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> |
| 25 | #include <linux/smp_lock.h> |
| 26 | #include <linux/backing-dev.h> |
| 27 | #include <linux/mpage.h> |
| 28 | #include <linux/swap.h> |
| 29 | #include <linux/writeback.h> |
| 30 | #include <linux/statfs.h> |
| 31 | #include <linux/compat.h> |
| 32 | #include "ctree.h" |
| 33 | #include "disk-io.h" |
| 34 | #include "transaction.h" |
| 35 | #include "btrfs_inode.h" |
| 36 | #include "ioctl.h" |
| 37 | #include "print-tree.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 38 | #include "tree-log.h" |
| 39 | #include "locking.h" |
Jeff Mahoney | 12fa8ec | 2008-05-02 15:03:58 -0400 | [diff] [blame] | 40 | #include "compat.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 41 | |
| 42 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 43 | /* simple helper to fault in pages and copy. This should go away |
| 44 | * and be replaced with calls into generic code. |
| 45 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 46 | 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] | 47 | int write_bytes, |
| 48 | struct page **prepared_pages, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 49 | const char __user *buf) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 50 | { |
| 51 | long page_fault = 0; |
| 52 | int i; |
| 53 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 54 | |
| 55 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { |
| 56 | size_t count = min_t(size_t, |
| 57 | PAGE_CACHE_SIZE - offset, write_bytes); |
| 58 | struct page *page = prepared_pages[i]; |
| 59 | fault_in_pages_readable(buf, count); |
| 60 | |
| 61 | /* Copy data from userspace to the current page */ |
| 62 | kmap(page); |
| 63 | page_fault = __copy_from_user(page_address(page) + offset, |
| 64 | buf, count); |
| 65 | /* Flush processor's dcache for this page */ |
| 66 | flush_dcache_page(page); |
| 67 | kunmap(page); |
| 68 | buf += count; |
| 69 | write_bytes -= count; |
| 70 | |
| 71 | if (page_fault) |
| 72 | break; |
| 73 | } |
| 74 | return page_fault ? -EFAULT : 0; |
| 75 | } |
| 76 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 77 | /* |
| 78 | * unlocks pages after btrfs_file_write is done with them |
| 79 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 80 | 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] | 81 | { |
| 82 | size_t i; |
| 83 | for (i = 0; i < num_pages; i++) { |
| 84 | if (!pages[i]) |
| 85 | break; |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 86 | /* page checked is some magic around finding pages that |
| 87 | * have been modified without going through btrfs_set_page_dirty |
| 88 | * clear it here |
| 89 | */ |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 90 | ClearPageChecked(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 91 | unlock_page(pages[i]); |
| 92 | mark_page_accessed(pages[i]); |
| 93 | page_cache_release(pages[i]); |
| 94 | } |
| 95 | } |
| 96 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 97 | /* |
| 98 | * after copy_from_user, pages need to be dirtied and we need to make |
| 99 | * sure holes are created between the current EOF and the start of |
| 100 | * any next extents (if required). |
| 101 | * |
| 102 | * this also makes the decision about creating an inline extent vs |
| 103 | * doing real data extents, marking pages dirty and delalloc as required. |
| 104 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 105 | static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 106 | struct btrfs_root *root, |
| 107 | struct file *file, |
| 108 | struct page **pages, |
| 109 | size_t num_pages, |
| 110 | loff_t pos, |
| 111 | size_t write_bytes) |
| 112 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 113 | int err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 114 | int i; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 115 | struct inode *inode = fdentry(file)->d_inode; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 116 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 117 | u64 hint_byte; |
| 118 | u64 num_bytes; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 119 | u64 start_pos; |
| 120 | u64 end_of_last_block; |
| 121 | u64 end_pos = pos + write_bytes; |
| 122 | loff_t isize = i_size_read(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 123 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 124 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 125 | num_bytes = (write_bytes + pos - start_pos + |
| 126 | root->sectorsize - 1) & ~((u64)root->sectorsize - 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 127 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 128 | end_of_last_block = start_pos + num_bytes - 1; |
| 129 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 130 | lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 131 | trans = btrfs_join_transaction(root, 1); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 132 | if (!trans) { |
| 133 | err = -ENOMEM; |
| 134 | goto out_unlock; |
| 135 | } |
| 136 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 137 | hint_byte = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 138 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 139 | set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 140 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 141 | /* check for reserved extents on each page, we don't want |
| 142 | * to reset the delalloc bit on things that already have |
| 143 | * extents reserved. |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 144 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 145 | btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block); |
| 146 | for (i = 0; i < num_pages; i++) { |
| 147 | struct page *p = pages[i]; |
| 148 | SetPageUptodate(p); |
| 149 | ClearPageChecked(p); |
| 150 | set_page_dirty(p); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 151 | } |
| 152 | if (end_pos > isize) { |
| 153 | i_size_write(inode, end_pos); |
Chris Mason | f597bb1 | 2009-06-27 21:06:22 -0400 | [diff] [blame] | 154 | /* we've only changed i_size in ram, and we haven't updated |
| 155 | * the disk i_size. There is no need to log the inode |
| 156 | * at this time. |
| 157 | */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 158 | } |
Chris Mason | 017e536 | 2008-07-28 15:32:51 -0400 | [diff] [blame] | 159 | err = btrfs_end_transaction(trans, root); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 160 | out_unlock: |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 161 | unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 162 | return err; |
| 163 | } |
| 164 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 165 | /* |
| 166 | * this drops all the extents in the cache that intersect the range |
| 167 | * [start, end]. Existing extents are split as required. |
| 168 | */ |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 169 | int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, |
| 170 | int skip_pinned) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 171 | { |
| 172 | struct extent_map *em; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 173 | struct extent_map *split = NULL; |
| 174 | struct extent_map *split2 = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 175 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 176 | u64 len = end - start + 1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 177 | int ret; |
| 178 | int testend = 1; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 179 | unsigned long flags; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 180 | int compressed = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 181 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 182 | WARN_ON(end < start); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 183 | if (end == (u64)-1) { |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 184 | len = (u64)-1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 185 | testend = 0; |
