blob: 1cc4d285951ca6ee4883519a40930b71b386b83a [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>
25#include <linux/smp_lock.h>
26#include <linux/backing-dev.h>
27#include <linux/mpage.h>
28#include <linux/swap.h>
29#include <linux/writeback.h>
30#include <linux/statfs.h>
31#include <linux/compat.h>
Chris Mason92fee662007-07-25 12:31:35 -040032#include <linux/version.h>
Chris Mason39279cc2007-06-12 06:35:45 -040033#include "ctree.h"
34#include "disk-io.h"
35#include "transaction.h"
36#include "btrfs_inode.h"
37#include "ioctl.h"
38#include "print-tree.h"
39
40
41static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
42 struct page **prepared_pages,
43 const char __user * buf)
44{
45 long page_fault = 0;
46 int i;
47 int offset = pos & (PAGE_CACHE_SIZE - 1);
48
49 for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
50 size_t count = min_t(size_t,
51 PAGE_CACHE_SIZE - offset, write_bytes);
52 struct page *page = prepared_pages[i];
53 fault_in_pages_readable(buf, count);
54
55 /* Copy data from userspace to the current page */
56 kmap(page);
57 page_fault = __copy_from_user(page_address(page) + offset,
58 buf, count);
59 /* Flush processor's dcache for this page */
60 flush_dcache_page(page);
61 kunmap(page);
62 buf += count;
63 write_bytes -= count;
64
65 if (page_fault)
66 break;
67 }
68 return page_fault ? -EFAULT : 0;
69}
70
71static void btrfs_drop_pages(struct page **pages, size_t num_pages)
72{
73 size_t i;
74 for (i = 0; i < num_pages; i++) {
75 if (!pages[i])
76 break;
77 unlock_page(pages[i]);
78 mark_page_accessed(pages[i]);
79 page_cache_release(pages[i]);
80 }
81}
82
Chris Masona52d9a82007-08-27 16:49:44 -040083static int insert_inline_extent(struct btrfs_trans_handle *trans,
84 struct btrfs_root *root, struct inode *inode,
Chris Mason3326d1b2007-10-15 16:18:25 -040085 u64 offset, size_t size,
86 struct page **pages, size_t page_offset,
87 int num_pages)
Chris Mason54aa1f42007-06-22 14:16:25 -040088{
89 struct btrfs_key key;
90 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -040091 struct extent_buffer *leaf;
92 char *kaddr;
93 unsigned long ptr;
Chris Mason54aa1f42007-06-22 14:16:25 -040094 struct btrfs_file_extent_item *ei;
Chris Mason3326d1b2007-10-15 16:18:25 -040095 struct page *page;
Chris Mason54aa1f42007-06-22 14:16:25 -040096 u32 datasize;
97 int err = 0;
98 int ret;
Chris Mason3326d1b2007-10-15 16:18:25 -040099 int i;
100 ssize_t cur_size;
Chris Mason54aa1f42007-06-22 14:16:25 -0400101
102 path = btrfs_alloc_path();
103 if (!path)
104 return -ENOMEM;
105
Chris Mason54aa1f42007-06-22 14:16:25 -0400106 btrfs_set_trans_block_group(trans, inode);
107
108 key.objectid = inode->i_ino;
109 key.offset = offset;
Chris Mason54aa1f42007-06-22 14:16:25 -0400110 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
Chris Mason54aa1f42007-06-22 14:16:25 -0400111
Chris Mason3326d1b2007-10-15 16:18:25 -0400112 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
113 if (ret < 0) {
Chris Mason54aa1f42007-06-22 14:16:25 -0400114 err = ret;
115 goto fail;
116 }
Chris Mason3326d1b2007-10-15 16:18:25 -0400117 if (ret == 1) {
Chris Mason179e29e2007-11-01 11:28:41 -0400118 struct btrfs_key found_key;
119
120 if (path->slots[0] == 0)
121 goto insert;
122
Chris Mason3326d1b2007-10-15 16:18:25 -0400123 path->slots[0]--;
124 leaf = path->nodes[0];
Chris Mason179e29e2007-11-01 11:28:41 -0400125 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
126
127 if (found_key.objectid != inode->i_ino)
128 goto insert;
129
130 if (found_key.type != BTRFS_EXTENT_DATA_KEY)
131 goto insert;
Chris Mason3326d1b2007-10-15 16:18:25 -0400132 ei = btrfs_item_ptr(leaf, path->slots[0],
133 struct btrfs_file_extent_item);
Chris Mason54aa1f42007-06-22 14:16:25 -0400134
Chris Mason3326d1b2007-10-15 16:18:25 -0400135 if (btrfs_file_extent_type(leaf, ei) !=
136 BTRFS_FILE_EXTENT_INLINE) {
137 goto insert;
138 }
139 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
140 ret = 0;
141 }
142 if (ret == 0) {
143 u32 found_size;
Yan18f16f72007-10-25 15:42:57 -0400144 u64 found_end;
Chris Mason3326d1b2007-10-15 16:18:25 -0400145
146 leaf = path->nodes[0];
147 ei = btrfs_item_ptr(leaf, path->slots[0],
148 struct btrfs_file_extent_item);
149
150 if (btrfs_file_extent_type(leaf, ei) !=
151 BTRFS_FILE_EXTENT_INLINE) {
152 err = ret;
153 btrfs_print_leaf(root, leaf);
154 printk("found wasn't inline offset %Lu inode %lu\n",
155 offset, inode->i_ino);
156 goto fail;
157 }
Chris Mason3326d1b2007-10-15 16:18:25 -0400158 found_size = btrfs_file_extent_inline_len(leaf,
159 btrfs_item_nr(leaf, path->slots[0]));
Yan18f16f72007-10-25 15:42:57 -0400160 found_end = key.offset + found_size;
Chris Mason3326d1b2007-10-15 16:18:25 -0400161
Yan18f16f72007-10-25 15:42:57 -0400162 if (found_end < offset + size) {
Chris Mason3326d1b2007-10-15 16:18:25 -0400163 btrfs_release_path(root, path);
