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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 | * | |
30 | * ext4_ext_find_extent wrapper. Return 0 on success, or a negative error value | |
31 | * on failure. | |
32 | */ | |
33 | static inline int | |
34 | get_ext_path(struct inode *inode, ext4_lblk_t lblock, | |
0e401101 | 35 | struct ext4_ext_path **orig_path) |
e8505970 AF |
36 | { |
37 | int ret = 0; | |
0e401101 | 38 | struct ext4_ext_path *path; |
e8505970 | 39 | |
0e401101 DM |
40 | path = ext4_ext_find_extent(inode, lblock, *orig_path); |
41 | if (IS_ERR(path)) | |
42 | ret = PTR_ERR(path); | |
43 | else if (path[ext_depth(inode)].p_ext == NULL) | |
347fa6f1 | 44 | ret = -ENODATA; |
0e401101 DM |
45 | else |
46 | *orig_path = path; | |
347fa6f1 | 47 | |
e8505970 AF |
48 | return ret; |
49 | } | |
748de673 AF |
50 | |
51 | /** | |
52 | * copy_extent_status - Copy the extent's initialization status | |
53 | * | |
54 | * @src: an extent for getting initialize status | |
55 | * @dest: an extent to be set the status | |
56 | */ | |
57 | static void | |
58 | copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest) | |
59 | { | |
60 | if (ext4_ext_is_uninitialized(src)) | |
61 | ext4_ext_mark_uninitialized(dest); | |
62 | else | |
63 | dest->ee_len = cpu_to_le16(ext4_ext_get_actual_len(dest)); | |
64 | } | |
65 | ||
66 | /** | |
67 | * mext_next_extent - Search for the next extent and set it to "extent" | |
68 | * | |
69 | * @inode: inode which is searched | |
70 | * @path: this will obtain data for the next extent | |
71 | * @extent: pointer to the next extent we have just gotten | |
72 | * | |
73 | * Search the next extent in the array of ext4_ext_path structure (@path) | |
74 | * and set it to ext4_extent structure (@extent). In addition, the member of | |
75 | * @path (->p_ext) also points the next extent. Return 0 on success, 1 if | |
76 | * ext4_ext_path structure refers to the last extent, or a negative error | |
77 | * value on failure. | |
78 | */ | |
79 | static int | |
80 | mext_next_extent(struct inode *inode, struct ext4_ext_path *path, | |
81 | struct ext4_extent **extent) | |
82 | { | |
fc04cb49 | 83 | struct ext4_extent_header *eh; |
748de673 AF |
84 | int ppos, leaf_ppos = path->p_depth; |
85 | ||
86 | ppos = leaf_ppos; | |
87 | if (EXT_LAST_EXTENT(path[ppos].p_hdr) > path[ppos].p_ext) { | |
88 | /* leaf block */ | |
89 | *extent = ++path[ppos].p_ext; | |
bf89d16f | 90 | path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); |
748de673 AF |
91 | return 0; |
92 | } | |
93 | ||
94 | while (--ppos >= 0) { | |
95 | if (EXT_LAST_INDEX(path[ppos].p_hdr) > | |
96 | path[ppos].p_idx) { | |
97 | int cur_ppos = ppos; | |
98 | ||
99 | /* index block */ | |
100 | path[ppos].p_idx++; | |
bf89d16f | 101 | path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx); |
748de673 AF |
102 | if (path[ppos+1].p_bh) |
103 | brelse(path[ppos+1].p_bh); | |
104 | path[ppos+1].p_bh = | |
105 | sb_bread(inode->i_sb, path[ppos].p_block); | |
106 | if (!path[ppos+1].p_bh) | |
107 | return -EIO; | |
108 | path[ppos+1].p_hdr = | |
109 | ext_block_hdr(path[ppos+1].p_bh); | |
110 | ||
111 | /* Halfway index block */ | |
112 | while (++cur_ppos < leaf_ppos) { | |
113 | path[cur_ppos].p_idx = | |
114 | EXT_FIRST_INDEX(path[cur_ppos].p_hdr); | |
115 | path[cur_ppos].p_block = | |
bf89d16f | 116 | ext4_idx_pblock(path[cur_ppos].p_idx); |
748de673 AF |
117 | if (path[cur_ppos+1].p_bh) |
118 | brelse(path[cur_ppos+1].p_bh); | |
119 | path[cur_ppos+1].p_bh = sb_bread(inode->i_sb, | |
120 | path[cur_ppos].p_block); | |
121 | if (!path[cur_ppos+1].p_bh) | |
122 | return -EIO; | |
123 | path[cur_ppos+1].p_hdr = | |
124 | ext_block_hdr(path[cur_ppos+1].p_bh); | |
125 | } | |
126 | ||
fc04cb49 AF |
127 | path[leaf_ppos].p_ext = *extent = NULL; |
128 | ||
129 | eh = path[leaf_ppos].p_hdr; | |
130 | if (le16_to_cpu(eh->eh_entries) == 0) | |
131 | /* empty leaf is found */ | |
132 | return -ENODATA; | |
133 | ||
748de673 AF |
134 | /* leaf block */ |
135 | path[leaf_ppos].p_ext = *extent = | |
136 | EXT_FIRST_EXTENT(path[leaf_ppos].p_hdr); | |
fc04cb49 | 137 | path[leaf_ppos].p_block = |
bf89d16f | 138 | ext4_ext_pblock(path[leaf_ppos].p_ext); |
748de673 AF |
139 | return 0; |
140 | } | |
141 | } | |
142 | /* We found the last extent */ | |
143 | return 1; | |
144 | } | |
145 | ||
146 | /** | |
fc04cb49 | 147 | * double_down_write_data_sem - Acquire two inodes' write lock of i_data_sem |
748de673 | 148 | * |
03bd8b9b | 149 | * Acquire write lock of i_data_sem of the two inodes |
748de673 AF |
150 | */ |
151 | static void | |
03bd8b9b | 152 | double_down_write_data_sem(struct inode *first, struct inode *second) |
748de673 | 153 | { |
03bd8b9b DM |
154 | if (first < second) { |
155 | down_write(&EXT4_I(first)->i_data_sem); | |
156 | down_write_nested(&EXT4_I(second)->i_data_sem, SINGLE_DEPTH_NESTING); | |
157 | } else { | |
158 | down_write(&EXT4_I(second)->i_data_sem); | |
159 | down_write_nested(&EXT4_I(first)->i_data_sem, SINGLE_DEPTH_NESTING); | |
748de673 | 160 | |
748de673 | 161 | } |
748de673 AF |
162 | } |
163 | ||
164 | /** | |
fc04cb49 | 165 | * double_up_write_data_sem - Release two inodes' write lock of i_data_sem |
748de673 AF |
166 | * |
167 | * @orig_inode: original inode structure to be released its lock first | |
168 | * @donor_inode: donor inode structure to be released its lock second | |
fc04cb49 | 169 | * Release write lock of i_data_sem of two inodes (orig and donor). |
748de673 AF |
170 | */ |
171 | static void | |
fc04cb49 | 172 | double_up_write_data_sem(struct inode *orig_inode, struct inode *donor_inode) |
748de673 | 173 | { |
748de673 AF |
174 | up_write(&EXT4_I(orig_inode)->i_data_sem); |
175 | up_write(&EXT4_I(donor_inode)->i_data_sem); | |
176 | } | |
177 | ||
178 | /** | |
179 | * mext_insert_across_blocks - Insert extents across leaf block | |
180 | * | |
181 | * @handle: journal handle | |
182 | * @orig_inode: original inode | |
183 | * @o_start: first original extent to be changed | |
184 | * @o_end: last original extent to be changed | |
185 | * @start_ext: first new extent to be inserted | |
186 | * @new_ext: middle of new extent to be inserted | |
187 | * @end_ext: last new extent to be inserted | |
188 | * | |
189 | * Allocate a new leaf block and insert extents into it. Return 0 on success, | |
190 | * or a negative error value on failure. | |
191 | */ | |
192 | static int | |
193 | mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, | |
194 | struct ext4_extent *o_start, struct ext4_extent *o_end, | |
195 | struct ext4_extent *start_ext, struct ext4_extent *new_ext, | |
196 | struct ext4_extent *end_ext) | |
197 | { | |
198 | struct ext4_ext_path *orig_path = NULL; | |
199 | ext4_lblk_t eblock = 0; | |
200 | int new_flag = 0; | |
201 | int end_flag = 0; | |
202 | int err = 0; | |
203 | ||
204 | if (start_ext->ee_len && new_ext->ee_len && end_ext->ee_len) { | |
205 | if (o_start == o_end) { | |
206 | ||
207 | /* start_ext new_ext end_ext | |
208 | * donor |---------|-----------|--------| | |
209 | * orig |------------------------------| | |
210 | */ | |
211 | end_flag = 1; | |
212 | } else { | |
213 | ||
214 | /* start_ext new_ext end_ext | |
215 | * donor |---------|----------|---------| | |
216 | * orig |---------------|--------------| | |
217 | */ | |
218 | o_end->ee_block = end_ext->ee_block; | |
219 | o_end->ee_len = end_ext->ee_len; | |
bf89d16f | 220 | ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext)); |
748de673 AF |
221 | } |
222 | ||
223 | o_start->ee_len = start_ext->ee_len; | |
