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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
This commit is contained in:
Linus Torvalds
commit
f3d9071667
@ -913,6 +913,12 @@ M: mchan@broadcom.com
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L: netdev@vger.kernel.org
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S: Supported
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BSG (block layer generic sg v4 driver)
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P: FUJITA Tomonori
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M: fujita.tomonori@lab.ntt.co.jp
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L: linux-scsi@vger.kernel.org
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S: Supported
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BTTV VIDEO4LINUX DRIVER
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P: Mauro Carvalho Chehab
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M: mchehab@infradead.org
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@ -52,11 +52,16 @@ config LSF
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endif # BLOCK
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config BLK_DEV_BSG
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bool "Block layer SG support"
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bool "Block layer SG support v4 (EXPERIMENTAL)"
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depends on (SCSI=y) && EXPERIMENTAL
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default y
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---help---
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Saying Y here will enable generic SG (SCSI generic) v4
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support for any block device.
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Saying Y here will enable generic SG (SCSI generic) v4 support
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for any block device.
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Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
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can handle complicated SCSI commands: tagged variable length cdbs
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with bidirectional data transfers and generic request/response
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protocols (e.g. Task Management Functions and SMP in Serial
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Attached SCSI).
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source block/Kconfig.iosched
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167
block/bsg.c
167
block/bsg.c
@ -33,7 +33,8 @@
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#include <scsi/scsi_driver.h>
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#include <scsi/sg.h>
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static char bsg_version[] = "block layer sg (bsg) 0.4";
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#define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver"
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#define BSG_VERSION "0.4"
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struct bsg_device {
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request_queue_t *queue;
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@ -68,22 +69,15 @@ enum {
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#define dprintk(fmt, args...)
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#endif
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#define list_entry_bc(entry) list_entry((entry), struct bsg_command, list)
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/*
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* just for testing
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*/
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#define BSG_MAJOR (240)
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static DEFINE_MUTEX(bsg_mutex);
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static int bsg_device_nr, bsg_minor_idx;
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#define BSG_LIST_SIZE (8)
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#define bsg_list_idx(minor) ((minor) & (BSG_LIST_SIZE - 1))
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static struct hlist_head bsg_device_list[BSG_LIST_SIZE];
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#define BSG_LIST_ARRAY_SIZE 8
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static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE];
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static struct class *bsg_class;
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static LIST_HEAD(bsg_class_list);
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static int bsg_major;
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static struct kmem_cache *bsg_cmd_cachep;
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@ -128,7 +122,7 @@ static struct bsg_command *bsg_alloc_command(struct bsg_device *bd)
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bd->queued_cmds++;
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spin_unlock_irq(&bd->lock);
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bc = kmem_cache_alloc(bsg_cmd_cachep, GFP_USER);
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bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL);
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if (unlikely(!bc)) {
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spin_lock_irq(&bd->lock);
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bd->queued_cmds--;
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@ -136,7 +130,6 @@ static struct bsg_command *bsg_alloc_command(struct bsg_device *bd)
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goto out;
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}
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memset(bc, 0, sizeof(*bc));
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bc->bd = bd;
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INIT_LIST_HEAD(&bc->list);
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dprintk("%s: returning free cmd %p\n", bd->name, bc);
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@ -146,22 +139,12 @@ out:
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return bc;
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}
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static inline void
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bsg_del_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
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static inline struct hlist_head *bsg_dev_idx_hash(int index)
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{
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bd->done_cmds--;
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list_del(&bc->list);
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return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)];
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}
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static inline void
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bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
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{
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bd->done_cmds++;
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list_add_tail(&bc->list, &bd->done_list);
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wake_up(&bd->wq_done);
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}
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static inline int bsg_io_schedule(struct bsg_device *bd, int state)
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static int bsg_io_schedule(struct bsg_device *bd)
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{
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DEFINE_WAIT(wait);
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int ret = 0;
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@ -186,14 +169,11 @@ static inline int bsg_io_schedule(struct bsg_device *bd, int state)
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goto unlock;
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}
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prepare_to_wait(&bd->wq_done, &wait, state);
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prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE);
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spin_unlock_irq(&bd->lock);
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io_schedule();
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finish_wait(&bd->wq_done, &wait);
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if ((state == TASK_INTERRUPTIBLE) && signal_pending(current))
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ret = -ERESTARTSYS;
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return ret;
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unlock:
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spin_unlock_irq(&bd->lock);
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@ -272,7 +252,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
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{
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request_queue_t *q = bd->queue;
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struct request *rq, *next_rq = NULL;
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int ret, rw = 0; /* shut up gcc */
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int ret, rw;
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unsigned int dxfer_len;
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void *dxferp = NULL;
