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70b9ecbdb9
The SuS states that a call to write() will cause mtime to be updated on the file. In order to satisfy that requirement, we need to flush out any cached writes in nfs_getattr(). Speed things up slightly by not committing the writes. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1434 lines
37 KiB
C
1434 lines
37 KiB
C
/*
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* linux/fs/nfs/write.c
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*
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* Writing file data over NFS.
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*
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* We do it like this: When a (user) process wishes to write data to an
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* NFS file, a write request is allocated that contains the RPC task data
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* plus some info on the page to be written, and added to the inode's
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* write chain. If the process writes past the end of the page, an async
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* RPC call to write the page is scheduled immediately; otherwise, the call
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* is delayed for a few seconds.
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*
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* Just like readahead, no async I/O is performed if wsize < PAGE_SIZE.
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*
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* Write requests are kept on the inode's writeback list. Each entry in
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* that list references the page (portion) to be written. When the
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* cache timeout has expired, the RPC task is woken up, and tries to
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* lock the page. As soon as it manages to do so, the request is moved
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* from the writeback list to the writelock list.
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*
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* Note: we must make sure never to confuse the inode passed in the
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* write_page request with the one in page->inode. As far as I understand
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* it, these are different when doing a swap-out.
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*
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* To understand everything that goes on here and in the NFS read code,
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* one should be aware that a page is locked in exactly one of the following
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* cases:
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*
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* - A write request is in progress.
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* - A user process is in generic_file_write/nfs_update_page
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* - A user process is in generic_file_read
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*
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* Also note that because of the way pages are invalidated in
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* nfs_revalidate_inode, the following assertions hold:
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*
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* - If a page is dirty, there will be no read requests (a page will
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* not be re-read unless invalidated by nfs_revalidate_inode).
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* - If the page is not uptodate, there will be no pending write
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* requests, and no process will be in nfs_update_page.
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*
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* FIXME: Interaction with the vmscan routines is not optimal yet.
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* Either vmscan must be made nfs-savvy, or we need a different page
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* reclaim concept that supports something like FS-independent
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* buffer_heads with a b_ops-> field.
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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/config.h>
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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/mpage.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 <asm/uaccess.h>
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#include <linux/smp_lock.h>
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#include "delegation.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 inode *,
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struct page *,
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unsigned int, unsigned int);
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static void nfs_writeback_done_partial(struct nfs_write_data *, int);
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static void nfs_writeback_done_full(struct nfs_write_data *, int);
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static int nfs_wait_on_write_congestion(struct address_space *, int);
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static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int);
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static int nfs_flush_inode(struct inode *inode, unsigned long idx_start,
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unsigned int npages, int how);
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static kmem_cache_t *nfs_wdata_cachep;
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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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static inline struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount)
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{
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struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_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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if (pagecount < NFS_PAGEVEC_SIZE)
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p->pagevec = &p->page_array[0];
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else {
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size_t size = ++pagecount * sizeof(struct page *);
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p->pagevec = kmalloc(size, GFP_NOFS);
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if (p->pagevec) {
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memset(p->pagevec, 0, size);
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} else {
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mempool_free(p, nfs_commit_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 inline void nfs_commit_free(struct nfs_write_data *p)
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{
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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_writedata_release(void *wdata)
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{
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nfs_writedata_free(wdata);
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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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i_size_write(inode, end);
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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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loff_t end_offs;
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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 == PAGE_CACHE_SIZE) {
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SetPageUptodate(page);
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return;
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}
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end_offs = i_size_read(page->mapping->host) - 1;
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if (end_offs < 0)
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return;
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/* Is this the last page? */
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if (page->index != (unsigned long)(end_offs >> PAGE_CACHE_SHIFT))
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return;
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/* This is the last page: set PG_uptodate if we cover the entire
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* extent of the data, then zero the rest of the page.
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*/
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if (count == (unsigned int)(end_offs & (PAGE_CACHE_SIZE - 1)) + 1) {
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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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}
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/*
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* Write a page synchronously.
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* Offset is the data offset within the page.
