Merge branch 'linus' into timers/hpet

1 files changed, 116 insertions, 0 deletions

diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
new file mode 100644
index 000000000000..95b9f06534d5
--- /dev/null
+++ b/drivers/scsi/sd.h
@@ -0,0 +1,116 @@
+#ifndef _SCSI_DISK_H
+#define _SCSI_DISK_H
+
+/*
+ * More than enough for everybody ;)  The huge number of majors
+ * is a leftover from 16bit dev_t days, we don't really need that
+ * much numberspace.
+ */
+#define SD_MAJORS	16
+
+/*
+ * This is limited by the naming scheme enforced in sd_probe,
+ * add another character to it if you really need more disks.
+ */
+#define SD_MAX_DISKS	(((26 * 26) + 26 + 1) * 26)
+
+/*
+ * Time out in seconds for disks and Magneto-opticals (which are slower).
+ */
+#define SD_TIMEOUT		(30 * HZ)
+#define SD_MOD_TIMEOUT		(75 * HZ)
+
+/*
+ * Number of allowed retries
+ */
+#define SD_MAX_RETRIES		5
+#define SD_PASSTHROUGH_RETRIES	1
+
+/*
+ * Size of the initial data buffer for mode and read capacity data
+ */
+#define SD_BUF_SIZE		512
+
+/*
+ * Number of sectors at the end of the device to avoid multi-sector
+ * accesses to in the case of last_sector_bug
+ */
+#define SD_LAST_BUGGY_SECTORS	8
+
+struct scsi_disk {
+	struct scsi_driver *driver;	/* always &sd_template */
+	struct scsi_device *device;
+	struct device	dev;
+	struct gendisk	*disk;
+	unsigned int	openers;	/* protected by BKL for now, yuck */
+	sector_t	capacity;	/* size in 512-byte sectors */
+	u32		index;
+	u8		media_present;
+	u8		write_prot;
+	u8		protection_type;/* Data Integrity Field */
+	unsigned	previous_state : 1;
+	unsigned	ATO : 1;	/* state of disk ATO bit */
+	unsigned	WCE : 1;	/* state of disk WCE bit */
+	unsigned	RCD : 1;	/* state of disk RCD bit, unused */
+	unsigned	DPOFUA : 1;	/* state of disk DPOFUA bit */
+};
+#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
+
+static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
+{
+	return container_of(disk->private_data, struct scsi_disk, driver);
+}
+
+#define sd_printk(prefix, sdsk, fmt, a...)				\
+        (sdsk)->disk ?							\
+	sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,		\
+		    (sdsk)->disk->disk_name, ##a) :			\
+	sdev_printk(prefix, (sdsk)->device, fmt, ##a)
+
+/*
+ * A DIF-capable target device can be formatted with different
+ * protection schemes.  Currently 0 through 3 are defined:
+ *
+ * Type 0 is regular (unprotected) I/O
+ *
+ * Type 1 defines the contents of the guard and reference tags
+ *
+ * Type 2 defines the contents of the guard and reference tags and
+ * uses 32-byte commands to seed the latter
+ *
+ * Type 3 defines the contents of the guard tag only
+ */
+
+enum sd_dif_target_protection_types {
+	SD_DIF_TYPE0_PROTECTION = 0x0,
+	SD_DIF_TYPE1_PROTECTION = 0x1,
+	SD_DIF_TYPE2_PROTECTION = 0x2,
+	SD_DIF_TYPE3_PROTECTION = 0x3,
+};
+
+/*
+ * Data Integrity Field tuple.
+ */
+struct sd_dif_tuple {
+       __be16 guard_tag;	/* Checksum */
+       __be16 app_tag;		/* Opaque storage */
+       __be32 ref_tag;		/* Target LBA or indirect LBA */
+};
+
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+
+extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int);
+extern void sd_dif_config_host(struct scsi_disk *);
+extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
+extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
+
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+
+#define sd_dif_op(a, b, c)			do { } while (0)
+#define sd_dif_config_host(a)			do { } while (0)
+#define sd_dif_prepare(a, b, c)			(0)
+#define sd_dif_complete(a, b)			(0)
+
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
+#endif /* _SCSI_DISK_H */