mirror of https://gitee.com/openkylin/linux.git
2016 lines
53 KiB
C
2016 lines
53 KiB
C
/*
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* linux/fs/nfs/write.c
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*
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* Write file data over NFS.
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*
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* Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/file.h>
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#include <linux/writeback.h>
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#include <linux/swap.h>
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#include <linux/migrate.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/nfs_page.h>
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#include <linux/backing-dev.h>
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#include <linux/export.h>
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#include <asm/uaccess.h>
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#include "delegation.h"
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#include "internal.h"
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#include "iostat.h"
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#include "nfs4_fs.h"
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#include "fscache.h"
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#include "pnfs.h"
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#include "nfstrace.h"
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#define NFSDBG_FACILITY NFSDBG_PAGECACHE
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#define MIN_POOL_WRITE (32)
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#define MIN_POOL_COMMIT (4)
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/*
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* Local function declarations
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*/
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static void nfs_redirty_request(struct nfs_page *req);
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static const struct rpc_call_ops nfs_commit_ops;
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static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
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static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
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static const struct nfs_rw_ops nfs_rw_write_ops;
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static void nfs_clear_request_commit(struct nfs_page *req);
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static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
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struct inode *inode);
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static struct nfs_page *
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nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
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struct page *page);
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static struct kmem_cache *nfs_wdata_cachep;
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static mempool_t *nfs_wdata_mempool;
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static struct kmem_cache *nfs_cdata_cachep;
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static mempool_t *nfs_commit_mempool;
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struct nfs_commit_data *nfs_commitdata_alloc(void)
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{
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struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
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if (p) {
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memset(p, 0, sizeof(*p));
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INIT_LIST_HEAD(&p->pages);
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}
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return p;
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}
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EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
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void nfs_commit_free(struct nfs_commit_data *p)
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{
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mempool_free(p, nfs_commit_mempool);
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}
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EXPORT_SYMBOL_GPL(nfs_commit_free);
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static struct nfs_pgio_header *nfs_writehdr_alloc(void)
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{
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struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
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if (p)
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memset(p, 0, sizeof(*p));
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return p;
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}
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static void nfs_writehdr_free(struct nfs_pgio_header *hdr)
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{
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mempool_free(hdr, nfs_wdata_mempool);
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}
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static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
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{
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ctx->error = error;
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smp_wmb();
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set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
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}
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/*
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* nfs_page_find_head_request_locked - find head request associated with @page
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*
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* must be called while holding the inode lock.
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*
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* returns matching head request with reference held, or NULL if not found.
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*/
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static struct nfs_page *
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nfs_page_find_head_request_locked(struct nfs_inode *nfsi, struct page *page)
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{
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struct nfs_page *req = NULL;
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if (PagePrivate(page))
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req = (struct nfs_page *)page_private(page);
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else if (unlikely(PageSwapCache(page)))
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req = nfs_page_search_commits_for_head_request_locked(nfsi,
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page);
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if (req) {
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WARN_ON_ONCE(req->wb_head != req);
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kref_get(&req->wb_kref);
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}
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return req;
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}
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/*
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* nfs_page_find_head_request - find head request associated with @page
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*
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* returns matching head request with reference held, or NULL if not found.
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*/
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static struct nfs_page *nfs_page_find_head_request(struct page *page)
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{
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struct inode *inode = page_file_mapping(page)->host;
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struct nfs_page *req = NULL;
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spin_lock(&inode->i_lock);
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req = nfs_page_find_head_request_locked(NFS_I(inode), page);
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spin_unlock(&inode->i_lock);
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return req;
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}
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/* Adjust the file length if we're writing beyond the end */
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static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
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{
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struct inode *inode = page_file_mapping(page)->host;
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loff_t end, i_size;
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pgoff_t end_index;
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spin_lock(&inode->i_lock);
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i_size = i_size_read(inode);
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end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
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if (i_size > 0 && page_file_index(page) < end_index)
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goto out;
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end = page_file_offset(page) + ((loff_t)offset+count);
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if (i_size >= end)
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goto out;
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i_size_write(inode, end);
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nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
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out:
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spin_unlock(&inode->i_lock);
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}
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/* A writeback failed: mark the page as bad, and invalidate the page cache */
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static void nfs_set_pageerror(struct page *page)
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{
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nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
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}
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/*
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* nfs_page_group_search_locked
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* @head - head request of page group
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* @page_offset - offset into page
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*
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* Search page group with head @head to find a request that contains the
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* page offset @page_offset.
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*
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* Returns a pointer to the first matching nfs request, or NULL if no
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* match is found.
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*
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* Must be called with the page group lock held
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*/
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static struct nfs_page *
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nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset)
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{
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struct nfs_page *req;
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WARN_ON_ONCE(head != head->wb_head);
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WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags));
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req = head;
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do {
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if (page_offset >= req->wb_pgbase &&
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page_offset < (req->wb_pgbase + req->wb_bytes))
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return req;
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req = req->wb_this_page;
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} while (req != head);
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return NULL;
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}
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/*
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* nfs_page_group_covers_page
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* @head - head request of page group
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*
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* Return true if the page group with head @head covers the whole page,
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* returns false otherwise
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*/
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static bool nfs_page_group_covers_page(struct nfs_page *req)
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{
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struct nfs_page *tmp;
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unsigned int pos = 0;
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unsigned int len = nfs_page_length(req->wb_page);
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nfs_page_group_lock(req, false);
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do {
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tmp = nfs_page_group_search_locked(req->wb_head, pos);
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if (tmp) {
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/* no way this should happen */
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WARN_ON_ONCE(tmp->wb_pgbase != pos);
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pos += tmp->wb_bytes - (pos - tmp->wb_pgbase);
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}
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} while (tmp && pos < len);
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nfs_page_group_unlock(req);
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WARN_ON_ONCE(pos > len);
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return pos == len;
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}
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/* We can set the PG_uptodate flag if we see that a write request
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* covers the full page.
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*/
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static void nfs_mark_uptodate(struct nfs_page *req)
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{
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if (PageUptodate(req->wb_page))
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return;
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if (!nfs_page_group_covers_page(req))
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return;
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SetPageUptodate(req->wb_page);
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}
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static int wb_priority(struct writeback_control *wbc)
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{
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int ret = 0;
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if (wbc->for_reclaim)
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return FLUSH_HIGHPRI | FLUSH_STABLE;
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if (wbc->sync_mode == WB_SYNC_ALL)
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ret = FLUSH_COND_STABLE;
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if (wbc->for_kupdate || wbc->for_background)
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ret |= FLUSH_LOWPRI;
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return ret;
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}
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/*
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* NFS congestion control
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*/
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int nfs_congestion_kb;
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#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
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#define NFS_CONGESTION_OFF_THRESH \
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(NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
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static void nfs_set_page_writeback(struct page *page)
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{
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struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host);
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int ret = test_set_page_writeback(page);
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WARN_ON_ONCE(ret != 0);
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if (atomic_long_inc_return(&nfss->writeback) >
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NFS_CONGESTION_ON_THRESH) {
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set_bdi_congested(&nfss->backing_dev_info,
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BLK_RW_ASYNC);
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}
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}
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static void nfs_end_page_writeback(struct nfs_page *req)
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{
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struct inode *inode = page_file_mapping(req->wb_page)->host;
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struct nfs_server *nfss = NFS_SERVER(inode);
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if (!nfs_page_group_sync_on_bit(req, PG_WB_END))
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return;
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end_page_writeback(req->wb_page);
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if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
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clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
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}
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/* nfs_page_group_clear_bits
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* @req - an nfs request
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* clears all page group related bits from @req
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*/
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static void
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nfs_page_group_clear_bits(struct nfs_page *req)
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{
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clear_bit(PG_TEARDOWN, &req->wb_flags);
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clear_bit(PG_UNLOCKPAGE, &req->wb_flags);
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clear_bit(PG_UPTODATE, &req->wb_flags);
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clear_bit(PG_WB_END, &req->wb_flags);
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clear_bit(PG_REMOVE, &req->wb_flags);
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}
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/*
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* nfs_unroll_locks_and_wait - unlock all newly locked reqs and wait on @req
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*
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* this is a helper function for nfs_lock_and_join_requests
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*
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* @inode - inode associated with request page group, must be holding inode lock
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* @head - head request of page group, must be holding head lock
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* @req - request that couldn't lock and needs to wait on the req bit lock
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* @nonblock - if true, don't actually wait
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*
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* NOTE: this must be called holding page_group bit lock and inode spin lock
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* and BOTH will be released before returning.
