Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1 | /* |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 2 | * Copyright (c) 2009, Microsoft Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 15 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
| 16 | * |
| 17 | * Authors: |
Haiyang Zhang | d0e94d1 | 2009-11-23 17:00:22 +0000 | [diff] [blame] | 18 | * Haiyang Zhang <haiyangz@microsoft.com> |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 19 | * Hank Janssen <hjanssen@microsoft.com> |
K. Y. Srinivasan | e757046 | 2011-05-10 07:54:00 -0700 | [diff] [blame] | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 21 | */ |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 22 | #include <linux/init.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/blkdev.h> |
| 26 | #include <linux/major.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/hdreg.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 29 | #include <linux/slab.h> |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 30 | #include <scsi/scsi.h> |
| 31 | #include <scsi/scsi_cmnd.h> |
| 32 | #include <scsi/scsi_eh.h> |
| 33 | #include <scsi/scsi_dbg.h> |
K. Y. Srinivasan | 3f335ea | 2011-05-12 19:34:15 -0700 | [diff] [blame] | 34 | |
| 35 | #include "hyperv.h" |
K. Y. Srinivasan | cdee150 | 2011-05-12 19:34:34 -0700 | [diff] [blame] | 36 | #include "hyperv_storage.h" |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 37 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 38 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 39 | #define BLKVSC_MINORS 64 |
| 40 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 41 | enum blkvsc_device_type { |
| 42 | UNKNOWN_DEV_TYPE, |
| 43 | HARDDISK_TYPE, |
| 44 | DVD_TYPE, |
| 45 | }; |
| 46 | |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 47 | enum blkvsc_op_type { |
| 48 | DO_INQUIRY, |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 49 | DO_CAPACITY, |
K. Y. Srinivasan | 26a1973 | 2011-04-22 14:55:11 -0700 | [diff] [blame] | 50 | DO_FLUSH, |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 51 | }; |
| 52 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 53 | /* |
| 54 | * This request ties the struct request and struct |
Nicolas Palix | 0b3f683 | 2009-07-29 14:10:19 +0200 | [diff] [blame] | 55 | * blkvsc_request/hv_storvsc_request together A struct request may be |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 56 | * represented by 1 or more struct blkvsc_request |
| 57 | */ |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 58 | struct blkvsc_request_group { |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 59 | int outstanding; |
| 60 | int status; |
| 61 | struct list_head blkvsc_req_list; /* list of blkvsc_requests */ |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 62 | }; |
| 63 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 64 | struct blkvsc_request { |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 65 | /* blkvsc_request_group.blkvsc_req_list */ |
| 66 | struct list_head req_entry; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 67 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 68 | /* block_device_context.pending_list */ |
| 69 | struct list_head pend_entry; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 70 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 71 | /* This may be null if we generate a request internally */ |
| 72 | struct request *req; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 73 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 74 | struct block_device_context *dev; |
| 75 | |
| 76 | /* The group this request is part of. Maybe null */ |
| 77 | struct blkvsc_request_group *group; |
| 78 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 79 | int write; |
| 80 | sector_t sector_start; |
| 81 | unsigned long sector_count; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 82 | |
| 83 | unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; |
| 84 | unsigned char cmd_len; |
| 85 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
| 86 | |
Nicolas Palix | 0b3f683 | 2009-07-29 14:10:19 +0200 | [diff] [blame] | 87 | struct hv_storvsc_request request; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 88 | }; |
| 89 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 90 | /* Per device structure */ |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 91 | struct block_device_context { |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 92 | /* point back to our device context */ |
K. Y. Srinivasan | 6bad88d | 2011-03-07 13:35:48 -0800 | [diff] [blame] | 93 | struct hv_device *device_ctx; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 94 | struct kmem_cache *request_pool; |
| 95 | spinlock_t lock; |
| 96 | struct gendisk *gd; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 97 | enum blkvsc_device_type device_type; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 98 | struct list_head pending_list; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 99 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 100 | unsigned char device_id[64]; |
| 101 | unsigned int device_id_len; |
| 102 | int num_outstanding_reqs; |
| 103 | int shutting_down; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 104 | unsigned int sector_size; |
| 105 | sector_t capacity; |
| 106 | unsigned int port; |
| 107 | unsigned char path; |
| 108 | unsigned char target; |
| 109 | int users; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 110 | }; |
| 111 | |
K. Y. Srinivasan | 5e9fed1 | 2011-05-10 07:53:50 -0700 | [diff] [blame] | 112 | static const char *drv_name = "blkvsc"; |
K. Y. Srinivasan | 19b5931 | 2011-03-23 10:50:28 -0700 | [diff] [blame] | 113 | |
K. Y. Srinivasan | 8f8e57a | 2011-04-22 14:13:34 -0700 | [diff] [blame] | 114 | /* |
| 115 | * There is a circular dependency involving blkvsc_request_completion() |
| 116 | * and blkvsc_do_request(). |
| 117 | */ |
| 118 | static void blkvsc_request_completion(struct hv_storvsc_request *request); |
| 119 | |
K. Y. Srinivasan | f84044d | 2011-04-22 14:13:37 -0700 | [diff] [blame] | 120 | static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE; |
| 121 | |
K. Y. Srinivasan | 369cb5c | 2011-04-22 14:13:38 -0700 | [diff] [blame] | 122 | module_param(blkvsc_ringbuffer_size, int, S_IRUGO); |
| 123 | MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)"); |
| 124 | |
K. Y. Srinivasan | f84044d | 2011-04-22 14:13:37 -0700 | [diff] [blame] | 125 | /* |
