Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
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> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
1da177e4 LT |
16 | |
17 | #include <linux/sunrpc/clnt.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_mount.h> | |
20 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
21 | #include <linux/backing-dev.h> |
22 | ||
1da177e4 | 23 | #include <asm/uaccess.h> |
1da177e4 LT |
24 | |
25 | #include "delegation.h" | |
49a70f27 | 26 | #include "internal.h" |
91d5b470 | 27 | #include "iostat.h" |
1da177e4 LT |
28 | |
29 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
30 | ||
31 | #define MIN_POOL_WRITE (32) | |
32 | #define MIN_POOL_COMMIT (4) | |
33 | ||
34 | /* | |
35 | * Local function declarations | |
36 | */ | |
37 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
38 | struct page *, |
39 | unsigned int, unsigned int); | |
c63c7b05 TM |
40 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
41 | struct inode *inode, int ioflags); | |
788e7a89 TM |
42 | static const struct rpc_call_ops nfs_write_partial_ops; |
43 | static const struct rpc_call_ops nfs_write_full_ops; | |
44 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 45 | |
e18b890b | 46 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 47 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
48 | static mempool_t *nfs_commit_mempool; |
49 | ||
e9f7bee1 | 50 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 | 51 | { |
e6b4f8da | 52 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 53 | |
1da177e4 LT |
54 | if (p) { |
55 | memset(p, 0, sizeof(*p)); | |
56 | INIT_LIST_HEAD(&p->pages); | |
57 | } | |
58 | return p; | |
59 | } | |
60 | ||
10afec90 | 61 | static void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 62 | { |
8aca67f0 | 63 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
64 | if (p && (p->pagevec != &p->page_array[0])) |
65 | kfree(p->pagevec); | |
1da177e4 LT |
66 | mempool_free(p, nfs_commit_mempool); |
67 | } | |
68 | ||
8aca67f0 TM |
69 | void nfs_commit_free(struct nfs_write_data *wdata) |
70 | { | |
71 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
72 | } | |
73 | ||
8d5658c9 | 74 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 75 | { |
e6b4f8da | 76 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
77 | |
78 | if (p) { | |
79 | memset(p, 0, sizeof(*p)); | |
80 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 81 | p->npages = pagecount; |
0d0b5cb3 CL |
82 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
83 | p->pagevec = p->page_array; | |
3feb2d49 | 84 | else { |
0d0b5cb3 CL |
85 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
86 | if (!p->pagevec) { | |
3feb2d49 TM |
87 | mempool_free(p, nfs_wdata_mempool); |
88 | p = NULL; | |
89 | } | |
90 | } | |
91 | } | |
92 | return p; | |
93 | } | |
94 | ||
8aca67f0 | 95 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 96 | { |
8aca67f0 | 97 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
98 | if (p && (p->pagevec != &p->page_array[0])) |
99 | kfree(p->pagevec); | |
100 | mempool_free(p, nfs_wdata_mempool); | |
101 | } | |
102 | ||
8aca67f0 TM |
103 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
104 | { | |
105 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
106 | } | |
107 | ||
963d8fe5 | 108 | void nfs_writedata_release(void *wdata) |
1da177e4 | 109 | { |
1da177e4 LT |
110 | nfs_writedata_free(wdata); |
111 | } | |
112 | ||
277459d2 TM |
113 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
114 | { | |
115 | struct nfs_page *req = NULL; | |
116 | ||
117 | if (PagePrivate(page)) { | |
118 | req = (struct nfs_page *)page_private(page); | |
119 | if (req != NULL) | |
c03b4024 | 120 | kref_get(&req->wb_kref); |
277459d2 TM |
121 | } |
122 | return req; | |
123 | } | |
124 | ||
125 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
126 | { | |
587142f8 | 127 | struct inode *inode = page->mapping->host; |
277459d2 | 128 | struct nfs_page *req = NULL; |
277459d2 | 129 | |
587142f8 | 130 | spin_lock(&inode->i_lock); |
277459d2 | 131 | req = nfs_page_find_request_locked(page); |
587142f8 | 132 | spin_unlock(&inode->i_lock); |
277459d2 TM |
133 | return req; |
134 | } | |
135 | ||
1da177e4 LT |
136 | /* Adjust the file length if we're writing beyond the end */ |
137 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
138 | { | |
139 | struct inode *inode = page->mapping->host; | |
140 | loff_t end, i_size = i_size_read(inode); | |
ca52fec1 | 141 | pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
142 | |
143 | if (i_size > 0 && page->index < end_index) | |
144 | return; | |
145 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
146 | if (i_size >= end) | |
147 | return; | |
91d5b470 | 148 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
149 | i_size_write(inode, end); |
150 | } | |
151 | ||
a301b777 TM |
152 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
153 | static void nfs_set_pageerror(struct page *page) | |
154 | { | |
155 | SetPageError(page); | |
156 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
157 | } | |
158 | ||
1da177e4 LT |
159 | /* We can set the PG_uptodate flag if we see that a write request |
160 | * covers the full page. | |
161 | */ | |
162 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
163 | { | |
1da177e4 LT |
164 | if (PageUptodate(page)) |
165 | return; | |
166 | if (base != 0) | |
167 | return; | |
49a70f27 | 168 | if (count != nfs_page_length(page)) |
1da177e4 | 169 | return; |
49a70f27 | 170 | if (count != PAGE_CACHE_SIZE) |
60945cb7 | 171 | zero_user_page(page, count, PAGE_CACHE_SIZE - count, KM_USER0); |
49a70f27 | 172 | SetPageUptodate(page); |
1da177e4 LT |
173 | } |
174 | ||
e21195a7 | 175 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
176 | unsigned int offset, unsigned int count) |
177 | { | |
178 | struct nfs_page *req; | |
e21195a7 | 179 | int ret; |
1da177e4 | 180 | |
e21195a7 TM |
181 | for (;;) { |
182 | req = nfs_update_request(ctx, page, offset, count); | |
183 | if (!IS_ERR(req)) | |
184 | break; | |
185 | ret = PTR_ERR(req); | |
186 | if (ret != -EBUSY) | |
187 | return ret; | |
188 | ret = nfs_wb_page(page->mapping->host, page); | |
189 | if (ret != 0) | |
190 | return ret; | |
191 | } | |
1da177e4 LT |
192 | /* Update file length */ |
193 | nfs_grow_file(page, offset, count); | |
1da177e4 | 194 | nfs_unlock_request(req); |
abd3e641 | 195 | return 0; |
1da177e4 LT |
196 | } |
197 | ||
198 | static int wb_priority(struct writeback_control *wbc) | |
199 | { | |
200 | if (wbc->for_reclaim) | |
c63c7b05 | 201 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
1da177e4 LT |
202 | if (wbc->for_kupdate) |
203 | return FLUSH_LOWPRI; | |