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*
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* returns 0 on success, < 0 on error.
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*/
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static int
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nfs_unroll_locks_and_wait(struct inode *inode, struct nfs_page *head,
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struct nfs_page *req, bool nonblock)
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__releases(&inode->i_lock)
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{
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struct nfs_page *tmp;
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int ret;
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/* relinquish all the locks successfully grabbed this run */
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for (tmp = head ; tmp != req; tmp = tmp->wb_this_page)
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nfs_unlock_request(tmp);
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WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags));
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/* grab a ref on the request that will be waited on */
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kref_get(&req->wb_kref);
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nfs_page_group_unlock(head);
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spin_unlock(&inode->i_lock);
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/* release ref from nfs_page_find_head_request_locked */
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nfs_release_request(head);
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if (!nonblock)
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ret = nfs_wait_on_request(req);
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else
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ret = -EAGAIN;
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nfs_release_request(req);
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return ret;
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}
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/*
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* nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests
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*
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* @destroy_list - request list (using wb_this_page) terminated by @old_head
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* @old_head - the old head of the list
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*
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* All subrequests must be locked and removed from all lists, so at this point
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* they are only "active" in this function, and possibly in nfs_wait_on_request
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* with a reference held by some other context.
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*/
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static void
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nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
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struct nfs_page *old_head)
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{
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while (destroy_list) {
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struct nfs_page *subreq = destroy_list;
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destroy_list = (subreq->wb_this_page == old_head) ?
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NULL : subreq->wb_this_page;
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WARN_ON_ONCE(old_head != subreq->wb_head);
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/* make sure old group is not used */
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subreq->wb_head = subreq;
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subreq->wb_this_page = subreq;
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/* subreq is now totally disconnected from page group or any
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* write / commit lists. last chance to wake any waiters */
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nfs_unlock_request(subreq);
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if (!test_bit(PG_TEARDOWN, &subreq->wb_flags)) {
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/* release ref on old head request */
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nfs_release_request(old_head);
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nfs_page_group_clear_bits(subreq);
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/* release the PG_INODE_REF reference */
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if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags))
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nfs_release_request(subreq);
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else
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WARN_ON_ONCE(1);
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} else {
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WARN_ON_ONCE(test_bit(PG_CLEAN, &subreq->wb_flags));
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/* zombie requests have already released the last
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* reference and were waiting on the rest of the
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* group to complete. Since it's no longer part of a
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* group, simply free the request */
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nfs_page_group_clear_bits(subreq);
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nfs_free_request(subreq);
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}
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}
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}
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/*
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* nfs_lock_and_join_requests - join all subreqs to the head req and return
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* a locked reference, cancelling any pending
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* operations for this page.
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*
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* @page - the page used to lookup the "page group" of nfs_page structures
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* @nonblock - if true, don't block waiting for request locks
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*
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* This function joins all sub requests to the head request by first
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* locking all requests in the group, cancelling any pending operations
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* and finally updating the head request to cover the whole range covered by
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* the (former) group. All subrequests are removed from any write or commit
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* lists, unlinked from the group and destroyed.
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*
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* Returns a locked, referenced pointer to the head request - which after
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* this call is guaranteed to be the only request associated with the page.
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* Returns NULL if no requests are found for @page, or a ERR_PTR if an
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* error was encountered.
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*/
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static struct nfs_page *
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nfs_lock_and_join_requests(struct page *page, bool nonblock)
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{
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struct inode *inode = page_file_mapping(page)->host;
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struct nfs_page *head, *subreq;
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struct nfs_page *destroy_list = NULL;
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unsigned int total_bytes;
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int ret;
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try_again:
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total_bytes = 0;
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WARN_ON_ONCE(destroy_list);
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spin_lock(&inode->i_lock);
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/*
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* A reference is taken only on the head request which acts as a
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* reference to the whole page group - the group will not be destroyed
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* until the head reference is released.
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*/
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head = nfs_page_find_head_request_locked(NFS_I(inode), page);
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if (!head) {
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spin_unlock(&inode->i_lock);
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return NULL;
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}
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/* holding inode lock, so always make a non-blocking call to try the
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* page group lock */
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ret = nfs_page_group_lock(head, true);
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if (ret < 0) {
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spin_unlock(&inode->i_lock);
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if (!nonblock && ret == -EAGAIN) {
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nfs_page_group_lock_wait(head);
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nfs_release_request(head);
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goto try_again;
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}
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nfs_release_request(head);
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return ERR_PTR(ret);
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}
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/* lock each request in the page group */
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subreq = head;
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do {
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/*
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* Subrequests are always contiguous, non overlapping
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* and in order - but may be repeated (mirrored writes).
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*/
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if (subreq->wb_offset == (head->wb_offset + total_bytes)) {
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/* keep track of how many bytes this group covers */
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total_bytes += subreq->wb_bytes;
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} else if (WARN_ON_ONCE(subreq->wb_offset < head->wb_offset ||
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((subreq->wb_offset + subreq->wb_bytes) >
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(head->wb_offset + total_bytes)))) {
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nfs_page_group_unlock(head);
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spin_unlock(&inode->i_lock);
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return ERR_PTR(-EIO);
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}
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if (!nfs_lock_request(subreq)) {
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/* releases page group bit lock and
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* inode spin lock and all references */
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ret = nfs_unroll_locks_and_wait(inode, head,
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subreq, nonblock);
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if (ret == 0)
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goto try_again;
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return ERR_PTR(ret);
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}
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subreq = subreq->wb_this_page;
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} while (subreq != head);
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/* Now that all requests are locked, make sure they aren't on any list.
|
|
* Commit list removal accounting is done after locks are dropped */
|
|
subreq = head;
|
|
do {
|
|
nfs_clear_request_commit(subreq);
|
|
subreq = subreq->wb_this_page;
|
|
} while (subreq != head);
|
|
|
|
/* unlink subrequests from head, destroy them later */
|
|
if (head->wb_this_page != head) {
|
|
/* destroy list will be terminated by head */
|
|
destroy_list = head->wb_this_page;
|
|
head->wb_this_page = head;
|
|
|
|
/* change head request to cover whole range that
|
|
* the former page group covered */
|
|
head->wb_bytes = total_bytes;
|
|
}
|
|
|
|
/*
|
|
* prepare head request to be added to new pgio descriptor
|
|
*/
|
|
nfs_page_group_clear_bits(head);
|
|
|
|
/*
|
|
* some part of the group was still on the inode list - otherwise
|
|
* the group wouldn't be involved in async write.
|
|
* grab a reference for the head request, iff it needs one.
|
|
*/
|
|
if (!test_and_set_bit(PG_INODE_REF, &head->wb_flags))
|
|
kref_get(&head->wb_kref);
|
|
|
|
nfs_page_group_unlock(head);
|
|
|
|
/* drop lock to clean uprequests on destroy list */
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
nfs_destroy_unlinked_subrequests(destroy_list, head);
|
|
|
|
/* still holds ref on head from nfs_page_find_head_request_locked
|
|
* and still has lock on head from lock loop */
|
|
return head;
|
|
}
|
|
|
|
/*
|
|
* Find an associated nfs write request, and prepare to flush it out
|
|
* May return an error if the user signalled nfs_wait_on_request().
