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Date: Tue, 15 Sep 2015 11:21:28 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: houcheng@...il.com, Andy Grover <agrover@...hat.com>,
James Bottomley <jbottomley@...allels.com>,
Christoph Hellwig <hch@....de>,
Douglas Gilbert <dgilbert@...erlog.com>,
Linux SCSI List <linux-scsi@...r.kernel.org>
Subject: [PATCH] scsi: provide UAPI version of scsi/sg.h and scsi/scsi_ioctl.h
Provide a UAPI version of the header in the kernel, making it easier
for interested projects to use an up-to-date version of the header.
The new headers are placed under uapi/linux/scsi/ so as not to conflict
with the glibc-provided headers in /usr/include/scsi.
Cc: Andy Grover <agrover@...hat.com>
Cc: James Bottomley <jbottomley@...allels.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Douglas Gilbert <dgilbert@...erlog.com>
Cc: Linux SCSI List <linux-scsi@...r.kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
Similar to Andy Grover's patch from last January, though developed
independently. Based on the remarks to Andy's patch, I'm leaving
scsi.h aside (Christoph), leaving the internal header in scsi/sg.h
(James) and moving the headers to include/linux/scsi/ (Douglas).
MAINTAINERS | 1 +
include/scsi/scsi_ioctl.h | 17 +-
include/scsi/sg.h | 267 +----------------------------
include/uapi/linux/Kbuild | 1 +
include/uapi/linux/scsi/Kbuild | 2 +
include/{ => uapi/linux}/scsi/scsi_ioctl.h | 36 +---
include/{ => uapi/linux}/scsi/sg.h | 18 +-
7 files changed, 17 insertions(+), 325 deletions(-)
create mode 100644 include/uapi/linux/scsi/Kbuild
copy include/{ => uapi/linux}/scsi/scsi_ioctl.h (41%)
copy include/{ => uapi/linux}/scsi/sg.h (97%)
diff --git a/MAINTAINERS b/MAINTAINERS
index 67a4443daed9..b40764d43dde 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9173,6 +9173,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git
S: Maintained
F: drivers/scsi/
F: include/scsi/
+F: include/uapi/linux/scsi/
SCSI TAPE DRIVER
M: Kai Mäkisara <Kai.Makisara@...umbus.fi>
diff --git a/include/scsi/scsi_ioctl.h b/include/scsi/scsi_ioctl.h
index 8d19d1d233c3..5b07a0a91675 100644
--- a/include/scsi/scsi_ioctl.h
+++ b/include/scsi/scsi_ioctl.h
@@ -1,21 +1,7 @@
#ifndef _SCSI_IOCTL_H
#define _SCSI_IOCTL_H
-#define SCSI_IOCTL_SEND_COMMAND 1
-#define SCSI_IOCTL_TEST_UNIT_READY 2
-#define SCSI_IOCTL_BENCHMARK_COMMAND 3
-#define SCSI_IOCTL_SYNC 4 /* Request synchronous parameters */
-#define SCSI_IOCTL_START_UNIT 5
-#define SCSI_IOCTL_STOP_UNIT 6
-/* The door lock/unlock constants are compatible with Sun constants for
- the cdrom */
-#define SCSI_IOCTL_DOORLOCK 0x5380 /* lock the eject mechanism */
-#define SCSI_IOCTL_DOORUNLOCK 0x5381 /* unlock the mechanism */
-
-#define SCSI_REMOVAL_PREVENT 1
-#define SCSI_REMOVAL_ALLOW 0
-
-#ifdef __KERNEL__
+#include <uapi/linux/scsi/scsi_ioctl.h>
struct scsi_device;
@@ -44,5 +30,4 @@ int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev,
int cmd, bool ndelay);
extern int scsi_ioctl(struct scsi_device *, int, void __user *);
-#endif /* __KERNEL__ */
#endif /* _SCSI_IOCTL_H */
diff --git a/include/scsi/sg.h b/include/scsi/sg.h
index 3afec7032448..87b35e7c4c31 100644
--- a/include/scsi/sg.h
+++ b/include/scsi/sg.h
@@ -1,274 +1,11 @@
#ifndef _SCSI_GENERIC_H
#define _SCSI_GENERIC_H
-#include <linux/compiler.h>
+#include <uapi/linux/scsi/sg.h>
-/*
- * History:
- * Started: Aug 9 by Lawrence Foard (entropy@...ld.std.com), to allow user
- * process control of SCSI devices.
