Commit | Line | Data |
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748de673 AF |
1 | /* |
2 | * Copyright (c) 2008,2009 NEC Software Tohoku, Ltd. | |
3 | * Written by Takashi Sato <t-sato@yk.jp.nec.com> | |
4 | * Akira Fujita <a-fujita@rs.jp.nec.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of version 2.1 of the GNU Lesser General Public License | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/fs.h> | |
17 | #include <linux/quotaops.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
748de673 | 19 | #include "ext4_jbd2.h" |
748de673 | 20 | #include "ext4.h" |
4a092d73 | 21 | #include "ext4_extents.h" |
748de673 | 22 | |
e8505970 AF |
23 | /** |
24 | * get_ext_path - Find an extent path for designated logical block number. | |
25 | * | |
26 | * @inode: an inode which is searched | |
27 | * @lblock: logical block number to find an extent path | |
28 | * @path: pointer to an extent path pointer (for output) | |
29 | * | |
ed8a1a76 | 30 | * ext4_find_extent wrapper. Return 0 on success, or a negative error value |
e8505970 AF |
31 | * on failure. |
32 | */ | |
33 | static inline int | |
34 | get_ext_path(struct inode *inode, ext4_lblk_t lblock, | |
3bdf14b4 | 35 | struct ext4_ext_path **ppath) |
e8505970 | 36 | { |
0e401101 | 37 | struct ext4_ext_path *path; |
e8505970 | 38 | |
ed8a1a76 | 39 | path = ext4_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE); |
0e401101 | 40 | if (IS_ERR(path)) |
3bdf14b4 TT |
41 | return PTR_ERR(path); |
42 | if (path[ext_depth(inode)].p_ext == NULL) { | |
43 | ext4_ext_drop_refs(path); | |
44 | kfree(path); | |
45 | *ppath = NULL; | |
46 | return -ENODATA; | |
47 | } | |
48 | *ppath = path; | |
49 | return 0; | |
e8505970 | 50 | } |
748de673 | 51 | |
748de673 | 52 | /** |
393d1d1d DTB |
53 | * ext4_double_down_write_data_sem - Acquire two inodes' write lock |
54 | * of i_data_sem | |
748de673 | 55 | * |
03bd8b9b | 56 | * Acquire write lock of i_data_sem of the two inodes |
748de673 | 57 | */ |
393d1d1d DTB |
58 | void |
59 | ext4_double_down_write_data_sem(struct inode *first, struct inode *second) | |
748de673 | 60 | { |
03bd8b9b DM |
61 | if (first < second) { |
62 | down_write(&EXT4_I(first)->i_data_sem); | |
63 | down_write_nested(&EXT4_I(second)->i_data_sem, SINGLE_DEPTH_NESTING); | |
64 | } else { | |
65 | down_write(&EXT4_I(second)->i_data_sem); | |
66 | down_write_nested(&EXT4_I(first)->i_data_sem, SINGLE_DEPTH_NESTING); | |
748de673 | 67 | |
748de673 | 68 | } |
748de673 AF |
69 | } |
70 | ||
71 | /** | |
393d1d1d | 72 | * ext4_double_up_write_data_sem - Release two inodes' write lock of i_data_sem |
748de673 AF |
73 | * |
74 | * @orig_inode: original inode structure to be released its lock first | |
75 | * @donor_inode: donor inode structure to be released its lock second | |
fc04cb49 | 76 | * Release write lock of i_data_sem of two inodes (orig and donor). |
748de673 | 77 | */ |
393d1d1d DTB |
78 | void |
79 | ext4_double_up_write_data_sem(struct inode *orig_inode, | |
80 | struct inode *donor_inode) | |
748de673 | 81 | { |
748de673 AF |
82 | up_write(&EXT4_I(orig_inode)->i_data_sem); |
83 | up_write(&EXT4_I(donor_inode)->i_data_sem); | |
84 | } | |
85 | ||
8c854473 DM |
86 | /** |
87 | * mext_check_coverage - Check that all extents in range has the same type | |
88 | * | |
89 | * @inode: inode in question | |
90 | * @from: block offset of inode | |
91 | * @count: block count to be checked | |
556615dc | 92 | * @unwritten: extents expected to be unwritten |
8c854473 DM |
93 | * @err: pointer to save error value |
94 | * | |
