Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
39279cc3 CM |
19 | #include <linux/fs.h> |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/time.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/smp_lock.h> | |
26 | #include <linux/backing-dev.h> | |
27 | #include <linux/mpage.h> | |
28 | #include <linux/swap.h> | |
29 | #include <linux/writeback.h> | |
30 | #include <linux/statfs.h> | |
31 | #include <linux/compat.h> | |
92fee66d | 32 | #include <linux/version.h> |
39279cc3 CM |
33 | #include "ctree.h" |
34 | #include "disk-io.h" | |
35 | #include "transaction.h" | |
36 | #include "btrfs_inode.h" | |
37 | #include "ioctl.h" | |
38 | #include "print-tree.h" | |
e02119d5 CM |
39 | #include "tree-log.h" |
40 | #include "locking.h" | |
12fa8ec6 | 41 | #include "compat.h" |
39279cc3 CM |
42 | |
43 | ||
a1b32a59 CM |
44 | static int noinline btrfs_copy_from_user(loff_t pos, int num_pages, |
45 | int write_bytes, | |
46 | struct page **prepared_pages, | |
47 | const char __user * buf) | |
39279cc3 CM |
48 | { |
49 | long page_fault = 0; | |
50 | int i; | |
51 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
52 | ||
53 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
54 | size_t count = min_t(size_t, | |
55 | PAGE_CACHE_SIZE - offset, write_bytes); | |
56 | struct page *page = prepared_pages[i]; | |
57 | fault_in_pages_readable(buf, count); | |
58 | ||
59 | /* Copy data from userspace to the current page */ | |
60 | kmap(page); | |
61 | page_fault = __copy_from_user(page_address(page) + offset, | |
62 | buf, count); | |
63 | /* Flush processor's dcache for this page */ | |
64 | flush_dcache_page(page); | |
65 | kunmap(page); | |
66 | buf += count; | |
67 | write_bytes -= count; | |
68 | ||
69 | if (page_fault) | |
70 | break; | |
71 | } | |
72 | return page_fault ? -EFAULT : 0; | |
73 | } | |
74 | ||
a1b32a59 | 75 | static void noinline btrfs_drop_pages(struct page **pages, size_t num_pages) |
39279cc3 CM |
76 | { |
77 | size_t i; | |
78 | for (i = 0; i < num_pages; i++) { | |
79 | if (!pages[i]) | |
80 | break; | |
4a096752 | 81 | ClearPageChecked(pages[i]); |
39279cc3 CM |
82 | unlock_page(pages[i]); |
83 | mark_page_accessed(pages[i]); | |
84 | page_cache_release(pages[i]); | |
85 | } | |
86 | } | |
87 | ||
98ed5174 | 88 | static int noinline insert_inline_extent(struct btrfs_trans_handle *trans, |
a52d9a80 | 89 | struct btrfs_root *root, struct inode *inode, |
3326d1b0 CM |
90 | u64 offset, size_t size, |
91 | struct page **pages, size_t page_offset, | |
92 | int num_pages) | |
54aa1f4d CM |
93 | { |
94 | struct btrfs_key key; | |
95 | struct btrfs_path *path; | |
5f39d397 CM |
96 | struct extent_buffer *leaf; |
97 | char *kaddr; | |
98 | unsigned long ptr; | |
54aa1f4d | 99 | struct btrfs_file_extent_item *ei; |
3326d1b0 | 100 | struct page *page; |
54aa1f4d CM |
101 | u32 datasize; |
102 | int err = 0; | |
103 | int ret; | |
3326d1b0 CM |
104 | int i; |
105 | ssize_t cur_size; | |
54aa1f4d CM |
106 | |
107 | path = btrfs_alloc_path(); | |
108 | if (!path) | |
109 | return -ENOMEM; | |
110 | ||
54aa1f4d CM |
111 | btrfs_set_trans_block_group(trans, inode); |
112 | ||
113 | key.objectid = inode->i_ino; | |
114 | key.offset = offset; | |
54aa1f4d | 115 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
54aa1f4d | 116 | |
3326d1b0 CM |
117 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
118 | if (ret < 0) { | |
54aa1f4d CM |
119 | err = ret; |
120 | goto fail; | |
121 | } | |
3326d1b0 | 122 | if (ret == 1) { |
179e29e4 CM |
123 | struct btrfs_key found_key; |
124 | ||
125 | if (path->slots[0] == 0) | |
126 | goto insert; | |
127 | ||
3326d1b0 CM |
128 | path->slots[0]--; |
129 | leaf = path->nodes[0]; | |
179e29e4 CM |
130 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
131 | ||
132 | if (found_key.objectid != inode->i_ino) | |
133 | goto insert; | |
134 | ||
135 | if (found_key.type != BTRFS_EXTENT_DATA_KEY) | |
136 | goto insert; | |
3326d1b0 CM |
137 | ei = btrfs_item_ptr(leaf, path->slots[0], |
138 | struct btrfs_file_extent_item); | |
139 | ||
140 | if (btrfs_file_extent_type(leaf, ei) != | |
141 | BTRFS_FILE_EXTENT_INLINE) { | |
142 | goto insert; | |
143 | } | |
144 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
145 | ret = 0; | |
146 | } | |
147 | if (ret == 0) { | |
148 | u32 found_size; | |
18f16f7b | 149 | u64 found_end; |
3326d1b0 CM |
150 | |
151 | leaf = path->nodes[0]; | |
152 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
153 | struct btrfs_file_extent_item); | |
154 | ||
155 | if (btrfs_file_extent_type(leaf, ei) != | |
156 | BTRFS_FILE_EXTENT_INLINE) { | |
157 | err = ret; | |
158 | btrfs_print_leaf(root, leaf); | |
159 | printk("found wasn't inline offset %Lu inode %lu\n", | |
160 | offset, inode->i_ino); | |
161 | goto fail; | |
162 | } | |
3326d1b0 CM |
163 | found_size = btrfs_file_extent_inline_len(leaf, |
164 | btrfs_item_nr(leaf, path->slots[0])); | |
18f16f7b | 165 | found_end = key.offset + found_size; |
3326d1b0 | 166 | |
18f16f7b | 167 | if (found_end < offset + size) { |
3326d1b0 CM |
168 | btrfs_release_path(root, path); |
169 | ret = btrfs_search_slot(trans, root, &key, path, | |
18f16f7b | 170 | offset + size - found_end, 1); |
3326d1b0 | 171 | BUG_ON(ret != 0); |
179e29e4 | 172 | |
