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" | |
12fa8ec6 | 39 | #include "compat.h" |
39279cc3 CM |
40 | |
41 | ||
42 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, | |
43 | struct page **prepared_pages, | |
44 | const char __user * buf) | |
45 | { | |
46 | long page_fault = 0; | |
47 | int i; | |
48 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
49 | ||
50 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
51 | size_t count = min_t(size_t, | |
52 | PAGE_CACHE_SIZE - offset, write_bytes); | |
53 | struct page *page = prepared_pages[i]; | |
54 | fault_in_pages_readable(buf, count); | |
55 | ||
56 | /* Copy data from userspace to the current page */ | |
57 | kmap(page); | |
58 | page_fault = __copy_from_user(page_address(page) + offset, | |
59 | buf, count); | |
60 | /* Flush processor's dcache for this page */ | |
61 | flush_dcache_page(page); | |
62 | kunmap(page); | |
63 | buf += count; | |
64 | write_bytes -= count; | |
65 | ||
66 | if (page_fault) | |
67 | break; | |
68 | } | |
69 | return page_fault ? -EFAULT : 0; | |
70 | } | |
71 | ||
72 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
73 | { | |
74 | size_t i; | |
75 | for (i = 0; i < num_pages; i++) { | |
76 | if (!pages[i]) | |
77 | break; | |
78 | unlock_page(pages[i]); | |
79 | mark_page_accessed(pages[i]); | |
80 | page_cache_release(pages[i]); | |
81 | } | |
82 | } | |
83 | ||
98ed5174 | 84 | static int noinline insert_inline_extent(struct btrfs_trans_handle *trans, |
a52d9a80 | 85 | struct btrfs_root *root, struct inode *inode, |
3326d1b0 CM |
86 | u64 offset, size_t size, |
87 | struct page **pages, size_t page_offset, | |
88 | int num_pages) | |
54aa1f4d CM |
89 | { |
90 | struct btrfs_key key; | |
91 | struct btrfs_path *path; | |
5f39d397 CM |
92 | struct extent_buffer *leaf; |
93 | char *kaddr; | |
94 | unsigned long ptr; | |
54aa1f4d | 95 | struct btrfs_file_extent_item *ei; |
3326d1b0 | 96 | struct page *page; |
54aa1f4d CM |
97 | u32 datasize; |
98 | int err = 0; | |
99 | int ret; | |
3326d1b0 CM |
100 | int i; |
101 | ssize_t cur_size; | |
54aa1f4d CM |
102 | |
103 | path = btrfs_alloc_path(); | |
104 | if (!path) | |
105 | return -ENOMEM; | |
106 | ||
54aa1f4d CM |
107 | btrfs_set_trans_block_group(trans, inode); |
108 | ||
109 | key.objectid = inode->i_ino; | |
110 | key.offset = offset; | |
54aa1f4d | 111 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
54aa1f4d | 112 | |
3326d1b0 CM |
113 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
114 | if (ret < 0) { | |
54aa1f4d CM |
115 | err = ret; |
116 | goto fail; | |
117 | } | |
3326d1b0 | 118 | if (ret == 1) { |
179e29e4 CM |
119 | struct btrfs_key found_key; |
120 | ||
121 | if (path->slots[0] == 0) | |
122 | goto insert; | |
123 | ||
3326d1b0 CM |
124 | path->slots[0]--; |
125 | leaf = path->nodes[0]; | |
179e29e4 CM |
126 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
127 | ||
128 | if (found_key.objectid != inode->i_ino) | |
129 | goto insert; | |
130 | ||
131 | if (found_key.type != BTRFS_EXTENT_DATA_KEY) | |
132 | goto insert; | |
3326d1b0 CM |
133 | ei = btrfs_item_ptr(leaf, path->slots[0], |
134 | struct btrfs_file_extent_item); | |
135 | ||
136 | if (btrfs_file_extent_type(leaf, ei) != | |
137 | BTRFS_FILE_EXTENT_INLINE) { | |
138 | goto insert; | |
139 | } | |
140 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
141 | ret = 0; | |
142 | } | |
143 | if (ret == 0) { | |
144 | u32 found_size; | |
18f16f7b | 145 | u64 found_end; |
3326d1b0 CM |
146 | |
147 | leaf = path->nodes[0]; | |
148 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
149 | struct btrfs_file_extent_item); | |
150 | ||
151 | if (btrfs_file_extent_type(leaf, ei) != | |
152 | BTRFS_FILE_EXTENT_INLINE) { | |
153 | err = ret; | |
154 | btrfs_print_leaf(root, leaf); | |
155 | printk("found wasn't inline offset %Lu inode %lu\n", | |
156 | offset, inode->i_ino); | |
157 | goto fail; | |
158 | } | |
3326d1b0 CM |
159 | found_size = btrfs_file_extent_inline_len(leaf, |
160 | btrfs_item_nr(leaf, path->slots[0])); | |
18f16f7b | 161 | found_end = key.offset + found_size; |
3326d1b0 | 162 | |
18f16f7b | 163 | if (found_end < offset + size) { |
3326d1b0 CM |
164 | btrfs_release_path(root, path); |
165 | ret = btrfs_search_slot(trans, root, &key, path, | |
18f16f7b | 166 | offset + size - found_end, 1); |
3326d1b0 | 167 | BUG_ON(ret != 0); |
179e29e4 | 168 | |
3326d1b0 | 169 | ret = btrfs_extend_item(trans, root, path, |
18f16f7b | 170 | offset + size - found_end); |
3326d1b0 CM |
171 | if (ret) { |
172 | err = ret; | |
173 | goto fail; | |
174 | } | |
175 | leaf = path->nodes[0]; | |
176 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
177 | struct btrfs_file_extent_item); | |
9069218d | 178 | inode->i_blocks += (offset + size - found_end) >> 9; |
3326d1b0 | 179 | } |
18f16f7b Y |
180 | if (found_end < offset) { |
181 | ptr = btrfs_file_extent_inline_start(ei) + found_size; | |
