![Trond Myklebust](/assets/img/avatar_default.png)
ClearPageUptodate() will just cause races here. What we really want to do is to invalidate the page cache. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1527 lines
38 KiB
C
1527 lines
38 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/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 <asm/uaccess.h>
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#include <linux/smp_lock.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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#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 struct nfs_page * nfs_update_request(struct nfs_open_context*,
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struct page *,
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unsigned int, unsigned int);
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static void nfs_mark_request_dirty(struct nfs_page *req);
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static int nfs_wait_on_write_congestion(struct address_space *, int);
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static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how);
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static const struct rpc_call_ops nfs_write_partial_ops;
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static const struct rpc_call_ops nfs_write_full_ops;
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static const struct rpc_call_ops nfs_commit_ops;
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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 mempool_t *nfs_commit_mempool;
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static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion);
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struct nfs_write_data *nfs_commit_alloc(void)
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{
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struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
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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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void nfs_commit_rcu_free(struct rcu_head *head)
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{
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struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
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if (p && (p->pagevec != &p->page_array[0]))
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kfree(p->pagevec);
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mempool_free(p, nfs_commit_mempool);
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}
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void nfs_commit_free(struct nfs_write_data *wdata)
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{
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call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free);
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}
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struct nfs_write_data *nfs_writedata_alloc(size_t len)
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{
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unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
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struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
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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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p->npages = pagecount;
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if (pagecount <= ARRAY_SIZE(p->page_array))
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p->pagevec = p->page_array;
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else {
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p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
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if (!p->pagevec) {
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mempool_free(p, nfs_wdata_mempool);
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p = NULL;
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}
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}
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}
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return p;
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}
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static void nfs_writedata_rcu_free(struct rcu_head *head)
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{
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struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
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if (p && (p->pagevec != &p->page_array[0]))
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kfree(p->pagevec);
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mempool_free(p, nfs_wdata_mempool);
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}
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static void nfs_writedata_free(struct nfs_write_data *wdata)
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{
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call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free);
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}
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void nfs_writedata_release(void *wdata)
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{
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nfs_writedata_free(wdata);
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}
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static struct nfs_page *nfs_page_find_request_locked(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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if (req != NULL)
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atomic_inc(&req->wb_count);
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}
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return req;
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}
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static struct nfs_page *nfs_page_find_request(struct page *page)
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{
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struct nfs_page *req = NULL;
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spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
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spin_lock(req_lock);
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req = nfs_page_find_request_locked(page);
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spin_unlock(req_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->mapping->host;
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loff_t end, i_size = i_size_read(inode);
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unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
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if (i_size > 0 && page->index < end_index)
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return;
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end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
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if (i_size >= end)
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return;
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nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
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i_size_write(inode, end);
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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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SetPageError(page);
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nfs_zap_mapping(page->mapping->host, page->mapping);
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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 page *page, unsigned int base, unsigned int count)
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{
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if (PageUptodate(page))
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return;
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if (base != 0)
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return;
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if (count != nfs_page_length(page))
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return;
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if (count != PAGE_CACHE_SIZE)
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memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count);
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SetPageUptodate(page);
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}
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static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
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unsigned int offset, unsigned int count)
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{
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struct nfs_page *req;
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int ret;
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for (;;) {
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req = nfs_update_request(ctx, page, offset, count);
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if (!IS_ERR(req))
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break;
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ret = PTR_ERR(req);
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if (ret != -EBUSY)
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return ret;
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ret = nfs_wb_page(page->mapping->host, page);
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if (ret != 0)
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return ret;
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}
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/* Update file length */
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nfs_grow_file(page, offset, count);
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/* Set the PG_uptodate flag? */
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nfs_mark_uptodate(page, offset, count);
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nfs_unlock_request(req);
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return 0;
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}
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static int wb_priority(struct writeback_control *wbc)
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{
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if (wbc->for_reclaim)
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return FLUSH_HIGHPRI;
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if (wbc->for_kupdate)
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return FLUSH_LOWPRI;
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return 0;
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}
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/*
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* Find an associated nfs write request, and prepare to flush it out
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* Returns 1 if there was no write request, or if the request was
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* already tagged by nfs_set_page_dirty.Returns 0 if the request
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* was not tagged.
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* May also return an error if the user signalled nfs_wait_on_request().
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*/
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static int nfs_page_mark_flush(struct page *page)
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{
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struct nfs_page *req;
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spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
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int ret;
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spin_lock(req_lock);
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for(;;) {
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req = nfs_page_find_request_locked(page);
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if (req == NULL) {
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spin_unlock(req_lock);
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return 1;
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}
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if (nfs_lock_request_dontget(req))
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break;
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/* Note: If we hold the page lock, as is the case in nfs_writepage,
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* then the call to nfs_lock_request_dontget() will always
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* succeed provided that someone hasn't already marked the
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* request as dirty (in which case we don't care).