5fd5249a | 224 | eblock = le32_to_cpu(start_ext->ee_block); |
748de673 AF |
225 | new_flag = 1; |
226 | ||
227 | } else if (start_ext->ee_len && new_ext->ee_len && | |
228 | !end_ext->ee_len && o_start == o_end) { | |
229 | ||
230 | /* start_ext new_ext | |
231 | * donor |--------------|---------------| | |
232 | * orig |------------------------------| | |
233 | */ | |
234 | o_start->ee_len = start_ext->ee_len; | |
5fd5249a | 235 | eblock = le32_to_cpu(start_ext->ee_block); |
748de673 AF |
236 | new_flag = 1; |
237 | ||
238 | } else if (!start_ext->ee_len && new_ext->ee_len && | |
239 | end_ext->ee_len && o_start == o_end) { | |
240 | ||
241 | /* new_ext end_ext | |
242 | * donor |--------------|---------------| | |
243 | * orig |------------------------------| | |
244 | */ | |
245 | o_end->ee_block = end_ext->ee_block; | |
246 | o_end->ee_len = end_ext->ee_len; | |
bf89d16f | 247 | ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext)); |
748de673 AF |
248 | |
249 | /* | |
250 | * Set 0 to the extent block if new_ext was | |
251 | * the first block. | |
252 | */ | |
253 | if (new_ext->ee_block) | |
254 | eblock = le32_to_cpu(new_ext->ee_block); | |
255 | ||
256 | new_flag = 1; | |
257 | } else { | |
258 | ext4_debug("ext4 move extent: Unexpected insert case\n"); | |
259 | return -EIO; | |
260 | } | |
261 | ||
262 | if (new_flag) { | |
e8505970 | 263 | err = get_ext_path(orig_inode, eblock, &orig_path); |
347fa6f1 | 264 | if (err) |
748de673 AF |
265 | goto out; |
266 | ||
267 | if (ext4_ext_insert_extent(handle, orig_inode, | |
0031462b | 268 | orig_path, new_ext, 0)) |
748de673 AF |
269 | goto out; |
270 | } | |
271 | ||
272 | if (end_flag) { | |
e8505970 AF |
273 | err = get_ext_path(orig_inode, |
274 | le32_to_cpu(end_ext->ee_block) - 1, &orig_path); | |
347fa6f1 | 275 | if (err) |
748de673 AF |
276 | goto out; |
277 | ||
278 | if (ext4_ext_insert_extent(handle, orig_inode, | |
0031462b | 279 | orig_path, end_ext, 0)) |
748de673 AF |
280 | goto out; |
281 | } | |
282 | out: | |
283 | if (orig_path) { | |
284 | ext4_ext_drop_refs(orig_path); | |
285 | kfree(orig_path); | |
286 | } | |
287 | ||
288 | return err; | |
289 | ||
290 | } | |
291 | ||
292 | /** | |
293 | * mext_insert_inside_block - Insert new extent to the extent block | |
294 | * | |
295 | * @o_start: first original extent to be moved | |
296 | * @o_end: last original extent to be moved | |
297 | * @start_ext: first new extent to be inserted | |
298 | * @new_ext: middle of new extent to be inserted | |
299 | * @end_ext: last new extent to be inserted | |
300 | * @eh: extent header of target leaf block | |
301 | * @range_to_move: used to decide how to insert extent | |
302 | * | |
303 | * Insert extents into the leaf block. The extent (@o_start) is overwritten | |
304 | * by inserted extents. | |
305 | */ | |
306 | static void | |
307 | mext_insert_inside_block(struct ext4_extent *o_start, | |
308 | struct ext4_extent *o_end, | |
309 | struct ext4_extent *start_ext, | |
310 | struct ext4_extent *new_ext, | |
311 | struct ext4_extent *end_ext, | |
312 | struct ext4_extent_header *eh, | |
313 | int range_to_move) | |
314 | { | |
315 | int i = 0; | |
316 | unsigned long len; | |
317 | ||
318 | /* Move the existing extents */ | |
319 | if (range_to_move && o_end < EXT_LAST_EXTENT(eh)) { | |
320 | len = (unsigned long)(EXT_LAST_EXTENT(eh) + 1) - | |
321 | (unsigned long)(o_end + 1); | |
322 | memmove(o_end + 1 + range_to_move, o_end + 1, len); | |
323 | } | |
324 | ||
325 | /* Insert start entry */ | |
326 | if (start_ext->ee_len) | |
327 | o_start[i++].ee_len = start_ext->ee_len; | |
328 | ||
329 | /* Insert new entry */ | |
330 | if (new_ext->ee_len) { | |
331 | o_start[i] = *new_ext; | |
bf89d16f | 332 | ext4_ext_store_pblock(&o_start[i++], ext4_ext_pblock(new_ext)); |
748de673 AF |
333 | } |
334 | ||
335 | /* Insert end entry */ | |
336 | if (end_ext->ee_len) | |
337 | o_start[i] = *end_ext; | |
338 | ||
339 | /* Increment the total entries counter on the extent block */ | |
340 | le16_add_cpu(&eh->eh_entries, range_to_move); | |
341 | } | |
342 | ||
343 | /** | |
344 | * mext_insert_extents - Insert new extent | |
345 | * | |
346 | * @handle: journal handle | |
347 | * @orig_inode: original inode | |
348 | * @orig_path: path indicates first extent to be changed | |
349 | * @o_start: first original extent to be changed | |
350 | * @o_end: last original extent to be changed | |
351 | * @start_ext: first new extent to be inserted | |
352 | * @new_ext: middle of new extent to be inserted | |
353 | * @end_ext: last new extent to be inserted | |
354 | * | |
355 | * Call the function to insert extents. If we cannot add more extents into | |
356 | * the leaf block, we call mext_insert_across_blocks() to create a | |
357 | * new leaf block. Otherwise call mext_insert_inside_block(). Return 0 | |
358 | * on success, or a negative error value on failure. | |
359 | */ | |
360 | static int | |
361 | mext_insert_extents(handle_t *handle, struct inode *orig_inode, | |
362 | struct ext4_ext_path *orig_path, | |
363 | struct ext4_extent *o_start, | |
364 | struct ext4_extent *o_end, | |
365 | struct ext4_extent *start_ext, | |
366 | struct ext4_extent *new_ext, | |
367 | struct ext4_extent *end_ext) | |
368 | { | |
369 | struct ext4_extent_header *eh; | |
370 | unsigned long need_slots, slots_range; | |
371 | int range_to_move, depth, ret; | |
372 | ||
373 | /* | |
374 | * The extents need to be inserted | |
375 | * start_extent + new_extent + end_extent. | |
376 | */ | |
377 | need_slots = (start_ext->ee_len ? 1 : 0) + (end_ext->ee_len ? 1 : 0) + | |
378 | (new_ext->ee_len ? 1 : 0); | |
379 | ||
380 | /* The number of slots between start and end */ | |
381 | slots_range = ((unsigned long)(o_end + 1) - (unsigned long)o_start + 1) | |
382 | / sizeof(struct ext4_extent); | |
383 | ||
384 | /* Range to move the end of extent */ | |
385 | range_to_move = need_slots - slots_range; | |
386 | depth = orig_path->p_depth; | |
387 | orig_path += depth; | |
388 | eh = orig_path->p_hdr; | |
389 | ||
390 | if (depth) { | |
391 | /* Register to journal */ | |
392 | ret = ext4_journal_get_write_access(handle, orig_path->p_bh); | |
393 | if (ret) | |
394 | return ret; | |
395 | } | |
396 | ||
397 | /* Expansion */ | |
398 | if (range_to_move > 0 && | |
399 | (range_to_move > le16_to_cpu(eh->eh_max) | |
400 | - le16_to_cpu(eh->eh_entries))) { | |
401 | ||
402 | ret = mext_insert_across_blocks(handle, orig_inode, o_start, | |
403 | o_end, start_ext, new_ext, end_ext); | |
404 | if (ret < 0) | |
405 | return ret; | |
406 | } else | |
407 | mext_insert_inside_block(o_start, o_end, start_ext, new_ext, | |
408 | end_ext, eh, range_to_move); | |
409 | ||
410 | if (depth) { | |
411 | ret = ext4_handle_dirty_metadata(handle, orig_inode, | |
412 | orig_path->p_bh); | |
413 | if (ret) | |
414 | return ret; | |
415 | } else { | |
416 | ret = ext4_mark_inode_dirty(handle, orig_inode); | |
417 | if (ret < 0) | |
418 | return ret; | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /** | |
425 | * mext_leaf_block - Move one leaf extent block into the inode. | |
426 | * | |
427 | * @handle: journal handle | |
428 | * @orig_inode: original inode | |
429 | * @orig_path: path indicates first extent to be changed | |
430 | * @dext: donor extent | |
431 | * @from: start offset on the target file | |
432 | * | |
433 | * In order to insert extents into the leaf block, we must divide the extent | |
434 | * in the leaf block into three extents. The one is located to be inserted | |
435 | * extents, and the others are located around it. | |
436 | * | |
