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" | |
39 | ||
40 | ||
41 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, | |
42 | struct page **prepared_pages, | |
43 | const char __user * buf) | |
44 | { | |
45 | long page_fault = 0; | |
46 | int i; | |
47 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
48 | ||
49 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
50 | size_t count = min_t(size_t, | |
51 | PAGE_CACHE_SIZE - offset, write_bytes); | |
52 | struct page *page = prepared_pages[i]; | |
53 | fault_in_pages_readable(buf, count); | |
54 | ||
55 | /* Copy data from userspace to the current page */ | |
56 | kmap(page); | |
57 | page_fault = __copy_from_user(page_address(page) + offset, | |
58 | buf, count); | |
59 | /* Flush processor's dcache for this page */ | |
60 | flush_dcache_page(page); | |
61 | kunmap(page); | |
62 | buf += count; | |
63 | write_bytes -= count; | |
64 | ||
65 | if (page_fault) | |
66 | break; | |
67 | } | |
68 | return page_fault ? -EFAULT : 0; | |
69 | } | |
70 | ||
71 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
72 | { | |
73 | size_t i; | |
74 | for (i = 0; i < num_pages; i++) { | |
75 | if (!pages[i]) | |
76 | break; | |
77 | unlock_page(pages[i]); | |
78 | mark_page_accessed(pages[i]); | |
79 | page_cache_release(pages[i]); | |
80 | } | |
81 | } | |
82 | ||
a52d9a80 CM |
83 | static int insert_inline_extent(struct btrfs_trans_handle *trans, |
84 | struct btrfs_root *root, struct inode *inode, | |
3326d1b0 CM |
85 | u64 offset, size_t size, |
86 | struct page **pages, size_t page_offset, | |
87 | int num_pages) | |
54aa1f4d CM |
88 | { |
89 | struct btrfs_key key; | |
90 | struct btrfs_path *path; | |
5f39d397 CM |
91 | struct extent_buffer *leaf; |
92 | char *kaddr; | |
93 | unsigned long ptr; | |
54aa1f4d | 94 | struct btrfs_file_extent_item *ei; |
3326d1b0 | 95 | struct page *page; |
54aa1f4d CM |
96 | u32 datasize; |
97 | int err = 0; | |
98 | int ret; | |
3326d1b0 CM |
99 | int i; |
100 | ssize_t cur_size; | |
54aa1f4d CM |
101 | |
102 | path = btrfs_alloc_path(); | |
103 | if (!path) | |
104 | return -ENOMEM; | |
105 | ||
54aa1f4d CM |
106 | btrfs_set_trans_block_group(trans, inode); |
107 | ||
108 | key.objectid = inode->i_ino; | |
109 | key.offset = offset; | |
54aa1f4d | 110 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
54aa1f4d | 111 | |
3326d1b0 CM |
112 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
113 | if (ret < 0) { | |
54aa1f4d CM |
114 | err = ret; |
115 | goto fail; | |
116 | } | |
3326d1b0 CM |
117 | if (ret == 1) { |
118 | path->slots[0]--; | |
119 | leaf = path->nodes[0]; | |
120 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
121 | struct btrfs_file_extent_item); | |
122 | ||
123 | if (btrfs_file_extent_type(leaf, ei) != | |
124 | BTRFS_FILE_EXTENT_INLINE) { | |
125 | goto insert; | |
126 | } | |
127 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
128 | ret = 0; | |
129 | } | |
130 | if (ret == 0) { | |
131 | u32 found_size; | |
18f16f7b | 132 | u64 found_end; |
3326d1b0 CM |
133 | |
134 | leaf = path->nodes[0]; | |
135 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
136 | struct btrfs_file_extent_item); | |
137 | ||
138 | if (btrfs_file_extent_type(leaf, ei) != | |
139 | BTRFS_FILE_EXTENT_INLINE) { | |
140 | err = ret; | |
141 | btrfs_print_leaf(root, leaf); | |
142 | printk("found wasn't inline offset %Lu inode %lu\n", | |
143 | offset, inode->i_ino); | |
144 | goto fail; | |
145 | } | |
3326d1b0 CM |
146 | found_size = btrfs_file_extent_inline_len(leaf, |
147 | btrfs_item_nr(leaf, path->slots[0])); | |