182 | memset_extent_buffer(leaf, 0, ptr, offset - found_end); | |
183 | } | |
3326d1b0 CM |
184 | } else { |
185 | insert: | |
186 | btrfs_release_path(root, path); | |
18f16f7b | 187 | datasize = offset + size - key.offset; |
9069218d | 188 | inode->i_blocks += datasize >> 9; |
18f16f7b | 189 | datasize = btrfs_file_extent_calc_inline_size(datasize); |
3326d1b0 CM |
190 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
191 | datasize); | |
192 | if (ret) { | |
193 | err = ret; | |
194 | printk("got bad ret %d\n", ret); | |
195 | goto fail; | |
196 | } | |
197 | leaf = path->nodes[0]; | |
198 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
199 | struct btrfs_file_extent_item); | |
200 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
201 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
202 | } | |
18f16f7b | 203 | ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset; |
3326d1b0 CM |
204 | |
205 | cur_size = size; | |
206 | i = 0; | |
207 | while (size > 0) { | |
208 | page = pages[i]; | |
209 | kaddr = kmap_atomic(page, KM_USER0); | |
ae2f5411 | 210 | cur_size = min_t(size_t, PAGE_CACHE_SIZE - page_offset, size); |
3326d1b0 CM |
211 | write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size); |
212 | kunmap_atomic(kaddr, KM_USER0); | |
213 | page_offset = 0; | |
214 | ptr += cur_size; | |
215 | size -= cur_size; | |
216 | if (i >= num_pages) { | |
217 | printk("i %d num_pages %d\n", i, num_pages); | |
218 | } | |
219 | i++; | |
220 | } | |
5f39d397 | 221 | btrfs_mark_buffer_dirty(leaf); |
54aa1f4d CM |
222 | fail: |
223 | btrfs_free_path(path); | |
54aa1f4d CM |
224 | return err; |
225 | } | |
226 | ||
98ed5174 | 227 | static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans, |
39279cc3 CM |
228 | struct btrfs_root *root, |
229 | struct file *file, | |
230 | struct page **pages, | |
231 | size_t num_pages, | |
232 | loff_t pos, | |
233 | size_t write_bytes) | |
234 | { | |
39279cc3 | 235 | int err = 0; |
a52d9a80 | 236 | int i; |
6da6abae | 237 | struct inode *inode = fdentry(file)->d_inode; |
d1310b2e | 238 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
db94535d CM |
239 | u64 hint_byte; |
240 | u64 num_bytes; | |
a52d9a80 CM |
241 | u64 start_pos; |
242 | u64 end_of_last_block; | |
243 | u64 end_pos = pos + write_bytes; | |
dcfec0dc | 244 | u64 inline_size; |
a52d9a80 | 245 | loff_t isize = i_size_read(inode); |
39279cc3 | 246 | |
5f39d397 | 247 | start_pos = pos & ~((u64)root->sectorsize - 1); |
db94535d CM |
248 | num_bytes = (write_bytes + pos - start_pos + |
249 | root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
39279cc3 | 250 | |
db94535d CM |
251 | end_of_last_block = start_pos + num_bytes - 1; |
252 | ||
d1310b2e | 253 | lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
a52d9a80 CM |
254 | trans = btrfs_start_transaction(root, 1); |
255 | if (!trans) { | |
256 | err = -ENOMEM; | |
257 | goto out_unlock; | |
258 | } | |
259 | btrfs_set_trans_block_group(trans, inode); | |
db94535d | 260 | hint_byte = 0; |
a52d9a80 CM |
261 | |
262 | if ((end_of_last_block & 4095) == 0) { | |
9433063b | 263 | printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block); |
a52d9a80 | 264 | } |
d1310b2e | 265 | set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
a52d9a80 CM |
266 | |
267 | /* FIXME...EIEIO, ENOSPC and more */ | |
a52d9a80 | 268 | /* insert any holes we need to create */ |
1b1e2135 | 269 | if (isize < start_pos) { |
a52d9a80 CM |
270 | u64 last_pos_in_file; |
271 | u64 hole_size; | |
5f39d397 | 272 | u64 mask = root->sectorsize - 1; |
a52d9a80 | 273 | last_pos_in_file = (isize + mask) & ~mask; |
1b1e2135 | 274 | hole_size = (start_pos - last_pos_in_file + mask) & ~mask; |
e6dcd2dc CM |
275 | if (hole_size > 0) { |
276 | btrfs_wait_ordered_range(inode, last_pos_in_file, | |
277 | last_pos_in_file + hole_size); | |
2bf5a725 CM |
278 | err = btrfs_drop_extents(trans, root, inode, |
279 | last_pos_in_file, | |
280 | last_pos_in_file + hole_size, | |
3326d1b0 | 281 | last_pos_in_file, |
db94535d | 282 | &hint_byte); |
2bf5a725 CM |
283 | if (err) |
284 | goto failed; | |
285 | ||
a52d9a80 CM |
286 | err = btrfs_insert_file_extent(trans, root, |
287 | inode->i_ino, | |
288 | last_pos_in_file, | |
f2eb0a24 | 289 | 0, 0, hole_size, 0); |
d1310b2e CM |
290 | btrfs_drop_extent_cache(inode, last_pos_in_file, |
291 | last_pos_in_file + hole_size -1); | |
5f56406a | 292 | btrfs_check_file(root, inode); |
a52d9a80 CM |
293 | } |
294 | if (err) | |
39279cc3 | 295 | goto failed; |
a52d9a80 CM |
296 | } |
297 | ||
298 | /* | |
299 | * either allocate an extent for the new bytes or setup the key | |
300 | * to show we are doing inline data in the extent | |
301 | */ | |
3326d1b0 CM |
302 | inline_size = end_pos; |
303 | if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) || | |
6f568d35 CM |
304 | inline_size > root->fs_info->max_inline || |
305 | (inline_size & (root->sectorsize -1)) == 0 || | |
