Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1 | /* |
| 2 | * bsg.c - block layer implementation of the sg v3 interface |
| 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 | */ |
| 12 | /* |
| 13 | * TODO |
| 14 | * - Should this get merged, block/scsi_ioctl.c will be migrated into |
| 15 | * this file. To keep maintenance down, it's easier to have them |
| 16 | * seperated right now. |
| 17 | * |
| 18 | */ |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/file.h> |
| 22 | #include <linux/blkdev.h> |
| 23 | #include <linux/poll.h> |
| 24 | #include <linux/cdev.h> |
| 25 | #include <linux/percpu.h> |
| 26 | #include <linux/uio.h> |
| 27 | #include <linux/bsg.h> |
| 28 | |
| 29 | #include <scsi/scsi.h> |
| 30 | #include <scsi/scsi_ioctl.h> |
| 31 | #include <scsi/scsi_cmnd.h> |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 32 | #include <scsi/scsi_device.h> |
| 33 | #include <scsi/scsi_driver.h> |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 34 | #include <scsi/sg.h> |
| 35 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 36 | const static char bsg_version[] = "block layer sg (bsg) 0.4"; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 37 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 38 | struct bsg_device { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 39 | request_queue_t *queue; |
| 40 | spinlock_t lock; |
| 41 | struct list_head busy_list; |
| 42 | struct list_head done_list; |
| 43 | struct hlist_node dev_list; |
| 44 | atomic_t ref_count; |
| 45 | int minor; |
| 46 | int queued_cmds; |
| 47 | int done_cmds; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 48 | wait_queue_head_t wq_done; |
| 49 | wait_queue_head_t wq_free; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 50 | char name[BUS_ID_SIZE]; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 51 | int max_queue; |
| 52 | unsigned long flags; |
| 53 | }; |
| 54 | |
| 55 | enum { |
| 56 | BSG_F_BLOCK = 1, |
| 57 | BSG_F_WRITE_PERM = 2, |
| 58 | }; |
| 59 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 60 | #define BSG_DEFAULT_CMDS 64 |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 61 | #define BSG_MAX_DEVS 32768 |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 62 | |
| 63 | #undef BSG_DEBUG |
| 64 | |
| 65 | #ifdef BSG_DEBUG |
| 66 | #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ##args) |
| 67 | #else |
| 68 | #define dprintk(fmt, args...) |
| 69 | #endif |
| 70 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 71 | static DEFINE_MUTEX(bsg_mutex); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 72 | static int bsg_device_nr, bsg_minor_idx; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 73 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 74 | #define BSG_LIST_ARRAY_SIZE 8 |
| 75 | #define bsg_list_idx(minor) ((minor) & (BSG_LIST_ARRAY_SIZE - 1)) |
| 76 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 77 | |
| 78 | static struct class *bsg_class; |
| 79 | static LIST_HEAD(bsg_class_list); |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 80 | static int bsg_major; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 81 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 82 | static struct kmem_cache *bsg_cmd_cachep; |
| 83 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 84 | /* |
| 85 | * our internal command type |
| 86 | */ |
| 87 | struct bsg_command { |
| 88 | struct bsg_device *bd; |
| 89 | struct list_head list; |
| 90 | struct request *rq; |
| 91 | struct bio *bio; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 92 | struct bio *bidi_bio; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 93 | int err; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 94 | struct sg_io_v4 hdr; |
| 95 | struct sg_io_v4 __user *uhdr; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 96 | char sense[SCSI_SENSE_BUFFERSIZE]; |
| 97 | }; |
| 98 | |
| 99 | static void bsg_free_command(struct bsg_command *bc) |
| 100 | { |
| 101 | struct bsg_device *bd = bc->bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 102 | unsigned long flags; |
| 103 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 104 | kmem_cache_free(bsg_cmd_cachep, bc); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 105 | |
| 106 | spin_lock_irqsave(&bd->lock, flags); |
| 107 | bd->queued_cmds--; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 108 | spin_unlock_irqrestore(&bd->lock, flags); |
| 109 | |
| 110 | wake_up(&bd->wq_free); |
| 111 | } |
| 112 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 113 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 114 | { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 115 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 116 | |
| 117 | spin_lock_irq(&bd->lock); |
| 118 | |
| 119 | if (bd->queued_cmds >= bd->max_queue) |
| 120 | goto out; |
| 121 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 122 | bd->queued_cmds++; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 123 | spin_unlock_irq(&bd->lock); |
| 124 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 125 | bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 126 | if (unlikely(!bc)) { |
| 127 | spin_lock_irq(&bd->lock); |
FUJITA Tomonori | 7e75d73 | 2007-01-24 09:05:54 +0100 | [diff] [blame] | 128 | bd->queued_cmds--; |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 129 | bc = ERR_PTR(-ENOMEM); |
FUJITA Tomonori | 7e75d73 | 2007-01-24 09:05:54 +0100 | [diff] [blame] | 130 | goto out; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 131 | } |
| 132 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 133 | bc->bd = bd; |