3326d1b0 | 173 | ret = btrfs_extend_item(trans, root, path, |
18f16f7b | 174 | offset + size - found_end); |
3326d1b0 CM |
175 | if (ret) { |
176 | err = ret; | |
177 | goto fail; | |
178 | } | |
179 | leaf = path->nodes[0]; | |
180 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
181 | struct btrfs_file_extent_item); | |
9069218d | 182 | inode->i_blocks += (offset + size - found_end) >> 9; |
3326d1b0 | 183 | } |
18f16f7b Y |
184 | if (found_end < offset) { |
185 | ptr = btrfs_file_extent_inline_start(ei) + found_size; | |
186 | memset_extent_buffer(leaf, 0, ptr, offset - found_end); | |
187 | } | |
3326d1b0 CM |
188 | } else { |
189 | insert: | |
190 | btrfs_release_path(root, path); | |
18f16f7b | 191 | datasize = offset + size - key.offset; |
9069218d | 192 | inode->i_blocks += datasize >> 9; |
18f16f7b | 193 | datasize = btrfs_file_extent_calc_inline_size(datasize); |
3326d1b0 CM |
194 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
195 | datasize); | |
196 | if (ret) { | |
197 | err = ret; | |
198 | printk("got bad ret %d\n", ret); | |
199 | goto fail; | |
200 | } | |
201 | leaf = path->nodes[0]; | |
202 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
203 | struct btrfs_file_extent_item); | |
204 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
205 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
206 | } | |
18f16f7b | 207 | ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset; |
3326d1b0 CM |
208 | |
209 | cur_size = size; | |
210 | i = 0; | |
211 | while (size > 0) { | |
212 | page = pages[i]; | |
213 | kaddr = kmap_atomic(page, KM_USER0); | |
ae2f5411 | 214 | cur_size = min_t(size_t, PAGE_CACHE_SIZE - page_offset, size); |
3326d1b0 CM |
215 | write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size); |
216 | kunmap_atomic(kaddr, KM_USER0); | |
217 | page_offset = 0; | |
218 | ptr += cur_size; | |
219 | size -= cur_size; | |
220 | if (i >= num_pages) { | |
221 | printk("i %d num_pages %d\n", i, num_pages); | |
222 | } | |
223 | i++; | |
224 | } | |
5f39d397 | 225 | btrfs_mark_buffer_dirty(leaf); |
54aa1f4d CM |
226 | fail: |
227 | btrfs_free_path(path); | |
54aa1f4d CM |
228 | return err; |
229 | } | |
230 | ||
98ed5174 | 231 | static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, |
39279cc3 CM |
232 | struct btrfs_root *root, |
233 | struct file *file, | |
234 | struct page **pages, | |
235 | size_t num_pages, | |
236 | loff_t pos, | |
237 | size_t write_bytes) | |
238 | { | |
39279cc3 | 239 | int err = 0; |
a52d9a80 | 240 | int i; |
6da6abae | 241 | struct inode *inode = fdentry(file)->d_inode; |
d1310b2e | 242 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
db94535d CM |
243 | u64 hint_byte; |
244 | u64 num_bytes; | |
a52d9a80 CM |
245 | u64 start_pos; |
246 | u64 end_of_last_block; | |
247 | u64 end_pos = pos + write_bytes; | |
dcfec0dc | 248 | u64 inline_size; |
ee6e6504 | 249 | int did_inline = 0; |
a52d9a80 | 250 | loff_t isize = i_size_read(inode); |
39279cc3 | 251 | |
5f39d397 | 252 | start_pos = pos & ~((u64)root->sectorsize - 1); |
db94535d CM |
253 | num_bytes = (write_bytes + pos - start_pos + |
254 | root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
39279cc3 | 255 | |
db94535d CM |
256 | end_of_last_block = start_pos + num_bytes - 1; |
257 | ||
d1310b2e | 258 | lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
37d1aeee | 259 | trans = btrfs_join_transaction(root, 1); |
a52d9a80 CM |
260 | if (!trans) { |
261 | err = -ENOMEM; | |
262 | goto out_unlock; | |
263 | } | |
264 | btrfs_set_trans_block_group(trans, inode); | |
db94535d | 265 | hint_byte = 0; |
a52d9a80 CM |
266 | |
267 | if ((end_of_last_block & 4095) == 0) { | |
9433063b | 268 | printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block); |
a52d9a80 | 269 | } |
d1310b2e | 270 | set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
a52d9a80 CM |
271 | |
272 | /* FIXME...EIEIO, ENOSPC and more */ | |
a52d9a80 | 273 | /* insert any holes we need to create */ |
1b1e2135 | 274 | if (isize < start_pos) { |
a52d9a80 CM |
275 | u64 last_pos_in_file; |
276 | u64 hole_size; | |
5f39d397 | 277 | u64 mask = root->sectorsize - 1; |
a52d9a80 | 278 | last_pos_in_file = (isize + mask) & ~mask; |
1b1e2135 | 279 | hole_size = (start_pos - last_pos_in_file + mask) & ~mask; |
e6dcd2dc CM |
280 | if (hole_size > 0) { |
281 | btrfs_wait_ordered_range(inode, last_pos_in_file, | |
282 | last_pos_in_file + hole_size); | |
ee6e6504 | 283 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
2bf5a725 CM |
284 | err = btrfs_drop_extents(trans, root, inode, |
285 | last_pos_in_file, | |
286 | last_pos_in_file + hole_size, | |
3326d1b0 | 287 | last_pos_in_file, |
db94535d | 288 | &hint_byte); |
2bf5a725 CM |
289 | if (err) |
290 | goto failed; | |
291 | ||
a52d9a80 CM |
292 | err = btrfs_insert_file_extent(trans, root, |
293 | inode->i_ino, | |
294 | last_pos_in_file, | |
f2eb0a24 | 295 | 0, 0, hole_size, 0); |
d1310b2e | 296 | btrfs_drop_extent_cache(inode, last_pos_in_file, |
5b21f2ed | 297 | last_pos_in_file + hole_size - 1, 0); |
ee6e6504 | 298 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
5f56406a | 299 | btrfs_check_file(root, inode); |
a52d9a80 CM |
300 | } |
301 | if (err) | |
39279cc3 | 302 | goto failed; |
a52d9a80 CM |
303 | } |
