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> |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 27 | #include <linux/falloc.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 28 | #include <linux/swap.h> |
| 29 | #include <linux/writeback.h> |
| 30 | #include <linux/statfs.h> |
| 31 | #include <linux/compat.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 33 | #include "ctree.h" |
| 34 | #include "disk-io.h" |
| 35 | #include "transaction.h" |
| 36 | #include "btrfs_inode.h" |
| 37 | #include "ioctl.h" |
| 38 | #include "print-tree.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 39 | #include "tree-log.h" |
| 40 | #include "locking.h" |
Jeff Mahoney | 12fa8ec | 2008-05-02 15:03:58 -0400 | [diff] [blame] | 41 | #include "compat.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 42 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 43 | /* |
| 44 | * when auto defrag is enabled we |
| 45 | * queue up these defrag structs to remember which |
| 46 | * inodes need defragging passes |
| 47 | */ |
| 48 | struct inode_defrag { |
| 49 | struct rb_node rb_node; |
| 50 | /* objectid */ |
| 51 | u64 ino; |
| 52 | /* |
| 53 | * transid where the defrag was added, we search for |
| 54 | * extents newer than this |
| 55 | */ |
| 56 | u64 transid; |
| 57 | |
| 58 | /* root objectid */ |
| 59 | u64 root; |
| 60 | |
| 61 | /* last offset we were able to defrag */ |
| 62 | u64 last_offset; |
| 63 | |
| 64 | /* if we've wrapped around back to zero once already */ |
| 65 | int cycled; |
| 66 | }; |
| 67 | |
| 68 | /* pop a record for an inode into the defrag tree. The lock |
| 69 | * must be held already |
| 70 | * |
| 71 | * If you're inserting a record for an older transid than an |
| 72 | * existing record, the transid already in the tree is lowered |
| 73 | * |
| 74 | * If an existing record is found the defrag item you |
| 75 | * pass in is freed |
| 76 | */ |
Wanlong Gao | a0f98dd | 2011-07-18 12:19:35 +0000 | [diff] [blame] | 77 | static void __btrfs_add_inode_defrag(struct inode *inode, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 78 | struct inode_defrag *defrag) |
| 79 | { |
| 80 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 81 | struct inode_defrag *entry; |
| 82 | struct rb_node **p; |
| 83 | struct rb_node *parent = NULL; |
| 84 | |
| 85 | p = &root->fs_info->defrag_inodes.rb_node; |
| 86 | while (*p) { |
| 87 | parent = *p; |
| 88 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
| 89 | |
| 90 | if (defrag->ino < entry->ino) |
| 91 | p = &parent->rb_left; |
| 92 | else if (defrag->ino > entry->ino) |
| 93 | p = &parent->rb_right; |
| 94 | else { |
| 95 | /* if we're reinserting an entry for |
| 96 | * an old defrag run, make sure to |
| 97 | * lower the transid of our existing record |
| 98 | */ |
| 99 | if (defrag->transid < entry->transid) |
| 100 | entry->transid = defrag->transid; |
| 101 | if (defrag->last_offset > entry->last_offset) |
| 102 | entry->last_offset = defrag->last_offset; |
| 103 | goto exists; |
| 104 | } |
| 105 | } |
| 106 | BTRFS_I(inode)->in_defrag = 1; |
| 107 | rb_link_node(&defrag->rb_node, parent, p); |
| 108 | rb_insert_color(&defrag->rb_node, &root->fs_info->defrag_inodes); |
Wanlong Gao | a0f98dd | 2011-07-18 12:19:35 +0000 | [diff] [blame] | 109 | return; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 110 | |
| 111 | exists: |
| 112 | kfree(defrag); |
Wanlong Gao | a0f98dd | 2011-07-18 12:19:35 +0000 | [diff] [blame] | 113 | return; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 114 | |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * insert a defrag record for this inode if auto defrag is |
| 119 | * enabled |
| 120 | */ |
| 121 | int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, |
| 122 | struct inode *inode) |
| 123 | { |
| 124 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 125 | struct inode_defrag *defrag; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 126 | u64 transid; |
| 127 | |
| 128 | if (!btrfs_test_opt(root, AUTO_DEFRAG)) |
| 129 | return 0; |
| 130 | |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 131 | if (btrfs_fs_closing(root->fs_info)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 132 | return 0; |
| 133 | |
| 134 | if (BTRFS_I(inode)->in_defrag) |
| 135 | return 0; |
| 136 | |
| 137 | if (trans) |
| 138 | transid = trans->transid; |
| 139 | else |
| 140 | transid = BTRFS_I(inode)->root->last_trans; |
| 141 | |
| 142 | defrag = kzalloc(sizeof(*defrag), GFP_NOFS); |
| 143 | if (!defrag) |
| 144 | return -ENOMEM; |
| 145 | |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 146 | defrag->ino = btrfs_ino(inode); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 147 | defrag->transid = transid; |
| 148 | defrag->root = root->root_key.objectid; |
| 149 | |
| 150 | spin_lock(&root->fs_info->defrag_inodes_lock); |
| 151 | if (!BTRFS_I(inode)->in_defrag) |
Wanlong Gao | a0f98dd | 2011-07-18 12:19:35 +0000 | [diff] [blame] | 152 | __btrfs_add_inode_defrag(inode, defrag); |
Dan Carpenter | f4ac904 | 2011-08-05 14:19:00 +0000 | [diff] [blame] | 153 | else |
| 154 | kfree(defrag); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 155 | spin_unlock(&root->fs_info->defrag_inodes_lock); |
Wanlong Gao | a0f98dd | 2011-07-18 12:19:35 +0000 | [diff] [blame] | 156 | return 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /* |
| 160 | * must be called with the defrag_inodes lock held |
| 161 | */ |
| 162 | struct inode_defrag *btrfs_find_defrag_inode(struct btrfs_fs_info *info, u64 ino, |
| 163 | struct rb_node **next) |
| 164 | { |
| 165 | struct inode_defrag *entry = NULL; |
| 166 | struct rb_node *p; |
| 167 | struct rb_node *parent = NULL; |
| 168 | |
| 169 | p = info->defrag_inodes.rb_node; |
| 170 | while (p) { |
| 171 | parent = p; |
| 172 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
| 173 | |
| 174 | if (ino < entry->ino) |
| 175 | p = parent->rb_left; |
| 176 | else if (ino > entry->ino) |
| 177 | p = parent->rb_right; |
| 178 | else |
| 179 | return entry; |
| 180 | } |
| 181 | |
| 182 | if (next) { |
| 183 | while (parent && ino > entry->ino) { |
| 184 | parent = rb_next(parent); |
| 185 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
| 186 | } |
| 187 | *next = parent; |
| 188 | } |
| 189 | return NULL; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * run through the list of inodes in the FS that need |
| 194 | * defragging |
| 195 | */ |
| 196 | int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info) |
| 197 | { |
| 198 | struct inode_defrag *defrag; |
| 199 | struct btrfs_root *inode_root; |
| 200 | struct inode *inode; |
| 201 | struct rb_node *n; |
| 202 | struct btrfs_key key; |
| 203 | struct btrfs_ioctl_defrag_range_args range; |
| 204 | u64 first_ino = 0; |
| 205 | int num_defrag; |
| 206 | int defrag_batch = 1024; |
| 207 | |
| 208 | memset(&range, 0, sizeof(range)); |
| 209 | range.len = (u64)-1; |
| 210 | |
| 211 | atomic_inc(&fs_info->defrag_running); |
| 212 | spin_lock(&fs_info->defrag_inodes_lock); |
| 213 | while(1) { |
| 214 | n = NULL; |
| 215 | |
| 216 | /* find an inode to defrag */ |
| 217 | defrag = btrfs_find_defrag_inode(fs_info, first_ino, &n); |
| 218 | if (!defrag) { |
| 219 | if (n) |
| 220 | defrag = rb_entry(n, struct inode_defrag, rb_node); |
| 221 | else if (first_ino) { |
| 222 | first_ino = 0; |
| 223 | continue; |
| 224 | } else { |
| 225 | break; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | /* remove it from the rbtree */ |
| 230 | first_ino = defrag->ino + 1; |
| 231 | rb_erase(&defrag->rb_node, &fs_info->defrag_inodes); |
| 232 | |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 233 | if (btrfs_fs_closing(fs_info)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 234 | goto next_free; |
| 235 | |
| 236 | spin_unlock(&fs_info->defrag_inodes_lock); |
| 237 | |
| 238 | /* get the inode */ |
| 239 | key.objectid = defrag->root; |
| 240 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 241 | key.offset = (u64)-1; |
| 242 | inode_root = btrfs_read_fs_root_no_name(fs_info, &key); |
| 243 | if (IS_ERR(inode_root)) |
| 244 | goto next; |
| 245 | |
| 246 | key.objectid = defrag->ino; |
| 247 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 248 | key.offset = 0; |
| 249 | |
| 250 | inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL); |
| 251 | if (IS_ERR(inode)) |
| 252 | goto next; |
| 253 | |
| 254 | /* do a chunk of defrag */ |
| 255 | BTRFS_I(inode)->in_defrag = 0; |
| 256 | range.start = defrag->last_offset; |
| 257 | num_defrag = btrfs_defrag_file(inode, NULL, &range, defrag->transid, |
| 258 | defrag_batch); |
| 259 | /* |
| 260 | * if we filled the whole defrag batch, there |
| 261 | * must be more work to do. Queue this defrag |
| 262 | * again |
| 263 | */ |
| 264 | if (num_defrag == defrag_batch) { |
| 265 | defrag->last_offset = range.start; |
| 266 | __btrfs_add_inode_defrag(inode, defrag); |
| 267 | /* |
| 268 | * we don't want to kfree defrag, we added it back to |
| 269 | * the rbtree |
| 270 | */ |
| 271 | defrag = NULL; |
| 272 | } else if (defrag->last_offset && !defrag->cycled) { |
| 273 | /* |
| 274 | * we didn't fill our defrag batch, but |
| 275 | * we didn't start at zero. Make sure we loop |
| 276 | * around to the start of the file. |
| 277 | */ |
| 278 | defrag->last_offset = 0; |
| 279 | defrag->cycled = 1; |
| 280 | __btrfs_add_inode_defrag(inode, defrag); |
| 281 | defrag = NULL; |
| 282 | } |
| 283 | |
| 284 | iput(inode); |
| 285 | next: |
| 286 | spin_lock(&fs_info->defrag_inodes_lock); |
| 287 | next_free: |
| 288 | kfree(defrag); |
| 289 | } |
| 290 | spin_unlock(&fs_info->defrag_inodes_lock); |
| 291 | |
| 292 | atomic_dec(&fs_info->defrag_running); |
| 293 | |
| 294 | /* |
| 295 | * during unmount, we use the transaction_wait queue to |
| 296 | * wait for the defragger to stop |
| 297 | */ |
| 298 | wake_up(&fs_info->transaction_wait); |
| 299 | return 0; |
| 300 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 301 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 302 | /* simple helper to fault in pages and copy. This should go away |
| 303 | * and be replaced with calls into generic code. |
| 304 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 305 | static noinline int btrfs_copy_from_user(loff_t pos, int num_pages, |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 306 | size_t write_bytes, |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 307 | struct page **prepared_pages, |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 308 | struct iov_iter *i) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 309 | { |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 310 | size_t copied = 0; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 311 | size_t total_copied = 0; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 312 | int pg = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 313 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 314 | |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 315 | while (write_bytes > 0) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 316 | size_t count = min_t(size_t, |
