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> |
Paul Gortmaker | afeacc8 | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 23 | #include <linux/export.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | #include "delegation.h" |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 28 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 29 | #include "iostat.h" |
Andy Adamson | def6ed7 | 2009-04-01 09:22:26 -0400 | [diff] [blame] | 30 | #include "nfs4_fs.h" |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 31 | #include "fscache.h" |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 32 | #include "pnfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 34 | #include "nfstrace.h" |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
| 37 | |
| 38 | #define MIN_POOL_WRITE (32) |
| 39 | #define MIN_POOL_COMMIT (4) |
| 40 | |
| 41 | /* |
| 42 | * Local function declarations |
| 43 | */ |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 44 | static void nfs_redirty_request(struct nfs_page *req); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 45 | static const struct rpc_call_ops nfs_commit_ops; |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 46 | static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops; |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 47 | static const struct nfs_commit_completion_ops nfs_commit_completion_ops; |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 48 | static const struct nfs_rw_ops nfs_rw_write_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 50 | static struct kmem_cache *nfs_wdata_cachep; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 51 | static mempool_t *nfs_wdata_mempool; |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 52 | static struct kmem_cache *nfs_cdata_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | static mempool_t *nfs_commit_mempool; |
| 54 | |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 55 | struct nfs_commit_data *nfs_commitdata_alloc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | { |
Mel Gorman | 192e501 | 2012-07-31 16:45:16 -0700 | [diff] [blame] | 57 | struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO); |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | if (p) { |
| 60 | memset(p, 0, sizeof(*p)); |
| 61 | INIT_LIST_HEAD(&p->pages); |
| 62 | } |
| 63 | return p; |
| 64 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 65 | EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 67 | void nfs_commit_free(struct nfs_commit_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
| 69 | mempool_free(p, nfs_commit_mempool); |
| 70 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 71 | EXPORT_SYMBOL_GPL(nfs_commit_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 73 | static struct nfs_rw_header *nfs_writehdr_alloc(void) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 74 | { |
Anna Schumaker | c0752cd | 2014-05-06 09:12:27 -0400 | [diff] [blame] | 75 | struct nfs_rw_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 76 | |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 77 | if (p) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 78 | memset(p, 0, sizeof(*p)); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 79 | return p; |
| 80 | } |
| 81 | |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 82 | static void nfs_writehdr_free(struct nfs_rw_header *whdr) |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 83 | { |
Fred Isaman | cd84160 | 2012-04-20 14:47:44 -0400 | [diff] [blame] | 84 | mempool_free(whdr, nfs_wdata_mempool); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 85 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 87 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
| 88 | { |
| 89 | ctx->error = error; |
| 90 | smp_wmb(); |
| 91 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 92 | } |
| 93 | |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 94 | static struct nfs_page * |
| 95 | nfs_page_find_request_locked(struct nfs_inode *nfsi, struct page *page) |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 96 | { |
| 97 | struct nfs_page *req = NULL; |
| 98 | |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 99 | if (PagePrivate(page)) |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 100 | req = (struct nfs_page *)page_private(page); |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 101 | else if (unlikely(PageSwapCache(page))) { |
| 102 | struct nfs_page *freq, *t; |
| 103 | |
| 104 | /* Linearly search the commit list for the correct req */ |
| 105 | list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) { |
| 106 | if (freq->wb_page == page) { |
| 107 | req = freq; |
| 108 | break; |
| 109 | } |
| 110 | } |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 111 | } |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 112 | |
| 113 | if (req) |
| 114 | kref_get(&req->wb_kref); |
| 115 | |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 116 | return req; |
| 117 | } |
| 118 | |
| 119 | static struct nfs_page *nfs_page_find_request(struct page *page) |
| 120 | { |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 121 | struct inode *inode = page_file_mapping(page)->host; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 122 | struct nfs_page *req = NULL; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 123 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 124 | spin_lock(&inode->i_lock); |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 125 | req = nfs_page_find_request_locked(NFS_I(inode), page); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 126 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 127 | return req; |
| 128 | } |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | /* Adjust the file length if we're writing beyond the end */ |
| 131 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) |
| 132 | { |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 133 | struct inode *inode = page_file_mapping(page)->host; |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 134 | loff_t end, i_size; |
| 135 | pgoff_t end_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 137 | spin_lock(&inode->i_lock); |
| 138 | i_size = i_size_read(inode); |
| 139 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 140 | if (i_size > 0 && page_file_index(page) < end_index) |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 141 | goto out; |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 142 | end = page_file_offset(page) + ((loff_t)offset+count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | if (i_size >= end) |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 144 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | i_size_write(inode, end); |
Trond Myklebust | a3d0145 | 2008-06-11 12:21:19 -0400 | [diff] [blame] | 146 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
| 147 | out: |
| 148 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 151 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
| 152 | static void nfs_set_pageerror(struct page *page) |
| 153 | { |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 154 | nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page)); |
Trond Myklebust | a301b77 | 2007-02-06 11:07:15 -0800 | [diff] [blame] | 155 | } |
| 156 | |
Weston Andros Adamson | d72ddcb | 2014-05-15 11:56:48 -0400 | [diff] [blame] | 157 | /* |
| 158 | * nfs_page_group_search_locked |
| 159 | * @head - head request of page group |
| 160 | * @page_offset - offset into page |
| 161 | * |
| 162 | * Search page group with head @head to find a request that contains the |
| 163 | * page offset @page_offset. |
| 164 | * |
| 165 | * Returns a pointer to the first matching nfs request, or NULL if no |
| 166 | * match is found. |
| 167 | * |
| 168 | * Must be called with the page group lock held |
| 169 | */ |
| 170 | static struct nfs_page * |
| 171 | nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) |
| 172 | { |
| 173 | struct nfs_page *req; |
| 174 | |
| 175 | WARN_ON_ONCE(head != head->wb_head); |
| 176 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags)); |
| 177 | |
| 178 | req = head; |
| 179 | do { |
| 180 | if (page_offset >= req->wb_pgbase && |
| 181 | page_offset < (req->wb_pgbase + req->wb_bytes)) |
| 182 | return req; |
| 183 | |
| 184 | req = req->wb_this_page; |
| 185 | } while (req != head); |
| 186 | |
| 187 | return NULL; |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * nfs_page_group_covers_page |
| 192 | * @head - head request of page group |
| 193 | * |
| 194 | * Return true if the page group with head @head covers the whole page, |
| 195 | * returns false otherwise |
| 196 | */ |
| 197 | static bool nfs_page_group_covers_page(struct nfs_page *req) |
| 198 | { |
| 199 | struct nfs_page *tmp; |
| 200 | unsigned int pos = 0; |
| 201 | unsigned int len = nfs_page_length(req->wb_page); |
| 202 | |
| 203 | nfs_page_group_lock(req); |
| 204 | |
| 205 | do { |
| 206 | tmp = nfs_page_group_search_locked(req->wb_head, pos); |
| 207 | if (tmp) { |
| 208 | /* no way this should happen */ |
| 209 | WARN_ON_ONCE(tmp->wb_pgbase != pos); |
| 210 | pos += tmp->wb_bytes - (pos - tmp->wb_pgbase); |
| 211 | } |
| 212 | } while (tmp && pos < len); |
| 213 | |
| 214 | nfs_page_group_unlock(req); |
| 215 | WARN_ON_ONCE(pos > len); |
| 216 | return pos == len; |
| 217 | } |
| 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | /* We can set the PG_uptodate flag if we see that a write request |
| 220 | * covers the full page. |
| 221 | */ |
Weston Andros Adamson | d72ddcb | 2014-05-15 11:56:48 -0400 | [diff] [blame] | 222 | static void nfs_mark_uptodate(struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { |
Weston Andros Adamson | d72ddcb | 2014-05-15 11:56:48 -0400 | [diff] [blame] | 224 | if (PageUptodate(req->wb_page)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | return; |
Weston Andros Adamson | d72ddcb | 2014-05-15 11:56:48 -0400 | [diff] [blame] | 226 | if (!nfs_page_group_covers_page(req)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | return; |
Weston Andros Adamson | d72ddcb | 2014-05-15 11:56:48 -0400 | [diff] [blame] | 228 | SetPageUptodate(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | static int wb_priority(struct writeback_control *wbc) |
| 232 | { |
| 233 | if (wbc->for_reclaim) |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 234 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
Wu Fengguang | b17621f | 2009-12-03 13:54:25 +0100 | [diff] [blame] | 235 | if (wbc->for_kupdate || wbc->for_background) |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 236 | return FLUSH_LOWPRI | FLUSH_COND_STABLE; |
| 237 | return FLUSH_COND_STABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 241 | * NFS congestion control |
| 242 | */ |
| 243 | |
| 244 | int nfs_congestion_kb; |
| 245 | |
| 246 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) |
| 247 | #define NFS_CONGESTION_OFF_THRESH \ |
| 248 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) |
| 249 | |
Trond Myklebust | deed85e | 2012-10-15 15:02:01 -0400 | [diff] [blame] | 250 | static void nfs_set_page_writeback(struct page *page) |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 251 | { |
Trond Myklebust | deed85e | 2012-10-15 15:02:01 -0400 | [diff] [blame] | 252 | struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host); |
Trond Myklebust | 5a6d41b | 2007-04-14 19:10:12 -0400 | [diff] [blame] | 253 | int ret = test_set_page_writeback(page); |
| 254 | |
Trond Myklebust | deed85e | 2012-10-15 15:02:01 -0400 | [diff] [blame] | 255 | WARN_ON_ONCE(ret != 0); |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 256 | |
Trond Myklebust | deed85e | 2012-10-15 15:02:01 -0400 | [diff] [blame] | 257 | if (atomic_long_inc_return(&nfss->writeback) > |
| 258 | NFS_CONGESTION_ON_THRESH) { |
| 259 | set_bdi_congested(&nfss->backing_dev_info, |
| 260 | BLK_RW_ASYNC); |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 261 | } |