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*/
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static int nfs_writepage_sync(struct nfs_open_context *ctx, struct inode *inode,
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struct page *page, unsigned int offset, unsigned int count,
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int how)
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{
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unsigned int wsize = NFS_SERVER(inode)->wsize;
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int result, written = 0;
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struct nfs_write_data *wdata;
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wdata = nfs_writedata_alloc(1);
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if (!wdata)
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return -ENOMEM;
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wdata->flags = how;
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wdata->cred = ctx->cred;
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wdata->inode = inode;
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wdata->args.fh = NFS_FH(inode);
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wdata->args.context = ctx;
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wdata->args.pages = &page;
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wdata->args.stable = NFS_FILE_SYNC;
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wdata->args.pgbase = offset;
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wdata->args.count = wsize;
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wdata->res.fattr = &wdata->fattr;
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wdata->res.verf = &wdata->verf;
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dprintk("NFS: nfs_writepage_sync(%s/%Ld %d@%Ld)\n",
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inode->i_sb->s_id,
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(long long)NFS_FILEID(inode),
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count, (long long)(page_offset(page) + offset));
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set_page_writeback(page);
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nfs_begin_data_update(inode);
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do {
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if (count < wsize)
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wdata->args.count = count;
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wdata->args.offset = page_offset(page) + wdata->args.pgbase;
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result = NFS_PROTO(inode)->write(wdata);
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if (result < 0) {
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/* Must mark the page invalid after I/O error */
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ClearPageUptodate(page);
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goto io_error;
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}
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if (result < wdata->args.count)
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printk(KERN_WARNING "NFS: short write, count=%u, result=%d\n",
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wdata->args.count, result);
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wdata->args.offset += result;
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wdata->args.pgbase += result;
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written += result;
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count -= result;
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} while (count);
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/* Update file length */
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nfs_grow_file(page, offset, written);
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/* Set the PG_uptodate flag? */
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nfs_mark_uptodate(page, offset, written);
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if (PageError(page))
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ClearPageError(page);
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io_error:
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nfs_end_data_update(inode);
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end_page_writeback(page);
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nfs_writedata_free(wdata);
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return written ? written : result;
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}
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static int nfs_writepage_async(struct nfs_open_context *ctx,
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struct inode *inode, 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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req = nfs_update_request(ctx, inode, page, offset, count);
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if (IS_ERR(req))
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return PTR_ERR(req);
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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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* Write an mmapped page to the server.
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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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struct nfs_open_context *ctx;
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struct inode *inode = page->mapping->host;
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unsigned long end_index;
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unsigned offset = PAGE_CACHE_SIZE;
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loff_t i_size = i_size_read(inode);
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int inode_referenced = 0;
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int priority = wb_priority(wbc);
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int err;
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/*
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* Note: We need to ensure that we have a reference to the inode
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* if we are to do asynchronous writes. If not, waiting
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* in nfs_wait_on_request() may deadlock with clear_inode().
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*
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* If igrab() fails here, then it is in any case safe to
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* call nfs_wb_page(), since there will be no pending writes.
