blocklayout.c (6f018efac14eb267d3ba0aa4294594b556147dba) blocklayout.c (6296556f0b31eaff29f2a3aee2c17b7eae895b98)
1/*
2 * linux/fs/nfs/blocklayout/blocklayout.c
3 *
4 * Module for the NFSv4.1 pNFS block layout driver.
5 *
6 * Copyright (c) 2006 The Regents of the University of Michigan.
7 * All rights reserved.
8 *

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32
33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/bio.h> /* struct bio */
38#include <linux/buffer_head.h> /* various write calls */
39#include <linux/prefetch.h>
1/*
2 * linux/fs/nfs/blocklayout/blocklayout.c
3 *
4 * Module for the NFSv4.1 pNFS block layout driver.
5 *
6 * Copyright (c) 2006 The Regents of the University of Michigan.
7 * All rights reserved.
8 *

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32
33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/bio.h> /* struct bio */
38#include <linux/buffer_head.h> /* various write calls */
39#include <linux/prefetch.h>
40#include <linux/pagevec.h>
40
41#include "../pnfs.h"
42#include "../internal.h"
43#include "blocklayout.h"
44
45#define NFSDBG_FACILITY NFSDBG_PNFS_LD
46
47MODULE_LICENSE("GPL");

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1199{
1200 if (pgio->pg_dreq != NULL &&
1201 !is_aligned_req(req, SECTOR_SIZE))
1202 return false;
1203
1204 return pnfs_generic_pg_test(pgio, prev, req);
1205}
1206
41
42#include "../pnfs.h"
43#include "../internal.h"
44#include "blocklayout.h"
45
46#define NFSDBG_FACILITY NFSDBG_PNFS_LD
47
48MODULE_LICENSE("GPL");

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1200{
1201 if (pgio->pg_dreq != NULL &&
1202 !is_aligned_req(req, SECTOR_SIZE))
1203 return false;
1204
1205 return pnfs_generic_pg_test(pgio, prev, req);
1206}
1207
1208/*
1209 * Return the number of contiguous bytes for a given inode
1210 * starting at page frame idx.
1211 */
1212static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx)
1213{
1214 struct address_space *mapping = inode->i_mapping;
1215 pgoff_t end;
1216
1217 /* Optimize common case that writes from 0 to end of file */
1218 end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE);
1219 if (end != NFS_I(inode)->npages) {
1220 rcu_read_lock();
1221 end = radix_tree_next_hole(&mapping->page_tree, idx + 1, ULONG_MAX);
1222 rcu_read_unlock();
1223 }
1224
1225 if (!end)
1226 return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT);
1227 else
1228 return (end - idx) << PAGE_CACHE_SHIFT;
1229}
1230
1207static void
1208bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1209{
1210 if (pgio->pg_dreq != NULL &&
1231static void
1232bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1233{
1234 if (pgio->pg_dreq != NULL &&
1211 !is_aligned_req(req, PAGE_CACHE_SIZE))
1235 !is_aligned_req(req, PAGE_CACHE_SIZE)) {
1212 nfs_pageio_reset_write_mds(pgio);
1236 nfs_pageio_reset_write_mds(pgio);
1213 else
1214 pnfs_generic_pg_init_write(pgio, req);
1237 } else {
1238 u64 wb_size;
1239 if (pgio->pg_dreq == NULL)
1240 wb_size = pnfs_num_cont_bytes(pgio->pg_inode,
1241 req->wb_index);
1242 else
1243 wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1244
1245 pnfs_generic_pg_init_write(pgio, req, wb_size);
1246 }
1215}
1216
1217static bool
1218bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1219 struct nfs_page *req)
1220{
1221 if (pgio->pg_dreq != NULL &&
1222 !is_aligned_req(req, PAGE_CACHE_SIZE))

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1248
1249static bool
1250bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1251 struct nfs_page *req)
1252{
1253 if (pgio->pg_dreq != NULL &&
1254 !is_aligned_req(req, PAGE_CACHE_SIZE))

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