95 | * Return 1 if all extents in range has expected type, and zero otherwise. | |
96 | */ | |
97 | static int | |
98 | mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count, | |
556615dc | 99 | int unwritten, int *err) |
8c854473 DM |
100 | { |
101 | struct ext4_ext_path *path = NULL; | |
102 | struct ext4_extent *ext; | |
0e401101 | 103 | int ret = 0; |
8c854473 DM |
104 | ext4_lblk_t last = from + count; |
105 | while (from < last) { | |
106 | *err = get_ext_path(inode, from, &path); | |
107 | if (*err) | |
0e401101 | 108 | goto out; |
8c854473 | 109 | ext = path[ext_depth(inode)].p_ext; |
556615dc | 110 | if (unwritten != ext4_ext_is_unwritten(ext)) |
0e401101 | 111 | goto out; |
8c854473 DM |
112 | from += ext4_ext_get_actual_len(ext); |
113 | ext4_ext_drop_refs(path); | |
114 | } | |
0e401101 DM |
115 | ret = 1; |
116 | out: | |
b7ea89ad TT |
117 | ext4_ext_drop_refs(path); |
118 | kfree(path); | |
0e401101 | 119 | return ret; |
8c854473 DM |
120 | } |
121 | ||
bb557488 DM |
122 | /** |
123 | * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2 | |
124 | * | |
125 | * @inode1: the inode structure | |
126 | * @inode2: the inode structure | |
65dd8327 XW |
127 | * @index1: page index |
128 | * @index2: page index | |
bb557488 DM |
129 | * @page: result page vector |
130 | * | |
131 | * Grab two locked pages for inode's by inode order | |
132 | */ | |
133 | static int | |
134 | mext_page_double_lock(struct inode *inode1, struct inode *inode2, | |
fcf6b1b7 | 135 | pgoff_t index1, pgoff_t index2, struct page *page[2]) |
bb557488 DM |
136 | { |
137 | struct address_space *mapping[2]; | |
138 | unsigned fl = AOP_FLAG_NOFS; | |
139 | ||
140 | BUG_ON(!inode1 || !inode2); | |
141 | if (inode1 < inode2) { | |
142 | mapping[0] = inode1->i_mapping; | |
143 | mapping[1] = inode2->i_mapping; | |
144 | } else { | |
fcf6b1b7 DM |
145 | pgoff_t tmp = index1; |
146 | index1 = index2; | |
147 | index2 = tmp; | |
bb557488 DM |
148 | mapping[0] = inode2->i_mapping; |
149 | mapping[1] = inode1->i_mapping; | |
150 | } | |
151 | ||
fcf6b1b7 | 152 | page[0] = grab_cache_page_write_begin(mapping[0], index1, fl); |
bb557488 DM |
153 | if (!page[0]) |
154 | return -ENOMEM; | |
155 | ||
fcf6b1b7 | 156 | page[1] = grab_cache_page_write_begin(mapping[1], index2, fl); |
bb557488 DM |
157 | if (!page[1]) { |
158 | unlock_page(page[0]); | |
159 | page_cache_release(page[0]); | |
160 | return -ENOMEM; | |
161 | } | |
7e8b12c6 DM |
162 | /* |
163 | * grab_cache_page_write_begin() may not wait on page's writeback if | |
164 | * BDI not demand that. But it is reasonable to be very conservative | |
165 | * here and explicitly wait on page's writeback | |
166 | */ | |
167 | wait_on_page_writeback(page[0]); | |
168 | wait_on_page_writeback(page[1]); | |
bb557488 DM |
169 | if (inode1 > inode2) { |
170 | struct page *tmp; | |
171 | tmp = page[0]; | |
172 | page[0] = page[1]; | |
173 | page[1] = tmp; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /* Force page buffers uptodate w/o dropping page's lock */ | |
179 | static int | |
180 | mext_page_mkuptodate(struct page *page, unsigned from, unsigned to) | |
181 | { | |
182 | struct inode *inode = page->mapping->host; | |
183 | sector_t block; | |
184 | struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; | |
185 | unsigned int blocksize, block_start, block_end; | |
186 | int i, err, nr = 0, partial = 0; | |
187 | BUG_ON(!PageLocked(page)); | |
188 | BUG_ON(PageWriteback(page)); | |
189 | ||
190 | if (PageUptodate(page)) | |
191 | return 0; | |
192 | ||
