Hi folks,
we run into following issue:
on a client host we have two processes - A and B.
Process A opens a file and reads some data:
OPEN -> LAYOUTGET -> READ.
Notice, that layout has a roc set to true.
Process B opens the same file:
OPEN -> READ.
Client obviously re-used layout information.
Now, process A closes the file and as a result,
layout becomes invalid. Nevertheless, process B
still assumes that layout still valid:
I thinks this is the source of the problem:
fs/nfs/pnfs.c:
1074 list_for_each_entry(ctx, &nfsi->open_files, list) {
1075 state = ctx->state;
1076 /* Don't return layout if there is open file state */
1077 if (state != NULL && state->state != 0)
1078 goto out_noroc;
1079 }
1080
this is with 3.19. The RHEL7 kernel send yet another LAYOUTGET when the process A
closes the file.
Tigran.
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