| 126 | * There is a circular dependency involving blkvsc_probe() |
| 127 | * and block_ops. |
| 128 | */ |
K. Y. Srinivasan | 9efd21e | 2011-04-29 13:45:10 -0700 | [diff] [blame] | 129 | static int blkvsc_probe(struct hv_device *dev); |
K. Y. Srinivasan | f84044d | 2011-04-22 14:13:37 -0700 | [diff] [blame] | 130 | |
K. Y. Srinivasan | 34d620d | 2011-05-10 07:53:55 -0700 | [diff] [blame] | 131 | static int blkvsc_device_add(struct hv_device *device, |
K. Y. Srinivasan | 19b5931 | 2011-03-23 10:50:28 -0700 | [diff] [blame] | 132 | void *additional_info) |
| 133 | { |
| 134 | struct storvsc_device_info *device_info; |
| 135 | int ret = 0; |
| 136 | |
| 137 | device_info = (struct storvsc_device_info *)additional_info; |
| 138 | |
K. Y. Srinivasan | fa4d123 | 2011-05-10 07:56:01 -0700 | [diff] [blame] | 139 | device_info->ring_buffer_size = blkvsc_ringbuffer_size; |
| 140 | |
K. Y. Srinivasan | 2ac5dad | 2011-05-10 07:53:57 -0700 | [diff] [blame] | 141 | ret = storvsc_dev_add(device, additional_info); |
K. Y. Srinivasan | 19b5931 | 2011-03-23 10:50:28 -0700 | [diff] [blame] | 142 | if (ret != 0) |
| 143 | return ret; |
| 144 | |
| 145 | /* |
| 146 | * We need to use the device instance guid to set the path and target |
| 147 | * id. For IDE devices, the device instance id is formatted as |
| 148 | * <bus id> * - <device id> - 8899 - 000000000000. |
| 149 | */ |
K. Y. Srinivasan | 358d2ee | 2011-08-25 09:48:28 -0700 | [diff] [blame] | 150 | device_info->path_id = device->dev_instance.b[3] << 24 | |
| 151 | device->dev_instance.b[2] << 16 | |
| 152 | device->dev_instance.b[1] << 8 | |
| 153 | device->dev_instance.b[0]; |
K. Y. Srinivasan | 19b5931 | 2011-03-23 10:50:28 -0700 | [diff] [blame] | 154 | |
K. Y. Srinivasan | 358d2ee | 2011-08-25 09:48:28 -0700 | [diff] [blame] | 155 | device_info->target_id = device->dev_instance.b[5] << 8 | |
| 156 | device->dev_instance.b[4]; |
K. Y. Srinivasan | 19b5931 | 2011-03-23 10:50:28 -0700 | [diff] [blame] | 157 | |
| 158 | return ret; |
| 159 | } |
| 160 | |
K. Y. Srinivasan | 8cbe3a1 | 2011-04-06 14:34:59 -0700 | [diff] [blame] | 161 | static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, |
| 162 | void (*request_completion)(struct hv_storvsc_request *)) |
| 163 | { |
| 164 | struct block_device_context *blkdev = blkvsc_req->dev; |
K. Y. Srinivasan | 8cbe3a1 | 2011-04-06 14:34:59 -0700 | [diff] [blame] | 165 | struct hv_storvsc_request *storvsc_req; |
| 166 | struct vmscsi_request *vm_srb; |
| 167 | int ret; |
| 168 | |
K. Y. Srinivasan | 8cbe3a1 | 2011-04-06 14:34:59 -0700 | [diff] [blame] | 169 | |
| 170 | storvsc_req = &blkvsc_req->request; |
| 171 | vm_srb = &storvsc_req->vstor_packet.vm_srb; |
| 172 | |
| 173 | vm_srb->data_in = blkvsc_req->write ? WRITE_TYPE : READ_TYPE; |
| 174 | |
| 175 | storvsc_req->on_io_completion = request_completion; |
| 176 | storvsc_req->context = blkvsc_req; |
| 177 | |
| 178 | vm_srb->port_number = blkdev->port; |
| 179 | vm_srb->path_id = blkdev->path; |
| 180 | vm_srb->target_id = blkdev->target; |
| 181 | vm_srb->lun = 0; /* this is not really used at all */ |
| 182 | |
| 183 | vm_srb->cdb_length = blkvsc_req->cmd_len; |
| 184 | |
| 185 | memcpy(vm_srb->cdb, blkvsc_req->cmnd, vm_srb->cdb_length); |
| 186 | |
| 187 | storvsc_req->sense_buffer = blkvsc_req->sense_buffer; |
| 188 | |
K. Y. Srinivasan | 7b31779 | 2011-05-10 07:54:03 -0700 | [diff] [blame] | 189 | ret = storvsc_do_io(blkdev->device_ctx, |
K. Y. Srinivasan | 8cbe3a1 | 2011-04-06 14:34:59 -0700 | [diff] [blame] | 190 | &blkvsc_req->request); |
| 191 | if (ret == 0) |
| 192 | blkdev->num_outstanding_reqs++; |
| 193 | |
| 194 | return ret; |
| 195 | } |
| 196 | |
| 197 | |
K. Y. Srinivasan | a55af7b | 2011-04-06 14:35:01 -0700 | [diff] [blame] | 198 | static int blkvsc_open(struct block_device *bdev, fmode_t mode) |
| 199 | { |
| 200 | struct block_device_context *blkdev = bdev->bd_disk->private_data; |
K. Y. Srinivasan | 6b73e4c | 2011-05-10 07:53:48 -0700 | [diff] [blame] | 201 | unsigned long flags; |
K. Y. Srinivasan | a55af7b | 2011-04-06 14:35:01 -0700 | [diff] [blame] | 202 | |
K. Y. Srinivasan | 6b73e4c | 2011-05-10 07:53:48 -0700 | [diff] [blame] | 203 | spin_lock_irqsave(&blkdev->lock, flags); |
K. Y. Srinivasan | a55af7b | 2011-04-06 14:35:01 -0700 | [diff] [blame] | 204 | |
K. Y. Srinivasan | a55af7b | 2011-04-06 14:35:01 -0700 | [diff] [blame] | 205 | blkdev->users++; |
| 206 | |
K. Y. Srinivasan | 6b73e4c | 2011-05-10 07:53:48 -0700 | [diff] [blame] | 207 | spin_unlock_irqrestore(&blkdev->lock, flags); |
K. Y. Srinivasan | c4c58c5 | 2011-04-22 14:55:22 -0700 | [diff] [blame] | 208 | |
K. Y. Srinivasan | a55af7b | 2011-04-06 14:35:01 -0700 | [diff] [blame] | 209 | return 0; |
| 210 | } |
| 211 | |
K. Y. Srinivasan | 273083b | 2011-04-06 14:35:02 -0700 | [diff] [blame] | 212 | |
| 213 | static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) |
| 214 | { |
K. Y. Srinivasan | ea50245 | 2011-04-22 14:55:07 -0700 | [diff] [blame] | 215 | sector_t nsect = get_capacity(bd->bd_disk); |
| 216 | sector_t cylinders = nsect; |
K. Y. Srinivasan | 273083b | 2011-04-06 14:35:02 -0700 | [diff] [blame] | 217 | |
K. Y. Srinivasan | ea50245 | 2011-04-22 14:55:07 -0700 | [diff] [blame] | 218 | /* |
| 219 | * We are making up these values; let us keep it simple. |
| 220 | */ |
| 221 | hg->heads = 0xff; |
| 222 | hg->sectors = 0x3f; |
| 223 | sector_div(cylinders, hg->heads * hg->sectors); |
K. Y. Srinivasan | 273083b | 2011-04-06 14:35:02 -0700 | [diff] [blame] | 224 | hg->cylinders = cylinders; |
K. Y. Srinivasan | ea50245 | 2011-04-22 14:55:07 -0700 | [diff] [blame] | 225 | if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect) |
| 226 | hg->cylinders = 0xffff; |
K. Y. Srinivasan | 273083b | 2011-04-06 14:35:02 -0700 | [diff] [blame] | 227 | return 0; |
K. Y. Srinivasan | ea50245 | 2011-04-22 14:55:07 -0700 | [diff] [blame] | 228 | |
K. Y. Srinivasan | 273083b | 2011-04-06 14:35:02 -0700 | [diff] [blame] | 229 | } |
| 230 | |
K. Y. Srinivasan | b7be09c | 2011-04-22 14:13:22 -0700 | [diff] [blame] | 231 | |
| 232 | static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req) |
| 233 | { |
K. Y. Srinivasan | b7be09c | 2011-04-22 14:13:22 -0700 | [diff] [blame] | 234 | |
| 235 | blkvsc_req->cmd_len = 16; |
| 236 | |
K. Y. Srinivasan | 9bd0859 | 2011-04-22 14:55:14 -0700 | [diff] [blame] | 237 | if (rq_data_dir(blkvsc_req->req)) { |
| 238 | blkvsc_req->write = 1; |
| 239 | blkvsc_req->cmnd[0] = WRITE_16; |
