On 7/19/16 22:25, Hannes Reinecke wrote:
Implement ZBC support functions to read in the zone information
and setup the zone tree.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/Kconfig | 8 +
drivers/scsi/Makefile | 1 +
drivers/scsi/sd.c | 129 ++++++------
drivers/scsi/sd.h | 54 +++++
drivers/scsi/sd_zbc.c | 538 ++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 670 insertions(+), 60 deletions(-)
create mode 100644 drivers/scsi/sd_zbc.c
[...]
+/**
+ * sd_zbc_update_zones - Update zone information for @sector
+ * @sdkp: SCSI disk for which the zone information needs to be updated
+ * @sector: sector to be updated
+ * @bufsize: buffersize to be allocated
+ * @update: true if existing zones should be updated
+ */
+void sd_zbc_update_zones(struct scsi_disk *sdkp, sector_t sector, int bufsize,
+ bool update)
+{
+ struct request_queue *q = sdkp->disk->queue;
+ struct zbc_update_work *zbc_work;
+ struct blk_zone *zone;
+ struct rb_node *node;
+ int zone_num = 0, zone_busy = 0, num_rec;
+ sector_t next_sector = sector;
+
+ if (test_bit(SD_ZBC_ZONE_RESET, &sdkp->zone_flags)) {
+ sd_zbc_debug(sdkp,
+ "zones in reset, not starting update\n");
+ return;
+ }
+
+retry:
+ zbc_work = kzalloc(sizeof(struct zbc_update_work) + bufsize,
+ update ? GFP_NOWAIT : GFP_KERNEL);
Christoph suggested that GFP_ATOMIC is more appropriate here instead of
GFP_NOWAIT.
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxx>
Tested-by: Damien Le Moal <damien.lemoal@xxxxxxxx>
--
Damien Le Moal, Ph.D.
Sr. Manager, System Software Group, HGST Research,
HGST, a Western Digital brand
Damien.LeMoal@xxxxxxxx
(+81) 0466-98-3593 (ext. 513593)
1 kirihara-cho, Fujisawa,
Kanagawa, 252-0888 Japan
www.hgst.com
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