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*/
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if (igrab(inode) != 0)
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inode_referenced = 1;
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end_index = i_size >> PAGE_CACHE_SHIFT;
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/* Ensure we've flushed out any previous writes */
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nfs_wb_page_priority(inode, page, priority);
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/* easy case */
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if (page->index < end_index)
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goto do_it;
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/* things got complicated... */
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offset = i_size & (PAGE_CACHE_SIZE-1);
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/* OK, are we completely out? */
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err = 0; /* potential race with truncate - ignore */
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if (page->index >= end_index+1 || !offset)
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goto out;
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do_it:
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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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lock_kernel();
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if (!IS_SYNC(inode) && inode_referenced) {
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err = nfs_writepage_async(ctx, inode, page, 0, offset);
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if (!wbc->for_writepages)
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nfs_flush_inode(inode, 0, 0, wb_priority(wbc));
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} else {
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err = nfs_writepage_sync(ctx, inode, page, 0,
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offset, priority);
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if (err >= 0) {
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if (err != offset)
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redirty_page_for_writepage(wbc, page);
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err = 0;
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}
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}
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unlock_kernel();
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put_nfs_open_context(ctx);
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out:
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unlock_page(page);
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if (inode_referenced)
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iput(inode);
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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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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_inode(inode, 0, 0, wb_priority(wbc));
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if (err < 0)
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goto out;
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wbc->nr_to_write -= err;
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if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) {
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err = nfs_wait_on_requests(inode, 0, 0);
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if (err < 0)
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goto out;
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}
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err = nfs_commit_inode(inode, wb_priority(wbc));
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if (err > 0) {
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wbc->nr_to_write -= err;
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err = 0;
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}
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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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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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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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/*
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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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|
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spin_lock(&nfsi->req_lock);
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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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/*
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* Find a request
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*/
|
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static inline struct nfs_page *
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_nfs_find_request(struct inode *inode, unsigned long index)
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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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req = (struct nfs_page*)radix_tree_lookup(&nfsi->nfs_page_tree, index);
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if (req)
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atomic_inc(&req->wb_count);
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return req;
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}
|
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|
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static struct nfs_page *
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nfs_find_request(struct inode *inode, unsigned long index)
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{
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struct nfs_page *req;
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struct nfs_inode *nfsi = NFS_I(inode);
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|
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spin_lock(&nfsi->req_lock);
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req = _nfs_find_request(inode, index);
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spin_unlock(&nfsi->req_lock);
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return req;
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}
|
|
|
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/*
|
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* Add a request to the inode's dirty list.
|
|
*/
|
|
static void
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nfs_mark_request_dirty(struct nfs_page *req)
|
|
{
|
|
struct inode *inode = req->wb_context->dentry->d_inode;
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struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
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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inc_page_state(nr_dirty);
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mark_inode_dirty(inode);
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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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struct nfs_inode *nfsi = NFS_I(req->wb_context->dentry->d_inode);
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return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty;
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}
|
|
|
|
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
|
|
/*
|
|
* Add a request to the inode's commit list.
|
|
*/
|
|
static void
|
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nfs_mark_request_commit(struct nfs_page *req)
|
|
{
|
|
struct inode *inode = req->wb_context->dentry->d_inode;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
spin_lock(&nfsi->req_lock);
|
|
nfs_list_add_request(req, &nfsi->commit);
|
|
nfsi->ncommit++;
|
|
spin_unlock(&nfsi->req_lock);
|
|
inc_page_state(nr_unstable);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Wait for a request to complete.
|
|
*
|
|
* Interruptible by signals only if mounted with intr flag.
|
|
*/
|
|
static int
|
|
nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_page *req;
|
|
unsigned long idx_end, next;
|
|
unsigned int res = 0;
|
|
int error;
|
|
|
|
if (npages == 0)
|
|
idx_end = ~0;
|
|
else
|
|
idx_end = idx_start + npages - 1;
|
|
|
|
spin_lock(&nfsi->req_lock);
|
|
next = idx_start;
|
|
while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) {
|
|
if (req->wb_index > idx_end)
|
|
break;
|
|
|
|
next = req->wb_index + 1;
|
|
BUG_ON(!NFS_WBACK_BUSY(req));
|
|
|
|
atomic_inc(&req->wb_count);
|
|
spin_unlock(&nfsi->req_lock);
|
|
error = nfs_wait_on_request(req);
|
|
nfs_release_request(req);
|
|
if (error < 0)
|
|
return error;
|
|
spin_lock(&nfsi->req_lock);
|
|
res++;
|
|
}
|
|
spin_unlock(&nfsi->req_lock);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* nfs_scan_dirty - Scan an inode for dirty 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 dirty page list.
|
|
* The requests are *not* checked to ensure that they form a contiguous set.