| 186 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 187 | while (1) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 188 | if (!split) |
| 189 | split = alloc_extent_map(GFP_NOFS); |
| 190 | if (!split2) |
| 191 | split2 = alloc_extent_map(GFP_NOFS); |
| 192 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 193 | spin_lock(&em_tree->lock); |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 194 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 195 | if (!em) { |
| 196 | spin_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 197 | break; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 198 | } |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 199 | flags = em->flags; |
| 200 | if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { |
| 201 | spin_unlock(&em_tree->lock); |
| 202 | if (em->start <= start && |
| 203 | (!testend || em->start + em->len >= start + len)) { |
| 204 | free_extent_map(em); |
| 205 | break; |
| 206 | } |
| 207 | if (start < em->start) { |
| 208 | len = em->start - start; |
| 209 | } else { |
| 210 | len = start + len - (em->start + em->len); |
| 211 | start = em->start + em->len; |
| 212 | } |
| 213 | free_extent_map(em); |
| 214 | continue; |
| 215 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 216 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Chris Mason | 3ce7e67 | 2008-07-31 15:42:54 -0400 | [diff] [blame] | 217 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 218 | remove_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 219 | |
| 220 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 221 | em->start < start) { |
| 222 | split->start = em->start; |
| 223 | split->len = start - em->start; |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 224 | split->orig_start = em->orig_start; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 225 | split->block_start = em->block_start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 226 | |
| 227 | if (compressed) |
| 228 | split->block_len = em->block_len; |
| 229 | else |
| 230 | split->block_len = split->len; |
| 231 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 232 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 233 | split->flags = flags; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 234 | ret = add_extent_mapping(em_tree, split); |
| 235 | BUG_ON(ret); |
| 236 | free_extent_map(split); |
| 237 | split = split2; |
| 238 | split2 = NULL; |
| 239 | } |
| 240 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 241 | testend && em->start + em->len > start + len) { |
| 242 | u64 diff = start + len - em->start; |
| 243 | |
| 244 | split->start = start + len; |
| 245 | split->len = em->start + em->len - (start + len); |
| 246 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 247 | split->flags = flags; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 248 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 249 | if (compressed) { |
| 250 | split->block_len = em->block_len; |
| 251 | split->block_start = em->block_start; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 252 | split->orig_start = em->orig_start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 253 | } else { |
| 254 | split->block_len = split->len; |
| 255 | split->block_start = em->block_start + diff; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 256 | split->orig_start = split->start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 257 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 258 | |
| 259 | ret = add_extent_mapping(em_tree, split); |
| 260 | BUG_ON(ret); |
| 261 | free_extent_map(split); |
| 262 | split = NULL; |
| 263 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 264 | spin_unlock(&em_tree->lock); |
| 265 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 266 | /* once for us */ |
| 267 | free_extent_map(em); |
| 268 | /* once for the tree*/ |
| 269 | free_extent_map(em); |
| 270 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 271 | if (split) |
| 272 | free_extent_map(split); |
| 273 | if (split2) |
| 274 | free_extent_map(split2); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 275 | return 0; |
| 276 | } |
| 277 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 278 | /* |
| 279 | * this is very complex, but the basic idea is to drop all extents |
| 280 | * in the range start - end. hint_block is filled in with a block number |
| 281 | * that would be a good hint to the block allocator for this file. |
| 282 | * |
| 283 | * If an extent intersects the range but is not entirely inside the range |
| 284 | * it is either truncated or split. Anything entirely inside the range |
| 285 | * is deleted from the tree. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 286 | * |
| 287 | * inline_limit is used to tell this code which offsets in the file to keep |
| 288 | * if they contain inline extents. |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 289 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 290 | noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 291 | struct btrfs_root *root, struct inode *inode, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 292 | u64 start, u64 end, u64 locked_end, |
| 293 | u64 inline_limit, u64 *hint_byte) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 294 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 295 | u64 extent_end = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 296 | u64 search_start = start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 297 | u64 ram_bytes = 0; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 298 | u64 disk_bytenr = 0; |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 299 | u64 orig_locked_end = locked_end; |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 300 | u8 compression; |
| 301 | u8 encryption; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 302 | u16 other_encoding = 0; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 303 | struct extent_buffer *leaf; |
| 304 | struct btrfs_file_extent_item *extent; |
| 305 | struct btrfs_path *path; |
| 306 | struct btrfs_key key; |
| 307 | struct btrfs_file_extent_item old; |
| 308 | int keep; |
| 309 | int slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 310 | int bookend; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 311 | int found_type = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 312 | int found_extent; |
| 313 | int found_inline; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 314 | int recow; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 315 | int ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 316 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 317 | inline_limit = 0; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 318 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 319 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 320 | path = btrfs_alloc_path(); |
| 321 | if (!path) |
| 322 | return -ENOMEM; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 323 | while (1) { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 324 | recow = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 325 | btrfs_release_path(root, path); |
| 326 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, |
| 327 | search_start, -1); |
| 328 | if (ret < 0) |
| 329 | goto out; |
| 330 | if (ret > 0) { |
| 331 | if (path->slots[0] == 0) { |
| 332 | ret = 0; |
| 333 | goto out; |
| 334 | } |
| 335 | path->slots[0]--; |
