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 | |
| 36 | static char bsg_version[] = "block layer sg (bsg) 0.4"; |
| 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 | |
| 71 | #define list_entry_bc(entry) list_entry((entry), struct bsg_command, list) |
| 72 | |
| 73 | /* |
| 74 | * just for testing |
| 75 | */ |
| 76 | #define BSG_MAJOR (240) |
| 77 | |
| 78 | static DEFINE_MUTEX(bsg_mutex); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 79 | static int bsg_device_nr, bsg_minor_idx; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 80 | |
| 81 | #define BSG_LIST_SIZE (8) |
| 82 | #define bsg_list_idx(minor) ((minor) & (BSG_LIST_SIZE - 1)) |
| 83 | static struct hlist_head bsg_device_list[BSG_LIST_SIZE]; |
| 84 | |
| 85 | static struct class *bsg_class; |
| 86 | static LIST_HEAD(bsg_class_list); |
| 87 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 88 | static struct kmem_cache *bsg_cmd_cachep; |
| 89 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 90 | /* |
| 91 | * our internal command type |
| 92 | */ |
| 93 | struct bsg_command { |
| 94 | struct bsg_device *bd; |
| 95 | struct list_head list; |
| 96 | struct request *rq; |
| 97 | struct bio *bio; |
| 98 | int err; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 99 | struct sg_io_v4 hdr; |
| 100 | struct sg_io_v4 __user *uhdr; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 101 | char sense[SCSI_SENSE_BUFFERSIZE]; |
| 102 | }; |
| 103 | |
| 104 | static void bsg_free_command(struct bsg_command *bc) |
| 105 | { |
| 106 | struct bsg_device *bd = bc->bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 107 | unsigned long flags; |
| 108 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 109 | kmem_cache_free(bsg_cmd_cachep, bc); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 110 | |
| 111 | spin_lock_irqsave(&bd->lock, flags); |
| 112 | bd->queued_cmds--; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 113 | spin_unlock_irqrestore(&bd->lock, flags); |
| 114 | |
| 115 | wake_up(&bd->wq_free); |
| 116 | } |
| 117 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 118 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 119 | { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 120 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 121 | |
| 122 | spin_lock_irq(&bd->lock); |
| 123 | |
| 124 | if (bd->queued_cmds >= bd->max_queue) |
| 125 | goto out; |
| 126 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 127 | bd->queued_cmds++; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 128 | spin_unlock_irq(&bd->lock); |
| 129 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 130 | bc = kmem_cache_alloc(bsg_cmd_cachep, GFP_USER); |
| 131 | if (unlikely(!bc)) { |
| 132 | spin_lock_irq(&bd->lock); |
FUJITA Tomonori | 7e75d73 | 2007-01-24 09:05:54 +0100 | [diff] [blame] | 133 | bd->queued_cmds--; |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 134 | bc = ERR_PTR(-ENOMEM); |
FUJITA Tomonori | 7e75d73 | 2007-01-24 09:05:54 +0100 | [diff] [blame] | 135 | goto out; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 136 | } |
| 137 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 138 | memset(bc, 0, sizeof(*bc)); |
| 139 | bc->bd = bd; |
| 140 | INIT_LIST_HEAD(&bc->list); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 141 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 142 | return bc; |
| 143 | out: |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 144 | spin_unlock_irq(&bd->lock); |
| 145 | return bc; |
| 146 | } |
| 147 | |
| 148 | static inline void |
| 149 | bsg_del_done_cmd(struct bsg_device *bd, struct bsg_command *bc) |
| 150 | { |
| 151 | bd->done_cmds--; |
| 152 | list_del(&bc->list); |
| 153 | } |
| 154 | |
| 155 | static inline void |
| 156 | bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc) |
| 157 | { |
| 158 | bd->done_cmds++; |
| 159 | list_add_tail(&bc->list, &bd->done_list); |
| 160 | wake_up(&bd->wq_done); |
| 161 | } |
| 162 | |
| 163 | static inline int bsg_io_schedule(struct bsg_device *bd, int state) |
| 164 | { |
| 165 | DEFINE_WAIT(wait); |
| 166 | int ret = 0; |
| 167 | |
| 168 | spin_lock_irq(&bd->lock); |
| 169 | |
| 170 | BUG_ON(bd->done_cmds > bd->queued_cmds); |
| 171 | |
| 172 | /* |
| 173 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no |
| 174 | * work to do", even though we return -ENOSPC after this same test |
| 175 | * during bsg_write() -- there, it means our buffer can't have more |
| 176 | * bsg_commands added to it, thus has no space left. |
| 177 | */ |
| 178 | if (bd->done_cmds == bd->queued_cmds) { |
| 179 | ret = -ENODATA; |
| 180 | goto unlock; |
| 181 | } |
| 182 | |
| 183 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
| 184 | ret = -EAGAIN; |
| 185 | goto unlock; |
| 186 | } |
| 187 | |
| 188 | prepare_to_wait(&bd->wq_done, &wait, state); |
| 189 | spin_unlock_irq(&bd->lock); |
