Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/write.c |
| 3 | * |
Trond Myklebust | 7c85d90 | 2006-12-13 15:23:48 -0500 | [diff] [blame] | 4 | * Write file data over NFS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/types.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/pagemap.h> |
| 13 | #include <linux/file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/writeback.h> |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 15 | #include <linux/swap.h> |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 16 | #include <linux/migrate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include <linux/sunrpc/clnt.h> |
| 19 | #include <linux/nfs_fs.h> |
| 20 | #include <linux/nfs_mount.h> |
| 21 | #include <linux/nfs_page.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 22 | #include <linux/backing-dev.h> |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include "delegation.h" |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 27 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 28 | #include "iostat.h" |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 29 | #include "nfs4_fs.h" |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 30 | #include "fscache.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
| 33 | |
| 34 | #define MIN_POOL_WRITE (32) |
| 35 | #define MIN_POOL_COMMIT (4) |
| 36 | |
| 37 | /* |
| 38 | * Local function declarations |
| 39 | */ |
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); |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 42 | static void nfs_redirty_request(struct nfs_page *req); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 43 | static const struct rpc_call_ops nfs_write_partial_ops; |
| 44 | static const struct rpc_call_ops nfs_write_full_ops; |
| 45 | static const struct rpc_call_ops nfs_commit_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 47 | static struct kmem_cache *nfs_wdata_cachep; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 48 | static mempool_t *nfs_wdata_mempool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | static mempool_t *nfs_commit_mempool; |
| 50 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 51 | struct nfs_write_data *nfs_commitdata_alloc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | { |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 53 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | if (p) { |
| 56 | memset(p, 0, sizeof(*p)); |
| 57 | INIT_LIST_HEAD(&p->pages); |
Andy Adamson | 5f7dbd5 | 2009-04-01 09:22:05 -0400 | [diff] [blame] | 58 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | } |
| 60 | return p; |
| 61 | } |
| 62 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 63 | void nfs_commit_free(struct nfs_write_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | { |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 65 | if (p && (p->pagevec != &p->page_array[0])) |
| 66 | kfree(p->pagevec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | mempool_free(p, nfs_commit_mempool); |
| 68 | } |
| 69 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 70 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 71 | { |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 72 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 73 | |
| 74 | if (p) { |
| 75 | memset(p, 0, sizeof(*p)); |
| 76 | INIT_LIST_HEAD(&p->pages); |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 77 | p->npages = pagecount; |
Andy Adamson | 5f7dbd5 | 2009-04-01 09:22:05 -0400 | [diff] [blame] | 78 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 79 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
| 80 | p->pagevec = p->page_array; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 81 | else { |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 82 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
| 83 | if (!p->pagevec) { |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 84 | mempool_free(p, nfs_wdata_mempool); |
| 85 | p = NULL; |
| 86 | } |
| 87 | } |
| 88 | } |
| 89 | return p; |
| 90 | } |
| 91 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 92 | void nfs_writedata_free(struct nfs_write_data *p) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 93 | { |
| 94 | if (p && (p->pagevec != &p->page_array[0])) |
| 95 | kfree(p->pagevec); |
| 96 | mempool_free(p, nfs_wdata_mempool); |
| 97 | } |
| 98 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 99 | static void nfs_writedata_release(struct nfs_write_data *wdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 101 | put_nfs_open_context(wdata->args.context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | nfs_writedata_free(wdata); |
| 103 | } |
| 104 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 105 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
| 106 | { |
| 107 | ctx->error = error; |
| 108 | smp_wmb(); |
| 109 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 110 | } |
| 111 | |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 112 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
| 113 | { |
| 114 | struct nfs_page *req = NULL; |
| 115 | |
| 116 | if (PagePrivate(page)) { |
| 117 | req = (struct nfs_page *)page_private(page); |
| 118 | if (req != NULL) |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 119 | kref_get(&req->wb_kref); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 120 | } |
| 121 | return req; |
| 122 | } |
| 123 | |
| 124 | static struct nfs_page *nfs_page_find_request(struct page *page) |
| 125 | { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 126 | struct inode *inode = page->mapping->host; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 127 | struct nfs_page *req = NULL; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 128 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 129 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 130 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 131 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 132 | return req; |
| 133 | } |
| 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | /* Adjust the file length if we're writing beyond the end */ |
| 136 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) |
| 137 | { |
| 138 | struct inode *inode = page->mapping->host; |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 139 | loff_t end, i_size; |
| 140 | pgoff_t end_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 142 | spin_lock(&inode->i_lock); |
| 143 | i_size = i_size_read(inode); |
| 144 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | if (i_size > 0 && page->index < end_index) |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 146 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
| 148 | if (i_size >= end) |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 149 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | i_size_write(inode, end); |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 151 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
| 152 | out: |
| 153 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 156 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
| 157 | static void nfs_set_pageerror(struct page *page) |
| 158 | { |
| 159 | SetPageError(page); |
| 160 | nfs_zap_mapping(page->mapping->host, page->mapping); |
| 161 | } |
| 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | /* We can set the PG_uptodate flag if we see that a write request |
| 164 | * covers the full page. |
| 165 | */ |
| 166 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) |
| 167 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | if (PageUptodate(page)) |
| 169 | return; |
| 170 | if (base != 0) |
| 171 | return; |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 172 | if (count != nfs_page_length(page)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | return; |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 174 | SetPageUptodate(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | static int wb_priority(struct writeback_control *wbc) |
| 178 | { |
| 179 | if (wbc->for_reclaim) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 180 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
Wu Fengguang | b17621f | 2009-12-03 13:54:25 +0100 | [diff] [blame] | 181 | if (wbc->for_kupdate || wbc->for_background) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | return FLUSH_LOWPRI; |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 187 | * NFS congestion control |
| 188 | */ |
| 189 | |
| 190 | int nfs_congestion_kb; |
| 191 | |
| 192 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) |
| 193 | #define NFS_CONGESTION_OFF_THRESH \ |
| 194 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) |
| 195 | |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 196 | static int nfs_set_page_writeback(struct page *page) |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 197 | { |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 198 | int ret = test_set_page_writeback(page); |
| 199 | |
| 200 | if (!ret) { |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 201 | struct inode *inode = page->mapping->host; |
| 202 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 203 | |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 204 | page_cache_get(page); |
Peter Zijlstra | 277866a | 2007-05-08 00:35:12 -0700 | [diff] [blame] | 205 | if (atomic_long_inc_return(&nfss->writeback) > |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 206 | NFS_CONGESTION_ON_THRESH) { |
| 207 | set_bdi_congested(&nfss->backing_dev_info, |
| 208 | BLK_RW_ASYNC); |