K. Y. Srinivasan | b7be09c | 2011-04-22 14:13:22 -0700 | [diff] [blame] | 240 | } else { |
K. Y. Srinivasan | 9bd0859 | 2011-04-22 14:55:14 -0700 | [diff] [blame] | 241 | blkvsc_req->write = 0; |
| 242 | blkvsc_req->cmnd[0] = READ_16; |
K. Y. Srinivasan | b7be09c | 2011-04-22 14:13:22 -0700 | [diff] [blame] | 243 | } |
K. Y. Srinivasan | 9bd0859 | 2011-04-22 14:55:14 -0700 | [diff] [blame] | 244 | |
| 245 | blkvsc_req->cmnd[1] |= |
| 246 | (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0; |
| 247 | |
| 248 | *(unsigned long long *)&blkvsc_req->cmnd[2] = |
| 249 | cpu_to_be64(blkvsc_req->sector_start); |
| 250 | *(unsigned int *)&blkvsc_req->cmnd[10] = |
| 251 | cpu_to_be32(blkvsc_req->sector_count); |
K. Y. Srinivasan | b7be09c | 2011-04-22 14:13:22 -0700 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | |
K. Y. Srinivasan | 7955344 | 2011-04-22 14:13:23 -0700 | [diff] [blame] | 255 | static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, |
K. Y. Srinivasan | 7b04cd0 | 2011-04-22 14:55:06 -0700 | [diff] [blame] | 256 | unsigned cmd, unsigned long arg) |
K. Y. Srinivasan | 7955344 | 2011-04-22 14:13:23 -0700 | [diff] [blame] | 257 | { |
K. Y. Srinivasan | 7b04cd0 | 2011-04-22 14:55:06 -0700 | [diff] [blame] | 258 | struct block_device_context *blkdev = bd->bd_disk->private_data; |
| 259 | int ret = 0; |
K. Y. Srinivasan | 7955344 | 2011-04-22 14:13:23 -0700 | [diff] [blame] | 260 | |
| 261 | switch (cmd) { |
K. Y. Srinivasan | 7955344 | 2011-04-22 14:13:23 -0700 | [diff] [blame] | 262 | case HDIO_GET_IDENTITY: |
K. Y. Srinivasan | 7955344 | 2011-04-22 14:13:23 -0700 | [diff] [blame] | 263 | if (copy_to_user((void __user *)arg, blkdev->device_id, |
| 264 | blkdev->device_id_len)) |
| 265 | ret = -EFAULT; |
| 266 | break; |
K. Y. Srinivasan | 7955344 | 2011-04-22 14:13:23 -0700 | [diff] [blame] | 267 | default: |
| 268 | ret = -EINVAL; |
| 269 | break; |
| 270 | } |
| 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
K. Y. Srinivasan | 795d30b | 2011-04-22 14:13:24 -0700 | [diff] [blame] | 275 | static void blkvsc_cmd_completion(struct hv_storvsc_request *request) |
| 276 | { |
| 277 | struct blkvsc_request *blkvsc_req = |
| 278 | (struct blkvsc_request *)request->context; |
| 279 | struct block_device_context *blkdev = |
| 280 | (struct block_device_context *)blkvsc_req->dev; |
| 281 | struct scsi_sense_hdr sense_hdr; |
| 282 | struct vmscsi_request *vm_srb; |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 283 | unsigned long flags; |
K. Y. Srinivasan | 795d30b | 2011-04-22 14:13:24 -0700 | [diff] [blame] | 284 | |
K. Y. Srinivasan | 795d30b | 2011-04-22 14:13:24 -0700 | [diff] [blame] | 285 | |
| 286 | vm_srb = &blkvsc_req->request.vstor_packet.vm_srb; |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 287 | |
| 288 | spin_lock_irqsave(&blkdev->lock, flags); |
K. Y. Srinivasan | 795d30b | 2011-04-22 14:13:24 -0700 | [diff] [blame] | 289 | blkdev->num_outstanding_reqs--; |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 290 | spin_unlock_irqrestore(&blkdev->lock, flags); |
K. Y. Srinivasan | 795d30b | 2011-04-22 14:13:24 -0700 | [diff] [blame] | 291 | |
| 292 | if (vm_srb->scsi_status) |
| 293 | if (scsi_normalize_sense(blkvsc_req->sense_buffer, |
| 294 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
| 295 | scsi_print_sense_hdr("blkvsc", &sense_hdr); |
| 296 | |
| 297 | complete(&blkvsc_req->request.wait_event); |
| 298 | } |
| 299 | |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 300 | |
| 301 | static int blkvsc_do_operation(struct block_device_context *blkdev, |
| 302 | enum blkvsc_op_type op) |
| 303 | { |
| 304 | struct blkvsc_request *blkvsc_req; |
| 305 | struct page *page_buf; |
| 306 | unsigned char *buf; |
| 307 | unsigned char device_type; |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 308 | struct scsi_sense_hdr sense_hdr; |
| 309 | struct vmscsi_request *vm_srb; |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 310 | unsigned long flags; |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 311 | |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 312 | int ret = 0; |
| 313 | |
| 314 | blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL); |
| 315 | if (!blkvsc_req) |
| 316 | return -ENOMEM; |
| 317 | |
| 318 | page_buf = alloc_page(GFP_KERNEL); |
| 319 | if (!page_buf) { |
Julia Lawall | fe3e593 | 2011-07-09 21:23:26 +0200 | [diff] [blame] | 320 | kmem_cache_free(blkdev->request_pool, blkvsc_req); |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 321 | return -ENOMEM; |
| 322 | } |
| 323 | |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 324 | vm_srb = &blkvsc_req->request.vstor_packet.vm_srb; |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 325 | init_completion(&blkvsc_req->request.wait_event); |
| 326 | blkvsc_req->dev = blkdev; |
| 327 | blkvsc_req->req = NULL; |
| 328 | blkvsc_req->write = 0; |
| 329 | |
| 330 | blkvsc_req->request.data_buffer.pfn_array[0] = |
| 331 | page_to_pfn(page_buf); |
| 332 | blkvsc_req->request.data_buffer.offset = 0; |
| 333 | |
| 334 | switch (op) { |
| 335 | case DO_INQUIRY: |
| 336 | blkvsc_req->cmnd[0] = INQUIRY; |
| 337 | blkvsc_req->cmnd[1] = 0x1; /* Get product data */ |
| 338 | blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */ |
| 339 | blkvsc_req->cmnd[4] = 64; |
| 340 | blkvsc_req->cmd_len = 6; |
| 341 | blkvsc_req->request.data_buffer.len = 64; |
| 342 | break; |
| 343 | |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 344 | case DO_CAPACITY: |
| 345 | blkdev->sector_size = 0; |
| 346 | blkdev->capacity = 0; |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 347 | |
| 348 | blkvsc_req->cmnd[0] = READ_CAPACITY; |
| 349 | blkvsc_req->cmd_len = 16; |
| 350 | blkvsc_req->request.data_buffer.len = 8; |
| 351 | break; |
K. Y. Srinivasan | 26a1973 | 2011-04-22 14:55:11 -0700 | [diff] [blame] | 352 | |
| 353 | case DO_FLUSH: |
| 354 | blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE; |
| 355 | blkvsc_req->cmd_len = 10; |
| 356 | blkvsc_req->request.data_buffer.pfn_array[0] = 0; |
| 357 | blkvsc_req->request.data_buffer.len = 0; |
| 358 | break; |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 359 | default: |
| 360 | ret = -EINVAL; |
| 361 | goto cleanup; |
| 362 | } |
| 363 | |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 364 | spin_lock_irqsave(&blkdev->lock, flags); |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 365 | blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 366 | spin_unlock_irqrestore(&blkdev->lock, flags); |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 367 | |
