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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | #include <linux/sunrpc/clnt.h> |
| 18 | #include <linux/nfs_fs.h> |
| 19 | #include <linux/nfs_mount.h> |
| 20 | #include <linux/nfs_page.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 21 | #include <linux/backing-dev.h> |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include "delegation.h" |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 26 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 27 | #include "iostat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
| 30 | |
| 31 | #define MIN_POOL_WRITE (32) |
| 32 | #define MIN_POOL_COMMIT (4) |
| 33 | |
| 34 | /* |
| 35 | * Local function declarations |
| 36 | */ |
| 37 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | struct page *, |
| 39 | unsigned int, unsigned int); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 40 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
| 41 | struct inode *inode, int ioflags); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 42 | static const struct rpc_call_ops nfs_write_partial_ops; |
| 43 | static const struct rpc_call_ops nfs_write_full_ops; |
| 44 | static const struct rpc_call_ops nfs_commit_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 46 | static struct kmem_cache *nfs_wdata_cachep; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 47 | static mempool_t *nfs_wdata_mempool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | static mempool_t *nfs_commit_mempool; |
| 49 | |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 50 | struct nfs_write_data *nfs_commit_alloc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 52 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | if (p) { |
| 55 | memset(p, 0, sizeof(*p)); |
| 56 | INIT_LIST_HEAD(&p->pages); |
| 57 | } |
| 58 | return p; |
| 59 | } |
| 60 | |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 61 | static void nfs_commit_rcu_free(struct rcu_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 63 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 64 | if (p && (p->pagevec != &p->page_array[0])) |
| 65 | kfree(p->pagevec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | mempool_free(p, nfs_commit_mempool); |
| 67 | } |
| 68 | |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 69 | void nfs_commit_free(struct nfs_write_data *wdata) |
| 70 | { |
| 71 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); |
| 72 | } |
| 73 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 74 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 75 | { |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 76 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 77 | |
| 78 | if (p) { |
| 79 | memset(p, 0, sizeof(*p)); |
| 80 | INIT_LIST_HEAD(&p->pages); |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 81 | p->npages = pagecount; |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 82 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
| 83 | p->pagevec = p->page_array; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 84 | else { |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 85 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
| 86 | if (!p->pagevec) { |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 87 | mempool_free(p, nfs_wdata_mempool); |
| 88 | p = NULL; |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | return p; |
| 93 | } |
| 94 | |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 95 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 96 | { |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 97 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 98 | if (p && (p->pagevec != &p->page_array[0])) |
| 99 | kfree(p->pagevec); |
| 100 | mempool_free(p, nfs_wdata_mempool); |
| 101 | } |
| 102 | |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 103 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
| 104 | { |
| 105 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); |
| 106 | } |
| 107 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 108 | void nfs_writedata_release(void *wdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | nfs_writedata_free(wdata); |
| 111 | } |
| 112 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 113 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
| 114 | { |
| 115 | ctx->error = error; |
| 116 | smp_wmb(); |
| 117 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 118 | } |
| 119 | |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 120 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
| 121 | { |
| 122 | struct nfs_page *req = NULL; |
| 123 | |
| 124 | if (PagePrivate(page)) { |
| 125 | req = (struct nfs_page *)page_private(page); |
| 126 | if (req != NULL) |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 127 | kref_get(&req->wb_kref); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 128 | } |
| 129 | return req; |
| 130 | } |
| 131 | |
| 132 | static struct nfs_page *nfs_page_find_request(struct page *page) |
| 133 | { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 134 | struct inode *inode = page->mapping->host; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 135 | struct nfs_page *req = NULL; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 136 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 137 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 138 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 139 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 140 | return req; |
| 141 | } |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* Adjust the file length if we're writing beyond the end */ |
| 144 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) |
| 145 | { |
| 146 | struct inode *inode = page->mapping->host; |
| 147 | loff_t end, i_size = i_size_read(inode); |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 148 | pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | if (i_size > 0 && page->index < end_index) |
| 151 | return; |
| 152 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
| 153 | if (i_size >= end) |
| 154 | return; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 155 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | i_size_write(inode, end); |
| 157 | } |
| 158 | |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 159 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
| 160 | static void nfs_set_pageerror(struct page *page) |
| 161 | { |
| 162 | SetPageError(page); |
| 163 | nfs_zap_mapping(page->mapping->host, page->mapping); |
| 164 | } |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /* We can set the PG_uptodate flag if we see that a write request |
| 167 | * covers the full page. |
| 168 | */ |
| 169 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) |
| 170 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | if (PageUptodate(page)) |
| 172 | return; |
| 173 | if (base != 0) |
| 174 | return; |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 175 | if (count != nfs_page_length(page)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | return; |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 177 | SetPageUptodate(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 180 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | unsigned int offset, unsigned int count) |
| 182 | { |
| 183 | struct nfs_page *req; |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 184 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 186 | for (;;) { |
| 187 | req = nfs_update_request(ctx, page, offset, count); |
| 188 | if (!IS_ERR(req)) |
| 189 | break; |
| 190 | ret = PTR_ERR(req); |
| 191 | if (ret != -EBUSY) |
| 192 | return ret; |
| 193 | ret = nfs_wb_page(page->mapping->host, page); |
| 194 | if (ret != 0) |
| 195 | return ret; |
| 196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /* Update file length */ |
| 198 | nfs_grow_file(page, offset, count); |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 199 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | abd3e64 | 2006-01-03 09:55:02 +0100 | [diff] [blame] | 200 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
| 203 | static int wb_priority(struct writeback_control *wbc) |
| 204 | { |
| 205 | if (wbc->for_reclaim) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 206 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | if (wbc->for_kupdate) |
| 208 | return FLUSH_LOWPRI; |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 213 | * NFS congestion control |
| 214 | */ |
| 215 | |
| 216 | int nfs_congestion_kb; |
| 217 | |
| 218 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) |
| 219 | #define NFS_CONGESTION_OFF_THRESH \ |
| 220 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) |
| 221 | |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 222 | static int nfs_set_page_writeback(struct page *page) |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 223 | { |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 224 | int ret = test_set_page_writeback(page); |
| 225 | |
