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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 <bharrosh@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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04291b628c
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1 changed files with 38 additions and 0 deletions
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@ -459,6 +459,43 @@ static void _write_done(struct ore_io_state *ios, void *private)
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objlayout_write_done(&objios->oir, status, objios->sync);
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}
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static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
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{
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struct objio_state *objios = priv;
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struct nfs_write_data *wdata = objios->oir.rpcdata;
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pgoff_t index = offset / PAGE_SIZE;
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struct page *page = find_get_page(wdata->inode->i_mapping, index);
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if (!page) {
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page = find_or_create_page(wdata->inode->i_mapping,
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index, GFP_NOFS);
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if (unlikely(!page)) {
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dprintk("%s: grab_cache_page Failed index=0x%lx\n",
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__func__, index);
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return NULL;
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}
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unlock_page(page);
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}
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if (PageDirty(page) || PageWriteback(page))
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*uptodate = true;
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else
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*uptodate = PageUptodate(page);
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dprintk("%s: index=0x%lx uptodate=%d\n", __func__, index, *uptodate);
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return page;
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}
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static void __r4w_put_page(void *priv, struct page *page)
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{
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dprintk("%s: index=0x%lx\n", __func__, page->index);
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page_cache_release(page);
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return;
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}
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static const struct _ore_r4w_op _r4w_op = {
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.get_page = &__r4w_get_page,
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.put_page = &__r4w_put_page,
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};
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int objio_write_pagelist(struct nfs_write_data *wdata, int how)
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{
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struct objio_state *objios;
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@ -472,6 +509,7 @@ int objio_write_pagelist(struct nfs_write_data *wdata, int how)
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return ret;
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objios->sync = 0 != (how & FLUSH_SYNC);
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objios->ios->r4w = &_r4w_op;
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if (!objios->sync)
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objios->ios->done = _write_done;
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