164 ret = btrfs_search_slot(trans, root, &key, path,
Yan18f16f72007-10-25 15:42:57 -0400165 offset + size - found_end, 1);
Chris Mason3326d1b2007-10-15 16:18:25 -0400166 BUG_ON(ret != 0);
Chris Mason179e29e2007-11-01 11:28:41 -0400167
Chris Mason3326d1b2007-10-15 16:18:25 -0400168 ret = btrfs_extend_item(trans, root, path,
Yan18f16f72007-10-25 15:42:57 -0400169 offset + size - found_end);
Chris Mason3326d1b2007-10-15 16:18:25 -0400170 if (ret) {
171 err = ret;
172 goto fail;
173 }
174 leaf = path->nodes[0];
175 ei = btrfs_item_ptr(leaf, path->slots[0],
176 struct btrfs_file_extent_item);
177 }
Yan18f16f72007-10-25 15:42:57 -0400178 if (found_end < offset) {
179 ptr = btrfs_file_extent_inline_start(ei) + found_size;
180 memset_extent_buffer(leaf, 0, ptr, offset - found_end);
181 }
Chris Mason3326d1b2007-10-15 16:18:25 -0400182 } else {
183insert:
184 btrfs_release_path(root, path);
Yan18f16f72007-10-25 15:42:57 -0400185 datasize = offset + size - key.offset;
186 datasize = btrfs_file_extent_calc_inline_size(datasize);
Chris Mason3326d1b2007-10-15 16:18:25 -0400187 ret = btrfs_insert_empty_item(trans, root, path, &key,
188 datasize);
189 if (ret) {
190 err = ret;
191 printk("got bad ret %d\n", ret);
192 goto fail;
193 }
194 leaf = path->nodes[0];
195 ei = btrfs_item_ptr(leaf, path->slots[0],
196 struct btrfs_file_extent_item);
197 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
198 btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
199 }
Yan18f16f72007-10-25 15:42:57 -0400200 ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset;
Chris Mason3326d1b2007-10-15 16:18:25 -0400201
202 cur_size = size;
203 i = 0;
204 while (size > 0) {
205 page = pages[i];
206 kaddr = kmap_atomic(page, KM_USER0);
Jens Axboeae2f5412007-10-19 09:22:59 -0400207 cur_size = min_t(size_t, PAGE_CACHE_SIZE - page_offset, size);
Chris Mason3326d1b2007-10-15 16:18:25 -0400208 write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size);
209 kunmap_atomic(kaddr, KM_USER0);
210 page_offset = 0;
211 ptr += cur_size;
212 size -= cur_size;
213 if (i >= num_pages) {
214 printk("i %d num_pages %d\n", i, num_pages);
215 }
216 i++;
217 }
Chris Mason5f39d392007-10-15 16:14:19 -0400218 btrfs_mark_buffer_dirty(leaf);
Chris Mason54aa1f42007-06-22 14:16:25 -0400219fail:
220 btrfs_free_path(path);
Chris Mason54aa1f42007-06-22 14:16:25 -0400221 return err;
222}
223
Chris Mason39279cc2007-06-12 06:35:45 -0400224static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
225 struct btrfs_root *root,
226 struct file *file,
227 struct page **pages,
228 size_t num_pages,
229 loff_t pos,
230 size_t write_bytes)
231{
Chris Mason39279cc2007-06-12 06:35:45 -0400232 int err = 0;
Chris Masona52d9a82007-08-27 16:49:44 -0400233 int i;
Chris Mason39279cc2007-06-12 06:35:45 -0400234 struct inode *inode = file->f_path.dentry->d_inode;
Chris Masona52d9a82007-08-27 16:49:44 -0400235 struct extent_map *em;
236 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
Chris Masondb945352007-10-15 16:15:53 -0400237 u64 hint_byte;
238 u64 num_bytes;
Chris Masona52d9a82007-08-27 16:49:44 -0400239 u64 start_pos;
240 u64 end_of_last_block;
241 u64 end_pos = pos + write_bytes;
Yandcfec0d2007-11-06 10:26:26 -0500242 u64 inline_size;
Chris Masona52d9a82007-08-27 16:49:44 -0400243 loff_t isize = i_size_read(inode);
Chris Masona52d9a82007-08-27 16:49:44 -0400244 em = alloc_extent_map(GFP_NOFS);
245 if (!em)
246 return -ENOMEM;
Chris Mason39279cc2007-06-12 06:35:45 -0400247
Chris Masona52d9a82007-08-27 16:49:44 -0400248 em->bdev = inode->i_sb->s_bdev;
Chris Mason39279cc2007-06-12 06:35:45 -0400249
Chris Mason5f39d392007-10-15 16:14:19 -0400250 start_pos = pos & ~((u64)root->sectorsize - 1);
Chris Masondb945352007-10-15 16:15:53 -0400251 num_bytes = (write_bytes + pos - start_pos +
252 root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
Chris Mason39279cc2007-06-12 06:35:45 -0400253
Chris Mason011410b2007-09-10 19:58:36 -0400254 down_read(&BTRFS_I(inode)->root->snap_sem);
Chris Masondb945352007-10-15 16:15:53 -0400255 end_of_last_block = start_pos + num_bytes - 1;
256
Chris Masonb888db22007-08-27 16:49:44 -0400257 lock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS);
Chris Masona52d9a82007-08-27 16:49:44 -0400258 mutex_lock(&root->fs_info->fs_mutex);
259 trans = btrfs_start_transaction(root, 1);
260 if (!trans) {
261 err = -ENOMEM;
262 goto out_unlock;
263 }
264 btrfs_set_trans_block_group(trans, inode);
Chris Masondb945352007-10-15 16:15:53 -0400265 inode->i_blocks += num_bytes >> 9;
266 hint_byte = 0;
Chris Masona52d9a82007-08-27 16:49:44 -0400267
268 if ((end_of_last_block & 4095) == 0) {
Christoph Hellwig94330632007-09-10 20:02:22 -0400269 printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block);
Chris Masona52d9a82007-08-27 16:49:44 -0400270 }