304 | ||
305 | /* | |
306 | * either allocate an extent for the new bytes or setup the key | |
307 | * to show we are doing inline data in the extent | |
308 | */ | |
3326d1b0 CM |
309 | inline_size = end_pos; |
310 | if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) || | |
6f568d35 CM |
311 | inline_size > root->fs_info->max_inline || |
312 | (inline_size & (root->sectorsize -1)) == 0 || | |
3326d1b0 | 313 | inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) { |
e6dcd2dc CM |
314 | /* check for reserved extents on each page, we don't want |
315 | * to reset the delalloc bit on things that already have | |
316 | * extents reserved. | |
317 | */ | |
ea8c2819 | 318 | btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block); |
a52d9a80 CM |
319 | for (i = 0; i < num_pages; i++) { |
320 | struct page *p = pages[i]; | |
321 | SetPageUptodate(p); | |
247e743c | 322 | ClearPageChecked(p); |
b888db2b | 323 | set_page_dirty(p); |
39279cc3 | 324 | } |
a52d9a80 | 325 | } else { |
3326d1b0 | 326 | u64 aligned_end; |
b888db2b | 327 | /* step one, delete the existing extents in this range */ |
3326d1b0 CM |
328 | aligned_end = (pos + write_bytes + root->sectorsize - 1) & |
329 | ~((u64)root->sectorsize - 1); | |
ee6e6504 | 330 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
2bf5a725 | 331 | err = btrfs_drop_extents(trans, root, inode, start_pos, |
179e29e4 | 332 | aligned_end, aligned_end, &hint_byte); |
2bf5a725 CM |
333 | if (err) |
334 | goto failed; | |
dcfec0dc Y |
335 | if (isize > inline_size) |
336 | inline_size = min_t(u64, isize, aligned_end); | |
337 | inline_size -= start_pos; | |
a52d9a80 | 338 | err = insert_inline_extent(trans, root, inode, start_pos, |
dcfec0dc | 339 | inline_size, pages, 0, num_pages); |
5b21f2ed | 340 | btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1, 0); |
a52d9a80 | 341 | BUG_ON(err); |
ee6e6504 | 342 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
f87f057b CM |
343 | |
344 | /* | |
345 | * an ugly way to do all the prop accounting around | |
346 | * the page bits and mapping tags | |
347 | */ | |
348 | set_page_writeback(pages[0]); | |
349 | end_page_writeback(pages[0]); | |
ee6e6504 | 350 | did_inline = 1; |
a52d9a80 CM |
351 | } |
352 | if (end_pos > isize) { | |
353 | i_size_write(inode, end_pos); | |
ee6e6504 CM |
354 | if (did_inline) |
355 | BTRFS_I(inode)->disk_i_size = end_pos; | |
a52d9a80 | 356 | btrfs_update_inode(trans, root, inode); |
39279cc3 CM |
357 | } |
358 | failed: | |
017e5369 | 359 | err = btrfs_end_transaction(trans, root); |
a52d9a80 | 360 | out_unlock: |
d1310b2e | 361 | unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
39279cc3 CM |
362 | return err; |
363 | } | |
364 | ||
5b21f2ed ZY |
365 | int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, |
366 | int skip_pinned) | |
a52d9a80 CM |
367 | { |
368 | struct extent_map *em; | |
3b951516 CM |
369 | struct extent_map *split = NULL; |
370 | struct extent_map *split2 = NULL; | |
a52d9a80 | 371 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
39b5637f | 372 | u64 len = end - start + 1; |
3b951516 CM |
373 | int ret; |
374 | int testend = 1; | |
5b21f2ed | 375 | unsigned long flags; |
a52d9a80 | 376 | |
e6dcd2dc | 377 | WARN_ON(end < start); |
3b951516 | 378 | if (end == (u64)-1) { |
39b5637f | 379 | len = (u64)-1; |
3b951516 CM |
380 | testend = 0; |
381 | } | |
a52d9a80 | 382 | while(1) { |
3b951516 CM |
383 | if (!split) |
384 | split = alloc_extent_map(GFP_NOFS); | |
385 | if (!split2) | |
386 | split2 = alloc_extent_map(GFP_NOFS); | |
387 | ||
d1310b2e | 388 | spin_lock(&em_tree->lock); |
39b5637f | 389 | em = lookup_extent_mapping(em_tree, start, len); |
d1310b2e CM |
390 | if (!em) { |
391 | spin_unlock(&em_tree->lock); | |
a52d9a80 | 392 | break; |
d1310b2e | 393 | } |
5b21f2ed ZY |
394 | flags = em->flags; |
395 | if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { | |
396 | spin_unlock(&em_tree->lock); | |
397 | if (em->start <= start && | |
398 | (!testend || em->start + em->len >= start + len)) { | |
399 | free_extent_map(em); | |
400 | break; | |
401 | } | |
402 | if (start < em->start) { | |
403 | len = em->start - start; | |
404 | } else { | |
405 | len = start + len - (em->start + em->len); | |
406 | start = em->start + em->len; | |
407 | } | |
408 | free_extent_map(em); | |
409 | continue; | |
410 | } | |
3ce7e67a | 411 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
a52d9a80 | 412 | remove_extent_mapping(em_tree, em); |
3b951516 CM |
413 | |
414 | if (em->block_start < EXTENT_MAP_LAST_BYTE && | |
415 | em->start < start) { | |
416 | split->start = em->start; | |
417 | split->len = start - em->start; | |
418 | split->block_start = em->block_start; | |
419 | split->bdev = em->bdev; | |
5b21f2ed | 420 | split->flags = flags; |
3b951516 CM |
421 | ret = add_extent_mapping(em_tree, split); |
422 | BUG_ON(ret); | |
423 | free_extent_map(split); | |
424 | split = split2; | |
425 | split2 = NULL; | |
426 | } | |
427 | if (em->block_start < EXTENT_MAP_LAST_BYTE && | |
428 | testend && em->start + em->len > start + len) { | |
429 | u64 diff = start + len - em->start; | |
430 | ||
431 | split->start = start + len; | |
432 | split->len = em->start + em->len - (start + len); | |
433 | split->bdev = em->bdev; | |
