Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/write.c |
| 3 | * |
Trond Myklebust | 7c85d90 | 2006-12-13 15:23:48 -0500 | [diff] [blame] | 4 | * Write file data over NFS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/types.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/pagemap.h> |
| 13 | #include <linux/file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/writeback.h> |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 15 | #include <linux/swap.h> |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 16 | #include <linux/migrate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include <linux/sunrpc/clnt.h> |
| 19 | #include <linux/nfs_fs.h> |
| 20 | #include <linux/nfs_mount.h> |
| 21 | #include <linux/nfs_page.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 22 | #include <linux/backing-dev.h> |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include "delegation.h" |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 27 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 28 | #include "iostat.h" |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 29 | #include "nfs4_fs.h" |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 30 | #include "fscache.h" |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 31 | #include "pnfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
| 34 | |
| 35 | #define MIN_POOL_WRITE (32) |
| 36 | #define MIN_POOL_COMMIT (4) |
| 37 | |
| 38 | /* |
| 39 | * Local function declarations |
| 40 | */ |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 41 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
| 42 | struct inode *inode, int ioflags); |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 43 | static void nfs_redirty_request(struct nfs_page *req); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 44 | static const struct rpc_call_ops nfs_write_partial_ops; |
| 45 | static const struct rpc_call_ops nfs_write_full_ops; |
| 46 | static const struct rpc_call_ops nfs_commit_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 48 | static struct kmem_cache *nfs_wdata_cachep; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 49 | static mempool_t *nfs_wdata_mempool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | static mempool_t *nfs_commit_mempool; |
| 51 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 52 | struct nfs_write_data *nfs_commitdata_alloc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | { |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 54 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | if (p) { |
| 57 | memset(p, 0, sizeof(*p)); |
| 58 | INIT_LIST_HEAD(&p->pages); |
| 59 | } |
| 60 | return p; |
| 61 | } |
| 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; |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 78 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
| 79 | p->pagevec = p->page_array; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 80 | else { |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 81 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
| 82 | if (!p->pagevec) { |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 83 | mempool_free(p, nfs_wdata_mempool); |
| 84 | p = NULL; |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | return p; |
| 89 | } |
| 90 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 91 | void nfs_writedata_free(struct nfs_write_data *p) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 92 | { |
| 93 | if (p && (p->pagevec != &p->page_array[0])) |
| 94 | kfree(p->pagevec); |
| 95 | mempool_free(p, nfs_wdata_mempool); |
| 96 | } |
| 97 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 98 | static void nfs_writedata_release(struct nfs_write_data *wdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
Fred Isaman | 5053aa5 | 2011-03-03 15:13:43 +0000 | [diff] [blame] | 100 | put_lseg(wdata->lseg); |
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) |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 182 | return FLUSH_LOWPRI | FLUSH_COND_STABLE; |
| 183 | return FLUSH_COND_STABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 225 | static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 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 | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 244 | if (!nonblock) |
| 245 | ret = nfs_wait_on_request(req); |
| 246 | else |
| 247 | ret = -EAGAIN; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 248 | nfs_release_request(req); |
| 249 | if (ret != 0) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 250 | return ERR_PTR(ret); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 251 | spin_lock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 252 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 253 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 254 | return req; |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | * Find an associated nfs write request, and prepare to flush it out |
| 259 | * May return an error if the user signalled nfs_wait_on_request(). |
| 260 | */ |
| 261 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 262 | struct page *page, bool nonblock) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 263 | { |
| 264 | struct nfs_page *req; |
| 265 | int ret = 0; |
| 266 | |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 267 | req = nfs_find_and_lock_request(page, nonblock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 268 | if (!req) |
| 269 | goto out; |
| 270 | ret = PTR_ERR(req); |
| 271 | if (IS_ERR(req)) |
| 272 | goto out; |
| 273 | |
| 274 | ret = nfs_set_page_writeback(page); |
| 275 | BUG_ON(ret != 0); |
| 276 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); |
| 277 | |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 278 | if (!nfs_pageio_add_request(pgio, req)) { |
| 279 | nfs_redirty_request(req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 280 | ret = pgio->pg_error; |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 281 | } |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 282 | out: |
| 283 | return ret; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 284 | } |
| 285 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 286 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
| 287 | { |
| 288 | struct inode *inode = page->mapping->host; |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 289 | int ret; |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 290 | |
| 291 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
| 292 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); |
| 293 | |
| 294 | nfs_pageio_cond_complete(pgio, page->index); |
Wu Fengguang | 1b430be | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 295 | ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 296 | if (ret == -EAGAIN) { |
| 297 | redirty_page_for_writepage(wbc, page); |
| 298 | ret = 0; |
| 299 | } |
| 300 | return ret; |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 301 | } |
| 302 | |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 303 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | * Write an mmapped page to the server. |
| 305 | */ |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 306 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 308 | struct nfs_pageio_descriptor pgio; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 309 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 311 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
| 312 | err = nfs_do_writepage(page, wbc, &pgio); |
| 313 | nfs_pageio_complete(&pgio); |
| 314 | if (err < 0) |
| 315 | return err; |
| 316 | if (pgio.pg_error < 0) |
| 317 | return pgio.pg_error; |
| 318 | return 0; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | int nfs_writepage(struct page *page, struct writeback_control *wbc) |
| 322 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 323 | int ret; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 324 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 325 | ret = nfs_writepage_locked(page, wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | unlock_page(page); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 327 | return ret; |
| 328 | } |
| 329 | |
| 330 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) |
| 331 | { |
| 332 | int ret; |
| 333 | |
| 334 | ret = nfs_do_writepage(page, wbc, data); |
| 335 | unlock_page(page); |
| 336 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
| 340 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | struct inode *inode = mapping->host; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 342 | unsigned long *bitlock = &NFS_I(inode)->flags; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 343 | struct nfs_pageio_descriptor pgio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | int err; |
| 345 | |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 346 | /* Stop dirtying of new pages while we sync */ |
| 347 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, |
| 348 | nfs_wait_bit_killable, TASK_KILLABLE); |
| 349 | if (err) |
| 350 | goto out_err; |
| 351 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 352 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
| 353 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 354 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 355 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 356 | nfs_pageio_complete(&pgio); |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 357 | |
| 358 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); |
| 359 | smp_mb__after_clear_bit(); |
| 360 | wake_up_bit(bitlock, NFS_INO_FLUSHING); |