204 | return 0; | |
205 | } | |
206 | ||
89a09141 PZ |
207 | /* |
208 | * NFS congestion control | |
209 | */ | |
210 | ||
211 | int nfs_congestion_kb; | |
212 | ||
213 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
214 | #define NFS_CONGESTION_OFF_THRESH \ | |
215 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
216 | ||
5a6d41b3 | 217 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 218 | { |
5a6d41b3 TM |
219 | int ret = test_set_page_writeback(page); |
220 | ||
221 | if (!ret) { | |
89a09141 PZ |
222 | struct inode *inode = page->mapping->host; |
223 | struct nfs_server *nfss = NFS_SERVER(inode); | |
224 | ||
277866a0 | 225 | if (atomic_long_inc_return(&nfss->writeback) > |
89a09141 PZ |
226 | NFS_CONGESTION_ON_THRESH) |
227 | set_bdi_congested(&nfss->backing_dev_info, WRITE); | |
228 | } | |
5a6d41b3 | 229 | return ret; |
89a09141 PZ |
230 | } |
231 | ||
232 | static void nfs_end_page_writeback(struct page *page) | |
233 | { | |
234 | struct inode *inode = page->mapping->host; | |
235 | struct nfs_server *nfss = NFS_SERVER(inode); | |
236 | ||
237 | end_page_writeback(page); | |
277866a0 | 238 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) { |
89a09141 PZ |
239 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); |
240 | congestion_end(WRITE); | |
241 | } | |
242 | } | |
243 | ||
e261f51f TM |
244 | /* |
245 | * Find an associated nfs write request, and prepare to flush it out | |
9cccef95 | 246 | * May return an error if the user signalled nfs_wait_on_request(). |
e261f51f | 247 | */ |
c63c7b05 TM |
248 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
249 | struct page *page) | |
e261f51f | 250 | { |
587142f8 TM |
251 | struct inode *inode = page->mapping->host; |
252 | struct nfs_inode *nfsi = NFS_I(inode); | |
e261f51f | 253 | struct nfs_page *req; |
e261f51f TM |
254 | int ret; |
255 | ||
587142f8 | 256 | spin_lock(&inode->i_lock); |
e261f51f TM |
257 | for(;;) { |
258 | req = nfs_page_find_request_locked(page); | |
259 | if (req == NULL) { | |
587142f8 | 260 | spin_unlock(&inode->i_lock); |
9cccef95 | 261 | return 0; |
e261f51f TM |
262 | } |
263 | if (nfs_lock_request_dontget(req)) | |
264 | break; | |
265 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
266 | * then the call to nfs_lock_request_dontget() will always | |
267 | * succeed provided that someone hasn't already marked the | |
268 | * request as dirty (in which case we don't care). | |
269 | */ | |
587142f8 | 270 | spin_unlock(&inode->i_lock); |
e261f51f TM |
271 | ret = nfs_wait_on_request(req); |
272 | nfs_release_request(req); | |
273 | if (ret != 0) | |
274 | return ret; | |
587142f8 | 275 | spin_lock(&inode->i_lock); |
e261f51f | 276 | } |
612c9384 TM |
277 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
278 | /* This request is marked for commit */ | |
587142f8 | 279 | spin_unlock(&inode->i_lock); |
612c9384 | 280 | nfs_unlock_request(req); |
c63c7b05 | 281 | nfs_pageio_complete(pgio); |
9cccef95 | 282 | return 0; |
612c9384 | 283 | } |
c63c7b05 | 284 | if (nfs_set_page_writeback(page) != 0) { |
587142f8 | 285 | spin_unlock(&inode->i_lock); |
c63c7b05 TM |
286 | BUG(); |
287 | } | |
288 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, | |
9fd367f0 | 289 | NFS_PAGE_TAG_LOCKED); |
587142f8 | 290 | spin_unlock(&inode->i_lock); |
c63c7b05 | 291 | nfs_pageio_add_request(pgio, req); |
9cccef95 | 292 | return 0; |
e261f51f TM |
293 | } |
294 | ||
f758c885 | 295 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 296 | { |
1da177e4 | 297 | struct inode *inode = page->mapping->host; |
1da177e4 | 298 | |
91d5b470 CL |
299 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
300 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
301 | ||
7fe7f848 | 302 | nfs_pageio_cond_complete(pgio, page->index); |
f758c885 TM |
303 | return nfs_page_async_flush(pgio, page); |
304 | } | |
7fe7f848 | 305 | |
f758c885 TM |
306 | /* |
307 | * Write an mmapped page to the server. | |
308 | */ | |
309 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
310 | { | |
311 | struct nfs_pageio_descriptor pgio; | |
312 | int err; | |
49a70f27 | 313 | |
f758c885 TM |
314 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
315 | err = nfs_do_writepage(page, wbc, &pgio); | |
316 | nfs_pageio_complete(&pgio); | |
317 | if (err < 0) | |
318 | return err; | |
319 | if (pgio.pg_error < 0) | |
320 | return pgio.pg_error; | |
321 | return 0; | |
4d770ccf TM |
322 | } |
323 | ||
324 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
325 | { | |
f758c885 | 326 | int ret; |
4d770ccf | 327 | |
f758c885 | 328 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 329 | unlock_page(page); |
f758c885 TM |
330 | return ret; |
331 | } | |
332 | ||
333 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
334 | { | |
335 | int ret; | |
336 | ||
337 | ret = nfs_do_writepage(page, wbc, data); | |
338 | unlock_page(page); | |
339 | return ret; | |
1da177e4 LT |
340 | } |
341 | ||
1da177e4 LT |
342 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
343 | { | |
1da177e4 | 344 | struct inode *inode = mapping->host; |
c63c7b05 | 345 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
346 | int err; |
347 | ||
91d5b470 CL |
348 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
349 | ||
c63c7b05 | 350 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 351 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 352 | nfs_pageio_complete(&pgio); |
f758c885 | 353 | if (err < 0) |
1da177e4 | 354 | return err; |
f758c885 | 355 | if (pgio.pg_error < 0) |
c63c7b05 TM |
356 | return pgio.pg_error; |
357 | return 0; | |
1da177e4 LT |
358 | } |
359 | ||
360 | /* | |
361 | * Insert a write request into an inode | |
362 | */ | |
363 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
364 | { | |
365 | struct nfs_inode *nfsi = NFS_I(inode); | |
366 | int error; | |
367 | ||
368 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
369 | BUG_ON(error == -EEXIST); | |
370 | if (error) | |
371 | return error; | |
372 | if (!nfsi->npages) { | |
373 | igrab(inode); | |
374 | nfs_begin_data_update(inode); | |
375 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
376 | nfsi->change_attr++; | |
377 | } | |
deb7d638 | 378 | SetPagePrivate(req->wb_page); |
277459d2 | 379 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 380 | nfsi->npages++; |
c03b4024 | 381 | kref_get(&req->wb_kref); |
1da177e4 LT |
382 | return 0; |
383 | } | |
384 | ||
385 | /* | |
89a09141 | 386 | * Remove a write request from an inode |
1da177e4 LT |
387 | */ |
388 | static void nfs_inode_remove_request(struct nfs_page *req) | |
389 | { | |
88be9f99 | 390 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
