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Fam Zheng

2016-Jun-30 01:59 UTC

[PATCH v2 00/12] gendisk: Generate uevent after attribute available

The race condition is noticed between disk_add() and disk attributes, on
virtio-blk hotplug.

Userspace listens to the KOBJ_ADD uevent generated in add_disk(). At that
point we haven't created the serial attribute file, therefore depending
on how fast udev reacts, the /dev/disk/by-id/ entry doesn't always get
created.

As pointed out by Christoph Hellwig in the specific fix [1], virtio-blk is not
the only driver that suffers from this, so we cannot count on every driver to
send events manually. Moreover as suggested in uevent documentation, it is
advised to defer the KOBJ_ADD event until all attributes are ready:

Documentation/kobject.txt:> Use the KOBJ_ADD action for when the kobject is first added to the kernel.
> This should be done only after any attributes or children of the kobject
> have been initialized properly, as userspace will instantly start to look
> for them when this call happens.
Unfortunately it seems impossible to fix this generally without touching the
offending callers.  The approach I'm proposing here is adding a flag to
suppress uevent in add_disk(), which is patch 1, then in later patches, convert
any caller to only trigger the uevent when attributes are added.

[1] https://lkml.org/lkml/2016/6/28/550

Fam Zheng (12):
  genhd: Add "gen_uevent" parameter to add_disk
  genhd: Honor gen_uevent and add disk_gen_uevents
  virtio-blk: Generate uevent after attribute available
  axonrom: Generate uevent after attribute available
  aoeblk: Generate uevent after attribute available
  mtip32xx: Generate uevent after attribute available
  pktcdvd: Generate uevent after attribute available
  zram: Generate uevent after attribute available
  md: Generate uevent after attribute available
  mmc: Generate uevent after attribute available
  mtd: Generate uevent after attribute available
  nvme: Generate uevent after attribute available

 arch/m68k/emu/nfblock.c                     |  2 +-
 arch/powerpc/sysdev/axonram.c               |  3 ++-
 arch/um/drivers/ubd_kern.c                  |  2 +-
 arch/xtensa/platforms/iss/simdisk.c         |  2 +-
 block/genhd.c                               | 26 +++++++++++++++++++++-----
 drivers/block/DAC960.c                      |  2 +-
 drivers/block/amiflop.c                     |  2 +-
 drivers/block/aoe/aoeblk.c                  |  3 ++-
 drivers/block/ataflop.c                     |  2 +-
 drivers/block/brd.c                         |  4 ++--
 drivers/block/cciss.c                       |  2 +-
 drivers/block/drbd/drbd_main.c              |  2 +-
 drivers/block/floppy.c                      |  2 +-
 drivers/block/hd.c                          |  2 +-
 drivers/block/loop.c                        |  2 +-
 drivers/block/mg_disk.c                     |  2 +-
 drivers/block/mtip32xx/mtip32xx.c           |  3 ++-
 drivers/block/nbd.c                         |  2 +-
 drivers/block/null_blk.c                    |  2 +-
 drivers/block/osdblk.c                      |  2 +-
 drivers/block/paride/pcd.c                  |  2 +-
 drivers/block/paride/pd.c                   |  2 +-
 drivers/block/paride/pf.c                   |  2 +-
 drivers/block/pktcdvd.c                     |  4 +++-
 drivers/block/ps3disk.c                     |  2 +-
 drivers/block/ps3vram.c                     |  2 +-
 drivers/block/rbd.c                         |  2 +-
 drivers/block/rsxx/dev.c                    |  2 +-
 drivers/block/skd_main.c                    |  2 +-
 drivers/block/sunvdc.c                      |  2 +-
 drivers/block/swim.c                        |  2 +-
 drivers/block/swim3.c                       |  2 +-
 drivers/block/sx8.c                         |  2 +-
 drivers/block/umem.c                        |  2 +-
 drivers/block/virtio_blk.c                  |  3 ++-
 drivers/block/xen-blkfront.c                |  2 +-
 drivers/block/xsysace.c                     |  2 +-
 drivers/block/z2ram.c                       |  2 +-
 drivers/block/zram/zram_drv.c               |  3 ++-
 drivers/cdrom/gdrom.c                       |  2 +-
 drivers/ide/ide-cd.c                        |  2 +-
 drivers/ide/ide-gd.c                        |  2 +-
 drivers/lightnvm/core.c                     |  2 +-
 drivers/md/bcache/super.c                   |  4 ++--
 drivers/md/dm.c                             |  2 +-
 drivers/md/md.c                             |  3 ++-
 drivers/memstick/core/ms_block.c            |  2 +-
 drivers/memstick/core/mspro_block.c         |  2 +-
 drivers/mmc/card/block.c                    |  3 ++-
 drivers/mtd/mtd_blkdevs.c                   |  3 ++-
 drivers/mtd/ubi/block.c                     |  2 +-
 drivers/nvdimm/blk.c                        |  2 +-
 drivers/nvdimm/btt.c                        |  2 +-
 drivers/nvdimm/pmem.c                       |  2 +-
 drivers/nvme/host/core.c                    |  3 ++-
 drivers/s390/block/dasd_genhd.c             |  2 +-
 drivers/s390/block/dcssblk.c                |  2 +-
 drivers/s390/block/scm_blk.c                |  2 +-
 drivers/s390/block/xpram.c                  |  2 +-
 drivers/sbus/char/jsflash.c                 |  2 +-
 drivers/scsi/sd.c                           |  2 +-
 drivers/scsi/sr.c                           |  2 +-
 drivers/staging/lustre/lustre/llite/lloop.c |  2 +-
 include/linux/genhd.h                       |  3 ++-
 64 files changed, 98 insertions(+), 70 deletions(-)

-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 01/12] genhd: Add "gen_uevent" parameter to add_disk