| 361 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 362 | if (err < 0) |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 363 | goto out_err; |
| 364 | err = pgio.pg_error; |
| 365 | if (err < 0) |
| 366 | goto out_err; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 367 | return 0; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 368 | out_err: |
| 369 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Insert a write request into an inode |
| 374 | */ |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 375 | 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] | 376 | { |
| 377 | struct nfs_inode *nfsi = NFS_I(inode); |
| 378 | int error; |
| 379 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 380 | error = radix_tree_preload(GFP_NOFS); |
| 381 | if (error != 0) |
| 382 | goto out; |
| 383 | |
| 384 | /* Lock the request! */ |
| 385 | nfs_lock_request_dontget(req); |
| 386 | |
| 387 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
Nick Piggin | 2785259 | 2008-02-04 23:48:37 -0800 | [diff] [blame] | 389 | BUG_ON(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | if (!nfsi->npages) { |
| 391 | igrab(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
| 393 | nfsi->change_attr++; |
| 394 | } |
Trond Myklebust | 2df485a | 2010-12-07 22:39:17 -0500 | [diff] [blame] | 395 | set_bit(PG_MAPPED, &req->wb_flags); |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 396 | SetPagePrivate(req->wb_page); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 397 | set_page_private(req->wb_page, (unsigned long)req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | nfsi->npages++; |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 399 | kref_get(&req->wb_kref); |
Nick Piggin | 2785259 | 2008-02-04 23:48:37 -0800 | [diff] [blame] | 400 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
| 401 | NFS_PAGE_TAG_LOCKED); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 402 | spin_unlock(&inode->i_lock); |
| 403 | radix_tree_preload_end(); |
| 404 | out: |
| 405 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 409 | * Remove a write request from an inode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | */ |
| 411 | static void nfs_inode_remove_request(struct nfs_page *req) |
| 412 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 413 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | struct nfs_inode *nfsi = NFS_I(inode); |
| 415 | |
| 416 | BUG_ON (!NFS_WBACK_BUSY(req)); |
| 417 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 418 | spin_lock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 419 | set_page_private(req->wb_page, 0); |
Trond Myklebust | deb7d63 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 420 | ClearPagePrivate(req->wb_page); |
Trond Myklebust | 2df485a | 2010-12-07 22:39:17 -0500 | [diff] [blame] | 421 | clear_bit(PG_MAPPED, &req->wb_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
| 423 | nfsi->npages--; |
| 424 | if (!nfsi->npages) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 425 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | iput(inode); |
| 427 | } else |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 428 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | nfs_release_request(req); |
| 430 | } |
| 431 | |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 432 | static void |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 433 | nfs_mark_request_dirty(struct nfs_page *req) |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 434 | { |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 435 | __set_page_dirty_nobuffers(req->wb_page); |
Trond Myklebust | b80c3cb | 2010-04-09 19:07:07 -0400 | [diff] [blame] | 436 | __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC); |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 437 | } |
| 438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 440 | /* |
| 441 | * Add a request to the inode's commit list. |
| 442 | */ |
| 443 | static void |
| 444 | nfs_mark_request_commit(struct nfs_page *req) |
| 445 | { |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 446 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | struct nfs_inode *nfsi = NFS_I(inode); |
| 448 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 449 | spin_lock(&inode->i_lock); |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 450 | set_bit(PG_CLEAN, &(req)->wb_flags); |
Trond Myklebust | 5c36968 | 2007-06-17 15:27:42 -0400 | [diff] [blame] | 451 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
| 452 | req->wb_index, |
| 453 | NFS_PAGE_TAG_COMMIT); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 454 | nfsi->ncommit++; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 455 | spin_unlock(&inode->i_lock); |
Christoph Lameter | fd39fc8 | 2006-06-30 01:55:40 -0700 | [diff] [blame] | 456 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 457 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
Trond Myklebust | a180304 | 2006-12-05 00:45:19 -0500 | [diff] [blame] | 458 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 460 | |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 461 | static int |
| 462 | nfs_clear_request_commit(struct nfs_page *req) |
| 463 | { |
| 464 | struct page *page = req->wb_page; |
| 465 | |
| 466 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { |
| 467 | dec_zone_page_state(page, NR_UNSTABLE_NFS); |
| 468 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
| 469 | return 1; |
| 470 | } |
| 471 | return 0; |
| 472 | } |
| 473 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 474 | static inline |
| 475 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 476 | { |
Fred Isaman | 465d524 | 2011-03-23 13:27:44 +0000 | [diff] [blame] | 477 | if (data->verf.committed == NFS_DATA_SYNC) |
| 478 | return data->lseg == NULL; |
| 479 | else |
| 480 | return data->verf.committed != NFS_FILE_SYNC; |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | static inline |
| 484 | int nfs_reschedule_unstable_write(struct nfs_page *req) |
| 485 | { |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 486 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 487 | nfs_mark_request_commit(req); |
| 488 | return 1; |
| 489 | } |
| 490 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 491 | nfs_mark_request_dirty(req); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 492 | return 1; |
| 493 | } |
| 494 | return 0; |
| 495 | } |
| 496 | #else |
| 497 | static inline void |
| 498 | nfs_mark_request_commit(struct nfs_page *req) |
| 499 | { |
| 500 | } |
| 501 | |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 502 | static inline int |
| 503 | nfs_clear_request_commit(struct nfs_page *req) |
| 504 | { |
| 505 | return 0; |
| 506 | } |
| 507 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 508 | static inline |
| 509 | int nfs_write_need_commit(struct nfs_write_data *data) |
| 510 | { |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | static inline |
| 515 | int nfs_reschedule_unstable_write(struct nfs_page *req) |
| 516 | { |
| 517 | return 0; |
| 518 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | #endif |
| 520 | |
Trond Myklebust | 47c6256 | 2009-03-16 08:13:41 -0400 | [diff] [blame] | 521 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 522 | static int |
| 523 | nfs_need_commit(struct nfs_inode *nfsi) |
| 524 | { |
| 525 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); |
| 526 | } |
| 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | /* |
| 529 | * nfs_scan_commit - Scan an inode for commit requests |
| 530 | * @inode: NFS inode to scan |
| 531 | * @dst: destination list |
| 532 | * @idx_start: lower bound of page->index to scan. |
| 533 | * @npages: idx_start + npages sets the upper bound to scan. |
| 534 | * |
| 535 | * Moves requests from the inode's 'commit' request list. |
| 536 | * The requests are *not* checked to ensure that they form a contiguous set. |
| 537 | */ |
| 538 | static int |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 539 | 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] | 540 | { |
| 541 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 542 | int ret; |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 543 | |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 544 | if (!nfs_need_commit(nfsi)) |
| 545 | return 0; |
| 546 | |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 547 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
| 548 | if (ret > 0) |
| 549 | nfsi->ncommit -= ret; |
Trond Myklebust | 2928db1 | 2010-02-19 17:03:18 -0800 | [diff] [blame] | 550 | if (nfs_need_commit(NFS_I(inode))) |
| 551 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 552 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | } |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 554 | #else |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 555 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
| 556 | { |
| 557 | return 0; |
| 558 | } |
| 559 | |
Trond Myklebust | ca52fec | 2007-04-17 17:22:13 -0400 | [diff] [blame] | 560 | 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] | 561 | { |
| 562 | return 0; |
| 563 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | #endif |
| 565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | /* |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 567 | * Search for an existing write request, and attempt to update |
| 568 | * it to reflect a new dirty region on a given page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | * |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 570 | * If the attempt fails, then the existing request is flushed out |