271 set_extent_uptodate(em_tree, start_pos, end_of_last_block, GFP_NOFS);
272
273 /* FIXME...EIEIO, ENOSPC and more */
274
Chris Masona52d9a82007-08-27 16:49:44 -0400275 /* insert any holes we need to create */
276 if (inode->i_size < start_pos) {
277 u64 last_pos_in_file;
278 u64 hole_size;
Chris Mason5f39d392007-10-15 16:14:19 -0400279 u64 mask = root->sectorsize - 1;
Chris Masona52d9a82007-08-27 16:49:44 -0400280 last_pos_in_file = (isize + mask) & ~mask;
281 hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
Chris Mason2bf5a722007-08-30 11:54:02 -0400282
Chris Masona52d9a82007-08-27 16:49:44 -0400283 if (last_pos_in_file < start_pos) {
Chris Mason2bf5a722007-08-30 11:54:02 -0400284 err = btrfs_drop_extents(trans, root, inode,
285 last_pos_in_file,
286 last_pos_in_file + hole_size,
Chris Mason3326d1b2007-10-15 16:18:25 -0400287 last_pos_in_file,
Chris Masondb945352007-10-15 16:15:53 -0400288 &hint_byte);
Chris Mason2bf5a722007-08-30 11:54:02 -0400289 if (err)
290 goto failed;
291
Chris Masona52d9a82007-08-27 16:49:44 -0400292 err = btrfs_insert_file_extent(trans, root,
293 inode->i_ino,
294 last_pos_in_file,
295 0, 0, hole_size);
Chris Mason39279cc2007-06-12 06:35:45 -0400296 }
Chris Masona52d9a82007-08-27 16:49:44 -0400297 if (err)
298 goto failed;
299 }
300
301 /*
302 * either allocate an extent for the new bytes or setup the key
303 * to show we are doing inline data in the extent
304 */
Chris Mason3326d1b2007-10-15 16:18:25 -0400305 inline_size = end_pos;
306 if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
Chris Mason179e29e2007-11-01 11:28:41 -0400307 inline_size > 32768 ||
Chris Mason3326d1b2007-10-15 16:18:25 -0400308 inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
Chris Masonb888db22007-08-27 16:49:44 -0400309 u64 last_end;
Chris Mason3326d1b2007-10-15 16:18:25 -0400310
Chris Masona52d9a82007-08-27 16:49:44 -0400311 for (i = 0; i < num_pages; i++) {
312 struct page *p = pages[i];
313 SetPageUptodate(p);
Chris Masonb888db22007-08-27 16:49:44 -0400314 set_page_dirty(p);
Chris Masona52d9a82007-08-27 16:49:44 -0400315 }
Chris Mason35ebb932007-10-30 16:56:53 -0400316 last_end = (u64)(pages[num_pages -1]->index) <<
317 PAGE_CACHE_SHIFT;
Chris Masonb888db22007-08-27 16:49:44 -0400318 last_end += PAGE_CACHE_SIZE - 1;
319 set_extent_delalloc(em_tree, start_pos, end_of_last_block,
320 GFP_NOFS);
Chris Masona52d9a82007-08-27 16:49:44 -0400321 } else {
Chris Mason3326d1b2007-10-15 16:18:25 -0400322 u64 aligned_end;
Chris Masonb888db22007-08-27 16:49:44 -0400323 /* step one, delete the existing extents in this range */
Chris Mason3326d1b2007-10-15 16:18:25 -0400324 aligned_end = (pos + write_bytes + root->sectorsize - 1) &
325 ~((u64)root->sectorsize - 1);
Chris Mason2bf5a722007-08-30 11:54:02 -0400326 err = btrfs_drop_extents(trans, root, inode, start_pos,
Chris Mason179e29e2007-11-01 11:28:41 -0400327 aligned_end, aligned_end, &hint_byte);
Chris Mason2bf5a722007-08-30 11:54:02 -0400328 if (err)
329 goto failed;
Yandcfec0d2007-11-06 10:26:26 -0500330 if (isize > inline_size)
331 inline_size = min_t(u64, isize, aligned_end);
332 inline_size -= start_pos;
Chris Masona52d9a82007-08-27 16:49:44 -0400333 err = insert_inline_extent(trans, root, inode, start_pos,
Yandcfec0d2007-11-06 10:26:26 -0500334 inline_size, pages, 0, num_pages);
Chris Masona52d9a82007-08-27 16:49:44 -0400335 BUG_ON(err);
Chris Masona52d9a82007-08-27 16:49:44 -0400336 }
337 if (end_pos > isize) {
338 i_size_write(inode, end_pos);
339 btrfs_update_inode(trans, root, inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400340 }
341failed:
Chris Masona52d9a82007-08-27 16:49:44 -0400342 err = btrfs_end_transaction(trans, root);
343out_unlock:
344 mutex_unlock(&root->fs_info->fs_mutex);
Chris Masonb888db22007-08-27 16:49:44 -0400345 unlock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS);
Chris Masona52d9a82007-08-27 16:49:44 -0400346 free_extent_map(em);
Chris Mason011410b2007-09-10 19:58:36 -0400347 up_read(&BTRFS_I(inode)->root->snap_sem);
Chris Mason39279cc2007-06-12 06:35:45 -0400348 return err;
349}
350
Chris Masona52d9a82007-08-27 16:49:44 -0400351int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
352{
353 struct extent_map *em;
354 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
355
356 while(1) {
357 em = lookup_extent_mapping(em_tree, start, end);
358 if (!em)
359 break;
360 remove_extent_mapping(em_tree, em);
361 /* once for us */
362 free_extent_map(em);
363 /* once for the tree*/
364 free_extent_map(em);
365 }
366 return 0;
367}
368
Chris Mason39279cc2007-06-12 06:35:45 -0400369/*
370 * this is very complex, but the basic idea is to drop all extents
371 * in the range start - end. hint_block is filled in with a block number
372 * that would be a good hint to the block allocator for this file.
