Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/write.c |
| 3 | * |
Trond Myklebust | 7c85d90 | 2006-12-13 15:23:48 -0500 | [diff] [blame] | 4 | * Write file data over NFS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/types.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/pagemap.h> |
| 13 | #include <linux/file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/writeback.h> |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 15 | #include <linux/swap.h> |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 16 | #include <linux/migrate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include <linux/sunrpc/clnt.h> |
| 19 | #include <linux/nfs_fs.h> |
| 20 | #include <linux/nfs_mount.h> |
| 21 | #include <linux/nfs_page.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 22 | #include <linux/backing-dev.h> |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include "delegation.h" |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 27 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 28 | #include "iostat.h" |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 29 | #include "nfs4_fs.h" |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 30 | #include "fscache.h" |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 31 | #include "pnfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
| 34 | |
| 35 | #define MIN_POOL_WRITE (32) |
| 36 | #define MIN_POOL_COMMIT (4) |
| 37 | |
| 38 | /* |
| 39 | * Local function declarations |
| 40 | */ |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 41 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
| 42 | struct inode *inode, int ioflags); |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 43 | static void nfs_redirty_request(struct nfs_page *req); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 44 | static const struct rpc_call_ops nfs_write_partial_ops; |
| 45 | static const struct rpc_call_ops nfs_write_full_ops; |
| 46 | static const struct rpc_call_ops nfs_commit_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 48 | static struct kmem_cache *nfs_wdata_cachep; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 49 | static mempool_t *nfs_wdata_mempool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | static mempool_t *nfs_commit_mempool; |
| 51 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 52 | struct nfs_write_data *nfs_commitdata_alloc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | { |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 54 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | if (p) { |
| 57 | memset(p, 0, sizeof(*p)); |
| 58 | INIT_LIST_HEAD(&p->pages); |
| 59 | } |
| 60 | return p; |
| 61 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 62 | EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 64 | void nfs_commit_free(struct nfs_write_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 66 | if (p && (p->pagevec != &p->page_array[0])) |
| 67 | kfree(p->pagevec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | mempool_free(p, nfs_commit_mempool); |
| 69 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 70 | EXPORT_SYMBOL_GPL(nfs_commit_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 72 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 73 | { |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 74 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 75 | |
| 76 | if (p) { |
| 77 | memset(p, 0, sizeof(*p)); |
| 78 | INIT_LIST_HEAD(&p->pages); |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 79 | p->npages = pagecount; |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 80 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
| 81 | p->pagevec = p->page_array; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 82 | else { |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 83 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
| 84 | if (!p->pagevec) { |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 85 | mempool_free(p, nfs_wdata_mempool); |
| 86 | p = NULL; |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | return p; |
| 91 | } |
| 92 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 93 | void nfs_writedata_free(struct nfs_write_data *p) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 94 | { |
| 95 | if (p && (p->pagevec != &p->page_array[0])) |
| 96 | kfree(p->pagevec); |
| 97 | mempool_free(p, nfs_wdata_mempool); |
| 98 | } |
| 99 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 100 | static void nfs_writedata_release(struct nfs_write_data *wdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | { |
Fred Isaman | 5053aa5 | 2011-03-03 15:13:43 +0000 | [diff] [blame] | 102 | put_lseg(wdata->lseg); |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 103 | put_nfs_open_context(wdata->args.context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | nfs_writedata_free(wdata); |
| 105 | } |
| 106 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 107 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
| 108 | { |
| 109 | ctx->error = error; |
| 110 | smp_wmb(); |
| 111 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 112 | } |
| 113 | |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 114 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
| 115 | { |
| 116 | struct nfs_page *req = NULL; |
| 117 | |
| 118 | if (PagePrivate(page)) { |
| 119 | req = (struct nfs_page *)page_private(page); |
| 120 | if (req != NULL) |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 121 | kref_get(&req->wb_kref); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 122 | } |
| 123 | return req; |
| 124 | } |
| 125 | |
| 126 | static struct nfs_page *nfs_page_find_request(struct page *page) |
| 127 | { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 128 | struct inode *inode = page->mapping->host; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 129 | struct nfs_page *req = NULL; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 130 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 131 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 132 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 133 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 134 | return req; |
| 135 | } |
| 136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
| 139 | { |
| 140 | struct inode *inode = page->mapping->host; |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 141 | loff_t end, i_size; |
| 142 | pgoff_t end_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 144 | spin_lock(&inode->i_lock); |
| 145 | i_size = i_size_read(inode); |
| 146 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (i_size > 0 && page->index < end_index) |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 148 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
| 150 | if (i_size >= end) |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 151 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | i_size_write(inode, end); |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 153 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
| 154 | out: |
| 155 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 158 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
| 159 | static void nfs_set_pageerror(struct page *page) |
| 160 | { |
| 161 | SetPageError(page); |
| 162 | nfs_zap_mapping(page->mapping->host, page->mapping); |
| 163 | } |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | /* We can set the PG_uptodate flag if we see that a write request |
| 166 | * covers the full page. |
| 167 | */ |
| 168 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) |
| 169 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | if (PageUptodate(page)) |
| 171 | return; |
| 172 | if (base != 0) |
| 173 | return; |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 174 | if (count != nfs_page_length(page)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | return; |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 176 | SetPageUptodate(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | static int wb_priority(struct writeback_control *wbc) |
| 180 | { |
| 181 | if (wbc->for_reclaim) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 182 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
Wu Fengguang | b17621f | 2009-12-03 13:54:25 +0100 | [diff] [blame] | 183 | if (wbc->for_kupdate || wbc->for_background) |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 184 | return FLUSH_LOWPRI | FLUSH_COND_STABLE; |
| 185 | return FLUSH_COND_STABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 189 | * NFS congestion control |
| 190 | */ |
| 191 | |
| 192 | int nfs_congestion_kb; |
| 193 | |
| 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)) |
| 197 | |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 198 | static int nfs_set_page_writeback(struct page *page) |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 199 | { |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 200 | int ret = test_set_page_writeback(page); |
| 201 | |
| 202 | if (!ret) { |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 203 | struct inode *inode = page->mapping->host; |
| 204 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 205 | |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 206 | page_cache_get(page); |
Peter Zijlstra | 277866a | 2007-05-08 00:35:12 -0700 | [diff] [blame] | 207 | if (atomic_long_inc_return(&nfss->writeback) > |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 208 | NFS_CONGESTION_ON_THRESH) { |
| 209 | set_bdi_congested(&nfss->backing_dev_info, |
| 210 | BLK_RW_ASYNC); |
| 211 | } |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 212 | } |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 213 | return ret; |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | static void nfs_end_page_writeback(struct page *page) |
| 217 | { |
| 218 | struct inode *inode = page->mapping->host; |
| 219 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 220 | |
| 221 | end_page_writeback(page); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 222 | page_cache_release(page); |
Peter Zijlstra | c4dc4be | 2007-10-16 23:25:41 -0700 | [diff] [blame] | 223 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 224 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 225 | } |
| 226 | |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 227 | static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 228 | { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 229 | struct inode *inode = page->mapping->host; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 230 | struct nfs_page *req; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 231 | int ret; |
| 232 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 233 | spin_lock(&inode->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 234 | for (;;) { |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 235 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 236 | if (req == NULL) |
