diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2022-02-18 05:40:32 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2022-02-21 21:36:33 +0100 |
| commit | 0fbb4d93b38bce1f8235aacfa37e90ad8f011473 (patch) | |
| tree | 0e952a46f944ff4559ebfd5d0579b1d766ef54cb /include/uapi | |
| parent | dm: flag clones created by __send_duplicate_bios (diff) | |
| download | linux-0fbb4d93b38bce1f8235aacfa37e90ad8f011473.tar.xz linux-0fbb4d93b38bce1f8235aacfa37e90ad8f011473.zip | |
dm: add dm_submit_bio_remap interface
Where possible, switch from early bio-based IO accounting (at the time
DM clones each incoming bio) to late IO accounting just before each
remapped bio is issued to underlying device via submit_bio_noacct().
Allows more precise bio-based IO accounting for DM targets that use
their own workqueues to perform additional processing of each bio in
conjunction with their DM_MAPIO_SUBMITTED return from their map
function. When a target is updated to use dm_submit_bio_remap() they
must also set ti->accounts_remapped_io to true.
Use xchg() in start_io_acct(), as suggested by Mikulas, to ensure each
IO is only started once. The xchg race only happens if
__send_duplicate_bios() sends multiple bios -- that case is reflected
via tio->is_duplicate_bio. Given the niche nature of this race, it is
best to avoid any xchg performance penalty for normal IO.
For IO that was never submitted with dm_bio_submit_remap(), but the
target completes the clone with bio_endio, accounting is started then
ended and pending_io counter decremented.
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/dm-ioctl.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h index c12ce30b52df..2e9550fef90f 100644 --- a/include/uapi/linux/dm-ioctl.h +++ b/include/uapi/linux/dm-ioctl.h @@ -286,9 +286,9 @@ enum { #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl) #define DM_VERSION_MAJOR 4 -#define DM_VERSION_MINOR 45 +#define DM_VERSION_MINOR 46 #define DM_VERSION_PATCHLEVEL 0 -#define DM_VERSION_EXTRA "-ioctl (2021-03-22)" +#define DM_VERSION_EXTRA "-ioctl (2022-02-22)" /* Status bits */ #define DM_READONLY_FLAG (1 << 0) /* In/Out */ |