391 | struct nfs_inode *nfsi = NFS_I(inode); |
392 | ||
393 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
394 | ||
587142f8 | 395 | spin_lock(&inode->i_lock); |
277459d2 | 396 | set_page_private(req->wb_page, 0); |
deb7d638 | 397 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
398 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
399 | nfsi->npages--; | |
400 | if (!nfsi->npages) { | |
587142f8 | 401 | spin_unlock(&inode->i_lock); |
951a143b | 402 | nfs_end_data_update(inode); |
1da177e4 LT |
403 | iput(inode); |
404 | } else | |
587142f8 | 405 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
406 | nfs_clear_request(req); |
407 | nfs_release_request(req); | |
408 | } | |
409 | ||
61822ab5 TM |
410 | static void |
411 | nfs_redirty_request(struct nfs_page *req) | |
412 | { | |
61822ab5 TM |
413 | __set_page_dirty_nobuffers(req->wb_page); |
414 | } | |
415 | ||
1da177e4 LT |
416 | /* |
417 | * Check if a request is dirty | |
418 | */ | |
419 | static inline int | |
420 | nfs_dirty_request(struct nfs_page *req) | |
421 | { | |
5a6d41b3 TM |
422 | struct page *page = req->wb_page; |
423 | ||
612c9384 | 424 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
425 | return 0; |
426 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
427 | } |
428 | ||
429 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
430 | /* | |
431 | * Add a request to the inode's commit list. | |
432 | */ | |
433 | static void | |
434 | nfs_mark_request_commit(struct nfs_page *req) | |
435 | { | |
88be9f99 | 436 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
437 | struct nfs_inode *nfsi = NFS_I(inode); |
438 | ||
587142f8 | 439 | spin_lock(&inode->i_lock); |
1da177e4 | 440 | nfsi->ncommit++; |
612c9384 | 441 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
5c369683 TM |
442 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
443 | req->wb_index, | |
444 | NFS_PAGE_TAG_COMMIT); | |
587142f8 | 445 | spin_unlock(&inode->i_lock); |
fd39fc85 | 446 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
a1803044 | 447 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 448 | } |
8e821cad TM |
449 | |
450 | static inline | |
451 | int nfs_write_need_commit(struct nfs_write_data *data) | |
452 | { | |
453 | return data->verf.committed != NFS_FILE_SYNC; | |
454 | } | |
455 | ||
456 | static inline | |
457 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
458 | { | |
612c9384 | 459 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
460 | nfs_mark_request_commit(req); |
461 | return 1; | |
462 | } | |
463 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
464 | nfs_redirty_request(req); | |
465 | return 1; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | #else | |
470 | static inline void | |
471 | nfs_mark_request_commit(struct nfs_page *req) | |
472 | { | |
473 | } | |
474 | ||
475 | static inline | |
476 | int nfs_write_need_commit(struct nfs_write_data *data) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static inline | |
482 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
483 | { | |
484 | return 0; | |
485 | } | |
1da177e4 LT |
486 | #endif |
487 | ||
488 | /* | |
489 | * Wait for a request to complete. | |
490 | * | |
491 | * Interruptible by signals only if mounted with intr flag. | |
492 | */ | |
ca52fec1 | 493 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
494 | { |
495 | struct nfs_inode *nfsi = NFS_I(inode); | |
496 | struct nfs_page *req; | |
ca52fec1 | 497 | pgoff_t idx_end, next; |
1da177e4 LT |
498 | unsigned int res = 0; |
499 | int error; | |
500 | ||
501 | if (npages == 0) | |
502 | idx_end = ~0; | |
503 | else | |
504 | idx_end = idx_start + npages - 1; | |
505 | ||
1da177e4 | 506 | next = idx_start; |
9fd367f0 | 507 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
508 | if (req->wb_index > idx_end) |
509 | break; | |
510 | ||
511 | next = req->wb_index + 1; | |
c6a556b8 | 512 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 513 | |
c03b4024 | 514 | kref_get(&req->wb_kref); |
587142f8 | 515 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
516 | error = nfs_wait_on_request(req); |
517 | nfs_release_request(req); | |
587142f8 | 518 | spin_lock(&inode->i_lock); |
1da177e4 LT |
519 | if (error < 0) |
520 | return error; | |
1da177e4 LT |
521 | res++; |
522 | } | |
1da177e4 LT |
523 | return res; |
524 | } | |
525 | ||
83715ad5 TM |
526 | static void nfs_cancel_commit_list(struct list_head *head) |
527 | { | |
528 | struct nfs_page *req; | |
529 | ||
530 | while(!list_empty(head)) { | |
531 | req = nfs_list_entry(head->next); | |
b6dff26a | 532 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 | 533 | nfs_list_remove_request(req); |
612c9384 | 534 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 535 | nfs_inode_remove_request(req); |
b6dff26a | 536 | nfs_unlock_request(req); |
83715ad5 TM |
537 | } |
538 | } | |
539 | ||
1da177e4 LT |
540 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
541 | /* | |
542 | * nfs_scan_commit - Scan an inode for commit requests | |
543 | * @inode: NFS inode to scan | |
544 | * @dst: destination list | |
545 | * @idx_start: lower bound of page->index to scan. | |
546 | * @npages: idx_start + npages sets the upper bound to scan. | |
547 | * | |
548 | * Moves requests from the inode's 'commit' request list. | |
549 | * The requests are *not* checked to ensure that they form a contiguous set. | |
550 | */ | |
551 | static int | |
ca52fec1 | 552 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
553 | { |
554 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
555 | int res = 0; |
556 | ||
557 | if (nfsi->ncommit != 0) { | |
5c369683 TM |
558 | res = nfs_scan_list(nfsi, dst, idx_start, npages, |
559 | NFS_PAGE_TAG_COMMIT); | |
3da28eb1 | 560 | nfsi->ncommit -= res; |
3da28eb1 | 561 | } |
1da177e4 LT |
562 | return res; |
563 | } | |
c42de9dd | 564 | #else |
ca52fec1 | 565 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
566 | { |
567 | return 0; | |
568 | } | |
1da177e4 LT |
569 | #endif |
570 | ||
1da177e4 LT |
571 | /* |
572 | * Try to update any existing write request, or create one if there is none. | |
573 | * In order to match, the request's credentials must match those of | |
574 | * the calling process. | |
575 | * | |
576 | * Note: Should always be called with the Page Lock held! | |
577 | */ | |
578 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 579 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 580 | { |
89a09141 PZ |
581 | struct address_space *mapping = page->mapping; |
582 | struct inode *inode = mapping->host; | |
1da177e4 | 583 | struct nfs_page *req, *new = NULL; |
ca52fec1 | 584 | pgoff_t rqend, end; |
1da177e4 LT |
585 | |
586 | end = offset + bytes; | |
