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pnfs-obj: Support for RAID5 read-4-write interface.

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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>
This commit is contained in:
Boaz Harrosh 2011-10-31 15:16:54 -07:00 committed by Trond Myklebust
parent 04291b628c
commit 278c023a99
1 changed files with 38 additions and 0 deletions
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38
fs/nfs/objlayout/objio_osd.c
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@ -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;