5 files changed, 220 insertions, 97 deletions

diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index 881c48d941b7..bb7dd91e5d48 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -75,8 +75,9 @@ enum {
         DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
         DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
         DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
-        DEVFL_WC_UPDATE = (1<<4), /* this device needs to update write cache status */
-        DEVFL_WORKON = (1<<4),
+        DEVFL_GDALLOC = (1<<4), /* need to alloc gendisk */
+        DEVFL_PAUSE = (1<<5),
+        DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
 
         BUFFL_FAIL = 1,
 };
@@ -152,16 +153,17 @@ void aoechr_exit(void);
 void aoechr_error(char *);
 
 void aoecmd_work(struct aoedev *d);
-void aoecmd_cfg(ushort, unsigned char);
+void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 void aoecmd_ata_rsp(struct sk_buff *);
 void aoecmd_cfg_rsp(struct sk_buff *);
+void aoecmd_sleepwork(void *vp);
 
 int aoedev_init(void);
 void aoedev_exit(void);
 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
+struct aoedev *aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt);
 void aoedev_downdev(struct aoedev *d);
-struct aoedev *aoedev_set(ulong, unsigned char *, struct net_device *, ulong);
-int aoedev_busy(void);
+int aoedev_isbusy(struct aoedev *d);
 
 int aoenet_init(void);
 void aoenet_exit(void);
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index c05ee8bffd97..039c0911fa8f 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -22,7 +22,9 @@ static ssize_t aoedisk_show_state(struct gendisk * disk, char *page)
         return snprintf(page, PAGE_SIZE,
                         "%s%s\n",
                         (d->flags & DEVFL_UP) ? "up" : "down",
-                        (d->flags & DEVFL_CLOSEWAIT) ? ",closewait" : "");
+                        (d->flags & DEVFL_PAUSE) ? ",paused" :
+                        (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
+        /* I'd rather see nopen exported so we can ditch closewait */
 }
 static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
 {
@@ -107,8 +109,7 @@ aoeblk_release(struct inode *inode, struct file *filp)
 
         spin_lock_irqsave(&d->lock, flags);
 
-        if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) {
-                d->flags &= ~DEVFL_CLOSEWAIT;
+        if (--d->nopen == 0 && !(d->flags & DEVFL_UP)) {
                 spin_unlock_irqrestore(&d->lock, flags);
                 aoecmd_cfg(d->aoemajor, d->aoeminor);
                 return 0;
@@ -158,14 +159,14 @@ aoeblk_make_request(request_queue_t *q, struct bio *bio)
         }
 
         list_add_tail(&buf->bufs, &d->bufq);
-        aoecmd_work(d);
 
+        aoecmd_work(d);
         sl = d->sendq_hd;
         d->sendq_hd = d->sendq_tl = NULL;
 
         spin_unlock_irqrestore(&d->lock, flags);
-
         aoenet_xmit(sl);
+
         return 0;
 }
 
@@ -205,7 +206,7 @@ aoeblk_gdalloc(void *vp)
                 printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk "
                         "structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
                 spin_lock_irqsave(&d->lock, flags);
-                d->flags &= ~DEVFL_WORKON;
+                d->flags &= ~DEVFL_GDALLOC;
                 spin_unlock_irqrestore(&d->lock, flags);
                 return;
         }
@@ -218,7 +219,7 @@ aoeblk_gdalloc(void *vp)
                         "for %ld.%ld\n", d->aoemajor, d->aoeminor);
                 put_disk(gd);
                 spin_lock_irqsave(&d->lock, flags);
-                d->flags &= ~DEVFL_WORKON;
+                d->flags &= ~DEVFL_GDALLOC;
                 spin_unlock_irqrestore(&d->lock, flags);
                 return;
         }
@@ -235,18 +236,13 @@ aoeblk_gdalloc(void *vp)
 
         gd->queue = &d->blkq;
         d->gd = gd;
-        d->flags &= ~DEVFL_WORKON;
+        d->flags &= ~DEVFL_GDALLOC;
         d->flags |= DEVFL_UP;
 
         spin_unlock_irqrestore(&d->lock, flags);
 
         add_disk(gd);
         aoedisk_add_sysfs(d);
-        
-        printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
-                "sectors\n", (unsigned long long)mac_addr(d->addr),
-                d->aoemajor, d->aoeminor,
-                d->fw_ver, (long long)d->ssize);
 }
 