| 237 | break; |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 238 | if (nfs_set_page_tag_locked(req)) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 239 | break; |
| 240 | /* Note: If we hold the page lock, as is the case in nfs_writepage, |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 241 | * then the call to nfs_set_page_tag_locked() will always |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 242 | * succeed provided that someone hasn't already marked the |
| 243 | * request as dirty (in which case we don't care). |
| 244 | */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 245 | spin_unlock(&inode->i_lock); |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 246 | if (!nonblock) |
| 247 | ret = nfs_wait_on_request(req); |
| 248 | else |
| 249 | ret = -EAGAIN; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 250 | nfs_release_request(req); |
| 251 | if (ret != 0) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 252 | return ERR_PTR(ret); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 253 | spin_lock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 254 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 255 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 256 | return req; |
| 257 | } |
| 258 | |
| 259 | /* |
| 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(). |
| 262 | */ |
| 263 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 264 | struct page *page, bool nonblock) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 265 | { |
| 266 | struct nfs_page *req; |
| 267 | int ret = 0; |
| 268 | |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 269 | req = nfs_find_and_lock_request(page, nonblock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 270 | if (!req) |
| 271 | goto out; |
| 272 | ret = PTR_ERR(req); |
| 273 | if (IS_ERR(req)) |
| 274 | goto out; |
| 275 | |
| 276 | ret = nfs_set_page_writeback(page); |
| 277 | BUG_ON(ret != 0); |
| 278 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); |
| 279 | |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 280 | if (!nfs_pageio_add_request(pgio, req)) { |
| 281 | nfs_redirty_request(req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 282 | ret = pgio->pg_error; |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 283 | } |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 284 | out: |
| 285 | return ret; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 286 | } |
| 287 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 288 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
| 289 | { |
| 290 | struct inode *inode = page->mapping->host; |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 291 | int ret; |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 292 | |
| 293 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
| 294 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); |
| 295 | |
| 296 | nfs_pageio_cond_complete(pgio, page->index); |
Wu Fengguang | 1b430be | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 297 | ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 298 | if (ret == -EAGAIN) { |
| 299 | redirty_page_for_writepage(wbc, page); |
| 300 | ret = 0; |
| 301 | } |
| 302 | return ret; |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 303 | } |
| 304 | |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 305 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | * Write an mmapped page to the server. |
| 307 | */ |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 308 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 310 | struct nfs_pageio_descriptor pgio; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 311 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 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); |
| 316 | if (err < 0) |
| 317 | return err; |
| 318 | if (pgio.pg_error < 0) |
| 319 | return pgio.pg_error; |
| 320 | return 0; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | int nfs_writepage(struct page *page, struct writeback_control *wbc) |
| 324 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 325 | int ret; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 326 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 327 | ret = nfs_writepage_locked(page, wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | unlock_page(page); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 329 | return ret; |
| 330 | } |
| 331 | |
| 332 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) |
| 333 | { |
| 334 | int ret; |
| 335 | |
| 336 | ret = nfs_do_writepage(page, wbc, data); |
| 337 | unlock_page(page); |
| 338 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
| 342 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | struct inode *inode = mapping->host; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 344 | unsigned long *bitlock = &NFS_I(inode)->flags; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 345 | struct nfs_pageio_descriptor pgio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | int err; |
| 347 | |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 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); |
| 351 | if (err) |
| 352 | goto out_err; |
| 353 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 354 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
| 355 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 356 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 357 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 358 | nfs_pageio_complete(&pgio); |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 359 | |
| 360 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); |
| 361 | smp_mb__after_clear_bit(); |
| 362 | wake_up_bit(bitlock, NFS_INO_FLUSHING); |
| 363 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 364 | if (err < 0) |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 365 | goto out_err; |
| 366 | err = pgio.pg_error; |
| 367 | if (err < 0) |
| 368 | goto out_err; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 369 | return 0; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 370 | out_err: |
| 371 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Insert a write request into an inode |
| 376 | */ |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 377 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | { |
| 379 | struct nfs_inode *nfsi = NFS_I(inode); |
| 380 | int error; |
| 381 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 382 | error = radix_tree_preload(GFP_NOFS); |
| 383 | if (error != 0) |
| 384 | goto out; |
| 385 | |
| 386 | /* Lock the request! */ |
| 387 | nfs_lock_request_dontget(req); |
| 388 | |
| 389 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
Nick Piggin | 2785259 | 2008-02-04 23:48:37 -0800 | [diff] [blame] | 391 | BUG_ON(error); |
Trond Myklebust | 4d65c52 | 2011-03-25 14:15:11 -0400 | [diff] [blame] | 392 | if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE)) |
| 393 | nfsi->change_attr++; |
Trond Myklebust | 2df485a | 2010-12-07 22:39:17 -0500 | [diff] [blame] | 394 | set_bit(PG_MAPPED, &req->wb_flags); |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 395 | SetPagePrivate(req->wb_page); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 396 | set_page_private(req->wb_page, (unsigned long)req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | nfsi->npages++; |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 398 | kref_get(&req->wb_kref); |
Nick Piggin | 2785259 | 2008-02-04 23:48:37 -0800 | [diff] [blame] | 399 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
| 400 | NFS_PAGE_TAG_LOCKED); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 401 | spin_unlock(&inode->i_lock); |
| 402 | radix_tree_preload_end(); |
| 403 | out: |
| 404 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 408 | * Remove a write request from an inode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | */ |
| 410 | static void nfs_inode_remove_request(struct nfs_page *req) |
| 411 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 412 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | struct nfs_inode *nfsi = NFS_I(inode); |
| 414 | |
| 415 | BUG_ON (!NFS_WBACK_BUSY(req)); |
| 416 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 417 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 418 | set_page_private(req->wb_page, 0); |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 419 | ClearPagePrivate(req->wb_page); |
Trond Myklebust | 2df485a | 2010-12-07 22:39:17 -0500 | [diff] [blame] | 420 | clear_bit(PG_MAPPED, &req->wb_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
| 422 | nfsi->npages--; |
Trond Myklebust | 4d65c52 | 2011-03-25 14:15:11 -0400 | [diff] [blame] | 423 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | nfs_release_request(req); |
| 425 | } |
| 426 | |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 427 | static void |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 428 | nfs_mark_request_dirty(struct nfs_page *req) |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 429 | { |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 430 | __set_page_dirty_nobuffers(req->wb_page); |
Trond Myklebust | b80c3cb | 2010-04-09 19:07:07 -0400 | [diff] [blame] | 431 | __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC); |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 432 | } |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 435 | /* |
| 436 | * Add a request to the inode's commit list. |
| 437 | */ |
| 438 | static void |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 439 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 441 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | struct nfs_inode *nfsi = NFS_I(inode); |
| 443 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 444 | spin_lock(&inode->i_lock); |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 445 | set_bit(PG_CLEAN, &(req)->wb_flags); |
Trond Myklebust | 5c36968 | 2007-06-17 15:27:42 -0400 | [diff] [blame] | 446 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
| 447 | req->wb_index, |
| 448 | NFS_PAGE_TAG_COMMIT); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 449 | nfsi->ncommit++; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 450 | spin_unlock(&inode->i_lock); |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 451 | pnfs_mark_request_commit(req, lseg); |
Christoph Lameter | fd39fc8 | 2006-06-30 01:55:40 -0700 | [diff] [blame] | 452 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 453 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
Trond Myklebust | a180304 | 2006-12-05 00:45:19 -0500 | [diff] [blame] | 454 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 456 | |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 457 | static int |
