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f5166768 | 1 | // SPDX-License-Identifier: LGPL-2.1 |
748de673 AF |
2 | /* |
3 | * Copyright (c) 2008,2009 NEC Software Tohoku, Ltd. | |
4 | * Written by Takashi Sato <t-sato@yk.jp.nec.com> | |
5 | * Akira Fujita <a-fujita@rs.jp.nec.com> | |
748de673 AF |
6 | */ |
7 | ||
8 | #include <linux/fs.h> | |
9 | #include <linux/quotaops.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
748de673 | 11 | #include "ext4_jbd2.h" |
748de673 | 12 | #include "ext4.h" |
4a092d73 | 13 | #include "ext4_extents.h" |
748de673 | 14 | |
e8505970 AF |
15 | /** |
16 | * get_ext_path - Find an extent path for designated logical block number. | |
17 | * | |
18 | * @inode: an inode which is searched | |
19 | * @lblock: logical block number to find an extent path | |
20 | * @path: pointer to an extent path pointer (for output) | |
21 | * | |
ed8a1a76 | 22 | * ext4_find_extent wrapper. Return 0 on success, or a negative error value |
e8505970 AF |
23 | * on failure. |
24 | */ | |
25 | static inline int | |
26 | get_ext_path(struct inode *inode, ext4_lblk_t lblock, | |
3bdf14b4 | 27 | struct ext4_ext_path **ppath) |
e8505970 | 28 | { |
0e401101 | 29 | struct ext4_ext_path *path; |
e8505970 | 30 | |
ed8a1a76 | 31 | path = ext4_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE); |
0e401101 | 32 | if (IS_ERR(path)) |
3bdf14b4 TT |
33 | return PTR_ERR(path); |
34 | if (path[ext_depth(inode)].p_ext == NULL) { | |
35 | ext4_ext_drop_refs(path); | |
36 | kfree(path); | |
37 | *ppath = NULL; | |
38 | return -ENODATA; | |
39 | } | |
40 | *ppath = path; | |
41 | return 0; | |
e8505970 | 42 | } |
748de673 | 43 | |
748de673 | 44 | /** |
393d1d1d DTB |
45 | * ext4_double_down_write_data_sem - Acquire two inodes' write lock |
46 | * of i_data_sem | |
748de673 | 47 | * |
03bd8b9b | 48 | * Acquire write lock of i_data_sem of the two inodes |
748de673 | 49 | */ |
393d1d1d DTB |
50 | void |
51 | ext4_double_down_write_data_sem(struct inode *first, struct inode *second) | |
748de673 | 52 | { |
03bd8b9b DM |
53 | if (first < second) { |
54 | down_write(&EXT4_I(first)->i_data_sem); | |
daf647d2 | 55 | down_write_nested(&EXT4_I(second)->i_data_sem, I_DATA_SEM_OTHER); |
03bd8b9b DM |
56 | } else { |
57 | down_write(&EXT4_I(second)->i_data_sem); | |
daf647d2 | 58 | down_write_nested(&EXT4_I(first)->i_data_sem, I_DATA_SEM_OTHER); |
748de673 | 59 | |
748de673 | 60 | } |
748de673 AF |
61 | } |
62 | ||
63 | /** | |
393d1d1d | 64 | * ext4_double_up_write_data_sem - Release two inodes' write lock of i_data_sem |
748de673 AF |
65 | * |
66 | * @orig_inode: original inode structure to be released its lock first | |
67 | * @donor_inode: donor inode structure to be released its lock second | |
fc04cb49 | 68 | * Release write lock of i_data_sem of two inodes (orig and donor). |
748de673 | 69 | */ |
393d1d1d DTB |
70 | void |
71 | ext4_double_up_write_data_sem(struct inode *orig_inode, | |
72 | struct inode *donor_inode) | |
748de673 | 73 | { |
748de673 AF |
74 | up_write(&EXT4_I(orig_inode)->i_data_sem); |
75 | up_write(&EXT4_I(donor_inode)->i_data_sem); | |
76 | } | |
77 | ||
8c854473 DM |
78 | /** |
79 | * mext_check_coverage - Check that all extents in range has the same type | |
80 | * | |
81 | * @inode: inode in question | |
82 | * @from: block offset of inode | |
83 | * @count: block count to be checked | |
556615dc | 84 | * @unwritten: extents expected to be unwritten |
8c854473 DM |
85 | * @err: pointer to save error value |
86 | * | |
87 | * Return 1 if all extents in range has expected type, and zero otherwise. | |
88 | */ | |
89 | static int | |
90 | mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count, | |