| 571 | * to disk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | */ |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 573 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
| 574 | struct page *page, |
| 575 | unsigned int offset, |
| 576 | unsigned int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 578 | struct nfs_page *req; |
| 579 | unsigned int rqend; |
| 580 | unsigned int end; |
| 581 | int error; |
| 582 | |
| 583 | if (!PagePrivate(page)) |
| 584 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | end = offset + bytes; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 587 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | for (;;) { |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 590 | req = nfs_page_find_request_locked(page); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 591 | if (req == NULL) |
| 592 | goto out_unlock; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 593 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 594 | rqend = req->wb_offset + req->wb_bytes; |
| 595 | /* |
| 596 | * Tell the caller to flush out the request if |
| 597 | * the offsets are non-contiguous. |
| 598 | * Note: nfs_flush_incompatible() will already |
| 599 | * have flushed out requests having wrong owners. |
| 600 | */ |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 601 | if (offset > rqend |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 602 | || end < req->wb_offset) |
| 603 | goto out_flushme; |
| 604 | |
| 605 | if (nfs_set_page_tag_locked(req)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 608 | /* The request is locked, so wait and then retry */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 609 | spin_unlock(&inode->i_lock); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 610 | error = nfs_wait_on_request(req); |
| 611 | nfs_release_request(req); |
| 612 | if (error != 0) |
| 613 | goto out_err; |
| 614 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |
| 616 | |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 617 | if (nfs_clear_request_commit(req) && |
| 618 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, |
| 619 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) |
| 620 | NFS_I(inode)->ncommit--; |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | /* Okay, the request matches. Update the region */ |
| 623 | if (offset < req->wb_offset) { |
| 624 | req->wb_offset = offset; |
| 625 | req->wb_pgbase = offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | if (end > rqend) |
| 628 | req->wb_bytes = end - req->wb_offset; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 629 | else |
| 630 | req->wb_bytes = rqend - req->wb_offset; |
| 631 | out_unlock: |
| 632 | spin_unlock(&inode->i_lock); |
| 633 | return req; |
| 634 | out_flushme: |
| 635 | spin_unlock(&inode->i_lock); |
| 636 | nfs_release_request(req); |
| 637 | error = nfs_wb_page(inode, page); |
| 638 | out_err: |
| 639 | return ERR_PTR(error); |
| 640 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 642 | /* |
| 643 | * Try to update an existing write request, or create one if there is none. |
| 644 | * |
| 645 | * Note: Should always be called with the Page Lock held to prevent races |
| 646 | * if we have to add a new request. Also assumes that the caller has |
| 647 | * already called nfs_flush_incompatible() if necessary. |
| 648 | */ |
| 649 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, |
| 650 | struct page *page, unsigned int offset, unsigned int bytes) |
| 651 | { |
| 652 | struct inode *inode = page->mapping->host; |
| 653 | struct nfs_page *req; |
| 654 | int error; |
| 655 | |
| 656 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
| 657 | if (req != NULL) |
| 658 | goto out; |
| 659 | req = nfs_create_request(ctx, inode, page, offset, bytes); |
| 660 | if (IS_ERR(req)) |
| 661 | goto out; |
| 662 | error = nfs_inode_add_request(inode, req); |
| 663 | if (error != 0) { |
| 664 | nfs_release_request(req); |
| 665 | req = ERR_PTR(error); |
| 666 | } |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 667 | out: |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 668 | return req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 671 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
| 672 | unsigned int offset, unsigned int count) |
| 673 | { |
| 674 | struct nfs_page *req; |
| 675 | |
| 676 | req = nfs_setup_write_request(ctx, page, offset, count); |
| 677 | if (IS_ERR(req)) |
| 678 | return PTR_ERR(req); |
Trond Myklebust | b80c3cb | 2010-04-09 19:07:07 -0400 | [diff] [blame] | 679 | nfs_mark_request_dirty(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 680 | /* Update file length */ |
| 681 | nfs_grow_file(page, offset, count); |
| 682 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 683 | nfs_mark_request_dirty(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 684 | nfs_clear_page_tag_locked(req); |
| 685 | return 0; |
| 686 | } |
| 687 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | int nfs_flush_incompatible(struct file *file, struct page *page) |
| 689 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 690 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | struct nfs_page *req; |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 692 | int do_flush, status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | /* |
| 694 | * Look for a request corresponding to this page. If there |
| 695 | * is one, and it belongs to another file, we flush it out |
| 696 | * before we try to copy anything into the page. Do this |
| 697 | * due to the lack of an ACCESS-type call in NFSv2. |
| 698 | * Also do the same if we find a request from an existing |
| 699 | * dropped page. |
| 700 | */ |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 701 | do { |
| 702 | req = nfs_page_find_request(page); |
| 703 | if (req == NULL) |
| 704 | return 0; |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 705 | do_flush = req->wb_page != page || req->wb_context != ctx || |
| 706 | req->wb_lock_context->lockowner != current->files || |
| 707 | req->wb_lock_context->pid != current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | nfs_release_request(req); |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 709 | if (!do_flush) |
| 710 | return 0; |
| 711 | status = nfs_wb_page(page->mapping->host, page); |
| 712 | } while (status == 0); |
| 713 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | /* |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 717 | * If the page cache is marked as unsafe or invalid, then we can't rely on |
| 718 | * the PageUptodate() flag. In this case, we will need to turn off |
| 719 | * write optimisations that depend on the page contents being correct. |
| 720 | */ |
| 721 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) |
| 722 | { |
| 723 | return PageUptodate(page) && |
| 724 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); |
| 725 | } |
| 726 | |
| 727 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | * Update and possibly write a cached page of an NFS file. |
| 729 | * |
| 730 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad |
| 731 | * things with a page scheduled for an RPC call (e.g. invalidate it). |
| 732 | */ |
| 733 | int nfs_updatepage(struct file *file, struct page *page, |
| 734 | unsigned int offset, unsigned int count) |
| 735 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 736 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | struct inode *inode = page->mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | int status = 0; |
| 739 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 740 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
| 741 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 742 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 743 | file->f_path.dentry->d_parent->d_name.name, |
| 744 | file->f_path.dentry->d_name.name, count, |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 745 | (long long)(page_offset(page) + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | /* 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] | 748 | * is up to date, it may be more efficient to extend the write |
| 749 | * to cover the entire page in order to avoid fragmentation |
| 750 | * inefficiencies. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | */ |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 752 | if (nfs_write_pageuptodate(page, inode) && |
| 753 | inode->i_flock == NULL && |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 754 | !(file->f_flags & O_DSYNC)) { |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 755 | count = max(count + offset, nfs_page_length(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | } |
| 758 | |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 759 | status = nfs_writepage_setup(ctx, page, offset, count); |
Trond Myklebust | 03fa9e8 | 2008-06-05 16:02:35 -0400 | [diff] [blame] | 760 | if (status < 0) |
| 761 | nfs_set_pageerror(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 763 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | status, (long long)i_size_read(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | return status; |
| 766 | } |
| 767 | |
| 768 | static void nfs_writepage_release(struct nfs_page *req) |
| 769 | { |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 770 | struct page *page = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 772 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 773 | nfs_inode_remove_request(req); |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 774 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 775 | nfs_end_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