193 | blocksize = 1 << inode->i_blkbits; | |
194 | if (!page_has_buffers(page)) | |
195 | create_empty_buffers(page, blocksize, 0); | |
196 | ||
197 | head = page_buffers(page); | |
198 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
199 | for (bh = head, block_start = 0; bh != head || !block_start; | |
200 | block++, block_start = block_end, bh = bh->b_this_page) { | |
201 | block_end = block_start + blocksize; | |
202 | if (block_end <= from || block_start >= to) { | |
203 | if (!buffer_uptodate(bh)) | |
204 | partial = 1; | |
205 | continue; | |
206 | } | |
207 | if (buffer_uptodate(bh)) | |
208 | continue; | |
209 | if (!buffer_mapped(bh)) { | |
bb557488 DM |
210 | err = ext4_get_block(inode, block, bh, 0); |
211 | if (err) { | |
212 | SetPageError(page); | |
213 | return err; | |
214 | } | |
215 | if (!buffer_mapped(bh)) { | |
216 | zero_user(page, block_start, blocksize); | |
df3a98b0 | 217 | set_buffer_uptodate(bh); |
bb557488 DM |
218 | continue; |
219 | } | |
220 | } | |
221 | BUG_ON(nr >= MAX_BUF_PER_PAGE); | |
222 | arr[nr++] = bh; | |
223 | } | |
224 | /* No io required */ | |
225 | if (!nr) | |
226 | goto out; | |
227 | ||
228 | for (i = 0; i < nr; i++) { | |
229 | bh = arr[i]; | |
230 | if (!bh_uptodate_or_lock(bh)) { | |
231 | err = bh_submit_read(bh); | |
232 | if (err) | |
233 | return err; | |
234 | } | |
235 | } | |
236 | out: | |
237 | if (!partial) | |
238 | SetPageUptodate(page); | |
239 | return 0; | |
240 | } | |
241 | ||
748de673 AF |
242 | /** |
243 | * move_extent_per_page - Move extent data per page | |
244 | * | |
245 | * @o_filp: file structure of original file | |
246 | * @donor_inode: donor inode | |
247 | * @orig_page_offset: page index on original file | |
65dd8327 | 248 | * @donor_page_offset: page index on donor file |
748de673 AF |
249 | * @data_offset_in_page: block index where data swapping starts |
250 | * @block_len_in_page: the number of blocks to be swapped | |
556615dc | 251 | * @unwritten: orig extent is unwritten or not |
f868a48d | 252 | * @err: pointer to save return value |
748de673 AF |
253 | * |
254 | * Save the data in original inode blocks and replace original inode extents | |
65dd8327 | 255 | * with donor inode extents by calling ext4_swap_extents(). |
f868a48d AF |
256 | * Finally, write out the saved data in new original inode blocks. Return |
257 | * replaced block count. | |
748de673 AF |
258 | */ |
259 | static int | |
44fc48f7 | 260 | move_extent_per_page(struct file *o_filp, struct inode *donor_inode, |
fcf6b1b7 DM |
261 | pgoff_t orig_page_offset, pgoff_t donor_page_offset, |
262 | int data_offset_in_page, | |
263 | int block_len_in_page, int unwritten, int *err) | |
748de673 | 264 | { |
496ad9aa | 265 | struct inode *orig_inode = file_inode(o_filp); |
bb557488 | 266 | struct page *pagep[2] = {NULL, NULL}; |
748de673 | 267 | handle_t *handle; |
fcf6b1b7 | 268 | ext4_lblk_t orig_blk_offset, donor_blk_offset; |
748de673 | 269 | unsigned long blocksize = orig_inode->i_sb->s_blocksize; |
f868a48d | 270 | unsigned int tmp_data_size, data_size, replaced_size; |
bb557488 | 271 | int err2, jblocks, retries = 0; |
f868a48d | 272 | int replaced_count = 0; |
bb557488 | 273 | int from = data_offset_in_page << orig_inode->i_blkbits; |
748de673 | 274 | int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; |
88c6b61f | 275 | struct super_block *sb = orig_inode->i_sb; |
748de673 AF |
276 | |
277 | /* | |
278 | * It needs twice the amount of ordinary journal buffers because | |
279 | * inode and donor_inode may change each different metadata blocks. | |
