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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 10:50:19 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 10:50:19 -0700
commite245befce7af0a1e1347079ed62695b059594bd4 (patch)
tree08270a503c8945b4e6ba142728dc289de2b55542
parent14dc5249728ff699b1ca4dac01ad416a350a147a (diff)
parent58ff411e0d21592565ac9ab34f33a434f26e018b (diff)
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 ...
-rw-r--r--block/Kconfig8
-rw-r--r--block/Makefile1
-rw-r--r--block/bsg.c1114
-rw-r--r--block/ll_rw_blk.c1
-rw-r--r--block/scsi_ioctl.c163
-rw-r--r--drivers/block/ub.c2
-rw-r--r--drivers/cdrom/cdrom.c3
-rw-r--r--drivers/ide/ide-floppy.c29
-rw-r--r--drivers/ide/ide.c10
-rw-r--r--drivers/scsi/sd.c2
-rw-r--r--drivers/scsi/st.c3
-rw-r--r--include/linux/blkdev.h26
-rw-r--r--include/linux/bsg.h70
13 files changed, 1341 insertions, 91 deletions
diff --git a/block/Kconfig b/block/Kconfig
index 285935134bc..1d16b08e150 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -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
diff --git a/block/Makefile b/block/Makefile
index 4b84d0d5947..959feeb253b 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -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
diff --git a/block/bsg.c b/block/bsg.c
new file mode 100644
index 00000000000..461c9f56f3e
--- /dev/null
+++ b/block/bsg.c
@@ -0,0 +1,1114 @@
+/*
+ * bsg.c - block layer implementation of the sg v3 interface
+ *
+ * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs
+ * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License version 2. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ */
+/*
+ * TODO
+ * - Should this get merged, block/scsi_ioctl.c will be migrated into
+ * this file. To keep maintenance down, it's easier to have them
+ * seperated right now.
+ *
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/file.h>
+#include <linux/blkdev.h>
+#include <linux/poll.h>
+#include <linux/cdev.h>
+#include <linux/percpu.h>
+#include <linux/uio.h>
+#include <linux/bsg.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/sg.h>
+
+static char bsg_version[] = "block layer sg (bsg) 0.4";
+
+struct bsg_device {
+ request_queue_t *queue;
+ spinlock_t lock;
+ struct list_head busy_list;
+ struct list_head done_list;
+ struct hlist_node dev_list;
+ atomic_t ref_count;
+ int minor;
+ int queued_cmds;
+ int done_cmds;
+ wait_queue_head_t wq_done;
+ wait_queue_head_t wq_free;
+ char name[BUS_ID_SIZE];
+ int max_queue;
+ unsigned long flags;
+};
+
+enum {
+ BSG_F_BLOCK = 1,
+ BSG_F_WRITE_PERM = 2,
+};
+
+#define BSG_DEFAULT_CMDS 64
+#define BSG_MAX_DEVS 32768
+
+#undef BSG_DEBUG
+
+#ifdef BSG_DEBUG
+#define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ##args)
+#else
+#define dprintk(fmt, args...)
+#endif
+
+#define list_entry_bc(entry) list_entry((entry), struct bsg_command, list)
+
+/*
+ * just for testing
+ */
+#define BSG_MAJOR (240)
+
+static DEFINE_MUTEX(bsg_mutex);
+static int bsg_device_nr, bsg_minor_idx;
+
+#define BSG_LIST_SIZE (8)
+#define bsg_list_idx(minor) ((minor) & (BSG_LIST_SIZE - 1))
+static struct hlist_head bsg_device_list[BSG_LIST_SIZE];
+
+static struct class *bsg_class;
+static LIST_HEAD(bsg_class_list);
+
+static struct kmem_cache *bsg_cmd_cachep;
+
+/*
+ * our internal command type
+ */
+struct bsg_command {
+ struct bsg_device *bd;
+ struct list_head list;
+ struct request *rq;
+ struct bio *bio;
+ struct bio *bidi_bio;
+ int err;
+ struct sg_io_v4 hdr;
+ struct sg_io_v4 __user *uhdr;
+ char sense[SCSI_SENSE_BUFFERSIZE];
+};
+
+static void bsg_free_command(struct bsg_command *bc)
+{
+ struct bsg_device *bd = bc->bd;
+ unsigned long flags;
+
+ kmem_cache_free(bsg_cmd_cachep, bc);
+
+ spin_lock_irqsave(&bd->lock, flags);
+ bd->queued_cmds--;
+ spin_unlock_irqrestore(&bd->lock, flags);
+
+ wake_up(&bd->wq_free);
+}
+
+static struct bsg_command *bsg_alloc_command(struct bsg_device *bd)
+{
+ struct bsg_command *bc = ERR_PTR(-EINVAL);
+
+ spin_lock_irq(&bd->lock);
+
+ if (bd->queued_cmds >= bd->max_queue)
+ goto out;
+
+ bd->queued_cmds++;
+ spin_unlock_irq(&bd->lock);
+
+ bc = kmem_cache_alloc(bsg_cmd_cachep, GFP_USER);
+ if (unlikely(!bc)) {
+ spin_lock_irq(&bd->lock);
+ bd->queued_cmds--;
+ bc = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ memset(bc, 0, sizeof(*bc));
+ bc->bd = bd;
+ INIT_LIST_HEAD(&bc->list);
+ dprintk("%s: returning free cmd %p\n", bd->name, bc);
+ return bc;
+out:
+ spin_unlock_irq(&bd->lock);
+ return bc;
+}
+
+static inline void
+bsg_del_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
+{
+ bd->done_cmds--;
+ list_del(&bc->list);
+}
+
+static inline void
+bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
+{
+ bd->done_cmds++;
+ list_add_tail(&bc->list, &bd->done_list);
+ wake_up(&bd->wq_done);
+}
+
+static inline int bsg_io_schedule(struct bsg_device *bd, int state)
+{
+ DEFINE_WAIT(wait);
+ int ret = 0;
+
+ spin_lock_irq(&bd->lock);
+
+ BUG_ON(bd->done_cmds > bd->queued_cmds);
+
+ /*
+ * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no
+ * work to do", even though we return -ENOSPC after this same test
+ * during bsg_write() -- there, it means our buffer can't have more
+ * bsg_commands added to it, thus has no space left.