The parameter will be used to control whether add_disk should generate
the KOBJ_ADD uevent already.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 arch/m68k/emu/nfblock.c                     | 2 +-
 arch/powerpc/sysdev/axonram.c               | 2 +-
 arch/um/drivers/ubd_kern.c                  | 2 +-
 arch/xtensa/platforms/iss/simdisk.c         | 2 +-
 block/genhd.c                               | 3 ++-
 drivers/block/DAC960.c                      | 2 +-
 drivers/block/amiflop.c                     | 2 +-
 drivers/block/aoe/aoeblk.c                  | 2 +-
 drivers/block/ataflop.c                     | 2 +-
 drivers/block/brd.c                         | 4 ++--
 drivers/block/cciss.c                       | 2 +-
 drivers/block/drbd/drbd_main.c              | 2 +-
 drivers/block/floppy.c                      | 2 +-
 drivers/block/hd.c                          | 2 +-
 drivers/block/loop.c                        | 2 +-
 drivers/block/mg_disk.c                     | 2 +-
 drivers/block/mtip32xx/mtip32xx.c           | 2 +-
 drivers/block/nbd.c                         | 2 +-
 drivers/block/null_blk.c                    | 2 +-
 drivers/block/osdblk.c                      | 2 +-
 drivers/block/paride/pcd.c                  | 2 +-
 drivers/block/paride/pd.c                   | 2 +-
 drivers/block/paride/pf.c                   | 2 +-
 drivers/block/pktcdvd.c                     | 2 +-
 drivers/block/ps3disk.c                     | 2 +-
 drivers/block/ps3vram.c                     | 2 +-
 drivers/block/rbd.c                         | 2 +-
 drivers/block/rsxx/dev.c                    | 2 +-
 drivers/block/skd_main.c                    | 2 +-
 drivers/block/sunvdc.c                      | 2 +-
 drivers/block/swim.c                        | 2 +-
 drivers/block/swim3.c                       | 2 +-
 drivers/block/sx8.c                         | 2 +-
 drivers/block/umem.c                        | 2 +-
 drivers/block/virtio_blk.c                  | 2 +-
 drivers/block/xen-blkfront.c                | 2 +-
 drivers/block/xsysace.c                     | 2 +-
 drivers/block/z2ram.c                       | 2 +-
 drivers/block/zram/zram_drv.c               | 2 +-
 drivers/cdrom/gdrom.c                       | 2 +-
 drivers/ide/ide-cd.c                        | 2 +-
 drivers/ide/ide-gd.c                        | 2 +-
 drivers/lightnvm/core.c                     | 2 +-
 drivers/md/bcache/super.c                   | 4 ++--
 drivers/md/dm.c                             | 2 +-
 drivers/md/md.c                             | 2 +-
 drivers/memstick/core/ms_block.c            | 2 +-
 drivers/memstick/core/mspro_block.c         | 2 +-
 drivers/mmc/card/block.c                    | 2 +-
 drivers/mtd/mtd_blkdevs.c                   | 2 +-
 drivers/mtd/ubi/block.c                     | 2 +-
 drivers/nvdimm/blk.c                        | 2 +-
 drivers/nvdimm/btt.c                        | 2 +-
 drivers/nvdimm/pmem.c                       | 2 +-
 drivers/nvme/host/core.c                    | 2 +-
 drivers/s390/block/dasd_genhd.c             | 2 +-
 drivers/s390/block/dcssblk.c                | 2 +-
 drivers/s390/block/scm_blk.c                | 2 +-
 drivers/s390/block/xpram.c                  | 2 +-
 drivers/sbus/char/jsflash.c                 | 2 +-
 drivers/scsi/sd.c                           | 2 +-
 drivers/scsi/sr.c                           | 2 +-
 drivers/staging/lustre/lustre/llite/lloop.c | 2 +-
 include/linux/genhd.h                       | 2 +-
 64 files changed, 67 insertions(+), 66 deletions(-)

diff --git a/arch/m68k/emu/nfblock.c b/arch/m68k/emu/nfblock.c
index e9110b9..4252568 100644
--- a/arch/m68k/emu/nfblock.c
+++ b/arch/m68k/emu/nfblock.c
@@ -138,7 +138,7 @@ static int __init nfhd_init_one(int id, u32 blocks, u32
bsize)
 	set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
 	dev->disk->queue = dev->queue;
 
-	add_disk(dev->disk);
+	add_disk(dev->disk, true);
 
 	list_add_tail(&dev->list, &nfhd_list);
 
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index ff75d70..4efd69b 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -238,7 +238,7 @@ static int axon_ram_probe(struct platform_device *device)
 	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
 	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
 	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
-	add_disk(bank->disk);
+	add_disk(bank->disk, true);
 
 	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
 	if (bank->irq_id == NO_IRQ) {
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 17e96dc..c2eea65 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -828,7 +828,7 @@ static int ubd_disk_register(int major, u64 size, int unit,
 
 	disk->private_data = &ubd_devs[unit];
 	disk->queue = ubd_devs[unit].queue;
-	add_disk(disk);
+	add_disk(disk, true);
 
 	*disk_out = disk;
 	return 0;
diff --git a/arch/xtensa/platforms/iss/simdisk.c
b/arch/xtensa/platforms/iss/simdisk.c
index f58a4e6..59951a5 100644
--- a/arch/xtensa/platforms/iss/simdisk.c
+++ b/arch/xtensa/platforms/iss/simdisk.c
@@ -288,7 +288,7 @@ static int __init simdisk_setup(struct simdisk *dev, int
which,
 	dev->gd->private_data = dev;
 	snprintf(dev->gd->disk_name, 32, "simdisk%d", which);
 	set_capacity(dev->gd, 0);
-	add_disk(dev->gd);
+	add_disk(dev->gd, true);
 
 	dev->procfile = proc_create_data(tmp, 0644, procdir, &fops, dev);
 	return 0;
diff --git a/block/genhd.c b/block/genhd.c
index 9f42526..8e1bfa1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -575,13 +575,14 @@ exit:
 /**
  * add_disk - add partitioning information to kernel list
  * @disk: per-device partitioning information
+ * @gen_uevent: whether to generate the KOBJ_ADD uevent
  *
  * This function registers the partitioning information in @disk
  * with the kernel.
  *
  * FIXME: error handling
  */
-void add_disk(struct gendisk *disk)
+void add_disk(struct gendisk *disk, bool gen_uevent)
 {
 	struct backing_dev_info *bdi;
 	dev_t devt;
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index 811e11c..c18fc2c 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -3175,7 +3175,7 @@ DAC960_Probe(struct pci_dev *dev, const struct
pci_device_id *entry)
 
   for (disk = 0; disk < DAC960_MaxLogicalDrives; disk++) {
         set_capacity(Controller->disks[disk], disk_size(Controller, disk));
-        add_disk(Controller->disks[disk]);
+        add_disk(Controller->disks[disk], true);
   }
   DAC960_CreateProcEntries(Controller);
   return 0;
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index 5fd50a2..c226b30 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -1738,7 +1738,7 @@ static int __init fd_probe_drives(void)
 		sprintf(disk->disk_name, "fd%d", drive);
 		disk->private_data = &unit[drive];
 		set_capacity(disk, 880*2);
-		add_disk(disk);
+		add_disk(disk, true);
 	}
 	if ((drives > 0) || (nomem == 0)) {
 		if (drives == 0)
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index ec9d861..e91c5f1 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -417,7 +417,7 @@ aoeblk_gdalloc(void *vp)
 
 	spin_unlock_irqrestore(&d->lock, flags);
 
-	add_disk(gd);
+	add_disk(gd, true);
 	aoedisk_add_sysfs(d);
 	aoedisk_add_debugfs(d);
 