| 190 | io_schedule(); |
| 191 | finish_wait(&bd->wq_done, &wait); |
| 192 | |
| 193 | if ((state == TASK_INTERRUPTIBLE) && signal_pending(current)) |
| 194 | ret = -ERESTARTSYS; |
| 195 | |
| 196 | return ret; |
| 197 | unlock: |
| 198 | spin_unlock_irq(&bd->lock); |
| 199 | return ret; |
| 200 | } |
| 201 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 202 | static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq, |
| 203 | struct sg_io_v4 *hdr, int has_write_perm) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 204 | { |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 205 | memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */ |
| 206 | |
| 207 | if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, |
| 208 | hdr->request_len)) |
| 209 | return -EFAULT; |
| 210 | if (blk_verify_command(rq->cmd, has_write_perm)) |
| 211 | return -EPERM; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 212 | |
| 213 | /* |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 214 | * fill in request structure |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 215 | */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 216 | rq->cmd_len = hdr->request_len; |
| 217 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 218 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 219 | rq->timeout = (hdr->timeout * HZ) / 1000; |
| 220 | if (!rq->timeout) |
| 221 | rq->timeout = q->sg_timeout; |
| 222 | if (!rq->timeout) |
| 223 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 224 | |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | /* |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 229 | * Check if sg_io_v4 from user is allowed and valid |
| 230 | */ |
| 231 | static int |
| 232 | bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw) |
| 233 | { |
| 234 | if (hdr->guard != 'Q') |
| 235 | return -EINVAL; |
| 236 | if (hdr->request_len > BLK_MAX_CDB) |
| 237 | return -EINVAL; |
| 238 | if (hdr->dout_xfer_len > (q->max_sectors << 9) || |
| 239 | hdr->din_xfer_len > (q->max_sectors << 9)) |
| 240 | return -EIO; |
| 241 | |
| 242 | /* not supported currently */ |
| 243 | if (hdr->protocol || hdr->subprotocol) |
| 244 | return -EINVAL; |
| 245 | |
| 246 | /* |
| 247 | * looks sane, if no data then it should be fine from our POV |
| 248 | */ |
| 249 | if (!hdr->dout_xfer_len && !hdr->din_xfer_len) |
| 250 | return 0; |
| 251 | |
| 252 | /* not supported currently */ |
| 253 | if (hdr->dout_xfer_len && hdr->din_xfer_len) |
| 254 | return -EINVAL; |
| 255 | |
| 256 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * map sg_io_v4 to a request. |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 263 | */ |
| 264 | static struct request * |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 265 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 266 | { |
| 267 | request_queue_t *q = bd->queue; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 268 | struct request *rq; |
Jens Axboe | 2ef7086 | 2006-12-20 11:26:11 +0100 | [diff] [blame] | 269 | int ret, rw = 0; /* shut up gcc */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 270 | unsigned int dxfer_len; |
| 271 | void *dxferp = NULL; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 272 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 273 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
| 274 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, |
| 275 | hdr->din_xfer_len); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 276 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 277 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 278 | if (ret) |
| 279 | return ERR_PTR(ret); |
| 280 | |
| 281 | /* |
| 282 | * map scatter-gather elements seperately and string them to request |
| 283 | */ |
| 284 | rq = blk_get_request(q, rw, GFP_KERNEL); |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 285 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM, |
| 286 | &bd->flags)); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 287 | if (ret) { |
| 288 | blk_put_request(rq); |
| 289 | return ERR_PTR(ret); |
| 290 | } |
| 291 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 292 | if (hdr->dout_xfer_len) { |
| 293 | dxfer_len = hdr->dout_xfer_len; |
| 294 | dxferp = (void*)(unsigned long)hdr->dout_xferp; |
| 295 | } else if (hdr->din_xfer_len) { |
| 296 | dxfer_len = hdr->din_xfer_len; |
| 297 | dxferp = (void*)(unsigned long)hdr->din_xferp; |
| 298 | } else |
| 299 | dxfer_len = 0; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 300 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 301 | if (dxfer_len) { |
| 302 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); |
| 303 | if (ret) { |
| 304 | dprintk("failed map at %d\n", ret); |
| 305 | blk_put_request(rq); |