|
|
*/
|
|
static int
|
|
nfs_scan_dirty(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->ndirty != 0) {
|
|
res = nfs_scan_lock_dirty(nfsi, dst, idx_start, npages);
|
|
nfsi->ndirty -= res;
|
|
sub_page_state(nr_dirty,res);
|
|
if ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty))
|
|
printk(KERN_ERR "NFS: desynchronized value of nfs_i.ndirty.\n");
|
|
}
|
|
return res;
|
|
}
|
|
|
|
#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->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;
|
|
}
|
|
#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;
|
|
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 inode *inode, struct page *page,
|
|
unsigned int offset, unsigned int bytes)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
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, server->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_find_request(inode, page->index);
|
|
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)
|
|
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);
|
|
nfs_mark_request_dirty(new);
|
|
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 inode *inode = page->mapping->host;
|
|
struct nfs_page *req;
|
|
int status = 0;
|
|
/*
|
|
* 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.
|
|
*/
|
|
req = nfs_find_request(inode, page->index);
|
|
if (req) {
|
|
if (req->wb_page != page || ctx != req->wb_context)
|
|
status = nfs_wb_page(inode, page);
|
|
nfs_release_request(req);
|
|
}
|
|
return (status < 0) ? status : 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 = (struct nfs_open_context *)file->private_data;
|
|
struct inode *inode = page->mapping->host;
|
|
struct nfs_page *req;
|
|
int status = 0;
|
|
|
|
dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
|
|
file->f_dentry->d_parent->d_name.name,
|
|
file->f_dentry->d_name.name, count,
|
|
(long long)(page_offset(page) +offset));
|
|
|
|
if (IS_SYNC(inode)) {
|
|
status = nfs_writepage_sync(ctx, inode, page, offset, count, 0);
|
|
if (status > 0) {
|
|
if (offset == 0 && status == PAGE_CACHE_SIZE)
|
|
SetPageUptodate(page);
|
|
return 0;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/* 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)) {
|
|
loff_t end_offs = i_size_read(inode) - 1;
|
|
unsigned long end_index = end_offs >> PAGE_CACHE_SHIFT;
|
|
|
|
count += offset;
|
|
offset = 0;
|
|
if (unlikely(end_offs < 0)) {
|
|
/* Do nothing */
|
|
} else if (page->index == end_index) {
|
|
unsigned int pglen;
|
|
pglen = (unsigned int)(end_offs & (PAGE_CACHE_SIZE-1)) + 1;
|
|
if (count < pglen)
|
|
count = pglen;
|
|
} else if (page->index < end_index)
|
|
count = PAGE_CACHE_SIZE;
|
|
}
|
|
|
|
/*
|
|
* Try to find an NFS request corresponding to this page
|
|
* and update it.
|
|
* If the existing request cannot be updated, we must flush
|
|
* it out now.
|
|
*/
|
|
do {
|
|
req = nfs_update_request(ctx, inode, page, offset, count);
|
|
status = (IS_ERR(req)) ? PTR_ERR(req) : 0;
|
|
if (status != -EBUSY)
|
|
break;
|
|
/* Request could not be updated. Flush it out and try again */
|
|
status = nfs_wb_page(inode, page);
|
|
} while (status >= 0);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
status = 0;
|
|
|
|
/* Update file length */
|
|
nfs_grow_file(page, offset, count);
|
|
/* Set the PG_uptodate flag? */
|
|
nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
|
|
nfs_unlock_request(req);
|
|
done:
|
|
dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
|
|
status, (long long)i_size_read(inode));
|
|
if (status < 0)
|
|
ClearPageUptodate(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_mark_request_dirty(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,
|
|
unsigned int count, unsigned int offset,
|
|
int how)
|
|
{
|
|
struct inode *inode;
|
|
|
|
