blob: 849c2f0e0a0e664e983adf61f620abedf87fcb72 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * suballoc.c
5 *
6 * metadata alloc and free
7 * Inspired by ext3 block groups.
8 *
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
25 */
26
27#include <linux/fs.h>
28#include <linux/types.h>
29#include <linux/slab.h>
30#include <linux/highmem.h>
31
32#define MLOG_MASK_PREFIX ML_DISK_ALLOC
33#include <cluster/masklog.h>
34
35#include "ocfs2.h"
36
37#include "alloc.h"
Joel Beckerd6b32bb2008-10-17 14:55:01 -070038#include "blockcheck.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080039#include "dlmglue.h"
40#include "inode.h"
41#include "journal.h"
42#include "localalloc.h"
43#include "suballoc.h"
44#include "super.h"
45#include "sysfile.h"
46#include "uptodate.h"
47
48#include "buffer_head_io.h"
49
Tao Maffda89a2008-03-03 17:12:09 +080050#define NOT_ALLOC_NEW_GROUP 0
Tao Ma60ca81e2009-02-25 00:53:24 +080051#define ALLOC_NEW_GROUP 0x1
52#define ALLOC_GROUPS_FROM_GLOBAL 0x2
Tao Maffda89a2008-03-03 17:12:09 +080053
Tiger Yangb89c5422010-01-25 14:11:06 +080054#define OCFS2_MAX_TO_STEAL 1024
Tao Ma4d0ddb22008-03-05 16:11:46 +080055
Joel Becker7d1fe092010-04-13 14:30:19 +080056struct ocfs2_suballoc_result {
Joel Becker2b6cb572010-03-26 10:09:15 +080057 u64 sr_bg_blkno; /* The bg we allocated from. Set
58 to 0 when a block group is
59 contiguous. */
Mark Fashehe49e2762010-08-13 15:15:17 -070060 u64 sr_bg_stable_blkno; /*
61 * Doesn't change, always
62 * set to target block
63 * group descriptor
64 * block.
65 */
Joel Beckerba206632010-03-26 10:08:59 +080066 u64 sr_blkno; /* The first allocated block */
Joel Becker7d1fe092010-04-13 14:30:19 +080067 unsigned int sr_bit_offset; /* The bit in the bg */
68 unsigned int sr_bits; /* How many bits we claimed */
69};
70
Mark Fashehb2b6ebf2010-08-26 13:06:50 -070071static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
72{
73 if (res->sr_blkno == 0)
74 return 0;
75
76 if (res->sr_bg_blkno)
77 return res->sr_bg_blkno;
78
79 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
80}
81
Mark Fashehccd979b2005-12-15 14:31:24 -080082static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg);
83static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe);
84static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
Mark Fasheh1fabe142006-10-09 18:11:45 -070085static int ocfs2_block_group_fill(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -080086 struct inode *alloc_inode,
87 struct buffer_head *bg_bh,
88 u64 group_blkno,
Joel Becker798db352010-04-13 14:26:32 +080089 unsigned int group_clusters,
Mark Fashehccd979b2005-12-15 14:31:24 -080090 u16 my_chain,
91 struct ocfs2_chain_list *cl);
92static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
93 struct inode *alloc_inode,
Joel Becker1187c962008-09-03 20:03:39 -070094 struct buffer_head *bh,
Tao Ma60ca81e2009-02-25 00:53:24 +080095 u64 max_block,
Tao Mafeb473a2009-02-25 00:53:25 +080096 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +080097 int flags);
Mark Fashehccd979b2005-12-15 14:31:24 -080098
Mark Fashehccd979b2005-12-15 14:31:24 -080099static int ocfs2_cluster_group_search(struct inode *inode,
100 struct buffer_head *group_bh,
101 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -0700102 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +0800103 struct ocfs2_suballoc_result *res);
Mark Fashehccd979b2005-12-15 14:31:24 -0800104static int ocfs2_block_group_search(struct inode *inode,
105 struct buffer_head *group_bh,
106 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -0700107 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +0800108 struct ocfs2_suballoc_result *res);
Joel Beckeraa8f8e92010-03-26 10:08:07 +0800109static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -0700110 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800111 u32 bits_wanted,
112 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +0800113 struct ocfs2_suballoc_result *res);
Mark Fashehccd979b2005-12-15 14:31:24 -0800114static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
115 int nr);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700116static inline int ocfs2_block_group_set_bits(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800117 struct inode *alloc_inode,
118 struct ocfs2_group_desc *bg,
119 struct buffer_head *group_bh,
120 unsigned int bit_off,
121 unsigned int num_bits);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700122static int ocfs2_relink_block_group(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800123 struct inode *alloc_inode,
124 struct buffer_head *fe_bh,
125 struct buffer_head *bg_bh,
126 struct buffer_head *prev_bg_bh,
127 u16 chain);
128static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
129 u32 wanted);
Mark Fashehccd979b2005-12-15 14:31:24 -0800130static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
131 u64 bg_blkno,
132 u16 bg_bit_off);
Mark Fashehccd979b2005-12-15 14:31:24 -0800133static inline void ocfs2_block_to_cluster_group(struct inode *inode,
134 u64 data_blkno,
135 u64 *bg_blkno,
136 u16 *bg_bit_off);
Joel Becker1187c962008-09-03 20:03:39 -0700137static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
138 u32 bits_wanted, u64 max_block,
Tao Ma60ca81e2009-02-25 00:53:24 +0800139 int flags,
Joel Becker1187c962008-09-03 20:03:39 -0700140 struct ocfs2_alloc_context **ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800141
Mark Fasheh9c7af402008-07-28 18:02:53 -0700142void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
Mark Fashehccd979b2005-12-15 14:31:24 -0800143{
Mark Fashehda5cbf22006-10-06 18:34:35 -0700144 struct inode *inode = ac->ac_inode;
145
146 if (inode) {
147 if (ac->ac_which != OCFS2_AC_USE_LOCAL)
Mark Fashehe63aecb62007-10-18 15:30:42 -0700148 ocfs2_inode_unlock(inode, 1);
Mark Fashehda5cbf22006-10-06 18:34:35 -0700149
150 mutex_unlock(&inode->i_mutex);
151
152 iput(inode);
Tao Ma4d0ddb22008-03-05 16:11:46 +0800153 ac->ac_inode = NULL;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700154 }
Mark Fasheha81cb882008-10-07 14:25:16 -0700155 brelse(ac->ac_bh);
156 ac->ac_bh = NULL;
Mark Fashehe3b4a972009-12-07 13:16:07 -0800157 ac->ac_resv = NULL;
Mark Fashehe49e2762010-08-13 15:15:17 -0700158 if (ac->ac_find_loc_priv) {
159 kfree(ac->ac_find_loc_priv);
160 ac->ac_find_loc_priv = NULL;
161 }
Tao Ma4d0ddb22008-03-05 16:11:46 +0800162}
163
164void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
165{