| 458 | nfs_clear_request_commit(struct nfs_page *req) |
| 459 | { |
| 460 | struct page *page = req->wb_page; |
| 461 | |
| 462 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { |
| 463 | dec_zone_page_state(page, NR_UNSTABLE_NFS); |
| 464 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
| 465 | return 1; |
| 466 | } |
| 467 | return 0; |
| 468 | } |
| 469 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 470 | static inline |
| 471 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 472 | { |
Fred Isaman | 465d524 | 2011-03-23 13:27:44 +0000 | [diff] [blame] | 473 | if (data->verf.committed == NFS_DATA_SYNC) |
| 474 | return data->lseg == NULL; |
| 475 | else |
| 476 | return data->verf.committed != NFS_FILE_SYNC; |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | static inline |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 480 | int nfs_reschedule_unstable_write(struct nfs_page *req, |
| 481 | struct nfs_write_data *data) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 482 | { |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 483 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 484 | nfs_mark_request_commit(req, data->lseg); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 485 | return 1; |
| 486 | } |
| 487 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 488 | nfs_mark_request_dirty(req); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 489 | return 1; |
| 490 | } |
| 491 | return 0; |
| 492 | } |
| 493 | #else |
| 494 | static inline void |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 495 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 496 | { |
| 497 | } |
| 498 | |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 499 | static inline int |
| 500 | nfs_clear_request_commit(struct nfs_page *req) |
| 501 | { |
| 502 | return 0; |
| 503 | } |
| 504 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 505 | static inline |
| 506 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 507 | { |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | static inline |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 512 | int nfs_reschedule_unstable_write(struct nfs_page *req, |
| 513 | struct nfs_write_data *data) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 514 | { |
| 515 | return 0; |
| 516 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | #endif |
| 518 | |
Trond Myklebust | 47c6256 | 2009-03-16 08:13:41 -0400 | [diff] [blame] | 519 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 520 | static int |
| 521 | nfs_need_commit(struct nfs_inode *nfsi) |
| 522 | { |
| 523 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); |
| 524 | } |
| 525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | /* |
| 527 | * nfs_scan_commit - Scan an inode for commit requests |
| 528 | * @inode: NFS inode to scan |
| 529 | * @dst: destination list |
| 530 | * @idx_start: lower bound of page->index to scan. |
| 531 | * @npages: idx_start + npages sets the upper bound to scan. |
| 532 | * |
| 533 | * Moves requests from the inode's 'commit' request list. |
| 534 | * The requests are *not* checked to ensure that they form a contiguous set. |
| 535 | */ |
| 536 | static int |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 537 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { |
| 539 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 540 | int ret; |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 541 | |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 542 | if (!nfs_need_commit(nfsi)) |
| 543 | return 0; |
| 544 | |
Dave Chinner | 0d88f6e | 2011-04-12 19:18:08 +1000 | [diff] [blame] | 545 | spin_lock(&inode->i_lock); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 546 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
| 547 | if (ret > 0) |
| 548 | nfsi->ncommit -= ret; |
Dave Chinner | 0d88f6e | 2011-04-12 19:18:08 +1000 | [diff] [blame] | 549 | spin_unlock(&inode->i_lock); |
| 550 | |
Trond Myklebust | 2928db1 | 2010-02-19 17:03:18 -0800 | [diff] [blame] | 551 | if (nfs_need_commit(NFS_I(inode))) |
| 552 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Dave Chinner | 0d88f6e | 2011-04-12 19:18:08 +1000 | [diff] [blame] | 553 | |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 554 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 556 | #else |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 557 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
| 558 | { |
| 559 | return 0; |
| 560 | } |
| 561 | |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 562 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 563 | { |
| 564 | return 0; |
| 565 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | #endif |
| 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | /* |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 569 | * Search for an existing write request, and attempt to update |
| 570 | * it to reflect a new dirty region on a given page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | * |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 572 | * If the attempt fails, then the existing request is flushed out |
| 573 | * to disk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | */ |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 575 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
| 576 | struct page *page, |
| 577 | unsigned int offset, |
| 578 | unsigned int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | { |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 580 | struct nfs_page *req; |
| 581 | unsigned int rqend; |
| 582 | unsigned int end; |
| 583 | int error; |
| 584 | |
| 585 | if (!PagePrivate(page)) |
| 586 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | end = offset + bytes; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 589 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | for (;;) { |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 592 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 593 | if (req == NULL) |
| 594 | goto out_unlock; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 595 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 596 | rqend = req->wb_offset + req->wb_bytes; |
| 597 | /* |
| 598 | * Tell the caller to flush out the request if |
| 599 | * the offsets are non-contiguous. |
| 600 | * Note: nfs_flush_incompatible() will already |
| 601 | * have flushed out requests having wrong owners. |
| 602 | */ |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 603 | if (offset > rqend |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 604 | || end < req->wb_offset) |
| 605 | goto out_flushme; |
| 606 | |
| 607 | if (nfs_set_page_tag_locked(req)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 610 | /* The request is locked, so wait and then retry */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 611 | spin_unlock(&inode->i_lock); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 612 | error = nfs_wait_on_request(req); |
| 613 | nfs_release_request(req); |
| 614 | if (error != 0) |
| 615 | goto out_err; |
| 616 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 619 | if (nfs_clear_request_commit(req) && |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 620 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, |
| 621 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) { |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 622 | NFS_I(inode)->ncommit--; |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 623 | pnfs_clear_request_commit(req); |
| 624 | } |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | /* Okay, the request matches. Update the region */ |
| 627 | if (offset < req->wb_offset) { |
| 628 | req->wb_offset = offset; |
| 629 | req->wb_pgbase = offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | if (end > rqend) |
| 632 | req->wb_bytes = end - req->wb_offset; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 633 | else |
| 634 | req->wb_bytes = rqend - req->wb_offset; |
| 635 | out_unlock: |
| 636 | spin_unlock(&inode->i_lock); |
| 637 | return req; |
| 638 | out_flushme: |
| 639 | spin_unlock(&inode->i_lock); |
| 640 | nfs_release_request(req); |
| 641 | error = nfs_wb_page(inode, page); |
| 642 | out_err: |
| 643 | return ERR_PTR(error); |
| 644 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 646 | /* |
| 647 | * Try to update an existing write request, or create one if there is none. |
| 648 | * |
| 649 | * Note: Should always be called with the Page Lock held to prevent races |
| 650 | * if we have to add a new request. Also assumes that the caller has |
| 651 | * already called nfs_flush_incompatible() if necessary. |
| 652 | */ |
| 653 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, |
| 654 | struct page *page, unsigned int offset, unsigned int bytes) |
| 655 | { |
| 656 | struct inode *inode = page->mapping->host; |
| 657 | struct nfs_page *req; |
| 658 | int error; |
| 659 | |
| 660 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
| 661 | if (req != NULL) |
| 662 | goto out; |
| 663 | req = nfs_create_request(ctx, inode, page, offset, bytes); |
| 664 | if (IS_ERR(req)) |
| 665 | goto out; |
| 666 | error = nfs_inode_add_request(inode, req); |
| 667 | if (error != 0) { |
| 668 | nfs_release_request(req); |
| 669 | req = ERR_PTR(error); |
| 670 | } |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 671 | out: |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 672 | return req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 675 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
| 676 | unsigned int offset, unsigned int count) |
| 677 | { |
| 678 | struct nfs_page *req; |
| 679 | |
| 680 | req = nfs_setup_write_request(ctx, page, offset, count); |
| 681 | if (IS_ERR(req)) |
| 682 | return PTR_ERR(req); |
Trond Myklebust | b80c3cb | 2010-04-09 19:07:07 -0400 | [diff] [blame] | 683 | nfs_mark_request_dirty(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 684 | /* Update file length */ |
| 685 | nfs_grow_file(page, offset, count); |
| 686 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 687 | nfs_mark_request_dirty(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 688 | nfs_clear_page_tag_locked(req); |
| 689 | return 0; |
| 690 | } |
| 691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | int nfs_flush_incompatible(struct file *file, struct page *page) |
| 693 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 694 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | struct nfs_page *req; |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 696 | int do_flush, status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | /* |
| 698 | * Look for a request corresponding to this page. If there |
| 699 | * is one, and it belongs to another file, we flush it out |
| 700 | * before we try to copy anything into the page. Do this |
