4 * Write file data over NFS.
6 * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
9 #include <linux/types.h>
10 #include <linux/slab.h>
12 #include <linux/pagemap.h>
13 #include <linux/file.h>
14 #include <linux/writeback.h>
15 #include <linux/swap.h>
16 #include <linux/migrate.h>
18 #include <linux/sunrpc/clnt.h>
19 #include <linux/nfs_fs.h>
20 #include <linux/nfs_mount.h>
21 #include <linux/nfs_page.h>
22 #include <linux/backing-dev.h>
23 #include <linux/export.h>
25 #include <asm/uaccess.h>
27 #include "delegation.h"
34 #define NFSDBG_FACILITY NFSDBG_PAGECACHE
36 #define MIN_POOL_WRITE (32)
37 #define MIN_POOL_COMMIT (4)
40 * Local function declarations
42 static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc,
43 struct inode *inode, int ioflags);
44 static void nfs_redirty_request(struct nfs_page *req);
45 static const struct rpc_call_ops nfs_write_partial_ops;
46 static const struct rpc_call_ops nfs_write_full_ops;
47 static const struct rpc_call_ops nfs_commit_ops;
49 static struct kmem_cache *nfs_wdata_cachep;
50 static mempool_t *nfs_wdata_mempool;
51 static mempool_t *nfs_commit_mempool;
53 struct nfs_write_data *nfs_commitdata_alloc(void)
55 struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
58 memset(p, 0, sizeof(*p));
59 INIT_LIST_HEAD(&p->pages);
63 EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
65 void nfs_commit_free(struct nfs_write_data *p)
67 if (p && (p->pagevec != &p->page_array[0]))
69 mempool_free(p, nfs_commit_mempool);
71 EXPORT_SYMBOL_GPL(nfs_commit_free);
73 struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
75 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
78 memset(p, 0, sizeof(*p));
79 INIT_LIST_HEAD(&p->pages);
80 p->npages = pagecount;
81 if (pagecount <= ARRAY_SIZE(p->page_array))
82 p->pagevec = p->page_array;
84 p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
86 mempool_free(p, nfs_wdata_mempool);
94 void nfs_writedata_free(struct nfs_write_data *p)
96 if (p && (p->pagevec != &p->page_array[0]))
98 mempool_free(p, nfs_wdata_mempool);
101 void nfs_writedata_release(struct nfs_write_data *wdata)
103 put_nfs_open_context(wdata->args.context);
104 nfs_writedata_free(wdata);
107 static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
111 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
114 static struct nfs_page *nfs_page_find_request_locked(struct page *page)
116 struct nfs_page *req = NULL;
118 if (PagePrivate(page)) {
119 req = (struct nfs_page *)page_private(page);
121 kref_get(&req->wb_kref);
126 static struct nfs_page *nfs_page_find_request(struct page *page)
128 struct inode *inode = page->mapping->host;
129 struct nfs_page *req = NULL;
131 spin_lock(&inode->i_lock);
132 req = nfs_page_find_request_locked(page);
133 spin_unlock(&inode->i_lock);
137 /* Adjust the file length if we're writing beyond the end */
138 static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
140 struct inode *inode = page->mapping->host;
144 spin_lock(&inode->i_lock);
145 i_size = i_size_read(inode);
146 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
147 if (i_size > 0 && page->index < end_index)
149 end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
152 i_size_write(inode, end);
153 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
155 spin_unlock(&inode->i_lock);
158 /* A writeback failed: mark the page as bad, and invalidate the page cache */
159 static void nfs_set_pageerror(struct page *page)
162 nfs_zap_mapping(page->mapping->host, page->mapping);
165 /* We can set the PG_uptodate flag if we see that a write request
166 * covers the full page.
168 static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
170 if (PageUptodate(page))
174 if (count != nfs_page_length(page))
176 SetPageUptodate(page);
179 static int wb_priority(struct writeback_control *wbc)
181 if (wbc->for_reclaim)
182 return FLUSH_HIGHPRI | FLUSH_STABLE;
183 if (wbc->for_kupdate || wbc->for_background)
184 return FLUSH_LOWPRI | FLUSH_COND_STABLE;
185 return FLUSH_COND_STABLE;
189 * NFS congestion control
192 int nfs_congestion_kb;
194 #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
195 #define NFS_CONGESTION_OFF_THRESH \
196 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
198 static int nfs_set_page_writeback(struct page *page)
200 int ret = test_set_page_writeback(page);
203 struct inode *inode = page->mapping->host;
204 struct nfs_server *nfss = NFS_SERVER(inode);
206 page_cache_get(page);
207 if (atomic_long_inc_return(&nfss->writeback) >
208 NFS_CONGESTION_ON_THRESH) {
209 set_bdi_congested(&nfss->backing_dev_info,
216 static void nfs_end_page_writeback(struct page *page)
218 struct inode *inode = page->mapping->host;
219 struct nfs_server *nfss = NFS_SERVER(inode);
221 end_page_writeback(page);
222 page_cache_release(page);
223 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
224 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
227 static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
229 struct inode *inode = page->mapping->host;
230 struct nfs_page *req;
233 spin_lock(&inode->i_lock);
235 req = nfs_page_find_request_locked(page);
238 if (nfs_lock_request_dontget(req))
240 /* Note: If we hold the page lock, as is the case in nfs_writepage,
241 * then the call to nfs_lock_request_dontget() will always
242 * succeed provided that someone hasn't already marked the
243 * request as dirty (in which case we don't care).