166 ocfs2_free_ac_resource(ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800167 kfree(ac);
168}
169
170static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
171{
172 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
173}
174
Joel Becker57e3e792008-11-13 14:49:13 -0800175#define do_error(fmt, ...) \
176 do{ \
Tao Ma78c37eb2010-03-03 11:26:27 +0800177 if (resize) \
Joel Becker57e3e792008-11-13 14:49:13 -0800178 mlog(ML_ERROR, fmt "\n", ##__VA_ARGS__); \
179 else \
180 ocfs2_error(sb, fmt, ##__VA_ARGS__); \
181 } while (0)
182
Joel Becker970e4932008-11-13 14:49:19 -0800183static int ocfs2_validate_gd_self(struct super_block *sb,
184 struct buffer_head *bh,
Tao Ma78c37eb2010-03-03 11:26:27 +0800185 int resize)
Joel Becker970e4932008-11-13 14:49:19 -0800186{
187 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
188
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700189 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
Joel Becker68f64d42008-11-13 14:49:14 -0800190 do_error("Group descriptor #%llu has bad signature %.*s",
191 (unsigned long long)bh->b_blocknr, 7,
Joel Becker57e3e792008-11-13 14:49:13 -0800192 gd->bg_signature);
193 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700194 }
195
Joel Becker68f64d42008-11-13 14:49:14 -0800196 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
197 do_error("Group descriptor #%llu has an invalid bg_blkno "
198 "of %llu",
199 (unsigned long long)bh->b_blocknr,
200 (unsigned long long)le64_to_cpu(gd->bg_blkno));
201 return -EINVAL;
202 }
203
204 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
205 do_error("Group descriptor #%llu has an invalid "
206 "fs_generation of #%u",
207 (unsigned long long)bh->b_blocknr,
208 le32_to_cpu(gd->bg_generation));
209 return -EINVAL;
210 }
211
Joel Becker970e4932008-11-13 14:49:19 -0800212 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
213 do_error("Group descriptor #%llu has bit count %u but "
214 "claims that %u are free",
215 (unsigned long long)bh->b_blocknr,
216 le16_to_cpu(gd->bg_bits),
217 le16_to_cpu(gd->bg_free_bits_count));
218 return -EINVAL;
219 }
220
221 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
222 do_error("Group descriptor #%llu has bit count %u but "
223 "max bitmap bits of %u",
224 (unsigned long long)bh->b_blocknr,
225 le16_to_cpu(gd->bg_bits),
226 8 * le16_to_cpu(gd->bg_size));
227 return -EINVAL;
228 }
229
230 return 0;
231}
232
233static int ocfs2_validate_gd_parent(struct super_block *sb,
234 struct ocfs2_dinode *di,
235 struct buffer_head *bh,
Tao Ma78c37eb2010-03-03 11:26:27 +0800236 int resize)
Joel Becker970e4932008-11-13 14:49:19 -0800237{
238 unsigned int max_bits;
239 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
240
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700241 if (di->i_blkno != gd->bg_parent_dinode) {
Joel Becker68f64d42008-11-13 14:49:14 -0800242 do_error("Group descriptor #%llu has bad parent "
Joel Becker57e3e792008-11-13 14:49:13 -0800243 "pointer (%llu, expected %llu)",
Joel Becker68f64d42008-11-13 14:49:14 -0800244 (unsigned long long)bh->b_blocknr,
Joel Becker57e3e792008-11-13 14:49:13 -0800245 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
246 (unsigned long long)le64_to_cpu(di->i_blkno));
247 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700248 }
249
250 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
251 if (le16_to_cpu(gd->bg_bits) > max_bits) {
Joel Becker68f64d42008-11-13 14:49:14 -0800252 do_error("Group descriptor #%llu has bit count of %u",
253 (unsigned long long)bh->b_blocknr,
Joel Becker57e3e792008-11-13 14:49:13 -0800254 le16_to_cpu(gd->bg_bits));
255 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700256 }
257
Tao Ma78c37eb2010-03-03 11:26:27 +0800258 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
259 if ((le16_to_cpu(gd->bg_chain) >
260 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
261 ((le16_to_cpu(gd->bg_chain) ==
262 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
Joel Becker68f64d42008-11-13 14:49:14 -0800263 do_error("Group descriptor #%llu has bad chain %u",
264 (unsigned long long)bh->b_blocknr,
Joel Becker57e3e792008-11-13 14:49:13 -0800265 le16_to_cpu(gd->bg_chain));
266 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700267 }
268
Joel Becker970e4932008-11-13 14:49:19 -0800269 return 0;
270}
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700271
Joel Becker57e3e792008-11-13 14:49:13 -0800272#undef do_error
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700273
Joel Becker970e4932008-11-13 14:49:19 -0800274/*
275 * This version only prints errors. It does not fail the filesystem, and
276 * exists only for resize.
277 */
278int ocfs2_check_group_descriptor(struct super_block *sb,
279 struct ocfs2_dinode *di,
280 struct buffer_head *bh)
281{
282 int rc;
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700283 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
Joel Becker970e4932008-11-13 14:49:19 -0800284
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700285 BUG_ON(!buffer_uptodate(bh));
286
287 /*
288 * If the ecc fails, we return the error but otherwise
289 * leave the filesystem running. We know any error is
290 * local to this block.
291 */
292 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
Joel Becker13723d02008-10-17 19:25:01 -0700293 if (rc) {
294 mlog(ML_ERROR,
295 "Checksum failed for group descriptor %llu\n",
296 (unsigned long long)bh->b_blocknr);
297 } else
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700298 rc = ocfs2_validate_gd_self(sb, bh, 1);
Joel Becker970e4932008-11-13 14:49:19 -0800299 if (!rc)
300 rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
301
302 return rc;
303}
304
305static int ocfs2_validate_group_descriptor(struct super_block *sb,
306 struct buffer_head *bh)
307{
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700308 int rc;
309 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
310
Joel Becker970e4932008-11-13 14:49:19 -0800311 mlog(0, "Validating group descriptor %llu\n",
312 (unsigned long long)bh->b_blocknr);
313
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700314 BUG_ON(!buffer_uptodate(bh));
315
316 /*
317 * If the ecc fails, we return the error but otherwise
318 * leave the filesystem running. We know any error is
319 * local to this block.
320 */
321 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
322 if (rc)
323 return rc;
324
325 /*
326 * Errors after here are fatal.