| 368 | wait_for_completion_interruptible(&blkvsc_req->request.wait_event); |
| 369 | |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 370 | /* check error */ |
| 371 | if (vm_srb->scsi_status) { |
| 372 | scsi_normalize_sense(blkvsc_req->sense_buffer, |
| 373 | SCSI_SENSE_BUFFERSIZE, &sense_hdr); |
| 374 | |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 375 | return 0; |
| 376 | } |
| 377 | |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 378 | buf = kmap(page_buf); |
| 379 | |
| 380 | switch (op) { |
| 381 | case DO_INQUIRY: |
| 382 | device_type = buf[0] & 0x1F; |
| 383 | |
| 384 | if (device_type == 0x0) |
| 385 | blkdev->device_type = HARDDISK_TYPE; |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 386 | else |
| 387 | blkdev->device_type = UNKNOWN_DEV_TYPE; |
| 388 | |
| 389 | blkdev->device_id_len = buf[7]; |
| 390 | if (blkdev->device_id_len > 64) |
| 391 | blkdev->device_id_len = 64; |
| 392 | |
| 393 | memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len); |
| 394 | break; |
K. Y. Srinivasan | 2038e21 | 2011-04-22 14:55:09 -0700 | [diff] [blame] | 395 | |
| 396 | case DO_CAPACITY: |
| 397 | /* be to le */ |
| 398 | blkdev->capacity = |
| 399 | ((buf[0] << 24) | (buf[1] << 16) | |
| 400 | (buf[2] << 8) | buf[3]) + 1; |
| 401 | |
| 402 | blkdev->sector_size = |
| 403 | (buf[4] << 24) | (buf[5] << 16) | |
| 404 | (buf[6] << 8) | buf[7]; |
| 405 | break; |
K. Y. Srinivasan | 26a1973 | 2011-04-22 14:55:11 -0700 | [diff] [blame] | 406 | default: |
| 407 | break; |
| 408 | |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | cleanup: |
| 412 | |
| 413 | kunmap(page_buf); |
| 414 | |
| 415 | __free_page(page_buf); |
| 416 | |
Julia Lawall | fe3e593 | 2011-07-09 21:23:26 +0200 | [diff] [blame] | 417 | kmem_cache_free(blkdev->request_pool, blkvsc_req); |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 418 | |
| 419 | return ret; |
| 420 | } |
| 421 | |
K. Y. Srinivasan | 795d30b | 2011-04-22 14:13:24 -0700 | [diff] [blame] | 422 | |
K. Y. Srinivasan | f60f213 | 2011-04-22 14:13:26 -0700 | [diff] [blame] | 423 | static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev) |
| 424 | { |
| 425 | struct blkvsc_request *pend_req, *tmp; |
| 426 | struct blkvsc_request *comp_req, *tmp2; |
| 427 | struct vmscsi_request *vm_srb; |
| 428 | |
| 429 | int ret = 0; |
| 430 | |
K. Y. Srinivasan | f60f213 | 2011-04-22 14:13:26 -0700 | [diff] [blame] | 431 | |
| 432 | /* Flush the pending list first */ |
| 433 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
| 434 | pend_entry) { |
| 435 | /* |
| 436 | * The pend_req could be part of a partially completed |
| 437 | * request. If so, complete those req first until we |
| 438 | * hit the pend_req |
| 439 | */ |
| 440 | list_for_each_entry_safe(comp_req, tmp2, |
| 441 | &pend_req->group->blkvsc_req_list, |
| 442 | req_entry) { |
K. Y. Srinivasan | f60f213 | 2011-04-22 14:13:26 -0700 | [diff] [blame] | 443 | |
| 444 | if (comp_req == pend_req) |
| 445 | break; |
| 446 | |
| 447 | list_del(&comp_req->req_entry); |
| 448 | |
| 449 | if (comp_req->req) { |
| 450 | vm_srb = |
| 451 | &comp_req->request.vstor_packet. |
| 452 | vm_srb; |
| 453 | ret = __blk_end_request(comp_req->req, |
| 454 | (!vm_srb->scsi_status ? 0 : -EIO), |
| 455 | comp_req->sector_count * |
| 456 | blkdev->sector_size); |
| 457 | |
| 458 | /* FIXME: shouldn't this do more than return? */ |
| 459 | if (ret) |
| 460 | goto out; |
| 461 | } |
| 462 | |
| 463 | kmem_cache_free(blkdev->request_pool, comp_req); |
| 464 | } |
| 465 | |
K. Y. Srinivasan | f60f213 | 2011-04-22 14:13:26 -0700 | [diff] [blame] | 466 | list_del(&pend_req->pend_entry); |
| 467 | |
| 468 | list_del(&pend_req->req_entry); |
| 469 | |
| 470 | if (comp_req->req) { |
| 471 | if (!__blk_end_request(pend_req->req, -EIO, |
| 472 | pend_req->sector_count * |
| 473 | blkdev->sector_size)) { |
| 474 | /* |
| 475 | * All the sectors have been xferred ie the |
| 476 | * request is done |
| 477 | */ |
K. Y. Srinivasan | f60f213 | 2011-04-22 14:13:26 -0700 | [diff] [blame] | 478 | kmem_cache_free(blkdev->request_pool, |
| 479 | pend_req->group); |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | kmem_cache_free(blkdev->request_pool, pend_req); |
| 484 | } |
| 485 | |
| 486 | out: |
| 487 | return ret; |
| 488 | } |
| 489 | |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 490 | |
| 491 | /* |
| 492 | * blkvsc_remove() - Callback when our device is removed |
| 493 | */ |
K. Y. Srinivasan | 415b023 | 2011-04-29 13:45:12 -0700 | [diff] [blame] | 494 | static int blkvsc_remove(struct hv_device *dev) |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 495 | { |
K. Y. Srinivasan | 415b023 | 2011-04-29 13:45:12 -0700 | [diff] [blame] | 496 | struct block_device_context *blkdev = dev_get_drvdata(&dev->device); |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 497 | unsigned long flags; |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 498 | |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 499 | |
| 500 | /* Get to a known state */ |
| 501 | spin_lock_irqsave(&blkdev->lock, flags); |
| 502 | |
| 503 | blkdev->shutting_down = 1; |
| 504 | |
| 505 | blk_stop_queue(blkdev->gd->queue); |
| 506 | |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 507 | blkvsc_cancel_pending_reqs(blkdev); |
| 508 | |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 509 | spin_unlock_irqrestore(&blkdev->lock, flags); |
| 510 | |
K. Y. Srinivasan | 26a1973 | 2011-04-22 14:55:11 -0700 | [diff] [blame] | 511 | blkvsc_do_operation(blkdev, DO_FLUSH); |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 512 | |
K. Y. Srinivasan | 3a45058 | 2011-06-06 15:49:43 -0700 | [diff] [blame] | 513 | if (blkdev->users == 0) { |
| 514 | del_gendisk(blkdev->gd); |
| 515 | put_disk(blkdev->gd); |
| 516 | blk_cleanup_queue(blkdev->gd->queue); |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 517 | |
K. Y. Srinivasan | 3a45058 | 2011-06-06 15:49:43 -0700 | [diff] [blame] | 518 | storvsc_dev_remove(blkdev->device_ctx); |
K. Y. Srinivasan | f670f82 | 2011-05-10 07:54:09 -0700 | [diff] [blame] | 519 | |
K. Y. Srinivasan | 3a45058 | 2011-06-06 15:49:43 -0700 | [diff] [blame] | 520 | kmem_cache_destroy(blkdev->request_pool); |
| 521 | kfree(blkdev); |
| 522 | } |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 523 | |
K. Y. Srinivasan | a31de96 | 2011-04-22 14:55:17 -0700 | [diff] [blame] | 524 | return 0; |