245 spin_unlock(&inode->i_lock);
247 ret = nfs_wait_on_request(req);
250 nfs_release_request(req);
253 spin_lock(&inode->i_lock);
255 spin_unlock(&inode->i_lock);
260 * Find an associated nfs write request, and prepare to flush it out
261 * May return an error if the user signalled nfs_wait_on_request().
263 static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
264 struct page *page, bool nonblock)
266 struct nfs_page *req;
269 req = nfs_find_and_lock_request(page, nonblock);
276 ret = nfs_set_page_writeback(page);
278 BUG_ON(test_bit(PG_CLEAN, &req->wb_flags));
280 if (!nfs_pageio_add_request(pgio, req)) {
281 nfs_redirty_request(req);
282 ret = pgio->pg_error;
288 static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
290 struct inode *inode = page->mapping->host;
293 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
294 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
296 nfs_pageio_cond_complete(pgio, page->index);
297 ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
298 if (ret == -EAGAIN) {
299 redirty_page_for_writepage(wbc, page);
306 * Write an mmapped page to the server.
308 static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
310 struct nfs_pageio_descriptor pgio;
313 nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc));
314 err = nfs_do_writepage(page, wbc, &pgio);
315 nfs_pageio_complete(&pgio);
318 if (pgio.pg_error < 0)
319 return pgio.pg_error;
323 int nfs_writepage(struct page *page, struct writeback_control *wbc)
327 ret = nfs_writepage_locked(page, wbc);
332 static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
336 ret = nfs_do_writepage(page, wbc, data);
341 int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
343 struct inode *inode = mapping->host;
344 unsigned long *bitlock = &NFS_I(inode)->flags;
345 struct nfs_pageio_descriptor pgio;
348 /* Stop dirtying of new pages while we sync */
349 err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
350 nfs_wait_bit_killable, TASK_KILLABLE);
354 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
356 nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
357 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
358 nfs_pageio_complete(&pgio);
360 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
361 smp_mb__after_clear_bit();
362 wake_up_bit(bitlock, NFS_INO_FLUSHING);
375 * Insert a write request into an inode
377 static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
379 struct nfs_inode *nfsi = NFS_I(inode);
381 /* Lock the request! */
382 nfs_lock_request_dontget(req);
384 spin_lock(&inode->i_lock);
385 if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE))
387 set_bit(PG_MAPPED, &req->wb_flags);
388 SetPagePrivate(req->wb_page);
389 set_page_private(req->wb_page, (unsigned long)req);
391 kref_get(&req->wb_kref);
392 spin_unlock(&inode->i_lock);
396 * Remove a write request from an inode
398 static void nfs_inode_remove_request(struct nfs_page *req)
400 struct inode *inode = req->wb_context->dentry->d_inode;
401 struct nfs_inode *nfsi = NFS_I(inode);
403 BUG_ON (!NFS_WBACK_BUSY(req));
405 spin_lock(&inode->i_lock);
406 set_page_private(req->wb_page, 0);
407 ClearPagePrivate(req->wb_page);
408 clear_bit(PG_MAPPED, &req->wb_flags);
410 spin_unlock(&inode->i_lock);
411 nfs_release_request(req);
415 nfs_mark_request_dirty(struct nfs_page *req)
417 __set_page_dirty_nobuffers(req->wb_page);
420 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
422 * nfs_request_add_commit_list - add request to a commit list
423 * @req: pointer to a struct nfs_page
424 * @head: commit list head
426 * This sets the PG_CLEAN bit, updates the inode global count of
427 * number of outstanding requests requiring a commit as well as
430 * The caller must _not_ hold the inode->i_lock, but must be
431 * holding the nfs_page lock.
434 nfs_request_add_commit_list(struct nfs_page *req, struct list_head *head)
436 struct inode *inode = req->wb_context->dentry->d_inode;
438 set_bit(PG_CLEAN, &(req)->wb_flags);
439 spin_lock(&inode->i_lock);
440 nfs_list_add_request(req, head);
441 NFS_I(inode)->ncommit++;
442 spin_unlock(&inode->i_lock);
443 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
444 inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE);
445 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
447 EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
450 * nfs_request_remove_commit_list - Remove request from a commit list
451 * @req: pointer to a nfs_page
453 * This clears the PG_CLEAN bit, and updates the inode global count of
454 * number of outstanding requests requiring a commit
455 * It does not update the MM page stats.
457 * The caller _must_ hold the inode->i_lock and the nfs_page lock.
460 nfs_request_remove_commit_list(struct nfs_page *req)
462 struct inode *inode = req->wb_context->dentry->d_inode;
464 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
466 nfs_list_remove_request(req);
467 NFS_I(inode)->ncommit--;
469 EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
473 * Add a request to the inode's commit list.