|
|
*/
|
|
static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
|
|
struct page *page, bool nonblock)
|
|
{
|
|
struct nfs_page *req;
|
|
int ret = 0;
|
|
|
|
req = nfs_lock_and_join_requests(page, nonblock);
|
|
if (!req)
|
|
goto out;
|
|
ret = PTR_ERR(req);
|
|
if (IS_ERR(req))
|
|
goto out;
|
|
|
|
nfs_set_page_writeback(page);
|
|
WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
|
|
|
|
ret = 0;
|
|
if (!nfs_pageio_add_request(pgio, req)) {
|
|
nfs_redirty_request(req);
|
|
ret = pgio->pg_error;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
|
|
{
|
|
struct inode *inode = page_file_mapping(page)->host;
|
|
int ret;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
|
|
nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
|
|
|
|
nfs_pageio_cond_complete(pgio, page_file_index(page));
|
|
ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
|
|
if (ret == -EAGAIN) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Write an mmapped page to the server.
|
|
*/
|
|
static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
int err;
|
|
|
|
nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc),
|
|
false, &nfs_async_write_completion_ops);
|
|
err = nfs_do_writepage(page, wbc, &pgio);
|
|
nfs_pageio_complete(&pgio);
|
|
if (err < 0)
|
|
return err;
|
|
if (pgio.pg_error < 0)
|
|
return pgio.pg_error;
|
|
return 0;
|
|
}
|
|
|
|
int nfs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
int ret;
|
|
|
|
ret = nfs_writepage_locked(page, wbc);
|
|
unlock_page(page);
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
|
|
{
|
|
int ret;
|
|
|
|
ret = nfs_do_writepage(page, wbc, data);
|
|
unlock_page(page);
|
|
return ret;
|
|
}
|
|
|
|
int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
unsigned long *bitlock = &NFS_I(inode)->flags;
|
|
struct nfs_pageio_descriptor pgio;
|
|
int err;
|
|
|
|
/* Stop dirtying of new pages while we sync */
|
|
err = wait_on_bit_lock_action(bitlock, NFS_INO_FLUSHING,
|
|
nfs_wait_bit_killable, TASK_KILLABLE);
|
|
if (err)
|
|
goto out_err;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
|
|
|
|
nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
|
|
&nfs_async_write_completion_ops);
|
|
err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
|
|
nfs_pageio_complete(&pgio);
|
|
|
|
clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(bitlock, NFS_INO_FLUSHING);
|
|
|
|
if (err < 0)
|
|
goto out_err;
|
|
err = pgio.pg_error;
|
|
if (err < 0)
|
|
goto out_err;
|
|
return 0;
|
|
out_err:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Insert a write request into an inode
|
|
*/
|
|
static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
WARN_ON_ONCE(req->wb_this_page != req);
|
|
|
|
/* Lock the request! */
|
|
nfs_lock_request(req);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (!nfsi->nrequests &&
|
|
NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
|
|
inode->i_version++;
|
|
/*
|
|
* Swap-space should not get truncated. Hence no need to plug the race
|
|
* with invalidate/truncate.
|
|
*/
|
|
if (likely(!PageSwapCache(req->wb_page))) {
|
|
set_bit(PG_MAPPED, &req->wb_flags);
|
|
SetPagePrivate(req->wb_page);
|
|
set_page_private(req->wb_page, (unsigned long)req);
|
|
}
|
|
nfsi->nrequests++;
|
|
/* this a head request for a page group - mark it as having an
|
|
* extra reference so sub groups can follow suit.
|
|
* This flag also informs pgio layer when to bump nrequests when
|
|
* adding subrequests. */
|
|
WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
|
|
kref_get(&req->wb_kref);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/*
|
|
* Remove a write request from an inode
|
|
*/
|
|
static void nfs_inode_remove_request(struct nfs_page *req)
|
|
{
|
|
struct inode *inode = d_inode(req->wb_context->dentry);
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_page *head;
|
|
|
|
if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
|
|
head = req->wb_head;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (likely(!PageSwapCache(head->wb_page))) {
|
|
set_page_private(head->wb_page, 0);
|
|
ClearPagePrivate(head->wb_page);
|
|
smp_mb__after_atomic();
|
|
wake_up_page(head->wb_page, PG_private);
|
|
clear_bit(PG_MAPPED, &head->wb_flags);
|
|
}
|
|
nfsi->nrequests--;
|
|
spin_unlock(&inode->i_lock);
|
|
} else {
|
|
spin_lock(&inode->i_lock);
|
|
nfsi->nrequests--;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
|
|
nfs_release_request(req);
|
|
}
|
|
|
|
static void
|
|
nfs_mark_request_dirty(struct nfs_page *req)
|
|
{
|
|
__set_page_dirty_nobuffers(req->wb_page);
|
|
}
|
|
|
|
/*
|
|
* nfs_page_search_commits_for_head_request_locked
|
|
*
|
|
* Search through commit lists on @inode for the head request for @page.
|
|
* Must be called while holding the inode (which is cinfo) lock.
|
|
*
|
|
* Returns the head request if found, or NULL if not found.
|
|
*/
|
|
static struct nfs_page *
|
|
nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
|
|
struct page *page)
|
|
{
|
|
struct nfs_page *freq, *t;
|
|
struct nfs_commit_info cinfo;
|
|
struct inode *inode = &nfsi->vfs_inode;
|
|
|
|
nfs_init_cinfo_from_inode(&cinfo, inode);
|
|
|
|
/* search through pnfs commit lists */
|
|
freq = pnfs_search_commit_reqs(inode, &cinfo, page);
|
|
if (freq)
|
|
return freq->wb_head;
|
|
|
|
/* Linearly search the commit list for the correct request */
|
|
list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) {
|
|
if (freq->wb_page == page)
|
|
return freq->wb_head;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* nfs_request_add_commit_list - add request to a commit list
|
|
* @req: pointer to a struct nfs_page
|
|
* @dst: commit list head
|
|
* @cinfo: holds list lock and accounting info
|
|
*
|
|
* This sets the PG_CLEAN bit, updates the cinfo count of
|
|
* number of outstanding requests requiring a commit as well as
|
|
* the MM page stats.
|
|
*
|
|
* The caller must _not_ hold the cinfo->lock, but must be
|
|
* holding the nfs_page lock.
|
|
*/
|
|
void
|
|
nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
set_bit(PG_CLEAN, &(req)->wb_flags);
|
|
spin_lock(cinfo->lock);
|
|
nfs_list_add_request(req, dst);
|
|
cinfo->mds->ncommit++;
|
|
spin_unlock(cinfo->lock);
|
|
if (!cinfo->dreq)
|
|
nfs_mark_page_unstable(req->wb_page);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
|
|
|
|
/**
|
|
* nfs_request_remove_commit_list - Remove request from a commit list
|
|
* @req: pointer to a nfs_page
|
|
* @cinfo: holds list lock and accounting info
|
|
*
|
|
* This clears the PG_CLEAN bit, and updates the cinfo's count of
|
|
* number of outstanding requests requiring a commit
|
|
* It does not update the MM page stats.
|
|
*
|
|
* The caller _must_ hold the cinfo->lock and the nfs_page lock.
|
|
*/
|
|
void
|
|
nfs_request_remove_commit_list(struct nfs_page *req,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
|
|
return;
|
|
nfs_list_remove_request(req);
|
|
cinfo->mds->ncommit--;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
|
|
|
|
static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
|
|
struct inode *inode)
|
|
{
|
|
cinfo->lock = &inode->i_lock;
|
|
cinfo->mds = &NFS_I(inode)->commit_info;
|
|
cinfo->ds = pnfs_get_ds_info(inode);
|
|
cinfo->dreq = NULL;
|
|
cinfo->completion_ops = &nfs_commit_completion_ops;
|
|
}
|
|
|
|
void nfs_init_cinfo(struct nfs_commit_info *cinfo,
|
|
struct inode *inode,
|
|
struct nfs_direct_req *dreq)
|
|
{
|
|
if (dreq)
|
|
nfs_init_cinfo_from_dreq(cinfo, dreq);
|
|
else
|
|
nfs_init_cinfo_from_inode(cinfo, inode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_init_cinfo);
|
|
|
|
/*
|
|
* Add a request to the inode's commit list.