| 777 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 778 | static int flush_task_priority(int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | { |
| 780 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { |
| 781 | case FLUSH_HIGHPRI: |
| 782 | return RPC_PRIORITY_HIGH; |
| 783 | case FLUSH_LOWPRI: |
| 784 | return RPC_PRIORITY_LOW; |
| 785 | } |
| 786 | return RPC_PRIORITY_NORMAL; |
| 787 | } |
| 788 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 789 | int nfs_initiate_write(struct nfs_write_data *data, |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 790 | struct rpc_clnt *clnt, |
| 791 | const struct rpc_call_ops *call_ops, |
| 792 | int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | { |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 794 | struct inode *inode = data->inode; |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 795 | int priority = flush_task_priority(how); |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 796 | struct rpc_task *task; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 797 | struct rpc_message msg = { |
| 798 | .rpc_argp = &data->args, |
| 799 | .rpc_resp = &data->res, |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 800 | .rpc_cred = data->cred, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 801 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 802 | struct rpc_task_setup task_setup_data = { |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 803 | .rpc_client = clnt, |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 804 | .task = &data->task, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 805 | .rpc_message = &msg, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 806 | .callback_ops = call_ops, |
| 807 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 808 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 809 | .flags = RPC_TASK_ASYNC, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 810 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 811 | }; |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 812 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 814 | /* Set up the initial task struct. */ |
| 815 | NFS_PROTO(inode)->write_setup(data, &msg); |
| 816 | |
| 817 | dprintk("NFS: %5u initiated write call " |
| 818 | "(req %s/%lld, %u bytes @ offset %llu)\n", |
| 819 | data->task.tk_pid, |
| 820 | inode->i_sb->s_id, |
| 821 | (long long)NFS_FILEID(inode), |
| 822 | data->args.count, |
| 823 | (unsigned long long)data->args.offset); |
| 824 | |
| 825 | task = rpc_run_task(&task_setup_data); |
| 826 | if (IS_ERR(task)) { |
| 827 | ret = PTR_ERR(task); |
| 828 | goto out; |
| 829 | } |
| 830 | if (how & FLUSH_SYNC) { |
| 831 | ret = rpc_wait_for_completion_task(task); |
| 832 | if (ret == 0) |
| 833 | ret = task->tk_status; |
| 834 | } |
| 835 | rpc_put_task(task); |
| 836 | out: |
| 837 | return ret; |
| 838 | } |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 839 | EXPORT_SYMBOL_GPL(nfs_initiate_write); |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 840 | |
| 841 | /* |
| 842 | * Set up the argument/result storage required for the RPC call. |
| 843 | */ |
| 844 | static int nfs_write_rpcsetup(struct nfs_page *req, |
| 845 | struct nfs_write_data *data, |
| 846 | const struct rpc_call_ops *call_ops, |
| 847 | unsigned int count, unsigned int offset, |
Fred Isaman | 5053aa5 | 2011-03-03 15:13:43 +0000 | [diff] [blame] | 848 | struct pnfs_layout_segment *lseg, |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 849 | int how) |
| 850 | { |
| 851 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
| 852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | /* Set up the RPC argument and reply structs |
| 854 | * NB: take care not to mess about with data->commit et al. */ |
| 855 | |
| 856 | data->req = req; |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 857 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 858 | data->cred = req->wb_context->cred; |
Fred Isaman | 5053aa5 | 2011-03-03 15:13:43 +0000 | [diff] [blame] | 859 | data->lseg = get_lseg(lseg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
| 861 | data->args.fh = NFS_FH(inode); |
| 862 | data->args.offset = req_offset(req) + offset; |
| 863 | data->args.pgbase = req->wb_pgbase + offset; |
| 864 | data->args.pages = data->pagevec; |
| 865 | data->args.count = count; |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 866 | data->args.context = get_nfs_open_context(req->wb_context); |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 867 | data->args.lock_context = req->wb_lock_context; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 868 | data->args.stable = NFS_UNSTABLE; |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 869 | if (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 870 | data->args.stable = NFS_DATA_SYNC; |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 871 | if (!nfs_need_commit(NFS_I(inode))) |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 872 | data->args.stable = NFS_FILE_SYNC; |
| 873 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
| 875 | data->res.fattr = &data->fattr; |
| 876 | data->res.count = count; |
| 877 | data->res.verf = &data->verf; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 878 | nfs_fattr_init(&data->fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
Andy Adamson | 0382b74 | 2011-03-03 15:13:45 +0000 | [diff] [blame] | 880 | if (data->lseg && |
| 881 | (pnfs_try_to_write_data(data, call_ops, how) == PNFS_ATTEMPTED)) |
| 882 | return 0; |
| 883 | |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 884 | return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | } |
| 886 | |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 887 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
| 888 | * call this on each, which will prepare them to be retried on next |
| 889 | * writeback using standard nfs. |
| 890 | */ |
| 891 | static void nfs_redirty_request(struct nfs_page *req) |
| 892 | { |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 893 | struct page *page = req->wb_page; |
| 894 | |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 895 | nfs_mark_request_dirty(req); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 896 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 897 | nfs_end_page_writeback(page); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 898 | } |
| 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | /* |
| 901 | * Generate multiple small requests to write out a single |
| 902 | * contiguous dirty area on one page. |
| 903 | */ |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 904 | static int nfs_flush_multi(struct nfs_pageio_descriptor *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | { |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 906 | struct nfs_page *req = nfs_list_entry(desc->pg_list.next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | struct page *page = req->wb_page; |
| 908 | struct nfs_write_data *data; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 909 | size_t wsize = NFS_SERVER(desc->pg_inode)->wsize, nbytes; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 910 | unsigned int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | int requests = 0; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 912 | int ret = 0; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 913 | struct pnfs_layout_segment *lseg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | LIST_HEAD(list); |
| 915 | |
| 916 | nfs_list_remove_request(req); |
| 917 | |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 918 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
| 919 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit || |
| 920 | desc->pg_count > wsize)) |
| 921 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; |
| 922 | |
| 923 | |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 924 | nbytes = desc->pg_count; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 925 | do { |
| 926 | size_t len = min(nbytes, wsize); |
| 927 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 928 | data = nfs_writedata_alloc(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | if (!data) |
| 930 | goto out_bad; |
| 931 | list_add(&data->pages, &list); |
| 932 | requests++; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 933 | nbytes -= len; |
| 934 | } while (nbytes != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | atomic_set(&req->wb_complete, requests); |
| 936 | |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 937 | BUG_ON(desc->pg_lseg); |
| 938 | lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | ClearPageError(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | offset = 0; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 941 | nbytes = desc->pg_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | do { |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 943 | int ret2; |
| 944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 946 | list_del_init(&data->pages); |
| 947 | |
| 948 | data->pagevec[0] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 950 | if (nbytes < wsize) |
| 951 | wsize = nbytes; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 952 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 953 | wsize, offset, lseg, desc->pg_ioflags); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 954 | if (ret == 0) |
