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028ba5df TY |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * move_extents.c | |
5 | * | |
6 | * Copyright (C) 2011 Oracle. All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public | |
10 | * License version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | */ | |
17 | #include <linux/fs.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/mount.h> | |
20 | #include <linux/swap.h> | |
21 | ||
22 | #include <cluster/masklog.h> | |
23 | ||
24 | #include "ocfs2.h" | |
25 | #include "ocfs2_ioctl.h" | |
26 | ||
27 | #include "alloc.h" | |
6194ae42 | 28 | #include "localalloc.h" |
028ba5df TY |
29 | #include "aops.h" |
30 | #include "dlmglue.h" | |
31 | #include "extent_map.h" | |
32 | #include "inode.h" | |
33 | #include "journal.h" | |
34 | #include "suballoc.h" | |
35 | #include "uptodate.h" | |
36 | #include "super.h" | |
37 | #include "dir.h" | |
38 | #include "buffer_head_io.h" | |
39 | #include "sysfile.h" | |
028ba5df TY |
40 | #include "refcounttree.h" |
41 | #include "move_extents.h" | |
42 | ||
43 | struct ocfs2_move_extents_context { | |
44 | struct inode *inode; | |
45 | struct file *file; | |
46 | int auto_defrag; | |
4dfa66bd | 47 | int partial; |
028ba5df TY |
48 | int credits; |
49 | u32 new_phys_cpos; | |
50 | u32 clusters_moved; | |
51 | u64 refcount_loc; | |
52 | struct ocfs2_move_extents *range; | |
53 | struct ocfs2_extent_tree et; | |
54 | struct ocfs2_alloc_context *meta_ac; | |
55 | struct ocfs2_alloc_context *data_ac; | |
56 | struct ocfs2_cached_dealloc_ctxt dealloc; | |
57 | }; | |
de474ee8 | 58 | |
8f603e56 TY |
59 | static int __ocfs2_move_extent(handle_t *handle, |
60 | struct ocfs2_move_extents_context *context, | |
61 | u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos, | |
62 | int ext_flags) | |
63 | { | |
64 | int ret = 0, index; | |
65 | struct inode *inode = context->inode; | |
66 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
67 | struct ocfs2_extent_rec *rec, replace_rec; | |
68 | struct ocfs2_path *path = NULL; | |
69 | struct ocfs2_extent_list *el; | |
70 | u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci); | |
71 | u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos); | |
72 | ||
c7dd3392 | 73 | ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos, |
8f603e56 TY |
74 | p_cpos, new_p_cpos, len); |
75 | if (ret) { | |
76 | mlog_errno(ret); | |
77 | goto out; | |
78 | } | |
79 | ||
80 | memset(&replace_rec, 0, sizeof(replace_rec)); | |
81 | replace_rec.e_cpos = cpu_to_le32(cpos); | |
82 | replace_rec.e_leaf_clusters = cpu_to_le16(len); | |
83 | replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb, | |
84 | new_p_cpos)); | |
85 | ||
86 | path = ocfs2_new_path_from_et(&context->et); | |
87 | if (!path) { | |
88 | ret = -ENOMEM; | |
89 | mlog_errno(ret); | |
90 | goto out; | |
91 | } | |
92 | ||
93 | ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos); | |
94 | if (ret) { | |
95 | mlog_errno(ret); | |
96 | goto out; | |
97 | } | |
98 | ||
99 | el = path_leaf_el(path); | |
100 | ||
101 | index = ocfs2_search_extent_list(el, cpos); | |
981035b4 | 102 | if (index == -1) { |
17a5b9ab | 103 | ret = ocfs2_error(inode->i_sb, |
7ecef14a JP |
104 | "Inode %llu has an extent at cpos %u which can no longer be found\n", |
105 | (unsigned long long)ino, cpos); | |
8f603e56 TY |
106 | goto out; |
107 | } | |
108 | ||
109 | rec = &el->l_recs[index]; | |
110 | ||
111 | BUG_ON(ext_flags != rec->e_flags); | |
112 | /* | |
113 | * after moving/defraging to new location, the extent is not going | |
114 | * to be refcounted anymore. | |
115 | */ | |
116 | replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED; | |
117 | ||
118 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), | |
119 | context->et.et_root_bh, | |
120 | OCFS2_JOURNAL_ACCESS_WRITE); | |
121 | if (ret) { | |
122 | mlog_errno(ret); | |
123 | goto out; | |
124 | } | |
125 | ||
126 | ret = ocfs2_split_extent(handle, &context->et, path, index, | |
127 | &replace_rec, context->meta_ac, | |
128 | &context->dealloc); | |
129 | if (ret) { | |
130 | mlog_errno(ret); | |
131 | goto out; | |
132 | } | |
133 | ||
134 | ocfs2_journal_dirty(handle, context->et.et_root_bh); | |
135 | ||
136 | context->new_phys_cpos = new_p_cpos; | |
137 | ||
138 | /* | |
139 | * need I to append truncate log for old clusters? | |
140 | */ | |
141 | if (old_blkno) { | |
142 | if (ext_flags & OCFS2_EXT_REFCOUNTED) | |