476 nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
478 struct inode *inode = req->wb_context->dentry->d_inode;
480 if (pnfs_mark_request_commit(req, lseg))
482 nfs_request_add_commit_list(req, &NFS_I(inode)->commit_list);
486 nfs_clear_page_commit(struct page *page)
488 dec_zone_page_state(page, NR_UNSTABLE_NFS);
489 dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
493 nfs_clear_request_commit(struct nfs_page *req)
495 if (test_bit(PG_CLEAN, &req->wb_flags)) {
496 struct inode *inode = req->wb_context->dentry->d_inode;
498 if (!pnfs_clear_request_commit(req)) {
499 spin_lock(&inode->i_lock);
500 nfs_request_remove_commit_list(req);
501 spin_unlock(&inode->i_lock);
503 nfs_clear_page_commit(req->wb_page);
508 int nfs_write_need_commit(struct nfs_write_data *data)
510 if (data->verf.committed == NFS_DATA_SYNC)
511 return data->lseg == NULL;
513 return data->verf.committed != NFS_FILE_SYNC;
517 int nfs_reschedule_unstable_write(struct nfs_page *req,
518 struct nfs_write_data *data)
520 if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) {
521 nfs_mark_request_commit(req, data->lseg);
524 if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) {
525 nfs_mark_request_dirty(req);
532 nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
537 nfs_clear_request_commit(struct nfs_page *req)
542 int nfs_write_need_commit(struct nfs_write_data *data)
548 int nfs_reschedule_unstable_write(struct nfs_page *req,
549 struct nfs_write_data *data)
555 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
557 nfs_need_commit(struct nfs_inode *nfsi)
559 return nfsi->ncommit > 0;
562 /* i_lock held by caller */
564 nfs_scan_commit_list(struct list_head *src, struct list_head *dst, int max,
567 struct nfs_page *req, *tmp;
570 list_for_each_entry_safe(req, tmp, src, wb_list) {
571 if (!nfs_lock_request(req))
573 if (cond_resched_lock(lock))
574 list_safe_reset_next(req, tmp, wb_list);
575 nfs_request_remove_commit_list(req);
576 nfs_list_add_request(req, dst);
585 * nfs_scan_commit - Scan an inode for commit requests
586 * @inode: NFS inode to scan
587 * @dst: destination list
589 * Moves requests from the inode's 'commit' request list.
590 * The requests are *not* checked to ensure that they form a contiguous set.
593 nfs_scan_commit(struct inode *inode, struct list_head *dst)
595 struct nfs_inode *nfsi = NFS_I(inode);
598 spin_lock(&inode->i_lock);
599 if (nfsi->ncommit > 0) {
600 const int max = INT_MAX;
602 ret = nfs_scan_commit_list(&nfsi->commit_list, dst, max,
604 ret += pnfs_scan_commit_lists(inode, max - ret,
607 spin_unlock(&inode->i_lock);
612 static inline int nfs_need_commit(struct nfs_inode *nfsi)
617 static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst)
624 * Search for an existing write request, and attempt to update
625 * it to reflect a new dirty region on a given page.
627 * If the attempt fails, then the existing request is flushed out
630 static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
635 struct nfs_page *req;
640 if (!PagePrivate(page))
643 end = offset + bytes;
644 spin_lock(&inode->i_lock);
647 req = nfs_page_find_request_locked(page);
651 rqend = req->wb_offset + req->wb_bytes;
653 * Tell the caller to flush out the request if
654 * the offsets are non-contiguous.
655 * Note: nfs_flush_incompatible() will already
656 * have flushed out requests having wrong owners.
659 || end < req->wb_offset)
662 if (nfs_lock_request_dontget(req))
665 /* The request is locked, so wait and then retry */
666 spin_unlock(&inode->i_lock);
667 error = nfs_wait_on_request(req);
668 nfs_release_request(req);
671 spin_lock(&inode->i_lock);
674 /* Okay, the request matches. Update the region */
675 if (offset < req->wb_offset) {
676 req->wb_offset = offset;
677 req->wb_pgbase = offset;
680 req->wb_bytes = end - req->wb_offset;
682 req->wb_bytes = rqend - req->wb_offset;
684 spin_unlock(&inode->i_lock);
685 nfs_clear_request_commit(req);
688 spin_unlock(&inode->i_lock);
689 nfs_release_request(req);
690 error = nfs_wb_page(inode, page);
692 return ERR_PTR(error);
696 * Try to update an existing write request, or create one if there is none.
698 * Note: Should always be called with the Page Lock held to prevent races
699 * if we have to add a new request. Also assumes that the caller has
700 * already called nfs_flush_incompatible() if necessary.
702 static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
703 struct page *page, unsigned int offset, unsigned int bytes)
705 struct inode *inode = page->mapping->host;
706 struct nfs_page *req;
708 req = nfs_try_to_update_request(inode, page, offset, bytes);
711 req = nfs_create_request(ctx, inode, page, offset, bytes);
714 nfs_inode_add_request(inode, req);
719 static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
720 unsigned int offset, unsigned int count)
722 struct nfs_page *req;
724 req = nfs_setup_write_request(ctx, page, offset, count);
727 /* Update file length */
728 nfs_grow_file(page, offset, count);
729 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
730 nfs_mark_request_dirty(req);
731 nfs_unlock_request(req);
735 int nfs_flush_incompatible(struct file *file, struct page *page)
737 struct nfs_open_context *ctx = nfs_file_open_context(file);
738 struct nfs_page *req;
739 int do_flush, status;
741 * Look for a request corresponding to this page. If there
742 * is one, and it belongs to another file, we flush it out
743 * before we try to copy anything into the page. Do this
744 * due to the lack of an ACCESS-type call in NFSv2.