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*/
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spin_unlock(req_lock);
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ret = nfs_wait_on_request(req);
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nfs_release_request(req);
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if (ret != 0)
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return ret;
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spin_lock(req_lock);
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}
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spin_unlock(req_lock);
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if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) {
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nfs_mark_request_dirty(req);
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set_page_writeback(page);
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}
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ret = test_bit(PG_NEED_FLUSH, &req->wb_flags);
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nfs_unlock_request(req);
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return ret;
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}
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/*
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* Write an mmapped page to the server.
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*/
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static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
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{
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struct nfs_open_context *ctx;
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struct inode *inode = page->mapping->host;
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unsigned offset;
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int err;
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nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
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nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
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err = nfs_page_mark_flush(page);
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if (err <= 0)
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goto out;
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err = 0;
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offset = nfs_page_length(page);
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if (!offset)
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goto out;
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ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE);
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if (ctx == NULL) {
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err = -EBADF;
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goto out;
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}
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err = nfs_writepage_setup(ctx, page, 0, offset);
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put_nfs_open_context(ctx);
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if (err != 0)
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goto out;
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err = nfs_page_mark_flush(page);
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if (err > 0)
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err = 0;
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out:
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if (!wbc->for_writepages)
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nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|wb_priority(wbc));
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return err;
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}
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int nfs_writepage(struct page *page, struct writeback_control *wbc)
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{
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int err;
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err = nfs_writepage_locked(page, wbc);
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unlock_page(page);
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return err;
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}
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/*
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* Note: causes nfs_update_request() to block on the assumption
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* that the writeback is generated due to memory pressure.
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*/
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int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
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{
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struct backing_dev_info *bdi = mapping->backing_dev_info;
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struct inode *inode = mapping->host;
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int err;
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nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
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err = generic_writepages(mapping, wbc);
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if (err)
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return err;
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while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) {
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if (wbc->nonblocking)
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return 0;
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nfs_wait_on_write_congestion(mapping, 0);
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}
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err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc));
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if (err < 0)
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goto out;
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nfs_add_stats(inode, NFSIOS_WRITEPAGES, err);
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err = 0;
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out:
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clear_bit(BDI_write_congested, &bdi->state);
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wake_up_all(&nfs_write_congestion);
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congestion_end(WRITE);
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return err;
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}
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/*
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* Insert a write request into an inode
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*/
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static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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int error;
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error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
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BUG_ON(error == -EEXIST);
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if (error)
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return error;
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if (!nfsi->npages) {
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igrab(inode);
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nfs_begin_data_update(inode);
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if (nfs_have_delegation(inode, FMODE_WRITE))
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nfsi->change_attr++;
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}
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SetPagePrivate(req->wb_page);
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set_page_private(req->wb_page, (unsigned long)req);
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nfsi->npages++;
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atomic_inc(&req->wb_count);
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return 0;
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}
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/*
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* Insert a write request into an inode
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*/
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static void nfs_inode_remove_request(struct nfs_page *req)
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{
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struct inode *inode = req->wb_context->dentry->d_inode;
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struct nfs_inode *nfsi = NFS_I(inode);
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BUG_ON (!NFS_WBACK_BUSY(req));
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spin_lock(&nfsi->req_lock);
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set_page_private(req->wb_page, 0);
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ClearPagePrivate(req->wb_page);
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radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
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nfsi->npages--;
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if (!nfsi->npages) {
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spin_unlock(&nfsi->req_lock);
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nfs_end_data_update(inode);
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iput(inode);
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} else
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spin_unlock(&nfsi->req_lock);
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nfs_clear_request(req);
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nfs_release_request(req);
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}
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/*
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* Add a request to the inode's dirty list.
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*/
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static void
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nfs_mark_request_dirty(struct nfs_page *req)
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{
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struct inode *inode = req->wb_context->dentry->d_inode;
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struct nfs_inode *nfsi = NFS_I(inode);
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spin_lock(&nfsi->req_lock);
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radix_tree_tag_set(&nfsi->nfs_page_tree,
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req->wb_index, NFS_PAGE_TAG_DIRTY);
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nfs_list_add_request(req, &nfsi->dirty);
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nfsi->ndirty++;
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spin_unlock(&nfsi->req_lock);
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__mark_inode_dirty(inode, I_DIRTY_PAGES);
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}
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static void
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nfs_redirty_request(struct nfs_page *req)
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{
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clear_bit(PG_FLUSHING, &req->wb_flags);
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__set_page_dirty_nobuffers(req->wb_page);
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}
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/*
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* Check if a request is dirty
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*/
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static inline int
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nfs_dirty_request(struct nfs_page *req)
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{
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return test_bit(PG_FLUSHING, &req->wb_flags) == 0;
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}
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#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
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/*
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* Add a request to the inode's commit list.
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*/
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static void
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nfs_mark_request_commit(struct nfs_page *req)
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{
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struct inode *inode = req->wb_context->dentry->d_inode;
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struct nfs_inode *nfsi = NFS_I(inode);
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spin_lock(&nfsi->req_lock);
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nfs_list_add_request(req, &nfsi->commit);
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nfsi->ncommit++;
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spin_unlock(&nfsi->req_lock);
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inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
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__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
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}
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#endif
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/*
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* Wait for a request to complete.
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*
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* Interruptible by signals only if mounted with intr flag.
