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author | Damien Le Moal <damien.lemoal@wdc.com> | 2017-12-21 15:43:43 +0900 |
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committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-01-08 22:13:19 -0500 |
commit | 23349ca93aed05917d9178d0a9e21db599a0eb5d (patch) | |
tree | 43b6a13502a3d51f22b5f48038c20c5b4679c915 /drivers/scsi/sd_zbc.c | |
parent | 2ee4e9ce594b7c4dae5102fa86ce6339b98a4bc8 (diff) | |
download | linux-23349ca93aed05917d9178d0a9e21db599a0eb5d.tar.gz linux-23349ca93aed05917d9178d0a9e21db599a0eb5d.tar.bz2 linux-23349ca93aed05917d9178d0a9e21db599a0eb5d.zip |
scsi: sd_zbc: Initialize device request queue zoned data
Initialize the seq_zones_bitmap, seq_zones_wlock and nr_zones fields of
the disk request queue on disk revalidate. As the seq_zones_bitmap and
seq_zones_wlock allocations are identical, introduce the helper
sd_zbc_alloc_zone_bitmap(). Using this helper, reallocate the bitmaps
whenever the disk capacity (number of zones) changes.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/sd_zbc.c')
-rw-r--r-- | drivers/scsi/sd_zbc.c | 152 |
1 files changed, 144 insertions, 8 deletions
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 27793b9f54c0..c715b8363ce0 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -586,8 +586,123 @@ out: return 0; } +/** + * sd_zbc_alloc_zone_bitmap - Allocate a zone bitmap (one bit per zone). + * @sdkp: The disk of the bitmap + */ +static inline unsigned long *sd_zbc_alloc_zone_bitmap(struct scsi_disk *sdkp) +{ + struct request_queue *q = sdkp->disk->queue; + + return kzalloc_node(BITS_TO_LONGS(sdkp->nr_zones) + * sizeof(unsigned long), + GFP_KERNEL, q->node); +} + +/** + * sd_zbc_get_seq_zones - Parse report zones reply to identify sequential zones + * @sdkp: disk used + * @buf: report reply buffer + * @seq_zone_bitamp: bitmap of sequential zones to set + * + * Parse reported zone descriptors in @buf to identify sequential zones and + * set the reported zone bit in @seq_zones_bitmap accordingly. + * Since read-only and offline zones cannot be written, do not + * mark them as sequential in the bitmap. + * Return the LBA after the last zone reported. + */ +static sector_t sd_zbc_get_seq_zones(struct scsi_disk *sdkp, unsigned char *buf, + unsigned int buflen, + unsigned long *seq_zones_bitmap) +{ + sector_t lba, next_lba = sdkp->capacity; + unsigned int buf_len, list_length; + unsigned char *rec; + u8 type, cond; + + list_length = get_unaligned_be32(&buf[0]) + 64; + buf_len = min(list_length, buflen); + rec = buf + 64; + + while (rec < buf + buf_len) { + type = rec[0] & 0x0f; + cond = (rec[1] >> 4) & 0xf; + lba = get_unaligned_be64(&rec[16]); + if (type != ZBC_ZONE_TYPE_CONV && + cond != ZBC_ZONE_COND_READONLY && + cond != ZBC_ZONE_COND_OFFLINE) + set_bit(lba >> sdkp->zone_shift, seq_zones_bitmap); + next_lba = lba + get_unaligned_be64(&rec[8]); + rec += 64; + } + + return next_lba; +} + +/** + * sd_zbc_setup_seq_zones_bitmap - Initialize the disk seq zone bitmap. + * @sdkp: target disk + * + * Allocate a zone bitmap and initialize it by identifying sequential zones. + */ +static int sd_zbc_setup_seq_zones_bitmap(struct scsi_disk *sdkp) +{ + struct request_queue *q = sdkp->disk->queue; + unsigned long *seq_zones_bitmap; + sector_t lba = 0; + unsigned char *buf; + int ret = -ENOMEM; + + seq_zones_bitmap = sd_zbc_alloc_zone_bitmap(sdkp); + if (!seq_zones_bitmap) + return -ENOMEM; + + buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL); + if (!buf) + goto out; + + while (lba < sdkp->capacity) { + ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, lba); + if (ret) + goto out; + lba = sd_zbc_get_seq_zones(sdkp, buf, SD_ZBC_BUF_SIZE, + seq_zones_bitmap); + } + + if (lba != sdkp->capacity) { + /* Something went wrong */ + ret = -EIO; + } + +out: + kfree(buf); + if (ret) { + kfree(seq_zones_bitmap); + return ret; + } + + q->seq_zones_bitmap = seq_zones_bitmap; + + return 0; +} + +static void sd_zbc_cleanup(struct scsi_disk *sdkp) +{ + struct request_queue *q = sdkp->disk->queue; + + kfree(q->seq_zones_bitmap); + q->seq_zones_bitmap = NULL; + + kfree(q->seq_zones_wlock); + q->seq_zones_wlock = NULL; + + q->nr_zones = 0; +} + static int sd_zbc_setup(struct scsi_disk *sdkp) { + struct request_queue *q = sdkp->disk->queue; + int ret; /* READ16/WRITE16 is mandatory for ZBC disks */ sdkp->device->use_16_for_rw = 1; @@ -599,15 +714,36 @@ static int sd_zbc_setup(struct scsi_disk *sdkp) sdkp->nr_zones = round_up(sdkp->capacity, sdkp->zone_blocks) >> sdkp->zone_shift; - if (!sdkp->zones_wlock) { - sdkp->zones_wlock = kcalloc(BITS_TO_LONGS(sdkp->nr_zones), - sizeof(unsigned long), - GFP_KERNEL); - if (!sdkp->zones_wlock) - return -ENOMEM; + /* + * Initialize the device request queue information if the number + * of zones changed. + */ + if (sdkp->nr_zones != q->nr_zones) { + + sd_zbc_cleanup(sdkp); + + q->nr_zones = sdkp->nr_zones; + if (sdkp->nr_zones) { + q->seq_zones_wlock = sd_zbc_alloc_zone_bitmap(sdkp); + if (!q->seq_zones_wlock) { + ret = -ENOMEM; + goto err; + } + + ret = sd_zbc_setup_seq_zones_bitmap(sdkp); + if (ret) { + sd_zbc_cleanup(sdkp); + goto err; + } + } + } return 0; + +err: + sd_zbc_cleanup(sdkp); + return ret; } int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf) @@ -661,14 +797,14 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf) err: sdkp->capacity = 0; + sd_zbc_cleanup(sdkp); return ret; } void sd_zbc_remove(struct scsi_disk *sdkp) { - kfree(sdkp->zones_wlock); - sdkp->zones_wlock = NULL; + sd_zbc_cleanup(sdkp); } void sd_zbc_print_zones(struct scsi_disk *sdkp) |