| 701 | * due to the lack of an ACCESS-type call in NFSv2. |
| 702 | * Also do the same if we find a request from an existing |
| 703 | * dropped page. |
| 704 | */ |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 705 | do { |
| 706 | req = nfs_page_find_request(page); |
| 707 | if (req == NULL) |
| 708 | return 0; |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 709 | do_flush = req->wb_page != page || req->wb_context != ctx || |
| 710 | req->wb_lock_context->lockowner != current->files || |
| 711 | req->wb_lock_context->pid != current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | nfs_release_request(req); |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 713 | if (!do_flush) |
| 714 | return 0; |
| 715 | status = nfs_wb_page(page->mapping->host, page); |
| 716 | } while (status == 0); |
| 717 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
| 719 | |
| 720 | /* |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 721 | * If the page cache is marked as unsafe or invalid, then we can't rely on |
| 722 | * the PageUptodate() flag. In this case, we will need to turn off |
| 723 | * write optimisations that depend on the page contents being correct. |
| 724 | */ |
| 725 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) |
| 726 | { |
| 727 | return PageUptodate(page) && |
| 728 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); |
| 729 | } |
| 730 | |
| 731 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | * Update and possibly write a cached page of an NFS file. |
| 733 | * |
| 734 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad |
| 735 | * things with a page scheduled for an RPC call (e.g. invalidate it). |
| 736 | */ |
| 737 | int nfs_updatepage(struct file *file, struct page *page, |
| 738 | unsigned int offset, unsigned int count) |
| 739 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 740 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | struct inode *inode = page->mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | int status = 0; |
| 743 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 744 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
| 745 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 746 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 747 | file->f_path.dentry->d_parent->d_name.name, |
| 748 | file->f_path.dentry->d_name.name, count, |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 749 | (long long)(page_offset(page) + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | /* If we're not using byte range locks, and we know the page |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 752 | * is up to date, it may be more efficient to extend the write |
| 753 | * to cover the entire page in order to avoid fragmentation |
| 754 | * inefficiencies. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | */ |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 756 | if (nfs_write_pageuptodate(page, inode) && |
| 757 | inode->i_flock == NULL && |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 758 | !(file->f_flags & O_DSYNC)) { |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 759 | count = max(count + offset, nfs_page_length(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | } |
| 762 | |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 763 | status = nfs_writepage_setup(ctx, page, offset, count); |
Trond Myklebust | 03fa9e8 | 2008-06-05 16:02:35 -0400 | [diff] [blame] | 764 | if (status < 0) |
| 765 | nfs_set_pageerror(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 767 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | status, (long long)i_size_read(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | return status; |
| 770 | } |
| 771 | |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 772 | static void nfs_writepage_release(struct nfs_page *req, |
| 773 | struct nfs_write_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 775 | struct page *page = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 777 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req, data)) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 778 | nfs_inode_remove_request(req); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 779 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 780 | nfs_end_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 783 | static int flush_task_priority(int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | { |
| 785 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { |
| 786 | case FLUSH_HIGHPRI: |
| 787 | return RPC_PRIORITY_HIGH; |
| 788 | case FLUSH_LOWPRI: |
| 789 | return RPC_PRIORITY_LOW; |
| 790 | } |
| 791 | return RPC_PRIORITY_NORMAL; |
| 792 | } |
| 793 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 794 | int nfs_initiate_write(struct nfs_write_data *data, |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 795 | struct rpc_clnt *clnt, |
| 796 | const struct rpc_call_ops *call_ops, |
| 797 | int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | { |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 799 | struct inode *inode = data->inode; |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 800 | int priority = flush_task_priority(how); |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 801 | struct rpc_task *task; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 802 | struct rpc_message msg = { |
| 803 | .rpc_argp = &data->args, |
| 804 | .rpc_resp = &data->res, |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 805 | .rpc_cred = data->cred, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 806 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 807 | struct rpc_task_setup task_setup_data = { |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 808 | .rpc_client = clnt, |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 809 | .task = &data->task, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 810 | .rpc_message = &msg, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 811 | .callback_ops = call_ops, |
| 812 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 813 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 814 | .flags = RPC_TASK_ASYNC, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 815 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 816 | }; |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 817 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 819 | /* Set up the initial task struct. */ |
| 820 | NFS_PROTO(inode)->write_setup(data, &msg); |
| 821 | |
| 822 | dprintk("NFS: %5u initiated write call " |
| 823 | "(req %s/%lld, %u bytes @ offset %llu)\n", |
| 824 | data->task.tk_pid, |
| 825 | inode->i_sb->s_id, |
| 826 | (long long)NFS_FILEID(inode), |
| 827 | data->args.count, |
| 828 | (unsigned long long)data->args.offset); |
| 829 | |
| 830 | task = rpc_run_task(&task_setup_data); |
| 831 | if (IS_ERR(task)) { |
| 832 | ret = PTR_ERR(task); |
| 833 | goto out; |
| 834 | } |
| 835 | if (how & FLUSH_SYNC) { |
| 836 | ret = rpc_wait_for_completion_task(task); |
| 837 | if (ret == 0) |
| 838 | ret = task->tk_status; |
| 839 | } |
| 840 | rpc_put_task(task); |
| 841 | out: |
| 842 | return ret; |
| 843 | } |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 844 | EXPORT_SYMBOL_GPL(nfs_initiate_write); |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 845 | |
| 846 | /* |
| 847 | * Set up the argument/result storage required for the RPC call. |
| 848 | */ |
| 849 | static int nfs_write_rpcsetup(struct nfs_page *req, |
| 850 | struct nfs_write_data *data, |
| 851 | const struct rpc_call_ops *call_ops, |
| 852 | unsigned int count, unsigned int offset, |
Fred Isaman | 5053aa5 | 2011-03-03 15:13:43 +0000 | [diff] [blame] | 853 | struct pnfs_layout_segment *lseg, |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 854 | int how) |
| 855 | { |
| 856 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
| 857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | /* Set up the RPC argument and reply structs |
| 859 | * NB: take care not to mess about with data->commit et al. */ |
| 860 | |
| 861 | data->req = req; |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 862 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 863 | data->cred = req->wb_context->cred; |
Fred Isaman | 5053aa5 | 2011-03-03 15:13:43 +0000 | [diff] [blame] | 864 | data->lseg = get_lseg(lseg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | |
| 866 | data->args.fh = NFS_FH(inode); |
| 867 | data->args.offset = req_offset(req) + offset; |
| 868 | data->args.pgbase = req->wb_pgbase + offset; |
| 869 | data->args.pages = data->pagevec; |
| 870 | data->args.count = count; |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 871 | data->args.context = get_nfs_open_context(req->wb_context); |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 872 | data->args.lock_context = req->wb_lock_context; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 873 | data->args.stable = NFS_UNSTABLE; |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 874 | if (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 875 | data->args.stable = NFS_DATA_SYNC; |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 876 | if (!nfs_need_commit(NFS_I(inode))) |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 877 | data->args.stable = NFS_FILE_SYNC; |
| 878 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | data->res.fattr = &data->fattr; |
| 881 | data->res.count = count; |
| 882 | data->res.verf = &data->verf; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 883 | nfs_fattr_init(&data->fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | |
Andy Adamson | 0382b74 | 2011-03-03 15:13:45 +0000 | [diff] [blame] | 885 | if (data->lseg && |
| 886 | (pnfs_try_to_write_data(data, call_ops, how) == PNFS_ATTEMPTED)) |
| 887 | return 0; |
| 888 | |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 889 | return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 892 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
| 893 | * call this on each, which will prepare them to be retried on next |
| 894 | * writeback using standard nfs. |
| 895 | */ |
| 896 | static void nfs_redirty_request(struct nfs_page *req) |
| 897 | { |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 898 | struct page *page = req->wb_page; |
| 899 | |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 900 | nfs_mark_request_dirty(req); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 901 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 902 | nfs_end_page_writeback(page); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 903 | } |
| 904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | /* |
| 906 | * Generate multiple small requests to write out a single |
| 907 | * contiguous dirty area on one page. |