143 | ret = ocfs2_decrease_refcount(inode, handle, | |
144 | ocfs2_blocks_to_clusters(osb->sb, | |
145 | old_blkno), | |
146 | len, context->meta_ac, | |
147 | &context->dealloc, 1); | |
148 | else | |
149 | ret = ocfs2_truncate_log_append(osb, handle, | |
150 | old_blkno, len); | |
151 | } | |
152 | ||
6fdb702d | 153 | ocfs2_update_inode_fsync_trans(handle, inode, 0); |
8f603e56 | 154 | out: |
4704aa30 | 155 | ocfs2_free_path(path); |
8f603e56 TY |
156 | return ret; |
157 | } | |
158 | ||
de474ee8 | 159 | /* |
e21e5744 LC |
160 | * lock allocator, and reserve appropriate number of bits for |
161 | * meta blocks. | |
de474ee8 | 162 | */ |
e21e5744 | 163 | static int ocfs2_lock_meta_allocator_move_extents(struct inode *inode, |
de474ee8 TY |
164 | struct ocfs2_extent_tree *et, |
165 | u32 clusters_to_move, | |
166 | u32 extents_to_split, | |
167 | struct ocfs2_alloc_context **meta_ac, | |
de474ee8 TY |
168 | int extra_blocks, |
169 | int *credits) | |
170 | { | |
171 | int ret, num_free_extents; | |
172 | unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move; | |
173 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
174 | ||
964f14a0 | 175 | num_free_extents = ocfs2_num_free_extents(et); |
de474ee8 TY |
176 | if (num_free_extents < 0) { |
177 | ret = num_free_extents; | |
178 | mlog_errno(ret); | |
179 | goto out; | |
180 | } | |
181 | ||
182 | if (!num_free_extents || | |
183 | (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) | |
184 | extra_blocks += ocfs2_extend_meta_needed(et->et_root_el); | |
185 | ||
186 | ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac); | |
187 | if (ret) { | |
188 | mlog_errno(ret); | |
189 | goto out; | |
190 | } | |
191 | ||
de474ee8 | 192 | |
06f9da6e | 193 | *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el); |
de474ee8 TY |
194 | |
195 | mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n", | |
196 | extra_blocks, clusters_to_move, *credits); | |
197 | out: | |
198 | if (ret) { | |
199 | if (*meta_ac) { | |
200 | ocfs2_free_alloc_context(*meta_ac); | |
201 | *meta_ac = NULL; | |
202 | } | |
203 | } | |
204 | ||
205 | return ret; | |
206 | } | |
202ee5fa TY |
207 | |
208 | /* | |
209 | * Using one journal handle to guarantee the data consistency in case | |
210 | * crash happens anywhere. | |
dda54e76 TY |
211 | * |
212 | * XXX: defrag can end up with finishing partial extent as requested, | |
213 | * due to not enough contiguous clusters can be found in allocator. | |
202ee5fa TY |
214 | */ |
215 | static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context, | |
4dfa66bd | 216 | u32 cpos, u32 phys_cpos, u32 *len, int ext_flags) |
202ee5fa | 217 | { |
4dfa66bd | 218 | int ret, credits = 0, extra_blocks = 0, partial = context->partial; |
202ee5fa TY |
219 | handle_t *handle; |
220 | struct inode *inode = context->inode; | |
221 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
222 | struct inode *tl_inode = osb->osb_tl_inode; | |
223 | struct ocfs2_refcount_tree *ref_tree = NULL; | |
224 | u32 new_phys_cpos, new_len; | |
225 | u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); | |
6194ae42 | 226 | int need_free = 0; |
202ee5fa | 227 | |
4dfa66bd | 228 | if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) { |
84e40080 | 229 | BUG_ON(!ocfs2_is_refcount_inode(inode)); |
202ee5fa TY |
230 | BUG_ON(!context->refcount_loc); |
231 | ||
232 | ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1, | |
233 | &ref_tree, NULL); | |
234 | if (ret) { | |
235 | mlog_errno(ret); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | ret = ocfs2_prepare_refcount_change_for_del(inode, | |
240 | context->refcount_loc, | |
241 | phys_blkno, | |
4dfa66bd | 242 | *len, |
202ee5fa TY |
243 | &credits, |
244 | &extra_blocks); | |
245 | if (ret) { | |
246 | mlog_errno(ret); | |
247 | goto out; | |
248 | } | |
249 | } | |
250 | ||
e21e5744 LC |
251 | ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et, |
252 | *len, 1, | |
253 | &context->meta_ac, | |
254 | extra_blocks, &credits); | |
202ee5fa TY |
255 | if (ret) { |
256 | mlog_errno(ret); | |
257 | goto out; | |
258 | } | |
259 | ||
260 | /* | |
261 | * should be using allocation reservation strategy there? | |
262 | * | |
263 | * if (context->data_ac) | |
264 | * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; | |
265 | */ | |
266 | ||
5955102c | 267 | inode_lock(tl_inode); |
202ee5fa TY |
268 | |
269 | if (ocfs2_truncate_log_needs_flush(osb)) { | |
270 | ret = __ocfs2_flush_truncate_log(osb); | |