745 * Also do the same if we find a request from an existing
749 req = nfs_page_find_request(page);
752 do_flush = req->wb_page != page || req->wb_context != ctx ||
753 req->wb_lock_context->lockowner != current->files ||
754 req->wb_lock_context->pid != current->tgid;
755 nfs_release_request(req);
758 status = nfs_wb_page(page->mapping->host, page);
759 } while (status == 0);
764 * If the page cache is marked as unsafe or invalid, then we can't rely on
765 * the PageUptodate() flag. In this case, we will need to turn off
766 * write optimisations that depend on the page contents being correct.
768 static int nfs_write_pageuptodate(struct page *page, struct inode *inode)
770 return PageUptodate(page) &&
771 !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA));
775 * Update and possibly write a cached page of an NFS file.
777 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
778 * things with a page scheduled for an RPC call (e.g. invalidate it).
780 int nfs_updatepage(struct file *file, struct page *page,
781 unsigned int offset, unsigned int count)
783 struct nfs_open_context *ctx = nfs_file_open_context(file);
784 struct inode *inode = page->mapping->host;
787 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
789 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
790 file->f_path.dentry->d_parent->d_name.name,
791 file->f_path.dentry->d_name.name, count,
792 (long long)(page_offset(page) + offset));
794 /* If we're not using byte range locks, and we know the page
795 * is up to date, it may be more efficient to extend the write
796 * to cover the entire page in order to avoid fragmentation
799 if (nfs_write_pageuptodate(page, inode) &&
800 inode->i_flock == NULL &&
801 !(file->f_flags & O_DSYNC)) {
802 count = max(count + offset, nfs_page_length(page));
806 status = nfs_writepage_setup(ctx, page, offset, count);
808 nfs_set_pageerror(page);
810 __set_page_dirty_nobuffers(page);
812 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
813 status, (long long)i_size_read(inode));
817 static void nfs_writepage_release(struct nfs_page *req,
818 struct nfs_write_data *data)
820 struct page *page = req->wb_page;
822 if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req, data))
823 nfs_inode_remove_request(req);
824 nfs_unlock_request(req);
825 nfs_end_page_writeback(page);
828 static int flush_task_priority(int how)
830 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
832 return RPC_PRIORITY_HIGH;
834 return RPC_PRIORITY_LOW;
836 return RPC_PRIORITY_NORMAL;
839 int nfs_initiate_write(struct nfs_write_data *data,
840 struct rpc_clnt *clnt,
841 const struct rpc_call_ops *call_ops,
844 struct inode *inode = data->inode;
845 int priority = flush_task_priority(how);
846 struct rpc_task *task;
847 struct rpc_message msg = {
848 .rpc_argp = &data->args,
849 .rpc_resp = &data->res,
850 .rpc_cred = data->cred,
852 struct rpc_task_setup task_setup_data = {
856 .callback_ops = call_ops,
857 .callback_data = data,
858 .workqueue = nfsiod_workqueue,
859 .flags = RPC_TASK_ASYNC,
860 .priority = priority,
864 /* Set up the initial task struct. */
865 NFS_PROTO(inode)->write_setup(data, &msg);
867 dprintk("NFS: %5u initiated write call "
868 "(req %s/%lld, %u bytes @ offset %llu)\n",
871 (long long)NFS_FILEID(inode),
873 (unsigned long long)data->args.offset);
875 task = rpc_run_task(&task_setup_data);
880 if (how & FLUSH_SYNC) {
881 ret = rpc_wait_for_completion_task(task);
883 ret = task->tk_status;
889 EXPORT_SYMBOL_GPL(nfs_initiate_write);
892 * Set up the argument/result storage required for the RPC call.
894 static void nfs_write_rpcsetup(struct nfs_page *req,
895 struct nfs_write_data *data,
896 unsigned int count, unsigned int offset,
899 struct inode *inode = req->wb_context->dentry->d_inode;
901 /* Set up the RPC argument and reply structs
902 * NB: take care not to mess about with data->commit et al. */
905 data->inode = inode = req->wb_context->dentry->d_inode;
906 data->cred = req->wb_context->cred;
908 data->args.fh = NFS_FH(inode);
909 data->args.offset = req_offset(req) + offset;
910 /* pnfs_set_layoutcommit needs this */
911 data->mds_offset = data->args.offset;
912 data->args.pgbase = req->wb_pgbase + offset;
913 data->args.pages = data->pagevec;
914 data->args.count = count;
915 data->args.context = get_nfs_open_context(req->wb_context);
916 data->args.lock_context = req->wb_lock_context;
917 data->args.stable = NFS_UNSTABLE;
918 switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
921 case FLUSH_COND_STABLE:
922 if (nfs_need_commit(NFS_I(inode)))
925 data->args.stable = NFS_FILE_SYNC;
928 data->res.fattr = &data->fattr;
929 data->res.count = count;
930 data->res.verf = &data->verf;
931 nfs_fattr_init(&data->fattr);
934 static int nfs_do_write(struct nfs_write_data *data,
935 const struct rpc_call_ops *call_ops,
938 struct inode *inode = data->args.context->dentry->d_inode;
940 return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how);
943 static int nfs_do_multiple_writes(struct list_head *head,
944 const struct rpc_call_ops *call_ops,
947 struct nfs_write_data *data;
950 while (!list_empty(head)) {
953 data = list_entry(head->next, struct nfs_write_data, list);
954 list_del_init(&data->list);
956 ret2 = nfs_do_write(data, call_ops, how);
963 /* If a nfs_flush_* function fails, it should remove reqs from @head and
964 * call this on each, which will prepare them to be retried on next
965 * writeback using standard nfs.