587 | ||
1da177e4 LT |
588 | for (;;) { |
589 | /* Loop over all inode entries and see if we find | |
590 | * A request for the page we wish to update | |
591 | */ | |
587142f8 | 592 | spin_lock(&inode->i_lock); |
277459d2 | 593 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
594 | if (req) { |
595 | if (!nfs_lock_request_dontget(req)) { | |
596 | int error; | |
277459d2 | 597 | |
587142f8 | 598 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
599 | error = nfs_wait_on_request(req); |
600 | nfs_release_request(req); | |
1dd594b2 NB |
601 | if (error < 0) { |
602 | if (new) | |
603 | nfs_release_request(new); | |
1da177e4 | 604 | return ERR_PTR(error); |
1dd594b2 | 605 | } |
1da177e4 LT |
606 | continue; |
607 | } | |
587142f8 | 608 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
609 | if (new) |
610 | nfs_release_request(new); | |
611 | break; | |
612 | } | |
613 | ||
614 | if (new) { | |
615 | int error; | |
616 | nfs_lock_request_dontget(new); | |
617 | error = nfs_inode_add_request(inode, new); | |
618 | if (error) { | |
587142f8 | 619 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
620 | nfs_unlock_request(new); |
621 | return ERR_PTR(error); | |
622 | } | |
587142f8 | 623 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
624 | return new; |
625 | } | |
587142f8 | 626 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
627 | |
628 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
629 | if (IS_ERR(new)) | |
630 | return new; | |
631 | } | |
632 | ||
633 | /* We have a request for our page. | |
634 | * If the creds don't match, or the | |
635 | * page addresses don't match, | |
636 | * tell the caller to wait on the conflicting | |
637 | * request. | |
638 | */ | |
639 | rqend = req->wb_offset + req->wb_bytes; | |
640 | if (req->wb_context != ctx | |
641 | || req->wb_page != page | |
642 | || !nfs_dirty_request(req) | |
643 | || offset > rqend || end < req->wb_offset) { | |
644 | nfs_unlock_request(req); | |
645 | return ERR_PTR(-EBUSY); | |
646 | } | |
647 | ||
648 | /* Okay, the request matches. Update the region */ | |
649 | if (offset < req->wb_offset) { | |
650 | req->wb_offset = offset; | |
651 | req->wb_pgbase = offset; | |
652 | req->wb_bytes = rqend - req->wb_offset; | |
653 | } | |
654 | ||
655 | if (end > rqend) | |
656 | req->wb_bytes = end - req->wb_offset; | |
657 | ||
658 | return req; | |
659 | } | |
660 | ||
661 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
662 | { | |
663 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 664 | struct nfs_page *req; |
1a54533e | 665 | int do_flush, status; |
1da177e4 LT |
666 | /* |
667 | * Look for a request corresponding to this page. If there | |
668 | * is one, and it belongs to another file, we flush it out | |
669 | * before we try to copy anything into the page. Do this | |
670 | * due to the lack of an ACCESS-type call in NFSv2. | |
671 | * Also do the same if we find a request from an existing | |
672 | * dropped page. | |
673 | */ | |
1a54533e TM |
674 | do { |
675 | req = nfs_page_find_request(page); | |
676 | if (req == NULL) | |
677 | return 0; | |
678 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 679 | || !nfs_dirty_request(req); |
1da177e4 | 680 | nfs_release_request(req); |
1a54533e TM |
681 | if (!do_flush) |
682 | return 0; | |
683 | status = nfs_wb_page(page->mapping->host, page); | |
684 | } while (status == 0); | |
685 | return status; | |
1da177e4 LT |
686 | } |
687 | ||
688 | /* | |
689 | * Update and possibly write a cached page of an NFS file. | |
690 | * | |
691 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
692 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
693 | */ | |
694 | int nfs_updatepage(struct file *file, struct page *page, | |
695 | unsigned int offset, unsigned int count) | |
696 | { | |
697 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 698 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
699 | int status = 0; |
700 | ||
91d5b470 CL |
701 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
702 | ||
1da177e4 | 703 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
704 | file->f_path.dentry->d_parent->d_name.name, |
705 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 706 | (long long)(page_offset(page) +offset)); |
1da177e4 | 707 | |
1da177e4 LT |
708 | /* If we're not using byte range locks, and we know the page |
709 | * is entirely in cache, it may be more efficient to avoid | |
710 | * fragmenting write requests. | |
711 | */ | |
ab0a3dbe | 712 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 713 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 714 | offset = 0; |
1da177e4 LT |
715 | } |
716 | ||
e21195a7 | 717 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 718 | __set_page_dirty_nobuffers(page); |
1da177e4 | 719 | |
1da177e4 LT |
720 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
721 | status, (long long)i_size_read(inode)); | |
722 | if (status < 0) | |
a301b777 | 723 | nfs_set_pageerror(page); |
1da177e4 LT |
724 | return status; |
725 | } | |
726 | ||
727 | static void nfs_writepage_release(struct nfs_page *req) | |
728 | { | |
1da177e4 | 729 | |
44dd151d TM |
730 | if (PageError(req->wb_page)) { |
731 | nfs_end_page_writeback(req->wb_page); | |
732 | nfs_inode_remove_request(req); | |
733 | } else if (!nfs_reschedule_unstable_write(req)) { | |
734 | /* Set the PG_uptodate flag */ | |
735 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
736 | nfs_end_page_writeback(req->wb_page); |
737 | nfs_inode_remove_request(req); | |
738 | } else | |
739 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 740 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
741 | } |
742 | ||
743 | static inline int flush_task_priority(int how) | |
744 | { | |
745 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
746 | case FLUSH_HIGHPRI: | |
747 | return RPC_PRIORITY_HIGH; | |
748 | case FLUSH_LOWPRI: | |
749 | return RPC_PRIORITY_LOW; | |
750 | } | |
751 | return RPC_PRIORITY_NORMAL; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Set up the argument/result storage required for the RPC call. | |
756 | */ | |
757 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
758 | struct nfs_write_data *data, | |
788e7a89 | 759 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
760 | unsigned int count, unsigned int offset, |
761 | int how) | |
762 | { | |
1da177e4 | 763 | struct inode *inode; |
788e7a89 | 764 | int flags; |
1da177e4 LT |
765 | |
766 | /* Set up the RPC argument and reply structs | |
767 | * NB: take care not to mess about with data->commit et al. */ | |
768 | ||
769 | data->req = req; | |
88be9f99 | 770 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