| 908 | */ |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 909 | static int nfs_flush_multi(struct nfs_pageio_descriptor *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | { |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 911 | struct nfs_page *req = nfs_list_entry(desc->pg_list.next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | struct page *page = req->wb_page; |
| 913 | struct nfs_write_data *data; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 914 | size_t wsize = NFS_SERVER(desc->pg_inode)->wsize, nbytes; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 915 | unsigned int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | int requests = 0; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 917 | int ret = 0; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 918 | struct pnfs_layout_segment *lseg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | LIST_HEAD(list); |
| 920 | |
| 921 | nfs_list_remove_request(req); |
| 922 | |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 923 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
| 924 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit || |
| 925 | desc->pg_count > wsize)) |
| 926 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; |
| 927 | |
| 928 | |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 929 | nbytes = desc->pg_count; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 930 | do { |
| 931 | size_t len = min(nbytes, wsize); |
| 932 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 933 | data = nfs_writedata_alloc(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | if (!data) |
| 935 | goto out_bad; |
| 936 | list_add(&data->pages, &list); |
| 937 | requests++; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 938 | nbytes -= len; |
| 939 | } while (nbytes != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | atomic_set(&req->wb_complete, requests); |
| 941 | |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 942 | BUG_ON(desc->pg_lseg); |
| 943 | lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | ClearPageError(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | offset = 0; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 946 | nbytes = desc->pg_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | do { |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 948 | int ret2; |
| 949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 951 | list_del_init(&data->pages); |
| 952 | |
| 953 | data->pagevec[0] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 955 | if (nbytes < wsize) |
| 956 | wsize = nbytes; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 957 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 958 | wsize, offset, lseg, desc->pg_ioflags); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 959 | if (ret == 0) |
| 960 | ret = ret2; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 961 | offset += wsize; |
| 962 | nbytes -= wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | } while (nbytes != 0); |
| 964 | |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 965 | put_lseg(lseg); |
Fred Isaman | 36fe432 | 2011-03-03 15:13:49 +0000 | [diff] [blame] | 966 | desc->pg_lseg = NULL; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 967 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
| 969 | out_bad: |
| 970 | while (!list_empty(&list)) { |
| 971 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 972 | list_del(&data->pages); |
Fred Isaman | 0da2a4ac | 2011-01-19 14:18:50 -0500 | [diff] [blame] | 973 | nfs_writedata_free(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | } |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 975 | nfs_redirty_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | return -ENOMEM; |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * Create an RPC task for the given write request and kick it. |
| 981 | * The page must have been locked by the caller. |
| 982 | * |
| 983 | * It may happen that the page we're passed is not marked dirty. |
| 984 | * This is the case if nfs_updatepage detects a conflicting request |
| 985 | * that has been written but not committed. |
| 986 | */ |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 987 | static int nfs_flush_one(struct nfs_pageio_descriptor *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | { |
| 989 | struct nfs_page *req; |
| 990 | struct page **pages; |
| 991 | struct nfs_write_data *data; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 992 | struct list_head *head = &desc->pg_list; |
| 993 | struct pnfs_layout_segment *lseg = desc->pg_lseg; |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 994 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 996 | data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base, |
| 997 | desc->pg_count)); |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 998 | if (!data) { |
| 999 | while (!list_empty(head)) { |
| 1000 | req = nfs_list_entry(head->next); |
| 1001 | nfs_list_remove_request(req); |
| 1002 | nfs_redirty_request(req); |
| 1003 | } |
| 1004 | ret = -ENOMEM; |
| 1005 | goto out; |
| 1006 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | pages = data->pagevec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | while (!list_empty(head)) { |
| 1009 | req = nfs_list_entry(head->next); |
| 1010 | nfs_list_remove_request(req); |
| 1011 | nfs_list_add_request(req, &data->pages); |
| 1012 | ClearPageError(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | *pages++ = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | } |
| 1015 | req = nfs_list_entry(data->pages.next); |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1016 | if ((!lseg) && list_is_singular(&data->pages)) |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 1017 | lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 1019 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
| 1020 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit)) |
| 1021 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; |
| 1022 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | /* Set up the argument struct */ |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 1024 | ret = nfs_write_rpcsetup(req, data, &nfs_write_full_ops, desc->pg_count, 0, lseg, desc->pg_ioflags); |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1025 | out: |
| 1026 | put_lseg(lseg); /* Cleans any gotten in ->pg_test */ |
Fred Isaman | 36fe432 | 2011-03-03 15:13:49 +0000 | [diff] [blame] | 1027 | desc->pg_lseg = NULL; |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1028 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1031 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
| 1032 | struct inode *inode, int ioflags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | { |
Chuck Lever | bf4285e | 2007-12-20 14:54:57 -0500 | [diff] [blame] | 1034 | size_t wsize = NFS_SERVER(inode)->wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1036 | pnfs_pageio_init_write(pgio, inode); |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 1037 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1038 | if (wsize < PAGE_CACHE_SIZE) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1039 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1040 | else |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1041 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | } |
| 1043 | |
| 1044 | /* |
| 1045 | * Handle a write reply that flushed part of a page. |
| 1046 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1047 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1049 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1051 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
| 1052 | task->tk_pid, |
| 1053 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1054 | (long long) |
| 1055 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), |
| 1056 | data->req->wb_bytes, (long long)req_offset(data->req)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1058 | nfs_writeback_done(task, data); |
| 1059 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1060 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1061 | static void nfs_writeback_release_partial(void *calldata) |
| 1062 | { |
| 1063 | struct nfs_write_data *data = calldata; |
| 1064 | struct nfs_page *req = data->req; |
| 1065 | struct page *page = req->wb_page; |
| 1066 | int status = data->task.tk_status; |
| 1067 | |
| 1068 | if (status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 1069 | nfs_set_pageerror(page); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1070 | nfs_context_set_write_error(req->wb_context, status); |
| 1071 | dprintk(", error = %d\n", status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1072 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | } |
| 1074 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1075 | if (nfs_write_need_commit(data)) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1076 | struct inode *inode = page->mapping->host; |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1077 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1078 | spin_lock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1079 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
| 1080 | /* Do nothing we need to resend the writes */ |
| 1081 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
| 1082 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
| 1083 | dprintk(" defer commit\n"); |
| 1084 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { |
| 1085 | set_bit(PG_NEED_RESCHED, &req->wb_flags); |
| 1086 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); |
| 1087 | dprintk(" server reboot detected\n"); |
| 1088 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1089 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1090 | } else |
| 1091 | dprintk(" OK\n"); |
| 1092 | |
| 1093 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | if (atomic_dec_and_test(&req->wb_complete)) |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 1095 | nfs_writepage_release(req, data); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1096 | nfs_writedata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | } |
| 1098 | |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1099 | #if defined(CONFIG_NFS_V4_1) |
| 1100 | void nfs_write_prepare(struct rpc_task *task, void *calldata) |
| 1101 | { |
| 1102 | struct nfs_write_data *data = calldata; |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1103 | |
Trond Myklebust | 035168a | 2010-06-16 09:52:26 -0400 | [diff] [blame] | 1104 | if (nfs4_setup_sequence(NFS_SERVER(data->inode), |
| 1105 | &data->args.seq_args, |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1106 | &data->res.seq_res, 1, task)) |
| 1107 | return; |
| 1108 | rpc_call_start(task); |
| 1109 | } |
| 1110 | #endif /* CONFIG_NFS_V4_1 */ |
