Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 19 | #include <linux/fs.h> |
| 20 | #include <linux/pagemap.h> |
| 21 | #include <linux/highmem.h> |
| 22 | #include <linux/time.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/string.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 25 | #include <linux/backing-dev.h> |
| 26 | #include <linux/mpage.h> |
| 27 | #include <linux/swap.h> |
| 28 | #include <linux/writeback.h> |
| 29 | #include <linux/statfs.h> |
| 30 | #include <linux/compat.h> |
| 31 | #include "ctree.h" |
| 32 | #include "disk-io.h" |
| 33 | #include "transaction.h" |
| 34 | #include "btrfs_inode.h" |
| 35 | #include "ioctl.h" |
| 36 | #include "print-tree.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 37 | #include "tree-log.h" |
| 38 | #include "locking.h" |
Jeff Mahoney | 12fa8ec | 2008-05-02 15:03:58 -0400 | [diff] [blame] | 39 | #include "compat.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 40 | |
| 41 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 42 | /* simple helper to fault in pages and copy. This should go away |
| 43 | * and be replaced with calls into generic code. |
| 44 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 45 | static noinline int btrfs_copy_from_user(loff_t pos, int num_pages, |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 46 | int write_bytes, |
| 47 | struct page **prepared_pages, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 48 | const char __user *buf) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 49 | { |
| 50 | long page_fault = 0; |
| 51 | int i; |
| 52 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 53 | |
| 54 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { |
| 55 | size_t count = min_t(size_t, |
| 56 | PAGE_CACHE_SIZE - offset, write_bytes); |
| 57 | struct page *page = prepared_pages[i]; |
| 58 | fault_in_pages_readable(buf, count); |
| 59 | |
| 60 | /* Copy data from userspace to the current page */ |
| 61 | kmap(page); |
| 62 | page_fault = __copy_from_user(page_address(page) + offset, |
| 63 | buf, count); |
| 64 | /* Flush processor's dcache for this page */ |
| 65 | flush_dcache_page(page); |
| 66 | kunmap(page); |
| 67 | buf += count; |
| 68 | write_bytes -= count; |
| 69 | |
| 70 | if (page_fault) |
| 71 | break; |
| 72 | } |
| 73 | return page_fault ? -EFAULT : 0; |
| 74 | } |
| 75 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 76 | /* |
| 77 | * unlocks pages after btrfs_file_write is done with them |
| 78 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 79 | static noinline void btrfs_drop_pages(struct page **pages, size_t num_pages) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 80 | { |
| 81 | size_t i; |
| 82 | for (i = 0; i < num_pages; i++) { |
| 83 | if (!pages[i]) |
| 84 | break; |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 85 | /* page checked is some magic around finding pages that |
| 86 | * have been modified without going through btrfs_set_page_dirty |
| 87 | * clear it here |
| 88 | */ |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 89 | ClearPageChecked(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 90 | unlock_page(pages[i]); |
| 91 | mark_page_accessed(pages[i]); |
| 92 | page_cache_release(pages[i]); |
| 93 | } |
| 94 | } |
| 95 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 96 | /* |
| 97 | * after copy_from_user, pages need to be dirtied and we need to make |
| 98 | * sure holes are created between the current EOF and the start of |
| 99 | * any next extents (if required). |
| 100 | * |
| 101 | * this also makes the decision about creating an inline extent vs |
| 102 | * doing real data extents, marking pages dirty and delalloc as required. |
| 103 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 104 | static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 105 | struct btrfs_root *root, |
| 106 | struct file *file, |
| 107 | struct page **pages, |
| 108 | size_t num_pages, |
| 109 | loff_t pos, |
| 110 | size_t write_bytes) |
| 111 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 112 | int err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 113 | int i; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 114 | struct inode *inode = fdentry(file)->d_inode; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 115 | u64 num_bytes; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 116 | u64 start_pos; |
| 117 | u64 end_of_last_block; |
| 118 | u64 end_pos = pos + write_bytes; |
| 119 | loff_t isize = i_size_read(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 120 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 121 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 122 | num_bytes = (write_bytes + pos - start_pos + |
| 123 | root->sectorsize - 1) & ~((u64)root->sectorsize - 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 124 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 125 | end_of_last_block = start_pos + num_bytes - 1; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 126 | err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block); |
| 127 | if (err) |
| 128 | return err; |
| 129 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 130 | for (i = 0; i < num_pages; i++) { |
| 131 | struct page *p = pages[i]; |
| 132 | SetPageUptodate(p); |
| 133 | ClearPageChecked(p); |
| 134 | set_page_dirty(p); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 135 | } |
| 136 | if (end_pos > isize) { |
| 137 | i_size_write(inode, end_pos); |
Chris Mason | f597bb1 | 2009-06-27 21:06:22 -0400 | [diff] [blame] | 138 | /* we've only changed i_size in ram, and we haven't updated |
| 139 | * the disk i_size. There is no need to log the inode |
| 140 | * at this time. |
| 141 | */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 142 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 143 | return err; |
| 144 | } |
| 145 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 146 | /* |
| 147 | * this drops all the extents in the cache that intersect the range |
| 148 | * [start, end]. Existing extents are split as required. |
| 149 | */ |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 150 | int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, |
| 151 | int skip_pinned) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 152 | { |
| 153 | struct extent_map *em; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 154 | struct extent_map *split = NULL; |
| 155 | struct extent_map *split2 = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 156 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 157 | u64 len = end - start + 1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 158 | int ret; |
