diff options
Diffstat (limited to 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 53 |
1 files changed, 41 insertions, 12 deletions
diff --git a/block/genhd.c b/block/genhd.c index ab3cbe44196f..3ee5577e1586 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -356,9 +356,10 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action) } EXPORT_SYMBOL_GPL(disk_uevent); -int disk_scan_partitions(struct gendisk *disk, fmode_t mode, void *owner) +int disk_scan_partitions(struct gendisk *disk, fmode_t mode) { struct block_device *bdev; + int ret = 0; if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) return -EINVAL; @@ -366,16 +367,29 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode, void *owner) return -EINVAL; if (disk->open_partitions) return -EBUSY; - /* Someone else has bdev exclusively open? */ - if (disk->part0->bd_holder && disk->part0->bd_holder != owner) - return -EBUSY; set_bit(GD_NEED_PART_SCAN, &disk->state); - bdev = blkdev_get_by_dev(disk_devt(disk), mode, NULL); + /* + * If the device is opened exclusively by current thread already, it's + * safe to scan partitons, otherwise, use bd_prepare_to_claim() to + * synchronize with other exclusive openers and other partition + * scanners. + */ + if (!(mode & FMODE_EXCL)) { + ret = bd_prepare_to_claim(disk->part0, disk_scan_partitions); + if (ret) + return ret; + } + + bdev = blkdev_get_by_dev(disk_devt(disk), mode & ~FMODE_EXCL, NULL); if (IS_ERR(bdev)) - return PTR_ERR(bdev); - blkdev_put(bdev, mode); - return 0; + ret = PTR_ERR(bdev); + else + blkdev_put(bdev, mode); + + if (!(mode & FMODE_EXCL)) + bd_abort_claiming(disk->part0, disk_scan_partitions); + return ret; } /** @@ -497,9 +511,14 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, if (ret) goto out_unregister_bdi; + /* Make sure the first partition scan will be proceed */ + if (get_capacity(disk) && !(disk->flags & GENHD_FL_NO_PART) && + !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) + set_bit(GD_NEED_PART_SCAN, &disk->state); + bdev_add(disk->part0, ddev->devt); if (get_capacity(disk)) - disk_scan_partitions(disk, FMODE_READ, NULL); + disk_scan_partitions(disk, FMODE_READ); /* * Announce the disk and partitions after all partitions are @@ -1016,9 +1035,8 @@ ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, static ssize_t disk_capability_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct gendisk *disk = dev_to_disk(dev); - - return sprintf(buf, "%x\n", disk->flags); + dev_warn_once(dev, "the capability attribute has been deprecated.\n"); + return sprintf(buf, "0\n"); } static ssize_t disk_alignment_offset_show(struct device *dev, @@ -1201,10 +1219,21 @@ struct class block_class = { .dev_uevent = block_uevent, }; +static char *block_devnode(const struct device *dev, umode_t *mode, + kuid_t *uid, kgid_t *gid) +{ + struct gendisk *disk = dev_to_disk(dev); + + if (disk->fops->devnode) + return disk->fops->devnode(disk, mode); + return NULL; +} + const struct device_type disk_type = { .name = "disk", .groups = disk_attr_groups, .release = disk_release, + .devnode = block_devnode, }; #ifdef CONFIG_PROC_FS |