556615dc | 91 | int unwritten, int *err) |
8c854473 DM |
92 | { |
93 | struct ext4_ext_path *path = NULL; | |
94 | struct ext4_extent *ext; | |
0e401101 | 95 | int ret = 0; |
8c854473 DM |
96 | ext4_lblk_t last = from + count; |
97 | while (from < last) { | |
98 | *err = get_ext_path(inode, from, &path); | |
99 | if (*err) | |
0e401101 | 100 | goto out; |
8c854473 | 101 | ext = path[ext_depth(inode)].p_ext; |
556615dc | 102 | if (unwritten != ext4_ext_is_unwritten(ext)) |
0e401101 | 103 | goto out; |
8c854473 DM |
104 | from += ext4_ext_get_actual_len(ext); |
105 | ext4_ext_drop_refs(path); | |
106 | } | |
0e401101 DM |
107 | ret = 1; |
108 | out: | |
b7ea89ad TT |
109 | ext4_ext_drop_refs(path); |
110 | kfree(path); | |
0e401101 | 111 | return ret; |
8c854473 DM |
112 | } |
113 | ||
bb557488 DM |
114 | /** |
115 | * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2 | |
116 | * | |
117 | * @inode1: the inode structure | |
118 | * @inode2: the inode structure | |
65dd8327 XW |
119 | * @index1: page index |
120 | * @index2: page index | |
bb557488 DM |
121 | * @page: result page vector |
122 | * | |
123 | * Grab two locked pages for inode's by inode order | |
124 | */ | |
125 | static int | |
126 | mext_page_double_lock(struct inode *inode1, struct inode *inode2, | |
fcf6b1b7 | 127 | pgoff_t index1, pgoff_t index2, struct page *page[2]) |
bb557488 DM |
128 | { |
129 | struct address_space *mapping[2]; | |
130 | unsigned fl = AOP_FLAG_NOFS; | |
131 | ||
132 | BUG_ON(!inode1 || !inode2); | |
133 | if (inode1 < inode2) { | |
134 | mapping[0] = inode1->i_mapping; | |
135 | mapping[1] = inode2->i_mapping; | |
136 | } else { | |
fcf6b1b7 DM |
137 | pgoff_t tmp = index1; |
138 | index1 = index2; | |
139 | index2 = tmp; | |
bb557488 DM |
140 | mapping[0] = inode2->i_mapping; |
141 | mapping[1] = inode1->i_mapping; | |
142 | } | |
143 | ||
fcf6b1b7 | 144 | page[0] = grab_cache_page_write_begin(mapping[0], index1, fl); |
bb557488 DM |
145 | if (!page[0]) |
146 | return -ENOMEM; | |
147 | ||
fcf6b1b7 | 148 | page[1] = grab_cache_page_write_begin(mapping[1], index2, fl); |
bb557488 DM |
149 | if (!page[1]) { |
150 | unlock_page(page[0]); | |
09cbfeaf | 151 | put_page(page[0]); |
bb557488 DM |
152 | return -ENOMEM; |
153 | } | |
7e8b12c6 DM |
154 | /* |
155 | * grab_cache_page_write_begin() may not wait on page's writeback if | |
156 | * BDI not demand that. But it is reasonable to be very conservative | |
157 | * here and explicitly wait on page's writeback | |
158 | */ | |
159 | wait_on_page_writeback(page[0]); | |
160 | wait_on_page_writeback(page[1]); | |
bf865467 FF |
161 | if (inode1 > inode2) |
162 | swap(page[0], page[1]); | |
163 | ||
bb557488 DM |
164 | return 0; |
165 | } | |
166 | ||
167 | /* Force page buffers uptodate w/o dropping page's lock */ | |
168 | static int | |
169 | mext_page_mkuptodate(struct page *page, unsigned from, unsigned to) | |
170 | { | |
171 | struct inode *inode = page->mapping->host; | |
172 | sector_t block; | |
173 | struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; | |
174 | unsigned int blocksize, block_start, block_end; | |
175 | int i, err, nr = 0, partial = 0; | |
176 | BUG_ON(!PageLocked(page)); | |
177 | BUG_ON(PageWriteback(page)); | |
178 | ||
179 | if (PageUptodate(page)) | |
180 | return 0; | |
181 | ||
93407472 | 182 | blocksize = i_blocksize(inode); |
bb557488 DM |
183 | if (!page_has_buffers(page)) |
184 | create_empty_buffers(page, blocksize, 0); | |
185 | ||
186 | head = page_buffers(page); | |
09cbfeaf | 187 | block = (sector_t)page->index << (PAGE_SHIFT - inode->i_blkbits); |
bb557488 DM |
188 | for (bh = head, block_start = 0; bh != head || !block_start; |