18f16f7b | 148 | found_end = key.offset + found_size; |
3326d1b0 | 149 | |
18f16f7b | 150 | if (found_end < offset + size) { |
3326d1b0 CM |
151 | btrfs_release_path(root, path); |
152 | ret = btrfs_search_slot(trans, root, &key, path, | |
18f16f7b | 153 | offset + size - found_end, 1); |
3326d1b0 CM |
154 | BUG_ON(ret != 0); |
155 | ret = btrfs_extend_item(trans, root, path, | |
18f16f7b | 156 | offset + size - found_end); |
3326d1b0 CM |
157 | if (ret) { |
158 | err = ret; | |
159 | goto fail; | |
160 | } | |
161 | leaf = path->nodes[0]; | |
162 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
163 | struct btrfs_file_extent_item); | |
164 | } | |
18f16f7b Y |
165 | if (found_end < offset) { |
166 | ptr = btrfs_file_extent_inline_start(ei) + found_size; | |
167 | memset_extent_buffer(leaf, 0, ptr, offset - found_end); | |
168 | } | |
3326d1b0 CM |
169 | } else { |
170 | insert: | |
171 | btrfs_release_path(root, path); | |
18f16f7b Y |
172 | datasize = offset + size - key.offset; |
173 | datasize = btrfs_file_extent_calc_inline_size(datasize); | |
3326d1b0 CM |
174 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
175 | datasize); | |
176 | if (ret) { | |
177 | err = ret; | |
178 | printk("got bad ret %d\n", ret); | |
179 | goto fail; | |
180 | } | |
181 | leaf = path->nodes[0]; | |
182 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
183 | struct btrfs_file_extent_item); | |
184 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
185 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
186 | } | |
18f16f7b | 187 | ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset; |
3326d1b0 CM |
188 | |
189 | cur_size = size; | |
190 | i = 0; | |
191 | while (size > 0) { | |
192 | page = pages[i]; | |
193 | kaddr = kmap_atomic(page, KM_USER0); | |
ae2f5411 | 194 | cur_size = min_t(size_t, PAGE_CACHE_SIZE - page_offset, size); |
3326d1b0 CM |
195 | write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size); |
196 | kunmap_atomic(kaddr, KM_USER0); | |
197 | page_offset = 0; | |
198 | ptr += cur_size; | |
199 | size -= cur_size; | |
200 | if (i >= num_pages) { | |
201 | printk("i %d num_pages %d\n", i, num_pages); | |
202 | } | |
203 | i++; | |
204 | } | |
5f39d397 | 205 | btrfs_mark_buffer_dirty(leaf); |
54aa1f4d CM |
206 | fail: |
207 | btrfs_free_path(path); | |
54aa1f4d CM |
208 | return err; |
209 | } | |
210 | ||
39279cc3 CM |
211 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, |
212 | struct btrfs_root *root, | |
213 | struct file *file, | |
214 | struct page **pages, | |
215 | size_t num_pages, | |
216 | loff_t pos, | |
217 | size_t write_bytes) | |
218 | { | |
39279cc3 | 219 | int err = 0; |
a52d9a80 | 220 | int i; |
39279cc3 | 221 | struct inode *inode = file->f_path.dentry->d_inode; |
a52d9a80 CM |
222 | struct extent_map *em; |
223 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
db94535d CM |
224 | u64 hint_byte; |
225 | u64 num_bytes; | |
a52d9a80 CM |
226 | u64 start_pos; |
227 | u64 end_of_last_block; | |
228 | u64 end_pos = pos + write_bytes; | |
db94535d | 229 | u32 inline_size; |
a52d9a80 | 230 | loff_t isize = i_size_read(inode); |
39279cc3 | 231 | |
a52d9a80 CM |
232 | em = alloc_extent_map(GFP_NOFS); |
233 | if (!em) | |
234 | return -ENOMEM; | |
39279cc3 | 235 | |
a52d9a80 | 236 | em->bdev = inode->i_sb->s_bdev; |
39279cc3 | 237 | |
5f39d397 | 238 | start_pos = pos & ~((u64)root->sectorsize - 1); |
db94535d CM |
239 | num_bytes = (write_bytes + pos - start_pos + |
240 | root->sectorsize - 1) & ~((u64)root->sectorsize - 1); | |
39279cc3 | 241 | |
011410bd | 242 | down_read(&BTRFS_I(inode)->root->snap_sem); |
db94535d CM |