| 262 | } |
| 263 | |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 264 | static void nfs_end_page_writeback(struct nfs_page *req) |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 265 | { |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 266 | struct inode *inode = page_file_mapping(req->wb_page)->host; |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 267 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 268 | |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 269 | if (!nfs_page_group_sync_on_bit(req, PG_WB_END)) |
| 270 | return; |
| 271 | |
| 272 | end_page_writeback(req->wb_page); |
Peter Zijlstra | c4dc4be | 2007-10-16 23:25:41 -0700 | [diff] [blame] | 273 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 274 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 275 | } |
| 276 | |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 277 | 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] | 278 | { |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 279 | struct inode *inode = page_file_mapping(page)->host; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 280 | struct nfs_page *req; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 281 | int ret; |
| 282 | |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 283 | spin_lock(&inode->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 284 | for (;;) { |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 285 | req = nfs_page_find_request_locked(NFS_I(inode), page); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 286 | if (req == NULL) |
| 287 | break; |
Trond Myklebust | 7ad84aa | 2012-05-09 13:19:15 -0400 | [diff] [blame] | 288 | if (nfs_lock_request(req)) |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 289 | break; |
| 290 | /* Note: If we hold the page lock, as is the case in nfs_writepage, |
Trond Myklebust | 7ad84aa | 2012-05-09 13:19:15 -0400 | [diff] [blame] | 291 | * then the call to nfs_lock_request() will always |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 292 | * succeed provided that someone hasn't already marked the |
| 293 | * request as dirty (in which case we don't care). |
| 294 | */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 295 | spin_unlock(&inode->i_lock); |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 296 | if (!nonblock) |
| 297 | ret = nfs_wait_on_request(req); |
| 298 | else |
| 299 | ret = -EAGAIN; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 300 | nfs_release_request(req); |
| 301 | if (ret != 0) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 302 | return ERR_PTR(ret); |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 303 | spin_lock(&inode->i_lock); |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 304 | } |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 305 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 306 | return req; |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * Find an associated nfs write request, and prepare to flush it out |
| 311 | * May return an error if the user signalled nfs_wait_on_request(). |
| 312 | */ |
| 313 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 314 | struct page *page, bool nonblock) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 315 | { |
| 316 | struct nfs_page *req; |
| 317 | int ret = 0; |
| 318 | |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 319 | req = nfs_find_and_lock_request(page, nonblock); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 320 | if (!req) |
| 321 | goto out; |
| 322 | ret = PTR_ERR(req); |
| 323 | if (IS_ERR(req)) |
| 324 | goto out; |
| 325 | |
Trond Myklebust | deed85e | 2012-10-15 15:02:01 -0400 | [diff] [blame] | 326 | nfs_set_page_writeback(page); |
| 327 | WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 328 | |
Trond Myklebust | deed85e | 2012-10-15 15:02:01 -0400 | [diff] [blame] | 329 | ret = 0; |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 330 | if (!nfs_pageio_add_request(pgio, req)) { |
| 331 | nfs_redirty_request(req); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 332 | ret = pgio->pg_error; |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 333 | } |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 334 | out: |
| 335 | return ret; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 336 | } |
| 337 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 338 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
| 339 | { |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 340 | struct inode *inode = page_file_mapping(page)->host; |
Trond Myklebust | cfb506e | 2010-07-30 15:31:57 -0400 | [diff] [blame] | 341 | int ret; |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 342 | |
| 343 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
| 344 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); |
| 345 | |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 346 | nfs_pageio_cond_complete(pgio, page_file_index(page)); |
Wu Fengguang | 1b430be | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 347 | 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] | 348 | if (ret == -EAGAIN) { |
| 349 | redirty_page_for_writepage(wbc, page); |
| 350 | ret = 0; |
| 351 | } |
| 352 | return ret; |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 353 | } |
| 354 | |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 355 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | * Write an mmapped page to the server. |
| 357 | */ |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 358 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 360 | struct nfs_pageio_descriptor pgio; |
Trond Myklebust | e261f51 | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 361 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
Christoph Hellwig | a20c93e | 2014-04-16 15:07:21 +0200 | [diff] [blame] | 363 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc), |
| 364 | false, &nfs_async_write_completion_ops); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 365 | err = nfs_do_writepage(page, wbc, &pgio); |
| 366 | nfs_pageio_complete(&pgio); |
| 367 | if (err < 0) |
| 368 | return err; |
| 369 | if (pgio.pg_error < 0) |
| 370 | return pgio.pg_error; |
| 371 | return 0; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | int nfs_writepage(struct page *page, struct writeback_control *wbc) |
| 375 | { |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 376 | int ret; |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 377 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 378 | ret = nfs_writepage_locked(page, wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | unlock_page(page); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 380 | return ret; |
| 381 | } |
| 382 | |
| 383 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) |
| 384 | { |
| 385 | int ret; |
| 386 | |
| 387 | ret = nfs_do_writepage(page, wbc, data); |
| 388 | unlock_page(page); |
| 389 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
| 393 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | struct inode *inode = mapping->host; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 395 | unsigned long *bitlock = &NFS_I(inode)->flags; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 396 | struct nfs_pageio_descriptor pgio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | int err; |
| 398 | |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 399 | /* Stop dirtying of new pages while we sync */ |
| 400 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, |
| 401 | nfs_wait_bit_killable, TASK_KILLABLE); |
| 402 | if (err) |
| 403 | goto out_err; |
| 404 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 405 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
| 406 | |
Christoph Hellwig | a20c93e | 2014-04-16 15:07:21 +0200 | [diff] [blame] | 407 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false, |
| 408 | &nfs_async_write_completion_ops); |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 409 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 410 | nfs_pageio_complete(&pgio); |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 411 | |
| 412 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 413 | smp_mb__after_atomic(); |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 414 | wake_up_bit(bitlock, NFS_INO_FLUSHING); |
| 415 | |
Trond Myklebust | f758c885 | 2007-07-22 19:27:32 -0400 | [diff] [blame] | 416 | if (err < 0) |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 417 | goto out_err; |
| 418 | err = pgio.pg_error; |
| 419 | if (err < 0) |
| 420 | goto out_err; |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 421 | return 0; |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 422 | out_err: |
| 423 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Insert a write request into an inode |
| 428 | */ |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 429 | static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | { |
| 431 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 432 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 433 | WARN_ON_ONCE(req->wb_this_page != req); |
| 434 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 435 | /* Lock the request! */ |
Trond Myklebust | 7ad84aa | 2012-05-09 13:19:15 -0400 | [diff] [blame] | 436 | nfs_lock_request(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 437 | |
| 438 | spin_lock(&inode->i_lock); |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 439 | if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
Trond Myklebust | a9a4a87 | 2011-10-17 16:08:46 -0700 | [diff] [blame] | 440 | inode->i_version++; |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 441 | /* |
| 442 | * Swap-space should not get truncated. Hence no need to plug the race |
| 443 | * with invalidate/truncate. |
| 444 | */ |
| 445 | if (likely(!PageSwapCache(req->wb_page))) { |
| 446 | set_bit(PG_MAPPED, &req->wb_flags); |
| 447 | SetPagePrivate(req->wb_page); |
| 448 | set_page_private(req->wb_page, (unsigned long)req); |
| 449 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | nfsi->npages++; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 451 | set_bit(PG_INODE_REF, &req->wb_flags); |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 452 | kref_get(&req->wb_kref); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 453 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | /* |
Peter Zijlstra | 89a0914 | 2007-03-16 13:38:26 -0800 | [diff] [blame] | 457 | * Remove a write request from an inode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | */ |
| 459 | static void nfs_inode_remove_request(struct nfs_page *req) |
| 460 | { |
Al Viro | 3d4ff43 | 2011-06-22 18:40:12 -0400 | [diff] [blame] | 461 | struct inode *inode = req->wb_context->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | struct nfs_inode *nfsi = NFS_I(inode); |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 463 | struct nfs_page *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 465 | if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { |
| 466 | head = req->wb_head; |
| 467 | |
| 468 | spin_lock(&inode->i_lock); |
| 469 | if (likely(!PageSwapCache(head->wb_page))) { |
| 470 | set_page_private(head->wb_page, 0); |
| 471 | ClearPagePrivate(head->wb_page); |
| 472 | clear_bit(PG_MAPPED, &head->wb_flags); |
| 473 | } |
| 474 | nfsi->npages--; |
| 475 | spin_unlock(&inode->i_lock); |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 476 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | nfs_release_request(req); |
| 478 | } |
| 479 | |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 480 | static void |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 481 | nfs_mark_request_dirty(struct nfs_page *req) |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 482 | { |
Trond Myklebust | 61822ab | 2006-12-05 00:35:42 -0500 | [diff] [blame] | 483 | __set_page_dirty_nobuffers(req->wb_page); |
| 484 | } |