| 306 | rq = ERR_PTR(ret); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 307 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | return rq; |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * async completion call-back from the block layer, when scsi/ide/whatever |
| 315 | * calls end_that_request_last() on a request |
| 316 | */ |
| 317 | static void bsg_rq_end_io(struct request *rq, int uptodate) |
| 318 | { |
| 319 | struct bsg_command *bc = rq->end_io_data; |
| 320 | struct bsg_device *bd = bc->bd; |
| 321 | unsigned long flags; |
| 322 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 323 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
| 324 | bd->name, rq, bc, bc->bio, uptodate); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 325 | |
| 326 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); |
| 327 | |
| 328 | spin_lock_irqsave(&bd->lock, flags); |
| 329 | list_del(&bc->list); |
| 330 | bsg_add_done_cmd(bd, bc); |
| 331 | spin_unlock_irqrestore(&bd->lock, flags); |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * do final setup of a 'bc' and submit the matching 'rq' to the block |
| 336 | * layer for io |
| 337 | */ |
| 338 | static void bsg_add_command(struct bsg_device *bd, request_queue_t *q, |
| 339 | struct bsg_command *bc, struct request *rq) |
| 340 | { |
| 341 | rq->sense = bc->sense; |
| 342 | rq->sense_len = 0; |
| 343 | |
| 344 | /* |
| 345 | * add bc command to busy queue and submit rq for io |
| 346 | */ |
| 347 | bc->rq = rq; |
| 348 | bc->bio = rq->bio; |
| 349 | bc->hdr.duration = jiffies; |
| 350 | spin_lock_irq(&bd->lock); |
| 351 | list_add_tail(&bc->list, &bd->busy_list); |
| 352 | spin_unlock_irq(&bd->lock); |
| 353 | |
| 354 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); |
| 355 | |
| 356 | rq->end_io_data = bc; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 357 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | static inline struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
| 361 | { |
| 362 | struct bsg_command *bc = NULL; |
| 363 | |
| 364 | spin_lock_irq(&bd->lock); |
| 365 | if (bd->done_cmds) { |
| 366 | bc = list_entry_bc(bd->done_list.next); |
| 367 | bsg_del_done_cmd(bd, bc); |
| 368 | } |
| 369 | spin_unlock_irq(&bd->lock); |
| 370 | |
| 371 | return bc; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Get a finished command from the done list |
| 376 | */ |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 377 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 378 | { |
| 379 | struct bsg_command *bc; |
| 380 | int ret; |
| 381 | |
| 382 | do { |
| 383 | bc = bsg_next_done_cmd(bd); |
| 384 | if (bc) |
| 385 | break; |
| 386 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 387 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
| 388 | bc = ERR_PTR(-EAGAIN); |
| 389 | break; |
| 390 | } |
| 391 | |
| 392 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 393 | if (ret) { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 394 | bc = ERR_PTR(-ERESTARTSYS); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 395 | break; |
| 396 | } |
| 397 | } while (1); |
| 398 | |
| 399 | dprintk("%s: returning done %p\n", bd->name, bc); |
| 400 | |
| 401 | return bc; |
| 402 | } |
| 403 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 404 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
| 405 | struct bio *bio) |
| 406 | { |
| 407 | int ret = 0; |
| 408 | |
| 409 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); |
| 410 | /* |
| 411 | * fill in all the output members |
| 412 | */ |
| 413 | hdr->device_status = status_byte(rq->errors); |
| 414 | hdr->transport_status = host_byte(rq->errors); |
| 415 | hdr->driver_status = driver_byte(rq->errors); |
| 416 | hdr->info = 0; |
| 417 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) |
| 418 | hdr->info |= SG_INFO_CHECK; |
| 419 | hdr->din_resid = rq->data_len; |
| 420 | hdr->response_len = 0; |
| 421 | |
| 422 | if (rq->sense_len && hdr->response) { |
| 423 | int len = min((unsigned int) hdr->max_response_len, |
| 424 | rq->sense_len); |
| 425 | |
| 426 | ret = copy_to_user((void*)(unsigned long)hdr->response, |
| 427 | rq->sense, len); |
| 428 | if (!ret) |
| 429 | hdr->response_len = len; |
| 430 | else |
| 431 | ret = -EFAULT; |
| 432 | } |
| 433 | |
| 434 | blk_rq_unmap_user(bio); |
| 435 | blk_put_request(rq); |
| 436 | |
| 437 | return ret; |
| 438 | } |
| 439 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 440 | static int bsg_complete_all_commands(struct bsg_device *bd) |
| 441 | { |
| 442 | struct bsg_command *bc; |
| 443 | int ret, tret; |
| 444 | |
| 445 | dprintk("%s: entered\n", bd->name); |
| 446 | |
| 447 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 448 | |
| 449 | /* |
| 450 | * wait for all commands to complete |
| 451 | */ |
| 452 | ret = 0; |
| 453 | do { |
| 454 | ret = bsg_io_schedule(bd, TASK_UNINTERRUPTIBLE); |
| 455 | /* |
| 456 | * look for -ENODATA specifically -- we'll sometimes get |