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@ -354,9 +334,11 @@ static void bsg_rq_end_io(struct request *rq, int uptodate)
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bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration);
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spin_lock_irqsave(&bd->lock, flags);
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list_del(&bc->list);
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bsg_add_done_cmd(bd, bc);
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list_move_tail(&bc->list, &bd->done_list);
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bd->done_cmds++;
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spin_unlock_irqrestore(&bd->lock, flags);
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wake_up(&bd->wq_done);
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}
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/*
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@ -387,14 +369,15 @@ static void bsg_add_command(struct bsg_device *bd, request_queue_t *q,
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blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io);
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}
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static inline struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
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static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
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{
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struct bsg_command *bc = NULL;
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spin_lock_irq(&bd->lock);
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if (bd->done_cmds) {
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bc = list_entry_bc(bd->done_list.next);
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bsg_del_done_cmd(bd, bc);
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bc = list_entry(bd->done_list.next, struct bsg_command, list);
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list_del(&bc->list);
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bd->done_cmds--;
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}
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spin_unlock_irq(&bd->lock);
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@ -450,8 +433,8 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
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hdr->response_len = 0;
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if (rq->sense_len && hdr->response) {
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int len = min((unsigned int) hdr->max_response_len,
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rq->sense_len);
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int len = min_t(unsigned int, hdr->max_response_len,
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rq->sense_len);
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ret = copy_to_user((void*)(unsigned long)hdr->response,
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rq->sense, len);
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@ -486,7 +469,7 @@ static int bsg_complete_all_commands(struct bsg_device *bd)
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*/
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ret = 0;
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do {
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ret = bsg_io_schedule(bd, TASK_UNINTERRUPTIBLE);
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ret = bsg_io_schedule(bd);
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/*
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* look for -ENODATA specifically -- we'll sometimes get
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* -ERESTARTSYS when we've taken a signal, but we can't
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@ -523,7 +506,7 @@ static int bsg_complete_all_commands(struct bsg_device *bd)
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return ret;
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}
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static ssize_t
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static int
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__bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
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const struct iovec *iov, ssize_t *bytes_read)
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{
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@ -550,7 +533,7 @@ __bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
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ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio,
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bc->bidi_bio);
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if (copy_to_user(buf, (char *) &bc->hdr, sizeof(bc->hdr)))
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if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr)))
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ret = -EFAULT;
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bsg_free_command(bc);
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@ -582,6 +565,9 @@ static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file)
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clear_bit(BSG_F_WRITE_PERM, &bd->flags);
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}
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/*
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* Check if the error is a "real" error that we should return.
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*/
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static inline int err_block_err(int ret)
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{
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if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN)
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@ -610,8 +596,8 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
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return bytes_read;
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}
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static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
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size_t count, ssize_t *bytes_read)
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static int __bsg_write(struct bsg_device *bd, const char __user *buf,
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size_t count, ssize_t *bytes_written)
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{
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struct bsg_command *bc;
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struct request *rq;
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@ -655,7 +641,7 @@ static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
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rq = NULL;
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nr_commands--;
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buf += sizeof(struct sg_io_v4);
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*bytes_read += sizeof(struct sg_io_v4);
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*bytes_written += sizeof(struct sg_io_v4);
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}
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if (bc)
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@ -668,7 +654,7 @@ static ssize_t
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bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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{
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struct bsg_device *bd = file->private_data;
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ssize_t bytes_read;
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ssize_t bytes_written;
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int ret;
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dprintk("%s: write %Zd bytes\n", bd->name, count);
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@ -676,18 +662,18 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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bsg_set_block(bd, file);
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bsg_set_write_perm(bd, file);
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bytes_read = 0;
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ret = __bsg_write(bd, buf, count, &bytes_read);
|
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*ppos = bytes_read;
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bytes_written = 0;
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ret = __bsg_write(bd, buf, count, &bytes_written);
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*ppos = bytes_written;
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|
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/*
|
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* return bytes written on non-fatal errors
|
||||
*/
|
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if (!bytes_read || (bytes_read && err_block_err(ret)))
|
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bytes_read = ret;
|
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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)
|
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@ -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);
|
||||
|
||||
@ -60,7 +60,6 @@ struct bsg_class_device {
|
||||
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
|
||||
|
||||
Loading…
Reference in New Issue
Block a user