| 485 | |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 486 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 487 | /** |
| 488 | * nfs_request_add_commit_list - add request to a commit list |
| 489 | * @req: pointer to a struct nfs_page |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 490 | * @dst: commit list head |
| 491 | * @cinfo: holds list lock and accounting info |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 492 | * |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 493 | * This sets the PG_CLEAN bit, updates the cinfo count of |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 494 | * number of outstanding requests requiring a commit as well as |
| 495 | * the MM page stats. |
| 496 | * |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 497 | * The caller must _not_ hold the cinfo->lock, but must be |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 498 | * holding the nfs_page lock. |
| 499 | */ |
| 500 | void |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 501 | nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, |
| 502 | struct nfs_commit_info *cinfo) |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 503 | { |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 504 | set_bit(PG_CLEAN, &(req)->wb_flags); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 505 | spin_lock(cinfo->lock); |
| 506 | nfs_list_add_request(req, dst); |
| 507 | cinfo->mds->ncommit++; |
| 508 | spin_unlock(cinfo->lock); |
Fred Isaman | 56f9cd6 | 2012-04-20 14:47:56 -0400 | [diff] [blame] | 509 | if (!cinfo->dreq) { |
| 510 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 511 | inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, |
Fred Isaman | 56f9cd6 | 2012-04-20 14:47:56 -0400 | [diff] [blame] | 512 | BDI_RECLAIMABLE); |
| 513 | __mark_inode_dirty(req->wb_context->dentry->d_inode, |
| 514 | I_DIRTY_DATASYNC); |
| 515 | } |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 516 | } |
| 517 | EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); |
| 518 | |
| 519 | /** |
| 520 | * nfs_request_remove_commit_list - Remove request from a commit list |
| 521 | * @req: pointer to a nfs_page |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 522 | * @cinfo: holds list lock and accounting info |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 523 | * |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 524 | * This clears the PG_CLEAN bit, and updates the cinfo's count of |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 525 | * number of outstanding requests requiring a commit |
| 526 | * It does not update the MM page stats. |
| 527 | * |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 528 | * The caller _must_ hold the cinfo->lock and the nfs_page lock. |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 529 | */ |
| 530 | void |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 531 | nfs_request_remove_commit_list(struct nfs_page *req, |
| 532 | struct nfs_commit_info *cinfo) |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 533 | { |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 534 | if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) |
| 535 | return; |
| 536 | nfs_list_remove_request(req); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 537 | cinfo->mds->ncommit--; |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 538 | } |
| 539 | EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); |
| 540 | |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 541 | static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, |
| 542 | struct inode *inode) |
| 543 | { |
| 544 | cinfo->lock = &inode->i_lock; |
| 545 | cinfo->mds = &NFS_I(inode)->commit_info; |
| 546 | cinfo->ds = pnfs_get_ds_info(inode); |
Fred Isaman | b359f9d | 2012-04-20 14:47:55 -0400 | [diff] [blame] | 547 | cinfo->dreq = NULL; |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 548 | cinfo->completion_ops = &nfs_commit_completion_ops; |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | void nfs_init_cinfo(struct nfs_commit_info *cinfo, |
| 552 | struct inode *inode, |
| 553 | struct nfs_direct_req *dreq) |
| 554 | { |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 555 | if (dreq) |
| 556 | nfs_init_cinfo_from_dreq(cinfo, dreq); |
| 557 | else |
| 558 | nfs_init_cinfo_from_inode(cinfo, inode); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 559 | } |
| 560 | EXPORT_SYMBOL_GPL(nfs_init_cinfo); |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | /* |
| 563 | * Add a request to the inode's commit list. |
| 564 | */ |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 565 | void |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 566 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, |
| 567 | struct nfs_commit_info *cinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 569 | if (pnfs_mark_request_commit(req, lseg, cinfo)) |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 570 | return; |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 571 | nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 573 | |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 574 | static void |
| 575 | nfs_clear_page_commit(struct page *page) |
| 576 | { |
| 577 | dec_zone_page_state(page, NR_UNSTABLE_NFS); |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 578 | dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE); |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 579 | } |
| 580 | |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 581 | static void |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 582 | nfs_clear_request_commit(struct nfs_page *req) |
| 583 | { |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 584 | if (test_bit(PG_CLEAN, &req->wb_flags)) { |
| 585 | struct inode *inode = req->wb_context->dentry->d_inode; |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 586 | struct nfs_commit_info cinfo; |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 587 | |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 588 | nfs_init_cinfo_from_inode(&cinfo, inode); |
| 589 | if (!pnfs_clear_request_commit(req, &cinfo)) { |
| 590 | spin_lock(cinfo.lock); |
| 591 | nfs_request_remove_commit_list(req, &cinfo); |
| 592 | spin_unlock(cinfo.lock); |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 593 | } |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 594 | nfs_clear_page_commit(req->wb_page); |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 595 | } |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 596 | } |
| 597 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 598 | static inline |
Anna Schumaker | 9c7e1b3 | 2014-05-06 09:12:26 -0400 | [diff] [blame] | 599 | int nfs_write_need_commit(struct nfs_pgio_data *data) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 600 | { |
Fred Isaman | 465d524 | 2011-03-23 13:27:44 +0000 | [diff] [blame] | 601 | if (data->verf.committed == NFS_DATA_SYNC) |
Fred Isaman | cd84160 | 2012-04-20 14:47:44 -0400 | [diff] [blame] | 602 | return data->header->lseg == NULL; |
| 603 | return data->verf.committed != NFS_FILE_SYNC; |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 604 | } |
| 605 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 606 | #else |
Bryan Schumaker | 68cd6fa | 2012-04-30 14:30:22 -0400 | [diff] [blame] | 607 | static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, |
| 608 | struct inode *inode) |
| 609 | { |
| 610 | } |
| 611 | |
| 612 | void nfs_init_cinfo(struct nfs_commit_info *cinfo, |
| 613 | struct inode *inode, |
| 614 | struct nfs_direct_req *dreq) |
| 615 | { |
| 616 | } |
| 617 | |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 618 | void |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 619 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, |
| 620 | struct nfs_commit_info *cinfo) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 621 | { |
| 622 | } |
| 623 | |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 624 | static void |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 625 | nfs_clear_request_commit(struct nfs_page *req) |
| 626 | { |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 627 | } |
| 628 | |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 629 | static inline |
Anna Schumaker | 9c7e1b3 | 2014-05-06 09:12:26 -0400 | [diff] [blame] | 630 | int nfs_write_need_commit(struct nfs_pgio_data *data) |
Trond Myklebust | 8e821ca | 2007-04-20 16:12:34 -0400 | [diff] [blame] | 631 | { |
| 632 | return 0; |
| 633 | } |
| 634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | #endif |
| 636 | |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 637 | static void nfs_write_completion(struct nfs_pgio_header *hdr) |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 638 | { |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 639 | struct nfs_commit_info cinfo; |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 640 | unsigned long bytes = 0; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 641 | bool do_destroy; |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 642 | |
| 643 | if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) |
| 644 | goto out; |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 645 | nfs_init_cinfo_from_inode(&cinfo, hdr->inode); |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 646 | while (!list_empty(&hdr->pages)) { |
| 647 | struct nfs_page *req = nfs_list_entry(hdr->pages.next); |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 648 | |
| 649 | bytes += req->wb_bytes; |
| 650 | nfs_list_remove_request(req); |
| 651 | if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && |
| 652 | (hdr->good_bytes < bytes)) { |
Trond Myklebust | d1182b3 | 2012-05-09 13:37:43 -0400 | [diff] [blame] | 653 | nfs_set_pageerror(req->wb_page); |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 654 | nfs_context_set_write_error(req->wb_context, hdr->error); |
| 655 | goto remove_req; |
| 656 | } |
| 657 | if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) { |
| 658 | nfs_mark_request_dirty(req); |
| 659 | goto next; |
| 660 | } |
| 661 | if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) { |
Anna Schumaker | f79d06f | 2014-05-06 09:12:28 -0400 | [diff] [blame] | 662 | memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 663 | nfs_mark_request_commit(req, hdr->lseg, &cinfo); |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 664 | goto next; |
| 665 | } |
| 666 | remove_req: |
| 667 | nfs_inode_remove_request(req); |
| 668 | next: |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 669 | nfs_unlock_request(req); |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 670 | nfs_end_page_writeback(req); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 671 | do_destroy = !test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags); |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 672 | nfs_release_request(req); |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 673 | } |
| 674 | out: |
| 675 | hdr->release(hdr); |
| 676 | } |
| 677 | |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 678 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 679 | unsigned long |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 680 | nfs_reqs_to_commit(struct nfs_commit_info *cinfo) |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 681 | { |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 682 | return cinfo->mds->ncommit; |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 683 | } |
| 684 | |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 685 | /* cinfo->lock held by caller */ |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 686 | int |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 687 | nfs_scan_commit_list(struct list_head *src, struct list_head *dst, |
| 688 | struct nfs_commit_info *cinfo, int max) |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 689 | { |
| 690 | struct nfs_page *req, *tmp; |
