2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
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>
32 #include <linux/version.h>
35 #include "transaction.h"
36 #include "btrfs_inode.h"
37 #include "ordered-data.h"
39 #include "print-tree.h"
42 static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
43 struct page **prepared_pages,
44 const char __user * buf)
48 int offset = pos & (PAGE_CACHE_SIZE - 1);
50 for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
51 size_t count = min_t(size_t,
52 PAGE_CACHE_SIZE - offset, write_bytes);
53 struct page *page = prepared_pages[i];
54 fault_in_pages_readable(buf, count);
56 /* Copy data from userspace to the current page */
58 page_fault = __copy_from_user(page_address(page) + offset,
60 /* Flush processor's dcache for this page */
61 flush_dcache_page(page);
69 return page_fault ? -EFAULT : 0;
72 static void btrfs_drop_pages(struct page **pages, size_t num_pages)
75 for (i = 0; i < num_pages; i++) {
78 unlock_page(pages[i]);
79 mark_page_accessed(pages[i]);
80 page_cache_release(pages[i]);
84 static int noinline insert_inline_extent(struct btrfs_trans_handle *trans,
85 struct btrfs_root *root, struct inode *inode,
86 u64 offset, size_t size,
87 struct page **pages, size_t page_offset,
91 struct btrfs_path *path;
92 struct extent_buffer *leaf;
95 struct btrfs_file_extent_item *ei;
103 path = btrfs_alloc_path();
107 btrfs_set_trans_block_group(trans, inode);
109 key.objectid = inode->i_ino;
111 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
113 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
119 struct btrfs_key found_key;
121 if (path->slots[0] == 0)
125 leaf = path->nodes[0];
126 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
128 if (found_key.objectid != inode->i_ino)
131 if (found_key.type != BTRFS_EXTENT_DATA_KEY)
133 ei = btrfs_item_ptr(leaf, path->slots[0],
134 struct btrfs_file_extent_item);
136 if (btrfs_file_extent_type(leaf, ei) !=
137 BTRFS_FILE_EXTENT_INLINE) {
140 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
147 leaf = path->nodes[0];
148 ei = btrfs_item_ptr(leaf, path->slots[0],
149 struct btrfs_file_extent_item);
151 if (btrfs_file_extent_type(leaf, ei) !=
152 BTRFS_FILE_EXTENT_INLINE) {
154 btrfs_print_leaf(root, leaf);
155 printk("found wasn't inline offset %Lu inode %lu\n",
156 offset, inode->i_ino);
159 found_size = btrfs_file_extent_inline_len(leaf,
160 btrfs_item_nr(leaf, path->slots[0]));
161 found_end = key.offset + found_size;
163 if (found_end < offset + size) {
164 btrfs_release_path(root, path);
165 ret = btrfs_search_slot(trans, root, &key, path,
166 offset + size - found_end, 1);
169 ret = btrfs_extend_item(trans, root, path,
170 offset + size - found_end);
175 leaf = path->nodes[0];
176 ei = btrfs_item_ptr(leaf, path->slots[0],
177 struct btrfs_file_extent_item);
179 if (found_end < offset) {
180 ptr = btrfs_file_extent_inline_start(ei) + found_size;
181 memset_extent_buffer(leaf, 0, ptr, offset - found_end);
185 btrfs_release_path(root, path);
186 datasize = offset + size - key.offset;
187 datasize = btrfs_file_extent_calc_inline_size(datasize);
188 ret = btrfs_insert_empty_item(trans, root, path, &key,
192 printk("got bad ret %d\n", ret);
195 leaf = path->nodes[0];
196 ei = btrfs_item_ptr(leaf, path->slots[0],
197 struct btrfs_file_extent_item);
198 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
199 btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
201 ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset;
207 kaddr = kmap_atomic(page, KM_USER0);
208 cur_size = min_t(size_t, PAGE_CACHE_SIZE - page_offset, size);
209 write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size);
210 kunmap_atomic(kaddr, KM_USER0);
214 if (i >= num_pages) {
215 printk("i %d num_pages %d\n", i, num_pages);
219 btrfs_mark_buffer_dirty(leaf);
221 btrfs_free_path(path);
225 static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
226 struct btrfs_root *root,
235 struct inode *inode = fdentry(file)->d_inode;
236 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
240 u64 end_of_last_block;
241 u64 end_pos = pos + write_bytes;
243 loff_t isize = i_size_read(inode);
245 start_pos = pos & ~((u64)root->sectorsize - 1);
246 num_bytes = (write_bytes + pos - start_pos +
247 root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
249 end_of_last_block = start_pos + num_bytes - 1;
251 lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
252 mutex_lock(&root->fs_info->fs_mutex);
253 trans = btrfs_start_transaction(root, 1);
258 btrfs_set_trans_block_group(trans, inode);
259 inode->i_blocks += num_bytes >> 9;