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 2104b1b..0feae71 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -1969,7 +1969,7 @@ static int __init atari_floppy_init (void)
 		if (!unit[i].disk->queue)
 			goto Enomem;
 		set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
-		add_disk(unit[i].disk);
+		add_disk(unit[i].disk, true);
 	}
 
 	blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index c04bd9b..7101343 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -552,7 +552,7 @@ static struct brd_device *brd_init_one(int i, bool *new)
 
 	brd = brd_alloc(i);
 	if (brd) {
-		add_disk(brd->brd_disk);
+		add_disk(brd->brd_disk, true);
 		list_add_tail(&brd->brd_list, &brd_devices);
 	}
 	*new = true;
@@ -620,7 +620,7 @@ static int __init brd_init(void)
 	/* point of no return */
 
 	list_for_each_entry(brd, &brd_devices, brd_list)
-		add_disk(brd->brd_disk);
+		add_disk(brd->brd_disk, true);
 
 	blk_register_region(MKDEV(RAMDISK_MAJOR, 0), 1UL << MINORBITS,
 				  THIS_MODULE, brd_probe, NULL, NULL);
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 63c2064..ab93075 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1973,7 +1973,7 @@ static int cciss_add_disk(ctlr_info_t *h, struct gendisk
*disk,
 	/* allows the interrupt handler to start the queue */
 	wmb();
 	h->drv[drv_index]->queue = disk->queue;
-	add_disk(disk);
+	add_disk(disk, true);
 	return 0;
 
 cleanup_queue:
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 2ba1494..7c54597 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2820,7 +2820,7 @@ enum drbd_ret_code drbd_create_device(struct
drbd_config_context *adm_ctx, unsig
 		goto out_idr_remove_vol;
 	}
 
-	add_disk(disk);
+	add_disk(disk, true);
 
 	/* inherit the connection state */
 	device->state.conn = first_connection(resource)->cstate;
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 84708a5..228e8f7 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4350,7 +4350,7 @@ static int __init do_floppy_init(void)
 		disks[drive]->private_data = (void *)(long)drive;
 		disks[drive]->flags |= GENHD_FL_REMOVABLE;
 		disks[drive]->driverfs_dev = &floppy_device[drive].dev;
-		add_disk(disks[drive]);
+		add_disk(disks[drive], true);
 	}
 
 	return 0;
diff --git a/drivers/block/hd.c b/drivers/block/hd.c
index 3abb121..6751c42 100644
--- a/drivers/block/hd.c
+++ b/drivers/block/hd.c
@@ -767,7 +767,7 @@ static int __init hd_init(void)
 
 	/* Let them fly */
 	for (drive = 0; drive < NR_HD; drive++)
-		add_disk(hd_gendisk[drive]);
+		add_disk(hd_gendisk[drive], true);
 
 	return 0;
 
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 1fa8cc2..3223a23 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1800,7 +1800,7 @@ static int loop_add(struct loop_device **l, int i)
 	disk->private_data	= lo;
 	disk->queue		= lo->lo_queue;
 	sprintf(disk->disk_name, "loop%d", i);
-	add_disk(disk);
+	add_disk(disk, true);
 	*l = lo;
 	return lo->lo_number;
 
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
index 145ce2a..9def46b 100644
--- a/drivers/block/mg_disk.c
+++ b/drivers/block/mg_disk.c
@@ -1009,7 +1009,7 @@ static int mg_probe(struct platform_device *plat_dev)
 
 	set_capacity(host->gd, host->n_sectors);
 
-	add_disk(host->gd);
+	add_disk(host->gd, true);
 
 	return err;
 
diff --git a/drivers/block/mtip32xx/mtip32xx.c
b/drivers/block/mtip32xx/mtip32xx.c
index 6053e46..2d09fae 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -4042,7 +4042,7 @@ skip_create_disk:
 	set_capacity(dd->disk, capacity);
 
 	/* Enable the block device and add it to /dev */
-	add_disk(dd->disk);
+	add_disk(dd->disk, true);
 
 	dd->bdev = bdget_disk(dd->disk, 0);
 	/*
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 6a48ed4..4d011c1 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1089,7 +1089,7 @@ static int __init nbd_init(void)
 		disk->private_data = &nbd_dev[i];
 		sprintf(disk->disk_name, "nbd%d", i);
 		nbd_reset(&nbd_dev[i]);
-		add_disk(disk);
+		add_disk(disk, true);
 	}
 
 	return 0;
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index cab9759..bc4c495 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -740,7 +740,7 @@ static int null_add_dev(void)
 	disk->queue		= nullb->q;
 	strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN);
 
-	add_disk(disk);
+	add_disk(disk, true);
 
 done:
 	mutex_lock(&lock);
diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
index c2854a2..5a750e2 100644
--- a/drivers/block/osdblk.c
+++ b/drivers/block/osdblk.c
@@ -448,7 +448,7 @@ static int osdblk_init_disk(struct osdblk_device *osdev)
 
 	/* finally, announce the disk to the world */
 	set_capacity(disk, obj_size / 512ULL);
-	add_disk(disk);
+	add_disk(disk, true);
 
 	printk(KERN_INFO "%s: Added of size 0x%llx\n",
 		disk->disk_name, (unsigned long long)obj_size);
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 9336236..9d03cbe 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -970,7 +970,7 @@ static int __init pcd_init(void)
 			register_cdrom(&cd->info);
 			cd->disk->private_data = cd;
 			cd->disk->queue = pcd_queue;
-			add_disk(cd->disk);
+			add_disk(cd->disk, true);
 		}
 	}
 
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 78a39f7..da45f07 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -906,7 +906,7 @@ static int pd_detect(void)
 	for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
 		if (disk->gd) {
 			set_capacity(disk->gd, disk->capacity);
-			add_disk(disk->gd);
+			add_disk(disk->gd, true);
 			found = 1;
 		}
 	}
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index 7a7d977..9b7f885 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -989,7 +989,7 @@ static int __init pf_init(void)
 			continue;
 		disk->private_data = pf;
 		disk->queue = pf_queue;
-		add_disk(disk);
+		add_disk(disk, true);
 	}
 	return 0;
 }
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index d06c62e..00928406 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2785,7 +2785,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
 	disk->events = pd->bdev->bd_disk->events;
 	disk->async_events = pd->bdev->bd_disk->async_events;
 
-	add_disk(disk);
+	add_disk(disk, true);
 
 	pkt_sysfs_dev_new(pd);
 	pkt_debugfs_dev_new(pd);
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index 4b7e405..bd72d79 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -499,7 +499,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev)
 		 gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
 		 get_capacity(gendisk) >> 11);
 
-	add_disk(gendisk);
+	add_disk(gendisk, true);
 	return 0;
 
 fail_cleanup_queue:
diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c
index 56847fc..ab6acc5 100644
--- a/drivers/block/ps3vram.c
+++ b/drivers/block/ps3vram.c
@@ -780,7 +780,7 @@ static int ps3vram_probe(struct ps3_system_bus_device *dev)
 	dev_info(&dev->core, "%s: Using %lu MiB of GPU memory\n",
 		 gendisk->disk_name, get_capacity(gendisk) >> 11);
 