| 336 | } |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 337 | next_slot: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 338 | keep = 0; |
| 339 | bookend = 0; |
| 340 | found_extent = 0; |
| 341 | found_inline = 0; |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 342 | compression = 0; |
| 343 | encryption = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 344 | extent = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 345 | leaf = path->nodes[0]; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 346 | slot = path->slots[0]; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 347 | ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 348 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Yan | 7261009 | 2008-02-05 15:40:36 -0500 | [diff] [blame] | 349 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY && |
| 350 | key.offset >= end) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 351 | goto out; |
| 352 | } |
Yan | 7261009 | 2008-02-05 15:40:36 -0500 | [diff] [blame] | 353 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
| 354 | key.objectid != inode->i_ino) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 355 | goto out; |
| 356 | } |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 357 | if (recow) { |
Yan Zheng | 8247b41 | 2008-11-11 09:33:29 -0500 | [diff] [blame] | 358 | search_start = max(key.offset, start); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 359 | continue; |
| 360 | } |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 361 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
| 362 | extent = btrfs_item_ptr(leaf, slot, |
| 363 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 364 | found_type = btrfs_file_extent_type(leaf, extent); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 365 | compression = btrfs_file_extent_compression(leaf, |
| 366 | extent); |
| 367 | encryption = btrfs_file_extent_encryption(leaf, |
| 368 | extent); |
| 369 | other_encoding = btrfs_file_extent_other_encoding(leaf, |
| 370 | extent); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 371 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 372 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 373 | extent_end = |
| 374 | btrfs_file_extent_disk_bytenr(leaf, |
| 375 | extent); |
| 376 | if (extent_end) |
| 377 | *hint_byte = extent_end; |
| 378 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 379 | extent_end = key.offset + |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 380 | btrfs_file_extent_num_bytes(leaf, extent); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 381 | ram_bytes = btrfs_file_extent_ram_bytes(leaf, |
| 382 | extent); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 383 | found_extent = 1; |
| 384 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
| 385 | found_inline = 1; |
| 386 | extent_end = key.offset + |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 387 | btrfs_file_extent_inline_len(leaf, extent); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 388 | } |
| 389 | } else { |
| 390 | extent_end = search_start; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | /* we found nothing we can drop */ |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 394 | if ((!found_extent && !found_inline) || |
| 395 | search_start >= extent_end) { |
| 396 | int nextret; |
| 397 | u32 nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 398 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 399 | if (slot >= nritems - 1) { |
| 400 | nextret = btrfs_next_leaf(root, path); |
| 401 | if (nextret) |
| 402 | goto out; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 403 | recow = 1; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 404 | } else { |
| 405 | path->slots[0]++; |
| 406 | } |
| 407 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 408 | } |
| 409 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 410 | if (end <= extent_end && start >= key.offset && found_inline) |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 411 | *hint_byte = EXTENT_MAP_INLINE; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 412 | |
| 413 | if (found_extent) { |
| 414 | read_extent_buffer(leaf, &old, (unsigned long)extent, |
| 415 | sizeof(old)); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 416 | } |
| 417 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 418 | if (end < extent_end && end >= key.offset) { |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 419 | bookend = 1; |
Yan | 0181e58 | 2008-01-30 14:39:54 -0500 | [diff] [blame] | 420 | if (found_inline && start <= key.offset) |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 421 | keep = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 422 | } |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 423 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 424 | if (bookend && found_extent) { |
| 425 | if (locked_end < extent_end) { |
| 426 | ret = try_lock_extent(&BTRFS_I(inode)->io_tree, |
| 427 | locked_end, extent_end - 1, |
| 428 | GFP_NOFS); |
| 429 | if (!ret) { |
| 430 | btrfs_release_path(root, path); |
| 431 | lock_extent(&BTRFS_I(inode)->io_tree, |
| 432 | locked_end, extent_end - 1, |
| 433 | GFP_NOFS); |
| 434 | locked_end = extent_end; |
| 435 | continue; |
| 436 | } |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 437 | locked_end = extent_end; |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 438 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 439 | disk_bytenr = le64_to_cpu(old.disk_bytenr); |
| 440 | if (disk_bytenr != 0) { |
| 441 | ret = btrfs_inc_extent_ref(trans, root, |
| 442 | disk_bytenr, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 443 | le64_to_cpu(old.disk_num_bytes), 0, |
| 444 | root->root_key.objectid, |
| 445 | key.objectid, key.offset - |
| 446 | le64_to_cpu(old.offset)); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 447 | BUG_ON(ret); |
| 448 | } |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | if (found_inline) { |
| 452 | u64 mask = root->sectorsize - 1; |
| 453 | search_start = (extent_end + mask) & ~mask; |
| 454 | } else |
| 455 | search_start = extent_end; |
| 456 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 457 | /* truncate existing extent */ |
| 458 | if (start > key.offset) { |
| 459 | u64 new_num; |
| 460 | u64 old_num; |
| 461 | keep = 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 462 | WARN_ON(start & (root->sectorsize - 1)); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 463 | if (found_extent) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 464 | new_num = start - key.offset; |
| 465 | old_num = btrfs_file_extent_num_bytes(leaf, |
| 466 | extent); |
| 467 | *hint_byte = |
| 468 | btrfs_file_extent_disk_bytenr(leaf, |
| 469 | extent); |
| 470 | if (btrfs_file_extent_disk_bytenr(leaf, |
| 471 | extent)) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 472 | inode_sub_bytes(inode, old_num - |
| 473 | new_num); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 474 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 475 | btrfs_set_file_extent_num_bytes(leaf, |
| 476 | extent, new_num); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 477 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 478 | } else if (key.offset < inline_limit && |
| 479 | (end > extent_end) && |
| 480 | (inline_limit < extent_end)) { |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 481 | u32 new_size; |
| 482 | new_size = btrfs_file_extent_calc_inline_size( |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 483 | inline_limit - key.offset); |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 484 | inode_sub_bytes(inode, extent_end - |