| 955 | ret = ret2; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 956 | offset += wsize; |
| 957 | nbytes -= wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | } while (nbytes != 0); |
| 959 | |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 960 | put_lseg(lseg); |
Fred Isaman | 36fe432 | 2011-03-03 15:13:49 +0000 | [diff] [blame] | 961 | desc->pg_lseg = NULL; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 962 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
| 964 | out_bad: |
| 965 | while (!list_empty(&list)) { |
| 966 | data = list_entry(list.next, struct nfs_write_data, pages); |
| 967 | list_del(&data->pages); |
Fred Isaman | 0da2a4ac | 2011-01-19 14:18:50 -0500 | [diff] [blame] | 968 | nfs_writedata_free(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | } |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 970 | nfs_redirty_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | return -ENOMEM; |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | * Create an RPC task for the given write request and kick it. |
| 976 | * The page must have been locked by the caller. |
| 977 | * |
| 978 | * It may happen that the page we're passed is not marked dirty. |
| 979 | * This is the case if nfs_updatepage detects a conflicting request |
| 980 | * that has been written but not committed. |
| 981 | */ |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 982 | static int nfs_flush_one(struct nfs_pageio_descriptor *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | { |
| 984 | struct nfs_page *req; |
| 985 | struct page **pages; |
| 986 | struct nfs_write_data *data; |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 987 | struct list_head *head = &desc->pg_list; |
| 988 | struct pnfs_layout_segment *lseg = desc->pg_lseg; |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 989 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 991 | data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base, |
| 992 | desc->pg_count)); |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 993 | if (!data) { |
| 994 | while (!list_empty(head)) { |
| 995 | req = nfs_list_entry(head->next); |
| 996 | nfs_list_remove_request(req); |
| 997 | nfs_redirty_request(req); |
| 998 | } |
| 999 | ret = -ENOMEM; |
| 1000 | goto out; |
| 1001 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | pages = data->pagevec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | while (!list_empty(head)) { |
| 1004 | req = nfs_list_entry(head->next); |
| 1005 | nfs_list_remove_request(req); |
| 1006 | nfs_list_add_request(req, &data->pages); |
| 1007 | ClearPageError(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | *pages++ = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | } |
| 1010 | req = nfs_list_entry(data->pages.next); |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1011 | if ((!lseg) && list_is_singular(&data->pages)) |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 1012 | lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 1014 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
| 1015 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit)) |
| 1016 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; |
| 1017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | /* Set up the argument struct */ |
Fred Isaman | c76069b | 2011-03-03 15:13:48 +0000 | [diff] [blame] | 1019 | ret = nfs_write_rpcsetup(req, data, &nfs_write_full_ops, desc->pg_count, 0, lseg, desc->pg_ioflags); |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1020 | out: |
| 1021 | put_lseg(lseg); /* Cleans any gotten in ->pg_test */ |
Fred Isaman | 36fe432 | 2011-03-03 15:13:49 +0000 | [diff] [blame] | 1022 | desc->pg_lseg = NULL; |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1023 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1026 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
| 1027 | struct inode *inode, int ioflags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | { |
Chuck Lever | bf4285e | 2007-12-20 14:54:57 -0500 | [diff] [blame] | 1029 | size_t wsize = NFS_SERVER(inode)->wsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Fred Isaman | 44b8379 | 2011-03-03 15:13:44 +0000 | [diff] [blame] | 1031 | pnfs_pageio_init_write(pgio, inode); |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 1032 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1033 | if (wsize < PAGE_CACHE_SIZE) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1034 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1035 | else |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1036 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * Handle a write reply that flushed part of a page. |
| 1041 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1042 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1044 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1046 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
| 1047 | task->tk_pid, |
| 1048 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1049 | (long long) |
| 1050 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), |
| 1051 | data->req->wb_bytes, (long long)req_offset(data->req)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1053 | nfs_writeback_done(task, data); |
| 1054 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1055 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1056 | static void nfs_writeback_release_partial(void *calldata) |
| 1057 | { |
| 1058 | struct nfs_write_data *data = calldata; |
| 1059 | struct nfs_page *req = data->req; |
| 1060 | struct page *page = req->wb_page; |
| 1061 | int status = data->task.tk_status; |
| 1062 | |
| 1063 | if (status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 1064 | nfs_set_pageerror(page); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1065 | nfs_context_set_write_error(req->wb_context, status); |
| 1066 | dprintk(", error = %d\n", status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1067 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | } |
| 1069 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1070 | if (nfs_write_need_commit(data)) { |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1071 | struct inode *inode = page->mapping->host; |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1072 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1073 | spin_lock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1074 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
| 1075 | /* Do nothing we need to resend the writes */ |
| 1076 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
| 1077 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
| 1078 | dprintk(" defer commit\n"); |
| 1079 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { |
| 1080 | set_bit(PG_NEED_RESCHED, &req->wb_flags); |
| 1081 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); |
| 1082 | dprintk(" server reboot detected\n"); |
| 1083 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1084 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1085 | } else |
| 1086 | dprintk(" OK\n"); |
| 1087 | |
| 1088 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | if (atomic_dec_and_test(&req->wb_complete)) |
| 1090 | nfs_writepage_release(req); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1091 | nfs_writedata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | } |
| 1093 | |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1094 | #if defined(CONFIG_NFS_V4_1) |
| 1095 | void nfs_write_prepare(struct rpc_task *task, void *calldata) |
| 1096 | { |
| 1097 | struct nfs_write_data *data = calldata; |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1098 | |
Trond Myklebust | 035168a | 2010-06-16 09:52:26 -0400 | [diff] [blame] | 1099 | if (nfs4_setup_sequence(NFS_SERVER(data->inode), |
| 1100 | &data->args.seq_args, |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1101 | &data->res.seq_res, 1, task)) |
| 1102 | return; |
| 1103 | rpc_call_start(task); |
| 1104 | } |
| 1105 | #endif /* CONFIG_NFS_V4_1 */ |
| 1106 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1107 | static const struct rpc_call_ops nfs_write_partial_ops = { |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1108 | #if defined(CONFIG_NFS_V4_1) |
| 1109 | .rpc_call_prepare = nfs_write_prepare, |
| 1110 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1111 | .rpc_call_done = nfs_writeback_done_partial, |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1112 | .rpc_release = nfs_writeback_release_partial, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1113 | }; |
| 1114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | /* |
| 1116 | * Handle a write reply that flushes a whole page. |
| 1117 | * |
| 1118 | * FIXME: There is an inherent race with invalidate_inode_pages and |
| 1119 | * writebacks since the page->count is kept > 1 for as long |
| 1120 | * as the page has a write request pending. |
| 1121 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1122 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1124 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1126 | nfs_writeback_done(task, data); |
| 1127 | } |
| 1128 | |
| 1129 | static void nfs_writeback_release_full(void *calldata) |
| 1130 | { |
| 1131 | struct nfs_write_data *data = calldata; |
| 1132 | int status = data->task.tk_status; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | /* Update attributes as result of writeback. */ |
| 1135 | while (!list_empty(&data->pages)) { |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1136 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
| 1137 | struct page *page = req->wb_page; |