-	add_disk(gendisk);
+	add_disk(gendisk, true);
 	return 0;
 
 fail_cleanup_queue:
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 81666a5..bee01ae 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -5158,7 +5158,7 @@ static int rbd_dev_device_setup(struct rbd_device
*rbd_dev)
 	set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
 	up_write(&rbd_dev->header_rwsem);
 
-	add_disk(rbd_dev->disk);
+	add_disk(rbd_dev->disk, true);
 	pr_info("%s: added with size 0x%llx\n",
rbd_dev->disk->disk_name,
 		(unsigned long long) rbd_dev->mapping.size);
 
diff --git a/drivers/block/rsxx/dev.c b/drivers/block/rsxx/dev.c
index e1b8b70..b4dc913 100644
--- a/drivers/block/rsxx/dev.c
+++ b/drivers/block/rsxx/dev.c
@@ -230,7 +230,7 @@ int rsxx_attach_dev(struct rsxx_cardinfo *card)
 			set_capacity(card->gendisk, card->size8 >> 9);
 		else
 			set_capacity(card->gendisk, 0);
-		add_disk(card->gendisk);
+		add_disk(card->gendisk, true);
 
 		card->bdev_attached = 1;
 	}
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c
index 910e065..a7de9bb 100644
--- a/drivers/block/skd_main.c
+++ b/drivers/block/skd_main.c
@@ -4693,7 +4693,7 @@ static int skd_bdev_getgeo(struct block_device *bdev,
struct hd_geometry *geo)
 static int skd_bdev_attach(struct skd_device *skdev)
 {
 	pr_debug("%s:%s:%d add_disk\n", skdev->name, __func__, __LINE__);
-	add_disk(skdev->disk);
+	add_disk(skdev->disk, true);
 	return 0;
 }
 
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index 4b911ed..c762c31 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -835,7 +835,7 @@ static int probe_disk(struct vdc_port *port)
 	       port->vdisk_size, (port->vdisk_size >> (20 - 9)),
 	       port->vio.ver.major, port->vio.ver.minor);
 
-	add_disk(g);
+	add_disk(g, true);
 
 	return 0;
 }
diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index b5afd49..c1ff0ee 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -858,7 +858,7 @@ static int swim_floppy_init(struct swim_priv *swd)
 		swd->unit[drive].disk->private_data = &swd->unit[drive];
 		swd->unit[drive].disk->queue = swd->queue;
 		set_capacity(swd->unit[drive].disk, 2880);
-		add_disk(swd->unit[drive].disk);
+		add_disk(swd->unit[drive].disk, true);
 	}
 
 	blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index c264f2d..6940593 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -1240,7 +1240,7 @@ static int swim3_attach(struct macio_dev *mdev,
 	disk->flags |= GENHD_FL_REMOVABLE;
 	sprintf(disk->disk_name, "fd%d", index);
 	set_capacity(disk, 2880);
-	add_disk(disk);
+	add_disk(disk, true);
 
 	return 0;
 }
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index ba4bfe9..ed285f0 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -1333,7 +1333,7 @@ static void carm_fsm_task (struct work_struct *work)
 				struct gendisk *disk = port->disk;
 
 				set_capacity(disk, port->capacity);
-				add_disk(disk);
+				add_disk(disk, true);
 				activated++;
 			}
 
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index 7939b9f..5f6ed17 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -1098,7 +1098,7 @@ static int __init mm_init(void)
 		disk->private_data = &cards[i];
 		disk->queue = cards[i].queue;
 		set_capacity(disk, cards[i].mm_size << 1);
-		add_disk(disk);
+		add_disk(disk, true);
 	}
 
 	init_battery_timer();
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 42758b5..f3a59f9 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -733,7 +733,7 @@ static int virtblk_probe(struct virtio_device *vdev)
 
 	virtio_device_ready(vdev);
 
-	add_disk(vblk->disk);
+	add_disk(vblk->disk, true);
 	err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
 	if (err)
 		goto out_del_disk;
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 2e6d1e9..175983a 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2452,7 +2452,7 @@ static void blkfront_connect(struct blkfront_info *info)
 	for (i = 0; i < info->nr_rings; i++)
 		kick_pending_request_queues(&info->rinfo[i]);
 
-	add_disk(info->gd);
+	add_disk(info->gd, true);
 
 	info->is_ready = 1;
 }
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index c4328d9..7e060e0 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -1057,7 +1057,7 @@ static int ace_setup(struct ace_device *ace)
 	ace_revalidate_disk(ace->gd);
 
 	/* Make the sysace device 'live' */
-	add_disk(ace->gd);
+	add_disk(ace->gd, true);
 
 	return 0;
 
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index 968f9e5..91ccbfb 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -364,7 +364,7 @@ z2_init(void)
     sprintf(z2ram_gendisk->disk_name, "z2ram");
 
     z2ram_gendisk->queue = z2_queue;
-    add_disk(z2ram_gendisk);
+    add_disk(z2ram_gendisk, true);
     blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
 				z2_find, NULL, NULL);
 
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 8fcad8b..d735513 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1287,7 +1287,7 @@ static int zram_add(void)
 		zram->disk->queue->limits.discard_zeroes_data = 0;
 	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zram->disk->queue);
 
-	add_disk(zram->disk);
+	add_disk(zram->disk, true);
 
 	ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj,
 				&zram_disk_attr_group);
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index 584bc31..25403ee 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -817,7 +817,7 @@ static int probe_gdrom(struct platform_device *devptr)
 	gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
 	if (!gd.toc)
 		goto probe_fail_toc;
-	add_disk(gd.disk);
+	add_disk(gd.disk, true);
 	return 0;
 
 probe_fail_toc:
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index ef907fd..39125d0 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1780,7 +1780,7 @@ static int ide_cd_probe(ide_drive_t *drive)
 	ide_cd_read_toc(drive, &sense);
 	g->fops = &idecd_ops;
 	g->flags |= GENHD_FL_REMOVABLE | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
-	add_disk(g);
+	add_disk(g, true);
 	return 0;
 
 out_free_disk:
diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c
index 838996a..6a82457 100644
--- a/drivers/ide/ide-gd.c
+++ b/drivers/ide/ide-gd.c
@@ -417,7 +417,7 @@ static int ide_gd_probe(ide_drive_t *drive)
 	if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
 		g->flags = GENHD_FL_REMOVABLE;
 	g->fops = &ide_gd_ops;
-	add_disk(g);
+	add_disk(g, true);
 	return 0;
 
 out_free_disk:
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 160c1a6..392886c 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -843,7 +843,7 @@ static int nvm_create_target(struct nvm_dev *dev,
 	blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
 
 	set_capacity(tdisk, tt->capacity(targetdata));
-	add_disk(tdisk);
+	add_disk(tdisk, true);
 
 	t->type = tt;
 	t->disk = tdisk;
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index f5dbb4e..ecb401c 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -865,7 +865,7 @@ void bch_cached_dev_run(struct cached_dev *dc)
 		closure_sync(&cl);
 	}
 