+ */
+ if (bd->done_cmds == bd->queued_cmds) {
+ ret = -ENODATA;
+ goto unlock;
+ }
+
+ if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
+ ret = -EAGAIN;
+ goto unlock;
+ }
+
+ prepare_to_wait(&bd->wq_done, &wait, state);
+ spin_unlock_irq(&bd->lock);
+ io_schedule();
+ finish_wait(&bd->wq_done, &wait);
+
+ if ((state == TASK_INTERRUPTIBLE) && signal_pending(current))
+ ret = -ERESTARTSYS;
+
+ return ret;
+unlock:
+ spin_unlock_irq(&bd->lock);
+ return ret;
+}
+
+static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq,
+ struct sg_io_v4 *hdr, int has_write_perm)
+{
+ memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
+
+ if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
+ hdr->request_len))
+ return -EFAULT;
+
+ if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) {
+ if (blk_verify_command(rq->cmd, has_write_perm))
+ return -EPERM;
+ } else if (!capable(CAP_SYS_RAWIO))
+ return -EPERM;
+
+ /*
+ * fill in request structure
+ */
+ rq->cmd_len = hdr->request_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;
+}
+
+/*
+ * Check if sg_io_v4 from user is allowed and valid
+ */
+static int
+bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw)
+{
+ int ret = 0;
+
+ if (hdr->guard != 'Q')
+ return -EINVAL;
+ if (hdr->request_len > BLK_MAX_CDB)
+ return -EINVAL;
+ if (hdr->dout_xfer_len > (q->max_sectors << 9) ||
+ hdr->din_xfer_len > (q->max_sectors << 9))
+ return -EIO;
+
+ switch (hdr->protocol) {
+ case BSG_PROTOCOL_SCSI:
+ switch (hdr->subprotocol) {
+ case BSG_SUB_PROTOCOL_SCSI_CMD:
+ case BSG_SUB_PROTOCOL_SCSI_TRANSPORT:
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ *rw = hdr->dout_xfer_len ? WRITE : READ;
+ return ret;
+}
+
+/*
+ * map sg_io_v4 to a request.
+ */
+static struct request *
+bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
+{
+ request_queue_t *q = bd->queue;
+ struct request *rq, *next_rq = NULL;
+ int ret, rw = 0; /* shut up gcc */
+ unsigned int dxfer_len;
+ void *dxferp = NULL;
+
+ dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
+ hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
+ hdr->din_xfer_len);
+
+ ret = bsg_validate_sgv4_hdr(q, hdr, &rw);
+ if (ret)
+ return ERR_PTR(ret);
+
+ /*
+ * map scatter-gather elements seperately and string them to request
+ */
+ rq = blk_get_request(q, rw, GFP_KERNEL);
+ if (!rq)
+ return ERR_PTR(-ENOMEM);
+ ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM,
+ &bd->flags));
+ if (ret)
+ goto out;
+
+ if (rw == WRITE && hdr->din_xfer_len) {
+ if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ next_rq = blk_get_request(q, READ, GFP_KERNEL);
+ if (!next_rq) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ rq->next_rq = next_rq;
+
+ dxferp = (void*)(unsigned long)hdr->din_xferp;
+ ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len);
+ if (ret)
+ goto out;
+ }
+
+ if (hdr->dout_xfer_len) {
+ dxfer_len = hdr->dout_xfer_len;
+ dxferp = (void*)(unsigned long)hdr->dout_xferp;
+ } else if (hdr->din_xfer_len) {
+ dxfer_len = hdr->din_xfer_len;
+ dxferp = (void*)(unsigned long)hdr->din_xferp;
+ } else
+ dxfer_len = 0;
+
+ if (dxfer_len) {
+ ret = blk_rq_map_user(q, rq, dxferp, dxfer_len);
+ if (ret)
+ goto out;
+ }
+ return rq;
+out:
+ blk_put_request(rq);
+ if (next_rq) {
+ blk_rq_unmap_user(next_rq->bio);
+ blk_put_request(next_rq);
+ }
+ return ERR_PTR(ret);
+}
+
+/*
+ * async completion call-back from the block layer, when scsi/ide/whatever
+ * calls end_that_request_last() on a request
+ */