280 | */ | |
bb557488 DM |
281 | again: |
282 | *err = 0; | |
748de673 | 283 | jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; |
9924a92a | 284 | handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks); |
748de673 | 285 | if (IS_ERR(handle)) { |
f868a48d AF |
286 | *err = PTR_ERR(handle); |
287 | return 0; | |
748de673 AF |
288 | } |
289 | ||
748de673 AF |
290 | orig_blk_offset = orig_page_offset * blocks_per_page + |
291 | data_offset_in_page; | |
292 | ||
fcf6b1b7 DM |
293 | donor_blk_offset = donor_page_offset * blocks_per_page + |
294 | data_offset_in_page; | |
295 | ||
f868a48d | 296 | /* Calculate data_size */ |
748de673 AF |
297 | if ((orig_blk_offset + block_len_in_page - 1) == |
298 | ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { | |
299 | /* Replace the last block */ | |
f868a48d | 300 | tmp_data_size = orig_inode->i_size & (blocksize - 1); |
748de673 | 301 | /* |
f868a48d | 302 | * If data_size equal zero, it shows data_size is multiples of |
748de673 AF |
303 | * blocksize. So we set appropriate value. |
304 | */ | |
f868a48d AF |
305 | if (tmp_data_size == 0) |
306 | tmp_data_size = blocksize; | |
748de673 | 307 | |
f868a48d | 308 | data_size = tmp_data_size + |
748de673 | 309 | ((block_len_in_page - 1) << orig_inode->i_blkbits); |
f868a48d AF |
310 | } else |
311 | data_size = block_len_in_page << orig_inode->i_blkbits; | |
312 | ||
313 | replaced_size = data_size; | |
748de673 | 314 | |
bb557488 | 315 | *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset, |
fcf6b1b7 | 316 | donor_page_offset, pagep); |
f868a48d | 317 | if (unlikely(*err < 0)) |
bb557488 | 318 | goto stop_journal; |
8c854473 | 319 | /* |
556615dc | 320 | * If orig extent was unwritten it can become initialized |
8c854473 DM |
321 | * at any time after i_data_sem was dropped, in order to |
322 | * serialize with delalloc we have recheck extent while we | |
323 | * hold page's lock, if it is still the case data copy is not | |
324 | * necessary, just swap data blocks between orig and donor. | |
325 | */ | |
556615dc | 326 | if (unwritten) { |
393d1d1d | 327 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
8c854473 DM |
328 | /* If any of extents in range became initialized we have to |
329 | * fallback to data copying */ | |
556615dc LC |
330 | unwritten = mext_check_coverage(orig_inode, orig_blk_offset, |
331 | block_len_in_page, 1, err); | |
8c854473 DM |
332 | if (*err) |
333 | goto drop_data_sem; | |
748de673 | 334 | |
fcf6b1b7 | 335 | unwritten &= mext_check_coverage(donor_inode, donor_blk_offset, |
556615dc | 336 | block_len_in_page, 1, err); |
8c854473 DM |
337 | if (*err) |
338 | goto drop_data_sem; | |
339 | ||
556615dc | 340 | if (!unwritten) { |
393d1d1d | 341 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
8c854473 DM |
342 | goto data_copy; |
343 | } | |
344 | if ((page_has_private(pagep[0]) && | |
345 | !try_to_release_page(pagep[0], 0)) || | |
346 | (page_has_private(pagep[1]) && | |
347 | !try_to_release_page(pagep[1], 0))) { | |
348 | *err = -EBUSY; | |
349 | goto drop_data_sem; | |
350 | } | |
fcf6b1b7 DM |
351 | replaced_count = ext4_swap_extents(handle, orig_inode, |
352 | donor_inode, orig_blk_offset, | |
353 | donor_blk_offset, | |
354 | block_len_in_page, 1, err); | |
8c854473 | 355 | drop_data_sem: |
393d1d1d | 356 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
8c854473 DM |
357 | goto unlock_pages; |
358 | } | |
359 | data_copy: | |
bb557488 DM |
360 | *err = mext_page_mkuptodate(pagep[0], from, from + replaced_size); |