| 485 | inline_limit); |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 486 | btrfs_set_file_extent_ram_bytes(leaf, extent, |
| 487 | new_size); |
| 488 | if (!compression && !encryption) { |
| 489 | btrfs_truncate_item(trans, root, path, |
| 490 | new_size, 1); |
| 491 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 492 | } |
| 493 | } |
| 494 | /* delete the entire extent */ |
| 495 | if (!keep) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 496 | if (found_inline) |
| 497 | inode_sub_bytes(inode, extent_end - |
| 498 | key.offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 499 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 500 | /* TODO update progress marker and return */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 501 | BUG_ON(ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 502 | extent = NULL; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 503 | btrfs_release_path(root, path); |
| 504 | /* the extent will be freed later */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 505 | } |
Yan | 0181e58 | 2008-01-30 14:39:54 -0500 | [diff] [blame] | 506 | if (bookend && found_inline && start <= key.offset) { |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 507 | u32 new_size; |
| 508 | new_size = btrfs_file_extent_calc_inline_size( |
Yan | 0181e58 | 2008-01-30 14:39:54 -0500 | [diff] [blame] | 509 | extent_end - end); |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 510 | inode_sub_bytes(inode, end - key.offset); |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 511 | btrfs_set_file_extent_ram_bytes(leaf, extent, |
| 512 | new_size); |
| 513 | if (!compression && !encryption) |
| 514 | ret = btrfs_truncate_item(trans, root, path, |
| 515 | new_size, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 516 | BUG_ON(ret); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 517 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 518 | /* create bookend, splitting the extent in two */ |
| 519 | if (bookend && found_extent) { |
| 520 | struct btrfs_key ins; |
| 521 | ins.objectid = inode->i_ino; |
| 522 | ins.offset = end; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 523 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 524 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 525 | btrfs_release_path(root, path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 526 | path->leave_spinning = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 527 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
| 528 | sizeof(*extent)); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 529 | BUG_ON(ret); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 530 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 531 | leaf = path->nodes[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 532 | extent = btrfs_item_ptr(leaf, path->slots[0], |
| 533 | struct btrfs_file_extent_item); |
| 534 | write_extent_buffer(leaf, &old, |
| 535 | (unsigned long)extent, sizeof(old)); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 536 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 537 | btrfs_set_file_extent_compression(leaf, extent, |
| 538 | compression); |
| 539 | btrfs_set_file_extent_encryption(leaf, extent, |
| 540 | encryption); |
| 541 | btrfs_set_file_extent_other_encoding(leaf, extent, |
| 542 | other_encoding); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 543 | btrfs_set_file_extent_offset(leaf, extent, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 544 | le64_to_cpu(old.offset) + end - key.offset); |
| 545 | WARN_ON(le64_to_cpu(old.num_bytes) < |
| 546 | (extent_end - end)); |
| 547 | btrfs_set_file_extent_num_bytes(leaf, extent, |
| 548 | extent_end - end); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 549 | |
| 550 | /* |
| 551 | * set the ram bytes to the size of the full extent |
| 552 | * before splitting. This is a worst case flag, |
| 553 | * but its the best we can do because we don't know |
| 554 | * how splitting affects compression |
| 555 | */ |
| 556 | btrfs_set_file_extent_ram_bytes(leaf, extent, |
| 557 | ram_bytes); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 558 | btrfs_set_file_extent_type(leaf, extent, found_type); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 559 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 560 | btrfs_unlock_up_safe(path, 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 561 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 562 | btrfs_set_lock_blocking(path->nodes[0]); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 563 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 564 | path->leave_spinning = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 565 | btrfs_release_path(root, path); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 566 | if (disk_bytenr != 0) |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 567 | inode_add_bytes(inode, extent_end - end); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 568 | } |
| 569 | |
| 570 | if (found_extent && !keep) { |
Christoph Hellwig | 6e430f9 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 571 | u64 old_disk_bytenr = le64_to_cpu(old.disk_bytenr); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 572 | |
Christoph Hellwig | 6e430f9 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 573 | if (old_disk_bytenr != 0) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 574 | inode_sub_bytes(inode, |
| 575 | le64_to_cpu(old.num_bytes)); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 576 | ret = btrfs_free_extent(trans, root, |
Christoph Hellwig | 6e430f9 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 577 | old_disk_bytenr, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 578 | le64_to_cpu(old.disk_num_bytes), |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 579 | 0, root->root_key.objectid, |
| 580 | key.objectid, key.offset - |
| 581 | le64_to_cpu(old.offset)); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 582 | BUG_ON(ret); |
Christoph Hellwig | 6e430f9 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 583 | *hint_byte = old_disk_bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 584 | } |
| 585 | } |
| 586 | |
| 587 | if (search_start >= end) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 588 | ret = 0; |
| 589 | goto out; |
| 590 | } |
| 591 | } |
| 592 | out: |
| 593 | btrfs_free_path(path); |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 594 | if (locked_end > orig_locked_end) { |
| 595 | unlock_extent(&BTRFS_I(inode)->io_tree, orig_locked_end, |
| 596 | locked_end - 1, GFP_NOFS); |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 597 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 598 | return ret; |
| 599 | } |
| 600 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 601 | static int extent_mergeable(struct extent_buffer *leaf, int slot, |
| 602 | u64 objectid, u64 bytenr, u64 *start, u64 *end) |
| 603 | { |
| 604 | struct btrfs_file_extent_item *fi; |
| 605 | struct btrfs_key key; |
| 606 | u64 extent_end; |
| 607 | |
| 608 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) |
| 609 | return 0; |
| 610 | |
| 611 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 612 | if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) |
| 613 | return 0; |
| 614 | |
| 615 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 616 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG || |
| 617 | btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr || |
| 618 | btrfs_file_extent_compression(leaf, fi) || |
| 619 | btrfs_file_extent_encryption(leaf, fi) || |
| 620 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 621 | return 0; |
| 622 | |