| 226 | if (!ret) { |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 227 | struct inode *inode = page->mapping->host; |
| 228 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 229 | |
Peter Zijlstra | 277866a | 2007-05-08 00:35:12 -0700 | [diff] [blame] | 230 | if (atomic_long_inc_return(&nfss->writeback) > |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 231 | NFS_CONGESTION_ON_THRESH) |
| 232 | set_bdi_congested(&nfss->backing_dev_info, WRITE); |
| 233 | } |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 234 | return ret; |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | static void nfs_end_page_writeback(struct page *page) |
| 238 | { |
| 239 | struct inode *inode = page->mapping->host; |
| 240 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 241 | |
| 242 | end_page_writeback(page); |
Peter Zijlstra | c4dc4be | 2007-10-16 23:25:41 -0700 | [diff] [blame] | 243 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 244 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | /* |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 248 | * Find an associated nfs write request, and prepare to flush it out |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 249 | * May return an error if the user signalled nfs_wait_on_request(). |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 250 | */ |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 251 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
| 252 | struct page *page) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 253 | { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 254 | struct inode *inode = page->mapping->host; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 255 | struct nfs_page *req; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 256 | int ret; |
| 257 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 258 | spin_lock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 259 | for(;;) { |
| 260 | req = nfs_page_find_request_locked(page); |
| 261 | if (req == NULL) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 262 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 263 | return 0; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 264 | } |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 265 | if (nfs_set_page_tag_locked(req)) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 266 | break; |
| 267 | /* 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] | 268 | * then the call to nfs_set_page_tag_locked() will always |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 269 | * succeed provided that someone hasn't already marked the |
| 270 | * request as dirty (in which case we don't care). |
| 271 | */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 272 | spin_unlock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 273 | ret = nfs_wait_on_request(req); |
| 274 | nfs_release_request(req); |
| 275 | if (ret != 0) |
| 276 | return ret; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 277 | spin_lock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 278 | } |
Trond Myklebust | 612c938 | 2007-04-20 16:12:45 -0400 | [diff] [blame] | 279 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
| 280 | /* This request is marked for commit */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 281 | spin_unlock(&inode->i_lock); |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 282 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 283 | nfs_pageio_complete(pgio); |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 284 | return 0; |
Trond Myklebust | 612c938 | 2007-04-20 16:12:45 -0400 | [diff] [blame] | 285 | } |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 286 | if (nfs_set_page_writeback(page) != 0) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 287 | spin_unlock(&inode->i_lock); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 288 | BUG(); |
| 289 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 290 | spin_unlock(&inode->i_lock); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 291 | nfs_pageio_add_request(pgio, req); |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 292 | return 0; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 293 | } |
| 294 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 295 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
| 296 | { |
| 297 | struct inode *inode = page->mapping->host; |
| 298 | |
| 299 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
| 300 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); |
| 301 | |
| 302 | nfs_pageio_cond_complete(pgio, page->index); |
| 303 | return nfs_page_async_flush(pgio, page); |
| 304 | } |
| 305 | |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 306 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | * Write an mmapped page to the server. |
| 308 | */ |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 309 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 311 | struct nfs_pageio_descriptor pgio; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 312 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 314 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
| 315 | err = nfs_do_writepage(page, wbc, &pgio); |
| 316 | nfs_pageio_complete(&pgio); |
| 317 | if (err < 0) |
| 318 | return err; |
| 319 | if (pgio.pg_error < 0) |
| 320 | return pgio.pg_error; |
| 321 | return 0; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | int nfs_writepage(struct page *page, struct writeback_control *wbc) |
| 325 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 326 | int ret; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 327 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 328 | ret = nfs_writepage_locked(page, wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | unlock_page(page); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 330 | return ret; |
| 331 | } |
| 332 | |
| 333 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) |
| 334 | { |
| 335 | int ret; |
| 336 | |
| 337 | ret = nfs_do_writepage(page, wbc, data); |
| 338 | unlock_page(page); |
| 339 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
| 343 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | struct inode *inode = mapping->host; |
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 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 348 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
| 349 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 350 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 351 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 352 | nfs_pageio_complete(&pgio); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 353 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | return err; |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 355 | if (pgio.pg_error < 0) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 356 | return pgio.pg_error; |
| 357 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | /* |
| 361 | * Insert a write request into an inode |
| 362 | */ |
| 363 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
| 364 | { |
| 365 | struct nfs_inode *nfsi = NFS_I(inode); |
| 366 | int error; |
| 367 | |
| 368 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
| 369 | BUG_ON(error == -EEXIST); |
| 370 | if (error) |
| 371 | return error; |
| 372 | if (!nfsi->npages) { |
| 373 | igrab(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
| 375 | nfsi->change_attr++; |
| 376 | } |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 377 | SetPagePrivate(req->wb_page); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 378 | set_page_private(req->wb_page, (unsigned long)req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | nfsi->npages++; |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 380 | kref_get(&req->wb_kref); |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 381 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, NFS_PAGE_TAG_LOCKED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | return 0; |
| 383 | } |
| 384 | |
| 385 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 386 | * Remove a write request from an inode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | */ |
| 388 | static void nfs_inode_remove_request(struct nfs_page *req) |
| 389 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 390 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | struct nfs_inode *nfsi = NFS_I(inode); |
| 392 | |
| 393 | BUG_ON (!NFS_WBACK_BUSY(req)); |
| 394 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 395 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 396 | set_page_private(req->wb_page, 0); |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 397 | ClearPagePrivate(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
| 399 | nfsi->npages--; |
| 400 | if (!nfsi->npages) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 401 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | iput(inode); |
| 403 | } else |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 404 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | nfs_clear_request(req); |
