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authorChristoph Hellwig <hch@lst.de>2021-06-24 14:32:39 +0200
committerJens Axboe <axboe@kernel.dk>2021-06-24 12:01:06 -0600
commit630161cfdf5cdc696a82b59410d1ff00b23d946e (patch)
treed84d056d9038e311454ca852b8da9057a3a5173b /block/partitions
parent2bc8cda5ea4b42ff78be1b11011092d57b424d37 (diff)
block: move bdev_disk_changed
Move bdev_disk_changed to block/partitions/core.c, together with the rest of the partition scanning code. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210624123240.441814-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/partitions')
-rw-r--r--block/partitions/core.c55
1 files changed, 54 insertions, 1 deletions
diff --git a/block/partitions/core.c b/block/partitions/core.c
index 186d4fbd9f09..b79785f7027c 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -596,7 +596,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
return true;
}
-int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
+static int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
{
struct parsed_partitions *state;
int ret = -EAGAIN, p;
@@ -657,6 +657,59 @@ out_free_state:
return ret;
}
+int bdev_disk_changed(struct block_device *bdev, bool invalidate)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ int ret = 0;
+
+ lockdep_assert_held(&disk->open_mutex);
+
+ if (!(disk->flags & GENHD_FL_UP))
+ return -ENXIO;
+
+rescan:
+ if (disk->open_partitions)
+ return -EBUSY;
+ sync_blockdev(bdev);
+ invalidate_bdev(bdev);
+ blk_drop_partitions(disk);
+
+ clear_bit(GD_NEED_PART_SCAN, &disk->state);
+
+ /*
+ * Historically we only set the capacity to zero for devices that
+ * support partitions (independ of actually having partitions created).
+ * Doing that is rather inconsistent, but changing it broke legacy
+ * udisks polling for legacy ide-cdrom devices. Use the crude check
+ * below to get the sane behavior for most device while not breaking
+ * userspace for this particular setup.
+ */
+ if (invalidate) {
+ if (disk_part_scan_enabled(disk) ||
+ !(disk->flags & GENHD_FL_REMOVABLE))
+ set_capacity(disk, 0);
+ }
+
+ if (get_capacity(disk)) {
+ ret = blk_add_partitions(disk, bdev);
+ if (ret == -EAGAIN)
+ goto rescan;
+ } else if (invalidate) {
+ /*
+ * Tell userspace that the media / partition table may have
+ * changed.
+ */
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+ }
+
+ return ret;
+}
+/*
+ * Only exported for loop and dasd for historic reasons. Don't use in new
+ * code!
+ */
+EXPORT_SYMBOL_GPL(bdev_disk_changed);
+
void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
{
struct address_space *mapping = state->bdev->bd_inode->i_mapping;