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![Trond Myklebust](/assets/img/avatar_default.png)
This patch ensures that we free the rpc_task after the cleanup callbacks are done in order to avoid a deadlock problem that can be triggered if the callback needs to wait for another workqueue item to complete. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Weston Andros Adamson <dros@netapp.com> Cc: Tejun Heo <tj@kernel.org> Cc: Bruce Fields <bfields@fieldses.org> Cc: stable@vger.kernel.org [>= 3.5]
1872 lines
48 KiB
C
1872 lines
48 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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#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_write_common_ops;
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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 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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struct nfs_write_header *nfs_writehdr_alloc(void)
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{
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struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
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if (p) {
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struct nfs_pgio_header *hdr = &p->header;
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memset(p, 0, sizeof(*p));
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INIT_LIST_HEAD(&hdr->pages);
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INIT_LIST_HEAD(&hdr->rpc_list);
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spin_lock_init(&hdr->lock);
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atomic_set(&hdr->refcnt, 0);
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hdr->verf = &p->verf;
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}
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return p;
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}
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EXPORT_SYMBOL_GPL(nfs_writehdr_alloc);
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static struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
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unsigned int pagecount)
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{
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struct nfs_write_data *data, *prealloc;
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prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data;
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if (prealloc->header == NULL)
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data = prealloc;
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else
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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goto out;
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if (nfs_pgarray_set(&data->pages, pagecount)) {
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data->header = hdr;
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atomic_inc(&hdr->refcnt);
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} else {
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if (data != prealloc)
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kfree(data);
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data = NULL;
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}
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out:
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return data;
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}
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void nfs_writehdr_free(struct nfs_pgio_header *hdr)
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{
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struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
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mempool_free(whdr, nfs_wdata_mempool);
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}
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EXPORT_SYMBOL_GPL(nfs_writehdr_free);
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void nfs_writedata_release(struct nfs_write_data *wdata)
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{
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struct nfs_pgio_header *hdr = wdata->header;
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struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header);
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put_nfs_open_context(wdata->args.context);
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if (wdata->pages.pagevec != wdata->pages.page_array)
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kfree(wdata->pages.pagevec);
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if (wdata == &write_header->rpc_data) {
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wdata->header = NULL;
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wdata = NULL;
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}
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if (atomic_dec_and_test(&hdr->refcnt))
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hdr->completion_ops->completion(hdr);
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/* Note: we only free the rpc_task after callbacks are done.
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* See the comment in rpc_free_task() for why
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*/
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kfree(wdata);
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}
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EXPORT_SYMBOL_GPL(nfs_writedata_release);
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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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static struct nfs_page *
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nfs_page_find_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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struct nfs_page *freq, *t;
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/* Linearly search the commit list for the correct req */
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list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) {
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if (freq->wb_page == page) {
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req = freq;
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break;
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}
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}
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}
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if (req)
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kref_get(&req->wb_kref);
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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 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_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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/* 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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SetPageUptodate(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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if (wbc->for_reclaim)
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return FLUSH_HIGHPRI | FLUSH_STABLE;
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if (wbc->for_kupdate || wbc->for_background)
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return FLUSH_LOWPRI | FLUSH_COND_STABLE;
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return FLUSH_COND_STABLE;
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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 page *page)
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{
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struct inode *inode = page_file_mapping(page)->host;
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struct nfs_server *nfss = NFS_SERVER(inode);
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end_page_writeback(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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static struct nfs_page *nfs_find_and_lock_request(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 *req;
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int ret;
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spin_lock(&inode->i_lock);
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for (;;) {
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req = nfs_page_find_request_locked(NFS_I(inode), page);
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if (req == NULL)
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break;
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if (nfs_lock_request(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() 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(&inode->i_lock);
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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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if (ret != 0)
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return ERR_PTR(ret);
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spin_lock(&inode->i_lock);
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}
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spin_unlock(&inode->i_lock);
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return req;
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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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* May return an error if the user signalled nfs_wait_on_request().
