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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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027b180d74
As described in https://bugzilla.kernel.org/show_bug.cgi?id=19922 : I had an AoE device go down overnight, and while a server was trying to : write to it, it was also writing this message to its logs: : : 209 printk(KERN_INFO "aoe: device %ld.%d is not up\n", : 210 d->aoemajor, d->aoeminor); : : The message appeared many times per second, and over several hours : produced about 7.5 gigabytes of log files, filling up all free space on : the root filesystem. Cc: "Ed L. Cashin" <ecashin@coraid.com> Suggested-by: Roman Mamedov <roman@rm.pp.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
336 lines
7.6 KiB
C
336 lines
7.6 KiB
C
/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
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/*
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* aoeblk.c
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* block device routines
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*/
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#include <linux/kernel.h>
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#include <linux/hdreg.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/fs.h>
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#include <linux/ioctl.h>
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#include <linux/slab.h>
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#include <linux/ratelimit.h>
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#include <linux/genhd.h>
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#include <linux/netdevice.h>
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#include <linux/mutex.h>
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#include "aoe.h"
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static DEFINE_MUTEX(aoeblk_mutex);
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static struct kmem_cache *buf_pool_cache;
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static ssize_t aoedisk_show_state(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct gendisk *disk = dev_to_disk(dev);
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struct aoedev *d = disk->private_data;
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return snprintf(page, PAGE_SIZE,
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"%s%s\n",
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(d->flags & DEVFL_UP) ? "up" : "down",
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(d->flags & DEVFL_KICKME) ? ",kickme" :
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(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
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/* I'd rather see nopen exported so we can ditch closewait */
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}
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static ssize_t aoedisk_show_mac(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct gendisk *disk = dev_to_disk(dev);
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struct aoedev *d = disk->private_data;
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struct aoetgt *t = d->targets[0];
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if (t == NULL)
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return snprintf(page, PAGE_SIZE, "none\n");
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return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
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}
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static ssize_t aoedisk_show_netif(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct gendisk *disk = dev_to_disk(dev);
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struct aoedev *d = disk->private_data;
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struct net_device *nds[8], **nd, **nnd, **ne;
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struct aoetgt **t, **te;
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struct aoeif *ifp, *e;
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char *p;
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memset(nds, 0, sizeof nds);
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nd = nds;
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ne = nd + ARRAY_SIZE(nds);
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t = d->targets;
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te = t + NTARGETS;
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for (; t < te && *t; t++) {
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ifp = (*t)->ifs;
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e = ifp + NAOEIFS;
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for (; ifp < e && ifp->nd; ifp++) {
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for (nnd = nds; nnd < nd; nnd++)
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if (*nnd == ifp->nd)
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break;
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if (nnd == nd && nd != ne)
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*nd++ = ifp->nd;
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}
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}
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ne = nd;
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nd = nds;
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if (*nd == NULL)
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return snprintf(page, PAGE_SIZE, "none\n");
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for (p = page; nd < ne; nd++)
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p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
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p == page ? "" : ",", (*nd)->name);
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p += snprintf(p, PAGE_SIZE - (p-page), "\n");
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return p-page;
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}
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/* firmware version */
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static ssize_t aoedisk_show_fwver(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct gendisk *disk = dev_to_disk(dev);
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struct aoedev *d = disk->private_data;
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return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
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}
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static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
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static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
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static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
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static struct device_attribute dev_attr_firmware_version = {
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.attr = { .name = "firmware-version", .mode = S_IRUGO },
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.show = aoedisk_show_fwver,
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};
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static struct attribute *aoe_attrs[] = {
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&dev_attr_state.attr,
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&dev_attr_mac.attr,
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&dev_attr_netif.attr,
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&dev_attr_firmware_version.attr,
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NULL,
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};
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static const struct attribute_group attr_group = {
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.attrs = aoe_attrs,
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};
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static int
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aoedisk_add_sysfs(struct aoedev *d)
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{
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return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
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}
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void
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aoedisk_rm_sysfs(struct aoedev *d)
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{
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sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
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}
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static int
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aoeblk_open(struct block_device *bdev, fmode_t mode)
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{
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struct aoedev *d = bdev->bd_disk->private_data;
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ulong flags;
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mutex_lock(&aoeblk_mutex);
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spin_lock_irqsave(&d->lock, flags);
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if (d->flags & DEVFL_UP) {
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d->nopen++;
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spin_unlock_irqrestore(&d->lock, flags);
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mutex_unlock(&aoeblk_mutex);
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return 0;
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}
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spin_unlock_irqrestore(&d->lock, flags);
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mutex_unlock(&aoeblk_mutex);
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return -ENODEV;
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}
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static int
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aoeblk_release(struct gendisk *disk, fmode_t mode)
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{
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struct aoedev *d = disk->private_data;
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ulong flags;
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spin_lock_irqsave(&d->lock, flags);
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if (--d->nopen == 0) {
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spin_unlock_irqrestore(&d->lock, flags);
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aoecmd_cfg(d->aoemajor, d->aoeminor);
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return 0;
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}
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spin_unlock_irqrestore(&d->lock, flags);
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return 0;
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}
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static int
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aoeblk_make_request(struct request_queue *q, struct bio *bio)