| 691 | int ret = 0; |
| 692 | |
| 693 | list_for_each_entry_safe(req, tmp, src, wb_list) { |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 694 | if (!nfs_lock_request(req)) |
| 695 | continue; |
Trond Myklebust | 7ad84aa | 2012-05-09 13:19:15 -0400 | [diff] [blame] | 696 | kref_get(&req->wb_kref); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 697 | if (cond_resched_lock(cinfo->lock)) |
Trond Myklebust | 3b3be88 | 2012-03-17 11:59:30 -0400 | [diff] [blame] | 698 | list_safe_reset_next(req, tmp, wb_list); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 699 | nfs_request_remove_commit_list(req, cinfo); |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 700 | nfs_list_add_request(req, dst); |
| 701 | ret++; |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 702 | if ((ret == max) && !cinfo->dreq) |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 703 | break; |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 704 | } |
| 705 | return ret; |
| 706 | } |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | /* |
| 709 | * nfs_scan_commit - Scan an inode for commit requests |
| 710 | * @inode: NFS inode to scan |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 711 | * @dst: mds destination list |
| 712 | * @cinfo: mds and ds lists of reqs ready to commit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | * |
| 714 | * Moves requests from the inode's 'commit' request list. |
| 715 | * The requests are *not* checked to ensure that they form a contiguous set. |
| 716 | */ |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 717 | int |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 718 | nfs_scan_commit(struct inode *inode, struct list_head *dst, |
| 719 | struct nfs_commit_info *cinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | { |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 721 | int ret = 0; |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 722 | |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 723 | spin_lock(cinfo->lock); |
| 724 | if (cinfo->mds->ncommit > 0) { |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 725 | const int max = INT_MAX; |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 726 | |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 727 | ret = nfs_scan_commit_list(&cinfo->mds->list, dst, |
| 728 | cinfo, max); |
| 729 | ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 730 | } |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 731 | spin_unlock(cinfo->lock); |
Trond Myklebust | ff778d0 | 2010-02-19 16:53:39 -0800 | [diff] [blame] | 732 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 734 | |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 735 | #else |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 736 | unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo) |
Trond Myklebust | fb8a1f1 | 2009-03-11 14:10:29 -0400 | [diff] [blame] | 737 | { |
| 738 | return 0; |
| 739 | } |
| 740 | |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 741 | int nfs_scan_commit(struct inode *inode, struct list_head *dst, |
| 742 | struct nfs_commit_info *cinfo) |
Trond Myklebust | c42de9d | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 743 | { |
| 744 | return 0; |
| 745 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | #endif |
| 747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | /* |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 749 | * Search for an existing write request, and attempt to update |
| 750 | * it to reflect a new dirty region on a given page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | * |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 752 | * If the attempt fails, then the existing request is flushed out |
| 753 | * to disk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | */ |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 755 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
| 756 | struct page *page, |
| 757 | unsigned int offset, |
| 758 | unsigned int bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | { |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 760 | struct nfs_page *req; |
| 761 | unsigned int rqend; |
| 762 | unsigned int end; |
| 763 | int error; |
| 764 | |
| 765 | if (!PagePrivate(page)) |
| 766 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
| 768 | end = offset + bytes; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 769 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | for (;;) { |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 772 | req = nfs_page_find_request_locked(NFS_I(inode), page); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 773 | if (req == NULL) |
| 774 | goto out_unlock; |
Trond Myklebust | 277459d | 2006-12-05 00:35:35 -0500 | [diff] [blame] | 775 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 776 | /* should be handled by nfs_flush_incompatible */ |
| 777 | WARN_ON_ONCE(req->wb_head != req); |
| 778 | WARN_ON_ONCE(req->wb_this_page != req); |
| 779 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 780 | rqend = req->wb_offset + req->wb_bytes; |
| 781 | /* |
| 782 | * Tell the caller to flush out the request if |
| 783 | * the offsets are non-contiguous. |
| 784 | * Note: nfs_flush_incompatible() will already |
| 785 | * have flushed out requests having wrong owners. |
| 786 | */ |
Trond Myklebust | e468bae | 2008-06-13 13:25:22 -0400 | [diff] [blame] | 787 | if (offset > rqend |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 788 | || end < req->wb_offset) |
| 789 | goto out_flushme; |
| 790 | |
Trond Myklebust | 7ad84aa | 2012-05-09 13:19:15 -0400 | [diff] [blame] | 791 | if (nfs_lock_request(req)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 794 | /* The request is locked, so wait and then retry */ |
Trond Myklebust | 587142f | 2007-07-02 09:57:54 -0400 | [diff] [blame] | 795 | spin_unlock(&inode->i_lock); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 796 | error = nfs_wait_on_request(req); |
| 797 | nfs_release_request(req); |
| 798 | if (error != 0) |
| 799 | goto out_err; |
| 800 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | } |
| 802 | |
| 803 | /* Okay, the request matches. Update the region */ |
| 804 | if (offset < req->wb_offset) { |
| 805 | req->wb_offset = offset; |
| 806 | req->wb_pgbase = offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | if (end > rqend) |
| 809 | req->wb_bytes = end - req->wb_offset; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 810 | else |
| 811 | req->wb_bytes = rqend - req->wb_offset; |
| 812 | out_unlock: |
| 813 | spin_unlock(&inode->i_lock); |
Fred Isaman | ca138f3 | 2012-04-05 15:26:36 -0400 | [diff] [blame] | 814 | if (req) |
| 815 | nfs_clear_request_commit(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 816 | return req; |
| 817 | out_flushme: |
| 818 | spin_unlock(&inode->i_lock); |
| 819 | nfs_release_request(req); |
| 820 | error = nfs_wb_page(inode, page); |
| 821 | out_err: |
| 822 | return ERR_PTR(error); |
| 823 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 825 | /* |
| 826 | * Try to update an existing write request, or create one if there is none. |
| 827 | * |
| 828 | * Note: Should always be called with the Page Lock held to prevent races |
| 829 | * if we have to add a new request. Also assumes that the caller has |
| 830 | * already called nfs_flush_incompatible() if necessary. |
| 831 | */ |
| 832 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, |
| 833 | struct page *page, unsigned int offset, unsigned int bytes) |
| 834 | { |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 835 | struct inode *inode = page_file_mapping(page)->host; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 836 | struct nfs_page *req; |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 837 | |
| 838 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
| 839 | if (req != NULL) |
| 840 | goto out; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 841 | req = nfs_create_request(ctx, page, NULL, offset, bytes); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 842 | if (IS_ERR(req)) |
| 843 | goto out; |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 844 | nfs_inode_add_request(inode, req); |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 845 | out: |
Trond Myklebust | 61e930a | 2007-10-18 17:08:05 -0400 | [diff] [blame] | 846 | return req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 849 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
| 850 | unsigned int offset, unsigned int count) |
| 851 | { |
| 852 | struct nfs_page *req; |
| 853 | |
| 854 | req = nfs_setup_write_request(ctx, page, offset, count); |
| 855 | if (IS_ERR(req)) |
| 856 | return PTR_ERR(req); |
| 857 | /* Update file length */ |
| 858 | nfs_grow_file(page, offset, count); |
Weston Andros Adamson | d72ddcb | 2014-05-15 11:56:48 -0400 | [diff] [blame] | 859 | nfs_mark_uptodate(req); |
Trond Myklebust | a6305dd | 2010-04-09 19:07:08 -0400 | [diff] [blame] | 860 | nfs_mark_request_dirty(req); |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 861 | nfs_unlock_and_release_request(req); |
Trond Myklebust | e7d3906 | 2008-06-13 12:12:32 -0400 | [diff] [blame] | 862 | return 0; |
| 863 | } |
| 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | int nfs_flush_incompatible(struct file *file, struct page *page) |
| 866 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 867 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Trond Myklebust | 2a36915 | 2012-08-13 18:54:45 -0400 | [diff] [blame] | 868 | struct nfs_lock_context *l_ctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | struct nfs_page *req; |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 870 | int do_flush, status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | /* |
| 872 | * Look for a request corresponding to this page. If there |
| 873 | * is one, and it belongs to another file, we flush it out |
| 874 | * before we try to copy anything into the page. Do this |
| 875 | * due to the lack of an ACCESS-type call in NFSv2. |
| 876 | * Also do the same if we find a request from an existing |
| 877 | * dropped page. |
| 878 | */ |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 879 | do { |
| 880 | req = nfs_page_find_request(page); |
| 881 | if (req == NULL) |
| 882 | return 0; |
Trond Myklebust | 2a36915 | 2012-08-13 18:54:45 -0400 | [diff] [blame] | 883 | l_ctx = req->wb_lock_context; |
| 884 | do_flush = req->wb_page != page || req->wb_context != ctx; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 885 | /* for now, flush if more than 1 request in page_group */ |
| 886 | do_flush |= req->wb_this_page != req; |
Trond Myklebust | 0f1d260 | 2013-09-05 15:52:51 -0400 | [diff] [blame] | 887 | if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) { |
Trond Myklebust | 2a36915 | 2012-08-13 18:54:45 -0400 | [diff] [blame] | 888 | do_flush |= l_ctx->lockowner.l_owner != current->files |
| 889 | || l_ctx->lockowner.l_pid != current->tgid; |
| 890 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | nfs_release_request(req); |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 892 | if (!do_flush) |
| 893 | return 0; |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 894 | status = nfs_wb_page(page_file_mapping(page)->host, page); |
Trond Myklebust | 1a54533 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 895 | } while (status == 0); |
| 896 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | /* |
Andy Adamson | dc24826 | 2013-08-14 11:59:16 -0400 | [diff] [blame] | 900 | * Avoid buffered writes when a open context credential's key would |
| 901 | * expire soon. |
| 902 | * |
| 903 | * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. |
| 904 | * |
| 905 | * Return 0 and set a credential flag which triggers the inode to flush |
| 906 | * and performs NFS_FILE_SYNC writes if the key will expired within |
| 907 | * RPC_KEY_EXPIRE_TIMEO. |
| 908 | */ |
| 909 | int |
| 910 | nfs_key_timeout_notify(struct file *filp, struct inode *inode) |