262 if ((end_of_last_block & 4095) == 0) {
263 printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block);
265 set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
267 /* FIXME...EIEIO, ENOSPC and more */
268 /* insert any holes we need to create */
269 if (isize < end_pos) {
270 u64 last_pos_in_file;
272 u64 mask = root->sectorsize - 1;
273 last_pos_in_file = (isize + mask) & ~mask;
274 hole_size = (end_pos - last_pos_in_file + mask) & ~mask;
275 if (last_pos_in_file < end_pos) {
276 err = btrfs_drop_extents(trans, root, inode,
278 last_pos_in_file + hole_size,
284 err = btrfs_insert_file_extent(trans, root,
288 btrfs_drop_extent_cache(inode, last_pos_in_file,
289 last_pos_in_file + hole_size -1);
290 btrfs_check_file(root, inode);
297 * either allocate an extent for the new bytes or setup the key
298 * to show we are doing inline data in the extent
300 inline_size = end_pos;
301 if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
302 inline_size > root->fs_info->max_inline ||
303 (inline_size & (root->sectorsize -1)) == 0 ||
304 inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
306 u64 existing_delalloc = 0;
308 for (i = 0; i < num_pages; i++) {
309 struct page *p = pages[i];
313 last_end = (u64)(pages[num_pages -1]->index) <<
315 last_end += PAGE_CACHE_SIZE - 1;
316 if (start_pos < isize) {
317 u64 delalloc_start = start_pos;
318 existing_delalloc = count_range_bits(io_tree,
320 end_of_last_block, (u64)-1,
323 set_extent_delalloc(io_tree, start_pos, end_of_last_block,
325 btrfs_add_ordered_inode(inode);
328 /* step one, delete the existing extents in this range */
329 aligned_end = (pos + write_bytes + root->sectorsize - 1) &
330 ~((u64)root->sectorsize - 1);
331 err = btrfs_drop_extents(trans, root, inode, start_pos,
332 aligned_end, aligned_end, &hint_byte);
335 if (isize > inline_size)
336 inline_size = min_t(u64, isize, aligned_end);
337 inline_size -= start_pos;
338 err = insert_inline_extent(trans, root, inode, start_pos,
339 inline_size, pages, 0, num_pages);
340 btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1);
343 if (end_pos > isize) {
344 i_size_write(inode, end_pos);
345 btrfs_update_inode(trans, root, inode);
348 err = btrfs_end_transaction(trans, root);
350 mutex_unlock(&root->fs_info->fs_mutex);
351 unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
355 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
357 struct extent_map *em;
358 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
361 spin_lock(&em_tree->lock);
362 em = lookup_extent_mapping(em_tree, start, end);
364 spin_unlock(&em_tree->lock);
367 remove_extent_mapping(em_tree, em);
368 spin_unlock(&em_tree->lock);
372 /* once for the tree*/
378 int btrfs_check_file(struct btrfs_root *root, struct inode *inode)
382 struct btrfs_path *path;
383 struct btrfs_key found_key;
384 struct extent_buffer *leaf;
385 struct btrfs_file_extent_item *extent;
394 path = btrfs_alloc_path();
395 ret = btrfs_lookup_file_extent(NULL, root, path, inode->i_ino,
398 nritems = btrfs_header_nritems(path->nodes[0]);
399 if (path->slots[0] >= nritems) {
400 ret = btrfs_next_leaf(root, path);
403 nritems = btrfs_header_nritems(path->nodes[0]);
405 slot = path->slots[0];
406 leaf = path->nodes[0];
407 btrfs_item_key_to_cpu(leaf, &found_key, slot);
408 if (found_key.objectid != inode->i_ino)
410 if (found_key.type != BTRFS_EXTENT_DATA_KEY)
413 if (found_key.offset != last_offset) {
415 btrfs_print_leaf(root, leaf);
416 printk("inode %lu found offset %Lu expected %Lu\n",
417 inode->i_ino, found_key.offset, last_offset);
421 extent = btrfs_item_ptr(leaf, slot,
422 struct btrfs_file_extent_item);
423 found_type = btrfs_file_extent_type(leaf, extent);
424 if (found_type == BTRFS_FILE_EXTENT_REG) {
425 extent_end = found_key.offset +
426 btrfs_file_extent_num_bytes(leaf, extent);
427 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
428 struct btrfs_item *item;
429 item = btrfs_item_nr(leaf, slot);
430 extent_end = found_key.offset +
431 btrfs_file_extent_inline_len(leaf, item);
432 extent_end = (extent_end + root->sectorsize - 1) &
433 ~((u64)root->sectorsize -1 );
435 last_offset = extent_end;
438 if (last_offset < inode->i_size) {
440 btrfs_print_leaf(root, leaf);
441 printk("inode %lu found offset %Lu size %Lu\n", inode->i_ino,
442 last_offset, inode->i_size);
447 btrfs_free_path(path);
453 * this is very complex, but the basic idea is to drop all extents
454 * in the range start - end. hint_block is filled in with a block number
455 * that would be a good hint to the block allocator for this file.