| 134 | INIT_LIST_HEAD(&bc->list); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 135 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 136 | return bc; |
| 137 | out: |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 138 | spin_unlock_irq(&bd->lock); |
| 139 | return bc; |
| 140 | } |
| 141 | |
| 142 | static inline void |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 143 | bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc) |
| 144 | { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 145 | } |
| 146 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 147 | static int bsg_io_schedule(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 148 | { |
| 149 | DEFINE_WAIT(wait); |
| 150 | int ret = 0; |
| 151 | |
| 152 | spin_lock_irq(&bd->lock); |
| 153 | |
| 154 | BUG_ON(bd->done_cmds > bd->queued_cmds); |
| 155 | |
| 156 | /* |
| 157 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no |
| 158 | * work to do", even though we return -ENOSPC after this same test |
| 159 | * during bsg_write() -- there, it means our buffer can't have more |
| 160 | * bsg_commands added to it, thus has no space left. |
| 161 | */ |
| 162 | if (bd->done_cmds == bd->queued_cmds) { |
| 163 | ret = -ENODATA; |
| 164 | goto unlock; |
| 165 | } |
| 166 | |
| 167 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
| 168 | ret = -EAGAIN; |
| 169 | goto unlock; |
| 170 | } |
| 171 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 172 | prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 173 | spin_unlock_irq(&bd->lock); |
| 174 | io_schedule(); |
| 175 | finish_wait(&bd->wq_done, &wait); |
| 176 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 177 | return ret; |
| 178 | unlock: |
| 179 | spin_unlock_irq(&bd->lock); |
| 180 | return ret; |
| 181 | } |
| 182 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 183 | static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq, |
| 184 | struct sg_io_v4 *hdr, int has_write_perm) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 185 | { |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 186 | memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */ |
| 187 | |
| 188 | if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, |
| 189 | hdr->request_len)) |
| 190 | return -EFAULT; |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 191 | |
| 192 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { |
| 193 | if (blk_verify_command(rq->cmd, has_write_perm)) |
| 194 | return -EPERM; |
| 195 | } else if (!capable(CAP_SYS_RAWIO)) |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 196 | return -EPERM; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 197 | |
| 198 | /* |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 199 | * fill in request structure |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 200 | */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 201 | rq->cmd_len = hdr->request_len; |
| 202 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 203 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 204 | rq->timeout = (hdr->timeout * HZ) / 1000; |
| 205 | if (!rq->timeout) |
| 206 | rq->timeout = q->sg_timeout; |
| 207 | if (!rq->timeout) |
| 208 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | /* |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 214 | * Check if sg_io_v4 from user is allowed and valid |
| 215 | */ |
| 216 | static int |
| 217 | bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw) |
| 218 | { |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 219 | int ret = 0; |
| 220 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 221 | if (hdr->guard != 'Q') |
| 222 | return -EINVAL; |
| 223 | if (hdr->request_len > BLK_MAX_CDB) |
| 224 | return -EINVAL; |
| 225 | if (hdr->dout_xfer_len > (q->max_sectors << 9) || |
| 226 | hdr->din_xfer_len > (q->max_sectors << 9)) |
| 227 | return -EIO; |
| 228 | |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 229 | switch (hdr->protocol) { |
| 230 | case BSG_PROTOCOL_SCSI: |
| 231 | switch (hdr->subprotocol) { |
| 232 | case BSG_SUB_PROTOCOL_SCSI_CMD: |
| 233 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: |
| 234 | break; |
| 235 | default: |
| 236 | ret = -EINVAL; |
| 237 | } |
| 238 | break; |
| 239 | default: |
| 240 | ret = -EINVAL; |
| 241 | } |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 242 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 243 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
FUJITA Tomonori | 15d10b6 | 2007-07-16 08:52:16 +0200 | [diff] [blame] | 244 | return ret; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | /* |
| 248 | * map sg_io_v4 to a request. |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 249 | */ |
| 250 | static struct request * |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 251 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 252 | { |
| 253 | request_queue_t *q = bd->queue; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 254 | struct request *rq, *next_rq = NULL; |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 255 | int ret, rw; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 256 | unsigned int dxfer_len; |
| 257 | void *dxferp = NULL; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 258 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 259 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
| 260 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, |
| 261 | hdr->din_xfer_len); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 262 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 263 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 264 | if (ret) |
| 265 | return ERR_PTR(ret); |
| 266 | |
| 267 | /* |
| 268 | * map scatter-gather elements seperately and string them to request |