| 209 | } |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 210 | } |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 211 | return ret; |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | static void nfs_end_page_writeback(struct page *page) |
| 215 | { |
| 216 | struct inode *inode = page->mapping->host; |
| 217 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 218 | |
| 219 | end_page_writeback(page); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 220 | page_cache_release(page); |
Peter Zijlstra | c4dc4be | 2007-10-16 23:25:41 -0700 | [diff] [blame] | 221 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 222 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 223 | } |
| 224 | |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 225 | static struct nfs_page *nfs_find_and_lock_request(struct page *page) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 226 | { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 227 | struct inode *inode = page->mapping->host; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 228 | struct nfs_page *req; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 229 | int ret; |
| 230 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 231 | spin_lock(&inode->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 232 | for (;;) { |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 233 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 234 | if (req == NULL) |
| 235 | break; |
Trond Myklebust | acee478 | 2008-01-22 17:13:07 -0500 | [diff] [blame] | 236 | if (nfs_set_page_tag_locked(req)) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 237 | break; |
| 238 | /* 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] | 239 | * then the call to nfs_set_page_tag_locked() will always |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 240 | * succeed provided that someone hasn't already marked the |
| 241 | * request as dirty (in which case we don't care). |
| 242 | */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 243 | spin_unlock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 244 | ret = nfs_wait_on_request(req); |
| 245 | nfs_release_request(req); |
| 246 | if (ret != 0) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 247 | return ERR_PTR(ret); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 248 | spin_lock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 249 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 250 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 251 | return req; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Find an associated nfs write request, and prepare to flush it out |
| 256 | * May return an error if the user signalled nfs_wait_on_request(). |
| 257 | */ |
| 258 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
| 259 | struct page *page) |
| 260 | { |
| 261 | struct nfs_page *req; |
| 262 | int ret = 0; |
| 263 | |
| 264 | req = nfs_find_and_lock_request(page); |
| 265 | if (!req) |
| 266 | goto out; |
| 267 | ret = PTR_ERR(req); |
| 268 | if (IS_ERR(req)) |
| 269 | goto out; |
| 270 | |
| 271 | ret = nfs_set_page_writeback(page); |
| 272 | BUG_ON(ret != 0); |
| 273 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); |
| 274 | |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 275 | if (!nfs_pageio_add_request(pgio, req)) { |
| 276 | nfs_redirty_request(req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 277 | ret = pgio->pg_error; |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 278 | } |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 279 | out: |
| 280 | return ret; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 281 | } |
| 282 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 283 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
| 284 | { |
| 285 | struct inode *inode = page->mapping->host; |
| 286 | |
| 287 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
| 288 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); |
| 289 | |
| 290 | nfs_pageio_cond_complete(pgio, page->index); |
| 291 | return nfs_page_async_flush(pgio, page); |
| 292 | } |
| 293 | |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 294 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | * Write an mmapped page to the server. |
| 296 | */ |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 297 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 299 | struct nfs_pageio_descriptor pgio; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 300 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 302 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
| 303 | err = nfs_do_writepage(page, wbc, &pgio); |
| 304 | nfs_pageio_complete(&pgio); |
| 305 | if (err < 0) |
| 306 | return err; |
| 307 | if (pgio.pg_error < 0) |
| 308 | return pgio.pg_error; |
| 309 | return 0; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | int nfs_writepage(struct page *page, struct writeback_control *wbc) |
| 313 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 314 | int ret; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 315 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 316 | ret = nfs_writepage_locked(page, wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | unlock_page(page); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 318 | return ret; |
| 319 | } |
| 320 | |
| 321 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) |
| 322 | { |
| 323 | int ret; |
| 324 | |
| 325 | ret = nfs_do_writepage(page, wbc, data); |
| 326 | unlock_page(page); |
| 327 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | } |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
| 331 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | struct inode *inode = mapping->host; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 333 | unsigned long *bitlock = &NFS_I(inode)->flags; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 334 | struct nfs_pageio_descriptor pgio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | int err; |
| 336 | |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 337 | /* Stop dirtying of new pages while we sync */ |
| 338 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, |
| 339 | nfs_wait_bit_killable, TASK_KILLABLE); |
| 340 | if (err) |
| 341 | goto out_err; |
| 342 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 343 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
| 344 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 345 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 346 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 347 | nfs_pageio_complete(&pgio); |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 348 | |
| 349 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); |
| 350 | smp_mb__after_clear_bit(); |
| 351 | wake_up_bit(bitlock, NFS_INO_FLUSHING); |
| 352 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 353 | if (err < 0) |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 354 | goto out_err; |
| 355 | err = pgio.pg_error; |
| 356 | if (err < 0) |
| 357 | goto out_err; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 358 | return 0; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 359 | out_err: |
| 360 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Insert a write request into an inode |
| 365 | */ |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 366 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
| 368 | struct nfs_inode *nfsi = NFS_I(inode); |
| 369 | int error; |
| 370 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 371 | error = radix_tree_preload(GFP_NOFS); |
| 372 | if (error != 0) |
| 373 | goto out; |
| 374 | |
| 375 | /* Lock the request! */ |
| 376 | nfs_lock_request_dontget(req); |
| 377 | |
| 378 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
Nick Piggin | 2785259 | 2008-02-04 23:48:37 -0800 | [diff] [blame] | 380 | BUG_ON(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | if (!nfsi->npages) { |
| 382 | igrab(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
| 384 | nfsi->change_attr++; |
| 385 | } |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 386 | SetPagePrivate(req->wb_page); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 387 | set_page_private(req->wb_page, (unsigned long)req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | nfsi->npages++; |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 389 | kref_get(&req->wb_kref); |
Nick Piggin | 2785259 | 2008-02-04 23:48:37 -0800 | [diff] [blame] | 390 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
| 391 | NFS_PAGE_TAG_LOCKED); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 392 | spin_unlock(&inode->i_lock); |
| 393 | radix_tree_preload_end(); |
| 394 | out: |
| 395 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 399 | * Remove a write request from an inode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | */ |
| 401 | static void nfs_inode_remove_request(struct nfs_page *req) |
| 402 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 403 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | struct nfs_inode *nfsi = NFS_I(inode); |
| 405 | |
| 406 | BUG_ON (!NFS_WBACK_BUSY(req)); |
| 407 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 408 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 409 | set_page_private(req->wb_page, 0); |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 410 | ClearPagePrivate(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
| 412 | nfsi->npages--; |
| 413 | if (!nfsi->npages) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 414 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | iput(inode); |