| 911 | { |
| 912 | struct nfs_open_context *ctx = nfs_file_open_context(filp); |
| 913 | struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; |
| 914 | |
| 915 | return rpcauth_key_timeout_notify(auth, ctx->cred); |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * Test if the open context credential key is marked to expire soon. |
| 920 | */ |
| 921 | bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx) |
| 922 | { |
| 923 | return rpcauth_cred_key_to_expire(ctx->cred); |
| 924 | } |
| 925 | |
| 926 | /* |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 927 | * If the page cache is marked as unsafe or invalid, then we can't rely on |
| 928 | * the PageUptodate() flag. In this case, we will need to turn off |
| 929 | * write optimisations that depend on the page contents being correct. |
| 930 | */ |
Trond Myklebust | 8d197a5 | 2012-04-29 12:50:01 -0400 | [diff] [blame] | 931 | static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 932 | { |
Jeff Layton | d529ef8 | 2014-01-27 13:46:15 -0500 | [diff] [blame] | 933 | struct nfs_inode *nfsi = NFS_I(inode); |
| 934 | |
Trond Myklebust | 8d197a5 | 2012-04-29 12:50:01 -0400 | [diff] [blame] | 935 | if (nfs_have_delegated_attributes(inode)) |
| 936 | goto out; |
Jeff Layton | d529ef8 | 2014-01-27 13:46:15 -0500 | [diff] [blame] | 937 | if (nfsi->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE)) |
| 938 | return false; |
Jeff Layton | 4db72b4 | 2014-01-28 13:47:46 -0500 | [diff] [blame] | 939 | smp_rmb(); |
Jeff Layton | d529ef8 | 2014-01-27 13:46:15 -0500 | [diff] [blame] | 940 | if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) |
Trond Myklebust | 8d197a5 | 2012-04-29 12:50:01 -0400 | [diff] [blame] | 941 | return false; |
| 942 | out: |
| 943 | return PageUptodate(page) != 0; |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 944 | } |
| 945 | |
Scott Mayhew | c755966 | 2013-07-05 17:33:19 -0400 | [diff] [blame] | 946 | /* If we know the page is up to date, and we're not using byte range locks (or |
| 947 | * if we have the whole file locked for writing), it may be more efficient to |
| 948 | * extend the write to cover the entire page in order to avoid fragmentation |
| 949 | * inefficiencies. |
| 950 | * |
Scott Mayhew | 263b450 | 2014-01-17 15:12:05 -0500 | [diff] [blame] | 951 | * If the file is opened for synchronous writes then we can just skip the rest |
| 952 | * of the checks. |
Scott Mayhew | c755966 | 2013-07-05 17:33:19 -0400 | [diff] [blame] | 953 | */ |
| 954 | static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode) |
| 955 | { |
| 956 | if (file->f_flags & O_DSYNC) |
| 957 | return 0; |
Scott Mayhew | 263b450 | 2014-01-17 15:12:05 -0500 | [diff] [blame] | 958 | if (!nfs_write_pageuptodate(page, inode)) |
| 959 | return 0; |
Scott Mayhew | c755966 | 2013-07-05 17:33:19 -0400 | [diff] [blame] | 960 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
| 961 | return 1; |
Scott Mayhew | 263b450 | 2014-01-17 15:12:05 -0500 | [diff] [blame] | 962 | if (inode->i_flock == NULL || (inode->i_flock->fl_start == 0 && |
Scott Mayhew | c755966 | 2013-07-05 17:33:19 -0400 | [diff] [blame] | 963 | inode->i_flock->fl_end == OFFSET_MAX && |
Scott Mayhew | 263b450 | 2014-01-17 15:12:05 -0500 | [diff] [blame] | 964 | inode->i_flock->fl_type != F_RDLCK)) |
Scott Mayhew | c755966 | 2013-07-05 17:33:19 -0400 | [diff] [blame] | 965 | return 1; |
| 966 | return 0; |
| 967 | } |
| 968 | |
Trond Myklebust | 5d47a35 | 2008-02-07 17:24:07 -0500 | [diff] [blame] | 969 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | * Update and possibly write a cached page of an NFS file. |
| 971 | * |
| 972 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad |
| 973 | * things with a page scheduled for an RPC call (e.g. invalidate it). |
| 974 | */ |
| 975 | int nfs_updatepage(struct file *file, struct page *page, |
| 976 | unsigned int offset, unsigned int count) |
| 977 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 978 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 979 | struct inode *inode = page_file_mapping(page)->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | int status = 0; |
| 981 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 982 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
| 983 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 984 | dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", |
| 985 | file, count, (long long)(page_file_offset(page) + offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
Scott Mayhew | c755966 | 2013-07-05 17:33:19 -0400 | [diff] [blame] | 987 | if (nfs_can_extend_write(file, page, inode)) { |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 988 | count = max(count + offset, nfs_page_length(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | } |
| 991 | |
Trond Myklebust | e21195a | 2006-12-05 00:35:39 -0500 | [diff] [blame] | 992 | status = nfs_writepage_setup(ctx, page, offset, count); |
Trond Myklebust | 03fa9e8 | 2008-06-05 16:02:35 -0400 | [diff] [blame] | 993 | if (status < 0) |
| 994 | nfs_set_pageerror(page); |
Trond Myklebust | 59b7c05 | 2011-10-17 18:22:55 -0700 | [diff] [blame] | 995 | else |
| 996 | __set_page_dirty_nobuffers(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 998 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | status, (long long)i_size_read(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | return status; |
| 1001 | } |
| 1002 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1003 | static int flush_task_priority(int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | { |
| 1005 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { |
| 1006 | case FLUSH_HIGHPRI: |
| 1007 | return RPC_PRIORITY_HIGH; |
| 1008 | case FLUSH_LOWPRI: |
| 1009 | return RPC_PRIORITY_LOW; |
| 1010 | } |
| 1011 | return RPC_PRIORITY_NORMAL; |
| 1012 | } |
| 1013 | |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 1014 | static void nfs_initiate_write(struct nfs_pgio_data *data, struct rpc_message *msg, |
| 1015 | struct rpc_task_setup *task_setup_data, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | { |
Fred Isaman | cd84160 | 2012-04-20 14:47:44 -0400 | [diff] [blame] | 1017 | struct inode *inode = data->header->inode; |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1018 | int priority = flush_task_priority(how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 1020 | task_setup_data->priority = priority; |
| 1021 | NFS_PROTO(inode)->write_setup(data, msg); |
Andy Adamson | d138d5d | 2011-03-03 15:13:41 +0000 | [diff] [blame] | 1022 | |
Weston Andros Adamson | 8c21c62 | 2013-08-13 16:37:37 -0400 | [diff] [blame] | 1023 | nfs4_state_protect_write(NFS_SERVER(inode)->nfs_client, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 1024 | &task_setup_data->rpc_client, msg, data); |
Trond Myklebust | 275acaa | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1025 | } |
| 1026 | |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 1027 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
| 1028 | * call this on each, which will prepare them to be retried on next |
| 1029 | * writeback using standard nfs. |
| 1030 | */ |
| 1031 | static void nfs_redirty_request(struct nfs_page *req) |
| 1032 | { |
| 1033 | nfs_mark_request_dirty(req); |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 1034 | nfs_unlock_request(req); |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 1035 | nfs_end_page_writeback(req); |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 1036 | nfs_release_request(req); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 1037 | } |
| 1038 | |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 1039 | static void nfs_async_write_error(struct list_head *head) |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1040 | { |
| 1041 | struct nfs_page *req; |
| 1042 | |
| 1043 | while (!list_empty(head)) { |
| 1044 | req = nfs_list_entry(head->next); |
| 1045 | nfs_list_remove_request(req); |
| 1046 | nfs_redirty_request(req); |
| 1047 | } |
| 1048 | } |
| 1049 | |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 1050 | static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { |
| 1051 | .error_cleanup = nfs_async_write_error, |
| 1052 | .completion = nfs_write_completion, |
| 1053 | }; |
| 1054 | |
Bryan Schumaker | 57208fa | 2012-06-20 15:53:48 -0400 | [diff] [blame] | 1055 | void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
Christoph Hellwig | a20c93e | 2014-04-16 15:07:21 +0200 | [diff] [blame] | 1056 | struct inode *inode, int ioflags, bool force_mds, |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 1057 | const struct nfs_pgio_completion_ops *compl_ops) |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 1058 | { |
Christoph Hellwig | a20c93e | 2014-04-16 15:07:21 +0200 | [diff] [blame] | 1059 | struct nfs_server *server = NFS_SERVER(inode); |
Anna Schumaker | 41d8d5b | 2014-05-06 09:12:40 -0400 | [diff] [blame] | 1060 | const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; |
Christoph Hellwig | a20c93e | 2014-04-16 15:07:21 +0200 | [diff] [blame] | 1061 | |
| 1062 | #ifdef CONFIG_NFS_V4_1 |
| 1063 | if (server->pnfs_curr_ld && !force_mds) |
| 1064 | pg_ops = server->pnfs_curr_ld->pg_write_ops; |
| 1065 | #endif |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 1066 | nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, |
| 1067 | server->wsize, ioflags); |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 1068 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1069 | EXPORT_SYMBOL_GPL(nfs_pageio_init_write); |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 1070 | |
Trond Myklebust | dce8129 | 2011-07-13 15:59:19 -0400 | [diff] [blame] | 1071 | void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) |
| 1072 | { |
Anna Schumaker | 41d8d5b | 2014-05-06 09:12:40 -0400 | [diff] [blame] | 1073 | pgio->pg_ops = &nfs_pgio_rw_ops; |
Trond Myklebust | dce8129 | 2011-07-13 15:59:19 -0400 | [diff] [blame] | 1074 | pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; |
| 1075 | } |
Trond Myklebust | 1f94535 | 2011-07-13 15:59:57 -0400 | [diff] [blame] | 1076 | EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); |
Trond Myklebust | dce8129 | 2011-07-13 15:59:19 -0400 | [diff] [blame] | 1077 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1079 | void nfs_commit_prepare(struct rpc_task *task, void *calldata) |
| 1080 | { |
| 1081 | struct nfs_commit_data *data = calldata; |
| 1082 | |
| 1083 | NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); |
| 1084 | } |
| 1085 | |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 1086 | static void nfs_writeback_release_common(struct nfs_pgio_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | { |
Fred Isaman | cd84160 | 2012-04-20 14:47:44 -0400 | [diff] [blame] | 1088 | struct nfs_pgio_header *hdr = data->header; |
Trond Myklebust | e2fecb2 | 2012-01-06 08:57:46 -0500 | [diff] [blame] | 1089 | int status = data->task.tk_status; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1090 | |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1091 | if ((status >= 0) && nfs_write_need_commit(data)) { |
| 1092 | spin_lock(&hdr->lock); |
| 1093 | if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) |
| 1094 | ; /* Do nothing */ |
| 1095 | else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) |
Anna Schumaker | f79d06f | 2014-05-06 09:12:28 -0400 | [diff] [blame] | 1096 | memcpy(&hdr->verf, &data->verf, sizeof(hdr->verf)); |
| 1097 | else if (memcmp(&hdr->verf, &data->verf, sizeof(hdr->verf))) |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1098 | set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags); |
| 1099 | spin_unlock(&hdr->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | } |
| 1101 | } |
| 1102 | |
Trond Myklebust | 1f2edbe | 2014-04-13 11:11:31 -0400 | [diff] [blame] | 1103 | /* |
| 1104 | * Special version of should_remove_suid() that ignores capabilities. |