| 159 | int testend = 1; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 160 | unsigned long flags; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 161 | int compressed = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 162 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 163 | WARN_ON(end < start); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 164 | if (end == (u64)-1) { |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 165 | len = (u64)-1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 166 | testend = 0; |
| 167 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 168 | while (1) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 169 | if (!split) |
| 170 | split = alloc_extent_map(GFP_NOFS); |
| 171 | if (!split2) |
| 172 | split2 = alloc_extent_map(GFP_NOFS); |
| 173 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 174 | write_lock(&em_tree->lock); |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 175 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 176 | if (!em) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 177 | write_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 178 | break; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 179 | } |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 180 | flags = em->flags; |
| 181 | if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 182 | if (testend && em->start + em->len >= start + len) { |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 183 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 184 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 185 | break; |
| 186 | } |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 187 | start = em->start + em->len; |
| 188 | if (testend) |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 189 | len = start + len - (em->start + em->len); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 190 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 191 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 192 | continue; |
| 193 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 194 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Chris Mason | 3ce7e67 | 2008-07-31 15:42:54 -0400 | [diff] [blame] | 195 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 196 | remove_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 197 | |
| 198 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 199 | em->start < start) { |
| 200 | split->start = em->start; |
| 201 | split->len = start - em->start; |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 202 | split->orig_start = em->orig_start; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 203 | split->block_start = em->block_start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 204 | |
| 205 | if (compressed) |
| 206 | split->block_len = em->block_len; |
| 207 | else |
| 208 | split->block_len = split->len; |
| 209 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 210 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 211 | split->flags = flags; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 212 | ret = add_extent_mapping(em_tree, split); |
| 213 | BUG_ON(ret); |
| 214 | free_extent_map(split); |
| 215 | split = split2; |
| 216 | split2 = NULL; |
| 217 | } |
| 218 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 219 | testend && em->start + em->len > start + len) { |
| 220 | u64 diff = start + len - em->start; |
| 221 | |
| 222 | split->start = start + len; |
| 223 | split->len = em->start + em->len - (start + len); |
| 224 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 225 | split->flags = flags; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 226 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 227 | if (compressed) { |
| 228 | split->block_len = em->block_len; |
| 229 | split->block_start = em->block_start; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 230 | split->orig_start = em->orig_start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 231 | } else { |
| 232 | split->block_len = split->len; |
| 233 | split->block_start = em->block_start + diff; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 234 | split->orig_start = split->start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 235 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 236 | |
| 237 | ret = add_extent_mapping(em_tree, split); |
| 238 | BUG_ON(ret); |
| 239 | free_extent_map(split); |
| 240 | split = NULL; |
| 241 | } |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 242 | write_unlock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 243 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 244 | /* once for us */ |
| 245 | free_extent_map(em); |
| 246 | /* once for the tree*/ |
| 247 | free_extent_map(em); |
| 248 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 249 | if (split) |
| 250 | free_extent_map(split); |
| 251 | if (split2) |
| 252 | free_extent_map(split2); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 253 | return 0; |
| 254 | } |
| 255 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 256 | /* |
| 257 | * this is very complex, but the basic idea is to drop all extents |
| 258 | * in the range start - end. hint_block is filled in with a block number |
| 259 | * that would be a good hint to the block allocator for this file. |
| 260 | * |
| 261 | * If an extent intersects the range but is not entirely inside the range |
| 262 | * it is either truncated or split. Anything entirely inside the range |
| 263 | * is deleted from the tree. |
| 264 | */ |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 265 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode, |
| 266 | u64 start, u64 end, u64 *hint_byte, int drop_cache) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 267 | { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 268 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 269 | struct extent_buffer *leaf; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 270 | struct btrfs_file_extent_item *fi; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 271 | struct btrfs_path *path; |
| 272 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 273 | struct btrfs_key new_key; |
| 274 | u64 search_start = start; |
| 275 | u64 disk_bytenr = 0; |
| 276 | u64 num_bytes = 0; |
| 277 | u64 extent_offset = 0; |
| 278 | u64 extent_end = 0; |
| 279 | int del_nr = 0; |
| 280 | int del_slot = 0; |
| 281 | int extent_type; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 282 | int recow; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 283 | int ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 284 | |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 285 | if (drop_cache) |