| 416 | } else |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 417 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | nfs_clear_request(req); |
| 419 | nfs_release_request(req); |
| 420 | } |
| 421 | |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 422 | static void |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 423 | nfs_mark_request_dirty(struct nfs_page *req) |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 424 | { |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 425 | __set_page_dirty_nobuffers(req->wb_page); |
Trond Myklebust | b80c3cb | 2010-04-09 19:07:07 -0400 | [diff] [blame] | 426 | __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC); |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 427 | } |
| 428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 430 | /* |
| 431 | * Add a request to the inode's commit list. |
| 432 | */ |
| 433 | static void |
| 434 | nfs_mark_request_commit(struct nfs_page *req) |
| 435 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 436 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | struct nfs_inode *nfsi = NFS_I(inode); |
| 438 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 439 | spin_lock(&inode->i_lock); |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 440 | set_bit(PG_CLEAN, &(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 | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 444 | nfsi->ncommit++; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 445 | spin_unlock(&inode->i_lock); |
Christoph Lameter | fd39fc8 | 2006-06-30 01:55:40 -0700 | [diff] [blame] | 446 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 447 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
Trond Myklebust | a180304 | 2006-12-05 00:45:19 -0500 | [diff] [blame] | 448 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 450 | |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 451 | static int |
| 452 | nfs_clear_request_commit(struct nfs_page *req) |
| 453 | { |
| 454 | struct page *page = req->wb_page; |
| 455 | |
| 456 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { |
| 457 | dec_zone_page_state(page, NR_UNSTABLE_NFS); |
| 458 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
| 459 | return 1; |
| 460 | } |
| 461 | return 0; |
| 462 | } |
| 463 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 464 | static inline |
| 465 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 466 | { |
| 467 | return data->verf.committed != NFS_FILE_SYNC; |
| 468 | } |
| 469 | |
| 470 | static inline |
| 471 | int nfs_reschedule_unstable_write(struct nfs_page *req) |
| 472 | { |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 473 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 474 | nfs_mark_request_commit(req); |
| 475 | return 1; |
| 476 | } |
| 477 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 478 | nfs_mark_request_dirty(req); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 479 | return 1; |
| 480 | } |
| 481 | return 0; |
| 482 | } |
| 483 | #else |
| 484 | static inline void |
| 485 | nfs_mark_request_commit(struct nfs_page *req) |
| 486 | { |
| 487 | } |
| 488 | |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 489 | static inline int |
| 490 | nfs_clear_request_commit(struct nfs_page *req) |
| 491 | { |
| 492 | return 0; |
| 493 | } |
| 494 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 495 | static inline |
| 496 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 497 | { |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static inline |
| 502 | int nfs_reschedule_unstable_write(struct nfs_page *req) |
| 503 | { |
| 504 | return 0; |
| 505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | #endif |
| 507 | |
Trond Myklebust | 47c6256 | 2009-03-16 08:13:41 -0400 | [diff] [blame] | 508 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 509 | static int |
| 510 | nfs_need_commit(struct nfs_inode *nfsi) |
| 511 | { |
| 512 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); |
| 513 | } |
| 514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | /* |
| 516 | * nfs_scan_commit - Scan an inode for commit requests |
| 517 | * @inode: NFS inode to scan |
| 518 | * @dst: destination list |
| 519 | * @idx_start: lower bound of page->index to scan. |
| 520 | * @npages: idx_start + npages sets the upper bound to scan. |
| 521 | * |
| 522 | * Moves requests from the inode's 'commit' request list. |
| 523 | * The requests are *not* checked to ensure that they form a contiguous set. |
| 524 | */ |
| 525 | static int |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 526 | 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] | 527 | { |
| 528 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 529 | int ret; |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 530 | |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 531 | if (!nfs_need_commit(nfsi)) |
| 532 | return 0; |
| 533 | |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 534 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
| 535 | if (ret > 0) |
| 536 | nfsi->ncommit -= ret; |
Trond Myklebust | 2928db1 | 2010-02-19 17:03:18 -0800 | [diff] [blame] | 537 | if (nfs_need_commit(NFS_I(inode))) |
| 538 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 539 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 541 | #else |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 542 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
| 543 | { |
| 544 | return 0; |
| 545 | } |
| 546 | |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 547 | 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] | 548 | { |
| 549 | return 0; |
| 550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | #endif |
| 552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | /* |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 554 | * Search for an existing write request, and attempt to update |
| 555 | * it to reflect a new dirty region on a given page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | * |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 557 | * If the attempt fails, then the existing request is flushed out |
| 558 | * to disk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | */ |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 560 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
| 561 | struct page *page, |
| 562 | unsigned int offset, |
| 563 | unsigned int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 565 | struct nfs_page *req; |
| 566 | unsigned int rqend; |
| 567 | unsigned int end; |
| 568 | int error; |
| 569 | |
| 570 | if (!PagePrivate(page)) |
| 571 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
| 573 | end = offset + bytes; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 574 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | for (;;) { |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 577 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 578 | if (req == NULL) |
| 579 | goto out_unlock; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 580 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 581 | rqend = req->wb_offset + req->wb_bytes; |
| 582 | /* |
| 583 | * Tell the caller to flush out the request if |
| 584 | * the offsets are non-contiguous. |
| 585 | * Note: nfs_flush_incompatible() will already |
| 586 | * have flushed out requests having wrong owners. |
| 587 | */ |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 588 | if (offset > rqend |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 589 | || end < req->wb_offset) |
| 590 | goto out_flushme; |
| 591 | |
| 592 | if (nfs_set_page_tag_locked(req)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 595 | /* The request is locked, so wait and then retry */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 596 | spin_unlock(&inode->i_lock); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 597 | error = nfs_wait_on_request(req); |
| 598 | nfs_release_request(req); |
| 599 | if (error != 0) |
| 600 | goto out_err; |
| 601 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
| 603 | |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 604 | if (nfs_clear_request_commit(req) && |
| 605 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, |
| 606 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) |
| 607 | NFS_I(inode)->ncommit--; |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | /* Okay, the request matches. Update the region */ |
| 610 | if (offset < req->wb_offset) { |
| 611 | req->wb_offset = offset; |
| 612 | req->wb_pgbase = offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | if (end > rqend) |
| 615 | req->wb_bytes = end - req->wb_offset; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 616 | else |
| 617 | req->wb_bytes = rqend - req->wb_offset; |
| 618 | out_unlock: |
| 619 | spin_unlock(&inode->i_lock); |
| 620 | return req; |
| 621 | out_flushme: |
| 622 | spin_unlock(&inode->i_lock); |
| 623 | nfs_release_request(req); |
| 624 | error = nfs_wb_page(inode, page); |
| 625 | out_err: |
| 626 | return ERR_PTR(error); |
| 627 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 629 | /* |
| 630 | * Try to update an existing write request, or create one if there is none. |
| 631 | * |
| 632 | * Note: Should always be called with the Page Lock held to prevent races |
| 633 | * if we have to add a new request. Also assumes that the caller has |
| 634 | * already called nfs_flush_incompatible() if necessary. |
| 635 | */ |
| 636 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, |
| 637 | struct page *page, unsigned int offset, unsigned int bytes) |
| 638 | { |
| 639 | struct inode *inode = page->mapping->host; |
| 640 | struct nfs_page *req; |