3326d1b0 | 306 | inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) { |
e6dcd2dc CM |
307 | /* check for reserved extents on each page, we don't want |
308 | * to reset the delalloc bit on things that already have | |
309 | * extents reserved. | |
310 | */ | |
311 | set_extent_delalloc(io_tree, start_pos, | |
312 | end_of_last_block, GFP_NOFS); | |
a52d9a80 CM |
313 | for (i = 0; i < num_pages; i++) { |
314 | struct page *p = pages[i]; | |
315 | SetPageUptodate(p); | |
b888db2b | 316 | set_page_dirty(p); |
39279cc3 | 317 | } |
a52d9a80 | 318 | } else { |
3326d1b0 | 319 | u64 aligned_end; |
b888db2b | 320 | /* step one, delete the existing extents in this range */ |
3326d1b0 CM |
321 | aligned_end = (pos + write_bytes + root->sectorsize - 1) & |
322 | ~((u64)root->sectorsize - 1); | |
2bf5a725 | 323 | err = btrfs_drop_extents(trans, root, inode, start_pos, |
179e29e4 | 324 | aligned_end, aligned_end, &hint_byte); |
2bf5a725 CM |
325 | if (err) |
326 | goto failed; | |
dcfec0dc Y |
327 | if (isize > inline_size) |
328 | inline_size = min_t(u64, isize, aligned_end); | |
329 | inline_size -= start_pos; | |
a52d9a80 | 330 | err = insert_inline_extent(trans, root, inode, start_pos, |
dcfec0dc | 331 | inline_size, pages, 0, num_pages); |
d1310b2e | 332 | btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1); |
a52d9a80 | 333 | BUG_ON(err); |
a52d9a80 CM |
334 | } |
335 | if (end_pos > isize) { | |
336 | i_size_write(inode, end_pos); | |
337 | btrfs_update_inode(trans, root, inode); | |
39279cc3 CM |
338 | } |
339 | failed: | |
a52d9a80 CM |
340 | err = btrfs_end_transaction(trans, root); |
341 | out_unlock: | |
d1310b2e | 342 | unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
39279cc3 CM |
343 | return err; |
344 | } | |
345 | ||
a52d9a80 CM |
346 | int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end) |
347 | { | |
348 | struct extent_map *em; | |
3b951516 CM |
349 | struct extent_map *split = NULL; |
350 | struct extent_map *split2 = NULL; | |
a52d9a80 | 351 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
e6dcd2dc | 352 | struct extent_map *tmp; |
39b5637f | 353 | u64 len = end - start + 1; |
e6dcd2dc | 354 | u64 next_start; |
3b951516 CM |
355 | int ret; |
356 | int testend = 1; | |
a52d9a80 | 357 | |
e6dcd2dc | 358 | WARN_ON(end < start); |
3b951516 | 359 | if (end == (u64)-1) { |
39b5637f | 360 | len = (u64)-1; |
3b951516 CM |
361 | testend = 0; |
362 | } | |
a52d9a80 | 363 | while(1) { |
3b951516 CM |
364 | if (!split) |
365 | split = alloc_extent_map(GFP_NOFS); | |
366 | if (!split2) | |
367 | split2 = alloc_extent_map(GFP_NOFS); | |
368 | ||
d1310b2e | 369 | spin_lock(&em_tree->lock); |
39b5637f | 370 | em = lookup_extent_mapping(em_tree, start, len); |
d1310b2e CM |
371 | if (!em) { |
372 | spin_unlock(&em_tree->lock); | |
a52d9a80 | 373 | break; |
d1310b2e | 374 | } |
e6dcd2dc CM |
375 | tmp = rb_entry(&em->rb_node, struct extent_map, rb_node); |
376 | next_start = tmp->start; | |
a52d9a80 | 377 | remove_extent_mapping(em_tree, em); |
3b951516 CM |
378 | |
379 | if (em->block_start < EXTENT_MAP_LAST_BYTE && | |
380 | em->start < start) { | |
381 | split->start = em->start; | |
382 | split->len = start - em->start; | |
383 | split->block_start = em->block_start; | |
384 | split->bdev = em->bdev; | |
385 | split->flags = em->flags; | |
386 | ret = add_extent_mapping(em_tree, split); | |
387 | BUG_ON(ret); | |
388 | free_extent_map(split); | |
389 | split = split2; | |
390 | split2 = NULL; | |
391 | } | |
392 | if (em->block_start < EXTENT_MAP_LAST_BYTE && | |
393 | testend && em->start + em->len > start + len) { | |
394 | u64 diff = start + len - em->start; | |
395 | ||
396 | split->start = start + len; | |
397 | split->len = em->start + em->len - (start + len); | |
398 | split->bdev = em->bdev; | |
399 | split->flags = em->flags; | |
400 | ||
401 | split->block_start = em->block_start + diff; | |
402 | ||
403 | ret = add_extent_mapping(em_tree, split); | |
404 | BUG_ON(ret); | |
405 | free_extent_map(split); | |
406 | split = NULL; | |
407 | } | |
d1310b2e CM |
408 | spin_unlock(&em_tree->lock); |
409 | ||
a52d9a80 CM |
410 | /* once for us */ |
411 | free_extent_map(em); | |
412 | /* once for the tree*/ | |
413 | free_extent_map(em); | |
414 | } | |
3b951516 CM |
415 | if (split) |
416 | free_extent_map(split); | |
417 | if (split2) | |
418 | free_extent_map(split2); | |
a52d9a80 CM |
419 | return 0; |
420 | } | |
421 | ||
5f56406a CM |
422 | int btrfs_check_file(struct btrfs_root *root, struct inode *inode) |
423 | { | |
424 | return 0; | |
425 | #if 0 | |
426 | struct btrfs_path *path; | |
427 | struct btrfs_key found_key; | |
428 | struct extent_buffer *leaf; | |
429 | struct btrfs_file_extent_item *extent; | |
430 | u64 last_offset = 0; | |
431 | int nritems; | |
432 | int slot; | |
433 | int found_type; | |
434 | int ret; | |
435 | int err = 0; | |
436 | u64 extent_end = 0; | |
437 | ||