| 286 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 287 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 288 | path = btrfs_alloc_path(); |
| 289 | if (!path) |
| 290 | return -ENOMEM; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 291 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 292 | while (1) { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 293 | recow = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 294 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, |
| 295 | search_start, -1); |
| 296 | if (ret < 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 297 | break; |
| 298 | if (ret > 0 && path->slots[0] > 0 && search_start == start) { |
| 299 | leaf = path->nodes[0]; |
| 300 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); |
| 301 | if (key.objectid == inode->i_ino && |
| 302 | key.type == BTRFS_EXTENT_DATA_KEY) |
| 303 | path->slots[0]--; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 304 | } |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 305 | ret = 0; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 306 | next_slot: |
| 307 | leaf = path->nodes[0]; |
| 308 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 309 | BUG_ON(del_nr > 0); |
| 310 | ret = btrfs_next_leaf(root, path); |
| 311 | if (ret < 0) |
| 312 | break; |
| 313 | if (ret > 0) { |
| 314 | ret = 0; |
| 315 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 316 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 317 | leaf = path->nodes[0]; |
| 318 | recow = 1; |
| 319 | } |
| 320 | |
| 321 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 322 | if (key.objectid > inode->i_ino || |
| 323 | key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end) |
| 324 | break; |
| 325 | |
| 326 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 327 | struct btrfs_file_extent_item); |
| 328 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 329 | |
| 330 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
| 331 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 332 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 333 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 334 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
| 335 | extent_end = key.offset + |
| 336 | btrfs_file_extent_num_bytes(leaf, fi); |
| 337 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 338 | extent_end = key.offset + |
| 339 | btrfs_file_extent_inline_len(leaf, fi); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 340 | } else { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 341 | WARN_ON(1); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 342 | extent_end = search_start; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 343 | } |
| 344 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 345 | if (extent_end <= search_start) { |
| 346 | path->slots[0]++; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 347 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 348 | } |
| 349 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 350 | search_start = max(key.offset, start); |
| 351 | if (recow) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 352 | btrfs_release_path(root, path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 353 | continue; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 354 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 355 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 356 | /* |
| 357 | * | - range to drop - | |
| 358 | * | -------- extent -------- | |
| 359 | */ |
| 360 | if (start > key.offset && end < extent_end) { |
| 361 | BUG_ON(del_nr > 0); |
| 362 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 363 | |
| 364 | memcpy(&new_key, &key, sizeof(new_key)); |
| 365 | new_key.offset = start; |
| 366 | ret = btrfs_duplicate_item(trans, root, path, |
| 367 | &new_key); |
| 368 | if (ret == -EAGAIN) { |
| 369 | btrfs_release_path(root, path); |
| 370 | continue; |
| 371 | } |
| 372 | if (ret < 0) |
| 373 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 374 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 375 | leaf = path->nodes[0]; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 376 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
| 377 | struct btrfs_file_extent_item); |
| 378 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 379 | start - key.offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 380 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 381 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 382 | struct btrfs_file_extent_item); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 383 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 384 | extent_offset += start - key.offset; |
| 385 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 386 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 387 | extent_end - start); |
| 388 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 389 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 390 | if (disk_bytenr > 0) { |
| 391 | ret = btrfs_inc_extent_ref(trans, root, |
| 392 | disk_bytenr, num_bytes, 0, |
| 393 | root->root_key.objectid, |
| 394 | new_key.objectid, |
| 395 | start - extent_offset); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 396 | BUG_ON(ret); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 397 | *hint_byte = disk_bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 398 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 399 | key.offset = start; |
| 400 | } |
| 401 | /* |
| 402 | * | ---- range to drop ----- | |
| 403 | * | -------- extent -------- | |
| 404 | */ |
| 405 | if (start <= key.offset && end < extent_end) { |
| 406 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 407 | |
| 408 | memcpy(&new_key, &key, sizeof(new_key)); |
| 409 | new_key.offset = end; |
| 410 | btrfs_set_item_key_safe(trans, root, path, &new_key); |
| 411 | |
| 412 | extent_offset += end - key.offset; |
| 413 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 414 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 415 | extent_end - end); |
| 416 | btrfs_mark_buffer_dirty(leaf); |
| 417 | if (disk_bytenr > 0) { |
| 418 | inode_sub_bytes(inode, end - key.offset); |
| 419 | *hint_byte = disk_bytenr; |
| 420 | } |
| 421 | break; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 422 | } |
| 423 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 424 | search_start = extent_end; |
| 425 | /* |
| 426 | * | ---- range to drop ----- | |
| 427 | * | -------- extent -------- | |
| 428 | */ |
| 429 | if (start > key.offset && end >= extent_end) { |
| 430 | BUG_ON(del_nr > 0); |
| 431 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 432 | |