243 | end_of_last_block = start_pos + num_bytes - 1; |
244 | ||
b888db2b | 245 | lock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS); |
a52d9a80 CM |
246 | mutex_lock(&root->fs_info->fs_mutex); |
247 | trans = btrfs_start_transaction(root, 1); | |
248 | if (!trans) { | |
249 | err = -ENOMEM; | |
250 | goto out_unlock; | |
251 | } | |
252 | btrfs_set_trans_block_group(trans, inode); | |
db94535d CM |
253 | inode->i_blocks += num_bytes >> 9; |
254 | hint_byte = 0; | |
a52d9a80 CM |
255 | |
256 | if ((end_of_last_block & 4095) == 0) { | |
9433063b | 257 | printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block); |
a52d9a80 CM |
258 | } |
259 | set_extent_uptodate(em_tree, start_pos, end_of_last_block, GFP_NOFS); | |
260 | ||
261 | /* FIXME...EIEIO, ENOSPC and more */ | |
262 | ||
a52d9a80 CM |
263 | /* insert any holes we need to create */ |
264 | if (inode->i_size < start_pos) { | |
265 | u64 last_pos_in_file; | |
266 | u64 hole_size; | |
5f39d397 | 267 | u64 mask = root->sectorsize - 1; |
a52d9a80 CM |
268 | last_pos_in_file = (isize + mask) & ~mask; |
269 | hole_size = (start_pos - last_pos_in_file + mask) & ~mask; | |
2bf5a725 | 270 | |
a52d9a80 | 271 | if (last_pos_in_file < start_pos) { |
2bf5a725 CM |
272 | err = btrfs_drop_extents(trans, root, inode, |
273 | last_pos_in_file, | |
274 | last_pos_in_file + hole_size, | |
3326d1b0 | 275 | last_pos_in_file, |
db94535d | 276 | &hint_byte); |
2bf5a725 CM |
277 | if (err) |
278 | goto failed; | |
279 | ||
a52d9a80 CM |
280 | err = btrfs_insert_file_extent(trans, root, |
281 | inode->i_ino, | |
282 | last_pos_in_file, | |
283 | 0, 0, hole_size); | |
284 | } | |
285 | if (err) | |
39279cc3 | 286 | goto failed; |
a52d9a80 CM |
287 | } |
288 | ||
289 | /* | |
290 | * either allocate an extent for the new bytes or setup the key | |
291 | * to show we are doing inline data in the extent | |
292 | */ | |
3326d1b0 CM |
293 | inline_size = end_pos; |
294 | if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) || | |
7936ca38 | 295 | inline_size > 8192 || |
3326d1b0 | 296 | inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) { |
b888db2b | 297 | u64 last_end; |
3326d1b0 | 298 | |
a52d9a80 CM |
299 | for (i = 0; i < num_pages; i++) { |
300 | struct page *p = pages[i]; | |
301 | SetPageUptodate(p); | |
b888db2b | 302 | set_page_dirty(p); |
39279cc3 | 303 | } |
35ebb934 CM |
304 | last_end = (u64)(pages[num_pages -1]->index) << |
305 | PAGE_CACHE_SHIFT; | |
b888db2b CM |
306 | last_end += PAGE_CACHE_SIZE - 1; |
307 | set_extent_delalloc(em_tree, start_pos, end_of_last_block, | |
308 | GFP_NOFS); | |
a52d9a80 | 309 | } else { |
3326d1b0 | 310 | u64 aligned_end; |
b888db2b | 311 | /* step one, delete the existing extents in this range */ |
3326d1b0 CM |
312 | aligned_end = (pos + write_bytes + root->sectorsize - 1) & |
313 | ~((u64)root->sectorsize - 1); | |
2bf5a725 | 314 | err = btrfs_drop_extents(trans, root, inode, start_pos, |
3326d1b0 | 315 | aligned_end, end_pos, &hint_byte); |
2bf5a725 CM |
316 | if (err) |
317 | goto failed; | |
a52d9a80 | 318 | err = insert_inline_extent(trans, root, inode, start_pos, |
3326d1b0 CM |
319 | end_pos - start_pos, pages, 0, |
320 | num_pages); | |
a52d9a80 | 321 | BUG_ON(err); |
a52d9a80 CM |
322 | } |
323 | if (end_pos > isize) { | |
324 | i_size_write(inode, end_pos); | |
325 | btrfs_update_inode(trans, root, inode); | |
39279cc3 CM |
326 | } |
327 | failed: | |
a52d9a80 CM |
328 | err = btrfs_end_transaction(trans, root); |
329 | out_unlock: | |
330 | mutex_unlock(&root->fs_info->fs_mutex); | |
b888db2b | 331 | unlock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS); |