- * Development Sponsored by Killy Corp. NY NY
- *
- * Original driver (sg.h):
- * Copyright (C) 1992 Lawrence Foard
- * Version 2 and 3 extensions to driver:
- * Copyright (C) 1998 - 2014 Douglas Gilbert
- *
- * Version: 3.5.36 (20140603)
- * This version is for 2.6 and 3 series kernels.
- *
- * Documentation
- * =============
- * A web site for the SG device driver can be found at:
- * http://sg.danny.cz/sg [alternatively check the MAINTAINERS file]
- * The documentation for the sg version 3 driver can be found at:
- * http://sg.danny.cz/sg/p/sg_v3_ho.html
- * Also see: <kernel_source>/Documentation/scsi/scsi-generic.txt
- *
- * For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html
- */
-
-#ifdef __KERNEL__
extern int sg_big_buff; /* for sysctl */
-#endif
-
-
-typedef struct sg_iovec /* same structure as used by readv() Linux system */
-{ /* call. It defines one scatter-gather element. */
- void __user *iov_base; /* Starting address */
- size_t iov_len; /* Length in bytes */
-} sg_iovec_t;
-
-
-typedef struct sg_io_hdr
-{
- int interface_id; /* [i] 'S' for SCSI generic (required) */
- int dxfer_direction; /* [i] data transfer direction */
- unsigned char cmd_len; /* [i] SCSI command length */
- unsigned char mx_sb_len; /* [i] max length to write to sbp */
- unsigned short iovec_count; /* [i] 0 implies no scatter gather */
- unsigned int dxfer_len; /* [i] byte count of data transfer */
- void __user *dxferp; /* [i], [*io] points to data transfer memory
- or scatter gather list */
- unsigned char __user *cmdp; /* [i], [*i] points to command to perform */
- void __user *sbp; /* [i], [*o] points to sense_buffer memory */
- unsigned int timeout; /* [i] MAX_UINT->no timeout (unit: millisec) */
- unsigned int flags; /* [i] 0 -> default, see SG_FLAG... */
- int pack_id; /* [i->o] unused internally (normally) */
- void __user * usr_ptr; /* [i->o] unused internally */
- unsigned char status; /* [o] scsi status */
- unsigned char masked_status;/* [o] shifted, masked scsi status */
- unsigned char msg_status; /* [o] messaging level data (optional) */
- unsigned char sb_len_wr; /* [o] byte count actually written to sbp */
- unsigned short host_status; /* [o] errors from host adapter */
- unsigned short driver_status;/* [o] errors from software driver */
- int resid; /* [o] dxfer_len - actual_transferred */
- unsigned int duration; /* [o] time taken by cmd (unit: millisec) */
- unsigned int info; /* [o] auxiliary information */
-} sg_io_hdr_t; /* 64 bytes long (on i386) */
-
-#define SG_INTERFACE_ID_ORIG 'S'
-
-/* Use negative values to flag difference from original sg_header structure */
-#define SG_DXFER_NONE (-1) /* e.g. a SCSI Test Unit Ready command */
-#define SG_DXFER_TO_DEV (-2) /* e.g. a SCSI WRITE command */
-#define SG_DXFER_FROM_DEV (-3) /* e.g. a SCSI READ command */
-#define SG_DXFER_TO_FROM_DEV (-4) /* treated like SG_DXFER_FROM_DEV with the
- additional property than during indirect
- IO the user buffer is copied into the
- kernel buffers before the transfer */
-#define SG_DXFER_UNKNOWN (-5) /* Unknown data direction */
-
-/* following flag values can be "or"-ed together */
-#define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */
-#define SG_FLAG_UNUSED_LUN_INHIBIT 2 /* default is overwrite lun in SCSI */
- /* command block (when <= SCSI_2) */
-#define SG_FLAG_MMAP_IO 4 /* request memory mapped IO */
-#define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */
- /* user space (debug indirect IO) */
-/* defaults:: for sg driver: Q_AT_HEAD; for block layer: Q_AT_TAIL */
-#define SG_FLAG_Q_AT_TAIL 0x10
-#define SG_FLAG_Q_AT_HEAD 0x20
-
-/* following 'info' values are "or"-ed together */
-#define SG_INFO_OK_MASK 0x1
-#define SG_INFO_OK 0x0 /* no sense, host nor driver "noise" */
-#define SG_INFO_CHECK 0x1 /* something abnormal happened */
-
-#define SG_INFO_DIRECT_IO_MASK 0x6
-#define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */
-#define SG_INFO_DIRECT_IO 0x2 /* direct IO requested and performed */
