Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1 | /* |
FUJITA Tomonori | 0c6a89b | 2007-07-29 23:00:46 +0900 | [diff] [blame] | 2 | * bsg.c - block layer implementation of the sg v4 interface |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs |
| 5 | * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com> |
| 6 | * |
| 7 | * This file is subject to the terms and conditions of the GNU General Public |
| 8 | * License version 2. See the file "COPYING" in the main directory of this |
| 9 | * archive for more details. |
| 10 | * |
| 11 | */ |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/file.h> |
| 15 | #include <linux/blkdev.h> |
| 16 | #include <linux/poll.h> |
| 17 | #include <linux/cdev.h> |
| 18 | #include <linux/percpu.h> |
| 19 | #include <linux/uio.h> |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 20 | #include <linux/idr.h> |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 21 | #include <linux/bsg.h> |
| 22 | |
| 23 | #include <scsi/scsi.h> |
| 24 | #include <scsi/scsi_ioctl.h> |
| 25 | #include <scsi/scsi_cmnd.h> |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 26 | #include <scsi/scsi_device.h> |
| 27 | #include <scsi/scsi_driver.h> |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 28 | #include <scsi/sg.h> |
| 29 | |
FUJITA Tomonori | 0ed081c | 2007-07-17 12:21:35 +0200 | [diff] [blame] | 30 | #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" |
| 31 | #define BSG_VERSION "0.4" |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 32 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 33 | struct bsg_device { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 34 | struct request_queue *queue; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 35 | spinlock_t lock; |
| 36 | struct list_head busy_list; |
| 37 | struct list_head done_list; |
| 38 | struct hlist_node dev_list; |
| 39 | atomic_t ref_count; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 40 | int queued_cmds; |
| 41 | int done_cmds; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 42 | wait_queue_head_t wq_done; |
| 43 | wait_queue_head_t wq_free; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 44 | char name[BUS_ID_SIZE]; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 45 | int max_queue; |
| 46 | unsigned long flags; |
| 47 | }; |
| 48 | |
| 49 | enum { |
| 50 | BSG_F_BLOCK = 1, |
| 51 | BSG_F_WRITE_PERM = 2, |
| 52 | }; |
| 53 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 54 | #define BSG_DEFAULT_CMDS 64 |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 55 | #define BSG_MAX_DEVS 32768 |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 56 | |
| 57 | #undef BSG_DEBUG |
| 58 | |
| 59 | #ifdef BSG_DEBUG |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 60 | #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ##args) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 61 | #else |
| 62 | #define dprintk(fmt, args...) |
| 63 | #endif |
| 64 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 65 | static DEFINE_MUTEX(bsg_mutex); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 66 | static DEFINE_IDR(bsg_minor_idr); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 67 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 68 | #define BSG_LIST_ARRAY_SIZE 8 |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 69 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 70 | |
| 71 | static struct class *bsg_class; |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 72 | static int bsg_major; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 73 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 74 | static struct kmem_cache *bsg_cmd_cachep; |
| 75 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 76 | /* |
| 77 | * our internal command type |
| 78 | */ |
| 79 | struct bsg_command { |
| 80 | struct bsg_device *bd; |
| 81 | struct list_head list; |
| 82 | struct request *rq; |
| 83 | struct bio *bio; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 84 | struct bio *bidi_bio; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 85 | int err; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 86 | struct sg_io_v4 hdr; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 87 | char sense[SCSI_SENSE_BUFFERSIZE]; |
| 88 | }; |
| 89 | |
| 90 | static void bsg_free_command(struct bsg_command *bc) |
| 91 | { |
| 92 | struct bsg_device *bd = bc->bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 93 | unsigned long flags; |
| 94 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 95 | kmem_cache_free(bsg_cmd_cachep, bc); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 96 | |
| 97 | spin_lock_irqsave(&bd->lock, flags); |
| 98 | bd->queued_cmds--; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 99 | spin_unlock_irqrestore(&bd->lock, flags); |
| 100 | |
| 101 | wake_up(&bd->wq_free); |
| 102 | } |
| 103 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 104 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 105 | { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 106 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 107 | |
| 108 | spin_lock_irq(&bd->lock); |
| 109 | |
| 110 | if (bd->queued_cmds >= bd->max_queue) |
| 111 | goto out; |
| 112 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 113 | bd->queued_cmds++; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 114 | spin_unlock_irq(&bd->lock); |
| 115 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 116 | bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 117 | if (unlikely(!bc)) { |
| 118 | spin_lock_irq(&bd->lock); |
FUJITA Tomonori | 7e75d73 | 2007-01-24 09:05:54 +0100 | [diff] [blame] | 119 | bd->queued_cmds--; |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 120 | bc = ERR_PTR(-ENOMEM); |
FUJITA Tomonori | 7e75d73 | 2007-01-24 09:05:54 +0100 | [diff] [blame] | 121 | goto out; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 122 | } |
| 123 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 124 | bc->bd = bd; |
| 125 | INIT_LIST_HEAD(&bc->list); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 126 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 127 | return bc; |
| 128 | out: |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 129 | spin_unlock_irq(&bd->lock); |
| 130 | return bc; |
| 131 | } |
| 132 | |