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*/
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static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
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struct page *page, bool nonblock)
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{
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struct nfs_page *req;
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int ret = 0;
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req = nfs_find_and_lock_request(page, nonblock);
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if (!req)
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goto out;
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ret = PTR_ERR(req);
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if (IS_ERR(req))
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goto out;
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nfs_set_page_writeback(page);
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WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
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ret = 0;
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if (!nfs_pageio_add_request(pgio, req)) {
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nfs_redirty_request(req);
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ret = pgio->pg_error;
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}
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out:
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return ret;
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}
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static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
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{
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struct inode *inode = page_file_mapping(page)->host;
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int ret;
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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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nfs_pageio_cond_complete(pgio, page_file_index(page));
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ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
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if (ret == -EAGAIN) {
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redirty_page_for_writepage(wbc, page);
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ret = 0;
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}
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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_pageio_descriptor pgio;
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int err;
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NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
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page->mapping->host,
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wb_priority(wbc),
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&nfs_async_write_completion_ops);
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err = nfs_do_writepage(page, wbc, &pgio);
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nfs_pageio_complete(&pgio);
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if (err < 0)
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return err;
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if (pgio.pg_error < 0)
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return pgio.pg_error;
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return 0;
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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 ret;
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ret = nfs_writepage_locked(page, wbc);
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unlock_page(page);
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return ret;
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}
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static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
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{
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int ret;
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ret = nfs_do_writepage(page, wbc, data);
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unlock_page(page);
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return ret;
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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 inode *inode = mapping->host;
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unsigned long *bitlock = &NFS_I(inode)->flags;
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struct nfs_pageio_descriptor pgio;
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int err;
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/* Stop dirtying of new pages while we sync */
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err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
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nfs_wait_bit_killable, TASK_KILLABLE);
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if (err)
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goto out_err;
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nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
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NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops);
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err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
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nfs_pageio_complete(&pgio);
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clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
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smp_mb__after_clear_bit();
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wake_up_bit(bitlock, NFS_INO_FLUSHING);
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if (err < 0)
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goto out_err;
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err = pgio.pg_error;
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if (err < 0)
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goto out_err;
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return 0;
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out_err:
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return err;
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}
|
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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_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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|
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/* Lock the request! */
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nfs_lock_request(req);
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|
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spin_lock(&inode->i_lock);
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if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
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inode->i_version++;
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/*
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* Swap-space should not get truncated. Hence no need to plug the race
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* with invalidate/truncate.
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*/
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if (likely(!PageSwapCache(req->wb_page))) {
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set_bit(PG_MAPPED, &req->wb_flags);
