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:
  bsg: fix missing space in version print
  Don't define empty struct bsg_class_device if !CONFIG_BLK_DEV_BSG
  bsg: Kconfig updates
  bsg: minor cleanup
  bsg: device hash table cleanup
  bsg: fix initialization error handling bugs
  bsg: mark FUJITA Tomonori as bsg maintainer
  bsg: convert to dynamic major
  bsg: address various review comments

2 files changed, 83 insertions, 97 deletions

diff --git a/block/Kconfig b/block/Kconfig
index 6597b60e8e69..0768741d6813 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -52,11 +52,16 @@ config LSF
 endif # BLOCK
 
 config BLK_DEV_BSG
-        bool "Block layer SG support"
+        bool "Block layer SG support v4 (EXPERIMENTAL)"
         depends on (SCSI=y) && EXPERIMENTAL
-        default y
         ---help---
-        Saying Y here will enable generic SG (SCSI generic) v4
-        support for any block device.
+        Saying Y here will enable generic SG (SCSI generic) v4 support
+        for any block device.
+
+        Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
+        can handle complicated SCSI commands: tagged variable length cdbs
+        with bidirectional data transfers and generic request/response
+        protocols (e.g. Task Management Functions and SMP in Serial
+        Attached SCSI).
 
 source block/Kconfig.iosched
diff --git a/block/bsg.c b/block/bsg.c
index 576933fe1860..baa04e7adf19 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -33,7 +33,8 @@
 #include <scsi/scsi_driver.h>
 #include <scsi/sg.h>
 
-static char bsg_version[] = "block layer sg (bsg) 0.4";
+#define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver"
+#define BSG_VERSION     "0.4"
 
 struct bsg_device {
         request_queue_t *queue;
@@ -68,22 +69,15 @@ enum {
 #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];
+#define BSG_LIST_ARRAY_SIZE     8
+static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE];
 
 static struct class *bsg_class;
 static LIST_HEAD(bsg_class_list);
+static int bsg_major;
 
 static struct kmem_cache *bsg_cmd_cachep;
 
@@ -128,7 +122,7 @@ static struct bsg_command *bsg_alloc_command(struct bsg_device *bd)
         bd->queued_cmds++;
         spin_unlock_irq(&bd->lock);
 
-        bc = kmem_cache_alloc(bsg_cmd_cachep, GFP_USER);
+        bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL);
         if (unlikely(!bc)) {
                 spin_lock_irq(&bd->lock);
                 bd->queued_cmds--;
@@ -136,7 +130,6 @@ static struct bsg_command *bsg_alloc_command(struct bsg_device *bd)
                 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);
@@ -146,22 +139,12 @@ out:
         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)
+static inline struct hlist_head *bsg_dev_idx_hash(int index)
 {
-        bd->done_cmds++;
-        list_add_tail(&bc->list, &bd->done_list);
-        wake_up(&bd->wq_done);
+        return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)];
 }
 
-static inline int bsg_io_schedule(struct bsg_device *bd, int state)
+static int bsg_io_schedule(struct bsg_device *bd)
 {
         DEFINE_WAIT(wait);
         int ret = 0;
@@ -186,14 +169,11 @@ static inline int bsg_io_schedule(struct bsg_device *bd, int state)
                 goto unlock;
         }
 
-        prepare_to_wait(&bd->wq_done, &wait, state);
+        prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE);
         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);
@@ -272,7 +252,7 @@ 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 */
+        int ret, rw;
         unsigned int dxfer_len;
         void *dxferp = NULL;
 
@@ -354,9 +334,11 @@ static void bsg_rq_end_io(struct request *rq, int 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);
+        list_move_tail(&bc->list, &bd->done_list);
+        bd->done_cmds++;
         spin_unlock_irqrestore(&bd->lock, flags);
+
+        wake_up(&bd->wq_done);
 }
 
 /*
@@ -387,14 +369,15 @@ static void bsg_add_command(struct bsg_device *bd, request_queue_t *q,
         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)
+static 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);
+                bc = list_entry(bd->done_list.next, struct bsg_command, list);
+                list_del(&bc->list);
+                bd->done_cmds--;
         }
         spin_unlock_irq(&bd->lock);
 
@@ -450,8 +433,8 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
         hdr->response_len = 0;
 
         if (rq->sense_len && hdr->response) {
-                int len = min((unsigned int) hdr->max_response_len,
-                              rq->sense_len);
+                int len = min_t(unsigned int, hdr->max_response_len,
+                                        rq->sense_len);
 
                 ret = copy_to_user((void*)(unsigned long)hdr->response,
                                    rq->sense, len);
@@ -486,7 +469,7 @@ static int bsg_complete_all_commands(struct bsg_device *bd)
          */
         ret = 0;
         do {
-                ret = bsg_io_schedule(bd, TASK_UNINTERRUPTIBLE);
+                ret = bsg_io_schedule(bd);
                 /*
                  * look for -ENODATA specifically -- we'll sometimes get
                  * -ERESTARTSYS when we've taken a signal, but we can't
@@ -523,7 +506,7 @@ static int bsg_complete_all_commands(struct bsg_device *bd)
         return ret;
 }
 
-static ssize_t
+static int
 __bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
            const struct iovec *iov, ssize_t *bytes_read)
 {
@@ -550,7 +533,7 @@ __bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
                 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)))
+                if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr)))
                         ret = -EFAULT;
 
                 bsg_free_command(bc);
@@ -582,6 +565,9 @@ static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file)
                 clear_bit(BSG_F_WRITE_PERM, &bd->flags);
 }
 