457 * If an extent intersects the range but is not entirely inside the range
458 * it is either truncated or split. Anything entirely inside the range
459 * is deleted from the tree.
461 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
462 struct btrfs_root *root, struct inode *inode,
463 u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
466 u64 search_start = start;
467 struct extent_buffer *leaf;
468 struct btrfs_file_extent_item *extent;
469 struct btrfs_path *path;
470 struct btrfs_key key;
471 struct btrfs_file_extent_item old;
481 btrfs_drop_extent_cache(inode, start, end - 1);
483 path = btrfs_alloc_path();
488 btrfs_release_path(root, path);
489 ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
494 if (path->slots[0] == 0) {
506 leaf = path->nodes[0];
507 slot = path->slots[0];
509 btrfs_item_key_to_cpu(leaf, &key, slot);
510 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY &&
514 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
515 key.objectid != inode->i_ino) {
519 search_start = key.offset;
522 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
523 extent = btrfs_item_ptr(leaf, slot,
524 struct btrfs_file_extent_item);
525 found_type = btrfs_file_extent_type(leaf, extent);
526 if (found_type == BTRFS_FILE_EXTENT_REG) {
528 btrfs_file_extent_disk_bytenr(leaf,
531 *hint_byte = extent_end;
533 extent_end = key.offset +
534 btrfs_file_extent_num_bytes(leaf, extent);
536 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
537 struct btrfs_item *item;
538 item = btrfs_item_nr(leaf, slot);
540 extent_end = key.offset +
541 btrfs_file_extent_inline_len(leaf, item);
544 extent_end = search_start;
547 /* we found nothing we can drop */
548 if ((!found_extent && !found_inline) ||
549 search_start >= extent_end) {
552 nritems = btrfs_header_nritems(leaf);
553 if (slot >= nritems - 1) {
554 nextret = btrfs_next_leaf(root, path);
565 u64 mask = root->sectorsize - 1;
566 search_start = (extent_end + mask) & ~mask;
568 search_start = extent_end;
569 if (end <= extent_end && start >= key.offset && found_inline) {
570 *hint_byte = EXTENT_MAP_INLINE;
573 if (end < extent_end && end >= key.offset) {
576 btrfs_file_extent_disk_bytenr(leaf, extent);
578 btrfs_file_extent_disk_num_bytes(leaf,
580 read_extent_buffer(leaf, &old,
581 (unsigned long)extent,
583 if (disk_bytenr != 0) {
584 ret = btrfs_inc_extent_ref(trans, root,
585 disk_bytenr, disk_num_bytes,
586 root->root_key.objectid,
593 if (found_inline && start <= key.offset)
596 /* truncate existing extent */
597 if (start > key.offset) {
601 WARN_ON(start & (root->sectorsize - 1));
603 new_num = start - key.offset;
604 old_num = btrfs_file_extent_num_bytes(leaf,
607 btrfs_file_extent_disk_bytenr(leaf,
609 if (btrfs_file_extent_disk_bytenr(leaf,
612 (old_num - new_num) >> 9;
614 btrfs_set_file_extent_num_bytes(leaf, extent,
616 btrfs_mark_buffer_dirty(leaf);
617 } else if (key.offset < inline_limit &&
618 (end > extent_end) &&
619 (inline_limit < extent_end)) {
621 new_size = btrfs_file_extent_calc_inline_size(
622 inline_limit - key.offset);
623 btrfs_truncate_item(trans, root, path,
627 /* delete the entire extent */
630 u64 disk_num_bytes = 0;
631 u64 extent_num_bytes = 0;
635 root_gen = btrfs_header_generation(leaf);
636 root_owner = btrfs_header_owner(leaf);
639 btrfs_file_extent_disk_bytenr(leaf,
642 btrfs_file_extent_disk_num_bytes(leaf,
645 btrfs_file_extent_num_bytes(leaf, extent);
647 btrfs_file_extent_disk_bytenr(leaf,