| 406 | nfs_release_request(req); |
| 407 | } |
| 408 | |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 409 | static void |
| 410 | nfs_redirty_request(struct nfs_page *req) |
| 411 | { |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 412 | __set_page_dirty_nobuffers(req->wb_page); |
| 413 | } |
| 414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | /* |
| 416 | * Check if a request is dirty |
| 417 | */ |
| 418 | static inline int |
| 419 | nfs_dirty_request(struct nfs_page *req) |
| 420 | { |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 421 | struct page *page = req->wb_page; |
| 422 | |
Trond Myklebust | 612c938 | 2007-04-20 16:12:45 -0400 | [diff] [blame] | 423 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 424 | return 0; |
| 425 | return !PageWriteback(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 429 | /* |
| 430 | * Add a request to the inode's commit list. |
| 431 | */ |
| 432 | static void |
| 433 | nfs_mark_request_commit(struct nfs_page *req) |
| 434 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 435 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | struct nfs_inode *nfsi = NFS_I(inode); |
| 437 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 438 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | nfsi->ncommit++; |
Trond Myklebust | 612c938 | 2007-04-20 16:12:45 -0400 | [diff] [blame] | 440 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
Trond Myklebust | 5c36968 | 2007-06-17 15:27:42 -0400 | [diff] [blame] | 441 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
| 442 | req->wb_index, |
| 443 | NFS_PAGE_TAG_COMMIT); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 444 | spin_unlock(&inode->i_lock); |
Christoph Lameter | fd39fc8 | 2006-06-30 01:55:40 -0700 | [diff] [blame] | 445 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 446 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
Trond Myklebust | a180304 | 2006-12-05 00:45:19 -0500 | [diff] [blame] | 447 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 449 | |
| 450 | static inline |
| 451 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 452 | { |
| 453 | return data->verf.committed != NFS_FILE_SYNC; |
| 454 | } |
| 455 | |
| 456 | static inline |
| 457 | int nfs_reschedule_unstable_write(struct nfs_page *req) |
| 458 | { |
Trond Myklebust | 612c938 | 2007-04-20 16:12:45 -0400 | [diff] [blame] | 459 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 460 | nfs_mark_request_commit(req); |
| 461 | return 1; |
| 462 | } |
| 463 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
| 464 | nfs_redirty_request(req); |
| 465 | return 1; |
| 466 | } |
| 467 | return 0; |
| 468 | } |
| 469 | #else |
| 470 | static inline void |
| 471 | nfs_mark_request_commit(struct nfs_page *req) |
| 472 | { |
| 473 | } |
| 474 | |
| 475 | static inline |
| 476 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 477 | { |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static inline |
| 482 | int nfs_reschedule_unstable_write(struct nfs_page *req) |
| 483 | { |
| 484 | return 0; |
| 485 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | #endif |
| 487 | |
| 488 | /* |
| 489 | * Wait for a request to complete. |
| 490 | * |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 491 | * Interruptible by fatal signals only. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | */ |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 493 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | { |
| 495 | struct nfs_inode *nfsi = NFS_I(inode); |
| 496 | struct nfs_page *req; |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 497 | pgoff_t idx_end, next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | unsigned int res = 0; |
| 499 | int error; |
| 500 | |
| 501 | if (npages == 0) |
| 502 | idx_end = ~0; |
| 503 | else |
| 504 | idx_end = idx_start + npages - 1; |
| 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | next = idx_start; |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 507 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | if (req->wb_index > idx_end) |
| 509 | break; |
| 510 | |
| 511 | next = req->wb_index + 1; |
Trond Myklebust | c6a556b | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 512 | BUG_ON(!NFS_WBACK_BUSY(req)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 514 | kref_get(&req->wb_kref); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 515 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | error = nfs_wait_on_request(req); |
| 517 | nfs_release_request(req); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 518 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | if (error < 0) |
| 520 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | res++; |
| 522 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | return res; |
| 524 | } |
| 525 | |
Trond Myklebust | 83715ad | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 526 | static void nfs_cancel_commit_list(struct list_head *head) |
| 527 | { |
| 528 | struct nfs_page *req; |
| 529 | |
| 530 | while(!list_empty(head)) { |
| 531 | req = nfs_list_entry(head->next); |
Trond Myklebust | b6dff26 | 2006-10-19 23:28:38 -0700 | [diff] [blame] | 532 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 533 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
| 534 | BDI_RECLAIMABLE); |
Trond Myklebust | 83715ad | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 535 | nfs_list_remove_request(req); |
Trond Myklebust | 612c938 | 2007-04-20 16:12:45 -0400 | [diff] [blame] | 536 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
Trond Myklebust | 83715ad | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 537 | nfs_inode_remove_request(req); |
Trond Myklebust | b6dff26 | 2006-10-19 23:28:38 -0700 | [diff] [blame] | 538 | nfs_unlock_request(req); |
Trond Myklebust | 83715ad | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 539 | } |
| 540 | } |
| 541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 543 | /* |
| 544 | * nfs_scan_commit - Scan an inode for commit requests |
| 545 | * @inode: NFS inode to scan |
| 546 | * @dst: destination list |
| 547 | * @idx_start: lower bound of page->index to scan. |
| 548 | * @npages: idx_start + npages sets the upper bound to scan. |
| 549 | * |
| 550 | * Moves requests from the inode's 'commit' request list. |
| 551 | * The requests are *not* checked to ensure that they form a contiguous set. |
| 552 | */ |
| 553 | static int |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 554 | 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] | 555 | { |
| 556 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 557 | int res = 0; |
| 558 | |
| 559 | if (nfsi->ncommit != 0) { |
Trond Myklebust | 5c36968 | 2007-06-17 15:27:42 -0400 | [diff] [blame] | 560 | res = nfs_scan_list(nfsi, dst, idx_start, npages, |
| 561 | NFS_PAGE_TAG_COMMIT); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 562 | nfsi->ncommit -= res; |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 563 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | return res; |
| 565 | } |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 566 | #else |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 567 | 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] | 568 | { |
| 569 | return 0; |
| 570 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | #endif |
| 572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | /* |
| 574 | * Try to update any existing write request, or create one if there is none. |
| 575 | * In order to match, the request's credentials must match those of |
| 576 | * the calling process. |
| 577 | * |
| 578 | * Note: Should always be called with the Page Lock held! |
| 579 | */ |
| 580 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 581 | struct page *page, unsigned int offset, unsigned int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | { |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 583 | struct address_space *mapping = page->mapping; |
| 584 | struct inode *inode = mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | struct nfs_page *req, *new = NULL; |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 586 | pgoff_t rqend, end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | end = offset + bytes; |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | for (;;) { |
| 591 | /* Loop over all inode entries and see if we find |
| 592 | * A request for the page we wish to update |
| 593 | */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 594 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 595 | req = nfs_page_find_request_locked(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | if (req) { |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 597 | if (!nfs_set_page_tag_locked(req)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | int error; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 599 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 600 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | error = nfs_wait_on_request(req); |
| 602 | nfs_release_request(req); |
