kernel.git/drivers/scsi/scsi_debug.c, branch linux-2.6.33.y

scsi_debug: virtual_gb ignores sector_size

2010-05-12T22:03:12Z

commit 5447ed6c968e7270b656afa273c2b79d15d82edd upstream. In the scsi_debug driver, the virtual_gb option ignores the sector_size, implicitly assuming that is 512 bytes. So if 'virtual_gb=1 sector_size=4096' the result is an 8 GB (virtual) disk. Signed-off-by: Douglas Gilbert Signed-off-by: James Bottomley Signed-off-by: Greg Kroah-Hartman

[SCSI] scsi_debug: fix Thin provisioning support

2009-12-04T18:00:49Z

While testing scsi_debug with these patches I found a problem with the Block Limits VPD page function. The length returned by the inquiry_evpd_b0() function was too short. A patch to fix that and a cosmetic change (that the form factor of scsi_debug is less than 1.8 inches) is attached. Signed-off-by: Douglas Gilbert Signed-off-by: James Bottomley

[SCSI] scsi_debug: Thin provisioning support

2009-12-04T18:00:16Z

This version fixes 64-bit modulo on 32-bit as well as inadvertent map updates when TP was disabled. Implement support for thin provisioning in scsi_debug. No actual memory de-allocation is taking place. The intent is to emulate a thinly provisioned storage device, not to be one. There are four new module options: - unmap_granularity specifies the granularity at which to track mapped blocks (specified in number of logical blocks). 2048 (1 MB) is a realistic value for disk arrays although some may have a finer granularity. - unmap_alignment specifies the first LBA which is naturally aligned on an unmap_granularity boundary. - unmap_max_desc specifies the maximum number of ranges that can be unmapped using one UNMAP command. If this is 0, only WRITE SAME is supported and UNMAP will cause a check condition. - unmap_max_blocks specifies the maximum number of blocks that can be unmapped using a single UNMAP command. Default is 0xffffffff. These parameters are reported in the new and extended block limits VPD. If unmap_granularity is specified the device is tagged as thin provisioning capable in READ CAPACITY(16). A bitmap is allocated to track whether blocks are mapped or not. A WRITE request will cause a block to be mapped. So will WRITE SAME unless the UNMAP bit is set. Blocks can be unmapped using either WRITE SAME or UNMAP. No accounting is done to track partial blocks. This means that only whole blocks will be marked free. This is how the array people tell me their firmwares work. GET LBA STATUS is also supported. This command reports whether a block is mapped or not, and how long the adjoining mapped/unmapped extent is. The block allocation bitmap can also be viewed from user space via: /sys/bus/pseudo/drivers/scsi_debug/map Signed-off-by: Martin K. Petersen Acked-by: Douglas Gilbert Signed-off-by: James Bottomley

[SCSI] scsi_debug: Implement support for DIF Type 2

2009-10-02T14:47:17Z

Add support for 32-byte READ/WRITE as well as DIF Type 2 protection. Reject protected 10/12/16 byte READ/WRITE commands when Type 2 is enabled. Verify Type 2 reference tag according to Expected Initial LBA in 32-byte CDB. Signed-off-by: Martin K. Petersen Acked-by: Douglas Gilbert Signed-off-by: James Bottomley

scsi_debug: Add support for physical block exponent and alignment

2009-06-21T16:03:54Z

This patch adds support for setting the physical block exponent and lowest aligned LBA in the READ CAPACITY(16) response. The B0 VPD page is adjusted accordingly. Signed-off-by: Martin K. Petersen Acked-by: Douglas Gilbert Signed-off-by: James Bottomley

[SCSI] scsi_debug: fix virtual disk larger than 1TB

2009-05-20T22:21:15Z

Signed-off-by: FUJITA Tomonori Acked-by: Douglas Gilbert Signed-off-by: James Bottomley

[SCSI] scsi_debug: DIF/DIX support

2009-03-12T17:57:55Z

This patch adds support for DIX and DIF in scsi_debug. A separate buffer is allocated for the protection information. - The dix parameter indicates whether the controller supports DIX (protection information DMA) - The dif parameter indicates whether the simulated storage device supports DIF - The guard parameter switches between T10 CRC(0) and IP checksum(1) - The ato parameter indicates whether the application tag is owned by the disk(0) or the OS(1) - DIF and DIX errors can be triggered using the scsi_debug_opts mask Signed-off-by: Martin K. Petersen Acked-by: Douglas Gilbert Signed-off-by: James Bottomley

[SCSI] struct device - replace bus_id with dev_name(), dev_set_name()

2009-01-02T16:22:16Z

[jejb: limit ioctl to returning 20 characters to avoid overrun on long device names and add a few more conversions] Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman Signed-off-by: James Bottomley

[SCSI] replace FUNCTION with func

2008-07-27T14:31:49Z

[jejb: fixed up a ton of missed conversions. All of you are on notice this has happened, driver trees will now need to be rebased] Signed-off-by: Harvey Harrison Cc: SCSI List Signed-off-by: Andrew Morton Signed-off-by: James Bottomley

[SCSI] scsi_debug: add support for rotation speed

2008-07-12T13:22:30Z

Add support for VPD page b1 to scsi_debug SCSI VPD page b1 reports the nominal rotation speed of the device. Since scsi_debug is ram-based, claim to be a non-rotating medium. Signed-off-by: Matthew Wilcox Acked-by: Douglas Gilbert Signed-off-by: James Bottomley