438 | path = btrfs_alloc_path(); | |
439 | ret = btrfs_lookup_file_extent(NULL, root, path, inode->i_ino, | |
440 | last_offset, 0); | |
441 | while(1) { | |
442 | nritems = btrfs_header_nritems(path->nodes[0]); | |
443 | if (path->slots[0] >= nritems) { | |
444 | ret = btrfs_next_leaf(root, path); | |
445 | if (ret) | |
446 | goto out; | |
447 | nritems = btrfs_header_nritems(path->nodes[0]); | |
448 | } | |
449 | slot = path->slots[0]; | |
450 | leaf = path->nodes[0]; | |
451 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
452 | if (found_key.objectid != inode->i_ino) | |
453 | break; | |
454 | if (found_key.type != BTRFS_EXTENT_DATA_KEY) | |
455 | goto out; | |
456 | ||
9069218d | 457 | if (found_key.offset < last_offset) { |
5f56406a CM |
458 | WARN_ON(1); |
459 | btrfs_print_leaf(root, leaf); | |
460 | printk("inode %lu found offset %Lu expected %Lu\n", | |
461 | inode->i_ino, found_key.offset, last_offset); | |
462 | err = 1; | |
463 | goto out; | |
464 | } | |
465 | extent = btrfs_item_ptr(leaf, slot, | |
466 | struct btrfs_file_extent_item); | |
467 | found_type = btrfs_file_extent_type(leaf, extent); | |
468 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
469 | extent_end = found_key.offset + | |
470 | btrfs_file_extent_num_bytes(leaf, extent); | |
471 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
472 | struct btrfs_item *item; | |
473 | item = btrfs_item_nr(leaf, slot); | |
474 | extent_end = found_key.offset + | |
475 | btrfs_file_extent_inline_len(leaf, item); | |
476 | extent_end = (extent_end + root->sectorsize - 1) & | |
477 | ~((u64)root->sectorsize -1 ); | |
478 | } | |
479 | last_offset = extent_end; | |
480 | path->slots[0]++; | |
481 | } | |
9069218d | 482 | if (0 && last_offset < inode->i_size) { |
5f56406a CM |
483 | WARN_ON(1); |
484 | btrfs_print_leaf(root, leaf); | |
485 | printk("inode %lu found offset %Lu size %Lu\n", inode->i_ino, | |
486 | last_offset, inode->i_size); | |
487 | err = 1; | |
488 | ||
489 | } | |
490 | out: | |
491 | btrfs_free_path(path); | |
492 | return err; | |
493 | #endif | |
494 | } | |
495 | ||
39279cc3 CM |
496 | /* |
497 | * this is very complex, but the basic idea is to drop all extents | |
498 | * in the range start - end. hint_block is filled in with a block number | |
499 | * that would be a good hint to the block allocator for this file. | |
500 | * | |
501 | * If an extent intersects the range but is not entirely inside the range | |
502 | * it is either truncated or split. Anything entirely inside the range | |
503 | * is deleted from the tree. | |
504 | */ | |
505 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, | |
506 | struct btrfs_root *root, struct inode *inode, | |
00f5c795 | 507 | u64 start, u64 end, u64 inline_limit, u64 *hint_byte) |
39279cc3 | 508 | { |
00f5c795 CM |
509 | u64 extent_end = 0; |
510 | u64 search_start = start; | |
5f39d397 | 511 | struct extent_buffer *leaf; |
39279cc3 | 512 | struct btrfs_file_extent_item *extent; |
39279cc3 | 513 | struct btrfs_path *path; |
00f5c795 CM |
514 | struct btrfs_key key; |
515 | struct btrfs_file_extent_item old; | |
516 | int keep; | |
517 | int slot; | |
39279cc3 CM |
518 | int bookend; |
519 | int found_type; | |
520 | int found_extent; | |
521 | int found_inline; | |
ccd467d6 | 522 | int recow; |
00f5c795 | 523 | int ret; |
39279cc3 | 524 | |
a52d9a80 CM |
525 | btrfs_drop_extent_cache(inode, start, end - 1); |
526 | ||
39279cc3 CM |
527 | path = btrfs_alloc_path(); |
528 | if (!path) | |
529 | return -ENOMEM; | |
530 | while(1) { | |
ccd467d6 | 531 | recow = 0; |
39279cc3 CM |
532 | btrfs_release_path(root, path); |
533 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
534 | search_start, -1); | |
535 | if (ret < 0) | |
536 | goto out; | |
537 | if (ret > 0) { | |
538 | if (path->slots[0] == 0) { | |
539 | ret = 0; | |
540 | goto out; | |
541 | } | |
542 | path->slots[0]--; | |
543 | } | |
8c2383c3 | 544 | next_slot: |
39279cc3 CM |
545 | keep = 0; |
546 | bookend = 0; | |
547 | found_extent = 0; | |
548 | found_inline = 0; | |
549 | extent = NULL; | |
5f39d397 | 550 | leaf = path->nodes[0]; |
39279cc3 | 551 | slot = path->slots[0]; |
8c2383c3 | 552 | ret = 0; |
5f39d397 | 553 | btrfs_item_key_to_cpu(leaf, &key, slot); |
7261009c Y |
554 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY && |
555 | key.offset >= end) { | |
39279cc3 CM |
556 | goto out; |
557 | } | |
7261009c Y |
558 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
559 | key.objectid != inode->i_ino) { | |
39279cc3 CM |
560 | goto out; |
561 | } | |
ccd467d6 CM |
562 | if (recow) { |
563 | search_start = key.offset; | |
564 | continue; | |
565 | } | |
8c2383c3 CM |
566 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
567 | extent = btrfs_item_ptr(leaf, slot, | |
568 | struct btrfs_file_extent_item); | |
5f39d397 | 569 | found_type = btrfs_file_extent_type(leaf, extent); |
8c2383c3 | 570 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