| 1105 | */ |
| 1106 | static int nfs_should_remove_suid(const struct inode *inode) |
| 1107 | { |
| 1108 | umode_t mode = inode->i_mode; |
| 1109 | int kill = 0; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1110 | |
Trond Myklebust | 1f2edbe | 2014-04-13 11:11:31 -0400 | [diff] [blame] | 1111 | /* suid always must be killed */ |
| 1112 | if (unlikely(mode & S_ISUID)) |
| 1113 | kill = ATTR_KILL_SUID; |
| 1114 | |
| 1115 | /* |
| 1116 | * sgid without any exec bits is just a mandatory locking mark; leave |
| 1117 | * it alone. If some exec bits are set, it's a real sgid; kill it. |
| 1118 | */ |
| 1119 | if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) |
| 1120 | kill |= ATTR_KILL_SGID; |
| 1121 | |
| 1122 | if (unlikely(kill && S_ISREG(mode))) |
| 1123 | return kill; |
| 1124 | |
| 1125 | return 0; |
| 1126 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | /* |
| 1129 | * This function is called when the WRITE call is complete. |
| 1130 | */ |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 1131 | static int nfs_writeback_done(struct rpc_task *task, struct nfs_pgio_data *data, |
| 1132 | struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | { |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1134 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | |
Chuck Lever | f551e44 | 2006-09-20 14:33:04 -0400 | [diff] [blame] | 1136 | /* |
| 1137 | * ->write_done will attempt to use post-op attributes to detect |
| 1138 | * conflicting writes by other clients. A strict interpretation |
| 1139 | * of close-to-open would allow us to continue caching even if |
| 1140 | * another writer had changed the file, but some applications |
| 1141 | * depend on tighter cache coherency when writing. |
| 1142 | */ |
Fred Isaman | cd84160 | 2012-04-20 14:47:44 -0400 | [diff] [blame] | 1143 | status = NFS_PROTO(inode)->write_done(task, data); |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1144 | if (status != 0) |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 1145 | return status; |
| 1146 | nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, data->res.count); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1147 | |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 1148 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 1149 | if (data->res.verf->committed < data->args.stable && task->tk_status >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | /* We tried a write call, but the server did not |
| 1151 | * commit data to stable storage even though we |
| 1152 | * requested it. |
| 1153 | * Note: There is a known bug in Tru64 < 5.0 in which |
| 1154 | * the server reports NFS_DATA_SYNC, but performs |
| 1155 | * NFS_FILE_SYNC. We therefore implement this checking |
| 1156 | * as a dprintk() in order to avoid filling syslog. |
| 1157 | */ |
| 1158 | static unsigned long complain; |
| 1159 | |
Fred Isaman | a69aef1 | 2011-03-03 15:13:47 +0000 | [diff] [blame] | 1160 | /* Note this will print the MDS for a DS write */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | if (time_before(complain, jiffies)) { |
Chuck Lever | 48186c7 | 2008-06-11 17:56:05 -0400 | [diff] [blame] | 1162 | dprintk("NFS: faulty NFS server %s:" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | " (committed = %d) != (stable = %d)\n", |
Fred Isaman | cd84160 | 2012-04-20 14:47:44 -0400 | [diff] [blame] | 1164 | NFS_SERVER(inode)->nfs_client->cl_hostname, |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 1165 | data->res.verf->committed, data->args.stable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | complain = jiffies + 300 * HZ; |
| 1167 | } |
| 1168 | } |
| 1169 | #endif |
Trond Myklebust | 1f2edbe | 2014-04-13 11:11:31 -0400 | [diff] [blame] | 1170 | |
| 1171 | /* Deal with the suid/sgid bit corner case */ |
| 1172 | if (nfs_should_remove_suid(inode)) |
| 1173 | nfs_mark_for_revalidate(inode); |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 1174 | return 0; |
| 1175 | } |
| 1176 | |
| 1177 | /* |
| 1178 | * This function is called when the WRITE call is complete. |
| 1179 | */ |
| 1180 | static void nfs_writeback_result(struct rpc_task *task, struct nfs_pgio_data *data) |
| 1181 | { |
| 1182 | struct nfs_pgio_args *argp = &data->args; |
| 1183 | struct nfs_pgio_res *resp = &data->res; |
Trond Myklebust | 1f2edbe | 2014-04-13 11:11:31 -0400 | [diff] [blame] | 1184 | |
| 1185 | if (resp->count < argp->count) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | static unsigned long complain; |
| 1187 | |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1188 | /* This a short write! */ |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 1189 | nfs_inc_stats(data->header->inode, NFSIOS_SHORTWRITE); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | /* Has the server at least made some progress? */ |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1192 | if (resp->count == 0) { |
| 1193 | if (time_before(complain, jiffies)) { |
| 1194 | printk(KERN_WARNING |
| 1195 | "NFS: Server wrote zero bytes, expected %u.\n", |
| 1196 | argp->count); |
| 1197 | complain = jiffies + 300 * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | } |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1199 | nfs_set_pgio_error(data->header, -EIO, argp->offset); |
| 1200 | task->tk_status = -EIO; |
Fred Isaman | 1360289 | 2011-02-11 15:42:38 +0000 | [diff] [blame] | 1201 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | } |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1203 | /* Was this an NFSv2 write or an NFSv3 stable write? */ |
| 1204 | if (resp->verf->committed != NFS_UNSTABLE) { |
| 1205 | /* Resend from where the server left off */ |
| 1206 | data->mds_offset += resp->count; |
| 1207 | argp->offset += resp->count; |
| 1208 | argp->pgbase += resp->count; |
| 1209 | argp->count -= resp->count; |
| 1210 | } else { |
| 1211 | /* Resend as a stable write in order to avoid |
| 1212 | * headaches in the case of a server crash. |
| 1213 | */ |
| 1214 | argp->stable = NFS_FILE_SYNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | } |
Fred Isaman | 6c75dc0 | 2012-04-20 14:47:47 -0400 | [diff] [blame] | 1216 | rpc_restart_call_prepare(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | } |
| 1219 | |
| 1220 | |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 1221 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1222 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
| 1223 | { |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1224 | int ret; |
| 1225 | |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1226 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
| 1227 | return 1; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1228 | if (!may_wait) |
| 1229 | return 0; |
| 1230 | ret = out_of_line_wait_on_bit_lock(&nfsi->flags, |
| 1231 | NFS_INO_COMMIT, |
| 1232 | nfs_wait_bit_killable, |
| 1233 | TASK_KILLABLE); |
| 1234 | return (ret < 0) ? ret : 1; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1235 | } |
| 1236 | |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1237 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1238 | { |
| 1239 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 1240 | smp_mb__after_atomic(); |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1241 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); |
| 1242 | } |
| 1243 | |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1244 | void nfs_commitdata_release(struct nfs_commit_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | { |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1246 | put_nfs_open_context(data->context); |
| 1247 | nfs_commit_free(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1249 | EXPORT_SYMBOL_GPL(nfs_commitdata_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1251 | int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1252 | const struct rpc_call_ops *call_ops, |
Andy Adamson | 9f0ec176 | 2012-04-27 17:53:44 -0400 | [diff] [blame] | 1253 | int how, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1255 | struct rpc_task *task; |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1256 | int priority = flush_task_priority(how); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1257 | struct rpc_message msg = { |
| 1258 | .rpc_argp = &data->args, |
| 1259 | .rpc_resp = &data->res, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1260 | .rpc_cred = data->cred, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1261 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1262 | struct rpc_task_setup task_setup_data = { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1263 | .task = &data->task, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1264 | .rpc_client = clnt, |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1265 | .rpc_message = &msg, |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1266 | .callback_ops = call_ops, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1267 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 1268 | .workqueue = nfsiod_workqueue, |
Andy Adamson | 9f0ec176 | 2012-04-27 17:53:44 -0400 | [diff] [blame] | 1269 | .flags = RPC_TASK_ASYNC | flags, |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1270 | .priority = priority, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1271 | }; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1272 | /* Set up the initial task struct. */ |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1273 | NFS_PROTO(data->inode)->commit_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1275 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 1276 | |
Weston Andros Adamson | 8c21c62 | 2013-08-13 16:37:37 -0400 | [diff] [blame] | 1277 | nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client, |
| 1278 | NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg); |
| 1279 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 1280 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1281 | if (IS_ERR(task)) |
| 1282 | return PTR_ERR(task); |
Jeff Layton | d2224e7 | 2011-03-06 17:14:13 +0000 | [diff] [blame] | 1283 | if (how & FLUSH_SYNC) |
| 1284 | rpc_wait_for_completion_task(task); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 1285 | rpc_put_task(task); |
| 1286 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1288 | EXPORT_SYMBOL_GPL(nfs_initiate_commit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
| 1290 | /* |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1291 | * Set up the argument/result storage required for the RPC call. |
| 1292 | */ |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1293 | void nfs_init_commit(struct nfs_commit_data *data, |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1294 | struct list_head *head, |
| 1295 | struct pnfs_layout_segment *lseg, |
| 1296 | struct nfs_commit_info *cinfo) |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1297 | { |
| 1298 | struct nfs_page *first = nfs_list_entry(head->next); |
Al Viro | 3d4ff43 | 2011-06-22 18:40:12 -0400 | [diff] [blame] | 1299 | struct inode *inode = first->wb_context->dentry->d_inode; |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1300 | |
| 1301 | /* Set up the RPC argument and reply structs |
| 1302 | * NB: take care not to mess about with data->commit et al. */ |
| 1303 | |
| 1304 | list_splice_init(head, &data->pages); |
| 1305 | |
| 1306 | data->inode = inode; |
| 1307 | data->cred = first->wb_context->cred; |
Fred Isaman | 988b6dc | 2011-03-23 13:27:52 +0000 | [diff] [blame] | 1308 | data->lseg = lseg; /* reference transferred */ |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1309 | data->mds_ops = &nfs_commit_ops; |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1310 | data->completion_ops = cinfo->completion_ops; |
Fred Isaman | b359f9d | 2012-04-20 14:47:55 -0400 | [diff] [blame] | 1311 | data->dreq = cinfo->dreq; |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1312 | |
| 1313 | data->args.fh = NFS_FH(data->inode); |
