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03a5743a12
Our current implementation has a generic set of barrier functions that go through the SCSI driver model. Realistically, this is unnecessary, because the only device that can use barriers (sd) can set the flush functions up at probe or revalidate time. This patch pulls the barrier functions out of the mid layer and scsi driver model and relocates them directly in sd. Acked-by: Tejun Heo <htejun@gmail.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
#ifndef _SCSI_DISK_H
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#define _SCSI_DISK_H
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/*
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* More than enough for everybody ;) The huge number of majors
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* is a leftover from 16bit dev_t days, we don't really need that
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* much numberspace.
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*/
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#define SD_MAJORS 16
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/*
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* This is limited by the naming scheme enforced in sd_probe,
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* add another character to it if you really need more disks.
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*/
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#define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26)
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/*
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* Time out in seconds for disks and Magneto-opticals (which are slower).
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*/
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#define SD_TIMEOUT (30 * HZ)
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#define SD_MOD_TIMEOUT (75 * HZ)
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/*
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* Number of allowed retries
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*/
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#define SD_MAX_RETRIES 5
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#define SD_PASSTHROUGH_RETRIES 1
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/*
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* Size of the initial data buffer for mode and read capacity data
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*/
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#define SD_BUF_SIZE 512
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struct scsi_disk {
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struct scsi_driver *driver; /* always &sd_template */
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struct scsi_device *device;
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struct class_device cdev;
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struct gendisk *disk;
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unsigned int openers; /* protected by BKL for now, yuck */
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sector_t capacity; /* size in 512-byte sectors */
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u32 index;
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u8 media_present;
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u8 write_prot;
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unsigned WCE : 1; /* state of disk WCE bit */
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unsigned RCD : 1; /* state of disk RCD bit, unused */
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unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
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};
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#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev)
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static int sd_revalidate_disk(struct gendisk *disk);
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static void sd_rw_intr(struct scsi_cmnd * SCpnt);
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static int sd_probe(struct device *);
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static int sd_remove(struct device *);
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static void sd_shutdown(struct device *dev);
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static int sd_suspend(struct device *dev, pm_message_t state);
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static int sd_resume(struct device *dev);
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static void sd_rescan(struct device *);
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static int sd_init_command(struct scsi_cmnd *);
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static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
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static void scsi_disk_release(struct class_device *cdev);
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static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
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static void sd_print_result(struct scsi_disk *, int);
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#define sd_printk(prefix, sdsk, fmt, a...) \
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(sdsk)->disk ? \
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sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
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(sdsk)->disk->disk_name, ##a) : \
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sdev_printk(prefix, (sdsk)->device, fmt, ##a)
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#endif /* _SCSI_DISK_H */
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