FUJITA Tomonori | 1c1133e | 2007-07-17 12:21:15 +0200 | [diff] [blame] | 133 | static inline struct hlist_head *bsg_dev_idx_hash(int index) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 134 | { |
FUJITA Tomonori | 1c1133e | 2007-07-17 12:21:15 +0200 | [diff] [blame] | 135 | return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 136 | } |
| 137 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 138 | static int bsg_io_schedule(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 139 | { |
| 140 | DEFINE_WAIT(wait); |
| 141 | int ret = 0; |
| 142 | |
| 143 | spin_lock_irq(&bd->lock); |
| 144 | |
| 145 | BUG_ON(bd->done_cmds > bd->queued_cmds); |
| 146 | |
| 147 | /* |
| 148 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no |
| 149 | * work to do", even though we return -ENOSPC after this same test |
| 150 | * during bsg_write() -- there, it means our buffer can't have more |
| 151 | * bsg_commands added to it, thus has no space left. |
| 152 | */ |
| 153 | if (bd->done_cmds == bd->queued_cmds) { |
| 154 | ret = -ENODATA; |
| 155 | goto unlock; |
| 156 | } |
| 157 | |
| 158 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
| 159 | ret = -EAGAIN; |
| 160 | goto unlock; |
| 161 | } |
| 162 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 163 | prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 164 | spin_unlock_irq(&bd->lock); |
| 165 | io_schedule(); |
| 166 | finish_wait(&bd->wq_done, &wait); |
| 167 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 168 | return ret; |
| 169 | unlock: |
| 170 | spin_unlock_irq(&bd->lock); |
| 171 | return ret; |
| 172 | } |
| 173 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 174 | static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 175 | struct sg_io_v4 *hdr, int has_write_perm) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 176 | { |
FUJITA Tomonori | 9f5de6b | 2008-04-30 13:16:21 +0900 | [diff] [blame] | 177 | if (hdr->request_len > BLK_MAX_CDB) { |
| 178 | rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); |
| 179 | if (!rq->cmd) |
| 180 | return -ENOMEM; |
| 181 | } |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 182 | |
| 183 | if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, |
| 184 | hdr->request_len)) |
| 185 | return -EFAULT; |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 186 | |
| 187 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { |
| 188 | if (blk_verify_command(rq->cmd, has_write_perm)) |
| 189 | return -EPERM; |
| 190 | } else if (!capable(CAP_SYS_RAWIO)) |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 191 | return -EPERM; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 192 | |
| 193 | /* |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 194 | * fill in request structure |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 195 | */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 196 | rq->cmd_len = hdr->request_len; |
| 197 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 198 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 199 | rq->timeout = (hdr->timeout * HZ) / 1000; |
| 200 | if (!rq->timeout) |
| 201 | rq->timeout = q->sg_timeout; |
| 202 | if (!rq->timeout) |
| 203 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | /* |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 209 | * Check if sg_io_v4 from user is allowed and valid |
| 210 | */ |
| 211 | static int |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 212 | bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 213 | { |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 214 | int ret = 0; |
| 215 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 216 | if (hdr->guard != 'Q') |
| 217 | return -EINVAL; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 218 | if (hdr->dout_xfer_len > (q->max_sectors << 9) || |
| 219 | hdr->din_xfer_len > (q->max_sectors << 9)) |
| 220 | return -EIO; |
| 221 | |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 222 | switch (hdr->protocol) { |
| 223 | case BSG_PROTOCOL_SCSI: |
| 224 | switch (hdr->subprotocol) { |
| 225 | case BSG_SUB_PROTOCOL_SCSI_CMD: |
| 226 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: |
| 227 | break; |
| 228 | default: |
| 229 | ret = -EINVAL; |
| 230 | } |
| 231 | break; |
| 232 | default: |
| 233 | ret = -EINVAL; |
| 234 | } |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 235 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 236 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 237 | return ret; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /* |
| 241 | * map sg_io_v4 to a request. |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 242 | */ |
| 243 | static struct request * |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 244 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 245 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 246 | struct request_queue *q = bd->queue; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 247 | struct request *rq, *next_rq = NULL; |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 248 | int ret, rw; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 249 | unsigned int dxfer_len; |
| 250 | void *dxferp = NULL; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 251 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 252 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
| 253 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, |
| 254 | hdr->din_xfer_len); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 255 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 256 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 257 | if (ret) |
| 258 | return ERR_PTR(ret); |
| 259 | |
| 260 | /* |
| 261 | * map scatter-gather elements seperately and string them to request |
| 262 | */ |
| 263 | rq = blk_get_request(q, rw, GFP_KERNEL); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 264 | if (!rq) |
| 265 | return ERR_PTR(-ENOMEM); |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 266 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM, |
| 267 | &bd->flags)); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 268 | if (ret) |
| 269 | goto out; |
| 270 | |
| 271 | if (rw == WRITE && hdr->din_xfer_len) { |
| 272 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { |
| 273 | ret = -EOPNOTSUPP; |
| 274 | goto out; |