K. Y. Srinivasan | 8c09004 | 2011-04-22 14:13:27 -0700 | [diff] [blame] | 525 | } |
| 526 | |
K. Y. Srinivasan | ca6887f | 2011-04-29 13:45:14 -0700 | [diff] [blame] | 527 | static void blkvsc_shutdown(struct hv_device *dev) |
K. Y. Srinivasan | e82066b | 2011-04-22 14:13:28 -0700 | [diff] [blame] | 528 | { |
K. Y. Srinivasan | ca6887f | 2011-04-29 13:45:14 -0700 | [diff] [blame] | 529 | struct block_device_context *blkdev = dev_get_drvdata(&dev->device); |
K. Y. Srinivasan | e82066b | 2011-04-22 14:13:28 -0700 | [diff] [blame] | 530 | unsigned long flags; |
| 531 | |
| 532 | if (!blkdev) |
| 533 | return; |
| 534 | |
K. Y. Srinivasan | e82066b | 2011-04-22 14:13:28 -0700 | [diff] [blame] | 535 | spin_lock_irqsave(&blkdev->lock, flags); |
| 536 | |
| 537 | blkdev->shutting_down = 1; |
| 538 | |
| 539 | blk_stop_queue(blkdev->gd->queue); |
| 540 | |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 541 | blkvsc_cancel_pending_reqs(blkdev); |
| 542 | |
K. Y. Srinivasan | e82066b | 2011-04-22 14:13:28 -0700 | [diff] [blame] | 543 | spin_unlock_irqrestore(&blkdev->lock, flags); |
| 544 | |
K. Y. Srinivasan | 26a1973 | 2011-04-22 14:55:11 -0700 | [diff] [blame] | 545 | blkvsc_do_operation(blkdev, DO_FLUSH); |
K. Y. Srinivasan | e82066b | 2011-04-22 14:13:28 -0700 | [diff] [blame] | 546 | |
K. Y. Srinivasan | 149b119 | 2011-05-10 07:54:10 -0700 | [diff] [blame] | 547 | /* |
| 548 | * Now wait for all outgoing I/O to be drained. |
| 549 | */ |
| 550 | storvsc_wait_to_drain((struct storvsc_device *)dev->ext); |
| 551 | |
K. Y. Srinivasan | e82066b | 2011-04-22 14:13:28 -0700 | [diff] [blame] | 552 | } |
| 553 | |
K. Y. Srinivasan | 8138bd9 | 2011-04-22 14:13:29 -0700 | [diff] [blame] | 554 | static int blkvsc_release(struct gendisk *disk, fmode_t mode) |
| 555 | { |
| 556 | struct block_device_context *blkdev = disk->private_data; |
K. Y. Srinivasan | 6b73e4c | 2011-05-10 07:53:48 -0700 | [diff] [blame] | 557 | unsigned long flags; |
K. Y. Srinivasan | 8138bd9 | 2011-04-22 14:13:29 -0700 | [diff] [blame] | 558 | |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 559 | spin_lock_irqsave(&blkdev->lock, flags); |
K. Y. Srinivasan | 3a45058 | 2011-06-06 15:49:43 -0700 | [diff] [blame] | 560 | |
| 561 | if ((--blkdev->users == 0) && (blkdev->shutting_down)) { |
| 562 | blk_stop_queue(blkdev->gd->queue); |
| 563 | spin_unlock_irqrestore(&blkdev->lock, flags); |
| 564 | |
| 565 | blkvsc_do_operation(blkdev, DO_FLUSH); |
| 566 | del_gendisk(blkdev->gd); |
| 567 | put_disk(blkdev->gd); |
| 568 | blk_cleanup_queue(blkdev->gd->queue); |
| 569 | |
| 570 | storvsc_dev_remove(blkdev->device_ctx); |
| 571 | |
| 572 | kmem_cache_destroy(blkdev->request_pool); |
| 573 | kfree(blkdev); |
| 574 | } else |
| 575 | spin_unlock_irqrestore(&blkdev->lock, flags); |
K. Y. Srinivasan | 67de49c | 2011-05-10 07:53:49 -0700 | [diff] [blame] | 576 | |
K. Y. Srinivasan | 8138bd9 | 2011-04-22 14:13:29 -0700 | [diff] [blame] | 577 | return 0; |
| 578 | } |
| 579 | |
K. Y. Srinivasan | 87b31c2 | 2011-04-22 14:13:30 -0700 | [diff] [blame] | 580 | |
K. Y. Srinivasan | 8f8e57a | 2011-04-22 14:13:34 -0700 | [diff] [blame] | 581 | /* |
| 582 | * We break the request into 1 or more blkvsc_requests and submit |
| 583 | * them. If we cant submit them all, we put them on the |
| 584 | * pending_list. The blkvsc_request() will work on the pending_list. |
| 585 | */ |
| 586 | static int blkvsc_do_request(struct block_device_context *blkdev, |
| 587 | struct request *req) |
| 588 | { |
| 589 | struct bio *bio = NULL; |
| 590 | struct bio_vec *bvec = NULL; |
| 591 | struct bio_vec *prev_bvec = NULL; |
| 592 | struct blkvsc_request *blkvsc_req = NULL; |
| 593 | struct blkvsc_request *tmp; |
| 594 | int databuf_idx = 0; |
| 595 | int seg_idx = 0; |
| 596 | sector_t start_sector; |
| 597 | unsigned long num_sectors = 0; |
| 598 | int ret = 0; |
| 599 | int pending = 0; |
| 600 | struct blkvsc_request_group *group = NULL; |
| 601 | |
K. Y. Srinivasan | 8f8e57a | 2011-04-22 14:13:34 -0700 | [diff] [blame] | 602 | /* Create a group to tie req to list of blkvsc_reqs */ |
| 603 | group = kmem_cache_zalloc(blkdev->request_pool, GFP_ATOMIC); |
| 604 | if (!group) |
| 605 | return -ENOMEM; |
| 606 | |
| 607 | INIT_LIST_HEAD(&group->blkvsc_req_list); |
| 608 | group->outstanding = group->status = 0; |
| 609 | |
| 610 | start_sector = blk_rq_pos(req); |
| 611 | |
| 612 | /* foreach bio in the request */ |
| 613 | if (req->bio) { |
| 614 | for (bio = req->bio; bio; bio = bio->bi_next) { |
| 615 | /* |
| 616 | * Map this bio into an existing or new storvsc request |
| 617 | */ |
| 618 | bio_for_each_segment(bvec, bio, seg_idx) { |
K. Y. Srinivasan | 8f8e57a | 2011-04-22 14:13:34 -0700 | [diff] [blame] | 619 | /* Get a new storvsc request */ |
| 620 | /* 1st-time */ |
| 621 | if ((!blkvsc_req) || |
| 622 | (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) |
| 623 | /* hole at the begin of page */ |
| 624 | || (bvec->bv_offset != 0) || |
| 625 | /* hold at the end of page */ |
| 626 | (prev_bvec && |
| 627 | (prev_bvec->bv_len != PAGE_SIZE))) { |
| 628 | /* submit the prev one */ |
| 629 | if (blkvsc_req) { |
| 630 | blkvsc_req->sector_start = |
| 631 | start_sector; |
| 632 | sector_div( |
| 633 | blkvsc_req->sector_start, |
| 634 | (blkdev->sector_size >> 9)); |
| 635 | |
| 636 | blkvsc_req->sector_count = |
| 637 | num_sectors / |
| 638 | (blkdev->sector_size >> 9); |
| 639 | blkvsc_init_rw(blkvsc_req); |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Create new blkvsc_req to represent |
| 644 | * the current bvec |
| 645 | */ |
| 646 | blkvsc_req = |
| 647 | kmem_cache_zalloc( |
| 648 | blkdev->request_pool, GFP_ATOMIC); |
| 649 | if (!blkvsc_req) { |
| 650 | /* free up everything */ |
| 651 | list_for_each_entry_safe( |
| 652 | blkvsc_req, tmp, |
| 653 | &group->blkvsc_req_list, |
| 654 | req_entry) { |
| 655 | list_del( |
| 656 | &blkvsc_req->req_entry); |
| 657 | kmem_cache_free( |
| 658 | blkdev->request_pool, |
| 659 | blkvsc_req); |
| 660 | } |
| 661 | |
| 662 | kmem_cache_free( |
| 663 | blkdev->request_pool, group); |
| 664 | return -ENOMEM; |
| 665 | } |
| 666 | |
| 667 | memset(blkvsc_req, 0, |
| 668 | sizeof(struct blkvsc_request)); |
| 669 | |
| 670 | blkvsc_req->dev = blkdev; |
| 671 | blkvsc_req->req = req; |
| 672 | blkvsc_req->request. |
| 673 | data_buffer.offset |
| 674 | = bvec->bv_offset; |
| 675 | blkvsc_req->request. |
| 676 | data_buffer.len = 0; |
