blob: d3f2fe0b7c6cef6d8ca1466d8b7e7156f1a40998 [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"
Jeff Mahoney12fa8ec2008-05-02 15:03:58 -040039#include "compat.h"
Chris Mason39279cc2007-06-12 06:35:45 -040040
41
42static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
43 struct page **prepared_pages,
44 const char __user * buf)
45{
46 long page_fault = 0;
47 int i;
48 int offset = pos & (PAGE_CACHE_SIZE - 1);
49
50 for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
51 size_t count = min_t(size_t,
52 PAGE_CACHE_SIZE - offset, write_bytes);
53 struct page *page = prepared_pages[i];
54 fault_in_pages_readable(buf, count);
55
56 /* Copy data from userspace to the current page */
57 kmap(page);
58 page_fault = __copy_from_user(page_address(page) + offset,
59 buf, count);
60 /* Flush processor's dcache for this page */
61 flush_dcache_page(page);
62 kunmap(page);
63 buf += count;
64 write_bytes -= count;
65
66 if (page_fault)
67 break;
68 }
69 return page_fault ? -EFAULT : 0;
70}
71
72static void btrfs_drop_pages(struct page **pages, size_t num_pages)
73{
74 size_t i;
75 for (i = 0; i < num_pages; i++) {
76 if (!pages[i])
77 break;
Chris Mason4a096752008-07-21 10:29:44 -040078 ClearPageChecked(pages[i]);
Chris Mason39279cc2007-06-12 06:35:45 -040079 unlock_page(pages[i]);
80 mark_page_accessed(pages[i]);
81 page_cache_release(pages[i]);
82 }
83}
84
Chris Mason98ed5172008-01-03 10:01:48 -050085static int noinline insert_inline_extent(struct btrfs_trans_handle *trans,
Chris Masona52d9a82007-08-27 16:49:44 -040086 struct btrfs_root *root, struct inode *inode,
Chris Mason3326d1b2007-10-15 16:18:25 -040087 u64 offset, size_t size,
88 struct page **pages, size_t page_offset,
89 int num_pages)
Chris Mason54aa1f42007-06-22 14:16:25 -040090{
91 struct btrfs_key key;
92 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -040093 struct extent_buffer *leaf;
94 char *kaddr;
95 unsigned long ptr;
Chris Mason54aa1f42007-06-22 14:16:25 -040096 struct btrfs_file_extent_item *ei;
Chris Mason3326d1b2007-10-15 16:18:25 -040097 struct page *page;
Chris Mason54aa1f42007-06-22 14:16:25 -040098 u32 datasize;
99 int err = 0;
100 int ret;
Chris Mason3326d1b2007-10-15 16:18:25 -0400101 int i;
102 ssize_t cur_size;
Chris Mason54aa1f42007-06-22 14:16:25 -0400103
104 path = btrfs_alloc_path();
105 if (!path)
106 return -ENOMEM;
107
Chris Mason54aa1f42007-06-22 14:16:25 -0400108 btrfs_set_trans_block_group(trans, inode);
109
110 key.objectid = inode->i_ino;
111 key.offset = offset;
Chris Mason54aa1f42007-06-22 14:16:25 -0400112 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
Chris Mason54aa1f42007-06-22 14:16:25 -0400113
Chris Mason3326d1b2007-10-15 16:18:25 -0400114 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
115 if (ret < 0) {
Chris Mason54aa1f42007-06-22 14:16:25 -0400116 err = ret;
117 goto fail;
118 }
Chris Mason3326d1b2007-10-15 16:18:25 -0400119 if (ret == 1) {
Chris Mason179e29e2007-11-01 11:28:41 -0400120 struct btrfs_key found_key;
121
122 if (path->slots[0] == 0)
123 goto insert;
124
Chris Mason3326d1b2007-10-15 16:18:25 -0400125 path->slots[0]--;
126 leaf = path->nodes[0];
Chris Mason179e29e2007-11-01 11:28:41 -0400127 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
128
129 if (found_key.objectid != inode->i_ino)
130 goto insert;
131
132 if (found_key.type != BTRFS_EXTENT_DATA_KEY)
133 goto insert;
Chris Mason3326d1b2007-10-15 16:18:25 -0400134 ei = btrfs_item_ptr(leaf, path->slots[0],
135 struct btrfs_file_extent_item);
Chris Mason54aa1f42007-06-22 14:16:25 -0400136
Chris Mason3326d1b2007-10-15 16:18:25 -0400137 if (btrfs_file_extent_type(leaf, ei) !=
138 BTRFS_FILE_EXTENT_INLINE) {
139 goto insert;
140 }
141 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
142 ret = 0;
143 }
144 if (ret == 0) {
145 u32 found_size;
Yan18f16f72007-10-25 15:42:57 -0400146 u64 found_end;
Chris Mason3326d1b2007-10-15 16:18:25 -0400147
148 leaf = path->nodes[0];
149 ei = btrfs_item_ptr(leaf, path->slots[0],
150 struct btrfs_file_extent_item);
151
152 if (btrfs_file_extent_type(leaf, ei) !=
153 BTRFS_FILE_EXTENT_INLINE) {
154 err = ret;
155 btrfs_print_leaf(root, leaf);
156 printk("found wasn't inline offset %Lu inode %lu\n",
157 offset, inode->i_ino);
158 goto fail;
159 }
Chris Mason3326d1b2007-10-15 16:18:25 -0400160 found_size = btrfs_file_extent_inline_len(leaf,
161 btrfs_item_nr(leaf, path->slots[0]));
Yan18f16f72007-10-25 15:42:57 -0400162 found_end = key.offset + found_size;
Chris Mason3326d1b2007-10-15 16:18:25 -0400163
Yan18f16f72007-10-25 15:42:57 -0400164 if (found_end < offset + size) {
Chris Mason3326d1b2007-10-15 16:18:25 -0400165 btrfs_release_path(root, path);
166 ret = btrfs_search_slot(trans, root, &key, path,
Yan18f16f72007-10-25 15:42:57 -0400167 offset + size - found_end, 1);
Chris Mason3326d1b2007-10-15 16:18:25 -0400168 BUG_ON(ret != 0);
Chris Mason179e29e2007-11-01 11:28:41 -0400169
Chris Mason3326d1b2007-10-15 16:18:25 -0400170 ret = btrfs_extend_item(trans, root, path,
Yan18f16f72007-10-25 15:42:57 -0400171 offset + size - found_end);
Chris Mason3326d1b2007-10-15 16:18:25 -0400172 if (ret) {
173 err = ret;
174 goto fail;
175 }
176 leaf = path->nodes[0];
177 ei = btrfs_item_ptr(leaf, path->slots[0],
178 struct btrfs_file_extent_item);
Chris Mason90692182008-02-08 13:49:28 -0500179 inode->i_blocks += (offset + size - found_end) >> 9;
Chris Mason3326d1b2007-10-15 16:18:25 -0400180 }
Yan18f16f72007-10-25 15:42:57 -0400181 if (found_end < offset) {
182 ptr = btrfs_file_extent_inline_start(ei) + found_size;
183 memset_extent_buffer(leaf, 0, ptr, offset - found_end);
184 }
Chris Mason3326d1b2007-10-15 16:18:25 -0400185 } else {
186insert:
187 btrfs_release_path(root, path);
Yan18f16f72007-10-25 15:42:57 -0400188 datasize = offset + size - key.offset;
Chris Mason90692182008-02-08 13:49:28 -0500189 inode->i_blocks += datasize >> 9;
Yan18f16f72007-10-25 15:42:57 -0400190 datasize = btrfs_file_extent_calc_inline_size(datasize);
Chris Mason3326d1b2007-10-15 16:18:25 -0400191 ret = btrfs_insert_empty_item(trans, root, path, &key,