189 | block++, block_start = block_end, bh = bh->b_this_page) { | |
190 | block_end = block_start + blocksize; | |
191 | if (block_end <= from || block_start >= to) { | |
192 | if (!buffer_uptodate(bh)) | |
193 | partial = 1; | |
194 | continue; | |
195 | } | |
196 | if (buffer_uptodate(bh)) | |
197 | continue; | |
198 | if (!buffer_mapped(bh)) { | |
bb557488 DM |
199 | err = ext4_get_block(inode, block, bh, 0); |
200 | if (err) { | |
201 | SetPageError(page); | |
202 | return err; | |
203 | } | |
204 | if (!buffer_mapped(bh)) { | |
205 | zero_user(page, block_start, blocksize); | |
df3a98b0 | 206 | set_buffer_uptodate(bh); |
bb557488 DM |
207 | continue; |
208 | } | |
209 | } | |
210 | BUG_ON(nr >= MAX_BUF_PER_PAGE); | |
211 | arr[nr++] = bh; | |
212 | } | |
213 | /* No io required */ | |
214 | if (!nr) | |
215 | goto out; | |
216 | ||
217 | for (i = 0; i < nr; i++) { | |
218 | bh = arr[i]; | |
219 | if (!bh_uptodate_or_lock(bh)) { | |
220 | err = bh_submit_read(bh); | |
221 | if (err) | |
222 | return err; | |
223 | } | |
224 | } | |
225 | out: | |
226 | if (!partial) | |
227 | SetPageUptodate(page); | |
228 | return 0; | |
229 | } | |
230 | ||
748de673 AF |
231 | /** |
232 | * move_extent_per_page - Move extent data per page | |
233 | * | |
234 | * @o_filp: file structure of original file | |
235 | * @donor_inode: donor inode | |
236 | * @orig_page_offset: page index on original file | |
65dd8327 | 237 | * @donor_page_offset: page index on donor file |
748de673 AF |
238 | * @data_offset_in_page: block index where data swapping starts |
239 | * @block_len_in_page: the number of blocks to be swapped | |
556615dc | 240 | * @unwritten: orig extent is unwritten or not |
f868a48d | 241 | * @err: pointer to save return value |
748de673 AF |
242 | * |
243 | * Save the data in original inode blocks and replace original inode extents | |
65dd8327 | 244 | * with donor inode extents by calling ext4_swap_extents(). |
f868a48d AF |
245 | * Finally, write out the saved data in new original inode blocks. Return |
246 | * replaced block count. | |
748de673 AF |
247 | */ |
248 | static int | |
44fc48f7 | 249 | move_extent_per_page(struct file *o_filp, struct inode *donor_inode, |
fcf6b1b7 DM |
250 | pgoff_t orig_page_offset, pgoff_t donor_page_offset, |
251 | int data_offset_in_page, | |
252 | int block_len_in_page, int unwritten, int *err) | |
748de673 | 253 | { |
496ad9aa | 254 | struct inode *orig_inode = file_inode(o_filp); |
bb557488 | 255 | struct page *pagep[2] = {NULL, NULL}; |
748de673 | 256 | handle_t *handle; |
fcf6b1b7 | 257 | ext4_lblk_t orig_blk_offset, donor_blk_offset; |
748de673 | 258 | unsigned long blocksize = orig_inode->i_sb->s_blocksize; |
f868a48d | 259 | unsigned int tmp_data_size, data_size, replaced_size; |
bcff2488 | 260 | int i, err2, jblocks, retries = 0; |
f868a48d | 261 | int replaced_count = 0; |
bb557488 | 262 | int from = data_offset_in_page << orig_inode->i_blkbits; |
09cbfeaf | 263 | int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits; |
88c6b61f | 264 | struct super_block *sb = orig_inode->i_sb; |
bcff2488 | 265 | struct buffer_head *bh = NULL; |
748de673 AF |
266 | |
267 | /* | |
268 | * It needs twice the amount of ordinary journal buffers because | |
269 | * inode and donor_inode may change each different metadata blocks. | |
270 | */ | |
bb557488 DM |
271 | again: |
272 | *err = 0; | |
748de673 | 273 | jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; |
9924a92a | 274 | handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks); |
748de673 | 275 | if (IS_ERR(handle)) { |
f868a48d AF |
276 | *err = PTR_ERR(handle); |
277 | return 0; | |
748de673 AF |
278 | } |
279 | ||