437 | * Therefore, this function creates structures to save extents of the leaf | |
438 | * block, and inserts extents by calling mext_insert_extents() with | |
439 | * created extents. Return 0 on success, or a negative error value on failure. | |
440 | */ | |
441 | static int | |
442 | mext_leaf_block(handle_t *handle, struct inode *orig_inode, | |
443 | struct ext4_ext_path *orig_path, struct ext4_extent *dext, | |
444 | ext4_lblk_t *from) | |
445 | { | |
446 | struct ext4_extent *oext, *o_start, *o_end, *prev_ext; | |
447 | struct ext4_extent new_ext, start_ext, end_ext; | |
448 | ext4_lblk_t new_ext_end; | |
748de673 AF |
449 | int oext_alen, new_ext_alen, end_ext_alen; |
450 | int depth = ext_depth(orig_inode); | |
451 | int ret; | |
452 | ||
c26d0bad | 453 | start_ext.ee_block = end_ext.ee_block = 0; |
748de673 AF |
454 | o_start = o_end = oext = orig_path[depth].p_ext; |
455 | oext_alen = ext4_ext_get_actual_len(oext); | |
456 | start_ext.ee_len = end_ext.ee_len = 0; | |
457 | ||
458 | new_ext.ee_block = cpu_to_le32(*from); | |
bf89d16f | 459 | ext4_ext_store_pblock(&new_ext, ext4_ext_pblock(dext)); |
748de673 AF |
460 | new_ext.ee_len = dext->ee_len; |
461 | new_ext_alen = ext4_ext_get_actual_len(&new_ext); | |
462 | new_ext_end = le32_to_cpu(new_ext.ee_block) + new_ext_alen - 1; | |
748de673 AF |
463 | |
464 | /* | |
465 | * Case: original extent is first | |
466 | * oext |--------| | |
467 | * new_ext |--| | |
468 | * start_ext |--| | |
469 | */ | |
470 | if (le32_to_cpu(oext->ee_block) < le32_to_cpu(new_ext.ee_block) && | |
471 | le32_to_cpu(new_ext.ee_block) < | |
472 | le32_to_cpu(oext->ee_block) + oext_alen) { | |
473 | start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) - | |
474 | le32_to_cpu(oext->ee_block)); | |
5fd5249a | 475 | start_ext.ee_block = oext->ee_block; |
748de673 AF |
476 | copy_extent_status(oext, &start_ext); |
477 | } else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) { | |
478 | prev_ext = oext - 1; | |
479 | /* | |
480 | * We can merge new_ext into previous extent, | |
481 | * if these are contiguous and same extent type. | |
482 | */ | |
483 | if (ext4_can_extents_be_merged(orig_inode, prev_ext, | |
484 | &new_ext)) { | |
485 | o_start = prev_ext; | |
486 | start_ext.ee_len = cpu_to_le16( | |
487 | ext4_ext_get_actual_len(prev_ext) + | |
488 | new_ext_alen); | |
5fd5249a | 489 | start_ext.ee_block = oext->ee_block; |
748de673 AF |
490 | copy_extent_status(prev_ext, &start_ext); |
491 | new_ext.ee_len = 0; | |
492 | } | |
493 | } | |
494 | ||
495 | /* | |
496 | * Case: new_ext_end must be less than oext | |
497 | * oext |-----------| | |
498 | * new_ext |-------| | |
499 | */ | |
2147b1a6 | 500 | if (le32_to_cpu(oext->ee_block) + oext_alen - 1 < new_ext_end) { |
24676da4 | 501 | EXT4_ERROR_INODE(orig_inode, |
2147b1a6 AF |
502 | "new_ext_end(%u) should be less than or equal to " |
503 | "oext->ee_block(%u) + oext_alen(%d) - 1", | |
504 | new_ext_end, le32_to_cpu(oext->ee_block), | |
505 | oext_alen); | |
506 | ret = -EIO; | |
507 | goto out; | |
508 | } | |
748de673 AF |
509 | |
510 | /* | |
511 | * Case: new_ext is smaller than original extent | |
512 | * oext |---------------| | |
513 | * new_ext |-----------| | |
514 | * end_ext |---| | |
515 | */ | |
516 | if (le32_to_cpu(oext->ee_block) <= new_ext_end && | |
517 | new_ext_end < le32_to_cpu(oext->ee_block) + oext_alen - 1) { | |
518 | end_ext.ee_len = | |
519 | cpu_to_le16(le32_to_cpu(oext->ee_block) + | |
520 | oext_alen - 1 - new_ext_end); | |
521 | copy_extent_status(oext, &end_ext); | |
522 | end_ext_alen = ext4_ext_get_actual_len(&end_ext); | |
523 | ext4_ext_store_pblock(&end_ext, | |
bf89d16f | 524 | (ext4_ext_pblock(o_end) + oext_alen - end_ext_alen)); |
748de673 AF |
525 | end_ext.ee_block = |
526 | cpu_to_le32(le32_to_cpu(o_end->ee_block) + | |
527 | oext_alen - end_ext_alen); | |
528 | } | |
529 | ||
530 | ret = mext_insert_extents(handle, orig_inode, orig_path, o_start, | |
531 | o_end, &start_ext, &new_ext, &end_ext); | |
2147b1a6 | 532 | out: |
748de673 AF |
533 | return ret; |
534 | } | |
535 | ||
536 | /** | |
537 | * mext_calc_swap_extents - Calculate extents for extent swapping. | |
538 | * | |
539 | * @tmp_dext: the extent that will belong to the original inode | |
540 | * @tmp_oext: the extent that will belong to the donor inode | |
541 | * @orig_off: block offset of original inode | |
542 | * @donor_off: block offset of donor inode | |
92c28159 | 543 | * @max_count: the maximum length of extents |
c40ce3c9 AF |
544 | * |
545 | * Return 0 on success, or a negative error value on failure. | |
748de673 | 546 | */ |
c40ce3c9 | 547 | static int |
748de673 AF |
548 | mext_calc_swap_extents(struct ext4_extent *tmp_dext, |
549 | struct ext4_extent *tmp_oext, | |
550 | ext4_lblk_t orig_off, ext4_lblk_t donor_off, | |
551 | ext4_lblk_t max_count) | |
552 | { | |
553 | ext4_lblk_t diff, orig_diff; | |
554 | struct ext4_extent dext_old, oext_old; | |
555 | ||
c40ce3c9 AF |
556 | BUG_ON(orig_off != donor_off); |
557 | ||
558 | /* original and donor extents have to cover the same block offset */ | |
559 | if (orig_off < le32_to_cpu(tmp_oext->ee_block) || | |
560 | le32_to_cpu(tmp_oext->ee_block) + | |
561 | ext4_ext_get_actual_len(tmp_oext) - 1 < orig_off) | |
562 | return -ENODATA; | |
563 | ||
564 | if (orig_off < le32_to_cpu(tmp_dext->ee_block) || | |
565 | le32_to_cpu(tmp_dext->ee_block) + | |
566 | ext4_ext_get_actual_len(tmp_dext) - 1 < orig_off) | |
567 | return -ENODATA; | |
568 | ||
748de673 AF |
569 | dext_old = *tmp_dext; |
570 | oext_old = *tmp_oext; | |
571 | ||
572 | /* When tmp_dext is too large, pick up the target range. */ | |
573 | diff = donor_off - le32_to_cpu(tmp_dext->ee_block); | |
574 | ||
bf89d16f | 575 | ext4_ext_store_pblock(tmp_dext, ext4_ext_pblock(tmp_dext) + diff); |
ba39ebb6 WY |
576 | le32_add_cpu(&tmp_dext->ee_block, diff); |
577 | le16_add_cpu(&tmp_dext->ee_len, -diff); | |
748de673 AF |
578 | |
579 | if (max_count < ext4_ext_get_actual_len(tmp_dext)) | |
580 | tmp_dext->ee_len = cpu_to_le16(max_count); | |
581 | ||
582 | orig_diff = orig_off - le32_to_cpu(tmp_oext->ee_block); | |
bf89d16f | 583 | ext4_ext_store_pblock(tmp_oext, ext4_ext_pblock(tmp_oext) + orig_diff); |
748de673 AF |
584 | |
585 | /* Adjust extent length if donor extent is larger than orig */ | |
586 | if (ext4_ext_get_actual_len(tmp_dext) > | |
587 | ext4_ext_get_actual_len(tmp_oext) - orig_diff) | |
588 | tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_oext->ee_len) - | |
589 | orig_diff); | |
590 | ||
591 | tmp_oext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(tmp_dext)); | |
592 | ||
593 | copy_extent_status(&oext_old, tmp_dext); | |
594 | copy_extent_status(&dext_old, tmp_oext); | |
c40ce3c9 AF |
595 | |
596 | return 0; | |
748de673 AF |
597 | } |
598 | ||
8c854473 DM |
599 | /** |
600 | * mext_check_coverage - Check that all extents in range has the same type | |
601 | * | |
602 | * @inode: inode in question | |
603 | * @from: block offset of inode | |
604 | * @count: block count to be checked | |
605 | * @uninit: extents expected to be uninitialized | |
606 | * @err: pointer to save error value | |
607 | * | |
608 | * Return 1 if all extents in range has expected type, and zero otherwise. | |
609 | */ | |
610 | static int | |
611 | mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count, | |
612 | int uninit, int *err) | |
613 | { | |
614 | struct ext4_ext_path *path = NULL; | |
615 | struct ext4_extent *ext; | |
0e401101 | 616 | int ret = 0; |
8c854473 DM |
617 | ext4_lblk_t last = from + count; |
618 | while (from < last) { | |