327 */
328
Joel Becker970e4932008-11-13 14:49:19 -0800329 return ocfs2_validate_gd_self(sb, bh, 0);
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700330}
331
Joel Becker68f64d42008-11-13 14:49:14 -0800332int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
333 u64 gd_blkno, struct buffer_head **bh)
334{
335 int rc;
336 struct buffer_head *tmp = *bh;
337
Joel Becker8cb471e2009-02-10 20:00:41 -0800338 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
Joel Becker970e4932008-11-13 14:49:19 -0800339 ocfs2_validate_group_descriptor);
Joel Becker68f64d42008-11-13 14:49:14 -0800340 if (rc)
341 goto out;
342
Joel Becker970e4932008-11-13 14:49:19 -0800343 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
Joel Becker68f64d42008-11-13 14:49:14 -0800344 if (rc) {
345 brelse(tmp);
346 goto out;
347 }
348
349 /* If ocfs2_read_block() got us a new bh, pass it up. */
350 if (!*bh)
351 *bh = tmp;
352
353out:
354 return rc;
355}
356
Joel Becker798db352010-04-13 14:26:32 +0800357static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
358 struct ocfs2_group_desc *bg,
359 struct ocfs2_chain_list *cl,
Tao Ma47dea422010-09-13 15:13:50 +0800360 u64 p_blkno, unsigned int clusters)
Joel Becker798db352010-04-13 14:26:32 +0800361{
362 struct ocfs2_extent_list *el = &bg->bg_list;
363 struct ocfs2_extent_rec *rec;
364
Tao Ma47119542010-04-22 14:09:15 +0800365 BUG_ON(!ocfs2_supports_discontig_bg(osb));
Joel Becker798db352010-04-13 14:26:32 +0800366 if (!el->l_next_free_rec)
367 el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
368 rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
Tao Ma47119542010-04-22 14:09:15 +0800369 rec->e_blkno = cpu_to_le64(p_blkno);
Joel Becker798db352010-04-13 14:26:32 +0800370 rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
371 le16_to_cpu(cl->cl_bpc));
Tao Ma47dea422010-09-13 15:13:50 +0800372 rec->e_leaf_clusters = cpu_to_le16(clusters);
Joel Becker798db352010-04-13 14:26:32 +0800373 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
Tao Ma47119542010-04-22 14:09:15 +0800374 le16_add_cpu(&bg->bg_free_bits_count,
375 clusters * le16_to_cpu(cl->cl_bpc));
Joel Becker798db352010-04-13 14:26:32 +0800376 le16_add_cpu(&el->l_next_free_rec, 1);
377}
378
Mark Fasheh1fabe142006-10-09 18:11:45 -0700379static int ocfs2_block_group_fill(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800380 struct inode *alloc_inode,
381 struct buffer_head *bg_bh,
382 u64 group_blkno,
Joel Becker798db352010-04-13 14:26:32 +0800383 unsigned int group_clusters,
Mark Fashehccd979b2005-12-15 14:31:24 -0800384 u16 my_chain,
385 struct ocfs2_chain_list *cl)
386{
387 int status = 0;
Joel Becker798db352010-04-13 14:26:32 +0800388 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800389 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
390 struct super_block * sb = alloc_inode->i_sb;
391
392 mlog_entry_void();
393
394 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
Mark Fashehb06970532006-03-03 10:24:33 -0800395 ocfs2_error(alloc_inode->i_sb, "group block (%llu) != "
396 "b_blocknr (%llu)",
397 (unsigned long long)group_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -0800398 (unsigned long long) bg_bh->b_blocknr);
399 status = -EIO;
400 goto bail;
401 }
402
Joel Becker13723d02008-10-17 19:25:01 -0700403 status = ocfs2_journal_access_gd(handle,
Joel Becker0cf2f762009-02-12 16:41:25 -0800404 INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -0700405 bg_bh,
406 OCFS2_JOURNAL_ACCESS_CREATE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800407 if (status < 0) {
408 mlog_errno(status);
409 goto bail;
410 }
411
412 memset(bg, 0, sb->s_blocksize);
413 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
414 bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
Tao Ma85718822010-04-13 14:38:06 +0800415 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
416 osb->s_feature_incompat));
Mark Fashehccd979b2005-12-15 14:31:24 -0800417 bg->bg_chain = cpu_to_le16(my_chain);
418 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
419 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
420 bg->bg_blkno = cpu_to_le64(group_blkno);
Joel Becker798db352010-04-13 14:26:32 +0800421 if (group_clusters == le16_to_cpu(cl->cl_cpg))
422 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
423 else
Tao Ma47119542010-04-22 14:09:15 +0800424 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
Joel Becker798db352010-04-13 14:26:32 +0800425 group_clusters);
426
Mark Fashehccd979b2005-12-15 14:31:24 -0800427 /* set the 1st bit in the bitmap to account for the descriptor block */
428 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
429 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
430
Joel Beckerec20cec2010-03-19 14:13:52 -0700431 ocfs2_journal_dirty(handle, bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800432
433 /* There is no need to zero out or otherwise initialize the
434 * other blocks in a group - All valid FS metadata in a block
435 * group stores the superblock fs_generation value at
436 * allocation time. */
437
438bail:
439 mlog_exit(status);
440 return status;
441}
442
443static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
444{
445 u16 curr, best;
446
447 best = curr = 0;
448 while (curr < le16_to_cpu(cl->cl_count)) {
449 if (le32_to_cpu(cl->cl_recs[best].c_total) >
450 le32_to_cpu(cl->cl_recs[curr].c_total))
451 best = curr;
452 curr++;
453 }
454 return best;
455}
456
Joel Becker798db352010-04-13 14:26:32 +0800457static struct buffer_head *
458ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
459 struct inode *alloc_inode,
460 struct ocfs2_alloc_context *ac,
461 struct ocfs2_chain_list *cl)
462{
463 int status;
464 u32 bit_off, num_bits;
465 u64 bg_blkno;
466 struct buffer_head *bg_bh;
467 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
468
Joel Becker1ed9b772010-05-06 13:59:06 +0800469 status = ocfs2_claim_clusters(handle, ac,
Joel Becker798db352010-04-13 14:26:32 +0800470 le16_to_cpu(cl->cl_cpg), &bit_off,
471 &num_bits);
472 if (status < 0) {
473 if (status != -ENOSPC)
474 mlog_errno(status);
475 goto bail;
476 }
477
478 /* setup the group */
479 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
480 mlog(0, "new descriptor, record %u, at block %llu\n",
481 alloc_rec, (unsigned long long)bg_blkno);
482
483 bg_bh = sb_getblk(osb->sb, bg_blkno);
484 if (!bg_bh) {
485 status = -EIO;
486 mlog_errno(status);
487 goto bail;