| 1314 | /* Note: we always request a commit of the entire inode */ |
| 1315 | data->args.offset = 0; |
| 1316 | data->args.count = 0; |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1317 | data->context = get_nfs_open_context(first->wb_context); |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1318 | data->res.fattr = &data->fattr; |
| 1319 | data->res.verf = &data->verf; |
| 1320 | nfs_fattr_init(&data->fattr); |
| 1321 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1322 | EXPORT_SYMBOL_GPL(nfs_init_commit); |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1323 | |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1324 | void nfs_retry_commit(struct list_head *page_list, |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1325 | struct pnfs_layout_segment *lseg, |
| 1326 | struct nfs_commit_info *cinfo) |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1327 | { |
| 1328 | struct nfs_page *req; |
| 1329 | |
| 1330 | while (!list_empty(page_list)) { |
| 1331 | req = nfs_list_entry(page_list->next); |
| 1332 | nfs_list_remove_request(req); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1333 | nfs_mark_request_commit(req, lseg, cinfo); |
Fred Isaman | 56f9cd6 | 2012-04-20 14:47:56 -0400 | [diff] [blame] | 1334 | if (!cinfo->dreq) { |
| 1335 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 1336 | dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, |
Fred Isaman | 56f9cd6 | 2012-04-20 14:47:56 -0400 | [diff] [blame] | 1337 | BDI_RECLAIMABLE); |
| 1338 | } |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 1339 | nfs_unlock_and_release_request(req); |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1340 | } |
| 1341 | } |
Fred Isaman | e0c2b38 | 2011-03-23 13:27:53 +0000 | [diff] [blame] | 1342 | EXPORT_SYMBOL_GPL(nfs_retry_commit); |
Fred Isaman | 64bfeb4 | 2011-03-23 13:27:47 +0000 | [diff] [blame] | 1343 | |
Fred Isaman | 9ace33c | 2011-03-23 13:27:45 +0000 | [diff] [blame] | 1344 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | * Commit dirty pages |
| 1346 | */ |
| 1347 | static int |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1348 | nfs_commit_list(struct inode *inode, struct list_head *head, int how, |
| 1349 | struct nfs_commit_info *cinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | { |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1351 | struct nfs_commit_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1353 | data = nfs_commitdata_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
| 1355 | if (!data) |
| 1356 | goto out_bad; |
| 1357 | |
| 1358 | /* Set up the argument struct */ |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1359 | nfs_init_commit(data, head, NULL, cinfo); |
| 1360 | atomic_inc(&cinfo->mds->rpcs_out); |
Andy Adamson | 9f0ec176 | 2012-04-27 17:53:44 -0400 | [diff] [blame] | 1361 | return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops, |
| 1362 | how, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | out_bad: |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1364 | nfs_retry_commit(head, NULL, cinfo); |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1365 | cinfo->completion_ops->error_cleanup(NFS_I(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | return -ENOMEM; |
| 1367 | } |
| 1368 | |
| 1369 | /* |
| 1370 | * COMMIT call returned |
| 1371 | */ |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1372 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | { |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1374 | struct nfs_commit_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 1376 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | task->tk_pid, task->tk_status); |
| 1378 | |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1379 | /* Call the NFS version-specific code */ |
Trond Myklebust | c0d0e96 | 2011-04-12 12:29:15 -0400 | [diff] [blame] | 1380 | NFS_PROTO(data->inode)->commit_done(task, data); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1381 | } |
| 1382 | |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1383 | static void nfs_commit_release_pages(struct nfs_commit_data *data) |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1384 | { |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1385 | struct nfs_page *req; |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1386 | int status = data->task.tk_status; |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1387 | struct nfs_commit_info cinfo; |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | while (!list_empty(&data->pages)) { |
| 1390 | req = nfs_list_entry(data->pages.next); |
| 1391 | nfs_list_remove_request(req); |
Fred Isaman | d6d6dc7 | 2012-03-08 17:29:35 -0500 | [diff] [blame] | 1392 | nfs_clear_page_commit(req->wb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
Niels de Vos | 1e8968c | 2013-12-17 18:20:16 +0100 | [diff] [blame] | 1394 | dprintk("NFS: commit (%s/%llu %d@%lld)", |
Al Viro | 3d4ff43 | 2011-06-22 18:40:12 -0400 | [diff] [blame] | 1395 | req->wb_context->dentry->d_sb->s_id, |
Niels de Vos | 1e8968c | 2013-12-17 18:20:16 +0100 | [diff] [blame] | 1396 | (unsigned long long)NFS_FILEID(req->wb_context->dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | req->wb_bytes, |
| 1398 | (long long)req_offset(req)); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1399 | if (status < 0) { |
| 1400 | nfs_context_set_write_error(req->wb_context, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | nfs_inode_remove_request(req); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1402 | dprintk(", error = %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | goto next; |
| 1404 | } |
| 1405 | |
| 1406 | /* Okay, COMMIT succeeded, apparently. Check the verifier |
| 1407 | * returned by the server against all stored verfs. */ |
Trond Myklebust | 2f2c63b | 2012-06-08 11:56:09 -0400 | [diff] [blame] | 1408 | if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | /* We have a match */ |
| 1410 | nfs_inode_remove_request(req); |
| 1411 | dprintk(" OK\n"); |
| 1412 | goto next; |
| 1413 | } |
| 1414 | /* We have a mismatch. Write the page again */ |
| 1415 | dprintk(" mismatch\n"); |
Fred | 6d884e8 | 2008-03-19 11:24:38 -0400 | [diff] [blame] | 1416 | nfs_mark_request_dirty(req); |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 1417 | set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | next: |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 1419 | nfs_unlock_and_release_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | } |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1421 | nfs_init_cinfo(&cinfo, data->inode, data->dreq); |
| 1422 | if (atomic_dec_and_test(&cinfo.mds->rpcs_out)) |
| 1423 | nfs_commit_clear_lock(NFS_I(data->inode)); |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1424 | } |
| 1425 | |
| 1426 | static void nfs_commit_release(void *calldata) |
| 1427 | { |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1428 | struct nfs_commit_data *data = calldata; |
Fred Isaman | 5917ce8 | 2011-03-23 13:27:48 +0000 | [diff] [blame] | 1429 | |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1430 | data->completion_ops->completion(data); |
Trond Myklebust | c9d8f89 | 2008-04-15 16:56:39 -0400 | [diff] [blame] | 1431 | nfs_commitdata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | } |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1433 | |
| 1434 | static const struct rpc_call_ops nfs_commit_ops = { |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1435 | .rpc_call_prepare = nfs_commit_prepare, |
Trond Myklebust | 788e7a8 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 1436 | .rpc_call_done = nfs_commit_done, |
| 1437 | .rpc_release = nfs_commit_release, |
| 1438 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | |
Fred Isaman | f453a54 | 2012-04-20 14:47:54 -0400 | [diff] [blame] | 1440 | static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { |
| 1441 | .completion = nfs_commit_release_pages, |
| 1442 | .error_cleanup = nfs_commit_clear_lock, |
| 1443 | }; |
| 1444 | |
Fred Isaman | 1763da1 | 2012-04-20 14:47:57 -0400 | [diff] [blame] | 1445 | int nfs_generic_commit_list(struct inode *inode, struct list_head *head, |
| 1446 | int how, struct nfs_commit_info *cinfo) |
Fred Isaman | 84c53ab | 2012-04-20 14:47:52 -0400 | [diff] [blame] | 1447 | { |
| 1448 | int status; |
| 1449 | |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1450 | status = pnfs_commit_list(inode, head, how, cinfo); |
Fred Isaman | 84c53ab | 2012-04-20 14:47:52 -0400 | [diff] [blame] | 1451 | if (status == PNFS_NOT_ATTEMPTED) |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1452 | status = nfs_commit_list(inode, head, how, cinfo); |
Fred Isaman | 84c53ab | 2012-04-20 14:47:52 -0400 | [diff] [blame] | 1453 | return status; |
| 1454 | } |
| 1455 | |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 1456 | int nfs_commit_inode(struct inode *inode, int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | LIST_HEAD(head); |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1459 | struct nfs_commit_info cinfo; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1460 | int may_wait = how & FLUSH_SYNC; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1461 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1463 | res = nfs_commit_set_lock(NFS_I(inode), may_wait); |
| 1464 | if (res <= 0) |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1465 | goto out_mark_dirty; |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1466 | nfs_init_cinfo_from_inode(&cinfo, inode); |
| 1467 | res = nfs_scan_commit(inode, &head, &cinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | if (res) { |
Fred Isaman | a861a1e | 2011-03-23 13:27:51 +0000 | [diff] [blame] | 1469 | int error; |
| 1470 | |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1471 | error = nfs_generic_commit_list(inode, &head, how, &cinfo); |
Trond Myklebust | 3da28eb | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 1472 | if (error < 0) |
| 1473 | return error; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1474 | if (!may_wait) |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1475 | goto out_mark_dirty; |
Trond Myklebust | b8413f9 | 2011-03-21 15:37:01 -0400 | [diff] [blame] | 1476 | error = wait_on_bit(&NFS_I(inode)->flags, |
| 1477 | NFS_INO_COMMIT, |
| 1478 | nfs_wait_bit_killable, |
| 1479 | TASK_KILLABLE); |
| 1480 | if (error < 0) |
| 1481 | return error; |
Trond Myklebust | 71d0a61 | 2010-04-22 15:35:57 -0400 | [diff] [blame] | 1482 | } else |
| 1483 | nfs_commit_clear_lock(NFS_I(inode)); |
Trond Myklebust | c5efa5f | 2010-05-26 08:42:11 -0400 | [diff] [blame] | 1484 | return res; |
| 1485 | /* Note: If we exit without ensuring that the commit is complete, |
| 1486 | * we must mark the inode as dirty. Otherwise, future calls to |
| 1487 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure |
| 1488 | * that the data is on the disk. |
| 1489 | */ |
| 1490 | out_mark_dirty: |
| 1491 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | return res; |
| 1493 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1494 | |
| 1495 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1496 | { |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1497 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1498 | int flags = FLUSH_SYNC; |
| 1499 | int ret = 0; |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1500 | |
Jeff Layton | 3236c3e | 2011-10-11 09:49:21 -0400 | [diff] [blame] | 1501 | /* no commits means nothing needs to be done */ |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1502 | if (!nfsi->commit_info.ncommit) |
Jeff Layton | 3236c3e | 2011-10-11 09:49:21 -0400 | [diff] [blame] | 1503 | return ret; |
| 1504 | |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1505 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 1506 | /* Don't commit yet if this is a non-blocking flush and there |
| 1507 | * are a lot of outstanding writes for this mapping. |
