pNFS: Add tracking to limit the number of pNFS retries

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When the client is reading or writing using pNFS, and hits an error
on the DS, then it typically sends a LAYOUTERROR and/or LAYOUTRETURN
to the MDS, before redirtying the failed pages, and going for a new
round of reads/writebacks. The problem is that if the server has no
way to fix the DS, then we may need a way to interrupt this loop
after a set number of attempts have been made.
This patch adds an optional module parameter that allows the admin
to specify how many times to retry the read/writeback process before
failing with a fatal error.
The default behaviour is to retry forever.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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Trond Myklebust 2019-04-07 13:59:08 -04:00 • committed by Anna Schumaker

parent 28b1d3f5a7

commit 33344e0f7e

5 changed files with 36 additions and 2 deletions

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4

include/linux/nfs_page.h

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