373 *
374 * If an extent intersects the range but is not entirely inside the range
375 * it is either truncated or split. Anything entirely inside the range
376 * is deleted from the tree.
377 */
378int btrfs_drop_extents(struct btrfs_trans_handle *trans,
379 struct btrfs_root *root, struct inode *inode,
Chris Mason00f5c792007-11-30 10:09:33 -0500380 u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
Chris Mason39279cc2007-06-12 06:35:45 -0400381{
Chris Mason39279cc2007-06-12 06:35:45 -0400382 u64 extent_end = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400383 u64 search_start = start;
Chris Mason00f5c792007-11-30 10:09:33 -0500384 struct extent_buffer *leaf;
385 struct btrfs_file_extent_item *extent;
386 struct btrfs_path *path;
387 struct btrfs_key key;
388 struct btrfs_file_extent_item old;
389 int keep;
390 int slot;
Chris Mason39279cc2007-06-12 06:35:45 -0400391 int bookend;
392 int found_type;
393 int found_extent;
394 int found_inline;
Chris Masonccd467d2007-06-28 15:57:36 -0400395 int recow;
Chris Mason00f5c792007-11-30 10:09:33 -0500396 int ret;
Chris Mason39279cc2007-06-12 06:35:45 -0400397
Chris Masona52d9a82007-08-27 16:49:44 -0400398 btrfs_drop_extent_cache(inode, start, end - 1);
399
Chris Mason39279cc2007-06-12 06:35:45 -0400400 path = btrfs_alloc_path();
401 if (!path)
402 return -ENOMEM;
403 while(1) {
Chris Masonccd467d2007-06-28 15:57:36 -0400404 recow = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400405 btrfs_release_path(root, path);
406 ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
407 search_start, -1);
408 if (ret < 0)
409 goto out;
410 if (ret > 0) {
411 if (path->slots[0] == 0) {
412 ret = 0;
413 goto out;
414 }
415 path->slots[0]--;
416 }
Chris Mason8c2383c2007-06-18 09:57:58 -0400417next_slot:
Chris Mason39279cc2007-06-12 06:35:45 -0400418 keep = 0;
419 bookend = 0;
420 found_extent = 0;
421 found_inline = 0;
422 extent = NULL;
Chris Mason5f39d392007-10-15 16:14:19 -0400423 leaf = path->nodes[0];
Chris Mason39279cc2007-06-12 06:35:45 -0400424 slot = path->slots[0];
Chris Mason8c2383c2007-06-18 09:57:58 -0400425 ret = 0;
Chris Mason5f39d392007-10-15 16:14:19 -0400426 btrfs_item_key_to_cpu(leaf, &key, slot);
Chris Mason39279cc2007-06-12 06:35:45 -0400427 if (key.offset >= end || key.objectid != inode->i_ino) {
Chris Mason39279cc2007-06-12 06:35:45 -0400428 goto out;
429 }
Chris Mason8c2383c2007-06-18 09:57:58 -0400430 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY) {
Chris Mason39279cc2007-06-12 06:35:45 -0400431 goto out;
432 }
Chris Masonccd467d2007-06-28 15:57:36 -0400433 if (recow) {
434 search_start = key.offset;
435 continue;
436 }
Chris Mason8c2383c2007-06-18 09:57:58 -0400437 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
438 extent = btrfs_item_ptr(leaf, slot,
439 struct btrfs_file_extent_item);
Chris Mason5f39d392007-10-15 16:14:19 -0400440 found_type = btrfs_file_extent_type(leaf, extent);
Chris Mason8c2383c2007-06-18 09:57:58 -0400441 if (found_type == BTRFS_FILE_EXTENT_REG) {
Chris Mason257d0ce2007-11-07 21:08:16 -0500442 extent_end =
443 btrfs_file_extent_disk_bytenr(leaf,
444 extent);
445 if (extent_end)
446 *hint_byte = extent_end;
447
Chris Mason8c2383c2007-06-18 09:57:58 -0400448 extent_end = key.offset +
Chris Masondb945352007-10-15 16:15:53 -0400449 btrfs_file_extent_num_bytes(leaf, extent);
Chris Mason8c2383c2007-06-18 09:57:58 -0400450 found_extent = 1;
451 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
Chris Mason5f39d392007-10-15 16:14:19 -0400452 struct btrfs_item *item;
453 item = btrfs_item_nr(leaf, slot);
Chris Mason8c2383c2007-06-18 09:57:58 -0400454 found_inline = 1;
455 extent_end = key.offset +
Chris Mason5f39d392007-10-15 16:14:19 -0400456 btrfs_file_extent_inline_len(leaf, item);
Chris Mason8c2383c2007-06-18 09:57:58 -0400457 }
458 } else {
459 extent_end = search_start;
Chris Mason39279cc2007-06-12 06:35:45 -0400460 }
461
462 /* we found nothing we can drop */
Chris Mason8c2383c2007-06-18 09:57:58 -0400463 if ((!found_extent && !found_inline) ||
464 search_start >= extent_end) {
465 int nextret;
466 u32 nritems;
Chris Mason5f39d392007-10-15 16:14:19 -0400467 nritems = btrfs_header_nritems(leaf);
Chris Mason8c2383c2007-06-18 09:57:58 -0400468 if (slot >= nritems - 1) {
469 nextret = btrfs_next_leaf(root, path);
470 if (nextret)
471 goto out;
Chris Masonccd467d2007-06-28 15:57:36 -0400472 recow = 1;
Chris Mason8c2383c2007-06-18 09:57:58 -0400473 } else {