488 }
489 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
490
491 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
492 bg_blkno, num_bits, alloc_rec, cl);
493 if (status < 0) {
494 brelse(bg_bh);
495 mlog_errno(status);
496 }
497
498bail:
499 return status ? ERR_PTR(status) : bg_bh;
500}
501
502static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
503 handle_t *handle,
504 struct ocfs2_alloc_context *ac,
505 unsigned int min_bits,
506 u32 *bit_off, u32 *num_bits)
507{
Joel Becker18d3a982010-05-18 16:47:55 -0700508 int status = 0;
Joel Becker798db352010-04-13 14:26:32 +0800509
510 while (min_bits) {
Joel Becker1ed9b772010-05-06 13:59:06 +0800511 status = ocfs2_claim_clusters(handle, ac, min_bits,
Joel Becker798db352010-04-13 14:26:32 +0800512 bit_off, num_bits);
513 if (status != -ENOSPC)
514 break;
515
516 min_bits >>= 1;
517 }
518
519 return status;
520}
521
522static int ocfs2_block_group_grow_discontig(handle_t *handle,
523 struct inode *alloc_inode,
524 struct buffer_head *bg_bh,
525 struct ocfs2_alloc_context *ac,
526 struct ocfs2_chain_list *cl,
527 unsigned int min_bits)
528{
529 int status;
530 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
531 struct ocfs2_group_desc *bg =
532 (struct ocfs2_group_desc *)bg_bh->b_data;
Tao Ma47119542010-04-22 14:09:15 +0800533 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
534 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
Joel Becker798db352010-04-13 14:26:32 +0800535 u32 p_cpos, clusters;
536 u64 p_blkno;
537 struct ocfs2_extent_list *el = &bg->bg_list;
538
539 status = ocfs2_journal_access_gd(handle,
540 INODE_CACHE(alloc_inode),
541 bg_bh,
542 OCFS2_JOURNAL_ACCESS_CREATE);
543 if (status < 0) {
544 mlog_errno(status);
545 goto bail;
546 }
547
548 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
549 le16_to_cpu(el->l_count))) {
Joel Becker798db352010-04-13 14:26:32 +0800550 if (min_bits > needed)
551 min_bits = needed;
552 status = ocfs2_block_group_claim_bits(osb, handle, ac,
553 min_bits, &p_cpos,
554 &clusters);
555 if (status < 0) {
556 if (status != -ENOSPC)
557 mlog_errno(status);
558 goto bail;
559 }
560 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
561 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
562 clusters);
563
564 min_bits = clusters;
Tao Ma47119542010-04-22 14:09:15 +0800565 needed = le16_to_cpu(cl->cl_cpg) -
566 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
Joel Becker798db352010-04-13 14:26:32 +0800567 }
568
569 if (needed > 0) {
Tao Ma47119542010-04-22 14:09:15 +0800570 /*
571 * We have used up all the extent rec but can't fill up
572 * the cpg. So bail out.
573 */
574 status = -ENOSPC;
575 goto bail;
Joel Becker798db352010-04-13 14:26:32 +0800576 }
577
578 ocfs2_journal_dirty(handle, bg_bh);
579
580bail:
581 return status;
582}
583
Joel Becker8b06bc52010-03-26 10:09:29 +0800584static void ocfs2_bg_alloc_cleanup(handle_t *handle,
585 struct ocfs2_alloc_context *cluster_ac,
586 struct inode *alloc_inode,
587 struct buffer_head *bg_bh)
Joel Becker798db352010-04-13 14:26:32 +0800588{
Joel Becker8b06bc52010-03-26 10:09:29 +0800589 int i, ret;
Joel Becker798db352010-04-13 14:26:32 +0800590 struct ocfs2_group_desc *bg;
591 struct ocfs2_extent_list *el;
592 struct ocfs2_extent_rec *rec;
593
594 if (!bg_bh)
595 return;
596
597 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
598 el = &bg->bg_list;
599 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
600 rec = &el->l_recs[i];
Joel Becker8b06bc52010-03-26 10:09:29 +0800601 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
602 cluster_ac->ac_bh,
603 le64_to_cpu(rec->e_blkno),
604 le32_to_cpu(rec->e_leaf_clusters));
605 if (ret)
606 mlog_errno(ret);
607 /* Try all the clusters to free */
Joel Becker798db352010-04-13 14:26:32 +0800608 }
609
610 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
611 brelse(bg_bh);
612}
613
614static struct buffer_head *
615ocfs2_block_group_alloc_discontig(handle_t *handle,
616 struct inode *alloc_inode,
617 struct ocfs2_alloc_context *ac,
Joel Becker8b06bc52010-03-26 10:09:29 +0800618 struct ocfs2_chain_list *cl)
Joel Becker798db352010-04-13 14:26:32 +0800619{
620 int status;
621 u32 bit_off, num_bits;
622 u64 bg_blkno;
623 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
624 struct buffer_head *bg_bh = NULL;
625 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
626 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
627
Tao Ma47119542010-04-22 14:09:15 +0800628 if (!ocfs2_supports_discontig_bg(osb)) {
Joel Becker798db352010-04-13 14:26:32 +0800629 status = -ENOSPC;
630 goto bail;
631 }
632
Joel Becker8b06bc52010-03-26 10:09:29 +0800633 status = ocfs2_extend_trans(handle,
634 ocfs2_calc_bg_discontig_credits(osb->sb));
635 if (status) {
636 mlog_errno(status);
637 goto bail;
638 }
639
Joel Becker95ec0ad2010-03-26 10:10:08 +0800640 /*
641 * We're going to be grabbing from multiple cluster groups.
642 * We don't have enough credits to relink them all, and the
643 * cluster groups will be staying in cache for the duration of
644 * this operation.
645 */
646 ac->ac_allow_chain_relink = 0;
647
Joel Becker798db352010-04-13 14:26:32 +0800648 /* Claim the first region */
649 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
650 &bit_off, &num_bits);
651 if (status < 0) {
652 if (status != -ENOSPC)
653 mlog_errno(status);
654 goto bail;
655 }
656 min_bits = num_bits;
657
658 /* setup the group */
659 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
660 mlog(0, "new descriptor, record %u, at block %llu\n",
661 alloc_rec, (unsigned long long)bg_blkno);
662
663 bg_bh = sb_getblk(osb->sb, bg_blkno);
664 if (!bg_bh) {
665 status = -EIO;
666 mlog_errno(status);
667 goto bail;
668 }
669 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
670
671 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
672 bg_blkno, num_bits, alloc_rec, cl);
673 if (status < 0) {
674 mlog_errno(status);
675 goto bail;
676 }
677
678 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
679 bg_bh, ac, cl, min_bits);
680 if (status)
681 mlog_errno(status);
682
683bail:
684 if (status)
Joel Becker8b06bc52010-03-26 10:09:29 +0800685 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
Joel Becker798db352010-04-13 14:26:32 +0800686 return status ? ERR_PTR(status) : bg_bh;
687}
688
Mark Fashehccd979b2005-12-15 14:31:24 -0800689/*
690 * We expect the block group allocator to already be locked.