| 677 | |
| 678 | /* Add to the group */ |
| 679 | blkvsc_req->group = group; |
| 680 | blkvsc_req->group->outstanding++; |
| 681 | list_add_tail(&blkvsc_req->req_entry, |
| 682 | &blkvsc_req->group->blkvsc_req_list); |
| 683 | |
| 684 | start_sector += num_sectors; |
| 685 | num_sectors = 0; |
| 686 | databuf_idx = 0; |
| 687 | } |
| 688 | |
| 689 | /* |
| 690 | * Add the curr bvec/segment to the curr |
| 691 | * blkvsc_req |
| 692 | */ |
| 693 | blkvsc_req->request.data_buffer. |
| 694 | pfn_array[databuf_idx] |
| 695 | = page_to_pfn(bvec->bv_page); |
| 696 | blkvsc_req->request.data_buffer.len |
| 697 | += bvec->bv_len; |
| 698 | |
| 699 | prev_bvec = bvec; |
| 700 | |
| 701 | databuf_idx++; |
| 702 | num_sectors += bvec->bv_len >> 9; |
| 703 | |
| 704 | } /* bio_for_each_segment */ |
| 705 | |
| 706 | } /* rq_for_each_bio */ |
| 707 | } |
| 708 | |
| 709 | /* Handle the last one */ |
| 710 | if (blkvsc_req) { |
K. Y. Srinivasan | 8f8e57a | 2011-04-22 14:13:34 -0700 | [diff] [blame] | 711 | blkvsc_req->sector_start = start_sector; |
| 712 | sector_div(blkvsc_req->sector_start, |
| 713 | (blkdev->sector_size >> 9)); |
| 714 | |
| 715 | blkvsc_req->sector_count = num_sectors / |
| 716 | (blkdev->sector_size >> 9); |
| 717 | |
| 718 | blkvsc_init_rw(blkvsc_req); |
| 719 | } |
| 720 | |
| 721 | list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) { |
| 722 | if (pending) { |
K. Y. Srinivasan | 8f8e57a | 2011-04-22 14:13:34 -0700 | [diff] [blame] | 723 | |
| 724 | list_add_tail(&blkvsc_req->pend_entry, |
| 725 | &blkdev->pending_list); |
| 726 | } else { |
| 727 | ret = blkvsc_submit_request(blkvsc_req, |
| 728 | blkvsc_request_completion); |
| 729 | if (ret == -1) { |
| 730 | pending = 1; |
| 731 | list_add_tail(&blkvsc_req->pend_entry, |
| 732 | &blkdev->pending_list); |
| 733 | } |
| 734 | |
K. Y. Srinivasan | 8f8e57a | 2011-04-22 14:13:34 -0700 | [diff] [blame] | 735 | } |
| 736 | } |
| 737 | |
| 738 | return pending; |
| 739 | } |
| 740 | |
K. Y. Srinivasan | 76abfaa | 2011-04-22 14:13:35 -0700 | [diff] [blame] | 741 | static int blkvsc_do_pending_reqs(struct block_device_context *blkdev) |
| 742 | { |
| 743 | struct blkvsc_request *pend_req, *tmp; |
| 744 | int ret = 0; |
| 745 | |
| 746 | /* Flush the pending list first */ |
| 747 | list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, |
| 748 | pend_entry) { |
K. Y. Srinivasan | 76abfaa | 2011-04-22 14:13:35 -0700 | [diff] [blame] | 749 | |
| 750 | ret = blkvsc_submit_request(pend_req, |
| 751 | blkvsc_request_completion); |
| 752 | if (ret != 0) |
| 753 | break; |
| 754 | else |
| 755 | list_del(&pend_req->pend_entry); |
| 756 | } |
| 757 | |
| 758 | return ret; |
| 759 | } |
| 760 | |
K. Y. Srinivasan | 1efe705 | 2011-04-22 14:13:36 -0700 | [diff] [blame] | 761 | |
| 762 | static void blkvsc_request(struct request_queue *queue) |
| 763 | { |
| 764 | struct block_device_context *blkdev = NULL; |
| 765 | struct request *req; |
| 766 | int ret = 0; |
| 767 | |
K. Y. Srinivasan | 1efe705 | 2011-04-22 14:13:36 -0700 | [diff] [blame] | 768 | while ((req = blk_peek_request(queue)) != NULL) { |
K. Y. Srinivasan | 1efe705 | 2011-04-22 14:13:36 -0700 | [diff] [blame] | 769 | |
| 770 | blkdev = req->rq_disk->private_data; |
K. Y. Srinivasan | aac7af6 | 2011-04-22 14:55:12 -0700 | [diff] [blame] | 771 | if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS) { |
K. Y. Srinivasan | 1efe705 | 2011-04-22 14:13:36 -0700 | [diff] [blame] | 772 | __blk_end_request_cur(req, 0); |
| 773 | continue; |
| 774 | } |
| 775 | |
| 776 | ret = blkvsc_do_pending_reqs(blkdev); |
| 777 | |
| 778 | if (ret != 0) { |
K. Y. Srinivasan | 1efe705 | 2011-04-22 14:13:36 -0700 | [diff] [blame] | 779 | blk_stop_queue(queue); |
| 780 | break; |
| 781 | } |
| 782 | |
| 783 | blk_start_request(req); |
| 784 | |
| 785 | ret = blkvsc_do_request(blkdev, req); |
| 786 | if (ret > 0) { |
K. Y. Srinivasan | 1efe705 | 2011-04-22 14:13:36 -0700 | [diff] [blame] | 787 | blk_stop_queue(queue); |
| 788 | break; |
| 789 | } else if (ret < 0) { |
K. Y. Srinivasan | 1efe705 | 2011-04-22 14:13:36 -0700 | [diff] [blame] | 790 | blk_requeue_request(queue, req); |
| 791 | blk_stop_queue(queue); |
| 792 | break; |
| 793 | } |
| 794 | } |
| 795 | } |
| 796 | |
K. Y. Srinivasan | eefd7f4 | 2011-08-25 09:48:32 -0700 | [diff] [blame] | 797 | static const struct hv_vmbus_device_id id_table[] = { |
| 798 | { |
| 799 | /* IDE guid */ |
| 800 | .guid = { |
| 801 | 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, |
| 802 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5 |
| 803 | } |
| 804 | }, |
| 805 | { |
| 806 | .guid = { } |
| 807 | }, |
| 808 | }; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 809 | |
K. Y. Srinivasan | eefd7f4 | 2011-08-25 09:48:32 -0700 | [diff] [blame] | 810 | MODULE_DEVICE_TABLE(vmbus, id_table); |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 811 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 812 | /* The one and only one */ |
K. Y. Srinivasan | 428faae | 2011-05-10 07:56:10 -0700 | [diff] [blame] | 813 | static struct hv_driver blkvsc_drv = { |
K. Y. Srinivasan | eefd7f4 | 2011-08-25 09:48:32 -0700 | [diff] [blame] | 814 | .id_table = id_table, |
K. Y. Srinivasan | 428faae | 2011-05-10 07:56:10 -0700 | [diff] [blame] | 815 | .probe = blkvsc_probe, |
| 816 | .remove = blkvsc_remove, |
| 817 | .shutdown = blkvsc_shutdown, |
K. Y. Srinivasan | 7e7f0c5 | 2011-05-10 07:54:04 -0700 | [diff] [blame] | 818 | }; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 819 | |
Stephen Hemminger | 48c9f7c | 2010-05-06 21:44:44 -0700 | [diff] [blame] | 820 | static const struct block_device_operations block_ops = { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 821 | .owner = THIS_MODULE, |
| 822 | .open = blkvsc_open, |
| 823 | .release = blkvsc_release, |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 824 | .getgeo = blkvsc_getgeo, |
| 825 | .ioctl = blkvsc_ioctl, |
| 826 | }; |
| 827 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 828 | /* |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 829 | * blkvsc_drv_init - BlkVsc driver initialization. |
| 830 | */ |
K. Y. Srinivasan | 834702f | 2011-03-23 10:50:30 -0700 | [diff] [blame] | 831 | static int blkvsc_drv_init(void) |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 832 | { |
K. Y. Srinivasan | 428faae | 2011-05-10 07:56:10 -0700 | [diff] [blame] | 833 | struct hv_driver *drv = &blkvsc_drv; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 834 | int ret; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 835 | |