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*/
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static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs_page *req;
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unsigned long idx_end, next;
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unsigned int res = 0;
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int error;
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if (npages == 0)
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idx_end = ~0;
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else
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idx_end = idx_start + npages - 1;
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next = idx_start;
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while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) {
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if (req->wb_index > idx_end)
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break;
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next = req->wb_index + 1;
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BUG_ON(!NFS_WBACK_BUSY(req));
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|
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atomic_inc(&req->wb_count);
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spin_unlock(&nfsi->req_lock);
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error = nfs_wait_on_request(req);
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nfs_release_request(req);
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spin_lock(&nfsi->req_lock);
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if (error < 0)
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return error;
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res++;
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}
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return res;
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}
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|
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static void nfs_cancel_dirty_list(struct list_head *head)
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{
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struct nfs_page *req;
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while(!list_empty(head)) {
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req = nfs_list_entry(head->next);
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nfs_list_remove_request(req);
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nfs_inode_remove_request(req);
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nfs_clear_page_writeback(req);
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}
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}
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|
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static void nfs_cancel_commit_list(struct list_head *head)
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{
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struct nfs_page *req;
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while(!list_empty(head)) {
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req = nfs_list_entry(head->next);
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dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
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nfs_list_remove_request(req);
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nfs_inode_remove_request(req);
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nfs_unlock_request(req);
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|
}
|
|
}
|
|
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
/*
|
|
* nfs_scan_commit - Scan an inode for commit requests
|
|
* @inode: NFS inode to scan
|
|
* @dst: destination list
|
|
* @idx_start: lower bound of page->index to scan.
|
|
* @npages: idx_start + npages sets the upper bound to scan.
|
|
*
|
|
* Moves requests from the inode's 'commit' request list.
|
|
* The requests are *not* checked to ensure that they form a contiguous set.
|
|
*/
|
|
static int
|
|
nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int res = 0;
|
|
|
|
if (nfsi->ncommit != 0) {
|
|
res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages);
|
|
nfsi->ncommit -= res;
|
|
if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit))
|
|
printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n");
|
|
}
|
|
return res;
|
|
}
|
|
#else
|
|
static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr)
|
|
{
|
|
struct backing_dev_info *bdi = mapping->backing_dev_info;
|
|
DEFINE_WAIT(wait);
|
|
int ret = 0;
|
|
|
|
might_sleep();
|
|
|
|
if (!bdi_write_congested(bdi))
|
|
return 0;
|
|
|
|
nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT);
|
|
|
|
if (intr) {
|
|
struct rpc_clnt *clnt = NFS_CLIENT(mapping->host);
|
|
sigset_t oldset;
|
|
|
|
rpc_clnt_sigmask(clnt, &oldset);
|
|
prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE);
|
|
if (bdi_write_congested(bdi)) {
|
|
if (signalled())
|
|
ret = -ERESTARTSYS;
|
|
else
|
|
schedule();
|
|
}
|
|
rpc_clnt_sigunmask(clnt, &oldset);
|
|
} else {
|
|
prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE);
|
|
if (bdi_write_congested(bdi))
|
|
schedule();
|
|
}
|
|
finish_wait(&nfs_write_congestion, &wait);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Try to update any existing write request, or create one if there is none.
|
|
* In order to match, the request's credentials must match those of
|
|
* the calling process.
|
|
*
|
|
* Note: Should always be called with the Page Lock held!
|
|
*/
|
|
static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
|
|
struct page *page, unsigned int offset, unsigned int bytes)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_page *req, *new = NULL;
|
|
unsigned long rqend, end;
|
|
|
|
end = offset + bytes;
|
|
|
|
if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR))
|
|
return ERR_PTR(-ERESTARTSYS);
|
|
for (;;) {
|
|
/* Loop over all inode entries and see if we find
|
|
* A request for the page we wish to update
|
|
*/
|
|
spin_lock(&nfsi->req_lock);
|
|
req = nfs_page_find_request_locked(page);
|
|
if (req) {
|
|
if (!nfs_lock_request_dontget(req)) {
|
|
int error;
|
|
|
|
spin_unlock(&nfsi->req_lock);
|
|
error = nfs_wait_on_request(req);
|
|
nfs_release_request(req);
|
|
if (error < 0) {
|
|
if (new)
|
|
nfs_release_request(new);
|
|
return ERR_PTR(error);
|
|
}
|
|
continue;
|
|
}
|
|
spin_unlock(&nfsi->req_lock);
|
|
if (new)
|
|
nfs_release_request(new);
|
|
break;
|
|
}
|
|
|
|
if (new) {
|
|
int error;
|
|
nfs_lock_request_dontget(new);
|
|
error = nfs_inode_add_request(inode, new);
|
|
if (error) {
|
|
spin_unlock(&nfsi->req_lock);
|
|
nfs_unlock_request(new);
|
|
return ERR_PTR(error);
|
|
}
|
|
spin_unlock(&nfsi->req_lock);
|
|
return new;
|
|
}
|
|
spin_unlock(&nfsi->req_lock);
|
|
|
|
new = nfs_create_request(ctx, inode, page, offset, bytes);
|
|
if (IS_ERR(new))
|
|
return new;
|
|
}
|
|
|
|
/* We have a request for our page.