| 275 | } |
| 276 | |
| 277 | next_rq = blk_get_request(q, READ, GFP_KERNEL); |
| 278 | if (!next_rq) { |
| 279 | ret = -ENOMEM; |
| 280 | goto out; |
| 281 | } |
| 282 | rq->next_rq = next_rq; |
James Bottomley | 40f6202 | 2008-01-25 20:05:55 -0600 | [diff] [blame] | 283 | next_rq->cmd_type = rq->cmd_type; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 284 | |
| 285 | dxferp = (void*)(unsigned long)hdr->din_xferp; |
| 286 | ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); |
| 287 | if (ret) |
| 288 | goto out; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 289 | } |
| 290 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 291 | if (hdr->dout_xfer_len) { |
| 292 | dxfer_len = hdr->dout_xfer_len; |
| 293 | dxferp = (void*)(unsigned long)hdr->dout_xferp; |
| 294 | } else if (hdr->din_xfer_len) { |
| 295 | dxfer_len = hdr->din_xfer_len; |
| 296 | dxferp = (void*)(unsigned long)hdr->din_xferp; |
| 297 | } else |
| 298 | dxfer_len = 0; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 299 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 300 | if (dxfer_len) { |
| 301 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 302 | if (ret) |
| 303 | goto out; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 304 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 305 | return rq; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 306 | out: |
FUJITA Tomonori | 9f5de6b | 2008-04-30 13:16:21 +0900 | [diff] [blame] | 307 | if (rq->cmd != rq->__cmd) |
| 308 | kfree(rq->cmd); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 309 | blk_put_request(rq); |
| 310 | if (next_rq) { |
| 311 | blk_rq_unmap_user(next_rq->bio); |
| 312 | blk_put_request(next_rq); |
| 313 | } |
| 314 | return ERR_PTR(ret); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | /* |
| 318 | * async completion call-back from the block layer, when scsi/ide/whatever |
| 319 | * calls end_that_request_last() on a request |
| 320 | */ |
| 321 | static void bsg_rq_end_io(struct request *rq, int uptodate) |
| 322 | { |
| 323 | struct bsg_command *bc = rq->end_io_data; |
| 324 | struct bsg_device *bd = bc->bd; |
| 325 | unsigned long flags; |
| 326 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 327 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
| 328 | bd->name, rq, bc, bc->bio, uptodate); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 329 | |
| 330 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); |
| 331 | |
| 332 | spin_lock_irqsave(&bd->lock, flags); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 333 | list_move_tail(&bc->list, &bd->done_list); |
| 334 | bd->done_cmds++; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 335 | spin_unlock_irqrestore(&bd->lock, flags); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 336 | |
| 337 | wake_up(&bd->wq_done); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | /* |
| 341 | * do final setup of a 'bc' and submit the matching 'rq' to the block |
| 342 | * layer for io |
| 343 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 344 | static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 345 | struct bsg_command *bc, struct request *rq) |
| 346 | { |
| 347 | rq->sense = bc->sense; |
| 348 | rq->sense_len = 0; |
| 349 | |
| 350 | /* |
| 351 | * add bc command to busy queue and submit rq for io |
| 352 | */ |
| 353 | bc->rq = rq; |
| 354 | bc->bio = rq->bio; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 355 | if (rq->next_rq) |
| 356 | bc->bidi_bio = rq->next_rq->bio; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 357 | bc->hdr.duration = jiffies; |
| 358 | spin_lock_irq(&bd->lock); |
| 359 | list_add_tail(&bc->list, &bd->busy_list); |
| 360 | spin_unlock_irq(&bd->lock); |
| 361 | |
| 362 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); |
| 363 | |
| 364 | rq->end_io_data = bc; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 365 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 366 | } |
| 367 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 368 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 369 | { |
| 370 | struct bsg_command *bc = NULL; |
| 371 | |
| 372 | spin_lock_irq(&bd->lock); |
| 373 | if (bd->done_cmds) { |
FUJITA Tomonori | 43ac9e6 | 2008-03-31 10:03:40 +0900 | [diff] [blame] | 374 | bc = list_first_entry(&bd->done_list, struct bsg_command, list); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 375 | list_del(&bc->list); |
| 376 | bd->done_cmds--; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 377 | } |
| 378 | spin_unlock_irq(&bd->lock); |
| 379 | |
| 380 | return bc; |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Get a finished command from the done list |
| 385 | */ |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 386 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 387 | { |
| 388 | struct bsg_command *bc; |
| 389 | int ret; |
| 390 | |
| 391 | do { |
| 392 | bc = bsg_next_done_cmd(bd); |
| 393 | if (bc) |
| 394 | break; |
| 395 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 396 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
| 397 | bc = ERR_PTR(-EAGAIN); |
| 398 | break; |
| 399 | } |
| 400 | |
| 401 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 402 | if (ret) { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 403 | bc = ERR_PTR(-ERESTARTSYS); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 404 | break; |
| 405 | } |
| 406 | } while (1); |
| 407 | |
| 408 | dprintk("%s: returning done %p\n", bd->name, bc); |
| 409 | |
| 410 | return bc; |
| 411 | } |
| 412 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 413 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 414 | struct bio *bio, struct bio *bidi_bio) |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 415 | { |
| 416 | int ret = 0; |
| 417 | |
| 418 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); |
| 419 | /* |
| 420 | * fill in all the output members |
| 421 | */ |
| 422 | hdr->device_status = status_byte(rq->errors); |
| 423 | hdr->transport_status = host_byte(rq->errors); |
| 424 | hdr->driver_status = driver_byte(rq->errors); |
| 425 | hdr->info = 0; |
| 426 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) |
| 427 | hdr->info |= SG_INFO_CHECK; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 428 | hdr->response_len = 0; |
| 429 | |