271 | if (ret < 0) { | |
272 | mlog_errno(ret); | |
273 | goto out_unlock_mutex; | |
274 | } | |
275 | } | |
276 | ||
e21e5744 LC |
277 | /* |
278 | * Make sure ocfs2_reserve_cluster is called after | |
279 | * __ocfs2_flush_truncate_log, otherwise, dead lock may happen. | |
280 | * | |
281 | * If ocfs2_reserve_cluster is called | |
282 | * before __ocfs2_flush_truncate_log, dead lock on global bitmap | |
283 | * may happen. | |
284 | * | |
285 | */ | |
286 | ret = ocfs2_reserve_clusters(osb, *len, &context->data_ac); | |
287 | if (ret) { | |
288 | mlog_errno(ret); | |
289 | goto out_unlock_mutex; | |
290 | } | |
291 | ||
202ee5fa TY |
292 | handle = ocfs2_start_trans(osb, credits); |
293 | if (IS_ERR(handle)) { | |
294 | ret = PTR_ERR(handle); | |
295 | mlog_errno(ret); | |
296 | goto out_unlock_mutex; | |
297 | } | |
298 | ||
4dfa66bd | 299 | ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len, |
202ee5fa TY |
300 | &new_phys_cpos, &new_len); |
301 | if (ret) { | |
302 | mlog_errno(ret); | |
303 | goto out_commit; | |
304 | } | |
305 | ||
306 | /* | |
4dfa66bd TY |
307 | * allowing partial extent moving is kind of 'pros and cons', it makes |
308 | * whole defragmentation less likely to fail, on the contrary, the bad | |
309 | * thing is it may make the fs even more fragmented after moving, let | |
310 | * userspace make a good decision here. | |
202ee5fa | 311 | */ |
4dfa66bd TY |
312 | if (new_len != *len) { |
313 | mlog(0, "len_claimed: %u, len: %u\n", new_len, *len); | |
314 | if (!partial) { | |
315 | context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE; | |
316 | ret = -ENOSPC; | |
6194ae42 | 317 | need_free = 1; |
4dfa66bd TY |
318 | goto out_commit; |
319 | } | |
202ee5fa TY |
320 | } |
321 | ||
322 | mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos, | |
323 | phys_cpos, new_phys_cpos); | |
324 | ||
4dfa66bd | 325 | ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos, |
202ee5fa TY |
326 | new_phys_cpos, ext_flags); |
327 | if (ret) | |
328 | mlog_errno(ret); | |
329 | ||
4dfa66bd TY |
330 | if (partial && (new_len != *len)) |
331 | *len = new_len; | |
332 | ||
202ee5fa TY |
333 | /* |
334 | * Here we should write the new page out first if we are | |
335 | * in write-back mode. | |
336 | */ | |
4dfa66bd | 337 | ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len); |
202ee5fa TY |
338 | if (ret) |
339 | mlog_errno(ret); | |
340 | ||
341 | out_commit: | |
6194ae42 LC |
342 | if (need_free && context->data_ac) { |
343 | struct ocfs2_alloc_context *data_ac = context->data_ac; | |
344 | ||
345 | if (context->data_ac->ac_which == OCFS2_AC_USE_LOCAL) | |
346 | ocfs2_free_local_alloc_bits(osb, handle, data_ac, | |
347 | new_phys_cpos, new_len); | |
348 | else | |
349 | ocfs2_free_clusters(handle, | |
350 | data_ac->ac_inode, | |
351 | data_ac->ac_bh, | |
352 | ocfs2_clusters_to_blocks(osb->sb, new_phys_cpos), | |
353 | new_len); | |
354 | } | |
355 | ||
202ee5fa TY |
356 | ocfs2_commit_trans(osb, handle); |
357 | ||
358 | out_unlock_mutex: | |
5955102c | 359 | inode_unlock(tl_inode); |
202ee5fa TY |
360 | |
361 | if (context->data_ac) { | |
362 | ocfs2_free_alloc_context(context->data_ac); | |
363 | context->data_ac = NULL; | |
364 | } | |
365 | ||
366 | if (context->meta_ac) { | |
367 | ocfs2_free_alloc_context(context->meta_ac); | |
368 | context->meta_ac = NULL; | |
369 | } | |
370 | ||
371 | out: | |
372 | if (ref_tree) | |
373 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); | |
374 | ||
375 | return ret; | |
376 | } | |
1c06b912 TY |
377 | |
378 | /* | |
379 | * find the victim alloc group, where #blkno fits. | |
380 | */ | |
381 | static int ocfs2_find_victim_alloc_group(struct inode *inode, | |
382 | u64 vict_blkno, | |
383 | int type, int slot, | |
384 | int *vict_bit, | |
385 | struct buffer_head **ret_bh) | |
386 | { | |
6aea6f50 | 387 | int ret, i, bits_per_unit = 0; |
1c06b912 TY |
388 | u64 blkno; |
389 | char namebuf[40]; | |
390 | ||
391 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
392 | struct buffer_head *ac_bh = NULL, *gd_bh = NULL; | |
393 | struct ocfs2_chain_list *cl; | |
394 | struct ocfs2_chain_rec *rec; | |
395 | struct ocfs2_dinode *ac_dinode; | |
396 | struct ocfs2_group_desc *bg; | |
397 | ||
398 | ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot); | |
399 | ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, | |
400 | strlen(namebuf), &blkno); | |
401 | if (ret) { | |
402 | ret = -ENOENT; | |