|
|
* If the creds don't match, or the
|
|
* page addresses don't match,
|
|
* tell the caller to wait on the conflicting
|
|
* request.
|
|
*/
|
|
rqend = req->wb_offset + req->wb_bytes;
|
|
if (req->wb_context != ctx
|
|
|| req->wb_page != page
|
|
|| !nfs_dirty_request(req)
|
|
|| offset > rqend || end < req->wb_offset) {
|
|
nfs_unlock_request(req);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
|
|
/* Okay, the request matches. Update the region */
|
|
if (offset < req->wb_offset) {
|
|
req->wb_offset = offset;
|
|
req->wb_pgbase = offset;
|
|
req->wb_bytes = rqend - req->wb_offset;
|
|
}
|
|
|
|
if (end > rqend)
|
|
req->wb_bytes = end - req->wb_offset;
|
|
|
|
return req;
|
|
}
|
|
|
|
int nfs_flush_incompatible(struct file *file, struct page *page)
|
|
{
|
|
struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
|
|
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_request(page);
|
|
if (req == NULL)
|
|
return 0;
|
|
do_flush = req->wb_page != page || req->wb_context != ctx
|
|
|| !nfs_dirty_request(req);
|
|
nfs_release_request(req);
|
|
if (!do_flush)
|
|
return 0;
|
|
status = nfs_wb_page(page->mapping->host, page);
|
|
} while (status == 0);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* 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 = (struct nfs_open_context *)file->private_data;
|
|
struct inode *inode = page->mapping->host;
|
|
int status = 0;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
|
|
|
|
dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
|
|
file->f_path.dentry->d_parent->d_name.name,
|
|
file->f_path.dentry->d_name.name, count,
|
|
(long long)(page_offset(page) +offset));
|
|
|
|
/* If we're not using byte range locks, and we know the page
|
|
* is entirely in cache, it may be more efficient to avoid
|
|
* fragmenting write requests.
|
|
*/
|
|
if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) {
|
|
count = max(count + offset, nfs_page_length(page));
|
|
offset = 0;
|
|
}
|
|
|
|
status = nfs_writepage_setup(ctx, page, offset, count);
|
|
__set_page_dirty_nobuffers(page);
|
|
|
|
dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
|
|
status, (long long)i_size_read(inode));
|
|
if (status < 0)
|
|
nfs_set_pageerror(page);
|
|
return status;
|
|
}
|
|
|
|
static void nfs_writepage_release(struct nfs_page *req)
|
|
{
|
|
end_page_writeback(req->wb_page);
|
|
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
if (!PageError(req->wb_page)) {
|
|
if (NFS_NEED_RESCHED(req)) {
|
|
nfs_redirty_request(req);
|
|
goto out;
|
|
} else if (NFS_NEED_COMMIT(req)) {
|
|
nfs_mark_request_commit(req);
|
|
goto out;
|
|
}
|
|
}
|
|
nfs_inode_remove_request(req);
|
|
|
|
out:
|
|
nfs_clear_commit(req);
|
|
nfs_clear_reschedule(req);
|
|
#else
|
|
nfs_inode_remove_request(req);
|
|
#endif
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
|
|
static inline 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;
|
|
}
|
|
|
|
/*
|
|
* Set up the argument/result storage required for the RPC call.
|
|
*/
|
|
static void nfs_write_rpcsetup(struct nfs_page *req,
|
|
struct nfs_write_data *data,
|
|
const struct rpc_call_ops *call_ops,
|
|
unsigned int count, unsigned int offset,
|
|
int how)
|
|
{
|
|
struct inode *inode;
|
|
int flags;
|
|
|
|
/* Set up the RPC argument and reply structs
|
|
* NB: take care not to mess about with data->commit et al. */
|
|
|
|
data->req = req;
|
|
data->inode = inode = req->wb_context->dentry->d_inode;
|
|
data->cred = req->wb_context->cred;
|
|
|
|
data->args.fh = NFS_FH(inode);
|
|
data->args.offset = req_offset(req) + offset;
|
|
data->args.pgbase = req->wb_pgbase + offset;
|
|
data->args.pages = data->pagevec;
|
|
data->args.count = count;
|
|
data->args.context = req->wb_context;
|
|
|
|
data->res.fattr = &data->fattr;
|
|
data->res.count = count;
|
|
data->res.verf = &data->verf;
|
|
nfs_fattr_init(&data->fattr);
|
|
|
|
/* Set up the initial task struct. */
|
|
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
|
|
rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data);
|
|
NFS_PROTO(inode)->write_setup(data, how);
|
|
|
|
data->task.tk_priority = flush_task_priority(how);
|
|
data->task.tk_cookie = (unsigned long)inode;
|
|
|
|
dprintk("NFS: %5u initiated write call "
|
|
"(req %s/%Ld, %u bytes @ offset %Lu)\n",
|
|
data->task.tk_pid,
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode),
|
|
count,
|
|
(unsigned long long)data->args.offset);
|
|
}
|
|
|
|
static void nfs_execute_write(struct nfs_write_data *data)
|
|
{
|
|
struct rpc_clnt *clnt = NFS_CLIENT(data->inode);
|
|
sigset_t oldset;
|
|
|
|
rpc_clnt_sigmask(clnt, &oldset);
|
|
rpc_execute(&data->task);
|
|
rpc_clnt_sigunmask(clnt, &oldset);
|
|
}
|
|
|
|
/*
|
|
* Generate multiple small requests to write out a single
|
|
* contiguous dirty area on one page.