691 */
692static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
693 struct inode *alloc_inode,
Joel Becker1187c962008-09-03 20:03:39 -0700694 struct buffer_head *bh,
Tao Ma60ca81e2009-02-25 00:53:24 +0800695 u64 max_block,
Tao Mafeb473a2009-02-25 00:53:25 +0800696 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +0800697 int flags)
Mark Fashehccd979b2005-12-15 14:31:24 -0800698{
699 int status, credits;
700 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
701 struct ocfs2_chain_list *cl;
702 struct ocfs2_alloc_context *ac = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700703 handle_t *handle = NULL;
Tao Ma47119542010-04-22 14:09:15 +0800704 u16 alloc_rec;
Mark Fashehccd979b2005-12-15 14:31:24 -0800705 struct buffer_head *bg_bh = NULL;
706 struct ocfs2_group_desc *bg;
707
708 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
709
710 mlog_entry_void();
711
Mark Fashehccd979b2005-12-15 14:31:24 -0800712 cl = &fe->id2.i_chain;
Joel Becker1187c962008-09-03 20:03:39 -0700713 status = ocfs2_reserve_clusters_with_limit(osb,
714 le16_to_cpu(cl->cl_cpg),
Tao Ma60ca81e2009-02-25 00:53:24 +0800715 max_block, flags, &ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800716 if (status < 0) {
717 if (status != -ENOSPC)
718 mlog_errno(status);
719 goto bail;
720 }
721
722 credits = ocfs2_calc_group_alloc_credits(osb->sb,
723 le16_to_cpu(cl->cl_cpg));
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700724 handle = ocfs2_start_trans(osb, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800725 if (IS_ERR(handle)) {
726 status = PTR_ERR(handle);
727 handle = NULL;
728 mlog_errno(status);
729 goto bail;
730 }
731
Tao Mafeb473a2009-02-25 00:53:25 +0800732 if (last_alloc_group && *last_alloc_group != 0) {
733 mlog(0, "use old allocation group %llu for block group alloc\n",
734 (unsigned long long)*last_alloc_group);
735 ac->ac_last_group = *last_alloc_group;
736 }
Joel Becker798db352010-04-13 14:26:32 +0800737
738 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
739 ac, cl);
740 if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
741 bg_bh = ocfs2_block_group_alloc_discontig(handle,
742 alloc_inode,
Joel Becker8b06bc52010-03-26 10:09:29 +0800743 ac, cl);
Joel Becker798db352010-04-13 14:26:32 +0800744 if (IS_ERR(bg_bh)) {
745 status = PTR_ERR(bg_bh);
746 bg_bh = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800747 if (status != -ENOSPC)
748 mlog_errno(status);
749 goto bail;
750 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800751 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
752
Joel Becker0cf2f762009-02-12 16:41:25 -0800753 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -0700754 bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800755 if (status < 0) {
756 mlog_errno(status);
757 goto bail;
758 }
759
Tao Ma47119542010-04-22 14:09:15 +0800760 alloc_rec = le16_to_cpu(bg->bg_chain);
761 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
Mark Fashehccd979b2005-12-15 14:31:24 -0800762 le16_to_cpu(bg->bg_free_bits_count));
Tao Ma47119542010-04-22 14:09:15 +0800763 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
Joel Becker798db352010-04-13 14:26:32 +0800764 le16_to_cpu(bg->bg_bits));
Tao Ma0a463b72010-07-08 11:11:11 +0800765 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -0800766 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
767 le16_add_cpu(&cl->cl_next_free_rec, 1);
768
769 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
770 le16_to_cpu(bg->bg_free_bits_count));
771 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
772 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
773
Joel Beckerec20cec2010-03-19 14:13:52 -0700774 ocfs2_journal_dirty(handle, bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800775
776 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
777 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
778 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
779 le32_to_cpu(fe->i_clusters)));
780 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
781 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
Mark Fasheh8110b072007-03-22 16:53:23 -0700782 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800783
784 status = 0;
Tao Mafeb473a2009-02-25 00:53:25 +0800785
786 /* save the new last alloc group so that the caller can cache it. */
787 if (last_alloc_group)
788 *last_alloc_group = ac->ac_last_group;
789
Mark Fashehccd979b2005-12-15 14:31:24 -0800790bail:
791 if (handle)
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700792 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800793
794 if (ac)
795 ocfs2_free_alloc_context(ac);
796
Mark Fasheha81cb882008-10-07 14:25:16 -0700797 brelse(bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800798
799 mlog_exit(status);
800 return status;
801}
802
803static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
Mark Fashehda5cbf22006-10-06 18:34:35 -0700804 struct ocfs2_alloc_context *ac,
805 int type,
Tao Maffda89a2008-03-03 17:12:09 +0800806 u32 slot,
Tao Mafeb473a2009-02-25 00:53:25 +0800807 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +0800808 int flags)
Mark Fashehccd979b2005-12-15 14:31:24 -0800809{
810 int status;
811 u32 bits_wanted = ac->ac_bits_wanted;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700812 struct inode *alloc_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800813 struct buffer_head *bh = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800814 struct ocfs2_dinode *fe;
815 u32 free_bits;
816
817 mlog_entry_void();
818
Mark Fashehda5cbf22006-10-06 18:34:35 -0700819 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
820 if (!alloc_inode) {
821 mlog_errno(-EINVAL);
822 return -EINVAL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800823 }
824
Mark Fashehda5cbf22006-10-06 18:34:35 -0700825 mutex_lock(&alloc_inode->i_mutex);
826
Mark Fashehe63aecb62007-10-18 15:30:42 -0700827 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
Mark Fashehda5cbf22006-10-06 18:34:35 -0700828 if (status < 0) {
829 mutex_unlock(&alloc_inode->i_mutex);
830 iput(alloc_inode);
831
832 mlog_errno(status);
833 return status;
834 }
835
836 ac->ac_inode = alloc_inode;
Tao Maa4a48912008-03-03 17:12:30 +0800837 ac->ac_alloc_slot = slot;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700838
Mark Fashehccd979b2005-12-15 14:31:24 -0800839 fe = (struct ocfs2_dinode *) bh->b_data;
Joel Becker10995aa2008-11-13 14:49:12 -0800840
841 /* The bh was validated by the inode read inside
842 * ocfs2_inode_lock(). Any corruption is a code bug. */
843 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
844
Mark Fashehccd979b2005-12-15 14:31:24 -0800845 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
Mark Fashehb06970532006-03-03 10:24:33 -0800846 ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator %llu",
847 (unsigned long long)le64_to_cpu(fe->i_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -0800848 status = -EIO;
849 goto bail;
850 }
851
852 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
853 le32_to_cpu(fe->id1.bitmap1.i_used);
854
855 if (bits_wanted > free_bits) {
856 /* cluster bitmap never grows */
857 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
858 mlog(0, "Disk Full: wanted=%u, free_bits=%u\n",
859 bits_wanted, free_bits);
860 status = -ENOSPC;
861 goto bail;
862 }
863
Tao Ma60ca81e2009-02-25 00:53:24 +0800864 if (!(flags & ALLOC_NEW_GROUP)) {