+/*
+ * Check if the error is a "real" error that we should return.
+ */
 static inline int err_block_err(int ret)
 {
         if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN)
@@ -610,8 +596,8 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
         return bytes_read;
 }
 
-static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
-                           size_t count, ssize_t *bytes_read)
+static int __bsg_write(struct bsg_device *bd, const char __user *buf,
+                       size_t count, ssize_t *bytes_written)
 {
         struct bsg_command *bc;
         struct request *rq;
@@ -655,7 +641,7 @@ static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
                 rq = NULL;
                 nr_commands--;
                 buf += sizeof(struct sg_io_v4);
-                *bytes_read += sizeof(struct sg_io_v4);
+                *bytes_written += sizeof(struct sg_io_v4);
         }
 
         if (bc)
@@ -668,7 +654,7 @@ 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;
+        ssize_t bytes_written;
         int ret;
 
         dprintk("%s: write %Zd bytes\n", bd->name, count);
@@ -676,18 +662,18 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
         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;
+        bytes_written = 0;
+        ret = __bsg_write(bd, buf, count, &bytes_written);
+        *ppos = bytes_written;
 
         /*
          * return bytes written on non-fatal errors
          */
-        if (!bytes_read || (bytes_read && err_block_err(ret)))
-                bytes_read = ret;
+        if (!bytes_written || (bytes_written && err_block_err(ret)))
+                bytes_written = ret;
 
-        dprintk("%s: returning %Zd\n", bd->name, bytes_read);
-        return bytes_read;
+        dprintk("%s: returning %Zd\n", bd->name, bytes_written);
+        return bytes_written;
 }
 
 static struct bsg_device *bsg_alloc_device(void)
@@ -746,7 +732,7 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
                                          struct request_queue *rq,
                                          struct file *file)
 {
-        struct bsg_device *bd = NULL;
+        struct bsg_device *bd;
 #ifdef BSG_DEBUG
         unsigned char buf[32];
 #endif
@@ -762,7 +748,7 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
         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)]);
+        hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(bd->minor));
 
         strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1);
         dprintk("bound to <%s>, max queue %d\n",
@@ -774,13 +760,12 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
 
 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) {
+        hlist_for_each(entry, bsg_dev_idx_hash(minor)) {
                 bd = hlist_entry(entry, struct bsg_device, dev_list);
                 if (bd->minor == minor) {
                         atomic_inc(&bd->ref_count);
@@ -858,16 +843,11 @@ static unsigned int bsg_poll(struct file *file, poll_table *wait)
         return mask;
 }
 
-static int
-bsg_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-          unsigned long arg)
+static long bsg_ioctl(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
@@ -944,7 +924,7 @@ static struct file_operations bsg_fops = {
         .poll           =       bsg_poll,
         .open           =       bsg_open,
         .release        =       bsg_release,
-        .ioctl          =       bsg_ioctl,
+        .unlocked_ioctl =       bsg_ioctl,
         .owner          =       THIS_MODULE,
 };
 
@@ -952,12 +932,11 @@ void bsg_unregister_queue(struct request_queue *q)
 {
         struct bsg_class_device *bcd = &q->bsg_dev;
 
-        if (!bcd->class_dev)
-                return;
+        WARN_ON(!bcd->class_dev);
 
         mutex_lock(&bsg_mutex);
         sysfs_remove_link(&q->kobj, "bsg");
-        class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
+        class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor));
         bcd->class_dev = NULL;
         list_del_init(&bcd->list);
         bsg_device_nr--;
@@ -1003,7 +982,7 @@ retry:
                 bsg_minor_idx = 0;
 
         bcd->queue = q;
-        dev = MKDEV(BSG_MAJOR, bcd->minor);
+        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);
@@ -1024,7 +1003,7 @@ retry:
         return 0;
 err:
         if (class_dev)
-                class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
+                class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor));
         mutex_unlock(&bsg_mutex);
         return ret;
 }
@@ -1061,6 +1040,7 @@ static struct cdev bsg_cdev = {
 static int __init bsg_init(void)
 {
         int ret, i;
+        dev_t devid;
 
         bsg_cmd_cachep = kmem_cache_create("bsg_cmd",
                                 sizeof(struct bsg_command), 0, 0, NULL, NULL);
@@ -1069,46 +1049,47 @@ static int __init bsg_init(void)
                 return -ENOMEM;
         }
 
-        for (i = 0; i < BSG_LIST_SIZE; i++)
+        for (i = 0; i < BSG_LIST_ARRAY_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 = PTR_ERR(bsg_class);
+                goto destroy_kmemcache;
         }
 
-        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;
-        }
+        ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg");
+        if (ret)
+                goto destroy_bsg_class;
+
+        bsg_major = MAJOR(devid);
 
         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 = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS);
+        if (ret)
+                goto unregister_chrdev;
 
         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;
-        }
+        if (ret)
+                goto remove_cdev;
 
-        printk(KERN_INFO "%s loaded\n", bsg_version);
+        printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION
+               " loaded (major %d)\n", bsg_major);
         return 0;
+remove_cdev:
+        printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
+        cdev_del(&bsg_cdev);
+unregister_chrdev:
+        unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS);
+destroy_bsg_class:
+        class_destroy(bsg_class);
+destroy_kmemcache:
+        kmem_cache_destroy(bsg_cmd_cachep);
+        return ret;
 }
 
 MODULE_AUTHOR("Jens Axboe");
-MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver");
+MODULE_DESCRIPTION(BSG_DESCRIPTION);
 MODULE_LICENSE("GPL");
 
 device_initcall(bsg_init);