403 | goto out; | |
404 | } | |
405 | ||
406 | ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh); | |
407 | if (ret) { | |
408 | mlog_errno(ret); | |
409 | goto out; | |
410 | } | |
411 | ||
412 | ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data; | |
413 | cl = &(ac_dinode->id2.i_chain); | |
414 | rec = &(cl->cl_recs[0]); | |
415 | ||
416 | if (type == GLOBAL_BITMAP_SYSTEM_INODE) | |
6aea6f50 TY |
417 | bits_per_unit = osb->s_clustersize_bits - |
418 | inode->i_sb->s_blocksize_bits; | |
1c06b912 TY |
419 | /* |
420 | * 'vict_blkno' was out of the valid range. | |
421 | */ | |
422 | if ((vict_blkno < le64_to_cpu(rec->c_blkno)) || | |
7fa05c6e | 423 | (vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) << |
6aea6f50 | 424 | bits_per_unit))) { |
1c06b912 TY |
425 | ret = -EINVAL; |
426 | goto out; | |
427 | } | |
428 | ||
429 | for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) { | |
430 | ||
431 | rec = &(cl->cl_recs[i]); | |
432 | if (!rec) | |
433 | continue; | |
434 | ||
435 | bg = NULL; | |
436 | ||
437 | do { | |
438 | if (!bg) | |
439 | blkno = le64_to_cpu(rec->c_blkno); | |
440 | else | |
441 | blkno = le64_to_cpu(bg->bg_next_group); | |
442 | ||
443 | if (gd_bh) { | |
444 | brelse(gd_bh); | |
445 | gd_bh = NULL; | |
446 | } | |
447 | ||
448 | ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh); | |
449 | if (ret) { | |
450 | mlog_errno(ret); | |
451 | goto out; | |
452 | } | |
453 | ||
454 | bg = (struct ocfs2_group_desc *)gd_bh->b_data; | |
455 | ||
456 | if (vict_blkno < (le64_to_cpu(bg->bg_blkno) + | |
457 | le16_to_cpu(bg->bg_bits))) { | |
458 | ||
459 | *ret_bh = gd_bh; | |
6aea6f50 TY |
460 | *vict_bit = (vict_blkno - blkno) >> |
461 | bits_per_unit; | |
1c06b912 TY |
462 | mlog(0, "find the victim group: #%llu, " |
463 | "total_bits: %u, vict_bit: %u\n", | |
464 | blkno, le16_to_cpu(bg->bg_bits), | |
465 | *vict_bit); | |
466 | goto out; | |
467 | } | |
468 | ||
469 | } while (le64_to_cpu(bg->bg_next_group)); | |
470 | } | |
471 | ||
472 | ret = -EINVAL; | |
473 | out: | |
474 | brelse(ac_bh); | |
475 | ||
476 | /* | |
477 | * caller has to release the gd_bh properly. | |
478 | */ | |
479 | return ret; | |
480 | } | |
99e4c750 TY |
481 | |
482 | /* | |
483 | * XXX: helper to validate and adjust moving goal. | |
484 | */ | |
485 | static int ocfs2_validate_and_adjust_move_goal(struct inode *inode, | |
486 | struct ocfs2_move_extents *range) | |
487 | { | |
488 | int ret, goal_bit = 0; | |
489 | ||
490 | struct buffer_head *gd_bh = NULL; | |
7f4804d4 | 491 | struct ocfs2_group_desc *bg; |
99e4c750 TY |
492 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
493 | int c_to_b = 1 << (osb->s_clustersize_bits - | |
494 | inode->i_sb->s_blocksize_bits); | |
495 | ||
ea5e1675 TY |
496 | /* |
497 | * make goal become cluster aligned. | |
498 | */ | |
499 | range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb, | |
500 | range->me_goal); | |
99e4c750 TY |
501 | /* |
502 | * validate goal sits within global_bitmap, and return the victim | |
503 | * group desc | |
504 | */ | |
505 | ret = ocfs2_find_victim_alloc_group(inode, range->me_goal, | |
506 | GLOBAL_BITMAP_SYSTEM_INODE, | |
507 | OCFS2_INVALID_SLOT, | |
508 | &goal_bit, &gd_bh); | |
509 | if (ret) | |
510 | goto out; | |
511 | ||
512 | bg = (struct ocfs2_group_desc *)gd_bh->b_data; | |
513 | ||
7f4804d4 DC |
514 | /* |
515 | * moving goal is not allowd to start with a group desc blok(#0 blk) | |
516 | * let's compromise to the latter cluster. | |
517 | */ | |
518 | if (range->me_goal == le64_to_cpu(bg->bg_blkno)) | |
519 | range->me_goal += c_to_b; | |
520 | ||
99e4c750 TY |
521 | /* |
522 | * movement is not gonna cross two groups. | |
523 | */ | |
524 | if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize < | |
525 | range->me_len) { | |
526 | ret = -EINVAL; | |
527 | goto out; | |
528 | } | |
529 | /* | |
530 | * more exact validations/adjustments will be performed later during | |
531 | * moving operation for each extent range. | |
532 | */ | |
533 | mlog(0, "extents get ready to be moved to #%llu block\n", | |
534 | range->me_goal); | |
535 | ||
536 | out: | |
537 | brelse(gd_bh); | |
538 | ||
539 | return ret; | |
540 | } | |
e6b5859c TY |
541 | |
542 | static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh, | |
543 | int *goal_bit, u32 move_len, u32 max_hop, | |
544 | u32 *phys_cpos) | |
545 | { | |
546 | int i, used, last_free_bits = 0, base_bit = *goal_bit; | |