| 317 | PAGE_CACHE_SIZE - offset, write_bytes); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 318 | struct page *page = prepared_pages[pg]; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 319 | /* |
| 320 | * Copy data from userspace to the current page |
| 321 | * |
| 322 | * Disable pagefault to avoid recursive lock since |
| 323 | * the pages are already locked |
| 324 | */ |
| 325 | pagefault_disable(); |
| 326 | copied = iov_iter_copy_from_user_atomic(page, i, offset, count); |
| 327 | pagefault_enable(); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 328 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 329 | /* Flush processor's dcache for this page */ |
| 330 | flush_dcache_page(page); |
Chris Mason | 31339ac | 2011-03-07 11:10:24 -0500 | [diff] [blame] | 331 | |
| 332 | /* |
| 333 | * if we get a partial write, we can end up with |
| 334 | * partially up to date pages. These add |
| 335 | * a lot of complexity, so make sure they don't |
| 336 | * happen by forcing this copy to be retried. |
| 337 | * |
| 338 | * The rest of the btrfs_file_write code will fall |
| 339 | * back to page at a time copies after we return 0. |
| 340 | */ |
| 341 | if (!PageUptodate(page) && copied < count) |
| 342 | copied = 0; |
| 343 | |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 344 | iov_iter_advance(i, copied); |
| 345 | write_bytes -= copied; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 346 | total_copied += copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 347 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 348 | /* Return to btrfs_file_aio_write to fault page */ |
Josef Bacik | 9f570b8 | 2011-01-25 12:42:37 -0500 | [diff] [blame] | 349 | if (unlikely(copied == 0)) |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 350 | break; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 351 | |
| 352 | if (unlikely(copied < PAGE_CACHE_SIZE - offset)) { |
| 353 | offset += copied; |
| 354 | } else { |
| 355 | pg++; |
| 356 | offset = 0; |
| 357 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 358 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 359 | return total_copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 360 | } |
| 361 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 362 | /* |
| 363 | * unlocks pages after btrfs_file_write is done with them |
| 364 | */ |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 365 | void btrfs_drop_pages(struct page **pages, size_t num_pages) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 366 | { |
| 367 | size_t i; |
| 368 | for (i = 0; i < num_pages; i++) { |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 369 | /* page checked is some magic around finding pages that |
| 370 | * have been modified without going through btrfs_set_page_dirty |
| 371 | * clear it here |
| 372 | */ |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 373 | ClearPageChecked(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 374 | unlock_page(pages[i]); |
| 375 | mark_page_accessed(pages[i]); |
| 376 | page_cache_release(pages[i]); |
| 377 | } |
| 378 | } |
| 379 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 380 | /* |
| 381 | * after copy_from_user, pages need to be dirtied and we need to make |
| 382 | * sure holes are created between the current EOF and the start of |
| 383 | * any next extents (if required). |
| 384 | * |
| 385 | * this also makes the decision about creating an inline extent vs |
| 386 | * doing real data extents, marking pages dirty and delalloc as required. |
| 387 | */ |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 388 | int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, |
| 389 | struct page **pages, size_t num_pages, |
| 390 | loff_t pos, size_t write_bytes, |
| 391 | struct extent_state **cached) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 392 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 393 | int err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 394 | int i; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 395 | u64 num_bytes; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 396 | u64 start_pos; |
| 397 | u64 end_of_last_block; |
| 398 | u64 end_pos = pos + write_bytes; |
| 399 | loff_t isize = i_size_read(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 400 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 401 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 402 | num_bytes = (write_bytes + pos - start_pos + |
| 403 | root->sectorsize - 1) & ~((u64)root->sectorsize - 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 404 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 405 | end_of_last_block = start_pos + num_bytes - 1; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 406 | err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block, |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 407 | cached); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 408 | if (err) |
| 409 | return err; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 410 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 411 | for (i = 0; i < num_pages; i++) { |
| 412 | struct page *p = pages[i]; |
| 413 | SetPageUptodate(p); |
| 414 | ClearPageChecked(p); |
| 415 | set_page_dirty(p); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 416 | } |
Josef Bacik | 9f570b8 | 2011-01-25 12:42:37 -0500 | [diff] [blame] | 417 | |
| 418 | /* |
| 419 | * we've only changed i_size in ram, and we haven't updated |
| 420 | * the disk i_size. There is no need to log the inode |
| 421 | * at this time. |
| 422 | */ |
| 423 | if (end_pos > isize) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 424 | i_size_write(inode, end_pos); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 425 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 426 | } |
| 427 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 428 | /* |
| 429 | * this drops all the extents in the cache that intersect the range |
| 430 | * [start, end]. Existing extents are split as required. |
| 431 | */ |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 432 | int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, |
| 433 | int skip_pinned) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 434 | { |
| 435 | struct extent_map *em; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 436 | struct extent_map *split = NULL; |
| 437 | struct extent_map *split2 = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 438 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 439 | u64 len = end - start + 1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 440 | int ret; |
| 441 | int testend = 1; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 442 | unsigned long flags; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 443 | int compressed = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 444 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 445 | WARN_ON(end < start); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 446 | if (end == (u64)-1) { |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 447 | len = (u64)-1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 448 | testend = 0; |
| 449 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 450 | while (1) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 451 | if (!split) |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 452 | split = alloc_extent_map(); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 453 | if (!split2) |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 454 | split2 = alloc_extent_map(); |
Tsutomu Itoh | c26a920 | 2011-02-14 00:45:29 +0000 | [diff] [blame] | 455 | BUG_ON(!split || !split2); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 456 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 457 | write_lock(&em_tree->lock); |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 458 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 459 | if (!em) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 460 | write_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 461 | break; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 462 | } |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 463 | flags = em->flags; |
| 464 | if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 465 | if (testend && em->start + em->len >= start + len) { |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 466 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 467 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 468 | break; |
| 469 | } |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 470 | start = em->start + em->len; |
| 471 | if (testend) |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 472 | len = start + len - (em->start + em->len); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 473 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 474 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 475 | continue; |
| 476 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 477 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Chris Mason | 3ce7e67 | 2008-07-31 15:42:54 -0400 | [diff] [blame] | 478 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 479 | remove_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 480 | |
| 481 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 482 | em->start < start) { |
| 483 | split->start = em->start; |
| 484 | split->len = start - em->start; |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 485 | split->orig_start = em->orig_start; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 486 | split->block_start = em->block_start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 487 | |
| 488 | if (compressed) |
| 489 | split->block_len = em->block_len; |
| 490 | else |
| 491 | split->block_len = split->len; |
| 492 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 493 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 494 | split->flags = flags; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 495 | split->compress_type = em->compress_type; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 496 | ret = add_extent_mapping(em_tree, split); |
| 497 | BUG_ON(ret); |
| 498 | free_extent_map(split); |
| 499 | split = split2; |
| 500 | split2 = NULL; |
| 501 | } |
| 502 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 503 | testend && em->start + em->len > start + len) { |
| 504 | u64 diff = start + len - em->start; |
| 505 | |
| 506 | split->start = start + len; |
| 507 | split->len = em->start + em->len - (start + len); |