-	add_disk(d->disk);
+	add_disk(d->disk, true);
 	bd_link_disk_holder(dc->bdev, dc->disk.disk);
 	/* won't show up in the uevent file, use udevadm monitor -e instead
 	 * only class / kset properties are persistent */
@@ -1228,7 +1228,7 @@ static int flash_dev_run(struct cache_set *c, struct
uuid_entry *u)
 
 	bcache_device_attach(d, c, u - c->uuids);
 	bch_flash_dev_request_init(d);
-	add_disk(d->disk);
+	add_disk(d->disk, true);
 
 	if (kobject_add(&d->kobj, &disk_to_dev(d->disk)->kobj,
"bcache"))
 		goto err;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1b2f962..ad48d4e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2399,7 +2399,7 @@ static struct mapped_device *alloc_dev(int minor)
 	md->disk->queue = md->queue;
 	md->disk->private_data = md;
 	sprintf(md->disk->disk_name, "dm-%d", minor);
-	add_disk(md->disk);
+	add_disk(md->disk, true);
 	format_dev_t(md->name, MKDEV(_major, minor));
 
 	md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 866825f..1391c72 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5055,7 +5055,7 @@ static int md_alloc(dev_t dev, char *name)
 	 * through to md_open, so make sure it doesn't get too far
 	 */
 	mutex_lock(&mddev->open_mutex);
-	add_disk(disk);
+	add_disk(disk, true);
 
 	error = kobject_init_and_add(&mddev->kobj, &md_ktype,
 				     &disk_to_dev(disk)->kobj, "%s", "md");
diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
index 3cd6815..9fe45ba 100644
--- a/drivers/memstick/core/ms_block.c
+++ b/drivers/memstick/core/ms_block.c
@@ -2163,7 +2163,7 @@ static int msb_init_disk(struct memstick_dev *card)
 		set_disk_ro(msb->disk, 1);
 
 	msb_start(card);
-	add_disk(msb->disk);
+	add_disk(msb->disk, true);
 	dbg("Disk added");
 	return 0;
 
diff --git a/drivers/memstick/core/mspro_block.c
b/drivers/memstick/core/mspro_block.c
index 0fb27d3..cd4e16d 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -1255,7 +1255,7 @@ static int mspro_block_init_disk(struct memstick_dev
*card)
 	set_capacity(msb->disk, capacity);
 	dev_dbg(&card->dev, "capacity set %ld\n", capacity);
 
-	add_disk(msb->disk);
+	add_disk(msb->disk, true);
 	msb->active = 1;
 	return 0;
 
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index e62fde3..94cf51e 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -2457,7 +2457,7 @@ static int mmc_add_disk(struct mmc_blk_data *md)
 	int ret;
 	struct mmc_card *card = md->queue.card;
 
-	add_disk(md->disk);
+	add_disk(md->disk, true);
 	md->force_ro.show = force_ro_show;
 	md->force_ro.store = force_ro_store;
 	sysfs_attr_init(&md->force_ro.attr);
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 74ae243..ab3bc22 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -436,7 +436,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 	if (new->readonly)
 		set_disk_ro(gd, 1);
 
-	add_disk(gd);
+	add_disk(gd, true);
 
 	if (new->disk_attributes) {
 		ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index ebf46ad..125716d 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -445,7 +445,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
 	mutex_unlock(&devices_mutex);
 
 	/* Must be the last step: anyone can call file ops from now on */
-	add_disk(dev->gd);
+	add_disk(dev->gd, true);
 	dev_info(disk_to_dev(dev->gd), "created from ubi%d:%d(%s)",
 		 dev->ubi_num, dev->vol_id, vi->name);
 	return 0;
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index 495e06d9..0175c6c 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -294,7 +294,7 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
 	disk->flags		= GENHD_FL_EXT_DEVT;
 	nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name);
 	set_capacity(disk, 0);
-	add_disk(disk);
+	add_disk(disk, true);
 
 	if (nsblk_meta_size(nsblk)) {
 		int rc = nd_integrity_init(disk, nsblk_meta_size(nsblk));
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 68a7c3c..4a54a92 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1258,7 +1258,7 @@ static int btt_blk_init(struct btt *btt)
 	btt->btt_queue->queuedata = btt;
 
 	set_capacity(btt->btt_disk, 0);
-	add_disk(btt->btt_disk);
+	add_disk(btt->btt_disk, true);
 	if (btt_meta_size(btt)) {
 		int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));
 
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 608fc44..b23a946 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -304,7 +304,7 @@ static int pmem_attach_disk(struct device *dev,
 		return -ENOMEM;
 	nvdimm_badblocks_populate(to_nd_region(dev->parent), &pmem->bb,
res);
 	disk->bb = &pmem->bb;
-	add_disk(disk);
+	add_disk(disk, true);
 	revalidate_disk(disk);
 
 	return 0;
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 1a51584..fd70894 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1462,7 +1462,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned
nsid)
 	if (ns->type == NVME_NS_LIGHTNVM)
 		return;
 
-	add_disk(ns->disk);
+	add_disk(ns->disk, true);
 	if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
 					&nvme_ns_attr_group))
 		pr_warn("%s: failed to create sysfs group for identification\n",
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 31d544a..5db81d5 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -76,7 +76,7 @@ int dasd_gendisk_alloc(struct dasd_block *block)
 	gdp->queue = block->request_queue;
 	block->gdp = gdp;
 	set_capacity(block->gdp, 0);
-	add_disk(block->gdp);
+	add_disk(block->gdp, true);
 	return 0;
 }
 
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index bed53c4..63a6fba 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -655,7 +655,7 @@ dcssblk_add_store(struct device *dev, struct
device_attribute *attr, const char
 		goto put_dev;
 
 	get_device(&dev_info->dev);
-	add_disk(dev_info->gd);
+	add_disk(dev_info->gd, true);
 
 	switch (dev_info->segment_type) {
 		case SEG_TYPE_SR:
diff --git a/drivers/s390/block/scm_blk.c b/drivers/s390/block/scm_blk.c
index e6f54d3..c3110e0 100644
--- a/drivers/s390/block/scm_blk.c
+++ b/drivers/s390/block/scm_blk.c
@@ -531,7 +531,7 @@ int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct
scm_device *scmdev)
 