5b21f2ed | 434 | split->flags = flags; |
3b951516 CM |
435 | |
436 | split->block_start = em->block_start + diff; | |
437 | ||
438 | ret = add_extent_mapping(em_tree, split); | |
439 | BUG_ON(ret); | |
440 | free_extent_map(split); | |
441 | split = NULL; | |
442 | } | |
d1310b2e CM |
443 | spin_unlock(&em_tree->lock); |
444 | ||
a52d9a80 CM |
445 | /* once for us */ |
446 | free_extent_map(em); | |
447 | /* once for the tree*/ | |
448 | free_extent_map(em); | |
449 | } | |
3b951516 CM |
450 | if (split) |
451 | free_extent_map(split); | |
452 | if (split2) | |
453 | free_extent_map(split2); | |
a52d9a80 CM |
454 | return 0; |
455 | } | |
456 | ||
5f56406a CM |
457 | int btrfs_check_file(struct btrfs_root *root, struct inode *inode) |
458 | { | |
459 | return 0; | |
460 | #if 0 | |
461 | struct btrfs_path *path; | |
462 | struct btrfs_key found_key; | |
463 | struct extent_buffer *leaf; | |
464 | struct btrfs_file_extent_item *extent; | |
465 | u64 last_offset = 0; | |
466 | int nritems; | |
467 | int slot; | |
468 | int found_type; | |
469 | int ret; | |
470 | int err = 0; | |
471 | u64 extent_end = 0; | |
472 | ||
473 | path = btrfs_alloc_path(); | |
474 | ret = btrfs_lookup_file_extent(NULL, root, path, inode->i_ino, | |
475 | last_offset, 0); | |
476 | while(1) { | |
477 | nritems = btrfs_header_nritems(path->nodes[0]); | |
478 | if (path->slots[0] >= nritems) { | |
479 | ret = btrfs_next_leaf(root, path); | |
480 | if (ret) | |
481 | goto out; | |
482 | nritems = btrfs_header_nritems(path->nodes[0]); | |
483 | } | |
484 | slot = path->slots[0]; | |
485 | leaf = path->nodes[0]; | |
486 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
487 | if (found_key.objectid != inode->i_ino) | |
488 | break; | |
489 | if (found_key.type != BTRFS_EXTENT_DATA_KEY) | |
490 | goto out; | |
491 | ||
9069218d | 492 | if (found_key.offset < last_offset) { |
5f56406a CM |
493 | WARN_ON(1); |
494 | btrfs_print_leaf(root, leaf); | |
495 | printk("inode %lu found offset %Lu expected %Lu\n", | |
496 | inode->i_ino, found_key.offset, last_offset); | |
497 | err = 1; | |
498 | goto out; | |
499 | } | |
500 | extent = btrfs_item_ptr(leaf, slot, | |
501 | struct btrfs_file_extent_item); | |
502 | found_type = btrfs_file_extent_type(leaf, extent); | |
503 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
504 | extent_end = found_key.offset + | |
505 | btrfs_file_extent_num_bytes(leaf, extent); | |
506 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
507 | struct btrfs_item *item; | |
508 | item = btrfs_item_nr(leaf, slot); | |
509 | extent_end = found_key.offset + | |
510 | btrfs_file_extent_inline_len(leaf, item); | |
511 | extent_end = (extent_end + root->sectorsize - 1) & | |
512 | ~((u64)root->sectorsize -1 ); | |
513 | } | |
514 | last_offset = extent_end; | |
515 | path->slots[0]++; | |
516 | } | |
9069218d | 517 | if (0 && last_offset < inode->i_size) { |
5f56406a CM |
518 | WARN_ON(1); |
519 | btrfs_print_leaf(root, leaf); | |
520 | printk("inode %lu found offset %Lu size %Lu\n", inode->i_ino, | |
521 | last_offset, inode->i_size); | |
522 | err = 1; | |
523 | ||
524 | } | |
525 | out: | |
526 | btrfs_free_path(path); | |
527 | return err; | |
528 | #endif | |
529 | } | |
530 | ||
39279cc3 CM |
531 | /* |
532 | * this is very complex, but the basic idea is to drop all extents | |
533 | * in the range start - end. hint_block is filled in with a block number | |
534 | * that would be a good hint to the block allocator for this file. | |
535 | * | |
536 | * If an extent intersects the range but is not entirely inside the range | |
537 | * it is either truncated or split. Anything entirely inside the range | |
538 | * is deleted from the tree. | |
539 | */ | |
a1b32a59 | 540 | int noinline btrfs_drop_extents(struct btrfs_trans_handle *trans, |
39279cc3 | 541 | struct btrfs_root *root, struct inode *inode, |
00f5c795 | 542 | u64 start, u64 end, u64 inline_limit, u64 *hint_byte) |
39279cc3 | 543 | { |
00f5c795 CM |
544 | u64 extent_end = 0; |
545 | u64 search_start = start; | |
31840ae1 ZY |
546 | u64 leaf_start; |
547 | u64 root_gen; | |
548 | u64 root_owner; | |
5f39d397 | 549 | struct extent_buffer *leaf; |
39279cc3 | 550 | struct btrfs_file_extent_item *extent; |
39279cc3 | 551 | struct btrfs_path *path; |
00f5c795 CM |
552 | struct btrfs_key key; |
553 | struct btrfs_file_extent_item old; | |
554 | int keep; | |
555 | int slot; | |
39279cc3 CM |
556 | int bookend; |
557 | int found_type; | |
558 | int found_extent; | |
559 | int found_inline; | |
ccd467d6 | 560 | int recow; |
00f5c795 | 561 | int ret; |
39279cc3 | 562 | |
5b21f2ed | 563 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
a52d9a80 | 564 | |
39279cc3 CM |
565 | path = btrfs_alloc_path(); |
566 | if (!path) | |
567 | return -ENOMEM; | |
568 | while(1) { | |
ccd467d6 | 569 | recow = 0; |
39279cc3 CM |
570 | btrfs_release_path(root, path); |
571 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
572 | search_start, -1); | |
573 | if (ret < 0) | |
574 | goto out; | |
575 | if (ret > 0) { | |
576 | if (path->slots[0] == 0) { | |
577 | ret = 0; | |
578 | goto out; | |
579 | } | |
580 | path->slots[0]--; | |
581 | } | |
8c2383c3 | 582 | next_slot: |
39279cc3 CM |
583 | keep = 0; |