967 static void nfs_redirty_request(struct nfs_page *req)
969 struct page *page = req->wb_page;
971 nfs_mark_request_dirty(req);
972 nfs_unlock_request(req);
973 nfs_end_page_writeback(page);
977 * Generate multiple small requests to write out a single
978 * contiguous dirty area on one page.
980 static int nfs_flush_multi(struct nfs_pageio_descriptor *desc, struct list_head *res)
982 struct nfs_page *req = nfs_list_entry(desc->pg_list.next);
983 struct page *page = req->wb_page;
984 struct nfs_write_data *data;
985 size_t wsize = desc->pg_bsize, nbytes;
990 nfs_list_remove_request(req);
992 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
993 (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit ||
994 desc->pg_count > wsize))
995 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
999 nbytes = desc->pg_count;
1001 size_t len = min(nbytes, wsize);
1003 data = nfs_writedata_alloc(1);
1006 data->pagevec[0] = page;
1007 nfs_write_rpcsetup(req, data, len, offset, desc->pg_ioflags);
1008 list_add(&data->list, res);
1012 } while (nbytes != 0);
1013 atomic_set(&req->wb_complete, requests);
1014 desc->pg_rpc_callops = &nfs_write_partial_ops;
1018 while (!list_empty(res)) {
1019 data = list_entry(res->next, struct nfs_write_data, list);
1020 list_del(&data->list);
1021 nfs_writedata_free(data);
1023 nfs_redirty_request(req);
1028 * Create an RPC task for the given write request and kick it.
1029 * The page must have been locked by the caller.
1031 * It may happen that the page we're passed is not marked dirty.
1032 * This is the case if nfs_updatepage detects a conflicting request
1033 * that has been written but not committed.
1035 static int nfs_flush_one(struct nfs_pageio_descriptor *desc, struct list_head *res)
1037 struct nfs_page *req;
1038 struct page **pages;
1039 struct nfs_write_data *data;
1040 struct list_head *head = &desc->pg_list;
1043 data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base,
1046 while (!list_empty(head)) {
1047 req = nfs_list_entry(head->next);
1048 nfs_list_remove_request(req);
1049 nfs_redirty_request(req);
1054 pages = data->pagevec;
1055 while (!list_empty(head)) {
1056 req = nfs_list_entry(head->next);
1057 nfs_list_remove_request(req);
1058 nfs_list_add_request(req, &data->pages);
1059 *pages++ = req->wb_page;
1061 req = nfs_list_entry(data->pages.next);
1063 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
1064 (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit))
1065 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1067 /* Set up the argument struct */
1068 nfs_write_rpcsetup(req, data, desc->pg_count, 0, desc->pg_ioflags);
1069 list_add(&data->list, res);
1070 desc->pg_rpc_callops = &nfs_write_full_ops;
1075 int nfs_generic_flush(struct nfs_pageio_descriptor *desc, struct list_head *head)
1077 if (desc->pg_bsize < PAGE_CACHE_SIZE)
1078 return nfs_flush_multi(desc, head);
1079 return nfs_flush_one(desc, head);
1082 static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1087 ret = nfs_generic_flush(desc, &head);
1089 ret = nfs_do_multiple_writes(&head, desc->pg_rpc_callops,
1094 static const struct nfs_pageio_ops nfs_pageio_write_ops = {
1095 .pg_test = nfs_generic_pg_test,
1096 .pg_doio = nfs_generic_pg_writepages,
1099 void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
1100 struct inode *inode, int ioflags)
1102 nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops,
1103 NFS_SERVER(inode)->wsize, ioflags);
1106 void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
1108 pgio->pg_ops = &nfs_pageio_write_ops;
1109 pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
1111 EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
1113 static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
1114 struct inode *inode, int ioflags)
1116 if (!pnfs_pageio_init_write(pgio, inode, ioflags))
1117 nfs_pageio_init_write_mds(pgio, inode, ioflags);
1121 * Handle a write reply that flushed part of a page.
1123 static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
1125 struct nfs_write_data *data = calldata;
1127 dprintk("NFS: %5u write(%s/%lld %d@%lld)",
1129 data->req->wb_context->dentry->d_inode->i_sb->s_id,
1131 NFS_FILEID(data->req->wb_context->dentry->d_inode),
1132 data->req->wb_bytes, (long long)req_offset(data->req));
1134 nfs_writeback_done(task, data);
1137 static void nfs_writeback_release_partial(void *calldata)
1139 struct nfs_write_data *data = calldata;
1140 struct nfs_page *req = data->req;
1141 struct page *page = req->wb_page;
1142 int status = data->task.tk_status;
1145 nfs_set_pageerror(page);
1146 nfs_context_set_write_error(req->wb_context, status);
1147 dprintk(", error = %d\n", status);
1151 if (nfs_write_need_commit(data)) {
1152 struct inode *inode = page->mapping->host;
1154 spin_lock(&inode->i_lock);
1155 if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) {
1156 /* Do nothing we need to resend the writes */
1157 } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) {
1158 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1159 dprintk(" defer commit\n");
1160 } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
1161 set_bit(PG_NEED_RESCHED, &req->wb_flags);
1162 clear_bit(PG_NEED_COMMIT, &req->wb_flags);
1163 dprintk(" server reboot detected\n");
1165 spin_unlock(&inode->i_lock);
1170 if (atomic_dec_and_test(&req->wb_complete))
1171 nfs_writepage_release(req, data);
1172 nfs_writedata_release(calldata);
1175 #if defined(CONFIG_NFS_V4_1)
1176 void nfs_write_prepare(struct rpc_task *task, void *calldata)
1178 struct nfs_write_data *data = calldata;
1180 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
1181 &data->args.seq_args,
1182 &data->res.seq_res, task))
1184 rpc_call_start(task);
1186 #endif /* CONFIG_NFS_V4_1 */
1188 static const struct rpc_call_ops nfs_write_partial_ops = {
1189 #if defined(CONFIG_NFS_V4_1)
1190 .rpc_call_prepare = nfs_write_prepare,
1191 #endif /* CONFIG_NFS_V4_1 */
1192 .rpc_call_done = nfs_writeback_done_partial,
1193 .rpc_release = nfs_writeback_release_partial,
1197 * Handle a write reply that flushes a whole page.