a52d9a80 | 332 | free_extent_map(em); |
011410bd | 333 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
334 | return err; |
335 | } | |
336 | ||
a52d9a80 CM |
337 | int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end) |
338 | { | |
339 | struct extent_map *em; | |
340 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
341 | ||
342 | while(1) { | |
343 | em = lookup_extent_mapping(em_tree, start, end); | |
344 | if (!em) | |
345 | break; | |
346 | remove_extent_mapping(em_tree, em); | |
347 | /* once for us */ | |
348 | free_extent_map(em); | |
349 | /* once for the tree*/ | |
350 | free_extent_map(em); | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | ||
39279cc3 CM |
355 | /* |
356 | * this is very complex, but the basic idea is to drop all extents | |
357 | * in the range start - end. hint_block is filled in with a block number | |
358 | * that would be a good hint to the block allocator for this file. | |
359 | * | |
360 | * If an extent intersects the range but is not entirely inside the range | |
361 | * it is either truncated or split. Anything entirely inside the range | |
362 | * is deleted from the tree. | |
363 | */ | |
364 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, | |
365 | struct btrfs_root *root, struct inode *inode, | |
3326d1b0 | 366 | u64 start, u64 end, u64 inline_end, u64 *hint_byte) |
39279cc3 CM |
367 | { |
368 | int ret; | |
369 | struct btrfs_key key; | |
5f39d397 | 370 | struct extent_buffer *leaf; |
39279cc3 CM |
371 | int slot; |
372 | struct btrfs_file_extent_item *extent; | |
373 | u64 extent_end = 0; | |
374 | int keep; | |
375 | struct btrfs_file_extent_item old; | |
376 | struct btrfs_path *path; | |
377 | u64 search_start = start; | |
378 | int bookend; | |
379 | int found_type; | |
380 | int found_extent; | |
381 | int found_inline; | |
ccd467d6 | 382 | int recow; |
39279cc3 | 383 | |
a52d9a80 CM |
384 | btrfs_drop_extent_cache(inode, start, end - 1); |
385 | ||
39279cc3 CM |
386 | path = btrfs_alloc_path(); |
387 | if (!path) | |
388 | return -ENOMEM; | |
389 | while(1) { | |
ccd467d6 | 390 | recow = 0; |
39279cc3 CM |
391 | btrfs_release_path(root, path); |
392 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
393 | search_start, -1); | |
394 | if (ret < 0) | |
395 | goto out; | |
396 | if (ret > 0) { | |
397 | if (path->slots[0] == 0) { | |
398 | ret = 0; | |
399 | goto out; | |
400 | } | |
401 | path->slots[0]--; | |
402 | } | |
8c2383c3 | 403 | next_slot: |
39279cc3 CM |
404 | keep = 0; |
405 | bookend = 0; | |
406 | found_extent = 0; | |
407 | found_inline = 0; | |
408 | extent = NULL; | |
5f39d397 | 409 | leaf = path->nodes[0]; |
39279cc3 | 410 | slot = path->slots[0]; |
8c2383c3 | 411 | ret = 0; |
5f39d397 | 412 | btrfs_item_key_to_cpu(leaf, &key, slot); |
39279cc3 | 413 | if (key.offset >= end || key.objectid != inode->i_ino) { |
39279cc3 CM |
414 | goto out; |
415 | } | |
8c2383c3 | 416 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY) { |
39279cc3 CM |
417 | goto out; |
418 | } | |
ccd467d6 CM |
419 | if (recow) { |
420 | search_start = key.offset; | |
421 | continue; | |
422 | } | |
8c2383c3 CM |
423 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
424 | extent = btrfs_item_ptr(leaf, slot, | |
425 | struct btrfs_file_extent_item); | |
5f39d397 | 426 | found_type = btrfs_file_extent_type(leaf, extent); |
8c2383c3 CM |
427 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
428 | extent_end = key.offset + | |
db94535d | 429 | btrfs_file_extent_num_bytes(leaf, extent); |
8c2383c3 CM |
430 | found_extent = 1; |
431 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 CM |