+static void bsg_rq_end_io(struct request *rq, int uptodate)
+{
+ struct bsg_command *bc = rq->end_io_data;
+ struct bsg_device *bd = bc->bd;
+ unsigned long flags;
+
+ dprintk("%s: finished rq %p bc %p, bio %p stat %d\n",
+ bd->name, rq, bc, bc->bio, uptodate);
+
+ bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration);
+
+ spin_lock_irqsave(&bd->lock, flags);
+ list_del(&bc->list);
+ bsg_add_done_cmd(bd, bc);
+ spin_unlock_irqrestore(&bd->lock, flags);
+}
+
+/*
+ * do final setup of a 'bc' and submit the matching 'rq' to the block
+ * layer for io
+ */
+static void bsg_add_command(struct bsg_device *bd, request_queue_t *q,
+ struct bsg_command *bc, struct request *rq)
+{
+ rq->sense = bc->sense;
+ rq->sense_len = 0;
+
+ /*
+ * add bc command to busy queue and submit rq for io
+ */
+ bc->rq = rq;
+ bc->bio = rq->bio;
+ if (rq->next_rq)
+ bc->bidi_bio = rq->next_rq->bio;
+ bc->hdr.duration = jiffies;
+ spin_lock_irq(&bd->lock);
+ list_add_tail(&bc->list, &bd->busy_list);
+ spin_unlock_irq(&bd->lock);
+
+ dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc);
+
+ rq->end_io_data = bc;
+ blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io);
+}
+
+static inline struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
+{
+ struct bsg_command *bc = NULL;
+
+ spin_lock_irq(&bd->lock);
+ if (bd->done_cmds) {
+ bc = list_entry_bc(bd->done_list.next);
+ bsg_del_done_cmd(bd, bc);
+ }
+ spin_unlock_irq(&bd->lock);
+
+ return bc;
+}
+
+/*
+ * Get a finished command from the done list
+ */
+static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd)
+{
+ struct bsg_command *bc;
+ int ret;
+
+ do {
+ bc = bsg_next_done_cmd(bd);
+ if (bc)
+ break;
+
+ if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
+ bc = ERR_PTR(-EAGAIN);
+ break;
+ }
+
+ ret = wait_event_interruptible(bd->wq_done, bd->done_cmds);
+ if (ret) {
+ bc = ERR_PTR(-ERESTARTSYS);
+ break;
+ }
+ } while (1);
+
+ dprintk("%s: returning done %p\n", bd->name, bc);
+
+ return bc;
+}
+
+static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
+ struct bio *bio, struct bio *bidi_bio)
+{
+ int ret = 0;
+
+ dprintk("rq %p bio %p %u\n", rq, bio, rq->errors);
+ /*
+ * fill in all the output members
+ */
+ hdr->device_status = status_byte(rq->errors);
+ hdr->transport_status = host_byte(rq->errors);
+ hdr->driver_status = driver_byte(rq->errors);
+ hdr->info = 0;
+ if (hdr->device_status || hdr->transport_status || hdr->driver_status)
+ hdr->info |= SG_INFO_CHECK;
+ hdr->din_resid = rq->data_len;
+ hdr->response_len = 0;
+
+ if (rq->sense_len && hdr->response) {
+ int len = min((unsigned int) hdr->max_response_len,
+ rq->sense_len);
+
+ ret = copy_to_user((void*)(unsigned long)hdr->response,
+ rq->sense, len);
+ if (!ret)
+ hdr->response_len = len;
+ else
+ ret = -EFAULT;
+ }
+
+ if (rq->next_rq) {
+ blk_rq_unmap_user(bidi_bio);
+ blk_put_request(rq->next_rq);
+ }
+
+ blk_rq_unmap_user(bio);
+ blk_put_request(rq);
+
+ return ret;
+}
+
+static int bsg_complete_all_commands(struct bsg_device *bd)
+{
+ struct bsg_command *bc;
+ int ret, tret;
+
+ dprintk("%s: entered\n", bd->name);
+
+ set_bit(BSG_F_BLOCK, &bd->flags);
+
+ /*
+ * wait for all commands to complete
+ */
+ ret = 0;
+ do {
+ ret = bsg_io_schedule(bd, TASK_UNINTERRUPTIBLE);
+ /*
+ * look for -ENODATA specifically -- we'll sometimes get
+ * -ERESTARTSYS when we've taken a signal, but we can't
+ * return until we're done freeing the queue, so ignore
+ * it. The signal will get handled when we're done freeing
+ * the bsg_device.