257d0ce3 CM |
571 | extent_end = |
572 | btrfs_file_extent_disk_bytenr(leaf, | |
573 | extent); | |
574 | if (extent_end) | |
575 | *hint_byte = extent_end; | |
576 | ||
8c2383c3 | 577 | extent_end = key.offset + |
db94535d | 578 | btrfs_file_extent_num_bytes(leaf, extent); |
8c2383c3 CM |
579 | found_extent = 1; |
580 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 CM |
581 | struct btrfs_item *item; |
582 | item = btrfs_item_nr(leaf, slot); | |
8c2383c3 CM |
583 | found_inline = 1; |
584 | extent_end = key.offset + | |
5f39d397 | 585 | btrfs_file_extent_inline_len(leaf, item); |
8c2383c3 CM |
586 | } |
587 | } else { | |
588 | extent_end = search_start; | |
39279cc3 CM |
589 | } |
590 | ||
591 | /* we found nothing we can drop */ | |
8c2383c3 CM |
592 | if ((!found_extent && !found_inline) || |
593 | search_start >= extent_end) { | |
594 | int nextret; | |
595 | u32 nritems; | |
5f39d397 | 596 | nritems = btrfs_header_nritems(leaf); |
8c2383c3 CM |
597 | if (slot >= nritems - 1) { |
598 | nextret = btrfs_next_leaf(root, path); | |
599 | if (nextret) | |
600 | goto out; | |
ccd467d6 | 601 | recow = 1; |
8c2383c3 CM |
602 | } else { |
603 | path->slots[0]++; | |
604 | } | |
605 | goto next_slot; | |
39279cc3 CM |
606 | } |
607 | ||
39279cc3 | 608 | if (found_inline) { |
5f39d397 | 609 | u64 mask = root->sectorsize - 1; |
39279cc3 CM |
610 | search_start = (extent_end + mask) & ~mask; |
611 | } else | |
612 | search_start = extent_end; | |
6e3b9666 | 613 | if (end <= extent_end && start >= key.offset && found_inline) { |
179e29e4 | 614 | *hint_byte = EXTENT_MAP_INLINE; |
6e3b9666 | 615 | continue; |
179e29e4 | 616 | } |
39279cc3 CM |
617 | if (end < extent_end && end >= key.offset) { |
618 | if (found_extent) { | |
db94535d CM |
619 | u64 disk_bytenr = |
620 | btrfs_file_extent_disk_bytenr(leaf, extent); | |
621 | u64 disk_num_bytes = | |
622 | btrfs_file_extent_disk_num_bytes(leaf, | |
5f39d397 CM |
623 | extent); |
624 | read_extent_buffer(leaf, &old, | |
625 | (unsigned long)extent, | |
626 | sizeof(old)); | |
db94535d | 627 | if (disk_bytenr != 0) { |
39279cc3 | 628 | ret = btrfs_inc_extent_ref(trans, root, |
7bb86316 CM |
629 | disk_bytenr, disk_num_bytes, |
630 | root->root_key.objectid, | |
631 | trans->transid, | |
632 | key.objectid, end); | |
39279cc3 CM |
633 | BUG_ON(ret); |
634 | } | |
635 | } | |
179e29e4 | 636 | bookend = 1; |
0181e58f | 637 | if (found_inline && start <= key.offset) |
179e29e4 | 638 | keep = 1; |
39279cc3 | 639 | } |
39279cc3 CM |
640 | /* truncate existing extent */ |
641 | if (start > key.offset) { | |
642 | u64 new_num; | |
643 | u64 old_num; | |
644 | keep = 1; | |
5f39d397 | 645 | WARN_ON(start & (root->sectorsize - 1)); |
39279cc3 | 646 | if (found_extent) { |
db94535d CM |
647 | new_num = start - key.offset; |
648 | old_num = btrfs_file_extent_num_bytes(leaf, | |
649 | extent); | |
650 | *hint_byte = | |
651 | btrfs_file_extent_disk_bytenr(leaf, | |
652 | extent); | |
653 | if (btrfs_file_extent_disk_bytenr(leaf, | |
654 | extent)) { | |
9069218d | 655 | dec_i_blocks(inode, old_num - new_num); |
39279cc3 | 656 | } |
db94535d CM |
657 | btrfs_set_file_extent_num_bytes(leaf, extent, |
658 | new_num); | |
5f39d397 | 659 | btrfs_mark_buffer_dirty(leaf); |
00f5c795 CM |
660 | } else if (key.offset < inline_limit && |
661 | (end > extent_end) && | |
662 | (inline_limit < extent_end)) { | |
3326d1b0 CM |
663 | u32 new_size; |
664 | new_size = btrfs_file_extent_calc_inline_size( | |
00f5c795 | 665 | inline_limit - key.offset); |
9069218d CM |
666 | dec_i_blocks(inode, (extent_end - key.offset) - |
667 | (inline_limit - key.offset)); | |
3326d1b0 | 668 | btrfs_truncate_item(trans, root, path, |
179e29e4 | 669 | new_size, 1); |
39279cc3 CM |
670 | } |
671 | } | |
672 | /* delete the entire extent */ | |
673 | if (!keep) { | |
db94535d CM |
674 | u64 disk_bytenr = 0; |
675 | u64 disk_num_bytes = 0; | |
676 | u64 extent_num_bytes = 0; | |
7bb86316 | 677 | u64 root_gen; |
d8d5f3e1 | 678 | u64 root_owner; |
7bb86316 | 679 | |
d8d5f3e1 CM |
680 | root_gen = btrfs_header_generation(leaf); |
681 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 682 | if (found_extent) { |
db94535d CM |
683 | disk_bytenr = |
684 | btrfs_file_extent_disk_bytenr(leaf, | |
5f39d397 | 685 | extent); |
db94535d CM |
686 | disk_num_bytes = |
687 | btrfs_file_extent_disk_num_bytes(leaf, | |
5f39d397 | 688 | extent); |
db94535d CM |
689 | extent_num_bytes = |
690 | btrfs_file_extent_num_bytes(leaf, extent); | |
691 | *hint_byte = | |
692 | btrfs_file_extent_disk_bytenr(leaf, | |
693 | extent); | |
39279cc3 CM |
694 | } |
695 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d | 696 | /* TODO update progress marker and return */ |
39279cc3 CM |
697 | BUG_ON(ret); |
698 | btrfs_release_path(root, path); | |
699 | extent = NULL; | |
db94535d | 700 | if (found_extent && disk_bytenr != 0) { |