| 433 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 434 | start - key.offset); |
| 435 | btrfs_mark_buffer_dirty(leaf); |
| 436 | if (disk_bytenr > 0) { |
| 437 | inode_sub_bytes(inode, extent_end - start); |
| 438 | *hint_byte = disk_bytenr; |
| 439 | } |
| 440 | if (end == extent_end) |
| 441 | break; |
| 442 | |
| 443 | path->slots[0]++; |
| 444 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 445 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 446 | |
| 447 | /* |
| 448 | * | ---- range to drop ----- | |
| 449 | * | ------ extent ------ | |
| 450 | */ |
| 451 | if (start <= key.offset && end >= extent_end) { |
| 452 | if (del_nr == 0) { |
| 453 | del_slot = path->slots[0]; |
| 454 | del_nr = 1; |
| 455 | } else { |
| 456 | BUG_ON(del_slot + del_nr != path->slots[0]); |
| 457 | del_nr++; |
| 458 | } |
| 459 | |
| 460 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 461 | inode_sub_bytes(inode, |
| 462 | extent_end - key.offset); |
| 463 | extent_end = ALIGN(extent_end, |
| 464 | root->sectorsize); |
| 465 | } else if (disk_bytenr > 0) { |
| 466 | ret = btrfs_free_extent(trans, root, |
| 467 | disk_bytenr, num_bytes, 0, |
| 468 | root->root_key.objectid, |
| 469 | key.objectid, key.offset - |
| 470 | extent_offset); |
| 471 | BUG_ON(ret); |
| 472 | inode_sub_bytes(inode, |
| 473 | extent_end - key.offset); |
| 474 | *hint_byte = disk_bytenr; |
| 475 | } |
| 476 | |
| 477 | if (end == extent_end) |
| 478 | break; |
| 479 | |
| 480 | if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) { |
| 481 | path->slots[0]++; |
| 482 | goto next_slot; |
| 483 | } |
| 484 | |
| 485 | ret = btrfs_del_items(trans, root, path, del_slot, |
| 486 | del_nr); |
| 487 | BUG_ON(ret); |
| 488 | |
| 489 | del_nr = 0; |
| 490 | del_slot = 0; |
| 491 | |
| 492 | btrfs_release_path(root, path); |
| 493 | continue; |
| 494 | } |
| 495 | |
| 496 | BUG_ON(1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 497 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 498 | |
| 499 | if (del_nr > 0) { |
| 500 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
| 501 | BUG_ON(ret); |
| 502 | } |
| 503 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 504 | btrfs_free_path(path); |
| 505 | return ret; |
| 506 | } |
| 507 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 508 | static int extent_mergeable(struct extent_buffer *leaf, int slot, |
| 509 | u64 objectid, u64 bytenr, u64 *start, u64 *end) |
| 510 | { |
| 511 | struct btrfs_file_extent_item *fi; |
| 512 | struct btrfs_key key; |
| 513 | u64 extent_end; |
| 514 | |
| 515 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) |
| 516 | return 0; |
| 517 | |
| 518 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 519 | if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) |
| 520 | return 0; |
| 521 | |
| 522 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 523 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG || |
| 524 | btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr || |
| 525 | btrfs_file_extent_compression(leaf, fi) || |
| 526 | btrfs_file_extent_encryption(leaf, fi) || |
| 527 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 528 | return 0; |
| 529 | |
| 530 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 531 | if ((*start && *start != key.offset) || (*end && *end != extent_end)) |
| 532 | return 0; |
| 533 | |
| 534 | *start = key.offset; |
| 535 | *end = extent_end; |
| 536 | return 1; |
| 537 | } |
| 538 | |
| 539 | /* |
| 540 | * Mark extent in the range start - end as written. |
| 541 | * |
| 542 | * This changes extent type from 'pre-allocated' to 'regular'. If only |
| 543 | * part of extent is marked as written, the extent will be split into |
| 544 | * two or three. |
| 545 | */ |
| 546 | int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 547 | struct inode *inode, u64 start, u64 end) |
| 548 | { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 549 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 550 | struct extent_buffer *leaf; |
| 551 | struct btrfs_path *path; |
| 552 | struct btrfs_file_extent_item *fi; |
| 553 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 554 | struct btrfs_key new_key; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 555 | u64 bytenr; |
| 556 | u64 num_bytes; |
| 557 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 558 | u64 orig_offset; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 559 | u64 other_start; |
| 560 | u64 other_end; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 561 | u64 split; |
| 562 | int del_nr = 0; |
| 563 | int del_slot = 0; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 564 | int ret; |
| 565 | |
| 566 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
| 567 | |
| 568 | path = btrfs_alloc_path(); |
| 569 | BUG_ON(!path); |
| 570 | again: |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 571 | split = start; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 572 | key.objectid = inode->i_ino; |
| 573 | key.type = BTRFS_EXTENT_DATA_KEY; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 574 | key.offset = split; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 575 | |
| 576 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 577 | if (ret > 0 && path->slots[0] > 0) |
| 578 | path->slots[0]--; |
| 579 | |
| 580 | leaf = path->nodes[0]; |
| 581 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 582 | BUG_ON(key.objectid != inode->i_ino || |
| 583 | key.type != BTRFS_EXTENT_DATA_KEY); |
| 584 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 585 | struct btrfs_file_extent_item); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 586 | BUG_ON(btrfs_file_extent_type(leaf, fi) != |
| 587 | BTRFS_FILE_EXTENT_PREALLOC); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 588 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 589 | BUG_ON(key.offset > start || extent_end < end); |
| 590 | |
| 591 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 592 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 593 | orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 594 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 595 | while (start > key.offset || end < extent_end) { |
| 596 | if (key.offset == start) |
| 597 | split = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 598 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 599 | memcpy(&new_key, &key, sizeof(new_key)); |
| 600 | new_key.offset = split; |
| 601 | ret = btrfs_duplicate_item(trans, root, path, &new_key); |
| 602 | if (ret == -EAGAIN) { |
| 603 | btrfs_release_path(root, path); |