547 | struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; | |
548 | u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb, | |
549 | le64_to_cpu(gd->bg_blkno)); | |
550 | ||
551 | for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) { | |
552 | ||
553 | used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap); | |
554 | if (used) { | |
555 | /* | |
556 | * we even tried searching the free chunk by jumping | |
557 | * a 'max_hop' distance, but still failed. | |
558 | */ | |
559 | if ((i - base_bit) > max_hop) { | |
560 | *phys_cpos = 0; | |
561 | break; | |
562 | } | |
563 | ||
564 | if (last_free_bits) | |
565 | last_free_bits = 0; | |
566 | ||
567 | continue; | |
568 | } else | |
569 | last_free_bits++; | |
570 | ||
571 | if (last_free_bits == move_len) { | |
572 | *goal_bit = i; | |
573 | *phys_cpos = base_cpos + i; | |
574 | break; | |
575 | } | |
576 | } | |
577 | ||
578 | mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos); | |
579 | } | |
8473aa8a | 580 | |
e0847717 TY |
581 | static int ocfs2_move_extent(struct ocfs2_move_extents_context *context, |
582 | u32 cpos, u32 phys_cpos, u32 *new_phys_cpos, | |
583 | u32 len, int ext_flags) | |
584 | { | |
585 | int ret, credits = 0, extra_blocks = 0, goal_bit = 0; | |
586 | handle_t *handle; | |
587 | struct inode *inode = context->inode; | |
588 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
589 | struct inode *tl_inode = osb->osb_tl_inode; | |
590 | struct inode *gb_inode = NULL; | |
591 | struct buffer_head *gb_bh = NULL; | |
592 | struct buffer_head *gd_bh = NULL; | |
593 | struct ocfs2_group_desc *gd; | |
594 | struct ocfs2_refcount_tree *ref_tree = NULL; | |
595 | u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb, | |
596 | context->range->me_threshold); | |
597 | u64 phys_blkno, new_phys_blkno; | |
598 | ||
599 | phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); | |
600 | ||
601 | if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) { | |
84e40080 | 602 | BUG_ON(!ocfs2_is_refcount_inode(inode)); |
e0847717 TY |
603 | BUG_ON(!context->refcount_loc); |
604 | ||
605 | ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1, | |
606 | &ref_tree, NULL); | |
607 | if (ret) { | |
608 | mlog_errno(ret); | |
609 | return ret; | |
610 | } | |
611 | ||
612 | ret = ocfs2_prepare_refcount_change_for_del(inode, | |
613 | context->refcount_loc, | |
614 | phys_blkno, | |
615 | len, | |
616 | &credits, | |
617 | &extra_blocks); | |
618 | if (ret) { | |
619 | mlog_errno(ret); | |
620 | goto out; | |
621 | } | |
622 | } | |
623 | ||
e21e5744 LC |
624 | ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et, |
625 | len, 1, | |
626 | &context->meta_ac, | |
627 | extra_blocks, &credits); | |
e0847717 TY |
628 | if (ret) { |
629 | mlog_errno(ret); | |
630 | goto out; | |
631 | } | |
632 | ||
633 | /* | |
634 | * need to count 2 extra credits for global_bitmap inode and | |
635 | * group descriptor. | |
636 | */ | |
637 | credits += OCFS2_INODE_UPDATE_CREDITS + 1; | |
638 | ||
639 | /* | |
640 | * ocfs2_move_extent() didn't reserve any clusters in lock_allocators() | |
641 | * logic, while we still need to lock the global_bitmap. | |
642 | */ | |
643 | gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE, | |
644 | OCFS2_INVALID_SLOT); | |
645 | if (!gb_inode) { | |
646 | mlog(ML_ERROR, "unable to get global_bitmap inode\n"); | |
647 | ret = -EIO; | |
648 | goto out; | |
649 | } | |
650 | ||
5955102c | 651 | inode_lock(gb_inode); |
e0847717 TY |
652 | |
653 | ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1); | |
654 | if (ret) { | |
655 | mlog_errno(ret); | |
656 | goto out_unlock_gb_mutex; | |
657 | } | |
658 | ||
5955102c | 659 | inode_lock(tl_inode); |
e0847717 TY |
660 | |
661 | handle = ocfs2_start_trans(osb, credits); | |
662 | if (IS_ERR(handle)) { | |
663 | ret = PTR_ERR(handle); | |
664 | mlog_errno(ret); | |
665 | goto out_unlock_tl_inode; | |
666 | } | |
667 | ||
668 | new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos); | |
669 | ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno, | |
670 | GLOBAL_BITMAP_SYSTEM_INODE, | |
671 | OCFS2_INVALID_SLOT, | |
672 | &goal_bit, &gd_bh); | |
673 | if (ret) { | |
674 | mlog_errno(ret); | |
675 | goto out_commit; | |
676 | } | |
677 | ||
678 | /* | |
679 | * probe the victim cluster group to find a proper | |
680 | * region to fit wanted movement, it even will perfrom | |
681 | * a best-effort attempt by compromising to a threshold | |
682 | * around the goal. | |