192 datasize);
193 if (ret) {
194 err = ret;
195 printk("got bad ret %d\n", ret);
196 goto fail;
197 }
198 leaf = path->nodes[0];
199 ei = btrfs_item_ptr(leaf, path->slots[0],
200 struct btrfs_file_extent_item);
201 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
202 btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
203 }
Yan18f16f72007-10-25 15:42:57 -0400204 ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset;
Chris Mason3326d1b2007-10-15 16:18:25 -0400205
206 cur_size = size;
207 i = 0;
208 while (size > 0) {
209 page = pages[i];
210 kaddr = kmap_atomic(page, KM_USER0);
Jens Axboeae2f5412007-10-19 09:22:59 -0400211 cur_size = min_t(size_t, PAGE_CACHE_SIZE - page_offset, size);
Chris Mason3326d1b2007-10-15 16:18:25 -0400212 write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size);
213 kunmap_atomic(kaddr, KM_USER0);
214 page_offset = 0;
215 ptr += cur_size;
216 size -= cur_size;
217 if (i >= num_pages) {
218 printk("i %d num_pages %d\n", i, num_pages);
219 }
220 i++;
221 }
Chris Mason5f39d392007-10-15 16:14:19 -0400222 btrfs_mark_buffer_dirty(leaf);
Chris Mason54aa1f42007-06-22 14:16:25 -0400223fail:
224 btrfs_free_path(path);
Chris Mason54aa1f42007-06-22 14:16:25 -0400225 return err;
226}
227
Chris Mason98ed5172008-01-03 10:01:48 -0500228static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
Chris Mason39279cc2007-06-12 06:35:45 -0400229 struct btrfs_root *root,
230 struct file *file,
231 struct page **pages,
232 size_t num_pages,
233 loff_t pos,
234 size_t write_bytes)
235{
Chris Mason39279cc2007-06-12 06:35:45 -0400236 int err = 0;
Chris Masona52d9a82007-08-27 16:49:44 -0400237 int i;
Chris Mason6da6aba2007-12-18 16:15:09 -0500238 struct inode *inode = fdentry(file)->d_inode;
Chris Masond1310b22008-01-24 16:13:08 -0500239 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
Chris Masondb945352007-10-15 16:15:53 -0400240 u64 hint_byte;
241 u64 num_bytes;
Chris Masona52d9a82007-08-27 16:49:44 -0400242 u64 start_pos;
243 u64 end_of_last_block;
244 u64 end_pos = pos + write_bytes;
Yandcfec0d2007-11-06 10:26:26 -0500245 u64 inline_size;
Chris Masonee6e6502008-07-17 12:54:40 -0400246 int did_inline = 0;
Chris Masona52d9a82007-08-27 16:49:44 -0400247 loff_t isize = i_size_read(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400248
Chris Mason5f39d392007-10-15 16:14:19 -0400249 start_pos = pos & ~((u64)root->sectorsize - 1);
Chris Masondb945352007-10-15 16:15:53 -0400250 num_bytes = (write_bytes + pos - start_pos +
251 root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
Chris Mason39279cc2007-06-12 06:35:45 -0400252
Chris Masondb945352007-10-15 16:15:53 -0400253 end_of_last_block = start_pos + num_bytes - 1;
254
Chris Masond1310b22008-01-24 16:13:08 -0500255 lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
Chris Mason37d1aee2008-07-31 10:48:37 -0400256 trans = btrfs_join_transaction(root, 1);
Chris Masona52d9a82007-08-27 16:49:44 -0400257 if (!trans) {
258 err = -ENOMEM;
259 goto out_unlock;
260 }
261 btrfs_set_trans_block_group(trans, inode);
Chris Masondb945352007-10-15 16:15:53 -0400262 hint_byte = 0;
Chris Masona52d9a82007-08-27 16:49:44 -0400263
264 if ((end_of_last_block & 4095) == 0) {
Christoph Hellwig94330632007-09-10 20:02:22 -0400265 printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block);
Chris Masona52d9a82007-08-27 16:49:44 -0400266 }
Chris Masond1310b22008-01-24 16:13:08 -0500267 set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
Chris Masona52d9a82007-08-27 16:49:44 -0400268
269 /* FIXME...EIEIO, ENOSPC and more */
Chris Masona52d9a82007-08-27 16:49:44 -0400270 /* insert any holes we need to create */
Chris Mason1b1e2132008-06-25 16:01:31 -0400271 if (isize < start_pos) {
Chris Masona52d9a82007-08-27 16:49:44 -0400272 u64 last_pos_in_file;
273 u64 hole_size;
Chris Mason5f39d392007-10-15 16:14:19 -0400274 u64 mask = root->sectorsize - 1;
Chris Masona52d9a82007-08-27 16:49:44 -0400275 last_pos_in_file = (isize + mask) & ~mask;
Chris Mason1b1e2132008-06-25 16:01:31 -0400276 hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400277 if (hole_size > 0) {
278 btrfs_wait_ordered_range(inode, last_pos_in_file,
279 last_pos_in_file + hole_size);
Chris Masonee6e6502008-07-17 12:54:40 -0400280 mutex_lock(&BTRFS_I(inode)->extent_mutex);
Chris Mason2bf5a722007-08-30 11:54:02 -0400281 err = btrfs_drop_extents(trans, root, inode,
282 last_pos_in_file,
283 last_pos_in_file + hole_size,
Chris Mason3326d1b2007-10-15 16:18:25 -0400284 last_pos_in_file,
Chris Masondb945352007-10-15 16:15:53 -0400285 &hint_byte);
Chris Mason2bf5a722007-08-30 11:54:02 -0400286 if (err)
287 goto failed;
288
Chris Masona52d9a82007-08-27 16:49:44 -0400289 err = btrfs_insert_file_extent(trans, root,
290 inode->i_ino,
291 last_pos_in_file,
Sage Weilf2eb0a22008-05-02 14:43:14 -0400292 0, 0, hole_size, 0);
Chris Masond1310b22008-01-24 16:13:08 -0500293 btrfs_drop_extent_cache(inode, last_pos_in_file,
294 last_pos_in_file + hole_size -1);
Chris Masonee6e6502008-07-17 12:54:40 -0400295 mutex_unlock(&BTRFS_I(inode)->extent_mutex);
Chris Mason5f564062008-01-22 16:47:59 -0500296 btrfs_check_file(root, inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400297 }
Chris Masona52d9a82007-08-27 16:49:44 -0400298 if (err)
299 goto failed;
300 }
301
302 /*
303 * either allocate an extent for the new bytes or setup the key
304 * to show we are doing inline data in the extent
305 */
Chris Mason3326d1b2007-10-15 16:18:25 -0400306 inline_size = end_pos;
307 if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
Chris Mason6f568d32008-01-29 16:03:38 -0500308 inline_size > root->fs_info->max_inline ||
309 (inline_size & (root->sectorsize -1)) == 0 ||
Chris Mason3326d1b2007-10-15 16:18:25 -0400310 inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
Chris Masone6dcd2d2008-07-17 12:53:50 -0400311 /* check for reserved extents on each page, we don't want
312 * to reset the delalloc bit on things that already have
313 * extents reserved.