Neil Brown | 1dd594b | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 603 | if (error < 0) { |
| 604 | if (new) |
| 605 | nfs_release_request(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return ERR_PTR(error); |
Neil Brown | 1dd594b | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 607 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | continue; |
| 609 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 610 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if (new) |
| 612 | nfs_release_request(new); |
| 613 | break; |
| 614 | } |
| 615 | |
| 616 | if (new) { |
| 617 | int error; |
| 618 | nfs_lock_request_dontget(new); |
| 619 | error = nfs_inode_add_request(inode, new); |
| 620 | if (error) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 621 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | nfs_unlock_request(new); |
| 623 | return ERR_PTR(error); |
| 624 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 625 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 626 | req = new; |
| 627 | goto zero_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 629 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
| 631 | new = nfs_create_request(ctx, inode, page, offset, bytes); |
| 632 | if (IS_ERR(new)) |
| 633 | return new; |
| 634 | } |
| 635 | |
| 636 | /* We have a request for our page. |
| 637 | * If the creds don't match, or the |
| 638 | * page addresses don't match, |
| 639 | * tell the caller to wait on the conflicting |
| 640 | * request. |
| 641 | */ |
| 642 | rqend = req->wb_offset + req->wb_bytes; |
| 643 | if (req->wb_context != ctx |
| 644 | || req->wb_page != page |
| 645 | || !nfs_dirty_request(req) |
| 646 | || offset > rqend || end < req->wb_offset) { |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 647 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | return ERR_PTR(-EBUSY); |
| 649 | } |
| 650 | |
| 651 | /* Okay, the request matches. Update the region */ |
| 652 | if (offset < req->wb_offset) { |
| 653 | req->wb_offset = offset; |
| 654 | req->wb_pgbase = offset; |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 655 | req->wb_bytes = max(end, rqend) - req->wb_offset; |
| 656 | goto zero_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | if (end > rqend) |
| 660 | req->wb_bytes = end - req->wb_offset; |
| 661 | |
| 662 | return req; |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 663 | zero_page: |
| 664 | /* If this page might potentially be marked as up to date, |
| 665 | * then we need to zero any uninitalised data. */ |
| 666 | if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE |
| 667 | && !PageUptodate(req->wb_page)) |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 668 | zero_user_segment(req->wb_page, req->wb_bytes, PAGE_CACHE_SIZE); |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 669 | return req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | int nfs_flush_incompatible(struct file *file, struct page *page) |
| 673 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 674 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | struct nfs_page *req; |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 676 | int do_flush, status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | /* |
| 678 | * Look for a request corresponding to this page. If there |
| 679 | * is one, and it belongs to another file, we flush it out |
| 680 | * before we try to copy anything into the page. Do this |
| 681 | * due to the lack of an ACCESS-type call in NFSv2. |
| 682 | * Also do the same if we find a request from an existing |
| 683 | * dropped page. |
| 684 | */ |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 685 | do { |
| 686 | req = nfs_page_find_request(page); |
| 687 | if (req == NULL) |
| 688 | return 0; |
| 689 | do_flush = req->wb_page != page || req->wb_context != ctx |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 690 | || !nfs_dirty_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | nfs_release_request(req); |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 692 | if (!do_flush) |
| 693 | return 0; |
| 694 | status = nfs_wb_page(page->mapping->host, page); |
| 695 | } while (status == 0); |
| 696 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
| 698 | |
| 699 | /* |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 700 | * If the page cache is marked as unsafe or invalid, then we can't rely on |
| 701 | * the PageUptodate() flag. In this case, we will need to turn off |
| 702 | * write optimisations that depend on the page contents being correct. |
| 703 | */ |
| 704 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) |
| 705 | { |
| 706 | return PageUptodate(page) && |
| 707 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); |
| 708 | } |
| 709 | |
| 710 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | * Update and possibly write a cached page of an NFS file. |
| 712 | * |
| 713 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad |
| 714 | * things with a page scheduled for an RPC call (e.g. invalidate it). |
| 715 | */ |
| 716 | int nfs_updatepage(struct file *file, struct page *page, |
| 717 | unsigned int offset, unsigned int count) |
| 718 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 719 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | struct inode *inode = page->mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | int status = 0; |
| 722 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 723 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
| 724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 726 | file->f_path.dentry->d_parent->d_name.name, |
| 727 | file->f_path.dentry->d_name.name, count, |
Chuck Lever | 0bbacc4 | 2005-11-01 16:53:32 -0500 | [diff] [blame] | 728 | (long long)(page_offset(page) +offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | /* 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] | 731 | * is up to date, it may be more efficient to extend the write |
| 732 | * to cover the entire page in order to avoid fragmentation |
| 733 | * inefficiencies. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | */ |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 735 | if (nfs_write_pageuptodate(page, inode) && |
| 736 | inode->i_flock == NULL && |
| 737 | !(file->f_mode & O_SYNC)) { |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 738 | count = max(count + offset, nfs_page_length(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
| 741 | |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 742 | status = nfs_writepage_setup(ctx, page, offset, count); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 743 | __set_page_dirty_nobuffers(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
| 746 | status, (long long)i_size_read(inode)); |
| 747 | if (status < 0) |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 748 | nfs_set_pageerror(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | return status; |
| 750 | } |
| 751 | |
| 752 | static void nfs_writepage_release(struct nfs_page *req) |
| 753 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Trond Myklebust | 44dd151 | 2007-05-19 11:58:03 -0400 | [diff] [blame] | 755 | if (PageError(req->wb_page)) { |
| 756 | nfs_end_page_writeback(req->wb_page); |
| 757 | nfs_inode_remove_request(req); |
| 758 | } else if (!nfs_reschedule_unstable_write(req)) { |
| 759 | /* Set the PG_uptodate flag */ |
| 760 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 761 | nfs_end_page_writeback(req->wb_page); |
| 762 | nfs_inode_remove_request(req); |
| 763 | } else |
| 764 | nfs_end_page_writeback(req->wb_page); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 765 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
| 767 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 768 | static int flush_task_priority(int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | { |
| 770 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { |
| 771 | case FLUSH_HIGHPRI: |
| 772 | return RPC_PRIORITY_HIGH; |
| 773 | case FLUSH_LOWPRI: |
| 774 | return RPC_PRIORITY_LOW; |
| 775 | } |
| 776 | return RPC_PRIORITY_NORMAL; |
| 777 | } |
| 778 | |
| 779 | /* |
| 780 | * Set up the argument/result storage required for the RPC call. |
| 781 | */ |
| 782 | static void nfs_write_rpcsetup(struct nfs_page *req, |
| 783 | struct nfs_write_data *data, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 784 | const struct rpc_call_ops *call_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | unsigned int count, unsigned int offset, |
| 786 | int how) |
| 787 | { |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 788 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
| 789 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 790 | int priority = flush_task_priority(how); |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 791 | struct rpc_task *task; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 792 | struct rpc_message msg = { |
| 793 | .rpc_argp = &data->args, |
| 794 | .rpc_resp = &data->res, |
| 795 | .rpc_cred = req->wb_context->cred, |
