Currently we just ensure that a non-zero value in chunk_sectors aligns
with any atomic write boundary, as the blk boundary functionality uses
both these values.
However it is also improper to have atomic write unit max > chunk_sectors
(for non-zero chunk_sectors), as this would lead to splitting of atomic
write bios (which is disallowed).
Sanitize atomic write unit max against chunk_sectors to avoid any
potential problems.
Fixes: d00eea91deaf3 ("block: Add extra checks in blk_validate_atomic_write_limits()")
Reviewed-by: Nilay Shroff <nilay@xxxxxxxxxxxxx>
Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
block/blk-settings.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/blk-settings.c b/block/blk-settings.c
index a000daafbfb48..a2c089167174e 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -180,6 +180,7 @@ static void blk_atomic_writes_update_limits(struct queue_limits *lim)
static void blk_validate_atomic_write_limits(struct queue_limits *lim)
{
+ unsigned long long chunk_bytes = lim->chunk_sectors << SECTOR_SHIFT;
unsigned int boundary_sectors;
if (!(lim->features & BLK_FEAT_ATOMIC_WRITES))
@@ -202,6 +203,10 @@ static void blk_validate_atomic_write_limits(struct queue_limits *lim)
lim->atomic_write_hw_max))
goto unsupported;
+ if (WARN_ON_ONCE(chunk_bytes &&
+ lim->atomic_write_hw_unit_max > chunk_bytes))
+ goto unsupported;
+
boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;
if (boundary_sectors) {
--
2.43.5