-#define SG_INFO_MIXED_IO 0x4 /* part direct, part indirect IO */
-
-
-typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */
- int host_no; /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */
- int channel;
- int scsi_id; /* scsi id of target device */
- int lun;
- int scsi_type; /* TYPE_... defined in scsi/scsi.h */
- short h_cmd_per_lun;/* host (adapter) maximum commands per lun */
- short d_queue_depth;/* device (or adapter) maximum queue length */
- int unused[2]; /* probably find a good use, set 0 for now */
-} sg_scsi_id_t; /* 32 bytes long on i386 */
-
-typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
- char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */
- char orphan; /* 0 -> normal request, 1 -> from interruped SG_IO */
- char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */
- char problem; /* 0 -> no problem detected, 1 -> error to report */
- int pack_id; /* pack_id associated with request */
- void __user *usr_ptr; /* user provided pointer (in new interface) */
- unsigned int duration; /* millisecs elapsed since written (req_state==1)
- or request duration (req_state==2) */
- int unused;
-} sg_req_info_t; /* 20 bytes long on i386 */
-
-
-/* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow.
- [Those that only apply to the SG 2.x drivers are at the end of the file.]
- (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */
-
-#define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */
-
-/* Used to configure SCSI command transformation layer for ATAPI devices */
-/* Only supported by the ide-scsi driver */
-#define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */
- /* 3rd arg = 0 to disable transform, 1 to enable it */
-#define SG_GET_TRANSFORM 0x2205
-
-#define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */
-#define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */
-
-/* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */
-#define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */
-/* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */
-
-/* Override host setting and always DMA using low memory ( <16MB on i386) */
-#define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */
-#define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */
-
-/* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which
- tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN.
- If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0
- then pack_id ignored by read() and oldest readable fetched. */
-#define SG_SET_FORCE_PACK_ID 0x227b
-#define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */
-
-#define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */
-
-/* Yields max scatter gather tablesize allowed by current host adapter */
-#define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */
-
-#define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */
-/* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */
-#define SG_SCSI_RESET 0x2284
-/* Associated values that can be given to SG_SCSI_RESET follow.
- * SG_SCSI_RESET_NO_ESCALATE may be OR-ed to the _DEVICE, _TARGET, _BUS
- * or _HOST reset value so only that action is attempted. */
-#define SG_SCSI_RESET_NOTHING 0
-#define SG_SCSI_RESET_DEVICE 1
-#define SG_SCSI_RESET_BUS 2
-#define SG_SCSI_RESET_HOST 3
-#define SG_SCSI_RESET_TARGET 4
-#define SG_SCSI_RESET_NO_ESCALATE 0x100
-
-/* synchronous SCSI command ioctl, (only in version 3 interface) */
-#define SG_IO 0x2285 /* similar effect as write() followed by read() */
-
-#define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */
-
-/* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */
-#define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */
-#define SG_GET_KEEP_ORPHAN 0x2288
-
-/* yields scsi midlevel's access_count for this SCSI device */
-#define SG_GET_ACCESS_COUNT 0x2289
-
-
-#define SG_SCATTER_SZ (8 * 4096)
-/* Largest size (in bytes) a single scatter-gather list element can have.