+ */
+ } while (ret != -ENODATA);
+
+ /*
+ * discard done commands
+ */
+ ret = 0;
+ do {
+ spin_lock_irq(&bd->lock);
+ if (!bd->queued_cmds) {
+ spin_unlock_irq(&bd->lock);
+ break;
+ }
+ spin_unlock_irq(&bd->lock);
+
+ bc = bsg_get_done_cmd(bd);
+ if (IS_ERR(bc))
+ break;
+
+ tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio,
+ bc->bidi_bio);
+ if (!ret)
+ ret = tret;
+
+ bsg_free_command(bc);
+ } while (1);
+
+ return ret;
+}
+
+static ssize_t
+__bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
+ const struct iovec *iov, ssize_t *bytes_read)
+{
+ struct bsg_command *bc;
+ int nr_commands, ret;
+
+ if (count % sizeof(struct sg_io_v4))
+ return -EINVAL;
+
+ ret = 0;
+ nr_commands = count / sizeof(struct sg_io_v4);
+ while (nr_commands) {
+ bc = bsg_get_done_cmd(bd);
+ if (IS_ERR(bc)) {
+ ret = PTR_ERR(bc);
+ break;
+ }
+
+ /*
+ * this is the only case where we need to copy data back
+ * after completing the request. so do that here,
+ * bsg_complete_work() cannot do that for us
+ */
+ ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio,
+ bc->bidi_bio);
+
+ if (copy_to_user(buf, (char *) &bc->hdr, sizeof(bc->hdr)))
+ ret = -EFAULT;
+
+ bsg_free_command(bc);
+
+ if (ret)
+ break;
+
+ buf += sizeof(struct sg_io_v4);
+ *bytes_read += sizeof(struct sg_io_v4);
+ nr_commands--;
+ }
+
+ return ret;
+}
+
+static inline void bsg_set_block(struct bsg_device *bd, struct file *file)
+{
+ if (file->f_flags & O_NONBLOCK)
+ clear_bit(BSG_F_BLOCK, &bd->flags);
+ else
+ set_bit(BSG_F_BLOCK, &bd->flags);
+}
+
+static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file)
+{
+ if (file->f_mode & FMODE_WRITE)
+ set_bit(BSG_F_WRITE_PERM, &bd->flags);
+ else
+ clear_bit(BSG_F_WRITE_PERM, &bd->flags);
+}
+
+static inline int err_block_err(int ret)
+{
+ if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN)
+ return 1;
+
+ return 0;
+}
+
+static ssize_t
+bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+ struct bsg_device *bd = file->private_data;
+ int ret;
+ ssize_t bytes_read;
+
+ dprintk("%s: read %Zd bytes\n", bd->name, count);
+
+ bsg_set_block(bd, file);
+ bytes_read = 0;
+ ret = __bsg_read(buf, count, bd, NULL, &bytes_read);
+ *ppos = bytes_read;
+
+ if (!bytes_read || (bytes_read && err_block_err(ret)))
+ bytes_read = ret;
+
+ return bytes_read;
+}
+
+static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
+ size_t count, ssize_t *bytes_read)
+{
+ struct bsg_command *bc;
+ struct request *rq;
+ int ret, nr_commands;
+
+ if (count % sizeof(struct sg_io_v4))
+ return -EINVAL;
+
+ nr_commands = count / sizeof(struct sg_io_v4);
+ rq = NULL;
+ bc = NULL;
+ ret = 0;
+ while (nr_commands) {
+ request_queue_t *q = bd->queue;
+
+ bc = bsg_alloc_command(bd);
+ if (IS_ERR(bc)) {
+ ret = PTR_ERR(bc);
+ bc = NULL;
+ break;
+ }
+
+ bc->uhdr = (struct sg_io_v4 __user *) buf;
+ if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) {
+ ret = -EFAULT;
+ break;
+ }
+
+ /*
+ * get a request, fill in the blanks, and add to request queue
+ */
+ rq = bsg_map_hdr(bd, &bc->hdr);
+ if (IS_ERR(rq)) {
+ ret = PTR_ERR(rq);
+ rq = NULL;
+ break;
+ }
+
+ bsg_add_command(bd, q, bc, rq);
+ bc = NULL;
+ rq = NULL;
+ nr_commands--;
+ buf += sizeof(struct sg_io_v4);
+ *bytes_read += sizeof(struct sg_io_v4);
+ }
+
+ if (bc)
+ bsg_free_command(bc);
+
+ return ret;
+}
+
+static ssize_t
+bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+ struct bsg_device *bd = file->private_data;
+ ssize_t bytes_read;
+ int ret;
+
+ dprintk("%s: write %Zd bytes\n", bd->name, count);
+
+ bsg_set_block(bd, file);
+ bsg_set_write_perm(bd, file);
+
+ bytes_read = 0;
+ ret = __bsg_write(bd, buf, count, &bytes_read);
+ *ppos = bytes_read;
+
+ /*
+ * return bytes written on non-fatal errors
+ */
+ if (!bytes_read || (bytes_read && err_block_err(ret)))
+ bytes_read = ret;
+
+ dprintk("%s: returning %Zd\n", bd->name, bytes_read);
+ return bytes_read;
+}
+
+static struct bsg_device *bsg_alloc_device(void)
+{
+ struct bsg_device *bd;
+
+ bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL);
+ if (unlikely(!bd))
+ return NULL;
+
+ spin_lock_init(&bd->lock);
+
+ bd->max_queue = BSG_DEFAULT_CMDS;
+
+ INIT_LIST_HEAD(&bd->busy_list);
+ INIT_LIST_HEAD(&bd->done_list);
+ INIT_HLIST_NODE(&bd->dev_list);
+
+ init_waitqueue_head(&bd->wq_free);
+ init_waitqueue_head(&bd->wq_done);
+ return bd;
+}
+
+static int bsg_put_device(struct bsg_device *bd)
+{
+ int ret = 0;
+
+ mutex_lock(&bsg_mutex);
+
+ if (!atomic_dec_and_test(&bd->ref_count))
+ goto out;
+
+ dprintk("%s: tearing down\n", bd->name);
+
+ /*
+ * close can always block
+ */
+ set_bit(BSG_F_BLOCK, &bd->flags);
+
+ /*
+ * correct error detection baddies here again. it's the responsibility
+ * of the app to properly reap commands before close() if it wants