| 1508 | */ |
Fred Isaman | ea2cf22 | 2012-04-20 14:47:53 -0400 | [diff] [blame] | 1509 | if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1)) |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1510 | goto out_mark_dirty; |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1511 | |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1512 | /* don't wait for the COMMIT response */ |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1513 | flags = 0; |
Jeff Layton | a00dd6c | 2010-09-28 09:14:01 -0400 | [diff] [blame] | 1514 | } |
| 1515 | |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1516 | ret = nfs_commit_inode(inode, flags); |
| 1517 | if (ret >= 0) { |
| 1518 | if (wbc->sync_mode == WB_SYNC_NONE) { |
| 1519 | if (ret < wbc->nr_to_write) |
| 1520 | wbc->nr_to_write -= ret; |
| 1521 | else |
| 1522 | wbc->nr_to_write = 0; |
| 1523 | } |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1524 | return 0; |
Trond Myklebust | 420e364 | 2010-02-19 17:00:02 -0800 | [diff] [blame] | 1525 | } |
| 1526 | out_mark_dirty: |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1527 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
| 1528 | return ret; |
| 1529 | } |
Trond Myklebust | c63c7b0 | 2007-04-02 19:29:52 -0400 | [diff] [blame] | 1530 | #else |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1531 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
| 1532 | { |
| 1533 | return 0; |
| 1534 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | #endif |
| 1536 | |
Trond Myklebust | 8fc795f | 2010-02-19 16:46:56 -0800 | [diff] [blame] | 1537 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 1538 | { |
Bryan Schumaker | a8d8f02 | 2012-06-20 15:53:49 -0400 | [diff] [blame] | 1539 | return nfs_commit_unstable_pages(inode, wbc); |
| 1540 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 1541 | EXPORT_SYMBOL_GPL(nfs_write_inode); |
Andy Adamson | 863a3c6 | 2011-03-23 13:27:54 +0000 | [diff] [blame] | 1542 | |
Trond Myklebust | acdc53b | 2010-02-19 17:03:26 -0800 | [diff] [blame] | 1543 | /* |
| 1544 | * flush the inode to disk. |
| 1545 | */ |
| 1546 | int nfs_wb_all(struct inode *inode) |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1547 | { |
| 1548 | struct writeback_control wbc = { |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 1549 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1550 | .nr_to_write = LONG_MAX, |
Trond Myklebust | d7fb120 | 2008-10-06 20:08:56 -0400 | [diff] [blame] | 1551 | .range_start = 0, |
| 1552 | .range_end = LLONG_MAX, |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1553 | }; |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 1554 | int ret; |
Trond Myklebust | 34901f7 | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 1555 | |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 1556 | trace_nfs_writeback_inode_enter(inode); |
| 1557 | |
| 1558 | ret = sync_inode(inode, &wbc); |
| 1559 | |
| 1560 | trace_nfs_writeback_inode_exit(inode, ret); |
| 1561 | return ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1562 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1563 | EXPORT_SYMBOL_GPL(nfs_wb_all); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1564 | |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1565 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
| 1566 | { |
| 1567 | struct nfs_page *req; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1568 | int ret = 0; |
| 1569 | |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1570 | for (;;) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1571 | wait_on_page_writeback(page); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1572 | req = nfs_page_find_request(page); |
| 1573 | if (req == NULL) |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1574 | break; |
Trond Myklebust | 7ad84aa | 2012-05-09 13:19:15 -0400 | [diff] [blame] | 1575 | if (nfs_lock_request(req)) { |
Trond Myklebust | 8dd3775 | 2012-03-15 17:16:40 -0400 | [diff] [blame] | 1576 | nfs_clear_request_commit(req); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1577 | nfs_inode_remove_request(req); |
| 1578 | /* |
| 1579 | * In case nfs_inode_remove_request has marked the |
| 1580 | * page as being dirty |
| 1581 | */ |
| 1582 | cancel_dirty_page(page, PAGE_CACHE_SIZE); |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 1583 | nfs_unlock_and_release_request(req); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1584 | break; |
| 1585 | } |
| 1586 | ret = nfs_wait_on_request(req); |
Trond Myklebust | c9edda7 | 2010-01-26 15:41:34 -0500 | [diff] [blame] | 1587 | nfs_release_request(req); |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1588 | if (ret < 0) |
Trond Myklebust | c988950 | 2010-02-19 17:03:21 -0800 | [diff] [blame] | 1589 | break; |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1590 | } |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 1591 | return ret; |
| 1592 | } |
| 1593 | |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1594 | /* |
| 1595 | * Write back all requests on one page - we do this before reading it. |
| 1596 | */ |
| 1597 | int nfs_wb_page(struct inode *inode, struct page *page) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1598 | { |
Mel Gorman | 29418aa | 2012-07-31 16:45:10 -0700 | [diff] [blame] | 1599 | loff_t range_start = page_file_offset(page); |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1600 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1601 | struct writeback_control wbc = { |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1602 | .sync_mode = WB_SYNC_ALL, |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1603 | .nr_to_write = 0, |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1604 | .range_start = range_start, |
| 1605 | .range_end = range_end, |
| 1606 | }; |
| 1607 | int ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1608 | |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 1609 | trace_nfs_writeback_page_enter(inode); |
| 1610 | |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1611 | for (;;) { |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1612 | wait_on_page_writeback(page); |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1613 | if (clear_page_dirty_for_io(page)) { |
| 1614 | ret = nfs_writepage_locked(page, &wbc); |
| 1615 | if (ret < 0) |
| 1616 | goto out_error; |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1617 | continue; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1618 | } |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 1619 | ret = 0; |
Trond Myklebust | 0522f6a | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1620 | if (!PagePrivate(page)) |
| 1621 | break; |
| 1622 | ret = nfs_commit_inode(inode, FLUSH_SYNC); |
Trond Myklebust | ba8b06e | 2010-04-27 18:33:54 -0400 | [diff] [blame] | 1623 | if (ret < 0) |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1624 | goto out_error; |
Trond Myklebust | 7f2f12d | 2010-02-19 17:03:28 -0800 | [diff] [blame] | 1625 | } |
Trond Myklebust | 73e3302 | 2008-04-11 16:03:54 -0400 | [diff] [blame] | 1626 | out_error: |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 1627 | trace_nfs_writeback_page_exit(inode, ret); |
Trond Myklebust | 4d770cc | 2006-12-05 00:35:41 -0500 | [diff] [blame] | 1628 | return ret; |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 1629 | } |
| 1630 | |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1631 | #ifdef CONFIG_MIGRATION |
| 1632 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 1633 | struct page *page, enum migrate_mode mode) |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1634 | { |
Jeff Layton | 2da9565 | 2011-10-12 10:57:42 -0400 | [diff] [blame] | 1635 | /* |
| 1636 | * If PagePrivate is set, then the page is currently associated with |
| 1637 | * an in-progress read or write request. Don't try to migrate it. |
| 1638 | * |
| 1639 | * FIXME: we could do this in principle, but we'll need a way to ensure |
| 1640 | * that we can safely release the inode reference while holding |
| 1641 | * the page lock. |
| 1642 | */ |
| 1643 | if (PagePrivate(page)) |
| 1644 | return -EBUSY; |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1645 | |
David Howells | 8c209ce | 2012-12-05 13:34:49 +0000 | [diff] [blame] | 1646 | if (!nfs_fscache_release_page(page, GFP_KERNEL)) |
| 1647 | return -EBUSY; |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1648 | |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 1649 | return migrate_page(mapping, newpage, page, mode); |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 1650 | } |
| 1651 | #endif |
| 1652 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 1653 | int __init nfs_init_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | { |
| 1655 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", |
Anna Schumaker | c0752cd | 2014-05-06 09:12:27 -0400 | [diff] [blame] | 1656 | sizeof(struct nfs_rw_header), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1658 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | if (nfs_wdata_cachep == NULL) |
| 1660 | return -ENOMEM; |
| 1661 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1662 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
| 1663 | nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | if (nfs_wdata_mempool == NULL) |
Jeff Layton | 3dd4765 | 2012-08-02 14:30:56 -0400 | [diff] [blame] | 1665 | goto out_destroy_write_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1667 | nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", |
| 1668 | sizeof(struct nfs_commit_data), |
| 1669 | 0, SLAB_HWCACHE_ALIGN, |
| 1670 | NULL); |
| 1671 | if (nfs_cdata_cachep == NULL) |
Jeff Layton | 3dd4765 | 2012-08-02 14:30:56 -0400 | [diff] [blame] | 1672 | goto out_destroy_write_mempool; |
Fred Isaman | 0b7c015 | 2012-04-20 14:47:39 -0400 | [diff] [blame] | 1673 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1674 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
Yanchuan Nian | 4c10021 | 2012-11-12 09:27:37 +0800 | [diff] [blame] | 1675 | nfs_cdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | if (nfs_commit_mempool == NULL) |
Jeff Layton | 3dd4765 | 2012-08-02 14:30:56 -0400 | [diff] [blame] | 1677 | goto out_destroy_commit_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Jeff Layton | 3dd4765 | 2012-08-02 14:30:56 -0400 | [diff] [blame] | 1700 | |
| 1701 | out_destroy_commit_cache: |
| 1702 | kmem_cache_destroy(nfs_cdata_cachep); |
| 1703 | out_destroy_write_mempool: |
| 1704 | mempool_destroy(nfs_wdata_mempool); |
| 1705 | out_destroy_write_cache: |
| 1706 | kmem_cache_destroy(nfs_wdata_cachep); |
| 1707 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | } |
| 1709 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 1710 | void nfs_destroy_writepagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | { |
| 1712 | mempool_destroy(nfs_commit_mempool); |
Jeff Layton | 3dd4765 | 2012-08-02 14:30:56 -0400 | [diff] [blame] | 1713 | kmem_cache_destroy(nfs_cdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | mempool_destroy(nfs_wdata_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1715 | kmem_cache_destroy(nfs_wdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | } |
| 1717 | |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 1718 | static const struct nfs_rw_ops nfs_rw_write_ops = { |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 1719 | .rw_mode = FMODE_WRITE, |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 1720 | .rw_alloc_header = nfs_writehdr_alloc, |
| 1721 | .rw_free_header = nfs_writehdr_free, |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 1722 | .rw_release = nfs_writeback_release_common, |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 1723 | .rw_done = nfs_writeback_done, |
| 1724 | .rw_result = nfs_writeback_result, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 1725 | .rw_initiate = nfs_initiate_write, |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 1726 | }; |