314 */
315 set_extent_delalloc(io_tree, start_pos,
316 end_of_last_block, GFP_NOFS);
Chris Masona52d9a82007-08-27 16:49:44 -0400317 for (i = 0; i < num_pages; i++) {
318 struct page *p = pages[i];
319 SetPageUptodate(p);
Chris Mason247e7432008-07-17 12:53:51 -0400320 ClearPageChecked(p);
Chris Masonb888db22007-08-27 16:49:44 -0400321 set_page_dirty(p);
Chris Masona52d9a82007-08-27 16:49:44 -0400322 }
323 } else {
Chris Mason3326d1b2007-10-15 16:18:25 -0400324 u64 aligned_end;
Chris Masonb888db22007-08-27 16:49:44 -0400325 /* step one, delete the existing extents in this range */
Chris Mason3326d1b2007-10-15 16:18:25 -0400326 aligned_end = (pos + write_bytes + root->sectorsize - 1) &
327 ~((u64)root->sectorsize - 1);
Chris Masonee6e6502008-07-17 12:54:40 -0400328 mutex_lock(&BTRFS_I(inode)->extent_mutex);
Chris Mason2bf5a722007-08-30 11:54:02 -0400329 err = btrfs_drop_extents(trans, root, inode, start_pos,
Chris Mason179e29e2007-11-01 11:28:41 -0400330 aligned_end, aligned_end, &hint_byte);
Chris Mason2bf5a722007-08-30 11:54:02 -0400331 if (err)
332 goto failed;
Yandcfec0d2007-11-06 10:26:26 -0500333 if (isize > inline_size)
334 inline_size = min_t(u64, isize, aligned_end);
335 inline_size -= start_pos;
Chris Masona52d9a82007-08-27 16:49:44 -0400336 err = insert_inline_extent(trans, root, inode, start_pos,
Yandcfec0d2007-11-06 10:26:26 -0500337 inline_size, pages, 0, num_pages);
Chris Masond1310b22008-01-24 16:13:08 -0500338 btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1);
Chris Masona52d9a82007-08-27 16:49:44 -0400339 BUG_ON(err);
Chris Masonee6e6502008-07-17 12:54:40 -0400340 mutex_unlock(&BTRFS_I(inode)->extent_mutex);
341 did_inline = 1;
Chris Masona52d9a82007-08-27 16:49:44 -0400342 }
343 if (end_pos > isize) {
344 i_size_write(inode, end_pos);
Chris Masonee6e6502008-07-17 12:54:40 -0400345 if (did_inline)
346 BTRFS_I(inode)->disk_i_size = end_pos;
Chris Masona52d9a82007-08-27 16:49:44 -0400347 btrfs_update_inode(trans, root, inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400348 }
349failed:
Chris Mason017e5362008-07-28 15:32:51 -0400350 err = btrfs_end_transaction(trans, root);
Chris Masona52d9a82007-08-27 16:49:44 -0400351out_unlock:
Chris Masond1310b22008-01-24 16:13:08 -0500352 unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
Chris Mason39279cc2007-06-12 06:35:45 -0400353 return err;
354}
355
Chris Masona52d9a82007-08-27 16:49:44 -0400356int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
357{
358 struct extent_map *em;
Chris Mason3b951512008-04-17 11:29:12 -0400359 struct extent_map *split = NULL;
360 struct extent_map *split2 = NULL;
Chris Masona52d9a82007-08-27 16:49:44 -0400361 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
Yan39b56372008-02-15 10:40:50 -0500362 u64 len = end - start + 1;
Chris Mason3b951512008-04-17 11:29:12 -0400363 int ret;
364 int testend = 1;
Chris Masona52d9a82007-08-27 16:49:44 -0400365
Chris Masone6dcd2d2008-07-17 12:53:50 -0400366 WARN_ON(end < start);
Chris Mason3b951512008-04-17 11:29:12 -0400367 if (end == (u64)-1) {
Yan39b56372008-02-15 10:40:50 -0500368 len = (u64)-1;
Chris Mason3b951512008-04-17 11:29:12 -0400369 testend = 0;
370 }
Chris Masona52d9a82007-08-27 16:49:44 -0400371 while(1) {
Chris Mason3b951512008-04-17 11:29:12 -0400372 if (!split)
373 split = alloc_extent_map(GFP_NOFS);
374 if (!split2)
375 split2 = alloc_extent_map(GFP_NOFS);
376
Chris Masond1310b22008-01-24 16:13:08 -0500377 spin_lock(&em_tree->lock);
Yan39b56372008-02-15 10:40:50 -0500378 em = lookup_extent_mapping(em_tree, start, len);
Chris Masond1310b22008-01-24 16:13:08 -0500379 if (!em) {
380 spin_unlock(&em_tree->lock);
Chris Masona52d9a82007-08-27 16:49:44 -0400381 break;
Chris Masond1310b22008-01-24 16:13:08 -0500382 }
Chris Mason7f3c74f2008-07-18 12:01:11 -0400383 if (test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
Chris Masonf4219502008-07-22 11:18:09 -0400384 printk(KERN_CRIT "inode %lu trying to drop pinned "
385 "extent start %llu end %llu, em [%llu %llu]\n",
386 inode->i_ino,
387 (unsigned long long)start,
388 (unsigned long long)end,
389 (unsigned long long)em->start,
390 (unsigned long long)em->len);
Chris Mason7f3c74f2008-07-18 12:01:11 -0400391 }
Chris Masona52d9a82007-08-27 16:49:44 -0400392 remove_extent_mapping(em_tree, em);
Chris Mason3b951512008-04-17 11:29:12 -0400393
394 if (em->block_start < EXTENT_MAP_LAST_BYTE &&
395 em->start < start) {
396 split->start = em->start;
397 split->len = start - em->start;
398 split->block_start = em->block_start;
399 split->bdev = em->bdev;
400 split->flags = em->flags;
401 ret = add_extent_mapping(em_tree, split);
402 BUG_ON(ret);
403 free_extent_map(split);
404 split = split2;
405 split2 = NULL;
406 }
407 if (em->block_start < EXTENT_MAP_LAST_BYTE &&
408 testend && em->start + em->len > start + len) {
409 u64 diff = start + len - em->start;
410
411 split->start = start + len;
412 split->len = em->start + em->len - (start + len);
413 split->bdev = em->bdev;
414 split->flags = em->flags;
415
416 split->block_start = em->block_start + diff;
417
418 ret = add_extent_mapping(em_tree, split);
419 BUG_ON(ret);
420 free_extent_map(split);
421 split = NULL;
422 }
Chris Masond1310b22008-01-24 16:13:08 -0500423 spin_unlock(&em_tree->lock);
424
Chris Masona52d9a82007-08-27 16:49:44 -0400425 /* once for us */
426 free_extent_map(em);
427 /* once for the tree*/
428 free_extent_map(em);
429 }
Chris Mason3b951512008-04-17 11:29:12 -0400430 if (split)
431 free_extent_map(split);
432 if (split2)
433 free_extent_map(split2);
Chris Masona52d9a82007-08-27 16:49:44 -0400434 return 0;
435}
436
Chris Mason5f564062008-01-22 16:47:59 -0500437int btrfs_check_file(struct btrfs_root *root, struct inode *inode)
438{
439 return 0;
440#if 0
441 struct btrfs_path *path;
442 struct btrfs_key found_key;
443 struct extent_buffer *leaf;
444 struct btrfs_file_extent_item *extent;
445 u64 last_offset = 0;
