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tcmur: fix check_iovec_length #481

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tcmur: fix check_iovec_length #481

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Commits on Sep 29, 2018

  1. tcmur: fix check_iovec_length 

    readsector0 checker for multipath is not working, and the log like:

[DEBUG_SCSI_CMD] tcmu_print_cdb_info:1069 glfs/block0: 28 0 0 0 0 0 0 0 1 0
[ERROR] check_lba_and_length:107: iov len mismatch: iov len 4096, xfer len 1, block size 512
check_lba_and_length:107: iov len mismatch: iov len 4096, xfer len 1, block size 512

This is because in kernel space the sg->length is aligned to the
page size, and also the ringbufer data area's block size. So here
we need to make sure that the iov len is not less than the scsi
command's require.

Signed-off-by: Xiubo Li <[email protected]>
    @lxbsz
    lxbsz committed Sep 29, 2018
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