN_ON_ONCE(lim->atomic_write_hw_max >
+				 lim->atomic_write_hw_boundary))
+			goto unsupported;
 		/*
 		 * A feature of boundary support is that it disallows bios to
 		 * be merged which would result in a merged request which