| 623 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 624 | if ((*start && *start != key.offset) || (*end && *end != extent_end)) |
| 625 | return 0; |
| 626 | |
| 627 | *start = key.offset; |
| 628 | *end = extent_end; |
| 629 | return 1; |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Mark extent in the range start - end as written. |
| 634 | * |
| 635 | * This changes extent type from 'pre-allocated' to 'regular'. If only |
| 636 | * part of extent is marked as written, the extent will be split into |
| 637 | * two or three. |
| 638 | */ |
| 639 | int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, |
| 640 | struct btrfs_root *root, |
| 641 | struct inode *inode, u64 start, u64 end) |
| 642 | { |
| 643 | struct extent_buffer *leaf; |
| 644 | struct btrfs_path *path; |
| 645 | struct btrfs_file_extent_item *fi; |
| 646 | struct btrfs_key key; |
| 647 | u64 bytenr; |
| 648 | u64 num_bytes; |
| 649 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 650 | u64 orig_offset; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 651 | u64 other_start; |
| 652 | u64 other_end; |
| 653 | u64 split = start; |
| 654 | u64 locked_end = end; |
| 655 | int extent_type; |
| 656 | int split_end = 1; |
| 657 | int ret; |
| 658 | |
| 659 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
| 660 | |
| 661 | path = btrfs_alloc_path(); |
| 662 | BUG_ON(!path); |
| 663 | again: |
| 664 | key.objectid = inode->i_ino; |
| 665 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 666 | if (split == start) |
| 667 | key.offset = split; |
| 668 | else |
| 669 | key.offset = split - 1; |
| 670 | |
| 671 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 672 | if (ret > 0 && path->slots[0] > 0) |
| 673 | path->slots[0]--; |
| 674 | |
| 675 | leaf = path->nodes[0]; |
| 676 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 677 | BUG_ON(key.objectid != inode->i_ino || |
| 678 | key.type != BTRFS_EXTENT_DATA_KEY); |
| 679 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 680 | struct btrfs_file_extent_item); |
| 681 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 682 | BUG_ON(extent_type != BTRFS_FILE_EXTENT_PREALLOC); |
| 683 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 684 | BUG_ON(key.offset > start || extent_end < end); |
| 685 | |
| 686 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 687 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 688 | orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 689 | |
| 690 | if (key.offset == start) |
| 691 | split = end; |
| 692 | |
| 693 | if (key.offset == start && extent_end == end) { |
| 694 | int del_nr = 0; |
| 695 | int del_slot = 0; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 696 | other_start = end; |
| 697 | other_end = 0; |
| 698 | if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino, |
| 699 | bytenr, &other_start, &other_end)) { |
| 700 | extent_end = other_end; |
| 701 | del_slot = path->slots[0] + 1; |
| 702 | del_nr++; |
| 703 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 704 | 0, root->root_key.objectid, |
| 705 | inode->i_ino, orig_offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 706 | BUG_ON(ret); |
| 707 | } |
| 708 | other_start = 0; |
| 709 | other_end = start; |
| 710 | if (extent_mergeable(leaf, path->slots[0] - 1, inode->i_ino, |
| 711 | bytenr, &other_start, &other_end)) { |
| 712 | key.offset = other_start; |
| 713 | del_slot = path->slots[0]; |
| 714 | del_nr++; |
| 715 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 716 | 0, root->root_key.objectid, |
| 717 | inode->i_ino, orig_offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 718 | BUG_ON(ret); |
| 719 | } |
| 720 | split_end = 0; |
| 721 | if (del_nr == 0) { |
| 722 | btrfs_set_file_extent_type(leaf, fi, |
| 723 | BTRFS_FILE_EXTENT_REG); |
| 724 | goto done; |
| 725 | } |
| 726 | |
| 727 | fi = btrfs_item_ptr(leaf, del_slot - 1, |
| 728 | struct btrfs_file_extent_item); |
| 729 | btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG); |
| 730 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 731 | extent_end - key.offset); |
| 732 | btrfs_mark_buffer_dirty(leaf); |
| 733 | |
| 734 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
| 735 | BUG_ON(ret); |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 736 | goto release; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 737 | } else if (split == start) { |
| 738 | if (locked_end < extent_end) { |
| 739 | ret = try_lock_extent(&BTRFS_I(inode)->io_tree, |
| 740 | locked_end, extent_end - 1, GFP_NOFS); |
| 741 | if (!ret) { |
| 742 | btrfs_release_path(root, path); |
| 743 | lock_extent(&BTRFS_I(inode)->io_tree, |
| 744 | locked_end, extent_end - 1, GFP_NOFS); |
| 745 | locked_end = extent_end; |
| 746 | goto again; |
| 747 | } |
| 748 | locked_end = extent_end; |
| 749 | } |
| 750 | btrfs_set_file_extent_num_bytes(leaf, fi, split - key.offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 751 | } else { |
| 752 | BUG_ON(key.offset != start); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 753 | key.offset = split; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 754 | btrfs_set_file_extent_offset(leaf, fi, key.offset - |
| 755 | orig_offset); |
| 756 | btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - split); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 757 | btrfs_set_item_key_safe(trans, root, path, &key); |
| 758 | extent_end = split; |
| 759 | } |
| 760 | |
| 761 | if (extent_end == end) { |
| 762 | split_end = 0; |
| 763 | extent_type = BTRFS_FILE_EXTENT_REG; |
| 764 | } |
| 765 | if (extent_end == end && split == start) { |
| 766 | other_start = end; |
| 767 | other_end = 0; |
| 768 | if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino, |
| 769 | bytenr, &other_start, &other_end)) { |
| 770 | path->slots[0]++; |
| 771 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 772 | struct btrfs_file_extent_item); |
| 773 | key.offset = split; |
| 774 | btrfs_set_item_key_safe(trans, root, path, &key); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 775 | btrfs_set_file_extent_offset(leaf, fi, key.offset - |
| 776 | orig_offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 777 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 778 | other_end - split); |
| 779 | goto done; |
| 780 | } |
| 781 | } |
| 782 | if (extent_end == end && split == end) { |
| 783 | other_start = 0; |
| 784 | other_end = start; |
| 785 | if (extent_mergeable(leaf, path->slots[0] - 1 , inode->i_ino, |
| 786 | bytenr, &other_start, &other_end)) { |
| 787 | path->slots[0]--; |
| 788 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 789 | struct btrfs_file_extent_item); |
| 790 | btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - |
| 791 | other_start); |
| 792 | goto done; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | c36047d | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 797 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 798 | ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, |
| 799 | root->root_key.objectid, |
| 800 | inode->i_ino, orig_offset); |
Yan Zheng | c36047d | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 801 | BUG_ON(ret); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 802 | btrfs_release_path(root, path); |
| 803 | |
| 804 | key.offset = start; |
| 805 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*fi)); |
| 806 | BUG_ON(ret); |
| 807 | |
| 808 | leaf = path->nodes[0]; |
| 809 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 810 | struct btrfs_file_extent_item); |
| 811 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
| 812 | btrfs_set_file_extent_type(leaf, fi, extent_type); |
| 813 | btrfs_set_file_extent_disk_bytenr(leaf, fi, bytenr); |