650 ret = btrfs_del_item(trans, root, path);
651 /* TODO update progress marker and return */
653 btrfs_release_path(root, path);
655 if (found_extent && disk_bytenr != 0) {
656 inode->i_blocks -= extent_num_bytes >> 9;
657 ret = btrfs_free_extent(trans, root,
661 root_gen, inode->i_ino,
666 if (!bookend && search_start >= end) {
673 if (bookend && found_inline && start <= key.offset) {
675 new_size = btrfs_file_extent_calc_inline_size(
677 btrfs_truncate_item(trans, root, path, new_size, 0);
679 /* create bookend, splitting the extent in two */
680 if (bookend && found_extent) {
681 struct btrfs_key ins;
682 ins.objectid = inode->i_ino;
684 btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
685 btrfs_release_path(root, path);
686 ret = btrfs_insert_empty_item(trans, root, path, &ins,
689 leaf = path->nodes[0];
691 btrfs_print_leaf(root, leaf);
692 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);
695 extent = btrfs_item_ptr(leaf, path->slots[0],
696 struct btrfs_file_extent_item);
697 write_extent_buffer(leaf, &old,
698 (unsigned long)extent, sizeof(old));
700 btrfs_set_file_extent_offset(leaf, extent,
701 le64_to_cpu(old.offset) + end - key.offset);
702 WARN_ON(le64_to_cpu(old.num_bytes) <
704 btrfs_set_file_extent_num_bytes(leaf, extent,
706 btrfs_set_file_extent_type(leaf, extent,
707 BTRFS_FILE_EXTENT_REG);
709 btrfs_mark_buffer_dirty(path->nodes[0]);
710 if (le64_to_cpu(old.disk_bytenr) != 0) {
712 btrfs_file_extent_num_bytes(leaf,
720 btrfs_free_path(path);
725 * this gets pages into the page cache and locks them down
727 static int prepare_pages(struct btrfs_root *root, struct file *file,
728 struct page **pages, size_t num_pages,
729 loff_t pos, unsigned long first_index,
730 unsigned long last_index, size_t write_bytes)
733 unsigned long index = pos >> PAGE_CACHE_SHIFT;
734 struct inode *inode = fdentry(file)->d_inode;
738 start_pos = pos & ~((u64)root->sectorsize - 1);
740 memset(pages, 0, num_pages * sizeof(struct page *));
742 for (i = 0; i < num_pages; i++) {
743 pages[i] = grab_cache_page(inode->i_mapping, index + i);
748 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
749 ClearPageDirty(pages[i]);
751 cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
753 wait_on_page_writeback(pages[i]);
754 set_page_extent_mapped(pages[i]);
755 WARN_ON(!PageLocked(pages[i]));
760 static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
761 size_t count, loff_t *ppos)
765 ssize_t num_written = 0;
768 struct inode *inode = fdentry(file)->d_inode;
769 struct btrfs_root *root = BTRFS_I(inode)->root;
770 struct page **pages = NULL;
772 struct page *pinned[2];
773 unsigned long first_index;
774 unsigned long last_index;
776 nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE,
777 PAGE_CACHE_SIZE / (sizeof(struct page *)));
780 if (file->f_flags & O_DIRECT)
786 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
787 current->backing_dev_info = inode->i_mapping->backing_dev_info;
788 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
793 err = remove_suid(fdentry(file));
796 file_update_time(file);
798 pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
800 mutex_lock(&inode->i_mutex);
801 first_index = pos >> PAGE_CACHE_SHIFT;
802 last_index = (pos + count) >> PAGE_CACHE_SHIFT;
805 * there are lots of better ways to do this, but this code
806 * makes sure the first and last page in the file range are
807 * up to date and ready for cow
809 if ((pos & (PAGE_CACHE_SIZE - 1))) {
810 pinned[0] = grab_cache_page(inode->i_mapping, first_index);
