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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>
This commit is contained in:
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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5
fs/nfs/write.c
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@@ -1009,6 +1009,8 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
goto remove_req;
}
if (nfs_write_need_commit(hdr)) {
/* Reset wb_nio, since the write was successful. */
req->wb_nio = 0;
memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
nfs_mark_request_commit(req, hdr->lseg, &cinfo,
hdr->pgio_mirror_idx);
@@ -1142,6 +1144,7 @@ static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
req->wb_bytes = end - req->wb_offset;
else
req->wb_bytes = rqend - req->wb_offset;
req->wb_nio = 0;
return req;
out_flushme:
/*
@@ -1416,6 +1419,8 @@ static void nfs_initiate_write(struct nfs_pgio_header *hdr,
*/
static void nfs_redirty_request(struct nfs_page *req)
{
/* Bump the transmission count */
req->wb_nio++;
nfs_mark_request_dirty(req);
set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
nfs_end_page_writeback(req);