| 1111 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1112 | static const struct rpc_call_ops nfs_write_partial_ops = { |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1113 | #if defined(CONFIG_NFS_V4_1) |
| 1114 | .rpc_call_prepare = nfs_write_prepare, |
| 1115 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1116 | .rpc_call_done = nfs_writeback_done_partial, |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1117 | .rpc_release = nfs_writeback_release_partial, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1118 | }; |
| 1119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | /* |
| 1121 | * Handle a write reply that flushes a whole page. |
| 1122 | * |
| 1123 | * FIXME: There is an inherent race with invalidate_inode_pages and |
| 1124 | * writebacks since the page->count is kept > 1 for as long |
| 1125 | * as the page has a write request pending. |
| 1126 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1127 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1129 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1131 | nfs_writeback_done(task, data); |
| 1132 | } |
| 1133 | |
| 1134 | static void nfs_writeback_release_full(void *calldata) |
| 1135 | { |
| 1136 | struct nfs_write_data *data = calldata; |
| 1137 | int status = data->task.tk_status; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | /* Update attributes as result of writeback. */ |
| 1140 | while (!list_empty(&data->pages)) { |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1141 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
| 1142 | struct page *page = req->wb_page; |
| 1143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | nfs_list_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1146 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
| 1147 | data->task.tk_pid, |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1148 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1149 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | req->wb_bytes, |
| 1151 | (long long)req_offset(req)); |
| 1152 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1153 | if (status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 1154 | nfs_set_pageerror(page); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1155 | nfs_context_set_write_error(req->wb_context, status); |
| 1156 | dprintk(", error = %d\n", status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1157 | goto remove_request; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1160 | if (nfs_write_need_commit(data)) { |
| 1161 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 1162 | nfs_mark_request_commit(req, data->lseg); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1163 | dprintk(" marked for commit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | goto next; |
| 1165 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1166 | dprintk(" OK\n"); |
| 1167 | remove_request: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | nfs_inode_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1170 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 1171 | nfs_end_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | } |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1173 | nfs_writedata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | } |
| 1175 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1176 | static const struct rpc_call_ops nfs_write_full_ops = { |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1177 | #if defined(CONFIG_NFS_V4_1) |
| 1178 | .rpc_call_prepare = nfs_write_prepare, |
| 1179 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1180 | .rpc_call_done = nfs_writeback_done_full, |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1181 | .rpc_release = nfs_writeback_release_full, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1182 | }; |
| 1183 | |
| 1184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | /* |
| 1186 | * This function is called when the WRITE call is complete. |
| 1187 | */ |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1188 | void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | struct nfs_writeargs *argp = &data->args; |
| 1191 | struct nfs_writeres *resp = &data->res; |
Andy Adamson | eedc020 | 2009-04-01 09:22:41 -0400 | [diff] [blame] | 1192 | struct nfs_server *server = NFS_SERVER(data->inode); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1193 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1195 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | task->tk_pid, task->tk_status); |
| 1197 | |
Chuck Lever | f551e44 | 2006-09-20 14:33:04 -0400 | [diff] [blame] | 1198 | /* |
| 1199 | * ->write_done will attempt to use post-op attributes to detect |
| 1200 | * conflicting writes by other clients. A strict interpretation |
| 1201 | * of close-to-open would allow us to continue caching even if |
| 1202 | * another writer had changed the file, but some applications |
| 1203 | * depend on tighter cache coherency when writing. |
| 1204 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1205 | status = NFS_PROTO(data->inode)->write_done(task, data); |
| 1206 | if (status != 0) |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1207 | return; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1208 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
| 1209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 1211 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { |
| 1212 | /* We tried a write call, but the server did not |
| 1213 | * commit data to stable storage even though we |
| 1214 | * requested it. |
| 1215 | * Note: There is a known bug in Tru64 < 5.0 in which |
| 1216 | * the server reports NFS_DATA_SYNC, but performs |
| 1217 | * NFS_FILE_SYNC. We therefore implement this checking |
| 1218 | * as a dprintk() in order to avoid filling syslog. |
| 1219 | */ |
| 1220 | static unsigned long complain; |
| 1221 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 1222 | /* Note this will print the MDS for a DS write */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | if (time_before(complain, jiffies)) { |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1224 | dprintk("NFS: faulty NFS server %s:" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | " (committed = %d) != (stable = %d)\n", |
Andy Adamson | eedc020 | 2009-04-01 09:22:41 -0400 | [diff] [blame] | 1226 | server->nfs_client->cl_hostname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | resp->verf->committed, argp->stable); |
| 1228 | complain = jiffies + 300 * HZ; |
| 1229 | } |
| 1230 | } |
| 1231 | #endif |
| 1232 | /* Is this a short write? */ |
| 1233 | if (task->tk_status >= 0 && resp->count < argp->count) { |
| 1234 | static unsigned long complain; |
| 1235 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1236 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
| 1237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | /* Has the server at least made some progress? */ |
| 1239 | if (resp->count != 0) { |
| 1240 | /* Was this an NFSv2 write or an NFSv3 stable write? */ |
| 1241 | if (resp->verf->committed != NFS_UNSTABLE) { |
| 1242 | /* Resend from where the server left off */ |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 1243 | data->mds_offset += resp->count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | argp->offset += resp->count; |
| 1245 | argp->pgbase += resp->count; |
| 1246 | argp->count -= resp->count; |
| 1247 | } else { |
| 1248 | /* Resend as a stable write in order to avoid |
| 1249 | * headaches in the case of a server crash. |
| 1250 | */ |
| 1251 | argp->stable = NFS_FILE_SYNC; |
| 1252 | } |
Trond Myklebust | 0110ee1 | 2009-12-07 09:00:24 -0500 | [diff] [blame] | 1253 | nfs_restart_rpc(task, server->nfs_client); |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1254 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | } |
| 1256 | if (time_before(complain, jiffies)) { |
| 1257 | printk(KERN_WARNING |
| 1258 | "NFS: Server wrote zero bytes, expected %u.\n", |
| 1259 | argp->count); |
| 1260 | complain = jiffies + 300 * HZ; |
| 1261 | } |
| 1262 | /* Can't do anything about it except throw an error. */ |
| 1263 | task->tk_status = -EIO; |
| 1264 | } |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1265 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | } |
| 1267 | |
| 1268 | |
| 1269 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1270 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
| 1271 | { |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1272 | int ret; |
| 1273 | |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1274 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
| 1275 | return 1; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1276 | if (!may_wait) |
| 1277 | return 0; |
| 1278 | ret = out_of_line_wait_on_bit_lock(&nfsi->flags, |
| 1279 | NFS_INO_COMMIT, |
| 1280 | nfs_wait_bit_killable, |
| 1281 | TASK_KILLABLE); |
| 1282 | return (ret < 0) ? ret : 1; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1283 | } |
| 1284 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1285 | void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1286 | { |
| 1287 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); |
| 1288 | smp_mb__after_clear_bit(); |
| 1289 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); |
| 1290 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1291 | EXPORT_SYMBOL_GPL(nfs_commit_clear_lock); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1292 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1293 | void nfs_commitdata_release(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | { |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 1295 | struct nfs_write_data *wdata = data; |
| 1296 | |
Fred Isaman | 988b6dc | 2011-03-23 13:27:52 +0000 | [diff] [blame] | 1297 | put_lseg(wdata->lseg); |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 1298 | put_nfs_open_context(wdata->args.context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | nfs_commit_free(wdata); |
| 1300 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1301 | EXPORT_SYMBOL_GPL(nfs_commitdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1303 | int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1304 | const struct rpc_call_ops *call_ops, |
| 1305 | int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1307 | struct rpc_task *task; |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1308 | int priority = flush_task_priority(how); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1309 | struct rpc_message msg = { |
| 1310 | .rpc_argp = &data->args, |