| 457 | * -ERESTARTSYS when we've taken a signal, but we can't |
| 458 | * return until we're done freeing the queue, so ignore |
| 459 | * it. The signal will get handled when we're done freeing |
| 460 | * the bsg_device. |
| 461 | */ |
| 462 | } while (ret != -ENODATA); |
| 463 | |
| 464 | /* |
| 465 | * discard done commands |
| 466 | */ |
| 467 | ret = 0; |
| 468 | do { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 469 | spin_lock_irq(&bd->lock); |
| 470 | if (!bd->queued_cmds) { |
| 471 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 472 | break; |
| 473 | } |
FUJITA Tomonori | efba1a3 | 2007-06-07 13:24:06 +0200 | [diff] [blame^] | 474 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 475 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 476 | bc = bsg_get_done_cmd(bd); |
| 477 | if (IS_ERR(bc)) |
| 478 | break; |
| 479 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 480 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 481 | if (!ret) |
| 482 | ret = tret; |
| 483 | |
| 484 | bsg_free_command(bc); |
| 485 | } while (1); |
| 486 | |
| 487 | return ret; |
| 488 | } |
| 489 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 490 | static ssize_t |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 491 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
| 492 | const struct iovec *iov, ssize_t *bytes_read) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 493 | { |
| 494 | struct bsg_command *bc; |
| 495 | int nr_commands, ret; |
| 496 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 497 | if (count % sizeof(struct sg_io_v4)) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 498 | return -EINVAL; |
| 499 | |
| 500 | ret = 0; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 501 | nr_commands = count / sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 502 | while (nr_commands) { |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 503 | bc = bsg_get_done_cmd(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 504 | if (IS_ERR(bc)) { |
| 505 | ret = PTR_ERR(bc); |
| 506 | break; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * this is the only case where we need to copy data back |
| 511 | * after completing the request. so do that here, |
| 512 | * bsg_complete_work() cannot do that for us |
| 513 | */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 514 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 515 | |
| 516 | if (copy_to_user(buf, (char *) &bc->hdr, sizeof(bc->hdr))) |
| 517 | ret = -EFAULT; |
| 518 | |
| 519 | bsg_free_command(bc); |
| 520 | |
| 521 | if (ret) |
| 522 | break; |
| 523 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 524 | buf += sizeof(struct sg_io_v4); |
| 525 | *bytes_read += sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 526 | nr_commands--; |
| 527 | } |
| 528 | |
| 529 | return ret; |
| 530 | } |
| 531 | |
| 532 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) |
| 533 | { |
| 534 | if (file->f_flags & O_NONBLOCK) |
| 535 | clear_bit(BSG_F_BLOCK, &bd->flags); |
| 536 | else |
| 537 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 538 | } |
| 539 | |
| 540 | static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file) |
| 541 | { |
| 542 | if (file->f_mode & FMODE_WRITE) |
| 543 | set_bit(BSG_F_WRITE_PERM, &bd->flags); |
| 544 | else |
| 545 | clear_bit(BSG_F_WRITE_PERM, &bd->flags); |
| 546 | } |
| 547 | |
| 548 | static inline int err_block_err(int ret) |
| 549 | { |
| 550 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) |
| 551 | return 1; |
| 552 | |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | static ssize_t |
| 557 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 558 | { |
| 559 | struct bsg_device *bd = file->private_data; |
| 560 | int ret; |
| 561 | ssize_t bytes_read; |
| 562 | |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 563 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 564 | |
| 565 | bsg_set_block(bd, file); |
| 566 | bytes_read = 0; |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 567 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 568 | *ppos = bytes_read; |
| 569 | |
| 570 | if (!bytes_read || (bytes_read && err_block_err(ret))) |
| 571 | bytes_read = ret; |
| 572 | |
| 573 | return bytes_read; |
| 574 | } |
| 575 | |
| 576 | static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf, |
| 577 | size_t count, ssize_t *bytes_read) |
| 578 | { |
| 579 | struct bsg_command *bc; |
| 580 | struct request *rq; |
| 581 | int ret, nr_commands; |
| 582 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 583 | if (count % sizeof(struct sg_io_v4)) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 584 | return -EINVAL; |
| 585 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 586 | nr_commands = count / sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 587 | rq = NULL; |
