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nfs: use > 1 request to handle bsize < PAGE_SIZE 

Use the newly added support for multiple requests per page for
rsize/wsize < PAGE_SIZE, instead of having multiple read / write
data structures per pageio header.

This allows us to get rid of nfs_pgio_multi.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Weston Andros Adamson 2014-05-15 11:56:52 -04:00 committed by Trond Myklebust
parent 0f9c429eca
commit f0cb9ab8d5
1 changed files with 11 additions and 69 deletions
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78
fs/nfs/pagelist.c
View File

@ -443,21 +443,13 @@ nfs_wait_on_request(struct nfs_page *req)
size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
struct nfs_page *prev, struct nfs_page *req)
{
if (!prev)
return req->wb_bytes;
/*
* FIXME: ideally we should be able to coalesce all requests
* that are not block boundary aligned, but currently this
* is problematic for the case of bsize < PAGE_CACHE_SIZE,
* since nfs_flush_multi and nfs_pagein_multi assume you
* can have only one struct nfs_page.
*/
if (desc->pg_bsize < PAGE_SIZE)
if (desc->pg_count > desc->pg_bsize) {
/* should never happen */
WARN_ON_ONCE(1);
return 0;
}
if (desc->pg_count + req->wb_bytes <= desc->pg_bsize)
return req->wb_bytes;
return 0;
return min(desc->pg_bsize - desc->pg_count, (size_t)req->wb_bytes);
}
EXPORT_SYMBOL_GPL(nfs_generic_pg_test);
@ -765,50 +757,6 @@ static void nfs_pgio_result(struct rpc_task *task, void *calldata)
data->header->rw_ops->rw_result(task, data);
}
/*
* Generate multiple small requests to read or write a single
* contiguous dirty on one page.
*/
static int nfs_pgio_multi(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
struct nfs_page *req = hdr->req;
struct page *page = req->wb_page;
struct nfs_pgio_data *data;
size_t wsize = desc->pg_bsize, nbytes;
unsigned int offset;
int requests = 0;
struct nfs_commit_info cinfo;
nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
(desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
desc->pg_count > wsize))
desc->pg_ioflags &= ~FLUSH_COND_STABLE;
offset = 0;
nbytes = desc->pg_count;
do {
size_t len = min(nbytes, wsize);
data = nfs_pgio_data_alloc(hdr, 1);
if (!data)
return nfs_pgio_error(desc, hdr);
data->pages.pagevec[0] = page;
nfs_pgio_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
list_add(&data->list, &hdr->rpc_list);
requests++;
nbytes -= len;
offset += len;
} while (nbytes != 0);
nfs_list_remove_request(req);
nfs_list_add_request(req, &hdr->pages);
desc->pg_rpc_callops = &nfs_pgio_common_ops;
return 0;
}
/*
* Create an RPC task for the given read or write request and kick it.
* The page must have been locked by the caller.
@ -817,7 +765,7 @@ static int nfs_pgio_multi(struct nfs_pageio_descriptor *desc,
* This is the case if nfs_updatepage detects a conflicting request
* that has been written but not committed.
*/
static int nfs_pgio_one(struct nfs_pageio_descriptor *desc,
int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
struct nfs_page *req;
@ -850,6 +798,7 @@ static int nfs_pgio_one(struct nfs_pageio_descriptor *desc,
desc->pg_rpc_callops = &nfs_pgio_common_ops;
return 0;
}
EXPORT_SYMBOL_GPL(nfs_generic_pgio);
static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
{
@ -875,15 +824,6 @@ static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
return ret;
}
int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
if (desc->pg_bsize < PAGE_CACHE_SIZE)
return nfs_pgio_multi(desc, hdr);
return nfs_pgio_one(desc, hdr);
}
EXPORT_SYMBOL_GPL(nfs_generic_pgio);
static bool nfs_match_open_context(const struct nfs_open_context *ctx1,
const struct nfs_open_context *ctx2)
{
@ -925,7 +865,9 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
return false;
}
size = pgio->pg_ops->pg_test(pgio, prev, req);
WARN_ON_ONCE(size && size != req->wb_bytes);
WARN_ON_ONCE(size > req->wb_bytes);
if (size && size < req->wb_bytes)
req->wb_bytes = size;
return size > 0;
}