| 430 | if (rq->sense_len && hdr->response) { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 431 | int len = min_t(unsigned int, hdr->max_response_len, |
| 432 | rq->sense_len); |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 433 | |
| 434 | ret = copy_to_user((void*)(unsigned long)hdr->response, |
| 435 | rq->sense, len); |
| 436 | if (!ret) |
| 437 | hdr->response_len = len; |
| 438 | else |
| 439 | ret = -EFAULT; |
| 440 | } |
| 441 | |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 442 | if (rq->next_rq) { |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 443 | hdr->dout_resid = rq->data_len; |
| 444 | hdr->din_resid = rq->next_rq->data_len; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 445 | blk_rq_unmap_user(bidi_bio); |
| 446 | blk_put_request(rq->next_rq); |
FUJITA Tomonori | 0c6a89b | 2007-07-29 23:00:46 +0900 | [diff] [blame] | 447 | } else if (rq_data_dir(rq) == READ) |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 448 | hdr->din_resid = rq->data_len; |
FUJITA Tomonori | 0c6a89b | 2007-07-29 23:00:46 +0900 | [diff] [blame] | 449 | else |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 450 | hdr->dout_resid = rq->data_len; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 451 | |
James Bottomley | 2d507a0 | 2007-12-29 10:59:53 -0600 | [diff] [blame] | 452 | /* |
| 453 | * If the request generated a negative error number, return it |
| 454 | * (providing we aren't already returning an error); if it's |
| 455 | * just a protocol response (i.e. non negative), that gets |
| 456 | * processed above. |
| 457 | */ |
| 458 | if (!ret && rq->errors < 0) |
| 459 | ret = rq->errors; |
| 460 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 461 | blk_rq_unmap_user(bio); |
FUJITA Tomonori | 9f5de6b | 2008-04-30 13:16:21 +0900 | [diff] [blame] | 462 | if (rq->cmd != rq->__cmd) |
| 463 | kfree(rq->cmd); |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 464 | blk_put_request(rq); |
| 465 | |
| 466 | return ret; |
| 467 | } |
| 468 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 469 | static int bsg_complete_all_commands(struct bsg_device *bd) |
| 470 | { |
| 471 | struct bsg_command *bc; |
| 472 | int ret, tret; |
| 473 | |
| 474 | dprintk("%s: entered\n", bd->name); |
| 475 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 476 | /* |
| 477 | * wait for all commands to complete |
| 478 | */ |
| 479 | ret = 0; |
| 480 | do { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 481 | ret = bsg_io_schedule(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 482 | /* |
| 483 | * look for -ENODATA specifically -- we'll sometimes get |
| 484 | * -ERESTARTSYS when we've taken a signal, but we can't |
| 485 | * return until we're done freeing the queue, so ignore |
| 486 | * it. The signal will get handled when we're done freeing |
| 487 | * the bsg_device. |
| 488 | */ |
| 489 | } while (ret != -ENODATA); |
| 490 | |
| 491 | /* |
| 492 | * discard done commands |
| 493 | */ |
| 494 | ret = 0; |
| 495 | do { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 496 | spin_lock_irq(&bd->lock); |
| 497 | if (!bd->queued_cmds) { |
| 498 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 499 | break; |
| 500 | } |
FUJITA Tomonori | efba1a3 | 2007-06-07 13:24:06 +0200 | [diff] [blame] | 501 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 502 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 503 | bc = bsg_get_done_cmd(bd); |
| 504 | if (IS_ERR(bc)) |
| 505 | break; |
| 506 | |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 507 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
| 508 | bc->bidi_bio); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 509 | if (!ret) |
| 510 | ret = tret; |
| 511 | |
| 512 | bsg_free_command(bc); |
| 513 | } while (1); |
| 514 | |
| 515 | return ret; |
| 516 | } |
| 517 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 518 | static int |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 519 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
| 520 | const struct iovec *iov, ssize_t *bytes_read) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 521 | { |
| 522 | struct bsg_command *bc; |
| 523 | int nr_commands, ret; |
| 524 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 525 | if (count % sizeof(struct sg_io_v4)) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 526 | return -EINVAL; |
| 527 | |
| 528 | ret = 0; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 529 | nr_commands = count / sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 530 | while (nr_commands) { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 531 | bc = bsg_get_done_cmd(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 532 | if (IS_ERR(bc)) { |
| 533 | ret = PTR_ERR(bc); |
| 534 | break; |
| 535 | } |
| 536 | |
| 537 | /* |
| 538 | * this is the only case where we need to copy data back |
| 539 | * after completing the request. so do that here, |
| 540 | * bsg_complete_work() cannot do that for us |
| 541 | */ |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 542 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
| 543 | bc->bidi_bio); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 544 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 545 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 546 | ret = -EFAULT; |
| 547 | |
| 548 | bsg_free_command(bc); |
| 549 | |
| 550 | if (ret) |
| 551 | break; |
| 552 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 553 | buf += sizeof(struct sg_io_v4); |
| 554 | *bytes_read += sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 555 | nr_commands--; |
| 556 | } |
| 557 | |
| 558 | return ret; |
| 559 | } |
| 560 | |
| 561 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) |
| 562 | { |
| 563 | if (file->f_flags & O_NONBLOCK) |
| 564 | clear_bit(BSG_F_BLOCK, &bd->flags); |
| 565 | else |
| 566 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 567 | } |
| 568 | |
| 569 | static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file) |
| 570 | { |
| 571 | if (file->f_mode & FMODE_WRITE) |
| 572 | set_bit(BSG_F_WRITE_PERM, &bd->flags); |
| 573 | else |
| 574 | clear_bit(BSG_F_WRITE_PERM, &bd->flags); |
| 575 | } |
| 576 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 577 | /* |
| 578 | * Check if the error is a "real" error that we should return. |