748de673 AF |
280 | orig_blk_offset = orig_page_offset * blocks_per_page + |
281 | data_offset_in_page; | |
282 | ||
fcf6b1b7 DM |
283 | donor_blk_offset = donor_page_offset * blocks_per_page + |
284 | data_offset_in_page; | |
285 | ||
f868a48d | 286 | /* Calculate data_size */ |
748de673 AF |
287 | if ((orig_blk_offset + block_len_in_page - 1) == |
288 | ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { | |
289 | /* Replace the last block */ | |
f868a48d | 290 | tmp_data_size = orig_inode->i_size & (blocksize - 1); |
748de673 | 291 | /* |
f868a48d | 292 | * If data_size equal zero, it shows data_size is multiples of |
748de673 AF |
293 | * blocksize. So we set appropriate value. |
294 | */ | |
f868a48d AF |
295 | if (tmp_data_size == 0) |
296 | tmp_data_size = blocksize; | |
748de673 | 297 | |
f868a48d | 298 | data_size = tmp_data_size + |
748de673 | 299 | ((block_len_in_page - 1) << orig_inode->i_blkbits); |
f868a48d AF |
300 | } else |
301 | data_size = block_len_in_page << orig_inode->i_blkbits; | |
302 | ||
303 | replaced_size = data_size; | |
748de673 | 304 | |
bb557488 | 305 | *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset, |
fcf6b1b7 | 306 | donor_page_offset, pagep); |
f868a48d | 307 | if (unlikely(*err < 0)) |
bb557488 | 308 | goto stop_journal; |
8c854473 | 309 | /* |
556615dc | 310 | * If orig extent was unwritten it can become initialized |
8c854473 DM |
311 | * at any time after i_data_sem was dropped, in order to |
312 | * serialize with delalloc we have recheck extent while we | |
313 | * hold page's lock, if it is still the case data copy is not | |
314 | * necessary, just swap data blocks between orig and donor. | |
315 | */ | |
556615dc | 316 | if (unwritten) { |
393d1d1d | 317 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
8c854473 DM |
318 | /* If any of extents in range became initialized we have to |
319 | * fallback to data copying */ | |
556615dc LC |
320 | unwritten = mext_check_coverage(orig_inode, orig_blk_offset, |
321 | block_len_in_page, 1, err); | |
8c854473 DM |
322 | if (*err) |
323 | goto drop_data_sem; | |
748de673 | 324 | |
fcf6b1b7 | 325 | unwritten &= mext_check_coverage(donor_inode, donor_blk_offset, |
556615dc | 326 | block_len_in_page, 1, err); |
8c854473 DM |
327 | if (*err) |
328 | goto drop_data_sem; | |
329 | ||
556615dc | 330 | if (!unwritten) { |
393d1d1d | 331 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
8c854473 DM |
332 | goto data_copy; |
333 | } | |
334 | if ((page_has_private(pagep[0]) && | |
335 | !try_to_release_page(pagep[0], 0)) || | |
336 | (page_has_private(pagep[1]) && | |
337 | !try_to_release_page(pagep[1], 0))) { | |
338 | *err = -EBUSY; | |
339 | goto drop_data_sem; | |
340 | } | |
fcf6b1b7 DM |
341 | replaced_count = ext4_swap_extents(handle, orig_inode, |
342 | donor_inode, orig_blk_offset, | |
343 | donor_blk_offset, | |
344 | block_len_in_page, 1, err); | |
8c854473 | 345 | drop_data_sem: |
393d1d1d | 346 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
8c854473 DM |
347 | goto unlock_pages; |
348 | } | |
349 | data_copy: | |
bb557488 DM |
350 | *err = mext_page_mkuptodate(pagep[0], from, from + replaced_size); |
351 | if (*err) | |
352 | goto unlock_pages; | |
353 | ||
354 | /* At this point all buffers in range are uptodate, old mapping layout | |
355 | * is no longer required, try to drop it now. */ | |
356 | if ((page_has_private(pagep[0]) && !try_to_release_page(pagep[0], 0)) || | |
357 | (page_has_private(pagep[1]) && !try_to_release_page(pagep[1], 0))) { | |
358 | *err = -EBUSY; | |
359 | goto unlock_pages; | |
748de673 | 360 | } |
6e263146 | 361 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