+ * fool-proof error detection
+ */
+ ret = bsg_complete_all_commands(bd);
+
+ blk_put_queue(bd->queue);
+ hlist_del(&bd->dev_list);
+ kfree(bd);
+out:
+ mutex_unlock(&bsg_mutex);
+ return ret;
+}
+
+static struct bsg_device *bsg_add_device(struct inode *inode,
+ struct request_queue *rq,
+ struct file *file)
+{
+ struct bsg_device *bd = NULL;
+#ifdef BSG_DEBUG
+ unsigned char buf[32];
+#endif
+
+ bd = bsg_alloc_device();
+ if (!bd)
+ return ERR_PTR(-ENOMEM);
+
+ bd->queue = rq;
+ kobject_get(&rq->kobj);
+ bsg_set_block(bd, file);
+
+ atomic_set(&bd->ref_count, 1);
+ bd->minor = iminor(inode);
+ mutex_lock(&bsg_mutex);
+ hlist_add_head(&bd->dev_list, &bsg_device_list[bsg_list_idx(bd->minor)]);
+
+ strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1);
+ dprintk("bound to <%s>, max queue %d\n",
+ format_dev_t(buf, inode->i_rdev), bd->max_queue);
+
+ mutex_unlock(&bsg_mutex);
+ return bd;
+}
+
+static struct bsg_device *__bsg_get_device(int minor)
+{
+ struct hlist_head *list = &bsg_device_list[bsg_list_idx(minor)];
+ struct bsg_device *bd = NULL;
+ struct hlist_node *entry;
+
+ mutex_lock(&bsg_mutex);
+
+ hlist_for_each(entry, list) {
+ bd = hlist_entry(entry, struct bsg_device, dev_list);
+ if (bd->minor == minor) {
+ atomic_inc(&bd->ref_count);
+ break;
+ }
+
+ bd = NULL;
+ }
+
+ mutex_unlock(&bsg_mutex);
+ return bd;
+}
+
+static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
+{
+ struct bsg_device *bd = __bsg_get_device(iminor(inode));
+ struct bsg_class_device *bcd, *__bcd;
+
+ if (bd)
+ return bd;
+
+ /*
+ * find the class device
+ */
+ bcd = NULL;
+ mutex_lock(&bsg_mutex);
+ list_for_each_entry(__bcd, &bsg_class_list, list) {
+ if (__bcd->minor == iminor(inode)) {
+ bcd = __bcd;
+ break;
+ }
+ }
+ mutex_unlock(&bsg_mutex);
+
+ if (!bcd)
+ return ERR_PTR(-ENODEV);
+
+ return bsg_add_device(inode, bcd->queue, file);
+}
+
+static int bsg_open(struct inode *inode, struct file *file)
+{
+ struct bsg_device *bd = bsg_get_device(inode, file);
+
+ if (IS_ERR(bd))
+ return PTR_ERR(bd);
+
+ file->private_data = bd;
+ return 0;
+}
+
+static int bsg_release(struct inode *inode, struct file *file)
+{
+ struct bsg_device *bd = file->private_data;
+
+ file->private_data = NULL;
+ return bsg_put_device(bd);
+}
+
+static unsigned int bsg_poll(struct file *file, poll_table *wait)
+{
+ struct bsg_device *bd = file->private_data;
+ unsigned int mask = 0;
+
+ poll_wait(file, &bd->wq_done, wait);
+ poll_wait(file, &bd->wq_free, wait);
+
+ spin_lock_irq(&bd->lock);
+ if (!list_empty(&bd->done_list))
+ mask |= POLLIN | POLLRDNORM;
+ if (bd->queued_cmds >= bd->max_queue)
+ mask |= POLLOUT;
+ spin_unlock_irq(&bd->lock);
+
+ return mask;
+}
+
+static int
+bsg_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct bsg_device *bd = file->private_data;
+ int __user *uarg = (int __user *) arg;
+
+ if (!bd)
+ return -ENXIO;
+
+ switch (cmd) {
+ /*
+ * our own ioctls
+ */
+ case SG_GET_COMMAND_Q:
+ return put_user(bd->max_queue, uarg);
+ case SG_SET_COMMAND_Q: {
+ int queue;
+
+ if (get_user(queue, uarg))
+ return -EFAULT;
+ if (queue < 1)
+ return -EINVAL;
+
+ spin_lock_irq(&bd->lock);
+ bd->max_queue = queue;
+ spin_unlock_irq(&bd->lock);
+ return 0;
+ }
+
+ /*
+ * SCSI/sg ioctls
+ */
+ case SG_GET_VERSION_NUM:
+ case SCSI_IOCTL_GET_IDLUN:
+ case SCSI_IOCTL_GET_BUS_NUMBER:
+ case SG_SET_TIMEOUT:
+ case SG_GET_TIMEOUT:
+ case SG_GET_RESERVED_SIZE:
+ case SG_SET_RESERVED_SIZE:
+ case SG_EMULATED_HOST:
+ case SCSI_IOCTL_SEND_COMMAND: {
+ void __user *uarg = (void __user *) arg;
+ return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg);
+ }
+ case SG_IO: {
+ struct request *rq;
+ struct bio *bio, *bidi_bio = NULL;
+ struct sg_io_v4 hdr;
+
+ if (copy_from_user(&hdr, uarg, sizeof(hdr)))
+ return -EFAULT;
+
+ rq = bsg_map_hdr(bd, &hdr);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ bio = rq->bio;
+ if (rq->next_rq)
+ bidi_bio = rq->next_rq->bio;
+ blk_execute_rq(bd->queue, NULL, rq, 0);
+ blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
+
+ if (copy_to_user(uarg, &hdr, sizeof(hdr)))
+ return -EFAULT;
+
+ return 0;
+ }
+ /*
+ * block device ioctls
+ */
+ default:
+#if 0
+ return ioctl_by_bdev(bd->bdev, cmd, arg);
+#else
+ return -ENOTTY;
+#endif
+ }
+}
+
+static struct file_operations bsg_fops = {
+ .read = bsg_read,
+ .write = bsg_write,
+ .poll = bsg_poll,
+ .open = bsg_open,
+ .release = bsg_release,
+ .ioctl = bsg_ioctl,
+ .owner = THIS_MODULE,
+};
+
+void bsg_unregister_queue(struct request_queue *q)
+{
+ struct bsg_class_device *bcd = &q->bsg_dev;
+
+ if (!bcd->class_dev)
+ return;
+
+ mutex_lock(&bsg_mutex);
+ sysfs_remove_link(&q->kobj, "bsg");
+ class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
+ bcd->class_dev = NULL;
+ list_del_init(&bcd->list);
+ bsg_device_nr--;