| 588 | bc = NULL; |
| 589 | ret = 0; |
| 590 | while (nr_commands) { |
| 591 | request_queue_t *q = bd->queue; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 592 | |
FUJITA Tomonori | e7d7217 | 2007-05-08 15:32:03 +0200 | [diff] [blame] | 593 | bc = bsg_alloc_command(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 594 | if (IS_ERR(bc)) { |
| 595 | ret = PTR_ERR(bc); |
| 596 | bc = NULL; |
| 597 | break; |
| 598 | } |
| 599 | |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 600 | bc->uhdr = (struct sg_io_v4 __user *) buf; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 601 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
| 602 | ret = -EFAULT; |
| 603 | break; |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * get a request, fill in the blanks, and add to request queue |
| 608 | */ |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 609 | rq = bsg_map_hdr(bd, &bc->hdr); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 610 | if (IS_ERR(rq)) { |
| 611 | ret = PTR_ERR(rq); |
| 612 | rq = NULL; |
| 613 | break; |
| 614 | } |
| 615 | |
| 616 | bsg_add_command(bd, q, bc, rq); |
| 617 | bc = NULL; |
| 618 | rq = NULL; |
| 619 | nr_commands--; |
FUJITA Tomonori | 70e36ec | 2006-12-20 11:20:15 +0100 | [diff] [blame] | 620 | buf += sizeof(struct sg_io_v4); |
| 621 | *bytes_read += sizeof(struct sg_io_v4); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 622 | } |
| 623 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 624 | if (bc) |
| 625 | bsg_free_command(bc); |
| 626 | |
| 627 | return ret; |
| 628 | } |
| 629 | |
| 630 | static ssize_t |
| 631 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
| 632 | { |
| 633 | struct bsg_device *bd = file->private_data; |
| 634 | ssize_t bytes_read; |
| 635 | int ret; |
| 636 | |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 637 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 638 | |
| 639 | bsg_set_block(bd, file); |
| 640 | bsg_set_write_perm(bd, file); |
| 641 | |
| 642 | bytes_read = 0; |
| 643 | ret = __bsg_write(bd, buf, count, &bytes_read); |
| 644 | *ppos = bytes_read; |
| 645 | |
| 646 | /* |
| 647 | * return bytes written on non-fatal errors |
| 648 | */ |
| 649 | if (!bytes_read || (bytes_read && err_block_err(ret))) |
| 650 | bytes_read = ret; |
| 651 | |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 652 | dprintk("%s: returning %Zd\n", bd->name, bytes_read); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 653 | return bytes_read; |
| 654 | } |
| 655 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 656 | static struct bsg_device *bsg_alloc_device(void) |
| 657 | { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 658 | struct bsg_device *bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 659 | |
| 660 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); |
| 661 | if (unlikely(!bd)) |
| 662 | return NULL; |
| 663 | |
| 664 | spin_lock_init(&bd->lock); |
| 665 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 666 | bd->max_queue = BSG_DEFAULT_CMDS; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 667 | |
| 668 | INIT_LIST_HEAD(&bd->busy_list); |
| 669 | INIT_LIST_HEAD(&bd->done_list); |
| 670 | INIT_HLIST_NODE(&bd->dev_list); |
| 671 | |
| 672 | init_waitqueue_head(&bd->wq_free); |
| 673 | init_waitqueue_head(&bd->wq_done); |
| 674 | return bd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 675 | } |
| 676 | |
| 677 | static int bsg_put_device(struct bsg_device *bd) |
| 678 | { |
| 679 | int ret = 0; |
| 680 | |
| 681 | mutex_lock(&bsg_mutex); |
| 682 | |
| 683 | if (!atomic_dec_and_test(&bd->ref_count)) |
| 684 | goto out; |
| 685 | |
| 686 | dprintk("%s: tearing down\n", bd->name); |
| 687 | |
| 688 | /* |
| 689 | * close can always block |
| 690 | */ |
| 691 | set_bit(BSG_F_BLOCK, &bd->flags); |
| 692 | |
| 693 | /* |
| 694 | * correct error detection baddies here again. it's the responsibility |
| 695 | * of the app to properly reap commands before close() if it wants |
| 696 | * fool-proof error detection |
| 697 | */ |
| 698 | ret = bsg_complete_all_commands(bd); |
| 699 | |
| 700 | blk_put_queue(bd->queue); |
| 701 | hlist_del(&bd->dev_list); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 702 | kfree(bd); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 703 | out: |
| 704 | mutex_unlock(&bsg_mutex); |
| 705 | return ret; |
| 706 | } |
| 707 | |
| 708 | static struct bsg_device *bsg_add_device(struct inode *inode, |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 709 | struct request_queue *rq, |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 710 | struct file *file) |
| 711 | { |
| 712 | struct bsg_device *bd = NULL; |
| 713 | #ifdef BSG_DEBUG |
| 714 | unsigned char buf[32]; |
| 715 | #endif |
| 716 | |
| 717 | bd = bsg_alloc_device(); |
| 718 | if (!bd) |
| 719 | return ERR_PTR(-ENOMEM); |