| 579 | */ |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 580 | static inline int err_block_err(int ret) |
| 581 | { |
| 582 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) |
| 583 | return 1; |
| 584 | |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | static ssize_t |
| 589 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 590 | { |
| 591 | struct bsg_device *bd = file->private_data; |
| 592 | int ret; |
| 593 | ssize_t bytes_read; |
| 594 | |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 595 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 596 | |
| 597 | bsg_set_block(bd, file); |
| 598 | bytes_read = 0; |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 599 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 600 | *ppos = bytes_read; |
| 601 | |
| 602 | if (!bytes_read || (bytes_read && err_block_err(ret))) |
| 603 | bytes_read = ret; |
| 604 | |
| 605 | return bytes_read; |
| 606 | } |
| 607 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 608 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
| 609 | size_t count, ssize_t *bytes_written) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 610 | { |
| 611 | struct bsg_command *bc; |
| 612 | struct request *rq; |
| 613 | int ret, nr_commands; |
| 614 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 615 | if (count % sizeof(struct sg_io_v4)) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 616 | return -EINVAL; |
| 617 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 618 | nr_commands = count / sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 619 | rq = NULL; |
| 620 | bc = NULL; |
| 621 | ret = 0; |
| 622 | while (nr_commands) { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 623 | struct request_queue *q = bd->queue; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 624 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 625 | bc = bsg_alloc_command(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 626 | if (IS_ERR(bc)) { |
| 627 | ret = PTR_ERR(bc); |
| 628 | bc = NULL; |
| 629 | break; |
| 630 | } |
| 631 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 632 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
| 633 | ret = -EFAULT; |
| 634 | break; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * get a request, fill in the blanks, and add to request queue |
| 639 | */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 640 | rq = bsg_map_hdr(bd, &bc->hdr); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 641 | if (IS_ERR(rq)) { |
| 642 | ret = PTR_ERR(rq); |
| 643 | rq = NULL; |
| 644 | break; |
| 645 | } |
| 646 | |
| 647 | bsg_add_command(bd, q, bc, rq); |
| 648 | bc = NULL; |
| 649 | rq = NULL; |
| 650 | nr_commands--; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 651 | buf += sizeof(struct sg_io_v4); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 652 | *bytes_written += sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 653 | } |
| 654 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 655 | if (bc) |
| 656 | bsg_free_command(bc); |
| 657 | |
| 658 | return ret; |
| 659 | } |
| 660 | |
| 661 | static ssize_t |
| 662 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
| 663 | { |
| 664 | struct bsg_device *bd = file->private_data; |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 665 | ssize_t bytes_written; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 666 | int ret; |
| 667 | |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 668 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 669 | |
| 670 | bsg_set_block(bd, file); |
| 671 | bsg_set_write_perm(bd, file); |
| 672 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 673 | bytes_written = 0; |
| 674 | ret = __bsg_write(bd, buf, count, &bytes_written); |
| 675 | *ppos = bytes_written; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 676 | |
| 677 | /* |
| 678 | * return bytes written on non-fatal errors |
| 679 | */ |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 680 | if (!bytes_written || (bytes_written && err_block_err(ret))) |
| 681 | bytes_written = ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 682 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 683 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
| 684 | return bytes_written; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 685 | } |
| 686 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 687 | static struct bsg_device *bsg_alloc_device(void) |
| 688 | { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 689 | struct bsg_device *bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 690 | |
| 691 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); |
| 692 | if (unlikely(!bd)) |
| 693 | return NULL; |
| 694 | |
| 695 | spin_lock_init(&bd->lock); |
| 696 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 697 | bd->max_queue = BSG_DEFAULT_CMDS; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 698 | |
| 699 | INIT_LIST_HEAD(&bd->busy_list); |
| 700 | INIT_LIST_HEAD(&bd->done_list); |
| 701 | INIT_HLIST_NODE(&bd->dev_list); |
| 702 | |
| 703 | init_waitqueue_head(&bd->wq_free); |
| 704 | init_waitqueue_head(&bd->wq_done); |
| 705 | return bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 706 | } |
| 707 | |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 708 | static void bsg_kref_release_function(struct kref *kref) |
| 709 | { |
| 710 | struct bsg_class_device *bcd = |
| 711 | container_of(kref, struct bsg_class_device, ref); |
| 712 | |
| 713 | if (bcd->release) |
| 714 | bcd->release(bcd->parent); |
| 715 | |
| 716 | put_device(bcd->parent); |
| 717 | } |
| 718 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 719 | static int bsg_put_device(struct bsg_device *bd) |
| 720 | { |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 721 | int ret = 0, do_free; |
| 722 | struct request_queue *q = bd->queue; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 723 | |
| 724 | mutex_lock(&bsg_mutex); |
| 725 | |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 726 | do_free = atomic_dec_and_test(&bd->ref_count); |
| 727 | if (!do_free) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 728 | goto out; |
| 729 | |
| 730 | dprintk("%s: tearing down\n", bd->name); |
| 731 | |
| 732 | /* |
| 733 | * close can always block |
| 734 | */ |