| 796 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 797 | struct rpc_task_setup task_setup_data = { |
| 798 | .rpc_client = NFS_CLIENT(inode), |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 799 | .task = &data->task, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 800 | .rpc_message = &msg, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 801 | .callback_ops = call_ops, |
| 802 | .callback_data = data, |
| 803 | .flags = flags, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 804 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 805 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
| 807 | /* Set up the RPC argument and reply structs |
| 808 | * NB: take care not to mess about with data->commit et al. */ |
| 809 | |
| 810 | data->req = req; |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 811 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 812 | data->cred = msg.rpc_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | data->args.fh = NFS_FH(inode); |
| 815 | data->args.offset = req_offset(req) + offset; |
| 816 | data->args.pgbase = req->wb_pgbase + offset; |
| 817 | data->args.pages = data->pagevec; |
| 818 | data->args.count = count; |
| 819 | data->args.context = req->wb_context; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 820 | data->args.stable = NFS_UNSTABLE; |
| 821 | if (how & FLUSH_STABLE) { |
| 822 | data->args.stable = NFS_DATA_SYNC; |
| 823 | if (!NFS_I(inode)->ncommit) |
| 824 | data->args.stable = NFS_FILE_SYNC; |
| 825 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
| 827 | data->res.fattr = &data->fattr; |
| 828 | data->res.count = count; |
| 829 | data->res.verf = &data->verf; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 830 | nfs_fattr_init(&data->fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 832 | /* Set up the initial task struct. */ |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 833 | NFS_PROTO(inode)->write_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 835 | dprintk("NFS: %5u initiated write call " |
| 836 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", |
Chuck Lever | 0bbacc4 | 2005-11-01 16:53:32 -0500 | [diff] [blame] | 837 | data->task.tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | inode->i_sb->s_id, |
| 839 | (long long)NFS_FILEID(inode), |
| 840 | count, |
| 841 | (unsigned long long)data->args.offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 843 | task = rpc_run_task(&task_setup_data); |
| 844 | if (!IS_ERR(task)) |
| 845 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | /* |
| 849 | * Generate multiple small requests to write out a single |
| 850 | * contiguous dirty area on one page. |
| 851 | */ |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 852 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | { |
| 854 | struct nfs_page *req = nfs_list_entry(head->next); |
| 855 | struct page *page = req->wb_page; |
| 856 | struct nfs_write_data *data; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 857 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
| 858 | unsigned int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | int requests = 0; |
| 860 | LIST_HEAD(list); |
| 861 | |
| 862 | nfs_list_remove_request(req); |
| 863 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 864 | nbytes = count; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 865 | do { |
| 866 | size_t len = min(nbytes, wsize); |
| 867 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 868 | data = nfs_writedata_alloc(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | if (!data) |
| 870 | goto out_bad; |
| 871 | list_add(&data->pages, &list); |
| 872 | requests++; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 873 | nbytes -= len; |
| 874 | } while (nbytes != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | atomic_set(&req->wb_complete, requests); |
| 876 | |
| 877 | ClearPageError(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | offset = 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 879 | nbytes = count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | do { |
| 881 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 882 | list_del_init(&data->pages); |
| 883 | |
| 884 | data->pagevec[0] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 886 | if (nbytes < wsize) |
| 887 | wsize = nbytes; |
| 888 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
| 889 | wsize, offset, how); |
| 890 | offset += wsize; |
| 891 | nbytes -= wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | } while (nbytes != 0); |
| 893 | |
| 894 | return 0; |
| 895 | |
| 896 | out_bad: |
| 897 | while (!list_empty(&list)) { |
| 898 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 899 | list_del(&data->pages); |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 900 | nfs_writedata_release(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | } |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 902 | nfs_redirty_request(req); |
Trond Myklebust | 6d677e3 | 2007-04-20 16:12:40 -0400 | [diff] [blame] | 903 | nfs_end_page_writeback(req->wb_page); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 904 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | return -ENOMEM; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Create an RPC task for the given write request and kick it. |
| 910 | * The page must have been locked by the caller. |
| 911 | * |
| 912 | * It may happen that the page we're passed is not marked dirty. |
| 913 | * This is the case if nfs_updatepage detects a conflicting request |
| 914 | * that has been written but not committed. |
| 915 | */ |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 916 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | { |
| 918 | struct nfs_page *req; |
| 919 | struct page **pages; |
| 920 | struct nfs_write_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 922 | data = nfs_writedata_alloc(npages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | if (!data) |
| 924 | goto out_bad; |
| 925 | |
| 926 | pages = data->pagevec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | while (!list_empty(head)) { |
| 928 | req = nfs_list_entry(head->next); |
| 929 | nfs_list_remove_request(req); |
| 930 | nfs_list_add_request(req, &data->pages); |
| 931 | ClearPageError(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | *pages++ = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } |
| 934 | req = nfs_list_entry(data->pages.next); |
| 935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | /* Set up the argument struct */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 937 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | return 0; |
| 940 | out_bad: |
| 941 | while (!list_empty(head)) { |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 942 | req = nfs_list_entry(head->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | nfs_list_remove_request(req); |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 944 | nfs_redirty_request(req); |
Trond Myklebust | 6d677e3 | 2007-04-20 16:12:40 -0400 | [diff] [blame] | 945 | nfs_end_page_writeback(req->wb_page); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 946 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |
| 948 | return -ENOMEM; |
| 949 | } |
| 950 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 951 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
| 952 | struct inode *inode, int ioflags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | { |
Chuck Lever | bf4285e | 2007-12-20 14:54:57 -0500 | [diff] [blame] | 954 | size_t wsize = NFS_SERVER(inode)->wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 956 | if (wsize < PAGE_CACHE_SIZE) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 957 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 958 | else |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 959 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
| 961 | |
| 962 | /* |
| 963 | * Handle a write reply that flushed part of a page. |
| 964 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 965 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 967 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | struct nfs_page *req = data->req; |
| 969 | struct page *page = req->wb_page; |
| 970 | |
| 971 | dprintk("NFS: write (%s/%Ld %d@%Ld)", |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 972 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 973 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | req->wb_bytes, |
| 975 | (long long)req_offset(req)); |
| 976 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 977 | if (nfs_writeback_done(task, data) != 0) |
| 978 | return; |
| 979 | |
| 980 | if (task->tk_status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 981 | nfs_set_pageerror(page); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 982 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 983 | dprintk(", error = %d\n", task->tk_status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 984 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } |
| 986 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 987 | if (nfs_write_need_commit(data)) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 988 | struct inode *inode = page->mapping->host; |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 989 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 990 | spin_lock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 991 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
| 992 | /* Do nothing we need to resend the writes */ |
| 993 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
| 994 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
| 995 | dprintk(" defer commit\n"); |
| 996 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { |
| 997 | set_bit(PG_NEED_RESCHED, &req->wb_flags); |
| 998 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); |
| 999 | dprintk(" server reboot detected\n"); |
| 1000 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1001 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1002 | } else |
| 1003 | dprintk(" OK\n"); |
| 1004 | |
| 1005 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | if (atomic_dec_and_test(&req->wb_complete)) |
| 1007 | nfs_writepage_release(req); |
| 1008 | } |
| 1009 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1010 | static const struct rpc_call_ops nfs_write_partial_ops = { |
| 1011 | .rpc_call_done = nfs_writeback_done_partial, |
| 1012 | .rpc_release = nfs_writedata_release, |
| 1013 | }; |
| 1014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | /* |
| 1016 | * Handle a write reply that flushes a whole page. |
| 1017 | * |
| 1018 | * FIXME: There is an inherent race with invalidate_inode_pages and |
| 1019 | * writebacks since the page->count is kept > 1 for as long |
| 1020 | * as the page has a write request pending. |
| 1021 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1022 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1024 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | struct nfs_page *req; |
| 1026 | struct page *page; |
| 1027 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1028 | if (nfs_writeback_done(task, data) != 0) |
| 1029 | return; |
| 1030 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | /* Update attributes as result of writeback. */ |
| 1032 | while (!list_empty(&data->pages)) { |
| 1033 | req = nfs_list_entry(data->pages.next); |
| 1034 | nfs_list_remove_request(req); |
| 1035 | page = req->wb_page; |
| 1036 | |
| 1037 | dprintk("NFS: write (%s/%Ld %d@%Ld)", |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1038 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1039 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | req->wb_bytes, |
| 1041 | (long long)req_offset(req)); |
| 1042 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1043 | if (task->tk_status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 1044 | nfs_set_pageerror(page); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1045 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1046 | dprintk(", error = %d\n", task->tk_status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1047 | goto remove_request; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1050 | if (nfs_write_need_commit(data)) { |
| 1051 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
| 1052 | nfs_mark_request_commit(req); |
| 1053 | nfs_end_page_writeback(page); |
| 1054 | dprintk(" marked for commit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | goto next; |
| 1056 | } |
Trond Myklebust | 44dd151 | 2007-05-19 11:58:03 -0400 | [diff] [blame] | 1057 | /* Set the PG_uptodate flag? */ |
| 1058 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1059 | dprintk(" OK\n"); |
| 1060 | remove_request: |
| 1061 | nfs_end_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | nfs_inode_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1064 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } |
| 1066 | } |
| 1067 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1068 | static const struct rpc_call_ops nfs_write_full_ops = { |
| 1069 | .rpc_call_done = nfs_writeback_done_full, |
| 1070 | .rpc_release = nfs_writedata_release, |
| 1071 | }; |
| 1072 | |
| 1073 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | /* |
| 1075 | * This function is called when the WRITE call is complete. |
| 1076 | */ |
Chuck Lever | 462d5b3 | 2006-03-20 13:44:32 -0500 | [diff] [blame] | 1077 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | struct nfs_writeargs *argp = &data->args; |
| 1080 | struct nfs_writeres *resp = &data->res; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1081 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1083 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | task->tk_pid, task->tk_status); |
| 1085 | |
Chuck Lever | f551e44 | 2006-09-20 14:33:04 -0400 | [diff] [blame] | 1086 | /* |
| 1087 | * ->write_done will attempt to use post-op attributes to detect |
| 1088 | * conflicting writes by other clients. A strict interpretation |
| 1089 | * of close-to-open would allow us to continue caching even if |
| 1090 | * another writer had changed the file, but some applications |
| 1091 | * depend on tighter cache coherency when writing. |
| 1092 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1093 | status = NFS_PROTO(data->inode)->write_done(task, data); |
| 1094 | if (status != 0) |
| 1095 | return status; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1096 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
| 1097 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 1099 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { |
| 1100 | /* We tried a write call, but the server did not |
| 1101 | * commit data to stable storage even though we |
| 1102 | * requested it. |
| 1103 | * Note: There is a known bug in Tru64 < 5.0 in which |
| 1104 | * the server reports NFS_DATA_SYNC, but performs |
| 1105 | * NFS_FILE_SYNC. We therefore implement this checking |
| 1106 | * as a dprintk() in order to avoid filling syslog. |
| 1107 | */ |
| 1108 | static unsigned long complain; |
| 1109 | |
| 1110 | if (time_before(complain, jiffies)) { |
| 1111 | dprintk("NFS: faulty NFS server %s:" |
| 1112 | " (committed = %d) != (stable = %d)\n", |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 1113 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | resp->verf->committed, argp->stable); |
| 1115 | complain = jiffies + 300 * HZ; |
| 1116 | } |
| 1117 | } |
| 1118 | #endif |
| 1119 | /* Is this a short write? */ |
| 1120 | if (task->tk_status >= 0 && resp->count < argp->count) { |
| 1121 | static unsigned long complain; |
| 1122 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1123 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
| 1124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | /* Has the server at least made some progress? */ |
| 1126 | if (resp->count != 0) { |
| 1127 | /* Was this an NFSv2 write or an NFSv3 stable write? */ |
| 1128 | if (resp->verf->committed != NFS_UNSTABLE) { |
| 1129 | /* Resend from where the server left off */ |
| 1130 | argp->offset += resp->count; |
| 1131 | argp->pgbase += resp->count; |
| 1132 | argp->count -= resp->count; |
| 1133 | } else { |
| 1134 | /* Resend as a stable write in order to avoid |
| 1135 | * headaches in the case of a server crash. |
| 1136 | */ |
| 1137 | argp->stable = NFS_FILE_SYNC; |
| 1138 | } |
| 1139 | rpc_restart_call(task); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1140 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | } |
| 1142 | if (time_before(complain, jiffies)) { |
| 1143 | printk(KERN_WARNING |
| 1144 | "NFS: Server wrote zero bytes, expected %u.\n", |
| 1145 | argp->count); |
| 1146 | complain = jiffies + 300 * HZ; |
| 1147 | } |
| 1148 | /* Can't do anything about it except throw an error. */ |
| 1149 | task->tk_status = -EIO; |
| 1150 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1151 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | } |
| 1153 | |
| 1154 | |
| 1155 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 1156 | void nfs_commit_release(void *wdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | nfs_commit_free(wdata); |
| 1159 | } |
| 1160 | |
| 1161 | /* |
| 1162 | * Set up the argument/result storage required for the RPC call. |
| 1163 | */ |
| 1164 | static void nfs_commit_rpcsetup(struct list_head *head, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1165 | struct nfs_write_data *data, |
| 1166 | int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | { |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1168 | struct nfs_page *first = nfs_list_entry(head->next); |
| 1169 | struct inode *inode = first->wb_context->path.dentry->d_inode; |
| 1170 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1171 | int priority = flush_task_priority(how); |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1172 | struct rpc_task *task; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1173 | struct rpc_message msg = { |
| 1174 | .rpc_argp = &data->args, |
| 1175 | .rpc_resp = &data->res, |