+ mutex_unlock(&bsg_mutex);
+}
+EXPORT_SYMBOL_GPL(bsg_unregister_queue);
+
+int bsg_register_queue(struct request_queue *q, const char *name)
+{
+ struct bsg_class_device *bcd, *__bcd;
+ dev_t dev;
+ int ret = -EMFILE;
+ struct class_device *class_dev = NULL;
+
+ /*
+ * we need a proper transport to send commands, not a stacked device
+ */
+ if (!q->request_fn)
+ return 0;
+
+ bcd = &q->bsg_dev;
+ memset(bcd, 0, sizeof(*bcd));
+ INIT_LIST_HEAD(&bcd->list);
+
+ mutex_lock(&bsg_mutex);
+ if (bsg_device_nr == BSG_MAX_DEVS) {
+ printk(KERN_ERR "bsg: too many bsg devices\n");
+ goto err;
+ }
+
+retry:
+ list_for_each_entry(__bcd, &bsg_class_list, list) {
+ if (__bcd->minor == bsg_minor_idx) {
+ bsg_minor_idx++;
+ if (bsg_minor_idx == BSG_MAX_DEVS)
+ bsg_minor_idx = 0;
+ goto retry;
+ }
+ }
+
+ bcd->minor = bsg_minor_idx++;
+ if (bsg_minor_idx == BSG_MAX_DEVS)
+ bsg_minor_idx = 0;
+
+ bcd->queue = q;
+ dev = MKDEV(BSG_MAJOR, bcd->minor);
+ class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name);
+ if (IS_ERR(class_dev)) {
+ ret = PTR_ERR(class_dev);
+ goto err;
+ }
+ bcd->class_dev = class_dev;
+
+ if (q->kobj.dentry) {
+ ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
+ if (ret)
+ goto err;
+ }
+
+ list_add_tail(&bcd->list, &bsg_class_list);
+ bsg_device_nr++;
+
+ mutex_unlock(&bsg_mutex);
+ return 0;
+err:
+ if (class_dev)
+ class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
+ mutex_unlock(&bsg_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(bsg_register_queue);
+
+static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
+{
+ int ret;
+ struct scsi_device *sdp = to_scsi_device(cl_dev->dev);
+ struct request_queue *rq = sdp->request_queue;
+
+ if (rq->kobj.parent)
+ ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent));
+ else
+ ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj));
+ return ret;
+}
+
+static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
+{
+ bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue);
+}
+
+static struct class_interface bsg_intf = {
+ .add = bsg_add,
+ .remove = bsg_remove,
+};
+
+static struct cdev bsg_cdev = {
+ .kobj = {.name = "bsg", },
+ .owner = THIS_MODULE,
+};
+
+static int __init bsg_init(void)
+{
+ int ret, i;
+
+ bsg_cmd_cachep = kmem_cache_create("bsg_cmd",
+ sizeof(struct bsg_command), 0, 0, NULL, NULL);
+ if (!bsg_cmd_cachep) {
+ printk(KERN_ERR "bsg: failed creating slab cache\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < BSG_LIST_SIZE; i++)
+ INIT_HLIST_HEAD(&bsg_device_list[i]);
+
+ bsg_class = class_create(THIS_MODULE, "bsg");
+ if (IS_ERR(bsg_class)) {
+ kmem_cache_destroy(bsg_cmd_cachep);
+ return PTR_ERR(bsg_class);
+ }
+
+ ret = register_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS, "bsg");
+ if (ret) {
+ kmem_cache_destroy(bsg_cmd_cachep);
+ class_destroy(bsg_class);
+ return ret;
+ }
+
+ cdev_init(&bsg_cdev, &bsg_fops);
+ ret = cdev_add(&bsg_cdev, MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
+ if (ret) {
+ kmem_cache_destroy(bsg_cmd_cachep);
+ class_destroy(bsg_class);
+ unregister_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
+ return ret;
+ }
+
+ ret = scsi_register_interface(&bsg_intf);
+ if (ret) {
+ printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
+ kmem_cache_destroy(bsg_cmd_cachep);
+ class_destroy(bsg_class);
+ unregister_chrdev(BSG_MAJOR, "bsg");
+ return ret;
+ }
+
+ printk(KERN_INFO "%s loaded\n", bsg_version);
+ return 0;
+}
+
+MODULE_AUTHOR("Jens Axboe");
+MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver");
+MODULE_LICENSE("GPL");
+
+device_initcall(bsg_init);
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index ef42bb2b12b..11e4235d0b0 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -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;
}
/**
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index e83f1dbf7c2..a26ba07955f 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -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) {
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 18c8b6c0db2..8b13d7d2cb6 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -1709,7 +1709,7 @@ static int ub_bd_ioctl(struct inode *inode, struct file *filp,
struct gendisk *disk = inode->i_bdev->bd_disk;
void __user *usermem = (void __user *) arg;
- return scsi_cmd_ioctl(filp, disk, cmd, usermem);
+ return scsi_cmd_ioctl(filp, disk->queue, disk, cmd, usermem);
}
/*
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index aa5468f487b..499019bf8f4 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2695,11 +2695,12 @@ int cdrom_ioctl(struct file * file, struct cdrom_device_info *cdi,
{
void __user *argp = (void __user *)arg;
int ret;
+ struct gendisk *disk = ip->i_bdev->bd_disk;
/*
* Try the generic SCSI command ioctl's first.
