aoeblk.c revision 2611464d7f36685fb1990275d3de1e72e6aff9d9
1/* Copyright (c) 2006 Coraid, Inc. See COPYING for GPL terms. */ 2/* 3 * aoeblk.c 4 * block device routines 5 */ 6 7#include <linux/hdreg.h> 8#include <linux/blkdev.h> 9#include <linux/fs.h> 10#include <linux/ioctl.h> 11#include <linux/genhd.h> 12#include <linux/netdevice.h> 13#include "aoe.h" 14 15static kmem_cache_t *buf_pool_cache; 16 17/* add attributes for our block devices in sysfs */ 18static ssize_t aoedisk_show_state(struct gendisk * disk, char *page) 19{ 20 struct aoedev *d = disk->private_data; 21 22 return snprintf(page, PAGE_SIZE, 23 "%s%s\n", 24 (d->flags & DEVFL_UP) ? "up" : "down", 25 (d->flags & DEVFL_PAUSE) ? ",paused" : 26 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); 27 /* I'd rather see nopen exported so we can ditch closewait */ 28} 29static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page) 30{ 31 struct aoedev *d = disk->private_data; 32 33 return snprintf(page, PAGE_SIZE, "%012llx\n", 34 (unsigned long long)mac_addr(d->addr)); 35} 36static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page) 37{ 38 struct aoedev *d = disk->private_data; 39 40 return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name); 41} 42/* firmware version */ 43static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page) 44{ 45 struct aoedev *d = disk->private_data; 46 47 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); 48} 49 50static struct disk_attribute disk_attr_state = { 51 .attr = {.name = "state", .mode = S_IRUGO }, 52 .show = aoedisk_show_state 53}; 54static struct disk_attribute disk_attr_mac = { 55 .attr = {.name = "mac", .mode = S_IRUGO }, 56 .show = aoedisk_show_mac 57}; 58static struct disk_attribute disk_attr_netif = { 59 .attr = {.name = "netif", .mode = S_IRUGO }, 60 .show = aoedisk_show_netif 61}; 62static struct disk_attribute disk_attr_fwver = { 63 .attr = {.name = "firmware-version", .mode = S_IRUGO }, 64 .show = aoedisk_show_fwver 65}; 66 67static void 68aoedisk_add_sysfs(struct aoedev *d) 69{ 70 sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr); 71 sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr); 72 sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr); 73 sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr); 74} 75void 76aoedisk_rm_sysfs(struct aoedev *d) 77{ 78 sysfs_remove_link(&d->gd->kobj, "state"); 79 sysfs_remove_link(&d->gd->kobj, "mac"); 80 sysfs_remove_link(&d->gd->kobj, "netif"); 81 sysfs_remove_link(&d->gd->kobj, "firmware-version"); 82} 83 84static int 85aoeblk_open(struct inode *inode, struct file *filp) 86{ 87 struct aoedev *d; 88 ulong flags; 89 90 d = inode->i_bdev->bd_disk->private_data; 91 92 spin_lock_irqsave(&d->lock, flags); 93 if (d->flags & DEVFL_UP) { 94 d->nopen++; 95 spin_unlock_irqrestore(&d->lock, flags); 96 return 0; 97 } 98 spin_unlock_irqrestore(&d->lock, flags); 99 return -ENODEV; 100} 101 102static int 103aoeblk_release(struct inode *inode, struct file *filp) 104{ 105 struct aoedev *d; 106 ulong flags; 107 108 d = inode->i_bdev->bd_disk->private_data; 109 110 spin_lock_irqsave(&d->lock, flags); 111 112 if (--d->nopen == 0) { 113 spin_unlock_irqrestore(&d->lock, flags); 114 aoecmd_cfg(d->aoemajor, d->aoeminor); 115 return 0; 116 } 117 spin_unlock_irqrestore(&d->lock, flags); 118 119 return 0; 120} 121 122static int 123aoeblk_make_request(request_queue_t *q, struct bio *bio) 124{ 125 struct aoedev *d; 126 struct buf *buf; 127 struct sk_buff *sl; 128 ulong flags; 129 130 blk_queue_bounce(q, &bio); 131 132 d = bio->bi_bdev->bd_disk->private_data; 133 buf = mempool_alloc(d->bufpool, GFP_NOIO); 134 if (buf == NULL) { 135 printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation " 136 "failure\n"); 137 bio_endio(bio, bio->bi_size, -ENOMEM); 138 return 0; 139 } 140 memset(buf, 0, sizeof(*buf)); 141 INIT_LIST_HEAD(&buf->bufs); 142 buf->start_time = jiffies; 143 buf->bio = bio; 144 buf->resid = bio->bi_size; 145 buf->sector = bio->bi_sector; 146 buf->bv = buf->bio->bi_io_vec; 147 buf->bv_resid = buf->bv->bv_len; 148 buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset; 149 150 spin_lock_irqsave(&d->lock, flags); 151 152 if ((d->flags & DEVFL_UP) == 0) { 153 printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n", 154 d->aoemajor, d->aoeminor); 155 spin_unlock_irqrestore(&d->lock, flags); 156 mempool_free(buf, d->bufpool); 157 bio_endio(bio, bio->bi_size, -ENXIO); 158 return 0; 159 } 160 161 list_add_tail(&buf->bufs, &d->bufq); 162 163 aoecmd_work(d); 164 sl = d->sendq_hd; 165 d->sendq_hd = d->sendq_tl = NULL; 166 167 spin_unlock_irqrestore(&d->lock, flags); 168 aoenet_xmit(sl); 169 170 return 0; 171} 172 173static int 174aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 175{ 176 struct aoedev *d = bdev->bd_disk->private_data; 177 178 if ((d->flags & DEVFL_UP) == 0) { 179 printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n"); 180 return -ENODEV; 181 } 182 183 geo->cylinders = d->geo.cylinders; 184 geo->heads = d->geo.heads; 185 geo->sectors = d->geo.sectors; 186 return 0; 187} 188 189static struct block_device_operations aoe_bdops = { 190 .open = aoeblk_open, 191 .release = aoeblk_release, 192 .getgeo = aoeblk_getgeo, 193 .owner = THIS_MODULE, 194}; 195 196/* alloc_disk and add_disk can sleep */ 197void 198aoeblk_gdalloc(void *vp) 199{ 200 struct aoedev *d = vp; 201 struct gendisk *gd; 202 ulong flags; 203 204 gd = alloc_disk(AOE_PARTITIONS); 205 if (gd == NULL) { 206 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk " 207 "structure for %ld.%ld\n", d->aoemajor, d->aoeminor); 208 spin_lock_irqsave(&d->lock, flags); 209 d->flags &= ~DEVFL_GDALLOC; 210 spin_unlock_irqrestore(&d->lock, flags); 211 return; 212 } 213 214 d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache); 215 if (d->bufpool == NULL) { 216 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool " 217 "for %ld.%ld\n", d->aoemajor, d->aoeminor); 218 put_disk(gd); 219 spin_lock_irqsave(&d->lock, flags); 220 d->flags &= ~DEVFL_GDALLOC; 221 spin_unlock_irqrestore(&d->lock, flags); 222 return; 223 } 224 225 spin_lock_irqsave(&d->lock, flags); 226 blk_queue_make_request(&d->blkq, aoeblk_make_request); 227 gd->major = AOE_MAJOR; 228 gd->first_minor = d->sysminor * AOE_PARTITIONS; 229 gd->fops = &aoe_bdops; 230 gd->private_data = d; 231 gd->capacity = d->ssize; 232 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld", 233 d->aoemajor, d->aoeminor); 234 235 gd->queue = &d->blkq; 236 d->gd = gd; 237 d->flags &= ~DEVFL_GDALLOC; 238 d->flags |= DEVFL_UP; 239 240 spin_unlock_irqrestore(&d->lock, flags); 241 242 add_disk(gd); 243 aoedisk_add_sysfs(d); 244} 245 246void 247aoeblk_exit(void) 248{ 249 kmem_cache_destroy(buf_pool_cache); 250} 251 252int __init 253aoeblk_init(void) 254{ 255 buf_pool_cache = kmem_cache_create("aoe_bufs", 256 sizeof(struct buf), 257 0, 0, NULL, NULL); 258 if (buf_pool_cache == NULL) 259 return -ENOMEM; 260 261 return 0; 262} 263 264