446 int nritems;
447 int slot;
448 int found_type;
449 int ret;
450 int err = 0;
451 u64 extent_end = 0;
452
453 path = btrfs_alloc_path();
454 ret = btrfs_lookup_file_extent(NULL, root, path, inode->i_ino,
455 last_offset, 0);
456 while(1) {
457 nritems = btrfs_header_nritems(path->nodes[0]);
458 if (path->slots[0] >= nritems) {
459 ret = btrfs_next_leaf(root, path);
460 if (ret)
461 goto out;
462 nritems = btrfs_header_nritems(path->nodes[0]);
463 }
464 slot = path->slots[0];
465 leaf = path->nodes[0];
466 btrfs_item_key_to_cpu(leaf, &found_key, slot);
467 if (found_key.objectid != inode->i_ino)
468 break;
469 if (found_key.type != BTRFS_EXTENT_DATA_KEY)
470 goto out;
471
Chris Mason90692182008-02-08 13:49:28 -0500472 if (found_key.offset < last_offset) {
Chris Mason5f564062008-01-22 16:47:59 -0500473 WARN_ON(1);
474 btrfs_print_leaf(root, leaf);
475 printk("inode %lu found offset %Lu expected %Lu\n",
476 inode->i_ino, found_key.offset, last_offset);
477 err = 1;
478 goto out;
479 }
480 extent = btrfs_item_ptr(leaf, slot,
481 struct btrfs_file_extent_item);
482 found_type = btrfs_file_extent_type(leaf, extent);
483 if (found_type == BTRFS_FILE_EXTENT_REG) {
484 extent_end = found_key.offset +
485 btrfs_file_extent_num_bytes(leaf, extent);
486 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
487 struct btrfs_item *item;
488 item = btrfs_item_nr(leaf, slot);
489 extent_end = found_key.offset +
490 btrfs_file_extent_inline_len(leaf, item);
491 extent_end = (extent_end + root->sectorsize - 1) &
492 ~((u64)root->sectorsize -1 );
493 }
494 last_offset = extent_end;
495 path->slots[0]++;
496 }
Chris Mason90692182008-02-08 13:49:28 -0500497 if (0 && last_offset < inode->i_size) {
Chris Mason5f564062008-01-22 16:47:59 -0500498 WARN_ON(1);
499 btrfs_print_leaf(root, leaf);
500 printk("inode %lu found offset %Lu size %Lu\n", inode->i_ino,
501 last_offset, inode->i_size);
502 err = 1;
503
504 }
505out:
506 btrfs_free_path(path);
507 return err;
508#endif
509}
510
Chris Mason39279cc2007-06-12 06:35:45 -0400511/*
512 * this is very complex, but the basic idea is to drop all extents
513 * in the range start - end. hint_block is filled in with a block number
514 * that would be a good hint to the block allocator for this file.
515 *
516 * If an extent intersects the range but is not entirely inside the range
517 * it is either truncated or split. Anything entirely inside the range
518 * is deleted from the tree.
519 */
520int btrfs_drop_extents(struct btrfs_trans_handle *trans,
521 struct btrfs_root *root, struct inode *inode,
Chris Mason00f5c792007-11-30 10:09:33 -0500522 u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
Chris Mason39279cc2007-06-12 06:35:45 -0400523{
Chris Mason39279cc2007-06-12 06:35:45 -0400524 u64 extent_end = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400525 u64 search_start = start;
Chris Mason00f5c792007-11-30 10:09:33 -0500526 struct extent_buffer *leaf;
527 struct btrfs_file_extent_item *extent;
528 struct btrfs_path *path;
529 struct btrfs_key key;
530 struct btrfs_file_extent_item old;
531 int keep;
532 int slot;
Chris Mason39279cc2007-06-12 06:35:45 -0400533 int bookend;
534 int found_type;
535 int found_extent;
536 int found_inline;
Chris Masonccd467d2007-06-28 15:57:36 -0400537 int recow;
Chris Mason00f5c792007-11-30 10:09:33 -0500538 int ret;
Chris Mason39279cc2007-06-12 06:35:45 -0400539
Chris Masona52d9a82007-08-27 16:49:44 -0400540 btrfs_drop_extent_cache(inode, start, end - 1);
541
Chris Mason39279cc2007-06-12 06:35:45 -0400542 path = btrfs_alloc_path();
543 if (!path)
544 return -ENOMEM;
545 while(1) {
Chris Masonccd467d2007-06-28 15:57:36 -0400546 recow = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400547 btrfs_release_path(root, path);
548 ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
549 search_start, -1);
550 if (ret < 0)
551 goto out;
552 if (ret > 0) {
553 if (path->slots[0] == 0) {
554 ret = 0;
555 goto out;
556 }
557 path->slots[0]--;
558 }
Chris Mason8c2383c2007-06-18 09:57:58 -0400559next_slot:
Chris Mason39279cc2007-06-12 06:35:45 -0400560 keep = 0;
561 bookend = 0;
562 found_extent = 0;
563 found_inline = 0;
564 extent = NULL;
Chris Mason5f39d392007-10-15 16:14:19 -0400565 leaf = path->nodes[0];
Chris Mason39279cc2007-06-12 06:35:45 -0400566 slot = path->slots[0];
Chris Mason8c2383c2007-06-18 09:57:58 -0400567 ret = 0;
Chris Mason5f39d392007-10-15 16:14:19 -0400568 btrfs_item_key_to_cpu(leaf, &key, slot);
Yan72610092008-02-05 15:40:36 -0500569 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY &&
570 key.offset >= end) {
Chris Mason39279cc2007-06-12 06:35:45 -0400571 goto out;
572 }
Yan72610092008-02-05 15:40:36 -0500573 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
574 key.objectid != inode->i_ino) {
Chris Mason39279cc2007-06-12 06:35:45 -0400575 goto out;
576 }
Chris Masonccd467d2007-06-28 15:57:36 -0400577 if (recow) {
578 search_start = key.offset;
579 continue;
580 }
Chris Mason8c2383c2007-06-18 09:57:58 -0400581 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
582 extent = btrfs_item_ptr(leaf, slot,
583 struct btrfs_file_extent_item);
Chris Mason5f39d392007-10-15 16:14:19 -0400584 found_type = btrfs_file_extent_type(leaf, extent);
Chris Mason8c2383c2007-06-18 09:57:58 -0400585 if (found_type == BTRFS_FILE_EXTENT_REG) {
Chris Mason257d0ce2007-11-07 21:08:16 -0500586 extent_end =
587 btrfs_file_extent_disk_bytenr(leaf,
588 extent);
589 if (extent_end)
590 *hint_byte = extent_end;
591
Chris Mason8c2383c2007-06-18 09:57:58 -0400592 extent_end = key.offset +
Chris Masondb945352007-10-15 16:15:53 -0400593 btrfs_file_extent_num_bytes(leaf, extent);
Chris Mason8c2383c2007-06-18 09:57:58 -0400594 found_extent = 1;
595 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
Chris Mason5f39d392007-10-15 16:14:19 -0400596 struct btrfs_item *item;
597 item = btrfs_item_nr(leaf, slot);
Chris Mason8c2383c2007-06-18 09:57:58 -0400598 found_inline = 1;