Tao Maffda89a2008-03-03 17:12:09 +0800865 mlog(0, "Alloc File %u Full: wanted=%u, free_bits=%u, "
866 "and we don't alloc a new group for it.\n",
867 slot, bits_wanted, free_bits);
868 status = -ENOSPC;
869 goto bail;
870 }
871
Joel Becker1187c962008-09-03 20:03:39 -0700872 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
Tao Mafeb473a2009-02-25 00:53:25 +0800873 ac->ac_max_block,
874 last_alloc_group, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800875 if (status < 0) {
876 if (status != -ENOSPC)
877 mlog_errno(status);
878 goto bail;
879 }
880 atomic_inc(&osb->alloc_stats.bg_extends);
881
882 /* You should never ask for this much metadata */
883 BUG_ON(bits_wanted >
884 (le32_to_cpu(fe->id1.bitmap1.i_total)
885 - le32_to_cpu(fe->id1.bitmap1.i_used)));
886 }
887
888 get_bh(bh);
889 ac->ac_bh = bh;
890bail:
Mark Fasheha81cb882008-10-07 14:25:16 -0700891 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800892
893 mlog_exit(status);
894 return status;
895}
896
Tiger Yangb89c5422010-01-25 14:11:06 +0800897static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
898{
899 spin_lock(&osb->osb_lock);
900 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
901 spin_unlock(&osb->osb_lock);
902 atomic_set(&osb->s_num_inodes_stolen, 0);
903}
904
905static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
906{
907 spin_lock(&osb->osb_lock);
908 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
909 spin_unlock(&osb->osb_lock);
910 atomic_set(&osb->s_num_meta_stolen, 0);
911}
912
913void ocfs2_init_steal_slots(struct ocfs2_super *osb)
914{
915 ocfs2_init_inode_steal_slot(osb);
916 ocfs2_init_meta_steal_slot(osb);
917}
918
919static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
920{
921 spin_lock(&osb->osb_lock);
922 if (type == INODE_ALLOC_SYSTEM_INODE)
923 osb->s_inode_steal_slot = slot;
924 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
925 osb->s_meta_steal_slot = slot;
926 spin_unlock(&osb->osb_lock);
927}
928
929static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
930{
931 int slot = OCFS2_INVALID_SLOT;
932
933 spin_lock(&osb->osb_lock);
934 if (type == INODE_ALLOC_SYSTEM_INODE)
935 slot = osb->s_inode_steal_slot;
936 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
937 slot = osb->s_meta_steal_slot;
938 spin_unlock(&osb->osb_lock);
939
940 return slot;
941}
942
943static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
944{
945 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
946}
947
948static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
949{
950 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
951}
952
953static int ocfs2_steal_resource(struct ocfs2_super *osb,
954 struct ocfs2_alloc_context *ac,
955 int type)
956{
957 int i, status = -ENOSPC;
958 int slot = __ocfs2_get_steal_slot(osb, type);
959
960 /* Start to steal resource from the first slot after ours. */
961 if (slot == OCFS2_INVALID_SLOT)
962 slot = osb->slot_num + 1;
963
964 for (i = 0; i < osb->max_slots; i++, slot++) {
965 if (slot == osb->max_slots)
966 slot = 0;
967
968 if (slot == osb->slot_num)
969 continue;
970
971 status = ocfs2_reserve_suballoc_bits(osb, ac,
972 type,
973 (u32)slot, NULL,
974 NOT_ALLOC_NEW_GROUP);
975 if (status >= 0) {
976 __ocfs2_set_steal_slot(osb, slot, type);
977 break;
978 }
979
980 ocfs2_free_ac_resource(ac);
981 }
982
983 return status;
984}
985
986static int ocfs2_steal_inode(struct ocfs2_super *osb,
987 struct ocfs2_alloc_context *ac)
988{
989 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
990}
991
992static int ocfs2_steal_meta(struct ocfs2_super *osb,
993 struct ocfs2_alloc_context *ac)
994{
995 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
996}
997
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800998int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
999 int blocks,
1000 struct ocfs2_alloc_context **ac)
Mark Fashehccd979b2005-12-15 14:31:24 -08001001{
1002 int status;
Tiger Yangb89c5422010-01-25 14:11:06 +08001003 int slot = ocfs2_get_meta_steal_slot(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08001004
Robert P. J. Daycd861282006-12-13 00:34:52 -08001005 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001006 if (!(*ac)) {
1007 status = -ENOMEM;
1008 mlog_errno(status);
1009 goto bail;
1010 }
1011
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001012 (*ac)->ac_bits_wanted = blocks;
Mark Fashehccd979b2005-12-15 14:31:24 -08001013 (*ac)->ac_which = OCFS2_AC_USE_META;
Mark Fashehccd979b2005-12-15 14:31:24 -08001014 (*ac)->ac_group_search = ocfs2_block_group_search;
1015
Tiger Yangb89c5422010-01-25 14:11:06 +08001016 if (slot != OCFS2_INVALID_SLOT &&
1017 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
1018 goto extent_steal;
1019
1020 atomic_set(&osb->s_num_meta_stolen, 0);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001021 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
Tao Maffda89a2008-03-03 17:12:09 +08001022 EXTENT_ALLOC_SYSTEM_INODE,
Tiger Yangb89c5422010-01-25 14:11:06 +08001023 (u32)osb->slot_num, NULL,
Mark Fasheh33d5d382010-02-24 13:34:09 -08001024 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
Tiger Yangb89c5422010-01-25 14:11:06 +08001025
1026
1027 if (status >= 0) {
1028 status = 0;
1029 if (slot != OCFS2_INVALID_SLOT)
1030 ocfs2_init_meta_steal_slot(osb);
1031 goto bail;
1032 } else if (status < 0 && status != -ENOSPC) {
1033 mlog_errno(status);
1034 goto bail;
1035 }
1036
1037 ocfs2_free_ac_resource(*ac);
1038
1039extent_steal:
1040 status = ocfs2_steal_meta(osb, *ac);
1041 atomic_inc(&osb->s_num_meta_stolen);
Mark Fashehccd979b2005-12-15 14:31:24 -08001042 if (status < 0) {
1043 if (status != -ENOSPC)
1044 mlog_errno(status);
1045 goto bail;
1046 }
1047
1048 status = 0;
1049bail:
1050 if ((status < 0) && *ac) {
1051 ocfs2_free_alloc_context(*ac);
1052 *ac = NULL;
1053 }
1054
Mark Fashehccd979b2005-12-15 14:31:24 -08001055 mlog_exit(status);
1056 return status;
1057}
1058
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001059int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1060 struct ocfs2_extent_list *root_el,
1061 struct ocfs2_alloc_context **ac)
1062{
1063 return ocfs2_reserve_new_metadata_blocks(osb,
1064 ocfs2_extend_meta_needed(root_el),
1065 ac);
1066}
1067
Mark Fashehccd979b2005-12-15 14:31:24 -08001068int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
Mark Fashehccd979b2005-12-15 14:31:24 -08001069 struct ocfs2_alloc_context **ac)
1070{
1071 int status;
Tiger Yangb89c5422010-01-25 14:11:06 +08001072 int slot = ocfs2_get_inode_steal_slot(osb);
Tao Mafeb473a2009-02-25 00:53:25 +08001073 u64 alloc_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001074
Robert P. J. Daycd861282006-12-13 00:34:52 -08001075 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001076 if (!(*ac)) {
1077 status = -ENOMEM;
1078 mlog_errno(status);
1079 goto bail;
1080 }
1081
1082 (*ac)->ac_bits_wanted = 1;
Mark Fashehccd979b2005-12-15 14:31:24 -08001083 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1084
Mark Fashehccd979b2005-12-15 14:31:24 -08001085 (*ac)->ac_group_search = ocfs2_block_group_search;
1086
Tao Ma4d0ddb22008-03-05 16:11:46 +08001087 /*
Joel Becker1187c962008-09-03 20:03:39 -07001088 * stat(2) can't handle i_ino > 32bits, so we tell the
1089 * lower levels not to allocate us a block group past that
Joel Becker12462f12008-09-03 20:03:40 -07001090 * limit. The 'inode64' mount option avoids this behavior.