| 1138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | nfs_list_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1141 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
| 1142 | data->task.tk_pid, |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1143 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1144 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | req->wb_bytes, |
| 1146 | (long long)req_offset(req)); |
| 1147 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1148 | if (status < 0) { |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 1149 | nfs_set_pageerror(page); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1150 | nfs_context_set_write_error(req->wb_context, status); |
| 1151 | dprintk(", error = %d\n", status); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1152 | goto remove_request; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1155 | if (nfs_write_need_commit(data)) { |
| 1156 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); |
| 1157 | nfs_mark_request_commit(req); |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1158 | dprintk(" marked for commit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | goto next; |
| 1160 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 1161 | dprintk(" OK\n"); |
| 1162 | remove_request: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | nfs_inode_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1165 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 1166 | nfs_end_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | } |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1168 | nfs_writedata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | } |
| 1170 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1171 | static const struct rpc_call_ops nfs_write_full_ops = { |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 1172 | #if defined(CONFIG_NFS_V4_1) |
| 1173 | .rpc_call_prepare = nfs_write_prepare, |
| 1174 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1175 | .rpc_call_done = nfs_writeback_done_full, |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1176 | .rpc_release = nfs_writeback_release_full, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1177 | }; |
| 1178 | |
| 1179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | /* |
| 1181 | * This function is called when the WRITE call is complete. |
| 1182 | */ |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1183 | void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | struct nfs_writeargs *argp = &data->args; |
| 1186 | struct nfs_writeres *resp = &data->res; |
Andy Adamson | eedc020 | 2009-04-01 09:22:41 -0400 | [diff] [blame] | 1187 | struct nfs_server *server = NFS_SERVER(data->inode); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1188 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1190 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | task->tk_pid, task->tk_status); |
| 1192 | |
Chuck Lever | f551e44 | 2006-09-20 14:33:04 -0400 | [diff] [blame] | 1193 | /* |
| 1194 | * ->write_done will attempt to use post-op attributes to detect |
| 1195 | * conflicting writes by other clients. A strict interpretation |
| 1196 | * of close-to-open would allow us to continue caching even if |
| 1197 | * another writer had changed the file, but some applications |
| 1198 | * depend on tighter cache coherency when writing. |
| 1199 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1200 | status = NFS_PROTO(data->inode)->write_done(task, data); |
| 1201 | if (status != 0) |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1202 | return; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1203 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
| 1204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 1206 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { |
| 1207 | /* We tried a write call, but the server did not |
| 1208 | * commit data to stable storage even though we |
| 1209 | * requested it. |
| 1210 | * Note: There is a known bug in Tru64 < 5.0 in which |
| 1211 | * the server reports NFS_DATA_SYNC, but performs |
| 1212 | * NFS_FILE_SYNC. We therefore implement this checking |
| 1213 | * as a dprintk() in order to avoid filling syslog. |
| 1214 | */ |
| 1215 | static unsigned long complain; |
| 1216 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 1217 | /* Note this will print the MDS for a DS write */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | if (time_before(complain, jiffies)) { |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1219 | dprintk("NFS: faulty NFS server %s:" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | " (committed = %d) != (stable = %d)\n", |
Andy Adamson | eedc020 | 2009-04-01 09:22:41 -0400 | [diff] [blame] | 1221 | server->nfs_client->cl_hostname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | resp->verf->committed, argp->stable); |
| 1223 | complain = jiffies + 300 * HZ; |
| 1224 | } |
| 1225 | } |
| 1226 | #endif |
| 1227 | /* Is this a short write? */ |
| 1228 | if (task->tk_status >= 0 && resp->count < argp->count) { |
| 1229 | static unsigned long complain; |
| 1230 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1231 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
| 1232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | /* Has the server at least made some progress? */ |
| 1234 | if (resp->count != 0) { |
| 1235 | /* Was this an NFSv2 write or an NFSv3 stable write? */ |
| 1236 | if (resp->verf->committed != NFS_UNSTABLE) { |
| 1237 | /* Resend from where the server left off */ |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 1238 | data->mds_offset += resp->count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | argp->offset += resp->count; |
| 1240 | argp->pgbase += resp->count; |
| 1241 | argp->count -= resp->count; |
| 1242 | } else { |
| 1243 | /* Resend as a stable write in order to avoid |
| 1244 | * headaches in the case of a server crash. |
| 1245 | */ |
| 1246 | argp->stable = NFS_FILE_SYNC; |
| 1247 | } |
Trond Myklebust | 0110ee1 | 2009-12-07 09:00:24 -0500 | [diff] [blame] | 1248 | nfs_restart_rpc(task, server->nfs_client); |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1249 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | } |
| 1251 | if (time_before(complain, jiffies)) { |
| 1252 | printk(KERN_WARNING |
| 1253 | "NFS: Server wrote zero bytes, expected %u.\n", |
| 1254 | argp->count); |
| 1255 | complain = jiffies + 300 * HZ; |
| 1256 | } |
| 1257 | /* Can't do anything about it except throw an error. */ |
| 1258 | task->tk_status = -EIO; |
| 1259 | } |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1260 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | } |
| 1262 | |
| 1263 | |
| 1264 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1265 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
| 1266 | { |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1267 | int ret; |
| 1268 | |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1269 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
| 1270 | return 1; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1271 | if (!may_wait) |
| 1272 | return 0; |
| 1273 | ret = out_of_line_wait_on_bit_lock(&nfsi->flags, |
| 1274 | NFS_INO_COMMIT, |
| 1275 | nfs_wait_bit_killable, |
| 1276 | TASK_KILLABLE); |
| 1277 | return (ret < 0) ? ret : 1; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1278 | } |
| 1279 | |
| 1280 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
| 1281 | { |
| 1282 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); |
| 1283 | smp_mb__after_clear_bit(); |
| 1284 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); |
| 1285 | } |
| 1286 | |
| 1287 | |
H Hartley Sweeten | 0aa0588 | 2010-01-26 15:42:03 -0500 | [diff] [blame] | 1288 | static void nfs_commitdata_release(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | { |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 1290 | struct nfs_write_data *wdata = data; |
| 1291 | |
| 1292 | put_nfs_open_context(wdata->args.context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | nfs_commit_free(wdata); |
| 1294 | } |
| 1295 | |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1296 | static int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt, |
| 1297 | const struct rpc_call_ops *call_ops, |
| 1298 | int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1300 | struct rpc_task *task; |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1301 | int priority = flush_task_priority(how); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1302 | struct rpc_message msg = { |
| 1303 | .rpc_argp = &data->args, |
| 1304 | .rpc_resp = &data->res, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1305 | .rpc_cred = data->cred, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1306 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1307 | struct rpc_task_setup task_setup_data = { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1308 | .task = &data->task, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1309 | .rpc_client = clnt, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1310 | .rpc_message = &msg, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1311 | .callback_ops = call_ops, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1312 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 1313 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | 2c61be0 | 2010-04-09 19:54:50 -0400 | [diff] [blame] | 1314 | .flags = RPC_TASK_ASYNC, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1315 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1316 | }; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1317 | /* Set up the initial task struct. */ |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1318 | NFS_PROTO(data->inode)->commit_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1320 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1321 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1322 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1323 | if (IS_ERR(task)) |