 	/* 512 byte sectors */
 	set_capacity(bdev->gendisk, scmdev->size >> 9);
-	add_disk(bdev->gendisk);
+	add_disk(bdev->gendisk, true);
 	return 0;
 
 out_queue:
diff --git a/drivers/s390/block/xpram.c b/drivers/s390/block/xpram.c
index 288f59a..e18c58c 100644
--- a/drivers/s390/block/xpram.c
+++ b/drivers/s390/block/xpram.c
@@ -377,7 +377,7 @@ static int __init xpram_setup_blkdev(void)
 		disk->queue = xpram_queues[i];
 		sprintf(disk->disk_name, "slram%d", i);
 		set_capacity(disk, xpram_sizes[i] << 1);
-		add_disk(disk);
+		add_disk(disk, true);
 	}
 
 	return 0;
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index a40ee1e..d45e193 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -590,7 +590,7 @@ static int jsfd_init(void)
 		set_capacity(disk, jdp->dsize >> 9);
 		disk->private_data = jdp;
 		disk->queue = jsf_queue;
-		add_disk(disk);
+		add_disk(disk, true);
 		set_disk_ro(disk, 1);
 	}
 	return 0;
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 60bff78..35515a2 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2996,7 +2996,7 @@ static void sd_probe_async(void *data, async_cookie_t
cookie)
 	}
 
 	blk_pm_runtime_init(sdp->request_queue, dev);
-	add_disk(gd);
+	add_disk(gd, true);
 	if (sdkp->capacity)
 		sd_dif_config_host(sdkp);
 
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 64c8674..57ea120 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -730,7 +730,7 @@ static int sr_probe(struct device *dev)
 
 	dev_set_drvdata(dev, cd);
 	disk->flags |= GENHD_FL_REMOVABLE;
-	add_disk(disk);
+	add_disk(disk, true);
 
 	sdev_printk(KERN_DEBUG, sdev,
 		    "Attached scsi CD-ROM %s\n", cd->cdi.name);
diff --git a/drivers/staging/lustre/lustre/llite/lloop.c
b/drivers/staging/lustre/lustre/llite/lloop.c
index 813a9a3..748f6fd 100644
--- a/drivers/staging/lustre/lustre/llite/lloop.c
+++ b/drivers/staging/lustre/lustre/llite/lloop.c
@@ -835,7 +835,7 @@ static int __init lloop_init(void)
 
 	/* We cannot fail after we call this, so another loop!*/
 	for (i = 0; i < max_loop; i++)
-		add_disk(disks[i]);
+		add_disk(disks[i], true);
 	return 0;
 
 out_mem4:
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 359a8e4..038be80 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -414,7 +414,7 @@ static inline void free_part_info(struct hd_struct *part)
 extern void part_round_stats(int cpu, struct hd_struct *part);
 
 /* block/genhd.c */
-extern void add_disk(struct gendisk *disk);
+extern void add_disk(struct gendisk *disk, bool gen_uevent);
 extern void del_gendisk(struct gendisk *gp);
 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 02/12] genhd: Honor gen_uevent and add disk_gen_uevents

In add_disk(), don't send uevent to userspace when gen_uevent is true;
also export the refactored function disk_gen_uevents for later use.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 block/genhd.c         | 23 +++++++++++++++++++----
 include/linux/genhd.h |  1 +
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 8e1bfa1..9b66953 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -506,12 +506,10 @@ static int exact_lock(dev_t devt, void *data)
 	return 0;
 }
 
-static void register_disk(struct gendisk *disk)
+static void register_disk(struct gendisk *disk, bool gen_uevent)
 {
 	struct device *ddev = disk_to_dev(disk);
 	struct block_device *bdev;
-	struct disk_part_iter piter;
-	struct hd_struct *part;
 	int err;
 
 	ddev->parent = disk->driverfs_dev;
@@ -563,6 +561,22 @@ static void register_disk(struct gendisk *disk)
 exit:
 	/* announce disk after possible partitions are created */
 	dev_set_uevent_suppress(ddev, 0);
+	if (gen_uevent)
+		disk_gen_uevents(disk);
+}
+
+/**
+ * disk_gen_uevents
+ * @disk - the disk to generate uevent
+ *
+ * Generate KOBJ_ADD uevents on the disk and partitions.
+ */
+void disk_gen_uevents(struct gendisk *disk)
+{
+	struct device *ddev = disk_to_dev(disk);
+	struct disk_part_iter piter;
+	struct hd_struct *part;
+
 	kobject_uevent(&ddev->kobj, KOBJ_ADD);
 
 	/* announce possible partitions */
@@ -571,6 +585,7 @@ exit:
 		kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
 	disk_part_iter_exit(&piter);
 }
+EXPORT_SYMBOL(disk_gen_uevents);
 
 /**
  * add_disk - add partitioning information to kernel list
@@ -618,7 +633,7 @@ void add_disk(struct gendisk *disk, bool gen_uevent)
 
 	blk_register_region(disk_devt(disk), disk->minors, NULL,
 			    exact_match, exact_lock, disk);
-	register_disk(disk);
+	register_disk(disk, gen_uevent);
 	blk_register_queue(disk);
 
 	/*
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 038be80..87ad9e5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -416,6 +416,7 @@ extern void part_round_stats(int cpu, struct hd_struct
*part);
 /* block/genhd.c */
 extern void add_disk(struct gendisk *disk, bool gen_uevent);
 extern void del_gendisk(struct gendisk *gp);
+extern void disk_gen_uevents(struct gendisk *disk);
 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 03/12] virtio-blk: Generate uevent after attribute available

Userspace listens to the KOBJ_ADD uevent generated in add_disk. At that
point we haven't created the serial attribute file, therefore depending
on how fast udev reacts, the /dev/disk/by-id/ entry doesn't always get
created.

This race condition can be easily reproduced by hot plugging a number of
virtio-blk disks.

Also in systemd, there used to be a related workaround in udev rules
called 'WAIT_FOR="serial"', but it is removed in later
versions.

Now let's generate a KOBJ_CHANGE event after the attributes are ready.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/block/virtio_blk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index f3a59f9..cd9a036 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -733,7 +733,7 @@ static int virtblk_probe(struct virtio_device *vdev)
 
 	virtio_device_ready(vdev);
 
-	add_disk(vblk->disk, true);
+	add_disk(vblk->disk, false);
 	err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
 	if (err)
 		goto out_del_disk;
@@ -746,6 +746,7 @@ static int virtblk_probe(struct virtio_device *vdev)
 					 &dev_attr_cache_type_ro);
 	if (err)
 		goto out_del_disk;
+	disk_gen_uevents(vblk->disk);
 	return 0;
 
 out_del_disk:
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 04/12] axonrom: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 arch/powerpc/sysdev/axonram.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index 4efd69b..27e7175 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -238,7 +238,7 @@ static int axon_ram_probe(struct platform_device *device)
 	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
 	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
 	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
-	add_disk(bank->disk, true);
+	add_disk(bank->disk, false);
 
 	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
 	if (bank->irq_id == NO_IRQ) {
@@ -262,6 +262,7 @@ static int axon_ram_probe(struct platform_device *device)
 		rc = -EFAULT;
 		goto failed;
 	}
+	disk_gen_uevents(bank->disk);
 
 	azfs_minor += bank->disk->minors;
 