| 508 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 509 | split->flags = flags; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 510 | split->compress_type = em->compress_type; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 511 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 512 | if (compressed) { |
| 513 | split->block_len = em->block_len; |
| 514 | split->block_start = em->block_start; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 515 | split->orig_start = em->orig_start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 516 | } else { |
| 517 | split->block_len = split->len; |
| 518 | split->block_start = em->block_start + diff; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 519 | split->orig_start = split->start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 520 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 521 | |
| 522 | ret = add_extent_mapping(em_tree, split); |
| 523 | BUG_ON(ret); |
| 524 | free_extent_map(split); |
| 525 | split = NULL; |
| 526 | } |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 527 | write_unlock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 528 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 529 | /* once for us */ |
| 530 | free_extent_map(em); |
| 531 | /* once for the tree*/ |
| 532 | free_extent_map(em); |
| 533 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 534 | if (split) |
| 535 | free_extent_map(split); |
| 536 | if (split2) |
| 537 | free_extent_map(split2); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 538 | return 0; |
| 539 | } |
| 540 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 541 | /* |
| 542 | * this is very complex, but the basic idea is to drop all extents |
| 543 | * in the range start - end. hint_block is filled in with a block number |
| 544 | * that would be a good hint to the block allocator for this file. |
| 545 | * |
| 546 | * If an extent intersects the range but is not entirely inside the range |
| 547 | * it is either truncated or split. Anything entirely inside the range |
| 548 | * is deleted from the tree. |
| 549 | */ |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 550 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode, |
| 551 | u64 start, u64 end, u64 *hint_byte, int drop_cache) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 552 | { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 553 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 554 | struct extent_buffer *leaf; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 555 | struct btrfs_file_extent_item *fi; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 556 | struct btrfs_path *path; |
| 557 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 558 | struct btrfs_key new_key; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 559 | u64 ino = btrfs_ino(inode); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 560 | u64 search_start = start; |
| 561 | u64 disk_bytenr = 0; |
| 562 | u64 num_bytes = 0; |
| 563 | u64 extent_offset = 0; |
| 564 | u64 extent_end = 0; |
| 565 | int del_nr = 0; |
| 566 | int del_slot = 0; |
| 567 | int extent_type; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 568 | int recow; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 569 | int ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 570 | |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 571 | if (drop_cache) |
| 572 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 573 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 574 | path = btrfs_alloc_path(); |
| 575 | if (!path) |
| 576 | return -ENOMEM; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 577 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 578 | while (1) { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 579 | recow = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 580 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 581 | search_start, -1); |
| 582 | if (ret < 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 583 | break; |
| 584 | if (ret > 0 && path->slots[0] > 0 && search_start == start) { |
| 585 | leaf = path->nodes[0]; |
| 586 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 587 | if (key.objectid == ino && |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 588 | key.type == BTRFS_EXTENT_DATA_KEY) |
| 589 | path->slots[0]--; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 590 | } |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 591 | ret = 0; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 592 | next_slot: |
| 593 | leaf = path->nodes[0]; |
| 594 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 595 | BUG_ON(del_nr > 0); |
| 596 | ret = btrfs_next_leaf(root, path); |
| 597 | if (ret < 0) |
| 598 | break; |
| 599 | if (ret > 0) { |
| 600 | ret = 0; |
| 601 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 602 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 603 | leaf = path->nodes[0]; |
| 604 | recow = 1; |
| 605 | } |
| 606 | |
| 607 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 608 | if (key.objectid > ino || |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 609 | key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end) |
| 610 | break; |
| 611 | |
| 612 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 613 | struct btrfs_file_extent_item); |
| 614 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 615 | |
| 616 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
| 617 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 618 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 619 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 620 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
| 621 | extent_end = key.offset + |
| 622 | btrfs_file_extent_num_bytes(leaf, fi); |
| 623 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 624 | extent_end = key.offset + |
| 625 | btrfs_file_extent_inline_len(leaf, fi); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 626 | } else { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 627 | WARN_ON(1); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 628 | extent_end = search_start; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 629 | } |
| 630 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 631 | if (extent_end <= search_start) { |
| 632 | path->slots[0]++; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 633 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 634 | } |
| 635 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 636 | search_start = max(key.offset, start); |
| 637 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 638 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 639 | continue; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 640 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 641 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 642 | /* |
| 643 | * | - range to drop - | |
| 644 | * | -------- extent -------- | |
| 645 | */ |
| 646 | if (start > key.offset && end < extent_end) { |
| 647 | BUG_ON(del_nr > 0); |
| 648 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 649 | |
| 650 | memcpy(&new_key, &key, sizeof(new_key)); |
| 651 | new_key.offset = start; |
| 652 | ret = btrfs_duplicate_item(trans, root, path, |
| 653 | &new_key); |
| 654 | if (ret == -EAGAIN) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 655 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 656 | continue; |
| 657 | } |
| 658 | if (ret < 0) |
| 659 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 660 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 661 | leaf = path->nodes[0]; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 662 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
| 663 | struct btrfs_file_extent_item); |
| 664 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 665 | start - key.offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 666 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 667 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 668 | struct btrfs_file_extent_item); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 669 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 670 | extent_offset += start - key.offset; |
| 671 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 672 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 673 | extent_end - start); |
| 674 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 675 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 676 | if (disk_bytenr > 0) { |
| 677 | ret = btrfs_inc_extent_ref(trans, root, |
| 678 | disk_bytenr, num_bytes, 0, |
| 679 | root->root_key.objectid, |
| 680 | new_key.objectid, |
| 681 | start - extent_offset); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 682 | BUG_ON(ret); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 683 | *hint_byte = disk_bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 684 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 685 | key.offset = start; |
| 686 | } |
| 687 | /* |
| 688 | * | ---- range to drop ----- | |
| 689 | * | -------- extent -------- | |
| 690 | */ |
| 691 | if (start <= key.offset && end < extent_end) { |
| 692 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 693 | |
| 694 | memcpy(&new_key, &key, sizeof(new_key)); |
| 695 | new_key.offset = end; |
| 696 | btrfs_set_item_key_safe(trans, root, path, &new_key); |
| 697 | |
| 698 | extent_offset += end - key.offset; |
| 699 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 700 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 701 | extent_end - end); |
| 702 | btrfs_mark_buffer_dirty(leaf); |
| 703 | if (disk_bytenr > 0) { |
| 704 | inode_sub_bytes(inode, end - key.offset); |
| 705 | *hint_byte = disk_bytenr; |
| 706 | } |
| 707 | break; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 708 | } |
| 709 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 710 | search_start = extent_end; |
| 711 | /* |
| 712 | * | ---- range to drop ----- | |
| 713 | * | -------- extent -------- | |
| 714 | */ |
| 715 | if (start > key.offset && end >= extent_end) { |
| 716 | BUG_ON(del_nr > 0); |
| 717 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 718 | |
| 719 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 720 | start - key.offset); |
| 721 | btrfs_mark_buffer_dirty(leaf); |
| 722 | if (disk_bytenr > 0) { |
| 723 | inode_sub_bytes(inode, extent_end - start); |
| 724 | *hint_byte = disk_bytenr; |
| 725 | } |
| 726 | if (end == extent_end) |
| 727 | break; |
| 728 | |
| 729 | path->slots[0]++; |
| 730 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 731 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 732 | |
| 733 | /* |
| 734 | * | ---- range to drop ----- | |
| 735 | * | ------ extent ------ | |
| 736 | */ |
| 737 | if (start <= key.offset && end >= extent_end) { |
| 738 | if (del_nr == 0) { |
| 739 | del_slot = path->slots[0]; |
| 740 | del_nr = 1; |
| 741 | } else { |
| 742 | BUG_ON(del_slot + del_nr != path->slots[0]); |