683 | */ | |
684 | ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop, | |
685 | new_phys_cpos); | |
3d75be7c | 686 | if (!*new_phys_cpos) { |
e0847717 TY |
687 | ret = -ENOSPC; |
688 | goto out_commit; | |
689 | } | |
690 | ||
691 | ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos, | |
692 | *new_phys_cpos, ext_flags); | |
693 | if (ret) { | |
694 | mlog_errno(ret); | |
695 | goto out_commit; | |
696 | } | |
697 | ||
698 | gd = (struct ocfs2_group_desc *)gd_bh->b_data; | |
699 | ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len, | |
700 | le16_to_cpu(gd->bg_chain)); | |
701 | if (ret) { | |
702 | mlog_errno(ret); | |
703 | goto out_commit; | |
704 | } | |
705 | ||
706 | ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh, | |
707 | goal_bit, len); | |
db66c715 YL |
708 | if (ret) { |
709 | ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len, | |
710 | le16_to_cpu(gd->bg_chain)); | |
e0847717 | 711 | mlog_errno(ret); |
db66c715 | 712 | } |
e0847717 TY |
713 | |
714 | /* | |
715 | * Here we should write the new page out first if we are | |
716 | * in write-back mode. | |
717 | */ | |
718 | ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len); | |
719 | if (ret) | |
720 | mlog_errno(ret); | |
721 | ||
722 | out_commit: | |
723 | ocfs2_commit_trans(osb, handle); | |
724 | brelse(gd_bh); | |
725 | ||
726 | out_unlock_tl_inode: | |
5955102c | 727 | inode_unlock(tl_inode); |
e0847717 TY |
728 | |
729 | ocfs2_inode_unlock(gb_inode, 1); | |
730 | out_unlock_gb_mutex: | |
5955102c | 731 | inode_unlock(gb_inode); |
e0847717 TY |
732 | brelse(gb_bh); |
733 | iput(gb_inode); | |
734 | ||
735 | out: | |
736 | if (context->meta_ac) { | |
737 | ocfs2_free_alloc_context(context->meta_ac); | |
738 | context->meta_ac = NULL; | |
739 | } | |
740 | ||
741 | if (ref_tree) | |
742 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); | |
743 | ||
744 | return ret; | |
745 | } | |
ee16cc03 TY |
746 | |
747 | /* | |
748 | * Helper to calculate the defraging length in one run according to threshold. | |
749 | */ | |
750 | static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged, | |
751 | u32 threshold, int *skip) | |
752 | { | |
753 | if ((*alloc_size + *len_defraged) < threshold) { | |
754 | /* | |
755 | * proceed defragmentation until we meet the thresh | |
756 | */ | |
757 | *len_defraged += *alloc_size; | |
758 | } else if (*len_defraged == 0) { | |
759 | /* | |
760 | * XXX: skip a large extent. | |
761 | */ | |
762 | *skip = 1; | |
763 | } else { | |
764 | /* | |
765 | * split this extent to coalesce with former pieces as | |
766 | * to reach the threshold. | |
767 | * | |
768 | * we're done here with one cycle of defragmentation | |
769 | * in a size of 'thresh', resetting 'len_defraged' | |
770 | * forces a new defragmentation. | |
771 | */ | |
772 | *alloc_size = threshold - *len_defraged; | |
773 | *len_defraged = 0; | |
774 | } | |
775 | } | |
53069d4e TY |
776 | |
777 | static int __ocfs2_move_extents_range(struct buffer_head *di_bh, | |
778 | struct ocfs2_move_extents_context *context) | |
779 | { | |
780 | int ret = 0, flags, do_defrag, skip = 0; | |
781 | u32 cpos, phys_cpos, move_start, len_to_move, alloc_size; | |
782 | u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0; | |
783 | ||
784 | struct inode *inode = context->inode; | |
785 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
786 | struct ocfs2_move_extents *range = context->range; | |
787 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
788 | ||
f17c20dd | 789 | if ((i_size_read(inode) == 0) || (range->me_len == 0)) |
53069d4e TY |
790 | return 0; |
791 | ||
792 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
793 | return 0; | |
794 | ||
795 | context->refcount_loc = le64_to_cpu(di->i_refcount_loc); | |
796 | ||
797 | ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh); | |
798 | ocfs2_init_dealloc_ctxt(&context->dealloc); | |
799 | ||
800 | /* | |
801 | * TO-DO XXX: | |
802 | * | |
803 | * - xattr extents. | |
804 | */ | |
805 | ||
806 | do_defrag = context->auto_defrag; | |
807 | ||
808 | /* | |
809 | * extents moving happens in unit of clusters, for the sake | |
810 | * of simplicity, we may ignore two clusters where 'byte_start' | |
811 | * and 'byte_start + len' were within. | |
812 | */ | |
813 | move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start); | |
814 | len_to_move = (range->me_start + range->me_len) >> | |
815 | osb->s_clustersize_bits; | |