| 1324 | return PTR_ERR(task); |
Jeff Layton | d2224e7 | 2011-03-06 17:14:13 +0000 | [diff] [blame] | 1325 | if (how & FLUSH_SYNC) |
| 1326 | rpc_wait_for_completion_task(task); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1327 | rpc_put_task(task); |
| 1328 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | /* |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1332 | * Set up the argument/result storage required for the RPC call. |
| 1333 | */ |
| 1334 | static void nfs_init_commit(struct nfs_write_data *data, |
| 1335 | struct list_head *head) |
| 1336 | { |
| 1337 | struct nfs_page *first = nfs_list_entry(head->next); |
| 1338 | struct inode *inode = first->wb_context->path.dentry->d_inode; |
| 1339 | |
| 1340 | /* Set up the RPC argument and reply structs |
| 1341 | * NB: take care not to mess about with data->commit et al. */ |
| 1342 | |
| 1343 | list_splice_init(head, &data->pages); |
| 1344 | |
| 1345 | data->inode = inode; |
| 1346 | data->cred = first->wb_context->cred; |
| 1347 | data->mds_ops = &nfs_commit_ops; |
| 1348 | |
| 1349 | data->args.fh = NFS_FH(data->inode); |
| 1350 | /* Note: we always request a commit of the entire inode */ |
| 1351 | data->args.offset = 0; |
| 1352 | data->args.count = 0; |
| 1353 | data->args.context = get_nfs_open_context(first->wb_context); |
| 1354 | data->res.count = 0; |
| 1355 | data->res.fattr = &data->fattr; |
| 1356 | data->res.verf = &data->verf; |
| 1357 | nfs_fattr_init(&data->fattr); |
| 1358 | } |
| 1359 | |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1360 | static void nfs_retry_commit(struct list_head *page_list) |
| 1361 | { |
| 1362 | struct nfs_page *req; |
| 1363 | |
| 1364 | while (!list_empty(page_list)) { |
| 1365 | req = nfs_list_entry(page_list->next); |
| 1366 | nfs_list_remove_request(req); |
| 1367 | nfs_mark_request_commit(req); |
| 1368 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
| 1369 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
| 1370 | BDI_RECLAIMABLE); |
| 1371 | nfs_clear_page_tag_locked(req); |
| 1372 | } |
| 1373 | } |
| 1374 | |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1375 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | * Commit dirty pages |
| 1377 | */ |
| 1378 | static int |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 1379 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | { |
| 1381 | struct nfs_write_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1383 | data = nfs_commitdata_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | |
| 1385 | if (!data) |
| 1386 | goto out_bad; |
| 1387 | |
| 1388 | /* Set up the argument struct */ |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1389 | nfs_init_commit(data, head); |
| 1390 | return nfs_initiate_commit(data, NFS_CLIENT(inode), data->mds_ops, how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | out_bad: |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1392 | nfs_retry_commit(head); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1393 | nfs_commit_clear_lock(NFS_I(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | return -ENOMEM; |
| 1395 | } |
| 1396 | |
| 1397 | /* |
| 1398 | * COMMIT call returned |
| 1399 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1400 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 1402 | struct nfs_write_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1404 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | task->tk_pid, task->tk_status); |
| 1406 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1407 | /* Call the NFS version-specific code */ |
| 1408 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) |
| 1409 | return; |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1410 | } |
| 1411 | |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1412 | static void nfs_commit_release_pages(struct nfs_write_data *data) |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1413 | { |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1414 | struct nfs_page *req; |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1415 | int status = data->task.tk_status; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | while (!list_empty(&data->pages)) { |
| 1418 | req = nfs_list_entry(data->pages.next); |
| 1419 | nfs_list_remove_request(req); |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 1420 | nfs_clear_request_commit(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1422 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 1423 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 1424 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | req->wb_bytes, |
| 1426 | (long long)req_offset(req)); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1427 | if (status < 0) { |
| 1428 | nfs_context_set_write_error(req->wb_context, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | nfs_inode_remove_request(req); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1430 | dprintk(", error = %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | goto next; |
| 1432 | } |
| 1433 | |
| 1434 | /* Okay, COMMIT succeeded, apparently. Check the verifier |
| 1435 | * returned by the server against all stored verfs. */ |
| 1436 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { |
| 1437 | /* We have a match */ |
| 1438 | nfs_inode_remove_request(req); |
| 1439 | dprintk(" OK\n"); |
| 1440 | goto next; |
| 1441 | } |
| 1442 | /* We have a mismatch. Write the page again */ |
| 1443 | dprintk(" mismatch\n"); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 1444 | nfs_mark_request_dirty(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | next: |
Trond Myklebust | 9fd367f | 2007-06-17 15:10:24 -0400 | [diff] [blame] | 1446 | nfs_clear_page_tag_locked(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | } |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1448 | } |
| 1449 | |
| 1450 | static void nfs_commit_release(void *calldata) |
| 1451 | { |
| 1452 | struct nfs_write_data *data = calldata; |
| 1453 | |
| 1454 | nfs_commit_release_pages(data); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1455 | nfs_commit_clear_lock(NFS_I(data->inode)); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1456 | nfs_commitdata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1458 | |
| 1459 | static const struct rpc_call_ops nfs_commit_ops = { |
Andy Adamson | 21d9a85 | 2009-04-01 09:22:27 -0400 | [diff] [blame] | 1460 | #if defined(CONFIG_NFS_V4_1) |
| 1461 | .rpc_call_prepare = nfs_write_prepare, |
| 1462 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1463 | .rpc_call_done = nfs_commit_done, |
| 1464 | .rpc_release = nfs_commit_release, |
| 1465 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 1467 | int nfs_commit_inode(struct inode *inode, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | LIST_HEAD(head); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1470 | int may_wait = how & FLUSH_SYNC; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1471 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1473 | res = nfs_commit_set_lock(NFS_I(inode), may_wait); |
| 1474 | if (res <= 0) |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1475 | goto out_mark_dirty; |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1476 | spin_lock(&inode->i_lock); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1477 | res = nfs_scan_commit(inode, &head, 0, 0); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 1478 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | if (res) { |
Trond Myklebust | 7d46a49 | 2006-03-20 13:44:50 -0500 | [diff] [blame] | 1480 | int error = nfs_commit_list(inode, &head, how); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1481 | if (error < 0) |
| 1482 | return error; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1483 | if (!may_wait) |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1484 | goto out_mark_dirty; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1485 | error = wait_on_bit(&NFS_I(inode)->flags, |
| 1486 | NFS_INO_COMMIT, |
| 1487 | nfs_wait_bit_killable, |
| 1488 | TASK_KILLABLE); |
| 1489 | if (error < 0) |
| 1490 | return error; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1491 | } else |
| 1492 | nfs_commit_clear_lock(NFS_I(inode)); |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1493 | return res; |
| 1494 | /* Note: If we exit without ensuring that the commit is complete, |
| 1495 | * we must mark the inode as dirty. Otherwise, future calls to |
| 1496 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure |
| 1497 | * that the data is on the disk. |
| 1498 | */ |
| 1499 | out_mark_dirty: |
| 1500 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | return res; |
| 1502 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1503 | |
| 1504 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1505 | { |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1506 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1507 | int flags = FLUSH_SYNC; |
| 1508 | int ret = 0; |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1509 | |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1510 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 1511 | /* Don't commit yet if this is a non-blocking flush and there |