| 735 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 736 | |
| 737 | /* |
| 738 | * correct error detection baddies here again. it's the responsibility |
| 739 | * of the app to properly reap commands before close() if it wants |
| 740 | * fool-proof error detection |
| 741 | */ |
| 742 | ret = bsg_complete_all_commands(bd); |
| 743 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 744 | hlist_del(&bd->dev_list); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 745 | kfree(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 746 | out: |
| 747 | mutex_unlock(&bsg_mutex); |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 748 | kref_put(&q->bsg_dev.ref, bsg_kref_release_function); |
| 749 | if (do_free) |
| 750 | blk_put_queue(q); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 751 | return ret; |
| 752 | } |
| 753 | |
| 754 | static struct bsg_device *bsg_add_device(struct inode *inode, |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 755 | struct request_queue *rq, |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 756 | struct file *file) |
| 757 | { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 758 | struct bsg_device *bd; |
FUJITA Tomonori | c3ff1b9 | 2008-03-31 10:03:39 +0900 | [diff] [blame] | 759 | int ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 760 | #ifdef BSG_DEBUG |
| 761 | unsigned char buf[32]; |
| 762 | #endif |
FUJITA Tomonori | c3ff1b9 | 2008-03-31 10:03:39 +0900 | [diff] [blame] | 763 | ret = blk_get_queue(rq); |
| 764 | if (ret) |
| 765 | return ERR_PTR(-ENXIO); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 766 | |
| 767 | bd = bsg_alloc_device(); |
FUJITA Tomonori | c3ff1b9 | 2008-03-31 10:03:39 +0900 | [diff] [blame] | 768 | if (!bd) { |
| 769 | blk_put_queue(rq); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 770 | return ERR_PTR(-ENOMEM); |
FUJITA Tomonori | c3ff1b9 | 2008-03-31 10:03:39 +0900 | [diff] [blame] | 771 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 772 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 773 | bd->queue = rq; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 774 | bsg_set_block(bd, file); |
| 775 | |
| 776 | atomic_set(&bd->ref_count, 1); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 777 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | 842ea77 | 2008-03-31 10:03:41 +0900 | [diff] [blame] | 778 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 779 | |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 780 | strncpy(bd->name, rq->bsg_dev.class_dev->bus_id, sizeof(bd->name) - 1); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 781 | dprintk("bound to <%s>, max queue %d\n", |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 782 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 783 | |
| 784 | mutex_unlock(&bsg_mutex); |
| 785 | return bd; |
| 786 | } |
| 787 | |
FUJITA Tomonori | 842ea77 | 2008-03-31 10:03:41 +0900 | [diff] [blame] | 788 | static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 789 | { |
FUJITA Tomonori | 43ac9e6 | 2008-03-31 10:03:40 +0900 | [diff] [blame] | 790 | struct bsg_device *bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 791 | struct hlist_node *entry; |
| 792 | |
| 793 | mutex_lock(&bsg_mutex); |
| 794 | |
FUJITA Tomonori | 43ac9e6 | 2008-03-31 10:03:40 +0900 | [diff] [blame] | 795 | hlist_for_each_entry(bd, entry, bsg_dev_idx_hash(minor), dev_list) { |
FUJITA Tomonori | 842ea77 | 2008-03-31 10:03:41 +0900 | [diff] [blame] | 796 | if (bd->queue == q) { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 797 | atomic_inc(&bd->ref_count); |
FUJITA Tomonori | 43ac9e6 | 2008-03-31 10:03:40 +0900 | [diff] [blame] | 798 | goto found; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 799 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 800 | } |
FUJITA Tomonori | 43ac9e6 | 2008-03-31 10:03:40 +0900 | [diff] [blame] | 801 | bd = NULL; |
| 802 | found: |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 803 | mutex_unlock(&bsg_mutex); |
| 804 | return bd; |
| 805 | } |
| 806 | |
| 807 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) |
| 808 | { |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 809 | struct bsg_device *bd; |
| 810 | struct bsg_class_device *bcd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 811 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 812 | /* |
| 813 | * find the class device |
| 814 | */ |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 815 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 816 | bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
FUJITA Tomonori | d45ac4f | 2008-03-31 10:03:38 +0900 | [diff] [blame] | 817 | if (bcd) |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 818 | kref_get(&bcd->ref); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 819 | mutex_unlock(&bsg_mutex); |
| 820 | |
| 821 | if (!bcd) |
| 822 | return ERR_PTR(-ENODEV); |
| 823 | |
FUJITA Tomonori | 842ea77 | 2008-03-31 10:03:41 +0900 | [diff] [blame] | 824 | bd = __bsg_get_device(iminor(inode), bcd->queue); |
FUJITA Tomonori | d45ac4f | 2008-03-31 10:03:38 +0900 | [diff] [blame] | 825 | if (bd) |
| 826 | return bd; |
| 827 | |
| 828 | bd = bsg_add_device(inode, bcd->queue, file); |
| 829 | if (IS_ERR(bd)) |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 830 | kref_put(&bcd->ref, bsg_kref_release_function); |
FUJITA Tomonori | d45ac4f | 2008-03-31 10:03:38 +0900 | [diff] [blame] | 831 | |
| 832 | return bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 833 | } |
| 834 | |
| 835 | static int bsg_open(struct inode *inode, struct file *file) |
| 836 | { |
| 837 | struct bsg_device *bd = bsg_get_device(inode, file); |
| 838 | |
| 839 | if (IS_ERR(bd)) |
| 840 | return PTR_ERR(bd); |
| 841 | |
| 842 | file->private_data = bd; |
| 843 | return 0; |
| 844 | } |
| 845 | |
| 846 | static int bsg_release(struct inode *inode, struct file *file) |
| 847 | { |
| 848 | struct bsg_device *bd = file->private_data; |
| 849 | |
| 850 | file->private_data = NULL; |
| 851 | return bsg_put_device(bd); |
| 852 | } |
| 853 | |
| 854 | static unsigned int bsg_poll(struct file *file, poll_table *wait) |
| 855 | { |
| 856 | struct bsg_device *bd = file->private_data; |
| 857 | unsigned int mask = 0; |
| 858 | |
| 859 | poll_wait(file, &bd->wq_done, wait); |
| 860 | poll_wait(file, &bd->wq_free, wait); |