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 05/12] aoeblk: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/block/aoe/aoeblk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index e91c5f1..f0cf4d6 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -417,9 +417,10 @@ aoeblk_gdalloc(void *vp)
 
 	spin_unlock_irqrestore(&d->lock, flags);
 
-	add_disk(gd, true);
+	add_disk(gd, false);
 	aoedisk_add_sysfs(d);
 	aoedisk_add_debugfs(d);
+	disk_gen_uevents(gd);
 
 	spin_lock_irqsave(&d->lock, flags);
 	WARN_ON(!(d->flags & DEVFL_GD_NOW));
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 06/12] mtip32xx: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/block/mtip32xx/mtip32xx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c
b/drivers/block/mtip32xx/mtip32xx.c
index 2d09fae..8c1cf03 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -4042,7 +4042,7 @@ skip_create_disk:
 	set_capacity(dd->disk, capacity);
 
 	/* Enable the block device and add it to /dev */
-	add_disk(dd->disk, true);
+	add_disk(dd->disk, false);
 
 	dd->bdev = bdget_disk(dd->disk, 0);
 	/*
@@ -4054,6 +4054,7 @@ skip_create_disk:
 		mtip_hw_sysfs_init(dd, kobj);
 		kobject_put(kobj);
 	}
+	disk_gen_uevents(dd->disk);
 
 	if (dd->mtip_svc_handler) {
 		set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 07/12] pktcdvd: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/block/pktcdvd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 00928406..a4e6bb7 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2785,11 +2785,13 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
 	disk->events = pd->bdev->bd_disk->events;
 	disk->async_events = pd->bdev->bd_disk->async_events;
 
-	add_disk(disk, true);
+	add_disk(disk, false);
 
 	pkt_sysfs_dev_new(pd);
 	pkt_debugfs_dev_new(pd);
 
+	disk_gen_uevents(disk);
+
 	pkt_devs[idx] = pd;
 	if (pkt_dev)
 		*pkt_dev = pd->pkt_dev;
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 08/12] zram: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/block/zram/zram_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index d735513..83f10a0 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1287,7 +1287,7 @@ static int zram_add(void)
 		zram->disk->queue->limits.discard_zeroes_data = 0;
 	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zram->disk->queue);
 
-	add_disk(zram->disk, true);
+	add_disk(zram->disk, false);
 
 	ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj,
 				&zram_disk_attr_group);
@@ -1296,6 +1296,7 @@ static int zram_add(void)
 				device_id);
 		goto out_free_disk;
 	}
+	disk_gen_uevents(zram->disk);
 	strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));
 	zram->meta = NULL;
 
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 09/12] md: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/md/md.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1391c72..dcd09ea 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5055,7 +5055,7 @@ static int md_alloc(dev_t dev, char *name)
 	 * through to md_open, so make sure it doesn't get too far
 	 */
 	mutex_lock(&mddev->open_mutex);
-	add_disk(disk, true);
+	add_disk(disk, false);
 
 	error = kobject_init_and_add(&mddev->kobj, &md_ktype,
 				     &disk_to_dev(disk)->kobj, "%s", "md");
@@ -5070,6 +5070,7 @@ static int md_alloc(dev_t dev, char *name)
 	if (mddev->kobj.sd &&
 	    sysfs_create_group(&mddev->kobj, &md_bitmap_group))
 		printk(KERN_DEBUG "pointless warning\n");
+	disk_gen_uevents(disk);
 	mutex_unlock(&mddev->open_mutex);
  abort:
 	mutex_unlock(&disks_mutex);
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 10/12] mmc: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/mmc/card/block.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 94cf51e..4007106 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -2457,7 +2457,7 @@ static int mmc_add_disk(struct mmc_blk_data *md)
 	int ret;
 	struct mmc_card *card = md->queue.card;
 
-	add_disk(md->disk, true);
+	add_disk(md->disk, false);
 	md->force_ro.show = force_ro_show;
 	md->force_ro.store = force_ro_store;
 	sysfs_attr_init(&md->force_ro.attr);
@@ -2466,6 +2466,7 @@ static int mmc_add_disk(struct mmc_blk_data *md)
 	ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
 	if (ret)
 		goto force_ro_fail;
+	disk_gen_uevents(md->disk);
 
 	if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
 	     card->ext_csd.boot_ro_lockable) {
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 11/12] mtd: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/mtd/mtd_blkdevs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index ab3bc22..6848141 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -436,13 +436,14 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 	if (new->readonly)
 		set_disk_ro(gd, 1);
 
-	add_disk(gd, true);
+	add_disk(gd, false);
 
 	if (new->disk_attributes) {
 		ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
 					new->disk_attributes);
 		WARN_ON(ret);
 	}
+	disk_gen_uevents(gd);
 	return 0;
 error4:
 	blk_cleanup_queue(new->rq);
-- 
2.9.0

Fam Zheng

2016-Jun-30 01:59 UTC

head link

[PATCH v2 12/12] nvme: Generate uevent after attribute available

It is documented that KOBJ_ADD should be generated after the object's
attributes and children are ready.  We can achieve this with the new
disk_gen_uevents interface.

Signed-off-by: Fam Zheng <famz at redhat.com>
---
 drivers/nvme/host/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index fd70894..2655521 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1462,11 +1462,12 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl,
unsigned nsid)
 	if (ns->type == NVME_NS_LIGHTNVM)
 		return;
 
-	add_disk(ns->disk, true);
+	add_disk(ns->disk, false);
 	if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
 					&nvme_ns_attr_group))
 		pr_warn("%s: failed to create sysfs group for identification\n",
 			ns->disk->disk_name);
+	disk_gen_uevents(ns->disk);
 	return;
  out_free_disk:
 	kfree(disk);
-- 
2.9.0

kbuild test robot

2016-Jun-30 03:26 UTC

head link

[PATCH v2 02/12] genhd: Honor gen_uevent and add disk_gen_uevents

Hi,

[auto build test WARNING on block/for-next]
[also build test WARNING on v4.7-rc5]
[cannot apply to next-20160629]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]

url:   
https://github.com/0day-ci/linux/commits/Fam-Zheng/gendisk-Generate-uevent-after-attribute-available/20160630-100720
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
for-next
reproduce: make htmldocs

All warnings (new ones prefixed by >>):

   lib/crc32.c:148: warning: No description found for parameter
'tab)[256]'
   lib/crc32.c:148: warning: Excess function parameter 'tab' description
in 'crc32_le_generic'
   lib/crc32.c:293: warning: No description found for parameter
'tab)[256]'
   lib/crc32.c:293: warning: Excess function parameter 'tab' description
in 'crc32_be_generic'
   lib/crc32.c:1: warning: no structured comments found
   mm/memory.c:2881: warning: No description found for parameter
'old'>> block/genhd.c:575: warning: No description found for parameter
'disk'
>> block/genhd.c:575: warning: No description found for parameter
'disk'
vim +/disk +575 block/genhd.c