| 720 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 721 | bd->queue = rq; |
| 722 | kobject_get(&rq->kobj); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 723 | bsg_set_block(bd, file); |
| 724 | |
| 725 | atomic_set(&bd->ref_count, 1); |
| 726 | bd->minor = iminor(inode); |
| 727 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 728 | hlist_add_head(&bd->dev_list, &bsg_device_list[bsg_list_idx(bd->minor)]); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 729 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 730 | 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] | 731 | dprintk("bound to <%s>, max queue %d\n", |
FUJITA Tomonori | 9e69fbb | 2006-12-20 11:18:22 +0100 | [diff] [blame] | 732 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 733 | |
| 734 | mutex_unlock(&bsg_mutex); |
| 735 | return bd; |
| 736 | } |
| 737 | |
| 738 | static struct bsg_device *__bsg_get_device(int minor) |
| 739 | { |
| 740 | struct hlist_head *list = &bsg_device_list[bsg_list_idx(minor)]; |
| 741 | struct bsg_device *bd = NULL; |
| 742 | struct hlist_node *entry; |
| 743 | |
| 744 | mutex_lock(&bsg_mutex); |
| 745 | |
| 746 | hlist_for_each(entry, list) { |
| 747 | bd = hlist_entry(entry, struct bsg_device, dev_list); |
| 748 | if (bd->minor == minor) { |
| 749 | atomic_inc(&bd->ref_count); |
| 750 | break; |
| 751 | } |
| 752 | |
| 753 | bd = NULL; |
| 754 | } |
| 755 | |
| 756 | mutex_unlock(&bsg_mutex); |
| 757 | return bd; |
| 758 | } |
| 759 | |
| 760 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) |
| 761 | { |
| 762 | struct bsg_device *bd = __bsg_get_device(iminor(inode)); |
| 763 | struct bsg_class_device *bcd, *__bcd; |
| 764 | |
| 765 | if (bd) |
| 766 | return bd; |
| 767 | |
| 768 | /* |
| 769 | * find the class device |
| 770 | */ |
| 771 | bcd = NULL; |
| 772 | mutex_lock(&bsg_mutex); |
| 773 | list_for_each_entry(__bcd, &bsg_class_list, list) { |
| 774 | if (__bcd->minor == iminor(inode)) { |
| 775 | bcd = __bcd; |
| 776 | break; |
| 777 | } |
| 778 | } |
| 779 | mutex_unlock(&bsg_mutex); |
| 780 | |
| 781 | if (!bcd) |
| 782 | return ERR_PTR(-ENODEV); |
| 783 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 784 | return bsg_add_device(inode, bcd->queue, file); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 785 | } |
| 786 | |
| 787 | static int bsg_open(struct inode *inode, struct file *file) |
| 788 | { |
| 789 | struct bsg_device *bd = bsg_get_device(inode, file); |
| 790 | |
| 791 | if (IS_ERR(bd)) |
| 792 | return PTR_ERR(bd); |
| 793 | |
| 794 | file->private_data = bd; |
| 795 | return 0; |
| 796 | } |
| 797 | |
| 798 | static int bsg_release(struct inode *inode, struct file *file) |
| 799 | { |
| 800 | struct bsg_device *bd = file->private_data; |
| 801 | |
| 802 | file->private_data = NULL; |
| 803 | return bsg_put_device(bd); |
| 804 | } |
| 805 | |
| 806 | static unsigned int bsg_poll(struct file *file, poll_table *wait) |
| 807 | { |
| 808 | struct bsg_device *bd = file->private_data; |
| 809 | unsigned int mask = 0; |
| 810 | |
| 811 | poll_wait(file, &bd->wq_done, wait); |
| 812 | poll_wait(file, &bd->wq_free, wait); |
| 813 | |
| 814 | spin_lock_irq(&bd->lock); |
| 815 | if (!list_empty(&bd->done_list)) |
| 816 | mask |= POLLIN | POLLRDNORM; |
| 817 | if (bd->queued_cmds >= bd->max_queue) |
| 818 | mask |= POLLOUT; |
| 819 | spin_unlock_irq(&bd->lock); |
| 820 | |
| 821 | return mask; |
| 822 | } |
| 823 | |
| 824 | static int |
| 825 | bsg_ioctl(struct inode *inode, struct file *file, unsigned int cmd, |
| 826 | unsigned long arg) |
| 827 | { |
| 828 | struct bsg_device *bd = file->private_data; |
| 829 | int __user *uarg = (int __user *) arg; |
| 830 | |
| 831 | if (!bd) |
| 832 | return -ENXIO; |
| 833 | |
| 834 | switch (cmd) { |
| 835 | /* |
| 836 | * our own ioctls |
| 837 | */ |
| 838 | case SG_GET_COMMAND_Q: |
| 839 | return put_user(bd->max_queue, uarg); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 840 | case SG_SET_COMMAND_Q: { |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 841 | int queue; |
| 842 | |
| 843 | if (get_user(queue, uarg)) |
| 844 | return -EFAULT; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 845 | if (queue < 1) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 846 | return -EINVAL; |
| 847 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 848 | spin_lock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 849 | bd->max_queue = queue; |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 850 | spin_unlock_irq(&bd->lock); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * SCSI/sg ioctls |
| 856 | */ |
| 857 | case SG_GET_VERSION_NUM: |
| 858 | case SCSI_IOCTL_GET_IDLUN: |
| 859 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 860 | case SG_SET_TIMEOUT: |
| 861 | case SG_GET_TIMEOUT: |
| 862 | case SG_GET_RESERVED_SIZE: |
| 863 | case SG_SET_RESERVED_SIZE: |