| 743 | del_nr++; |
| 744 | } |
| 745 | |
| 746 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 747 | inode_sub_bytes(inode, |
| 748 | extent_end - key.offset); |
| 749 | extent_end = ALIGN(extent_end, |
| 750 | root->sectorsize); |
| 751 | } else if (disk_bytenr > 0) { |
| 752 | ret = btrfs_free_extent(trans, root, |
| 753 | disk_bytenr, num_bytes, 0, |
| 754 | root->root_key.objectid, |
| 755 | key.objectid, key.offset - |
| 756 | extent_offset); |
| 757 | BUG_ON(ret); |
| 758 | inode_sub_bytes(inode, |
| 759 | extent_end - key.offset); |
| 760 | *hint_byte = disk_bytenr; |
| 761 | } |
| 762 | |
| 763 | if (end == extent_end) |
| 764 | break; |
| 765 | |
| 766 | if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) { |
| 767 | path->slots[0]++; |
| 768 | goto next_slot; |
| 769 | } |
| 770 | |
| 771 | ret = btrfs_del_items(trans, root, path, del_slot, |
| 772 | del_nr); |
| 773 | BUG_ON(ret); |
| 774 | |
| 775 | del_nr = 0; |
| 776 | del_slot = 0; |
| 777 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 778 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 779 | continue; |
| 780 | } |
| 781 | |
| 782 | BUG_ON(1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 783 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 784 | |
| 785 | if (del_nr > 0) { |
| 786 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
| 787 | BUG_ON(ret); |
| 788 | } |
| 789 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 790 | btrfs_free_path(path); |
| 791 | return ret; |
| 792 | } |
| 793 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 794 | static int extent_mergeable(struct extent_buffer *leaf, int slot, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 795 | u64 objectid, u64 bytenr, u64 orig_offset, |
| 796 | u64 *start, u64 *end) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 797 | { |
| 798 | struct btrfs_file_extent_item *fi; |
| 799 | struct btrfs_key key; |
| 800 | u64 extent_end; |
| 801 | |
| 802 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) |
| 803 | return 0; |
| 804 | |
| 805 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 806 | if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) |
| 807 | return 0; |
| 808 | |
| 809 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 810 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG || |
| 811 | btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr || |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 812 | btrfs_file_extent_offset(leaf, fi) != key.offset - orig_offset || |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 813 | btrfs_file_extent_compression(leaf, fi) || |
| 814 | btrfs_file_extent_encryption(leaf, fi) || |
| 815 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 816 | return 0; |
| 817 | |
| 818 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 819 | if ((*start && *start != key.offset) || (*end && *end != extent_end)) |
| 820 | return 0; |
| 821 | |
| 822 | *start = key.offset; |
| 823 | *end = extent_end; |
| 824 | return 1; |
| 825 | } |
| 826 | |
| 827 | /* |
| 828 | * Mark extent in the range start - end as written. |
| 829 | * |
| 830 | * This changes extent type from 'pre-allocated' to 'regular'. If only |
| 831 | * part of extent is marked as written, the extent will be split into |
| 832 | * two or three. |
| 833 | */ |
| 834 | int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 835 | struct inode *inode, u64 start, u64 end) |
| 836 | { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 837 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 838 | struct extent_buffer *leaf; |
| 839 | struct btrfs_path *path; |
| 840 | struct btrfs_file_extent_item *fi; |
| 841 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 842 | struct btrfs_key new_key; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 843 | u64 bytenr; |
| 844 | u64 num_bytes; |
| 845 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 846 | u64 orig_offset; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 847 | u64 other_start; |
| 848 | u64 other_end; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 849 | u64 split; |
| 850 | int del_nr = 0; |
| 851 | int del_slot = 0; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 852 | int recow; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 853 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 854 | u64 ino = btrfs_ino(inode); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 855 | |
| 856 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
| 857 | |
| 858 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 859 | if (!path) |
| 860 | return -ENOMEM; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 861 | again: |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 862 | recow = 0; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 863 | split = start; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 864 | key.objectid = ino; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 865 | key.type = BTRFS_EXTENT_DATA_KEY; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 866 | key.offset = split; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 867 | |
| 868 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Josef Bacik | 4141573 | 2011-03-16 13:59:32 -0400 | [diff] [blame] | 869 | if (ret < 0) |
| 870 | goto out; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 871 | if (ret > 0 && path->slots[0] > 0) |
| 872 | path->slots[0]--; |
| 873 | |
| 874 | leaf = path->nodes[0]; |
| 875 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 876 | BUG_ON(key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 877 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 878 | struct btrfs_file_extent_item); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 879 | BUG_ON(btrfs_file_extent_type(leaf, fi) != |
| 880 | BTRFS_FILE_EXTENT_PREALLOC); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 881 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 882 | BUG_ON(key.offset > start || extent_end < end); |
| 883 | |
| 884 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 885 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 886 | orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 887 | memcpy(&new_key, &key, sizeof(new_key)); |
| 888 | |
| 889 | if (start == key.offset && end < extent_end) { |
| 890 | other_start = 0; |
| 891 | other_end = start; |
| 892 | if (extent_mergeable(leaf, path->slots[0] - 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 893 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 894 | &other_start, &other_end)) { |
| 895 | new_key.offset = end; |
| 896 | btrfs_set_item_key_safe(trans, root, path, &new_key); |
| 897 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 898 | struct btrfs_file_extent_item); |
| 899 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 900 | extent_end - end); |
| 901 | btrfs_set_file_extent_offset(leaf, fi, |
| 902 | end - orig_offset); |
| 903 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
| 904 | struct btrfs_file_extent_item); |
| 905 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 906 | end - other_start); |
| 907 | btrfs_mark_buffer_dirty(leaf); |
| 908 | goto out; |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | if (start > key.offset && end == extent_end) { |
| 913 | other_start = end; |
| 914 | other_end = 0; |
| 915 | if (extent_mergeable(leaf, path->slots[0] + 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 916 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 917 | &other_start, &other_end)) { |
| 918 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 919 | struct btrfs_file_extent_item); |
| 920 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 921 | start - key.offset); |
| 922 | path->slots[0]++; |
| 923 | new_key.offset = start; |
| 924 | btrfs_set_item_key_safe(trans, root, path, &new_key); |
| 925 | |
| 926 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 927 | struct btrfs_file_extent_item); |
| 928 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 929 | other_end - start); |
| 930 | btrfs_set_file_extent_offset(leaf, fi, |
| 931 | start - orig_offset); |
| 932 | btrfs_mark_buffer_dirty(leaf); |
| 933 | goto out; |
| 934 | } |
| 935 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 936 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 937 | while (start > key.offset || end < extent_end) { |
| 938 | if (key.offset == start) |
| 939 | split = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 940 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 941 | new_key.offset = split; |
| 942 | ret = btrfs_duplicate_item(trans, root, path, &new_key); |
| 943 | if (ret == -EAGAIN) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 944 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 945 | goto again; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 946 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 947 | BUG_ON(ret < 0); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 948 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 949 | leaf = path->nodes[0]; |
| 950 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 951 | struct btrfs_file_extent_item); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 952 | btrfs_set_file_extent_num_bytes(leaf, fi, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 953 | split - key.offset); |
| 954 | |
| 955 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 956 | struct btrfs_file_extent_item); |
| 957 | |
| 958 | btrfs_set_file_extent_offset(leaf, fi, split - orig_offset); |
| 959 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 960 | extent_end - split); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 961 | btrfs_mark_buffer_dirty(leaf); |
| 962 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 963 | ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, |
| 964 | root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 965 | ino, orig_offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 966 | BUG_ON(ret); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 967 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 968 | if (split == start) { |
| 969 | key.offset = start; |
| 970 | } else { |
| 971 | BUG_ON(start != key.offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 972 | path->slots[0]--; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 973 | extent_end = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 974 | } |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 975 | recow = 1; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 976 | } |
| 977 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 978 | other_start = end; |
| 979 | other_end = 0; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 980 | if (extent_mergeable(leaf, path->slots[0] + 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 981 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 982 | &other_start, &other_end)) { |