| 861 | |
| 862 | spin_lock_irq(&bd->lock); |
| 863 | if (!list_empty(&bd->done_list)) |
| 864 | mask |= POLLIN | POLLRDNORM; |
| 865 | if (bd->queued_cmds >= bd->max_queue) |
| 866 | mask |= POLLOUT; |
| 867 | spin_unlock_irq(&bd->lock); |
| 868 | |
| 869 | return mask; |
| 870 | } |
| 871 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 872 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 873 | { |
| 874 | struct bsg_device *bd = file->private_data; |
| 875 | int __user *uarg = (int __user *) arg; |
James Bottomley | 2d507a0 | 2007-12-29 10:59:53 -0600 | [diff] [blame] | 876 | int ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 877 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 878 | switch (cmd) { |
| 879 | /* |
| 880 | * our own ioctls |
| 881 | */ |
| 882 | case SG_GET_COMMAND_Q: |
| 883 | return put_user(bd->max_queue, uarg); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 884 | case SG_SET_COMMAND_Q: { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 885 | int queue; |
| 886 | |
| 887 | if (get_user(queue, uarg)) |
| 888 | return -EFAULT; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 889 | if (queue < 1) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 890 | return -EINVAL; |
| 891 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 892 | spin_lock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 893 | bd->max_queue = queue; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 894 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 895 | return 0; |
| 896 | } |
| 897 | |
| 898 | /* |
| 899 | * SCSI/sg ioctls |
| 900 | */ |
| 901 | case SG_GET_VERSION_NUM: |
| 902 | case SCSI_IOCTL_GET_IDLUN: |
| 903 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 904 | case SG_SET_TIMEOUT: |
| 905 | case SG_GET_TIMEOUT: |
| 906 | case SG_GET_RESERVED_SIZE: |
| 907 | case SG_SET_RESERVED_SIZE: |
| 908 | case SG_EMULATED_HOST: |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 909 | case SCSI_IOCTL_SEND_COMMAND: { |
| 910 | void __user *uarg = (void __user *) arg; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 911 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 912 | } |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 913 | case SG_IO: { |
| 914 | struct request *rq; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 915 | struct bio *bio, *bidi_bio = NULL; |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 916 | struct sg_io_v4 hdr; |
| 917 | |
| 918 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) |
| 919 | return -EFAULT; |
| 920 | |
| 921 | rq = bsg_map_hdr(bd, &hdr); |
| 922 | if (IS_ERR(rq)) |
| 923 | return PTR_ERR(rq); |
| 924 | |
| 925 | bio = rq->bio; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 926 | if (rq->next_rq) |
| 927 | bidi_bio = rq->next_rq->bio; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 928 | blk_execute_rq(bd->queue, NULL, rq, 0); |
James Bottomley | 2d507a0 | 2007-12-29 10:59:53 -0600 | [diff] [blame] | 929 | ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 930 | |
| 931 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) |
| 932 | return -EFAULT; |
Jens Axboe | b711afa | 2006-12-20 11:25:23 +0100 | [diff] [blame] | 933 | |
James Bottomley | 2d507a0 | 2007-12-29 10:59:53 -0600 | [diff] [blame] | 934 | return ret; |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 935 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 936 | /* |
| 937 | * block device ioctls |
| 938 | */ |
| 939 | default: |
| 940 | #if 0 |
| 941 | return ioctl_by_bdev(bd->bdev, cmd, arg); |
| 942 | #else |
| 943 | return -ENOTTY; |
| 944 | #endif |
| 945 | } |
| 946 | } |
| 947 | |
Arjan van de Ven | 7344be0 | 2007-10-15 11:01:53 +0200 | [diff] [blame] | 948 | static const struct file_operations bsg_fops = { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 949 | .read = bsg_read, |
| 950 | .write = bsg_write, |
| 951 | .poll = bsg_poll, |
| 952 | .open = bsg_open, |
| 953 | .release = bsg_release, |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 954 | .unlocked_ioctl = bsg_ioctl, |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 955 | .owner = THIS_MODULE, |
| 956 | }; |
| 957 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 958 | void bsg_unregister_queue(struct request_queue *q) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 959 | { |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 960 | struct bsg_class_device *bcd = &q->bsg_dev; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 961 | |
FUJITA Tomonori | df46882 | 2007-07-21 13:23:25 +0900 | [diff] [blame] | 962 | if (!bcd->class_dev) |
| 963 | return; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 964 | |
| 965 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 966 | idr_remove(&bsg_minor_idr, bcd->minor); |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 967 | sysfs_remove_link(&q->kobj, "bsg"); |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 968 | device_unregister(bcd->class_dev); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 969 | bcd->class_dev = NULL; |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 970 | kref_put(&bcd->ref, bsg_kref_release_function); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 971 | mutex_unlock(&bsg_mutex); |
| 972 | } |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 973 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 974 | |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 975 | int bsg_register_queue(struct request_queue *q, struct device *parent, |
| 976 | const char *name, void (*release)(struct device *)) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 977 | { |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 978 | struct bsg_class_device *bcd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 979 | dev_t dev; |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 980 | int ret, minor; |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 981 | struct device *class_dev = NULL; |
James Bottomley | 39dca55 | 2007-07-20 18:22:17 -0500 | [diff] [blame] | 982 | const char *devname; |
| 983 | |
| 984 | if (name) |
| 985 | devname = name; |
| 986 | else |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 987 | devname = parent->bus_id; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 988 | |
| 989 | /* |