| 864 | case SG_EMULATED_HOST: |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 865 | case SCSI_IOCTL_SEND_COMMAND: { |
| 866 | void __user *uarg = (void __user *) arg; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 867 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 868 | } |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 869 | case SG_IO: { |
| 870 | struct request *rq; |
| 871 | struct bio *bio; |
| 872 | struct sg_io_v4 hdr; |
| 873 | |
| 874 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) |
| 875 | return -EFAULT; |
| 876 | |
| 877 | rq = bsg_map_hdr(bd, &hdr); |
| 878 | if (IS_ERR(rq)) |
| 879 | return PTR_ERR(rq); |
| 880 | |
| 881 | bio = rq->bio; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 882 | blk_execute_rq(bd->queue, NULL, rq, 0); |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 883 | blk_complete_sgv4_hdr_rq(rq, &hdr, bio); |
| 884 | |
| 885 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) |
| 886 | return -EFAULT; |
Jens Axboe | b711afa | 2006-12-20 11:25:23 +0100 | [diff] [blame] | 887 | |
| 888 | return 0; |
FUJITA Tomonori | 10e8855 | 2006-12-20 11:20:57 +0100 | [diff] [blame] | 889 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 890 | /* |
| 891 | * block device ioctls |
| 892 | */ |
| 893 | default: |
| 894 | #if 0 |
| 895 | return ioctl_by_bdev(bd->bdev, cmd, arg); |
| 896 | #else |
| 897 | return -ENOTTY; |
| 898 | #endif |
| 899 | } |
| 900 | } |
| 901 | |
| 902 | static struct file_operations bsg_fops = { |
| 903 | .read = bsg_read, |
| 904 | .write = bsg_write, |
| 905 | .poll = bsg_poll, |
| 906 | .open = bsg_open, |
| 907 | .release = bsg_release, |
| 908 | .ioctl = bsg_ioctl, |
| 909 | .owner = THIS_MODULE, |
| 910 | }; |
| 911 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 912 | void bsg_unregister_queue(struct request_queue *q) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 913 | { |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 914 | struct bsg_class_device *bcd = &q->bsg_dev; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 915 | |
| 916 | if (!bcd->class_dev) |
| 917 | return; |
| 918 | |
| 919 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 920 | sysfs_remove_link(&q->kobj, "bsg"); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 921 | class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor)); |
| 922 | bcd->class_dev = NULL; |
| 923 | list_del_init(&bcd->list); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 924 | bsg_device_nr--; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 925 | mutex_unlock(&bsg_mutex); |
| 926 | } |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 927 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 928 | |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 929 | int bsg_register_queue(struct request_queue *q, const char *name) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 930 | { |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 931 | struct bsg_class_device *bcd, *__bcd; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 932 | dev_t dev; |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 933 | int ret = -EMFILE; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 934 | struct class_device *class_dev = NULL; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 935 | |
| 936 | /* |
| 937 | * we need a proper transport to send commands, not a stacked device |
| 938 | */ |
| 939 | if (!q->request_fn) |
| 940 | return 0; |
| 941 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 942 | bcd = &q->bsg_dev; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 943 | memset(bcd, 0, sizeof(*bcd)); |
| 944 | INIT_LIST_HEAD(&bcd->list); |
| 945 | |
| 946 | mutex_lock(&bsg_mutex); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 947 | if (bsg_device_nr == BSG_MAX_DEVS) { |
| 948 | printk(KERN_ERR "bsg: too many bsg devices\n"); |
| 949 | goto err; |
| 950 | } |
| 951 | |
| 952 | retry: |
| 953 | list_for_each_entry(__bcd, &bsg_class_list, list) { |
| 954 | if (__bcd->minor == bsg_minor_idx) { |
| 955 | bsg_minor_idx++; |
| 956 | if (bsg_minor_idx == BSG_MAX_DEVS) |
| 957 | bsg_minor_idx = 0; |
| 958 | goto retry; |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | bcd->minor = bsg_minor_idx++; |
| 963 | if (bsg_minor_idx == BSG_MAX_DEVS) |
| 964 | bsg_minor_idx = 0; |
| 965 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 966 | bcd->queue = q; |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 967 | dev = MKDEV(BSG_MAJOR, bcd->minor); |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 968 | class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name); |
| 969 | if (IS_ERR(class_dev)) { |
| 970 | ret = PTR_ERR(class_dev); |
Jens Axboe | 264a047 | 2007-01-23 16:30:17 +0100 | [diff] [blame] | 971 | goto err; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 972 | } |
