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blk-zoned: implement ioctls
Adds the new BLKREPORTZONE and BLKRESETZONE ioctls for respectively obtaining the zone configuration of a zoned block device and resetting the write pointer of sequential zones of a zoned block device. The BLKREPORTZONE ioctl maps directly to a single call of the function blkdev_report_zones. The zone information result is passed as an array of struct blk_zone identical to the structure used internally for processing the REQ_OP_ZONE_REPORT operation. The BLKRESETZONE ioctl maps to a single call of the blkdev_reset_zones function. Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com> Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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6a0cb1bc10
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@ -255,3 +255,96 @@ int blkdev_reset_zones(struct block_device *bdev,
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return 0;
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}
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EXPORT_SYMBOL_GPL(blkdev_reset_zones);
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/**
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* BLKREPORTZONE ioctl processing.
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* Called from blkdev_ioctl.
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*/
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int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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struct request_queue *q;
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struct blk_zone_report rep;
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struct blk_zone *zones;
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int ret;
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if (!argp)
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return -EINVAL;
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q = bdev_get_queue(bdev);
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if (!q)
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return -ENXIO;
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if (!blk_queue_is_zoned(q))
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return -ENOTTY;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
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return -EFAULT;
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if (!rep.nr_zones)
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return -EINVAL;
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zones = kcalloc(rep.nr_zones, sizeof(struct blk_zone), GFP_KERNEL);
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if (!zones)
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return -ENOMEM;
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ret = blkdev_report_zones(bdev, rep.sector,
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zones, &rep.nr_zones,
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GFP_KERNEL);
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if (ret)
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goto out;
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if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) {
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ret = -EFAULT;
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goto out;
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}
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if (rep.nr_zones) {
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if (copy_to_user(argp + sizeof(struct blk_zone_report), zones,
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sizeof(struct blk_zone) * rep.nr_zones))
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ret = -EFAULT;
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}
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out:
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kfree(zones);
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return ret;
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}
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/**
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* BLKRESETZONE ioctl processing.
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* Called from blkdev_ioctl.
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*/
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int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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struct request_queue *q;
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struct blk_zone_range zrange;
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if (!argp)
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return -EINVAL;
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q = bdev_get_queue(bdev);
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if (!q)
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return -ENXIO;
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if (!blk_queue_is_zoned(q))
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return -ENOTTY;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (!(mode & FMODE_WRITE))
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return -EBADF;
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if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
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return -EFAULT;
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return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
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GFP_KERNEL);
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}
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@ -519,6 +519,10 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
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BLKDEV_DISCARD_SECURE);
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case BLKZEROOUT:
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return blk_ioctl_zeroout(bdev, mode, arg);
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case BLKREPORTZONE:
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return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
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case BLKRESETZONE:
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return blkdev_reset_zones_ioctl(bdev, mode, cmd, arg);
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case HDIO_GETGEO:
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return blkdev_getgeo(bdev, argp);
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case BLKRAGET:
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@ -316,6 +316,27 @@ extern int blkdev_report_zones(struct block_device *bdev,
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extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
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sector_t nr_sectors, gfp_t gfp_mask);
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extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg);
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extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg);
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#else /* CONFIG_BLK_DEV_ZONED */
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static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
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fmode_t mode, unsigned int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
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fmode_t mode, unsigned int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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#endif /* CONFIG_BLK_DEV_ZONED */
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struct request_queue {
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@ -16,6 +16,7 @@
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#define _UAPI_BLKZONED_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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/**
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* enum blk_zone_type - Types of zones allowed in a zoned device.
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@ -100,4 +101,43 @@ struct blk_zone {
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__u8 reserved[36];
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};
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/**
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* struct blk_zone_report - BLKREPORTZONE ioctl request/reply
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*
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* @sector: starting sector of report
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* @nr_zones: IN maximum / OUT actual
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* @reserved: padding to 16 byte alignment
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* @zones: Space to hold @nr_zones @zones entries on reply.
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*
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* The array of at most @nr_zones must follow this structure in memory.
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*/
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struct blk_zone_report {
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__u64 sector;
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__u32 nr_zones;
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__u8 reserved[4];
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struct blk_zone zones[0];
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} __packed;
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/**
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* struct blk_zone_range - BLKRESETZONE ioctl request
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* @sector: starting sector of the first zone to issue reset write pointer
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* @nr_sectors: Total number of sectors of 1 or more zones to reset
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*/
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struct blk_zone_range {
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__u64 sector;
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__u64 nr_sectors;
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};
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/**
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* Zoned block device ioctl's:
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*
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* @BLKREPORTZONE: Get zone information. Takes a zone report as argument.
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* The zone report will start from the zone containing the
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* sector specified in the report request structure.
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* @BLKRESETZONE: Reset the write pointer of the zones in the specified
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* sector range. The sector range must be zone aligned.
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*/
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#define BLKREPORTZONE _IOWR(0x12, 130, struct blk_zone_report)
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#define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range)
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#endif /* _UAPI_BLKZONED_H */
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@ -225,6 +225,10 @@ struct fsxattr {
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#define BLKSECDISCARD _IO(0x12,125)
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#define BLKROTATIONAL _IO(0x12,126)
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#define BLKZEROOUT _IO(0x12,127)
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/*
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* A jump here: 130-131 are reserved for zoned block devices
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* (see uapi/linux/blkzoned.h)
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*/
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#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
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#define FIBMAP _IO(0x00,1) /* bmap access */
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