| 269 | */ |
| 270 | rq = blk_get_request(q, rw, GFP_KERNEL); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 271 | if (!rq) |
| 272 | return ERR_PTR(-ENOMEM); |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 273 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM, |
| 274 | &bd->flags)); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 275 | if (ret) |
| 276 | goto out; |
| 277 | |
| 278 | if (rw == WRITE && hdr->din_xfer_len) { |
| 279 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { |
| 280 | ret = -EOPNOTSUPP; |
| 281 | goto out; |
| 282 | } |
| 283 | |
| 284 | next_rq = blk_get_request(q, READ, GFP_KERNEL); |
| 285 | if (!next_rq) { |
| 286 | ret = -ENOMEM; |
| 287 | goto out; |
| 288 | } |
| 289 | rq->next_rq = next_rq; |
| 290 | |
| 291 | dxferp = (void*)(unsigned long)hdr->din_xferp; |
| 292 | ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); |
| 293 | if (ret) |
| 294 | goto out; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 295 | } |
| 296 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 297 | if (hdr->dout_xfer_len) { |
| 298 | dxfer_len = hdr->dout_xfer_len; |
| 299 | dxferp = (void*)(unsigned long)hdr->dout_xferp; |
| 300 | } else if (hdr->din_xfer_len) { |
| 301 | dxfer_len = hdr->din_xfer_len; |
| 302 | dxferp = (void*)(unsigned long)hdr->din_xferp; |
| 303 | } else |
| 304 | dxfer_len = 0; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 305 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 306 | if (dxfer_len) { |
| 307 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 308 | if (ret) |
| 309 | goto out; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 310 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 311 | return rq; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 312 | out: |
| 313 | blk_put_request(rq); |
| 314 | if (next_rq) { |
| 315 | blk_rq_unmap_user(next_rq->bio); |
| 316 | blk_put_request(next_rq); |
| 317 | } |
| 318 | return ERR_PTR(ret); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | /* |
| 322 | * async completion call-back from the block layer, when scsi/ide/whatever |
| 323 | * calls end_that_request_last() on a request |
| 324 | */ |
| 325 | static void bsg_rq_end_io(struct request *rq, int uptodate) |
| 326 | { |
| 327 | struct bsg_command *bc = rq->end_io_data; |
| 328 | struct bsg_device *bd = bc->bd; |
| 329 | unsigned long flags; |
| 330 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 331 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
| 332 | bd->name, rq, bc, bc->bio, uptodate); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 333 | |
| 334 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); |
| 335 | |
| 336 | spin_lock_irqsave(&bd->lock, flags); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 337 | list_move_tail(&bc->list, &bd->done_list); |
| 338 | bd->done_cmds++; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 339 | spin_unlock_irqrestore(&bd->lock, flags); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 340 | |
| 341 | wake_up(&bd->wq_done); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | /* |
| 345 | * do final setup of a 'bc' and submit the matching 'rq' to the block |
| 346 | * layer for io |
| 347 | */ |
| 348 | static void bsg_add_command(struct bsg_device *bd, request_queue_t *q, |
| 349 | struct bsg_command *bc, struct request *rq) |
| 350 | { |
| 351 | rq->sense = bc->sense; |
| 352 | rq->sense_len = 0; |
| 353 | |
| 354 | /* |
| 355 | * add bc command to busy queue and submit rq for io |
| 356 | */ |
| 357 | bc->rq = rq; |
| 358 | bc->bio = rq->bio; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 359 | if (rq->next_rq) |
| 360 | bc->bidi_bio = rq->next_rq->bio; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 361 | bc->hdr.duration = jiffies; |
| 362 | spin_lock_irq(&bd->lock); |
| 363 | list_add_tail(&bc->list, &bd->busy_list); |
| 364 | spin_unlock_irq(&bd->lock); |
| 365 | |
| 366 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); |
| 367 | |
| 368 | rq->end_io_data = bc; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 369 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 370 | } |
| 371 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 372 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 373 | { |
| 374 | struct bsg_command *bc = NULL; |
| 375 | |
| 376 | spin_lock_irq(&bd->lock); |
| 377 | if (bd->done_cmds) { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 378 | bc = list_entry(bd->done_list.next, struct bsg_command, list); |
| 379 | list_del(&bc->list); |
| 380 | bd->done_cmds--; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 381 | } |
| 382 | spin_unlock_irq(&bd->lock); |
| 383 | |
| 384 | return bc; |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Get a finished command from the done list |
| 389 | */ |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 390 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 391 | { |
| 392 | struct bsg_command *bc; |
| 393 | int ret; |
| 394 | |
| 395 | do { |
| 396 | bc = bsg_next_done_cmd(bd); |
| 397 | if (bc) |
| 398 | break; |
| 399 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 400 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
| 401 | bc = ERR_PTR(-EAGAIN); |
| 402 | break; |
| 403 | } |
| 404 | |
| 405 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 406 | if (ret) { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 407 | bc = ERR_PTR(-ERESTARTSYS); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 408 | break; |
| 409 | } |
| 410 | } while (1); |
| 411 | |
| 412 | dprintk("%s: returning done %p\n", bd->name, bc); |
| 413 | |
| 414 | return bc; |
| 415 | } |