| 814 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 815 | btrfs_set_file_extent_offset(leaf, fi, key.offset - orig_offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 816 | btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - key.offset); |
| 817 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); |
| 818 | btrfs_set_file_extent_compression(leaf, fi, 0); |
| 819 | btrfs_set_file_extent_encryption(leaf, fi, 0); |
| 820 | btrfs_set_file_extent_other_encoding(leaf, fi, 0); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 821 | done: |
| 822 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 823 | |
| 824 | release: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 825 | btrfs_release_path(root, path); |
| 826 | if (split_end && split == start) { |
| 827 | split = end; |
| 828 | goto again; |
| 829 | } |
| 830 | if (locked_end > end) { |
| 831 | unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1, |
| 832 | GFP_NOFS); |
| 833 | } |
| 834 | btrfs_free_path(path); |
| 835 | return 0; |
| 836 | } |
| 837 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 838 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 839 | * this gets pages into the page cache and locks them down, it also properly |
| 840 | * waits for data=ordered extents to finish before allowing the pages to be |
| 841 | * modified. |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 842 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 843 | static noinline int prepare_pages(struct btrfs_root *root, struct file *file, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 844 | struct page **pages, size_t num_pages, |
| 845 | loff_t pos, unsigned long first_index, |
| 846 | unsigned long last_index, size_t write_bytes) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 847 | { |
| 848 | int i; |
| 849 | unsigned long index = pos >> PAGE_CACHE_SHIFT; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 850 | struct inode *inode = fdentry(file)->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 851 | int err = 0; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 852 | u64 start_pos; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 853 | u64 last_pos; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 854 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 855 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 856 | last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 857 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 858 | if (start_pos > inode->i_size) { |
| 859 | err = btrfs_cont_expand(inode, start_pos); |
| 860 | if (err) |
| 861 | return err; |
| 862 | } |
| 863 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 864 | memset(pages, 0, num_pages * sizeof(struct page *)); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 865 | again: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 866 | for (i = 0; i < num_pages; i++) { |
| 867 | pages[i] = grab_cache_page(inode->i_mapping, index + i); |
| 868 | if (!pages[i]) { |
| 869 | err = -ENOMEM; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 870 | BUG_ON(1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 871 | } |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 872 | wait_on_page_writeback(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 873 | } |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 874 | if (start_pos < inode->i_size) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 875 | struct btrfs_ordered_extent *ordered; |
Chris Mason | d99cb30 | 2008-02-19 12:55:05 -0500 | [diff] [blame] | 876 | lock_extent(&BTRFS_I(inode)->io_tree, |
| 877 | start_pos, last_pos - 1, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 878 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 879 | last_pos - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 880 | if (ordered && |
| 881 | ordered->file_offset + ordered->len > start_pos && |
| 882 | ordered->file_offset < last_pos) { |
| 883 | btrfs_put_ordered_extent(ordered); |
| 884 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 885 | start_pos, last_pos - 1, GFP_NOFS); |
| 886 | for (i = 0; i < num_pages; i++) { |
| 887 | unlock_page(pages[i]); |
| 888 | page_cache_release(pages[i]); |
| 889 | } |
| 890 | btrfs_wait_ordered_range(inode, start_pos, |
| 891 | last_pos - start_pos); |
| 892 | goto again; |
| 893 | } |
| 894 | if (ordered) |
| 895 | btrfs_put_ordered_extent(ordered); |
| 896 | |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 897 | clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos, |
| 898 | last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC, |
| 899 | GFP_NOFS); |
Chris Mason | d99cb30 | 2008-02-19 12:55:05 -0500 | [diff] [blame] | 900 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 901 | start_pos, last_pos - 1, GFP_NOFS); |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 902 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 903 | for (i = 0; i < num_pages; i++) { |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 904 | clear_page_dirty_for_io(pages[i]); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 905 | set_page_extent_mapped(pages[i]); |
| 906 | WARN_ON(!PageLocked(pages[i])); |
| 907 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 908 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 909 | } |
| 910 | |
| 911 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, |
| 912 | size_t count, loff_t *ppos) |
| 913 | { |
| 914 | loff_t pos; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 915 | loff_t start_pos; |
| 916 | ssize_t num_written = 0; |
| 917 | ssize_t err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 918 | int ret = 0; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 919 | struct inode *inode = fdentry(file)->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 920 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 921 | struct page **pages = NULL; |
| 922 | int nrptrs; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 923 | struct page *pinned[2]; |
| 924 | unsigned long first_index; |
| 925 | unsigned long last_index; |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 926 | int will_write; |
| 927 | |
| 928 | will_write = ((file->f_flags & O_SYNC) || IS_SYNC(inode) || |
| 929 | (file->f_flags & O_DIRECT)); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 930 | |
| 931 | nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE, |
| 932 | PAGE_CACHE_SIZE / (sizeof(struct page *))); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 933 | pinned[0] = NULL; |
| 934 | pinned[1] = NULL; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 935 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 936 | pos = *ppos; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 937 | start_pos = pos; |
| 938 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 939 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
| 940 | current->backing_dev_info = inode->i_mapping->backing_dev_info; |
| 941 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); |
| 942 | if (err) |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 943 | goto out_nolock; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 944 | if (count == 0) |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 945 | goto out_nolock; |
Chris Mason | 2b1f55b | 2008-09-24 11:48:04 -0400 | [diff] [blame] | 946 | |
Sven Wegener | 0ee0fda | 2008-07-30 16:54:26 -0400 | [diff] [blame] | 947 | err = file_remove_suid(file); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 948 | if (err) |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 949 | goto out_nolock; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 950 | file_update_time(file); |