| 983 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 984 | btrfs_release_path(path); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 985 | goto again; |
| 986 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 987 | extent_end = other_end; |
| 988 | del_slot = path->slots[0] + 1; |
| 989 | del_nr++; |
| 990 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 991 | 0, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 992 | ino, orig_offset); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 993 | BUG_ON(ret); |
| 994 | } |
| 995 | other_start = 0; |
| 996 | other_end = start; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 997 | if (extent_mergeable(leaf, path->slots[0] - 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 998 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 999 | &other_start, &other_end)) { |
| 1000 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1001 | btrfs_release_path(path); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1002 | goto again; |
| 1003 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1004 | key.offset = other_start; |
| 1005 | del_slot = path->slots[0]; |
| 1006 | del_nr++; |
| 1007 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 1008 | 0, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1009 | ino, orig_offset); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1010 | BUG_ON(ret); |
| 1011 | } |
| 1012 | if (del_nr == 0) { |
Shaohua Li | 3f6fae9 | 2010-02-11 07:43:00 +0000 | [diff] [blame] | 1013 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1014 | struct btrfs_file_extent_item); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1015 | btrfs_set_file_extent_type(leaf, fi, |
| 1016 | BTRFS_FILE_EXTENT_REG); |
| 1017 | btrfs_mark_buffer_dirty(leaf); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1018 | } else { |
Shaohua Li | 3f6fae9 | 2010-02-11 07:43:00 +0000 | [diff] [blame] | 1019 | fi = btrfs_item_ptr(leaf, del_slot - 1, |
| 1020 | struct btrfs_file_extent_item); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1021 | btrfs_set_file_extent_type(leaf, fi, |
| 1022 | BTRFS_FILE_EXTENT_REG); |
| 1023 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1024 | extent_end - key.offset); |
| 1025 | btrfs_mark_buffer_dirty(leaf); |
| 1026 | |
| 1027 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
| 1028 | BUG_ON(ret); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1029 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1030 | out: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1031 | btrfs_free_path(path); |
| 1032 | return 0; |
| 1033 | } |
| 1034 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1035 | /* |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1036 | * on error we return an unlocked page and the error value |
| 1037 | * on success we return a locked page and 0 |
| 1038 | */ |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1039 | static int prepare_uptodate_page(struct page *page, u64 pos, |
| 1040 | bool force_uptodate) |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1041 | { |
| 1042 | int ret = 0; |
| 1043 | |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1044 | if (((pos & (PAGE_CACHE_SIZE - 1)) || force_uptodate) && |
| 1045 | !PageUptodate(page)) { |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1046 | ret = btrfs_readpage(NULL, page); |
| 1047 | if (ret) |
| 1048 | return ret; |
| 1049 | lock_page(page); |
| 1050 | if (!PageUptodate(page)) { |
| 1051 | unlock_page(page); |
| 1052 | return -EIO; |
| 1053 | } |
| 1054 | } |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1059 | * this gets pages into the page cache and locks them down, it also properly |
| 1060 | * waits for data=ordered extents to finish before allowing the pages to be |
| 1061 | * modified. |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1062 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1063 | static noinline int prepare_pages(struct btrfs_root *root, struct file *file, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 1064 | struct page **pages, size_t num_pages, |
| 1065 | loff_t pos, unsigned long first_index, |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1066 | size_t write_bytes, bool force_uptodate) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1067 | { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1068 | struct extent_state *cached_state = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1069 | int i; |
| 1070 | unsigned long index = pos >> PAGE_CACHE_SHIFT; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1071 | struct inode *inode = fdentry(file)->d_inode; |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 1072 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1073 | int err = 0; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1074 | int faili = 0; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1075 | u64 start_pos; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1076 | u64 last_pos; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1077 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1078 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1079 | last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1080 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1081 | again: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1082 | for (i = 0; i < num_pages; i++) { |
Josef Bacik | a94733d | 2011-07-11 10:47:06 -0400 | [diff] [blame] | 1083 | pages[i] = find_or_create_page(inode->i_mapping, index + i, |
Johannes Weiner | e3a41a5 | 2012-01-10 15:07:55 -0800 | [diff] [blame] | 1084 | mask | __GFP_WRITE); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1085 | if (!pages[i]) { |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1086 | faili = i - 1; |
| 1087 | err = -ENOMEM; |
| 1088 | goto fail; |
| 1089 | } |
| 1090 | |
| 1091 | if (i == 0) |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1092 | err = prepare_uptodate_page(pages[i], pos, |
| 1093 | force_uptodate); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1094 | if (i == num_pages - 1) |
| 1095 | err = prepare_uptodate_page(pages[i], |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1096 | pos + write_bytes, false); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1097 | if (err) { |
| 1098 | page_cache_release(pages[i]); |
| 1099 | faili = i - 1; |
| 1100 | goto fail; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1101 | } |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1102 | wait_on_page_writeback(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1103 | } |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1104 | err = 0; |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 1105 | if (start_pos < inode->i_size) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1106 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1107 | lock_extent_bits(&BTRFS_I(inode)->io_tree, |
| 1108 | start_pos, last_pos - 1, 0, &cached_state, |
| 1109 | GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1110 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 1111 | last_pos - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1112 | if (ordered && |
| 1113 | ordered->file_offset + ordered->len > start_pos && |
| 1114 | ordered->file_offset < last_pos) { |
| 1115 | btrfs_put_ordered_extent(ordered); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1116 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 1117 | start_pos, last_pos - 1, |
| 1118 | &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1119 | for (i = 0; i < num_pages; i++) { |
| 1120 | unlock_page(pages[i]); |
| 1121 | page_cache_release(pages[i]); |
| 1122 | } |
| 1123 | btrfs_wait_ordered_range(inode, start_pos, |
| 1124 | last_pos - start_pos); |
| 1125 | goto again; |
| 1126 | } |
| 1127 | if (ordered) |
| 1128 | btrfs_put_ordered_extent(ordered); |
| 1129 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1130 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos, |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 1131 | last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1132 | EXTENT_DO_ACCOUNTING, 0, 0, &cached_state, |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 1133 | GFP_NOFS); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1134 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 1135 | start_pos, last_pos - 1, &cached_state, |
| 1136 | GFP_NOFS); |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 1137 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1138 | for (i = 0; i < num_pages; i++) { |
Wu Fengguang | 32c7f20 | 2011-08-08 15:19:47 -0600 | [diff] [blame] | 1139 | if (clear_page_dirty_for_io(pages[i])) |
| 1140 | account_page_redirty(pages[i]); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1141 | set_page_extent_mapped(pages[i]); |
| 1142 | WARN_ON(!PageLocked(pages[i])); |
| 1143 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1144 | return 0; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1145 | fail: |
| 1146 | while (faili >= 0) { |
| 1147 | unlock_page(pages[faili]); |
| 1148 | page_cache_release(pages[faili]); |
| 1149 | faili--; |
| 1150 | } |
| 1151 | return err; |
| 1152 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1153 | } |
| 1154 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1155 | static noinline ssize_t __btrfs_buffered_write(struct file *file, |
| 1156 | struct iov_iter *i, |
| 1157 | loff_t pos) |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 1158 | { |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1159 | struct inode *inode = fdentry(file)->d_inode; |
| 1160 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1161 | struct page **pages = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1162 | unsigned long first_index; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1163 | size_t num_written = 0; |
| 1164 | int nrptrs; |
Tsutomu Itoh | c914923 | 2011-03-30 00:57:23 +0000 | [diff] [blame] | 1165 | int ret = 0; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1166 | bool force_page_uptodate = false; |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1167 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1168 | nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) / |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1169 | PAGE_CACHE_SIZE, PAGE_CACHE_SIZE / |
| 1170 | (sizeof(struct page *))); |
Wu Fengguang | 142349f | 2011-12-16 12:32:57 -0500 | [diff] [blame] | 1171 | nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied); |
| 1172 | nrptrs = max(nrptrs, 8); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1173 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1174 | if (!pages) |