|
|
*/
|
|
static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how)
|
|
{
|
|
struct nfs_page *req = nfs_list_entry(head->next);
|
|
struct page *page = req->wb_page;
|
|
struct nfs_write_data *data;
|
|
size_t wsize = NFS_SERVER(inode)->wsize, nbytes;
|
|
unsigned int offset;
|
|
int requests = 0;
|
|
LIST_HEAD(list);
|
|
|
|
nfs_list_remove_request(req);
|
|
|
|
nbytes = req->wb_bytes;
|
|
do {
|
|
size_t len = min(nbytes, wsize);
|
|
|
|
data = nfs_writedata_alloc(len);
|
|
if (!data)
|
|
goto out_bad;
|
|
list_add(&data->pages, &list);
|
|
requests++;
|
|
nbytes -= len;
|
|
} while (nbytes != 0);
|
|
atomic_set(&req->wb_complete, requests);
|
|
|
|
ClearPageError(page);
|
|
offset = 0;
|
|
nbytes = req->wb_bytes;
|
|
do {
|
|
data = list_entry(list.next, struct nfs_write_data, pages);
|
|
list_del_init(&data->pages);
|
|
|
|
data->pagevec[0] = page;
|
|
|
|
if (nbytes > wsize) {
|
|
nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
|
|
wsize, offset, how);
|
|
offset += wsize;
|
|
nbytes -= wsize;
|
|
} else {
|
|
nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
|
|
nbytes, offset, how);
|
|
nbytes = 0;
|
|
}
|
|
nfs_execute_write(data);
|
|
} while (nbytes != 0);
|
|
|
|
return 0;
|
|
|
|
out_bad:
|
|
while (!list_empty(&list)) {
|
|
data = list_entry(list.next, struct nfs_write_data, pages);
|
|
list_del(&data->pages);
|
|
nfs_writedata_release(data);
|
|
}
|
|
nfs_redirty_request(req);
|
|
nfs_clear_page_writeback(req);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Create an RPC task for the given write request and kick it.
|
|
* The page must have been locked by the caller.
|
|
*
|
|
* It may happen that the page we're passed is not marked dirty.
|
|
* This is the case if nfs_updatepage detects a conflicting request
|
|
* that has been written but not committed.
|
|
*/
|
|
static int nfs_flush_one(struct inode *inode, struct list_head *head, int how)
|
|
{
|
|
struct nfs_page *req;
|
|
struct page **pages;
|
|
struct nfs_write_data *data;
|
|
unsigned int count;
|
|
|
|
data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize);
|
|
if (!data)
|
|
goto out_bad;
|
|
|
|
pages = data->pagevec;
|
|
count = 0;
|
|
while (!list_empty(head)) {
|
|
req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_list_add_request(req, &data->pages);
|
|
ClearPageError(req->wb_page);
|
|
*pages++ = req->wb_page;
|
|
count += req->wb_bytes;
|
|
}
|
|
req = nfs_list_entry(data->pages.next);
|
|
|
|
/* Set up the argument struct */
|
|
nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how);
|
|
|
|
nfs_execute_write(data);
|
|
return 0;
|
|
out_bad:
|
|
while (!list_empty(head)) {
|
|
struct nfs_page *req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_redirty_request(req);
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how)
|
|
{
|
|
LIST_HEAD(one_request);
|
|
int (*flush_one)(struct inode *, struct list_head *, int);
|
|
struct nfs_page *req;
|
|
int wpages = NFS_SERVER(inode)->wpages;
|
|
int wsize = NFS_SERVER(inode)->wsize;
|
|
int error;
|
|
|
|
flush_one = nfs_flush_one;
|
|
if (wsize < PAGE_CACHE_SIZE)
|
|
flush_one = nfs_flush_multi;
|
|
/* For single writes, FLUSH_STABLE is more efficient */
|
|
if (npages <= wpages && npages == NFS_I(inode)->npages
|
|
&& nfs_list_entry(head->next)->wb_bytes <= wsize)
|
|
how |= FLUSH_STABLE;
|
|
|
|
do {
|
|
nfs_coalesce_requests(head, &one_request, wpages);
|
|
req = nfs_list_entry(one_request.next);
|
|
error = flush_one(inode, &one_request, how);
|
|
if (error < 0)
|
|
goto out_err;
|
|
} while (!list_empty(head));
|
|
return 0;
|
|
out_err:
|
|
while (!list_empty(head)) {
|
|
req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_redirty_request(req);
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Handle a write reply that flushed part of a page.
