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authorZhihao Cheng <chengzhihao1@huawei.com>2019-06-14 20:18:48 +0800
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-06-16 12:27:15 +0200
commit68ddd0cf2afcf24aec1458fb3a2abdcf81917daa (patch)
tree7364360da58f6717320a67714eaf794b3184e9e1 /tests/unittests/sysfs_mock
parentd9ba215acdb7feddd7477470cc7c8498cb576f6b (diff)
ubi-tests: mkvol test: Checks return value 'ENOSPC' for 'ubi_mkvol'
UBI tests try to create too many volumes in mkvol_bad and mkvol_basic. Currently mtd-utils allows return value 'ENFILE' from 'ubi_mkvol', that works fine in most situations. But what if the number of PEBs equals to the maximum count of volumes? For example, mkvol_basic test will fail in a 64MiB flash with 512KiB PEB size. Following is the output of mkvol_basic test: ====================================================================== ====================================================================== ====================================================================== Test on mtdram, fastmap enabled, VID header offset factor 1 ====================================================================== ====================================================================== ====================================================================== mtdram: 64MiB, PEB size 512KiB, fastmap enabled Running mkvol_basic /dev/ubi0 [mkvol_basic] mkvol_multiple():182: function ubi_mkvol() failed with error 28 (No space left on device) [mkvol_basic] mkvol_multiple():183: vol_id 122 Error: mkvol_basic failed FAILURE The reason is that there is no available PEB to support a new volume. We can see following verbose in dmesg: ubi0: attached mtd0 (name "mtdram test device", size 64 MiB) ubi0: user volume: 0, internal volumes: 1, max. volumes count: 128 ubi0: available PEBs: 122, total reserved PEBs: 6, PEBs reserved for bad PEB handling: 0 The maximum count of volumes is 128, so we can create 128 volumes theoretically. But there are 122 available PEBs becauese of existence of reserved PEBs. In addition, a volume occupies at least one PEB. Actually, we can only create 122 volumes, Therefore, 'ubi_mkvol' returns 'ENOSPC' when mkvol_basic tries to create 123rd volume. And we can see corresponding error message in dmesg: ubi0 error: ubi_create_volume [ubi]: not enough PEBs, only 0 available ubi0 error: ubi_create_volume [ubi]: cannot create volume 122, error -28 So, 'ENOSPC' can happen before 'ENFILE' in flash with a small amount of PEBs. This patch checks return value 'ENOSPC' for 'ubi_mkvol' when mkvol test is trying to create too many volumes. ---------------------------------------- Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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