771 | data->cred = req->wb_context->cred; |
772 | ||
773 | data->args.fh = NFS_FH(inode); | |
774 | data->args.offset = req_offset(req) + offset; | |
775 | data->args.pgbase = req->wb_pgbase + offset; | |
776 | data->args.pages = data->pagevec; | |
777 | data->args.count = count; | |
778 | data->args.context = req->wb_context; | |
779 | ||
780 | data->res.fattr = &data->fattr; | |
781 | data->res.count = count; | |
782 | data->res.verf = &data->verf; | |
0e574af1 | 783 | nfs_fattr_init(&data->fattr); |
1da177e4 | 784 | |
788e7a89 TM |
785 | /* Set up the initial task struct. */ |
786 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
787 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
788 | NFS_PROTO(inode)->write_setup(data, how); |
789 | ||
790 | data->task.tk_priority = flush_task_priority(how); | |
791 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 792 | |
a3f565b1 CL |
793 | dprintk("NFS: %5u initiated write call " |
794 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 795 | data->task.tk_pid, |
1da177e4 LT |
796 | inode->i_sb->s_id, |
797 | (long long)NFS_FILEID(inode), | |
798 | count, | |
799 | (unsigned long long)data->args.offset); | |
800 | } | |
801 | ||
802 | static void nfs_execute_write(struct nfs_write_data *data) | |
803 | { | |
804 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
805 | sigset_t oldset; | |
806 | ||
807 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 808 | rpc_execute(&data->task); |
1da177e4 LT |
809 | rpc_clnt_sigunmask(clnt, &oldset); |
810 | } | |
811 | ||
812 | /* | |
813 | * Generate multiple small requests to write out a single | |
814 | * contiguous dirty area on one page. | |
815 | */ | |
8d5658c9 | 816 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
817 | { |
818 | struct nfs_page *req = nfs_list_entry(head->next); | |
819 | struct page *page = req->wb_page; | |
820 | struct nfs_write_data *data; | |
e9f7bee1 TM |
821 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
822 | unsigned int offset; | |
1da177e4 LT |
823 | int requests = 0; |
824 | LIST_HEAD(list); | |
825 | ||
826 | nfs_list_remove_request(req); | |
827 | ||
bcb71bba | 828 | nbytes = count; |
e9f7bee1 TM |
829 | do { |
830 | size_t len = min(nbytes, wsize); | |
831 | ||
8d5658c9 | 832 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
833 | if (!data) |
834 | goto out_bad; | |
835 | list_add(&data->pages, &list); | |
836 | requests++; | |
e9f7bee1 TM |
837 | nbytes -= len; |
838 | } while (nbytes != 0); | |
1da177e4 LT |
839 | atomic_set(&req->wb_complete, requests); |
840 | ||
841 | ClearPageError(page); | |
1da177e4 | 842 | offset = 0; |
bcb71bba | 843 | nbytes = count; |
1da177e4 LT |
844 | do { |
845 | data = list_entry(list.next, struct nfs_write_data, pages); | |
846 | list_del_init(&data->pages); | |
847 | ||
848 | data->pagevec[0] = page; | |
1da177e4 | 849 | |
bcb71bba TM |
850 | if (nbytes < wsize) |
851 | wsize = nbytes; | |
852 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, | |
853 | wsize, offset, how); | |
854 | offset += wsize; | |
855 | nbytes -= wsize; | |
1da177e4 LT |
856 | nfs_execute_write(data); |
857 | } while (nbytes != 0); | |
858 | ||
859 | return 0; | |
860 | ||
861 | out_bad: | |
862 | while (!list_empty(&list)) { | |
863 | data = list_entry(list.next, struct nfs_write_data, pages); | |
864 | list_del(&data->pages); | |
8aca67f0 | 865 | nfs_writedata_release(data); |
1da177e4 | 866 | } |
61822ab5 | 867 | nfs_redirty_request(req); |
6d677e35 | 868 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 869 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
870 | return -ENOMEM; |
871 | } | |
872 | ||
873 | /* | |
874 | * Create an RPC task for the given write request and kick it. | |
875 | * The page must have been locked by the caller. | |
876 | * | |
877 | * It may happen that the page we're passed is not marked dirty. | |
878 | * This is the case if nfs_updatepage detects a conflicting request | |
879 | * that has been written but not committed. | |
880 | */ | |
8d5658c9 | 881 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
882 | { |
883 | struct nfs_page *req; | |
884 | struct page **pages; | |
885 | struct nfs_write_data *data; | |
1da177e4 | 886 | |
8d5658c9 | 887 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
888 | if (!data) |
889 | goto out_bad; | |
890 | ||
891 | pages = data->pagevec; | |
1da177e4 LT |
892 | while (!list_empty(head)) { |
893 | req = nfs_list_entry(head->next); | |
894 | nfs_list_remove_request(req); | |
895 | nfs_list_add_request(req, &data->pages); | |
896 | ClearPageError(req->wb_page); | |
1da177e4 | 897 | *pages++ = req->wb_page; |
1da177e4 LT |
898 | } |
899 | req = nfs_list_entry(data->pages.next); | |
900 | ||
1da177e4 | 901 | /* Set up the argument struct */ |
788e7a89 | 902 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
903 | |
904 | nfs_execute_write(data); | |
905 | return 0; | |
906 | out_bad: | |
907 | while (!list_empty(head)) { | |
10afec90 | 908 | req = nfs_list_entry(head->next); |
1da177e4 | 909 | nfs_list_remove_request(req); |
61822ab5 | 910 | nfs_redirty_request(req); |
6d677e35 | 911 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 912 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
913 | } |
914 | return -ENOMEM; | |
915 | } | |
916 | ||
c63c7b05 TM |
917 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
918 | struct inode *inode, int ioflags) | |
1da177e4 | 919 | { |
7d46a49f | 920 | int wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 921 | |
bcb71bba | 922 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 923 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 924 | else |
c63c7b05 | 925 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
926 | } |
927 | ||
928 | /* | |
929 | * Handle a write reply that flushed part of a page. | |
930 | */ | |
788e7a89 | 931 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 932 | { |
788e7a89 | 933 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
934 | struct nfs_page *req = data->req; |
935 | struct page *page = req->wb_page; | |
936 | ||
937 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
938 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
939 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
940 | req->wb_bytes, |
941 | (long long)req_offset(req)); | |
942 | ||
788e7a89 TM |
943 | if (nfs_writeback_done(task, data) != 0) |
944 | return; | |
945 | ||
946 | if (task->tk_status < 0) { | |
a301b777 | 947 | nfs_set_pageerror(page); |
788e7a89 TM |
948 | req->wb_context->error = task->tk_status; |
949 | dprintk(", error = %d\n", task->tk_status); | |
8e821cad | 950 | goto out; |
1da177e4 LT |
951 | } |
952 | ||