599 extent_end = key.offset +
Chris Mason5f39d392007-10-15 16:14:19 -0400600 btrfs_file_extent_inline_len(leaf, item);
Chris Mason8c2383c2007-06-18 09:57:58 -0400601 }
602 } else {
603 extent_end = search_start;
Chris Mason39279cc2007-06-12 06:35:45 -0400604 }
605
606 /* we found nothing we can drop */
Chris Mason8c2383c2007-06-18 09:57:58 -0400607 if ((!found_extent && !found_inline) ||
608 search_start >= extent_end) {
609 int nextret;
610 u32 nritems;
Chris Mason5f39d392007-10-15 16:14:19 -0400611 nritems = btrfs_header_nritems(leaf);
Chris Mason8c2383c2007-06-18 09:57:58 -0400612 if (slot >= nritems - 1) {
613 nextret = btrfs_next_leaf(root, path);
614 if (nextret)
615 goto out;
Chris Masonccd467d2007-06-28 15:57:36 -0400616 recow = 1;
Chris Mason8c2383c2007-06-18 09:57:58 -0400617 } else {
618 path->slots[0]++;
619 }
620 goto next_slot;
Chris Mason39279cc2007-06-12 06:35:45 -0400621 }
622
Chris Mason39279cc2007-06-12 06:35:45 -0400623 if (found_inline) {
Chris Mason5f39d392007-10-15 16:14:19 -0400624 u64 mask = root->sectorsize - 1;
Chris Mason39279cc2007-06-12 06:35:45 -0400625 search_start = (extent_end + mask) & ~mask;
626 } else
627 search_start = extent_end;
Yan6e3b9662007-12-14 11:14:42 -0500628 if (end <= extent_end && start >= key.offset && found_inline) {
Chris Mason179e29e2007-11-01 11:28:41 -0400629 *hint_byte = EXTENT_MAP_INLINE;
Yan6e3b9662007-12-14 11:14:42 -0500630 continue;
Chris Mason179e29e2007-11-01 11:28:41 -0400631 }
Chris Mason39279cc2007-06-12 06:35:45 -0400632 if (end < extent_end && end >= key.offset) {
633 if (found_extent) {
Chris Masondb945352007-10-15 16:15:53 -0400634 u64 disk_bytenr =
635 btrfs_file_extent_disk_bytenr(leaf, extent);
636 u64 disk_num_bytes =
637 btrfs_file_extent_disk_num_bytes(leaf,
Chris Mason5f39d392007-10-15 16:14:19 -0400638 extent);
639 read_extent_buffer(leaf, &old,
640 (unsigned long)extent,
641 sizeof(old));
Chris Masondb945352007-10-15 16:15:53 -0400642 if (disk_bytenr != 0) {
Chris Mason39279cc2007-06-12 06:35:45 -0400643 ret = btrfs_inc_extent_ref(trans, root,
Chris Mason7bb86312007-12-11 09:25:06 -0500644 disk_bytenr, disk_num_bytes,
645 root->root_key.objectid,
646 trans->transid,
647 key.objectid, end);
Chris Mason39279cc2007-06-12 06:35:45 -0400648 BUG_ON(ret);
649 }
650 }
Chris Mason179e29e2007-11-01 11:28:41 -0400651 bookend = 1;
Yan0181e582008-01-30 14:39:54 -0500652 if (found_inline && start <= key.offset)
Chris Mason179e29e2007-11-01 11:28:41 -0400653 keep = 1;
Chris Mason39279cc2007-06-12 06:35:45 -0400654 }
Chris Mason39279cc2007-06-12 06:35:45 -0400655 /* truncate existing extent */
656 if (start > key.offset) {
657 u64 new_num;
658 u64 old_num;
659 keep = 1;
Chris Mason5f39d392007-10-15 16:14:19 -0400660 WARN_ON(start & (root->sectorsize - 1));
Chris Mason39279cc2007-06-12 06:35:45 -0400661 if (found_extent) {
Chris Masondb945352007-10-15 16:15:53 -0400662 new_num = start - key.offset;
663 old_num = btrfs_file_extent_num_bytes(leaf,
664 extent);
665 *hint_byte =
666 btrfs_file_extent_disk_bytenr(leaf,
667 extent);
668 if (btrfs_file_extent_disk_bytenr(leaf,
669 extent)) {
Chris Mason90692182008-02-08 13:49:28 -0500670 dec_i_blocks(inode, old_num - new_num);
Chris Mason39279cc2007-06-12 06:35:45 -0400671 }
Chris Masondb945352007-10-15 16:15:53 -0400672 btrfs_set_file_extent_num_bytes(leaf, extent,
673 new_num);
Chris Mason5f39d392007-10-15 16:14:19 -0400674 btrfs_mark_buffer_dirty(leaf);
Chris Mason00f5c792007-11-30 10:09:33 -0500675 } else if (key.offset < inline_limit &&
676 (end > extent_end) &&
677 (inline_limit < extent_end)) {
Chris Mason3326d1b2007-10-15 16:18:25 -0400678 u32 new_size;
679 new_size = btrfs_file_extent_calc_inline_size(
Chris Mason00f5c792007-11-30 10:09:33 -0500680 inline_limit - key.offset);
Chris Mason90692182008-02-08 13:49:28 -0500681 dec_i_blocks(inode, (extent_end - key.offset) -
682 (inline_limit - key.offset));
Chris Mason3326d1b2007-10-15 16:18:25 -0400683 btrfs_truncate_item(trans, root, path,
Chris Mason179e29e2007-11-01 11:28:41 -0400684 new_size, 1);
Chris Mason39279cc2007-06-12 06:35:45 -0400685 }
686 }
687 /* delete the entire extent */
688 if (!keep) {
Chris Masondb945352007-10-15 16:15:53 -0400689 u64 disk_bytenr = 0;
690 u64 disk_num_bytes = 0;
691 u64 extent_num_bytes = 0;
Chris Mason7bb86312007-12-11 09:25:06 -0500692 u64 root_gen;
Chris Masond8d5f3e2007-12-11 12:42:00 -0500693 u64 root_owner;
Chris Mason7bb86312007-12-11 09:25:06 -0500694
Chris Masond8d5f3e2007-12-11 12:42:00 -0500695 root_gen = btrfs_header_generation(leaf);
696 root_owner = btrfs_header_owner(leaf);
Chris Mason39279cc2007-06-12 06:35:45 -0400697 if (found_extent) {
Chris Masondb945352007-10-15 16:15:53 -0400698 disk_bytenr =
699 btrfs_file_extent_disk_bytenr(leaf,
Chris Mason5f39d392007-10-15 16:14:19 -0400700 extent);
Chris Masondb945352007-10-15 16:15:53 -0400701 disk_num_bytes =
702 btrfs_file_extent_disk_num_bytes(leaf,
Chris Mason5f39d392007-10-15 16:14:19 -0400703 extent);
Chris Masondb945352007-10-15 16:15:53 -0400704 extent_num_bytes =
705 btrfs_file_extent_num_bytes(leaf, extent);
706 *hint_byte =
707 btrfs_file_extent_disk_bytenr(leaf,
708 extent);
Chris Mason39279cc2007-06-12 06:35:45 -0400709 }
710 ret = btrfs_del_item(trans, root, path);
Chris Mason54aa1f42007-06-22 14:16:25 -0400711 /* TODO update progress marker and return */
Chris Mason39279cc2007-06-12 06:35:45 -0400712 BUG_ON(ret);
713 btrfs_release_path(root, path);
714 extent = NULL;
Chris Masondb945352007-10-15 16:15:53 -0400715 if (found_extent && disk_bytenr != 0) {
Chris Mason90692182008-02-08 13:49:28 -0500716 dec_i_blocks(inode, extent_num_bytes);
Chris Mason39279cc2007-06-12 06:35:45 -0400717 ret = btrfs_free_extent(trans, root,
Chris Mason7bb86312007-12-11 09:25:06 -0500718 disk_bytenr,
719 disk_num_bytes,
Chris Masond8d5f3e2007-12-11 12:42:00 -0500720 root_owner,
Chris Mason7bb86312007-12-11 09:25:06 -0500721 root_gen, inode->i_ino,
