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Subject[PATCH v6 2/2] Add ioctl to issue ZBC/ZAC commands via block layer
Date
Add support for ZBC ioctl's
BLKREPORT - Issue Report Zones to device.
BLKOPENZONE - Issue Zone Action: Open Zone command.
BLKCLOSEZONE - Issue Zone Action: Close Zone command.
BLKRESETZONE - Issue Zone Action: Reset Zone command.

Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
---
v6:
- Added GFP_DMA to gfp mask.
v4:
- Rebase on linux-next tag next-20160617.
- Change bio flags to bio op's
---
block/ioctl.c | 110 ++++++++++++++++++++++++++++++++++++++
include/uapi/linux/blkzoned_api.h | 6 +++
include/uapi/linux/fs.h | 1 +
3 files changed, 117 insertions(+)

diff --git a/block/ioctl.c b/block/ioctl.c
index ed2397f..a2a6c2c 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -7,6 +7,7 @@
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/blktrace_api.h>
+#include <linux/blkzoned_api.h>
#include <linux/pr.h>
#include <asm/uaccess.h>

@@ -194,6 +195,109 @@ int blkdev_reread_part(struct block_device *bdev)
}
EXPORT_SYMBOL(blkdev_reread_part);

+static int blk_zoned_report_ioctl(struct block_device *bdev, fmode_t mode,
+ void __user *parg)
+{
+ int error = -EFAULT;
+ gfp_t gfp = GFP_KERNEL | GFP_DMA;
+ struct bdev_zone_report_io *zone_iodata = NULL;
+ int order = 0;
+ struct page *pgs = NULL;
+ u32 alloc_size = PAGE_SIZE;
+ unsigned long op_flags = 0;
+ u8 opt = 0;
+
+ if (!(mode & FMODE_READ))
+ return -EBADF;
+
+ zone_iodata = (void *)get_zeroed_page(gfp);
+ if (!zone_iodata) {
+ error = -ENOMEM;
+ goto report_zones_out;
+ }
+ if (copy_from_user(zone_iodata, parg, sizeof(*zone_iodata))) {
+ error = -EFAULT;
+ goto report_zones_out;
+ }
+ if (zone_iodata->data.in.return_page_count > alloc_size) {
+ int npages;
+
+ alloc_size = zone_iodata->data.in.return_page_count;
+ npages = (alloc_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ pgs = alloc_pages(gfp, ilog2(npages));
+ if (pgs) {
+ void *mem = page_address(pgs);
+
+ if (!mem) {
+ error = -ENOMEM;
+ goto report_zones_out;
+ }
+ order = ilog2(npages);
+ memset(mem, 0, alloc_size);
+ memcpy(mem, zone_iodata, sizeof(*zone_iodata));
+ free_page((unsigned long)zone_iodata);
+ zone_iodata = mem;
+ } else {
+ /* Result requires DMA capable memory */
+ pr_err("Not enough memory available for request.\n");
+ error = -ENOMEM;
+ goto report_zones_out;
+ }
+ }
+ opt = zone_iodata->data.in.report_option;
+ error = blkdev_issue_zone_report(bdev, op_flags,
+ zone_iodata->data.in.zone_locator_lba, opt,
+ pgs ? pgs : virt_to_page(zone_iodata),
+ alloc_size, GFP_KERNEL);
+
+ if (error)
+ goto report_zones_out;
+
+ if (copy_to_user(parg, zone_iodata, alloc_size))
+ error = -EFAULT;
+
+report_zones_out:
+ if (pgs)
+ __free_pages(pgs, order);
+ else if (zone_iodata)
+ free_page((unsigned long)zone_iodata);
+ return error;
+}
+
+static int blk_zoned_action_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ unsigned int op = 0;
+
+ if (!(mode & FMODE_WRITE))
+ return -EBADF;
+
+ /*
+ * When acting on zones we explicitly disallow using a partition.
+ */
+ if (bdev != bdev->bd_contains) {
+ pr_err("%s: All zone operations disallowed on this device\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ switch (cmd) {
+ case BLKOPENZONE:
+ op = REQ_OP_ZONE_OPEN;
+ break;
+ case BLKCLOSEZONE:
+ op = REQ_OP_ZONE_CLOSE;
+ break;
+ case BLKRESETZONE:
+ op = REQ_OP_ZONE_RESET;
+ break;
+ default:
+ pr_err("%s: Unknown action: %u\n", __func__, cmd);
+ return -EINVAL;
+ }
+ return blkdev_issue_zone_action(bdev, op, 0, arg, GFP_KERNEL);
+}
+
static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
unsigned long arg, unsigned long flags)
{
@@ -568,6 +672,12 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
case BLKTRACESETUP:
case BLKTRACETEARDOWN:
return blk_trace_ioctl(bdev, cmd, argp);
+ case BLKREPORT:
+ return blk_zoned_report_ioctl(bdev, mode, argp);
+ case BLKOPENZONE:
+ case BLKCLOSEZONE:
+ case BLKRESETZONE:
+ return blk_zoned_action_ioctl(bdev, mode, cmd, arg);
case IOC_PR_REGISTER:
return blkdev_pr_register(bdev, argp);
case IOC_PR_RESERVE:
diff --git a/include/uapi/linux/blkzoned_api.h b/include/uapi/linux/blkzoned_api.h
index 48c17ad..3566de0 100644
--- a/include/uapi/linux/blkzoned_api.h
+++ b/include/uapi/linux/blkzoned_api.h
@@ -211,4 +211,10 @@ struct bdev_zone_report_io {
} data;
} __packed;

+/* continuing from uapi/linux/fs.h: */
+#define BLKREPORT _IOWR(0x12, 130, struct bdev_zone_report_io)
+#define BLKOPENZONE _IO(0x12, 131)
+#define BLKCLOSEZONE _IO(0x12, 132)
+#define BLKRESETZONE _IO(0x12, 133)
+
#endif /* _UAPI_BLKZONED_API_H */
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 3b00f7c..c0b565b 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -222,6 +222,7 @@ struct fsxattr {
#define BLKSECDISCARD _IO(0x12,125)
#define BLKROTATIONAL _IO(0x12,126)
#define BLKZEROOUT _IO(0x12,127)
+/* A jump here: See blkzoned_api.h, Reserving 130 to 133. */

#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
#define FIBMAP _IO(0x00,1) /* bmap access */
--
2.8.1
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