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nfs: add mirroring support to pgio layer

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This patch adds mirrored write support to the pgio layer. The default
is to use one mirror, but pgio callers may define callbacks to change
this to any value up to the (arbitrarily selected) limit of 16.

The basic idea is to break out members of nfs_pageio_descriptor that cannot
be shared between mirrored DSes and put them in a new structure.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
This commit is contained in:
Weston Andros Adamson
2014-09-19 10:55:07 -04:00
committed by Tom Haynes
parent b57ff1303a
commit a7d42ddb30
9 changed files with 311 additions and 67 deletions
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3
fs/nfs/objlayout/objio_osd.c
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@@ -537,11 +537,12 @@ int objio_write_pagelist(struct nfs_pgio_header *hdr, int how)
static size_t objio_pg_test(struct nfs_pageio_descriptor *pgio,
struct nfs_page *prev, struct nfs_page *req)
{
struct nfs_pgio_mirror *mirror = &pgio->pg_mirrors[pgio->pg_mirror_idx];
unsigned int size;
size = pnfs_generic_pg_test(pgio, prev, req);
if (!size || pgio->pg_count + req->wb_bytes >
if (!size || mirror->pg_count + req->wb_bytes >
(unsigned long)pgio->pg_layout_private)
return 0;