| 416 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 417 | 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] | 418 | struct bio *bio, struct bio *bidi_bio) |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 419 | { |
| 420 | int ret = 0; |
| 421 | |
| 422 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); |
| 423 | /* |
| 424 | * fill in all the output members |
| 425 | */ |
| 426 | hdr->device_status = status_byte(rq->errors); |
| 427 | hdr->transport_status = host_byte(rq->errors); |
| 428 | hdr->driver_status = driver_byte(rq->errors); |
| 429 | hdr->info = 0; |
| 430 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) |
| 431 | hdr->info |= SG_INFO_CHECK; |
| 432 | hdr->din_resid = rq->data_len; |
| 433 | hdr->response_len = 0; |
| 434 | |
| 435 | if (rq->sense_len && hdr->response) { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 436 | int len = min_t(unsigned int, hdr->max_response_len, |
| 437 | rq->sense_len); |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 438 | |
| 439 | ret = copy_to_user((void*)(unsigned long)hdr->response, |
| 440 | rq->sense, len); |
| 441 | if (!ret) |
| 442 | hdr->response_len = len; |
| 443 | else |
| 444 | ret = -EFAULT; |
| 445 | } |
| 446 | |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 447 | if (rq->next_rq) { |
| 448 | blk_rq_unmap_user(bidi_bio); |
| 449 | blk_put_request(rq->next_rq); |
| 450 | } |
| 451 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 452 | blk_rq_unmap_user(bio); |
| 453 | blk_put_request(rq); |
| 454 | |
| 455 | return ret; |
| 456 | } |
| 457 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 458 | static int bsg_complete_all_commands(struct bsg_device *bd) |
| 459 | { |
| 460 | struct bsg_command *bc; |
| 461 | int ret, tret; |
| 462 | |
| 463 | dprintk("%s: entered\n", bd->name); |
| 464 | |
| 465 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 466 | |
| 467 | /* |
| 468 | * wait for all commands to complete |
| 469 | */ |
| 470 | ret = 0; |
| 471 | do { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 472 | ret = bsg_io_schedule(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 473 | /* |
| 474 | * look for -ENODATA specifically -- we'll sometimes get |
| 475 | * -ERESTARTSYS when we've taken a signal, but we can't |
| 476 | * return until we're done freeing the queue, so ignore |
| 477 | * it. The signal will get handled when we're done freeing |
| 478 | * the bsg_device. |
| 479 | */ |
| 480 | } while (ret != -ENODATA); |
| 481 | |
| 482 | /* |
| 483 | * discard done commands |
| 484 | */ |
| 485 | ret = 0; |
| 486 | do { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 487 | spin_lock_irq(&bd->lock); |
| 488 | if (!bd->queued_cmds) { |
| 489 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 490 | break; |
| 491 | } |
FUJITA Tomonori | efba1a3 | 2007-06-07 13:24:06 +0200 | [diff] [blame] | 492 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 493 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 494 | bc = bsg_get_done_cmd(bd); |
| 495 | if (IS_ERR(bc)) |
| 496 | break; |
| 497 | |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 498 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
| 499 | bc->bidi_bio); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 500 | if (!ret) |
| 501 | ret = tret; |
| 502 | |
| 503 | bsg_free_command(bc); |
| 504 | } while (1); |
| 505 | |
| 506 | return ret; |
| 507 | } |
| 508 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 509 | static int |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 510 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
| 511 | const struct iovec *iov, ssize_t *bytes_read) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 512 | { |
| 513 | struct bsg_command *bc; |
| 514 | int nr_commands, ret; |
| 515 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 516 | if (count % sizeof(struct sg_io_v4)) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 517 | return -EINVAL; |
| 518 | |
| 519 | ret = 0; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 520 | nr_commands = count / sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 521 | while (nr_commands) { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 522 | bc = bsg_get_done_cmd(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 523 | if (IS_ERR(bc)) { |
| 524 | ret = PTR_ERR(bc); |
| 525 | break; |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * this is the only case where we need to copy data back |
| 530 | * after completing the request. so do that here, |
| 531 | * bsg_complete_work() cannot do that for us |
| 532 | */ |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 533 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
| 534 | bc->bidi_bio); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 535 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 536 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 537 | ret = -EFAULT; |
| 538 | |
| 539 | bsg_free_command(bc); |
| 540 | |
| 541 | if (ret) |
| 542 | break; |
| 543 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 544 | buf += sizeof(struct sg_io_v4); |
| 545 | *bytes_read += sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 546 | nr_commands--; |
| 547 | } |
| 548 | |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) |
| 553 | { |
| 554 | if (file->f_flags & O_NONBLOCK) |
| 555 | clear_bit(BSG_F_BLOCK, &bd->flags); |
| 556 | else |
| 557 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 558 | } |
| 559 | |
| 560 | static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file) |
| 561 | { |
| 562 | if (file->f_mode & FMODE_WRITE) |
| 563 | set_bit(BSG_F_WRITE_PERM, &bd->flags); |
| 564 | else |
| 565 | clear_bit(BSG_F_WRITE_PERM, &bd->flags); |
| 566 | } |