432 | struct btrfs_item *item; |
433 | item = btrfs_item_nr(leaf, slot); | |
8c2383c3 CM |
434 | found_inline = 1; |
435 | extent_end = key.offset + | |
5f39d397 | 436 | btrfs_file_extent_inline_len(leaf, item); |
8c2383c3 CM |
437 | } |
438 | } else { | |
439 | extent_end = search_start; | |
39279cc3 CM |
440 | } |
441 | ||
442 | /* we found nothing we can drop */ | |
8c2383c3 CM |
443 | if ((!found_extent && !found_inline) || |
444 | search_start >= extent_end) { | |
445 | int nextret; | |
446 | u32 nritems; | |
5f39d397 | 447 | nritems = btrfs_header_nritems(leaf); |
8c2383c3 CM |
448 | if (slot >= nritems - 1) { |
449 | nextret = btrfs_next_leaf(root, path); | |
450 | if (nextret) | |
451 | goto out; | |
ccd467d6 | 452 | recow = 1; |
8c2383c3 CM |
453 | } else { |
454 | path->slots[0]++; | |
455 | } | |
456 | goto next_slot; | |
39279cc3 CM |
457 | } |
458 | ||
459 | /* FIXME, there's only one inline extent allowed right now */ | |
460 | if (found_inline) { | |
5f39d397 | 461 | u64 mask = root->sectorsize - 1; |
39279cc3 CM |
462 | search_start = (extent_end + mask) & ~mask; |
463 | } else | |
464 | search_start = extent_end; | |
465 | ||
466 | if (end < extent_end && end >= key.offset) { | |
467 | if (found_extent) { | |
db94535d CM |
468 | u64 disk_bytenr = |
469 | btrfs_file_extent_disk_bytenr(leaf, extent); | |
470 | u64 disk_num_bytes = | |
471 | btrfs_file_extent_disk_num_bytes(leaf, | |
5f39d397 CM |
472 | extent); |
473 | read_extent_buffer(leaf, &old, | |
474 | (unsigned long)extent, | |
475 | sizeof(old)); | |
db94535d | 476 | if (disk_bytenr != 0) { |
39279cc3 | 477 | ret = btrfs_inc_extent_ref(trans, root, |
db94535d | 478 | disk_bytenr, disk_num_bytes); |
39279cc3 CM |
479 | BUG_ON(ret); |
480 | } | |
481 | } | |
3326d1b0 CM |
482 | if (!found_inline) |
483 | bookend = 1; | |
39279cc3 | 484 | } |
39279cc3 CM |
485 | /* truncate existing extent */ |
486 | if (start > key.offset) { | |
487 | u64 new_num; | |
488 | u64 old_num; | |
489 | keep = 1; | |
5f39d397 | 490 | WARN_ON(start & (root->sectorsize - 1)); |
39279cc3 | 491 | if (found_extent) { |
db94535d CM |
492 | new_num = start - key.offset; |
493 | old_num = btrfs_file_extent_num_bytes(leaf, | |
494 | extent); | |
495 | *hint_byte = | |
496 | btrfs_file_extent_disk_bytenr(leaf, | |
497 | extent); | |
498 | if (btrfs_file_extent_disk_bytenr(leaf, | |
499 | extent)) { | |
39279cc3 | 500 | inode->i_blocks -= |
db94535d | 501 | (old_num - new_num) >> 9; |
39279cc3 | 502 | } |
db94535d CM |
503 | btrfs_set_file_extent_num_bytes(leaf, extent, |
504 | new_num); | |
5f39d397 | 505 | btrfs_mark_buffer_dirty(leaf); |
3326d1b0 CM |
506 | } else if (end > extent_end && |
507 | key.offset < inline_end && | |
508 | inline_end < extent_end) { | |
509 | u32 new_size; | |
510 | new_size = btrfs_file_extent_calc_inline_size( | |
511 | inline_end - key.offset); | |
512 | btrfs_truncate_item(trans, root, path, | |
513 | new_size); | |
39279cc3 CM |
514 | } |
515 | } | |
516 | /* delete the entire extent */ | |
517 | if (!keep) { | |
db94535d CM |
518 | u64 disk_bytenr = 0; |
519 | u64 disk_num_bytes = 0; | |
520 | u64 extent_num_bytes = 0; | |
39279cc3 | 521 | if (found_extent) { |
db94535d CM |
522 | disk_bytenr = |
523 | btrfs_file_extent_disk_bytenr(leaf, | |
5f39d397 | 524 | extent); |
db94535d CM |
525 | disk_num_bytes = |
526 | btrfs_file_extent_disk_num_bytes(leaf, | |
5f39d397 | 527 | extent); |
db94535d CM |
528 | extent_num_bytes = |
529 | btrfs_file_extent_num_bytes(leaf, extent); | |
530 | *hint_byte = | |
531 | btrfs_file_extent_disk_bytenr(leaf, | |
532 | extent); | |