| 973 | bcd->class_dev = class_dev; |
| 974 | |
| 975 | if (q->kobj.dentry) { |
| 976 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
| 977 | if (ret) |
| 978 | goto err; |
| 979 | } |
| 980 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 981 | list_add_tail(&bcd->list, &bsg_class_list); |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 982 | bsg_device_nr++; |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 983 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 984 | mutex_unlock(&bsg_mutex); |
| 985 | return 0; |
Jens Axboe | 264a047 | 2007-01-23 16:30:17 +0100 | [diff] [blame] | 986 | err: |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 987 | if (class_dev) |
Jens Axboe | 264a047 | 2007-01-23 16:30:17 +0100 | [diff] [blame] | 988 | class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor)); |
| 989 | mutex_unlock(&bsg_mutex); |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 990 | return ret; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 991 | } |
FUJITA Tomonori | 4cf0723 | 2007-03-30 11:19:39 +0200 | [diff] [blame] | 992 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 993 | |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 994 | static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf) |
| 995 | { |
| 996 | int ret; |
| 997 | struct scsi_device *sdp = to_scsi_device(cl_dev->dev); |
| 998 | struct request_queue *rq = sdp->request_queue; |
| 999 | |
| 1000 | if (rq->kobj.parent) |
| 1001 | ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent)); |
| 1002 | else |
| 1003 | ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj)); |
| 1004 | return ret; |
| 1005 | } |
| 1006 | |
| 1007 | static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
| 1008 | { |
| 1009 | bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue); |
| 1010 | } |
| 1011 | |
| 1012 | static struct class_interface bsg_intf = { |
| 1013 | .add = bsg_add, |
| 1014 | .remove = bsg_remove, |
| 1015 | }; |
| 1016 | |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1017 | static struct cdev bsg_cdev = { |
| 1018 | .kobj = {.name = "bsg", }, |
| 1019 | .owner = THIS_MODULE, |
| 1020 | }; |
| 1021 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1022 | static int __init bsg_init(void) |
| 1023 | { |
| 1024 | int ret, i; |
| 1025 | |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1026 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
| 1027 | sizeof(struct bsg_command), 0, 0, NULL, NULL); |
| 1028 | if (!bsg_cmd_cachep) { |
| 1029 | printk(KERN_ERR "bsg: failed creating slab cache\n"); |
| 1030 | return -ENOMEM; |
| 1031 | } |
| 1032 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1033 | for (i = 0; i < BSG_LIST_SIZE; i++) |
| 1034 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
| 1035 | |
| 1036 | bsg_class = class_create(THIS_MODULE, "bsg"); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1037 | if (IS_ERR(bsg_class)) { |
| 1038 | kmem_cache_destroy(bsg_cmd_cachep); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1039 | return PTR_ERR(bsg_class); |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1040 | } |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1041 | |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1042 | ret = register_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS, "bsg"); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1043 | if (ret) { |
Jens Axboe | 5309cb3 | 2007-01-23 16:24:41 +0100 | [diff] [blame] | 1044 | kmem_cache_destroy(bsg_cmd_cachep); |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1045 | class_destroy(bsg_class); |
| 1046 | return ret; |
| 1047 | } |
| 1048 | |
FUJITA Tomonori | 292b7f2 | 2007-03-28 13:29:58 +0200 | [diff] [blame] | 1049 | cdev_init(&bsg_cdev, &bsg_fops); |
| 1050 | ret = cdev_add(&bsg_cdev, MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS); |
| 1051 | if (ret) { |
| 1052 | kmem_cache_destroy(bsg_cmd_cachep); |
| 1053 | class_destroy(bsg_class); |
| 1054 | unregister_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS); |
| 1055 | return ret; |
| 1056 | } |
| 1057 | |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1058 | ret = scsi_register_interface(&bsg_intf); |
| 1059 | if (ret) { |
| 1060 | printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret); |
| 1061 | kmem_cache_destroy(bsg_cmd_cachep); |
| 1062 | class_destroy(bsg_class); |
| 1063 | unregister_chrdev(BSG_MAJOR, "bsg"); |
| 1064 | return ret; |
| 1065 | } |
| 1066 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 1067 | printk(KERN_INFO "%s loaded\n", bsg_version); |
| 1068 | return 0; |
| 1069 | } |
| 1070 | |
| 1071 | MODULE_AUTHOR("Jens Axboe"); |
| 1072 | MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver"); |
| 1073 | MODULE_LICENSE("GPL"); |
| 1074 | |
FUJITA Tomonori | 4e2872d | 2007-03-28 13:29:24 +0200 | [diff] [blame] | 1075 | device_initcall(bsg_init); |