| 1175 | return -ENOMEM; |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 1176 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1177 | first_index = pos >> PAGE_CACHE_SHIFT; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1178 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1179 | while (iov_iter_count(i) > 0) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1180 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1181 | size_t write_bytes = min(iov_iter_count(i), |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1182 | nrptrs * (size_t)PAGE_CACHE_SIZE - |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1183 | offset); |
Yan, Zheng | 3a90983 | 2011-01-18 13:34:40 +0800 | [diff] [blame] | 1184 | size_t num_pages = (write_bytes + offset + |
| 1185 | PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1186 | size_t dirty_pages; |
| 1187 | size_t copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1188 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1189 | WARN_ON(num_pages > nrptrs); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1190 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1191 | /* |
| 1192 | * Fault pages before locking them in prepare_pages |
| 1193 | * to avoid recursive lock |
| 1194 | */ |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1195 | if (unlikely(iov_iter_fault_in_readable(i, write_bytes))) { |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1196 | ret = -EFAULT; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1197 | break; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | ret = btrfs_delalloc_reserve_space(inode, |
| 1201 | num_pages << PAGE_CACHE_SHIFT); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1202 | if (ret) |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1203 | break; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1204 | |
Josef Bacik | 4a64001 | 2011-01-25 15:10:08 -0500 | [diff] [blame] | 1205 | /* |
| 1206 | * This is going to setup the pages array with the number of |
| 1207 | * pages we want, so we don't really need to worry about the |
| 1208 | * contents of pages from loop to loop |
| 1209 | */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1210 | ret = prepare_pages(root, file, pages, num_pages, |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1211 | pos, first_index, write_bytes, |
| 1212 | force_page_uptodate); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1213 | if (ret) { |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1214 | btrfs_delalloc_release_space(inode, |
| 1215 | num_pages << PAGE_CACHE_SHIFT); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1216 | break; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1217 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1218 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1219 | copied = btrfs_copy_from_user(pos, num_pages, |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1220 | write_bytes, pages, i); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1221 | |
| 1222 | /* |
| 1223 | * if we have trouble faulting in the pages, fall |
| 1224 | * back to one page at a time |
| 1225 | */ |
| 1226 | if (copied < write_bytes) |
| 1227 | nrptrs = 1; |
| 1228 | |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1229 | if (copied == 0) { |
| 1230 | force_page_uptodate = true; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1231 | dirty_pages = 0; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1232 | } else { |
| 1233 | force_page_uptodate = false; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1234 | dirty_pages = (copied + offset + |
| 1235 | PAGE_CACHE_SIZE - 1) >> |
| 1236 | PAGE_CACHE_SHIFT; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1237 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1238 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1239 | /* |
| 1240 | * If we had a short copy we need to release the excess delaloc |
| 1241 | * bytes we reserved. We need to increment outstanding_extents |
| 1242 | * because btrfs_delalloc_release_space will decrement it, but |
| 1243 | * we still have an outstanding extent for the chunk we actually |
| 1244 | * managed to copy. |
| 1245 | */ |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1246 | if (num_pages > dirty_pages) { |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1247 | if (copied > 0) { |
| 1248 | spin_lock(&BTRFS_I(inode)->lock); |
| 1249 | BTRFS_I(inode)->outstanding_extents++; |
| 1250 | spin_unlock(&BTRFS_I(inode)->lock); |
| 1251 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1252 | btrfs_delalloc_release_space(inode, |
| 1253 | (num_pages - dirty_pages) << |
| 1254 | PAGE_CACHE_SHIFT); |
| 1255 | } |
| 1256 | |
| 1257 | if (copied > 0) { |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1258 | ret = btrfs_dirty_pages(root, inode, pages, |
| 1259 | dirty_pages, pos, copied, |
| 1260 | NULL); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1261 | if (ret) { |
| 1262 | btrfs_delalloc_release_space(inode, |
| 1263 | dirty_pages << PAGE_CACHE_SHIFT); |
| 1264 | btrfs_drop_pages(pages, num_pages); |
| 1265 | break; |
| 1266 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1267 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1268 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1269 | btrfs_drop_pages(pages, num_pages); |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1270 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1271 | cond_resched(); |
| 1272 | |
| 1273 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, |
| 1274 | dirty_pages); |
| 1275 | if (dirty_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
| 1276 | btrfs_btree_balance_dirty(root, 1); |
| 1277 | btrfs_throttle(root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1278 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1279 | pos += copied; |
| 1280 | num_written += copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1281 | } |
Chris Mason | 5b92ee7 | 2008-01-03 13:46:11 -0500 | [diff] [blame] | 1282 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1283 | kfree(pages); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1284 | |
| 1285 | return num_written ? num_written : ret; |
| 1286 | } |
| 1287 | |
| 1288 | static ssize_t __btrfs_direct_write(struct kiocb *iocb, |
| 1289 | const struct iovec *iov, |
| 1290 | unsigned long nr_segs, loff_t pos, |
| 1291 | loff_t *ppos, size_t count, size_t ocount) |
| 1292 | { |
| 1293 | struct file *file = iocb->ki_filp; |
| 1294 | struct inode *inode = fdentry(file)->d_inode; |
| 1295 | struct iov_iter i; |
| 1296 | ssize_t written; |
| 1297 | ssize_t written_buffered; |
| 1298 | loff_t endbyte; |
| 1299 | int err; |
| 1300 | |
| 1301 | written = generic_file_direct_write(iocb, iov, &nr_segs, pos, ppos, |
| 1302 | count, ocount); |
| 1303 | |
| 1304 | /* |
| 1305 | * the generic O_DIRECT will update in-memory i_size after the |
| 1306 | * DIOs are done. But our endio handlers that update the on |
| 1307 | * disk i_size never update past the in memory i_size. So we |
| 1308 | * need one more update here to catch any additions to the |
| 1309 | * file |
| 1310 | */ |
| 1311 | if (inode->i_size != BTRFS_I(inode)->disk_i_size) { |
| 1312 | btrfs_ordered_update_i_size(inode, inode->i_size, NULL); |
| 1313 | mark_inode_dirty(inode); |
| 1314 | } |
| 1315 | |
| 1316 | if (written < 0 || written == count) |
| 1317 | return written; |
| 1318 | |
| 1319 | pos += written; |
| 1320 | count -= written; |
| 1321 | iov_iter_init(&i, iov, nr_segs, count, written); |
| 1322 | written_buffered = __btrfs_buffered_write(file, &i, pos); |
| 1323 | if (written_buffered < 0) { |
| 1324 | err = written_buffered; |
| 1325 | goto out; |
| 1326 | } |
| 1327 | endbyte = pos + written_buffered - 1; |
| 1328 | err = filemap_write_and_wait_range(file->f_mapping, pos, endbyte); |
| 1329 | if (err) |
| 1330 | goto out; |
| 1331 | written += written_buffered; |
| 1332 | *ppos = pos + written_buffered; |
| 1333 | invalidate_mapping_pages(file->f_mapping, pos >> PAGE_CACHE_SHIFT, |
| 1334 | endbyte >> PAGE_CACHE_SHIFT); |
| 1335 | out: |
| 1336 | return written ? written : err; |
| 1337 | } |
| 1338 | |
| 1339 | static ssize_t btrfs_file_aio_write(struct kiocb *iocb, |
| 1340 | const struct iovec *iov, |
| 1341 | unsigned long nr_segs, loff_t pos) |
| 1342 | { |
| 1343 | struct file *file = iocb->ki_filp; |
| 1344 | struct inode *inode = fdentry(file)->d_inode; |
| 1345 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1346 | loff_t *ppos = &iocb->ki_pos; |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1347 | u64 start_pos; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1348 | ssize_t num_written = 0; |
| 1349 | ssize_t err = 0; |
| 1350 | size_t count, ocount; |
| 1351 | |
| 1352 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
| 1353 | |
| 1354 | mutex_lock(&inode->i_mutex); |
| 1355 | |
| 1356 | err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ); |
| 1357 | if (err) { |
| 1358 | mutex_unlock(&inode->i_mutex); |
| 1359 | goto out; |
| 1360 | } |
| 1361 | count = ocount; |
| 1362 | |
| 1363 | current->backing_dev_info = inode->i_mapping->backing_dev_info; |
| 1364 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); |
| 1365 | if (err) { |
| 1366 | mutex_unlock(&inode->i_mutex); |
| 1367 | goto out; |
| 1368 | } |
| 1369 | |
| 1370 | if (count == 0) { |
| 1371 | mutex_unlock(&inode->i_mutex); |
| 1372 | goto out; |
| 1373 | } |
| 1374 | |
| 1375 | err = file_remove_suid(file); |
| 1376 | if (err) { |
| 1377 | mutex_unlock(&inode->i_mutex); |
| 1378 | goto out; |
| 1379 | } |
| 1380 | |
| 1381 | /* |
| 1382 | * If BTRFS flips readonly due to some impossible error |
| 1383 | * (fs_info->fs_state now has BTRFS_SUPER_FLAG_ERROR), |
| 1384 | * although we have opened a file as writable, we have |
| 1385 | * to stop this write operation to ensure FS consistency. |
| 1386 | */ |
| 1387 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
| 1388 | mutex_unlock(&inode->i_mutex); |
| 1389 | err = -EROFS; |
| 1390 | goto out; |
| 1391 | } |
| 1392 | |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 1393 | err = btrfs_update_time(file); |
| 1394 | if (err) { |
| 1395 | mutex_unlock(&inode->i_mutex); |
| 1396 | goto out; |
| 1397 | } |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1398 | BTRFS_I(inode)->sequence++; |
| 1399 | |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1400 | start_pos = round_down(pos, root->sectorsize); |
| 1401 | if (start_pos > i_size_read(inode)) { |
| 1402 | err = btrfs_cont_expand(inode, i_size_read(inode), start_pos); |
| 1403 | if (err) { |
| 1404 | mutex_unlock(&inode->i_mutex); |
| 1405 | goto out; |
| 1406 | } |
| 1407 | } |
| 1408 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1409 | if (unlikely(file->f_flags & O_DIRECT)) { |
| 1410 | num_written = __btrfs_direct_write(iocb, iov, nr_segs, |
| 1411 | pos, ppos, count, ocount); |
| 1412 | } else { |
| 1413 | struct iov_iter i; |
| 1414 | |
| 1415 | iov_iter_init(&i, iov, nr_segs, count, num_written); |