816 | if (len_to_move >= move_start) | |
817 | len_to_move -= move_start; | |
818 | else | |
819 | len_to_move = 0; | |
820 | ||
dda54e76 | 821 | if (do_defrag) { |
53069d4e | 822 | defrag_thresh = range->me_threshold >> osb->s_clustersize_bits; |
dda54e76 TY |
823 | if (defrag_thresh <= 1) |
824 | goto done; | |
825 | } else | |
53069d4e TY |
826 | new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, |
827 | range->me_goal); | |
828 | ||
829 | mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, " | |
830 | "thresh: %u\n", | |
831 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
832 | (unsigned long long)range->me_start, | |
833 | (unsigned long long)range->me_len, | |
834 | move_start, len_to_move, defrag_thresh); | |
835 | ||
836 | cpos = move_start; | |
837 | while (len_to_move) { | |
838 | ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size, | |
839 | &flags); | |
840 | if (ret) { | |
841 | mlog_errno(ret); | |
842 | goto out; | |
843 | } | |
844 | ||
845 | if (alloc_size > len_to_move) | |
846 | alloc_size = len_to_move; | |
847 | ||
848 | /* | |
849 | * XXX: how to deal with a hole: | |
850 | * | |
851 | * - skip the hole of course | |
852 | * - force a new defragmentation | |
853 | */ | |
854 | if (!phys_cpos) { | |
855 | if (do_defrag) | |
856 | len_defraged = 0; | |
857 | ||
858 | goto next; | |
859 | } | |
860 | ||
861 | if (do_defrag) { | |
862 | ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged, | |
863 | defrag_thresh, &skip); | |
864 | /* | |
865 | * skip large extents | |
866 | */ | |
867 | if (skip) { | |
868 | skip = 0; | |
869 | goto next; | |
870 | } | |
871 | ||
872 | mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, " | |
873 | "alloc_size: %u, len_defraged: %u\n", | |
874 | cpos, phys_cpos, alloc_size, len_defraged); | |
875 | ||
876 | ret = ocfs2_defrag_extent(context, cpos, phys_cpos, | |
4dfa66bd | 877 | &alloc_size, flags); |
53069d4e TY |
878 | } else { |
879 | ret = ocfs2_move_extent(context, cpos, phys_cpos, | |
880 | &new_phys_cpos, alloc_size, | |
881 | flags); | |
882 | ||
883 | new_phys_cpos += alloc_size; | |
884 | } | |
885 | ||
886 | if (ret < 0) { | |
887 | mlog_errno(ret); | |
888 | goto out; | |
889 | } | |
890 | ||
891 | context->clusters_moved += alloc_size; | |
892 | next: | |
893 | cpos += alloc_size; | |
894 | len_to_move -= alloc_size; | |
895 | } | |
896 | ||
dda54e76 | 897 | done: |
53069d4e TY |
898 | range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE; |
899 | ||
900 | out: | |
901 | range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb, | |
902 | context->clusters_moved); | |
903 | range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb, | |
904 | context->new_phys_cpos); | |
905 | ||
906 | ocfs2_schedule_truncate_log_flush(osb, 1); | |
907 | ocfs2_run_deallocs(osb, &context->dealloc); | |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
912 | static int ocfs2_move_extents(struct ocfs2_move_extents_context *context) | |
913 | { | |
914 | int status; | |
915 | handle_t *handle; | |
916 | struct inode *inode = context->inode; | |
917 | struct ocfs2_dinode *di; | |
918 | struct buffer_head *di_bh = NULL; | |
919 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
920 | ||
53069d4e TY |
921 | if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) |
922 | return -EROFS; | |
923 | ||
5955102c | 924 | inode_lock(inode); |
53069d4e TY |
925 | |
926 | /* | |
927 | * This prevents concurrent writes from other nodes | |
928 | */ | |
929 | status = ocfs2_rw_lock(inode, 1); | |
930 | if (status) { | |
931 | mlog_errno(status); | |
932 | goto out; | |
933 | } | |
934 | ||
935 | status = ocfs2_inode_lock(inode, &di_bh, 1); | |
936 | if (status) { | |
937 | mlog_errno(status); | |
938 | goto out_rw_unlock; | |
939 | } | |
940 | ||
941 | /* | |
942 | * rememer ip_xattr_sem also needs to be held if necessary | |
943 | */ | |
944 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
945 | ||
946 | status = __ocfs2_move_extents_range(di_bh, context); | |
947 | ||
948 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
949 | if (status) { | |
950 | mlog_errno(status); | |
951 | goto out_inode_unlock; | |
952 | } | |
953 | ||
954 | /* | |
955 | * We update ctime for these changes | |
956 | */ | |
957 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
958 | if (IS_ERR(handle)) { | |
959 | status = PTR_ERR(handle); | |
960 | mlog_errno(status); | |
961 | goto out_inode_unlock; | |
962 | } | |
963 | ||