722 key.offset, 0);
Chris Mason39279cc2007-06-12 06:35:45 -0400723 }
724
725 BUG_ON(ret);
726 if (!bookend && search_start >= end) {
727 ret = 0;
728 goto out;
729 }
730 if (!bookend)
731 continue;
732 }
Yan0181e582008-01-30 14:39:54 -0500733 if (bookend && found_inline && start <= key.offset) {
Chris Mason179e29e2007-11-01 11:28:41 -0400734 u32 new_size;
735 new_size = btrfs_file_extent_calc_inline_size(
Yan0181e582008-01-30 14:39:54 -0500736 extent_end - end);
Chris Mason90692182008-02-08 13:49:28 -0500737 dec_i_blocks(inode, (extent_end - key.offset) -
738 (extent_end - end));
Chris Mason179e29e2007-11-01 11:28:41 -0400739 btrfs_truncate_item(trans, root, path, new_size, 0);
740 }
Chris Mason39279cc2007-06-12 06:35:45 -0400741 /* create bookend, splitting the extent in two */
742 if (bookend && found_extent) {
743 struct btrfs_key ins;
744 ins.objectid = inode->i_ino;
745 ins.offset = end;
Chris Mason39279cc2007-06-12 06:35:45 -0400746 btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
Chris Mason39279cc2007-06-12 06:35:45 -0400747 btrfs_release_path(root, path);
748 ret = btrfs_insert_empty_item(trans, root, path, &ins,
749 sizeof(*extent));
Chris Mason8c2383c2007-06-18 09:57:58 -0400750
Chris Mason5f39d392007-10-15 16:14:19 -0400751 leaf = path->nodes[0];
Chris Mason8c2383c2007-06-18 09:57:58 -0400752 if (ret) {
Chris Mason5f39d392007-10-15 16:14:19 -0400753 btrfs_print_leaf(root, leaf);
754 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 -0400755 }
Chris Mason39279cc2007-06-12 06:35:45 -0400756 BUG_ON(ret);
Chris Mason5f39d392007-10-15 16:14:19 -0400757 extent = btrfs_item_ptr(leaf, path->slots[0],
758 struct btrfs_file_extent_item);
759 write_extent_buffer(leaf, &old,
760 (unsigned long)extent, sizeof(old));
Chris Mason39279cc2007-06-12 06:35:45 -0400761
Chris Mason5f39d392007-10-15 16:14:19 -0400762 btrfs_set_file_extent_offset(leaf, extent,
Chris Masondb945352007-10-15 16:15:53 -0400763 le64_to_cpu(old.offset) + end - key.offset);
764 WARN_ON(le64_to_cpu(old.num_bytes) <
765 (extent_end - end));
766 btrfs_set_file_extent_num_bytes(leaf, extent,
767 extent_end - end);
Chris Mason5f39d392007-10-15 16:14:19 -0400768 btrfs_set_file_extent_type(leaf, extent,
Chris Mason39279cc2007-06-12 06:35:45 -0400769 BTRFS_FILE_EXTENT_REG);
Chris Masondb945352007-10-15 16:15:53 -0400770
Chris Mason39279cc2007-06-12 06:35:45 -0400771 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masondb945352007-10-15 16:15:53 -0400772 if (le64_to_cpu(old.disk_bytenr) != 0) {
Chris Mason39279cc2007-06-12 06:35:45 -0400773 inode->i_blocks +=
Chris Masondb945352007-10-15 16:15:53 -0400774 btrfs_file_extent_num_bytes(leaf,
775 extent) >> 9;
Chris Mason39279cc2007-06-12 06:35:45 -0400776 }
777 ret = 0;
778 goto out;
779 }
780 }
781out:
782 btrfs_free_path(path);
Chris Mason90692182008-02-08 13:49:28 -0500783 btrfs_check_file(root, inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400784 return ret;
785}
786
787/*
788 * this gets pages into the page cache and locks them down
789 */
Chris Mason98ed5172008-01-03 10:01:48 -0500790static int prepare_pages(struct btrfs_root *root, struct file *file,
791 struct page **pages, size_t num_pages,
792 loff_t pos, unsigned long first_index,
793 unsigned long last_index, size_t write_bytes)
Chris Mason39279cc2007-06-12 06:35:45 -0400794{
795 int i;
796 unsigned long index = pos >> PAGE_CACHE_SHIFT;
Chris Mason6da6aba2007-12-18 16:15:09 -0500797 struct inode *inode = fdentry(file)->d_inode;
Chris Mason39279cc2007-06-12 06:35:45 -0400798 int err = 0;
Chris Mason8c2383c2007-06-18 09:57:58 -0400799 u64 start_pos;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400800 u64 last_pos;
Chris Mason8c2383c2007-06-18 09:57:58 -0400801
Chris Mason5f39d392007-10-15 16:14:19 -0400802 start_pos = pos & ~((u64)root->sectorsize - 1);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400803 last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;
Chris Mason39279cc2007-06-12 06:35:45 -0400804
805 memset(pages, 0, num_pages * sizeof(struct page *));
Chris Masone6dcd2d2008-07-17 12:53:50 -0400806again:
Chris Mason39279cc2007-06-12 06:35:45 -0400807 for (i = 0; i < num_pages; i++) {
808 pages[i] = grab_cache_page(inode->i_mapping, index + i);
809 if (!pages[i]) {
810 err = -ENOMEM;
Chris Masona52d9a82007-08-27 16:49:44 -0400811 BUG_ON(1);
Chris Mason39279cc2007-06-12 06:35:45 -0400812 }
Chris Masonccd467d2007-06-28 15:57:36 -0400813 wait_on_page_writeback(pages[i]);
Chris Mason39279cc2007-06-12 06:35:45 -0400814 }
Chris Mason07627042008-02-19 11:29:24 -0500815 if (start_pos < inode->i_size) {
Chris Masone6dcd2d2008-07-17 12:53:50 -0400816 struct btrfs_ordered_extent *ordered;
Chris Masond99cb302008-02-19 12:55:05 -0500817 lock_extent(&BTRFS_I(inode)->io_tree,
818 start_pos, last_pos - 1, GFP_NOFS);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400819 ordered = btrfs_lookup_first_ordered_extent(inode, last_pos -1);
820 if (ordered &&
821 ordered->file_offset + ordered->len > start_pos &&
822 ordered->file_offset < last_pos) {
823 btrfs_put_ordered_extent(ordered);
824 unlock_extent(&BTRFS_I(inode)->io_tree,
825 start_pos, last_pos - 1, GFP_NOFS);
826 for (i = 0; i < num_pages; i++) {
827 unlock_page(pages[i]);
828 page_cache_release(pages[i]);
829 }
830 btrfs_wait_ordered_range(inode, start_pos,
831 last_pos - start_pos);
832 goto again;
833 }
834 if (ordered)
835 btrfs_put_ordered_extent(ordered);
836
Chris Mason07627042008-02-19 11:29:24 -0500837 clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
838 last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC,
839 GFP_NOFS);
Chris Masond99cb302008-02-19 12:55:05 -0500840 unlock_extent(&BTRFS_I(inode)->io_tree,
841 start_pos, last_pos - 1, GFP_NOFS);
Chris Mason07627042008-02-19 11:29:24 -0500842 }
Chris Masone6dcd2d2008-07-17 12:53:50 -0400843 for (i = 0; i < num_pages; i++) {