 void
diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index 41ae0ede619a..5327f553b4f5 100644
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -13,6 +13,7 @@ enum {
         MINOR_ERR = 2,
         MINOR_DISCOVER,
         MINOR_INTERFACES,
+        MINOR_REVALIDATE,
         MSGSZ = 2048,
         NARGS = 10,
         NMSG = 100,             /* message backlog to retain */
@@ -41,6 +42,7 @@ static struct aoe_chardev chardevs[] = {
         { MINOR_ERR, "err" },
         { MINOR_DISCOVER, "discover" },
         { MINOR_INTERFACES, "interfaces" },
+        { MINOR_REVALIDATE, "revalidate" },
 };
 
 static int
@@ -62,6 +64,39 @@ interfaces(const char __user *str, size_t size)
         return 0;
 }
 
+static int
+revalidate(const char __user *str, size_t size)
+{
+        int major, minor, n;
+        ulong flags;
+        struct aoedev *d;
+        char buf[16];
+
+        if (size >= sizeof buf)
+                return -EINVAL;
+        buf[sizeof buf - 1] = '\0';
+        if (copy_from_user(buf, str, size))
+                return -EFAULT;
+
+        /* should be e%d.%d format */
+        n = sscanf(buf, "e%d.%d", &major, &minor);
+        if (n != 2) {
+                printk(KERN_ERR "aoe: %s: invalid device specification\n",
+                        __FUNCTION__);
+                return -EINVAL;
+        }
+        d = aoedev_by_aoeaddr(major, minor);
+        if (!d)
+                return -EINVAL;
+
+        spin_lock_irqsave(&d->lock, flags);
+        d->flags |= DEVFL_PAUSE;
+        spin_unlock_irqrestore(&d->lock, flags);
+        aoecmd_cfg(major, minor);
+
+        return 0;
+}
+
 void
 aoechr_error(char *msg)
 {
@@ -114,6 +149,8 @@ aoechr_write(struct file *filp, const char __user *buf, size_t cnt, loff_t *offp
         case MINOR_INTERFACES:
                 ret = interfaces(buf, cnt);
                 break;
+        case MINOR_REVALIDATE:
+                ret = revalidate(buf, cnt);
         }
         if (ret == 0)
                 ret = cnt;
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 4ab01ce5cf36..150eb78cd5a9 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -8,6 +8,7 @@
 #include <linux/blkdev.h>
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
+#include <linux/genhd.h>
 #include <asm/unaligned.h>
 #include "aoe.h"
 
@@ -189,12 +190,67 @@ aoecmd_ata_rw(struct aoedev *d, struct frame *f)
         }
 }
 
+/* some callers cannot sleep, and they can call this function,
+ * transmitting the packets later, when interrupts are on
+ */
+static struct sk_buff *
+aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff **tail)
+{
+        struct aoe_hdr *h;
+        struct aoe_cfghdr *ch;
+        struct sk_buff *skb, *sl, *sl_tail;
+        struct net_device *ifp;
+
+        sl = sl_tail = NULL;
+
+        read_lock(&dev_base_lock);
+        for (ifp = dev_base; ifp; dev_put(ifp), ifp = ifp->next) {
+                dev_hold(ifp);
+                if (!is_aoe_netif(ifp))
+                        continue;
+
+                skb = new_skb(ifp, sizeof *h + sizeof *ch);
+                if (skb == NULL) {
+                        printk(KERN_INFO "aoe: aoecmd_cfg: skb alloc failure\n");
+                        continue;
+                }
+                if (sl_tail == NULL)
+                        sl_tail = skb;
+                h = (struct aoe_hdr *) skb->mac.raw;
+                memset(h, 0, sizeof *h + sizeof *ch);
+
+                memset(h->dst, 0xff, sizeof h->dst);
+                memcpy(h->src, ifp->dev_addr, sizeof h->src);
+                h->type = __constant_cpu_to_be16(ETH_P_AOE);
+                h->verfl = AOE_HVER;
+                h->major = cpu_to_be16(aoemajor);
+                h->minor = aoeminor;
+                h->cmd = AOECMD_CFG;
+
+                skb->next = sl;
+                sl = skb;
+        }
+        read_unlock(&dev_base_lock);
+
+        if (tail != NULL)
+                *tail = sl_tail;
+        return sl;
+}
+
 /* enters with d->lock held */
 void
 aoecmd_work(struct aoedev *d)
 {
         struct frame *f;
         struct buf *buf;
+
+        if (d->flags & DEVFL_PAUSE) {
+                if (!aoedev_isbusy(d))
+                        d->sendq_hd = aoecmd_cfg_pkts(d->aoemajor,
+                                                d->aoeminor, &d->sendq_tl);
+                return;
+        }
+
 loop:
         f = getframe(d, FREETAG);
         if (f == NULL)
@@ -306,6 +362,37 @@ tdie:		spin_unlock_irqrestore(&d->lock, flags);
         aoenet_xmit(sl);
 }
 