619 | *err = get_ext_path(inode, from, &path); | |
620 | if (*err) | |
0e401101 | 621 | goto out; |
8c854473 | 622 | ext = path[ext_depth(inode)].p_ext; |
0e401101 DM |
623 | if (uninit != ext4_ext_is_uninitialized(ext)) |
624 | goto out; | |
8c854473 DM |
625 | from += ext4_ext_get_actual_len(ext); |
626 | ext4_ext_drop_refs(path); | |
627 | } | |
0e401101 DM |
628 | ret = 1; |
629 | out: | |
630 | if (path) { | |
631 | ext4_ext_drop_refs(path); | |
632 | kfree(path); | |
633 | } | |
634 | return ret; | |
8c854473 DM |
635 | } |
636 | ||
748de673 AF |
637 | /** |
638 | * mext_replace_branches - Replace original extents with new extents | |
639 | * | |
640 | * @handle: journal handle | |
641 | * @orig_inode: original inode | |
642 | * @donor_inode: donor inode | |
643 | * @from: block offset of orig_inode | |
644 | * @count: block count to be replaced | |
f868a48d | 645 | * @err: pointer to save return value |
748de673 AF |
646 | * |
647 | * Replace original inode extents and donor inode extents page by page. | |
648 | * We implement this replacement in the following three steps: | |
649 | * 1. Save the block information of original and donor inodes into | |
650 | * dummy extents. | |
651 | * 2. Change the block information of original inode to point at the | |
652 | * donor inode blocks. | |
653 | * 3. Change the block information of donor inode to point at the saved | |
654 | * original inode blocks in the dummy extents. | |
655 | * | |
f868a48d | 656 | * Return replaced block count. |
748de673 AF |
657 | */ |
658 | static int | |
659 | mext_replace_branches(handle_t *handle, struct inode *orig_inode, | |
660 | struct inode *donor_inode, ext4_lblk_t from, | |
f868a48d | 661 | ext4_lblk_t count, int *err) |
748de673 AF |
662 | { |
663 | struct ext4_ext_path *orig_path = NULL; | |
664 | struct ext4_ext_path *donor_path = NULL; | |
665 | struct ext4_extent *oext, *dext; | |
666 | struct ext4_extent tmp_dext, tmp_oext; | |
667 | ext4_lblk_t orig_off = from, donor_off = from; | |
748de673 AF |
668 | int depth; |
669 | int replaced_count = 0; | |
670 | int dext_alen; | |
671 | ||
6ca470d7 DM |
672 | *err = ext4_es_remove_extent(orig_inode, from, count); |
673 | if (*err) | |
674 | goto out; | |
675 | ||
676 | *err = ext4_es_remove_extent(donor_inode, from, count); | |
677 | if (*err) | |
678 | goto out; | |
679 | ||
748de673 | 680 | /* Get the original extent for the block "orig_off" */ |
f868a48d AF |
681 | *err = get_ext_path(orig_inode, orig_off, &orig_path); |
682 | if (*err) | |
748de673 AF |
683 | goto out; |
684 | ||
685 | /* Get the donor extent for the head */ | |
f868a48d AF |
686 | *err = get_ext_path(donor_inode, donor_off, &donor_path); |
687 | if (*err) | |
748de673 AF |
688 | goto out; |
689 | depth = ext_depth(orig_inode); | |
690 | oext = orig_path[depth].p_ext; | |
691 | tmp_oext = *oext; | |
692 | ||
693 | depth = ext_depth(donor_inode); | |
694 | dext = donor_path[depth].p_ext; | |
87e69873 AF |
695 | if (unlikely(!dext)) |
696 | goto missing_donor_extent; | |
748de673 AF |
697 | tmp_dext = *dext; |
698 | ||
f868a48d | 699 | *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, |
748de673 | 700 | donor_off, count); |
f868a48d | 701 | if (*err) |
c40ce3c9 | 702 | goto out; |
748de673 AF |
703 | |
704 | /* Loop for the donor extents */ | |
705 | while (1) { | |
706 | /* The extent for donor must be found. */ | |
87e69873 AF |
707 | if (unlikely(!dext)) { |
708 | missing_donor_extent: | |
24676da4 | 709 | EXT4_ERROR_INODE(donor_inode, |
2147b1a6 | 710 | "The extent for donor must be found"); |
f868a48d | 711 | *err = -EIO; |
2147b1a6 AF |
712 | goto out; |
713 | } else if (donor_off != le32_to_cpu(tmp_dext.ee_block)) { | |
24676da4 | 714 | EXT4_ERROR_INODE(donor_inode, |
2147b1a6 AF |
715 | "Donor offset(%u) and the first block of donor " |
716 | "extent(%u) should be equal", | |
717 | donor_off, | |
718 | le32_to_cpu(tmp_dext.ee_block)); | |
f868a48d | 719 | *err = -EIO; |
2147b1a6 AF |
720 | goto out; |
721 | } | |
748de673 AF |
722 | |
723 | /* Set donor extent to orig extent */ | |
f868a48d | 724 | *err = mext_leaf_block(handle, orig_inode, |
748de673 | 725 | orig_path, &tmp_dext, &orig_off); |
f868a48d | 726 | if (*err) |
748de673 AF |
727 | goto out; |
728 | ||
729 | /* Set orig extent to donor extent */ | |
f868a48d | 730 | *err = mext_leaf_block(handle, donor_inode, |
748de673 | 731 | donor_path, &tmp_oext, &donor_off); |
f868a48d | 732 | if (*err) |
748de673 AF |
733 | goto out; |
734 | ||
735 | dext_alen = ext4_ext_get_actual_len(&tmp_dext); | |
736 | replaced_count += dext_alen; | |
737 | donor_off += dext_alen; | |
738 | orig_off += dext_alen; | |
739 | ||
740 | /* Already moved the expected blocks */ | |
741 | if (replaced_count >= count) | |
742 | break; | |
743 | ||
744 | if (orig_path) | |
745 | ext4_ext_drop_refs(orig_path); | |
f868a48d AF |
746 | *err = get_ext_path(orig_inode, orig_off, &orig_path); |
747 | if (*err) | |
748de673 AF |
748 | goto out; |
749 | depth = ext_depth(orig_inode); | |
750 | oext = orig_path[depth].p_ext; | |
748de673 AF |
751 | tmp_oext = *oext; |
752 | ||
753 | if (donor_path) | |
754 | ext4_ext_drop_refs(donor_path); | |
f868a48d AF |
755 | *err = get_ext_path(donor_inode, donor_off, &donor_path); |
756 | if (*err) | |
748de673 AF |
757 | goto out; |
758 | depth = ext_depth(donor_inode); | |
759 | dext = donor_path[depth].p_ext; | |
748de673 AF |
760 | tmp_dext = *dext; |
761 | ||
f868a48d | 762 | *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, |
c40ce3c9 | 763 | donor_off, count - replaced_count); |
f868a48d | 764 | if (*err) |
c40ce3c9 | 765 | goto out; |
748de673 AF |
766 | } |
767 | ||
768 | out: | |
769 | if (orig_path) { | |
770 | ext4_ext_drop_refs(orig_path); | |
771 | kfree(orig_path); | |
772 | } | |
773 | if (donor_path) { | |
774 | ext4_ext_drop_refs(donor_path); | |
775 | kfree(donor_path); | |
776 | } | |
777 | ||
f868a48d | 778 | return replaced_count; |
748de673 AF |
779 | } |
780 | ||
bb557488 DM |
781 | /** |
782 | * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2 | |
783 | * | |
784 | * @inode1: the inode structure | |
785 | * @inode2: the inode structure | |
786 | * @index: page index | |
787 | * @page: result page vector | |
788 | * | |
789 | * Grab two locked pages for inode's by inode order | |
790 | */ | |
791 | static int | |
792 | mext_page_double_lock(struct inode *inode1, struct inode *inode2, | |
793 | pgoff_t index, struct page *page[2]) | |
794 | { | |
795 | struct address_space *mapping[2]; | |
796 | unsigned fl = AOP_FLAG_NOFS; | |
797 | ||
798 | BUG_ON(!inode1 || !inode2); | |
799 | if (inode1 < inode2) { | |
800 | mapping[0] = inode1->i_mapping; | |
801 | mapping[1] = inode2->i_mapping; | |
802 | } else { | |
803 | mapping[0] = inode2->i_mapping; | |
804 | mapping[1] = inode1->i_mapping; | |
805 | } | |
806 | ||
807 | page[0] = grab_cache_page_write_begin(mapping[0], index, fl); | |
808 | if (!page[0]) | |
809 | return -ENOMEM; | |
810 | ||
811 | page[1] = grab_cache_page_write_begin(mapping[1], index, fl); | |
812 | if (!page[1]) { | |
813 | unlock_page(page[0]); | |
814 | page_cache_release(page[0]); | |
815 | return -ENOMEM; | |
816 | } | |
817 | ||
818 | if (inode1 > inode2) { | |
819 | struct page *tmp; | |
820 | tmp = page[0]; | |
821 | page[0] = page[1]; | |
822 | page[1] = tmp; | |
823 | } | |
824 | return 0; | |
825 | } | |
826 | ||
827 | /* Force page buffers uptodate w/o dropping page's lock */ | |
828 | static int | |
829 | mext_page_mkuptodate(struct page *page, unsigned from, unsigned to) | |
830 | { | |
831 | struct inode *inode = page->mapping->host; | |