| 641 | int error; |
| 642 | |
| 643 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
| 644 | if (req != NULL) |
| 645 | goto out; |
| 646 | req = nfs_create_request(ctx, inode, page, offset, bytes); |
| 647 | if (IS_ERR(req)) |
| 648 | goto out; |
| 649 | error = nfs_inode_add_request(inode, req); |
| 650 | if (error != 0) { |
| 651 | nfs_release_request(req); |
| 652 | req = ERR_PTR(error); |
| 653 | } |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 654 | out: |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 655 | return req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | } |
| 657 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 658 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
| 659 | unsigned int offset, unsigned int count) |
| 660 | { |
| 661 | struct nfs_page *req; |
| 662 | |
| 663 | req = nfs_setup_write_request(ctx, page, offset, count); |
| 664 | if (IS_ERR(req)) |
| 665 | return PTR_ERR(req); |
Trond Myklebust | b80c3cb | 2010-04-09 19:07:07 -0400 | [diff] [blame] | 666 | nfs_mark_request_dirty(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 667 | /* Update file length */ |
| 668 | nfs_grow_file(page, offset, count); |
| 669 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 670 | nfs_mark_request_dirty(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 671 | nfs_clear_page_tag_locked(req); |
| 672 | return 0; |
| 673 | } |
| 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | int nfs_flush_incompatible(struct file *file, struct page *page) |
| 676 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 677 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | struct nfs_page *req; |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 679 | int do_flush, status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | /* |
| 681 | * Look for a request corresponding to this page. If there |
| 682 | * is one, and it belongs to another file, we flush it out |
| 683 | * before we try to copy anything into the page. Do this |
| 684 | * due to the lack of an ACCESS-type call in NFSv2. |
| 685 | * Also do the same if we find a request from an existing |
| 686 | * dropped page. |
| 687 | */ |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 688 | do { |
| 689 | req = nfs_page_find_request(page); |
| 690 | if (req == NULL) |
| 691 | return 0; |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 692 | do_flush = req->wb_page != page || req->wb_context != ctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | nfs_release_request(req); |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 694 | if (!do_flush) |
| 695 | return 0; |
| 696 | status = nfs_wb_page(page->mapping->host, page); |
| 697 | } while (status == 0); |
| 698 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | /* |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 702 | * If the page cache is marked as unsafe or invalid, then we can't rely on |
| 703 | * the PageUptodate() flag. In this case, we will need to turn off |
| 704 | * write optimisations that depend on the page contents being correct. |
| 705 | */ |
| 706 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) |
| 707 | { |
| 708 | return PageUptodate(page) && |
| 709 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); |
| 710 | } |
| 711 | |
| 712 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | * Update and possibly write a cached page of an NFS file. |
| 714 | * |
| 715 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad |
| 716 | * things with a page scheduled for an RPC call (e.g. invalidate it). |
| 717 | */ |
| 718 | int nfs_updatepage(struct file *file, struct page *page, |
| 719 | unsigned int offset, unsigned int count) |
| 720 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 721 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | struct inode *inode = page->mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | int status = 0; |
| 724 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 725 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
| 726 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 727 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 728 | file->f_path.dentry->d_parent->d_name.name, |
| 729 | file->f_path.dentry->d_name.name, count, |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 730 | (long long)(page_offset(page) + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | /* 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] | 733 | * is up to date, it may be more efficient to extend the write |
| 734 | * to cover the entire page in order to avoid fragmentation |
| 735 | * inefficiencies. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | */ |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 737 | if (nfs_write_pageuptodate(page, inode) && |
| 738 | inode->i_flock == NULL && |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 739 | !(file->f_flags & O_DSYNC)) { |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 740 | count = max(count + offset, nfs_page_length(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 744 | status = nfs_writepage_setup(ctx, page, offset, count); |
Trond Myklebust | 03fa9e8 | 2008-06-05 16:02:35 -0400 | [diff] [blame] | 745 | if (status < 0) |
| 746 | nfs_set_pageerror(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 748 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | status, (long long)i_size_read(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return status; |
| 751 | } |
| 752 | |
| 753 | static void nfs_writepage_release(struct nfs_page *req) |
| 754 | { |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 755 | struct page *page = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 757 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 758 | nfs_inode_remove_request(req); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 759 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 760 | nfs_end_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | } |
| 762 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 763 | static int flush_task_priority(int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | { |
| 765 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { |
| 766 | case FLUSH_HIGHPRI: |
| 767 | return RPC_PRIORITY_HIGH; |
| 768 | case FLUSH_LOWPRI: |
| 769 | return RPC_PRIORITY_LOW; |
| 770 | } |
| 771 | return RPC_PRIORITY_NORMAL; |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Set up the argument/result storage required for the RPC call. |
| 776 | */ |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 777 | static int nfs_write_rpcsetup(struct nfs_page *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | struct nfs_write_data *data, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 779 | const struct rpc_call_ops *call_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | unsigned int count, unsigned int offset, |
| 781 | int how) |
| 782 | { |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 783 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 784 | int priority = flush_task_priority(how); |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 785 | struct rpc_task *task; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 786 | struct rpc_message msg = { |
| 787 | .rpc_argp = &data->args, |
| 788 | .rpc_resp = &data->res, |
| 789 | .rpc_cred = req->wb_context->cred, |
| 790 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 791 | struct rpc_task_setup task_setup_data = { |
| 792 | .rpc_client = NFS_CLIENT(inode), |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 793 | .task = &data->task, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 794 | .rpc_message = &msg, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 795 | .callback_ops = call_ops, |
| 796 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 797 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 798 | .flags = RPC_TASK_ASYNC, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 799 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 800 | }; |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 801 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
| 803 | /* Set up the RPC argument and reply structs |
| 804 | * NB: take care not to mess about with data->commit et al. */ |
| 805 | |
| 806 | data->req = req; |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 807 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 808 | data->cred = msg.rpc_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | data->args.fh = NFS_FH(inode); |
| 811 | data->args.offset = req_offset(req) + offset; |
| 812 | data->args.pgbase = req->wb_pgbase + offset; |
| 813 | data->args.pages = data->pagevec; |
| 814 | data->args.count = count; |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 815 | data->args.context = get_nfs_open_context(req->wb_context); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 816 | data->args.stable = NFS_UNSTABLE; |
| 817 | if (how & FLUSH_STABLE) { |
| 818 | data->args.stable = NFS_DATA_SYNC; |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 819 | if (!nfs_need_commit(NFS_I(inode))) |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 820 | data->args.stable = NFS_FILE_SYNC; |
| 821 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
| 823 | data->res.fattr = &data->fattr; |
| 824 | data->res.count = count; |
| 825 | data->res.verf = &data->verf; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 826 | nfs_fattr_init(&data->fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 828 | /* Set up the initial task struct. */ |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 829 | NFS_PROTO(inode)->write_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 831 | dprintk("NFS: %5u initiated write call " |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 832 | "(req %s/%lld, %u bytes @ offset %llu)\n", |