9069218d | 701 | dec_i_blocks(inode, extent_num_bytes); |
39279cc3 | 702 | ret = btrfs_free_extent(trans, root, |
7bb86316 CM |
703 | disk_bytenr, |
704 | disk_num_bytes, | |
d8d5f3e1 | 705 | root_owner, |
7bb86316 CM |
706 | root_gen, inode->i_ino, |
707 | key.offset, 0); | |
39279cc3 CM |
708 | } |
709 | ||
710 | BUG_ON(ret); | |
711 | if (!bookend && search_start >= end) { | |
712 | ret = 0; | |
713 | goto out; | |
714 | } | |
715 | if (!bookend) | |
716 | continue; | |
717 | } | |
0181e58f | 718 | if (bookend && found_inline && start <= key.offset) { |
179e29e4 CM |
719 | u32 new_size; |
720 | new_size = btrfs_file_extent_calc_inline_size( | |
0181e58f | 721 | extent_end - end); |
9069218d CM |
722 | dec_i_blocks(inode, (extent_end - key.offset) - |
723 | (extent_end - end)); | |
179e29e4 CM |
724 | btrfs_truncate_item(trans, root, path, new_size, 0); |
725 | } | |
39279cc3 CM |
726 | /* create bookend, splitting the extent in two */ |
727 | if (bookend && found_extent) { | |
728 | struct btrfs_key ins; | |
729 | ins.objectid = inode->i_ino; | |
730 | ins.offset = end; | |
39279cc3 | 731 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); |
39279cc3 CM |
732 | btrfs_release_path(root, path); |
733 | ret = btrfs_insert_empty_item(trans, root, path, &ins, | |
734 | sizeof(*extent)); | |
8c2383c3 | 735 | |
5f39d397 | 736 | leaf = path->nodes[0]; |
8c2383c3 | 737 | if (ret) { |
5f39d397 CM |
738 | btrfs_print_leaf(root, leaf); |
739 | printk("got %d on inserting %Lu %u %Lu start %Lu end %Lu found %Lu %Lu keep was %d\n", ret , ins.objectid, ins.type, ins.offset, start, end, key.offset, extent_end, keep); | |
8c2383c3 | 740 | } |
39279cc3 | 741 | BUG_ON(ret); |
5f39d397 CM |
742 | extent = btrfs_item_ptr(leaf, path->slots[0], |
743 | struct btrfs_file_extent_item); | |
744 | write_extent_buffer(leaf, &old, | |
745 | (unsigned long)extent, sizeof(old)); | |
746 | ||
747 | btrfs_set_file_extent_offset(leaf, extent, | |
db94535d CM |
748 | le64_to_cpu(old.offset) + end - key.offset); |
749 | WARN_ON(le64_to_cpu(old.num_bytes) < | |
750 | (extent_end - end)); | |
751 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
752 | extent_end - end); | |
5f39d397 | 753 | btrfs_set_file_extent_type(leaf, extent, |
39279cc3 | 754 | BTRFS_FILE_EXTENT_REG); |
db94535d | 755 | |
39279cc3 | 756 | btrfs_mark_buffer_dirty(path->nodes[0]); |
db94535d | 757 | if (le64_to_cpu(old.disk_bytenr) != 0) { |
39279cc3 | 758 | inode->i_blocks += |
db94535d CM |
759 | btrfs_file_extent_num_bytes(leaf, |
760 | extent) >> 9; | |
39279cc3 CM |
761 | } |
762 | ret = 0; | |
763 | goto out; | |
764 | } | |
765 | } | |
766 | out: | |
767 | btrfs_free_path(path); | |
9069218d | 768 | btrfs_check_file(root, inode); |
39279cc3 CM |
769 | return ret; |
770 | } | |
771 | ||
772 | /* | |
773 | * this gets pages into the page cache and locks them down | |
774 | */ | |
98ed5174 CM |
775 | static int prepare_pages(struct btrfs_root *root, struct file *file, |
776 | struct page **pages, size_t num_pages, | |
777 | loff_t pos, unsigned long first_index, | |
778 | unsigned long last_index, size_t write_bytes) | |
39279cc3 CM |
779 | { |
780 | int i; | |
781 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
6da6abae | 782 | struct inode *inode = fdentry(file)->d_inode; |
39279cc3 | 783 | int err = 0; |
8c2383c3 | 784 | u64 start_pos; |
e6dcd2dc | 785 | u64 last_pos; |
8c2383c3 | 786 | |
5f39d397 | 787 | start_pos = pos & ~((u64)root->sectorsize - 1); |
e6dcd2dc | 788 | last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT; |
39279cc3 CM |
789 | |
790 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
e6dcd2dc | 791 | again: |
39279cc3 CM |
792 | for (i = 0; i < num_pages; i++) { |
793 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
794 | if (!pages[i]) { | |
795 | err = -ENOMEM; | |
a52d9a80 | 796 | BUG_ON(1); |
39279cc3 | 797 | } |
ccd467d6 | 798 | wait_on_page_writeback(pages[i]); |
39279cc3 | 799 | } |
0762704b | 800 | if (start_pos < inode->i_size) { |
e6dcd2dc | 801 | struct btrfs_ordered_extent *ordered; |
d99cb30a CM |
802 | lock_extent(&BTRFS_I(inode)->io_tree, |
803 | start_pos, last_pos - 1, GFP_NOFS); | |
e6dcd2dc CM |
804 | ordered = btrfs_lookup_first_ordered_extent(inode, last_pos -1); |
805 | if (ordered && | |
806 | ordered->file_offset + ordered->len > start_pos && | |
807 | ordered->file_offset < last_pos) { | |
808 | btrfs_put_ordered_extent(ordered); | |
809 | unlock_extent(&BTRFS_I(inode)->io_tree, | |
810 | start_pos, last_pos - 1, GFP_NOFS); | |
811 | for (i = 0; i < num_pages; i++) { | |
812 | unlock_page(pages[i]); | |
813 | page_cache_release(pages[i]); | |
814 | } | |
815 | btrfs_wait_ordered_range(inode, start_pos, | |
816 | last_pos - start_pos); | |
817 | goto again; | |
818 | } | |
819 | if (ordered) | |
820 | btrfs_put_ordered_extent(ordered); | |
821 | ||
0762704b CM |
822 | clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos, |