832 | sector_t block; | |
833 | struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; | |
834 | unsigned int blocksize, block_start, block_end; | |
835 | int i, err, nr = 0, partial = 0; | |
836 | BUG_ON(!PageLocked(page)); | |
837 | BUG_ON(PageWriteback(page)); | |
838 | ||
839 | if (PageUptodate(page)) | |
840 | return 0; | |
841 | ||
842 | blocksize = 1 << inode->i_blkbits; | |
843 | if (!page_has_buffers(page)) | |
844 | create_empty_buffers(page, blocksize, 0); | |
845 | ||
846 | head = page_buffers(page); | |
847 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
848 | for (bh = head, block_start = 0; bh != head || !block_start; | |
849 | block++, block_start = block_end, bh = bh->b_this_page) { | |
850 | block_end = block_start + blocksize; | |
851 | if (block_end <= from || block_start >= to) { | |
852 | if (!buffer_uptodate(bh)) | |
853 | partial = 1; | |
854 | continue; | |
855 | } | |
856 | if (buffer_uptodate(bh)) | |
857 | continue; | |
858 | if (!buffer_mapped(bh)) { | |
859 | int err = 0; | |
860 | err = ext4_get_block(inode, block, bh, 0); | |
861 | if (err) { | |
862 | SetPageError(page); | |
863 | return err; | |
864 | } | |
865 | if (!buffer_mapped(bh)) { | |
866 | zero_user(page, block_start, blocksize); | |
867 | if (!err) | |
868 | set_buffer_uptodate(bh); | |
869 | continue; | |
870 | } | |
871 | } | |
872 | BUG_ON(nr >= MAX_BUF_PER_PAGE); | |
873 | arr[nr++] = bh; | |
874 | } | |
875 | /* No io required */ | |
876 | if (!nr) | |
877 | goto out; | |
878 | ||
879 | for (i = 0; i < nr; i++) { | |
880 | bh = arr[i]; | |
881 | if (!bh_uptodate_or_lock(bh)) { | |
882 | err = bh_submit_read(bh); | |
883 | if (err) | |
884 | return err; | |
885 | } | |
886 | } | |
887 | out: | |
888 | if (!partial) | |
889 | SetPageUptodate(page); | |
890 | return 0; | |
891 | } | |
892 | ||
748de673 AF |
893 | /** |
894 | * move_extent_per_page - Move extent data per page | |
895 | * | |
896 | * @o_filp: file structure of original file | |
897 | * @donor_inode: donor inode | |
898 | * @orig_page_offset: page index on original file | |
899 | * @data_offset_in_page: block index where data swapping starts | |
900 | * @block_len_in_page: the number of blocks to be swapped | |
901 | * @uninit: orig extent is uninitialized or not | |
f868a48d | 902 | * @err: pointer to save return value |
748de673 AF |
903 | * |
904 | * Save the data in original inode blocks and replace original inode extents | |
905 | * with donor inode extents by calling mext_replace_branches(). | |
f868a48d AF |
906 | * Finally, write out the saved data in new original inode blocks. Return |
907 | * replaced block count. | |
748de673 AF |
908 | */ |
909 | static int | |
44fc48f7 | 910 | move_extent_per_page(struct file *o_filp, struct inode *donor_inode, |
748de673 | 911 | pgoff_t orig_page_offset, int data_offset_in_page, |
f868a48d | 912 | int block_len_in_page, int uninit, int *err) |
748de673 | 913 | { |
496ad9aa | 914 | struct inode *orig_inode = file_inode(o_filp); |
bb557488 | 915 | struct page *pagep[2] = {NULL, NULL}; |
748de673 AF |
916 | handle_t *handle; |
917 | ext4_lblk_t orig_blk_offset; | |
918 | long long offs = orig_page_offset << PAGE_CACHE_SHIFT; | |
919 | unsigned long blocksize = orig_inode->i_sb->s_blocksize; | |
920 | unsigned int w_flags = 0; | |
f868a48d | 921 | unsigned int tmp_data_size, data_size, replaced_size; |
bb557488 | 922 | int err2, jblocks, retries = 0; |
f868a48d | 923 | int replaced_count = 0; |
bb557488 | 924 | int from = data_offset_in_page << orig_inode->i_blkbits; |
748de673 AF |
925 | int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; |
926 | ||
927 | /* | |
928 | * It needs twice the amount of ordinary journal buffers because | |
929 | * inode and donor_inode may change each different metadata blocks. | |
930 | */ | |
bb557488 DM |
931 | again: |
932 | *err = 0; | |
748de673 | 933 | jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; |
9924a92a | 934 | handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks); |
748de673 | 935 | if (IS_ERR(handle)) { |
f868a48d AF |
936 | *err = PTR_ERR(handle); |
937 | return 0; | |
748de673 AF |
938 | } |
939 | ||
940 | if (segment_eq(get_fs(), KERNEL_DS)) | |
941 | w_flags |= AOP_FLAG_UNINTERRUPTIBLE; | |
942 | ||
943 | orig_blk_offset = orig_page_offset * blocks_per_page + | |
944 | data_offset_in_page; | |
945 | ||
748de673 AF |
946 | offs = (long long)orig_blk_offset << orig_inode->i_blkbits; |
947 | ||
f868a48d | 948 | /* Calculate data_size */ |
748de673 AF |
949 | if ((orig_blk_offset + block_len_in_page - 1) == |
950 | ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { | |
951 | /* Replace the last block */ | |
f868a48d | 952 | tmp_data_size = orig_inode->i_size & (blocksize - 1); |
748de673 | 953 | /* |
f868a48d | 954 | * If data_size equal zero, it shows data_size is multiples of |
748de673 AF |
955 | * blocksize. So we set appropriate value. |
956 | */ | |
f868a48d AF |
957 | if (tmp_data_size == 0) |
958 | tmp_data_size = blocksize; | |
748de673 | 959 | |
f868a48d | 960 | data_size = tmp_data_size + |
748de673 | 961 | ((block_len_in_page - 1) << orig_inode->i_blkbits); |
f868a48d AF |
962 | } else |
963 | data_size = block_len_in_page << orig_inode->i_blkbits; | |
964 | ||
965 | replaced_size = data_size; | |
748de673 | 966 | |
bb557488 DM |
967 | *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset, |
968 | pagep); | |
f868a48d | 969 | if (unlikely(*err < 0)) |
bb557488 | 970 | goto stop_journal; |
8c854473 DM |
971 | /* |
972 | * If orig extent was uninitialized it can become initialized | |
973 | * at any time after i_data_sem was dropped, in order to | |
974 | * serialize with delalloc we have recheck extent while we | |
975 | * hold page's lock, if it is still the case data copy is not | |
976 | * necessary, just swap data blocks between orig and donor. | |
977 | */ | |
978 | if (uninit) { | |
979 | double_down_write_data_sem(orig_inode, donor_inode); | |
980 | /* If any of extents in range became initialized we have to | |
981 | * fallback to data copying */ | |
982 | uninit = mext_check_coverage(orig_inode, orig_blk_offset, | |
983 | block_len_in_page, 1, err); | |
984 | if (*err) | |
985 | goto drop_data_sem; | |
748de673 | 986 | |
8c854473 DM |
987 | uninit &= mext_check_coverage(donor_inode, orig_blk_offset, |
988 | block_len_in_page, 1, err); | |
989 | if (*err) | |
990 | goto drop_data_sem; | |
991 | ||
992 | if (!uninit) { | |
993 | double_up_write_data_sem(orig_inode, donor_inode); | |
994 | goto data_copy; | |
995 | } | |
996 | if ((page_has_private(pagep[0]) && | |
997 | !try_to_release_page(pagep[0], 0)) || | |
998 | (page_has_private(pagep[1]) && | |
999 | !try_to_release_page(pagep[1], 0))) { | |
1000 | *err = -EBUSY; | |
1001 | goto drop_data_sem; | |
1002 | } | |
1003 | replaced_count = mext_replace_branches(handle, orig_inode, | |
1004 | donor_inode, orig_blk_offset, | |
1005 | block_len_in_page, err); | |
1006 | drop_data_sem: | |
1007 | double_up_write_data_sem(orig_inode, donor_inode); | |
1008 | goto unlock_pages; | |
1009 | } | |
1010 | data_copy: | |
bb557488 DM |
1011 | *err = mext_page_mkuptodate(pagep[0], from, from + replaced_size); |
1012 | if (*err) | |
1013 | goto unlock_pages; | |
1014 | ||
1015 | /* At this point all buffers in range are uptodate, old mapping layout | |
1016 | * is no longer required, try to drop it now. */ | |
1017 | if ((page_has_private(pagep[0]) && !try_to_release_page(pagep[0], 0)) || | |
1018 | (page_has_private(pagep[1]) && !try_to_release_page(pagep[1], 0))) { | |
1019 | *err = -EBUSY; | |
1020 | goto unlock_pages; | |
