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Move code that is used both by initiator and target drivers

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Move the functions that are used by both the initiator and target
subsystems into scsi_common.c/.h. This change will allow to remove
the initiator SCSI header include directives from most SCSI target
source files in a later patch.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Bart Van Assche
2015-05-08 10:07:48 +02:00
committed by James Bottomley
parent c5f1ac8b94
commit 07e3842055
9 changed files with 244 additions and 223 deletions
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62
drivers/scsi/scsi_scan.c
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@@ -1269,68 +1269,6 @@ static void scsi_sequential_lun_scan(struct scsi_target *starget,
return;
}
/**
* scsilun_to_int - convert a scsi_lun to an int
* @scsilun: struct scsi_lun to be converted.
*
* Description:
* Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
* integer, and return the result. The caller must check for
* truncation before using this function.
*
* Notes:
* For a description of the LUN format, post SCSI-3 see the SCSI
* Architecture Model, for SCSI-3 see the SCSI Controller Commands.
*
* Given a struct scsi_lun of: d2 04 0b 03 00 00 00 00, this function
* returns the integer: 0x0b03d204
*
* This encoding will return a standard integer LUN for LUNs smaller
* than 256, which typically use a single level LUN structure with
* addressing method 0.
**/
u64 scsilun_to_int(struct scsi_lun *scsilun)
{
int i;
u64 lun;
lun = 0;
for (i = 0; i < sizeof(lun); i += 2)
lun = lun | (((u64)scsilun->scsi_lun[i] << ((i + 1) * 8)) |
((u64)scsilun->scsi_lun[i + 1] << (i * 8)));
return lun;
}
EXPORT_SYMBOL(scsilun_to_int);
/**
* int_to_scsilun - reverts an int into a scsi_lun
* @lun: integer to be reverted
* @scsilun: struct scsi_lun to be set.
*
* Description:
* Reverts the functionality of the scsilun_to_int, which packed
* an 8-byte lun value into an int. This routine unpacks the int
* back into the lun value.
*
* Notes:
* Given an integer : 0x0b03d204, this function returns a
* struct scsi_lun of: d2 04 0b 03 00 00 00 00
*
**/
void int_to_scsilun(u64 lun, struct scsi_lun *scsilun)
{
int i;
memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
for (i = 0; i < sizeof(lun); i += 2) {
scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
scsilun->scsi_lun[i+1] = lun & 0xFF;
lun = lun >> 16;
}
}
EXPORT_SYMBOL(int_to_scsilun);
/**
* scsi_report_lun_scan - Scan using SCSI REPORT LUN results
* @starget: which target