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author | Hannes Reinecke <hare@suse.de> | 2016-10-18 15:40:34 +0900 |
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committer | Jens Axboe <axboe@fb.com> | 2016-10-18 19:49:11 -0600 |
commit | 89d9475610771b5e5fe1879075f0fc9ba6e3755f (patch) | |
tree | 249b9ee1a63ba8ea3bf865f2890efbce6948f1de /block/blk-zoned.c | |
parent | 3ed05a987e0f63b21e634101e0b460d32f3581c3 (diff) | |
download | linux-89d9475610771b5e5fe1879075f0fc9ba6e3755f.tar.bz2 |
sd: Implement support for ZBC devices
Implement ZBC support functions to setup zoned disks, both
host-managed and host-aware models. Only zoned disks that satisfy
the following conditions are supported:
1) All zones are the same size, with the exception of an eventual
last smaller runt zone.
2) For host-managed disks, reads are unrestricted (reads are not
failed due to zone or write pointer alignement constraints).
Zoned disks that do not satisfy these 2 conditions are setup with
a capacity of 0 to prevent their use.
The function sd_zbc_read_zones, called from sd_revalidate_disk,
checks that the device satisfies the above two constraints. This
function may also change the disk capacity previously set by
sd_read_capacity for devices reporting only the capacity of
conventional zones at the beginning of the LBA range (i.e. devices
reporting rc_basis set to 0).
The capacity message output was moved out of sd_read_capacity into
a new function sd_print_capacity to include this eventual capacity
change by sd_zbc_read_zones. This new function also includes a call
to sd_zbc_print_zones to display the number of zones and zone size
of the device.
Signed-off-by: Hannes Reinecke <hare@suse.de>
[Damien: * Removed zone cache support
* Removed mapping of discard to reset write pointer command
* Modified sd_zbc_read_zones to include checks that the
device satisfies the kernel constraints
* Implemeted REPORT ZONES setup and post-processing based
on code from Shaun Tancheff <shaun.tancheff@seagate.com>
* Removed confusing use of 512B sector units in functions
interface]
Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Tested-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-zoned.c')
0 files changed, 0 insertions, 0 deletions