823 | last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC, | |
824 | GFP_NOFS); | |
d99cb30a CM |
825 | unlock_extent(&BTRFS_I(inode)->io_tree, |
826 | start_pos, last_pos - 1, GFP_NOFS); | |
0762704b | 827 | } |
e6dcd2dc CM |
828 | for (i = 0; i < num_pages; i++) { |
829 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) | |
830 | ClearPageDirty(pages[i]); | |
831 | #else | |
832 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); | |
833 | #endif | |
834 | set_page_extent_mapped(pages[i]); | |
835 | WARN_ON(!PageLocked(pages[i])); | |
836 | } | |
39279cc3 | 837 | return 0; |
39279cc3 CM |
838 | } |
839 | ||
840 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
841 | size_t count, loff_t *ppos) | |
842 | { | |
843 | loff_t pos; | |
2ff3e9b6 CM |
844 | loff_t start_pos; |
845 | ssize_t num_written = 0; | |
846 | ssize_t err = 0; | |
39279cc3 | 847 | int ret = 0; |
6da6abae | 848 | struct inode *inode = fdentry(file)->d_inode; |
39279cc3 | 849 | struct btrfs_root *root = BTRFS_I(inode)->root; |
8c2383c3 CM |
850 | struct page **pages = NULL; |
851 | int nrptrs; | |
39279cc3 CM |
852 | struct page *pinned[2]; |
853 | unsigned long first_index; | |
854 | unsigned long last_index; | |
8c2383c3 CM |
855 | |
856 | nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE, | |
857 | PAGE_CACHE_SIZE / (sizeof(struct page *))); | |
39279cc3 CM |
858 | pinned[0] = NULL; |
859 | pinned[1] = NULL; | |
2ff3e9b6 | 860 | |
39279cc3 | 861 | pos = *ppos; |
2ff3e9b6 CM |
862 | start_pos = pos; |
863 | ||
39279cc3 CM |
864 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
865 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
866 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
867 | if (err) | |
1832a6d5 | 868 | goto out_nolock; |
39279cc3 | 869 | if (count == 0) |
1832a6d5 | 870 | goto out_nolock; |
12fa8ec6 JM |
871 | #ifdef REMOVE_SUID_PATH |
872 | err = remove_suid(&file->f_path); | |
873 | #else | |
6da6abae | 874 | err = remove_suid(fdentry(file)); |
12fa8ec6 | 875 | #endif |
39279cc3 | 876 | if (err) |
1832a6d5 | 877 | goto out_nolock; |
39279cc3 CM |
878 | file_update_time(file); |
879 | ||
8c2383c3 | 880 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
39279cc3 CM |
881 | |
882 | mutex_lock(&inode->i_mutex); | |
883 | first_index = pos >> PAGE_CACHE_SHIFT; | |
884 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
885 | ||
409c6118 CM |
886 | /* |
887 | * if this is a nodatasum mount, force summing off for the inode | |
888 | * all the time. That way a later mount with summing on won't | |
889 | * get confused | |
890 | */ | |
891 | if (btrfs_test_opt(root, NODATASUM)) | |
892 | btrfs_set_flag(inode, NODATASUM); | |
893 | ||
39279cc3 CM |
894 | /* |
895 | * there are lots of better ways to do this, but this code | |
896 | * makes sure the first and last page in the file range are | |
897 | * up to date and ready for cow | |
898 | */ | |
899 | if ((pos & (PAGE_CACHE_SIZE - 1))) { | |
900 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
901 | if (!PageUptodate(pinned[0])) { | |
9ebefb18 | 902 | ret = btrfs_readpage(NULL, pinned[0]); |
39279cc3 CM |
903 | BUG_ON(ret); |
904 | wait_on_page_locked(pinned[0]); | |
905 | } else { | |
906 | unlock_page(pinned[0]); | |
907 | } | |
908 | } | |
909 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { | |
910 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
911 | if (!PageUptodate(pinned[1])) { | |
9ebefb18 | 912 | ret = btrfs_readpage(NULL, pinned[1]); |
39279cc3 CM |
913 | BUG_ON(ret); |
914 | wait_on_page_locked(pinned[1]); | |
915 | } else { | |
916 | unlock_page(pinned[1]); | |
917 | } | |
918 | } | |
919 | ||
39279cc3 CM |
920 | while(count > 0) { |
921 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
11bd143f CM |
922 | size_t write_bytes = min(count, nrptrs * |
923 | (size_t)PAGE_CACHE_SIZE - | |
8c2383c3 | 924 | offset); |
39279cc3 CM |
925 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> |
926 | PAGE_CACHE_SHIFT; | |
927 | ||
8c2383c3 | 928 | WARN_ON(num_pages > nrptrs); |
39279cc3 | 929 | memset(pages, 0, sizeof(pages)); |
1832a6d5 | 930 | |
1832a6d5 | 931 | ret = btrfs_check_free_space(root, write_bytes, 0); |
1832a6d5 CM |
932 | if (ret) |
933 | goto out; | |
934 | ||
39279cc3 CM |
935 | ret = prepare_pages(root, file, pages, num_pages, |
936 | pos, first_index, last_index, | |
8c2383c3 | 937 | write_bytes); |
54aa1f4d CM |
938 | if (ret) |
939 | goto out; | |
39279cc3 | 940 | |
39279cc3 CM |
941 | ret = btrfs_copy_from_user(pos, num_pages, |
942 | write_bytes, pages, buf); | |
54aa1f4d CM |
943 | if (ret) { |
944 | btrfs_drop_pages(pages, num_pages); | |
945 | goto out; | |
946 | } | |
39279cc3 CM |
947 | |
948 | ret = dirty_and_release_pages(NULL, root, file, pages, | |
949 | num_pages, pos, write_bytes); | |
39279cc3 | 950 | btrfs_drop_pages(pages, num_pages); |
54aa1f4d CM |
951 | if (ret) |
952 | goto out; | |
39279cc3 CM |
953 | |
954 | buf += write_bytes; | |