844#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
845 ClearPageDirty(pages[i]);
846#else
847 cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
848#endif
849 set_page_extent_mapped(pages[i]);
850 WARN_ON(!PageLocked(pages[i]));
851 }
Chris Mason39279cc2007-06-12 06:35:45 -0400852 return 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400853}
854
855static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
856 size_t count, loff_t *ppos)
857{
858 loff_t pos;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400859 loff_t start_pos;
860 ssize_t num_written = 0;
861 ssize_t err = 0;
Chris Mason39279cc2007-06-12 06:35:45 -0400862 int ret = 0;
Chris Mason6da6aba2007-12-18 16:15:09 -0500863 struct inode *inode = fdentry(file)->d_inode;
Chris Mason39279cc2007-06-12 06:35:45 -0400864 struct btrfs_root *root = BTRFS_I(inode)->root;
Chris Mason8c2383c2007-06-18 09:57:58 -0400865 struct page **pages = NULL;
866 int nrptrs;
Chris Mason39279cc2007-06-12 06:35:45 -0400867 struct page *pinned[2];
868 unsigned long first_index;
869 unsigned long last_index;
Chris Mason8c2383c2007-06-18 09:57:58 -0400870
871 nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE,
872 PAGE_CACHE_SIZE / (sizeof(struct page *)));
Chris Mason39279cc2007-06-12 06:35:45 -0400873 pinned[0] = NULL;
874 pinned[1] = NULL;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400875
Chris Mason39279cc2007-06-12 06:35:45 -0400876 pos = *ppos;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400877 start_pos = pos;
878
Chris Mason39279cc2007-06-12 06:35:45 -0400879 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
880 current->backing_dev_info = inode->i_mapping->backing_dev_info;
881 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
882 if (err)
Chris Mason1832a6d2007-12-21 16:27:21 -0500883 goto out_nolock;
Chris Mason39279cc2007-06-12 06:35:45 -0400884 if (count == 0)
Chris Mason1832a6d2007-12-21 16:27:21 -0500885 goto out_nolock;
Jeff Mahoney12fa8ec2008-05-02 15:03:58 -0400886#ifdef REMOVE_SUID_PATH
887 err = remove_suid(&file->f_path);
888#else
Sven Wegener0ee0fda2008-07-30 16:54:26 -0400889# if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
890 err = file_remove_suid(file);
891# else
Chris Mason6da6aba2007-12-18 16:15:09 -0500892 err = remove_suid(fdentry(file));
Sven Wegener0ee0fda2008-07-30 16:54:26 -0400893# endif
Jeff Mahoney12fa8ec2008-05-02 15:03:58 -0400894#endif
Chris Mason39279cc2007-06-12 06:35:45 -0400895 if (err)
Chris Mason1832a6d2007-12-21 16:27:21 -0500896 goto out_nolock;
Chris Mason39279cc2007-06-12 06:35:45 -0400897 file_update_time(file);
898
Chris Mason8c2383c2007-06-18 09:57:58 -0400899 pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
Chris Mason39279cc2007-06-12 06:35:45 -0400900
901 mutex_lock(&inode->i_mutex);
902 first_index = pos >> PAGE_CACHE_SHIFT;
903 last_index = (pos + count) >> PAGE_CACHE_SHIFT;
904
905 /*
Chris Mason409c6112008-04-22 09:24:20 -0400906 * if this is a nodatasum mount, force summing off for the inode
907 * all the time. That way a later mount with summing on won't
908 * get confused
909 */
910 if (btrfs_test_opt(root, NODATASUM))
911 btrfs_set_flag(inode, NODATASUM);
912
913 /*
Chris Mason39279cc2007-06-12 06:35:45 -0400914 * there are lots of better ways to do this, but this code
915 * makes sure the first and last page in the file range are
916 * up to date and ready for cow
917 */
918 if ((pos & (PAGE_CACHE_SIZE - 1))) {
919 pinned[0] = grab_cache_page(inode->i_mapping, first_index);
920 if (!PageUptodate(pinned[0])) {
Chris Mason9ebefb182007-06-15 13:50:00 -0400921 ret = btrfs_readpage(NULL, pinned[0]);
Chris Mason39279cc2007-06-12 06:35:45 -0400922 BUG_ON(ret);
923 wait_on_page_locked(pinned[0]);
924 } else {
925 unlock_page(pinned[0]);
926 }
927 }
928 if ((pos + count) & (PAGE_CACHE_SIZE - 1)) {
929 pinned[1] = grab_cache_page(inode->i_mapping, last_index);
930 if (!PageUptodate(pinned[1])) {
Chris Mason9ebefb182007-06-15 13:50:00 -0400931 ret = btrfs_readpage(NULL, pinned[1]);
Chris Mason39279cc2007-06-12 06:35:45 -0400932 BUG_ON(ret);
933 wait_on_page_locked(pinned[1]);
934 } else {
935 unlock_page(pinned[1]);
936 }
937 }
938
Chris Mason39279cc2007-06-12 06:35:45 -0400939 while(count > 0) {
940 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
Chris Mason11bd1432007-06-22 14:16:24 -0400941 size_t write_bytes = min(count, nrptrs *
942 (size_t)PAGE_CACHE_SIZE -
Chris Mason8c2383c2007-06-18 09:57:58 -0400943 offset);
Chris Mason39279cc2007-06-12 06:35:45 -0400944 size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
945 PAGE_CACHE_SHIFT;
946
Chris Mason8c2383c2007-06-18 09:57:58 -0400947 WARN_ON(num_pages > nrptrs);
Chris Mason39279cc2007-06-12 06:35:45 -0400948 memset(pages, 0, sizeof(pages));
Chris Mason1832a6d2007-12-21 16:27:21 -0500949
Chris Mason1832a6d2007-12-21 16:27:21 -0500950 ret = btrfs_check_free_space(root, write_bytes, 0);
Chris Mason1832a6d2007-12-21 16:27:21 -0500951 if (ret)
952 goto out;
953
Chris Mason39279cc2007-06-12 06:35:45 -0400954 ret = prepare_pages(root, file, pages, num_pages,
955 pos, first_index, last_index,
Chris Mason8c2383c2007-06-18 09:57:58 -0400956 write_bytes);
Chris Mason54aa1f42007-06-22 14:16:25 -0400957 if (ret)
958 goto out;
Chris Mason39279cc2007-06-12 06:35:45 -0400959
Chris Mason39279cc2007-06-12 06:35:45 -0400960 ret = btrfs_copy_from_user(pos, num_pages,
961 write_bytes, pages, buf);
Chris Mason54aa1f42007-06-22 14:16:25 -0400962 if (ret) {
963 btrfs_drop_pages(pages, num_pages);
964 goto out;
965 }
Chris Mason39279cc2007-06-12 06:35:45 -0400966
967 ret = dirty_and_release_pages(NULL, root, file, pages,
968 num_pages, pos, write_bytes);
Chris Mason39279cc2007-06-12 06:35:45 -0400969 btrfs_drop_pages(pages, num_pages);
Chris Mason54aa1f42007-06-22 14:16:25 -0400970 if (ret)
971 goto out;
Chris Mason39279cc2007-06-12 06:35:45 -0400972
973 buf += write_bytes;
974 count -= write_bytes;