| 1176 | .rpc_cred = first->wb_context->cred, |
| 1177 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1178 | struct rpc_task_setup task_setup_data = { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1179 | .task = &data->task, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1180 | .rpc_client = NFS_CLIENT(inode), |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1181 | .rpc_message = &msg, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1182 | .callback_ops = &nfs_commit_ops, |
| 1183 | .callback_data = data, |
| 1184 | .flags = flags, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1185 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1186 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
| 1188 | /* Set up the RPC argument and reply structs |
| 1189 | * NB: take care not to mess about with data->commit et al. */ |
| 1190 | |
| 1191 | list_splice_init(head, &data->pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | data->inode = inode; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1194 | data->cred = msg.rpc_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | |
| 1196 | data->args.fh = NFS_FH(data->inode); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1197 | /* Note: we always request a commit of the entire inode */ |
| 1198 | data->args.offset = 0; |
| 1199 | data->args.count = 0; |
| 1200 | data->res.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | data->res.fattr = &data->fattr; |
| 1202 | data->res.verf = &data->verf; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 1203 | nfs_fattr_init(&data->fattr); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1204 | |
| 1205 | /* Set up the initial task struct. */ |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1206 | NFS_PROTO(inode)->commit_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1208 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1209 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1210 | task = rpc_run_task(&task_setup_data); |
| 1211 | if (!IS_ERR(task)) |
| 1212 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | /* |
| 1216 | * Commit dirty pages |
| 1217 | */ |
| 1218 | static int |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 1219 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | { |
| 1221 | struct nfs_write_data *data; |
| 1222 | struct nfs_page *req; |
| 1223 | |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 1224 | data = nfs_commit_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | |
| 1226 | if (!data) |
| 1227 | goto out_bad; |
| 1228 | |
| 1229 | /* Set up the argument struct */ |
| 1230 | nfs_commit_rpcsetup(head, data, how); |
| 1231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | return 0; |
| 1233 | out_bad: |
| 1234 | while (!list_empty(head)) { |
| 1235 | req = nfs_list_entry(head->next); |
| 1236 | nfs_list_remove_request(req); |
| 1237 | nfs_mark_request_commit(req); |
Trond Myklebust | 83715ad | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 1238 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 1239 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
| 1240 | BDI_RECLAIMABLE); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1241 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | } |
| 1243 | return -ENOMEM; |
| 1244 | } |
| 1245 | |
| 1246 | /* |
| 1247 | * COMMIT call returned |
| 1248 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1249 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 1251 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | struct nfs_page *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1254 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | task->tk_pid, task->tk_status); |
| 1256 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1257 | /* Call the NFS version-specific code */ |
| 1258 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) |
| 1259 | return; |
| 1260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | while (!list_empty(&data->pages)) { |
| 1262 | req = nfs_list_entry(data->pages.next); |
| 1263 | nfs_list_remove_request(req); |
Trond Myklebust | 612c938 | 2007-04-20 16:12:45 -0400 | [diff] [blame] | 1264 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
Christoph Lameter | fd39fc8 | 2006-06-30 01:55:40 -0700 | [diff] [blame] | 1265 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 1266 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
| 1267 | BDI_RECLAIMABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
| 1269 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1270 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1271 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | req->wb_bytes, |
| 1273 | (long long)req_offset(req)); |
| 1274 | if (task->tk_status < 0) { |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1275 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | nfs_inode_remove_request(req); |
| 1277 | dprintk(", error = %d\n", task->tk_status); |
| 1278 | goto next; |
| 1279 | } |
| 1280 | |
| 1281 | /* Okay, COMMIT succeeded, apparently. Check the verifier |
| 1282 | * returned by the server against all stored verfs. */ |
| 1283 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { |
| 1284 | /* We have a match */ |
Trond Myklebust | 44dd151 | 2007-05-19 11:58:03 -0400 | [diff] [blame] | 1285 | /* Set the PG_uptodate flag */ |
| 1286 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, |
| 1287 | req->wb_bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | nfs_inode_remove_request(req); |
| 1289 | dprintk(" OK\n"); |
| 1290 | goto next; |
| 1291 | } |
| 1292 | /* We have a mismatch. Write the page again */ |
| 1293 | dprintk(" mismatch\n"); |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 1294 | nfs_redirty_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1296 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1299 | |
| 1300 | static const struct rpc_call_ops nfs_commit_ops = { |
| 1301 | .rpc_call_done = nfs_commit_done, |
| 1302 | .rpc_release = nfs_commit_release, |
| 1303 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1305 | int nfs_commit_inode(struct inode *inode, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | LIST_HEAD(head); |
Trond Myklebust | 7d46a49 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 1308 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1310 | spin_lock(&inode->i_lock); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1311 | res = nfs_scan_commit(inode, &head, 0, 0); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1312 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | if (res) { |
Trond Myklebust | 7d46a49 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 1314 | int error = nfs_commit_list(inode, &head, how); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1315 | if (error < 0) |
| 1316 | return error; |
| 1317 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | return res; |
| 1319 | } |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1320 | #else |
| 1321 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
| 1322 | { |
| 1323 | return 0; |
| 1324 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | #endif |
| 1326 | |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1327 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | { |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1329 | struct inode *inode = mapping->host; |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 1330 | pgoff_t idx_start, idx_end; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1331 | unsigned int npages = 0; |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1332 | LIST_HEAD(head); |
Trond Myklebust | 70b9ecb | 2006-01-03 09:55:34 +0100 | [diff] [blame] | 1333 | int nocommit = how & FLUSH_NOCOMMIT; |
Trond Myklebust | 3f44254 | 2006-09-17 14:46:44 -0400 | [diff] [blame] | 1334 | long pages, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1336 | /* FIXME */ |
| 1337 | if (wbc->range_cyclic) |
| 1338 | idx_start = 0; |
| 1339 | else { |
| 1340 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 1341 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 1342 | if (idx_end > idx_start) { |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 1343 | pgoff_t l_npages = 1 + idx_end - idx_start; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1344 | npages = l_npages; |
| 1345 | if (sizeof(npages) != sizeof(l_npages) && |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 1346 | (pgoff_t)npages != l_npages) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1347 | npages = 0; |
| 1348 | } |
| 1349 | } |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1350 | how &= ~FLUSH_NOCOMMIT; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1351 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | do { |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1353 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
| 1354 | if (ret != 0) |
Trond Myklebust | 70b9ecb | 2006-01-03 09:55:34 +0100 | [diff] [blame] | 1355 | continue; |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1356 | if (nocommit) |