955 | count -= write_bytes; | |
956 | pos += write_bytes; | |
957 | num_written += write_bytes; | |
958 | ||
8c2383c3 | 959 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages); |
448d640b CM |
960 | if (num_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
961 | btrfs_btree_balance_dirty(root, 1); | |
39279cc3 CM |
962 | cond_resched(); |
963 | } | |
39279cc3 | 964 | out: |
1832a6d5 | 965 | mutex_unlock(&inode->i_mutex); |
5b92ee72 | 966 | |
1832a6d5 | 967 | out_nolock: |
8c2383c3 | 968 | kfree(pages); |
39279cc3 CM |
969 | if (pinned[0]) |
970 | page_cache_release(pinned[0]); | |
971 | if (pinned[1]) | |
972 | page_cache_release(pinned[1]); | |
973 | *ppos = pos; | |
2ff3e9b6 CM |
974 | |
975 | if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) { | |
976 | err = sync_page_range(inode, inode->i_mapping, | |
977 | start_pos, num_written); | |
978 | if (err < 0) | |
979 | num_written = err; | |
16432985 | 980 | } else if (num_written > 0 && (file->f_flags & O_DIRECT)) { |
bb8885cc | 981 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22) |
b248a415 CM |
982 | do_sync_file_range(file, start_pos, |
983 | start_pos + num_written - 1, | |
984 | SYNC_FILE_RANGE_WRITE | | |
985 | SYNC_FILE_RANGE_WAIT_AFTER); | |
986 | #else | |
16432985 CM |
987 | do_sync_mapping_range(inode->i_mapping, start_pos, |
988 | start_pos + num_written - 1, | |
989 | SYNC_FILE_RANGE_WRITE | | |
990 | SYNC_FILE_RANGE_WAIT_AFTER); | |
b248a415 | 991 | #endif |
16432985 CM |
992 | invalidate_mapping_pages(inode->i_mapping, |
993 | start_pos >> PAGE_CACHE_SHIFT, | |
994 | (start_pos + num_written - 1) >> PAGE_CACHE_SHIFT); | |
2ff3e9b6 | 995 | } |
39279cc3 | 996 | current->backing_dev_info = NULL; |
39279cc3 CM |
997 | return num_written ? num_written : err; |
998 | } | |
999 | ||
6bf13c0c | 1000 | int btrfs_release_file(struct inode * inode, struct file * filp) |
e1b81e67 | 1001 | { |
6bf13c0c SW |
1002 | if (filp->private_data) |
1003 | btrfs_ioctl_trans_end(filp); | |
e1b81e67 M |
1004 | return 0; |
1005 | } | |
1006 | ||
39279cc3 CM |
1007 | static int btrfs_sync_file(struct file *file, |
1008 | struct dentry *dentry, int datasync) | |
1009 | { | |
1010 | struct inode *inode = dentry->d_inode; | |
1011 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
15ee9bc7 | 1012 | int ret = 0; |
39279cc3 CM |
1013 | struct btrfs_trans_handle *trans; |
1014 | ||
1015 | /* | |
15ee9bc7 JB |
1016 | * check the transaction that last modified this inode |
1017 | * and see if its already been committed | |
39279cc3 | 1018 | */ |
15ee9bc7 JB |
1019 | if (!BTRFS_I(inode)->last_trans) |
1020 | goto out; | |
a2135011 | 1021 | |
15ee9bc7 JB |
1022 | mutex_lock(&root->fs_info->trans_mutex); |
1023 | if (BTRFS_I(inode)->last_trans <= | |
1024 | root->fs_info->last_trans_committed) { | |
1025 | BTRFS_I(inode)->last_trans = 0; | |
1026 | mutex_unlock(&root->fs_info->trans_mutex); | |
1027 | goto out; | |
1028 | } | |
1029 | mutex_unlock(&root->fs_info->trans_mutex); | |
1030 | ||
1031 | /* | |
a52d9a80 CM |
1032 | * ok we haven't committed the transaction yet, lets do a commit |
1033 | */ | |
6bf13c0c SW |
1034 | if (file->private_data) |
1035 | btrfs_ioctl_trans_end(file); | |
1036 | ||
39279cc3 CM |
1037 | trans = btrfs_start_transaction(root, 1); |
1038 | if (!trans) { | |
1039 | ret = -ENOMEM; | |
1040 | goto out; | |
1041 | } | |
1042 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
1043 | out: |
1044 | return ret > 0 ? EIO : ret; | |
1045 | } | |
1046 | ||
9ebefb18 | 1047 | static struct vm_operations_struct btrfs_file_vm_ops = { |
92fee66d CM |
1048 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) |
1049 | .nopage = filemap_nopage, | |
1050 | .populate = filemap_populate, | |
1051 | #else | |
1052 | .fault = filemap_fault, | |
1053 | #endif | |
9ebefb18 CM |
1054 | .page_mkwrite = btrfs_page_mkwrite, |
1055 | }; | |
1056 | ||
1057 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
1058 | { | |
1059 | vma->vm_ops = &btrfs_file_vm_ops; | |
1060 | file_accessed(filp); | |
1061 | return 0; | |
1062 | } | |
1063 | ||
39279cc3 CM |
1064 | struct file_operations btrfs_file_operations = { |
1065 | .llseek = generic_file_llseek, | |
1066 | .read = do_sync_read, | |
9ebefb18 | 1067 | .aio_read = generic_file_aio_read, |
e9906a98 | 1068 | .splice_read = generic_file_splice_read, |
6da6abae CM |
1069 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1070 | .sendfile = generic_file_sendfile, | |
1071 | #endif | |
39279cc3 | 1072 | .write = btrfs_file_write, |
9ebefb18 | 1073 | .mmap = btrfs_file_mmap, |
39279cc3 | 1074 | .open = generic_file_open, |
e1b81e67 | 1075 | .release = btrfs_release_file, |
39279cc3 | 1076 | .fsync = btrfs_sync_file, |
34287aa3 | 1077 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 1078 | #ifdef CONFIG_COMPAT |
34287aa3 | 1079 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
1080 | #endif |
1081 | }; | |
1082 |