8e821cad | 953 | if (nfs_write_need_commit(data)) { |
587142f8 | 954 | struct inode *inode = page->mapping->host; |
8e821cad | 955 | |
587142f8 | 956 | spin_lock(&inode->i_lock); |
8e821cad TM |
957 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
958 | /* Do nothing we need to resend the writes */ | |
959 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
960 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
961 | dprintk(" defer commit\n"); | |
962 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
963 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
964 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
965 | dprintk(" server reboot detected\n"); | |
966 | } | |
587142f8 | 967 | spin_unlock(&inode->i_lock); |
8e821cad TM |
968 | } else |
969 | dprintk(" OK\n"); | |
970 | ||
971 | out: | |
1da177e4 LT |
972 | if (atomic_dec_and_test(&req->wb_complete)) |
973 | nfs_writepage_release(req); | |
974 | } | |
975 | ||
788e7a89 TM |
976 | static const struct rpc_call_ops nfs_write_partial_ops = { |
977 | .rpc_call_done = nfs_writeback_done_partial, | |
978 | .rpc_release = nfs_writedata_release, | |
979 | }; | |
980 | ||
1da177e4 LT |
981 | /* |
982 | * Handle a write reply that flushes a whole page. | |
983 | * | |
984 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
985 | * writebacks since the page->count is kept > 1 for as long | |
986 | * as the page has a write request pending. | |
987 | */ | |
788e7a89 | 988 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 989 | { |
788e7a89 | 990 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
991 | struct nfs_page *req; |
992 | struct page *page; | |
993 | ||
788e7a89 TM |
994 | if (nfs_writeback_done(task, data) != 0) |
995 | return; | |
996 | ||
1da177e4 LT |
997 | /* Update attributes as result of writeback. */ |
998 | while (!list_empty(&data->pages)) { | |
999 | req = nfs_list_entry(data->pages.next); | |
1000 | nfs_list_remove_request(req); | |
1001 | page = req->wb_page; | |
1002 | ||
1003 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1004 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1005 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1006 | req->wb_bytes, |
1007 | (long long)req_offset(req)); | |
1008 | ||
788e7a89 | 1009 | if (task->tk_status < 0) { |
a301b777 | 1010 | nfs_set_pageerror(page); |
788e7a89 | 1011 | req->wb_context->error = task->tk_status; |
788e7a89 | 1012 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1013 | goto remove_request; |
1da177e4 | 1014 | } |
1da177e4 | 1015 | |
8e821cad TM |
1016 | if (nfs_write_need_commit(data)) { |
1017 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1018 | nfs_mark_request_commit(req); | |
1019 | nfs_end_page_writeback(page); | |
1020 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1021 | goto next; |
1022 | } | |
44dd151d TM |
1023 | /* Set the PG_uptodate flag? */ |
1024 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
1025 | dprintk(" OK\n"); |
1026 | remove_request: | |
1027 | nfs_end_page_writeback(page); | |
1da177e4 | 1028 | nfs_inode_remove_request(req); |
1da177e4 | 1029 | next: |
9fd367f0 | 1030 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1031 | } |
1032 | } | |
1033 | ||
788e7a89 TM |
1034 | static const struct rpc_call_ops nfs_write_full_ops = { |
1035 | .rpc_call_done = nfs_writeback_done_full, | |
1036 | .rpc_release = nfs_writedata_release, | |
1037 | }; | |
1038 | ||
1039 | ||
1da177e4 LT |
1040 | /* |
1041 | * This function is called when the WRITE call is complete. | |
1042 | */ | |
462d5b32 | 1043 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1044 | { |
1da177e4 LT |
1045 | struct nfs_writeargs *argp = &data->args; |
1046 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1047 | int status; |
1da177e4 | 1048 | |
a3f565b1 | 1049 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1050 | task->tk_pid, task->tk_status); |
1051 | ||
f551e44f CL |
1052 | /* |
1053 | * ->write_done will attempt to use post-op attributes to detect | |
1054 | * conflicting writes by other clients. A strict interpretation | |
1055 | * of close-to-open would allow us to continue caching even if | |
1056 | * another writer had changed the file, but some applications | |
1057 | * depend on tighter cache coherency when writing. | |
1058 | */ | |
788e7a89 TM |
1059 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1060 | if (status != 0) | |
1061 | return status; | |
91d5b470 CL |
1062 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1063 | ||
1da177e4 LT |
1064 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1065 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1066 | /* We tried a write call, but the server did not | |
1067 | * commit data to stable storage even though we | |
1068 | * requested it. | |
1069 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1070 | * the server reports NFS_DATA_SYNC, but performs | |
1071 | * NFS_FILE_SYNC. We therefore implement this checking | |
1072 | * as a dprintk() in order to avoid filling syslog. | |
1073 | */ | |
1074 | static unsigned long complain; | |
1075 | ||
1076 | if (time_before(complain, jiffies)) { | |
1077 | dprintk("NFS: faulty NFS server %s:" | |
1078 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1079 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1080 | resp->verf->committed, argp->stable); |
1081 | complain = jiffies + 300 * HZ; | |
1082 | } | |
1083 | } | |
1084 | #endif | |
1085 | /* Is this a short write? */ | |
1086 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1087 | static unsigned long complain; | |
1088 | ||
91d5b470 CL |
1089 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1090 | ||
1da177e4 LT |
1091 | /* Has the server at least made some progress? */ |
1092 | if (resp->count != 0) { | |
1093 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1094 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1095 | /* Resend from where the server left off */ | |
1096 | argp->offset += resp->count; | |
1097 | argp->pgbase += resp->count; | |
1098 | argp->count -= resp->count; | |
1099 | } else { | |
1100 | /* Resend as a stable write in order to avoid | |
1101 | * headaches in the case of a server crash. | |
1102 | */ | |
1103 | argp->stable = NFS_FILE_SYNC; | |
1104 | } | |
1105 | rpc_restart_call(task); | |
788e7a89 | 1106 | return -EAGAIN; |
1da177e4 LT |
1107 | } |
1108 | if (time_before(complain, jiffies)) { | |
1109 | printk(KERN_WARNING | |
1110 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1111 | argp->count); | |
1112 | complain = jiffies + 300 * HZ; | |
1113 | } | |
1114 | /* Can't do anything about it except throw an error. */ | |
1115 | task->tk_status = -EIO; | |
1116 | } | |