+/* this function performs work that has been deferred until sleeping is OK
+ */
+void
+aoecmd_sleepwork(void *vp)
+{
+        struct aoedev *d = (struct aoedev *) vp;
+
+        if (d->flags & DEVFL_GDALLOC)
+                aoeblk_gdalloc(d);
+
+        if (d->flags & DEVFL_NEWSIZE) {
+                struct block_device *bd;
+                unsigned long flags;
+                u64 ssize;
+
+                ssize = d->gd->capacity;
+                bd = bdget_disk(d->gd, 0);
+
+                if (bd) {
+                        mutex_lock(&bd->bd_inode->i_mutex);
+                        i_size_write(bd->bd_inode, (loff_t)ssize<<9);
+                        mutex_unlock(&bd->bd_inode->i_mutex);
+                        bdput(bd);
+                }
+                spin_lock_irqsave(&d->lock, flags);
+                d->flags |= DEVFL_UP;
+                d->flags &= ~DEVFL_NEWSIZE;
+                spin_unlock_irqrestore(&d->lock, flags);
+        }
+}
+
 static void
 ataid_complete(struct aoedev *d, unsigned char *id)
 {
@@ -340,21 +427,29 @@ ataid_complete(struct aoedev *d, unsigned char *id)
                 d->geo.heads = le16_to_cpu(get_unaligned((__le16 *) &id[55<<1]));
                 d->geo.sectors = le16_to_cpu(get_unaligned((__le16 *) &id[56<<1]));
         }
+
+        if (d->ssize != ssize)
+                printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
+                        "sectors\n", (unsigned long long)mac_addr(d->addr),
+                        d->aoemajor, d->aoeminor,
+                        d->fw_ver, (long long)ssize);
         d->ssize = ssize;
         d->geo.start = 0;
         if (d->gd != NULL) {
                 d->gd->capacity = ssize;
-                d->flags |= DEVFL_UP;
-                return;
-        }
-        if (d->flags & DEVFL_WORKON) {
-                printk(KERN_INFO "aoe: ataid_complete: can't schedule work, it's already on!  "
-                        "(This really shouldn't happen).\n");
-                return;
+                d->flags |= DEVFL_NEWSIZE;
+        } else {
+                if (d->flags & DEVFL_GDALLOC) {
+                        printk(KERN_INFO "aoe: %s: %s e%lu.%lu, %s\n",
+                               __FUNCTION__,
+                               "can't schedule work for",
+                               d->aoemajor, d->aoeminor,
+                               "it's already on! (This really shouldn't happen).\n");
+                        return;
+                }
+                d->flags |= DEVFL_GDALLOC;
         }
-        INIT_WORK(&d->work, aoeblk_gdalloc, d);
         schedule_work(&d->work);
-        d->flags |= DEVFL_WORKON;
 }
 
 static void
@@ -452,7 +547,7 @@ aoecmd_ata_rsp(struct sk_buff *skb)
                                 return;
                         }
                         ataid_complete(d, (char *) (ahin+1));
-                        /* d->flags |= DEVFL_WC_UPDATE; */
+                        d->flags &= ~DEVFL_PAUSE;
                         break;
                 default:
                         printk(KERN_INFO "aoe: aoecmd_ata_rsp: unrecognized "
@@ -485,51 +580,19 @@ aoecmd_ata_rsp(struct sk_buff *skb)
         f->tag = FREETAG;
 
         aoecmd_work(d);
-
         sl = d->sendq_hd;
         d->sendq_hd = d->sendq_tl = NULL;
 