39279cc3 CM |
533 | } |
534 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d | 535 | /* TODO update progress marker and return */ |
39279cc3 CM |
536 | BUG_ON(ret); |
537 | btrfs_release_path(root, path); | |
538 | extent = NULL; | |
db94535d CM |
539 | if (found_extent && disk_bytenr != 0) { |
540 | inode->i_blocks -= extent_num_bytes >> 9; | |
39279cc3 | 541 | ret = btrfs_free_extent(trans, root, |
db94535d CM |
542 | disk_bytenr, |
543 | disk_num_bytes, 0); | |
39279cc3 CM |
544 | } |
545 | ||
546 | BUG_ON(ret); | |
547 | if (!bookend && search_start >= end) { | |
548 | ret = 0; | |
549 | goto out; | |
550 | } | |
551 | if (!bookend) | |
552 | continue; | |
553 | } | |
554 | /* create bookend, splitting the extent in two */ | |
555 | if (bookend && found_extent) { | |
556 | struct btrfs_key ins; | |
557 | ins.objectid = inode->i_ino; | |
558 | ins.offset = end; | |
39279cc3 | 559 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); |
39279cc3 CM |
560 | btrfs_release_path(root, path); |
561 | ret = btrfs_insert_empty_item(trans, root, path, &ins, | |
562 | sizeof(*extent)); | |
8c2383c3 | 563 | |
5f39d397 | 564 | leaf = path->nodes[0]; |
8c2383c3 | 565 | if (ret) { |
5f39d397 CM |
566 | btrfs_print_leaf(root, leaf); |
567 | 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 | 568 | } |
39279cc3 | 569 | BUG_ON(ret); |
5f39d397 CM |
570 | extent = btrfs_item_ptr(leaf, path->slots[0], |
571 | struct btrfs_file_extent_item); | |
572 | write_extent_buffer(leaf, &old, | |
573 | (unsigned long)extent, sizeof(old)); | |
574 | ||
575 | btrfs_set_file_extent_offset(leaf, extent, | |
db94535d CM |
576 | le64_to_cpu(old.offset) + end - key.offset); |
577 | WARN_ON(le64_to_cpu(old.num_bytes) < | |
578 | (extent_end - end)); | |
579 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
580 | extent_end - end); | |
5f39d397 | 581 | btrfs_set_file_extent_type(leaf, extent, |
39279cc3 | 582 | BTRFS_FILE_EXTENT_REG); |
db94535d | 583 | |
39279cc3 | 584 | btrfs_mark_buffer_dirty(path->nodes[0]); |
db94535d | 585 | if (le64_to_cpu(old.disk_bytenr) != 0) { |
39279cc3 | 586 | inode->i_blocks += |
db94535d CM |
587 | btrfs_file_extent_num_bytes(leaf, |
588 | extent) >> 9; | |
39279cc3 CM |
589 | } |
590 | ret = 0; | |
591 | goto out; | |
592 | } | |
593 | } | |
594 | out: | |
595 | btrfs_free_path(path); | |
596 | return ret; | |
597 | } | |
598 | ||
599 | /* | |
600 | * this gets pages into the page cache and locks them down | |
601 | */ | |
602 | static int prepare_pages(struct btrfs_root *root, | |
603 | struct file *file, | |
604 | struct page **pages, | |
605 | size_t num_pages, | |
606 | loff_t pos, | |
607 | unsigned long first_index, | |
608 | unsigned long last_index, | |
8c2383c3 | 609 | size_t write_bytes) |
39279cc3 CM |
610 | { |
611 | int i; | |
612 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
613 | struct inode *inode = file->f_path.dentry->d_inode; | |
39279cc3 | 614 | int err = 0; |
8c2383c3 | 615 | u64 start_pos; |
8c2383c3 | 616 | |
5f39d397 | 617 | start_pos = pos & ~((u64)root->sectorsize - 1); |
39279cc3 CM |
618 | |
619 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
620 | ||
621 | for (i = 0; i < num_pages; i++) { | |
622 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
623 | if (!pages[i]) { | |
624 | err = -ENOMEM; | |
a52d9a80 | 625 | BUG_ON(1); |
39279cc3 | 626 | } |
ccd467d6 CM |
627 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
628 | wait_on_page_writeback(pages[i]); | |
b3cfa35a | 629 | set_page_extent_mapped(pages[i]); |
b888db2b | 630 | WARN_ON(!PageLocked(pages[i])); |
39279cc3 CM |
631 | } |
632 | return 0; | |
39279cc3 CM |
633 | } |
634 | ||
635 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
636 | size_t count, loff_t *ppos) | |
637 | { | |
638 | loff_t pos; | |
2ff3e9b6 CM |
639 | loff_t start_pos; |
640 | ssize_t num_written = 0; | |
641 | ssize_t err = 0; | |
39279cc3 CM |
642 | int ret = 0; |
643 | struct inode *inode = file->f_path.dentry->d_inode; | |
644 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8c2383c3 CM |
645 | struct page **pages = NULL; |
646 | int nrptrs; | |
39279cc3 CM |
647 | struct page *pinned[2]; |
648 | unsigned long first_index; | |
649 | unsigned long last_index; | |
8c2383c3 CM |
650 | |
651 | nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE, | |
652 | PAGE_CACHE_SIZE / (sizeof(struct page *))); | |
39279cc3 CM |
653 | pinned[0] = NULL; |
654 | pinned[1] = NULL; | |
655 | if (file->f_flags & O_DIRECT) | |
656 | return -EINVAL; | |
2ff3e9b6 | 657 | |
39279cc3 | 658 | pos = *ppos; |
2ff3e9b6 CM |
659 | start_pos = pos; |
660 | ||
39279cc3 CM |
661 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
662 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
663 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
664 | if (err) | |
665 | goto out; | |
666 | if (count == 0) | |
667 | goto out; | |
668 | err = remove_suid(file->f_path.dentry); | |
669 | if (err) | |
670 | goto out; | |
671 | file_update_time(file); | |
672 | ||
8c2383c3 | 673 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
39279cc3 CM |
674 | |
675 | mutex_lock(&inode->i_mutex); | |
676 | first_index = pos >> PAGE_CACHE_SHIFT; | |
677 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
678 | ||
679 | /* | |
680 | * there are lots of better ways to do this, but this code | |
681 | * makes sure the first and last page in the file range are | |
682 | * up to date and ready for cow | |
683 | */ | |
684 | if ((pos & (PAGE_CACHE_SIZE - 1))) { | |
685 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
686 | if (!PageUptodate(pinned[0])) { | |
9ebefb18 | 687 | ret = btrfs_readpage(NULL, pinned[0]); |
39279cc3 CM |
688 | BUG_ON(ret); |
689 | wait_on_page_locked(pinned[0]); | |
690 | } else { | |
691 | unlock_page(pinned[0]); | |
692 | } | |
693 | } | |
694 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { | |
695 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
696 | if (!PageUptodate(pinned[1])) { | |
9ebefb18 | 697 | ret = btrfs_readpage(NULL, pinned[1]); |
39279cc3 CM |
698 | BUG_ON(ret); |
699 | wait_on_page_locked(pinned[1]); | |
700 | } else { | |
701 | unlock_page(pinned[1]); | |
702 | } | |
703 | } | |
704 | ||
39279cc3 CM |
705 | while(count > 0) { |
706 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
11bd143f CM |
707 | size_t write_bytes = min(count, nrptrs * |
708 | (size_t)PAGE_CACHE_SIZE - | |
8c2383c3 | 709 | offset); |
39279cc3 CM |
710 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> |
711 | PAGE_CACHE_SHIFT; | |
712 | ||
8c2383c3 | 713 | WARN_ON(num_pages > nrptrs); |
39279cc3 CM |
714 | memset(pages, 0, sizeof(pages)); |
715 | ret = prepare_pages(root, file, pages, num_pages, | |
716 | pos, first_index, last_index, | |
8c2383c3 | 717 | write_bytes); |
54aa1f4d CM |
718 | if (ret) |
719 | goto out; | |
39279cc3 | 720 | |
39279cc3 CM |
721 | ret = btrfs_copy_from_user(pos, num_pages, |
722 | write_bytes, pages, buf); | |
54aa1f4d CM |
723 | if (ret) { |
724 | btrfs_drop_pages(pages, num_pages); | |
725 | goto out; | |
726 | } | |
39279cc3 CM |
727 | |
728 | ret = dirty_and_release_pages(NULL, root, file, pages, | |
729 | num_pages, pos, write_bytes); | |
39279cc3 | 730 | btrfs_drop_pages(pages, num_pages); |
54aa1f4d CM |
731 | if (ret) |
732 | goto out; | |
39279cc3 CM |
733 | |
734 | buf += write_bytes; | |
735 | count -= write_bytes; | |
736 | pos += write_bytes; | |
737 | num_written += write_bytes; | |
738 | ||
8c2383c3 | 739 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages); |
d3c2fdcf | 740 | btrfs_btree_balance_dirty(root, 1); |
39279cc3 CM |
741 | cond_resched(); |
742 | } | |
39279cc3 CM |
743 | mutex_unlock(&inode->i_mutex); |
744 | out: | |
8c2383c3 | 745 | kfree(pages); |
39279cc3 CM |
746 | if (pinned[0]) |
747 | page_cache_release(pinned[0]); | |
748 | if (pinned[1]) | |
749 | page_cache_release(pinned[1]); | |
750 | *ppos = pos; | |
2ff3e9b6 CM |
751 | |
752 | if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) { | |
753 | err = sync_page_range(inode, inode->i_mapping, | |
754 | start_pos, num_written); | |
755 | if (err < 0) | |
756 | num_written = err; | |
757 | } | |
39279cc3 | 758 | current->backing_dev_info = NULL; |
39279cc3 CM |
759 | return num_written ? num_written : err; |
760 | } | |
761 | ||
39279cc3 CM |
762 | static int btrfs_sync_file(struct file *file, |
763 | struct dentry *dentry, int datasync) | |
764 | { | |
765 | struct inode *inode = dentry->d_inode; | |
766 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
15ee9bc7 | 767 | int ret = 0; |
39279cc3 CM |
768 | struct btrfs_trans_handle *trans; |
769 | ||
770 | /* | |
15ee9bc7 JB |
771 | * check the transaction that last modified this inode |
772 | * and see if its already been committed | |
39279cc3 CM |
773 | */ |
774 | mutex_lock(&root->fs_info->fs_mutex); | |
15ee9bc7 JB |
775 | if (!BTRFS_I(inode)->last_trans) |
776 | goto out; | |
777 | mutex_lock(&root->fs_info->trans_mutex); | |
778 | if (BTRFS_I(inode)->last_trans <= | |
779 | root->fs_info->last_trans_committed) { | |
780 | BTRFS_I(inode)->last_trans = 0; | |
781 | mutex_unlock(&root->fs_info->trans_mutex); | |
782 | goto out; | |
783 | } | |
784 | mutex_unlock(&root->fs_info->trans_mutex); | |
785 | ||
786 | /* | |
a52d9a80 CM |
787 | * ok we haven't committed the transaction yet, lets do a commit |
788 | */ | |
39279cc3 CM |
789 | trans = btrfs_start_transaction(root, 1); |
790 | if (!trans) { | |
791 | ret = -ENOMEM; | |
792 | goto out; | |
793 | } | |
794 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 | 795 | out: |
15ee9bc7 | 796 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
797 | return ret > 0 ? EIO : ret; |
798 | } | |
799 | ||
9ebefb18 | 800 | static struct vm_operations_struct btrfs_file_vm_ops = { |
92fee66d CM |
801 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) |
802 | .nopage = filemap_nopage, | |
803 | .populate = filemap_populate, | |
804 | #else | |
805 | .fault = filemap_fault, | |
806 | #endif | |
9ebefb18 CM |
807 | .page_mkwrite = btrfs_page_mkwrite, |
808 | }; | |
809 | ||
810 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
811 | { | |
812 | vma->vm_ops = &btrfs_file_vm_ops; | |
813 | file_accessed(filp); | |
814 | return 0; | |
815 | } | |
816 | ||
39279cc3 CM |
817 | struct file_operations btrfs_file_operations = { |
818 | .llseek = generic_file_llseek, | |
819 | .read = do_sync_read, | |
9ebefb18 | 820 | .aio_read = generic_file_aio_read, |
39279cc3 | 821 | .write = btrfs_file_write, |
9ebefb18 | 822 | .mmap = btrfs_file_mmap, |
39279cc3 | 823 | .open = generic_file_open, |
39279cc3 | 824 | .fsync = btrfs_sync_file, |
34287aa3 | 825 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 826 | #ifdef CONFIG_COMPAT |
34287aa3 | 827 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
828 | #endif |
829 | }; | |
830 |