| 567 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 568 | /* |
| 569 | * Check if the error is a "real" error that we should return. |
| 570 | */ |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 571 | static inline int err_block_err(int ret) |
| 572 | { |
| 573 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) |
| 574 | return 1; |
| 575 | |
| 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | static ssize_t |
| 580 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 581 | { |
| 582 | struct bsg_device *bd = file->private_data; |
| 583 | int ret; |
| 584 | ssize_t bytes_read; |
| 585 | |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 586 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 587 | |
| 588 | bsg_set_block(bd, file); |
| 589 | bytes_read = 0; |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 590 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 591 | *ppos = bytes_read; |
| 592 | |
| 593 | if (!bytes_read || (bytes_read && err_block_err(ret))) |
| 594 | bytes_read = ret; |
| 595 | |
| 596 | return bytes_read; |
| 597 | } |
| 598 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 599 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
| 600 | size_t count, ssize_t *bytes_written) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 601 | { |
| 602 | struct bsg_command *bc; |
| 603 | struct request *rq; |
| 604 | int ret, nr_commands; |
| 605 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 606 | if (count % sizeof(struct sg_io_v4)) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 607 | return -EINVAL; |
| 608 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 609 | nr_commands = count / sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 610 | rq = NULL; |
| 611 | bc = NULL; |
| 612 | ret = 0; |
| 613 | while (nr_commands) { |
| 614 | request_queue_t *q = bd->queue; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 615 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 616 | bc = bsg_alloc_command(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 617 | if (IS_ERR(bc)) { |
| 618 | ret = PTR_ERR(bc); |
| 619 | bc = NULL; |
| 620 | break; |
| 621 | } |
| 622 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 623 | bc->uhdr = (struct sg_io_v4 __user *) buf; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 624 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
| 625 | ret = -EFAULT; |
| 626 | break; |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * get a request, fill in the blanks, and add to request queue |
| 631 | */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 632 | rq = bsg_map_hdr(bd, &bc->hdr); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 633 | if (IS_ERR(rq)) { |
| 634 | ret = PTR_ERR(rq); |
| 635 | rq = NULL; |
| 636 | break; |
| 637 | } |
| 638 | |
| 639 | bsg_add_command(bd, q, bc, rq); |
| 640 | bc = NULL; |
| 641 | rq = NULL; |
| 642 | nr_commands--; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 643 | buf += sizeof(struct sg_io_v4); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 644 | *bytes_written += sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 645 | } |
| 646 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 647 | if (bc) |
| 648 | bsg_free_command(bc); |
| 649 | |
| 650 | return ret; |
| 651 | } |
| 652 | |
| 653 | static ssize_t |
| 654 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
| 655 | { |
| 656 | struct bsg_device *bd = file->private_data; |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 657 | ssize_t bytes_written; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 658 | int ret; |
| 659 | |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 660 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 661 | |
| 662 | bsg_set_block(bd, file); |
| 663 | bsg_set_write_perm(bd, file); |
| 664 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 665 | bytes_written = 0; |
| 666 | ret = __bsg_write(bd, buf, count, &bytes_written); |
| 667 | *ppos = bytes_written; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 668 | |
| 669 | /* |
| 670 | * return bytes written on non-fatal errors |
| 671 | */ |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 672 | if (!bytes_written || (bytes_written && err_block_err(ret))) |
| 673 | bytes_written = ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 674 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 675 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
| 676 | return bytes_written; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 677 | } |
| 678 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 679 | static struct bsg_device *bsg_alloc_device(void) |
| 680 | { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 681 | struct bsg_device *bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 682 | |
| 683 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); |
| 684 | if (unlikely(!bd)) |
| 685 | return NULL; |
| 686 | |
| 687 | spin_lock_init(&bd->lock); |
| 688 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 689 | bd->max_queue = BSG_DEFAULT_CMDS; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 690 | |
| 691 | INIT_LIST_HEAD(&bd->busy_list); |
| 692 | INIT_LIST_HEAD(&bd->done_list); |
| 693 | INIT_HLIST_NODE(&bd->dev_list); |
| 694 | |
| 695 | init_waitqueue_head(&bd->wq_free); |
| 696 | init_waitqueue_head(&bd->wq_done); |
| 697 | return bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 698 | } |
| 699 | |
| 700 | static int bsg_put_device(struct bsg_device *bd) |
| 701 | { |
| 702 | int ret = 0; |
| 703 | |
| 704 | mutex_lock(&bsg_mutex); |
| 705 | |
| 706 | if (!atomic_dec_and_test(&bd->ref_count)) |
| 707 | goto out; |
| 708 | |
| 709 | dprintk("%s: tearing down\n", bd->name); |