584 | bookend = 0; | |
585 | found_extent = 0; | |
586 | found_inline = 0; | |
31840ae1 ZY |
587 | leaf_start = 0; |
588 | root_gen = 0; | |
589 | root_owner = 0; | |
39279cc3 | 590 | extent = NULL; |
5f39d397 | 591 | leaf = path->nodes[0]; |
39279cc3 | 592 | slot = path->slots[0]; |
8c2383c3 | 593 | ret = 0; |
5f39d397 | 594 | btrfs_item_key_to_cpu(leaf, &key, slot); |
7261009c Y |
595 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY && |
596 | key.offset >= end) { | |
39279cc3 CM |
597 | goto out; |
598 | } | |
7261009c Y |
599 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
600 | key.objectid != inode->i_ino) { | |
39279cc3 CM |
601 | goto out; |
602 | } | |
ccd467d6 CM |
603 | if (recow) { |
604 | search_start = key.offset; | |
605 | continue; | |
606 | } | |
8c2383c3 CM |
607 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
608 | extent = btrfs_item_ptr(leaf, slot, | |
609 | struct btrfs_file_extent_item); | |
5f39d397 | 610 | found_type = btrfs_file_extent_type(leaf, extent); |
8c2383c3 | 611 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
257d0ce3 CM |
612 | extent_end = |
613 | btrfs_file_extent_disk_bytenr(leaf, | |
614 | extent); | |
615 | if (extent_end) | |
616 | *hint_byte = extent_end; | |
617 | ||
8c2383c3 | 618 | extent_end = key.offset + |
db94535d | 619 | btrfs_file_extent_num_bytes(leaf, extent); |
8c2383c3 CM |
620 | found_extent = 1; |
621 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 CM |
622 | struct btrfs_item *item; |
623 | item = btrfs_item_nr(leaf, slot); | |
8c2383c3 CM |
624 | found_inline = 1; |
625 | extent_end = key.offset + | |
5f39d397 | 626 | btrfs_file_extent_inline_len(leaf, item); |
8c2383c3 CM |
627 | } |
628 | } else { | |
629 | extent_end = search_start; | |
39279cc3 CM |
630 | } |
631 | ||
632 | /* we found nothing we can drop */ | |
8c2383c3 CM |
633 | if ((!found_extent && !found_inline) || |
634 | search_start >= extent_end) { | |
635 | int nextret; | |
636 | u32 nritems; | |
5f39d397 | 637 | nritems = btrfs_header_nritems(leaf); |
8c2383c3 CM |
638 | if (slot >= nritems - 1) { |
639 | nextret = btrfs_next_leaf(root, path); | |
640 | if (nextret) | |
641 | goto out; | |
ccd467d6 | 642 | recow = 1; |
8c2383c3 CM |
643 | } else { |
644 | path->slots[0]++; | |
645 | } | |
646 | goto next_slot; | |
39279cc3 CM |
647 | } |
648 | ||
39279cc3 | 649 | if (found_inline) { |
5f39d397 | 650 | u64 mask = root->sectorsize - 1; |
39279cc3 CM |
651 | search_start = (extent_end + mask) & ~mask; |
652 | } else | |
653 | search_start = extent_end; | |
6e3b9666 | 654 | if (end <= extent_end && start >= key.offset && found_inline) { |
179e29e4 | 655 | *hint_byte = EXTENT_MAP_INLINE; |
31840ae1 ZY |
656 | goto out; |
657 | } | |
658 | ||
659 | if (found_extent) { | |
660 | read_extent_buffer(leaf, &old, (unsigned long)extent, | |
661 | sizeof(old)); | |
662 | root_gen = btrfs_header_generation(leaf); | |
663 | root_owner = btrfs_header_owner(leaf); | |
664 | leaf_start = leaf->start; | |
179e29e4 | 665 | } |
31840ae1 | 666 | |
39279cc3 | 667 | if (end < extent_end && end >= key.offset) { |
179e29e4 | 668 | bookend = 1; |
0181e58f | 669 | if (found_inline && start <= key.offset) |
179e29e4 | 670 | keep = 1; |
39279cc3 | 671 | } |
39279cc3 CM |
672 | /* truncate existing extent */ |
673 | if (start > key.offset) { | |
674 | u64 new_num; | |
675 | u64 old_num; | |
676 | keep = 1; | |
5f39d397 | 677 | WARN_ON(start & (root->sectorsize - 1)); |
39279cc3 | 678 | if (found_extent) { |
db94535d CM |
679 | new_num = start - key.offset; |
680 | old_num = btrfs_file_extent_num_bytes(leaf, | |
681 | extent); | |
682 | *hint_byte = | |
683 | btrfs_file_extent_disk_bytenr(leaf, | |
684 | extent); | |
685 | if (btrfs_file_extent_disk_bytenr(leaf, | |
686 | extent)) { | |
9069218d | 687 | dec_i_blocks(inode, old_num - new_num); |
39279cc3 | 688 | } |
db94535d CM |
689 | btrfs_set_file_extent_num_bytes(leaf, extent, |
690 | new_num); | |
5f39d397 | 691 | btrfs_mark_buffer_dirty(leaf); |
00f5c795 CM |
692 | } else if (key.offset < inline_limit && |
693 | (end > extent_end) && | |
694 | (inline_limit < extent_end)) { | |
3326d1b0 CM |
695 | u32 new_size; |
696 | new_size = btrfs_file_extent_calc_inline_size( | |
00f5c795 | 697 | inline_limit - key.offset); |
9069218d CM |
698 | dec_i_blocks(inode, (extent_end - key.offset) - |
699 | (inline_limit - key.offset)); | |
3326d1b0 | 700 | btrfs_truncate_item(trans, root, path, |
179e29e4 | 701 | new_size, 1); |
39279cc3 CM |
702 | } |
703 | } | |
704 | /* delete the entire extent */ | |
705 | if (!keep) { | |
39279cc3 | 706 | ret = btrfs_del_item(trans, root, path); |
54aa1f4d | 707 | /* TODO update progress marker and return */ |
39279cc3 | 708 | BUG_ON(ret); |
39279cc3 | 709 | extent = NULL; |
31840ae1 ZY |
710 | btrfs_release_path(root, path); |
711 | /* the extent will be freed later */ | |
39279cc3 | 712 | } |
0181e58f | 713 | if (bookend && found_inline && start <= key.offset) { |
179e29e4 CM |
714 | u32 new_size; |
715 | new_size = btrfs_file_extent_calc_inline_size( | |
0181e58f | 716 | extent_end - end); |
9069218d CM |
717 | dec_i_blocks(inode, (extent_end - key.offset) - |
718 | (extent_end - end)); | |
31840ae1 ZY |
719 | ret = btrfs_truncate_item(trans, root, path, |
720 | new_size, 0); | |