         spin_unlock_irqrestore(&d->lock, flags);
-
         aoenet_xmit(sl);
 }
 
 void
 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
 {
-        struct aoe_hdr *h;
-        struct aoe_cfghdr *ch;
-        struct sk_buff *skb, *sl;
-        struct net_device *ifp;
-
-        sl = NULL;
-
-        read_lock(&dev_base_lock);
-        for (ifp = dev_base; ifp; dev_put(ifp), ifp = ifp->next) {
-                dev_hold(ifp);
-                if (!is_aoe_netif(ifp))
-                        continue;
-
-                skb = new_skb(ifp, sizeof *h + sizeof *ch);
-                if (skb == NULL) {
-                        printk(KERN_INFO "aoe: aoecmd_cfg: skb alloc failure\n");
-                        continue;
-                }
-                h = (struct aoe_hdr *) skb->mac.raw;
-                memset(h, 0, sizeof *h + sizeof *ch);
-
-                memset(h->dst, 0xff, sizeof h->dst);
-                memcpy(h->src, ifp->dev_addr, sizeof h->src);
-                h->type = __constant_cpu_to_be16(ETH_P_AOE);
-                h->verfl = AOE_HVER;
-                h->major = cpu_to_be16(aoemajor);
-                h->minor = aoeminor;
-                h->cmd = AOECMD_CFG;
+        struct sk_buff *sl;
 
-                skb->next = sl;
-                sl = skb;
-        }
-        read_unlock(&dev_base_lock);
+        sl = aoecmd_cfg_pkts(aoemajor, aoeminor, NULL);
 
         aoenet_xmit(sl);
 }
@@ -562,9 +625,6 @@ aoecmd_ata_id(struct aoedev *d)
         f->waited = 0;
         f->writedatalen = 0;
 
-        /* this message initializes the device, so we reset the rttavg */
-        d->rttavg = MAXTIMER;
-
         /* set up ata header */
         ah->scnt = 1;
         ah->cmdstat = WIN_IDENTIFY;
@@ -572,12 +632,8 @@ aoecmd_ata_id(struct aoedev *d)
 
         skb = skb_prepare(d, f);
 
-        /* we now want to start the rexmit tracking */
-        d->flags &= ~DEVFL_TKILL;
-        d->timer.data = (ulong) d;
+        d->rttavg = MAXTIMER;
         d->timer.function = rexmit_timer;
-        d->timer.expires = jiffies + TIMERTICK;
-        add_timer(&d->timer);
 
         return skb;
 }
@@ -619,23 +675,28 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
         if (bufcnt > MAXFRAMES) /* keep it reasonable */
                 bufcnt = MAXFRAMES;
 
-        d = aoedev_set(sysminor, h->src, skb->dev, bufcnt);
+        d = aoedev_by_sysminor_m(sysminor, bufcnt);
         if (d == NULL) {
-                printk(KERN_INFO "aoe: aoecmd_cfg_rsp: device set failure\n");
+                printk(KERN_INFO "aoe: aoecmd_cfg_rsp: device sysminor_m failure\n");
                 return;
         }
 
         spin_lock_irqsave(&d->lock, flags);
 
-        if (d->flags & (DEVFL_UP | DEVFL_CLOSEWAIT)) {
+        /* permit device to migrate mac and network interface */
+        d->ifp = skb->dev;
+        memcpy(d->addr, h->src, sizeof d->addr);
+
+        /* don't change users' perspective */
+        if (d->nopen && !(d->flags & DEVFL_PAUSE)) {
                 spin_unlock_irqrestore(&d->lock, flags);
                 return;
         }
-
+        d->flags |= DEVFL_PAUSE;        /* force pause */
         d->fw_ver = be16_to_cpu(ch->fwver);
 
-        /* we get here only if the device is new */
-        sl = aoecmd_ata_id(d);
+        /* check for already outstanding ataid */
+        sl = aoedev_isbusy(d) == 0 ? aoecmd_ata_id(d) : NULL;
 
         spin_unlock_irqrestore(&d->lock, flags);
 
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index ded33ba31acc..ed4258a62df5 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -12,6 +12,24 @@
 static struct aoedev *devlist;
 static spinlock_t devlist_lock;
 
+int
+aoedev_isbusy(struct aoedev *d)
+{
+        struct frame *f, *e;
+
+        f = d->frames;
+        e = f + d->nframes;
+        do {
+                if (f->tag != FREETAG) {
+                        printk(KERN_DEBUG "aoe: %ld.%ld isbusy\n",
+                                d->aoemajor, d->aoeminor);
+                        return 1;
+                }
+        } while (++f < e);
+
+        return 0;
+}
+
 struct aoedev *
 aoedev_by_aoeaddr(int maj, int min)
 {
@@ -28,6 +46,18 @@ aoedev_by_aoeaddr(int maj, int min)
         return d;
 }
 