| 710 | |
| 711 | /* |
| 712 | * close can always block |
| 713 | */ |
| 714 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 715 | |
| 716 | /* |
| 717 | * correct error detection baddies here again. it's the responsibility |
| 718 | * of the app to properly reap commands before close() if it wants |
| 719 | * fool-proof error detection |
| 720 | */ |
| 721 | ret = bsg_complete_all_commands(bd); |
| 722 | |
| 723 | blk_put_queue(bd->queue); |
| 724 | hlist_del(&bd->dev_list); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 725 | kfree(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 726 | out: |
| 727 | mutex_unlock(&bsg_mutex); |
| 728 | return ret; |
| 729 | } |
| 730 | |
| 731 | static struct bsg_device *bsg_add_device(struct inode *inode, |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 732 | struct request_queue *rq, |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 733 | struct file *file) |
| 734 | { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 735 | struct bsg_device *bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 736 | #ifdef BSG_DEBUG |
| 737 | unsigned char buf[32]; |
| 738 | #endif |
| 739 | |
| 740 | bd = bsg_alloc_device(); |
| 741 | if (!bd) |
| 742 | return ERR_PTR(-ENOMEM); |
| 743 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 744 | bd->queue = rq; |
| 745 | kobject_get(&rq->kobj); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 746 | bsg_set_block(bd, file); |
| 747 | |
| 748 | atomic_set(&bd->ref_count, 1); |
| 749 | bd->minor = iminor(inode); |
| 750 | mutex_lock(&bsg_mutex); |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 751 | hlist_add_head(&bd->dev_list, |
| 752 | &bsg_device_list[bd->minor & (BSG_LIST_ARRAY_SIZE - 1)]); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 753 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 754 | strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 755 | dprintk("bound to <%s>, max queue %d\n", |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 756 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 757 | |
| 758 | mutex_unlock(&bsg_mutex); |
| 759 | return bd; |
| 760 | } |
| 761 | |
| 762 | static struct bsg_device *__bsg_get_device(int minor) |
| 763 | { |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 764 | struct hlist_head *list; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 765 | struct bsg_device *bd = NULL; |
| 766 | struct hlist_node *entry; |
| 767 | |
| 768 | mutex_lock(&bsg_mutex); |
| 769 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 770 | list = &bsg_device_list[minor & (BSG_LIST_ARRAY_SIZE - 1)]; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 771 | hlist_for_each(entry, list) { |
| 772 | bd = hlist_entry(entry, struct bsg_device, dev_list); |
| 773 | if (bd->minor == minor) { |
| 774 | atomic_inc(&bd->ref_count); |
| 775 | break; |
| 776 | } |
| 777 | |
| 778 | bd = NULL; |
| 779 | } |
| 780 | |
| 781 | mutex_unlock(&bsg_mutex); |
| 782 | return bd; |
| 783 | } |
| 784 | |
| 785 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) |
| 786 | { |
| 787 | struct bsg_device *bd = __bsg_get_device(iminor(inode)); |
| 788 | struct bsg_class_device *bcd, *__bcd; |
| 789 | |
| 790 | if (bd) |
| 791 | return bd; |
| 792 | |
| 793 | /* |
| 794 | * find the class device |
| 795 | */ |
| 796 | bcd = NULL; |
| 797 | mutex_lock(&bsg_mutex); |
| 798 | list_for_each_entry(__bcd, &bsg_class_list, list) { |
| 799 | if (__bcd->minor == iminor(inode)) { |
| 800 | bcd = __bcd; |
| 801 | break; |
| 802 | } |
| 803 | } |
| 804 | mutex_unlock(&bsg_mutex); |
| 805 | |
| 806 | if (!bcd) |
| 807 | return ERR_PTR(-ENODEV); |
| 808 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 809 | return bsg_add_device(inode, bcd->queue, file); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | static int bsg_open(struct inode *inode, struct file *file) |
| 813 | { |
| 814 | struct bsg_device *bd = bsg_get_device(inode, file); |
| 815 | |
| 816 | if (IS_ERR(bd)) |
| 817 | return PTR_ERR(bd); |
| 818 | |
| 819 | file->private_data = bd; |
| 820 | return 0; |
| 821 | } |
| 822 | |
| 823 | static int bsg_release(struct inode *inode, struct file *file) |
| 824 | { |
| 825 | struct bsg_device *bd = file->private_data; |
| 826 | |
| 827 | file->private_data = NULL; |
| 828 | return bsg_put_device(bd); |
| 829 | } |
| 830 | |
| 831 | static unsigned int bsg_poll(struct file *file, poll_table *wait) |
| 832 | { |
| 833 | struct bsg_device *bd = file->private_data; |
| 834 | unsigned int mask = 0; |
| 835 | |
| 836 | poll_wait(file, &bd->wq_done, wait); |
| 837 | poll_wait(file, &bd->wq_free, wait); |
| 838 | |
| 839 | spin_lock_irq(&bd->lock); |
| 840 | if (!list_empty(&bd->done_list)) |
| 841 | mask |= POLLIN | POLLRDNORM; |
| 842 | if (bd->queued_cmds >= bd->max_queue) |
| 843 | mask |= POLLOUT; |
| 844 | spin_unlock_irq(&bd->lock); |
| 845 | |
| 846 | return mask; |
| 847 | } |
| 848 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 849 | 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] | 850 | { |
| 851 | struct bsg_device *bd = file->private_data; |
| 852 | int __user *uarg = (int __user *) arg; |
| 853 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 854 | switch (cmd) { |
| 855 | /* |
| 856 | * our own ioctls |
| 857 | */ |
| 858 | case SG_GET_COMMAND_Q: |
| 859 | return put_user(bd->max_queue, uarg); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 860 | case SG_SET_COMMAND_Q: { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 861 | int queue; |
| 862 | |
| 863 | if (get_user(queue, uarg)) |
| 864 | return -EFAULT; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 865 | if (queue < 1) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 866 | return -EINVAL; |