748de673 AF |
1021 | } |
1022 | ||
f868a48d | 1023 | replaced_count = mext_replace_branches(handle, orig_inode, donor_inode, |
bb557488 DM |
1024 | orig_blk_offset, |
1025 | block_len_in_page, err); | |
1026 | if (*err) { | |
f868a48d AF |
1027 | if (replaced_count) { |
1028 | block_len_in_page = replaced_count; | |
1029 | replaced_size = | |
1030 | block_len_in_page << orig_inode->i_blkbits; | |
ac48b0a1 | 1031 | } else |
bb557488 | 1032 | goto unlock_pages; |
748de673 | 1033 | } |
bb557488 DM |
1034 | /* Perform all necessary steps similar write_begin()/write_end() |
1035 | * but keeping in mind that i_size will not change */ | |
1036 | *err = __block_write_begin(pagep[0], from, from + replaced_size, | |
1037 | ext4_get_block); | |
1038 | if (!*err) | |
1039 | *err = block_commit_write(pagep[0], from, from + replaced_size); | |
748de673 | 1040 | |
bb557488 DM |
1041 | if (unlikely(*err < 0)) |
1042 | goto repair_branches; | |
1043 | ||
1044 | /* Even in case of data=writeback it is reasonable to pin | |
1045 | * inode to transaction, to prevent unexpected data loss */ | |
1046 | *err = ext4_jbd2_file_inode(handle, orig_inode); | |
1047 | ||
1048 | unlock_pages: | |
1049 | unlock_page(pagep[0]); | |
1050 | page_cache_release(pagep[0]); | |
1051 | unlock_page(pagep[1]); | |
1052 | page_cache_release(pagep[1]); | |
1053 | stop_journal: | |
748de673 | 1054 | ext4_journal_stop(handle); |
bb557488 DM |
1055 | /* Buffer was busy because probably is pinned to journal transaction, |
1056 | * force transaction commit may help to free it. */ | |
1057 | if (*err == -EBUSY && ext4_should_retry_alloc(orig_inode->i_sb, | |
1058 | &retries)) | |
1059 | goto again; | |
f868a48d | 1060 | return replaced_count; |
bb557488 DM |
1061 | |
1062 | repair_branches: | |
1063 | /* | |
1064 | * This should never ever happen! | |
1065 | * Extents are swapped already, but we are not able to copy data. | |
1066 | * Try to swap extents to it's original places | |
1067 | */ | |
1068 | double_down_write_data_sem(orig_inode, donor_inode); | |
1069 | replaced_count = mext_replace_branches(handle, donor_inode, orig_inode, | |
1070 | orig_blk_offset, | |
1071 | block_len_in_page, &err2); | |
1072 | double_up_write_data_sem(orig_inode, donor_inode); | |
1073 | if (replaced_count != block_len_in_page) { | |
1074 | EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset), | |
1075 | "Unable to copy data block," | |
1076 | " data will be lost."); | |
1077 | *err = -EIO; | |
1078 | } | |
1079 | replaced_count = 0; | |
1080 | goto unlock_pages; | |
748de673 AF |
1081 | } |
1082 | ||
1083 | /** | |
c437b273 | 1084 | * mext_check_arguments - Check whether move extent can be done |
748de673 AF |
1085 | * |
1086 | * @orig_inode: original inode | |
1087 | * @donor_inode: donor inode | |
1088 | * @orig_start: logical start offset in block for orig | |
1089 | * @donor_start: logical start offset in block for donor | |
1090 | * @len: the number of blocks to be moved | |
748de673 AF |
1091 | * |
1092 | * Check the arguments of ext4_move_extents() whether the files can be | |
1093 | * exchanged with each other. | |
1094 | * Return 0 on success, or a negative error value on failure. | |
1095 | */ | |
1096 | static int | |
1097 | mext_check_arguments(struct inode *orig_inode, | |
446aaa6e KM |
1098 | struct inode *donor_inode, __u64 orig_start, |
1099 | __u64 donor_start, __u64 *len) | |
748de673 | 1100 | { |
70d5d3dc AF |
1101 | ext4_lblk_t orig_blocks, donor_blocks; |
1102 | unsigned int blkbits = orig_inode->i_blkbits; | |
1103 | unsigned int blocksize = 1 << blkbits; | |
1104 | ||
4a58579b AF |
1105 | if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { |
1106 | ext4_debug("ext4 move extent: suid or sgid is set" | |
1107 | " to donor file [ino:orig %lu, donor %lu]\n", | |
1108 | orig_inode->i_ino, donor_inode->i_ino); | |
1109 | return -EINVAL; | |
1110 | } | |
1111 | ||
1f5a81e4 TT |
1112 | if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) |
1113 | return -EPERM; | |
1114 | ||
748de673 AF |
1115 | /* Ext4 move extent does not support swapfile */ |
1116 | if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { | |
1117 | ext4_debug("ext4 move extent: The argument files should " | |
1118 | "not be swapfile [ino:orig %lu, donor %lu]\n", | |
1119 | orig_inode->i_ino, donor_inode->i_ino); | |
1120 | return -EINVAL; | |
1121 | } | |
1122 | ||
748de673 | 1123 | /* Ext4 move extent supports only extent based file */ |
12e9b892 | 1124 | if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) { |
748de673 AF |
1125 | ext4_debug("ext4 move extent: orig file is not extents " |
1126 | "based file [ino:orig %lu]\n", orig_inode->i_ino); | |
1127 | return -EOPNOTSUPP; | |
12e9b892 | 1128 | } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) { |
748de673 AF |
1129 | ext4_debug("ext4 move extent: donor file is not extents " |
1130 | "based file [ino:donor %lu]\n", donor_inode->i_ino); | |
1131 | return -EOPNOTSUPP; | |
1132 | } | |
1133 | ||
1134 | if ((!orig_inode->i_size) || (!donor_inode->i_size)) { | |
1135 | ext4_debug("ext4 move extent: File size is 0 byte\n"); | |
1136 | return -EINVAL; | |
1137 | } | |
1138 | ||
1139 | /* Start offset should be same */ | |
1140 | if (orig_start != donor_start) { | |
1141 | ext4_debug("ext4 move extent: orig and donor's start " | |
1142 | "offset are not same [ino:orig %lu, donor %lu]\n", | |
1143 | orig_inode->i_ino, donor_inode->i_ino); | |
1144 | return -EINVAL; | |
1145 | } | |
1146 | ||
f17722f9 | 1147 | if ((orig_start >= EXT_MAX_BLOCKS) || |
f17722f9 LC |
1148 | (*len > EXT_MAX_BLOCKS) || |
1149 | (orig_start + *len >= EXT_MAX_BLOCKS)) { | |
0a80e986 | 1150 | ext4_debug("ext4 move extent: Can't handle over [%u] blocks " |
f17722f9 | 1151 | "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, |
748de673 AF |
1152 | orig_inode->i_ino, donor_inode->i_ino); |
1153 | return -EINVAL; | |
1154 | } | |
1155 | ||
1156 | if (orig_inode->i_size > donor_inode->i_size) { | |
70d5d3dc AF |
1157 | donor_blocks = (donor_inode->i_size + blocksize - 1) >> blkbits; |
1158 | /* TODO: eliminate this artificial restriction */ | |
1159 | if (orig_start >= donor_blocks) { | |
748de673 | 1160 | ext4_debug("ext4 move extent: orig start offset " |
70d5d3dc AF |
1161 | "[%llu] should be less than donor file blocks " |
1162 | "[%u] [ino:orig %lu, donor %lu]\n", | |
1163 | orig_start, donor_blocks, | |
748de673 AF |
1164 | orig_inode->i_ino, donor_inode->i_ino); |
1165 | return -EINVAL; | |
1166 | } | |
1167 | ||
70d5d3dc AF |
1168 | /* TODO: eliminate this artificial restriction */ |
1169 | if (orig_start + *len > donor_blocks) { | |
748de673 | 1170 | ext4_debug("ext4 move extent: End offset [%llu] should " |
70d5d3dc AF |
1171 | "be less than donor file blocks [%u]." |
1172 | "So adjust length from %llu to %llu " | |
748de673 | 1173 | "[ino:orig %lu, donor %lu]\n", |
70d5d3dc AF |
1174 | orig_start + *len, donor_blocks, |
1175 | *len, donor_blocks - orig_start, | |
748de673 | 1176 | orig_inode->i_ino, donor_inode->i_ino); |
70d5d3dc | 1177 | *len = donor_blocks - orig_start; |
748de673 AF |
1178 | } |
1179 | } else { | |
70d5d3dc AF |
1180 | orig_blocks = (orig_inode->i_size + blocksize - 1) >> blkbits; |
1181 | if (orig_start >= orig_blocks) { | |
748de673 | 1182 | ext4_debug("ext4 move extent: start offset [%llu] " |
70d5d3dc AF |
1183 | "should be less than original file blocks " |
1184 | "[%u] [ino:orig %lu, donor %lu]\n", | |
1185 | orig_start, orig_blocks, | |
748de673 AF |
1186 | orig_inode->i_ino, donor_inode->i_ino); |
1187 | return -EINVAL; | |
1188 | } | |
1189 | ||