| 604 | goto again; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 605 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 606 | BUG_ON(ret < 0); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 607 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 608 | leaf = path->nodes[0]; |
| 609 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 610 | struct btrfs_file_extent_item); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 611 | btrfs_set_file_extent_num_bytes(leaf, fi, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 612 | split - key.offset); |
| 613 | |
| 614 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 615 | struct btrfs_file_extent_item); |
| 616 | |
| 617 | btrfs_set_file_extent_offset(leaf, fi, split - orig_offset); |
| 618 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 619 | extent_end - split); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 620 | btrfs_mark_buffer_dirty(leaf); |
| 621 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 622 | ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, |
| 623 | root->root_key.objectid, |
| 624 | inode->i_ino, orig_offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 625 | BUG_ON(ret); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 626 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 627 | if (split == start) { |
| 628 | key.offset = start; |
| 629 | } else { |
| 630 | BUG_ON(start != key.offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 631 | path->slots[0]--; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 632 | extent_end = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 633 | } |
| 634 | } |
| 635 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 636 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 637 | struct btrfs_file_extent_item); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 638 | |
| 639 | other_start = end; |
| 640 | other_end = 0; |
| 641 | if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino, |
| 642 | bytenr, &other_start, &other_end)) { |
| 643 | extent_end = other_end; |
| 644 | del_slot = path->slots[0] + 1; |
| 645 | del_nr++; |
| 646 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 647 | 0, root->root_key.objectid, |
| 648 | inode->i_ino, orig_offset); |
| 649 | BUG_ON(ret); |
| 650 | } |
| 651 | other_start = 0; |
| 652 | other_end = start; |
| 653 | if (extent_mergeable(leaf, path->slots[0] - 1, inode->i_ino, |
| 654 | bytenr, &other_start, &other_end)) { |
| 655 | key.offset = other_start; |
| 656 | del_slot = path->slots[0]; |
| 657 | del_nr++; |
| 658 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 659 | 0, root->root_key.objectid, |
| 660 | inode->i_ino, orig_offset); |
| 661 | BUG_ON(ret); |
| 662 | } |
| 663 | if (del_nr == 0) { |
| 664 | btrfs_set_file_extent_type(leaf, fi, |
| 665 | BTRFS_FILE_EXTENT_REG); |
| 666 | btrfs_mark_buffer_dirty(leaf); |
| 667 | goto out; |
| 668 | } |
| 669 | |
| 670 | fi = btrfs_item_ptr(leaf, del_slot - 1, |
| 671 | struct btrfs_file_extent_item); |
| 672 | btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG); |
| 673 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 674 | extent_end - key.offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 675 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 676 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 677 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
| 678 | BUG_ON(ret); |
| 679 | out: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 680 | btrfs_free_path(path); |
| 681 | return 0; |
| 682 | } |
| 683 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 684 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 685 | * this gets pages into the page cache and locks them down, it also properly |
| 686 | * waits for data=ordered extents to finish before allowing the pages to be |
| 687 | * modified. |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 688 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 689 | static noinline int prepare_pages(struct btrfs_root *root, struct file *file, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 690 | struct page **pages, size_t num_pages, |
| 691 | loff_t pos, unsigned long first_index, |
| 692 | unsigned long last_index, size_t write_bytes) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 693 | { |
| 694 | int i; |
| 695 | unsigned long index = pos >> PAGE_CACHE_SHIFT; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 696 | struct inode *inode = fdentry(file)->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 697 | int err = 0; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 698 | u64 start_pos; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 699 | u64 last_pos; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 700 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 701 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 702 | last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 703 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 704 | if (start_pos > inode->i_size) { |
| 705 | err = btrfs_cont_expand(inode, start_pos); |
| 706 | if (err) |
| 707 | return err; |
| 708 | } |
| 709 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 710 | memset(pages, 0, num_pages * sizeof(struct page *)); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 711 | again: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 712 | for (i = 0; i < num_pages; i++) { |
| 713 | pages[i] = grab_cache_page(inode->i_mapping, index + i); |
| 714 | if (!pages[i]) { |
| 715 | err = -ENOMEM; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 716 | BUG_ON(1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 717 | } |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 718 | wait_on_page_writeback(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 719 | } |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 720 | if (start_pos < inode->i_size) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 721 | struct btrfs_ordered_extent *ordered; |
Chris Mason | d99cb30 | 2008-02-19 12:55:05 -0500 | [diff] [blame] | 722 | lock_extent(&BTRFS_I(inode)->io_tree, |
| 723 | start_pos, last_pos - 1, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 724 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 725 | last_pos - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 726 | if (ordered && |
| 727 | ordered->file_offset + ordered->len > start_pos && |
| 728 | ordered->file_offset < last_pos) { |
| 729 | btrfs_put_ordered_extent(ordered); |
| 730 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 731 | start_pos, last_pos - 1, GFP_NOFS); |
| 732 | for (i = 0; i < num_pages; i++) { |
| 733 | unlock_page(pages[i]); |
| 734 | page_cache_release(pages[i]); |
| 735 | } |
| 736 | btrfs_wait_ordered_range(inode, start_pos, |
| 737 | last_pos - start_pos); |