|
|
*/
|
|
static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
struct nfs_page *req = data->req;
|
|
struct page *page = req->wb_page;
|
|
|
|
dprintk("NFS: write (%s/%Ld %d@%Ld)",
|
|
req->wb_context->dentry->d_inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(req->wb_context->dentry->d_inode),
|
|
req->wb_bytes,
|
|
(long long)req_offset(req));
|
|
|
|
if (nfs_writeback_done(task, data) != 0)
|
|
return;
|
|
|
|
if (task->tk_status < 0) {
|
|
nfs_set_pageerror(page);
|
|
req->wb_context->error = task->tk_status;
|
|
dprintk(", error = %d\n", task->tk_status);
|
|
} else {
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
if (data->verf.committed < NFS_FILE_SYNC) {
|
|
if (!NFS_NEED_COMMIT(req)) {
|
|
nfs_defer_commit(req);
|
|
memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
|
|
dprintk(" defer commit\n");
|
|
} else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
|
|
nfs_defer_reschedule(req);
|
|
dprintk(" server reboot detected\n");
|
|
}
|
|
} else
|
|
#endif
|
|
dprintk(" OK\n");
|
|
}
|
|
|
|
if (atomic_dec_and_test(&req->wb_complete))
|
|
nfs_writepage_release(req);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_write_partial_ops = {
|
|
.rpc_call_done = nfs_writeback_done_partial,
|
|
.rpc_release = nfs_writedata_release,
|
|
};
|
|
|
|
/*
|
|
* Handle a write reply that flushes a whole page.
|
|
*
|
|
* FIXME: There is an inherent race with invalidate_inode_pages and
|
|
* writebacks since the page->count is kept > 1 for as long
|
|
* as the page has a write request pending.
|
|
*/
|
|
static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
struct nfs_page *req;
|
|
struct page *page;
|
|
|
|
if (nfs_writeback_done(task, data) != 0)
|
|
return;
|
|
|
|
/* Update attributes as result of writeback. */
|
|
while (!list_empty(&data->pages)) {
|
|
req = nfs_list_entry(data->pages.next);
|
|
nfs_list_remove_request(req);
|
|
page = req->wb_page;
|
|
|
|
dprintk("NFS: write (%s/%Ld %d@%Ld)",
|
|
req->wb_context->dentry->d_inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(req->wb_context->dentry->d_inode),
|
|
req->wb_bytes,
|
|
(long long)req_offset(req));
|
|
|
|
if (task->tk_status < 0) {
|
|
nfs_set_pageerror(page);
|
|
req->wb_context->error = task->tk_status;
|
|
end_page_writeback(page);
|
|
nfs_inode_remove_request(req);
|
|
dprintk(", error = %d\n", task->tk_status);
|
|
goto next;
|
|
}
|
|
end_page_writeback(page);
|
|
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) {
|
|
nfs_inode_remove_request(req);
|
|
dprintk(" OK\n");
|
|
goto next;
|
|
}
|
|
memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
|
|
nfs_mark_request_commit(req);
|
|
dprintk(" marked for commit\n");
|
|
#else
|
|
nfs_inode_remove_request(req);
|
|
#endif
|
|
next:
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_write_full_ops = {
|
|
.rpc_call_done = nfs_writeback_done_full,
|
|
.rpc_release = nfs_writedata_release,
|
|
};
|
|
|
|
|
|
/*
|
|
* This function is called when the WRITE call is complete.
|
|
*/
|
|
int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
|
|
{
|
|
struct nfs_writeargs *argp = &data->args;
|
|
struct nfs_writeres *resp = &data->res;
|
|
int status;
|
|
|
|
dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
|
|
task->tk_pid, task->tk_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(data->inode)->write_done(task, data);
|
|
if (status != 0)
|
|
return status;
|
|
nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
|
|
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
if (resp->verf->committed < argp->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;
|
|
|
|
if (time_before(complain, jiffies)) {
|
|
dprintk("NFS: faulty NFS server %s:"
|
|
" (committed = %d) != (stable = %d)\n",
|
|
NFS_SERVER(data->inode)->nfs_client->cl_hostname,
|
|
resp->verf->committed, argp->stable);
|
|
complain = jiffies + 300 * HZ;
|
|
}
|
|
}
|
|
#endif
|
|
/* Is this a short write? */
|
|
if (task->tk_status >= 0 && resp->count < argp->count) {
|
|
static unsigned long complain;
|
|
|
|
nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
|
|
|
|
/* Has the server at least made some progress? */
|
|
if (resp->count != 0) {
|
|
/* Was this an NFSv2 write or an NFSv3 stable write? */
|
|
if (resp->verf->committed != NFS_UNSTABLE) {
|
|
/* Resend from where the server left off */
|
|
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(task);
|
|
return -EAGAIN;
|
|
}
|
|
if (time_before(complain, jiffies)) {
|
|
printk(KERN_WARNING
|
|
"NFS: Server wrote zero bytes, expected %u.\n",
|
|
argp->count);
|
|
complain = jiffies + 300 * HZ;
|
|
}
|
|
/* Can't do anything about it except throw an error. */
|
|
task->tk_status = -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
void nfs_commit_release(void *wdata)
|
|
{
|
|
nfs_commit_free(wdata);
|
|
}
|
|
|
|
/*
|
|
* Set up the argument/result storage required for the RPC call.