K. Y. Srinivasan | 3e32649 | 2011-05-10 07:55:55 -0700 | [diff] [blame] | 836 | BUILD_BUG_ON(sizeof(sector_t) != 8); |
| 837 | |
K. Y. Srinivasan | 5457c71 | 2011-05-10 07:55:51 -0700 | [diff] [blame] | 838 | drv->driver.name = drv_name; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 839 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 840 | /* The driver belongs to vmbus */ |
K. Y. Srinivasan | 150f939 | 2011-03-07 13:32:31 -0800 | [diff] [blame] | 841 | ret = vmbus_child_driver_register(&drv->driver); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 842 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 843 | return ret; |
| 844 | } |
| 845 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 846 | |
Greg Kroah-Hartman | bd1de70 | 2009-07-29 09:04:51 -0700 | [diff] [blame] | 847 | static void blkvsc_drv_exit(void) |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 848 | { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 849 | |
K. Y. Srinivasan | 8553d75 | 2011-05-12 19:34:44 -0700 | [diff] [blame] | 850 | vmbus_child_driver_unregister(&blkvsc_drv.driver); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 851 | } |
| 852 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 853 | /* |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 854 | * blkvsc_probe - Add a new device for this driver |
| 855 | */ |
K. Y. Srinivasan | 9efd21e | 2011-04-29 13:45:10 -0700 | [diff] [blame] | 856 | static int blkvsc_probe(struct hv_device *dev) |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 857 | { |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 858 | struct block_device_context *blkdev = NULL; |
Greg Kroah-Hartman | 9f0c7d2 | 2009-08-28 16:20:07 -0700 | [diff] [blame] | 859 | struct storvsc_device_info device_info; |
K. Y. Srinivasan | e46ee8e | 2011-04-22 14:55:26 -0700 | [diff] [blame] | 860 | struct storvsc_major_info major_info; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 861 | int ret = 0; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 862 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 863 | blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL); |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 864 | if (!blkdev) { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 865 | ret = -ENOMEM; |
K. Y. Srinivasan | d87d707 | 2011-04-22 14:55:23 -0700 | [diff] [blame] | 866 | goto cleanup; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 867 | } |
| 868 | |
| 869 | INIT_LIST_HEAD(&blkdev->pending_list); |
| 870 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 871 | /* Initialize what we can here */ |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 872 | spin_lock_init(&blkdev->lock); |
| 873 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 874 | |
K. Y. Srinivasan | 9efd21e | 2011-04-29 13:45:10 -0700 | [diff] [blame] | 875 | blkdev->request_pool = kmem_cache_create(dev_name(&dev->device), |
K. Y. Srinivasan | 1e05d88 | 2011-03-28 09:33:28 -0700 | [diff] [blame] | 876 | sizeof(struct blkvsc_request), 0, |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 877 | SLAB_HWCACHE_ALIGN, NULL); |
| 878 | if (!blkdev->request_pool) { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 879 | ret = -ENOMEM; |
K. Y. Srinivasan | d87d707 | 2011-04-22 14:55:23 -0700 | [diff] [blame] | 880 | goto cleanup; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 881 | } |
| 882 | |
| 883 | |
K. Y. Srinivasan | 0d44f5b | 2011-05-10 07:53:56 -0700 | [diff] [blame] | 884 | ret = blkvsc_device_add(dev, &device_info); |
K. Y. Srinivasan | e01c33b | 2011-04-22 14:55:20 -0700 | [diff] [blame] | 885 | if (ret != 0) |
K. Y. Srinivasan | d87d707 | 2011-04-22 14:55:23 -0700 | [diff] [blame] | 886 | goto cleanup; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 887 | |
K. Y. Srinivasan | 9efd21e | 2011-04-29 13:45:10 -0700 | [diff] [blame] | 888 | blkdev->device_ctx = dev; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 889 | /* this identified the device 0 or 1 */ |
Hank Janssen | 8a04602 | 2010-12-06 12:26:45 -0800 | [diff] [blame] | 890 | blkdev->target = device_info.target_id; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 891 | /* this identified the ide ctrl 0 or 1 */ |
Hank Janssen | 8a04602 | 2010-12-06 12:26:45 -0800 | [diff] [blame] | 892 | blkdev->path = device_info.path_id; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 893 | |
K. Y. Srinivasan | 9efd21e | 2011-04-29 13:45:10 -0700 | [diff] [blame] | 894 | dev_set_drvdata(&dev->device, blkdev); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 895 | |
K. Y. Srinivasan | 43c51f7 | 2011-05-10 07:54:06 -0700 | [diff] [blame] | 896 | ret = storvsc_get_major_info(&device_info, &major_info); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 897 | |
K. Y. Srinivasan | e46ee8e | 2011-04-22 14:55:26 -0700 | [diff] [blame] | 898 | if (ret) |
K. Y. Srinivasan | d87d707 | 2011-04-22 14:55:23 -0700 | [diff] [blame] | 899 | goto cleanup; |
K. Y. Srinivasan | e46ee8e | 2011-04-22 14:55:26 -0700 | [diff] [blame] | 900 | |
| 901 | if (major_info.do_register) { |
| 902 | ret = register_blkdev(major_info.major, major_info.devname); |
| 903 | |
| 904 | if (ret != 0) { |
| 905 | DPRINT_ERR(BLKVSC_DRV, |
| 906 | "register_blkdev() failed! ret %d", ret); |
| 907 | goto remove; |
| 908 | } |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 909 | } |
| 910 | |
K. Y. Srinivasan | e46ee8e | 2011-04-22 14:55:26 -0700 | [diff] [blame] | 911 | DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", |
| 912 | major_info.major); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 913 | |
| 914 | blkdev->gd = alloc_disk(BLKVSC_MINORS); |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 915 | if (!blkdev->gd) { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 916 | ret = -1; |
K. Y. Srinivasan | d87d707 | 2011-04-22 14:55:23 -0700 | [diff] [blame] | 917 | goto cleanup; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock); |
| 921 | |
| 922 | blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE); |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 923 | blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 924 | blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1); |
| 925 | blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY); |
| 926 | blk_queue_dma_alignment(blkdev->gd->queue, 511); |
| 927 | |