/* 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);
|
|
|
|
NFS_PROTO(inode)->write_setup(data, how);
|
|
|
|
data->task.tk_priority = flush_task_priority(how);
|
|
data->task.tk_cookie = (unsigned long)inode;
|
|
|
|
dprintk("NFS: %4d 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);
|
|
lock_kernel();
|
|
rpc_execute(&data->task);
|
|
unlock_kernel();
|
|
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 list_head *head, struct inode *inode, int how)
|
|
{
|
|
struct nfs_page *req = nfs_list_entry(head->next);
|
|
struct page *page = req->wb_page;
|
|
struct nfs_write_data *data;
|
|
unsigned int wsize = NFS_SERVER(inode)->wsize;
|
|
unsigned int nbytes, offset;
|
|
int requests = 0;
|
|
LIST_HEAD(list);
|
|
|
|
nfs_list_remove_request(req);
|
|
|
|
nbytes = req->wb_bytes;
|
|
for (;;) {
|
|
data = nfs_writedata_alloc(1);
|
|
if (!data)
|
|
goto out_bad;
|
|
list_add(&data->pages, &list);
|
|
requests++;
|
|
if (nbytes <= wsize)
|
|
break;
|
|
nbytes -= wsize;
|
|
}
|
|
atomic_set(&req->wb_complete, requests);
|
|
|
|
ClearPageError(page);
|
|
set_page_writeback(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;
|
|
data->complete = nfs_writeback_done_partial;
|
|
|
|
if (nbytes > wsize) {
|
|
nfs_write_rpcsetup(req, data, wsize, offset, how);
|
|
offset += wsize;
|
|
nbytes -= wsize;
|
|
} else {
|
|
nfs_write_rpcsetup(req, data, 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_free(data);
|
|
}
|
|
nfs_mark_request_dirty(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 list_head *head, struct inode *inode, int how)
|
|
{
|
|
struct nfs_page *req;
|
|
struct page **pages;
|
|
struct nfs_write_data *data;
|
|
unsigned int count;
|
|
|
|
if (NFS_SERVER(inode)->wsize < PAGE_CACHE_SIZE)
|
|
return nfs_flush_multi(head, inode, how);
|
|
|
|
data = nfs_writedata_alloc(NFS_SERVER(inode)->wpages);
|
|
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);
|
|
set_page_writeback(req->wb_page);
|
|
*pages++ = req->wb_page;
|
|
count += req->wb_bytes;
|
|
}
|
|
req = nfs_list_entry(data->pages.next);
|
|
|
|
data->complete = nfs_writeback_done_full;
|
|
/* Set up the argument struct */
|
|
nfs_write_rpcsetup(req, data, 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_mark_request_dirty(req);
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int
|
|
nfs_flush_list(struct list_head *head, int wpages, int how)
|
|
{
|
|
LIST_HEAD(one_request);
|
|
struct nfs_page *req;
|
|
int error = 0;
|
|
unsigned int pages = 0;
|
|
|
|
while (!list_empty(head)) {
|
|
pages += nfs_coalesce_requests(head, &one_request, wpages);
|
|
req = nfs_list_entry(one_request.next);
|
|
error = nfs_flush_one(&one_request, req->wb_context->dentry->d_inode, how);
|
|
if (error < 0)
|
|
break;
|
|
}
|
|
if (error >= 0)
|
|
return pages;
|
|
|
|
while (!list_empty(head)) {
|
|
req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_mark_request_dirty(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 nfs_write_data *data, int status)
|
|
{
|
|
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 (status < 0) {
|
|
ClearPageUptodate(page);
|
|
SetPageError(page);
|
|
req->wb_context->error = status;
|
|
dprintk(", error = %d\n", 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);
|
|
}
|
|
|
|
/*
|
|
* 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 nfs_write_data *data, int status)
|
|
{
|
|
struct nfs_page *req;
|
|
struct page *page;
|
|
|
|
/* 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 (status < 0) {
|
|
ClearPageUptodate(page);
|
|
SetPageError(page);
|
|
req->wb_context->error = status;
|
|
end_page_writeback(page);
|
|
nfs_inode_remove_request(req);
|
|
dprintk(", error = %d\n", 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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function is called when the WRITE call is complete.
