CIFS: Try to acquire credits at once for compound requests

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Currently we get one credit per compound part of the request
individually. This may lead to being stuck on waiting for credits
if multiple compounded operations happen in parallel. Try acquire
credits for all compound parts at once. Return immediately if not
enough credits and too few requests are in flight currently thus
narrowing the possibility of infinite waiting for credits.

The more advance fix is to return right away if not enough credits
for the compound request and do not look at the number of requests
in flight. The caller should handle such situations by falling back
to sequential execution of SMB commands instead of compounding.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

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Pavel Shilovsky 2019-01-30 16:58:09 -08:00 • committed by Steve French

parent fe768d51c8

commit 7091bcaba9

1 changed files with 34 additions and 5 deletions

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fs/cifs/transport.c

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