fcf6b1b7 DM |
362 | replaced_count = ext4_swap_extents(handle, orig_inode, donor_inode, |
363 | orig_blk_offset, donor_blk_offset, | |
364 | block_len_in_page, 1, err); | |
6e263146 | 365 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
bb557488 | 366 | if (*err) { |
f868a48d AF |
367 | if (replaced_count) { |
368 | block_len_in_page = replaced_count; | |
369 | replaced_size = | |
370 | block_len_in_page << orig_inode->i_blkbits; | |
ac48b0a1 | 371 | } else |
bb557488 | 372 | goto unlock_pages; |
748de673 | 373 | } |
bb557488 DM |
374 | /* Perform all necessary steps similar write_begin()/write_end() |
375 | * but keeping in mind that i_size will not change */ | |
bcff2488 EG |
376 | if (!page_has_buffers(pagep[0])) |
377 | create_empty_buffers(pagep[0], 1 << orig_inode->i_blkbits, 0); | |
378 | bh = page_buffers(pagep[0]); | |
379 | for (i = 0; i < data_offset_in_page; i++) | |
380 | bh = bh->b_this_page; | |
381 | for (i = 0; i < block_len_in_page; i++) { | |
382 | *err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0); | |
383 | if (*err < 0) | |
384 | break; | |
6ffe77ba | 385 | bh = bh->b_this_page; |
bcff2488 | 386 | } |
bb557488 DM |
387 | if (!*err) |
388 | *err = block_commit_write(pagep[0], from, from + replaced_size); | |
748de673 | 389 | |
bb557488 DM |
390 | if (unlikely(*err < 0)) |
391 | goto repair_branches; | |
392 | ||
393 | /* Even in case of data=writeback it is reasonable to pin | |
394 | * inode to transaction, to prevent unexpected data loss */ | |
ee0876bc | 395 | *err = ext4_jbd2_inode_add_write(handle, orig_inode); |
bb557488 DM |
396 | |
397 | unlock_pages: | |
398 | unlock_page(pagep[0]); | |
09cbfeaf | 399 | put_page(pagep[0]); |
bb557488 | 400 | unlock_page(pagep[1]); |
09cbfeaf | 401 | put_page(pagep[1]); |
bb557488 | 402 | stop_journal: |
748de673 | 403 | ext4_journal_stop(handle); |
88c6b61f DM |
404 | if (*err == -ENOSPC && |
405 | ext4_should_retry_alloc(sb, &retries)) | |
406 | goto again; | |
bb557488 DM |
407 | /* Buffer was busy because probably is pinned to journal transaction, |
408 | * force transaction commit may help to free it. */ | |
88c6b61f DM |
409 | if (*err == -EBUSY && retries++ < 4 && EXT4_SB(sb)->s_journal && |
410 | jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal)) | |
bb557488 | 411 | goto again; |
f868a48d | 412 | return replaced_count; |
bb557488 DM |
413 | |
414 | repair_branches: | |
415 | /* | |
416 | * This should never ever happen! | |
417 | * Extents are swapped already, but we are not able to copy data. | |
418 | * Try to swap extents to it's original places | |
419 | */ | |
393d1d1d | 420 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
fcf6b1b7 DM |
421 | replaced_count = ext4_swap_extents(handle, donor_inode, orig_inode, |
422 | orig_blk_offset, donor_blk_offset, | |
423 | block_len_in_page, 0, &err2); | |
393d1d1d | 424 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
bb557488 DM |
425 | if (replaced_count != block_len_in_page) { |
426 | EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset), | |
427 | "Unable to copy data block," | |
428 | " data will be lost."); | |
429 | *err = -EIO; | |
430 | } | |
431 | replaced_count = 0; | |
432 | goto unlock_pages; | |
748de673 AF |
433 | } |
434 | ||
435 | /** | |
c437b273 | 436 | * mext_check_arguments - Check whether move extent can be done |
748de673 AF |
437 | * |
438 | * @orig_inode: original inode | |
439 | * @donor_inode: donor inode | |
440 | * @orig_start: logical start offset in block for orig | |
441 | * @donor_start: logical start offset in block for donor | |
442 | * @len: the number of blocks to be moved | |
748de673 AF |
443 | * |