1199 * FIXME: There is an inherent race with invalidate_inode_pages and
1200 * writebacks since the page->count is kept > 1 for as long
1201 * as the page has a write request pending.
1203 static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
1205 struct nfs_write_data *data = calldata;
1207 nfs_writeback_done(task, data);
1210 static void nfs_writeback_release_full(void *calldata)
1212 struct nfs_write_data *data = calldata;
1213 int status = data->task.tk_status;
1215 /* Update attributes as result of writeback. */
1216 while (!list_empty(&data->pages)) {
1217 struct nfs_page *req = nfs_list_entry(data->pages.next);
1218 struct page *page = req->wb_page;
1220 nfs_list_remove_request(req);
1222 dprintk("NFS: %5u write (%s/%lld %d@%lld)",
1224 req->wb_context->dentry->d_inode->i_sb->s_id,
1225 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
1227 (long long)req_offset(req));
1230 nfs_set_pageerror(page);
1231 nfs_context_set_write_error(req->wb_context, status);
1232 dprintk(", error = %d\n", status);
1233 goto remove_request;
1236 if (nfs_write_need_commit(data)) {
1237 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1238 nfs_mark_request_commit(req, data->lseg);
1239 dprintk(" marked for commit\n");
1244 nfs_inode_remove_request(req);
1246 nfs_unlock_request(req);
1247 nfs_end_page_writeback(page);
1249 nfs_writedata_release(calldata);
1252 static const struct rpc_call_ops nfs_write_full_ops = {
1253 #if defined(CONFIG_NFS_V4_1)
1254 .rpc_call_prepare = nfs_write_prepare,
1255 #endif /* CONFIG_NFS_V4_1 */
1256 .rpc_call_done = nfs_writeback_done_full,
1257 .rpc_release = nfs_writeback_release_full,
1262 * This function is called when the WRITE call is complete.
1264 void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
1266 struct nfs_writeargs *argp = &data->args;
1267 struct nfs_writeres *resp = &data->res;
1270 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1271 task->tk_pid, task->tk_status);
1274 * ->write_done will attempt to use post-op attributes to detect
1275 * conflicting writes by other clients. A strict interpretation
1276 * of close-to-open would allow us to continue caching even if
1277 * another writer had changed the file, but some applications
1278 * depend on tighter cache coherency when writing.
1280 status = NFS_PROTO(data->inode)->write_done(task, data);
1283 nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
1285 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1286 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1287 /* We tried a write call, but the server did not
1288 * commit data to stable storage even though we
1290 * Note: There is a known bug in Tru64 < 5.0 in which
1291 * the server reports NFS_DATA_SYNC, but performs
1292 * NFS_FILE_SYNC. We therefore implement this checking
1293 * as a dprintk() in order to avoid filling syslog.
1295 static unsigned long complain;
1297 /* Note this will print the MDS for a DS write */
1298 if (time_before(complain, jiffies)) {
1299 dprintk("NFS: faulty NFS server %s:"
1300 " (committed = %d) != (stable = %d)\n",
1301 NFS_SERVER(data->inode)->nfs_client->cl_hostname,
1302 resp->verf->committed, argp->stable);
1303 complain = jiffies + 300 * HZ;
1307 /* Is this a short write? */
1308 if (task->tk_status >= 0 && resp->count < argp->count) {
1309 static unsigned long complain;
1311 nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
1313 /* Has the server at least made some progress? */
1314 if (resp->count != 0) {
1315 /* Was this an NFSv2 write or an NFSv3 stable write? */
1316 if (resp->verf->committed != NFS_UNSTABLE) {
1317 /* Resend from where the server left off */
1318 data->mds_offset += resp->count;
1319 argp->offset += resp->count;
1320 argp->pgbase += resp->count;
1321 argp->count -= resp->count;
1323 /* Resend as a stable write in order to avoid
1324 * headaches in the case of a server crash.