| 1512 | * are a lot of outstanding writes for this mapping. |
| 1513 | */ |
| 1514 | if (nfsi->ncommit <= (nfsi->npages >> 1)) |
| 1515 | goto out_mark_dirty; |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1516 | |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1517 | /* don't wait for the COMMIT response */ |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1518 | flags = 0; |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1519 | } |
| 1520 | |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1521 | ret = nfs_commit_inode(inode, flags); |
| 1522 | if (ret >= 0) { |
| 1523 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 1524 | if (ret < wbc->nr_to_write) |
| 1525 | wbc->nr_to_write -= ret; |
| 1526 | else |
| 1527 | wbc->nr_to_write = 0; |
| 1528 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1529 | return 0; |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1530 | } |
| 1531 | out_mark_dirty: |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1532 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
| 1533 | return ret; |
| 1534 | } |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1535 | #else |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1536 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1537 | { |
| 1538 | return 0; |
| 1539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | #endif |
| 1541 | |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1542 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 1543 | { |
| 1544 | return nfs_commit_unstable_pages(inode, wbc); |
| 1545 | } |
| 1546 | |
Trond Myklebust | acdc53b | 2010-02-19 17:03:26 -0800 | [diff] [blame] | 1547 | /* |
| 1548 | * flush the inode to disk. |
| 1549 | */ |
| 1550 | int nfs_wb_all(struct inode *inode) |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1551 | { |
| 1552 | struct writeback_control wbc = { |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 1553 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1554 | .nr_to_write = LONG_MAX, |
Trond Myklebust | d7fb120 | 2008-10-06 20:08:56 -0400 | [diff] [blame] | 1555 | .range_start = 0, |
| 1556 | .range_end = LLONG_MAX, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1557 | }; |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1558 | |
Trond Myklebust | acdc53b | 2010-02-19 17:03:26 -0800 | [diff] [blame] | 1559 | return sync_inode(inode, &wbc); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1560 | } |
| 1561 | |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1562 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
| 1563 | { |
| 1564 | struct nfs_page *req; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1565 | int ret = 0; |
| 1566 | |
| 1567 | BUG_ON(!PageLocked(page)); |
| 1568 | for (;;) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1569 | wait_on_page_writeback(page); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1570 | req = nfs_page_find_request(page); |
| 1571 | if (req == NULL) |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1572 | break; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1573 | if (nfs_lock_request_dontget(req)) { |
| 1574 | nfs_inode_remove_request(req); |
| 1575 | /* |
| 1576 | * In case nfs_inode_remove_request has marked the |
| 1577 | * page as being dirty |
| 1578 | */ |
| 1579 | cancel_dirty_page(page, PAGE_CACHE_SIZE); |
| 1580 | nfs_unlock_request(req); |
| 1581 | break; |
| 1582 | } |
| 1583 | ret = nfs_wait_on_request(req); |
Trond Myklebust | c9edda7 | 2010-01-26 15:41:34 -0500 | [diff] [blame] | 1584 | nfs_release_request(req); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1585 | if (ret < 0) |
Trond Myklebust | c988950 | 2010-02-19 17:03:21 -0800 | [diff] [blame] | 1586 | break; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1587 | } |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1588 | return ret; |
| 1589 | } |
| 1590 | |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1591 | /* |
| 1592 | * Write back all requests on one page - we do this before reading it. |
| 1593 | */ |
| 1594 | int nfs_wb_page(struct inode *inode, struct page *page) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1595 | { |
| 1596 | loff_t range_start = page_offset(page); |
| 1597 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1598 | struct writeback_control wbc = { |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1599 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1600 | .nr_to_write = 0, |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1601 | .range_start = range_start, |
| 1602 | .range_end = range_end, |
| 1603 | }; |
| 1604 | int ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1605 | |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1606 | for (;;) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1607 | wait_on_page_writeback(page); |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1608 | if (clear_page_dirty_for_io(page)) { |
| 1609 | ret = nfs_writepage_locked(page, &wbc); |
| 1610 | if (ret < 0) |
| 1611 | goto out_error; |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1612 | continue; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1613 | } |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1614 | if (!PagePrivate(page)) |
| 1615 | break; |
| 1616 | ret = nfs_commit_inode(inode, FLUSH_SYNC); |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1617 | if (ret < 0) |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1618 | goto out_error; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1619 | } |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1620 | return 0; |
| 1621 | out_error: |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1622 | return ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1623 | } |
| 1624 | |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1625 | #ifdef CONFIG_MIGRATION |
| 1626 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, |
| 1627 | struct page *page) |
| 1628 | { |
| 1629 | struct nfs_page *req; |
| 1630 | int ret; |
| 1631 | |
Trond Myklebust | 7549ad5 | 2010-02-08 09:32:34 -0500 | [diff] [blame] | 1632 | nfs_fscache_release_page(page, GFP_KERNEL); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1633 | |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 1634 | req = nfs_find_and_lock_request(page, false); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1635 | ret = PTR_ERR(req); |
| 1636 | if (IS_ERR(req)) |
| 1637 | goto out; |
| 1638 | |
| 1639 | ret = migrate_page(mapping, newpage, page); |
| 1640 | if (!req) |
| 1641 | goto out; |
| 1642 | if (ret) |
| 1643 | goto out_unlock; |
| 1644 | page_cache_get(newpage); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1645 | spin_lock(&mapping->host->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1646 | req->wb_page = newpage; |
| 1647 | SetPagePrivate(newpage); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1648 | set_page_private(newpage, (unsigned long)req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1649 | ClearPagePrivate(page); |
| 1650 | set_page_private(page, 0); |
Trond Myklebust | 190f38e | 2009-12-10 09:05:55 -0500 | [diff] [blame] | 1651 | spin_unlock(&mapping->host->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1652 | page_cache_release(page); |
| 1653 | out_unlock: |
| 1654 | nfs_clear_page_tag_locked(req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1655 | out: |
| 1656 | return ret; |
| 1657 | } |
| 1658 | #endif |
| 1659 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 1660 | int __init nfs_init_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | { |
| 1662 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", |
| 1663 | sizeof(struct nfs_write_data), |
| 1664 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1665 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | if (nfs_wdata_cachep == NULL) |
| 1667 | return -ENOMEM; |
| 1668 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1669 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
| 1670 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | if (nfs_wdata_mempool == NULL) |
| 1672 | return -ENOMEM; |
| 1673 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1674 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
| 1675 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | if (nfs_commit_mempool == NULL) |
| 1677 | return -ENOMEM; |
| 1678 | |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 1679 | /* |
| 1680 | * NFS congestion size, scale with available memory. |
| 1681 | * |
| 1682 | * 64MB: 8192k |
| 1683 | * 128MB: 11585k |
| 1684 | * 256MB: 16384k |
| 1685 | * 512MB: 23170k |
| 1686 | * 1GB: 32768k |
| 1687 | * 2GB: 46340k |
| 1688 | * 4GB: 65536k |
| 1689 | * 8GB: 92681k |
| 1690 | * 16GB: 131072k |
| 1691 | * |
| 1692 | * This allows larger machines to have larger/more transfers. |
| 1693 | * Limit the default to 256M |
| 1694 | */ |
| 1695 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); |
| 1696 | if (nfs_congestion_kb > 256*1024) |
| 1697 | nfs_congestion_kb = 256*1024; |
| 1698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | return 0; |
| 1700 | } |
| 1701 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 1702 | void nfs_destroy_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | { |
| 1704 | mempool_destroy(nfs_commit_mempool); |
| 1705 | mempool_destroy(nfs_wdata_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1706 | kmem_cache_destroy(nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | } |
| 1708 | |