6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mikulas Patocka mpatocka@redhat.com
commit d0ac06ae53be0cdb61f5fe6b62d25d3317c51657 upstream.
There may be devices with physical block size larger than 4k.
If dm-bufio sends I/O that is not aligned on physical block size, performance is degraded.
The 4k minimum alignment limit is there because some SSDs report logical and physical block size 512 despite having 4k internally - so dm-bufio shouldn't send I/Os not aligned on 4k boundary, because they perform badly (the SSD does read-modify-write for them).
Signed-off-by: Mikulas Patocka mpatocka@redhat.com Reported-by: Uladzislau Rezki (Sony) urezki@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/dm-bufio.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
--- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -1375,7 +1375,7 @@ static void submit_io(struct dm_buffer * { unsigned int n_sectors; sector_t sector; - unsigned int offset, end; + unsigned int offset, end, align;
b->end_io = end_io;
@@ -1389,9 +1389,11 @@ static void submit_io(struct dm_buffer * b->c->write_callback(b); offset = b->write_start; end = b->write_end; - offset &= -DM_BUFIO_WRITE_ALIGN; - end += DM_BUFIO_WRITE_ALIGN - 1; - end &= -DM_BUFIO_WRITE_ALIGN; + align = max(DM_BUFIO_WRITE_ALIGN, + bdev_physical_block_size(b->c->bdev)); + offset &= -align; + end += align - 1; + end &= -align; if (unlikely(end > b->c->block_size)) end = b->c->block_size;