788e7a89 | 1117 | return 0; |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | ||
1121 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1122 | void nfs_commit_release(void *wdata) |
1da177e4 | 1123 | { |
1da177e4 LT |
1124 | nfs_commit_free(wdata); |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Set up the argument/result storage required for the RPC call. | |
1129 | */ | |
1130 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1131 | struct nfs_write_data *data, |
1132 | int how) | |
1da177e4 | 1133 | { |
3da28eb1 | 1134 | struct nfs_page *first; |
1da177e4 | 1135 | struct inode *inode; |
788e7a89 | 1136 | int flags; |
1da177e4 LT |
1137 | |
1138 | /* Set up the RPC argument and reply structs | |
1139 | * NB: take care not to mess about with data->commit et al. */ | |
1140 | ||
1141 | list_splice_init(head, &data->pages); | |
1142 | first = nfs_list_entry(data->pages.next); | |
88be9f99 | 1143 | inode = first->wb_context->path.dentry->d_inode; |
1da177e4 | 1144 | |
1da177e4 LT |
1145 | data->inode = inode; |
1146 | data->cred = first->wb_context->cred; | |
1147 | ||
1148 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1149 | /* Note: we always request a commit of the entire inode */ |
1150 | data->args.offset = 0; | |
1151 | data->args.count = 0; | |
1152 | data->res.count = 0; | |
1da177e4 LT |
1153 | data->res.fattr = &data->fattr; |
1154 | data->res.verf = &data->verf; | |
0e574af1 | 1155 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1156 | |
1157 | /* Set up the initial task struct. */ | |
1158 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1159 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1160 | NFS_PROTO(inode)->commit_setup(data, how); |
1161 | ||
1162 | data->task.tk_priority = flush_task_priority(how); | |
1163 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1164 | |
a3f565b1 | 1165 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | /* | |
1169 | * Commit dirty pages | |
1170 | */ | |
1171 | static int | |
40859d7e | 1172 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1173 | { |
1174 | struct nfs_write_data *data; | |
1175 | struct nfs_page *req; | |
1176 | ||
e9f7bee1 | 1177 | data = nfs_commit_alloc(); |
1da177e4 LT |
1178 | |
1179 | if (!data) | |
1180 | goto out_bad; | |
1181 | ||
1182 | /* Set up the argument struct */ | |
1183 | nfs_commit_rpcsetup(head, data, how); | |
1184 | ||
1185 | nfs_execute_write(data); | |
1186 | return 0; | |
1187 | out_bad: | |
1188 | while (!list_empty(head)) { | |
1189 | req = nfs_list_entry(head->next); | |
1190 | nfs_list_remove_request(req); | |
1191 | nfs_mark_request_commit(req); | |
83715ad5 | 1192 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
9fd367f0 | 1193 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1194 | } |
1195 | return -ENOMEM; | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * COMMIT call returned | |
1200 | */ | |
788e7a89 | 1201 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1202 | { |
963d8fe5 | 1203 | struct nfs_write_data *data = calldata; |
1da177e4 | 1204 | struct nfs_page *req; |
1da177e4 | 1205 | |
a3f565b1 | 1206 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1207 | task->tk_pid, task->tk_status); |
1208 | ||
788e7a89 TM |
1209 | /* Call the NFS version-specific code */ |
1210 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1211 | return; | |
1212 | ||
1da177e4 LT |
1213 | while (!list_empty(&data->pages)) { |
1214 | req = nfs_list_entry(data->pages.next); | |
1215 | nfs_list_remove_request(req); | |
612c9384 | 1216 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1217 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1218 | |
1219 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1220 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1221 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1222 | req->wb_bytes, |
1223 | (long long)req_offset(req)); | |
1224 | if (task->tk_status < 0) { | |
1225 | req->wb_context->error = task->tk_status; | |
1226 | nfs_inode_remove_request(req); | |
1227 | dprintk(", error = %d\n", task->tk_status); | |
1228 | goto next; | |
1229 | } | |
1230 | ||
1231 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1232 | * returned by the server against all stored verfs. */ | |
1233 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1234 | /* We have a match */ | |
44dd151d TM |
1235 | /* Set the PG_uptodate flag */ |
1236 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, | |
1237 | req->wb_bytes); | |
1da177e4 LT |
1238 | nfs_inode_remove_request(req); |
1239 | dprintk(" OK\n"); | |
1240 | goto next; | |
1241 | } | |
1242 | /* We have a mismatch. Write the page again */ | |
1243 | dprintk(" mismatch\n"); | |
61822ab5 | 1244 | nfs_redirty_request(req); |
1da177e4 | 1245 | next: |
9fd367f0 | 1246 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1247 | } |
1da177e4 | 1248 | } |
788e7a89 TM |
1249 | |
1250 | static const struct rpc_call_ops nfs_commit_ops = { | |
1251 | .rpc_call_done = nfs_commit_done, | |
1252 | .rpc_release = nfs_commit_release, | |
1253 | }; | |
1da177e4 | 1254 | |
3da28eb1 | 1255 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1256 | { |
1da177e4 | 1257 | LIST_HEAD(head); |
7d46a49f | 1258 | int res; |
1da177e4 | 1259 | |
587142f8 | 1260 | spin_lock(&inode->i_lock); |
3da28eb1 | 1261 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1262 | spin_unlock(&inode->i_lock); |
1da177e4 | 1263 | if (res) { |
7d46a49f | 1264 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1265 | if (error < 0) |
1266 | return error; | |
1267 | } | |
1da177e4 LT |
1268 | return res; |
1269 | } | |
c63c7b05 TM |
1270 | #else |
1271 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1272 | { | |
1273 | return 0; | |
1274 | } | |
1da177e4 LT |
1275 | #endif |
1276 | ||
1c75950b | 1277 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1278 | { |
1c75950b | 1279 | struct inode *inode = mapping->host; |
ca52fec1 | 1280 | pgoff_t idx_start, idx_end; |
1c75950b | 1281 | unsigned int npages = 0; |
c42de9dd | 1282 | LIST_HEAD(head); |
70b9ecbd | 1283 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1284 | long pages, ret; |
1da177e4 | 1285 | |
1c75950b TM |
1286 | /* FIXME */ |
1287 | if (wbc->range_cyclic) | |
1288 | idx_start = 0; | |
1289 | else { | |
1290 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1291 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1292 | if (idx_end > idx_start) { | |
ca52fec1 | 1293 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1294 | npages = l_npages; |
1295 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1296 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1297 | npages = 0; |
1298 | } | |
1299 | } | |