K. Y. Srinivasan | e46ee8e | 2011-04-22 14:55:26 -0700 | [diff] [blame] | 928 | blkdev->gd->major = major_info.major; |
| 929 | if (major_info.index == 1 || major_info.index == 3) |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 930 | blkdev->gd->first_minor = BLKVSC_MINORS; |
| 931 | else |
| 932 | blkdev->gd->first_minor = 0; |
| 933 | blkdev->gd->fops = &block_ops; |
| 934 | blkdev->gd->private_data = blkdev; |
Ky Srinivasan | 268eff9 | 2010-12-16 18:59:19 -0700 | [diff] [blame] | 935 | blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device); |
K. Y. Srinivasan | e46ee8e | 2011-04-22 14:55:26 -0700 | [diff] [blame] | 936 | sprintf(blkdev->gd->disk_name, "hd%c", 'a' + major_info.index); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 937 | |
K. Y. Srinivasan | 2ede209 | 2011-04-22 14:55:08 -0700 | [diff] [blame] | 938 | blkvsc_do_operation(blkdev, DO_INQUIRY); |
K. Y. Srinivasan | d491982 | 2011-04-22 14:55:19 -0700 | [diff] [blame] | 939 | blkvsc_do_operation(blkdev, DO_CAPACITY); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 940 | |
| 941 | set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); |
Greg Kroah-Hartman | 0fce4c2 | 2009-07-14 10:24:38 -0700 | [diff] [blame] | 942 | blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size); |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 943 | /* go! */ |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 944 | add_disk(blkdev->gd); |
| 945 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 946 | DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d", |
| 947 | blkdev->gd->disk_name, (unsigned long)blkdev->capacity, |
| 948 | blkdev->sector_size); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 949 | |
| 950 | return ret; |
| 951 | |
K. Y. Srinivasan | 487ae7c | 2011-04-22 14:55:24 -0700 | [diff] [blame] | 952 | remove: |
K. Y. Srinivasan | 3530ef3 | 2011-05-10 07:53:59 -0700 | [diff] [blame] | 953 | storvsc_dev_remove(dev); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 954 | |
K. Y. Srinivasan | d87d707 | 2011-04-22 14:55:23 -0700 | [diff] [blame] | 955 | cleanup: |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 956 | if (blkdev) { |
| 957 | if (blkdev->request_pool) { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 958 | kmem_cache_destroy(blkdev->request_pool); |
| 959 | blkdev->request_pool = NULL; |
| 960 | } |
| 961 | kfree(blkdev); |
| 962 | blkdev = NULL; |
| 963 | } |
| 964 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 965 | return ret; |
| 966 | } |
| 967 | |
Nicolas Palix | 0b3f683 | 2009-07-29 14:10:19 +0200 | [diff] [blame] | 968 | static void blkvsc_request_completion(struct hv_storvsc_request *request) |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 969 | { |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 970 | struct blkvsc_request *blkvsc_req = |
K. Y. Srinivasan | d7a1bdb | 2011-03-28 09:33:44 -0700 | [diff] [blame] | 971 | (struct blkvsc_request *)request->context; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 972 | struct block_device_context *blkdev = |
| 973 | (struct block_device_context *)blkvsc_req->dev; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 974 | unsigned long flags; |
| 975 | struct blkvsc_request *comp_req, *tmp; |
K. Y. Srinivasan | 6dc3f0a | 2011-03-28 09:33:42 -0700 | [diff] [blame] | 976 | struct vmscsi_request *vm_srb; |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 977 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 978 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 979 | spin_lock_irqsave(&blkdev->lock, flags); |
| 980 | |
| 981 | blkdev->num_outstanding_reqs--; |
| 982 | blkvsc_req->group->outstanding--; |
| 983 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 984 | /* |
| 985 | * Only start processing when all the blkvsc_reqs are |
| 986 | * completed. This guarantees no out-of-order blkvsc_req |
| 987 | * completion when calling end_that_request_first() |
| 988 | */ |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 989 | if (blkvsc_req->group->outstanding == 0) { |
| 990 | list_for_each_entry_safe(comp_req, tmp, |
| 991 | &blkvsc_req->group->blkvsc_req_list, |
| 992 | req_entry) { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 993 | |
| 994 | list_del(&comp_req->req_entry); |
| 995 | |
K. Y. Srinivasan | 6dc3f0a | 2011-03-28 09:33:42 -0700 | [diff] [blame] | 996 | vm_srb = |
K. Y. Srinivasan | d7a1bdb | 2011-03-28 09:33:44 -0700 | [diff] [blame] | 997 | &comp_req->request.vstor_packet.vm_srb; |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 998 | if (!__blk_end_request(comp_req->req, |
K. Y. Srinivasan | 6dc3f0a | 2011-03-28 09:33:42 -0700 | [diff] [blame] | 999 | (!vm_srb->scsi_status ? 0 : -EIO), |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 1000 | comp_req->sector_count * blkdev->sector_size)) { |
| 1001 | /* |
| 1002 | * All the sectors have been xferred ie the |
| 1003 | * request is done |
| 1004 | */ |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 1005 | kmem_cache_free(blkdev->request_pool, |
| 1006 | comp_req->group); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1007 | } |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1008 | |
| 1009 | kmem_cache_free(blkdev->request_pool, comp_req); |
| 1010 | } |
| 1011 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 1012 | if (!blkdev->shutting_down) { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1013 | blkvsc_do_pending_reqs(blkdev); |
| 1014 | blk_start_queue(blkdev->gd->queue); |
| 1015 | blkvsc_request(blkdev->gd->queue); |
| 1016 | } |
| 1017 | } |
| 1018 | |
| 1019 | spin_unlock_irqrestore(&blkdev->lock, flags); |
| 1020 | } |
| 1021 | |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1022 | static void __exit blkvsc_exit(void) |
| 1023 | { |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1024 | blkvsc_drv_exit(); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1025 | } |
| 1026 | |
Greg Kroah-Hartman | 8a28039 | 2009-09-01 16:34:56 -0700 | [diff] [blame] | 1027 | MODULE_LICENSE("GPL"); |
Hank Janssen | 26c14cc | 2010-02-11 23:02:42 +0000 | [diff] [blame] | 1028 | MODULE_VERSION(HV_DRV_VERSION); |
Stephen Hemminger | 1ec28ab | 2010-05-06 21:44:43 -0700 | [diff] [blame] | 1029 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver"); |
K. Y. Srinivasan | 154a61c | 2011-05-10 07:55:56 -0700 | [diff] [blame] | 1030 | module_init(blkvsc_drv_init); |
Hank Janssen | f82bd04 | 2009-07-13 15:33:02 -0700 | [diff] [blame] | 1031 | module_exit(blkvsc_exit); |