Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e245befc authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'bsg' of git://git.kernel.dk/data/git/linux-2.6-block 

* 'bsg' of git://git.kernel.dk/data/git/linux-2.6-block: (25 commits)
  bsg: Kconfig updates
  bsg: add SCSI transport-level request support
  bsg: add bidi support
  add a struct request pointer to the request structure
  bsg: fix the deadlock on discarding done commands
  bsg: fix a blocking read bug
  bsg: minor bug fixes
  improve bsg device allocation
  bind bsg to all SCSI devices
  bsg: bind bsg to request_queue instead of gendisk
  bsg: add a request_queue argument to scsi_cmd_ioctl()
  bsg: simplify __bsg_alloc_command failpath
  bsg: add cheasy error checks for sysfs stuff
  Add queue resizing support
  Replace s32, u32 and u64 with __s32, __u32 and __u64 in bsg.h for userspace
  bsg: silence a bogus gcc warning
  bsg: style cleanup
  bsg: use u32 etc instead of uint32_t
  bsg: add SG_IO to SG v4
  bsg: replace SG v3 with SG v4
  ...
parents 14dc5249 58ff411e

block/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -51,4 +51,12 @@ config LSF 


endif # BLOCK



config BLK_DEV_BSG

	bool "Block layer SG support"

	depends on SCSI && EXPERIMENTAL

	default y

	---help---

	Saying Y here will enable generic SG (SCSI generic) v4

	support for any block device.



source block/Kconfig.iosched

block/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 


obj-$(CONFIG_BLOCK) := elevator.o ll_rw_blk.o ioctl.o genhd.o scsi_ioctl.o



obj-$(CONFIG_BLK_DEV_BSG)	+= bsg.o

obj-$(CONFIG_IOSCHED_NOOP)	+= noop-iosched.o

obj-$(CONFIG_IOSCHED_AS)	+= as-iosched.o

obj-$(CONFIG_IOSCHED_DEADLINE)	+= deadline-iosched.o

block/bsg.c

0 → 100644
+1114 −0

File added.

Preview size limit exceeded, changes collapsed.

block/ll_rw_blk.c

+1 −0
Original line number Diff line number Diff line
@@ -256,6 +256,7 @@ static void rq_init(request_queue_t *q, struct request *rq) 
	rq->end_io = NULL;

	rq->end_io_data = NULL;

	rq->completion_data = NULL;

	rq->next_rq = NULL;

}



/**

block/scsi_ioctl.c

+95 −68
Original line number Diff line number Diff line
@@ -41,8 +41,6 @@ const unsigned char scsi_command_size[8] = 


EXPORT_SYMBOL(scsi_command_size);



#define BLK_DEFAULT_TIMEOUT	(60 * HZ)



#include <scsi/sg.h>



static int sg_get_version(int __user *p)
@@ -114,7 +112,7 @@ static int sg_emulated_host(request_queue_t *q, int __user *p) 
#define safe_for_read(cmd)	[cmd] = CMD_READ_SAFE

#define safe_for_write(cmd)	[cmd] = CMD_WRITE_SAFE



static int verify_command(struct file *file, unsigned char *cmd)

int blk_verify_command(unsigned char *cmd, int has_write_perm)

{

	static unsigned char cmd_type[256] = {
@@ -193,18 +191,11 @@ static int verify_command(struct file *file, unsigned char *cmd) 
		safe_for_write(GPCMD_SET_STREAMING),

	};

	unsigned char type = cmd_type[cmd[0]];

	int has_write_perm = 0;



	/* Anybody who can open the device can do a read-safe command */

	if (type & CMD_READ_SAFE)

		return 0;



	/*

	 * file can be NULL from ioctl_by_bdev()...

	 */

	if (file)

		has_write_perm = file->f_mode & FMODE_WRITE;



	/* Write-safe commands just require a writable open.. */

	if ((type & CMD_WRITE_SAFE) && has_write_perm)

		return 0;
@@ -221,25 +212,96 @@ static int verify_command(struct file *file, unsigned char *cmd) 
	/* Otherwise fail it with an "Operation not permitted" */

	return -EPERM;

}

EXPORT_SYMBOL_GPL(blk_verify_command);



int blk_fill_sghdr_rq(request_queue_t *q, struct request *rq,

		      struct sg_io_hdr *hdr, int has_write_perm)

{

	memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */



	if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))

		return -EFAULT;

	if (blk_verify_command(rq->cmd, has_write_perm))

		return -EPERM;



	/*

	 * fill in request structure

	 */

	rq->cmd_len = hdr->cmd_len;

	rq->cmd_type = REQ_TYPE_BLOCK_PC;



	rq->timeout = (hdr->timeout * HZ) / 1000;

	if (!rq->timeout)

		rq->timeout = q->sg_timeout;

	if (!rq->timeout)

		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;



	return 0;

}

EXPORT_SYMBOL_GPL(blk_fill_sghdr_rq);



/*

 * unmap a request that was previously mapped to this sg_io_hdr. handles

 * both sg and non-sg sg_io_hdr.