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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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}
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nfsi->npages++;
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kref_get(&req->wb_kref);
|
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spin_unlock(&inode->i_lock);
|
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}
|
|
|
|
/*
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* Remove a write request from 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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spin_lock(&inode->i_lock);
|
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if (likely(!PageSwapCache(req->wb_page))) {
|
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set_page_private(req->wb_page, 0);
|
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ClearPagePrivate(req->wb_page);
|
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clear_bit(PG_MAPPED, &req->wb_flags);
|
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}
|
|
nfsi->npages--;
|
|
spin_unlock(&inode->i_lock);
|
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nfs_release_request(req);
|
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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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__set_page_dirty_nobuffers(req->wb_page);
|
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}
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
|
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/**
|
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* nfs_request_add_commit_list - add request to a commit list
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* @req: pointer to a struct nfs_page
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* @dst: commit list head
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|
* @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
|
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* 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) {
|
|
inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
|
|
inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
|
|
BDI_RECLAIMABLE);
|
|
__mark_inode_dirty(req->wb_context->dentry->d_inode,
|
|
I_DIRTY_DATASYNC);
|
|
}
|
|
}
|
|
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)
|
|
{
|
|
if (pnfs_mark_request_commit(req, lseg, cinfo))
|
|
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_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE);
|
|
}
|
|
|
|
static void
|
|
nfs_clear_request_commit(struct nfs_page *req)
|
|
{
|
|
if (test_bit(PG_CLEAN, &req->wb_flags)) {
|
|
struct inode *inode = req->wb_context->dentry->d_inode;
|
|
struct nfs_commit_info cinfo;
|
|
|
|
nfs_init_cinfo_from_inode(&cinfo, inode);
|
|
if (!pnfs_clear_request_commit(req, &cinfo)) {
|
|
spin_lock(cinfo.lock);
|
|
nfs_request_remove_commit_list(req, &cinfo);
|
|
spin_unlock(cinfo.lock);
|
|
}
|
|
nfs_clear_page_commit(req->wb_page);
|
|
}
|
|
}
|
|
|
|
static inline
|
|
int nfs_write_need_commit(struct nfs_write_data *data)
|
|
{
|
|
if (data->verf.committed == NFS_DATA_SYNC)
|
|
return data->header->lseg == NULL;
|
|
return data->verf.committed != NFS_FILE_SYNC;
|
|
}
|
|
|
|
#else
|
|
static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
|
|
struct inode *inode)
|
|
{
|
|
}
|
|
|
|
void nfs_init_cinfo(struct nfs_commit_info *cinfo,
|
|
struct inode *inode,
|
|
struct nfs_direct_req *dreq)
|
|
{
|
|
}
|
|
|
|
void
|
|
nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
}
|
|
|
|
static void
|
|
nfs_clear_request_commit(struct nfs_page *req)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
int nfs_write_need_commit(struct nfs_write_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
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 (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) {
|
|
nfs_mark_request_dirty(req);
|
|
goto next;
|
|
}
|
|
if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) {
|
|
memcpy(&req->wb_verf, &hdr->verf->verifier, sizeof(req->wb_verf));
|
|
nfs_mark_request_commit(req, hdr->lseg, &cinfo);
|
|
goto next;
|
|
}
|
|
remove_req:
|
|
nfs_inode_remove_request(req);
|
|
next:
|
|
nfs_unlock_request(req);
|
|
nfs_end_page_writeback(req->wb_page);
|
|
nfs_release_request(req);
|
|
}
|
|
out:
|
|
hdr->release(hdr);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
|
|
static 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;
|
|
}
|
|
|
|
#else
|
|
static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int nfs_scan_commit(struct inode *inode, struct list_head *dst,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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_request_locked(NFS_I(inode), page);
|
|
if (req == NULL)
|
|
goto out_unlock;
|
|
|
|
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:
|
|
spin_unlock(&inode->i_lock);
|
|
if (req)
|
|
nfs_clear_request_commit(req);
|
|
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, inode, page, 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(page, req->wb_pgbase, req->wb_bytes);
|
|
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 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;
|
|
l_ctx = req->wb_lock_context;
|
|
do_flush = req->wb_page != page || req->wb_context != ctx;
|
|
if (l_ctx) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
if (nfs_have_delegated_attributes(inode))
|
|
goto out;
|
|
if (NFS_I(inode)->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE))
|
|
return false;
|
|
out:
|
|
return PageUptodate(page) != 0;
|
|
}
|
|
|
|
/*
|
|
* 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(%s/%s %d@%lld)\n",
|
|
file->f_path.dentry->d_parent->d_name.name,
|
|
file->f_path.dentry->d_name.name, count,
|
|
(long long)(page_file_offset(page) + offset));
|
|
|
|
/* If we're not using byte range locks, and we know the page
|
|
* is up to date, it may be more efficient to extend the write
|
|
* to cover the entire page in order to avoid fragmentation
|
|
* inefficiencies.
|
|
*/
|
|
if (nfs_write_pageuptodate(page, inode) &&
|
|
inode->i_flock == NULL &&
|
|
!(file->f_flags & O_DSYNC)) {
|
|
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;
|
|
}
|
|
|
|
int nfs_initiate_write(struct rpc_clnt *clnt,
|
|
struct nfs_write_data *data,
|
|
const struct rpc_call_ops *call_ops,
|
|
int how, int flags)
|
|
{
|
|
struct inode *inode = data->header->inode;
|
|
int priority = flush_task_priority(how);
|
|
struct rpc_task *task;
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &data->args,
|
|
.rpc_resp = &data->res,
|
|
.rpc_cred = data->header->cred,
|
|
};
|
|
struct rpc_task_setup task_setup_data = {
|
|
.rpc_client = clnt,
|
|
.task = &data->task,
|
|
.rpc_message = &msg,
|
|
.callback_ops = call_ops,
|
|
.callback_data = data,
|
|
.workqueue = nfsiod_workqueue,
|
|
.flags = RPC_TASK_ASYNC | flags,
|
|
.priority = priority,
|
|
};
|
|
int ret = 0;
|
|
|
|
/* Set up the initial task struct. */
|
|
NFS_PROTO(inode)->write_setup(data, &msg);
|
|
|
|
dprintk("NFS: %5u initiated write call "
|
|
"(req %s/%lld, %u bytes @ offset %llu)\n",
|
|
data->task.tk_pid,
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode),
|
|
data->args.count,
|
|
(unsigned long long)data->args.offset);
|
|
|
|
task = rpc_run_task(&task_setup_data);
|
|
if (IS_ERR(task)) {
|
|
ret = PTR_ERR(task);
|
|
goto out;
|
|
}
|
|
if (how & FLUSH_SYNC) {
|
|
ret = rpc_wait_for_completion_task(task);
|
|
if (ret == 0)
|
|
ret = task->tk_status;
|
|
}
|
|
rpc_put_task(task);
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_initiate_write);
|
|
|
|
/*
|
|
* Set up the argument/result storage required for the RPC call.