|
|
*/
|
|
static void nfs_commit_rpcsetup(struct list_head *head,
|
|
struct nfs_write_data *data,
|
|
int how)
|
|
{
|
|
struct nfs_page *first;
|
|
struct inode *inode;
|
|
int flags;
|
|
|
|
/* 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);
|
|
first = nfs_list_entry(data->pages.next);
|
|
inode = first->wb_context->dentry->d_inode;
|
|
|
|
data->inode = inode;
|
|
data->cred = first->wb_context->cred;
|
|
|
|
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->res.count = 0;
|
|
data->res.fattr = &data->fattr;
|
|
data->res.verf = &data->verf;
|
|
nfs_fattr_init(&data->fattr);
|
|
|
|
/* Set up the initial task struct. */
|
|
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
|
|
rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data);
|
|
NFS_PROTO(inode)->commit_setup(data, how);
|
|
|
|
data->task.tk_priority = flush_task_priority(how);
|
|
data->task.tk_cookie = (unsigned long)inode;
|
|
|
|
dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
|
|
}
|
|
|
|
/*
|
|
* Commit dirty pages
|
|
*/
|
|
static int
|
|
nfs_commit_list(struct inode *inode, struct list_head *head, int how)
|
|
{
|
|
struct nfs_write_data *data;
|
|
struct nfs_page *req;
|
|
|
|
data = nfs_commit_alloc();
|
|
|
|
if (!data)
|
|
goto out_bad;
|
|
|
|
/* Set up the argument struct */
|
|
nfs_commit_rpcsetup(head, data, how);
|
|
|
|
nfs_execute_write(data);
|
|
return 0;
|
|
out_bad:
|
|
while (!list_empty(head)) {
|
|
req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_mark_request_commit(req);
|
|
dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* COMMIT call returned
|
|
*/
|
|
static void nfs_commit_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
struct nfs_page *req;
|
|
|
|
dprintk("NFS: %5u nfs_commit_done (status %d)\n",
|
|
task->tk_pid, task->tk_status);
|
|
|
|
/* Call the NFS version-specific code */
|
|
if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
|
|
return;
|
|
|
|
while (!list_empty(&data->pages)) {
|
|
req = nfs_list_entry(data->pages.next);
|
|
nfs_list_remove_request(req);
|
|
dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
|
|
|
|
dprintk("NFS: commit (%s/%Ld %d@%Ld)",
|
|
req->wb_context->dentry->d_inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(req->wb_context->dentry->d_inode),
|
|
req->wb_bytes,
|
|
(long long)req_offset(req));
|
|
if (task->tk_status < 0) {
|
|
req->wb_context->error = task->tk_status;
|
|
nfs_inode_remove_request(req);
|
|
dprintk(", error = %d\n", task->tk_status);
|
|
goto next;
|
|
}
|
|
|
|
/* Okay, COMMIT succeeded, apparently. Check the verifier
|
|
* returned by the server against all stored verfs. */
|
|
if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
|
|
/* 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_redirty_request(req);
|
|
next:
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_commit_ops = {
|
|
.rpc_call_done = nfs_commit_done,
|
|
.rpc_release = nfs_commit_release,
|
|
};
|
|
#else
|
|
static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(mapping->host);
|
|
LIST_HEAD(head);
|
|
long res;
|
|
|
|
spin_lock(&nfsi->req_lock);
|
|
res = nfs_scan_dirty(mapping, wbc, &head);
|
|
spin_unlock(&nfsi->req_lock);
|
|
if (res) {
|
|
int error = nfs_flush_list(mapping->host, &head, res, how);
|
|
if (error < 0)
|
|
return error;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
int nfs_commit_inode(struct inode *inode, int how)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
LIST_HEAD(head);
|
|
int res;
|
|
|
|
spin_lock(&nfsi->req_lock);
|
|
res = nfs_scan_commit(inode, &head, 0, 0);
|
|
spin_unlock(&nfsi->req_lock);
|
|
if (res) {
|
|
int error = nfs_commit_list(inode, &head, how);
|
|
if (error < 0)
|
|
return error;
|
|
}
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
unsigned long idx_start, idx_end;
|
|
unsigned int npages = 0;
|
|
LIST_HEAD(head);
|
|
int nocommit = how & FLUSH_NOCOMMIT;
|
|
long pages, ret;
|
|
|
|
/* FIXME */
|
|
if (wbc->range_cyclic)
|
|
idx_start = 0;
|
|
else {
|
|
idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
|
|
idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
|
|
if (idx_end > idx_start) {
|
|
unsigned long l_npages = 1 + idx_end - idx_start;
|
|
npages = l_npages;
|
|
if (sizeof(npages) != sizeof(l_npages) &&
|
|