Chuck Lever | 0bbacc4 | 2005-11-01 16:53:32 -0500 | [diff] [blame] | 833 | data->task.tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | inode->i_sb->s_id, |
| 835 | (long long)NFS_FILEID(inode), |
| 836 | count, |
| 837 | (unsigned long long)data->args.offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 839 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 840 | if (IS_ERR(task)) { |
| 841 | ret = PTR_ERR(task); |
| 842 | goto out; |
| 843 | } |
| 844 | if (how & FLUSH_SYNC) { |
| 845 | ret = rpc_wait_for_completion_task(task); |
| 846 | if (ret == 0) |
| 847 | ret = task->tk_status; |
| 848 | } |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 849 | rpc_put_task(task); |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 850 | out: |
| 851 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 854 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
| 855 | * call this on each, which will prepare them to be retried on next |
| 856 | * writeback using standard nfs. |
| 857 | */ |
| 858 | static void nfs_redirty_request(struct nfs_page *req) |
| 859 | { |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 860 | struct page *page = req->wb_page; |
| 861 | |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 862 | nfs_mark_request_dirty(req); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 863 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 864 | nfs_end_page_writeback(page); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 865 | } |
| 866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | /* |
| 868 | * Generate multiple small requests to write out a single |
| 869 | * contiguous dirty area on one page. |
| 870 | */ |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 871 | 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] | 872 | { |
| 873 | struct nfs_page *req = nfs_list_entry(head->next); |
| 874 | struct page *page = req->wb_page; |
| 875 | struct nfs_write_data *data; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 876 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
| 877 | unsigned int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | int requests = 0; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 879 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | LIST_HEAD(list); |
| 881 | |
| 882 | nfs_list_remove_request(req); |
| 883 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 884 | nbytes = count; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 885 | do { |
| 886 | size_t len = min(nbytes, wsize); |
| 887 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 888 | data = nfs_writedata_alloc(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | if (!data) |
| 890 | goto out_bad; |
| 891 | list_add(&data->pages, &list); |
| 892 | requests++; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 893 | nbytes -= len; |
| 894 | } while (nbytes != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | atomic_set(&req->wb_complete, requests); |
| 896 | |
| 897 | ClearPageError(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | offset = 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 899 | nbytes = count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | do { |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 901 | int ret2; |
| 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 904 | list_del_init(&data->pages); |
| 905 | |
| 906 | data->pagevec[0] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 908 | if (nbytes < wsize) |
| 909 | wsize = nbytes; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 910 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 911 | wsize, offset, how); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 912 | if (ret == 0) |
| 913 | ret = ret2; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 914 | offset += wsize; |
| 915 | nbytes -= wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } while (nbytes != 0); |
| 917 | |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 918 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
| 920 | out_bad: |
| 921 | while (!list_empty(&list)) { |
| 922 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 923 | list_del(&data->pages); |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 924 | nfs_writedata_release(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | } |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 926 | nfs_redirty_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | return -ENOMEM; |
| 928 | } |
| 929 | |
| 930 | /* |
| 931 | * Create an RPC task for the given write request and kick it. |
| 932 | * The page must have been locked by the caller. |
| 933 | * |
| 934 | * It may happen that the page we're passed is not marked dirty. |
| 935 | * This is the case if nfs_updatepage detects a conflicting request |
| 936 | * that has been written but not committed. |
| 937 | */ |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 938 | 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] | 939 | { |
| 940 | struct nfs_page *req; |
| 941 | struct page **pages; |
| 942 | struct nfs_write_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 944 | data = nfs_writedata_alloc(npages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | if (!data) |
| 946 | goto out_bad; |
| 947 | |
| 948 | pages = data->pagevec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | while (!list_empty(head)) { |
| 950 | req = nfs_list_entry(head->next); |
| 951 | nfs_list_remove_request(req); |
| 952 | nfs_list_add_request(req, &data->pages); |
| 953 | ClearPageError(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | *pages++ = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | } |
| 956 | req = nfs_list_entry(data->pages.next); |
| 957 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | /* Set up the argument struct */ |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 959 | return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | out_bad: |
| 961 | while (!list_empty(head)) { |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 962 | req = nfs_list_entry(head->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | nfs_list_remove_request(req); |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 964 | nfs_redirty_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | } |
| 966 | return -ENOMEM; |
| 967 | } |
| 968 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 969 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
| 970 | struct inode *inode, int ioflags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | { |
Chuck Lever | bf4285e | 2007-12-20 14:54:57 -0500 | [diff] [blame] | 972 | size_t wsize = NFS_SERVER(inode)->wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 974 | if (wsize < PAGE_CACHE_SIZE) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 975 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 976 | else |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 977 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } |
| 979 | |
| 980 | /* |
| 981 | * Handle a write reply that flushed part of a page. |
| 982 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 983 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 985 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 987 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
| 988 | task->tk_pid, |
| 989 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 990 | (long long) |
| 991 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), |
| 992 | data->req->wb_bytes, (long long)req_offset(data->req)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 994 | nfs_writeback_done(task, data); |
| 995 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 996 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 997 | static void nfs_writeback_release_partial(void *calldata) |
| 998 | { |
| 999 | struct nfs_write_data *data = calldata; |
| 1000 | struct nfs_page *req = data->req; |
| 1001 | struct page *page = req->wb_page; |
| 1002 | int status = data->task.tk_status; |
| 1003 | |
| 1004 | if (status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 1005 | nfs_set_pageerror(page); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1006 | nfs_context_set_write_error(req->wb_context, status); |
| 1007 | dprintk(", error = %d\n", status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1008 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | } |
| 1010 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1011 | if (nfs_write_need_commit(data)) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1012 | struct inode *inode = page->mapping->host; |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1013 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1014 | spin_lock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1015 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
| 1016 | /* Do nothing we need to resend the writes */ |
| 1017 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
| 1018 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
| 1019 | dprintk(" defer commit\n"); |
| 1020 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { |
| 1021 | set_bit(PG_NEED_RESCHED, &req->wb_flags); |
| 1022 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); |
| 1023 | dprintk(" server reboot detected\n"); |
| 1024 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1025 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1026 | } else |