| 1311 | .rpc_resp = &data->res, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1312 | .rpc_cred = data->cred, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1313 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1314 | struct rpc_task_setup task_setup_data = { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1315 | .task = &data->task, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1316 | .rpc_client = clnt, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1317 | .rpc_message = &msg, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1318 | .callback_ops = call_ops, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1319 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 1320 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 1321 | .flags = RPC_TASK_ASYNC, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1322 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1323 | }; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1324 | /* Set up the initial task struct. */ |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1325 | NFS_PROTO(data->inode)->commit_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1327 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1328 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1329 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1330 | if (IS_ERR(task)) |
| 1331 | return PTR_ERR(task); |
Jeff Layton | d2224e7 | 2011-03-06 17:14:13 +0000 | [diff] [blame] | 1332 | if (how & FLUSH_SYNC) |
| 1333 | rpc_wait_for_completion_task(task); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1334 | rpc_put_task(task); |
| 1335 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1337 | EXPORT_SYMBOL_GPL(nfs_initiate_commit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | |
| 1339 | /* |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1340 | * Set up the argument/result storage required for the RPC call. |
| 1341 | */ |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1342 | void nfs_init_commit(struct nfs_write_data *data, |
Fred Isaman | 988b6dc | 2011-03-23 13:27:52 +0000 | [diff] [blame] | 1343 | struct list_head *head, |
| 1344 | struct pnfs_layout_segment *lseg) |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1345 | { |
| 1346 | struct nfs_page *first = nfs_list_entry(head->next); |
| 1347 | struct inode *inode = first->wb_context->path.dentry->d_inode; |
| 1348 | |
| 1349 | /* Set up the RPC argument and reply structs |
| 1350 | * NB: take care not to mess about with data->commit et al. */ |
| 1351 | |
| 1352 | list_splice_init(head, &data->pages); |
| 1353 | |
| 1354 | data->inode = inode; |
| 1355 | data->cred = first->wb_context->cred; |
Fred Isaman | 988b6dc | 2011-03-23 13:27:52 +0000 | [diff] [blame] | 1356 | data->lseg = lseg; /* reference transferred */ |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1357 | data->mds_ops = &nfs_commit_ops; |
| 1358 | |
| 1359 | data->args.fh = NFS_FH(data->inode); |
| 1360 | /* Note: we always request a commit of the entire inode */ |
| 1361 | data->args.offset = 0; |
| 1362 | data->args.count = 0; |
| 1363 | data->args.context = get_nfs_open_context(first->wb_context); |
| 1364 | data->res.count = 0; |
| 1365 | data->res.fattr = &data->fattr; |
| 1366 | data->res.verf = &data->verf; |
| 1367 | nfs_fattr_init(&data->fattr); |
| 1368 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1369 | EXPORT_SYMBOL_GPL(nfs_init_commit); |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1370 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1371 | void nfs_retry_commit(struct list_head *page_list, |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 1372 | struct pnfs_layout_segment *lseg) |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1373 | { |
| 1374 | struct nfs_page *req; |
| 1375 | |
| 1376 | while (!list_empty(page_list)) { |
| 1377 | req = nfs_list_entry(page_list->next); |
| 1378 | nfs_list_remove_request(req); |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 1379 | nfs_mark_request_commit(req, lseg); |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1380 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
| 1381 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
| 1382 | BDI_RECLAIMABLE); |
| 1383 | nfs_clear_page_tag_locked(req); |
| 1384 | } |
| 1385 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1386 | EXPORT_SYMBOL_GPL(nfs_retry_commit); |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1387 | |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1388 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | * Commit dirty pages |
| 1390 | */ |
| 1391 | static int |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 1392 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | { |
| 1394 | struct nfs_write_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1396 | data = nfs_commitdata_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | |
| 1398 | if (!data) |
| 1399 | goto out_bad; |
| 1400 | |
| 1401 | /* Set up the argument struct */ |
Fred Isaman | 988b6dc | 2011-03-23 13:27:52 +0000 | [diff] [blame] | 1402 | nfs_init_commit(data, head, NULL); |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1403 | return nfs_initiate_commit(data, NFS_CLIENT(inode), data->mds_ops, how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | out_bad: |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 1405 | nfs_retry_commit(head, NULL); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1406 | nfs_commit_clear_lock(NFS_I(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | return -ENOMEM; |
| 1408 | } |
| 1409 | |
| 1410 | /* |
| 1411 | * COMMIT call returned |
| 1412 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1413 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 1415 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1417 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | task->tk_pid, task->tk_status); |
| 1419 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1420 | /* Call the NFS version-specific code */ |
| 1421 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) |
| 1422 | return; |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1423 | } |
| 1424 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1425 | void nfs_commit_release_pages(struct nfs_write_data *data) |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1426 | { |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1427 | struct nfs_page *req; |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1428 | int status = data->task.tk_status; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | while (!list_empty(&data->pages)) { |
| 1431 | req = nfs_list_entry(data->pages.next); |
| 1432 | nfs_list_remove_request(req); |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 1433 | nfs_clear_request_commit(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1435 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1436 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1437 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | req->wb_bytes, |
| 1439 | (long long)req_offset(req)); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1440 | if (status < 0) { |
| 1441 | nfs_context_set_write_error(req->wb_context, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | nfs_inode_remove_request(req); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1443 | dprintk(", error = %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | goto next; |
| 1445 | } |
| 1446 | |
| 1447 | /* Okay, COMMIT succeeded, apparently. Check the verifier |
| 1448 | * returned by the server against all stored verfs. */ |
| 1449 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { |
| 1450 | /* We have a match */ |
| 1451 | nfs_inode_remove_request(req); |
| 1452 | dprintk(" OK\n"); |
| 1453 | goto next; |
| 1454 | } |
| 1455 | /* We have a mismatch. Write the page again */ |
| 1456 | dprintk(" mismatch\n"); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 1457 | nfs_mark_request_dirty(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1459 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | } |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1461 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1462 | EXPORT_SYMBOL_GPL(nfs_commit_release_pages); |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1463 | |
| 1464 | static void nfs_commit_release(void *calldata) |
| 1465 | { |
| 1466 | struct nfs_write_data *data = calldata; |
| 1467 | |
| 1468 | nfs_commit_release_pages(data); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1469 | nfs_commit_clear_lock(NFS_I(data->inode)); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1470 | nfs_commitdata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1472 | |
| 1473 | static const struct rpc_call_ops nfs_commit_ops = { |
Andy Adamson | 21d9a85 | 2009-04-01 09:22:27 -0400 | [diff] [blame] | 1474 | #if defined(CONFIG_NFS_V4_1) |
| 1475 | .rpc_call_prepare = nfs_write_prepare, |
| 1476 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1477 | .rpc_call_done = nfs_commit_done, |
| 1478 | .rpc_release = nfs_commit_release, |
| 1479 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 1481 | int nfs_commit_inode(struct inode *inode, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | LIST_HEAD(head); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1484 | int may_wait = how & FLUSH_SYNC; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1485 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1487 | res = nfs_commit_set_lock(NFS_I(inode), may_wait); |
| 1488 | if (res <= 0) |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1489 | goto out_mark_dirty; |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1490 | res = nfs_scan_commit(inode, &head, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | if (res) { |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 1492 | int error; |
| 1493 | |
| 1494 | error = pnfs_commit_list(inode, &head, how); |
| 1495 | if (error == PNFS_NOT_ATTEMPTED) |
| 1496 | error = nfs_commit_list(inode, &head, how); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1497 | if (error < 0) |
| 1498 | return error; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1499 | if (!may_wait) |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1500 | goto out_mark_dirty; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1501 | error = wait_on_bit(&NFS_I(inode)->flags, |
| 1502 | NFS_INO_COMMIT, |
| 1503 | nfs_wait_bit_killable, |
| 1504 | TASK_KILLABLE); |
| 1505 | if (error < 0) |
| 1506 | return error; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1507 | } else |
| 1508 | nfs_commit_clear_lock(NFS_I(inode)); |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1509 | return res; |
| 1510 | /* Note: If we exit without ensuring that the commit is complete, |
| 1511 | * we must mark the inode as dirty. Otherwise, future calls to |
| 1512 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure |
| 1513 | * that the data is on the disk. |
| 1514 | */ |
| 1515 | out_mark_dirty: |
| 1516 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | return res; |