| 1416 | |
| 1417 | num_written = __btrfs_buffered_write(file, &i, pos); |
| 1418 | if (num_written > 0) |
| 1419 | *ppos = pos + num_written; |
| 1420 | } |
| 1421 | |
| 1422 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1423 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1424 | /* |
| 1425 | * we want to make sure fsync finds this change |
| 1426 | * but we haven't joined a transaction running right now. |
| 1427 | * |
| 1428 | * Later on, someone is sure to update the inode and get the |
| 1429 | * real transid recorded. |
| 1430 | * |
| 1431 | * We set last_trans now to the fs_info generation + 1, |
| 1432 | * this will either be one more than the running transaction |
| 1433 | * or the generation used for the next transaction if there isn't |
| 1434 | * one running right now. |
| 1435 | */ |
| 1436 | BTRFS_I(inode)->last_trans = root->fs_info->generation + 1; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1437 | if (num_written > 0 || num_written == -EIOCBQUEUED) { |
| 1438 | err = generic_write_sync(file, pos, num_written); |
| 1439 | if (err < 0 && num_written > 0) |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1440 | num_written = err; |
| 1441 | } |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1442 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1443 | current->backing_dev_info = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1444 | return num_written ? num_written : err; |
| 1445 | } |
| 1446 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1447 | int btrfs_release_file(struct inode *inode, struct file *filp) |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1448 | { |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1449 | /* |
| 1450 | * ordered_data_close is set by settattr when we are about to truncate |
| 1451 | * a file from a non-zero size to a zero size. This tries to |
| 1452 | * flush down new bytes that may have been written if the |
| 1453 | * application were using truncate to replace a file in place. |
| 1454 | */ |
| 1455 | if (BTRFS_I(inode)->ordered_data_close) { |
| 1456 | BTRFS_I(inode)->ordered_data_close = 0; |
| 1457 | btrfs_add_ordered_operation(NULL, BTRFS_I(inode)->root, inode); |
| 1458 | if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
| 1459 | filemap_flush(inode->i_mapping); |
| 1460 | } |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1461 | if (filp->private_data) |
| 1462 | btrfs_ioctl_trans_end(filp); |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1463 | return 0; |
| 1464 | } |
| 1465 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1466 | /* |
| 1467 | * fsync call for both files and directories. This logs the inode into |
| 1468 | * the tree log instead of forcing full commits whenever possible. |
| 1469 | * |
| 1470 | * It needs to call filemap_fdatawait so that all ordered extent updates are |
| 1471 | * in the metadata btree are up to date for copying to the log. |
| 1472 | * |
| 1473 | * It drops the inode mutex before doing the tree log commit. This is an |
| 1474 | * important optimization for directories because holding the mutex prevents |
| 1475 | * new operations on the dir while we write to disk. |
| 1476 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1477 | int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1478 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 1479 | struct dentry *dentry = file->f_path.dentry; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1480 | struct inode *inode = dentry->d_inode; |
| 1481 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1482 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1483 | struct btrfs_trans_handle *trans; |
| 1484 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 1485 | trace_btrfs_sync_file(file, datasync); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1486 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1487 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 1488 | if (ret) |
| 1489 | return ret; |
| 1490 | mutex_lock(&inode->i_mutex); |
| 1491 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1492 | /* we wait first, since the writeback may change the inode */ |
| 1493 | root->log_batch++; |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1494 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
| 1495 | root->log_batch++; |
| 1496 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1497 | /* |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1498 | * check the transaction that last modified this inode |
| 1499 | * and see if its already been committed |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1500 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1501 | if (!BTRFS_I(inode)->last_trans) { |
| 1502 | mutex_unlock(&inode->i_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1503 | goto out; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1504 | } |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1505 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1506 | /* |
| 1507 | * if the last transaction that changed this file was before |
| 1508 | * the current transaction, we can bail out now without any |
| 1509 | * syncing |
| 1510 | */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1511 | smp_mb(); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1512 | if (BTRFS_I(inode)->last_trans <= |
| 1513 | root->fs_info->last_trans_committed) { |
| 1514 | BTRFS_I(inode)->last_trans = 0; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1515 | mutex_unlock(&inode->i_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1516 | goto out; |
| 1517 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1518 | |
| 1519 | /* |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1520 | * ok we haven't committed the transaction yet, lets do a commit |
| 1521 | */ |
Dan Carpenter | 6f902af | 2010-05-29 09:49:07 +0000 | [diff] [blame] | 1522 | if (file->private_data) |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1523 | btrfs_ioctl_trans_end(file); |
| 1524 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1525 | trans = btrfs_start_transaction(root, 0); |
| 1526 | if (IS_ERR(trans)) { |
| 1527 | ret = PTR_ERR(trans); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1528 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1529 | goto out; |
| 1530 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1531 | |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1532 | ret = btrfs_log_dentry_safe(trans, root, dentry); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1533 | if (ret < 0) { |
| 1534 | mutex_unlock(&inode->i_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1535 | goto out; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1536 | } |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1537 | |
| 1538 | /* we've logged all the items and now have a consistent |
| 1539 | * version of the file in the log. It is possible that |
| 1540 | * someone will come in and modify the file, but that's |
| 1541 | * fine because the log is consistent on disk, and we |
| 1542 | * have references to all of the file's extents |
| 1543 | * |
| 1544 | * It is possible that someone will come in and log the |
| 1545 | * file again, but that will end up using the synchronization |
| 1546 | * inside btrfs_sync_log to keep things safe. |
| 1547 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1548 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1549 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1550 | if (ret != BTRFS_NO_LOG_SYNC) { |
| 1551 | if (ret > 0) { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1552 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1553 | } else { |
| 1554 | ret = btrfs_sync_log(trans, root); |
| 1555 | if (ret == 0) |
| 1556 | ret = btrfs_end_transaction(trans, root); |
| 1557 | else |
| 1558 | ret = btrfs_commit_transaction(trans, root); |
| 1559 | } |
| 1560 | } else { |
| 1561 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1562 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1563 | out: |
Roel Kluin | 014e4ac | 2010-01-29 10:42:11 +0000 | [diff] [blame] | 1564 | return ret > 0 ? -EIO : ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1565 | } |
| 1566 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1567 | static const struct vm_operations_struct btrfs_file_vm_ops = { |
Chris Mason | 92fee66 | 2007-07-25 12:31:35 -0400 | [diff] [blame] | 1568 | .fault = filemap_fault, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1569 | .page_mkwrite = btrfs_page_mkwrite, |
| 1570 | }; |
| 1571 | |
| 1572 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
| 1573 | { |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 1574 | struct address_space *mapping = filp->f_mapping; |
| 1575 | |
| 1576 | if (!mapping->a_ops->readpage) |
| 1577 | return -ENOEXEC; |
| 1578 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1579 | file_accessed(filp); |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 1580 | vma->vm_ops = &btrfs_file_vm_ops; |
| 1581 | vma->vm_flags |= VM_CAN_NONLINEAR; |
| 1582 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1583 | return 0; |
| 1584 | } |
| 1585 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1586 | static long btrfs_fallocate(struct file *file, int mode, |
| 1587 | loff_t offset, loff_t len) |
| 1588 | { |
| 1589 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1590 | struct extent_state *cached_state = NULL; |
| 1591 | u64 cur_offset; |
| 1592 | u64 last_byte; |
| 1593 | u64 alloc_start; |
| 1594 | u64 alloc_end; |
| 1595 | u64 alloc_hint = 0; |
| 1596 | u64 locked_end; |
| 1597 | u64 mask = BTRFS_I(inode)->root->sectorsize - 1; |
| 1598 | struct extent_map *em; |
| 1599 | int ret; |
| 1600 | |
| 1601 | alloc_start = offset & ~mask; |
| 1602 | alloc_end = (offset + len + mask) & ~mask; |
| 1603 | |
| 1604 | /* We only support the FALLOC_FL_KEEP_SIZE mode */ |
| 1605 | if (mode & ~FALLOC_FL_KEEP_SIZE) |
| 1606 | return -EOPNOTSUPP; |
| 1607 | |
| 1608 | /* |
| 1609 | * wait for ordered IO before we have any locks. We'll loop again |
| 1610 | * below with the locks held. |
| 1611 | */ |
| 1612 | btrfs_wait_ordered_range(inode, alloc_start, alloc_end - alloc_start); |
| 1613 | |
| 1614 | mutex_lock(&inode->i_mutex); |
| 1615 | ret = inode_newsize_ok(inode, alloc_end); |
| 1616 | if (ret) |
| 1617 | goto out; |
| 1618 | |
| 1619 | if (alloc_start > inode->i_size) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 1620 | ret = btrfs_cont_expand(inode, i_size_read(inode), |
| 1621 | alloc_start); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1622 | if (ret) |
| 1623 | goto out; |
| 1624 | } |
| 1625 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1626 | locked_end = alloc_end - 1; |
| 1627 | while (1) { |
| 1628 | struct btrfs_ordered_extent *ordered; |
| 1629 | |
| 1630 | /* the extent lock is ordered inside the running |
