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334b4fc172
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3 Commits

Author SHA1 Message Date
Mikulas Patocka
334b4fc172 dm ebs: use dm_bufio_forget_buffers 
Use dm_bufio_forget_buffers instead of a block-by-block loop that
calls dm_bufio_forget. dm_bufio_forget_buffers is faster than the loop
because it searches for used buffers using rb-tree.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2020-06-05 14:59:42 -04:00
Heinz Mauelshagen
a5089a95d8 dm ebs: pass discards down to underlying device 
Make use of dm_bufio_issue_discard() to pass discards down to the
underlying device.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2020-05-15 10:29:35 -04:00
Heinz Mauelshagen
d3c7b35c20 dm: add emulated block size target 
This new target is similar to the linear target except that it emulates
a smaller logical block size on a device with a larger logical block
size.  Its main purpose is to emulate 512 byte sectors on 4K native
disks (i.e. 512e).

See Documentation/admin-guide/device-mapper/dm-ebs.rst for details.

Reviewed-by: Damien Le Moal <DamienLeMoal@wdc.com>
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org> [Kconfig fixes]
Signed-off-by: Zheng Bin <zhengbin13@huawei.com> [static fixes]
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2020-05-15 10:29:35 -04:00