|
|
*/
|
|
void
|
|
nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo, u32 ds_commit_idx)
|
|
{
|
|
if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx))
|
|
return;
|
|
nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
|
|
}
|
|
|
|
static void
|
|
nfs_clear_page_commit(struct page *page)
|
|
{
|
|
dec_zone_page_state(page, NR_UNSTABLE_NFS);
|
|
dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
|
|
WB_RECLAIMABLE);
|
|
}
|
|
|
|
/* Called holding inode (/cinfo) lock */
|
|
static void
|
|
nfs_clear_request_commit(struct nfs_page *req)
|
|
{
|
|
if (test_bit(PG_CLEAN, &req->wb_flags)) {
|
|
struct inode *inode = d_inode(req->wb_context->dentry);
|
|
struct nfs_commit_info cinfo;
|
|
|
|
nfs_init_cinfo_from_inode(&cinfo, inode);
|
|
if (!pnfs_clear_request_commit(req, &cinfo)) {
|
|
nfs_request_remove_commit_list(req, &cinfo);
|
|
}
|
|
nfs_clear_page_commit(req->wb_page);
|
|
}
|
|
}
|
|
|
|
int nfs_write_need_commit(struct nfs_pgio_header *hdr)
|
|
{
|
|
if (hdr->verf.committed == NFS_DATA_SYNC)
|
|
return hdr->lseg == NULL;
|
|
return hdr->verf.committed != NFS_FILE_SYNC;
|
|
}
|
|
|
|
static void nfs_write_completion(struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_commit_info cinfo;
|
|
unsigned long bytes = 0;
|
|
|
|
if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
|
|
goto out;
|
|
nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
|
|
while (!list_empty(&hdr->pages)) {
|
|
struct nfs_page *req = nfs_list_entry(hdr->pages.next);
|
|
|
|
bytes += req->wb_bytes;
|
|
nfs_list_remove_request(req);
|
|
if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
|
|
(hdr->good_bytes < bytes)) {
|
|
nfs_set_pageerror(req->wb_page);
|
|
nfs_context_set_write_error(req->wb_context, hdr->error);
|
|
goto remove_req;
|
|
}
|
|
if (nfs_write_need_commit(hdr)) {
|
|
memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
|
|
nfs_mark_request_commit(req, hdr->lseg, &cinfo,
|
|
hdr->pgio_mirror_idx);
|
|
goto next;
|
|
}
|
|
remove_req:
|
|
nfs_inode_remove_request(req);
|
|
next:
|
|
nfs_unlock_request(req);
|
|
nfs_end_page_writeback(req);
|
|
nfs_release_request(req);
|
|
}
|
|
out:
|
|
hdr->release(hdr);
|
|
}
|
|
|
|
unsigned long
|
|
nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
|
|
{
|
|
return cinfo->mds->ncommit;
|
|
}
|
|
|
|
/* cinfo->lock held by caller */
|
|
int
|
|
nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
|
|
struct nfs_commit_info *cinfo, int max)
|
|
{
|
|
struct nfs_page *req, *tmp;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry_safe(req, tmp, src, wb_list) {
|
|
if (!nfs_lock_request(req))
|
|
continue;
|
|
kref_get(&req->wb_kref);
|
|
if (cond_resched_lock(cinfo->lock))
|
|
list_safe_reset_next(req, tmp, wb_list);
|
|
nfs_request_remove_commit_list(req, cinfo);
|
|
nfs_list_add_request(req, dst);
|
|
ret++;
|
|
if ((ret == max) && !cinfo->dreq)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* nfs_scan_commit - Scan an inode for commit requests
|
|
* @inode: NFS inode to scan
|
|
* @dst: mds destination list
|
|
* @cinfo: mds and ds lists of reqs ready to commit
|
|
*
|
|
* Moves requests from the inode's 'commit' request list.
|
|
* The requests are *not* checked to ensure that they form a contiguous set.
|
|
*/
|
|
int
|
|
nfs_scan_commit(struct inode *inode, struct list_head *dst,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
int ret = 0;
|
|
|
|
spin_lock(cinfo->lock);
|
|
if (cinfo->mds->ncommit > 0) {
|
|
const int max = INT_MAX;
|
|
|
|
ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
|
|
cinfo, max);
|
|
ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
|
|
}
|
|
spin_unlock(cinfo->lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Search for an existing write request, and attempt to update
|
|
* it to reflect a new dirty region on a given page.
|
|
*
|
|
* If the attempt fails, then the existing request is flushed out
|
|
* to disk.
|
|
*/
|
|
static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
|
|
struct page *page,
|
|
unsigned int offset,
|
|
unsigned int bytes)
|
|
{
|
|
struct nfs_page *req;
|
|
unsigned int rqend;
|
|
unsigned int end;
|
|
int error;
|
|
|
|
if (!PagePrivate(page))
|
|
return NULL;
|
|
|
|
end = offset + bytes;
|
|
spin_lock(&inode->i_lock);
|
|
|
|
for (;;) {
|
|
req = nfs_page_find_head_request_locked(NFS_I(inode), page);
|
|
if (req == NULL)
|
|
goto out_unlock;
|
|
|
|
/* should be handled by nfs_flush_incompatible */
|
|
WARN_ON_ONCE(req->wb_head != req);
|
|
WARN_ON_ONCE(req->wb_this_page != req);
|
|
|
|
rqend = req->wb_offset + req->wb_bytes;
|
|
/*
|
|
* Tell the caller to flush out the request if
|
|
* the offsets are non-contiguous.
|
|
* Note: nfs_flush_incompatible() will already
|
|
* have flushed out requests having wrong owners.
|
|
*/
|
|
if (offset > rqend
|
|
|| end < req->wb_offset)
|
|
goto out_flushme;
|
|
|
|
if (nfs_lock_request(req))
|
|
break;
|
|
|
|
/* The request is locked, so wait and then retry */
|
|
spin_unlock(&inode->i_lock);
|
|
error = nfs_wait_on_request(req);
|
|
nfs_release_request(req);
|
|
if (error != 0)
|
|
goto out_err;
|
|
spin_lock(&inode->i_lock);
|
|
}
|
|
|
|
/* Okay, the request matches. Update the region */
|
|
if (offset < req->wb_offset) {
|
|
req->wb_offset = offset;
|
|
req->wb_pgbase = offset;
|
|
}
|
|
if (end > rqend)
|
|
req->wb_bytes = end - req->wb_offset;
|
|
else
|
|
req->wb_bytes = rqend - req->wb_offset;
|
|
out_unlock:
|
|
if (req)
|
|
nfs_clear_request_commit(req);
|
|
spin_unlock(&inode->i_lock);
|
|
return req;
|
|
out_flushme:
|
|
spin_unlock(&inode->i_lock);
|
|
nfs_release_request(req);
|
|
error = nfs_wb_page(inode, page);
|
|
out_err:
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/*
|
|
* Try to update an existing write request, or create one if there is none.
|
|
*
|
|
* Note: Should always be called with the Page Lock held to prevent races
|
|
* if we have to add a new request. Also assumes that the caller has
|
|
* already called nfs_flush_incompatible() if necessary.