*/
- ret = scsi_cmd_ioctl(file, ip->i_bdev->bd_disk, cmd, argp);
+ ret = scsi_cmd_ioctl(file, disk->queue, disk, cmd, argp);
if (ret != -ENOTTY)
return ret;
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index f429be88c4f..a21f585b1ca 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -1258,19 +1258,25 @@ static void idefloppy_create_rw_cmd (idefloppy_floppy_t *floppy, idefloppy_pc_t
set_bit(PC_DMA_RECOMMENDED, &pc->flags);
}
-static int
+static void
idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq)
{
- /*
- * just support eject for now, it would not be hard to make the
- * REQ_BLOCK_PC support fully-featured
- */
- if (rq->cmd[0] != IDEFLOPPY_START_STOP_CMD)
- return 1;
-
idefloppy_init_pc(pc);
+ pc->callback = &idefloppy_rw_callback;
memcpy(pc->c, rq->cmd, sizeof(pc->c));
- return 0;
+ pc->rq = rq;
+ pc->b_count = rq->data_len;
+ if (rq->data_len && rq_data_dir(rq) == WRITE)
+ set_bit(PC_WRITING, &pc->flags);
+ pc->buffer = rq->data;
+ if (rq->bio)
+ set_bit(PC_DMA_RECOMMENDED, &pc->flags);
+
+ /*
+ * possibly problematic, doesn't look like ide-floppy correctly
+ * handled scattered requests if dma fails...
+ */
+ pc->request_transfer = pc->buffer_size = rq->data_len;
}
/*
@@ -1317,10 +1323,7 @@ static ide_startstop_t idefloppy_do_request (ide_drive_t *drive, struct request
pc = (idefloppy_pc_t *) rq->buffer;
} else if (blk_pc_request(rq)) {
pc = idefloppy_next_pc_storage(drive);
- if (idefloppy_blockpc_cmd(floppy, pc, rq)) {
- idefloppy_do_end_request(drive, 0, 0);
- return ide_stopped;
- }
+ idefloppy_blockpc_cmd(floppy, pc, rq);
} else {
blk_dump_rq_flags(rq,
"ide-floppy: unsupported command in queue");
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index c948a5c17a5..8cd7694593c 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -1049,9 +1049,13 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
unsigned long flags;
ide_driver_t *drv;
void __user *p = (void __user *)arg;
- int err = 0, (*setfunc)(ide_drive_t *, int);
+ int err, (*setfunc)(ide_drive_t *, int);
u8 *val;
+ err = scsi_cmd_ioctl(file, bdev->bd_disk->queue, bdev->bd_disk, cmd, p);
+ if (err != -ENOTTY)
+ return err;
+
switch (cmd) {
case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val;
case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
@@ -1171,10 +1175,6 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
return 0;
}
- case CDROMEJECT:
- case CDROMCLOSETRAY:
- return scsi_cmd_ioctl(file, bdev->bd_disk, cmd, p);
-
case HDIO_GET_BUSSTATE:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 448d316f12d..424d557284a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -684,7 +684,7 @@ static int sd_ioctl(struct inode * inode, struct file * filp,
case SCSI_IOCTL_GET_BUS_NUMBER:
return scsi_ioctl(sdp, cmd, p);
default:
- error = scsi_cmd_ioctl(filp, disk, cmd, p);
+ error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
if (error != -ENOTTY)
return error;
}
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 55bfeccf68a..a4f7b846577 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -3549,7 +3549,8 @@ static int st_ioctl(struct inode *inode, struct file *file,
!capable(CAP_SYS_RAWIO))
i = -EPERM;
else
- i = scsi_cmd_ioctl(file, STp->disk, cmd_in, p);
+ i = scsi_cmd_ioctl(file, STp->disk->queue,
+ STp->disk, cmd_in, p);
if (i != -ENOTTY)
return i;
break;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index fae138bd220..b32564a1e10 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -14,6 +14,7 @@
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/stringify.h>
+#include <linux/bsg.h>
#include <asm/scatterlist.h>
@@ -41,6 +42,8 @@ struct elevator_queue;
typedef struct elevator_queue elevator_t;
struct request_pm_state;
struct blk_trace;
+struct request;
+struct sg_io_hdr;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
@@ -314,6 +317,9 @@ struct request {
*/
rq_end_io_fn *end_io;
void *end_io_data;
+
+ /* for bidi */
+ struct request *next_rq;
};
/*
@@ -468,6 +474,10 @@ struct request_queue
unsigned int bi_size;
struct mutex sysfs_lock;
+
+#if defined(CONFIG_BLK_DEV_BSG)
+ struct bsg_class_device bsg_dev;
+#endif
};
#define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */
@@ -479,6 +489,7 @@ struct request_queue
#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */
#define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */
#define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */
+#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */
enum {
/*
@@ -543,6 +554,7 @@ enum {
#define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED)
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
+#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
@@ -607,6 +619,11 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
#define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT)
#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
+/*
+ * default timeout for SG_IO if none specified
+ */
+#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
+
#ifdef CONFIG_MMU
extern int init_emergency_isa_pool(void);
extern void blk_queue_bounce(request_queue_t *q, struct bio **bio);
@@ -637,7 +654,8 @@ extern void blk_requeue_request(request_queue_t *, struct request *);
extern void blk_plug_device(request_queue_t *);
extern int blk_remove_plug(request_queue_t *);
extern void blk_recount_segments(request_queue_t *, struct bio *);
-extern int scsi_cmd_ioctl(struct file *, struct gendisk *, unsigned int, void __user *);
+extern int scsi_cmd_ioctl(struct file *, struct request_queue *,
+ struct gendisk *, unsigned int, void __user *);
extern int sg_scsi_ioctl(struct file *, struct request_queue *,
struct gendisk *, struct scsi_ioctl_command __user *);
@@ -680,6 +698,12 @@ extern int blk_execute_rq(request_queue_t *, struct gendisk *,
struct request *, int);
extern void blk_execute_rq_nowait(request_queue_t *, struct gendisk *,
struct request *, int, rq_end_io_fn *);
+extern int blk_fill_sghdr_rq(request_queue_t *, struct request *,
+ struct sg_io_hdr *, int);
+extern int blk_unmap_sghdr_rq(struct request *, struct sg_io_hdr *);
+extern int blk_complete_sghdr_rq(struct request *, struct sg_io_hdr *,
+ struct bio *);
+extern int blk_verify_command(unsigned char *, int);
static inline request_queue_t *bdev_get_queue(struct block_device *bdev)
{
diff --git a/include/linux/bsg.h b/include/linux/bsg.h
new file mode 100644
index 00000000000..bd998ca6cb2
--- /dev/null
+++ b/include/linux/bsg.h
@@ -0,0 +1,70 @@
+#ifndef BSG_H
+#define BSG_H
+
+#define BSG_PROTOCOL_SCSI 0
+
+#define BSG_SUB_PROTOCOL_SCSI_CMD 0
+#define BSG_SUB_PROTOCOL_SCSI_TMF 1
+#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
+
+struct sg_io_v4 {
+ __s32 guard; /* [i] 'Q' to differentiate from v3 */
+ __u32 protocol; /* [i] 0 -> SCSI , .... */
+ __u32 subprotocol; /* [i] 0 -> SCSI command, 1 -> SCSI task
+ management function, .... */
+
+ __u32 request_len; /* [i] in bytes */
+ __u64 request; /* [i], [*i] {SCSI: cdb} */
+ __u32 request_attr; /* [i] {SCSI: task attribute} */
+ __u32 request_tag; /* [i] {SCSI: task tag (only if flagged)} */
+ __u32 request_priority; /* [i] {SCSI: task priority} */
+ __u32 max_response_len; /* [i] in bytes */
+ __u64 response; /* [i], [*o] {SCSI: (auto)sense data} */
+
+ /* "din_" for data in (from device); "dout_" for data out (to device) */
+ __u32 dout_xfer_len; /* [i] bytes to be transferred to device */
+ __u32 din_xfer_len; /* [i] bytes to be transferred from device */
+ __u64 dout_xferp; /* [i], [*i] */
+ __u64 din_xferp; /* [i], [*o] */
+
+ __u32 timeout; /* [i] units: millisecond */
+ __u32 flags; /* [i] bit mask */
+ __u64 usr_ptr; /* [i->o] unused internally */
+ __u32 spare_in; /* [i] */
+
+ __u32 driver_status; /* [o] 0 -> ok */
+ __u32 transport_status; /* [o] 0 -> ok */
+ __u32 device_status; /* [o] {SCSI: command completion status} */
+ __u32 retry_delay; /* [o] {SCSI: status auxiliary information} */
+ __u32 info; /* [o] additional information */
+ __u32 duration; /* [o] time to complete, in milliseconds */
+ __u32 response_len; /* [o] bytes of response actually written */
+ __s32 din_resid; /* [o] actual_din_xfer_len - din_xfer_len */
+ __u32 generated_tag; /* [o] {SCSI: task tag that transport chose} */
+ __u32 spare_out; /* [o] */
+
+ __u32 padding;
+};
+
+#ifdef __KERNEL__
+
+#if defined(CONFIG_BLK_DEV_BSG)
+struct bsg_class_device {
+ struct class_device *class_dev;
+ struct device *dev;
+ int minor;
+ struct list_head list;
+ struct request_queue *queue;
+};
+
+extern int bsg_register_queue(struct request_queue *, const char *);
+extern void bsg_unregister_queue(struct request_queue *);
+#else
+struct bsg_class_device { };
+#define bsg_register_queue(disk, name) (0)
+#define bsg_unregister_queue(disk) do { } while (0)
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif