blob: e81e428a8840529fc408bbb6a23777b32d8c37c0 [file] [log] [blame]
Chris Mason6cbd5572007-06-12 09:07:21 -04001/*
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
Chris Mason39279cc2007-06-12 06:35:45 -040019#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>
Chris Mason39279cc2007-06-12 06:35:45 -040025#include <linux/backing-dev.h>
26#include <linux/mpage.h>
Christoph Hellwig2fe17c12011-01-14 13:07:43 +010027#include <linux/falloc.h>
Chris Mason39279cc2007-06-12 06:35:45 -040028#include <linux/swap.h>
29#include <linux/writeback.h>
30#include <linux/statfs.h>
31#include <linux/compat.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Filipe Brandenburger55e301f2013-01-29 06:04:50 +000033#include <linux/btrfs.h>
Chris Mason39279cc2007-06-12 06:35:45 -040034#include "ctree.h"
35#include "disk-io.h"
36#include "transaction.h"
37#include "btrfs_inode.h"
Chris Mason39279cc2007-06-12 06:35:45 -040038#include "print-tree.h"
Chris Masone02119d2008-09-05 16:13:11 -040039#include "tree-log.h"
40#include "locking.h"
Jeff Mahoney12fa8ec2008-05-02 15:03:58 -040041#include "compat.h"
Josef Bacik2aaa6652012-08-29 14:27:18 -040042#include "volumes.h"
Chris Mason39279cc2007-06-12 06:35:45 -040043
Miao Xie9247f312012-11-26 09:24:43 +000044static struct kmem_cache *btrfs_inode_defrag_cachep;
Chris Mason4cb53002011-05-24 15:35:30 -040045/*
46 * when auto defrag is enabled we
47 * queue up these defrag structs to remember which
48 * inodes need defragging passes
49 */
50struct inode_defrag {
51 struct rb_node rb_node;
52 /* objectid */
53 u64 ino;
54 /*
55 * transid where the defrag was added, we search for
56 * extents newer than this
57 */
58 u64 transid;
59
60 /* root objectid */
61 u64 root;
62
63 /* last offset we were able to defrag */
64 u64 last_offset;
65
66 /* if we've wrapped around back to zero once already */
67 int cycled;
68};
69
Miao Xie762f2262012-05-24 18:58:27 +080070static int __compare_inode_defrag(struct inode_defrag *defrag1,
71 struct inode_defrag *defrag2)
72{
73 if (defrag1->root > defrag2->root)
74 return 1;
75 else if (defrag1->root < defrag2->root)
76 return -1;
77 else if (defrag1->ino > defrag2->ino)
78 return 1;
79 else if (defrag1->ino < defrag2->ino)
80 return -1;
81 else
82 return 0;
83}
84
Chris Mason4cb53002011-05-24 15:35:30 -040085/* pop a record for an inode into the defrag tree. The lock
86 * must be held already
87 *
88 * If you're inserting a record for an older transid than an
89 * existing record, the transid already in the tree is lowered
90 *
91 * If an existing record is found the defrag item you
92 * pass in is freed
93 */
Miao Xie8ddc4732012-11-26 09:25:38 +000094static int __btrfs_add_inode_defrag(struct inode *inode,
Chris Mason4cb53002011-05-24 15:35:30 -040095 struct inode_defrag *defrag)
96{
97 struct btrfs_root *root = BTRFS_I(inode)->root;
98 struct inode_defrag *entry;
99 struct rb_node **p;
100 struct rb_node *parent = NULL;
Miao Xie762f2262012-05-24 18:58:27 +0800101 int ret;
Chris Mason4cb53002011-05-24 15:35:30 -0400102
103 p = &root->fs_info->defrag_inodes.rb_node;
104 while (*p) {
105 parent = *p;
106 entry = rb_entry(parent, struct inode_defrag, rb_node);
107
Miao Xie762f2262012-05-24 18:58:27 +0800108 ret = __compare_inode_defrag(defrag, entry);
109 if (ret < 0)
Chris Mason4cb53002011-05-24 15:35:30 -0400110 p = &parent->rb_left;
Miao Xie762f2262012-05-24 18:58:27 +0800111 else if (ret > 0)
Chris Mason4cb53002011-05-24 15:35:30 -0400112 p = &parent->rb_right;
113 else {
114 /* if we're reinserting an entry for
115 * an old defrag run, make sure to
116 * lower the transid of our existing record
117 */
118 if (defrag->transid < entry->transid)
119 entry->transid = defrag->transid;
120 if (defrag->last_offset > entry->last_offset)
121 entry->last_offset = defrag->last_offset;
Miao Xie8ddc4732012-11-26 09:25:38 +0000122 return -EEXIST;
Chris Mason4cb53002011-05-24 15:35:30 -0400123 }
124 }
Josef Bacik72ac3c02012-05-23 14:13:11 -0400125 set_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags);
Chris Mason4cb53002011-05-24 15:35:30 -0400126 rb_link_node(&defrag->rb_node, parent, p);
127 rb_insert_color(&defrag->rb_node, &root->fs_info->defrag_inodes);
Miao Xie8ddc4732012-11-26 09:25:38 +0000128 return 0;
129}
Chris Mason4cb53002011-05-24 15:35:30 -0400130
Miao Xie8ddc4732012-11-26 09:25:38 +0000131static inline int __need_auto_defrag(struct btrfs_root *root)
132{
133 if (!btrfs_test_opt(root, AUTO_DEFRAG))
134 return 0;
Chris Mason4cb53002011-05-24 15:35:30 -0400135
Miao Xie8ddc4732012-11-26 09:25:38 +0000136 if (btrfs_fs_closing(root->fs_info))
137 return 0;
138
139 return 1;
Chris Mason4cb53002011-05-24 15:35:30 -0400140}
141
142/*
143 * insert a defrag record for this inode if auto defrag is
144 * enabled
145 */
146int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
147 struct inode *inode)
148{
149 struct btrfs_root *root = BTRFS_I(inode)->root;
150 struct inode_defrag *defrag;
Chris Mason4cb53002011-05-24 15:35:30 -0400151 u64 transid;
Miao Xie8ddc4732012-11-26 09:25:38 +0000152 int ret;
Chris Mason4cb53002011-05-24 15:35:30 -0400153
Miao Xie8ddc4732012-11-26 09:25:38 +0000154 if (!__need_auto_defrag(root))
Chris Mason4cb53002011-05-24 15:35:30 -0400155 return 0;
156
Josef Bacik72ac3c02012-05-23 14:13:11 -0400157 if (test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags))
Chris Mason4cb53002011-05-24 15:35:30 -0400158 return 0;
159
160 if (trans)
161 transid = trans->transid;
162 else
163 transid = BTRFS_I(inode)->root->last_trans;
164
Miao Xie9247f312012-11-26 09:24:43 +0000165 defrag = kmem_cache_zalloc(btrfs_inode_defrag_cachep, GFP_NOFS);
Chris Mason4cb53002011-05-24 15:35:30 -0400166 if (!defrag)
167 return -ENOMEM;
168
David Sterbaa4689d22011-05-31 17:08:14 +0000169 defrag->ino = btrfs_ino(inode);
Chris Mason4cb53002011-05-24 15:35:30 -0400170 defrag->transid = transid;
171 defrag->root = root->root_key.objectid;
172
173 spin_lock(&root->fs_info->defrag_inodes_lock);
Miao Xie8ddc4732012-11-26 09:25:38 +0000174 if (!test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags)) {
175 /*
176 * If we set IN_DEFRAG flag and evict the inode from memory,
177 * and then re-read this inode, this new inode doesn't have
178 * IN_DEFRAG flag. At the case, we may find the existed defrag.
179 */
180 ret = __btrfs_add_inode_defrag(inode, defrag);
181 if (ret)
182 kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
183 } else {
Miao Xie9247f312012-11-26 09:24:43 +0000184 kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
Miao Xie8ddc4732012-11-26 09:25:38 +0000185 }
Chris Mason4cb53002011-05-24 15:35:30 -0400186 spin_unlock(&root->fs_info->defrag_inodes_lock);
Wanlong Gaoa0f98dd2011-07-18 12:19:35 +0000187 return 0;
Chris Mason4cb53002011-05-24 15:35:30 -0400188}
189
190/*
Miao Xie8ddc4732012-11-26 09:25:38 +0000191 * Requeue the defrag object. If there is a defrag object that points to
192 * the same inode in the tree, we will merge them together (by
193 * __btrfs_add_inode_defrag()) and free the one that we want to requeue.
Chris Mason4cb53002011-05-24 15:35:30 -0400194 */
Miao Xie8ddc4732012-11-26 09:25:38 +0000195void btrfs_requeue_inode_defrag(struct inode *inode,
196 struct inode_defrag *defrag)
197{
198 struct btrfs_root *root = BTRFS_I(inode)->root;
199 int ret;
200
201 if (!__need_auto_defrag(root))
202 goto out;
203
204 /*
205 * Here we don't check the IN_DEFRAG flag, because we need merge
206 * them together.
207 */
208 spin_lock(&root->fs_info->defrag_inodes_lock);
209 ret = __btrfs_add_inode_defrag(inode, defrag);
210 spin_unlock(&root->fs_info->defrag_inodes_lock);
211 if (ret)
212 goto out;
213 return;
214out:
215 kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
216}
217
218/*
Miao Xie26176e72012-11-26 09:26:20 +0000219 * pick the defragable inode that we want, if it doesn't exist, we will get
220 * the next one.
Chris Mason4cb53002011-05-24 15:35:30 -0400221 */
Miao Xie26176e72012-11-26 09:26:20 +0000222static struct inode_defrag *
223btrfs_pick_defrag_inode(struct btrfs_fs_info *fs_info, u64 root, u64 ino)
Chris Mason4cb53002011-05-24 15:35:30 -0400224{
225 struct inode_defrag *entry = NULL;
Miao Xie762f2262012-05-24 18:58:27 +0800226 struct inode_defrag tmp;
Chris Mason4cb53002011-05-24 15:35:30 -0400227 struct rb_node *p;
228 struct rb_node *parent = NULL;
Miao Xie762f2262012-05-24 18:58:27 +0800229 int ret;
230
231 tmp.ino = ino;
232 tmp.root = root;
Chris Mason4cb53002011-05-24 15:35:30 -0400233
Miao Xie26176e72012-11-26 09:26:20 +0000234 spin_lock(&fs_info->defrag_inodes_lock);
235 p = fs_info->defrag_inodes.rb_node;
Chris Mason4cb53002011-05-24 15:35:30 -0400236 while (p) {
237 parent = p;
238 entry = rb_entry(parent, struct inode_defrag, rb_node);
239
Miao Xie762f2262012-05-24 18:58:27 +0800240 ret = __compare_inode_defrag(&tmp, entry);
241 if (ret < 0)
Chris Mason4cb53002011-05-24 15:35:30 -0400242 p = parent->rb_left;
Miao Xie762f2262012-05-24 18:58:27 +0800243 else if (ret > 0)
Chris Mason4cb53002011-05-24 15:35:30 -0400244 p = parent->rb_right;
245 else
Miao Xie26176e72012-11-26 09:26:20 +0000246 goto out;
Chris Mason4cb53002011-05-24 15:35:30 -0400247 }
248
Miao Xie26176e72012-11-26 09:26:20 +0000249 if (parent && __compare_inode_defrag(&tmp, entry) > 0) {
250 parent = rb_next(parent);
251 if (parent)
Chris Mason4cb53002011-05-24 15:35:30 -0400252 entry = rb_entry(parent, struct inode_defrag, rb_node);
Miao Xie26176e72012-11-26 09:26:20 +0000253 else
254 entry = NULL;
Chris Mason4cb53002011-05-24 15:35:30 -0400255 }
Miao Xie26176e72012-11-26 09:26:20 +0000256out:
257 if (entry)
258 rb_erase(parent, &fs_info->defrag_inodes);
259 spin_unlock(&fs_info->defrag_inodes_lock);
260 return entry;
261}
262
263void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info)
264{
265 struct inode_defrag *defrag;
266 struct rb_node *node;
267
268 spin_lock(&fs_info->defrag_inodes_lock);
269 node = rb_first(&fs_info->defrag_inodes);
270 while (node) {
271 rb_erase(node, &fs_info->defrag_inodes);
272 defrag = rb_entry(node, struct inode_defrag, rb_node);
273 kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
274
275 if (need_resched()) {
276 spin_unlock(&fs_info->defrag_inodes_lock);
277 cond_resched();
278 spin_lock(&fs_info->defrag_inodes_lock);
279 }
280
281 node = rb_first(&fs_info->defrag_inodes);
282 }
283 spin_unlock(&fs_info->defrag_inodes_lock);
284}
285
286#define BTRFS_DEFRAG_BATCH 1024
287
288static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
289 struct inode_defrag *defrag)
290{
291 struct btrfs_root *inode_root;
292 struct inode *inode;
293 struct btrfs_key key;
294 struct btrfs_ioctl_defrag_range_args range;
295 int num_defrag;
Liu Bo6f1c3602013-01-29 03:22:10 +0000296 int index;
297 int ret;
Miao Xie26176e72012-11-26 09:26:20 +0000298
299 /* get the inode */
300 key.objectid = defrag->root;
301 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
302 key.offset = (u64)-1;
Liu Bo6f1c3602013-01-29 03:22:10 +0000303
304 index = srcu_read_lock(&fs_info->subvol_srcu);
305
Miao Xie26176e72012-11-26 09:26:20 +0000306 inode_root = btrfs_read_fs_root_no_name(fs_info, &key);
307 if (IS_ERR(inode_root)) {
Liu Bo6f1c3602013-01-29 03:22:10 +0000308 ret = PTR_ERR(inode_root);
309 goto cleanup;
310 }
311 if (btrfs_root_refs(&inode_root->root_item) == 0) {
312 ret = -ENOENT;
313 goto cleanup;
Miao Xie26176e72012-11-26 09:26:20 +0000314 }
315
316 key.objectid = defrag->ino;
317 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
318 key.offset = 0;
319 inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL);
320 if (IS_ERR(inode)) {
Liu Bo6f1c3602013-01-29 03:22:10 +0000321 ret = PTR_ERR(inode);
322 goto cleanup;
Miao Xie26176e72012-11-26 09:26:20 +0000323 }
Liu Bo6f1c3602013-01-29 03:22:10 +0000324 srcu_read_unlock(&fs_info->subvol_srcu, index);
Miao Xie26176e72012-11-26 09:26:20 +0000325
326 /* do a chunk of defrag */
327 clear_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags);
328 memset(&range, 0, sizeof(range));
329 range.len = (u64)-1;
330 range.start = defrag->last_offset;
Miao Xieb66f00d2012-11-26 09:27:29 +0000331
332 sb_start_write(fs_info->sb);
Miao Xie26176e72012-11-26 09:26:20 +0000333 num_defrag = btrfs_defrag_file(inode, NULL, &range, defrag->transid,
334 BTRFS_DEFRAG_BATCH);
Miao Xieb66f00d2012-11-26 09:27:29 +0000335 sb_end_write(fs_info->sb);
Miao Xie26176e72012-11-26 09:26:20 +0000336 /*
337 * if we filled the whole defrag batch, there
338 * must be more work to do. Queue this defrag
339 * again
340 */
341 if (num_defrag == BTRFS_DEFRAG_BATCH) {
342 defrag->last_offset = range.start;
343 btrfs_requeue_inode_defrag(inode, defrag);
344 } else if (defrag->last_offset && !defrag->cycled) {
345 /*
346 * we didn't fill our defrag batch, but
347 * we didn't start at zero. Make sure we loop
348 * around to the start of the file.
349 */
350 defrag->last_offset = 0;
351 defrag->cycled = 1;
352 btrfs_requeue_inode_defrag(inode, defrag);
353 } else {
354 kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
355 }
356
357 iput(inode);
358 return 0;
Liu Bo6f1c3602013-01-29 03:22:10 +0000359cleanup:
360 srcu_read_unlock(&fs_info->subvol_srcu, index);
361 kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
362 return ret;
Chris Mason4cb53002011-05-24 15:35:30 -0400363}
364
365/*
366 * run through the list of inodes in the FS that need
367 * defragging
368 */
369int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info)
370{
371 struct inode_defrag *defrag;
Chris Mason4cb53002011-05-24 15:35:30 -0400372 u64 first_ino = 0;
Miao Xie762f2262012-05-24 18:58:27 +0800373 u64 root_objectid = 0;
Chris Mason4cb53002011-05-24 15:35:30 -0400374
375 atomic_inc(&fs_info->defrag_running);
Chris Mason4cb53002011-05-24 15:35:30 -0400376 while(1) {
Miao Xiedc81cdc2013-02-20 23:32:52 -0700377 /* Pause the auto defragger. */
378 if (test_bit(BTRFS_FS_STATE_REMOUNTING,
379 &fs_info->fs_state))
380 break;
381
Miao Xie26176e72012-11-26 09:26:20 +0000382 if (!__need_auto_defrag(fs_info->tree_root))
383 break;
Chris Mason4cb53002011-05-24 15:35:30 -0400384
385 /* find an inode to defrag */
Miao Xie26176e72012-11-26 09:26:20 +0000386 defrag = btrfs_pick_defrag_inode(fs_info, root_objectid,
387 first_ino);
Chris Mason4cb53002011-05-24 15:35:30 -0400388 if (!defrag) {
Miao Xie26176e72012-11-26 09:26:20 +0000389 if (root_objectid || first_ino) {
Miao Xie762f2262012-05-24 18:58:27 +0800390 root_objectid = 0;
Chris Mason4cb53002011-05-24 15:35:30 -0400391 first_ino = 0;
392 continue;
393 } else {
394 break;
395 }
396 }
397
Chris Mason4cb53002011-05-24 15:35:30 -0400398 first_ino = defrag->ino + 1;
Miao Xie762f2262012-05-24 18:58:27 +0800399 root_objectid = defrag->root;
Chris Mason4cb53002011-05-24 15:35:30 -0400400
Miao Xie26176e72012-11-26 09:26:20 +0000401 __btrfs_run_defrag_inode(fs_info, defrag);
Chris Mason4cb53002011-05-24 15:35:30 -0400402 }
Chris Mason4cb53002011-05-24 15:35:30 -0400403 atomic_dec(&fs_info->defrag_running);
404
405 /*
406 * during unmount, we use the transaction_wait queue to
407 * wait for the defragger to stop
408 */
409 wake_up(&fs_info->transaction_wait);
410 return 0;
411}
Chris Mason39279cc2007-06-12 06:35:45 -0400412
Chris Masond352ac62008-09-29 15:18:18 -0400413/* simple helper to fault in pages and copy. This should go away
414 * and be replaced with calls into generic code.
415 */
Chris Masond3977122009-01-05 21:25:51 -0500416static noinline int btrfs_copy_from_user(loff_t pos, int num_pages,
Josef Bacikd0215f32011-01-25 14:57:24 -0500417 size_t write_bytes,
Chris Masona1b32a52008-09-05 16:09:51 -0400418 struct page **prepared_pages,
Josef Bacik11c65dc2010-05-23 11:07:21 -0400419 struct iov_iter *i)
Chris Mason39279cc2007-06-12 06:35:45 -0400420{
Xin Zhong914ee292010-12-09 09:30:14 +0000421 size_t copied = 0;
Josef Bacikd0215f32011-01-25 14:57:24 -0500422 size_t total_copied = 0;
Josef Bacik11c65dc2010-05-23 11:07:21 -0400423 int pg = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400424 int offset = pos & (PAGE_CACHE_SIZE - 1);
425
Josef Bacik11c65dc2010-05-23 11:07:21 -0400426 while (write_bytes > 0) {
Chris Mason39279cc2007-06-12 06:35:45 -0400427 size_t count = min_t(size_t,
428 PAGE_CACHE_SIZE - offset, write_bytes);
Josef Bacik11c65dc2010-05-23 11:07:21 -0400429 struct page *page = prepared_pages[pg];
Xin Zhong914ee292010-12-09 09:30:14 +0000430 /*
431 * Copy data from userspace to the current page
432 *
433 * Disable pagefault to avoid recursive lock since
434 * the pages are already locked
435 */
436 pagefault_disable();
437 copied = iov_iter_copy_from_user_atomic(page, i, offset, count);
438 pagefault_enable();
Josef Bacik11c65dc2010-05-23 11:07:21 -0400439
Chris Mason39279cc2007-06-12 06:35:45 -0400440 /* Flush processor's dcache for this page */
441 flush_dcache_page(page);
Chris Mason31339ac2011-03-07 11:10:24 -0500442
443 /*
444 * if we get a partial write, we can end up with
445 * partially up to date pages. These add
446 * a lot of complexity, so make sure they don't
447 * happen by forcing this copy to be retried.
448 *
449 * The rest of the btrfs_file_write code will fall
450 * back to page at a time copies after we return 0.
451 */
452 if (!PageUptodate(page) && copied < count)
453 copied = 0;
454
Josef Bacik11c65dc2010-05-23 11:07:21 -0400455 iov_iter_advance(i, copied);
456 write_bytes -= copied;
Xin Zhong914ee292010-12-09 09:30:14 +0000457 total_copied += copied;
Chris Mason39279cc2007-06-12 06:35:45 -0400458
Xin Zhong914ee292010-12-09 09:30:14 +0000459 /* Return to btrfs_file_aio_write to fault page */
Josef Bacik9f570b82011-01-25 12:42:37 -0500460 if (unlikely(copied == 0))
Xin Zhong914ee292010-12-09 09:30:14 +0000461 break;
Josef Bacik11c65dc2010-05-23 11:07:21 -0400462
463 if (unlikely(copied < PAGE_CACHE_SIZE - offset)) {
464 offset += copied;
465 } else {
466 pg++;
467 offset = 0;
468 }
Chris Mason39279cc2007-06-12 06:35:45 -0400469 }
Xin Zhong914ee292010-12-09 09:30:14 +0000470 return total_copied;
Chris Mason39279cc2007-06-12 06:35:45 -0400471}
472
Chris Masond352ac62008-09-29 15:18:18 -0400473/*
474 * unlocks pages after btrfs_file_write is done with them
475 */
Josef Bacikbe1a12a2011-04-06 13:05:22 -0400476void btrfs_drop_pages(struct page **pages, size_t num_pages)
Chris Mason39279cc2007-06-12 06:35:45 -0400477{
478 size_t i;
479 for (i = 0; i < num_pages; i++) {
Chris Masond352ac62008-09-29 15:18:18 -0400480 /* page checked is some magic around finding pages that
481 * have been modified without going through btrfs_set_page_dirty
482 * clear it here
483 */
Chris Mason4a096752008-07-21 10:29:44 -0400484 ClearPageChecked(pages[i]);
Chris Mason39279cc2007-06-12 06:35:45 -0400485 unlock_page(pages[i]);
486 mark_page_accessed(pages[i]);
487 page_cache_release(pages[i]);
488 }
489}
490
Chris Masond352ac62008-09-29 15:18:18 -0400491/*
492 * after copy_from_user, pages need to be dirtied and we need to make
493 * sure holes are created between the current EOF and the start of
494 * any next extents (if required).
495 *
496 * this also makes the decision about creating an inline extent vs
497 * doing real data extents, marking pages dirty and delalloc as required.
498 */
Josef Bacikbe1a12a2011-04-06 13:05:22 -0400499int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
500 struct page **pages, size_t num_pages,
501 loff_t pos, size_t write_bytes,
502 struct extent_state **cached)
Chris Mason39279cc2007-06-12 06:35:45 -0400503{
Chris Mason39279cc2007-06-12 06:35:45 -0400504 int err = 0;
Chris Masona52d9a82007-08-27 16:49:44 -0400505 int i;
Chris Masondb945352007-10-15 16:15:53 -0400506 u64 num_bytes;
Chris Masona52d9a82007-08-27 16:49:44 -0400507 u64 start_pos;
508 u64 end_of_last_block;
509 u64 end_pos = pos + write_bytes;
510 loff_t isize = i_size_read(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400511
Chris Mason5f39d392007-10-15 16:14:19 -0400512 start_pos = pos & ~((u64)root->sectorsize - 1);
Qu Wenruofda28322013-02-26 08:10:22 +0000513 num_bytes = ALIGN(write_bytes + pos - start_pos, root->sectorsize);
Chris Mason39279cc2007-06-12 06:35:45 -0400514
Chris Masondb945352007-10-15 16:15:53 -0400515 end_of_last_block = start_pos + num_bytes - 1;
Josef Bacik2ac55d42010-02-03 19:33:23 +0000516 err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block,
Josef Bacikbe1a12a2011-04-06 13:05:22 -0400517 cached);
Josef Bacikd0215f32011-01-25 14:57:24 -0500518 if (err)
519 return err;
Josef Bacik9ed74f22009-09-11 16:12:44 -0400520
Chris Masonc8b97812008-10-29 14:49:59 -0400521 for (i = 0; i < num_pages; i++) {
522 struct page *p = pages[i];
523 SetPageUptodate(p);
524 ClearPageChecked(p);
525 set_page_dirty(p);
Chris Masona52d9a82007-08-27 16:49:44 -0400526 }
Josef Bacik9f570b82011-01-25 12:42:37 -0500527
528 /*
529 * we've only changed i_size in ram, and we haven't updated
530 * the disk i_size. There is no need to log the inode
531 * at this time.
532 */
533 if (end_pos > isize)
Chris Masona52d9a82007-08-27 16:49:44 -0400534 i_size_write(inode, end_pos);
Yan, Zhenga22285a2010-05-16 10:48:46 -0400535 return 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400536}
537
Chris Masond352ac62008-09-29 15:18:18 -0400538/*
539 * this drops all the extents in the cache that intersect the range
540 * [start, end]. Existing extents are split as required.
541 */
Josef Bacik7014cdb2012-08-30 20:06:49 -0400542void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
543 int skip_pinned)
Chris Masona52d9a82007-08-27 16:49:44 -0400544{
545 struct extent_map *em;
Chris Mason3b951512008-04-17 11:29:12 -0400546 struct extent_map *split = NULL;
547 struct extent_map *split2 = NULL;
Chris Masona52d9a82007-08-27 16:49:44 -0400548 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
Yan39b56372008-02-15 10:40:50 -0500549 u64 len = end - start + 1;
Josef Bacik5dc562c2012-08-17 13:14:17 -0400550 u64 gen;
Chris Mason3b951512008-04-17 11:29:12 -0400551 int ret;
552 int testend = 1;
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400553 unsigned long flags;
Chris Masonc8b97812008-10-29 14:49:59 -0400554 int compressed = 0;
Chris Masona52d9a82007-08-27 16:49:44 -0400555
Chris Masone6dcd2d2008-07-17 12:53:50 -0400556 WARN_ON(end < start);
Chris Mason3b951512008-04-17 11:29:12 -0400557 if (end == (u64)-1) {
Yan39b56372008-02-15 10:40:50 -0500558 len = (u64)-1;
Chris Mason3b951512008-04-17 11:29:12 -0400559 testend = 0;
560 }
Chris Masond3977122009-01-05 21:25:51 -0500561 while (1) {
Josef Bacik7014cdb2012-08-30 20:06:49 -0400562 int no_splits = 0;
563
Chris Mason3b951512008-04-17 11:29:12 -0400564 if (!split)
David Sterba172ddd62011-04-21 00:48:27 +0200565 split = alloc_extent_map();
Chris Mason3b951512008-04-17 11:29:12 -0400566 if (!split2)
David Sterba172ddd62011-04-21 00:48:27 +0200567 split2 = alloc_extent_map();
Josef Bacik7014cdb2012-08-30 20:06:49 -0400568 if (!split || !split2)
569 no_splits = 1;
Chris Mason3b951512008-04-17 11:29:12 -0400570
Chris Mason890871b2009-09-02 16:24:52 -0400571 write_lock(&em_tree->lock);
Yan39b56372008-02-15 10:40:50 -0500572 em = lookup_extent_mapping(em_tree, start, len);
Chris Masond1310b22008-01-24 16:13:08 -0500573 if (!em) {
Chris Mason890871b2009-09-02 16:24:52 -0400574 write_unlock(&em_tree->lock);
Chris Masona52d9a82007-08-27 16:49:44 -0400575 break;
Chris Masond1310b22008-01-24 16:13:08 -0500576 }
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400577 flags = em->flags;
Josef Bacik5dc562c2012-08-17 13:14:17 -0400578 gen = em->generation;
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400579 if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
Yan, Zheng55ef6892009-11-12 09:36:44 +0000580 if (testend && em->start + em->len >= start + len) {
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400581 free_extent_map(em);
Chris Masona1ed8352009-09-11 12:27:37 -0400582 write_unlock(&em_tree->lock);
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400583 break;
584 }
Yan, Zheng55ef6892009-11-12 09:36:44 +0000585 start = em->start + em->len;
586 if (testend)
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400587 len = start + len - (em->start + em->len);
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400588 free_extent_map(em);
Chris Masona1ed8352009-09-11 12:27:37 -0400589 write_unlock(&em_tree->lock);
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400590 continue;
591 }
Chris Masonc8b97812008-10-29 14:49:59 -0400592 compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
Chris Mason3ce7e672008-07-31 15:42:54 -0400593 clear_bit(EXTENT_FLAG_PINNED, &em->flags);
Liu Bo3b277592013-03-15 08:46:39 -0600594 clear_bit(EXTENT_FLAG_LOGGING, &flags);
Chris Masona52d9a82007-08-27 16:49:44 -0400595 remove_extent_mapping(em_tree, em);
Josef Bacik7014cdb2012-08-30 20:06:49 -0400596 if (no_splits)
597 goto next;
Chris Mason3b951512008-04-17 11:29:12 -0400598
599 if (em->block_start < EXTENT_MAP_LAST_BYTE &&
600 em->start < start) {
601 split->start = em->start;
602 split->len = start - em->start;
Yan Zhengff5b7ee2008-11-10 07:34:43 -0500603 split->orig_start = em->orig_start;
Chris Mason3b951512008-04-17 11:29:12 -0400604 split->block_start = em->block_start;
Chris Masonc8b97812008-10-29 14:49:59 -0400605
606 if (compressed)
607 split->block_len = em->block_len;
608 else
609 split->block_len = split->len;
Josef Bacikcc95bef2013-04-04 14:31:27 -0400610 split->ram_bytes = em->ram_bytes;
Josef Bacikb4939682012-12-03 10:31:19 -0500611 split->orig_block_len = max(split->block_len,
612 em->orig_block_len);
Josef Bacik5dc562c2012-08-17 13:14:17 -0400613 split->generation = gen;
Chris Mason3b951512008-04-17 11:29:12 -0400614 split->bdev = em->bdev;
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400615 split->flags = flags;
Li Zefan261507a02010-12-17 14:21:50 +0800616 split->compress_type = em->compress_type;
Chris Mason3b951512008-04-17 11:29:12 -0400617 ret = add_extent_mapping(em_tree, split);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100618 BUG_ON(ret); /* Logic error */
Josef Bacik5dc562c2012-08-17 13:14:17 -0400619 list_move(&split->list, &em_tree->modified_extents);
Chris Mason3b951512008-04-17 11:29:12 -0400620 free_extent_map(split);
621 split = split2;
622 split2 = NULL;
623 }
624 if (em->block_start < EXTENT_MAP_LAST_BYTE &&
625 testend && em->start + em->len > start + len) {
626 u64 diff = start + len - em->start;
627
628 split->start = start + len;
629 split->len = em->start + em->len - (start + len);
630 split->bdev = em->bdev;
Zheng Yan5b21f2e2008-09-26 10:05:38 -0400631 split->flags = flags;
Li Zefan261507a02010-12-17 14:21:50 +0800632 split->compress_type = em->compress_type;
Josef Bacik5dc562c2012-08-17 13:14:17 -0400633 split->generation = gen;
Josef Bacikb4939682012-12-03 10:31:19 -0500634 split->orig_block_len = max(em->block_len,
635 em->orig_block_len);
Josef Bacikcc95bef2013-04-04 14:31:27 -0400636 split->ram_bytes = em->ram_bytes;
Chris Mason3b951512008-04-17 11:29:12 -0400637
Chris Masonc8b97812008-10-29 14:49:59 -0400638 if (compressed) {
639 split->block_len = em->block_len;
640 split->block_start = em->block_start;
Chris Mason445a6942008-11-10 11:53:33 -0500641 split->orig_start = em->orig_start;
Chris Masonc8b97812008-10-29 14:49:59 -0400642 } else {
643 split->block_len = split->len;
644 split->block_start = em->block_start + diff;
Josef Bacik70c8a912012-10-11 16:54:30 -0400645 split->orig_start = em->orig_start;
Chris Masonc8b97812008-10-29 14:49:59 -0400646 }
Chris Mason3b951512008-04-17 11:29:12 -0400647
648 ret = add_extent_mapping(em_tree, split);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100649 BUG_ON(ret); /* Logic error */
Josef Bacik5dc562c2012-08-17 13:14:17 -0400650 list_move(&split->list, &em_tree->modified_extents);
Chris Mason3b951512008-04-17 11:29:12 -0400651 free_extent_map(split);
652 split = NULL;
653 }
Josef Bacik7014cdb2012-08-30 20:06:49 -0400654next:
Chris Mason890871b2009-09-02 16:24:52 -0400655 write_unlock(&em_tree->lock);
Chris Masond1310b22008-01-24 16:13:08 -0500656
Chris Masona52d9a82007-08-27 16:49:44 -0400657 /* once for us */
658 free_extent_map(em);
659 /* once for the tree*/
660 free_extent_map(em);
661 }
Chris Mason3b951512008-04-17 11:29:12 -0400662 if (split)
663 free_extent_map(split);
664 if (split2)
665 free_extent_map(split2);
Chris Masona52d9a82007-08-27 16:49:44 -0400666}
667
Chris Mason39279cc2007-06-12 06:35:45 -0400668/*
669 * this is very complex, but the basic idea is to drop all extents
670 * in the range start - end. hint_block is filled in with a block number
671 * that would be a good hint to the block allocator for this file.
672 *
673 * If an extent intersects the range but is not entirely inside the range
674 * it is either truncated or split. Anything entirely inside the range
675 * is deleted from the tree.
676 */
Josef Bacik5dc562c2012-08-17 13:14:17 -0400677int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
678 struct btrfs_root *root, struct inode *inode,
679 struct btrfs_path *path, u64 start, u64 end,
Josef Bacik2aaa6652012-08-29 14:27:18 -0400680 u64 *drop_end, int drop_cache)
Chris Mason39279cc2007-06-12 06:35:45 -0400681{
Chris Mason00f5c792007-11-30 10:09:33 -0500682 struct extent_buffer *leaf;
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000683 struct btrfs_file_extent_item *fi;
Chris Mason00f5c792007-11-30 10:09:33 -0500684 struct btrfs_key key;
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000685 struct btrfs_key new_key;
Li Zefan33345d012011-04-20 10:31:50 +0800686 u64 ino = btrfs_ino(inode);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000687 u64 search_start = start;
688 u64 disk_bytenr = 0;
689 u64 num_bytes = 0;
690 u64 extent_offset = 0;
691 u64 extent_end = 0;
692 int del_nr = 0;
693 int del_slot = 0;
694 int extent_type;
Chris Masonccd467d2007-06-28 15:57:36 -0400695 int recow;
Chris Mason00f5c792007-11-30 10:09:33 -0500696 int ret;
Chris Masondc7fdde2012-04-27 14:31:29 -0400697 int modify_tree = -1;
Josef Bacik5dc562c2012-08-17 13:14:17 -0400698 int update_refs = (root->ref_cows || root == root->fs_info->tree_root);
Josef Bacikc3308f82012-09-14 14:51:22 -0400699 int found = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400700
Chris Masona1ed8352009-09-11 12:27:37 -0400701 if (drop_cache)
702 btrfs_drop_extent_cache(inode, start, end - 1, 0);
Chris Masona52d9a82007-08-27 16:49:44 -0400703
Chris Masondc7fdde2012-04-27 14:31:29 -0400704 if (start >= BTRFS_I(inode)->disk_i_size)
705 modify_tree = 0;
706
Chris Masond3977122009-01-05 21:25:51 -0500707 while (1) {
Chris Masonccd467d2007-06-28 15:57:36 -0400708 recow = 0;
Li Zefan33345d012011-04-20 10:31:50 +0800709 ret = btrfs_lookup_file_extent(trans, root, path, ino,
Chris Masondc7fdde2012-04-27 14:31:29 -0400710 search_start, modify_tree);
Chris Mason39279cc2007-06-12 06:35:45 -0400711 if (ret < 0)
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000712 break;
713 if (ret > 0 && path->slots[0] > 0 && search_start == start) {
714 leaf = path->nodes[0];
715 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
Li Zefan33345d012011-04-20 10:31:50 +0800716 if (key.objectid == ino &&
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000717 key.type == BTRFS_EXTENT_DATA_KEY)
718 path->slots[0]--;
Chris Mason39279cc2007-06-12 06:35:45 -0400719 }
Chris Mason8c2383c2007-06-18 09:57:58 -0400720 ret = 0;
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000721next_slot:
722 leaf = path->nodes[0];
723 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
724 BUG_ON(del_nr > 0);
725 ret = btrfs_next_leaf(root, path);
726 if (ret < 0)
727 break;
728 if (ret > 0) {
729 ret = 0;
730 break;
Chris Mason8c2383c2007-06-18 09:57:58 -0400731 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000732 leaf = path->nodes[0];
733 recow = 1;
734 }
735
736 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
Li Zefan33345d012011-04-20 10:31:50 +0800737 if (key.objectid > ino ||
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000738 key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end)
739 break;
740
741 fi = btrfs_item_ptr(leaf, path->slots[0],
742 struct btrfs_file_extent_item);
743 extent_type = btrfs_file_extent_type(leaf, fi);
744
745 if (extent_type == BTRFS_FILE_EXTENT_REG ||
746 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
747 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
748 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
749 extent_offset = btrfs_file_extent_offset(leaf, fi);
750 extent_end = key.offset +
751 btrfs_file_extent_num_bytes(leaf, fi);
752 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
753 extent_end = key.offset +
754 btrfs_file_extent_inline_len(leaf, fi);
Chris Mason8c2383c2007-06-18 09:57:58 -0400755 } else {
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000756 WARN_ON(1);
Chris Mason8c2383c2007-06-18 09:57:58 -0400757 extent_end = search_start;
Chris Mason39279cc2007-06-12 06:35:45 -0400758 }
759
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000760 if (extent_end <= search_start) {
761 path->slots[0]++;
Chris Mason8c2383c2007-06-18 09:57:58 -0400762 goto next_slot;
Chris Mason39279cc2007-06-12 06:35:45 -0400763 }
764
Josef Bacikc3308f82012-09-14 14:51:22 -0400765 found = 1;
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000766 search_start = max(key.offset, start);
Chris Masondc7fdde2012-04-27 14:31:29 -0400767 if (recow || !modify_tree) {
768 modify_tree = -1;
David Sterbab3b4aa72011-04-21 01:20:15 +0200769 btrfs_release_path(path);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000770 continue;
Chris Mason39279cc2007-06-12 06:35:45 -0400771 }
Chris Mason771ed682008-11-06 22:02:51 -0500772
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000773 /*
774 * | - range to drop - |
775 * | -------- extent -------- |
776 */
777 if (start > key.offset && end < extent_end) {
778 BUG_ON(del_nr > 0);
779 BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
780
781 memcpy(&new_key, &key, sizeof(new_key));
782 new_key.offset = start;
783 ret = btrfs_duplicate_item(trans, root, path,
784 &new_key);
785 if (ret == -EAGAIN) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200786 btrfs_release_path(path);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000787 continue;
788 }
789 if (ret < 0)
790 break;
Chris Mason8c2383c2007-06-18 09:57:58 -0400791
Chris Mason5f39d392007-10-15 16:14:19 -0400792 leaf = path->nodes[0];
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000793 fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
794 struct btrfs_file_extent_item);
795 btrfs_set_file_extent_num_bytes(leaf, fi,
796 start - key.offset);
Chris Mason39279cc2007-06-12 06:35:45 -0400797
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000798 fi = btrfs_item_ptr(leaf, path->slots[0],
799 struct btrfs_file_extent_item);
Chris Masonc8b97812008-10-29 14:49:59 -0400800
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000801 extent_offset += start - key.offset;
802 btrfs_set_file_extent_offset(leaf, fi, extent_offset);
803 btrfs_set_file_extent_num_bytes(leaf, fi,
804 extent_end - start);
805 btrfs_mark_buffer_dirty(leaf);
Chris Masondb945352007-10-15 16:15:53 -0400806
Josef Bacik5dc562c2012-08-17 13:14:17 -0400807 if (update_refs && disk_bytenr > 0) {
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000808 ret = btrfs_inc_extent_ref(trans, root,
809 disk_bytenr, num_bytes, 0,
810 root->root_key.objectid,
811 new_key.objectid,
Arne Jansen66d7e7f2011-09-12 15:26:38 +0200812 start - extent_offset, 0);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100813 BUG_ON(ret); /* -ENOMEM */
Zheng Yan31840ae2008-09-23 13:14:14 -0400814 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000815 key.offset = start;
816 }
817 /*
818 * | ---- range to drop ----- |
819 * | -------- extent -------- |
820 */
821 if (start <= key.offset && end < extent_end) {
822 BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
823
824 memcpy(&new_key, &key, sizeof(new_key));
825 new_key.offset = end;
826 btrfs_set_item_key_safe(trans, root, path, &new_key);
827
828 extent_offset += end - key.offset;
829 btrfs_set_file_extent_offset(leaf, fi, extent_offset);
830 btrfs_set_file_extent_num_bytes(leaf, fi,
831 extent_end - end);
832 btrfs_mark_buffer_dirty(leaf);
Josef Bacik26714852012-08-29 12:24:27 -0400833 if (update_refs && disk_bytenr > 0)
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000834 inode_sub_bytes(inode, end - key.offset);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000835 break;
Zheng Yan31840ae2008-09-23 13:14:14 -0400836 }
837
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000838 search_start = extent_end;
839 /*
840 * | ---- range to drop ----- |
841 * | -------- extent -------- |
842 */
843 if (start > key.offset && end >= extent_end) {
844 BUG_ON(del_nr > 0);
845 BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
846
847 btrfs_set_file_extent_num_bytes(leaf, fi,
848 start - key.offset);
849 btrfs_mark_buffer_dirty(leaf);
Josef Bacik26714852012-08-29 12:24:27 -0400850 if (update_refs && disk_bytenr > 0)
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000851 inode_sub_bytes(inode, extent_end - start);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000852 if (end == extent_end)
853 break;
854
855 path->slots[0]++;
856 goto next_slot;
Chris Mason39279cc2007-06-12 06:35:45 -0400857 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000858
859 /*
860 * | ---- range to drop ----- |
861 * | ------ extent ------ |
862 */
863 if (start <= key.offset && end >= extent_end) {
864 if (del_nr == 0) {
865 del_slot = path->slots[0];
866 del_nr = 1;
867 } else {
868 BUG_ON(del_slot + del_nr != path->slots[0]);
869 del_nr++;
870 }
871
Josef Bacik5dc562c2012-08-17 13:14:17 -0400872 if (update_refs &&
873 extent_type == BTRFS_FILE_EXTENT_INLINE) {
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000874 inode_sub_bytes(inode,
875 extent_end - key.offset);
876 extent_end = ALIGN(extent_end,
877 root->sectorsize);
Josef Bacik5dc562c2012-08-17 13:14:17 -0400878 } else if (update_refs && disk_bytenr > 0) {
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000879 ret = btrfs_free_extent(trans, root,
880 disk_bytenr, num_bytes, 0,
881 root->root_key.objectid,
882 key.objectid, key.offset -
Arne Jansen66d7e7f2011-09-12 15:26:38 +0200883 extent_offset, 0);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100884 BUG_ON(ret); /* -ENOMEM */
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000885 inode_sub_bytes(inode,
886 extent_end - key.offset);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000887 }
888
889 if (end == extent_end)
890 break;
891
892 if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) {
893 path->slots[0]++;
894 goto next_slot;
895 }
896
897 ret = btrfs_del_items(trans, root, path, del_slot,
898 del_nr);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100899 if (ret) {
900 btrfs_abort_transaction(trans, root, ret);
Josef Bacik5dc562c2012-08-17 13:14:17 -0400901 break;
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100902 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000903
904 del_nr = 0;
905 del_slot = 0;
906
David Sterbab3b4aa72011-04-21 01:20:15 +0200907 btrfs_release_path(path);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000908 continue;
909 }
910
911 BUG_ON(1);
Chris Mason39279cc2007-06-12 06:35:45 -0400912 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000913
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100914 if (!ret && del_nr > 0) {
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000915 ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100916 if (ret)
917 btrfs_abort_transaction(trans, root, ret);
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000918 }
919
Josef Bacik2aaa6652012-08-29 14:27:18 -0400920 if (drop_end)
Josef Bacikc3308f82012-09-14 14:51:22 -0400921 *drop_end = found ? min(end, extent_end) : end;
Josef Bacik5dc562c2012-08-17 13:14:17 -0400922 btrfs_release_path(path);
923 return ret;
924}
925
926int btrfs_drop_extents(struct btrfs_trans_handle *trans,
927 struct btrfs_root *root, struct inode *inode, u64 start,
Josef Bacik26714852012-08-29 12:24:27 -0400928 u64 end, int drop_cache)
Josef Bacik5dc562c2012-08-17 13:14:17 -0400929{
930 struct btrfs_path *path;
931 int ret;
932
933 path = btrfs_alloc_path();
934 if (!path)
935 return -ENOMEM;
Josef Bacik2aaa6652012-08-29 14:27:18 -0400936 ret = __btrfs_drop_extents(trans, root, inode, path, start, end, NULL,
Josef Bacik26714852012-08-29 12:24:27 -0400937 drop_cache);
Chris Mason39279cc2007-06-12 06:35:45 -0400938 btrfs_free_path(path);
939 return ret;
940}
941
Yan Zhengd899e052008-10-30 14:25:28 -0400942static int extent_mergeable(struct extent_buffer *leaf, int slot,
Yan, Zheng6c7d54a2010-01-15 08:43:09 +0000943 u64 objectid, u64 bytenr, u64 orig_offset,
944 u64 *start, u64 *end)
Yan Zhengd899e052008-10-30 14:25:28 -0400945{
946 struct btrfs_file_extent_item *fi;
947 struct btrfs_key key;
948 u64 extent_end;
949
950 if (slot < 0 || slot >= btrfs_header_nritems(leaf))
951 return 0;
952
953 btrfs_item_key_to_cpu(leaf, &key, slot);
954 if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY)
955 return 0;
956
957 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
958 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG ||
959 btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr ||
Yan, Zheng6c7d54a2010-01-15 08:43:09 +0000960 btrfs_file_extent_offset(leaf, fi) != key.offset - orig_offset ||
Yan Zhengd899e052008-10-30 14:25:28 -0400961 btrfs_file_extent_compression(leaf, fi) ||
962 btrfs_file_extent_encryption(leaf, fi) ||
963 btrfs_file_extent_other_encoding(leaf, fi))
964 return 0;
965
966 extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
967 if ((*start && *start != key.offset) || (*end && *end != extent_end))
968 return 0;
969
970 *start = key.offset;
971 *end = extent_end;
972 return 1;
973}
974
975/*
976 * Mark extent in the range start - end as written.
977 *
978 * This changes extent type from 'pre-allocated' to 'regular'. If only
979 * part of extent is marked as written, the extent will be split into
980 * two or three.
981 */
982int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
Yan Zhengd899e052008-10-30 14:25:28 -0400983 struct inode *inode, u64 start, u64 end)
984{
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000985 struct btrfs_root *root = BTRFS_I(inode)->root;
Yan Zhengd899e052008-10-30 14:25:28 -0400986 struct extent_buffer *leaf;
987 struct btrfs_path *path;
988 struct btrfs_file_extent_item *fi;
989 struct btrfs_key key;
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000990 struct btrfs_key new_key;
Yan Zhengd899e052008-10-30 14:25:28 -0400991 u64 bytenr;
992 u64 num_bytes;
993 u64 extent_end;
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400994 u64 orig_offset;
Yan Zhengd899e052008-10-30 14:25:28 -0400995 u64 other_start;
996 u64 other_end;
Yan, Zheng920bbbf2009-11-12 09:34:08 +0000997 u64 split;
998 int del_nr = 0;
999 int del_slot = 0;
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001000 int recow;
Yan Zhengd899e052008-10-30 14:25:28 -04001001 int ret;
Li Zefan33345d012011-04-20 10:31:50 +08001002 u64 ino = btrfs_ino(inode);
Yan Zhengd899e052008-10-30 14:25:28 -04001003
Yan Zhengd899e052008-10-30 14:25:28 -04001004 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -07001005 if (!path)
1006 return -ENOMEM;
Yan Zhengd899e052008-10-30 14:25:28 -04001007again:
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001008 recow = 0;
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001009 split = start;
Li Zefan33345d012011-04-20 10:31:50 +08001010 key.objectid = ino;
Yan Zhengd899e052008-10-30 14:25:28 -04001011 key.type = BTRFS_EXTENT_DATA_KEY;
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001012 key.offset = split;
Yan Zhengd899e052008-10-30 14:25:28 -04001013
1014 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
Josef Bacik41415732011-03-16 13:59:32 -04001015 if (ret < 0)
1016 goto out;
Yan Zhengd899e052008-10-30 14:25:28 -04001017 if (ret > 0 && path->slots[0] > 0)
1018 path->slots[0]--;
1019
1020 leaf = path->nodes[0];
1021 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
Li Zefan33345d012011-04-20 10:31:50 +08001022 BUG_ON(key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY);
Yan Zhengd899e052008-10-30 14:25:28 -04001023 fi = btrfs_item_ptr(leaf, path->slots[0],
1024 struct btrfs_file_extent_item);
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001025 BUG_ON(btrfs_file_extent_type(leaf, fi) !=
1026 BTRFS_FILE_EXTENT_PREALLOC);
Yan Zhengd899e052008-10-30 14:25:28 -04001027 extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
1028 BUG_ON(key.offset > start || extent_end < end);
1029
1030 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
1031 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
Yan Zheng5d4f98a2009-06-10 10:45:14 -04001032 orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001033 memcpy(&new_key, &key, sizeof(new_key));
1034
1035 if (start == key.offset && end < extent_end) {
1036 other_start = 0;
1037 other_end = start;
1038 if (extent_mergeable(leaf, path->slots[0] - 1,
Li Zefan33345d012011-04-20 10:31:50 +08001039 ino, bytenr, orig_offset,
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001040 &other_start, &other_end)) {
1041 new_key.offset = end;
1042 btrfs_set_item_key_safe(trans, root, path, &new_key);
1043 fi = btrfs_item_ptr(leaf, path->slots[0],
1044 struct btrfs_file_extent_item);
Josef Bacik224ecce2012-08-16 16:32:06 -04001045 btrfs_set_file_extent_generation(leaf, fi,
1046 trans->transid);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001047 btrfs_set_file_extent_num_bytes(leaf, fi,
1048 extent_end - end);
1049 btrfs_set_file_extent_offset(leaf, fi,
1050 end - orig_offset);
1051 fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
1052 struct btrfs_file_extent_item);
Josef Bacik224ecce2012-08-16 16:32:06 -04001053 btrfs_set_file_extent_generation(leaf, fi,
1054 trans->transid);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001055 btrfs_set_file_extent_num_bytes(leaf, fi,
1056 end - other_start);
1057 btrfs_mark_buffer_dirty(leaf);
1058 goto out;
1059 }
1060 }
1061
1062 if (start > key.offset && end == extent_end) {
1063 other_start = end;
1064 other_end = 0;
1065 if (extent_mergeable(leaf, path->slots[0] + 1,
Li Zefan33345d012011-04-20 10:31:50 +08001066 ino, bytenr, orig_offset,
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001067 &other_start, &other_end)) {
1068 fi = btrfs_item_ptr(leaf, path->slots[0],
1069 struct btrfs_file_extent_item);
1070 btrfs_set_file_extent_num_bytes(leaf, fi,
1071 start - key.offset);
Josef Bacik224ecce2012-08-16 16:32:06 -04001072 btrfs_set_file_extent_generation(leaf, fi,
1073 trans->transid);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001074 path->slots[0]++;
1075 new_key.offset = start;
1076 btrfs_set_item_key_safe(trans, root, path, &new_key);
1077
1078 fi = btrfs_item_ptr(leaf, path->slots[0],
1079 struct btrfs_file_extent_item);
Josef Bacik224ecce2012-08-16 16:32:06 -04001080 btrfs_set_file_extent_generation(leaf, fi,
1081 trans->transid);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001082 btrfs_set_file_extent_num_bytes(leaf, fi,
1083 other_end - start);
1084 btrfs_set_file_extent_offset(leaf, fi,
1085 start - orig_offset);
1086 btrfs_mark_buffer_dirty(leaf);
1087 goto out;
1088 }
1089 }
Yan Zhengd899e052008-10-30 14:25:28 -04001090
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001091 while (start > key.offset || end < extent_end) {
1092 if (key.offset == start)
1093 split = end;
Yan Zhengd899e052008-10-30 14:25:28 -04001094
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001095 new_key.offset = split;
1096 ret = btrfs_duplicate_item(trans, root, path, &new_key);
1097 if (ret == -EAGAIN) {
David Sterbab3b4aa72011-04-21 01:20:15 +02001098 btrfs_release_path(path);
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001099 goto again;
Yan Zhengd899e052008-10-30 14:25:28 -04001100 }
Jeff Mahoney79787ea2012-03-12 16:03:00 +01001101 if (ret < 0) {
1102 btrfs_abort_transaction(trans, root, ret);
1103 goto out;
1104 }
Yan Zhengd899e052008-10-30 14:25:28 -04001105
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001106 leaf = path->nodes[0];
1107 fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
Yan Zhengd899e052008-10-30 14:25:28 -04001108 struct btrfs_file_extent_item);
Josef Bacik224ecce2012-08-16 16:32:06 -04001109 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
Yan Zhengd899e052008-10-30 14:25:28 -04001110 btrfs_set_file_extent_num_bytes(leaf, fi,
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001111 split - key.offset);
1112
1113 fi = btrfs_item_ptr(leaf, path->slots[0],
1114 struct btrfs_file_extent_item);
1115
Josef Bacik224ecce2012-08-16 16:32:06 -04001116 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001117 btrfs_set_file_extent_offset(leaf, fi, split - orig_offset);
1118 btrfs_set_file_extent_num_bytes(leaf, fi,
1119 extent_end - split);
Yan Zhengd899e052008-10-30 14:25:28 -04001120 btrfs_mark_buffer_dirty(leaf);
1121
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001122 ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
1123 root->root_key.objectid,
Arne Jansen66d7e7f2011-09-12 15:26:38 +02001124 ino, orig_offset, 0);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01001125 BUG_ON(ret); /* -ENOMEM */
Yan Zhengd899e052008-10-30 14:25:28 -04001126
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001127 if (split == start) {
1128 key.offset = start;
1129 } else {
1130 BUG_ON(start != key.offset);
Yan Zhengd899e052008-10-30 14:25:28 -04001131 path->slots[0]--;
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001132 extent_end = end;
Yan Zhengd899e052008-10-30 14:25:28 -04001133 }
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001134 recow = 1;
Yan Zhengd899e052008-10-30 14:25:28 -04001135 }
1136
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001137 other_start = end;
1138 other_end = 0;
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001139 if (extent_mergeable(leaf, path->slots[0] + 1,
Li Zefan33345d012011-04-20 10:31:50 +08001140 ino, bytenr, orig_offset,
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001141 &other_start, &other_end)) {
1142 if (recow) {
David Sterbab3b4aa72011-04-21 01:20:15 +02001143 btrfs_release_path(path);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001144 goto again;
1145 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001146 extent_end = other_end;
1147 del_slot = path->slots[0] + 1;
1148 del_nr++;
1149 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
1150 0, root->root_key.objectid,
Arne Jansen66d7e7f2011-09-12 15:26:38 +02001151 ino, orig_offset, 0);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01001152 BUG_ON(ret); /* -ENOMEM */
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001153 }
1154 other_start = 0;
1155 other_end = start;
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001156 if (extent_mergeable(leaf, path->slots[0] - 1,
Li Zefan33345d012011-04-20 10:31:50 +08001157 ino, bytenr, orig_offset,
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001158 &other_start, &other_end)) {
1159 if (recow) {
David Sterbab3b4aa72011-04-21 01:20:15 +02001160 btrfs_release_path(path);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001161 goto again;
1162 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001163 key.offset = other_start;
1164 del_slot = path->slots[0];
1165 del_nr++;
1166 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
1167 0, root->root_key.objectid,
Arne Jansen66d7e7f2011-09-12 15:26:38 +02001168 ino, orig_offset, 0);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01001169 BUG_ON(ret); /* -ENOMEM */
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001170 }
1171 if (del_nr == 0) {
Shaohua Li3f6fae92010-02-11 07:43:00 +00001172 fi = btrfs_item_ptr(leaf, path->slots[0],
1173 struct btrfs_file_extent_item);
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001174 btrfs_set_file_extent_type(leaf, fi,
1175 BTRFS_FILE_EXTENT_REG);
Josef Bacik224ecce2012-08-16 16:32:06 -04001176 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001177 btrfs_mark_buffer_dirty(leaf);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001178 } else {
Shaohua Li3f6fae92010-02-11 07:43:00 +00001179 fi = btrfs_item_ptr(leaf, del_slot - 1,
1180 struct btrfs_file_extent_item);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001181 btrfs_set_file_extent_type(leaf, fi,
1182 BTRFS_FILE_EXTENT_REG);
Josef Bacik224ecce2012-08-16 16:32:06 -04001183 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
Yan, Zheng6c7d54a2010-01-15 08:43:09 +00001184 btrfs_set_file_extent_num_bytes(leaf, fi,
1185 extent_end - key.offset);
1186 btrfs_mark_buffer_dirty(leaf);
1187
1188 ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01001189 if (ret < 0) {
1190 btrfs_abort_transaction(trans, root, ret);
1191 goto out;
1192 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001193 }
Yan, Zheng920bbbf2009-11-12 09:34:08 +00001194out:
Yan Zhengd899e052008-10-30 14:25:28 -04001195 btrfs_free_path(path);
1196 return 0;
1197}
1198
Chris Mason39279cc2007-06-12 06:35:45 -04001199/*
Chris Masonb1bf8622011-02-28 09:52:08 -05001200 * on error we return an unlocked page and the error value
1201 * on success we return a locked page and 0
1202 */
Josef Bacikb63164292011-09-30 15:23:54 -04001203static int prepare_uptodate_page(struct page *page, u64 pos,
1204 bool force_uptodate)
Chris Masonb1bf8622011-02-28 09:52:08 -05001205{
1206 int ret = 0;
1207
Josef Bacikb63164292011-09-30 15:23:54 -04001208 if (((pos & (PAGE_CACHE_SIZE - 1)) || force_uptodate) &&
1209 !PageUptodate(page)) {
Chris Masonb1bf8622011-02-28 09:52:08 -05001210 ret = btrfs_readpage(NULL, page);
1211 if (ret)
1212 return ret;
1213 lock_page(page);
1214 if (!PageUptodate(page)) {
1215 unlock_page(page);
1216 return -EIO;
1217 }
1218 }
1219 return 0;
1220}
1221
1222/*
Chris Masond352ac62008-09-29 15:18:18 -04001223 * this gets pages into the page cache and locks them down, it also properly
1224 * waits for data=ordered extents to finish before allowing the pages to be
1225 * modified.
Chris Mason39279cc2007-06-12 06:35:45 -04001226 */
Chris Masond3977122009-01-05 21:25:51 -05001227static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
Chris Mason98ed5172008-01-03 10:01:48 -05001228 struct page **pages, size_t num_pages,
1229 loff_t pos, unsigned long first_index,
Josef Bacikb63164292011-09-30 15:23:54 -04001230 size_t write_bytes, bool force_uptodate)
Chris Mason39279cc2007-06-12 06:35:45 -04001231{
Josef Bacik2ac55d42010-02-03 19:33:23 +00001232 struct extent_state *cached_state = NULL;
Chris Mason39279cc2007-06-12 06:35:45 -04001233 int i;
1234 unsigned long index = pos >> PAGE_CACHE_SHIFT;
Al Viro496ad9a2013-01-23 17:07:38 -05001235 struct inode *inode = file_inode(file);
Josef Bacik3b16a4e2011-09-21 15:05:58 -04001236 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
Chris Mason39279cc2007-06-12 06:35:45 -04001237 int err = 0;
Chris Masonb1bf8622011-02-28 09:52:08 -05001238 int faili = 0;
Chris Mason8c2383c2007-06-18 09:57:58 -04001239 u64 start_pos;
Chris Masone6dcd2d2008-07-17 12:53:50 -04001240 u64 last_pos;
Chris Mason8c2383c2007-06-18 09:57:58 -04001241
Chris Mason5f39d392007-10-15 16:14:19 -04001242 start_pos = pos & ~((u64)root->sectorsize - 1);
Chris Masone6dcd2d2008-07-17 12:53:50 -04001243 last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;
Chris Mason39279cc2007-06-12 06:35:45 -04001244
Chris Masone6dcd2d2008-07-17 12:53:50 -04001245again:
Chris Mason39279cc2007-06-12 06:35:45 -04001246 for (i = 0; i < num_pages; i++) {
Josef Bacika94733d2011-07-11 10:47:06 -04001247 pages[i] = find_or_create_page(inode->i_mapping, index + i,
Johannes Weinere3a41a52012-01-10 15:07:55 -08001248 mask | __GFP_WRITE);
Chris Mason39279cc2007-06-12 06:35:45 -04001249 if (!pages[i]) {
Chris Masonb1bf8622011-02-28 09:52:08 -05001250 faili = i - 1;
1251 err = -ENOMEM;
1252 goto fail;
1253 }
1254
1255 if (i == 0)
Josef Bacikb63164292011-09-30 15:23:54 -04001256 err = prepare_uptodate_page(pages[i], pos,
1257 force_uptodate);
Chris Masonb1bf8622011-02-28 09:52:08 -05001258 if (i == num_pages - 1)
1259 err = prepare_uptodate_page(pages[i],
Josef Bacikb63164292011-09-30 15:23:54 -04001260 pos + write_bytes, false);
Chris Masonb1bf8622011-02-28 09:52:08 -05001261 if (err) {
1262 page_cache_release(pages[i]);
1263 faili = i - 1;
1264 goto fail;
Chris Mason39279cc2007-06-12 06:35:45 -04001265 }
Chris Masonccd467d2007-06-28 15:57:36 -04001266 wait_on_page_writeback(pages[i]);
Chris Mason39279cc2007-06-12 06:35:45 -04001267 }
Chris Masonb1bf8622011-02-28 09:52:08 -05001268 err = 0;
Chris Mason07627042008-02-19 11:29:24 -05001269 if (start_pos < inode->i_size) {
Chris Masone6dcd2d2008-07-17 12:53:50 -04001270 struct btrfs_ordered_extent *ordered;
Josef Bacik2ac55d42010-02-03 19:33:23 +00001271 lock_extent_bits(&BTRFS_I(inode)->io_tree,
Jeff Mahoneyd0082372012-03-01 14:57:19 +01001272 start_pos, last_pos - 1, 0, &cached_state);
Chris Masond3977122009-01-05 21:25:51 -05001273 ordered = btrfs_lookup_first_ordered_extent(inode,
1274 last_pos - 1);
Chris Masone6dcd2d2008-07-17 12:53:50 -04001275 if (ordered &&
1276 ordered->file_offset + ordered->len > start_pos &&
1277 ordered->file_offset < last_pos) {
1278 btrfs_put_ordered_extent(ordered);
Josef Bacik2ac55d42010-02-03 19:33:23 +00001279 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1280 start_pos, last_pos - 1,
1281 &cached_state, GFP_NOFS);
Chris Masone6dcd2d2008-07-17 12:53:50 -04001282 for (i = 0; i < num_pages; i++) {
1283 unlock_page(pages[i]);
1284 page_cache_release(pages[i]);
1285 }
1286 btrfs_wait_ordered_range(inode, start_pos,
1287 last_pos - start_pos);
1288 goto again;
1289 }
1290 if (ordered)
1291 btrfs_put_ordered_extent(ordered);
1292
Josef Bacik2ac55d42010-02-03 19:33:23 +00001293 clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos,
Josef Bacik32c00af2009-10-08 13:34:05 -04001294 last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
Liu Bo9e8a4a82012-09-05 19:10:51 -06001295 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG,
1296 0, 0, &cached_state, GFP_NOFS);
Josef Bacik2ac55d42010-02-03 19:33:23 +00001297 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1298 start_pos, last_pos - 1, &cached_state,
1299 GFP_NOFS);
Chris Mason07627042008-02-19 11:29:24 -05001300 }
Chris Masone6dcd2d2008-07-17 12:53:50 -04001301 for (i = 0; i < num_pages; i++) {
Wu Fengguang32c7f202011-08-08 15:19:47 -06001302 if (clear_page_dirty_for_io(pages[i]))
1303 account_page_redirty(pages[i]);
Chris Masone6dcd2d2008-07-17 12:53:50 -04001304 set_page_extent_mapped(pages[i]);
1305 WARN_ON(!PageLocked(pages[i]));
1306 }
Chris Mason39279cc2007-06-12 06:35:45 -04001307 return 0;
Chris Masonb1bf8622011-02-28 09:52:08 -05001308fail:
1309 while (faili >= 0) {
1310 unlock_page(pages[faili]);
1311 page_cache_release(pages[faili]);
1312 faili--;
1313 }
1314 return err;
1315
Chris Mason39279cc2007-06-12 06:35:45 -04001316}
1317
Josef Bacikd0215f32011-01-25 14:57:24 -05001318static noinline ssize_t __btrfs_buffered_write(struct file *file,
1319 struct iov_iter *i,
1320 loff_t pos)
Josef Bacik4b46fce2010-05-23 11:00:55 -04001321{
Al Viro496ad9a2013-01-23 17:07:38 -05001322 struct inode *inode = file_inode(file);
Josef Bacik11c65dc2010-05-23 11:07:21 -04001323 struct btrfs_root *root = BTRFS_I(inode)->root;
Josef Bacik11c65dc2010-05-23 11:07:21 -04001324 struct page **pages = NULL;
Chris Mason39279cc2007-06-12 06:35:45 -04001325 unsigned long first_index;
Josef Bacikd0215f32011-01-25 14:57:24 -05001326 size_t num_written = 0;
1327 int nrptrs;
Tsutomu Itohc9149232011-03-30 00:57:23 +00001328 int ret = 0;
Josef Bacikb63164292011-09-30 15:23:54 -04001329 bool force_page_uptodate = false;
Chris Masoncb843a62008-10-03 12:30:02 -04001330
Josef Bacikd0215f32011-01-25 14:57:24 -05001331 nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) /
Josef Bacik11c65dc2010-05-23 11:07:21 -04001332 PAGE_CACHE_SIZE, PAGE_CACHE_SIZE /
1333 (sizeof(struct page *)));
Wu Fengguang142349f2011-12-16 12:32:57 -05001334 nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied);
1335 nrptrs = max(nrptrs, 8);
Chris Mason8c2383c2007-06-18 09:57:58 -04001336 pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
Josef Bacikd0215f32011-01-25 14:57:24 -05001337 if (!pages)
1338 return -ENOMEM;
Chris Masonab93dbe2009-10-01 12:29:10 -04001339
Chris Mason39279cc2007-06-12 06:35:45 -04001340 first_index = pos >> PAGE_CACHE_SHIFT;
Chris Mason39279cc2007-06-12 06:35:45 -04001341
Josef Bacikd0215f32011-01-25 14:57:24 -05001342 while (iov_iter_count(i) > 0) {
Chris Mason39279cc2007-06-12 06:35:45 -04001343 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
Josef Bacikd0215f32011-01-25 14:57:24 -05001344 size_t write_bytes = min(iov_iter_count(i),
Josef Bacik11c65dc2010-05-23 11:07:21 -04001345 nrptrs * (size_t)PAGE_CACHE_SIZE -
Chris Mason8c2383c2007-06-18 09:57:58 -04001346 offset);
Yan, Zheng3a909832011-01-18 13:34:40 +08001347 size_t num_pages = (write_bytes + offset +
1348 PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
Josef Bacikd0215f32011-01-25 14:57:24 -05001349 size_t dirty_pages;
1350 size_t copied;
Chris Mason39279cc2007-06-12 06:35:45 -04001351
Chris Mason8c2383c2007-06-18 09:57:58 -04001352 WARN_ON(num_pages > nrptrs);
Chris Mason1832a6d2007-12-21 16:27:21 -05001353
Xin Zhong914ee292010-12-09 09:30:14 +00001354 /*
1355 * Fault pages before locking them in prepare_pages
1356 * to avoid recursive lock
1357 */
Josef Bacikd0215f32011-01-25 14:57:24 -05001358 if (unlikely(iov_iter_fault_in_readable(i, write_bytes))) {
Xin Zhong914ee292010-12-09 09:30:14 +00001359 ret = -EFAULT;
Josef Bacikd0215f32011-01-25 14:57:24 -05001360 break;
Xin Zhong914ee292010-12-09 09:30:14 +00001361 }
1362
1363 ret = btrfs_delalloc_reserve_space(inode,
1364 num_pages << PAGE_CACHE_SHIFT);
Chris Mason1832a6d2007-12-21 16:27:21 -05001365 if (ret)
Josef Bacikd0215f32011-01-25 14:57:24 -05001366 break;
Chris Mason1832a6d2007-12-21 16:27:21 -05001367
Josef Bacik4a640012011-01-25 15:10:08 -05001368 /*
1369 * This is going to setup the pages array with the number of
1370 * pages we want, so we don't really need to worry about the
1371 * contents of pages from loop to loop
1372 */
Chris Mason39279cc2007-06-12 06:35:45 -04001373 ret = prepare_pages(root, file, pages, num_pages,
Josef Bacikb63164292011-09-30 15:23:54 -04001374 pos, first_index, write_bytes,
1375 force_page_uptodate);
Josef Bacik6a632092009-02-20 11:00:09 -05001376 if (ret) {
Xin Zhong914ee292010-12-09 09:30:14 +00001377 btrfs_delalloc_release_space(inode,
1378 num_pages << PAGE_CACHE_SHIFT);
Josef Bacikd0215f32011-01-25 14:57:24 -05001379 break;
Josef Bacik6a632092009-02-20 11:00:09 -05001380 }
Chris Mason39279cc2007-06-12 06:35:45 -04001381
Xin Zhong914ee292010-12-09 09:30:14 +00001382 copied = btrfs_copy_from_user(pos, num_pages,
Josef Bacikd0215f32011-01-25 14:57:24 -05001383 write_bytes, pages, i);
Chris Masonb1bf8622011-02-28 09:52:08 -05001384
1385 /*
1386 * if we have trouble faulting in the pages, fall
1387 * back to one page at a time
1388 */
1389 if (copied < write_bytes)
1390 nrptrs = 1;
1391
Josef Bacikb63164292011-09-30 15:23:54 -04001392 if (copied == 0) {
1393 force_page_uptodate = true;
Chris Masonb1bf8622011-02-28 09:52:08 -05001394 dirty_pages = 0;
Josef Bacikb63164292011-09-30 15:23:54 -04001395 } else {
1396 force_page_uptodate = false;
Chris Masonb1bf8622011-02-28 09:52:08 -05001397 dirty_pages = (copied + offset +
1398 PAGE_CACHE_SIZE - 1) >>
1399 PAGE_CACHE_SHIFT;
Josef Bacikb63164292011-09-30 15:23:54 -04001400 }
Xin Zhong914ee292010-12-09 09:30:14 +00001401
Josef Bacikd0215f32011-01-25 14:57:24 -05001402 /*
1403 * If we had a short copy we need to release the excess delaloc
1404 * bytes we reserved. We need to increment outstanding_extents
1405 * because btrfs_delalloc_release_space will decrement it, but
1406 * we still have an outstanding extent for the chunk we actually
1407 * managed to copy.
1408 */
Xin Zhong914ee292010-12-09 09:30:14 +00001409 if (num_pages > dirty_pages) {
Josef Bacik9e0baf62011-07-15 15:16:44 +00001410 if (copied > 0) {
1411 spin_lock(&BTRFS_I(inode)->lock);
1412 BTRFS_I(inode)->outstanding_extents++;
1413 spin_unlock(&BTRFS_I(inode)->lock);
1414 }
Xin Zhong914ee292010-12-09 09:30:14 +00001415 btrfs_delalloc_release_space(inode,
1416 (num_pages - dirty_pages) <<
1417 PAGE_CACHE_SHIFT);
1418 }
1419
1420 if (copied > 0) {
Josef Bacikbe1a12a2011-04-06 13:05:22 -04001421 ret = btrfs_dirty_pages(root, inode, pages,
1422 dirty_pages, pos, copied,
1423 NULL);
Josef Bacikd0215f32011-01-25 14:57:24 -05001424 if (ret) {
1425 btrfs_delalloc_release_space(inode,
1426 dirty_pages << PAGE_CACHE_SHIFT);
1427 btrfs_drop_pages(pages, num_pages);
1428 break;
1429 }
Chris Mason54aa1f42007-06-22 14:16:25 -04001430 }
Chris Mason39279cc2007-06-12 06:35:45 -04001431
Chris Mason39279cc2007-06-12 06:35:45 -04001432 btrfs_drop_pages(pages, num_pages);
Xin Zhong914ee292010-12-09 09:30:14 +00001433
Josef Bacikd0215f32011-01-25 14:57:24 -05001434 cond_resched();
1435
Namjae Jeond0e1d662012-12-11 16:00:21 -08001436 balance_dirty_pages_ratelimited(inode->i_mapping);
Josef Bacikd0215f32011-01-25 14:57:24 -05001437 if (dirty_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
Liu Bob53d3f52012-11-14 14:34:34 +00001438 btrfs_btree_balance_dirty(root);
Chris Mason39279cc2007-06-12 06:35:45 -04001439
Xin Zhong914ee292010-12-09 09:30:14 +00001440 pos += copied;
1441 num_written += copied;
Chris Mason39279cc2007-06-12 06:35:45 -04001442 }
Chris Mason5b92ee72008-01-03 13:46:11 -05001443
Chris Mason8c2383c2007-06-18 09:57:58 -04001444 kfree(pages);
Josef Bacikd0215f32011-01-25 14:57:24 -05001445
1446 return num_written ? num_written : ret;
1447}
1448
1449static ssize_t __btrfs_direct_write(struct kiocb *iocb,
1450 const struct iovec *iov,
1451 unsigned long nr_segs, loff_t pos,
1452 loff_t *ppos, size_t count, size_t ocount)
1453{
1454 struct file *file = iocb->ki_filp;
Josef Bacikd0215f32011-01-25 14:57:24 -05001455 struct iov_iter i;
1456 ssize_t written;
1457 ssize_t written_buffered;
1458 loff_t endbyte;
1459 int err;
1460
1461 written = generic_file_direct_write(iocb, iov, &nr_segs, pos, ppos,
1462 count, ocount);
1463
Josef Bacikd0215f32011-01-25 14:57:24 -05001464 if (written < 0 || written == count)
1465 return written;
1466
1467 pos += written;
1468 count -= written;
1469 iov_iter_init(&i, iov, nr_segs, count, written);
1470 written_buffered = __btrfs_buffered_write(file, &i, pos);
1471 if (written_buffered < 0) {
1472 err = written_buffered;
1473 goto out;
1474 }
1475 endbyte = pos + written_buffered - 1;
1476 err = filemap_write_and_wait_range(file->f_mapping, pos, endbyte);
1477 if (err)
1478 goto out;
1479 written += written_buffered;
1480 *ppos = pos + written_buffered;
1481 invalidate_mapping_pages(file->f_mapping, pos >> PAGE_CACHE_SHIFT,
1482 endbyte >> PAGE_CACHE_SHIFT);
1483out:
1484 return written ? written : err;
1485}
1486
Josef Bacik6c760c02012-11-09 10:53:21 -05001487static void update_time_for_write(struct inode *inode)
1488{
1489 struct timespec now;
1490
1491 if (IS_NOCMTIME(inode))
1492 return;
1493
1494 now = current_fs_time(inode->i_sb);
1495 if (!timespec_equal(&inode->i_mtime, &now))
1496 inode->i_mtime = now;
1497
1498 if (!timespec_equal(&inode->i_ctime, &now))
1499 inode->i_ctime = now;
1500
1501 if (IS_I_VERSION(inode))
1502 inode_inc_iversion(inode);
1503}
1504
Josef Bacikd0215f32011-01-25 14:57:24 -05001505static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
1506 const struct iovec *iov,
1507 unsigned long nr_segs, loff_t pos)
1508{
1509 struct file *file = iocb->ki_filp;
Al Viro496ad9a2013-01-23 17:07:38 -05001510 struct inode *inode = file_inode(file);
Josef Bacikd0215f32011-01-25 14:57:24 -05001511 struct btrfs_root *root = BTRFS_I(inode)->root;
1512 loff_t *ppos = &iocb->ki_pos;
Miao Xie0c1a98c2011-09-11 10:52:24 -04001513 u64 start_pos;
Josef Bacikd0215f32011-01-25 14:57:24 -05001514 ssize_t num_written = 0;
1515 ssize_t err = 0;
1516 size_t count, ocount;
Josef Bacikb812ce22012-11-16 13:56:32 -05001517 bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host);
Josef Bacikd0215f32011-01-25 14:57:24 -05001518
Jan Karab2b5ef52012-06-12 16:20:45 +02001519 sb_start_write(inode->i_sb);
Josef Bacikd0215f32011-01-25 14:57:24 -05001520
1521 mutex_lock(&inode->i_mutex);
1522
1523 err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
1524 if (err) {
1525 mutex_unlock(&inode->i_mutex);
1526 goto out;
1527 }
1528 count = ocount;
1529
1530 current->backing_dev_info = inode->i_mapping->backing_dev_info;
1531 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
1532 if (err) {
1533 mutex_unlock(&inode->i_mutex);
1534 goto out;
1535 }
1536
1537 if (count == 0) {
1538 mutex_unlock(&inode->i_mutex);
1539 goto out;
1540 }
1541
1542 err = file_remove_suid(file);
1543 if (err) {
1544 mutex_unlock(&inode->i_mutex);
1545 goto out;
1546 }
1547
1548 /*
1549 * If BTRFS flips readonly due to some impossible error
1550 * (fs_info->fs_state now has BTRFS_SUPER_FLAG_ERROR),
1551 * although we have opened a file as writable, we have
1552 * to stop this write operation to ensure FS consistency.
1553 */
Miao Xie87533c42013-01-29 10:14:48 +00001554 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) {
Josef Bacikd0215f32011-01-25 14:57:24 -05001555 mutex_unlock(&inode->i_mutex);
1556 err = -EROFS;
1557 goto out;
1558 }
1559
Josef Bacik6c760c02012-11-09 10:53:21 -05001560 /*
1561 * We reserve space for updating the inode when we reserve space for the
1562 * extent we are going to write, so we will enospc out there. We don't
1563 * need to start yet another transaction to update the inode as we will
1564 * update the inode when we finish writing whatever data we write.
1565 */
1566 update_time_for_write(inode);
Josef Bacikd0215f32011-01-25 14:57:24 -05001567
Miao Xie0c1a98c2011-09-11 10:52:24 -04001568 start_pos = round_down(pos, root->sectorsize);
1569 if (start_pos > i_size_read(inode)) {
1570 err = btrfs_cont_expand(inode, i_size_read(inode), start_pos);
1571 if (err) {
1572 mutex_unlock(&inode->i_mutex);
1573 goto out;
1574 }
1575 }
1576
Josef Bacikb812ce22012-11-16 13:56:32 -05001577 if (sync)
1578 atomic_inc(&BTRFS_I(inode)->sync_writers);
1579
Josef Bacikd0215f32011-01-25 14:57:24 -05001580 if (unlikely(file->f_flags & O_DIRECT)) {
1581 num_written = __btrfs_direct_write(iocb, iov, nr_segs,
1582 pos, ppos, count, ocount);
1583 } else {
1584 struct iov_iter i;
1585
1586 iov_iter_init(&i, iov, nr_segs, count, num_written);
1587
1588 num_written = __btrfs_buffered_write(file, &i, pos);
1589 if (num_written > 0)
1590 *ppos = pos + num_written;
1591 }
1592
1593 mutex_unlock(&inode->i_mutex);
Chris Mason2ff3e9b2007-10-29 14:36:41 -04001594
Chris Mason5a3f23d2009-03-31 13:27:11 -04001595 /*
1596 * we want to make sure fsync finds this change
1597 * but we haven't joined a transaction running right now.
1598 *
1599 * Later on, someone is sure to update the inode and get the
1600 * real transid recorded.
1601 *
1602 * We set last_trans now to the fs_info generation + 1,
1603 * this will either be one more than the running transaction
1604 * or the generation used for the next transaction if there isn't
1605 * one running right now.
Josef Bacik6c760c02012-11-09 10:53:21 -05001606 *
1607 * We also have to set last_sub_trans to the current log transid,
1608 * otherwise subsequent syncs to a file that's been synced in this
1609 * transaction will appear to have already occured.
Chris Mason5a3f23d2009-03-31 13:27:11 -04001610 */
1611 BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
Josef Bacik6c760c02012-11-09 10:53:21 -05001612 BTRFS_I(inode)->last_sub_trans = root->log_transid;
Josef Bacikd0215f32011-01-25 14:57:24 -05001613 if (num_written > 0 || num_written == -EIOCBQUEUED) {
1614 err = generic_write_sync(file, pos, num_written);
1615 if (err < 0 && num_written > 0)
Chris Mason2ff3e9b2007-10-29 14:36:41 -04001616 num_written = err;
1617 }
Miao Xie0a3404d2013-01-28 12:34:55 +00001618
Josef Bacikb812ce22012-11-16 13:56:32 -05001619 if (sync)
1620 atomic_dec(&BTRFS_I(inode)->sync_writers);
Miao Xie0a3404d2013-01-28 12:34:55 +00001621out:
Jan Karab2b5ef52012-06-12 16:20:45 +02001622 sb_end_write(inode->i_sb);
Chris Mason39279cc2007-06-12 06:35:45 -04001623 current->backing_dev_info = NULL;
Chris Mason39279cc2007-06-12 06:35:45 -04001624 return num_written ? num_written : err;
1625}
1626
Chris Masond3977122009-01-05 21:25:51 -05001627int btrfs_release_file(struct inode *inode, struct file *filp)
Mingminge1b81e62008-05-27 10:55:43 -04001628{
Chris Mason5a3f23d2009-03-31 13:27:11 -04001629 /*
1630 * ordered_data_close is set by settattr when we are about to truncate
1631 * a file from a non-zero size to a zero size. This tries to
1632 * flush down new bytes that may have been written if the
1633 * application were using truncate to replace a file in place.
1634 */
Josef Bacik72ac3c02012-05-23 14:13:11 -04001635 if (test_and_clear_bit(BTRFS_INODE_ORDERED_DATA_CLOSE,
1636 &BTRFS_I(inode)->runtime_flags)) {
Josef Bacik569e0f32013-02-13 11:09:14 -05001637 struct btrfs_trans_handle *trans;
1638 struct btrfs_root *root = BTRFS_I(inode)->root;
1639
1640 /*
1641 * We need to block on a committing transaction to keep us from
1642 * throwing a ordered operation on to the list and causing
1643 * something like sync to deadlock trying to flush out this
1644 * inode.
1645 */
1646 trans = btrfs_start_transaction(root, 0);
1647 if (IS_ERR(trans))
1648 return PTR_ERR(trans);
1649 btrfs_add_ordered_operation(trans, BTRFS_I(inode)->root, inode);
1650 btrfs_end_transaction(trans, root);
Chris Mason5a3f23d2009-03-31 13:27:11 -04001651 if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT)
1652 filemap_flush(inode->i_mapping);
1653 }
Sage Weil6bf13c02008-06-10 10:07:39 -04001654 if (filp->private_data)
1655 btrfs_ioctl_trans_end(filp);
Mingminge1b81e62008-05-27 10:55:43 -04001656 return 0;
1657}
1658
Chris Masond352ac62008-09-29 15:18:18 -04001659/*
1660 * fsync call for both files and directories. This logs the inode into
1661 * the tree log instead of forcing full commits whenever possible.
1662 *
1663 * It needs to call filemap_fdatawait so that all ordered extent updates are
1664 * in the metadata btree are up to date for copying to the log.
1665 *
1666 * It drops the inode mutex before doing the tree log commit. This is an
1667 * important optimization for directories because holding the mutex prevents
1668 * new operations on the dir while we write to disk.
1669 */
Josef Bacik02c24a82011-07-16 20:44:56 -04001670int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
Chris Mason39279cc2007-06-12 06:35:45 -04001671{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001672 struct dentry *dentry = file->f_path.dentry;
Chris Mason39279cc2007-06-12 06:35:45 -04001673 struct inode *inode = dentry->d_inode;
1674 struct btrfs_root *root = BTRFS_I(inode)->root;
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001675 int ret = 0;
Chris Mason39279cc2007-06-12 06:35:45 -04001676 struct btrfs_trans_handle *trans;
Josef Bacik2ab28f32012-10-12 15:27:49 -04001677 bool full_sync = 0;
Chris Mason39279cc2007-06-12 06:35:45 -04001678
liubo1abe9b82011-03-24 11:18:59 +00001679 trace_btrfs_sync_file(file, datasync);
Chris Mason257c62e2009-10-13 13:21:08 -04001680
Miao Xie90abccf2012-09-13 04:53:47 -06001681 /*
1682 * We write the dirty pages in the range and wait until they complete
1683 * out of the ->i_mutex. If so, we can flush the dirty pages by
Josef Bacik2ab28f32012-10-12 15:27:49 -04001684 * multi-task, and make the performance up. See
1685 * btrfs_wait_ordered_range for an explanation of the ASYNC check.
Miao Xie90abccf2012-09-13 04:53:47 -06001686 */
Josef Bacikb812ce22012-11-16 13:56:32 -05001687 atomic_inc(&BTRFS_I(inode)->sync_writers);
Josef Bacik2ab28f32012-10-12 15:27:49 -04001688 ret = filemap_fdatawrite_range(inode->i_mapping, start, end);
1689 if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1690 &BTRFS_I(inode)->runtime_flags))
1691 ret = filemap_fdatawrite_range(inode->i_mapping, start, end);
Josef Bacikb812ce22012-11-16 13:56:32 -05001692 atomic_dec(&BTRFS_I(inode)->sync_writers);
Miao Xie90abccf2012-09-13 04:53:47 -06001693 if (ret)
1694 return ret;
1695
Josef Bacik02c24a82011-07-16 20:44:56 -04001696 mutex_lock(&inode->i_mutex);
1697
Josef Bacik0885ef52012-04-23 15:09:39 -04001698 /*
Miao Xie90abccf2012-09-13 04:53:47 -06001699 * We flush the dirty pages again to avoid some dirty pages in the
1700 * range being left.
Josef Bacik0885ef52012-04-23 15:09:39 -04001701 */
Miao Xie2ecb7922012-09-06 04:04:27 -06001702 atomic_inc(&root->log_batch);
Josef Bacik2ab28f32012-10-12 15:27:49 -04001703 full_sync = test_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
1704 &BTRFS_I(inode)->runtime_flags);
1705 if (full_sync)
1706 btrfs_wait_ordered_range(inode, start, end - start + 1);
Miao Xie2ecb7922012-09-06 04:04:27 -06001707 atomic_inc(&root->log_batch);
Chris Mason257c62e2009-10-13 13:21:08 -04001708
Chris Mason39279cc2007-06-12 06:35:45 -04001709 /*
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001710 * check the transaction that last modified this inode
1711 * and see if its already been committed
Chris Mason39279cc2007-06-12 06:35:45 -04001712 */
Josef Bacik02c24a82011-07-16 20:44:56 -04001713 if (!BTRFS_I(inode)->last_trans) {
1714 mutex_unlock(&inode->i_mutex);
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001715 goto out;
Josef Bacik02c24a82011-07-16 20:44:56 -04001716 }
Chris Masona2135012008-06-25 16:01:30 -04001717
Chris Mason257c62e2009-10-13 13:21:08 -04001718 /*
1719 * if the last transaction that changed this file was before
1720 * the current transaction, we can bail out now without any
1721 * syncing
1722 */
Josef Bacika4abeea2011-04-11 17:25:13 -04001723 smp_mb();
Josef Bacik22ee6985d2012-05-29 16:57:49 -04001724 if (btrfs_inode_in_log(inode, root->fs_info->generation) ||
1725 BTRFS_I(inode)->last_trans <=
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001726 root->fs_info->last_trans_committed) {
1727 BTRFS_I(inode)->last_trans = 0;
Josef Bacik5dc562c2012-08-17 13:14:17 -04001728
1729 /*
1730 * We'v had everything committed since the last time we were
1731 * modified so clear this flag in case it was set for whatever
1732 * reason, it's no longer relevant.
1733 */
1734 clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
1735 &BTRFS_I(inode)->runtime_flags);
Josef Bacik02c24a82011-07-16 20:44:56 -04001736 mutex_unlock(&inode->i_mutex);
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001737 goto out;
1738 }
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001739
1740 /*
Chris Masona52d9a82007-08-27 16:49:44 -04001741 * ok we haven't committed the transaction yet, lets do a commit
1742 */
Dan Carpenter6f902af2010-05-29 09:49:07 +00001743 if (file->private_data)
Sage Weil6bf13c02008-06-10 10:07:39 -04001744 btrfs_ioctl_trans_end(file);
1745
Yan, Zhenga22285a2010-05-16 10:48:46 -04001746 trans = btrfs_start_transaction(root, 0);
1747 if (IS_ERR(trans)) {
1748 ret = PTR_ERR(trans);
Josef Bacik02c24a82011-07-16 20:44:56 -04001749 mutex_unlock(&inode->i_mutex);
Chris Mason39279cc2007-06-12 06:35:45 -04001750 goto out;
1751 }
Chris Masone02119d2008-09-05 16:13:11 -04001752
Chris Mason2cfbd502009-02-20 10:55:10 -05001753 ret = btrfs_log_dentry_safe(trans, root, dentry);
Josef Bacik02c24a82011-07-16 20:44:56 -04001754 if (ret < 0) {
1755 mutex_unlock(&inode->i_mutex);
Chris Masone02119d2008-09-05 16:13:11 -04001756 goto out;
Josef Bacik02c24a82011-07-16 20:44:56 -04001757 }
Chris Mason49eb7e42008-09-11 15:53:12 -04001758
1759 /* we've logged all the items and now have a consistent
1760 * version of the file in the log. It is possible that
1761 * someone will come in and modify the file, but that's
1762 * fine because the log is consistent on disk, and we
1763 * have references to all of the file's extents
1764 *
1765 * It is possible that someone will come in and log the
1766 * file again, but that will end up using the synchronization
1767 * inside btrfs_sync_log to keep things safe.
1768 */
Josef Bacik02c24a82011-07-16 20:44:56 -04001769 mutex_unlock(&inode->i_mutex);
Chris Mason49eb7e42008-09-11 15:53:12 -04001770
Chris Mason257c62e2009-10-13 13:21:08 -04001771 if (ret != BTRFS_NO_LOG_SYNC) {
1772 if (ret > 0) {
Josef Bacik2ab28f32012-10-12 15:27:49 -04001773 /*
1774 * If we didn't already wait for ordered extents we need
1775 * to do that now.
1776 */
1777 if (!full_sync)
1778 btrfs_wait_ordered_range(inode, start,
1779 end - start + 1);
Chris Mason12fcfd22009-03-24 10:24:20 -04001780 ret = btrfs_commit_transaction(trans, root);
Chris Mason257c62e2009-10-13 13:21:08 -04001781 } else {
1782 ret = btrfs_sync_log(trans, root);
Josef Bacik2ab28f32012-10-12 15:27:49 -04001783 if (ret == 0) {
Chris Mason257c62e2009-10-13 13:21:08 -04001784 ret = btrfs_end_transaction(trans, root);
Josef Bacik2ab28f32012-10-12 15:27:49 -04001785 } else {
1786 if (!full_sync)
1787 btrfs_wait_ordered_range(inode, start,
1788 end -
1789 start + 1);
Chris Mason257c62e2009-10-13 13:21:08 -04001790 ret = btrfs_commit_transaction(trans, root);
Josef Bacik2ab28f32012-10-12 15:27:49 -04001791 }
Chris Mason257c62e2009-10-13 13:21:08 -04001792 }
1793 } else {
1794 ret = btrfs_end_transaction(trans, root);
Chris Masone02119d2008-09-05 16:13:11 -04001795 }
Chris Mason39279cc2007-06-12 06:35:45 -04001796out:
Roel Kluin014e4ac2010-01-29 10:42:11 +00001797 return ret > 0 ? -EIO : ret;
Chris Mason39279cc2007-06-12 06:35:45 -04001798}
1799
Alexey Dobriyanf0f37e2f2009-09-27 22:29:37 +04001800static const struct vm_operations_struct btrfs_file_vm_ops = {
Chris Mason92fee662007-07-25 12:31:35 -04001801 .fault = filemap_fault,
Chris Mason9ebefb182007-06-15 13:50:00 -04001802 .page_mkwrite = btrfs_page_mkwrite,
Konstantin Khlebnikov0b173bc2012-10-08 16:28:46 -07001803 .remap_pages = generic_file_remap_pages,
Chris Mason9ebefb182007-06-15 13:50:00 -04001804};
1805
1806static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
1807{
Miao Xie058a4572010-05-20 07:21:50 +00001808 struct address_space *mapping = filp->f_mapping;
1809
1810 if (!mapping->a_ops->readpage)
1811 return -ENOEXEC;
1812
Chris Mason9ebefb182007-06-15 13:50:00 -04001813 file_accessed(filp);
Miao Xie058a4572010-05-20 07:21:50 +00001814 vma->vm_ops = &btrfs_file_vm_ops;
Miao Xie058a4572010-05-20 07:21:50 +00001815
Chris Mason9ebefb182007-06-15 13:50:00 -04001816 return 0;
1817}
1818
Josef Bacik2aaa6652012-08-29 14:27:18 -04001819static int hole_mergeable(struct inode *inode, struct extent_buffer *leaf,
1820 int slot, u64 start, u64 end)
1821{
1822 struct btrfs_file_extent_item *fi;
1823 struct btrfs_key key;
1824
1825 if (slot < 0 || slot >= btrfs_header_nritems(leaf))
1826 return 0;
1827
1828 btrfs_item_key_to_cpu(leaf, &key, slot);
1829 if (key.objectid != btrfs_ino(inode) ||
1830 key.type != BTRFS_EXTENT_DATA_KEY)
1831 return 0;
1832
1833 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
1834
1835 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
1836 return 0;
1837
1838 if (btrfs_file_extent_disk_bytenr(leaf, fi))
1839 return 0;
1840
1841 if (key.offset == end)
1842 return 1;
1843 if (key.offset + btrfs_file_extent_num_bytes(leaf, fi) == start)
1844 return 1;
1845 return 0;
1846}
1847
1848static int fill_holes(struct btrfs_trans_handle *trans, struct inode *inode,
1849 struct btrfs_path *path, u64 offset, u64 end)
1850{
1851 struct btrfs_root *root = BTRFS_I(inode)->root;
1852 struct extent_buffer *leaf;
1853 struct btrfs_file_extent_item *fi;
1854 struct extent_map *hole_em;
1855 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1856 struct btrfs_key key;
1857 int ret;
1858
1859 key.objectid = btrfs_ino(inode);
1860 key.type = BTRFS_EXTENT_DATA_KEY;
1861 key.offset = offset;
1862
1863
1864 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
1865 if (ret < 0)
1866 return ret;
1867 BUG_ON(!ret);
1868
1869 leaf = path->nodes[0];
1870 if (hole_mergeable(inode, leaf, path->slots[0]-1, offset, end)) {
1871 u64 num_bytes;
1872
1873 path->slots[0]--;
1874 fi = btrfs_item_ptr(leaf, path->slots[0],
1875 struct btrfs_file_extent_item);
1876 num_bytes = btrfs_file_extent_num_bytes(leaf, fi) +
1877 end - offset;
1878 btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
1879 btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
1880 btrfs_set_file_extent_offset(leaf, fi, 0);
1881 btrfs_mark_buffer_dirty(leaf);
1882 goto out;
1883 }
1884
1885 if (hole_mergeable(inode, leaf, path->slots[0]+1, offset, end)) {
1886 u64 num_bytes;
1887
1888 path->slots[0]++;
1889 key.offset = offset;
1890 btrfs_set_item_key_safe(trans, root, path, &key);
1891 fi = btrfs_item_ptr(leaf, path->slots[0],
1892 struct btrfs_file_extent_item);
1893 num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + end -
1894 offset;
1895 btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
1896 btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
1897 btrfs_set_file_extent_offset(leaf, fi, 0);
1898 btrfs_mark_buffer_dirty(leaf);
1899 goto out;
1900 }
1901 btrfs_release_path(path);
1902
1903 ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset,
1904 0, 0, end - offset, 0, end - offset,
1905 0, 0, 0);
1906 if (ret)
1907 return ret;
1908
1909out:
1910 btrfs_release_path(path);
1911
1912 hole_em = alloc_extent_map();
1913 if (!hole_em) {
1914 btrfs_drop_extent_cache(inode, offset, end - 1, 0);
1915 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
1916 &BTRFS_I(inode)->runtime_flags);
1917 } else {
1918 hole_em->start = offset;
1919 hole_em->len = end - offset;
Josef Bacikcc95bef2013-04-04 14:31:27 -04001920 hole_em->ram_bytes = hole_em->len;
Josef Bacik2aaa6652012-08-29 14:27:18 -04001921 hole_em->orig_start = offset;
1922
1923 hole_em->block_start = EXTENT_MAP_HOLE;
1924 hole_em->block_len = 0;
Josef Bacikb4939682012-12-03 10:31:19 -05001925 hole_em->orig_block_len = 0;
Josef Bacik2aaa6652012-08-29 14:27:18 -04001926 hole_em->bdev = root->fs_info->fs_devices->latest_bdev;
1927 hole_em->compress_type = BTRFS_COMPRESS_NONE;
1928 hole_em->generation = trans->transid;
1929
1930 do {
1931 btrfs_drop_extent_cache(inode, offset, end - 1, 0);
1932 write_lock(&em_tree->lock);
1933 ret = add_extent_mapping(em_tree, hole_em);
1934 if (!ret)
1935 list_move(&hole_em->list,
1936 &em_tree->modified_extents);
1937 write_unlock(&em_tree->lock);
1938 } while (ret == -EEXIST);
1939 free_extent_map(hole_em);
1940 if (ret)
1941 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
1942 &BTRFS_I(inode)->runtime_flags);
1943 }
1944
1945 return 0;
1946}
1947
1948static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
1949{
1950 struct btrfs_root *root = BTRFS_I(inode)->root;
1951 struct extent_state *cached_state = NULL;
1952 struct btrfs_path *path;
1953 struct btrfs_block_rsv *rsv;
1954 struct btrfs_trans_handle *trans;
Miao Xie00612802012-12-05 10:54:12 +00001955 u64 lockstart = round_up(offset, BTRFS_I(inode)->root->sectorsize);
1956 u64 lockend = round_down(offset + len,
1957 BTRFS_I(inode)->root->sectorsize) - 1;
Josef Bacik2aaa6652012-08-29 14:27:18 -04001958 u64 cur_offset = lockstart;
1959 u64 min_size = btrfs_calc_trunc_metadata_size(root, 1);
1960 u64 drop_end;
Josef Bacik2aaa6652012-08-29 14:27:18 -04001961 int ret = 0;
1962 int err = 0;
Miao Xie6347b3c2012-12-05 10:53:45 +00001963 bool same_page = ((offset >> PAGE_CACHE_SHIFT) ==
1964 ((offset + len - 1) >> PAGE_CACHE_SHIFT));
Josef Bacik2aaa6652012-08-29 14:27:18 -04001965
1966 btrfs_wait_ordered_range(inode, offset, len);
1967
1968 mutex_lock(&inode->i_mutex);
Miao Xie7426cc02012-12-05 10:54:52 +00001969 /*
1970 * We needn't truncate any page which is beyond the end of the file
1971 * because we are sure there is no data there.
1972 */
Josef Bacik2aaa6652012-08-29 14:27:18 -04001973 /*
1974 * Only do this if we are in the same page and we aren't doing the
1975 * entire page.
1976 */
1977 if (same_page && len < PAGE_CACHE_SIZE) {
Miao Xie7426cc02012-12-05 10:54:52 +00001978 if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE))
1979 ret = btrfs_truncate_page(inode, offset, len, 0);
Josef Bacik2aaa6652012-08-29 14:27:18 -04001980 mutex_unlock(&inode->i_mutex);
1981 return ret;
1982 }
1983
1984 /* zero back part of the first page */
Miao Xie7426cc02012-12-05 10:54:52 +00001985 if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) {
1986 ret = btrfs_truncate_page(inode, offset, 0, 0);
1987 if (ret) {
1988 mutex_unlock(&inode->i_mutex);
1989 return ret;
1990 }
Josef Bacik2aaa6652012-08-29 14:27:18 -04001991 }
1992
1993 /* zero the front end of the last page */
Miao Xie00612802012-12-05 10:54:12 +00001994 if (offset + len < round_up(inode->i_size, PAGE_CACHE_SIZE)) {
1995 ret = btrfs_truncate_page(inode, offset + len, 0, 1);
1996 if (ret) {
1997 mutex_unlock(&inode->i_mutex);
1998 return ret;
1999 }
Josef Bacik2aaa6652012-08-29 14:27:18 -04002000 }
2001
2002 if (lockend < lockstart) {
2003 mutex_unlock(&inode->i_mutex);
2004 return 0;
2005 }
2006
2007 while (1) {
2008 struct btrfs_ordered_extent *ordered;
2009
2010 truncate_pagecache_range(inode, lockstart, lockend);
2011
2012 lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend,
2013 0, &cached_state);
2014 ordered = btrfs_lookup_first_ordered_extent(inode, lockend);
2015
2016 /*
2017 * We need to make sure we have no ordered extents in this range
2018 * and nobody raced in and read a page in this range, if we did
2019 * we need to try again.
2020 */
2021 if ((!ordered ||
2022 (ordered->file_offset + ordered->len < lockstart ||
2023 ordered->file_offset > lockend)) &&
2024 !test_range_bit(&BTRFS_I(inode)->io_tree, lockstart,
2025 lockend, EXTENT_UPTODATE, 0,
2026 cached_state)) {
2027 if (ordered)
2028 btrfs_put_ordered_extent(ordered);
2029 break;
2030 }
2031 if (ordered)
2032 btrfs_put_ordered_extent(ordered);
2033 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart,
2034 lockend, &cached_state, GFP_NOFS);
2035 btrfs_wait_ordered_range(inode, lockstart,
2036 lockend - lockstart + 1);
2037 }
2038
2039 path = btrfs_alloc_path();
2040 if (!path) {
2041 ret = -ENOMEM;
2042 goto out;
2043 }
2044
Miao Xie66d8f3d2012-09-06 04:02:28 -06002045 rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP);
Josef Bacik2aaa6652012-08-29 14:27:18 -04002046 if (!rsv) {
2047 ret = -ENOMEM;
2048 goto out_free;
2049 }
2050 rsv->size = btrfs_calc_trunc_metadata_size(root, 1);
2051 rsv->failfast = 1;
2052
2053 /*
2054 * 1 - update the inode
2055 * 1 - removing the extents in the range
2056 * 1 - adding the hole extent
2057 */
2058 trans = btrfs_start_transaction(root, 3);
2059 if (IS_ERR(trans)) {
2060 err = PTR_ERR(trans);
2061 goto out_free;
2062 }
2063
2064 ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv,
2065 min_size);
2066 BUG_ON(ret);
2067 trans->block_rsv = rsv;
2068
2069 while (cur_offset < lockend) {
2070 ret = __btrfs_drop_extents(trans, root, inode, path,
2071 cur_offset, lockend + 1,
2072 &drop_end, 1);
2073 if (ret != -ENOSPC)
2074 break;
2075
2076 trans->block_rsv = &root->fs_info->trans_block_rsv;
2077
2078 ret = fill_holes(trans, inode, path, cur_offset, drop_end);
2079 if (ret) {
2080 err = ret;
2081 break;
2082 }
2083
2084 cur_offset = drop_end;
2085
2086 ret = btrfs_update_inode(trans, root, inode);
2087 if (ret) {
2088 err = ret;
2089 break;
2090 }
2091
Josef Bacik2aaa6652012-08-29 14:27:18 -04002092 btrfs_end_transaction(trans, root);
Liu Bob53d3f52012-11-14 14:34:34 +00002093 btrfs_btree_balance_dirty(root);
Josef Bacik2aaa6652012-08-29 14:27:18 -04002094
2095 trans = btrfs_start_transaction(root, 3);
2096 if (IS_ERR(trans)) {
2097 ret = PTR_ERR(trans);
2098 trans = NULL;
2099 break;
2100 }
2101
2102 ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv,
2103 rsv, min_size);
2104 BUG_ON(ret); /* shouldn't happen */
2105 trans->block_rsv = rsv;
2106 }
2107
2108 if (ret) {
2109 err = ret;
2110 goto out_trans;
2111 }
2112
2113 trans->block_rsv = &root->fs_info->trans_block_rsv;
2114 ret = fill_holes(trans, inode, path, cur_offset, drop_end);
2115 if (ret) {
2116 err = ret;
2117 goto out_trans;
2118 }
2119
2120out_trans:
2121 if (!trans)
2122 goto out_free;
2123
Tsutomu Itohe1f57902012-11-08 04:47:33 +00002124 inode_inc_iversion(inode);
2125 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2126
Josef Bacik2aaa6652012-08-29 14:27:18 -04002127 trans->block_rsv = &root->fs_info->trans_block_rsv;
2128 ret = btrfs_update_inode(trans, root, inode);
Josef Bacik2aaa6652012-08-29 14:27:18 -04002129 btrfs_end_transaction(trans, root);
Liu Bob53d3f52012-11-14 14:34:34 +00002130 btrfs_btree_balance_dirty(root);
Josef Bacik2aaa6652012-08-29 14:27:18 -04002131out_free:
2132 btrfs_free_path(path);
2133 btrfs_free_block_rsv(root, rsv);
2134out:
2135 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
2136 &cached_state, GFP_NOFS);
2137 mutex_unlock(&inode->i_mutex);
2138 if (ret && !err)
2139 err = ret;
2140 return err;
2141}
2142
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002143static long btrfs_fallocate(struct file *file, int mode,
2144 loff_t offset, loff_t len)
2145{
Al Viro496ad9a2013-01-23 17:07:38 -05002146 struct inode *inode = file_inode(file);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002147 struct extent_state *cached_state = NULL;
Wang Shilong61130772013-03-19 10:57:14 +00002148 struct btrfs_root *root = BTRFS_I(inode)->root;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002149 u64 cur_offset;
2150 u64 last_byte;
2151 u64 alloc_start;
2152 u64 alloc_end;
2153 u64 alloc_hint = 0;
2154 u64 locked_end;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002155 struct extent_map *em;
Miao Xie797f4272012-11-28 10:28:07 +00002156 int blocksize = BTRFS_I(inode)->root->sectorsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002157 int ret;
2158
Miao Xie797f4272012-11-28 10:28:07 +00002159 alloc_start = round_down(offset, blocksize);
2160 alloc_end = round_up(offset + len, blocksize);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002161
Josef Bacik2aaa6652012-08-29 14:27:18 -04002162 /* Make sure we aren't being give some crap mode */
2163 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002164 return -EOPNOTSUPP;
2165
Josef Bacik2aaa6652012-08-29 14:27:18 -04002166 if (mode & FALLOC_FL_PUNCH_HOLE)
2167 return btrfs_punch_hole(inode, offset, len);
2168
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002169 /*
Chris Masond98456f2012-01-31 20:27:41 -05002170 * Make sure we have enough space before we do the
2171 * allocation.
2172 */
Miao Xie0ff6fab2012-11-28 10:28:54 +00002173 ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start);
Chris Masond98456f2012-01-31 20:27:41 -05002174 if (ret)
2175 return ret;
Wang Shilong61130772013-03-19 10:57:14 +00002176 if (root->fs_info->quota_enabled) {
2177 ret = btrfs_qgroup_reserve(root, alloc_end - alloc_start);
2178 if (ret)
2179 goto out_reserve_fail;
2180 }
Chris Masond98456f2012-01-31 20:27:41 -05002181
2182 /*
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002183 * wait for ordered IO before we have any locks. We'll loop again
2184 * below with the locks held.
2185 */
2186 btrfs_wait_ordered_range(inode, alloc_start, alloc_end - alloc_start);
2187
2188 mutex_lock(&inode->i_mutex);
2189 ret = inode_newsize_ok(inode, alloc_end);
2190 if (ret)
2191 goto out;
2192
2193 if (alloc_start > inode->i_size) {
Josef Bacika41ad392011-01-31 15:30:16 -05002194 ret = btrfs_cont_expand(inode, i_size_read(inode),
2195 alloc_start);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002196 if (ret)
2197 goto out;
2198 }
2199
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002200 locked_end = alloc_end - 1;
2201 while (1) {
2202 struct btrfs_ordered_extent *ordered;
2203
2204 /* the extent lock is ordered inside the running
2205 * transaction
2206 */
2207 lock_extent_bits(&BTRFS_I(inode)->io_tree, alloc_start,
Jeff Mahoneyd0082372012-03-01 14:57:19 +01002208 locked_end, 0, &cached_state);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002209 ordered = btrfs_lookup_first_ordered_extent(inode,
2210 alloc_end - 1);
2211 if (ordered &&
2212 ordered->file_offset + ordered->len > alloc_start &&
2213 ordered->file_offset < alloc_end) {
2214 btrfs_put_ordered_extent(ordered);
2215 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
2216 alloc_start, locked_end,
2217 &cached_state, GFP_NOFS);
2218 /*
2219 * we can't wait on the range with the transaction
2220 * running or with the extent lock held
2221 */
2222 btrfs_wait_ordered_range(inode, alloc_start,
2223 alloc_end - alloc_start);
2224 } else {
2225 if (ordered)
2226 btrfs_put_ordered_extent(ordered);
2227 break;
2228 }
2229 }
2230
2231 cur_offset = alloc_start;
2232 while (1) {
Josef Bacikf1e490a2011-08-18 10:36:39 -04002233 u64 actual_end;
2234
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002235 em = btrfs_get_extent(inode, NULL, 0, cur_offset,
2236 alloc_end - cur_offset, 0);
Jeff Mahoney79787ea2012-03-12 16:03:00 +01002237 if (IS_ERR_OR_NULL(em)) {
2238 if (!em)
2239 ret = -ENOMEM;
2240 else
2241 ret = PTR_ERR(em);
2242 break;
2243 }
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002244 last_byte = min(extent_map_end(em), alloc_end);
Josef Bacikf1e490a2011-08-18 10:36:39 -04002245 actual_end = min_t(u64, extent_map_end(em), offset + len);
Miao Xie797f4272012-11-28 10:28:07 +00002246 last_byte = ALIGN(last_byte, blocksize);
Josef Bacikf1e490a2011-08-18 10:36:39 -04002247
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002248 if (em->block_start == EXTENT_MAP_HOLE ||
2249 (cur_offset >= inode->i_size &&
2250 !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
2251 ret = btrfs_prealloc_file_range(inode, mode, cur_offset,
2252 last_byte - cur_offset,
2253 1 << inode->i_blkbits,
2254 offset + len,
2255 &alloc_hint);
Josef Bacik1b9c3322011-08-17 10:19:52 -04002256
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002257 if (ret < 0) {
2258 free_extent_map(em);
2259 break;
2260 }
Josef Bacikf1e490a2011-08-18 10:36:39 -04002261 } else if (actual_end > inode->i_size &&
2262 !(mode & FALLOC_FL_KEEP_SIZE)) {
2263 /*
2264 * We didn't need to allocate any more space, but we
2265 * still extended the size of the file so we need to
2266 * update i_size.
2267 */
2268 inode->i_ctime = CURRENT_TIME;
2269 i_size_write(inode, actual_end);
2270 btrfs_ordered_update_i_size(inode, actual_end, NULL);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002271 }
2272 free_extent_map(em);
2273
2274 cur_offset = last_byte;
2275 if (cur_offset >= alloc_end) {
2276 ret = 0;
2277 break;
2278 }
2279 }
2280 unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,
2281 &cached_state, GFP_NOFS);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002282out:
2283 mutex_unlock(&inode->i_mutex);
Wang Shilong61130772013-03-19 10:57:14 +00002284 if (root->fs_info->quota_enabled)
2285 btrfs_qgroup_free(root, alloc_end - alloc_start);
2286out_reserve_fail:
Chris Masond98456f2012-01-31 20:27:41 -05002287 /* Let go of our reservation. */
Miao Xie0ff6fab2012-11-28 10:28:54 +00002288 btrfs_free_reserved_data_space(inode, alloc_end - alloc_start);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002289 return ret;
2290}
2291
Andrew Morton965c8e52012-12-17 15:59:39 -08002292static int find_desired_extent(struct inode *inode, loff_t *offset, int whence)
Josef Bacikb2675152011-07-18 13:21:36 -04002293{
2294 struct btrfs_root *root = BTRFS_I(inode)->root;
2295 struct extent_map *em;
2296 struct extent_state *cached_state = NULL;
2297 u64 lockstart = *offset;
2298 u64 lockend = i_size_read(inode);
2299 u64 start = *offset;
2300 u64 orig_start = *offset;
2301 u64 len = i_size_read(inode);
2302 u64 last_end = 0;
2303 int ret = 0;
2304
2305 lockend = max_t(u64, root->sectorsize, lockend);
2306 if (lockend <= lockstart)
2307 lockend = lockstart + root->sectorsize;
2308
Liu Bo1214b532013-01-07 03:53:08 +00002309 lockend--;
Josef Bacikb2675152011-07-18 13:21:36 -04002310 len = lockend - lockstart + 1;
2311
2312 len = max_t(u64, len, root->sectorsize);
2313 if (inode->i_size == 0)
2314 return -ENXIO;
2315
2316 lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, 0,
Jeff Mahoneyd0082372012-03-01 14:57:19 +01002317 &cached_state);
Josef Bacikb2675152011-07-18 13:21:36 -04002318
2319 /*
2320 * Delalloc is such a pain. If we have a hole and we have pending
2321 * delalloc for a portion of the hole we will get back a hole that
2322 * exists for the entire range since it hasn't been actually written
2323 * yet. So to take care of this case we need to look for an extent just
2324 * before the position we want in case there is outstanding delalloc
2325 * going on here.
2326 */
Andrew Morton965c8e52012-12-17 15:59:39 -08002327 if (whence == SEEK_HOLE && start != 0) {
Josef Bacikb2675152011-07-18 13:21:36 -04002328 if (start <= root->sectorsize)
2329 em = btrfs_get_extent_fiemap(inode, NULL, 0, 0,
2330 root->sectorsize, 0);
2331 else
2332 em = btrfs_get_extent_fiemap(inode, NULL, 0,
2333 start - root->sectorsize,
2334 root->sectorsize, 0);
2335 if (IS_ERR(em)) {
Jeff Liu6af021d2012-02-09 14:25:50 +08002336 ret = PTR_ERR(em);
Josef Bacikb2675152011-07-18 13:21:36 -04002337 goto out;
2338 }
2339 last_end = em->start + em->len;
2340 if (em->block_start == EXTENT_MAP_DELALLOC)
2341 last_end = min_t(u64, last_end, inode->i_size);
2342 free_extent_map(em);
2343 }
2344
2345 while (1) {
2346 em = btrfs_get_extent_fiemap(inode, NULL, 0, start, len, 0);
2347 if (IS_ERR(em)) {
Jeff Liu6af021d2012-02-09 14:25:50 +08002348 ret = PTR_ERR(em);
Josef Bacikb2675152011-07-18 13:21:36 -04002349 break;
2350 }
2351
2352 if (em->block_start == EXTENT_MAP_HOLE) {
2353 if (test_bit(EXTENT_FLAG_VACANCY, &em->flags)) {
2354 if (last_end <= orig_start) {
2355 free_extent_map(em);
2356 ret = -ENXIO;
2357 break;
2358 }
2359 }
2360
Andrew Morton965c8e52012-12-17 15:59:39 -08002361 if (whence == SEEK_HOLE) {
Josef Bacikb2675152011-07-18 13:21:36 -04002362 *offset = start;
2363 free_extent_map(em);
2364 break;
2365 }
2366 } else {
Andrew Morton965c8e52012-12-17 15:59:39 -08002367 if (whence == SEEK_DATA) {
Josef Bacikb2675152011-07-18 13:21:36 -04002368 if (em->block_start == EXTENT_MAP_DELALLOC) {
2369 if (start >= inode->i_size) {
2370 free_extent_map(em);
2371 ret = -ENXIO;
2372 break;
2373 }
2374 }
2375
Liu Bof9e4fb52013-01-07 10:10:12 +00002376 if (!test_bit(EXTENT_FLAG_PREALLOC,
2377 &em->flags)) {
2378 *offset = start;
2379 free_extent_map(em);
2380 break;
2381 }
Josef Bacikb2675152011-07-18 13:21:36 -04002382 }
2383 }
2384
2385 start = em->start + em->len;
2386 last_end = em->start + em->len;
2387
2388 if (em->block_start == EXTENT_MAP_DELALLOC)
2389 last_end = min_t(u64, last_end, inode->i_size);
2390
2391 if (test_bit(EXTENT_FLAG_VACANCY, &em->flags)) {
2392 free_extent_map(em);
2393 ret = -ENXIO;
2394 break;
2395 }
2396 free_extent_map(em);
2397 cond_resched();
2398 }
2399 if (!ret)
2400 *offset = min(*offset, inode->i_size);
2401out:
2402 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
2403 &cached_state, GFP_NOFS);
2404 return ret;
2405}
2406
Andrew Morton965c8e52012-12-17 15:59:39 -08002407static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence)
Josef Bacikb2675152011-07-18 13:21:36 -04002408{
2409 struct inode *inode = file->f_mapping->host;
2410 int ret;
2411
2412 mutex_lock(&inode->i_mutex);
Andrew Morton965c8e52012-12-17 15:59:39 -08002413 switch (whence) {
Josef Bacikb2675152011-07-18 13:21:36 -04002414 case SEEK_END:
2415 case SEEK_CUR:
Andrew Morton965c8e52012-12-17 15:59:39 -08002416 offset = generic_file_llseek(file, offset, whence);
Josef Bacikb2675152011-07-18 13:21:36 -04002417 goto out;
2418 case SEEK_DATA:
2419 case SEEK_HOLE:
Jeff Liu48802c82011-09-18 10:34:02 -04002420 if (offset >= i_size_read(inode)) {
2421 mutex_unlock(&inode->i_mutex);
2422 return -ENXIO;
2423 }
2424
Andrew Morton965c8e52012-12-17 15:59:39 -08002425 ret = find_desired_extent(inode, &offset, whence);
Josef Bacikb2675152011-07-18 13:21:36 -04002426 if (ret) {
2427 mutex_unlock(&inode->i_mutex);
2428 return ret;
2429 }
2430 }
2431
Dan Carpenter9a4327c2011-08-18 10:16:05 -04002432 if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) {
Jeff Liu48802c82011-09-18 10:34:02 -04002433 offset = -EINVAL;
Dan Carpenter9a4327c2011-08-18 10:16:05 -04002434 goto out;
2435 }
2436 if (offset > inode->i_sb->s_maxbytes) {
Jeff Liu48802c82011-09-18 10:34:02 -04002437 offset = -EINVAL;
Dan Carpenter9a4327c2011-08-18 10:16:05 -04002438 goto out;
2439 }
Josef Bacikb2675152011-07-18 13:21:36 -04002440
2441 /* Special lock needed here? */
2442 if (offset != file->f_pos) {
2443 file->f_pos = offset;
2444 file->f_version = 0;
2445 }
2446out:
2447 mutex_unlock(&inode->i_mutex);
2448 return offset;
2449}
2450
Alexey Dobriyan828c0952009-10-01 15:43:56 -07002451const struct file_operations btrfs_file_operations = {
Josef Bacikb2675152011-07-18 13:21:36 -04002452 .llseek = btrfs_file_llseek,
Chris Mason39279cc2007-06-12 06:35:45 -04002453 .read = do_sync_read,
Miao Xie4a0010712010-06-07 03:38:51 +00002454 .write = do_sync_write,
Chris Mason9ebefb182007-06-15 13:50:00 -04002455 .aio_read = generic_file_aio_read,
Chris Masone9906a92007-12-14 12:56:58 -05002456 .splice_read = generic_file_splice_read,
Josef Bacik11c65dc2010-05-23 11:07:21 -04002457 .aio_write = btrfs_file_aio_write,
Chris Mason9ebefb182007-06-15 13:50:00 -04002458 .mmap = btrfs_file_mmap,
Chris Mason39279cc2007-06-12 06:35:45 -04002459 .open = generic_file_open,
Mingminge1b81e62008-05-27 10:55:43 -04002460 .release = btrfs_release_file,
Chris Mason39279cc2007-06-12 06:35:45 -04002461 .fsync = btrfs_sync_file,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002462 .fallocate = btrfs_fallocate,
Christoph Hellwig34287aa2007-09-14 10:22:47 -04002463 .unlocked_ioctl = btrfs_ioctl,
Chris Mason39279cc2007-06-12 06:35:45 -04002464#ifdef CONFIG_COMPAT
Christoph Hellwig34287aa2007-09-14 10:22:47 -04002465 .compat_ioctl = btrfs_ioctl,
Chris Mason39279cc2007-06-12 06:35:45 -04002466#endif
2467};
Miao Xie9247f312012-11-26 09:24:43 +00002468
2469void btrfs_auto_defrag_exit(void)
2470{
2471 if (btrfs_inode_defrag_cachep)
2472 kmem_cache_destroy(btrfs_inode_defrag_cachep);
2473}
2474
2475int btrfs_auto_defrag_init(void)
2476{
2477 btrfs_inode_defrag_cachep = kmem_cache_create("btrfs_inode_defrag",
2478 sizeof(struct inode_defrag), 0,
2479 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
2480 NULL);
2481 if (!btrfs_inode_defrag_cachep)
2482 return -ENOMEM;
2483
2484 return 0;
2485}