474 path->slots[0]++;
475 }
476 goto next_slot;
Chris Mason39279cc2007-06-12 06:35:45 -0400477 }
478
Chris Mason39279cc2007-06-12 06:35:45 -0400479 if (found_inline) {
Chris Mason5f39d392007-10-15 16:14:19 -0400480 u64 mask = root->sectorsize - 1;
Chris Mason39279cc2007-06-12 06:35:45 -0400481 search_start = (extent_end + mask) & ~mask;
482 } else
483 search_start = extent_end;
Yana2732082007-11-06 10:26:28 -0500484 if (end < extent_end && start > key.offset && found_inline) {
Chris Mason179e29e2007-11-01 11:28:41 -0400485 *hint_byte = EXTENT_MAP_INLINE;
486 }
Chris Mason39279cc2007-06-12 06:35:45 -0400487 if (end < extent_end && end >= key.offset) {
488 if (found_extent) {
Chris Masondb945352007-10-15 16:15:53 -0400489 u64 disk_bytenr =
490 btrfs_file_extent_disk_bytenr(leaf, extent);
491 u64 disk_num_bytes =
492 btrfs_file_extent_disk_num_bytes(leaf,
Chris Mason5f39d392007-10-15 16:14:19 -0400493 extent);
494 read_extent_buffer(leaf, &old,
495 (unsigned long)extent,
496 sizeof(old));
Chris Masondb945352007-10-15 16:15:53 -0400497 if (disk_bytenr != 0) {
Chris Mason39279cc2007-06-12 06:35:45 -0400498 ret = btrfs_inc_extent_ref(trans, root,
Chris Mason7bb86312007-12-11 09:25:06 -0500499 disk_bytenr, disk_num_bytes,
500 root->root_key.objectid,
501 trans->transid,
502 key.objectid, end);
Chris Mason39279cc2007-06-12 06:35:45 -0400503 BUG_ON(ret);
504 }
505 }
Chris Mason179e29e2007-11-01 11:28:41 -0400506 bookend = 1;
507 if (found_inline && start <= key.offset &&
Chris Mason00f5c792007-11-30 10:09:33 -0500508 inline_limit < extent_end)
Chris Mason179e29e2007-11-01 11:28:41 -0400509 keep = 1;
Chris Mason39279cc2007-06-12 06:35:45 -0400510 }
Chris Mason39279cc2007-06-12 06:35:45 -0400511 /* truncate existing extent */
512 if (start > key.offset) {
513 u64 new_num;
514 u64 old_num;
515 keep = 1;
Chris Mason5f39d392007-10-15 16:14:19 -0400516 WARN_ON(start & (root->sectorsize - 1));
Chris Mason39279cc2007-06-12 06:35:45 -0400517 if (found_extent) {
Chris Masondb945352007-10-15 16:15:53 -0400518 new_num = start - key.offset;
519 old_num = btrfs_file_extent_num_bytes(leaf,
520 extent);
521 *hint_byte =
522 btrfs_file_extent_disk_bytenr(leaf,
523 extent);
524 if (btrfs_file_extent_disk_bytenr(leaf,
525 extent)) {
Chris Mason39279cc2007-06-12 06:35:45 -0400526 inode->i_blocks -=
Chris Masondb945352007-10-15 16:15:53 -0400527 (old_num - new_num) >> 9;
Chris Mason39279cc2007-06-12 06:35:45 -0400528 }
Chris Masondb945352007-10-15 16:15:53 -0400529 btrfs_set_file_extent_num_bytes(leaf, extent,
530 new_num);
Chris Mason5f39d392007-10-15 16:14:19 -0400531 btrfs_mark_buffer_dirty(leaf);
Chris Mason00f5c792007-11-30 10:09:33 -0500532 } else if (key.offset < inline_limit &&
533 (end > extent_end) &&
534 (inline_limit < extent_end)) {
Chris Mason3326d1b2007-10-15 16:18:25 -0400535 u32 new_size;
536 new_size = btrfs_file_extent_calc_inline_size(
Chris Mason00f5c792007-11-30 10:09:33 -0500537 inline_limit - key.offset);
Chris Mason3326d1b2007-10-15 16:18:25 -0400538 btrfs_truncate_item(trans, root, path,
Chris Mason179e29e2007-11-01 11:28:41 -0400539 new_size, 1);
Chris Mason39279cc2007-06-12 06:35:45 -0400540 }
541 }
542 /* delete the entire extent */
543 if (!keep) {
Chris Masondb945352007-10-15 16:15:53 -0400544 u64 disk_bytenr = 0;
545 u64 disk_num_bytes = 0;
546 u64 extent_num_bytes = 0;
Chris Mason7bb86312007-12-11 09:25:06 -0500547 u64 root_gen;
Chris Masond8d5f3e2007-12-11 12:42:00 -0500548 u64 root_owner;
Chris Mason7bb86312007-12-11 09:25:06 -0500549
Chris Masond8d5f3e2007-12-11 12:42:00 -0500550 root_gen = btrfs_header_generation(leaf);
551 root_owner = btrfs_header_owner(leaf);
Chris Mason39279cc2007-06-12 06:35:45 -0400552 if (found_extent) {
Chris Masondb945352007-10-15 16:15:53 -0400553 disk_bytenr =
554 btrfs_file_extent_disk_bytenr(leaf,
Chris Mason5f39d392007-10-15 16:14:19 -0400555 extent);
Chris Masondb945352007-10-15 16:15:53 -0400556 disk_num_bytes =
557 btrfs_file_extent_disk_num_bytes(leaf,
Chris Mason5f39d392007-10-15 16:14:19 -0400558 extent);
Chris Masondb945352007-10-15 16:15:53 -0400559 extent_num_bytes =
560 btrfs_file_extent_num_bytes(leaf, extent);
561 *hint_byte =
562 btrfs_file_extent_disk_bytenr(leaf,
563 extent);
Chris Mason39279cc2007-06-12 06:35:45 -0400564 }
565 ret = btrfs_del_item(trans, root, path);
Chris Mason54aa1f42007-06-22 14:16:25 -0400566 /* TODO update progress marker and return */
Chris Mason39279cc2007-06-12 06:35:45 -0400567 BUG_ON(ret);