|
|
*/
|
|
static void nfs_write_rpcsetup(struct nfs_write_data *data,
|
|
unsigned int count, unsigned int offset,
|
|
int how, struct nfs_commit_info *cinfo)
|
|
{
|
|
struct nfs_page *req = data->header->req;
|
|
|
|
/* Set up the RPC argument and reply structs
|
|
* NB: take care not to mess about with data->commit et al. */
|
|
|
|
data->args.fh = NFS_FH(data->header->inode);
|
|
data->args.offset = req_offset(req) + offset;
|
|
/* pnfs_set_layoutcommit needs this */
|
|
data->mds_offset = data->args.offset;
|
|
data->args.pgbase = req->wb_pgbase + offset;
|
|
data->args.pages = data->pages.pagevec;
|
|
data->args.count = count;
|
|
data->args.context = get_nfs_open_context(req->wb_context);
|
|
data->args.lock_context = req->wb_lock_context;
|
|
data->args.stable = NFS_UNSTABLE;
|
|
switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
|
|
case 0:
|
|
break;
|
|
case FLUSH_COND_STABLE:
|
|
if (nfs_reqs_to_commit(cinfo))
|
|
break;
|
|
default:
|
|
data->args.stable = NFS_FILE_SYNC;
|
|
}
|
|
|
|
data->res.fattr = &data->fattr;
|
|
data->res.count = count;
|
|
data->res.verf = &data->verf;
|
|
nfs_fattr_init(&data->fattr);
|
|
}
|
|
|
|
static int nfs_do_write(struct nfs_write_data *data,
|
|
const struct rpc_call_ops *call_ops,
|
|
int how)
|
|
{
|
|
struct inode *inode = data->header->inode;
|
|
|
|
return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how, 0);
|
|
}
|
|
|
|
static int nfs_do_multiple_writes(struct list_head *head,
|
|
const struct rpc_call_ops *call_ops,
|
|
int how)
|
|
{
|
|
struct nfs_write_data *data;
|
|
int ret = 0;
|
|
|
|
while (!list_empty(head)) {
|
|
int ret2;
|
|
|
|
data = list_first_entry(head, struct nfs_write_data, list);
|
|
list_del_init(&data->list);
|
|
|
|
ret2 = nfs_do_write(data, call_ops, how);
|
|
if (ret == 0)
|
|
ret = ret2;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* 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);
|
|
nfs_unlock_request(req);
|
|
nfs_end_page_writeback(req->wb_page);
|
|
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,
|
|
};
|
|
|
|
static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
set_bit(NFS_IOHDR_REDO, &hdr->flags);
|
|
while (!list_empty(&hdr->rpc_list)) {
|
|
struct nfs_write_data *data = list_first_entry(&hdr->rpc_list,
|
|
struct nfs_write_data, list);
|
|
list_del(&data->list);
|
|
nfs_writedata_release(data);
|
|
}
|
|
desc->pg_completion_ops->error_cleanup(&desc->pg_list);
|
|
}
|
|
|
|
/*
|
|
* Generate multiple small requests to write out a single
|
|
* contiguous dirty area on one page.