811 if (!PageUptodate(pinned[0])) {
812 ret = btrfs_readpage(NULL, pinned[0]);
814 wait_on_page_locked(pinned[0]);
816 unlock_page(pinned[0]);
819 if ((pos + count) & (PAGE_CACHE_SIZE - 1)) {
820 pinned[1] = grab_cache_page(inode->i_mapping, last_index);
821 if (!PageUptodate(pinned[1])) {
822 ret = btrfs_readpage(NULL, pinned[1]);
824 wait_on_page_locked(pinned[1]);
826 unlock_page(pinned[1]);
831 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
832 size_t write_bytes = min(count, nrptrs *
833 (size_t)PAGE_CACHE_SIZE -
835 size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
838 WARN_ON(num_pages > nrptrs);
839 memset(pages, 0, sizeof(pages));
841 mutex_lock(&root->fs_info->fs_mutex);
842 ret = btrfs_check_free_space(root, write_bytes, 0);
843 mutex_unlock(&root->fs_info->fs_mutex);
847 ret = prepare_pages(root, file, pages, num_pages,
848 pos, first_index, last_index,
853 ret = btrfs_copy_from_user(pos, num_pages,
854 write_bytes, pages, buf);
856 btrfs_drop_pages(pages, num_pages);
860 ret = dirty_and_release_pages(NULL, root, file, pages,
861 num_pages, pos, write_bytes);
862 btrfs_drop_pages(pages, num_pages);
867 count -= write_bytes;
869 num_written += write_bytes;
871 balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages);
872 if (num_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
873 btrfs_btree_balance_dirty(root, 1);
874 btrfs_throttle(root);
878 mutex_unlock(&inode->i_mutex);
883 page_cache_release(pinned[0]);
885 page_cache_release(pinned[1]);
888 if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
889 err = sync_page_range(inode, inode->i_mapping,
890 start_pos, num_written);
894 current->backing_dev_info = NULL;
895 return num_written ? num_written : err;
898 static int btrfs_sync_file(struct file *file,
899 struct dentry *dentry, int datasync)
901 struct inode *inode = dentry->d_inode;
902 struct btrfs_root *root = BTRFS_I(inode)->root;
904 struct btrfs_trans_handle *trans;
907 * check the transaction that last modified this inode
908 * and see if its already been committed
910 mutex_lock(&root->fs_info->fs_mutex);
911 if (!BTRFS_I(inode)->last_trans)
913 mutex_lock(&root->fs_info->trans_mutex);
914 if (BTRFS_I(inode)->last_trans <=
915 root->fs_info->last_trans_committed) {
916 BTRFS_I(inode)->last_trans = 0;
917 mutex_unlock(&root->fs_info->trans_mutex);
920 mutex_unlock(&root->fs_info->trans_mutex);
923 * ok we haven't committed the transaction yet, lets do a commit
925 trans = btrfs_start_transaction(root, 1);
930 ret = btrfs_commit_transaction(trans, root);
932 mutex_unlock(&root->fs_info->fs_mutex);
933 return ret > 0 ? EIO : ret;
936 static struct vm_operations_struct btrfs_file_vm_ops = {
937 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
938 .nopage = filemap_nopage,
939 .populate = filemap_populate,
941 .fault = filemap_fault,
943 .page_mkwrite = btrfs_page_mkwrite,
946 static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
948 vma->vm_ops = &btrfs_file_vm_ops;
953 struct file_operations btrfs_file_operations = {
954 .llseek = generic_file_llseek,
955 .read = do_sync_read,
956 .aio_read = generic_file_aio_read,
957 .splice_read = generic_file_splice_read,
958 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
959 .sendfile = generic_file_sendfile,
961 .write = btrfs_file_write,
962 .mmap = btrfs_file_mmap,
963 .open = generic_file_open,
964 .fsync = btrfs_sync_file,
965 .unlocked_ioctl = btrfs_ioctl,
967 .compat_ioctl = btrfs_ioctl,