975 pos += write_bytes;
976 num_written += write_bytes;
977
Chris Mason8c2383c2007-06-18 09:57:58 -0400978 balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages);
Chris Mason448d6402007-11-27 07:52:01 -0800979 if (num_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
980 btrfs_btree_balance_dirty(root, 1);
Chris Masonab78c842008-07-29 16:15:18 -0400981 btrfs_throttle(root);
Chris Mason39279cc2007-06-12 06:35:45 -0400982 cond_resched();
983 }
Chris Mason39279cc2007-06-12 06:35:45 -0400984out:
Chris Mason1832a6d2007-12-21 16:27:21 -0500985 mutex_unlock(&inode->i_mutex);
Chris Mason5b92ee72008-01-03 13:46:11 -0500986
Chris Mason1832a6d2007-12-21 16:27:21 -0500987out_nolock:
Chris Mason8c2383c2007-06-18 09:57:58 -0400988 kfree(pages);
Chris Mason39279cc2007-06-12 06:35:45 -0400989 if (pinned[0])
990 page_cache_release(pinned[0]);
991 if (pinned[1])
992 page_cache_release(pinned[1]);
993 *ppos = pos;
Chris Mason2ff3e9b2007-10-29 14:36:41 -0400994
995 if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
996 err = sync_page_range(inode, inode->i_mapping,
997 start_pos, num_written);
998 if (err < 0)
999 num_written = err;
Chris Mason16432982008-04-10 10:23:21 -04001000 } else if (num_written > 0 && (file->f_flags & O_DIRECT)) {
Chris Masonbb8885c2008-05-02 14:49:33 -04001001#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
Chris Masonb248a412008-04-14 09:48:18 -04001002 do_sync_file_range(file, start_pos,
1003 start_pos + num_written - 1,
1004 SYNC_FILE_RANGE_WRITE |
1005 SYNC_FILE_RANGE_WAIT_AFTER);
1006#else
Chris Mason16432982008-04-10 10:23:21 -04001007 do_sync_mapping_range(inode->i_mapping, start_pos,
1008 start_pos + num_written - 1,
1009 SYNC_FILE_RANGE_WRITE |
1010 SYNC_FILE_RANGE_WAIT_AFTER);
Chris Masonb248a412008-04-14 09:48:18 -04001011#endif
Chris Mason16432982008-04-10 10:23:21 -04001012 invalidate_mapping_pages(inode->i_mapping,
1013 start_pos >> PAGE_CACHE_SHIFT,
1014 (start_pos + num_written - 1) >> PAGE_CACHE_SHIFT);
Chris Mason2ff3e9b2007-10-29 14:36:41 -04001015 }
Chris Mason39279cc2007-06-12 06:35:45 -04001016 current->backing_dev_info = NULL;
Chris Mason39279cc2007-06-12 06:35:45 -04001017 return num_written ? num_written : err;
1018}
1019
Sage Weil6bf13c02008-06-10 10:07:39 -04001020int btrfs_release_file(struct inode * inode, struct file * filp)
Mingminge1b81e62008-05-27 10:55:43 -04001021{
Sage Weil6bf13c02008-06-10 10:07:39 -04001022 if (filp->private_data)
1023 btrfs_ioctl_trans_end(filp);
Mingminge1b81e62008-05-27 10:55:43 -04001024 return 0;
1025}
1026
Chris Mason39279cc2007-06-12 06:35:45 -04001027static int btrfs_sync_file(struct file *file,
1028 struct dentry *dentry, int datasync)
1029{
1030 struct inode *inode = dentry->d_inode;
1031 struct btrfs_root *root = BTRFS_I(inode)->root;
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001032 int ret = 0;
Chris Mason39279cc2007-06-12 06:35:45 -04001033 struct btrfs_trans_handle *trans;
1034
1035 /*
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001036 * check the transaction that last modified this inode
1037 * and see if its already been committed
Chris Mason39279cc2007-06-12 06:35:45 -04001038 */
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001039 if (!BTRFS_I(inode)->last_trans)
1040 goto out;
Chris Masona2135012008-06-25 16:01:30 -04001041
Josef Bacik15ee9bc2007-08-10 16:22:09 -04001042 mutex_lock(&root->fs_info->trans_mutex);
1043 if (BTRFS_I(inode)->last_trans <=
1044 root->fs_info->last_trans_committed) {
1045 BTRFS_I(inode)->last_trans = 0;
1046 mutex_unlock(&root->fs_info->trans_mutex);
1047 goto out;
1048 }
1049 mutex_unlock(&root->fs_info->trans_mutex);
1050
1051 /*
Chris Masona52d9a82007-08-27 16:49:44 -04001052 * ok we haven't committed the transaction yet, lets do a commit
1053 */
Sage Weil6bf13c02008-06-10 10:07:39 -04001054 if (file->private_data)
1055 btrfs_ioctl_trans_end(file);
1056
Chris Mason39279cc2007-06-12 06:35:45 -04001057 trans = btrfs_start_transaction(root, 1);
1058 if (!trans) {
1059 ret = -ENOMEM;
1060 goto out;
1061 }
1062 ret = btrfs_commit_transaction(trans, root);
Chris Mason39279cc2007-06-12 06:35:45 -04001063out:
1064 return ret > 0 ? EIO : ret;
1065}
1066
Chris Mason9ebefb182007-06-15 13:50:00 -04001067static struct vm_operations_struct btrfs_file_vm_ops = {
Chris Mason92fee662007-07-25 12:31:35 -04001068#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
1069 .nopage = filemap_nopage,
1070 .populate = filemap_populate,
1071#else
1072 .fault = filemap_fault,
1073#endif
Chris Mason9ebefb182007-06-15 13:50:00 -04001074 .page_mkwrite = btrfs_page_mkwrite,
1075};
1076
1077static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
1078{
1079 vma->vm_ops = &btrfs_file_vm_ops;
1080 file_accessed(filp);
1081 return 0;
1082}
1083
Chris Mason39279cc2007-06-12 06:35:45 -04001084struct file_operations btrfs_file_operations = {
1085 .llseek = generic_file_llseek,
1086 .read = do_sync_read,
Chris Mason9ebefb182007-06-15 13:50:00 -04001087 .aio_read = generic_file_aio_read,
Chris Masone9906a92007-12-14 12:56:58 -05001088 .splice_read = generic_file_splice_read,
Chris Mason6da6aba2007-12-18 16:15:09 -05001089#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1090 .sendfile = generic_file_sendfile,
1091#endif
Chris Mason39279cc2007-06-12 06:35:45 -04001092 .write = btrfs_file_write,
Chris Mason9ebefb182007-06-15 13:50:00 -04001093 .mmap = btrfs_file_mmap,
Chris Mason39279cc2007-06-12 06:35:45 -04001094 .open = generic_file_open,
Mingminge1b81e62008-05-27 10:55:43 -04001095 .release = btrfs_release_file,
Chris Mason39279cc2007-06-12 06:35:45 -04001096 .fsync = btrfs_sync_file,
Christoph Hellwig34287aa2007-09-14 10:22:47 -04001097 .unlocked_ioctl = btrfs_ioctl,
Chris Mason39279cc2007-06-12 06:35:45 -04001098#ifdef CONFIG_COMPAT
Christoph Hellwig34287aa2007-09-14 10:22:47 -04001099 .compat_ioctl = btrfs_ioctl,
Chris Mason39279cc2007-06-12 06:35:45 -04001100#endif
1101};