From d4d7e5dffc4844ef51fe11f497bd774c04413a00 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Fri, 24 Mar 2006 20:45:35 +0100 Subject: [PATCH] [PATCH] BLOCK: delay all uevents until partition table is scanned [BLOCK] delay all uevents until partition table is scanned Here we delay the annoucement of all block device events until the disk's partition table is scanned and all partition devices are already created and sysfs is populated. We have a bunch of old bugs for removable storage handling where we probe successfully for a filesystem on the raw disk, but at the same time the kernel recognizes a partition table and creates partition devices. Currently there is no sane way to tell if partitions will show up or not at the time the disk device is announced to userspace. With the delayed events we can simply skip any probe for a filesystem on the raw disk when we find already present partitions. Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- fs/partitions/check.c | 38 ++++++++++++++++++++++++++++++-------- include/linux/genhd.h | 1 + 2 files changed, 31 insertions(+), 8 deletions(-) diff --git a/fs/partitions/check.c b/fs/partitions/check.c index af0cb4b9e784..f3b6af071722 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -331,7 +331,9 @@ void delete_partition(struct gendisk *disk, int part) devfs_remove("%s/part%d", disk->devfs_name, part); if (p->holder_dir) kobject_unregister(p->holder_dir); - kobject_unregister(&p->kobj); + kobject_uevent(&p->kobj, KOBJ_REMOVE); + kobject_del(&p->kobj); + kobject_put(&p->kobj); } void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len) @@ -357,7 +359,10 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len) snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part); p->kobj.parent = &disk->kobj; p->kobj.ktype = &ktype_part; - kobject_register(&p->kobj); + kobject_init(&p->kobj); + kobject_add(&p->kobj); + if (!disk->part_uevent_suppress) + kobject_uevent(&p->kobj, KOBJ_ADD); partition_sysfs_add_subdir(p); disk->part[part-1] = p; } @@ -395,6 +400,8 @@ void register_disk(struct gendisk *disk) { struct block_device *bdev; char *s; + int i; + struct hd_struct *p; int err; strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN); @@ -406,13 +413,12 @@ void register_disk(struct gendisk *disk) return; disk_sysfs_symlinks(disk); disk_sysfs_add_subdirs(disk); - kobject_uevent(&disk->kobj, KOBJ_ADD); /* No minors to use for partitions */ if (disk->minors == 1) { if (disk->devfs_name[0] != '\0') devfs_add_disk(disk); - return; + goto exit; } /* always add handle for the whole disk */ @@ -420,16 +426,32 @@ void register_disk(struct gendisk *disk) /* No such device (e.g., media were just removed) */ if (!get_capacity(disk)) - return; + goto exit; bdev = bdget_disk(disk, 0); if (!bdev) - return; + goto exit; + /* scan partition table, but suppress uevents */ bdev->bd_invalidated = 1; - if (blkdev_get(bdev, FMODE_READ, 0) < 0) - return; + disk->part_uevent_suppress = 1; + err = blkdev_get(bdev, FMODE_READ, 0); + disk->part_uevent_suppress = 0; + if (err < 0) + goto exit; blkdev_put(bdev); + +exit: + /* announce disk after possible partitions are already created */ + kobject_uevent(&disk->kobj, KOBJ_ADD); + + /* announce possible partitions */ + for (i = 1; i < disk->minors; i++) { + p = disk->part[i-1]; + if (!p || !p->nr_sects) + continue; + kobject_uevent(&p->kobj, KOBJ_ADD); + } } int rescan_partitions(struct gendisk *disk, struct block_device *bdev) diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 10a27f29d692..2ef845b35175 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -105,6 +105,7 @@ struct gendisk { * disks that can't be partitioned. */ char disk_name[32]; /* name of major driver */ struct hd_struct **part; /* [indexed by minor] */ + int part_uevent_suppress; struct block_device_operations *fops; struct request_queue *queue; void *private_data; -- 2.20.1