From 278c023a99b0d6b471d0f4a79835c703482e29ac Mon Sep 17 00:00:00 2001 From: Boaz Harrosh Date: Mon, 31 Oct 2011 15:16:54 -0700 Subject: [PATCH] pnfs-obj: Support for RAID5 read-4-write interface. The ore need suplied a r4w_get_page/r4w_put_page API from Filesystem so it can get cache pages to read-into when writing parial stripes. Signed-off-by: Boaz Harrosh Signed-off-by: Trond Myklebust --- fs/nfs/objlayout/objio_osd.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c index 3161da6..c807ab9 100644 --- a/fs/nfs/objlayout/objio_osd.c +++ b/fs/nfs/objlayout/objio_osd.c @@ -459,6 +459,43 @@ static void _write_done(struct ore_io_state *ios, void *private) objlayout_write_done(&objios->oir, status, objios->sync); } +static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate) +{ + struct objio_state *objios = priv; + struct nfs_write_data *wdata = objios->oir.rpcdata; + pgoff_t index = offset / PAGE_SIZE; + struct page *page = find_get_page(wdata->inode->i_mapping, index); + + if (!page) { + page = find_or_create_page(wdata->inode->i_mapping, + index, GFP_NOFS); + if (unlikely(!page)) { + dprintk("%s: grab_cache_page Failed index=0x%lx\n", + __func__, index); + return NULL; + } + unlock_page(page); + } + if (PageDirty(page) || PageWriteback(page)) + *uptodate = true; + else + *uptodate = PageUptodate(page); + dprintk("%s: index=0x%lx uptodate=%d\n", __func__, index, *uptodate); + return page; +} + +static void __r4w_put_page(void *priv, struct page *page) +{ + dprintk("%s: index=0x%lx\n", __func__, page->index); + page_cache_release(page); + return; +} + +static const struct _ore_r4w_op _r4w_op = { + .get_page = &__r4w_get_page, + .put_page = &__r4w_put_page, +}; + int objio_write_pagelist(struct nfs_write_data *wdata, int how) { struct objio_state *objios; @@ -472,6 +509,7 @@ int objio_write_pagelist(struct nfs_write_data *wdata, int how) return ret; objios->sync = 0 != (how & FLUSH_SYNC); + objios->ios->r4w = &_r4w_op; if (!objios->sync) objios->ios->done = _write_done; -- 2.7.4