(unsigned long)npages != l_npages)
|
|
npages = 0;
|
|
}
|
|
}
|
|
how &= ~FLUSH_NOCOMMIT;
|
|
spin_lock(&nfsi->req_lock);
|
|
do {
|
|
wbc->pages_skipped = 0;
|
|
ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
|
|
if (ret != 0)
|
|
continue;
|
|
pages = nfs_scan_dirty(mapping, wbc, &head);
|
|
if (pages != 0) {
|
|
spin_unlock(&nfsi->req_lock);
|
|
if (how & FLUSH_INVALIDATE) {
|
|
nfs_cancel_dirty_list(&head);
|
|
ret = pages;
|
|
} else
|
|
ret = nfs_flush_list(inode, &head, pages, how);
|
|
spin_lock(&nfsi->req_lock);
|
|
continue;
|
|
}
|
|
if (wbc->pages_skipped != 0)
|
|
continue;
|
|
if (nocommit)
|
|
break;
|
|
pages = nfs_scan_commit(inode, &head, idx_start, npages);
|
|
if (pages == 0) {
|
|
if (wbc->pages_skipped != 0)
|
|
continue;
|
|
break;
|
|
}
|
|
if (how & FLUSH_INVALIDATE) {
|
|
spin_unlock(&nfsi->req_lock);
|
|
nfs_cancel_commit_list(&head);
|
|
ret = pages;
|
|
spin_lock(&nfsi->req_lock);
|
|
continue;
|
|
}
|
|
pages += nfs_scan_commit(inode, &head, 0, 0);
|
|
spin_unlock(&nfsi->req_lock);
|
|
ret = nfs_commit_list(inode, &head, how);
|
|
spin_lock(&nfsi->req_lock);
|
|
} while (ret >= 0);
|
|
spin_unlock(&nfsi->req_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* flush the inode to disk.
|
|
*/
|
|
int nfs_wb_all(struct inode *inode)
|
|
{
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct writeback_control wbc = {
|
|
.bdi = mapping->backing_dev_info,
|
|
.sync_mode = WB_SYNC_ALL,
|
|
.nr_to_write = LONG_MAX,
|
|
.for_writepages = 1,
|
|
.range_cyclic = 1,
|
|
};
|
|
int ret;
|
|
|
|
ret = generic_writepages(mapping, &wbc);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = nfs_sync_mapping_wait(mapping, &wbc, 0);
|
|
if (ret >= 0)
|
|
return 0;
|
|
out:
|
|
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
|
|
return ret;
|
|
}
|
|
|
|
int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how)
|
|
{
|
|
struct writeback_control wbc = {
|
|
.bdi = mapping->backing_dev_info,
|
|
.sync_mode = WB_SYNC_ALL,
|
|
.nr_to_write = LONG_MAX,
|
|
.range_start = range_start,
|
|
.range_end = range_end,
|
|
.for_writepages = 1,
|
|
};
|
|
int ret;
|
|
|
|
if (!(how & FLUSH_NOWRITEPAGE)) {
|
|
ret = generic_writepages(mapping, &wbc);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
ret = nfs_sync_mapping_wait(mapping, &wbc, how);
|
|
if (ret >= 0)
|
|
return 0;
|
|
out:
|
|
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
|
|
return ret;
|
|
}
|
|
|
|
int nfs_wb_page_priority(struct inode *inode, struct page *page, int how)
|
|
{
|
|
loff_t range_start = page_offset(page);
|
|
loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
|
|
struct writeback_control wbc = {
|
|
.bdi = page->mapping->backing_dev_info,
|
|
.sync_mode = WB_SYNC_ALL,
|
|
.nr_to_write = LONG_MAX,
|
|
.range_start = range_start,
|
|
.range_end = range_end,
|
|
};
|
|
int ret;
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) {
|
|
ret = nfs_writepage_locked(page, &wbc);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
if (!PagePrivate(page))
|
|
return 0;
|
|
ret = nfs_sync_mapping_wait(page->mapping, &wbc, how);
|
|
if (ret >= 0)
|
|
return 0;
|
|
out:
|
|
__mark_inode_dirty(inode, I_DIRTY_PAGES);
|
|
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)
|
|
{
|
|
return nfs_wb_page_priority(inode, page, FLUSH_STABLE);
|
|
}
|
|
|
|
int nfs_set_page_dirty(struct page *page)
|
|
{
|
|
struct nfs_page *req;
|
|
|
|
req = nfs_page_find_request(page);
|
|
if (req != NULL) {
|
|
/* Mark any existing write requests for flushing */
|
|
set_bit(PG_NEED_FLUSH, &req->wb_flags);
|
|
nfs_release_request(req);
|
|
}
|
|
return __set_page_dirty_nobuffers(page);
|
|
}
|
|
|
|
|
|
int __init nfs_init_writepagecache(void)
|
|
{
|
|
nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
|
|
sizeof(struct nfs_write_data),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL, 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)
|
|
return -ENOMEM;
|
|
|
|
nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
|
|
nfs_wdata_cachep);
|
|
if (nfs_commit_mempool == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nfs_destroy_writepagecache(void)
|
|
{
|
|
mempool_destroy(nfs_commit_mempool);
|
|
mempool_destroy(nfs_wdata_mempool);
|
|
kmem_cache_destroy(nfs_wdata_cachep);
|
|
}
|
|
|