568 btrfs_release_path(root, path);
569 extent = NULL;
Chris Masondb945352007-10-15 16:15:53 -0400570 if (found_extent && disk_bytenr != 0) {
571 inode->i_blocks -= extent_num_bytes >> 9;
Chris Mason39279cc2007-06-12 06:35:45 -0400572 ret = btrfs_free_extent(trans, root,
Chris Mason7bb86312007-12-11 09:25:06 -0500573 disk_bytenr,
574 disk_num_bytes,
Chris Masond8d5f3e2007-12-11 12:42:00 -0500575 root_owner,
Chris Mason7bb86312007-12-11 09:25:06 -0500576 root_gen, inode->i_ino,
577 key.offset, 0);
Chris Mason39279cc2007-06-12 06:35:45 -0400578 }
579
580 BUG_ON(ret);
581 if (!bookend && search_start >= end) {
582 ret = 0;
583 goto out;
584 }
585 if (!bookend)
586 continue;
587 }
Chris Mason179e29e2007-11-01 11:28:41 -0400588 if (bookend && found_inline && start <= key.offset &&
Chris Mason00f5c792007-11-30 10:09:33 -0500589 inline_limit < extent_end && key.offset <= inline_limit) {
Chris Mason179e29e2007-11-01 11:28:41 -0400590 u32 new_size;
591 new_size = btrfs_file_extent_calc_inline_size(
Chris Mason00f5c792007-11-30 10:09:33 -0500592 extent_end - inline_limit);
Chris Mason179e29e2007-11-01 11:28:41 -0400593 btrfs_truncate_item(trans, root, path, new_size, 0);
594 }
Chris Mason39279cc2007-06-12 06:35:45 -0400595 /* create bookend, splitting the extent in two */
596 if (bookend && found_extent) {
597 struct btrfs_key ins;
598 ins.objectid = inode->i_ino;
599 ins.offset = end;
Chris Mason39279cc2007-06-12 06:35:45 -0400600 btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
Chris Mason39279cc2007-06-12 06:35:45 -0400601 btrfs_release_path(root, path);
602 ret = btrfs_insert_empty_item(trans, root, path, &ins,
603 sizeof(*extent));
Chris Mason8c2383c2007-06-18 09:57:58 -0400604
Chris Mason5f39d392007-10-15 16:14:19 -0400605 leaf = path->nodes[0];
Chris Mason8c2383c2007-06-18 09:57:58 -0400606 if (ret) {
Chris Mason5f39d392007-10-15 16:14:19 -0400607 btrfs_print_leaf(root, leaf);
608 printk("got %d on inserting %Lu %u %Lu start %Lu end %Lu found %Lu %Lu keep was %d\n", ret , ins.objectid, ins.type, ins.offset, start, end, key.offset, extent_end, keep);
Chris Mason8c2383c2007-06-18 09:57:58 -0400609 }
Chris Mason39279cc2007-06-12 06:35:45 -0400610 BUG_ON(ret);
Chris Mason5f39d392007-10-15 16:14:19 -0400611 extent = btrfs_item_ptr(leaf, path->slots[0],
612 struct btrfs_file_extent_item);
613 write_extent_buffer(leaf, &old,
614 (unsigned long)extent, sizeof(old));
Chris Mason39279cc2007-06-12 06:35:45 -0400615
Chris Mason5f39d392007-10-15 16:14:19 -0400616 btrfs_set_file_extent_offset(leaf, extent,
Chris Masondb945352007-10-15 16:15:53 -0400617 le64_to_cpu(old.offset) + end - key.offset);
618 WARN_ON(le64_to_cpu(old.num_bytes) <
619 (extent_end - end));
620 btrfs_set_file_extent_num_bytes(leaf, extent,
621 extent_end - end);
Chris Mason5f39d392007-10-15 16:14:19 -0400622 btrfs_set_file_extent_type(leaf, extent,
Chris Mason39279cc2007-06-12 06:35:45 -0400623 BTRFS_FILE_EXTENT_REG);
Chris Masondb945352007-10-15 16:15:53 -0400624
Chris Mason39279cc2007-06-12 06:35:45 -0400625 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masondb945352007-10-15 16:15:53 -0400626 if (le64_to_cpu(old.disk_bytenr) != 0) {
Chris Mason39279cc2007-06-12 06:35:45 -0400627 inode->i_blocks +=
Chris Masondb945352007-10-15 16:15:53 -0400628 btrfs_file_extent_num_bytes(leaf,
629 extent) >> 9;
Chris Mason39279cc2007-06-12 06:35:45 -0400630 }
631 ret = 0;
632 goto out;
633 }
634 }
635out:
636 btrfs_free_path(path);
637 return ret;
638}
639
640/*
641 * this gets pages into the page cache and locks them down
642 */
643static int prepare_pages(struct btrfs_root *root,
644 struct file *file,
645 struct page **pages,
646 size_t num_pages,
647 loff_t pos,
648 unsigned long first_index,
649 unsigned long last_index,
Chris Mason8c2383c2007-06-18 09:57:58 -0400650 size_t write_bytes)
Chris Mason39279cc2007-06-12 06:35:45 -0400651{
652 int i;
653 unsigned long index = pos >> PAGE_CACHE_SHIFT;
654 struct inode *inode = file->f_path.dentry->d_inode;
Chris Mason39279cc2007-06-12 06:35:45 -0400655 int err = 0;
Chris Mason8c2383c2007-06-18 09:57:58 -0400656 u64 start_pos;
Chris Mason8c2383c2007-06-18 09:57:58 -0400657
Chris Mason5f39d392007-10-15 16:14:19 -0400658 start_pos = pos & ~((u64)root->sectorsize - 1);
Chris Mason39279cc2007-06-12 06:35:45 -0400659
660 memset(pages, 0, num_pages * sizeof(struct page *));
661
662 for (i = 0; i < num_pages; i++) {
663 pages[i] = grab_cache_page(inode->i_mapping, index + i);