| 951 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 952 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 953 | |
| 954 | mutex_lock(&inode->i_mutex); |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 955 | BTRFS_I(inode)->sequence++; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 956 | first_index = pos >> PAGE_CACHE_SHIFT; |
| 957 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; |
| 958 | |
| 959 | /* |
| 960 | * there are lots of better ways to do this, but this code |
| 961 | * makes sure the first and last page in the file range are |
| 962 | * up to date and ready for cow |
| 963 | */ |
| 964 | if ((pos & (PAGE_CACHE_SIZE - 1))) { |
| 965 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); |
| 966 | if (!PageUptodate(pinned[0])) { |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 967 | ret = btrfs_readpage(NULL, pinned[0]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 968 | BUG_ON(ret); |
| 969 | wait_on_page_locked(pinned[0]); |
| 970 | } else { |
| 971 | unlock_page(pinned[0]); |
| 972 | } |
| 973 | } |
| 974 | if ((pos + count) & (PAGE_CACHE_SIZE - 1)) { |
| 975 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); |
| 976 | if (!PageUptodate(pinned[1])) { |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 977 | ret = btrfs_readpage(NULL, pinned[1]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 978 | BUG_ON(ret); |
| 979 | wait_on_page_locked(pinned[1]); |
| 980 | } else { |
| 981 | unlock_page(pinned[1]); |
| 982 | } |
| 983 | } |
| 984 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 985 | while (count > 0) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 986 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
Chris Mason | 11bd143 | 2007-06-22 14:16:24 -0400 | [diff] [blame] | 987 | size_t write_bytes = min(count, nrptrs * |
| 988 | (size_t)PAGE_CACHE_SIZE - |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 989 | offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 990 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> |
| 991 | PAGE_CACHE_SHIFT; |
| 992 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 993 | WARN_ON(num_pages > nrptrs); |
yanhai zhu | 9aead43 | 2009-01-05 15:49:11 -0500 | [diff] [blame] | 994 | memset(pages, 0, sizeof(struct page *) * nrptrs); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 995 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 996 | ret = btrfs_check_data_free_space(root, inode, write_bytes); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 997 | if (ret) |
| 998 | goto out; |
| 999 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1000 | ret = prepare_pages(root, file, pages, num_pages, |
| 1001 | pos, first_index, last_index, |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1002 | write_bytes); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1003 | if (ret) { |
| 1004 | btrfs_free_reserved_data_space(root, inode, |
| 1005 | write_bytes); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1006 | goto out; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1007 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1008 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1009 | ret = btrfs_copy_from_user(pos, num_pages, |
| 1010 | write_bytes, pages, buf); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1011 | if (ret) { |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1012 | btrfs_free_reserved_data_space(root, inode, |
| 1013 | write_bytes); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1014 | btrfs_drop_pages(pages, num_pages); |
| 1015 | goto out; |
| 1016 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1017 | |
| 1018 | ret = dirty_and_release_pages(NULL, root, file, pages, |
| 1019 | num_pages, pos, write_bytes); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1020 | btrfs_drop_pages(pages, num_pages); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1021 | if (ret) { |
| 1022 | btrfs_free_reserved_data_space(root, inode, |
| 1023 | write_bytes); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1024 | goto out; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1025 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1026 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1027 | if (will_write) { |
| 1028 | btrfs_fdatawrite_range(inode->i_mapping, pos, |
| 1029 | pos + write_bytes - 1, |
Chris Mason | d313d7a | 2009-04-20 15:50:09 -0400 | [diff] [blame] | 1030 | WB_SYNC_ALL); |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1031 | } else { |
| 1032 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, |
| 1033 | num_pages); |
| 1034 | if (num_pages < |
| 1035 | (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
| 1036 | btrfs_btree_balance_dirty(root, 1); |
| 1037 | btrfs_throttle(root); |
| 1038 | } |
| 1039 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1040 | buf += write_bytes; |
| 1041 | count -= write_bytes; |
| 1042 | pos += write_bytes; |
| 1043 | num_written += write_bytes; |
| 1044 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1045 | cond_resched(); |
| 1046 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1047 | out: |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1048 | mutex_unlock(&inode->i_mutex); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1049 | if (ret) |
| 1050 | err = ret; |
Chris Mason | 5b92ee7 | 2008-01-03 13:46:11 -0500 | [diff] [blame] | 1051 | |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1052 | out_nolock: |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1053 | kfree(pages); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1054 | if (pinned[0]) |
| 1055 | page_cache_release(pinned[0]); |
| 1056 | if (pinned[1]) |
| 1057 | page_cache_release(pinned[1]); |
| 1058 | *ppos = pos; |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1059 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1060 | /* |
| 1061 | * we want to make sure fsync finds this change |
| 1062 | * but we haven't joined a transaction running right now. |
| 1063 | * |
| 1064 | * Later on, someone is sure to update the inode and get the |
| 1065 | * real transid recorded. |
| 1066 | * |
| 1067 | * We set last_trans now to the fs_info generation + 1, |
| 1068 | * this will either be one more than the running transaction |
| 1069 | * or the generation used for the next transaction if there isn't |
| 1070 | * one running right now. |
| 1071 | */ |
| 1072 | BTRFS_I(inode)->last_trans = root->fs_info->generation + 1; |
| 1073 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1074 | if (num_written > 0 && will_write) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1075 | struct btrfs_trans_handle *trans; |
| 1076 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1077 | err = btrfs_wait_ordered_range(inode, start_pos, num_written); |
| 1078 | if (err) |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1079 | num_written = err; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1080 | |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1081 | if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) { |
| 1082 | trans = btrfs_start_transaction(root, 1); |
| 1083 | ret = btrfs_log_dentry_safe(trans, root, |
| 1084 | file->f_dentry); |
| 1085 | if (ret == 0) { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1086 | ret = btrfs_sync_log(trans, root); |
| 1087 | if (ret == 0) |
| 1088 | btrfs_end_transaction(trans, root); |
| 1089 | else |
| 1090 | btrfs_commit_transaction(trans, root); |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1091 | } else { |
| 1092 | btrfs_commit_transaction(trans, root); |
| 1093 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1094 | } |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1095 | if (file->f_flags & O_DIRECT) { |