| 1027 | dprintk(" OK\n"); |
| 1028 | |
| 1029 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | if (atomic_dec_and_test(&req->wb_complete)) |
| 1031 | nfs_writepage_release(req); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1032 | nfs_writedata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | } |
| 1034 | |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1035 | #if defined(CONFIG_NFS_V4_1) |
| 1036 | void nfs_write_prepare(struct rpc_task *task, void *calldata) |
| 1037 | { |
| 1038 | struct nfs_write_data *data = calldata; |
| 1039 | struct nfs_client *clp = (NFS_SERVER(data->inode))->nfs_client; |
| 1040 | |
| 1041 | if (nfs4_setup_sequence(clp, &data->args.seq_args, |
| 1042 | &data->res.seq_res, 1, task)) |
| 1043 | return; |
| 1044 | rpc_call_start(task); |
| 1045 | } |
| 1046 | #endif /* CONFIG_NFS_V4_1 */ |
| 1047 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1048 | static const struct rpc_call_ops nfs_write_partial_ops = { |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1049 | #if defined(CONFIG_NFS_V4_1) |
| 1050 | .rpc_call_prepare = nfs_write_prepare, |
| 1051 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1052 | .rpc_call_done = nfs_writeback_done_partial, |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1053 | .rpc_release = nfs_writeback_release_partial, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1054 | }; |
| 1055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | /* |
| 1057 | * Handle a write reply that flushes a whole page. |
| 1058 | * |
| 1059 | * FIXME: There is an inherent race with invalidate_inode_pages and |
| 1060 | * writebacks since the page->count is kept > 1 for as long |
| 1061 | * as the page has a write request pending. |
| 1062 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1063 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1065 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1067 | nfs_writeback_done(task, data); |
| 1068 | } |
| 1069 | |
| 1070 | static void nfs_writeback_release_full(void *calldata) |
| 1071 | { |
| 1072 | struct nfs_write_data *data = calldata; |
| 1073 | int status = data->task.tk_status; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | /* Update attributes as result of writeback. */ |
| 1076 | while (!list_empty(&data->pages)) { |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1077 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
| 1078 | struct page *page = req->wb_page; |
| 1079 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | nfs_list_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1082 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
| 1083 | data->task.tk_pid, |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1084 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1085 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | req->wb_bytes, |
| 1087 | (long long)req_offset(req)); |
| 1088 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1089 | if (status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 1090 | nfs_set_pageerror(page); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1091 | nfs_context_set_write_error(req->wb_context, status); |
| 1092 | dprintk(", error = %d\n", status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1093 | goto remove_request; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1096 | if (nfs_write_need_commit(data)) { |
| 1097 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
| 1098 | nfs_mark_request_commit(req); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1099 | dprintk(" marked for commit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | goto next; |
| 1101 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1102 | dprintk(" OK\n"); |
| 1103 | remove_request: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | nfs_inode_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1106 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 1107 | nfs_end_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | } |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1109 | nfs_writedata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | } |
| 1111 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1112 | static const struct rpc_call_ops nfs_write_full_ops = { |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1113 | #if defined(CONFIG_NFS_V4_1) |
| 1114 | .rpc_call_prepare = nfs_write_prepare, |
| 1115 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1116 | .rpc_call_done = nfs_writeback_done_full, |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1117 | .rpc_release = nfs_writeback_release_full, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1118 | }; |
| 1119 | |
| 1120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | /* |
| 1122 | * This function is called when the WRITE call is complete. |
| 1123 | */ |
Chuck Lever | 462d5b3 | 2006-03-20 13:44:32 -0500 | [diff] [blame] | 1124 | 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] | 1125 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | struct nfs_writeargs *argp = &data->args; |
| 1127 | struct nfs_writeres *resp = &data->res; |
Andy Adamson | eedc020 | 2009-04-01 09:22:41 -0400 | [diff] [blame] | 1128 | struct nfs_server *server = NFS_SERVER(data->inode); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1129 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1131 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | task->tk_pid, task->tk_status); |
| 1133 | |
Chuck Lever | f551e44 | 2006-09-20 14:33:04 -0400 | [diff] [blame] | 1134 | /* |
| 1135 | * ->write_done will attempt to use post-op attributes to detect |
| 1136 | * conflicting writes by other clients. A strict interpretation |
| 1137 | * of close-to-open would allow us to continue caching even if |
| 1138 | * another writer had changed the file, but some applications |
| 1139 | * depend on tighter cache coherency when writing. |
| 1140 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1141 | status = NFS_PROTO(data->inode)->write_done(task, data); |
| 1142 | if (status != 0) |
| 1143 | return status; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1144 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
| 1145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 1147 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { |
| 1148 | /* We tried a write call, but the server did not |
| 1149 | * commit data to stable storage even though we |
| 1150 | * requested it. |
| 1151 | * Note: There is a known bug in Tru64 < 5.0 in which |
| 1152 | * the server reports NFS_DATA_SYNC, but performs |
| 1153 | * NFS_FILE_SYNC. We therefore implement this checking |
| 1154 | * as a dprintk() in order to avoid filling syslog. |
| 1155 | */ |
| 1156 | static unsigned long complain; |
| 1157 | |
| 1158 | if (time_before(complain, jiffies)) { |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1159 | dprintk("NFS: faulty NFS server %s:" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | " (committed = %d) != (stable = %d)\n", |
Andy Adamson | eedc020 | 2009-04-01 09:22:41 -0400 | [diff] [blame] | 1161 | server->nfs_client->cl_hostname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | resp->verf->committed, argp->stable); |
| 1163 | complain = jiffies + 300 * HZ; |
| 1164 | } |
| 1165 | } |
| 1166 | #endif |
| 1167 | /* Is this a short write? */ |
| 1168 | if (task->tk_status >= 0 && resp->count < argp->count) { |
| 1169 | static unsigned long complain; |
| 1170 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1171 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
| 1172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | /* Has the server at least made some progress? */ |
| 1174 | if (resp->count != 0) { |
| 1175 | /* Was this an NFSv2 write or an NFSv3 stable write? */ |
| 1176 | if (resp->verf->committed != NFS_UNSTABLE) { |
| 1177 | /* Resend from where the server left off */ |
| 1178 | argp->offset += resp->count; |
| 1179 | argp->pgbase += resp->count; |
| 1180 | argp->count -= resp->count; |
| 1181 | } else { |
| 1182 | /* Resend as a stable write in order to avoid |
| 1183 | * headaches in the case of a server crash. |
| 1184 | */ |
| 1185 | argp->stable = NFS_FILE_SYNC; |
| 1186 | } |
Trond Myklebust | 0110ee1 | 2009-12-07 09:00:24 -0500 | [diff] [blame] | 1187 | nfs_restart_rpc(task, server->nfs_client); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1188 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | } |
| 1190 | if (time_before(complain, jiffies)) { |
| 1191 | printk(KERN_WARNING |
| 1192 | "NFS: Server wrote zero bytes, expected %u.\n", |
| 1193 | argp->count); |
| 1194 | complain = jiffies + 300 * HZ; |
| 1195 | } |
| 1196 | /* Can't do anything about it except throw an error. */ |
| 1197 | task->tk_status = -EIO; |
| 1198 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1199 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | } |
| 1201 | |
| 1202 | |
| 1203 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1204 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
| 1205 | { |
| 1206 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
| 1207 | return 1; |
| 1208 | if (may_wait && !out_of_line_wait_on_bit_lock(&nfsi->flags, |
| 1209 | NFS_INO_COMMIT, nfs_wait_bit_killable, |
| 1210 | TASK_KILLABLE)) |
| 1211 | return 1; |
| 1212 | return 0; |
| 1213 | } |
| 1214 | |
| 1215 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
| 1216 | { |
| 1217 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); |
| 1218 | smp_mb__after_clear_bit(); |
| 1219 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); |