70d5d3dc | 1190 | if (orig_start + *len > orig_blocks) { |
748de673 | 1191 | ext4_debug("ext4 move extent: Adjust length " |
70d5d3dc AF |
1192 | "from %llu to %llu. Because it should be " |
1193 | "less than original file blocks " | |
748de673 | 1194 | "[ino:orig %lu, donor %lu]\n", |
70d5d3dc | 1195 | *len, orig_blocks - orig_start, |
748de673 | 1196 | orig_inode->i_ino, donor_inode->i_ino); |
70d5d3dc | 1197 | *len = orig_blocks - orig_start; |
748de673 AF |
1198 | } |
1199 | } | |
1200 | ||
1201 | if (!*len) { | |
92c28159 | 1202 | ext4_debug("ext4 move extent: len should not be 0 " |
748de673 AF |
1203 | "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, |
1204 | donor_inode->i_ino); | |
1205 | return -EINVAL; | |
1206 | } | |
1207 | ||
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * mext_inode_double_lock - Lock i_mutex on both @inode1 and @inode2 | |
1213 | * | |
1214 | * @inode1: the inode structure | |
1215 | * @inode2: the inode structure | |
1216 | * | |
03bd8b9b | 1217 | * Lock two inodes' i_mutex |
748de673 | 1218 | */ |
03bd8b9b | 1219 | static void |
748de673 AF |
1220 | mext_inode_double_lock(struct inode *inode1, struct inode *inode2) |
1221 | { | |
03bd8b9b DM |
1222 | BUG_ON(inode1 == inode2); |
1223 | if (inode1 < inode2) { | |
748de673 AF |
1224 | mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); |
1225 | mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); | |
1226 | } else { | |
1227 | mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT); | |
1228 | mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD); | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * mext_inode_double_unlock - Release i_mutex on both @inode1 and @inode2 | |
1234 | * | |
1235 | * @inode1: the inode that is released first | |
1236 | * @inode2: the inode that is released second | |
1237 | * | |
748de673 AF |
1238 | */ |
1239 | ||
03bd8b9b | 1240 | static void |
748de673 AF |
1241 | mext_inode_double_unlock(struct inode *inode1, struct inode *inode2) |
1242 | { | |
03bd8b9b DM |
1243 | mutex_unlock(&inode1->i_mutex); |
1244 | mutex_unlock(&inode2->i_mutex); | |
748de673 AF |
1245 | } |
1246 | ||
1247 | /** | |
1248 | * ext4_move_extents - Exchange the specified range of a file | |
1249 | * | |
1250 | * @o_filp: file structure of the original file | |
1251 | * @d_filp: file structure of the donor file | |
1252 | * @orig_start: start offset in block for orig | |
1253 | * @donor_start: start offset in block for donor | |
1254 | * @len: the number of blocks to be moved | |
1255 | * @moved_len: moved block length | |
1256 | * | |
1257 | * This function returns 0 and moved block length is set in moved_len | |
1258 | * if succeed, otherwise returns error value. | |
1259 | * | |
1260 | * Note: ext4_move_extents() proceeds the following order. | |
1261 | * 1:ext4_move_extents() calculates the last block number of moving extent | |
1262 | * function by the start block number (orig_start) and the number of blocks | |
1263 | * to be moved (len) specified as arguments. | |
1264 | * If the {orig, donor}_start points a hole, the extent's start offset | |
1265 | * pointed by ext_cur (current extent), holecheck_path, orig_path are set | |
1266 | * after hole behind. | |
1267 | * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent | |
1268 | * or the ext_cur exceeds the block_end which is last logical block number. | |
1269 | * 3:To get the length of continues area, call mext_next_extent() | |
1270 | * specified with the ext_cur (initial value is holecheck_path) re-cursive, | |
1271 | * until find un-continuous extent, the start logical block number exceeds | |
1272 | * the block_end or the extent points to the last extent. | |
1273 | * 4:Exchange the original inode data with donor inode data | |
1274 | * from orig_page_offset to seq_end_page. | |
1275 | * The start indexes of data are specified as arguments. | |
1276 | * That of the original inode is orig_page_offset, | |
1277 | * and the donor inode is also orig_page_offset | |
1278 | * (To easily handle blocksize != pagesize case, the offset for the | |
1279 | * donor inode is block unit). | |
1280 | * 5:Update holecheck_path and orig_path to points a next proceeding extent, | |
1281 | * then returns to step 2. | |
1282 | * 6:Release holecheck_path, orig_path and set the len to moved_len | |
1283 | * which shows the number of moved blocks. | |
1284 | * The moved_len is useful for the command to calculate the file offset | |
1285 | * for starting next move extent ioctl. | |
1286 | * 7:Return 0 on success, or a negative error value on failure. | |
1287 | */ | |
1288 | int | |
1289 | ext4_move_extents(struct file *o_filp, struct file *d_filp, | |
1290 | __u64 orig_start, __u64 donor_start, __u64 len, | |
1291 | __u64 *moved_len) | |
1292 | { | |
496ad9aa AV |
1293 | struct inode *orig_inode = file_inode(o_filp); |
1294 | struct inode *donor_inode = file_inode(d_filp); | |
748de673 AF |
1295 | struct ext4_ext_path *orig_path = NULL, *holecheck_path = NULL; |
1296 | struct ext4_extent *ext_prev, *ext_cur, *ext_dummy; | |
1297 | ext4_lblk_t block_start = orig_start; | |
1298 | ext4_lblk_t block_end, seq_start, add_blocks, file_end, seq_blocks = 0; | |
1299 | ext4_lblk_t rest_blocks; | |
1300 | pgoff_t orig_page_offset = 0, seq_end_page; | |
03bd8b9b | 1301 | int ret, depth, last_extent = 0; |
748de673 AF |
1302 | int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; |
1303 | int data_offset_in_page; | |
1304 | int block_len_in_page; | |
1305 | int uninit; | |
1306 | ||
03bd8b9b DM |
1307 | if (orig_inode->i_sb != donor_inode->i_sb) { |
1308 | ext4_debug("ext4 move extent: The argument files " | |
1309 | "should be in same FS [ino:orig %lu, donor %lu]\n", | |
1310 | orig_inode->i_ino, donor_inode->i_ino); | |
1311 | return -EINVAL; | |
1312 | } | |
1313 | ||
1314 | /* orig and donor should be different inodes */ | |
1315 | if (orig_inode == donor_inode) { | |
f3ce8064 | 1316 | ext4_debug("ext4 move extent: The argument files should not " |
03bd8b9b | 1317 | "be same inode [ino:orig %lu, donor %lu]\n", |
f3ce8064 TT |
1318 | orig_inode->i_ino, donor_inode->i_ino); |
1319 | return -EINVAL; | |
1320 | } | |
1321 | ||
7247c0ca AF |
1322 | /* Regular file check */ |
1323 | if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { | |
1324 | ext4_debug("ext4 move extent: The argument files should be " | |
1325 | "regular file [ino:orig %lu, donor %lu]\n", | |
1326 | orig_inode->i_ino, donor_inode->i_ino); | |
1327 | return -EINVAL; | |
1328 | } | |
f066055a DM |
1329 | /* TODO: This is non obvious task to swap blocks for inodes with full |
1330 | jornaling enabled */ | |
1331 | if (ext4_should_journal_data(orig_inode) || | |
1332 | ext4_should_journal_data(donor_inode)) { | |
1333 | return -EINVAL; | |
1334 | } | |
fc04cb49 | 1335 | /* Protect orig and donor inodes against a truncate */ |
03bd8b9b | 1336 | mext_inode_double_lock(orig_inode, donor_inode); |
748de673 | 1337 | |
17335dcc DM |
1338 | /* Wait for all existing dio workers */ |
1339 | ext4_inode_block_unlocked_dio(orig_inode); | |
1340 | ext4_inode_block_unlocked_dio(donor_inode); | |
1341 | inode_dio_wait(orig_inode); | |
1342 | inode_dio_wait(donor_inode); | |
1343 | ||
fc04cb49 AF |
1344 | /* Protect extent tree against block allocations via delalloc */ |
1345 | double_down_write_data_sem(orig_inode, donor_inode); | |
748de673 | 1346 | /* Check the filesystem environment whether move_extent can be done */ |
03bd8b9b | 1347 | ret = mext_check_arguments(orig_inode, donor_inode, orig_start, |
446aaa6e | 1348 | donor_start, &len); |
03bd8b9b | 1349 | if (ret) |