| 867 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 868 | spin_lock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 869 | bd->max_queue = queue; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 870 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 871 | return 0; |
| 872 | } |
| 873 | |
| 874 | /* |
| 875 | * SCSI/sg ioctls |
| 876 | */ |
| 877 | case SG_GET_VERSION_NUM: |
| 878 | case SCSI_IOCTL_GET_IDLUN: |
| 879 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 880 | case SG_SET_TIMEOUT: |
| 881 | case SG_GET_TIMEOUT: |
| 882 | case SG_GET_RESERVED_SIZE: |
| 883 | case SG_SET_RESERVED_SIZE: |
| 884 | case SG_EMULATED_HOST: |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 885 | case SCSI_IOCTL_SEND_COMMAND: { |
| 886 | void __user *uarg = (void __user *) arg; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 887 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 888 | } |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 889 | case SG_IO: { |
| 890 | struct request *rq; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 891 | struct bio *bio, *bidi_bio = NULL; |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 892 | struct sg_io_v4 hdr; |
| 893 | |
| 894 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) |
| 895 | return -EFAULT; |
| 896 | |
| 897 | rq = bsg_map_hdr(bd, &hdr); |
| 898 | if (IS_ERR(rq)) |
| 899 | return PTR_ERR(rq); |
| 900 | |
| 901 | bio = rq->bio; |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 902 | if (rq->next_rq) |
| 903 | bidi_bio = rq->next_rq->bio; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 904 | blk_execute_rq(bd->queue, NULL, rq, 0); |
FUJITA Tomonori | 2c9ecdf | 2007-07-16 08:52:15 +0200 | [diff] [blame] | 905 | blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 906 | |
| 907 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) |
| 908 | return -EFAULT; |
Jens Axboe | b711afa | 2006-12-20 11:25:23 +0100 | [diff] [blame] | 909 | |
| 910 | return 0; |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 911 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 912 | /* |
| 913 | * block device ioctls |
| 914 | */ |
| 915 | default: |
| 916 | #if 0 |
| 917 | return ioctl_by_bdev(bd->bdev, cmd, arg); |
| 918 | #else |
| 919 | return -ENOTTY; |
| 920 | #endif |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | static struct file_operations bsg_fops = { |
| 925 | .read = bsg_read, |
| 926 | .write = bsg_write, |
| 927 | .poll = bsg_poll, |
| 928 | .open = bsg_open, |
| 929 | .release = bsg_release, |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 930 | .unlocked_ioctl = bsg_ioctl, |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 931 | .owner = THIS_MODULE, |
| 932 | }; |
| 933 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 934 | void bsg_unregister_queue(struct request_queue *q) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 935 | { |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 936 | struct bsg_class_device *bcd = &q->bsg_dev; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 937 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 938 | WARN_ON(!bcd->class_dev); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 939 | |
| 940 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 941 | sysfs_remove_link(&q->kobj, "bsg"); |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 942 | class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor)); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 943 | bcd->class_dev = NULL; |
| 944 | list_del_init(&bcd->list); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 945 | bsg_device_nr--; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 946 | mutex_unlock(&bsg_mutex); |
| 947 | } |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 948 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 949 | |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 950 | int bsg_register_queue(struct request_queue *q, const char *name) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 951 | { |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 952 | struct bsg_class_device *bcd, *__bcd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 953 | dev_t dev; |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 954 | int ret = -EMFILE; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 955 | struct class_device *class_dev = NULL; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 956 | |
| 957 | /* |
| 958 | * we need a proper transport to send commands, not a stacked device |
| 959 | */ |
| 960 | if (!q->request_fn) |
| 961 | return 0; |
| 962 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 963 | bcd = &q->bsg_dev; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 964 | memset(bcd, 0, sizeof(*bcd)); |
| 965 | INIT_LIST_HEAD(&bcd->list); |
| 966 | |
| 967 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 968 | if (bsg_device_nr == BSG_MAX_DEVS) { |
| 969 | printk(KERN_ERR "bsg: too many bsg devices\n"); |
| 970 | goto err; |
| 971 | } |
| 972 | |
| 973 | retry: |
| 974 | list_for_each_entry(__bcd, &bsg_class_list, list) { |
| 975 | if (__bcd->minor == bsg_minor_idx) { |
| 976 | bsg_minor_idx++; |
| 977 | if (bsg_minor_idx == BSG_MAX_DEVS) |
| 978 | bsg_minor_idx = 0; |
| 979 | goto retry; |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | bcd->minor = bsg_minor_idx++; |
| 984 | if (bsg_minor_idx == BSG_MAX_DEVS) |
| 985 | bsg_minor_idx = 0; |
| 986 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 987 | bcd->queue = q; |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 988 | dev = MKDEV(bsg_major, bcd->minor); |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 989 | class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name); |