361 | if (*err) | |
362 | goto unlock_pages; | |
363 | ||
364 | /* At this point all buffers in range are uptodate, old mapping layout | |
365 | * is no longer required, try to drop it now. */ | |
366 | if ((page_has_private(pagep[0]) && !try_to_release_page(pagep[0], 0)) || | |
367 | (page_has_private(pagep[1]) && !try_to_release_page(pagep[1], 0))) { | |
368 | *err = -EBUSY; | |
369 | goto unlock_pages; | |
748de673 | 370 | } |
6e263146 | 371 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
fcf6b1b7 DM |
372 | replaced_count = ext4_swap_extents(handle, orig_inode, donor_inode, |
373 | orig_blk_offset, donor_blk_offset, | |
374 | block_len_in_page, 1, err); | |
6e263146 | 375 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
bb557488 | 376 | if (*err) { |
f868a48d AF |
377 | if (replaced_count) { |
378 | block_len_in_page = replaced_count; | |
379 | replaced_size = | |
380 | block_len_in_page << orig_inode->i_blkbits; | |
ac48b0a1 | 381 | } else |
bb557488 | 382 | goto unlock_pages; |
748de673 | 383 | } |
bb557488 DM |
384 | /* Perform all necessary steps similar write_begin()/write_end() |
385 | * but keeping in mind that i_size will not change */ | |
7e8b12c6 | 386 | *err = __block_write_begin(pagep[0], from, replaced_size, |
bb557488 DM |
387 | ext4_get_block); |
388 | if (!*err) | |
389 | *err = block_commit_write(pagep[0], from, from + replaced_size); | |
748de673 | 390 | |
bb557488 DM |
391 | if (unlikely(*err < 0)) |
392 | goto repair_branches; | |
393 | ||
394 | /* Even in case of data=writeback it is reasonable to pin | |
395 | * inode to transaction, to prevent unexpected data loss */ | |
396 | *err = ext4_jbd2_file_inode(handle, orig_inode); | |
397 | ||
398 | unlock_pages: | |
399 | unlock_page(pagep[0]); | |
400 | page_cache_release(pagep[0]); | |
401 | unlock_page(pagep[1]); | |
402 | page_cache_release(pagep[1]); | |
403 | stop_journal: | |
748de673 | 404 | ext4_journal_stop(handle); |
88c6b61f DM |
405 | if (*err == -ENOSPC && |
406 | ext4_should_retry_alloc(sb, &retries)) | |
407 | goto again; | |
bb557488 DM |
408 | /* Buffer was busy because probably is pinned to journal transaction, |
409 | * force transaction commit may help to free it. */ | |
88c6b61f DM |
410 | if (*err == -EBUSY && retries++ < 4 && EXT4_SB(sb)->s_journal && |
411 | jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal)) | |
bb557488 | 412 | goto again; |
f868a48d | 413 | return replaced_count; |
bb557488 DM |
414 | |
415 | repair_branches: | |
416 | /* | |
417 | * This should never ever happen! | |
418 | * Extents are swapped already, but we are not able to copy data. | |
419 | * Try to swap extents to it's original places | |
420 | */ | |
393d1d1d | 421 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
fcf6b1b7 DM |
422 | replaced_count = ext4_swap_extents(handle, donor_inode, orig_inode, |
423 | orig_blk_offset, donor_blk_offset, | |
424 | block_len_in_page, 0, &err2); | |
393d1d1d | 425 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
bb557488 DM |
426 | if (replaced_count != block_len_in_page) { |
427 | EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset), | |
428 | "Unable to copy data block," | |
429 | " data will be lost."); | |
430 | *err = -EIO; | |
431 | } | |
432 | replaced_count = 0; | |
433 | goto unlock_pages; | |
748de673 AF |
434 | } |
435 | ||
436 | /** | |
c437b273 | 437 | * mext_check_arguments - Check whether move extent can be done |
748de673 AF |
438 | * |
439 | * @orig_inode: original inode | |
440 | * @donor_inode: donor inode | |