|
|
*/
|
|
static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_page *req = hdr->req;
|
|
struct page *page = req->wb_page;
|
|
struct nfs_write_data *data;
|
|
size_t wsize = desc->pg_bsize, nbytes;
|
|
unsigned int offset;
|
|
int requests = 0;
|
|
struct nfs_commit_info cinfo;
|
|
|
|
nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
|
|
|
|
if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
|
|
(desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
|
|
desc->pg_count > wsize))
|
|
desc->pg_ioflags &= ~FLUSH_COND_STABLE;
|
|
|
|
|
|
offset = 0;
|
|
nbytes = desc->pg_count;
|
|
do {
|
|
size_t len = min(nbytes, wsize);
|
|
|
|
data = nfs_writedata_alloc(hdr, 1);
|
|
if (!data) {
|
|
nfs_flush_error(desc, hdr);
|
|
return -ENOMEM;
|
|
}
|
|
data->pages.pagevec[0] = page;
|
|
nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
|
|
list_add(&data->list, &hdr->rpc_list);
|
|
requests++;
|
|
nbytes -= len;
|
|
offset += len;
|
|
} while (nbytes != 0);
|
|
nfs_list_remove_request(req);
|
|
nfs_list_add_request(req, &hdr->pages);
|
|
desc->pg_rpc_callops = &nfs_write_common_ops;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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 nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_page *req;
|
|
struct page **pages;
|
|
struct nfs_write_data *data;
|
|
struct list_head *head = &desc->pg_list;
|
|
struct nfs_commit_info cinfo;
|
|
|
|
data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
|
|
desc->pg_count));
|
|
if (!data) {
|
|
nfs_flush_error(desc, hdr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
|
|
pages = data->pages.pagevec;
|
|
while (!list_empty(head)) {
|
|
req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_list_add_request(req, &hdr->pages);
|
|
*pages++ = req->wb_page;
|
|
}
|
|
|
|
if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
|
|
(desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
|
|
desc->pg_ioflags &= ~FLUSH_COND_STABLE;
|
|
|
|
/* Set up the argument struct */
|
|
nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
|
|
list_add(&data->list, &hdr->rpc_list);
|
|
desc->pg_rpc_callops = &nfs_write_common_ops;
|
|
return 0;
|
|
}
|
|
|
|
int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
if (desc->pg_bsize < PAGE_CACHE_SIZE)
|
|
return nfs_flush_multi(desc, hdr);
|
|
return nfs_flush_one(desc, hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_generic_flush);
|
|
|
|
static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_write_header *whdr;
|
|
struct nfs_pgio_header *hdr;
|
|
int ret;
|
|
|
|
whdr = nfs_writehdr_alloc();
|
|
if (!whdr) {
|
|
desc->pg_completion_ops->error_cleanup(&desc->pg_list);
|
|
return -ENOMEM;
|
|
}
|
|
hdr = &whdr->header;
|
|
nfs_pgheader_init(desc, hdr, nfs_writehdr_free);
|
|
atomic_inc(&hdr->refcnt);
|
|
ret = nfs_generic_flush(desc, hdr);
|
|
if (ret == 0)
|
|
ret = nfs_do_multiple_writes(&hdr->rpc_list,
|
|
desc->pg_rpc_callops,
|
|
desc->pg_ioflags);
|
|
if (atomic_dec_and_test(&hdr->refcnt))
|
|
hdr->completion_ops->completion(hdr);
|
|
return ret;
|
|
}
|
|
|
|
static const struct nfs_pageio_ops nfs_pageio_write_ops = {
|
|
.pg_test = nfs_generic_pg_test,
|
|
.pg_doio = nfs_generic_pg_writepages,
|
|
};
|
|
|
|
void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
|
|
struct inode *inode, int ioflags,
|
|
const struct nfs_pgio_completion_ops *compl_ops)
|
|
{
|
|
nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
|
|
NFS_SERVER(inode)->wsize, ioflags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
|
|
|
|
void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
|
|
{
|
|
pgio->pg_ops = &nfs_pageio_write_ops;
|
|
pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
|
|
|
|
|
|
void nfs_write_prepare(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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_common(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
|
|
nfs_writeback_done(task, data);
|
|
}
|
|
|
|
static void nfs_writeback_release_common(void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
struct nfs_pgio_header *hdr = data->header;
|
|
int status = data->task.tk_status;
|
|
|
|
if ((status >= 0) && nfs_write_need_commit(data)) {
|
|
spin_lock(&hdr->lock);
|
|
if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags))
|
|
; /* Do nothing */
|
|
else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags))
|
|
memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf));
|
|
else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf)))
|
|
set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
|
|
spin_unlock(&hdr->lock);
|
|
}
|
|
nfs_writedata_release(data);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_write_common_ops = {
|
|
.rpc_call_prepare = nfs_write_prepare,
|
|
.rpc_call_done = nfs_writeback_done_common,
|
|
.rpc_release = nfs_writeback_release_common,
|
|
};
|
|
|
|
|
|
/*
|
|
* This function is called when the WRITE call is complete.