Joel Becker1187c962008-09-03 20:03:39 -07001091 */
Joel Becker12462f12008-09-03 20:03:40 -07001092 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1093 (*ac)->ac_max_block = (u32)~0U;
Joel Becker1187c962008-09-03 20:03:39 -07001094
1095 /*
Tao Ma4d0ddb22008-03-05 16:11:46 +08001096 * slot is set when we successfully steal inode from other nodes.
1097 * It is reset in 3 places:
1098 * 1. when we flush the truncate log
1099 * 2. when we complete local alloc recovery.
1100 * 3. when we successfully allocate from our own slot.
1101 * After it is set, we will go on stealing inodes until we find the
1102 * need to check our slots to see whether there is some space for us.
1103 */
1104 if (slot != OCFS2_INVALID_SLOT &&
Tiger Yangb89c5422010-01-25 14:11:06 +08001105 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
Tao Ma4d0ddb22008-03-05 16:11:46 +08001106 goto inode_steal;
1107
1108 atomic_set(&osb->s_num_inodes_stolen, 0);
Tao Mafeb473a2009-02-25 00:53:25 +08001109 alloc_group = osb->osb_inode_alloc_group;
Mark Fashehda5cbf22006-10-06 18:34:35 -07001110 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1111 INODE_ALLOC_SYSTEM_INODE,
Tiger Yangb89c5422010-01-25 14:11:06 +08001112 (u32)osb->slot_num,
Tao Mafeb473a2009-02-25 00:53:25 +08001113 &alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +08001114 ALLOC_NEW_GROUP |
1115 ALLOC_GROUPS_FROM_GLOBAL);
Tao Ma4d0ddb22008-03-05 16:11:46 +08001116 if (status >= 0) {
1117 status = 0;
1118
Tao Mafeb473a2009-02-25 00:53:25 +08001119 spin_lock(&osb->osb_lock);
1120 osb->osb_inode_alloc_group = alloc_group;
1121 spin_unlock(&osb->osb_lock);
1122 mlog(0, "after reservation, new allocation group is "
1123 "%llu\n", (unsigned long long)alloc_group);
1124
Tao Ma4d0ddb22008-03-05 16:11:46 +08001125 /*
1126 * Some inodes must be freed by us, so try to allocate
1127 * from our own next time.
1128 */
1129 if (slot != OCFS2_INVALID_SLOT)
1130 ocfs2_init_inode_steal_slot(osb);
1131 goto bail;
1132 } else if (status < 0 && status != -ENOSPC) {
1133 mlog_errno(status);
1134 goto bail;
1135 }
1136
1137 ocfs2_free_ac_resource(*ac);
1138
1139inode_steal:
Tiger Yangb89c5422010-01-25 14:11:06 +08001140 status = ocfs2_steal_inode(osb, *ac);
Tao Ma4d0ddb22008-03-05 16:11:46 +08001141 atomic_inc(&osb->s_num_inodes_stolen);
Mark Fashehccd979b2005-12-15 14:31:24 -08001142 if (status < 0) {
1143 if (status != -ENOSPC)
1144 mlog_errno(status);
1145 goto bail;
1146 }
1147
1148 status = 0;
1149bail:
1150 if ((status < 0) && *ac) {
1151 ocfs2_free_alloc_context(*ac);
1152 *ac = NULL;
1153 }
1154
Mark Fashehccd979b2005-12-15 14:31:24 -08001155 mlog_exit(status);
1156 return status;
1157}
1158
1159/* local alloc code has to do the same thing, so rather than do this
1160 * twice.. */
1161int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1162 struct ocfs2_alloc_context *ac)
1163{
1164 int status;
1165
Mark Fashehccd979b2005-12-15 14:31:24 -08001166 ac->ac_which = OCFS2_AC_USE_MAIN;
1167 ac->ac_group_search = ocfs2_cluster_group_search;
1168
Mark Fashehda5cbf22006-10-06 18:34:35 -07001169 status = ocfs2_reserve_suballoc_bits(osb, ac,
1170 GLOBAL_BITMAP_SYSTEM_INODE,
Tao Mafeb473a2009-02-25 00:53:25 +08001171 OCFS2_INVALID_SLOT, NULL,
Tao Maffda89a2008-03-03 17:12:09 +08001172 ALLOC_NEW_GROUP);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001173 if (status < 0 && status != -ENOSPC) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001174 mlog_errno(status);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001175 goto bail;
1176 }
1177
Mark Fashehccd979b2005-12-15 14:31:24 -08001178bail:
1179 return status;
1180}
1181
1182/* Callers don't need to care which bitmap (local alloc or main) to
1183 * use so we figure it out for them, but unfortunately this clutters
1184 * things a bit. */
Joel Becker1187c962008-09-03 20:03:39 -07001185static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1186 u32 bits_wanted, u64 max_block,
Tao Ma60ca81e2009-02-25 00:53:24 +08001187 int flags,
Joel Becker1187c962008-09-03 20:03:39 -07001188 struct ocfs2_alloc_context **ac)
Mark Fashehccd979b2005-12-15 14:31:24 -08001189{
1190 int status;
1191
1192 mlog_entry_void();
1193
Robert P. J. Daycd861282006-12-13 00:34:52 -08001194 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001195 if (!(*ac)) {
1196 status = -ENOMEM;
1197 mlog_errno(status);
1198 goto bail;
1199 }
1200
1201 (*ac)->ac_bits_wanted = bits_wanted;
Joel Becker1187c962008-09-03 20:03:39 -07001202 (*ac)->ac_max_block = max_block;
Mark Fashehccd979b2005-12-15 14:31:24 -08001203
1204 status = -ENOSPC;
Tao Ma60ca81e2009-02-25 00:53:24 +08001205 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1206 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001207 status = ocfs2_reserve_local_alloc_bits(osb,
Mark Fashehccd979b2005-12-15 14:31:24 -08001208 bits_wanted,
1209 *ac);
Mark Fasheha57c8fd2010-03-16 21:01:00 -07001210 if ((status < 0) && (status != -ENOSPC)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001211 mlog_errno(status);
1212 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -08001213 }
1214 }
1215
1216 if (status == -ENOSPC) {
1217 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1218 if (status < 0) {
1219 if (status != -ENOSPC)
1220 mlog_errno(status);
1221 goto bail;
1222 }
1223 }
1224
1225 status = 0;
1226bail:
1227 if ((status < 0) && *ac) {
1228 ocfs2_free_alloc_context(*ac);
1229 *ac = NULL;
1230 }
1231
1232 mlog_exit(status);
1233 return status;
1234}
1235
Joel Becker1187c962008-09-03 20:03:39 -07001236int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1237 u32 bits_wanted,
1238 struct ocfs2_alloc_context **ac)