| 1357 | break; |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 1358 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
Trond Myklebust | 724c439 | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 1359 | if (pages == 0) |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1360 | break; |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 1361 | if (how & FLUSH_INVALIDATE) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1362 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 83715ad | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 1363 | nfs_cancel_commit_list(&head); |
Trond Myklebust | e8e058e | 2006-11-15 17:31:56 -0500 | [diff] [blame] | 1364 | ret = pages; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1365 | spin_lock(&inode->i_lock); |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 1366 | continue; |
| 1367 | } |
| 1368 | pages += nfs_scan_commit(inode, &head, 0, 0); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1369 | spin_unlock(&inode->i_lock); |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1370 | ret = nfs_commit_list(inode, &head, how); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1371 | spin_lock(&inode->i_lock); |
| 1372 | |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1373 | } while (ret >= 0); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1374 | spin_unlock(&inode->i_lock); |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 1375 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | } |
| 1377 | |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1378 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1379 | { |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1380 | int ret; |
| 1381 | |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1382 | ret = nfs_writepages(mapping, wbc); |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 1383 | if (ret < 0) |
| 1384 | goto out; |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1385 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
Trond Myklebust | ed90ef5 | 2007-07-20 13:13:28 -0400 | [diff] [blame] | 1386 | if (ret < 0) |
| 1387 | goto out; |
| 1388 | return 0; |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 1389 | out: |
Trond Myklebust | e507d9e | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 1390 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1391 | return ret; |
| 1392 | } |
| 1393 | |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1394 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
| 1395 | static int nfs_write_mapping(struct address_space *mapping, int how) |
| 1396 | { |
| 1397 | struct writeback_control wbc = { |
| 1398 | .bdi = mapping->backing_dev_info, |
| 1399 | .sync_mode = WB_SYNC_NONE, |
| 1400 | .nr_to_write = LONG_MAX, |
| 1401 | .for_writepages = 1, |
| 1402 | .range_cyclic = 1, |
| 1403 | }; |
| 1404 | int ret; |
| 1405 | |
| 1406 | ret = __nfs_write_mapping(mapping, &wbc, how); |
| 1407 | if (ret < 0) |
| 1408 | return ret; |
| 1409 | wbc.sync_mode = WB_SYNC_ALL; |
| 1410 | return __nfs_write_mapping(mapping, &wbc, how); |
| 1411 | } |
| 1412 | |
Trond Myklebust | ed90ef5 | 2007-07-20 13:13:28 -0400 | [diff] [blame] | 1413 | /* |
| 1414 | * flush the inode to disk. |
| 1415 | */ |
| 1416 | int nfs_wb_all(struct inode *inode) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1417 | { |
Trond Myklebust | ed90ef5 | 2007-07-20 13:13:28 -0400 | [diff] [blame] | 1418 | return nfs_write_mapping(inode->i_mapping, 0); |
| 1419 | } |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1420 | |
Trond Myklebust | ed90ef5 | 2007-07-20 13:13:28 -0400 | [diff] [blame] | 1421 | int nfs_wb_nocommit(struct inode *inode) |
| 1422 | { |
| 1423 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1424 | } |
| 1425 | |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1426 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
| 1427 | { |
| 1428 | struct nfs_page *req; |
| 1429 | loff_t range_start = page_offset(page); |
| 1430 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
| 1431 | struct writeback_control wbc = { |
| 1432 | .bdi = page->mapping->backing_dev_info, |
| 1433 | .sync_mode = WB_SYNC_ALL, |
| 1434 | .nr_to_write = LONG_MAX, |
| 1435 | .range_start = range_start, |
| 1436 | .range_end = range_end, |
| 1437 | }; |
| 1438 | int ret = 0; |
| 1439 | |
| 1440 | BUG_ON(!PageLocked(page)); |
| 1441 | for (;;) { |
| 1442 | req = nfs_page_find_request(page); |
| 1443 | if (req == NULL) |
| 1444 | goto out; |
| 1445 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
| 1446 | nfs_release_request(req); |
| 1447 | break; |
| 1448 | } |
| 1449 | if (nfs_lock_request_dontget(req)) { |
| 1450 | nfs_inode_remove_request(req); |
| 1451 | /* |
| 1452 | * In case nfs_inode_remove_request has marked the |
| 1453 | * page as being dirty |
| 1454 | */ |
| 1455 | cancel_dirty_page(page, PAGE_CACHE_SIZE); |
| 1456 | nfs_unlock_request(req); |
| 1457 | break; |
| 1458 | } |
| 1459 | ret = nfs_wait_on_request(req); |
| 1460 | if (ret < 0) |
| 1461 | goto out; |
| 1462 | } |
| 1463 | if (!PagePrivate(page)) |
| 1464 | return 0; |
| 1465 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); |
| 1466 | out: |
| 1467 | return ret; |
| 1468 | } |
| 1469 | |
Adrian Bunk | 5334eb1 | 2007-11-21 15:04:31 -0800 | [diff] [blame] | 1470 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, |
| 1471 | int how) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1472 | { |
| 1473 | loff_t range_start = page_offset(page); |
| 1474 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1475 | struct writeback_control wbc = { |
| 1476 | .bdi = page->mapping->backing_dev_info, |
| 1477 | .sync_mode = WB_SYNC_ALL, |
| 1478 | .nr_to_write = LONG_MAX, |
| 1479 | .range_start = range_start, |
| 1480 | .range_end = range_end, |
| 1481 | }; |
| 1482 | int ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1483 | |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1484 | BUG_ON(!PageLocked(page)); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1485 | if (clear_page_dirty_for_io(page)) { |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1486 | ret = nfs_writepage_locked(page, &wbc); |
| 1487 | if (ret < 0) |
| 1488 | goto out; |
| 1489 | } |
Trond Myklebust | f40313a | 2007-01-13 02:28:08 -0500 | [diff] [blame] | 1490 | if (!PagePrivate(page)) |
| 1491 | return 0; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1492 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
| 1493 | if (ret >= 0) |
| 1494 | return 0; |
| 1495 | out: |
Trond Myklebust | e507d9e | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 1496 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1497 | return ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1498 | } |
| 1499 | |
| 1500 | /* |
| 1501 | * Write back all requests on one page - we do this before reading it. |
| 1502 | */ |
| 1503 | int nfs_wb_page(struct inode *inode, struct page* page) |
| 1504 | { |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1505 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1506 | } |
| 1507 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 1508 | int __init nfs_init_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | { |
| 1510 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", |
| 1511 | sizeof(struct nfs_write_data), |
| 1512 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1513 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | if (nfs_wdata_cachep == NULL) |
| 1515 | return -ENOMEM; |
| 1516 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1517 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
| 1518 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | if (nfs_wdata_mempool == NULL) |
| 1520 | return -ENOMEM; |
| 1521 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1522 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
| 1523 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | if (nfs_commit_mempool == NULL) |
| 1525 | return -ENOMEM; |
| 1526 | |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 1527 | /* |
| 1528 | * NFS congestion size, scale with available memory. |
| 1529 | * |
| 1530 | * 64MB: 8192k |
| 1531 | * 128MB: 11585k |
| 1532 | * 256MB: 16384k |
| 1533 | * 512MB: 23170k |
| 1534 | * 1GB: 32768k |
| 1535 | * 2GB: 46340k |
| 1536 | * 4GB: 65536k |
| 1537 | * 8GB: 92681k |
| 1538 | * 16GB: 131072k |
| 1539 | * |
| 1540 | * This allows larger machines to have larger/more transfers. |
| 1541 | * Limit the default to 256M |
| 1542 | */ |
| 1543 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); |
| 1544 | if (nfs_congestion_kb > 256*1024) |
| 1545 | nfs_congestion_kb = 256*1024; |
| 1546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | return 0; |
| 1548 | } |
| 1549 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 1550 | void nfs_destroy_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | { |
| 1552 | mempool_destroy(nfs_commit_mempool); |
| 1553 | mempool_destroy(nfs_wdata_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1554 | kmem_cache_destroy(nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | } |
| 1556 | |