| 1631 | * transaction |
| 1632 | */ |
| 1633 | lock_extent_bits(&BTRFS_I(inode)->io_tree, alloc_start, |
| 1634 | locked_end, 0, &cached_state, GFP_NOFS); |
| 1635 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 1636 | alloc_end - 1); |
| 1637 | if (ordered && |
| 1638 | ordered->file_offset + ordered->len > alloc_start && |
| 1639 | ordered->file_offset < alloc_end) { |
| 1640 | btrfs_put_ordered_extent(ordered); |
| 1641 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 1642 | alloc_start, locked_end, |
| 1643 | &cached_state, GFP_NOFS); |
| 1644 | /* |
| 1645 | * we can't wait on the range with the transaction |
| 1646 | * running or with the extent lock held |
| 1647 | */ |
| 1648 | btrfs_wait_ordered_range(inode, alloc_start, |
| 1649 | alloc_end - alloc_start); |
| 1650 | } else { |
| 1651 | if (ordered) |
| 1652 | btrfs_put_ordered_extent(ordered); |
| 1653 | break; |
| 1654 | } |
| 1655 | } |
| 1656 | |
| 1657 | cur_offset = alloc_start; |
| 1658 | while (1) { |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 1659 | u64 actual_end; |
| 1660 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1661 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
| 1662 | alloc_end - cur_offset, 0); |
David Sterba | c704005 | 2011-04-19 18:00:01 +0200 | [diff] [blame] | 1663 | BUG_ON(IS_ERR_OR_NULL(em)); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1664 | last_byte = min(extent_map_end(em), alloc_end); |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 1665 | actual_end = min_t(u64, extent_map_end(em), offset + len); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1666 | last_byte = (last_byte + mask) & ~mask; |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 1667 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1668 | if (em->block_start == EXTENT_MAP_HOLE || |
| 1669 | (cur_offset >= inode->i_size && |
| 1670 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { |
Josef Bacik | 1b9c332 | 2011-08-17 10:19:52 -0400 | [diff] [blame] | 1671 | |
| 1672 | /* |
| 1673 | * Make sure we have enough space before we do the |
| 1674 | * allocation. |
| 1675 | */ |
| 1676 | ret = btrfs_check_data_free_space(inode, last_byte - |
| 1677 | cur_offset); |
| 1678 | if (ret) { |
| 1679 | free_extent_map(em); |
| 1680 | break; |
| 1681 | } |
| 1682 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1683 | ret = btrfs_prealloc_file_range(inode, mode, cur_offset, |
| 1684 | last_byte - cur_offset, |
| 1685 | 1 << inode->i_blkbits, |
| 1686 | offset + len, |
| 1687 | &alloc_hint); |
Josef Bacik | 1b9c332 | 2011-08-17 10:19:52 -0400 | [diff] [blame] | 1688 | |
| 1689 | /* Let go of our reservation. */ |
| 1690 | btrfs_free_reserved_data_space(inode, last_byte - |
| 1691 | cur_offset); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1692 | if (ret < 0) { |
| 1693 | free_extent_map(em); |
| 1694 | break; |
| 1695 | } |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 1696 | } else if (actual_end > inode->i_size && |
| 1697 | !(mode & FALLOC_FL_KEEP_SIZE)) { |
| 1698 | /* |
| 1699 | * We didn't need to allocate any more space, but we |
| 1700 | * still extended the size of the file so we need to |
| 1701 | * update i_size. |
| 1702 | */ |
| 1703 | inode->i_ctime = CURRENT_TIME; |
| 1704 | i_size_write(inode, actual_end); |
| 1705 | btrfs_ordered_update_i_size(inode, actual_end, NULL); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1706 | } |
| 1707 | free_extent_map(em); |
| 1708 | |
| 1709 | cur_offset = last_byte; |
| 1710 | if (cur_offset >= alloc_end) { |
| 1711 | ret = 0; |
| 1712 | break; |
| 1713 | } |
| 1714 | } |
| 1715 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end, |
| 1716 | &cached_state, GFP_NOFS); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1717 | out: |
| 1718 | mutex_unlock(&inode->i_mutex); |
| 1719 | return ret; |
| 1720 | } |
| 1721 | |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 1722 | static int find_desired_extent(struct inode *inode, loff_t *offset, int origin) |
| 1723 | { |
| 1724 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1725 | struct extent_map *em; |
| 1726 | struct extent_state *cached_state = NULL; |
| 1727 | u64 lockstart = *offset; |
| 1728 | u64 lockend = i_size_read(inode); |
| 1729 | u64 start = *offset; |
| 1730 | u64 orig_start = *offset; |
| 1731 | u64 len = i_size_read(inode); |
| 1732 | u64 last_end = 0; |
| 1733 | int ret = 0; |
| 1734 | |
| 1735 | lockend = max_t(u64, root->sectorsize, lockend); |
| 1736 | if (lockend <= lockstart) |
| 1737 | lockend = lockstart + root->sectorsize; |
| 1738 | |
| 1739 | len = lockend - lockstart + 1; |
| 1740 | |
| 1741 | len = max_t(u64, len, root->sectorsize); |
| 1742 | if (inode->i_size == 0) |
| 1743 | return -ENXIO; |
| 1744 | |
| 1745 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, 0, |
| 1746 | &cached_state, GFP_NOFS); |
| 1747 | |
| 1748 | /* |
| 1749 | * Delalloc is such a pain. If we have a hole and we have pending |
| 1750 | * delalloc for a portion of the hole we will get back a hole that |
| 1751 | * exists for the entire range since it hasn't been actually written |
| 1752 | * yet. So to take care of this case we need to look for an extent just |
| 1753 | * before the position we want in case there is outstanding delalloc |
| 1754 | * going on here. |
| 1755 | */ |
| 1756 | if (origin == SEEK_HOLE && start != 0) { |
| 1757 | if (start <= root->sectorsize) |
| 1758 | em = btrfs_get_extent_fiemap(inode, NULL, 0, 0, |
| 1759 | root->sectorsize, 0); |
| 1760 | else |
| 1761 | em = btrfs_get_extent_fiemap(inode, NULL, 0, |
| 1762 | start - root->sectorsize, |
| 1763 | root->sectorsize, 0); |
| 1764 | if (IS_ERR(em)) { |
| 1765 | ret = -ENXIO; |
| 1766 | goto out; |
| 1767 | } |
| 1768 | last_end = em->start + em->len; |
| 1769 | if (em->block_start == EXTENT_MAP_DELALLOC) |
| 1770 | last_end = min_t(u64, last_end, inode->i_size); |
| 1771 | free_extent_map(em); |
| 1772 | } |
| 1773 | |
| 1774 | while (1) { |
| 1775 | em = btrfs_get_extent_fiemap(inode, NULL, 0, start, len, 0); |
| 1776 | if (IS_ERR(em)) { |
| 1777 | ret = -ENXIO; |
| 1778 | break; |
| 1779 | } |
| 1780 | |
| 1781 | if (em->block_start == EXTENT_MAP_HOLE) { |
| 1782 | if (test_bit(EXTENT_FLAG_VACANCY, &em->flags)) { |
| 1783 | if (last_end <= orig_start) { |
| 1784 | free_extent_map(em); |
| 1785 | ret = -ENXIO; |
| 1786 | break; |
| 1787 | } |
| 1788 | } |
| 1789 | |
| 1790 | if (origin == SEEK_HOLE) { |
| 1791 | *offset = start; |
| 1792 | free_extent_map(em); |
| 1793 | break; |
| 1794 | } |
| 1795 | } else { |
| 1796 | if (origin == SEEK_DATA) { |
| 1797 | if (em->block_start == EXTENT_MAP_DELALLOC) { |
| 1798 | if (start >= inode->i_size) { |
| 1799 | free_extent_map(em); |
| 1800 | ret = -ENXIO; |
| 1801 | break; |
| 1802 | } |
| 1803 | } |
| 1804 | |
| 1805 | *offset = start; |
| 1806 | free_extent_map(em); |
| 1807 | break; |
| 1808 | } |
| 1809 | } |
| 1810 | |
| 1811 | start = em->start + em->len; |
| 1812 | last_end = em->start + em->len; |
| 1813 | |
| 1814 | if (em->block_start == EXTENT_MAP_DELALLOC) |
| 1815 | last_end = min_t(u64, last_end, inode->i_size); |
| 1816 | |
| 1817 | if (test_bit(EXTENT_FLAG_VACANCY, &em->flags)) { |
| 1818 | free_extent_map(em); |
| 1819 | ret = -ENXIO; |
| 1820 | break; |
| 1821 | } |
| 1822 | free_extent_map(em); |
| 1823 | cond_resched(); |
| 1824 | } |
| 1825 | if (!ret) |
| 1826 | *offset = min(*offset, inode->i_size); |
| 1827 | out: |
| 1828 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 1829 | &cached_state, GFP_NOFS); |
| 1830 | return ret; |
| 1831 | } |
| 1832 | |
| 1833 | static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int origin) |
| 1834 | { |
| 1835 | struct inode *inode = file->f_mapping->host; |
| 1836 | int ret; |
| 1837 | |
| 1838 | mutex_lock(&inode->i_mutex); |
| 1839 | switch (origin) { |
| 1840 | case SEEK_END: |
| 1841 | case SEEK_CUR: |
Andi Kleen | ef3d0fd | 2011-09-15 16:06:48 -0700 | [diff] [blame] | 1842 | offset = generic_file_llseek(file, offset, origin); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 1843 | goto out; |
| 1844 | case SEEK_DATA: |
| 1845 | case SEEK_HOLE: |
Jeff Liu | 48802c8 | 2011-09-18 10:34:02 -0400 | [diff] [blame] | 1846 | if (offset >= i_size_read(inode)) { |
| 1847 | mutex_unlock(&inode->i_mutex); |
| 1848 | return -ENXIO; |
| 1849 | } |
| 1850 | |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 1851 | ret = find_desired_extent(inode, &offset, origin); |
| 1852 | if (ret) { |
| 1853 | mutex_unlock(&inode->i_mutex); |
| 1854 | return ret; |
| 1855 | } |
| 1856 | } |
| 1857 | |
Dan Carpenter | 9a4327c | 2011-08-18 10:16:05 -0400 | [diff] [blame] | 1858 | if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) { |
Jeff Liu | 48802c8 | 2011-09-18 10:34:02 -0400 | [diff] [blame] | 1859 | offset = -EINVAL; |
Dan Carpenter | 9a4327c | 2011-08-18 10:16:05 -0400 | [diff] [blame] | 1860 | goto out; |
| 1861 | } |
| 1862 | if (offset > inode->i_sb->s_maxbytes) { |
Jeff Liu | 48802c8 | 2011-09-18 10:34:02 -0400 | [diff] [blame] | 1863 | offset = -EINVAL; |
Dan Carpenter | 9a4327c | 2011-08-18 10:16:05 -0400 | [diff] [blame] | 1864 | goto out; |
| 1865 | } |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 1866 | |
| 1867 | /* Special lock needed here? */ |
| 1868 | if (offset != file->f_pos) { |
| 1869 | file->f_pos = offset; |
| 1870 | file->f_version = 0; |
| 1871 | } |
| 1872 | out: |
| 1873 | mutex_unlock(&inode->i_mutex); |
| 1874 | return offset; |
| 1875 | } |
| 1876 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 1877 | const struct file_operations btrfs_file_operations = { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 1878 | .llseek = btrfs_file_llseek, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1879 | .read = do_sync_read, |
Miao Xie | 4a001071 | 2010-06-07 03:38:51 +0000 | [diff] [blame] | 1880 | .write = do_sync_write, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1881 | .aio_read = generic_file_aio_read, |
Chris Mason | e9906a9 | 2007-12-14 12:56:58 -0500 | [diff] [blame] | 1882 | .splice_read = generic_file_splice_read, |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1883 | .aio_write = btrfs_file_aio_write, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1884 | .mmap = btrfs_file_mmap, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1885 | .open = generic_file_open, |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1886 | .release = btrfs_release_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1887 | .fsync = btrfs_sync_file, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1888 | .fallocate = btrfs_fallocate, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 1889 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1890 | #ifdef CONFIG_COMPAT |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 1891 | .compat_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1892 | #endif |
| 1893 | }; |