   559		blkdev_put(bdev, FMODE_READ);
   560	
   561	exit:
   562		/* announce disk after possible partitions are created */
   563		dev_set_uevent_suppress(ddev, 0);
   564		if (gen_uevent)
   565			disk_gen_uevents(disk);
   566	}
   567	
   568	/**
   569	 * disk_gen_uevents
   570	 * @disk - the disk to generate uevent
   571	 *
   572	 * Generate KOBJ_ADD uevents on the disk and partitions.
   573	 */
   574	void disk_gen_uevents(struct gendisk *disk)
 > 575	{
   576		struct device *ddev = disk_to_dev(disk);
   577		struct disk_part_iter piter;
   578		struct hd_struct *part;
   579	
   580		kobject_uevent(&ddev->kobj, KOBJ_ADD);
   581	
   582		/* announce possible partitions */
   583		disk_part_iter_init(&piter, disk, 0);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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Christoph Hellwig

2016-Jun-30 06:24 UTC

head link

[PATCH v2 00/12] gendisk: Generate uevent after attribute available

On Thu, Jun 30, 2016 at 09:59:41AM +0800, Fam Zheng
wrote:> Documentation/kobject.txt:
> > Use the KOBJ_ADD action for when the kobject is first added to the
kernel.
> > This should be done only after any attributes or children of the
kobject
> > have been initialized properly, as userspace will instantly start to
look
> > for them when this call happens.
> 
> Unfortunately it seems impossible to fix this generally without touching
the
> offending callers.  The approach I'm proposing here is adding a flag to
> suppress uevent in add_disk(), which is patch 1, then in later patches,
convert
> any caller to only trigger the uevent when attributes are added.
We (or rather Dan) is touching most add_disk callers anyway for the
driverfs_dev removal.  Let's just pass the array of attributes to
a disk_add variant and solve the issue for real.

Fam Zheng

2016-Jun-30 06:35 UTC

head link

[PATCH v2 00/12] gendisk: Generate uevent after attribute available

On Wed, 06/29 23:24, Christoph Hellwig wrote:> On Thu, Jun 30, 2016 at 09:59:41AM +0800, Fam Zheng wrote:
> > Documentation/kobject.txt:
> > > Use the KOBJ_ADD action for when the kobject is first added to
the kernel.
> > > This should be done only after any attributes or children of the
kobject
> > > have been initialized properly, as userspace will instantly start
to look
> > > for them when this call happens.
> > 
> > Unfortunately it seems impossible to fix this generally without
touching the
> > offending callers.  The approach I'm proposing here is adding a
flag to
> > suppress uevent in add_disk(), which is patch 1, then in later
patches, convert
> > any caller to only trigger the uevent when attributes are added.
> 
> We (or rather Dan) is touching most add_disk callers anyway for the
> driverfs_dev removal.  Let's just pass the array of attributes to
> a disk_add variant and solve the issue for real.
I thought about that. Its usage is more compact compared to this series, but is
also more code and less flexible IMO.  For example, we need at least two
variants, for attribute_group and device_attribute separately, right?

Fam

Dan Williams

2016-Jun-30 22:10 UTC

head link

[PATCH v2 04/12] axonrom: Generate uevent after attribute available

On Wed, Jun 29, 2016 at 6:59 PM, Fam Zheng <famz at redhat.com>
wrote:> It is documented that KOBJ_ADD should be generated after the object's
> attributes and children are ready.  We can achieve this with the new
> disk_gen_uevents interface.
>
> Signed-off-by: Fam Zheng <famz at redhat.com>
> ---
>  arch/powerpc/sysdev/axonram.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
> index 4efd69b..27e7175 100644
> --- a/arch/powerpc/sysdev/axonram.c
> +++ b/arch/powerpc/sysdev/axonram.c
> @@ -238,7 +238,7 @@ static int axon_ram_probe(struct platform_device
*device)
>         set_capacity(bank->disk, bank->size >>
AXON_RAM_SECTOR_SHIFT);
>         blk_queue_make_request(bank->disk->queue,
axon_ram_make_request);
>         blk_queue_logical_block_size(bank->disk->queue,
AXON_RAM_SECTOR_SIZE);
> -       add_disk(bank->disk, true);
> +       add_disk(bank->disk, false);
>
>         bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
>         if (bank->irq_id == NO_IRQ) {
> @@ -262,6 +262,7 @@ static int axon_ram_probe(struct platform_device
*device)
>                 rc = -EFAULT;
>                 goto failed;
>         }
> +       disk_gen_uevents(bank->disk);
I assume you are doing this after:

   rc = device_create_file(&device->dev, &dev_attr_ecc);

...so that userspace gets notified of the new attribute, but this
attribute is on the parent device, not the disk itself.  Instead I
think this attribute should simply be registered before the call to
add_disk().  Then the KOBJ_ADD event for the disk comes after the
attribute is available.  It's still not a clean fit, because userspace
should not be expecting a child device uevent to signal new attributes
available on the parent.

Ed Cashin

2016-Jul-01 00:57 UTC

head link

[PATCH v2 05/12] aoeblk: Generate uevent after attribute available

On 06/29/2016 09:59 PM, Fam Zheng wrote:> It is documented that KOBJ_ADD should be generated after the object's
> attributes and children are ready.  We can achieve this with the new
> disk_gen_uevents interface.
Looks like an improvement, thanks!

-- 
   Ed

Possibly Parallel Threads

Search for more possibly parallel threads

Linux Virtualization - Jun 2016 - [PATCH v2 04/12] axonrom: Generate uevent after attribute available

[PATCH v2 00/12] gendisk: Generate uevent after attribute available

[PATCH v2 01/12] genhd: Add "gen_uevent" parameter to add_disk

[PATCH v2 02/12] genhd: Honor gen_uevent and add disk_gen_uevents

[PATCH v2 03/12] virtio-blk: Generate uevent after attribute available

[PATCH v2 04/12] axonrom: Generate uevent after attribute available

[PATCH v2 05/12] aoeblk: Generate uevent after attribute available

[PATCH v2 06/12] mtip32xx: Generate uevent after attribute available

[PATCH v2 07/12] pktcdvd: Generate uevent after attribute available

[PATCH v2 08/12] zram: Generate uevent after attribute available

[PATCH v2 09/12] md: Generate uevent after attribute available

[PATCH v2 10/12] mmc: Generate uevent after attribute available

[PATCH v2 11/12] mtd: Generate uevent after attribute available

[PATCH v2 12/12] nvme: Generate uevent after attribute available

[PATCH v2 02/12] genhd: Honor gen_uevent and add disk_gen_uevents

[PATCH v2 00/12] gendisk: Generate uevent after attribute available

[PATCH v2 00/12] gendisk: Generate uevent after attribute available

[PATCH v2 04/12] axonrom: Generate uevent after attribute available

[PATCH v2 05/12] aoeblk: Generate uevent after attribute available

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