721 | BUG_ON(ret); | |
179e29e4 | 722 | } |
39279cc3 CM |
723 | /* create bookend, splitting the extent in two */ |
724 | if (bookend && found_extent) { | |
31840ae1 | 725 | u64 disk_bytenr; |
39279cc3 CM |
726 | struct btrfs_key ins; |
727 | ins.objectid = inode->i_ino; | |
728 | ins.offset = end; | |
39279cc3 | 729 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); |
39279cc3 CM |
730 | btrfs_release_path(root, path); |
731 | ret = btrfs_insert_empty_item(trans, root, path, &ins, | |
732 | sizeof(*extent)); | |
31840ae1 | 733 | BUG_ON(ret); |
8c2383c3 | 734 | |
5f39d397 | 735 | leaf = path->nodes[0]; |
5f39d397 CM |
736 | extent = btrfs_item_ptr(leaf, path->slots[0], |
737 | struct btrfs_file_extent_item); | |
738 | write_extent_buffer(leaf, &old, | |
739 | (unsigned long)extent, sizeof(old)); | |
740 | ||
741 | btrfs_set_file_extent_offset(leaf, extent, | |
db94535d CM |
742 | le64_to_cpu(old.offset) + end - key.offset); |
743 | WARN_ON(le64_to_cpu(old.num_bytes) < | |
744 | (extent_end - end)); | |
745 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
746 | extent_end - end); | |
5f39d397 | 747 | btrfs_set_file_extent_type(leaf, extent, |
39279cc3 | 748 | BTRFS_FILE_EXTENT_REG); |
db94535d | 749 | |
39279cc3 | 750 | btrfs_mark_buffer_dirty(path->nodes[0]); |
31840ae1 ZY |
751 | |
752 | disk_bytenr = le64_to_cpu(old.disk_bytenr); | |
753 | if (disk_bytenr != 0) { | |
754 | ret = btrfs_inc_extent_ref(trans, root, | |
755 | disk_bytenr, | |
756 | le64_to_cpu(old.disk_num_bytes), | |
757 | leaf->start, | |
758 | root->root_key.objectid, | |
759 | trans->transid, | |
760 | ins.objectid, ins.offset); | |
761 | BUG_ON(ret); | |
762 | } | |
763 | btrfs_release_path(root, path); | |
764 | if (disk_bytenr != 0) { | |
39279cc3 | 765 | inode->i_blocks += |
db94535d CM |
766 | btrfs_file_extent_num_bytes(leaf, |
767 | extent) >> 9; | |
39279cc3 | 768 | } |
31840ae1 ZY |
769 | } |
770 | ||
771 | if (found_extent && !keep) { | |
772 | u64 disk_bytenr = le64_to_cpu(old.disk_bytenr); | |
773 | ||
774 | if (disk_bytenr != 0) { | |
775 | dec_i_blocks(inode, le64_to_cpu(old.num_bytes)); | |
776 | ret = btrfs_free_extent(trans, root, | |
777 | disk_bytenr, | |
778 | le64_to_cpu(old.disk_num_bytes), | |
779 | leaf_start, root_owner, | |
780 | root_gen, key.objectid, | |
781 | key.offset, 0); | |
782 | BUG_ON(ret); | |
783 | *hint_byte = disk_bytenr; | |
784 | } | |
785 | } | |
786 | ||
787 | if (search_start >= end) { | |
39279cc3 CM |
788 | ret = 0; |
789 | goto out; | |
790 | } | |
791 | } | |
792 | out: | |
793 | btrfs_free_path(path); | |
9069218d | 794 | btrfs_check_file(root, inode); |
39279cc3 CM |
795 | return ret; |
796 | } | |
797 | ||
798 | /* | |
799 | * this gets pages into the page cache and locks them down | |
800 | */ | |
a1b32a59 | 801 | static int noinline prepare_pages(struct btrfs_root *root, struct file *file, |
98ed5174 CM |
802 | struct page **pages, size_t num_pages, |
803 | loff_t pos, unsigned long first_index, | |
804 | unsigned long last_index, size_t write_bytes) | |
39279cc3 CM |
805 | { |
806 | int i; | |
807 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
6da6abae | 808 | struct inode *inode = fdentry(file)->d_inode; |
39279cc3 | 809 | int err = 0; |
8c2383c3 | 810 | u64 start_pos; |
e6dcd2dc | 811 | u64 last_pos; |
8c2383c3 | 812 | |
5f39d397 | 813 | start_pos = pos & ~((u64)root->sectorsize - 1); |
e6dcd2dc | 814 | last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT; |
39279cc3 CM |
815 | |
816 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
e6dcd2dc | 817 | again: |
39279cc3 CM |
818 | for (i = 0; i < num_pages; i++) { |
819 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
820 | if (!pages[i]) { | |
821 | err = -ENOMEM; | |
a52d9a80 | 822 | BUG_ON(1); |
39279cc3 | 823 | } |
ccd467d6 | 824 | wait_on_page_writeback(pages[i]); |
39279cc3 | 825 | } |
0762704b | 826 | if (start_pos < inode->i_size) { |
e6dcd2dc | 827 | struct btrfs_ordered_extent *ordered; |
d99cb30a CM |
828 | lock_extent(&BTRFS_I(inode)->io_tree, |
829 | start_pos, last_pos - 1, GFP_NOFS); | |
e6dcd2dc CM |
830 | ordered = btrfs_lookup_first_ordered_extent(inode, last_pos -1); |
831 | if (ordered && | |
832 | ordered->file_offset + ordered->len > start_pos && | |
833 | ordered->file_offset < last_pos) { | |
834 | btrfs_put_ordered_extent(ordered); | |
835 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
836 | start_pos, last_pos - 1, GFP_NOFS); | |
837 | for (i = 0; i < num_pages; i++) { | |
838 | unlock_page(pages[i]); | |
839 | page_cache_release(pages[i]); | |
840 | } | |
841 | btrfs_wait_ordered_range(inode, start_pos, | |
842 | last_pos - start_pos); | |
843 | goto again; | |
844 | } | |
845 | if (ordered) | |
846 | btrfs_put_ordered_extent(ordered); | |
847 | ||
0762704b CM |
848 | clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos, |
849 | last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC, | |
850 | GFP_NOFS); | |
d99cb30a CM |
851 | unlock_extent(&BTRFS_I(inode)->io_tree, |
852 | start_pos, last_pos - 1, GFP_NOFS); | |
0762704b | 853 | } |
e6dcd2dc | 854 | for (i = 0; i < num_pages; i++) { |
f87f057b | 855 | clear_page_dirty_for_io(pages[i]); |
e6dcd2dc CM |
856 | set_page_extent_mapped(pages[i]); |