|
|
*/
|
|
static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
|
|
struct page *page, unsigned int offset, unsigned int bytes)
|
|
{
|
|
struct inode *inode = page_file_mapping(page)->host;
|
|
struct nfs_page *req;
|
|
|
|
req = nfs_try_to_update_request(inode, page, offset, bytes);
|
|
if (req != NULL)
|
|
goto out;
|
|
req = nfs_create_request(ctx, page, NULL, offset, bytes);
|
|
if (IS_ERR(req))
|
|
goto out;
|
|
nfs_inode_add_request(inode, req);
|
|
out:
|
|
return req;
|
|
}
|
|
|
|
static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
|
|
unsigned int offset, unsigned int count)
|
|
{
|
|
struct nfs_page *req;
|
|
|
|
req = nfs_setup_write_request(ctx, page, offset, count);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
/* Update file length */
|
|
nfs_grow_file(page, offset, count);
|
|
nfs_mark_uptodate(req);
|
|
nfs_mark_request_dirty(req);
|
|
nfs_unlock_and_release_request(req);
|
|
return 0;
|
|
}
|
|
|
|
int nfs_flush_incompatible(struct file *file, struct page *page)
|
|
{
|
|
struct nfs_open_context *ctx = nfs_file_open_context(file);
|
|
struct nfs_lock_context *l_ctx;
|
|
struct file_lock_context *flctx = file_inode(file)->i_flctx;
|
|
struct nfs_page *req;
|
|
int do_flush, status;
|
|
/*
|
|
* Look for a request corresponding to this page. If there
|
|
* is one, and it belongs to another file, we flush it out
|
|
* before we try to copy anything into the page. Do this
|
|
* due to the lack of an ACCESS-type call in NFSv2.
|
|
* Also do the same if we find a request from an existing
|
|
* dropped page.
|
|
*/
|
|
do {
|
|
req = nfs_page_find_head_request(page);
|
|
if (req == NULL)
|
|
return 0;
|
|
l_ctx = req->wb_lock_context;
|
|
do_flush = req->wb_page != page || req->wb_context != ctx;
|
|
/* for now, flush if more than 1 request in page_group */
|
|
do_flush |= req->wb_this_page != req;
|
|
if (l_ctx && flctx &&
|
|
!(list_empty_careful(&flctx->flc_posix) &&
|
|
list_empty_careful(&flctx->flc_flock))) {
|
|
do_flush |= l_ctx->lockowner.l_owner != current->files
|
|
|| l_ctx->lockowner.l_pid != current->tgid;
|
|
}
|
|
nfs_release_request(req);
|
|
if (!do_flush)
|
|
return 0;
|
|
status = nfs_wb_page(page_file_mapping(page)->host, page);
|
|
} while (status == 0);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Avoid buffered writes when a open context credential's key would
|
|
* expire soon.
|
|
*
|
|
* Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL.
|
|
*
|
|
* Return 0 and set a credential flag which triggers the inode to flush
|
|
* and performs NFS_FILE_SYNC writes if the key will expired within
|
|
* RPC_KEY_EXPIRE_TIMEO.
|
|
*/
|
|
int
|
|
nfs_key_timeout_notify(struct file *filp, struct inode *inode)
|
|
{
|
|
struct nfs_open_context *ctx = nfs_file_open_context(filp);
|
|
struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth;
|
|
|
|
return rpcauth_key_timeout_notify(auth, ctx->cred);
|
|
}
|
|
|
|
/*
|
|
* Test if the open context credential key is marked to expire soon.
|
|
*/
|
|
bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx)
|
|
{
|
|
return rpcauth_cred_key_to_expire(ctx->cred);
|
|
}
|
|
|
|
/*
|
|
* If the page cache is marked as unsafe or invalid, then we can't rely on
|
|
* the PageUptodate() flag. In this case, we will need to turn off
|
|
* write optimisations that depend on the page contents being correct.
|
|
*/
|
|
static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
if (nfs_have_delegated_attributes(inode))
|
|
goto out;
|
|
if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
|
|
return false;
|
|
smp_rmb();
|
|
if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags))
|
|
return false;
|
|
out:
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
|
|
return false;
|
|
return PageUptodate(page) != 0;
|
|
}
|
|
|
|
static bool
|
|
is_whole_file_wrlock(struct file_lock *fl)
|
|
{
|
|
return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX &&
|
|
fl->fl_type == F_WRLCK;
|
|
}
|
|
|
|
/* If we know the page is up to date, and we're not using byte range locks (or
|
|
* if we have the whole file locked for writing), it may be more efficient to
|
|
* extend the write to cover the entire page in order to avoid fragmentation
|
|
* inefficiencies.
|
|
*
|
|
* If the file is opened for synchronous writes then we can just skip the rest
|
|
* of the checks.
|
|
*/
|
|
static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
|
|
{
|
|
int ret;
|
|
struct file_lock_context *flctx = inode->i_flctx;
|
|
struct file_lock *fl;
|
|
|
|
if (file->f_flags & O_DSYNC)
|
|
return 0;
|
|
if (!nfs_write_pageuptodate(page, inode))
|
|
return 0;
|
|
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
|
|
return 1;
|
|
if (!flctx || (list_empty_careful(&flctx->flc_flock) &&
|
|
list_empty_careful(&flctx->flc_posix)))
|
|
return 0;
|
|
|
|
/* Check to see if there are whole file write locks */
|
|
ret = 0;
|
|
spin_lock(&flctx->flc_lock);
|
|
if (!list_empty(&flctx->flc_posix)) {
|
|
fl = list_first_entry(&flctx->flc_posix, struct file_lock,
|
|
fl_list);
|
|
if (is_whole_file_wrlock(fl))
|
|
ret = 1;
|
|
} else if (!list_empty(&flctx->flc_flock)) {
|
|
fl = list_first_entry(&flctx->flc_flock, struct file_lock,
|
|
fl_list);
|
|
if (fl->fl_type == F_WRLCK)
|
|
ret = 1;
|
|
}
|
|
spin_unlock(&flctx->flc_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Update and possibly write a cached page of an NFS file.
|
|
*
|
|
* XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
|
|
* things with a page scheduled for an RPC call (e.g. invalidate it).
|
|
*/
|
|
int nfs_updatepage(struct file *file, struct page *page,
|
|
unsigned int offset, unsigned int count)
|
|
{
|
|
struct nfs_open_context *ctx = nfs_file_open_context(file);
|
|
struct inode *inode = page_file_mapping(page)->host;
|
|
int status = 0;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
|
|
|
|
dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n",
|
|
file, count, (long long)(page_file_offset(page) + offset));
|
|
|
|
if (nfs_can_extend_write(file, page, inode)) {
|
|
count = max(count + offset, nfs_page_length(page));
|
|
offset = 0;
|
|
}
|
|
|
|
status = nfs_writepage_setup(ctx, page, offset, count);
|
|
if (status < 0)
|
|
nfs_set_pageerror(page);
|
|
else
|
|
__set_page_dirty_nobuffers(page);
|
|
|
|
dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
|
|
status, (long long)i_size_read(inode));
|
|
return status;
|
|
}
|
|
|
|
static int flush_task_priority(int how)
|
|
{
|
|
switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
|
|
case FLUSH_HIGHPRI:
|
|
return RPC_PRIORITY_HIGH;
|
|
case FLUSH_LOWPRI:
|
|
return RPC_PRIORITY_LOW;
|
|
}
|
|
return RPC_PRIORITY_NORMAL;
|
|
}
|
|
|
|
static void nfs_initiate_write(struct nfs_pgio_header *hdr,
|
|
struct rpc_message *msg,
|
|
const struct nfs_rpc_ops *rpc_ops,
|
|
struct rpc_task_setup *task_setup_data, int how)
|
|
{
|
|
int priority = flush_task_priority(how);
|
|
|
|
task_setup_data->priority = priority;
|
|
rpc_ops->write_setup(hdr, msg);
|
|
|
|
nfs4_state_protect_write(NFS_SERVER(hdr->inode)->nfs_client,
|
|
&task_setup_data->rpc_client, msg, hdr);
|
|
}
|
|
|
|
/* If a nfs_flush_* function fails, it should remove reqs from @head and
|
|
* call this on each, which will prepare them to be retried on next
|
|
* writeback using standard nfs.