441 | * @orig_start: logical start offset in block for orig | |
442 | * @donor_start: logical start offset in block for donor | |
443 | * @len: the number of blocks to be moved | |
748de673 AF |
444 | * |
445 | * Check the arguments of ext4_move_extents() whether the files can be | |
446 | * exchanged with each other. | |
447 | * Return 0 on success, or a negative error value on failure. | |
448 | */ | |
449 | static int | |
450 | mext_check_arguments(struct inode *orig_inode, | |
446aaa6e KM |
451 | struct inode *donor_inode, __u64 orig_start, |
452 | __u64 donor_start, __u64 *len) | |
748de673 | 453 | { |
fcf6b1b7 | 454 | __u64 orig_eof, donor_eof; |
70d5d3dc AF |
455 | unsigned int blkbits = orig_inode->i_blkbits; |
456 | unsigned int blocksize = 1 << blkbits; | |
457 | ||
fcf6b1b7 DM |
458 | orig_eof = (i_size_read(orig_inode) + blocksize - 1) >> blkbits; |
459 | donor_eof = (i_size_read(donor_inode) + blocksize - 1) >> blkbits; | |
460 | ||
461 | ||
4a58579b AF |
462 | if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { |
463 | ext4_debug("ext4 move extent: suid or sgid is set" | |
464 | " to donor file [ino:orig %lu, donor %lu]\n", | |
465 | orig_inode->i_ino, donor_inode->i_ino); | |
466 | return -EINVAL; | |
467 | } | |
468 | ||
1f5a81e4 TT |
469 | if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) |
470 | return -EPERM; | |
471 | ||
748de673 AF |
472 | /* Ext4 move extent does not support swapfile */ |
473 | if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { | |
474 | ext4_debug("ext4 move extent: The argument files should " | |
475 | "not be swapfile [ino:orig %lu, donor %lu]\n", | |
476 | orig_inode->i_ino, donor_inode->i_ino); | |
fcf6b1b7 | 477 | return -EBUSY; |
748de673 AF |
478 | } |
479 | ||
748de673 | 480 | /* Ext4 move extent supports only extent based file */ |
12e9b892 | 481 | if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) { |
748de673 AF |
482 | ext4_debug("ext4 move extent: orig file is not extents " |
483 | "based file [ino:orig %lu]\n", orig_inode->i_ino); | |
484 | return -EOPNOTSUPP; | |
12e9b892 | 485 | } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) { |
748de673 AF |
486 | ext4_debug("ext4 move extent: donor file is not extents " |
487 | "based file [ino:donor %lu]\n", donor_inode->i_ino); | |
488 | return -EOPNOTSUPP; | |
489 | } | |
490 | ||
491 | if ((!orig_inode->i_size) || (!donor_inode->i_size)) { | |
492 | ext4_debug("ext4 move extent: File size is 0 byte\n"); | |
493 | return -EINVAL; | |
494 | } | |
495 | ||
496 | /* Start offset should be same */ | |
fcf6b1b7 DM |
497 | if ((orig_start & ~(PAGE_MASK >> orig_inode->i_blkbits)) != |
498 | (donor_start & ~(PAGE_MASK >> orig_inode->i_blkbits))) { | |
748de673 | 499 | ext4_debug("ext4 move extent: orig and donor's start " |
fcf6b1b7 | 500 | "offset are not alligned [ino:orig %lu, donor %lu]\n", |
748de673 AF |
501 | orig_inode->i_ino, donor_inode->i_ino); |
502 | return -EINVAL; | |
503 | } | |
504 | ||
f17722f9 | 505 | if ((orig_start >= EXT_MAX_BLOCKS) || |
fcf6b1b7 | 506 | (donor_start >= EXT_MAX_BLOCKS) || |
f17722f9 | 507 | (*len > EXT_MAX_BLOCKS) || |
fcf6b1b7 | 508 | (donor_start + *len >= EXT_MAX_BLOCKS) || |
f17722f9 | 509 | (orig_start + *len >= EXT_MAX_BLOCKS)) { |
0a80e986 | 510 | ext4_debug("ext4 move extent: Can't handle over [%u] blocks " |
f17722f9 | 511 | "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, |
748de673 AF |
512 | orig_inode->i_ino, donor_inode->i_ino); |
513 | return -EINVAL; | |
514 | } | |
fcf6b1b7 DM |
515 | if (orig_eof < orig_start + *len - 1) |