857 | WARN_ON(!PageLocked(pages[i])); | |
858 | } | |
39279cc3 | 859 | return 0; |
39279cc3 CM |
860 | } |
861 | ||
862 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
863 | size_t count, loff_t *ppos) | |
864 | { | |
865 | loff_t pos; | |
2ff3e9b6 CM |
866 | loff_t start_pos; |
867 | ssize_t num_written = 0; | |
868 | ssize_t err = 0; | |
39279cc3 | 869 | int ret = 0; |
6da6abae | 870 | struct inode *inode = fdentry(file)->d_inode; |
39279cc3 | 871 | struct btrfs_root *root = BTRFS_I(inode)->root; |
8c2383c3 CM |
872 | struct page **pages = NULL; |
873 | int nrptrs; | |
39279cc3 CM |
874 | struct page *pinned[2]; |
875 | unsigned long first_index; | |
876 | unsigned long last_index; | |
8c2383c3 CM |
877 | |
878 | nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE, | |
879 | PAGE_CACHE_SIZE / (sizeof(struct page *))); | |
39279cc3 CM |
880 | pinned[0] = NULL; |
881 | pinned[1] = NULL; | |
2ff3e9b6 | 882 | |
39279cc3 | 883 | pos = *ppos; |
2ff3e9b6 CM |
884 | start_pos = pos; |
885 | ||
39279cc3 CM |
886 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
887 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
888 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
889 | if (err) | |
1832a6d5 | 890 | goto out_nolock; |
39279cc3 | 891 | if (count == 0) |
1832a6d5 | 892 | goto out_nolock; |
2b1f55b0 | 893 | |
0ee0fda0 | 894 | err = file_remove_suid(file); |
39279cc3 | 895 | if (err) |
1832a6d5 | 896 | goto out_nolock; |
39279cc3 CM |
897 | file_update_time(file); |
898 | ||
8c2383c3 | 899 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
39279cc3 CM |
900 | |
901 | mutex_lock(&inode->i_mutex); | |
902 | first_index = pos >> PAGE_CACHE_SHIFT; | |
903 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
904 | ||
409c6118 CM |
905 | /* |
906 | * if this is a nodatasum mount, force summing off for the inode | |
907 | * all the time. That way a later mount with summing on won't | |
908 | * get confused | |
909 | */ | |
910 | if (btrfs_test_opt(root, NODATASUM)) | |
911 | btrfs_set_flag(inode, NODATASUM); | |
912 | ||
39279cc3 CM |
913 | /* |
914 | * there are lots of better ways to do this, but this code | |
915 | * makes sure the first and last page in the file range are | |
916 | * up to date and ready for cow | |
917 | */ | |
918 | if ((pos & (PAGE_CACHE_SIZE - 1))) { | |
919 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
920 | if (!PageUptodate(pinned[0])) { | |
9ebefb18 | 921 | ret = btrfs_readpage(NULL, pinned[0]); |
39279cc3 CM |
922 | BUG_ON(ret); |
923 | wait_on_page_locked(pinned[0]); | |
924 | } else { | |
925 | unlock_page(pinned[0]); | |
926 | } | |
927 | } | |
928 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { | |
929 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
930 | if (!PageUptodate(pinned[1])) { | |
9ebefb18 | 931 | ret = btrfs_readpage(NULL, pinned[1]); |
39279cc3 CM |
932 | BUG_ON(ret); |
933 | wait_on_page_locked(pinned[1]); | |
934 | } else { | |
935 | unlock_page(pinned[1]); | |
936 | } | |
937 | } | |
938 | ||
39279cc3 CM |
939 | while(count > 0) { |
940 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
11bd143f CM |
941 | size_t write_bytes = min(count, nrptrs * |
942 | (size_t)PAGE_CACHE_SIZE - | |
8c2383c3 | 943 | offset); |
39279cc3 CM |
944 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> |
945 | PAGE_CACHE_SHIFT; | |
946 | ||
8c2383c3 | 947 | WARN_ON(num_pages > nrptrs); |
39279cc3 | 948 | memset(pages, 0, sizeof(pages)); |
1832a6d5 | 949 | |
1832a6d5 | 950 | ret = btrfs_check_free_space(root, write_bytes, 0); |
1832a6d5 CM |
951 | if (ret) |
952 | goto out; | |
953 | ||
39279cc3 CM |
954 | ret = prepare_pages(root, file, pages, num_pages, |
955 | pos, first_index, last_index, | |
8c2383c3 | 956 | write_bytes); |
54aa1f4d CM |
957 | if (ret) |
958 | goto out; | |
39279cc3 | 959 | |
39279cc3 CM |
960 | ret = btrfs_copy_from_user(pos, num_pages, |
961 | write_bytes, pages, buf); | |
54aa1f4d CM |
962 | if (ret) { |
963 | btrfs_drop_pages(pages, num_pages); | |
964 | goto out; | |
965 | } | |
39279cc3 CM |
966 | |
967 | ret = dirty_and_release_pages(NULL, root, file, pages, | |
968 | num_pages, pos, write_bytes); | |
39279cc3 | 969 | btrfs_drop_pages(pages, num_pages); |
54aa1f4d CM |
970 | if (ret) |
971 | goto out; | |
39279cc3 CM |
972 | |
973 | buf += write_bytes; | |
974 | count -= write_bytes; | |
975 | pos += write_bytes; | |
976 | num_written += write_bytes; | |
977 | ||
8c2383c3 | 978 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages); |
448d640b CM |
979 | if (num_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
980 | btrfs_btree_balance_dirty(root, 1); | |
ab78c84d | 981 | btrfs_throttle(root); |
39279cc3 CM |
982 | cond_resched(); |
983 | } | |
39279cc3 | 984 | out: |
1832a6d5 | 985 | mutex_unlock(&inode->i_mutex); |
5b92ee72 | 986 | |
1832a6d5 | 987 | out_nolock: |
8c2383c3 | 988 | kfree(pages); |
39279cc3 CM |
989 | if (pinned[0]) |
990 | page_cache_release(pinned[0]); | |
991 | if (pinned[1]) | |
992 | page_cache_release(pinned[1]); | |
993 | *ppos = pos; | |
2ff3e9b6 CM |
994 | |
995 | if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) { | |
e02119d5 CM |
996 | struct btrfs_trans_handle *trans; |
997 | ||
998 | err = btrfs_fdatawrite_range(inode->i_mapping, start_pos, | |