| 990 | * we need a proper transport to send commands, not a stacked device |
| 991 | */ |
| 992 | if (!q->request_fn) |
| 993 | return 0; |
| 994 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 995 | bcd = &q->bsg_dev; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 996 | memset(bcd, 0, sizeof(*bcd)); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 997 | |
| 998 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 999 | |
| 1000 | ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL); |
| 1001 | if (!ret) { |
| 1002 | ret = -ENOMEM; |
| 1003 | goto unlock; |
| 1004 | } |
| 1005 | |
| 1006 | ret = idr_get_new(&bsg_minor_idr, bcd, &minor); |
| 1007 | if (ret < 0) |
| 1008 | goto unlock; |
| 1009 | |
| 1010 | if (minor >= BSG_MAX_DEVS) { |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1011 | printk(KERN_ERR "bsg: too many bsg devices\n"); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 1012 | ret = -EINVAL; |
| 1013 | goto remove_idr; |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1014 | } |
| 1015 | |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 1016 | bcd->minor = minor; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 1017 | bcd->queue = q; |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 1018 | bcd->parent = get_device(parent); |
| 1019 | bcd->release = release; |
| 1020 | kref_init(&bcd->ref); |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1021 | dev = MKDEV(bsg_major, bcd->minor); |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 1022 | class_dev = device_create(bsg_class, parent, dev, "%s", devname); |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1023 | if (IS_ERR(class_dev)) { |
| 1024 | ret = PTR_ERR(class_dev); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 1025 | goto put_dev; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1026 | } |
| 1027 | bcd->class_dev = class_dev; |
| 1028 | |
Linus Torvalds | abce891 | 2007-07-16 11:18:23 -0700 | [diff] [blame] | 1029 | if (q->kobj.sd) { |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1030 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
| 1031 | if (ret) |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 1032 | goto unregister_class_dev; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1033 | } |
| 1034 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1035 | mutex_unlock(&bsg_mutex); |
| 1036 | return 0; |
James Bottomley | 6826ee4 | 2007-07-20 16:50:10 -0500 | [diff] [blame] | 1037 | |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 1038 | unregister_class_dev: |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 1039 | device_unregister(class_dev); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 1040 | put_dev: |
FUJITA Tomonori | 97f46ae | 2008-04-19 00:43:14 +0900 | [diff] [blame] | 1041 | put_device(parent); |
FUJITA Tomonori | 598443a | 2007-07-23 09:33:26 +0900 | [diff] [blame] | 1042 | remove_idr: |
| 1043 | idr_remove(&bsg_minor_idr, minor); |
| 1044 | unlock: |
Jens Axboe | 264a047 | 2007-01-23 16:30:17 +0100 | [diff] [blame] | 1045 | mutex_unlock(&bsg_mutex); |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1046 | return ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1047 | } |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 1048 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1049 | |
Greg Kroah-Hartman | 7e7654a | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 1050 | static struct cdev bsg_cdev; |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1051 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1052 | static int __init bsg_init(void) |
| 1053 | { |
| 1054 | int ret, i; |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1055 | dev_t devid; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1056 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1057 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1058 | sizeof(struct bsg_command), 0, 0, NULL); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1059 | if (!bsg_cmd_cachep) { |
| 1060 | printk(KERN_ERR "bsg: failed creating slab cache\n"); |
| 1061 | return -ENOMEM; |
| 1062 | } |
| 1063 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 1064 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1065 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
| 1066 | |
| 1067 | bsg_class = class_create(THIS_MODULE, "bsg"); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1068 | if (IS_ERR(bsg_class)) { |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame] | 1069 | ret = PTR_ERR(bsg_class); |
| 1070 | goto destroy_kmemcache; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1071 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1072 | |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1073 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame] | 1074 | if (ret) |
| 1075 | goto destroy_bsg_class; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1076 | |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1077 | bsg_major = MAJOR(devid); |
| 1078 | |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1079 | cdev_init(&bsg_cdev, &bsg_fops); |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1080 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame] | 1081 | if (ret) |
| 1082 | goto unregister_chrdev; |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1083 | |
Jens Axboe | 5d3a8cd | 2007-07-17 15:10:09 +0200 | [diff] [blame] | 1084 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
FUJITA Tomonori | 0ed081c | 2007-07-17 12:21:35 +0200 | [diff] [blame] | 1085 | " loaded (major %d)\n", bsg_major); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1086 | return 0; |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame] | 1087 | unregister_chrdev: |
| 1088 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
| 1089 | destroy_bsg_class: |
| 1090 | class_destroy(bsg_class); |
| 1091 | destroy_kmemcache: |
| 1092 | kmem_cache_destroy(bsg_cmd_cachep); |
| 1093 | return ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1094 | } |
| 1095 | |
| 1096 | MODULE_AUTHOR("Jens Axboe"); |
FUJITA Tomonori | 0ed081c | 2007-07-17 12:21:35 +0200 | [diff] [blame] | 1097 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1098 | MODULE_LICENSE("GPL"); |
| 1099 | |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1100 | device_initcall(bsg_init); |