1326 argp->stable = NFS_FILE_SYNC;
1328 rpc_restart_call_prepare(task);
1331 if (time_before(complain, jiffies)) {
1333 "NFS: Server wrote zero bytes, expected %u.\n",
1335 complain = jiffies + 300 * HZ;
1337 /* Can't do anything about it except throw an error. */
1338 task->tk_status = -EIO;
1344 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1345 static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
1349 if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
1353 ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
1355 nfs_wait_bit_killable,
1357 return (ret < 0) ? ret : 1;
1360 void nfs_commit_clear_lock(struct nfs_inode *nfsi)
1362 clear_bit(NFS_INO_COMMIT, &nfsi->flags);
1363 smp_mb__after_clear_bit();
1364 wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
1366 EXPORT_SYMBOL_GPL(nfs_commit_clear_lock);
1368 void nfs_commitdata_release(void *data)
1370 struct nfs_write_data *wdata = data;
1372 put_nfs_open_context(wdata->args.context);
1373 nfs_commit_free(wdata);
1375 EXPORT_SYMBOL_GPL(nfs_commitdata_release);
1377 int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt,
1378 const struct rpc_call_ops *call_ops,
1381 struct rpc_task *task;
1382 int priority = flush_task_priority(how);
1383 struct rpc_message msg = {
1384 .rpc_argp = &data->args,
1385 .rpc_resp = &data->res,
1386 .rpc_cred = data->cred,
1388 struct rpc_task_setup task_setup_data = {
1389 .task = &data->task,
1391 .rpc_message = &msg,
1392 .callback_ops = call_ops,
1393 .callback_data = data,
1394 .workqueue = nfsiod_workqueue,
1395 .flags = RPC_TASK_ASYNC,
1396 .priority = priority,
1398 /* Set up the initial task struct. */
1399 NFS_PROTO(data->inode)->commit_setup(data, &msg);
1401 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
1403 task = rpc_run_task(&task_setup_data);
1405 return PTR_ERR(task);
1406 if (how & FLUSH_SYNC)
1407 rpc_wait_for_completion_task(task);
1411 EXPORT_SYMBOL_GPL(nfs_initiate_commit);
1414 * Set up the argument/result storage required for the RPC call.
1416 void nfs_init_commit(struct nfs_write_data *data,
1417 struct list_head *head,
1418 struct pnfs_layout_segment *lseg)
1420 struct nfs_page *first = nfs_list_entry(head->next);
1421 struct inode *inode = first->wb_context->dentry->d_inode;
1423 /* Set up the RPC argument and reply structs
1424 * NB: take care not to mess about with data->commit et al. */
1426 list_splice_init(head, &data->pages);
1428 data->inode = inode;
1429 data->cred = first->wb_context->cred;
1430 data->lseg = lseg; /* reference transferred */
1431 data->mds_ops = &nfs_commit_ops;
1433 data->args.fh = NFS_FH(data->inode);
1434 /* Note: we always request a commit of the entire inode */
1435 data->args.offset = 0;
1436 data->args.count = 0;
1437 data->args.context = get_nfs_open_context(first->wb_context);
1438 data->res.count = 0;
1439 data->res.fattr = &data->fattr;
1440 data->res.verf = &data->verf;
1441 nfs_fattr_init(&data->fattr);
1443 EXPORT_SYMBOL_GPL(nfs_init_commit);
1445 void nfs_retry_commit(struct list_head *page_list,
1446 struct pnfs_layout_segment *lseg)
1448 struct nfs_page *req;
1450 while (!list_empty(page_list)) {
1451 req = nfs_list_entry(page_list->next);
1452 nfs_list_remove_request(req);
1453 nfs_mark_request_commit(req, lseg);
1454 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
1455 dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
1457 nfs_unlock_request(req);
1460 EXPORT_SYMBOL_GPL(nfs_retry_commit);
1463 * Commit dirty pages
1466 nfs_commit_list(struct inode *inode, struct list_head *head, int how)
1468 struct nfs_write_data *data;
1470 data = nfs_commitdata_alloc();
1475 /* Set up the argument struct */
1476 nfs_init_commit(data, head, NULL);
1477 return nfs_initiate_commit(data, NFS_CLIENT(inode), data->mds_ops, how);
1479 nfs_retry_commit(head, NULL);
1480 nfs_commit_clear_lock(NFS_I(inode));
1485 * COMMIT call returned
1487 static void nfs_commit_done(struct rpc_task *task, void *calldata)
1489 struct nfs_write_data *data = calldata;
1491 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1492 task->tk_pid, task->tk_status);
1494 /* Call the NFS version-specific code */
1495 NFS_PROTO(data->inode)->commit_done(task, data);
1498 void nfs_commit_release_pages(struct nfs_write_data *data)
1500 struct nfs_page *req;
1501 int status = data->task.tk_status;
1503 while (!list_empty(&data->pages)) {
1504 req = nfs_list_entry(data->pages.next);
1505 nfs_list_remove_request(req);
1506 nfs_clear_page_commit(req->wb_page);
1508 dprintk("NFS: commit (%s/%lld %d@%lld)",
1509 req->wb_context->dentry->d_sb->s_id,
1510 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
1512 (long long)req_offset(req));
1514 nfs_context_set_write_error(req->wb_context, status);
1515 nfs_inode_remove_request(req);
1516 dprintk(", error = %d\n", status);
1520 /* Okay, COMMIT succeeded, apparently. Check the verifier
1521 * returned by the server against all stored verfs. */
1522 if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
1523 /* We have a match */
1524 nfs_inode_remove_request(req);
1528 /* We have a mismatch. Write the page again */
1529 dprintk(" mismatch\n");
1530 nfs_mark_request_dirty(req);
1532 nfs_unlock_request(req);
1535 EXPORT_SYMBOL_GPL(nfs_commit_release_pages);
1537 static void nfs_commit_release(void *calldata)
1539 struct nfs_write_data *data = calldata;
1541 nfs_commit_release_pages(data);
1542 nfs_commit_clear_lock(NFS_I(data->inode));
1543 nfs_commitdata_release(calldata);
1546 static const struct rpc_call_ops nfs_commit_ops = {
1547 #if defined(CONFIG_NFS_V4_1)
1548 .rpc_call_prepare = nfs_write_prepare,
1549 #endif /* CONFIG_NFS_V4_1 */
1550 .rpc_call_done = nfs_commit_done,
1551 .rpc_release = nfs_commit_release,
1554 int nfs_commit_inode(struct inode *inode, int how)
1557 int may_wait = how & FLUSH_SYNC;
1560 res = nfs_commit_set_lock(NFS_I(inode), may_wait);
1562 goto out_mark_dirty;
1563 res = nfs_scan_commit(inode, &head);
1567 error = pnfs_commit_list(inode, &head, how);
1568 if (error == PNFS_NOT_ATTEMPTED)
1569 error = nfs_commit_list(inode, &head, how);
1573 goto out_mark_dirty;
1574 error = wait_on_bit(&NFS_I(inode)->flags,
1576 nfs_wait_bit_killable,
1581 nfs_commit_clear_lock(NFS_I(inode));
1583 /* Note: If we exit without ensuring that the commit is complete,
1584 * we must mark the inode as dirty. Otherwise, future calls to
1585 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1586 * that the data is on the disk.