999 | start_pos + num_written -1, | |
1000 | WB_SYNC_NONE); | |
1001 | if (err < 0) | |
1002 | num_written = err; | |
1003 | ||
1004 | err = btrfs_wait_on_page_writeback_range(inode->i_mapping, | |
1005 | start_pos, start_pos + num_written - 1); | |
2ff3e9b6 CM |
1006 | if (err < 0) |
1007 | num_written = err; | |
e02119d5 CM |
1008 | |
1009 | trans = btrfs_start_transaction(root, 1); | |
1010 | ret = btrfs_log_dentry_safe(trans, root, file->f_dentry); | |
1011 | if (ret == 0) { | |
1012 | btrfs_sync_log(trans, root); | |
1013 | btrfs_end_transaction(trans, root); | |
1014 | } else { | |
1015 | btrfs_commit_transaction(trans, root); | |
1016 | } | |
16432985 CM |
1017 | } else if (num_written > 0 && (file->f_flags & O_DIRECT)) { |
1018 | do_sync_mapping_range(inode->i_mapping, start_pos, | |
1019 | start_pos + num_written - 1, | |
1020 | SYNC_FILE_RANGE_WRITE | | |
1021 | SYNC_FILE_RANGE_WAIT_AFTER); | |
16432985 CM |
1022 | invalidate_mapping_pages(inode->i_mapping, |
1023 | start_pos >> PAGE_CACHE_SHIFT, | |
1024 | (start_pos + num_written - 1) >> PAGE_CACHE_SHIFT); | |
2ff3e9b6 | 1025 | } |
39279cc3 | 1026 | current->backing_dev_info = NULL; |
39279cc3 CM |
1027 | return num_written ? num_written : err; |
1028 | } | |
1029 | ||
6bf13c0c | 1030 | int btrfs_release_file(struct inode * inode, struct file * filp) |
e1b81e67 | 1031 | { |
6bf13c0c SW |
1032 | if (filp->private_data) |
1033 | btrfs_ioctl_trans_end(filp); | |
e1b81e67 M |
1034 | return 0; |
1035 | } | |
1036 | ||
e02119d5 | 1037 | int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync) |
39279cc3 CM |
1038 | { |
1039 | struct inode *inode = dentry->d_inode; | |
1040 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
15ee9bc7 | 1041 | int ret = 0; |
39279cc3 CM |
1042 | struct btrfs_trans_handle *trans; |
1043 | ||
1044 | /* | |
15ee9bc7 JB |
1045 | * check the transaction that last modified this inode |
1046 | * and see if its already been committed | |
39279cc3 | 1047 | */ |
15ee9bc7 JB |
1048 | if (!BTRFS_I(inode)->last_trans) |
1049 | goto out; | |
a2135011 | 1050 | |
15ee9bc7 JB |
1051 | mutex_lock(&root->fs_info->trans_mutex); |
1052 | if (BTRFS_I(inode)->last_trans <= | |
1053 | root->fs_info->last_trans_committed) { | |
1054 | BTRFS_I(inode)->last_trans = 0; | |
1055 | mutex_unlock(&root->fs_info->trans_mutex); | |
1056 | goto out; | |
1057 | } | |
1058 | mutex_unlock(&root->fs_info->trans_mutex); | |
1059 | ||
49eb7e46 | 1060 | root->fs_info->tree_log_batch++; |
e02119d5 | 1061 | filemap_fdatawait(inode->i_mapping); |
49eb7e46 | 1062 | root->fs_info->tree_log_batch++; |
e02119d5 | 1063 | |
15ee9bc7 | 1064 | /* |
a52d9a80 CM |
1065 | * ok we haven't committed the transaction yet, lets do a commit |
1066 | */ | |
6bf13c0c SW |
1067 | if (file->private_data) |
1068 | btrfs_ioctl_trans_end(file); | |
1069 | ||
39279cc3 CM |
1070 | trans = btrfs_start_transaction(root, 1); |
1071 | if (!trans) { | |
1072 | ret = -ENOMEM; | |
1073 | goto out; | |
1074 | } | |
e02119d5 CM |
1075 | |
1076 | ret = btrfs_log_dentry_safe(trans, root, file->f_dentry); | |
49eb7e46 | 1077 | if (ret < 0) { |
e02119d5 | 1078 | goto out; |
49eb7e46 CM |
1079 | } |
1080 | ||
1081 | /* we've logged all the items and now have a consistent | |
1082 | * version of the file in the log. It is possible that | |
1083 | * someone will come in and modify the file, but that's | |
1084 | * fine because the log is consistent on disk, and we | |
1085 | * have references to all of the file's extents | |
1086 | * | |
1087 | * It is possible that someone will come in and log the | |
1088 | * file again, but that will end up using the synchronization | |
1089 | * inside btrfs_sync_log to keep things safe. | |
1090 | */ | |
1091 | mutex_unlock(&file->f_dentry->d_inode->i_mutex); | |
1092 | ||
e02119d5 CM |
1093 | if (ret > 0) { |
1094 | ret = btrfs_commit_transaction(trans, root); | |
1095 | } else { | |
1096 | btrfs_sync_log(trans, root); | |
1097 | ret = btrfs_end_transaction(trans, root); | |
1098 | } | |
49eb7e46 | 1099 | mutex_lock(&file->f_dentry->d_inode->i_mutex); |
39279cc3 CM |
1100 | out: |
1101 | return ret > 0 ? EIO : ret; | |
1102 | } | |
1103 | ||
9ebefb18 | 1104 | static struct vm_operations_struct btrfs_file_vm_ops = { |
92fee66d | 1105 | .fault = filemap_fault, |
9ebefb18 CM |
1106 | .page_mkwrite = btrfs_page_mkwrite, |
1107 | }; | |
1108 | ||
1109 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
1110 | { | |
1111 | vma->vm_ops = &btrfs_file_vm_ops; | |
1112 | file_accessed(filp); | |
1113 | return 0; | |
1114 | } | |
1115 | ||
39279cc3 CM |
1116 | struct file_operations btrfs_file_operations = { |
1117 | .llseek = generic_file_llseek, | |
1118 | .read = do_sync_read, | |
9ebefb18 | 1119 | .aio_read = generic_file_aio_read, |
e9906a98 | 1120 | .splice_read = generic_file_splice_read, |
39279cc3 | 1121 | .write = btrfs_file_write, |
9ebefb18 | 1122 | .mmap = btrfs_file_mmap, |
39279cc3 | 1123 | .open = generic_file_open, |
e1b81e67 | 1124 | .release = btrfs_release_file, |
39279cc3 | 1125 | .fsync = btrfs_sync_file, |
34287aa3 | 1126 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 1127 | #ifdef CONFIG_COMPAT |
34287aa3 | 1128 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
1129 | #endif |
1130 | }; |