| 738 | goto again; |
| 739 | } |
| 740 | if (ordered) |
| 741 | btrfs_put_ordered_extent(ordered); |
| 742 | |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 743 | clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos, |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 744 | last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC | |
| 745 | EXTENT_DO_ACCOUNTING, |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 746 | GFP_NOFS); |
Chris Mason | d99cb30 | 2008-02-19 12:55:05 -0500 | [diff] [blame] | 747 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 748 | start_pos, last_pos - 1, GFP_NOFS); |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 749 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 750 | for (i = 0; i < num_pages; i++) { |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 751 | clear_page_dirty_for_io(pages[i]); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 752 | set_page_extent_mapped(pages[i]); |
| 753 | WARN_ON(!PageLocked(pages[i])); |
| 754 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 755 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, |
| 759 | size_t count, loff_t *ppos) |
| 760 | { |
| 761 | loff_t pos; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 762 | loff_t start_pos; |
| 763 | ssize_t num_written = 0; |
| 764 | ssize_t err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 765 | int ret = 0; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 766 | struct inode *inode = fdentry(file)->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 767 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 768 | struct page **pages = NULL; |
| 769 | int nrptrs; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 770 | struct page *pinned[2]; |
| 771 | unsigned long first_index; |
| 772 | unsigned long last_index; |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 773 | int will_write; |
| 774 | |
| 775 | will_write = ((file->f_flags & O_SYNC) || IS_SYNC(inode) || |
| 776 | (file->f_flags & O_DIRECT)); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 777 | |
| 778 | nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE, |
| 779 | PAGE_CACHE_SIZE / (sizeof(struct page *))); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 780 | pinned[0] = NULL; |
| 781 | pinned[1] = NULL; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 782 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 783 | pos = *ppos; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 784 | start_pos = pos; |
| 785 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 786 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
Chris Mason | 2b1f55b | 2008-09-24 11:48:04 -0400 | [diff] [blame] | 787 | |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 788 | /* do the reserve before the mutex lock in case we have to do some |
| 789 | * flushing. We wouldn't deadlock, but this is more polite. |
| 790 | */ |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 791 | err = btrfs_reserve_metadata_for_delalloc(root, inode, 1); |
| 792 | if (err) |
| 793 | goto out_nolock; |
| 794 | |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 795 | mutex_lock(&inode->i_mutex); |
| 796 | |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 797 | current->backing_dev_info = inode->i_mapping->backing_dev_info; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 798 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 799 | if (err) |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 800 | goto out; |
| 801 | |
Jeff Mahoney | 12fa8ec | 2008-05-02 15:03:58 -0400 | [diff] [blame] | 802 | if (count == 0) |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 803 | goto out; |
Sven Wegener | 0ee0fda | 2008-07-30 16:54:26 -0400 | [diff] [blame] | 804 | |
| 805 | err = file_remove_suid(file); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 806 | if (err) |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 807 | goto out; |
| 808 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 809 | file_update_time(file); |
| 810 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 811 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 812 | |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 813 | /* generic_write_checks can change our pos */ |
| 814 | start_pos = pos; |
| 815 | |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 816 | BTRFS_I(inode)->sequence++; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 817 | first_index = pos >> PAGE_CACHE_SHIFT; |
| 818 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; |
| 819 | |
| 820 | /* |
| 821 | * there are lots of better ways to do this, but this code |
| 822 | * makes sure the first and last page in the file range are |
| 823 | * up to date and ready for cow |
| 824 | */ |
| 825 | if ((pos & (PAGE_CACHE_SIZE - 1))) { |
| 826 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); |
| 827 | if (!PageUptodate(pinned[0])) { |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 828 | ret = btrfs_readpage(NULL, pinned[0]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 829 | BUG_ON(ret); |
| 830 | wait_on_page_locked(pinned[0]); |
| 831 | } else { |
| 832 | unlock_page(pinned[0]); |
| 833 | } |
| 834 | } |
| 835 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { |
| 836 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); |
| 837 | if (!PageUptodate(pinned[1])) { |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 838 | ret = btrfs_readpage(NULL, pinned[1]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 839 | BUG_ON(ret); |
| 840 | wait_on_page_locked(pinned[1]); |
| 841 | } else { |
| 842 | unlock_page(pinned[1]); |
| 843 | } |
| 844 | } |
| 845 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 846 | while (count > 0) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 847 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
Chris Mason | 11bd143 | 2007-06-22 14:16:24 -0400 | [diff] [blame] | 848 | size_t write_bytes = min(count, nrptrs * |
| 849 | (size_t)PAGE_CACHE_SIZE - |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 850 | offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 851 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> |
| 852 | PAGE_CACHE_SHIFT; |
| 853 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 854 | WARN_ON(num_pages > nrptrs); |
yanhai zhu | 9aead43 | 2009-01-05 15:49:11 -0500 | [diff] [blame] | 855 | memset(pages, 0, sizeof(struct page *) * nrptrs); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 856 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 857 | ret = btrfs_check_data_free_space(root, inode, write_bytes); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 858 | if (ret) |