664 if (!pages[i]) {
665 err = -ENOMEM;
Chris Masona52d9a82007-08-27 16:49:44 -0400666 BUG_ON(1);
Chris Mason39279cc2007-06-12 06:35:45 -0400667 }
Chris Masonccd467d2007-06-28 15:57:36 -0400668 cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
669 wait_on_page_writeback(pages[i]);
Christoph Hellwigb3cfa352007-09-17 11:25:58 -0400670 set_page_extent_mapped(pages[i]);
Chris Masonb888db22007-08-27 16:49:44 -0400671 WARN_ON(!PageLocked(pages[i]));
Chris Mason39279cc2007-06-12 06:35:45 -0400672 }
673 return 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400674}
675
676static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
677 size_t count, loff_t *ppos)
678{
679 loff_t pos;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400680 loff_t start_pos;
681 ssize_t num_written = 0;
682 ssize_t err = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400683 int ret = 0;
684 struct inode *inode = file->f_path.dentry->d_inode;
685 struct btrfs_root *root = BTRFS_I(inode)->root;
Chris Mason8c2383c2007-06-18 09:57:58 -0400686 struct page **pages = NULL;
687 int nrptrs;
Chris Mason39279cc2007-06-12 06:35:45 -0400688 struct page *pinned[2];
689 unsigned long first_index;
690 unsigned long last_index;
Chris Mason8c2383c2007-06-18 09:57:58 -0400691
692 nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE,
693 PAGE_CACHE_SIZE / (sizeof(struct page *)));
Chris Mason39279cc2007-06-12 06:35:45 -0400694 pinned[0] = NULL;
695 pinned[1] = NULL;
696 if (file->f_flags & O_DIRECT)
697 return -EINVAL;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400698
Chris Mason39279cc2007-06-12 06:35:45 -0400699 pos = *ppos;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400700 start_pos = pos;
701
Chris Mason39279cc2007-06-12 06:35:45 -0400702 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
703 current->backing_dev_info = inode->i_mapping->backing_dev_info;
704 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
705 if (err)
706 goto out;
707 if (count == 0)
708 goto out;
709 err = remove_suid(file->f_path.dentry);
710 if (err)
711 goto out;
712 file_update_time(file);
713
Chris Mason8c2383c2007-06-18 09:57:58 -0400714 pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
Chris Mason39279cc2007-06-12 06:35:45 -0400715
716 mutex_lock(&inode->i_mutex);
717 first_index = pos >> PAGE_CACHE_SHIFT;
718 last_index = (pos + count) >> PAGE_CACHE_SHIFT;
719
720 /*
721 * there are lots of better ways to do this, but this code
722 * makes sure the first and last page in the file range are
723 * up to date and ready for cow
724 */
725 if ((pos & (PAGE_CACHE_SIZE - 1))) {
726 pinned[0] = grab_cache_page(inode->i_mapping, first_index);
727 if (!PageUptodate(pinned[0])) {
Chris Mason9ebefb182007-06-15 13:50:00 -0400728 ret = btrfs_readpage(NULL, pinned[0]);
Chris Mason39279cc2007-06-12 06:35:45 -0400729 BUG_ON(ret);
730 wait_on_page_locked(pinned[0]);
731 } else {
732 unlock_page(pinned[0]);
733 }
734 }
735 if ((pos + count) & (PAGE_CACHE_SIZE - 1)) {
736 pinned[1] = grab_cache_page(inode->i_mapping, last_index);
737 if (!PageUptodate(pinned[1])) {
Chris Mason9ebefb182007-06-15 13:50:00 -0400738 ret = btrfs_readpage(NULL, pinned[1]);
Chris Mason39279cc2007-06-12 06:35:45 -0400739 BUG_ON(ret);
740 wait_on_page_locked(pinned[1]);
741 } else {
742 unlock_page(pinned[1]);
743 }
744 }
745
Chris Mason39279cc2007-06-12 06:35:45 -0400746 while(count > 0) {
747 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
Chris Mason11bd1432007-06-22 14:16:24 -0400748 size_t write_bytes = min(count, nrptrs *
749 (size_t)PAGE_CACHE_SIZE -
Chris Mason8c2383c2007-06-18 09:57:58 -0400750 offset);
Chris Mason39279cc2007-06-12 06:35:45 -0400751 size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
752 PAGE_CACHE_SHIFT;
753
Chris Mason8c2383c2007-06-18 09:57:58 -0400754 WARN_ON(num_pages > nrptrs);
Chris Mason39279cc2007-06-12 06:35:45 -0400755 memset(pages, 0, sizeof(pages));
756 ret = prepare_pages(root, file, pages, num_pages,
757 pos, first_index, last_index,
Chris Mason8c2383c2007-06-18 09:57:58 -0400758 write_bytes);
Chris Mason54aa1f42007-06-22 14:16:25 -0400759 if (ret)
760 goto out;
Chris Mason39279cc2007-06-12 06:35:45 -0400761
Chris Mason39279cc2007-06-12 06:35:45 -0400762 ret = btrfs_copy_from_user(pos, num_pages,
763 write_bytes, pages, buf);
Chris Mason54aa1f42007-06-22 14:16:25 -0400764 if (ret) {
765 btrfs_drop_pages(pages, num_pages);
766 goto out;
767 }