| 1220 | } |
| 1221 | |
| 1222 | |
H Hartley Sweeten | 0aa0588 | 2010-01-26 15:42:03 -0500 | [diff] [blame] | 1223 | static void nfs_commitdata_release(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | { |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 1225 | struct nfs_write_data *wdata = data; |
| 1226 | |
| 1227 | put_nfs_open_context(wdata->args.context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | nfs_commit_free(wdata); |
| 1229 | } |
| 1230 | |
| 1231 | /* |
| 1232 | * Set up the argument/result storage required for the RPC call. |
| 1233 | */ |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1234 | static int nfs_commit_rpcsetup(struct list_head *head, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1235 | struct nfs_write_data *data, |
| 1236 | int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | { |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1238 | struct nfs_page *first = nfs_list_entry(head->next); |
| 1239 | struct inode *inode = first->wb_context->path.dentry->d_inode; |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1240 | int priority = flush_task_priority(how); |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1241 | struct rpc_task *task; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1242 | struct rpc_message msg = { |
| 1243 | .rpc_argp = &data->args, |
| 1244 | .rpc_resp = &data->res, |
| 1245 | .rpc_cred = first->wb_context->cred, |
| 1246 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1247 | struct rpc_task_setup task_setup_data = { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1248 | .task = &data->task, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1249 | .rpc_client = NFS_CLIENT(inode), |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1250 | .rpc_message = &msg, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1251 | .callback_ops = &nfs_commit_ops, |
| 1252 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 1253 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 1254 | .flags = RPC_TASK_ASYNC, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1255 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1256 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | |
| 1258 | /* Set up the RPC argument and reply structs |
| 1259 | * NB: take care not to mess about with data->commit et al. */ |
| 1260 | |
| 1261 | list_splice_init(head, &data->pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | data->inode = inode; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1264 | data->cred = msg.rpc_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | data->args.fh = NFS_FH(data->inode); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1267 | /* Note: we always request a commit of the entire inode */ |
| 1268 | data->args.offset = 0; |
| 1269 | data->args.count = 0; |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 1270 | data->args.context = get_nfs_open_context(first->wb_context); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1271 | data->res.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | data->res.fattr = &data->fattr; |
| 1273 | data->res.verf = &data->verf; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 1274 | nfs_fattr_init(&data->fattr); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1275 | |
| 1276 | /* Set up the initial task struct. */ |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1277 | NFS_PROTO(inode)->commit_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1279 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1280 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1281 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1282 | if (IS_ERR(task)) |
| 1283 | return PTR_ERR(task); |
| 1284 | rpc_put_task(task); |
| 1285 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | } |
| 1287 | |
| 1288 | /* |
| 1289 | * Commit dirty pages |
| 1290 | */ |
| 1291 | static int |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 1292 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | { |
| 1294 | struct nfs_write_data *data; |
| 1295 | struct nfs_page *req; |
| 1296 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1297 | data = nfs_commitdata_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
| 1299 | if (!data) |
| 1300 | goto out_bad; |
| 1301 | |
| 1302 | /* Set up the argument struct */ |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1303 | return nfs_commit_rpcsetup(head, data, how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | out_bad: |
| 1305 | while (!list_empty(head)) { |
| 1306 | req = nfs_list_entry(head->next); |
| 1307 | nfs_list_remove_request(req); |
| 1308 | nfs_mark_request_commit(req); |
Trond Myklebust | 83715ad | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 1309 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 1310 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
| 1311 | BDI_RECLAIMABLE); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1312 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | } |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1314 | nfs_commit_clear_lock(NFS_I(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | return -ENOMEM; |
| 1316 | } |
| 1317 | |
| 1318 | /* |
| 1319 | * COMMIT call returned |
| 1320 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1321 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 1323 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1325 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | task->tk_pid, task->tk_status); |
| 1327 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1328 | /* Call the NFS version-specific code */ |
| 1329 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) |
| 1330 | return; |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1331 | } |
| 1332 | |
| 1333 | static void nfs_commit_release(void *calldata) |
| 1334 | { |
| 1335 | struct nfs_write_data *data = calldata; |
| 1336 | struct nfs_page *req; |
| 1337 | int status = data->task.tk_status; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | while (!list_empty(&data->pages)) { |
| 1340 | req = nfs_list_entry(data->pages.next); |
| 1341 | nfs_list_remove_request(req); |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 1342 | nfs_clear_request_commit(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1344 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1345 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1346 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | req->wb_bytes, |
| 1348 | (long long)req_offset(req)); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1349 | if (status < 0) { |
| 1350 | nfs_context_set_write_error(req->wb_context, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | nfs_inode_remove_request(req); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1352 | dprintk(", error = %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | goto next; |
| 1354 | } |
| 1355 | |
| 1356 | /* Okay, COMMIT succeeded, apparently. Check the verifier |
| 1357 | * returned by the server against all stored verfs. */ |
| 1358 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { |
| 1359 | /* We have a match */ |
| 1360 | nfs_inode_remove_request(req); |
| 1361 | dprintk(" OK\n"); |
| 1362 | goto next; |
| 1363 | } |
| 1364 | /* We have a mismatch. Write the page again */ |
| 1365 | dprintk(" mismatch\n"); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 1366 | nfs_mark_request_dirty(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1368 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | } |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1370 | nfs_commit_clear_lock(NFS_I(data->inode)); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1371 | nfs_commitdata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1373 | |
| 1374 | static const struct rpc_call_ops nfs_commit_ops = { |
Andy Adamson | 21d9a85 | 2009-04-01 09:22:27 -0400 | [diff] [blame] | 1375 | #if defined(CONFIG_NFS_V4_1) |
| 1376 | .rpc_call_prepare = nfs_write_prepare, |
| 1377 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1378 | .rpc_call_done = nfs_commit_done, |
| 1379 | .rpc_release = nfs_commit_release, |
| 1380 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1382 | static int nfs_commit_inode(struct inode *inode, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | LIST_HEAD(head); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1385 | int may_wait = how & FLUSH_SYNC; |
| 1386 | int res = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1388 | if (!nfs_commit_set_lock(NFS_I(inode), may_wait)) |
| 1389 | goto out; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1390 | spin_lock(&inode->i_lock); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1391 | res = nfs_scan_commit(inode, &head, 0, 0); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1392 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | if (res) { |
Trond Myklebust | 7d46a49 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 1394 | int error = nfs_commit_list(inode, &head, how); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1395 | if (error < 0) |
| 1396 | return error; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1397 | if (may_wait) |
| 1398 | wait_on_bit(&NFS_I(inode)->flags, NFS_INO_COMMIT, |
| 1399 | nfs_wait_bit_killable, |
| 1400 | TASK_KILLABLE); |
| 1401 | } else |
| 1402 | nfs_commit_clear_lock(NFS_I(inode)); |
| 1403 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | return res; |
| 1405 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1406 | |