- The value used by the driver is 'max(SG_SCATTER_SZ, PAGE_SIZE)'.
- This value should be a power of 2 (and may be rounded up internally).
- If scatter-gather is not supported by adapter then this value is the
- largest data block that can be read/written by a single scsi command. */
-
-#define SG_DEFAULT_RETRIES 0
-
-/* Defaults, commented if they differ from original sg driver */
-#define SG_DEF_FORCE_LOW_DMA 0 /* was 1 -> memory below 16MB on i386 */
-#define SG_DEF_FORCE_PACK_ID 0
-#define SG_DEF_KEEP_ORPHAN 0
-#define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */
-
-/* maximum outstanding requests, write() yields EDOM if exceeded */
-#define SG_MAX_QUEUE 16
-
-#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */
-
-/* Alternate style type names, "..._t" variants preferred */
-typedef struct sg_io_hdr Sg_io_hdr;
-typedef struct sg_io_vec Sg_io_vec;
-typedef struct sg_scsi_id Sg_scsi_id;
-typedef struct sg_req_info Sg_req_info;
-
-
-/* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */
-/* The older SG interface based on the 'sg_header' structure follows. */
-/* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
-
-#define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */
-
-struct sg_header
-{
- int pack_len; /* [o] reply_len (ie useless), ignored as input */
- int reply_len; /* [i] max length of expected reply (inc. sg_header) */
- int pack_id; /* [io] id number of packet (use ints >= 0) */
- int result; /* [o] 0==ok, else (+ve) Unix errno (best ignored) */
- unsigned int twelve_byte:1;
- /* [i] Force 12 byte command length for group 6 & 7 commands */
- unsigned int target_status:5; /* [o] scsi status from target */
- unsigned int host_status:8; /* [o] host status (see "DID" codes) */
- unsigned int driver_status:8; /* [o] driver status+suggestion */
- unsigned int other_flags:10; /* unused */
- unsigned char sense_buffer[SG_MAX_SENSE]; /* [o] Output in 3 cases:
- when target_status is CHECK_CONDITION or
- when target_status is COMMAND_TERMINATED or
- when (driver_status & DRIVER_SENSE) is true. */
-}; /* This structure is 36 bytes long on i386 */
-
-
-/* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t
- interface is used. They are kept for backward compatibility with
- the original and version 2 drivers. */
-
-#define SG_SET_TIMEOUT 0x2201 /* unit: jiffies (10ms on i386) */
-#define SG_GET_TIMEOUT 0x2202 /* yield timeout as _return_ value */
-
-/* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q.
- Each time a sg_io_hdr_t object is seen on this file descriptor, this
- command queuing flag is set on (overriding the previous setting). */
-#define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on) */
-#define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1 */
-
-/* Turn on/off error sense trace (1 and 0 respectively, default is off).