516 | *len = orig_eof - orig_start; | |
517 | if (donor_eof < donor_start + *len - 1) | |
518 | *len = donor_eof - donor_start; | |
748de673 | 519 | if (!*len) { |
92c28159 | 520 | ext4_debug("ext4 move extent: len should not be 0 " |
748de673 AF |
521 | "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, |
522 | donor_inode->i_ino); | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
748de673 AF |
529 | /** |
530 | * ext4_move_extents - Exchange the specified range of a file | |
531 | * | |
532 | * @o_filp: file structure of the original file | |
533 | * @d_filp: file structure of the donor file | |
65dd8327 XW |
534 | * @orig_blk: start offset in block for orig |
535 | * @donor_blk: start offset in block for donor | |
748de673 AF |
536 | * @len: the number of blocks to be moved |
537 | * @moved_len: moved block length | |
538 | * | |
539 | * This function returns 0 and moved block length is set in moved_len | |
540 | * if succeed, otherwise returns error value. | |
541 | * | |
748de673 AF |
542 | */ |
543 | int | |
fcf6b1b7 DM |
544 | ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk, |
545 | __u64 donor_blk, __u64 len, __u64 *moved_len) | |
748de673 | 546 | { |
496ad9aa AV |
547 | struct inode *orig_inode = file_inode(o_filp); |
548 | struct inode *donor_inode = file_inode(d_filp); | |
fcf6b1b7 | 549 | struct ext4_ext_path *path = NULL; |
748de673 | 550 | int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; |
fcf6b1b7 DM |
551 | ext4_lblk_t o_end, o_start = orig_blk; |
552 | ext4_lblk_t d_start = donor_blk; | |
553 | int ret; | |
748de673 | 554 | |
03bd8b9b DM |
555 | if (orig_inode->i_sb != donor_inode->i_sb) { |
556 | ext4_debug("ext4 move extent: The argument files " | |
557 | "should be in same FS [ino:orig %lu, donor %lu]\n", | |
558 | orig_inode->i_ino, donor_inode->i_ino); | |
559 | return -EINVAL; | |
560 | } | |
561 | ||
562 | /* orig and donor should be different inodes */ | |
563 | if (orig_inode == donor_inode) { | |
f3ce8064 | 564 | ext4_debug("ext4 move extent: The argument files should not " |
03bd8b9b | 565 | "be same inode [ino:orig %lu, donor %lu]\n", |
f3ce8064 TT |
566 | orig_inode->i_ino, donor_inode->i_ino); |
567 | return -EINVAL; | |
568 | } | |
569 | ||
7247c0ca AF |
570 | /* Regular file check */ |
571 | if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { | |
572 | ext4_debug("ext4 move extent: The argument files should be " | |
573 | "regular file [ino:orig %lu, donor %lu]\n", | |
574 | orig_inode->i_ino, donor_inode->i_ino); | |
575 | return -EINVAL; | |
576 | } | |
f066055a DM |
577 | /* TODO: This is non obvious task to swap blocks for inodes with full |
578 | jornaling enabled */ | |
579 | if (ext4_should_journal_data(orig_inode) || | |
580 | ext4_should_journal_data(donor_inode)) { | |
581 | return -EINVAL; | |
582 | } | |
fc04cb49 | 583 | /* Protect orig and donor inodes against a truncate */ |
375e289e | 584 | lock_two_nondirectories(orig_inode, donor_inode); |
748de673 | 585 | |
17335dcc DM |
586 | /* Wait for all existing dio workers */ |
587 | ext4_inode_block_unlocked_dio(orig_inode); | |
588 | ext4_inode_block_unlocked_dio(donor_inode); | |
589 | inode_dio_wait(orig_inode); | |
590 | inode_dio_wait(donor_inode); | |
591 | ||
fc04cb49 | 592 | /* Protect extent tree against block allocations via delalloc */ |
393d1d1d | 593 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
748de673 | 594 | /* Check the filesystem environment whether move_extent can be done */ |
fcf6b1b7 DM |
595 | ret = mext_check_arguments(orig_inode, donor_inode, orig_blk, |