| 1518 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1519 | |
| 1520 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1521 | { |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1522 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1523 | int flags = FLUSH_SYNC; |
| 1524 | int ret = 0; |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1525 | |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1526 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 1527 | /* Don't commit yet if this is a non-blocking flush and there |
| 1528 | * are a lot of outstanding writes for this mapping. |
| 1529 | */ |
| 1530 | if (nfsi->ncommit <= (nfsi->npages >> 1)) |
| 1531 | goto out_mark_dirty; |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1532 | |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1533 | /* don't wait for the COMMIT response */ |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1534 | flags = 0; |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1535 | } |
| 1536 | |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1537 | ret = nfs_commit_inode(inode, flags); |
| 1538 | if (ret >= 0) { |
| 1539 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 1540 | if (ret < wbc->nr_to_write) |
| 1541 | wbc->nr_to_write -= ret; |
| 1542 | else |
| 1543 | wbc->nr_to_write = 0; |
| 1544 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1545 | return 0; |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1546 | } |
| 1547 | out_mark_dirty: |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1548 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
| 1549 | return ret; |
| 1550 | } |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1551 | #else |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1552 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1553 | { |
| 1554 | return 0; |
| 1555 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | #endif |
| 1557 | |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1558 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 1559 | { |
Andy Adamson | 863a3c6 | 2011-03-23 13:27:54 +0000 | [diff] [blame] | 1560 | int ret; |
| 1561 | |
| 1562 | ret = nfs_commit_unstable_pages(inode, wbc); |
| 1563 | if (ret >= 0 && test_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags)) { |
Andy Adamson | ef31153 | 2011-03-12 02:58:10 -0500 | [diff] [blame] | 1564 | int status; |
| 1565 | bool sync = true; |
Andy Adamson | 863a3c6 | 2011-03-23 13:27:54 +0000 | [diff] [blame] | 1566 | |
Andy Adamson | ef31153 | 2011-03-12 02:58:10 -0500 | [diff] [blame] | 1567 | if (wbc->sync_mode == WB_SYNC_NONE || wbc->nonblocking || |
| 1568 | wbc->for_background) |
| 1569 | sync = false; |
Andy Adamson | 863a3c6 | 2011-03-23 13:27:54 +0000 | [diff] [blame] | 1570 | |
| 1571 | status = pnfs_layoutcommit_inode(inode, sync); |
| 1572 | if (status < 0) |
| 1573 | return status; |
| 1574 | } |
| 1575 | return ret; |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1576 | } |
| 1577 | |
Trond Myklebust | acdc53b | 2010-02-19 17:03:26 -0800 | [diff] [blame] | 1578 | /* |
| 1579 | * flush the inode to disk. |
| 1580 | */ |
| 1581 | int nfs_wb_all(struct inode *inode) |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1582 | { |
| 1583 | struct writeback_control wbc = { |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 1584 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1585 | .nr_to_write = LONG_MAX, |
Trond Myklebust | d7fb120 | 2008-10-06 20:08:56 -0400 | [diff] [blame] | 1586 | .range_start = 0, |
| 1587 | .range_end = LLONG_MAX, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1588 | }; |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1589 | |
Trond Myklebust | acdc53b | 2010-02-19 17:03:26 -0800 | [diff] [blame] | 1590 | return sync_inode(inode, &wbc); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1591 | } |
| 1592 | |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1593 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
| 1594 | { |
| 1595 | struct nfs_page *req; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1596 | int ret = 0; |
| 1597 | |
| 1598 | BUG_ON(!PageLocked(page)); |
| 1599 | for (;;) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1600 | wait_on_page_writeback(page); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1601 | req = nfs_page_find_request(page); |
| 1602 | if (req == NULL) |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1603 | break; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1604 | if (nfs_lock_request_dontget(req)) { |
| 1605 | nfs_inode_remove_request(req); |
| 1606 | /* |
| 1607 | * In case nfs_inode_remove_request has marked the |
| 1608 | * page as being dirty |
| 1609 | */ |
| 1610 | cancel_dirty_page(page, PAGE_CACHE_SIZE); |
| 1611 | nfs_unlock_request(req); |
| 1612 | break; |
| 1613 | } |
| 1614 | ret = nfs_wait_on_request(req); |
Trond Myklebust | c9edda7 | 2010-01-26 15:41:34 -0500 | [diff] [blame] | 1615 | nfs_release_request(req); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1616 | if (ret < 0) |
Trond Myklebust | c988950 | 2010-02-19 17:03:21 -0800 | [diff] [blame] | 1617 | break; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1618 | } |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1619 | return ret; |
| 1620 | } |
| 1621 | |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1622 | /* |
| 1623 | * Write back all requests on one page - we do this before reading it. |
| 1624 | */ |
| 1625 | int nfs_wb_page(struct inode *inode, struct page *page) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1626 | { |
| 1627 | loff_t range_start = page_offset(page); |
| 1628 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1629 | struct writeback_control wbc = { |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1630 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1631 | .nr_to_write = 0, |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1632 | .range_start = range_start, |
| 1633 | .range_end = range_end, |
| 1634 | }; |
| 1635 | int ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1636 | |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1637 | for (;;) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1638 | wait_on_page_writeback(page); |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1639 | if (clear_page_dirty_for_io(page)) { |
| 1640 | ret = nfs_writepage_locked(page, &wbc); |
| 1641 | if (ret < 0) |
| 1642 | goto out_error; |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1643 | continue; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1644 | } |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1645 | if (!PagePrivate(page)) |
| 1646 | break; |
| 1647 | ret = nfs_commit_inode(inode, FLUSH_SYNC); |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1648 | if (ret < 0) |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1649 | goto out_error; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1650 | } |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1651 | return 0; |
| 1652 | out_error: |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1653 | return ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1654 | } |
| 1655 | |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1656 | #ifdef CONFIG_MIGRATION |
| 1657 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, |
| 1658 | struct page *page) |
| 1659 | { |
| 1660 | struct nfs_page *req; |
| 1661 | int ret; |
| 1662 | |
Trond Myklebust | 7549ad5 | 2010-02-08 09:32:34 -0500 | [diff] [blame] | 1663 | nfs_fscache_release_page(page, GFP_KERNEL); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1664 | |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 1665 | req = nfs_find_and_lock_request(page, false); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1666 | ret = PTR_ERR(req); |
| 1667 | if (IS_ERR(req)) |
| 1668 | goto out; |
| 1669 | |
| 1670 | ret = migrate_page(mapping, newpage, page); |
| 1671 | if (!req) |
| 1672 | goto out; |
| 1673 | if (ret) |
| 1674 | goto out_unlock; |
| 1675 | page_cache_get(newpage); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1676 | spin_lock(&mapping->host->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1677 | req->wb_page = newpage; |
| 1678 | SetPagePrivate(newpage); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1679 | set_page_private(newpage, (unsigned long)req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1680 | ClearPagePrivate(page); |
| 1681 | set_page_private(page, 0); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1682 | spin_unlock(&mapping->host->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1683 | page_cache_release(page); |
| 1684 | out_unlock: |
| 1685 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1686 | out: |
| 1687 | return ret; |
| 1688 | } |
| 1689 | #endif |
| 1690 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 1691 | int __init nfs_init_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | { |
| 1693 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", |
| 1694 | sizeof(struct nfs_write_data), |
| 1695 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1696 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | if (nfs_wdata_cachep == NULL) |
| 1698 | return -ENOMEM; |
| 1699 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1700 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
| 1701 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | if (nfs_wdata_mempool == NULL) |
| 1703 | return -ENOMEM; |
| 1704 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1705 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
| 1706 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | if (nfs_commit_mempool == NULL) |
| 1708 | return -ENOMEM; |
| 1709 | |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 1710 | /* |
| 1711 | * NFS congestion size, scale with available memory. |
| 1712 | * |
| 1713 | * 64MB: 8192k |
| 1714 | * 128MB: 11585k |
| 1715 | * 256MB: 16384k |
| 1716 | * 512MB: 23170k |
| 1717 | * 1GB: 32768k |
| 1718 | * 2GB: 46340k |
| 1719 | * 4GB: 65536k |
| 1720 | * 8GB: 92681k |
| 1721 | * 16GB: 131072k |
| 1722 | * |
| 1723 | * This allows larger machines to have larger/more transfers. |
| 1724 | * Limit the default to 256M |
| 1725 | */ |
| 1726 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); |
| 1727 | if (nfs_congestion_kb > 256*1024) |
| 1728 | nfs_congestion_kb = 256*1024; |
| 1729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | return 0; |
| 1731 | } |
| 1732 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 1733 | void nfs_destroy_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | { |
| 1735 | mempool_destroy(nfs_commit_mempool); |
| 1736 | mempool_destroy(nfs_wdata_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1737 | kmem_cache_destroy(nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | } |
| 1739 | |