964 | status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
965 | OCFS2_JOURNAL_ACCESS_WRITE); | |
966 | if (status) { | |
967 | mlog_errno(status); | |
968 | goto out_commit; | |
969 | } | |
970 | ||
971 | di = (struct ocfs2_dinode *)di_bh->b_data; | |
078cd827 | 972 | inode->i_ctime = current_time(inode); |
53069d4e TY |
973 | di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); |
974 | di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); | |
6fdb702d | 975 | ocfs2_update_inode_fsync_trans(handle, inode, 0); |
53069d4e TY |
976 | |
977 | ocfs2_journal_dirty(handle, di_bh); | |
978 | ||
979 | out_commit: | |
980 | ocfs2_commit_trans(osb, handle); | |
981 | ||
982 | out_inode_unlock: | |
983 | brelse(di_bh); | |
984 | ocfs2_inode_unlock(inode, 1); | |
985 | out_rw_unlock: | |
986 | ocfs2_rw_unlock(inode, 1); | |
987 | out: | |
5955102c | 988 | inode_unlock(inode); |
53069d4e TY |
989 | |
990 | return status; | |
991 | } | |
992 | ||
993 | int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp) | |
994 | { | |
995 | int status; | |
996 | ||
496ad9aa | 997 | struct inode *inode = file_inode(filp); |
53069d4e | 998 | struct ocfs2_move_extents range; |
85a258b7 DC |
999 | struct ocfs2_move_extents_context *context; |
1000 | ||
1001 | if (!argp) | |
1002 | return -EINVAL; | |
53069d4e | 1003 | |
a561be71 | 1004 | status = mnt_want_write_file(filp); |
53069d4e TY |
1005 | if (status) |
1006 | return status; | |
1007 | ||
bfbca926 YL |
1008 | if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) { |
1009 | status = -EPERM; | |
85a258b7 | 1010 | goto out_drop; |
bfbca926 | 1011 | } |
53069d4e TY |
1012 | |
1013 | if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) { | |
1014 | status = -EPERM; | |
85a258b7 | 1015 | goto out_drop; |
53069d4e TY |
1016 | } |
1017 | ||
1018 | context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS); | |
1019 | if (!context) { | |
1020 | status = -ENOMEM; | |
1021 | mlog_errno(status); | |
85a258b7 | 1022 | goto out_drop; |
53069d4e TY |
1023 | } |
1024 | ||
1025 | context->inode = inode; | |
1026 | context->file = filp; | |
1027 | ||
85a258b7 DC |
1028 | if (copy_from_user(&range, argp, sizeof(range))) { |
1029 | status = -EFAULT; | |
1030 | goto out_free; | |
53069d4e TY |
1031 | } |
1032 | ||
bfbca926 YL |
1033 | if (range.me_start > i_size_read(inode)) { |
1034 | status = -EINVAL; | |
85a258b7 | 1035 | goto out_free; |
bfbca926 | 1036 | } |
53069d4e TY |
1037 | |
1038 | if (range.me_start + range.me_len > i_size_read(inode)) | |
1039 | range.me_len = i_size_read(inode) - range.me_start; | |
1040 | ||
1041 | context->range = ⦥ | |
1042 | ||
1043 | if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) { | |
1044 | context->auto_defrag = 1; | |
dda54e76 TY |
1045 | /* |
1046 | * ok, the default theshold for the defragmentation | |
1047 | * is 1M, since our maximum clustersize was 1M also. | |
1048 | * any thought? | |
1049 | */ | |
53069d4e | 1050 | if (!range.me_threshold) |
53069d4e | 1051 | range.me_threshold = 1024 * 1024; |
dda54e76 TY |
1052 | |
1053 | if (range.me_threshold > i_size_read(inode)) | |
1054 | range.me_threshold = i_size_read(inode); | |
1055 | ||
4dfa66bd TY |
1056 | if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG) |
1057 | context->partial = 1; | |
53069d4e TY |
1058 | } else { |
1059 | /* | |
1060 | * first best-effort attempt to validate and adjust the goal | |
1061 | * (physical address in block), while it can't guarantee later | |
1062 | * operation can succeed all the time since global_bitmap may | |
1063 | * change a bit over time. | |
1064 | */ | |
1065 | ||
1066 | status = ocfs2_validate_and_adjust_move_goal(inode, &range); | |
1067 | if (status) | |
85a258b7 | 1068 | goto out_copy; |
53069d4e TY |
1069 | } |
1070 | ||
1071 | status = ocfs2_move_extents(context); | |
1072 | if (status) | |
1073 | mlog_errno(status); | |
85a258b7 | 1074 | out_copy: |
53069d4e TY |
1075 | /* |
1076 | * movement/defragmentation may end up being partially completed, | |
1077 | * that's the reason why we need to return userspace the finished | |
1078 | * length and new_offset even if failure happens somewhere. | |
1079 | */ | |
85a258b7 DC |
1080 | if (copy_to_user(argp, &range, sizeof(range))) |
1081 | status = -EFAULT; | |
53069d4e | 1082 | |
85a258b7 | 1083 | out_free: |
53069d4e | 1084 | kfree(context); |
85a258b7 | 1085 | out_drop: |
2a79f17e | 1086 | mnt_drop_write_file(filp); |
53069d4e TY |
1087 | |
1088 | return status; | |
1089 | } |