596 | donor_blk, &len); | |
03bd8b9b | 597 | if (ret) |
347fa6f1 | 598 | goto out; |
fcf6b1b7 | 599 | o_end = o_start + len; |
748de673 | 600 | |
fcf6b1b7 DM |
601 | while (o_start < o_end) { |
602 | struct ext4_extent *ex; | |
603 | ext4_lblk_t cur_blk, next_blk; | |
604 | pgoff_t orig_page_index, donor_page_index; | |
605 | int offset_in_page; | |
606 | int unwritten, cur_len; | |
748de673 | 607 | |
fcf6b1b7 DM |
608 | ret = get_ext_path(orig_inode, o_start, &path); |
609 | if (ret) | |
748de673 | 610 | goto out; |
fcf6b1b7 DM |
611 | ex = path[path->p_depth].p_ext; |
612 | next_blk = ext4_ext_next_allocated_block(path); | |
613 | cur_blk = le32_to_cpu(ex->ee_block); | |
614 | cur_len = ext4_ext_get_actual_len(ex); | |
615 | /* Check hole before the start pos */ | |
616 | if (cur_blk + cur_len - 1 < o_start) { | |
617 | if (next_blk == EXT_MAX_BLOCKS) { | |
618 | o_start = o_end; | |
619 | ret = -ENODATA; | |
620 | goto out; | |
621 | } | |
622 | d_start += next_blk - o_start; | |
623 | o_start = next_blk; | |
3bdf14b4 | 624 | continue; |
fcf6b1b7 DM |
625 | /* Check hole after the start pos */ |
626 | } else if (cur_blk > o_start) { | |
627 | /* Skip hole */ | |
628 | d_start += cur_blk - o_start; | |
629 | o_start = cur_blk; | |
630 | /* Extent inside requested range ?*/ | |
631 | if (cur_blk >= o_end) | |
632 | goto out; | |
633 | } else { /* in_range(o_start, o_blk, o_len) */ | |
634 | cur_len += cur_blk - o_start; | |
748de673 | 635 | } |
fcf6b1b7 DM |
636 | unwritten = ext4_ext_is_unwritten(ex); |
637 | if (o_end - o_start < cur_len) | |
638 | cur_len = o_end - o_start; | |
639 | ||
640 | orig_page_index = o_start >> (PAGE_CACHE_SHIFT - | |
641 | orig_inode->i_blkbits); | |
642 | donor_page_index = d_start >> (PAGE_CACHE_SHIFT - | |
643 | donor_inode->i_blkbits); | |
644 | offset_in_page = o_start % blocks_per_page; | |
645 | if (cur_len > blocks_per_page- offset_in_page) | |
646 | cur_len = blocks_per_page - offset_in_page; | |
fc04cb49 AF |
647 | /* |
648 | * Up semaphore to avoid following problems: | |
649 | * a. transaction deadlock among ext4_journal_start, | |
650 | * ->write_begin via pagefault, and jbd2_journal_commit | |
651 | * b. racing with ->readpage, ->write_begin, and ext4_get_block | |
652 | * in move_extent_per_page | |
653 | */ | |
393d1d1d | 654 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
fcf6b1b7 DM |
655 | /* Swap original branches with new branches */ |
656 | move_extent_per_page(o_filp, donor_inode, | |
657 | orig_page_index, donor_page_index, | |
658 | offset_in_page, cur_len, | |
659 | unwritten, &ret); | |
393d1d1d | 660 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
03bd8b9b | 661 | if (ret < 0) |
fc04cb49 | 662 | break; |
fcf6b1b7 DM |
663 | o_start += cur_len; |
664 | d_start += cur_len; | |
748de673 | 665 | } |
fcf6b1b7 DM |
666 | *moved_len = o_start - orig_blk; |
667 | if (*moved_len > len) | |
668 | *moved_len = len; | |
669 | ||
748de673 | 670 | out: |
94d7c16c AF |
671 | if (*moved_len) { |
672 | ext4_discard_preallocations(orig_inode); | |
673 | ext4_discard_preallocations(donor_inode); | |
674 | } | |
675 | ||
b7ea89ad TT |
676 | ext4_ext_drop_refs(path); |
677 | kfree(path); | |
393d1d1d | 678 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
17335dcc DM |
679 | ext4_inode_resume_unlocked_dio(orig_inode); |
680 | ext4_inode_resume_unlocked_dio(donor_inode); | |
375e289e | 681 | unlock_two_nondirectories(orig_inode, donor_inode); |
748de673 | 682 | |
03bd8b9b | 683 | return ret; |
748de673 | 684 | } |