444 | * Check the arguments of ext4_move_extents() whether the files can be | |
445 | * exchanged with each other. | |
446 | * Return 0 on success, or a negative error value on failure. | |
447 | */ | |
448 | static int | |
449 | mext_check_arguments(struct inode *orig_inode, | |
446aaa6e KM |
450 | struct inode *donor_inode, __u64 orig_start, |
451 | __u64 donor_start, __u64 *len) | |
748de673 | 452 | { |
fcf6b1b7 | 453 | __u64 orig_eof, donor_eof; |
70d5d3dc AF |
454 | unsigned int blkbits = orig_inode->i_blkbits; |
455 | unsigned int blocksize = 1 << blkbits; | |
456 | ||
fcf6b1b7 DM |
457 | orig_eof = (i_size_read(orig_inode) + blocksize - 1) >> blkbits; |
458 | donor_eof = (i_size_read(donor_inode) + blocksize - 1) >> blkbits; | |
459 | ||
460 | ||
4a58579b AF |
461 | if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { |
462 | ext4_debug("ext4 move extent: suid or sgid is set" | |
463 | " to donor file [ino:orig %lu, donor %lu]\n", | |
464 | orig_inode->i_ino, donor_inode->i_ino); | |
465 | return -EINVAL; | |
466 | } | |
467 | ||
1f5a81e4 TT |
468 | if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) |
469 | return -EPERM; | |
470 | ||
748de673 AF |
471 | /* Ext4 move extent does not support swapfile */ |
472 | if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { | |
473 | ext4_debug("ext4 move extent: The argument files should " | |
474 | "not be swapfile [ino:orig %lu, donor %lu]\n", | |
475 | orig_inode->i_ino, donor_inode->i_ino); | |
fcf6b1b7 | 476 | return -EBUSY; |
748de673 AF |
477 | } |
478 | ||
02749a4c | 479 | if (ext4_is_quota_file(orig_inode) && ext4_is_quota_file(donor_inode)) { |
daf647d2 TT |
480 | ext4_debug("ext4 move extent: The argument files should " |
481 | "not be quota files [ino:orig %lu, donor %lu]\n", | |
482 | orig_inode->i_ino, donor_inode->i_ino); | |
483 | return -EBUSY; | |
484 | } | |
485 | ||
748de673 | 486 | /* Ext4 move extent supports only extent based file */ |
12e9b892 | 487 | if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) { |
748de673 AF |
488 | ext4_debug("ext4 move extent: orig file is not extents " |
489 | "based file [ino:orig %lu]\n", orig_inode->i_ino); | |
490 | return -EOPNOTSUPP; | |
12e9b892 | 491 | } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) { |
748de673 AF |
492 | ext4_debug("ext4 move extent: donor file is not extents " |
493 | "based file [ino:donor %lu]\n", donor_inode->i_ino); | |
494 | return -EOPNOTSUPP; | |
495 | } | |
496 | ||
497 | if ((!orig_inode->i_size) || (!donor_inode->i_size)) { | |
498 | ext4_debug("ext4 move extent: File size is 0 byte\n"); | |
499 | return -EINVAL; | |
500 | } | |
501 | ||
502 | /* Start offset should be same */ | |
fcf6b1b7 DM |
503 | if ((orig_start & ~(PAGE_MASK >> orig_inode->i_blkbits)) != |
504 | (donor_start & ~(PAGE_MASK >> orig_inode->i_blkbits))) { | |
748de673 | 505 | ext4_debug("ext4 move extent: orig and donor's start " |
d67d64f4 | 506 | "offsets are not aligned [ino:orig %lu, donor %lu]\n", |
748de673 AF |
507 | orig_inode->i_ino, donor_inode->i_ino); |
508 | return -EINVAL; | |
509 | } | |
510 | ||
f17722f9 | 511 | if ((orig_start >= EXT_MAX_BLOCKS) || |
fcf6b1b7 | 512 | (donor_start >= EXT_MAX_BLOCKS) || |
f17722f9 | 513 | (*len > EXT_MAX_BLOCKS) || |
fcf6b1b7 | 514 | (donor_start + *len >= EXT_MAX_BLOCKS) || |
f17722f9 | 515 | (orig_start + *len >= EXT_MAX_BLOCKS)) { |
0a80e986 | 516 | ext4_debug("ext4 move extent: Can't handle over [%u] blocks " |
f17722f9 | 517 | "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, |
748de673 AF |
518 | orig_inode->i_ino, donor_inode->i_ino); |
519 | return -EINVAL; | |
520 | } | |
fcf6b1b7 DM |
521 | if (orig_eof < orig_start + *len - 1) |
