f2fs: Fix zoned block device support
The introduction of the multi-device feature partially broke the support for zoned block devices. In the function f2fs_scan_devices, sbi->devs allocation and initialization is skipped in the case of a single device mount. This result in no device information structure being allocated for the device. This is fine if the device is a regular device, but in the case of a zoned block device, the device zone type array is not initialized, which causes the function __f2fs_issue_discard_zone to fail as get_blkz_type is unable to determine the zone type of a section. Fix this by always allocating and initializing the sbi->devs device information array even in the case of a single device if that device is zoned. For this particular case, make sure to obtain a reference on the single device so that the call to blkdev_put() in destroy_device_list operates as expected. Fixes: 3c62be17 ("f2fs: support multiple devices") Cc: <stable@vger.kernel.org> # v4.10 Signed-off-by: NMasato Suzuki <masato.suzuki@wdc.com> Acked-by: NDamien Le Moal <damien.lemoal@wdc.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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