|
|
*/
|
|
void nfs_writeback_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
struct nfs_writeargs *argp = &data->args;
|
|
struct nfs_writeres *resp = &data->res;
|
|
|
|
dprintk("NFS: %4d nfs_writeback_done (status %d)\n",
|
|
task->tk_pid, task->tk_status);
|
|
|
|
#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)->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;
|
|
|
|
/* 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;
|
|
}
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Process the nfs_page list
|
|
*/
|
|
data->complete(data, task->tk_status);
|
|
}
|
|
|
|
|
|
#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;
|
|
|
|
/* 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);
|
|
|
|
NFS_PROTO(inode)->commit_setup(data, how);
|
|
|
|
data->task.tk_priority = flush_task_priority(how);
|
|
data->task.tk_cookie = (unsigned long)inode;
|
|
|
|
dprintk("NFS: %4d 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(NFS_SERVER(inode)->wpages);
|
|
|
|
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);
|
|
nfs_clear_page_writeback(req);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* COMMIT call returned
|
|
*/
|
|
void nfs_commit_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
struct nfs_page *req;
|
|
int res = 0;
|
|
|
|
dprintk("NFS: %4d nfs_commit_done (status %d)\n",
|
|
task->tk_pid, task->tk_status);
|
|
|
|
while (!list_empty(&data->pages)) {
|
|
req = nfs_list_entry(data->pages.next);
|
|
nfs_list_remove_request(req);
|
|
|
|
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_mark_request_dirty(req);
|
|
next:
|
|
nfs_clear_page_writeback(req);
|
|
res++;
|
|
}
|
|
sub_page_state(nr_unstable,res);
|
|
}
|
|
#endif
|
|
|
|
static int nfs_flush_inode(struct inode *inode, unsigned long idx_start,
|
|
unsigned int npages, int how)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
LIST_HEAD(head);
|
|
int res,
|
|
error = 0;
|
|
|
|
spin_lock(&nfsi->req_lock);
|
|
res = nfs_scan_dirty(inode, &head, idx_start, npages);
|
|
spin_unlock(&nfsi->req_lock);
|
|
if (res) {
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
|
|
/* For single writes, FLUSH_STABLE is more efficient */
|
|
if (res == nfsi->npages && nfsi->npages <= server->wpages) {
|
|
if (res > 1 || nfs_list_entry(head.next)->wb_bytes <= server->wsize)
|
|
how |= FLUSH_STABLE;
|
|
}
|
|
error = nfs_flush_list(&head, server->wpages, 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,
|
|
error = 0;
|
|
|
|
spin_lock(&nfsi->req_lock);
|
|
res = nfs_scan_commit(inode, &head, 0, 0);
|
|
spin_unlock(&nfsi->req_lock);
|
|
if (res) {
|
|
error = nfs_commit_list(inode, &head, how);
|
|
if (error < 0)
|
|
return error;
|
|
}
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
int nfs_sync_inode(struct inode *inode, unsigned long idx_start,
|
|
unsigned int npages, int how)
|
|
{
|
|
int nocommit = how & FLUSH_NOCOMMIT;
|
|
int wait = how & FLUSH_WAIT;
|
|
int error;
|
|
|
|
how &= ~(FLUSH_WAIT|FLUSH_NOCOMMIT);
|
|
|
|
do {
|
|
if (wait) {
|
|
error = nfs_wait_on_requests(inode, idx_start, npages);
|
|
if (error != 0)
|
|
continue;
|
|
}
|
|
error = nfs_flush_inode(inode, idx_start, npages, how);
|
|
if (error != 0)
|
|
continue;
|
|
if (!nocommit)
|
|
error = nfs_commit_inode(inode, how);
|
|
} while (error > 0);
|
|
return error;
|
|
}
|
|
|
|
int 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(MIN_POOL_WRITE,
|
|
mempool_alloc_slab,
|
|
mempool_free_slab,
|
|
nfs_wdata_cachep);
|
|
if (nfs_wdata_mempool == NULL)
|
|
return -ENOMEM;
|
|
|
|
nfs_commit_mempool = mempool_create(MIN_POOL_COMMIT,
|
|
mempool_alloc_slab,
|
|
mempool_free_slab,
|
|
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);
|
|
if (kmem_cache_destroy(nfs_wdata_cachep))
|
|
printk(KERN_INFO "nfs_write_data: not all structures were freed\n");
|
|
}
|
|
|