 */

int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)

{

	blk_rq_unmap_user(rq->bio);

	blk_put_request(rq);

	return 0;

}

EXPORT_SYMBOL_GPL(blk_unmap_sghdr_rq);



int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,

			  struct bio *bio)

{

	int r, ret = 0;



	/*

	 * fill in all the output members

	 */

	hdr->status = rq->errors & 0xff;

	hdr->masked_status = status_byte(rq->errors);

	hdr->msg_status = msg_byte(rq->errors);

	hdr->host_status = host_byte(rq->errors);

	hdr->driver_status = driver_byte(rq->errors);

	hdr->info = 0;

	if (hdr->masked_status || hdr->host_status || hdr->driver_status)

		hdr->info |= SG_INFO_CHECK;

	hdr->resid = rq->data_len;

	hdr->sb_len_wr = 0;



	if (rq->sense_len && hdr->sbp) {

		int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);



		if (!copy_to_user(hdr->sbp, rq->sense, len))

			hdr->sb_len_wr = len;

		else

			ret = -EFAULT;

	}



	rq->bio = bio;

	r = blk_unmap_sghdr_rq(rq, hdr);

	if (ret)

		r = ret;



	return r;

}

EXPORT_SYMBOL_GPL(blk_complete_sghdr_rq);



static int sg_io(struct file *file, request_queue_t *q,

		struct gendisk *bd_disk, struct sg_io_hdr *hdr)

{

	unsigned long start_time, timeout;

	int writing = 0, ret = 0;

	unsigned long start_time;

	int writing = 0, ret = 0, has_write_perm = 0;

	struct request *rq;

	char sense[SCSI_SENSE_BUFFERSIZE];

	unsigned char cmd[BLK_MAX_CDB];

	struct bio *bio;



	if (hdr->interface_id != 'S')

		return -EINVAL;

	if (hdr->cmd_len > BLK_MAX_CDB)

		return -EINVAL;

	if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))

		return -EFAULT;

	if (verify_command(file, cmd))

		return -EPERM;



	if (hdr->dxfer_len > (q->max_hw_sectors << 9))

		return -EIO;
@@ -260,25 +322,13 @@ static int sg_io(struct file *file, request_queue_t *q, 
	if (!rq)

		return -ENOMEM;



	/*

	 * fill in request structure

	 */

	rq->cmd_len = hdr->cmd_len;

	memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */

	memcpy(rq->cmd, cmd, hdr->cmd_len);



	memset(sense, 0, sizeof(sense));

	rq->sense = sense;

	rq->sense_len = 0;



	rq->cmd_type = REQ_TYPE_BLOCK_PC;

	if (file)

		has_write_perm = file->f_mode & FMODE_WRITE;



	timeout = msecs_to_jiffies(hdr->timeout);

	rq->timeout = (timeout < INT_MAX) ? timeout : INT_MAX;

	if (!rq->timeout)

		rq->timeout = q->sg_timeout;

	if (!rq->timeout)

		rq->timeout = BLK_DEFAULT_TIMEOUT;

	if (blk_fill_sghdr_rq(q, rq, hdr, has_write_perm)) {

		blk_put_request(rq);

		return -EFAULT;

	}



	if (hdr->iovec_count) {

		const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
@@ -306,6 +356,9 @@ static int sg_io(struct file *file, request_queue_t *q, 
		goto out;



	bio = rq->bio;

	memset(sense, 0, sizeof(sense));

	rq->sense = sense;

	rq->sense_len = 0;

	rq->retries = 0;



	start_time = jiffies;
@@ -316,31 +369,9 @@ static int sg_io(struct file *file, request_queue_t *q, 
	 */

	blk_execute_rq(q, bd_disk, rq, 0);



	/* write to all output members */

	hdr->status = 0xff & rq->errors;

	hdr->masked_status = status_byte(rq->errors);

	hdr->msg_status = msg_byte(rq->errors);

	hdr->host_status = host_byte(rq->errors);

	hdr->driver_status = driver_byte(rq->errors);

	hdr->info = 0;

	if (hdr->masked_status || hdr->host_status || hdr->driver_status)

		hdr->info |= SG_INFO_CHECK;

	hdr->resid = rq->data_len;

	hdr->duration = ((jiffies - start_time) * 1000) / HZ;

	hdr->sb_len_wr = 0;



	if (rq->sense_len && hdr->sbp) {

		int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);



		if (!copy_to_user(hdr->sbp, rq->sense, len))

			hdr->sb_len_wr = len;

	}



	if (blk_rq_unmap_user(bio))

		ret = -EFAULT;



	/* may not have succeeded, but output values written to control

	 * structure (struct sg_io_hdr).  */

	return blk_complete_sghdr_rq(rq, hdr, bio);

out:

	blk_put_request(rq);

	return ret;
@@ -427,7 +458,7 @@ int sg_scsi_ioctl(struct file *file, struct request_queue *q, 
	if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))

		goto error;



	err = verify_command(file, rq->cmd);

	err = blk_verify_command(rq->cmd, file->f_mode & FMODE_WRITE);

	if (err)

		goto error;
@@ -454,7 +485,7 @@ int sg_scsi_ioctl(struct file *file, struct request_queue *q, 
		rq->retries = 1;

		break;

	default:

		rq->timeout = BLK_DEFAULT_TIMEOUT;

		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;

		break;

	}
@@ -501,7 +532,7 @@ static int __blk_send_generic(request_queue_t *q, struct gendisk *bd_disk, int c 
	rq->cmd_type = REQ_TYPE_BLOCK_PC;

	rq->data = NULL;

	rq->data_len = 0;

	rq->timeout = BLK_DEFAULT_TIMEOUT;

	rq->timeout = BLK_DEFAULT_SG_TIMEOUT;

	memset(rq->cmd, 0, sizeof(rq->cmd));

	rq->cmd[0] = cmd;

	rq->cmd[4] = data;
@@ -517,16 +548,12 @@ static inline int blk_send_start_stop(request_queue_t *q, struct gendisk *bd_dis 
	return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);

}



int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)

int scsi_cmd_ioctl(struct file *file, struct request_queue *q,

		   struct gendisk *bd_disk, unsigned int cmd, void __user *arg)

{

	request_queue_t *q;

	int err;



	q = bd_disk->queue;

	if (!q)

		return -ENXIO;



	if (blk_get_queue(q))

	if (!q || blk_get_queue(q))

		return -ENXIO;



	switch (cmd) {