|
|
*/
|
|
static void nfs_redirty_request(struct nfs_page *req)
|
|
{
|
|
nfs_mark_request_dirty(req);
|
|
set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
|
|
nfs_unlock_request(req);
|
|
nfs_end_page_writeback(req);
|
|
nfs_release_request(req);
|
|
}
|
|
|
|
static void nfs_async_write_error(struct list_head *head)
|
|
{
|
|
struct nfs_page *req;
|
|
|
|
while (!list_empty(head)) {
|
|
req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_redirty_request(req);
|
|
}
|
|
}
|
|
|
|
static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
|
|
.error_cleanup = nfs_async_write_error,
|
|
.completion = nfs_write_completion,
|
|
};
|
|
|
|
void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
|
|
struct inode *inode, int ioflags, bool force_mds,
|
|
const struct nfs_pgio_completion_ops *compl_ops)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops;
|
|
|
|
#ifdef CONFIG_NFS_V4_1
|
|
if (server->pnfs_curr_ld && !force_mds)
|
|
pg_ops = server->pnfs_curr_ld->pg_write_ops;
|
|
#endif
|
|
nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops,
|
|
server->wsize, ioflags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
|
|
|
|
void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
|
|
{
|
|
struct nfs_pgio_mirror *mirror;
|
|
|
|
pgio->pg_ops = &nfs_pgio_rw_ops;
|
|
|
|
nfs_pageio_stop_mirroring(pgio);
|
|
|
|
mirror = &pgio->pg_mirrors[0];
|
|
mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
|
|
|
|
|
|
void nfs_commit_prepare(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_commit_data *data = calldata;
|
|
|
|
NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
|
|
}
|
|
|
|
/*
|
|
* Special version of should_remove_suid() that ignores capabilities.
|
|
*/
|
|
static int nfs_should_remove_suid(const struct inode *inode)
|
|
{
|
|
umode_t mode = inode->i_mode;
|
|
int kill = 0;
|
|
|
|
/* suid always must be killed */
|
|
if (unlikely(mode & S_ISUID))
|
|
kill = ATTR_KILL_SUID;
|
|
|
|
/*
|
|
* sgid without any exec bits is just a mandatory locking mark; leave
|
|
* it alone. If some exec bits are set, it's a real sgid; kill it.
|
|
*/
|
|
if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
|
|
kill |= ATTR_KILL_SGID;
|
|
|
|
if (unlikely(kill && S_ISREG(mode)))
|
|
return kill;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr,
|
|
struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_pgio_args *argp = &hdr->args;
|
|
struct nfs_pgio_res *resp = &hdr->res;
|
|
|
|
if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
|
|
return;
|
|
if (argp->offset + resp->count != fattr->size)
|
|
return;
|
|
if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode))
|
|
return;
|
|
/* Set attribute barrier */
|
|
nfs_fattr_set_barrier(fattr);
|
|
}
|
|
|
|
void nfs_writeback_update_inode(struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_fattr *fattr = hdr->res.fattr;
|
|
struct inode *inode = hdr->inode;
|
|
|
|
if (fattr == NULL)
|
|
return;
|
|
spin_lock(&inode->i_lock);
|
|
nfs_writeback_check_extend(hdr, fattr);
|
|
nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_writeback_update_inode);
|
|
|
|
/*
|
|
* This function is called when the WRITE call is complete.
|
|
*/
|
|
static int nfs_writeback_done(struct rpc_task *task,
|
|
struct nfs_pgio_header *hdr,
|
|
struct inode *inode)
|
|
{
|
|
int status;
|
|
|
|
/*
|
|
* ->write_done will attempt to use post-op attributes to detect
|
|
* conflicting writes by other clients. A strict interpretation
|
|
* of close-to-open would allow us to continue caching even if
|
|
* another writer had changed the file, but some applications
|
|
* depend on tighter cache coherency when writing.
|
|
*/
|
|
status = NFS_PROTO(inode)->write_done(task, hdr);
|
|
if (status != 0)
|
|
return status;
|
|
nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count);
|
|
|
|
if (hdr->res.verf->committed < hdr->args.stable &&
|
|
task->tk_status >= 0) {
|
|
/* We tried a write call, but the server did not
|
|
* commit data to stable storage even though we
|
|
* requested it.
|
|
* Note: There is a known bug in Tru64 < 5.0 in which
|
|
* the server reports NFS_DATA_SYNC, but performs
|
|
* NFS_FILE_SYNC. We therefore implement this checking
|
|
* as a dprintk() in order to avoid filling syslog.
|
|
*/
|
|
static unsigned long complain;
|
|
|
|
/* Note this will print the MDS for a DS write */
|
|
if (time_before(complain, jiffies)) {
|
|
dprintk("NFS: faulty NFS server %s:"
|
|
" (committed = %d) != (stable = %d)\n",
|
|
NFS_SERVER(inode)->nfs_client->cl_hostname,
|
|
hdr->res.verf->committed, hdr->args.stable);
|
|
complain = jiffies + 300 * HZ;
|
|
}
|
|
}
|
|
|
|
/* Deal with the suid/sgid bit corner case */
|
|
if (nfs_should_remove_suid(inode))
|
|
nfs_mark_for_revalidate(inode);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function is called when the WRITE call is complete.
|
|
*/
|
|
static void nfs_writeback_result(struct rpc_task *task,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_pgio_args *argp = &hdr->args;
|
|
struct nfs_pgio_res *resp = &hdr->res;
|
|
|
|
if (resp->count < argp->count) {
|
|
static unsigned long complain;
|
|
|
|
/* This a short write! */
|
|
nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE);
|
|
|
|
/* Has the server at least made some progress? */
|
|
if (resp->count == 0) {
|
|
if (time_before(complain, jiffies)) {
|
|
printk(KERN_WARNING
|
|
"NFS: Server wrote zero bytes, expected %u.\n",
|
|
argp->count);
|
|
complain = jiffies + 300 * HZ;
|
|
}
|
|
nfs_set_pgio_error(hdr, -EIO, argp->offset);
|
|
task->tk_status = -EIO;
|
|
return;
|
|
}
|
|
/* Was this an NFSv2 write or an NFSv3 stable write? */
|
|
if (resp->verf->committed != NFS_UNSTABLE) {
|
|
/* Resend from where the server left off */
|
|
hdr->mds_offset += resp->count;
|
|
argp->offset += resp->count;
|
|
argp->pgbase += resp->count;
|
|
argp->count -= resp->count;
|
|
} else {
|
|
/* Resend as a stable write in order to avoid
|
|
* headaches in the case of a server crash.