+static void
+dummy_timer(ulong vp)
+{
+        struct aoedev *d;
+
+        d = (struct aoedev *)vp;
+        if (d->flags & DEVFL_TKILL)
+                return;
+        d->timer.expires = jiffies + HZ;
+        add_timer(&d->timer);
+}
+
 /* called with devlist lock held */
 static struct aoedev *
 aoedev_newdev(ulong nframes)
@@ -44,6 +74,8 @@ aoedev_newdev(ulong nframes)
                 return NULL;
         }
 
+        INIT_WORK(&d->work, aoecmd_sleepwork, d);
+
         d->nframes = nframes;
         d->frames = f;
         e = f + nframes;
@@ -52,6 +84,10 @@ aoedev_newdev(ulong nframes)
 
         spin_lock_init(&d->lock);
         init_timer(&d->timer);
+        d->timer.data = (ulong) d;
+        d->timer.function = dummy_timer;
+        d->timer.expires = jiffies + HZ;
+        add_timer(&d->timer);
         d->bufpool = NULL;      /* defer to aoeblk_gdalloc */
         INIT_LIST_HEAD(&d->bufq);
         d->next = devlist;
@@ -67,9 +103,6 @@ aoedev_downdev(struct aoedev *d)
         struct buf *buf;
         struct bio *bio;
 
-        d->flags |= DEVFL_TKILL;
-        del_timer(&d->timer);
-
         f = d->frames;
         e = f + d->nframes;
         for (; f<e; f->tag = FREETAG, f->buf = NULL, f++) {
@@ -92,16 +125,15 @@ aoedev_downdev(struct aoedev *d)
                 bio_endio(bio, bio->bi_size, -EIO);
         }
 
-        if (d->nopen)
-                d->flags |= DEVFL_CLOSEWAIT;
         if (d->gd)
                 d->gd->capacity = 0;
 
-        d->flags &= ~DEVFL_UP;
+        d->flags &= ~(DEVFL_UP | DEVFL_PAUSE);
 }
 
+/* find it or malloc it */
 struct aoedev *
-aoedev_set(ulong sysminor, unsigned char *addr, struct net_device *ifp, ulong bufcnt)
+aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt)
 {
         struct aoedev *d;
         ulong flags;
@@ -112,25 +144,19 @@ aoedev_set(ulong sysminor, unsigned char *addr, struct net_device *ifp, ulong bu
                 if (d->sysminor == sysminor)
                         break;
 
-        if (d == NULL && (d = aoedev_newdev(bufcnt)) == NULL) {
-                spin_unlock_irqrestore(&devlist_lock, flags);
-                printk(KERN_INFO "aoe: aoedev_set: aoedev_newdev failure.\n");
-                return NULL;
-        } /* if newdev, (d->flags & DEVFL_UP) == 0 for below */
-
-        spin_unlock_irqrestore(&devlist_lock, flags);
-        spin_lock_irqsave(&d->lock, flags);
-
-        d->ifp = ifp;
-        memcpy(d->addr, addr, sizeof d->addr);
-        if ((d->flags & DEVFL_UP) == 0) {
-                aoedev_downdev(d); /* flushes outstanding frames */
+        if (d == NULL) {
+                d = aoedev_newdev(bufcnt);
+                if (d == NULL) {
+                        spin_unlock_irqrestore(&devlist_lock, flags);
+                        printk(KERN_INFO "aoe: aoedev_set: aoedev_newdev failure.\n");
+                        return NULL;
+                }
                 d->sysminor = sysminor;
                 d->aoemajor = AOEMAJOR(sysminor);
                 d->aoeminor = AOEMINOR(sysminor);
         }
 
-        spin_unlock_irqrestore(&d->lock, flags);
+        spin_unlock_irqrestore(&devlist_lock, flags);
         return d;
 }
 
@@ -161,6 +187,7 @@ aoedev_exit(void)
 
                 spin_lock_irqsave(&d->lock, flags);
                 aoedev_downdev(d);
+                d->flags |= DEVFL_TKILL;
                 spin_unlock_irqrestore(&d->lock, flags);
 
                 del_timer_sync(&d->timer);