347fa6f1 | 1350 | goto out; |
748de673 AF |
1351 | |
1352 | file_end = (i_size_read(orig_inode) - 1) >> orig_inode->i_blkbits; | |
1353 | block_end = block_start + len - 1; | |
1354 | if (file_end < block_end) | |
1355 | len -= block_end - file_end; | |
1356 | ||
03bd8b9b DM |
1357 | ret = get_ext_path(orig_inode, block_start, &orig_path); |
1358 | if (ret) | |
347fa6f1 | 1359 | goto out; |
748de673 AF |
1360 | |
1361 | /* Get path structure to check the hole */ | |
03bd8b9b DM |
1362 | ret = get_ext_path(orig_inode, block_start, &holecheck_path); |
1363 | if (ret) | |
748de673 AF |
1364 | goto out; |
1365 | ||
1366 | depth = ext_depth(orig_inode); | |
1367 | ext_cur = holecheck_path[depth].p_ext; | |
748de673 AF |
1368 | |
1369 | /* | |
c40ce3c9 AF |
1370 | * Get proper starting location of block replacement if block_start was |
1371 | * within the hole. | |
748de673 AF |
1372 | */ |
1373 | if (le32_to_cpu(ext_cur->ee_block) + | |
1374 | ext4_ext_get_actual_len(ext_cur) - 1 < block_start) { | |
c40ce3c9 AF |
1375 | /* |
1376 | * The hole exists between extents or the tail of | |
1377 | * original file. | |
1378 | */ | |
748de673 AF |
1379 | last_extent = mext_next_extent(orig_inode, |
1380 | holecheck_path, &ext_cur); | |
1381 | if (last_extent < 0) { | |
03bd8b9b | 1382 | ret = last_extent; |
748de673 AF |
1383 | goto out; |
1384 | } | |
1385 | last_extent = mext_next_extent(orig_inode, orig_path, | |
1386 | &ext_dummy); | |
1387 | if (last_extent < 0) { | |
03bd8b9b | 1388 | ret = last_extent; |
748de673 AF |
1389 | goto out; |
1390 | } | |
c40ce3c9 AF |
1391 | seq_start = le32_to_cpu(ext_cur->ee_block); |
1392 | } else if (le32_to_cpu(ext_cur->ee_block) > block_start) | |
1393 | /* The hole exists at the beginning of original file. */ | |
1394 | seq_start = le32_to_cpu(ext_cur->ee_block); | |
1395 | else | |
1396 | seq_start = block_start; | |
748de673 AF |
1397 | |
1398 | /* No blocks within the specified range. */ | |
1399 | if (le32_to_cpu(ext_cur->ee_block) > block_end) { | |
1400 | ext4_debug("ext4 move extent: The specified range of file " | |
1401 | "may be the hole\n"); | |
03bd8b9b | 1402 | ret = -EINVAL; |
748de673 AF |
1403 | goto out; |
1404 | } | |
1405 | ||
1406 | /* Adjust start blocks */ | |
1407 | add_blocks = min(le32_to_cpu(ext_cur->ee_block) + | |
1408 | ext4_ext_get_actual_len(ext_cur), block_end + 1) - | |
1409 | max(le32_to_cpu(ext_cur->ee_block), block_start); | |
1410 | ||
1411 | while (!last_extent && le32_to_cpu(ext_cur->ee_block) <= block_end) { | |
1412 | seq_blocks += add_blocks; | |
1413 | ||
1414 | /* Adjust tail blocks */ | |
1415 | if (seq_start + seq_blocks - 1 > block_end) | |
1416 | seq_blocks = block_end - seq_start + 1; | |
1417 | ||
1418 | ext_prev = ext_cur; | |
1419 | last_extent = mext_next_extent(orig_inode, holecheck_path, | |
1420 | &ext_cur); | |
1421 | if (last_extent < 0) { | |
03bd8b9b | 1422 | ret = last_extent; |
748de673 AF |
1423 | break; |
1424 | } | |
1425 | add_blocks = ext4_ext_get_actual_len(ext_cur); | |
1426 | ||
1427 | /* | |
1428 | * Extend the length of contiguous block (seq_blocks) | |
1429 | * if extents are contiguous. | |
1430 | */ | |
1431 | if (ext4_can_extents_be_merged(orig_inode, | |
1432 | ext_prev, ext_cur) && | |
1433 | block_end >= le32_to_cpu(ext_cur->ee_block) && | |
1434 | !last_extent) | |
1435 | continue; | |
1436 | ||
1437 | /* Is original extent is uninitialized */ | |
1438 | uninit = ext4_ext_is_uninitialized(ext_prev); | |
1439 | ||
1440 | data_offset_in_page = seq_start % blocks_per_page; | |
1441 | ||
1442 | /* | |
1443 | * Calculate data blocks count that should be swapped | |
1444 | * at the first page. | |
1445 | */ | |
1446 | if (data_offset_in_page + seq_blocks > blocks_per_page) { | |
1447 | /* Swapped blocks are across pages */ | |
1448 | block_len_in_page = | |
1449 | blocks_per_page - data_offset_in_page; | |
1450 | } else { | |
1451 | /* Swapped blocks are in a page */ | |
1452 | block_len_in_page = seq_blocks; | |
1453 | } | |
1454 | ||
1455 | orig_page_offset = seq_start >> | |
1456 | (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); | |
1457 | seq_end_page = (seq_start + seq_blocks - 1) >> | |
1458 | (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); | |
1459 | seq_start = le32_to_cpu(ext_cur->ee_block); | |
1460 | rest_blocks = seq_blocks; | |
1461 | ||
fc04cb49 AF |
1462 | /* |
1463 | * Up semaphore to avoid following problems: | |
1464 | * a. transaction deadlock among ext4_journal_start, | |
1465 | * ->write_begin via pagefault, and jbd2_journal_commit | |
1466 | * b. racing with ->readpage, ->write_begin, and ext4_get_block | |
1467 | * in move_extent_per_page | |
1468 | */ | |
1469 | double_up_write_data_sem(orig_inode, donor_inode); | |
748de673 AF |
1470 | |
1471 | while (orig_page_offset <= seq_end_page) { | |
1472 | ||
1473 | /* Swap original branches with new branches */ | |
f868a48d AF |
1474 | block_len_in_page = move_extent_per_page( |
1475 | o_filp, donor_inode, | |
748de673 AF |
1476 | orig_page_offset, |
1477 | data_offset_in_page, | |
f868a48d | 1478 | block_len_in_page, uninit, |
03bd8b9b | 1479 | &ret); |
f868a48d | 1480 | |
748de673 AF |
1481 | /* Count how many blocks we have exchanged */ |
1482 | *moved_len += block_len_in_page; | |
03bd8b9b | 1483 | if (ret < 0) |
fc04cb49 | 1484 | break; |
2147b1a6 | 1485 | if (*moved_len > len) { |
24676da4 | 1486 | EXT4_ERROR_INODE(orig_inode, |
2147b1a6 AF |
1487 | "We replaced blocks too much! " |
1488 | "sum of replaced: %llu requested: %llu", | |
1489 | *moved_len, len); | |
03bd8b9b | 1490 | ret = -EIO; |
fc04cb49 | 1491 | break; |
2147b1a6 | 1492 | } |
748de673 | 1493 | |
f868a48d | 1494 | orig_page_offset++; |
748de673 AF |
1495 | data_offset_in_page = 0; |
1496 | rest_blocks -= block_len_in_page; | |
1497 | if (rest_blocks > blocks_per_page) | |
1498 | block_len_in_page = blocks_per_page; | |
1499 | else | |
1500 | block_len_in_page = rest_blocks; | |
1501 | } | |
1502 | ||
fc04cb49 | 1503 | double_down_write_data_sem(orig_inode, donor_inode); |
03bd8b9b | 1504 | if (ret < 0) |
fc04cb49 AF |
1505 | break; |
1506 | ||
748de673 AF |
1507 | /* Decrease buffer counter */ |
1508 | if (holecheck_path) | |
1509 | ext4_ext_drop_refs(holecheck_path); | |
03bd8b9b DM |
1510 | ret = get_ext_path(orig_inode, seq_start, &holecheck_path); |
1511 | if (ret) | |
748de673 AF |
1512 | break; |
1513 | depth = holecheck_path->p_depth; | |
1514 | ||
1515 | /* Decrease buffer counter */ | |
1516 | if (orig_path) | |
1517 | ext4_ext_drop_refs(orig_path); | |
03bd8b9b DM |
1518 | ret = get_ext_path(orig_inode, seq_start, &orig_path); |
1519 | if (ret) | |
748de673 AF |
1520 | break; |
1521 | ||
1522 | ext_cur = holecheck_path[depth].p_ext; | |
1523 | add_blocks = ext4_ext_get_actual_len(ext_cur); | |
1524 | seq_blocks = 0; | |
1525 | ||
1526 | } | |
1527 | out: | |
94d7c16c AF |
1528 | if (*moved_len) { |
1529 | ext4_discard_preallocations(orig_inode); | |
1530 | ext4_discard_preallocations(donor_inode); | |
1531 | } | |
1532 | ||
748de673 AF |
1533 | if (orig_path) { |
1534 | ext4_ext_drop_refs(orig_path); | |
1535 | kfree(orig_path); | |
1536 | } | |
1537 | if (holecheck_path) { | |
1538 | ext4_ext_drop_refs(holecheck_path); | |
1539 | kfree(holecheck_path); | |
1540 | } | |
fc04cb49 | 1541 | double_up_write_data_sem(orig_inode, donor_inode); |
17335dcc DM |
1542 | ext4_inode_resume_unlocked_dio(orig_inode); |
1543 | ext4_inode_resume_unlocked_dio(donor_inode); | |
03bd8b9b | 1544 | mext_inode_double_unlock(orig_inode, donor_inode); |
748de673 | 1545 | |
03bd8b9b | 1546 | return ret; |
748de673 | 1547 | } |