| 1096 | invalidate_mapping_pages(inode->i_mapping, |
| 1097 | start_pos >> PAGE_CACHE_SHIFT, |
| 1098 | (start_pos + num_written - 1) >> PAGE_CACHE_SHIFT); |
| 1099 | } |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1100 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1101 | current->backing_dev_info = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1102 | return num_written ? num_written : err; |
| 1103 | } |
| 1104 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1105 | int btrfs_release_file(struct inode *inode, struct file *filp) |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1106 | { |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1107 | /* |
| 1108 | * ordered_data_close is set by settattr when we are about to truncate |
| 1109 | * a file from a non-zero size to a zero size. This tries to |
| 1110 | * flush down new bytes that may have been written if the |
| 1111 | * application were using truncate to replace a file in place. |
| 1112 | */ |
| 1113 | if (BTRFS_I(inode)->ordered_data_close) { |
| 1114 | BTRFS_I(inode)->ordered_data_close = 0; |
| 1115 | btrfs_add_ordered_operation(NULL, BTRFS_I(inode)->root, inode); |
| 1116 | if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
| 1117 | filemap_flush(inode->i_mapping); |
| 1118 | } |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1119 | if (filp->private_data) |
| 1120 | btrfs_ioctl_trans_end(filp); |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1121 | return 0; |
| 1122 | } |
| 1123 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1124 | /* |
| 1125 | * fsync call for both files and directories. This logs the inode into |
| 1126 | * the tree log instead of forcing full commits whenever possible. |
| 1127 | * |
| 1128 | * It needs to call filemap_fdatawait so that all ordered extent updates are |
| 1129 | * in the metadata btree are up to date for copying to the log. |
| 1130 | * |
| 1131 | * It drops the inode mutex before doing the tree log commit. This is an |
| 1132 | * important optimization for directories because holding the mutex prevents |
| 1133 | * new operations on the dir while we write to disk. |
| 1134 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1135 | int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1136 | { |
| 1137 | struct inode *inode = dentry->d_inode; |
| 1138 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1139 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1140 | struct btrfs_trans_handle *trans; |
| 1141 | |
| 1142 | /* |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1143 | * check the transaction that last modified this inode |
| 1144 | * and see if its already been committed |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1145 | */ |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1146 | if (!BTRFS_I(inode)->last_trans) |
| 1147 | goto out; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1148 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1149 | mutex_lock(&root->fs_info->trans_mutex); |
| 1150 | if (BTRFS_I(inode)->last_trans <= |
| 1151 | root->fs_info->last_trans_committed) { |
| 1152 | BTRFS_I(inode)->last_trans = 0; |
| 1153 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1154 | goto out; |
| 1155 | } |
| 1156 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1157 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 1158 | root->log_batch++; |
Chris Mason | 580afd7 | 2008-12-08 19:15:39 -0500 | [diff] [blame] | 1159 | filemap_fdatawrite(inode->i_mapping); |
| 1160 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 1161 | root->log_batch++; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1162 | |
Hisashi Hifumi | 524724e | 2009-06-10 11:13:17 -0400 | [diff] [blame] | 1163 | if (datasync && !(inode->i_state & I_DIRTY_PAGES)) |
| 1164 | goto out; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1165 | /* |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1166 | * ok we haven't committed the transaction yet, lets do a commit |
| 1167 | */ |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1168 | if (file && file->private_data) |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1169 | btrfs_ioctl_trans_end(file); |
| 1170 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1171 | trans = btrfs_start_transaction(root, 1); |
| 1172 | if (!trans) { |
| 1173 | ret = -ENOMEM; |
| 1174 | goto out; |
| 1175 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1176 | |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1177 | ret = btrfs_log_dentry_safe(trans, root, dentry); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1178 | if (ret < 0) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1179 | goto out; |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1180 | |
| 1181 | /* we've logged all the items and now have a consistent |
| 1182 | * version of the file in the log. It is possible that |
| 1183 | * someone will come in and modify the file, but that's |
| 1184 | * fine because the log is consistent on disk, and we |
| 1185 | * have references to all of the file's extents |
| 1186 | * |
| 1187 | * It is possible that someone will come in and log the |
| 1188 | * file again, but that will end up using the synchronization |
| 1189 | * inside btrfs_sync_log to keep things safe. |
| 1190 | */ |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1191 | mutex_unlock(&dentry->d_inode->i_mutex); |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1192 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1193 | if (ret > 0) { |
| 1194 | ret = btrfs_commit_transaction(trans, root); |
| 1195 | } else { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1196 | ret = btrfs_sync_log(trans, root); |
| 1197 | if (ret == 0) |
| 1198 | ret = btrfs_end_transaction(trans, root); |
| 1199 | else |
| 1200 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1201 | } |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1202 | mutex_lock(&dentry->d_inode->i_mutex); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1203 | out: |
| 1204 | return ret > 0 ? EIO : ret; |
| 1205 | } |
| 1206 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1207 | static struct vm_operations_struct btrfs_file_vm_ops = { |
Chris Mason | 92fee66 | 2007-07-25 12:31:35 -0400 | [diff] [blame] | 1208 | .fault = filemap_fault, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1209 | .page_mkwrite = btrfs_page_mkwrite, |
| 1210 | }; |
| 1211 | |
| 1212 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
| 1213 | { |
| 1214 | vma->vm_ops = &btrfs_file_vm_ops; |
| 1215 | file_accessed(filp); |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1219 | struct file_operations btrfs_file_operations = { |
| 1220 | .llseek = generic_file_llseek, |
| 1221 | .read = do_sync_read, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1222 | .aio_read = generic_file_aio_read, |
Chris Mason | e9906a9 | 2007-12-14 12:56:58 -0500 | [diff] [blame] | 1223 | .splice_read = generic_file_splice_read, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1224 | .write = btrfs_file_write, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1225 | .mmap = btrfs_file_mmap, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1226 | .open = generic_file_open, |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1227 | .release = btrfs_release_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1228 | .fsync = btrfs_sync_file, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 1229 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1230 | #ifdef CONFIG_COMPAT |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 1231 | .compat_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1232 | #endif |
| 1233 | }; |