1589 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1593 static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1595 struct nfs_inode *nfsi = NFS_I(inode);
1596 int flags = FLUSH_SYNC;
1599 /* no commits means nothing needs to be done */
1603 if (wbc->sync_mode == WB_SYNC_NONE) {
1604 /* Don't commit yet if this is a non-blocking flush and there
1605 * are a lot of outstanding writes for this mapping.
1607 if (nfsi->ncommit <= (nfsi->npages >> 1))
1608 goto out_mark_dirty;
1610 /* don't wait for the COMMIT response */
1614 ret = nfs_commit_inode(inode, flags);
1616 if (wbc->sync_mode == WB_SYNC_NONE) {
1617 if (ret < wbc->nr_to_write)
1618 wbc->nr_to_write -= ret;
1620 wbc->nr_to_write = 0;
1625 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1629 static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1635 int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1639 ret = nfs_commit_unstable_pages(inode, wbc);
1640 if (ret >= 0 && test_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags)) {
1644 if (wbc->sync_mode == WB_SYNC_NONE)
1647 status = pnfs_layoutcommit_inode(inode, sync);
1655 * flush the inode to disk.
1657 int nfs_wb_all(struct inode *inode)
1659 struct writeback_control wbc = {
1660 .sync_mode = WB_SYNC_ALL,
1661 .nr_to_write = LONG_MAX,
1663 .range_end = LLONG_MAX,
1666 return sync_inode(inode, &wbc);
1669 int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1671 struct nfs_page *req;
1674 BUG_ON(!PageLocked(page));
1676 wait_on_page_writeback(page);
1677 req = nfs_page_find_request(page);
1680 if (nfs_lock_request_dontget(req)) {
1681 nfs_clear_request_commit(req);
1682 nfs_inode_remove_request(req);
1684 * In case nfs_inode_remove_request has marked the
1685 * page as being dirty
1687 cancel_dirty_page(page, PAGE_CACHE_SIZE);
1688 nfs_unlock_request(req);
1691 ret = nfs_wait_on_request(req);
1692 nfs_release_request(req);
1700 * Write back all requests on one page - we do this before reading it.
1702 int nfs_wb_page(struct inode *inode, struct page *page)
1704 loff_t range_start = page_offset(page);
1705 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
1706 struct writeback_control wbc = {
1707 .sync_mode = WB_SYNC_ALL,
1709 .range_start = range_start,
1710 .range_end = range_end,
1715 wait_on_page_writeback(page);
1716 if (clear_page_dirty_for_io(page)) {
1717 ret = nfs_writepage_locked(page, &wbc);
1722 if (!PagePrivate(page))
1724 ret = nfs_commit_inode(inode, FLUSH_SYNC);
1733 #ifdef CONFIG_MIGRATION
1734 int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
1735 struct page *page, enum migrate_mode mode)
1738 * If PagePrivate is set, then the page is currently associated with
1739 * an in-progress read or write request. Don't try to migrate it.
1741 * FIXME: we could do this in principle, but we'll need a way to ensure
1742 * that we can safely release the inode reference while holding
1745 if (PagePrivate(page))
1748 nfs_fscache_release_page(page, GFP_KERNEL);
1750 return migrate_page(mapping, newpage, page, mode);
1754 int __init nfs_init_writepagecache(void)
1756 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
1757 sizeof(struct nfs_write_data),
1758 0, SLAB_HWCACHE_ALIGN,
1760 if (nfs_wdata_cachep == NULL)
1763 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1765 if (nfs_wdata_mempool == NULL)
1768 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
1770 if (nfs_commit_mempool == NULL)
1774 * NFS congestion size, scale with available memory.
1786 * This allows larger machines to have larger/more transfers.
1787 * Limit the default to 256M
1789 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1790 if (nfs_congestion_kb > 256*1024)
1791 nfs_congestion_kb = 256*1024;
1796 void nfs_destroy_writepagecache(void)
1798 mempool_destroy(nfs_commit_mempool);
1799 mempool_destroy(nfs_wdata_mempool);
1800 kmem_cache_destroy(nfs_wdata_cachep);