522 | *len = orig_eof - orig_start; | |
523 | if (donor_eof < donor_start + *len - 1) | |
524 | *len = donor_eof - donor_start; | |
748de673 | 525 | if (!*len) { |
92c28159 | 526 | ext4_debug("ext4 move extent: len should not be 0 " |
748de673 AF |
527 | "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, |
528 | donor_inode->i_ino); | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
748de673 AF |
535 | /** |
536 | * ext4_move_extents - Exchange the specified range of a file | |
537 | * | |
538 | * @o_filp: file structure of the original file | |
539 | * @d_filp: file structure of the donor file | |
65dd8327 XW |
540 | * @orig_blk: start offset in block for orig |
541 | * @donor_blk: start offset in block for donor | |
748de673 AF |
542 | * @len: the number of blocks to be moved |
543 | * @moved_len: moved block length | |
544 | * | |
545 | * This function returns 0 and moved block length is set in moved_len | |
546 | * if succeed, otherwise returns error value. | |
547 | * | |
748de673 AF |
548 | */ |
549 | int | |
fcf6b1b7 DM |
550 | ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk, |
551 | __u64 donor_blk, __u64 len, __u64 *moved_len) | |
748de673 | 552 | { |
496ad9aa AV |
553 | struct inode *orig_inode = file_inode(o_filp); |
554 | struct inode *donor_inode = file_inode(d_filp); | |
fcf6b1b7 | 555 | struct ext4_ext_path *path = NULL; |
09cbfeaf | 556 | int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits; |
fcf6b1b7 DM |
557 | ext4_lblk_t o_end, o_start = orig_blk; |
558 | ext4_lblk_t d_start = donor_blk; | |
559 | int ret; | |
748de673 | 560 | |
03bd8b9b DM |
561 | if (orig_inode->i_sb != donor_inode->i_sb) { |
562 | ext4_debug("ext4 move extent: The argument files " | |
563 | "should be in same FS [ino:orig %lu, donor %lu]\n", | |
564 | orig_inode->i_ino, donor_inode->i_ino); | |
565 | return -EINVAL; | |
566 | } | |
567 | ||
568 | /* orig and donor should be different inodes */ | |
569 | if (orig_inode == donor_inode) { | |
f3ce8064 | 570 | ext4_debug("ext4 move extent: The argument files should not " |
03bd8b9b | 571 | "be same inode [ino:orig %lu, donor %lu]\n", |
f3ce8064 TT |
572 | orig_inode->i_ino, donor_inode->i_ino); |
573 | return -EINVAL; | |
574 | } | |
575 | ||
7247c0ca AF |
576 | /* Regular file check */ |
577 | if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { | |
578 | ext4_debug("ext4 move extent: The argument files should be " | |
579 | "regular file [ino:orig %lu, donor %lu]\n", | |
580 | orig_inode->i_ino, donor_inode->i_ino); | |
581 | return -EINVAL; | |
582 | } | |
04e22412 EW |
583 | |
584 | /* TODO: it's not obvious how to swap blocks for inodes with full | |
585 | journaling enabled */ | |
f066055a DM |
586 | if (ext4_should_journal_data(orig_inode) || |
587 | ext4_should_journal_data(donor_inode)) { | |
04e22412 EW |
588 | ext4_msg(orig_inode->i_sb, KERN_ERR, |
589 | "Online defrag not supported with data journaling"); | |
590 | return -EOPNOTSUPP; | |
f066055a | 591 | } |
04e22412 | 592 | |
14fbd4aa EW |
593 | if (ext4_encrypted_inode(orig_inode) || |
594 | ext4_encrypted_inode(donor_inode)) { | |
595 | ext4_msg(orig_inode->i_sb, KERN_ERR, | |
596 | "Online defrag not supported for encrypted files"); | |
597 | return -EOPNOTSUPP; | |
598 | } | |
599 | ||
fc04cb49 | 600 | /* Protect orig and donor inodes against a truncate */ |
375e289e | 601 | lock_two_nondirectories(orig_inode, donor_inode); |
748de673 | 602 | |
17335dcc | 603 | /* Wait for all existing dio workers */ |
17335dcc DM |
604 | inode_dio_wait(orig_inode); |
605 | inode_dio_wait(donor_inode); | |
606 | ||
fc04cb49 | 607 | /* Protect extent tree against block allocations via delalloc */ |