| 859 | goto out; |
| 860 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 861 | ret = prepare_pages(root, file, pages, num_pages, |
| 862 | pos, first_index, last_index, |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 863 | write_bytes); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 864 | if (ret) { |
| 865 | btrfs_free_reserved_data_space(root, inode, |
| 866 | write_bytes); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 867 | goto out; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 868 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 869 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 870 | ret = btrfs_copy_from_user(pos, num_pages, |
| 871 | write_bytes, pages, buf); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 872 | if (ret) { |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 873 | btrfs_free_reserved_data_space(root, inode, |
| 874 | write_bytes); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 875 | btrfs_drop_pages(pages, num_pages); |
| 876 | goto out; |
| 877 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 878 | |
| 879 | ret = dirty_and_release_pages(NULL, root, file, pages, |
| 880 | num_pages, pos, write_bytes); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 881 | btrfs_drop_pages(pages, num_pages); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 882 | if (ret) { |
| 883 | btrfs_free_reserved_data_space(root, inode, |
| 884 | write_bytes); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 885 | goto out; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 886 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 887 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 888 | if (will_write) { |
Christoph Hellwig | 8aa38c3 | 2009-10-01 12:58:30 -0400 | [diff] [blame] | 889 | filemap_fdatawrite_range(inode->i_mapping, pos, |
| 890 | pos + write_bytes - 1); |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 891 | } else { |
| 892 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, |
| 893 | num_pages); |
| 894 | if (num_pages < |
| 895 | (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
| 896 | btrfs_btree_balance_dirty(root, 1); |
| 897 | btrfs_throttle(root); |
| 898 | } |
| 899 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 900 | buf += write_bytes; |
| 901 | count -= write_bytes; |
| 902 | pos += write_bytes; |
| 903 | num_written += write_bytes; |
| 904 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 905 | cond_resched(); |
| 906 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 907 | out: |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 908 | mutex_unlock(&inode->i_mutex); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 909 | if (ret) |
| 910 | err = ret; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 911 | btrfs_unreserve_metadata_for_delalloc(root, inode, 1); |
Chris Mason | 5b92ee7 | 2008-01-03 13:46:11 -0500 | [diff] [blame] | 912 | |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 913 | out_nolock: |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 914 | kfree(pages); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 915 | if (pinned[0]) |
| 916 | page_cache_release(pinned[0]); |
| 917 | if (pinned[1]) |
| 918 | page_cache_release(pinned[1]); |
| 919 | *ppos = pos; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 920 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 921 | /* |
| 922 | * we want to make sure fsync finds this change |
| 923 | * but we haven't joined a transaction running right now. |
| 924 | * |
| 925 | * Later on, someone is sure to update the inode and get the |
| 926 | * real transid recorded. |
| 927 | * |
| 928 | * We set last_trans now to the fs_info generation + 1, |
| 929 | * this will either be one more than the running transaction |
| 930 | * or the generation used for the next transaction if there isn't |
| 931 | * one running right now. |
| 932 | */ |
| 933 | BTRFS_I(inode)->last_trans = root->fs_info->generation + 1; |
| 934 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 935 | if (num_written > 0 && will_write) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 936 | struct btrfs_trans_handle *trans; |
| 937 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 938 | err = btrfs_wait_ordered_range(inode, start_pos, num_written); |
| 939 | if (err) |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 940 | num_written = err; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 941 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 942 | if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) { |
| 943 | trans = btrfs_start_transaction(root, 1); |
| 944 | ret = btrfs_log_dentry_safe(trans, root, |
| 945 | file->f_dentry); |
| 946 | if (ret == 0) { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 947 | ret = btrfs_sync_log(trans, root); |
| 948 | if (ret == 0) |
| 949 | btrfs_end_transaction(trans, root); |
| 950 | else |
| 951 | btrfs_commit_transaction(trans, root); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 952 | } else if (ret != BTRFS_NO_LOG_SYNC) { |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 953 | btrfs_commit_transaction(trans, root); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 954 | } else { |
| 955 | btrfs_end_transaction(trans, root); |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 956 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 957 | } |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 958 | if (file->f_flags & O_DIRECT) { |
| 959 | invalidate_mapping_pages(inode->i_mapping, |
| 960 | start_pos >> PAGE_CACHE_SHIFT, |
| 961 | (start_pos + num_written - 1) >> PAGE_CACHE_SHIFT); |
| 962 | } |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 963 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 964 | current->backing_dev_info = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 965 | return num_written ? num_written : err; |
| 966 | } |
| 967 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 968 | int btrfs_release_file(struct inode *inode, struct file *filp) |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 969 | { |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 970 | /* |
| 971 | * ordered_data_close is set by settattr when we are about to truncate |
| 972 | * a file from a non-zero size to a zero size. This tries to |
| 973 | * flush down new bytes that may have been written if the |
| 974 | * application were using truncate to replace a file in place. |
| 975 | */ |
| 976 | if (BTRFS_I(inode)->ordered_data_close) { |
| 977 | BTRFS_I(inode)->ordered_data_close = 0; |
| 978 | btrfs_add_ordered_operation(NULL, BTRFS_I(inode)->root, inode); |
| 979 | if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