|
|
*/
|
|
argp->stable = NFS_FILE_SYNC;
|
|
}
|
|
rpc_restart_call_prepare(task);
|
|
}
|
|
}
|
|
|
|
|
|
static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
|
|
{
|
|
int ret;
|
|
|
|
if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
|
|
return 1;
|
|
if (!may_wait)
|
|
return 0;
|
|
ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
|
|
NFS_INO_COMMIT,
|
|
nfs_wait_bit_killable,
|
|
TASK_KILLABLE);
|
|
return (ret < 0) ? ret : 1;
|
|
}
|
|
|
|
static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
|
|
{
|
|
clear_bit(NFS_INO_COMMIT, &nfsi->flags);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
|
|
}
|
|
|
|
void nfs_commitdata_release(struct nfs_commit_data *data)
|
|
{
|
|
put_nfs_open_context(data->context);
|
|
nfs_commit_free(data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_commitdata_release);
|
|
|
|
int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
|
|
const struct nfs_rpc_ops *nfs_ops,
|
|
const struct rpc_call_ops *call_ops,
|
|
int how, int flags)
|
|
{
|
|
struct rpc_task *task;
|
|
int priority = flush_task_priority(how);
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &data->args,
|
|
.rpc_resp = &data->res,
|
|
.rpc_cred = data->cred,
|
|
};
|
|
struct rpc_task_setup task_setup_data = {
|
|
.task = &data->task,
|
|
.rpc_client = clnt,
|
|
.rpc_message = &msg,
|
|
.callback_ops = call_ops,
|
|
.callback_data = data,
|
|
.workqueue = nfsiod_workqueue,
|
|
.flags = RPC_TASK_ASYNC | flags,
|
|
.priority = priority,
|
|
};
|
|
/* Set up the initial task struct. */
|
|
nfs_ops->commit_setup(data, &msg);
|
|
|
|
dprintk("NFS: initiated commit call\n");
|
|
|
|
nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client,
|
|
NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg);
|
|
|
|
task = rpc_run_task(&task_setup_data);
|
|
if (IS_ERR(task))
|
|
return PTR_ERR(task);
|
|
if (how & FLUSH_SYNC)
|
|
rpc_wait_for_completion_task(task);
|
|
rpc_put_task(task);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_initiate_commit);
|
|
|
|
static loff_t nfs_get_lwb(struct list_head *head)
|
|
{
|
|
loff_t lwb = 0;
|
|
struct nfs_page *req;
|
|
|
|
list_for_each_entry(req, head, wb_list)
|
|
if (lwb < (req_offset(req) + req->wb_bytes))
|
|
lwb = req_offset(req) + req->wb_bytes;
|
|
|
|
return lwb;
|
|
}
|
|
|
|
/*
|
|
* Set up the argument/result storage required for the RPC call.
|
|
*/
|
|
void nfs_init_commit(struct nfs_commit_data *data,
|
|
struct list_head *head,
|
|
struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
struct nfs_page *first = nfs_list_entry(head->next);
|
|
struct inode *inode = d_inode(first->wb_context->dentry);
|
|
|
|
/* Set up the RPC argument and reply structs
|
|
* NB: take care not to mess about with data->commit et al. */
|
|
|
|
list_splice_init(head, &data->pages);
|
|
|
|
data->inode = inode;
|
|
data->cred = first->wb_context->cred;
|
|
data->lseg = lseg; /* reference transferred */
|
|
/* only set lwb for pnfs commit */
|
|
if (lseg)
|
|
data->lwb = nfs_get_lwb(&data->pages);
|
|
data->mds_ops = &nfs_commit_ops;
|
|
data->completion_ops = cinfo->completion_ops;
|
|
data->dreq = cinfo->dreq;
|
|
|
|
data->args.fh = NFS_FH(data->inode);
|
|
/* Note: we always request a commit of the entire inode */
|
|
data->args.offset = 0;
|
|
data->args.count = 0;
|
|
data->context = get_nfs_open_context(first->wb_context);
|
|
data->res.fattr = &data->fattr;
|
|
data->res.verf = &data->verf;
|
|
nfs_fattr_init(&data->fattr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_init_commit);
|
|
|
|
void nfs_retry_commit(struct list_head *page_list,
|
|
struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo,
|
|
u32 ds_commit_idx)
|
|
{
|
|
struct nfs_page *req;
|
|
|
|
while (!list_empty(page_list)) {
|
|
req = nfs_list_entry(page_list->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx);
|
|
if (!cinfo->dreq)
|
|
nfs_clear_page_commit(req->wb_page);
|
|
nfs_unlock_and_release_request(req);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_retry_commit);
|
|
|
|
/*
|
|
* Commit dirty pages
|
|
*/
|
|
static int
|
|
nfs_commit_list(struct inode *inode, struct list_head *head, int how,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
struct nfs_commit_data *data;
|
|
|
|
data = nfs_commitdata_alloc();
|
|
|
|
if (!data)
|
|
goto out_bad;
|
|
|
|
/* Set up the argument struct */
|
|
nfs_init_commit(data, head, NULL, cinfo);
|
|
atomic_inc(&cinfo->mds->rpcs_out);
|
|
return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode),
|
|
data->mds_ops, how, 0);
|
|
out_bad:
|
|
nfs_retry_commit(head, NULL, cinfo, 0);
|
|
cinfo->completion_ops->error_cleanup(NFS_I(inode));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* COMMIT call returned
|
|
*/
|
|
static void nfs_commit_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_commit_data *data = calldata;
|
|
|
|
dprintk("NFS: %5u nfs_commit_done (status %d)\n",
|
|
task->tk_pid, task->tk_status);
|
|
|
|
/* Call the NFS version-specific code */
|
|
NFS_PROTO(data->inode)->commit_done(task, data);
|
|
}
|
|
|
|
static void nfs_commit_release_pages(struct nfs_commit_data *data)
|
|
{
|
|
struct nfs_page *req;
|
|
int status = data->task.tk_status;
|
|
struct nfs_commit_info cinfo;
|
|
struct nfs_server *nfss;
|
|
|
|
while (!list_empty(&data->pages)) {
|
|
req = nfs_list_entry(data->pages.next);
|
|
nfs_list_remove_request(req);
|
|
nfs_clear_page_commit(req->wb_page);
|
|
|
|
dprintk("NFS: commit (%s/%llu %d@%lld)",
|
|
req->wb_context->dentry->d_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(d_inode(req->wb_context->dentry)),
|
|
req->wb_bytes,
|
|
(long long)req_offset(req));
|
|
if (status < 0) {
|
|
nfs_context_set_write_error(req->wb_context, status);
|
|
nfs_inode_remove_request(req);
|
|
dprintk(", error = %d\n", status);
|
|
goto next;
|
|
}
|
|
|
|
/* Okay, COMMIT succeeded, apparently. Check the verifier
|
|
* returned by the server against all stored verfs. */
|
|
if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) {
|
|
/* We have a match */
|
|
nfs_inode_remove_request(req);
|
|
dprintk(" OK\n");
|
|
goto next;
|
|
}
|
|
/* We have a mismatch. Write the page again */
|
|
dprintk(" mismatch\n");
|
|
nfs_mark_request_dirty(req);
|
|
set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
|
|
next:
|
|
nfs_unlock_and_release_request(req);
|
|
}
|
|
nfss = NFS_SERVER(data->inode);
|
|
if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
|
|
clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
|
|
|
|
nfs_init_cinfo(&cinfo, data->inode, data->dreq);
|
|
if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
|
|
nfs_commit_clear_lock(NFS_I(data->inode));
|
|
}
|
|
|
|
static void nfs_commit_release(void *calldata)
|
|
{
|
|
struct nfs_commit_data *data = calldata;
|
|
|
|
data->completion_ops->completion(data);
|
|
nfs_commitdata_release(calldata);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_commit_ops = {
|
|
.rpc_call_prepare = nfs_commit_prepare,
|
|
.rpc_call_done = nfs_commit_done,
|
|
.rpc_release = nfs_commit_release,
|
|
};
|
|
|
|
static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
|
|
.completion = nfs_commit_release_pages,
|
|
.error_cleanup = nfs_commit_clear_lock,
|
|
};
|
|
|
|
int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
|
|
int how, struct nfs_commit_info *cinfo)
|
|
{
|
|
int status;
|
|
|
|
status = pnfs_commit_list(inode, head, how, cinfo);
|
|
if (status == PNFS_NOT_ATTEMPTED)
|
|
status = nfs_commit_list(inode, head, how, cinfo);
|
|
return status;
|
|
}
|
|
|
|
int nfs_commit_inode(struct inode *inode, int how)
|
|
{
|
|
LIST_HEAD(head);
|
|
struct nfs_commit_info cinfo;
|
|
int may_wait = how & FLUSH_SYNC;
|
|
int res;
|
|
|
|
res = nfs_commit_set_lock(NFS_I(inode), may_wait);
|
|
if (res <= 0)
|
|
goto out_mark_dirty;
|
|
nfs_init_cinfo_from_inode(&cinfo, inode);
|
|
res = nfs_scan_commit(inode, &head, &cinfo);
|
|
if (res) {
|
|
int error;
|
|
|
|
error = nfs_generic_commit_list(inode, &head, how, &cinfo);
|
|
if (error < 0)
|
|
return error;
|
|
if (!may_wait)
|
|
goto out_mark_dirty;
|
|
error = wait_on_bit_action(&NFS_I(inode)->flags,
|
|
NFS_INO_COMMIT,
|
|
nfs_wait_bit_killable,
|
|
TASK_KILLABLE);
|
|
if (error < 0)
|
|
return error;
|
|
} else
|
|
nfs_commit_clear_lock(NFS_I(inode));
|
|
return res;
|
|
/* Note: If we exit without ensuring that the commit is complete,
|
|
* we must mark the inode as dirty. Otherwise, future calls to
|
|
* sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
|
|
* that the data is on the disk.