| 990 | if (IS_ERR(class_dev)) { |
| 991 | ret = PTR_ERR(class_dev); |
Jens Axboe | 264a047 | 2007-01-23 16:30:17 +0100 | [diff] [blame] | 992 | goto err; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 993 | } |
| 994 | bcd->class_dev = class_dev; |
| 995 | |
Linus Torvalds | abce891 | 2007-07-16 11:18:23 -0700 | [diff] [blame] | 996 | if (q->kobj.sd) { |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 997 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
| 998 | if (ret) |
| 999 | goto err; |
| 1000 | } |
| 1001 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1002 | list_add_tail(&bcd->list, &bsg_class_list); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1003 | bsg_device_nr++; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1004 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1005 | mutex_unlock(&bsg_mutex); |
| 1006 | return 0; |
Jens Axboe | 264a047 | 2007-01-23 16:30:17 +0100 | [diff] [blame] | 1007 | err: |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1008 | if (class_dev) |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1009 | class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor)); |
Jens Axboe | 264a047 | 2007-01-23 16:30:17 +0100 | [diff] [blame] | 1010 | mutex_unlock(&bsg_mutex); |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1011 | return ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1012 | } |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 1013 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1014 | |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1015 | static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf) |
| 1016 | { |
| 1017 | int ret; |
| 1018 | struct scsi_device *sdp = to_scsi_device(cl_dev->dev); |
| 1019 | struct request_queue *rq = sdp->request_queue; |
| 1020 | |
| 1021 | if (rq->kobj.parent) |
| 1022 | ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent)); |
| 1023 | else |
| 1024 | ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj)); |
| 1025 | return ret; |
| 1026 | } |
| 1027 | |
| 1028 | static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
| 1029 | { |
| 1030 | bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue); |
| 1031 | } |
| 1032 | |
| 1033 | static struct class_interface bsg_intf = { |
| 1034 | .add = bsg_add, |
| 1035 | .remove = bsg_remove, |
| 1036 | }; |
| 1037 | |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1038 | static struct cdev bsg_cdev = { |
| 1039 | .kobj = {.name = "bsg", }, |
| 1040 | .owner = THIS_MODULE, |
| 1041 | }; |
| 1042 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1043 | static int __init bsg_init(void) |
| 1044 | { |
| 1045 | int ret, i; |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1046 | dev_t devid; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1047 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1048 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
| 1049 | sizeof(struct bsg_command), 0, 0, NULL, NULL); |
| 1050 | if (!bsg_cmd_cachep) { |
| 1051 | printk(KERN_ERR "bsg: failed creating slab cache\n"); |
| 1052 | return -ENOMEM; |
| 1053 | } |
| 1054 | |
Jens Axboe | 25fd164 | 2007-07-17 08:52:29 +0200 | [diff] [blame] | 1055 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1056 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
| 1057 | |
| 1058 | bsg_class = class_create(THIS_MODULE, "bsg"); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1059 | if (IS_ERR(bsg_class)) { |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame^] | 1060 | ret = PTR_ERR(bsg_class); |
| 1061 | goto destroy_kmemcache; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1062 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1063 | |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1064 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame^] | 1065 | if (ret) |
| 1066 | goto destroy_bsg_class; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1067 | |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1068 | bsg_major = MAJOR(devid); |
| 1069 | |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1070 | cdev_init(&bsg_cdev, &bsg_fops); |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1071 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame^] | 1072 | if (ret) |
| 1073 | goto unregister_chrdev; |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1074 | |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1075 | ret = scsi_register_interface(&bsg_intf); |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame^] | 1076 | if (ret) |
| 1077 | goto remove_cdev; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1078 | |
Jens Axboe | 46f6ef4 | 2007-07-17 08:56:10 +0200 | [diff] [blame] | 1079 | printk(KERN_INFO "%s loaded (major %d)\n", bsg_version, bsg_major); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1080 | return 0; |
FUJITA Tomonori | 9b9f770 | 2007-07-17 12:20:46 +0200 | [diff] [blame^] | 1081 | remove_cdev: |
| 1082 | printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret); |
| 1083 | cdev_del(&bsg_cdev); |
| 1084 | unregister_chrdev: |
| 1085 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
| 1086 | destroy_bsg_class: |
| 1087 | class_destroy(bsg_class); |
| 1088 | destroy_kmemcache: |
| 1089 | kmem_cache_destroy(bsg_cmd_cachep); |
| 1090 | return ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1091 | } |
| 1092 | |
| 1093 | MODULE_AUTHOR("Jens Axboe"); |
| 1094 | MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver"); |
| 1095 | MODULE_LICENSE("GPL"); |
| 1096 | |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1097 | device_initcall(bsg_init); |