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{
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struct sk_buff_head queue;
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struct aoedev *d;
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struct buf *buf;
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ulong flags;
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blk_queue_bounce(q, &bio);
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if (bio == NULL) {
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printk(KERN_ERR "aoe: bio is NULL\n");
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BUG();
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return 0;
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}
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d = bio->bi_bdev->bd_disk->private_data;
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if (d == NULL) {
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printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
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BUG();
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bio_endio(bio, -ENXIO);
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return 0;
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} else if (bio->bi_rw & REQ_HARDBARRIER) {
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bio_endio(bio, -EOPNOTSUPP);
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return 0;
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} else if (bio->bi_io_vec == NULL) {
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printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
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BUG();
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bio_endio(bio, -ENXIO);
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return 0;
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}
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buf = mempool_alloc(d->bufpool, GFP_NOIO);
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if (buf == NULL) {
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printk(KERN_INFO "aoe: buf allocation failure\n");
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bio_endio(bio, -ENOMEM);
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return 0;
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}
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memset(buf, 0, sizeof(*buf));
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INIT_LIST_HEAD(&buf->bufs);
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buf->stime = jiffies;
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buf->bio = bio;
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buf->resid = bio->bi_size;
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buf->sector = bio->bi_sector;
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buf->bv = &bio->bi_io_vec[bio->bi_idx];
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buf->bv_resid = buf->bv->bv_len;
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WARN_ON(buf->bv_resid == 0);
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buf->bv_off = buf->bv->bv_offset;
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spin_lock_irqsave(&d->lock, flags);
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if ((d->flags & DEVFL_UP) == 0) {
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pr_info_ratelimited("aoe: device %ld.%d is not up\n",
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d->aoemajor, d->aoeminor);
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spin_unlock_irqrestore(&d->lock, flags);
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mempool_free(buf, d->bufpool);
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bio_endio(bio, -ENXIO);
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return 0;
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}
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list_add_tail(&buf->bufs, &d->bufq);
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aoecmd_work(d);
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__skb_queue_head_init(&queue);
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skb_queue_splice_init(&d->sendq, &queue);
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spin_unlock_irqrestore(&d->lock, flags);
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aoenet_xmit(&queue);
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return 0;
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}
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static int
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aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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{
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struct aoedev *d = bdev->bd_disk->private_data;
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if ((d->flags & DEVFL_UP) == 0) {
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printk(KERN_ERR "aoe: disk not up\n");
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return -ENODEV;
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}
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geo->cylinders = d->geo.cylinders;
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geo->heads = d->geo.heads;
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geo->sectors = d->geo.sectors;
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return 0;
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}
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static const struct block_device_operations aoe_bdops = {
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.open = aoeblk_open,
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.release = aoeblk_release,
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.getgeo = aoeblk_getgeo,
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.owner = THIS_MODULE,
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};
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/* alloc_disk and add_disk can sleep */
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void
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aoeblk_gdalloc(void *vp)
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{
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struct aoedev *d = vp;
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struct gendisk *gd;
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ulong flags;
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gd = alloc_disk(AOE_PARTITIONS);
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if (gd == NULL) {
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printk(KERN_ERR
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"aoe: cannot allocate disk structure for %ld.%d\n",
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d->aoemajor, d->aoeminor);
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goto err;
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}
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d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
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if (d->bufpool == NULL) {
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printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
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d->aoemajor, d->aoeminor);
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goto err_disk;
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}
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d->blkq = blk_alloc_queue(GFP_KERNEL);
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if (!d->blkq)
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goto err_mempool;
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blk_queue_make_request(d->blkq, aoeblk_make_request);
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d->blkq->backing_dev_info.name = "aoe";
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if (bdi_init(&d->blkq->backing_dev_info))
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goto err_blkq;
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spin_lock_irqsave(&d->lock, flags);
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gd->major = AOE_MAJOR;
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gd->first_minor = d->sysminor * AOE_PARTITIONS;
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gd->fops = &aoe_bdops;
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gd->private_data = d;
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set_capacity(gd, d->ssize);
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snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
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d->aoemajor, d->aoeminor);
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gd->queue = d->blkq;
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d->gd = gd;
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d->flags &= ~DEVFL_GDALLOC;
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d->flags |= DEVFL_UP;
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spin_unlock_irqrestore(&d->lock, flags);
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add_disk(gd);
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aoedisk_add_sysfs(d);
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return;
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err_blkq:
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blk_cleanup_queue(d->blkq);
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d->blkq = NULL;
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err_mempool:
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mempool_destroy(d->bufpool);
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err_disk:
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put_disk(gd);
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err:
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spin_lock_irqsave(&d->lock, flags);
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d->flags &= ~DEVFL_GDALLOC;
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spin_unlock_irqrestore(&d->lock, flags);
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}
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void
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aoeblk_exit(void)
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{
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kmem_cache_destroy(buf_pool_cache);
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}
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int __init
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aoeblk_init(void)
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{
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buf_pool_cache = kmem_cache_create("aoe_bufs",
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sizeof(struct buf),
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0, 0, NULL);
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if (buf_pool_cache == NULL)
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return -ENOMEM;
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return 0;
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}
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