| 980 | filemap_flush(inode->i_mapping); |
| 981 | } |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 982 | if (filp->private_data) |
| 983 | btrfs_ioctl_trans_end(filp); |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 984 | return 0; |
| 985 | } |
| 986 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 987 | /* |
| 988 | * fsync call for both files and directories. This logs the inode into |
| 989 | * the tree log instead of forcing full commits whenever possible. |
| 990 | * |
| 991 | * It needs to call filemap_fdatawait so that all ordered extent updates are |
| 992 | * in the metadata btree are up to date for copying to the log. |
| 993 | * |
| 994 | * It drops the inode mutex before doing the tree log commit. This is an |
| 995 | * important optimization for directories because holding the mutex prevents |
| 996 | * new operations on the dir while we write to disk. |
| 997 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 998 | int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 999 | { |
| 1000 | struct inode *inode = dentry->d_inode; |
| 1001 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1002 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1003 | struct btrfs_trans_handle *trans; |
| 1004 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1005 | |
| 1006 | /* we wait first, since the writeback may change the inode */ |
| 1007 | root->log_batch++; |
| 1008 | /* the VFS called filemap_fdatawrite for us */ |
| 1009 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
| 1010 | root->log_batch++; |
| 1011 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1012 | /* |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1013 | * check the transaction that last modified this inode |
| 1014 | * and see if its already been committed |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1015 | */ |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1016 | if (!BTRFS_I(inode)->last_trans) |
| 1017 | goto out; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1018 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1019 | /* |
| 1020 | * if the last transaction that changed this file was before |
| 1021 | * the current transaction, we can bail out now without any |
| 1022 | * syncing |
| 1023 | */ |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1024 | mutex_lock(&root->fs_info->trans_mutex); |
| 1025 | if (BTRFS_I(inode)->last_trans <= |
| 1026 | root->fs_info->last_trans_committed) { |
| 1027 | BTRFS_I(inode)->last_trans = 0; |
| 1028 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1029 | goto out; |
| 1030 | } |
| 1031 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1032 | |
| 1033 | /* |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1034 | * ok we haven't committed the transaction yet, lets do a commit |
| 1035 | */ |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1036 | if (file && file->private_data) |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1037 | btrfs_ioctl_trans_end(file); |
| 1038 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1039 | trans = btrfs_start_transaction(root, 1); |
| 1040 | if (!trans) { |
| 1041 | ret = -ENOMEM; |
| 1042 | goto out; |
| 1043 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1044 | |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1045 | ret = btrfs_log_dentry_safe(trans, root, dentry); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1046 | if (ret < 0) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1047 | goto out; |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1048 | |
| 1049 | /* we've logged all the items and now have a consistent |
| 1050 | * version of the file in the log. It is possible that |
| 1051 | * someone will come in and modify the file, but that's |
| 1052 | * fine because the log is consistent on disk, and we |
| 1053 | * have references to all of the file's extents |
| 1054 | * |
| 1055 | * It is possible that someone will come in and log the |
| 1056 | * file again, but that will end up using the synchronization |
| 1057 | * inside btrfs_sync_log to keep things safe. |
| 1058 | */ |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1059 | mutex_unlock(&dentry->d_inode->i_mutex); |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1060 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1061 | if (ret != BTRFS_NO_LOG_SYNC) { |
| 1062 | if (ret > 0) { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1063 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1064 | } else { |
| 1065 | ret = btrfs_sync_log(trans, root); |
| 1066 | if (ret == 0) |
| 1067 | ret = btrfs_end_transaction(trans, root); |
| 1068 | else |
| 1069 | ret = btrfs_commit_transaction(trans, root); |
| 1070 | } |
| 1071 | } else { |
| 1072 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1073 | } |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1074 | mutex_lock(&dentry->d_inode->i_mutex); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1075 | out: |
| 1076 | return ret > 0 ? EIO : ret; |
| 1077 | } |
| 1078 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1079 | static const struct vm_operations_struct btrfs_file_vm_ops = { |
Chris Mason | 92fee66 | 2007-07-25 12:31:35 -0400 | [diff] [blame] | 1080 | .fault = filemap_fault, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1081 | .page_mkwrite = btrfs_page_mkwrite, |
| 1082 | }; |
| 1083 | |
| 1084 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
| 1085 | { |
| 1086 | vma->vm_ops = &btrfs_file_vm_ops; |
| 1087 | file_accessed(filp); |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 1091 | const struct file_operations btrfs_file_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1092 | .llseek = generic_file_llseek, |
| 1093 | .read = do_sync_read, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1094 | .aio_read = generic_file_aio_read, |
Chris Mason | e9906a9 | 2007-12-14 12:56:58 -0500 | [diff] [blame] | 1095 | .splice_read = generic_file_splice_read, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1096 | .write = btrfs_file_write, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1097 | .mmap = btrfs_file_mmap, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1098 | .open = generic_file_open, |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1099 | .release = btrfs_release_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1100 | .fsync = btrfs_sync_file, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 1101 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1102 | #ifdef CONFIG_COMPAT |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 1103 | .compat_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1104 | #endif |
| 1105 | }; |