|
|
*/
|
|
out_mark_dirty:
|
|
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
|
|
return res;
|
|
}
|
|
|
|
static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int flags = FLUSH_SYNC;
|
|
int ret = 0;
|
|
|
|
/* no commits means nothing needs to be done */
|
|
if (!nfsi->commit_info.ncommit)
|
|
return ret;
|
|
|
|
if (wbc->sync_mode == WB_SYNC_NONE) {
|
|
/* Don't commit yet if this is a non-blocking flush and there
|
|
* are a lot of outstanding writes for this mapping.
|
|
*/
|
|
if (nfsi->commit_info.ncommit <= (nfsi->nrequests >> 1))
|
|
goto out_mark_dirty;
|
|
|
|
/* don't wait for the COMMIT response */
|
|
flags = 0;
|
|
}
|
|
|
|
ret = nfs_commit_inode(inode, flags);
|
|
if (ret >= 0) {
|
|
if (wbc->sync_mode == WB_SYNC_NONE) {
|
|
if (ret < wbc->nr_to_write)
|
|
wbc->nr_to_write -= ret;
|
|
else
|
|
wbc->nr_to_write = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
out_mark_dirty:
|
|
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
|
|
return ret;
|
|
}
|
|
|
|
int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
return nfs_commit_unstable_pages(inode, wbc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_write_inode);
|
|
|
|
/*
|
|
* flush the inode to disk.
|
|
*/
|
|
int nfs_wb_all(struct inode *inode)
|
|
{
|
|
int ret;
|
|
|
|
trace_nfs_writeback_inode_enter(inode);
|
|
|
|
ret = filemap_write_and_wait(inode->i_mapping);
|
|
if (ret)
|
|
goto out;
|
|
ret = nfs_commit_inode(inode, FLUSH_SYNC);
|
|
if (ret < 0)
|
|
goto out;
|
|
pnfs_sync_inode(inode, true);
|
|
ret = 0;
|
|
|
|
out:
|
|
trace_nfs_writeback_inode_exit(inode, ret);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_wb_all);
|
|
|
|
int nfs_wb_page_cancel(struct inode *inode, struct page *page)
|
|
{
|
|
struct nfs_page *req;
|
|
int ret = 0;
|
|
|
|
wait_on_page_writeback(page);
|
|
|
|
/* blocking call to cancel all requests and join to a single (head)
|
|
* request */
|
|
req = nfs_lock_and_join_requests(page, false);
|
|
|
|
if (IS_ERR(req)) {
|
|
ret = PTR_ERR(req);
|
|
} else if (req) {
|
|
/* all requests from this page have been cancelled by
|
|
* nfs_lock_and_join_requests, so just remove the head
|
|
* request from the inode / page_private pointer and
|
|
* release it */
|
|
nfs_inode_remove_request(req);
|
|
nfs_unlock_and_release_request(req);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Write back all requests on one page - we do this before reading it.
|
|
*/
|
|
int nfs_wb_page(struct inode *inode, struct page *page)
|
|
{
|
|
loff_t range_start = page_file_offset(page);
|
|
loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
|
|
struct writeback_control wbc = {
|
|
.sync_mode = WB_SYNC_ALL,
|
|
.nr_to_write = 0,
|
|
.range_start = range_start,
|
|
.range_end = range_end,
|
|
};
|
|
int ret;
|
|
|
|
trace_nfs_writeback_page_enter(inode);
|
|
|
|
for (;;) {
|
|
wait_on_page_writeback(page);
|
|
if (clear_page_dirty_for_io(page)) {
|
|
ret = nfs_writepage_locked(page, &wbc);
|
|
if (ret < 0)
|
|
goto out_error;
|
|
continue;
|
|
}
|
|
ret = 0;
|
|
if (!PagePrivate(page))
|
|
break;
|
|
ret = nfs_commit_inode(inode, FLUSH_SYNC);
|
|
if (ret < 0)
|
|
goto out_error;
|
|
}
|
|
out_error:
|
|
trace_nfs_writeback_page_exit(inode, ret);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
|
|
struct page *page, enum migrate_mode mode)
|
|
{
|
|
/*
|
|
* If PagePrivate is set, then the page is currently associated with
|
|
* an in-progress read or write request. Don't try to migrate it.
|
|
*
|
|
* FIXME: we could do this in principle, but we'll need a way to ensure
|
|
* that we can safely release the inode reference while holding
|
|
* the page lock.
|
|
*/
|
|
if (PagePrivate(page))
|
|
return -EBUSY;
|
|
|
|
if (!nfs_fscache_release_page(page, GFP_KERNEL))
|
|
return -EBUSY;
|
|
|
|
return migrate_page(mapping, newpage, page, mode);
|
|
}
|
|
#endif
|
|
|
|
int __init nfs_init_writepagecache(void)
|
|
{
|
|
nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
|
|
sizeof(struct nfs_pgio_header),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (nfs_wdata_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
|
|
nfs_wdata_cachep);
|
|
if (nfs_wdata_mempool == NULL)
|
|
goto out_destroy_write_cache;
|
|
|
|
nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
|
|
sizeof(struct nfs_commit_data),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (nfs_cdata_cachep == NULL)
|
|
goto out_destroy_write_mempool;
|
|
|
|
nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
|
|
nfs_cdata_cachep);
|
|
if (nfs_commit_mempool == NULL)
|
|
goto out_destroy_commit_cache;
|
|
|
|
/*
|
|
* NFS congestion size, scale with available memory.
|
|
*
|
|
* 64MB: 8192k
|
|
* 128MB: 11585k
|
|
* 256MB: 16384k
|
|
* 512MB: 23170k
|
|
* 1GB: 32768k
|
|
* 2GB: 46340k
|
|
* 4GB: 65536k
|
|
* 8GB: 92681k
|
|
* 16GB: 131072k
|
|
*
|
|
* This allows larger machines to have larger/more transfers.
|
|
* Limit the default to 256M
|
|
*/
|
|
nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
|
|
if (nfs_congestion_kb > 256*1024)
|
|
nfs_congestion_kb = 256*1024;
|
|
|
|
return 0;
|
|
|
|
out_destroy_commit_cache:
|
|
kmem_cache_destroy(nfs_cdata_cachep);
|
|
out_destroy_write_mempool:
|
|
mempool_destroy(nfs_wdata_mempool);
|
|
out_destroy_write_cache:
|
|
kmem_cache_destroy(nfs_wdata_cachep);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void nfs_destroy_writepagecache(void)
|
|
{
|
|
mempool_destroy(nfs_commit_mempool);
|
|
kmem_cache_destroy(nfs_cdata_cachep);
|
|
mempool_destroy(nfs_wdata_mempool);
|
|
kmem_cache_destroy(nfs_wdata_cachep);
|
|
}
|
|
|
|
static const struct nfs_rw_ops nfs_rw_write_ops = {
|
|
.rw_mode = FMODE_WRITE,
|
|
.rw_alloc_header = nfs_writehdr_alloc,
|
|
.rw_free_header = nfs_writehdr_free,
|
|
.rw_done = nfs_writeback_done,
|
|
.rw_result = nfs_writeback_result,
|
|
.rw_initiate = nfs_initiate_write,
|
|
};
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