c42de9dd | 1300 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1301 | spin_lock(&inode->i_lock); |
1da177e4 | 1302 | do { |
c42de9dd TM |
1303 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1304 | if (ret != 0) | |
70b9ecbd | 1305 | continue; |
c42de9dd TM |
1306 | if (nocommit) |
1307 | break; | |
d2ccddf0 | 1308 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1309 | if (pages == 0) |
c42de9dd | 1310 | break; |
d2ccddf0 | 1311 | if (how & FLUSH_INVALIDATE) { |
587142f8 | 1312 | spin_unlock(&inode->i_lock); |
83715ad5 | 1313 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1314 | ret = pages; |
587142f8 | 1315 | spin_lock(&inode->i_lock); |
d2ccddf0 TM |
1316 | continue; |
1317 | } | |
1318 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
587142f8 | 1319 | spin_unlock(&inode->i_lock); |
c42de9dd | 1320 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1321 | spin_lock(&inode->i_lock); |
1322 | ||
c42de9dd | 1323 | } while (ret >= 0); |
587142f8 | 1324 | spin_unlock(&inode->i_lock); |
c42de9dd | 1325 | return ret; |
1da177e4 LT |
1326 | } |
1327 | ||
ed90ef51 | 1328 | static int nfs_write_mapping(struct address_space *mapping, int how) |
1c75950b | 1329 | { |
1c75950b TM |
1330 | struct writeback_control wbc = { |
1331 | .bdi = mapping->backing_dev_info, | |
1332 | .sync_mode = WB_SYNC_ALL, | |
1333 | .nr_to_write = LONG_MAX, | |
61822ab5 | 1334 | .for_writepages = 1, |
1c75950b TM |
1335 | .range_cyclic = 1, |
1336 | }; | |
1337 | int ret; | |
1338 | ||
c63c7b05 | 1339 | ret = nfs_writepages(mapping, &wbc); |
61822ab5 TM |
1340 | if (ret < 0) |
1341 | goto out; | |
ed90ef51 TM |
1342 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); |
1343 | if (ret < 0) | |
1344 | goto out; | |
1345 | return 0; | |
61822ab5 | 1346 | out: |
e507d9eb | 1347 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1348 | return ret; |
1349 | } | |
1350 | ||
ed90ef51 TM |
1351 | /* |
1352 | * flush the inode to disk. | |
1353 | */ | |
1354 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1355 | { |
ed90ef51 TM |
1356 | return nfs_write_mapping(inode->i_mapping, 0); |
1357 | } | |
1c75950b | 1358 | |
ed90ef51 TM |
1359 | int nfs_wb_nocommit(struct inode *inode) |
1360 | { | |
1361 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1362 | } |
1363 | ||
1b3b4a1a TM |
1364 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1365 | { | |
1366 | struct nfs_page *req; | |
1367 | loff_t range_start = page_offset(page); | |
1368 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1369 | struct writeback_control wbc = { | |
1370 | .bdi = page->mapping->backing_dev_info, | |
1371 | .sync_mode = WB_SYNC_ALL, | |
1372 | .nr_to_write = LONG_MAX, | |
1373 | .range_start = range_start, | |
1374 | .range_end = range_end, | |
1375 | }; | |
1376 | int ret = 0; | |
1377 | ||
1378 | BUG_ON(!PageLocked(page)); | |
1379 | for (;;) { | |
1380 | req = nfs_page_find_request(page); | |
1381 | if (req == NULL) | |
1382 | goto out; | |
1383 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1384 | nfs_release_request(req); | |
1385 | break; | |
1386 | } | |
1387 | if (nfs_lock_request_dontget(req)) { | |
1388 | nfs_inode_remove_request(req); | |
1389 | /* | |
1390 | * In case nfs_inode_remove_request has marked the | |
1391 | * page as being dirty | |
1392 | */ | |
1393 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1394 | nfs_unlock_request(req); | |
1395 | break; | |
1396 | } | |
1397 | ret = nfs_wait_on_request(req); | |
1398 | if (ret < 0) | |
1399 | goto out; | |
1400 | } | |
1401 | if (!PagePrivate(page)) | |
1402 | return 0; | |
1403 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); | |
1404 | out: | |
1405 | return ret; | |
1406 | } | |
1407 | ||
61822ab5 | 1408 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1409 | { |
1410 | loff_t range_start = page_offset(page); | |
1411 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1412 | struct writeback_control wbc = { |
1413 | .bdi = page->mapping->backing_dev_info, | |
1414 | .sync_mode = WB_SYNC_ALL, | |
1415 | .nr_to_write = LONG_MAX, | |
1416 | .range_start = range_start, | |
1417 | .range_end = range_end, | |
1418 | }; | |
1419 | int ret; | |
1c75950b | 1420 | |
4d770ccf | 1421 | BUG_ON(!PageLocked(page)); |
c63c7b05 | 1422 | if (clear_page_dirty_for_io(page)) { |
4d770ccf TM |
1423 | ret = nfs_writepage_locked(page, &wbc); |
1424 | if (ret < 0) | |
1425 | goto out; | |
1426 | } | |
f40313ac TM |
1427 | if (!PagePrivate(page)) |
1428 | return 0; | |
4d770ccf TM |
1429 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1430 | if (ret >= 0) | |
1431 | return 0; | |
1432 | out: | |
e507d9eb | 1433 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1434 | return ret; |
1c75950b TM |
1435 | } |
1436 | ||
1437 | /* | |
1438 | * Write back all requests on one page - we do this before reading it. | |
1439 | */ | |
1440 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1441 | { | |
4d770ccf | 1442 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1443 | } |
1444 | ||
f7b422b1 | 1445 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1446 | { |
1447 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1448 | sizeof(struct nfs_write_data), | |
1449 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1450 | NULL); |
1da177e4 LT |
1451 | if (nfs_wdata_cachep == NULL) |
1452 | return -ENOMEM; | |
1453 | ||
93d2341c MD |
1454 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1455 | nfs_wdata_cachep); | |
1da177e4 LT |
1456 | if (nfs_wdata_mempool == NULL) |
1457 | return -ENOMEM; | |
1458 | ||
93d2341c MD |
1459 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1460 | nfs_wdata_cachep); | |
1da177e4 LT |
1461 | if (nfs_commit_mempool == NULL) |
1462 | return -ENOMEM; | |
1463 | ||
89a09141 PZ |
1464 | /* |
1465 | * NFS congestion size, scale with available memory. | |
1466 | * | |
1467 | * 64MB: 8192k | |
1468 | * 128MB: 11585k | |
1469 | * 256MB: 16384k | |
1470 | * 512MB: 23170k | |
1471 | * 1GB: 32768k | |
1472 | * 2GB: 46340k | |
1473 | * 4GB: 65536k | |
1474 | * 8GB: 92681k | |
1475 | * 16GB: 131072k | |
1476 | * | |
1477 | * This allows larger machines to have larger/more transfers. | |
1478 | * Limit the default to 256M | |
1479 | */ | |
1480 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1481 | if (nfs_congestion_kb > 256*1024) | |
1482 | nfs_congestion_kb = 256*1024; | |
1483 | ||
1da177e4 LT |
1484 | return 0; |
1485 | } | |
1486 | ||
266bee88 | 1487 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1488 | { |
1489 | mempool_destroy(nfs_commit_mempool); | |
1490 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1491 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1492 | } |
1493 |