[lustre-discuss] EINVAL error when writing to a PFL file (lustre 2.12.0)

[LEIBOVICI Thomas]

Hello Patrick,

Thank you for the quick reply.
No, I have no particular use-case in mind, I'm just playing around with PFL.

If this is currently not properly supported, a quick fix could be to 
prevent the user from creating such incomplete layouts?

Regards,
Thomas

On 2/22/19 5:33 PM, Patrick Farrell wrote:
>
> Thomas,
>
>
> This is expected, but it's also something we'd like to fix - See LU-9341.
>
>
> Basically, append tries to instantiate the layout from 0 to infinity, 
> and it fails because your layout is incomplete (ie doesn't go to 
> infinity).
>
>
> May I ask why you're creating a file with an incomplete layout?  Do 
> you have a use case in mind?
>
>
> - Patrick
>
> ------------------------------------------------------------------------
> *From:* lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on 
> behalf of LEIBOVICI Thomas <thomas.leibovici at cea.fr>
> *Sent:* Friday, February 22, 2019 10:27:48 AM
> *To:* lustre-discuss at lists.lustre.org
> *Subject:* [lustre-discuss] EINVAL error when writing to a PFL file 
> (lustre 2.12.0)
> Hello,
>
> Is it expected to get an error when appending a PFL file made of 2
> regions [0 - 1M] and [1M to 6M]
> even if writing in this range?
>
> I get an error when appending it, even when writting in the very first
> bytes:
>
> [root at vm0]# lfs setstripe  -E 1M -c 1 -E 6M -c 2 /mnt/lustre/m_fou3
>
> [root at vm0]# lfs getstripe /mnt/lustre/m_fou3
> /mnt/lustre/m_fou3
>    lcm_layout_gen:    2
>    lcm_mirror_count:  1
>    lcm_entry_count:   2
>      lcme_id:             1
>      lcme_mirror_id:      0
>      lcme_flags:          init
>      lcme_extent.e_start: 0
>      lcme_extent.e_end:   1048576
>        lmm_stripe_count:  1
>        lmm_stripe_size:   1048576
>        lmm_pattern:       raid0
>        lmm_layout_gen:    0
>        lmm_stripe_offset: 3
>        lmm_objects:
>        - 0: { l_ost_idx: 3, l_fid: [0x100030000:0x9cf:0x0] }
>
>      lcme_id:             2
>      lcme_mirror_id:      0
>      lcme_flags:          0
>      lcme_extent.e_start: 1048576
>      lcme_extent.e_end:   6291456
>        lmm_stripe_count:  2
>        lmm_stripe_size:   1048576
>        lmm_pattern:       raid0
>        lmm_layout_gen:    0
>        lmm_stripe_offset: -1
>
> [root at vm0]# stat -c %s /mnt/lustre/m_fou3
> 14
>
> * append fails:
>
> [root at vm0]# echo qsdkjqslkdjkj >> /mnt/lustre/m_fou3
> bash: echo: write error: Invalid argument
>
> # strace indicates that write() gets the error:
>
> write(1, "qsdkjqslkdjkj\n", 14)         = -1 EINVAL (Invalid argument)
>
> * no error in case of an open/truncate:
>
> [root at vm0]# echo qsdkjqslkdjkj > /mnt/lustre/m_fou3
>
> OK
>
> Is it expected or should I open a ticket?
>
> Thomas
>
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