- Try using: "# cat /proc/scsi/sg/debug" instead in the v3 driver */
-#define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */
-
-#define SG_NEXT_CMD_LEN 0x2283 /* override SCSI command length with given
- number on the next write() on this file descriptor */
-
-
-/* Defaults, commented if they differ from original sg driver */
-#ifdef __KERNEL__
+/* Keep in sync with SG_DEFAULT_TIMEOUT of uapi/linux/sg.h */
#define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */
-#else
-#define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */
-#endif
-
-#define SG_DEF_COMMAND_Q 0 /* command queuing is always on when
- the new interface is used */
-#define SG_DEF_UNDERRUN_FLAG 0
#endif
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 70ff1d9abf0d..47e642753a71 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -11,6 +11,7 @@ header-y += isdn/
header-y += mmc/
header-y += nfsd/
header-y += raid/
+header-y += scsi/
header-y += spi/
header-y += sunrpc/
header-y += tc_act/
diff --git a/include/uapi/linux/scsi/Kbuild b/include/uapi/linux/scsi/Kbuild
new file mode 100644
index 000000000000..56d1848a0962
--- /dev/null
+++ b/include/uapi/linux/scsi/Kbuild
@@ -0,0 +1,2 @@
+header-y += sg.h
+header-y += scsi_ioctl.h
diff --git a/include/scsi/scsi_ioctl.h b/include/uapi/linux/scsi/scsi_ioctl.h
similarity index 41%
copy from include/scsi/scsi_ioctl.h
copy to include/uapi/linux/scsi/scsi_ioctl.h
index 8d19d1d233c3..90ba8d9c5418 100644
--- a/include/scsi/scsi_ioctl.h
+++ b/include/uapi/linux/scsi/scsi_ioctl.h
@@ -1,5 +1,5 @@
-#ifndef _SCSI_IOCTL_H
-#define _SCSI_IOCTL_H
+#ifndef _UAPI_LINUX_SCSI_IOCTL_H
+#define _UAPI_LINUX_SCSI_IOCTL_H
#define SCSI_IOCTL_SEND_COMMAND 1
#define SCSI_IOCTL_TEST_UNIT_READY 2
@@ -15,34 +15,4 @@
#define SCSI_REMOVAL_PREVENT 1
#define SCSI_REMOVAL_ALLOW 0
-#ifdef __KERNEL__
-
-struct scsi_device;
-
-/*
- * Structures used for scsi_ioctl et al.
- */
-
-typedef struct scsi_ioctl_command {
- unsigned int inlen;
- unsigned int outlen;
- unsigned char data[0];
-} Scsi_Ioctl_Command;
-
-typedef struct scsi_idlun {
- __u32 dev_id;
- __u32 host_unique_id;
-} Scsi_Idlun;
-
-/* Fibre Channel WWN, port_id struct */
-typedef struct scsi_fctargaddress {
- __u32 host_port_id;
- unsigned char host_wwn[8]; // include NULL term.
-} Scsi_FCTargAddress;
-
-int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev,
- int cmd, bool ndelay);
-extern int scsi_ioctl(struct scsi_device *, int, void __user *);
-
-#endif /* __KERNEL__ */
-#endif /* _SCSI_IOCTL_H */
+#endif /* _UAPI_LINUX_SCSI_IOCTL_H */
diff --git a/include/scsi/sg.h b/include/uapi/linux/scsi/sg.h
similarity index 97%
copy from include/scsi/sg.h
copy to include/uapi/linux/scsi/sg.h
index 3afec7032448..4433d20d2d18 100644
--- a/include/scsi/sg.h
+++ b/include/uapi/linux/scsi/sg.h
@@ -1,5 +1,5 @@
-#ifndef _SCSI_GENERIC_H
-#define _SCSI_GENERIC_H
+#ifndef _UAPI_LINUX_SG_H
+#define _UAPI_LINUX_SG_H
#include <linux/compiler.h>
@@ -28,10 +28,6 @@
* For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html
*/
-#ifdef __KERNEL__
-extern int sg_big_buff; /* for sysctl */
-#endif
-
typedef struct sg_iovec /* same structure as used by readv() Linux system */
{ /* call. It defines one scatter-gather element. */
@@ -184,7 +180,7 @@ typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
#define SG_GET_KEEP_ORPHAN 0x2288
/* yields scsi midlevel's access_count for this SCSI device */
-#define SG_GET_ACCESS_COUNT 0x2289
+#define SG_GET_ACCESS_COUNT 0x2289
#define SG_SCATTER_SZ (8 * 4096)
@@ -261,9 +257,9 @@ struct sg_header
/* Defaults, commented if they differ from original sg driver */
-#ifdef __KERNEL__
-#define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */
-#else
+
+/* Keep in sync with SG_DEFAULT_TIMEOUT of scsi/sg.h */
+#ifndef __KERNEL__
#define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */
#endif
@@ -271,4 +267,4 @@ struct sg_header
the new interface is used */
#define SG_DEF_UNDERRUN_FLAG 0
-#endif
+#endif /* _UAPI_LINUX_SG_H */
--
2.5.0
--
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