|
|
*/
|
|
void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
|
|
{
|
|
struct nfs_writeargs *argp = &data->args;
|
|
struct nfs_writeres *resp = &data->res;
|
|
struct inode *inode = data->header->inode;
|
|
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(inode)->write_done(task, data);
|
|
if (status != 0)
|
|
return;
|
|
nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(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;
|
|
|
|
/* 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,
|
|
resp->verf->committed, argp->stable);
|
|
complain = jiffies + 300 * HZ;
|
|
}
|
|
}
|
|
#endif
|
|
if (task->tk_status < 0)
|
|
nfs_set_pgio_error(data->header, task->tk_status, argp->offset);
|
|
else if (resp->count < argp->count) {
|
|
static unsigned long complain;
|
|
|
|
/* This a short write! */
|
|
nfs_inc_stats(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(data->header, -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 */
|
|
data->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);
|
|
}
|
|
}
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
|
|
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_clear_bit();
|
|
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 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_PROTO(data->inode)->commit_setup(data, &msg);
|
|
|
|
dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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 = first->wb_context->dentry->d_inode;
|
|
|
|
/* 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 */
|
|
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)
|
|
{
|
|
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);
|
|
if (!cinfo->dreq) {
|
|
dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
|
|
dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
|
|
BDI_RECLAIMABLE);
|
|
}
|
|
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, data->mds_ops,
|
|
how, 0);
|
|
out_bad:
|
|
nfs_retry_commit(head, NULL, cinfo);
|
|
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;
|
|
|
|
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/%lld %d@%lld)",
|
|
req->wb_context->dentry->d_sb->s_id,
|
|
(long long)NFS_FILEID(req->wb_context->dentry->d_inode),
|
|
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);
|
|
}
|
|
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(&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->npages >> 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;
|
|
}
|
|
#else
|
|
static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
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)
|
|
{
|
|
struct writeback_control wbc = {
|
|
.sync_mode = WB_SYNC_ALL,
|
|
.nr_to_write = LONG_MAX,
|
|
.range_start = 0,
|
|
.range_end = LLONG_MAX,
|
|
};
|
|
|
|
return sync_inode(inode, &wbc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_wb_all);
|
|
|
|
int nfs_wb_page_cancel(struct inode *inode, struct page *page)
|
|
{
|
|
struct nfs_page *req;
|
|
int ret = 0;
|
|
|
|
for (;;) {
|
|
wait_on_page_writeback(page);
|
|
req = nfs_page_find_request(page);
|
|
if (req == NULL)
|
|
break;
|
|
if (nfs_lock_request(req)) {
|
|
nfs_clear_request_commit(req);
|
|
nfs_inode_remove_request(req);
|
|
/*
|
|
* In case nfs_inode_remove_request has marked the
|
|
* page as being dirty
|
|
*/
|
|
cancel_dirty_page(page, PAGE_CACHE_SIZE);
|
|
nfs_unlock_and_release_request(req);
|
|
break;
|
|
}
|
|
ret = nfs_wait_on_request(req);
|
|
nfs_release_request(req);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
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;
|
|
|
|
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;
|
|
}
|
|
if (!PagePrivate(page))
|
|
break;
|
|
ret = nfs_commit_inode(inode, FLUSH_SYNC);
|
|
if (ret < 0)
|
|
goto out_error;
|
|
}
|
|
return 0;
|
|
out_error:
|
|
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_write_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);
|
|
}
|
|
|