Chris Mason39279cc2007-06-12 06:35:45 -0400768
769 ret = dirty_and_release_pages(NULL, root, file, pages,
770 num_pages, pos, write_bytes);
Chris Mason39279cc2007-06-12 06:35:45 -0400771 btrfs_drop_pages(pages, num_pages);
Chris Mason54aa1f42007-06-22 14:16:25 -0400772 if (ret)
773 goto out;
Chris Mason39279cc2007-06-12 06:35:45 -0400774
775 buf += write_bytes;
776 count -= write_bytes;
777 pos += write_bytes;
778 num_written += write_bytes;
779
Chris Mason8c2383c2007-06-18 09:57:58 -0400780 balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages);
Chris Mason448d6402007-11-27 07:52:01 -0800781 if (num_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
782 btrfs_btree_balance_dirty(root, 1);
Chris Mason39279cc2007-06-12 06:35:45 -0400783 cond_resched();
784 }
Chris Mason39279cc2007-06-12 06:35:45 -0400785 mutex_unlock(&inode->i_mutex);
786out:
Chris Mason8c2383c2007-06-18 09:57:58 -0400787 kfree(pages);
Chris Mason39279cc2007-06-12 06:35:45 -0400788 if (pinned[0])
789 page_cache_release(pinned[0]);
790 if (pinned[1])
791 page_cache_release(pinned[1]);
792 *ppos = pos;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400793
794 if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
795 err = sync_page_range(inode, inode->i_mapping,
796 start_pos, num_written);
797 if (err < 0)
798 num_written = err;
799 }
Chris Mason39279cc2007-06-12 06:35:45 -0400800 current->backing_dev_info = NULL;
Chris Mason39279cc2007-06-12 06:35:45 -0400801 return num_written ? num_written : err;
802}
803
Chris Mason39279cc2007-06-12 06:35:45 -0400804static int btrfs_sync_file(struct file *file,
805 struct dentry *dentry, int datasync)
806{
807 struct inode *inode = dentry->d_inode;
808 struct btrfs_root *root = BTRFS_I(inode)->root;
Josef Bacik15ee9bc2007-08-10 16:22:09 -0400809 int ret = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400810 struct btrfs_trans_handle *trans;
811
812 /*
Josef Bacik15ee9bc2007-08-10 16:22:09 -0400813 * check the transaction that last modified this inode
814 * and see if its already been committed
Chris Mason39279cc2007-06-12 06:35:45 -0400815 */
816 mutex_lock(&root->fs_info->fs_mutex);
Josef Bacik15ee9bc2007-08-10 16:22:09 -0400817 if (!BTRFS_I(inode)->last_trans)
818 goto out;
819 mutex_lock(&root->fs_info->trans_mutex);
820 if (BTRFS_I(inode)->last_trans <=
821 root->fs_info->last_trans_committed) {
822 BTRFS_I(inode)->last_trans = 0;
823 mutex_unlock(&root->fs_info->trans_mutex);
824 goto out;
825 }
826 mutex_unlock(&root->fs_info->trans_mutex);
827
828 /*
Chris Masona52d9a82007-08-27 16:49:44 -0400829 * ok we haven't committed the transaction yet, lets do a commit
830 */
Chris Mason39279cc2007-06-12 06:35:45 -0400831 trans = btrfs_start_transaction(root, 1);
832 if (!trans) {
833 ret = -ENOMEM;
834 goto out;
835 }
836 ret = btrfs_commit_transaction(trans, root);
Chris Mason39279cc2007-06-12 06:35:45 -0400837out:
Josef Bacik15ee9bc2007-08-10 16:22:09 -0400838 mutex_unlock(&root->fs_info->fs_mutex);
Chris Mason39279cc2007-06-12 06:35:45 -0400839 return ret > 0 ? EIO : ret;
840}
841
Chris Mason9ebefb182007-06-15 13:50:00 -0400842static struct vm_operations_struct btrfs_file_vm_ops = {
Chris Mason92fee662007-07-25 12:31:35 -0400843#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
844 .nopage = filemap_nopage,
845 .populate = filemap_populate,
846#else
847 .fault = filemap_fault,
848#endif
Chris Mason9ebefb182007-06-15 13:50:00 -0400849 .page_mkwrite = btrfs_page_mkwrite,
850};
851
852static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
853{
854 vma->vm_ops = &btrfs_file_vm_ops;
855 file_accessed(filp);
856 return 0;
857}
858
Chris Mason39279cc2007-06-12 06:35:45 -0400859struct file_operations btrfs_file_operations = {
860 .llseek = generic_file_llseek,
861 .read = do_sync_read,
Chris Mason9ebefb182007-06-15 13:50:00 -0400862 .aio_read = generic_file_aio_read,
Chris Mason39279cc2007-06-12 06:35:45 -0400863 .write = btrfs_file_write,
Chris Mason9ebefb182007-06-15 13:50:00 -0400864 .mmap = btrfs_file_mmap,
Chris Mason39279cc2007-06-12 06:35:45 -0400865 .open = generic_file_open,
Chris Mason39279cc2007-06-12 06:35:45 -0400866 .fsync = btrfs_sync_file,
Christoph Hellwig34287aa2007-09-14 10:22:47 -0400867 .unlocked_ioctl = btrfs_ioctl,
Chris Mason39279cc2007-06-12 06:35:45 -0400868#ifdef CONFIG_COMPAT
Christoph Hellwig34287aa2007-09-14 10:22:47 -0400869 .compat_ioctl = btrfs_ioctl,
Chris Mason39279cc2007-06-12 06:35:45 -0400870#endif
871};
872