| 1407 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1408 | { |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1409 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1410 | int flags = FLUSH_SYNC; |
| 1411 | int ret = 0; |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1412 | |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1413 | /* Don't commit yet if this is a non-blocking flush and there are |
| 1414 | * lots of outstanding writes for this mapping. |
| 1415 | */ |
| 1416 | if (wbc->sync_mode == WB_SYNC_NONE && |
| 1417 | nfsi->ncommit <= (nfsi->npages >> 1)) |
| 1418 | goto out_mark_dirty; |
| 1419 | |
Trond Myklebust | 5bad5ab | 2010-02-19 17:02:24 -0800 | [diff] [blame] | 1420 | if (wbc->nonblocking || wbc->for_background) |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1421 | flags = 0; |
| 1422 | ret = nfs_commit_inode(inode, flags); |
| 1423 | if (ret >= 0) { |
| 1424 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 1425 | if (ret < wbc->nr_to_write) |
| 1426 | wbc->nr_to_write -= ret; |
| 1427 | else |
| 1428 | wbc->nr_to_write = 0; |
| 1429 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1430 | return 0; |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1431 | } |
| 1432 | out_mark_dirty: |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1433 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
| 1434 | return ret; |
| 1435 | } |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1436 | #else |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1437 | static int nfs_commit_inode(struct inode *inode, int how) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1438 | { |
| 1439 | return 0; |
| 1440 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1441 | |
| 1442 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1443 | { |
| 1444 | return 0; |
| 1445 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | #endif |
| 1447 | |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1448 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 1449 | { |
| 1450 | return nfs_commit_unstable_pages(inode, wbc); |
| 1451 | } |
| 1452 | |
Trond Myklebust | acdc53b | 2010-02-19 17:03:26 -0800 | [diff] [blame] | 1453 | /* |
| 1454 | * flush the inode to disk. |
| 1455 | */ |
| 1456 | int nfs_wb_all(struct inode *inode) |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1457 | { |
| 1458 | struct writeback_control wbc = { |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 1459 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1460 | .nr_to_write = LONG_MAX, |
Trond Myklebust | d7fb120 | 2008-10-06 20:08:56 -0400 | [diff] [blame] | 1461 | .range_start = 0, |
| 1462 | .range_end = LLONG_MAX, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1463 | }; |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1464 | |
Trond Myklebust | acdc53b | 2010-02-19 17:03:26 -0800 | [diff] [blame] | 1465 | return sync_inode(inode, &wbc); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1466 | } |
| 1467 | |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1468 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
| 1469 | { |
| 1470 | struct nfs_page *req; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1471 | int ret = 0; |
| 1472 | |
| 1473 | BUG_ON(!PageLocked(page)); |
| 1474 | for (;;) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1475 | wait_on_page_writeback(page); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1476 | req = nfs_page_find_request(page); |
| 1477 | if (req == NULL) |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1478 | break; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1479 | if (nfs_lock_request_dontget(req)) { |
| 1480 | nfs_inode_remove_request(req); |
| 1481 | /* |
| 1482 | * In case nfs_inode_remove_request has marked the |
| 1483 | * page as being dirty |
| 1484 | */ |
| 1485 | cancel_dirty_page(page, PAGE_CACHE_SIZE); |
| 1486 | nfs_unlock_request(req); |
| 1487 | break; |
| 1488 | } |
| 1489 | ret = nfs_wait_on_request(req); |
Trond Myklebust | c9edda7 | 2010-01-26 15:41:34 -0500 | [diff] [blame] | 1490 | nfs_release_request(req); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1491 | if (ret < 0) |
Trond Myklebust | c988950 | 2010-02-19 17:03:21 -0800 | [diff] [blame] | 1492 | break; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1493 | } |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1494 | return ret; |
| 1495 | } |
| 1496 | |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1497 | /* |
| 1498 | * Write back all requests on one page - we do this before reading it. |
| 1499 | */ |
| 1500 | int nfs_wb_page(struct inode *inode, struct page *page) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1501 | { |
| 1502 | loff_t range_start = page_offset(page); |
| 1503 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1504 | struct writeback_control wbc = { |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1505 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1506 | .nr_to_write = 0, |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1507 | .range_start = range_start, |
| 1508 | .range_end = range_end, |
| 1509 | }; |
| 1510 | int ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1511 | |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1512 | while(PagePrivate(page)) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1513 | wait_on_page_writeback(page); |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1514 | if (clear_page_dirty_for_io(page)) { |
| 1515 | ret = nfs_writepage_locked(page, &wbc); |
| 1516 | if (ret < 0) |
| 1517 | goto out_error; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1518 | } |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1519 | ret = sync_inode(inode, &wbc); |
| 1520 | if (ret < 0) |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1521 | goto out_error; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1522 | } |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1523 | return 0; |
| 1524 | out_error: |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1525 | return ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1526 | } |
| 1527 | |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1528 | #ifdef CONFIG_MIGRATION |
| 1529 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, |
| 1530 | struct page *page) |
| 1531 | { |
| 1532 | struct nfs_page *req; |
| 1533 | int ret; |
| 1534 | |
Trond Myklebust | 7549ad5 | 2010-02-08 09:32:34 -0500 | [diff] [blame] | 1535 | nfs_fscache_release_page(page, GFP_KERNEL); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1536 | |
| 1537 | req = nfs_find_and_lock_request(page); |
| 1538 | ret = PTR_ERR(req); |
| 1539 | if (IS_ERR(req)) |
| 1540 | goto out; |
| 1541 | |
| 1542 | ret = migrate_page(mapping, newpage, page); |
| 1543 | if (!req) |
| 1544 | goto out; |
| 1545 | if (ret) |
| 1546 | goto out_unlock; |
| 1547 | page_cache_get(newpage); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1548 | spin_lock(&mapping->host->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1549 | req->wb_page = newpage; |
| 1550 | SetPagePrivate(newpage); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1551 | set_page_private(newpage, (unsigned long)req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1552 | ClearPagePrivate(page); |
| 1553 | set_page_private(page, 0); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1554 | spin_unlock(&mapping->host->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1555 | page_cache_release(page); |
| 1556 | out_unlock: |
| 1557 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1558 | out: |
| 1559 | return ret; |
| 1560 | } |
| 1561 | #endif |
| 1562 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 1563 | int __init nfs_init_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | { |
| 1565 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", |
| 1566 | sizeof(struct nfs_write_data), |
| 1567 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1568 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | if (nfs_wdata_cachep == NULL) |
| 1570 | return -ENOMEM; |
| 1571 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1572 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
| 1573 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | if (nfs_wdata_mempool == NULL) |
| 1575 | return -ENOMEM; |
| 1576 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1577 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
| 1578 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | if (nfs_commit_mempool == NULL) |
| 1580 | return -ENOMEM; |
| 1581 | |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 1582 | /* |
| 1583 | * NFS congestion size, scale with available memory. |
| 1584 | * |
| 1585 | * 64MB: 8192k |
| 1586 | * 128MB: 11585k |
| 1587 | * 256MB: 16384k |
| 1588 | * 512MB: 23170k |
| 1589 | * 1GB: 32768k |
| 1590 | * 2GB: 46340k |
| 1591 | * 4GB: 65536k |
| 1592 | * 8GB: 92681k |
| 1593 | * 16GB: 131072k |
| 1594 | * |
| 1595 | * This allows larger machines to have larger/more transfers. |
| 1596 | * Limit the default to 256M |
| 1597 | */ |
| 1598 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); |
| 1599 | if (nfs_congestion_kb > 256*1024) |
| 1600 | nfs_congestion_kb = 256*1024; |
| 1601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | return 0; |
| 1603 | } |
| 1604 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 1605 | void nfs_destroy_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | { |
| 1607 | mempool_destroy(nfs_commit_mempool); |
| 1608 | mempool_destroy(nfs_wdata_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1609 | kmem_cache_destroy(nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | } |
| 1611 | |