393d1d1d | 608 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
748de673 | 609 | /* Check the filesystem environment whether move_extent can be done */ |
fcf6b1b7 DM |
610 | ret = mext_check_arguments(orig_inode, donor_inode, orig_blk, |
611 | donor_blk, &len); | |
03bd8b9b | 612 | if (ret) |
347fa6f1 | 613 | goto out; |
fcf6b1b7 | 614 | o_end = o_start + len; |
748de673 | 615 | |
fcf6b1b7 DM |
616 | while (o_start < o_end) { |
617 | struct ext4_extent *ex; | |
618 | ext4_lblk_t cur_blk, next_blk; | |
619 | pgoff_t orig_page_index, donor_page_index; | |
620 | int offset_in_page; | |
621 | int unwritten, cur_len; | |
748de673 | 622 | |
fcf6b1b7 DM |
623 | ret = get_ext_path(orig_inode, o_start, &path); |
624 | if (ret) | |
748de673 | 625 | goto out; |
fcf6b1b7 DM |
626 | ex = path[path->p_depth].p_ext; |
627 | next_blk = ext4_ext_next_allocated_block(path); | |
628 | cur_blk = le32_to_cpu(ex->ee_block); | |
629 | cur_len = ext4_ext_get_actual_len(ex); | |
630 | /* Check hole before the start pos */ | |
631 | if (cur_blk + cur_len - 1 < o_start) { | |
632 | if (next_blk == EXT_MAX_BLOCKS) { | |
633 | o_start = o_end; | |
634 | ret = -ENODATA; | |
635 | goto out; | |
636 | } | |
637 | d_start += next_blk - o_start; | |
638 | o_start = next_blk; | |
3bdf14b4 | 639 | continue; |
fcf6b1b7 DM |
640 | /* Check hole after the start pos */ |
641 | } else if (cur_blk > o_start) { | |
642 | /* Skip hole */ | |
643 | d_start += cur_blk - o_start; | |
644 | o_start = cur_blk; | |
645 | /* Extent inside requested range ?*/ | |
646 | if (cur_blk >= o_end) | |
647 | goto out; | |
648 | } else { /* in_range(o_start, o_blk, o_len) */ | |
649 | cur_len += cur_blk - o_start; | |
748de673 | 650 | } |
fcf6b1b7 DM |
651 | unwritten = ext4_ext_is_unwritten(ex); |
652 | if (o_end - o_start < cur_len) | |
653 | cur_len = o_end - o_start; | |
654 | ||
09cbfeaf | 655 | orig_page_index = o_start >> (PAGE_SHIFT - |
fcf6b1b7 | 656 | orig_inode->i_blkbits); |
09cbfeaf | 657 | donor_page_index = d_start >> (PAGE_SHIFT - |
fcf6b1b7 DM |
658 | donor_inode->i_blkbits); |
659 | offset_in_page = o_start % blocks_per_page; | |
660 | if (cur_len > blocks_per_page- offset_in_page) | |
661 | cur_len = blocks_per_page - offset_in_page; | |
fc04cb49 AF |
662 | /* |
663 | * Up semaphore to avoid following problems: | |
664 | * a. transaction deadlock among ext4_journal_start, | |
665 | * ->write_begin via pagefault, and jbd2_journal_commit | |
666 | * b. racing with ->readpage, ->write_begin, and ext4_get_block | |
667 | * in move_extent_per_page | |
668 | */ | |
393d1d1d | 669 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
fcf6b1b7 DM |
670 | /* Swap original branches with new branches */ |
671 | move_extent_per_page(o_filp, donor_inode, | |
672 | orig_page_index, donor_page_index, | |
673 | offset_in_page, cur_len, | |
674 | unwritten, &ret); | |
393d1d1d | 675 | ext4_double_down_write_data_sem(orig_inode, donor_inode); |
03bd8b9b | 676 | if (ret < 0) |
fc04cb49 | 677 | break; |
fcf6b1b7 DM |
678 | o_start += cur_len; |
679 | d_start += cur_len; | |
748de673 | 680 | } |
fcf6b1b7 DM |
681 | *moved_len = o_start - orig_blk; |
682 | if (*moved_len > len) | |
683 | *moved_len = len; | |
684 | ||
748de673 | 685 | out: |
94d7c16c AF |
686 | if (*moved_len) { |
687 | ext4_discard_preallocations(orig_inode); | |
688 | ext4_discard_preallocations(donor_inode); | |
689 | } | |
690 | ||
b7ea89ad TT |
691 | ext4_ext_drop_refs(path); |
692 | kfree(path); | |
393d1d1d | 693 | ext4_double_up_write_data_sem(orig_inode, donor_inode); |
375e289e | 694 | unlock_two_nondirectories(orig_inode, donor_inode); |
748de673 | 695 | |
03bd8b9b | 696 | return ret; |
748de673 | 697 | } |