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NFSv4.1: shift pnfs_update_layout locations

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Move the pnfs_update_layout call location to nfs_pageio_do_add_request().
Grab the lseg sent in the doio function to nfs_read_rpcsetup and attach
it to each nfs_read_data so it can be sent to the layout driver.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2011-03-01 01:34:15 +00:00 • committed by Trond Myklebust
parent 94ad1c80e2
commit bae724ef95
8 changed files with 52 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

40
fs/nfs/read.c
View file

@ -20,17 +20,17 @@
#include <linux/nfs_page.h>
#include <asm/system.h>
#include "pnfs.h"
#include "nfs4_fs.h"
#include "internal.h"
#include "iostat.h"
#include "fscache.h"
#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
static int nfs_pagein_multi(struct inode *, struct list_head *, unsigned int, size_t, int);
static int nfs_pagein_one(struct inode *, struct list_head *, unsigned int, size_t, int);
static int nfs_pagein_multi(struct inode *, struct list_head *, unsigned int, size_t, int, struct pnfs_layout_segment *);
static int nfs_pagein_one(struct inode *, struct list_head *, unsigned int, size_t, int, struct pnfs_layout_segment *);
static const struct rpc_call_ops nfs_read_partial_ops;
static const struct rpc_call_ops nfs_read_full_ops;
@ -69,6 +69,7 @@ void nfs_readdata_free(struct nfs_read_data *p)
static void nfs_readdata_release(struct nfs_read_data *rdata)
{
put_lseg(rdata->lseg);
put_nfs_open_context(rdata->args.context);
nfs_readdata_free(rdata);
}
@ -121,7 +122,6 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
len = nfs_page_length(page);
if (len == 0)
return nfs_return_empty_page(page);
pnfs_update_layout(inode, ctx, IOMODE_READ);
new = nfs_create_request(ctx, inode, page, 0, len);
if (IS_ERR(new)) {
unlock_page(page);
@ -132,9 +132,9 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
nfs_list_add_request(new, &one_request);
if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
nfs_pagein_multi(inode, &one_request, 1, len, 0);
nfs_pagein_multi(inode, &one_request, 1, len, 0, NULL);
else
nfs_pagein_one(inode, &one_request, 1, len, 0);
nfs_pagein_one(inode, &one_request, 1, len, 0, NULL);
return 0;
}
@ -160,7 +160,8 @@ static void nfs_readpage_release(struct nfs_page *req)
*/
static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
const struct rpc_call_ops *call_ops,
unsigned int count, unsigned int offset)
unsigned int count, unsigned int offset,
struct pnfs_layout_segment *lseg)
{
struct inode *inode = req->wb_context->path.dentry->d_inode;
int swap_flags = IS_SWAPFILE(inode) ? NFS_RPC_SWAPFLAGS : 0;
@ -183,6 +184,7 @@ static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
data->req = req;
data->inode = inode;
data->cred = msg.rpc_cred;
data->lseg = get_lseg(lseg);
data->args.fh = NFS_FH(inode);
data->args.offset = req_offset(req) + offset;
@ -240,7 +242,7 @@ nfs_async_read_error(struct list_head *head)
* won't see the new data until our attribute cache is updated. This is more
* or less conventional NFS client behavior.
*/
static int nfs_pagein_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags)
static int nfs_pagein_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags, struct pnfs_layout_segment *lseg)
{
struct nfs_page *req = nfs_list_entry(head->next);
struct page *page = req->wb_page;
@ -266,6 +268,8 @@ static int nfs_pagein_multi(struct inode *inode, struct list_head *head, unsigne
} while(nbytes != 0);
atomic_set(&req->wb_complete, requests);
/* We know lseg==NULL */
lseg = pnfs_update_layout(inode, req->wb_context, IOMODE_READ);
ClearPageError(page);
offset = 0;
nbytes = count;
@ -280,12 +284,13 @@ static int nfs_pagein_multi(struct inode *inode, struct list_head *head, unsigne
if (nbytes < rsize)
rsize = nbytes;
ret2 = nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
rsize, offset);
rsize, offset, lseg);
if (ret == 0)
ret = ret2;
offset += rsize;
nbytes -= rsize;
} while (nbytes != 0);
put_lseg(lseg);
return ret;
@ -300,7 +305,7 @@ out_bad:
return -ENOMEM;
}
static int nfs_pagein_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags)
static int nfs_pagein_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags, struct pnfs_layout_segment *lseg)
{
struct nfs_page *req;
struct page **pages;
@ -308,8 +313,10 @@ static int nfs_pagein_one(struct inode *inode, struct list_head *head, unsigned
int ret = -ENOMEM;
data = nfs_readdata_alloc(npages);
if (!data)
goto out_bad;
if (!data) {
nfs_async_read_error(head);
goto out;
}
pages = data->pagevec;
while (!list_empty(head)) {
@ -320,10 +327,12 @@ static int nfs_pagein_one(struct inode *inode, struct list_head *head, unsigned
*pages++ = req->wb_page;
}
req = nfs_list_entry(data->pages.next);
if ((!lseg) && list_is_singular(&data->pages))
lseg = pnfs_update_layout(inode, req->wb_context, IOMODE_READ);
return nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0);
out_bad:
nfs_async_read_error(head);
ret = nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0, lseg);
out:
put_lseg(lseg);
return ret;
}
@ -625,7 +634,6 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
if (ret == 0)
goto read_complete; /* all pages were read */
pnfs_update_layout(inode, desc.ctx, IOMODE_READ);
pnfs_pageio_init_read(&pgio, inode);
if (rsize < PAGE_CACHE_SIZE)
nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0);