1239{
Tao Ma60ca81e2009-02-25 00:53:24 +08001240 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1241 ALLOC_NEW_GROUP, ac);
Joel Becker1187c962008-09-03 20:03:39 -07001242}
1243
Mark Fashehccd979b2005-12-15 14:31:24 -08001244/*
1245 * More or less lifted from ext3. I'll leave their description below:
1246 *
1247 * "For ext3 allocations, we must not reuse any blocks which are
1248 * allocated in the bitmap buffer's "last committed data" copy. This
1249 * prevents deletes from freeing up the page for reuse until we have
1250 * committed the delete transaction.
1251 *
1252 * If we didn't do this, then deleting something and reallocating it as
1253 * data would allow the old block to be overwritten before the
1254 * transaction committed (because we force data to disk before commit).
1255 * This would lead to corruption if we crashed between overwriting the
1256 * data and committing the delete.
1257 *
1258 * @@@ We may want to make this allocation behaviour conditional on
1259 * data-writes at some point, and disable it for metadata allocations or
1260 * sync-data inodes."
1261 *
1262 * Note: OCFS2 already does this differently for metadata vs data
Joe Perchesc78bad12008-02-03 17:33:42 +02001263 * allocations, as those bitmaps are separate and undo access is never
Mark Fashehccd979b2005-12-15 14:31:24 -08001264 * called on a metadata group descriptor.
1265 */
1266static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1267 int nr)
1268{
1269 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001270 int ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08001271
1272 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1273 return 0;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001274
1275 if (!buffer_jbd(bg_bh))
Mark Fashehccd979b2005-12-15 14:31:24 -08001276 return 1;
1277
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001278 jbd_lock_bh_state(bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001279 bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001280 if (bg)
1281 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1282 else
1283 ret = 1;
1284 jbd_unlock_bh_state(bg_bh);
1285
1286 return ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08001287}
1288
1289static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1290 struct buffer_head *bg_bh,
1291 unsigned int bits_wanted,
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001292 unsigned int total_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001293 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001294{
1295 void *bitmap;
1296 u16 best_offset, best_size;
1297 int offset, start, found, status = 0;
1298 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1299
Joel Becker42035302008-11-13 14:49:15 -08001300 /* Callers got this descriptor from
1301 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1302 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001303
1304 found = start = best_offset = best_size = 0;
1305 bitmap = bg->bg_bitmap;
1306
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001307 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1308 if (offset == total_bits)
Mark Fashehccd979b2005-12-15 14:31:24 -08001309 break;
1310
1311 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1312 /* We found a zero, but we can't use it as it
1313 * hasn't been put to disk yet! */
1314 found = 0;
1315 start = offset + 1;
1316 } else if (offset == start) {
1317 /* we found a zero */
1318 found++;
1319 /* move start to the next bit to test */
1320 start++;
1321 } else {
1322 /* got a zero after some ones */
1323 found = 1;
1324 start = offset + 1;
1325 }
1326 if (found > best_size) {
1327 best_size = found;
1328 best_offset = start - found;
1329 }
1330 /* we got everything we needed */
1331 if (found == bits_wanted) {
1332 /* mlog(0, "Found it all!\n"); */
1333 break;
1334 }
1335 }
1336
Joel Becker7d1fe092010-04-13 14:30:19 +08001337 if (best_size) {
1338 res->sr_bit_offset = best_offset;
1339 res->sr_bits = best_size;
Mark Fashehccd979b2005-12-15 14:31:24 -08001340 } else {
1341 status = -ENOSPC;
1342 /* No error log here -- see the comment above
1343 * ocfs2_test_bg_bit_allocatable */
1344 }
1345
1346 return status;
1347}
1348
Mark Fasheh1fabe142006-10-09 18:11:45 -07001349static inline int ocfs2_block_group_set_bits(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001350 struct inode *alloc_inode,
1351 struct ocfs2_group_desc *bg,
1352 struct buffer_head *group_bh,
1353 unsigned int bit_off,
1354 unsigned int num_bits)
1355{
1356 int status;
1357 void *bitmap = bg->bg_bitmap;
1358 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1359
1360 mlog_entry_void();
1361
Joel Becker42035302008-11-13 14:49:15 -08001362 /* All callers get the descriptor via
1363 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1364 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001365 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1366
1367 mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,
1368 num_bits);
1369
1370 if (ocfs2_is_cluster_bitmap(alloc_inode))
1371 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1372
Joel Becker13723d02008-10-17 19:25:01 -07001373 status = ocfs2_journal_access_gd(handle,
Joel Becker0cf2f762009-02-12 16:41:25 -08001374 INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -07001375 group_bh,
1376 journal_type);
Mark Fashehccd979b2005-12-15 14:31:24 -08001377 if (status < 0) {
1378 mlog_errno(status);
1379 goto bail;
1380 }
1381
1382 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001383 while(num_bits--)
1384 ocfs2_set_bit(bit_off++, bitmap);
1385
Joel Beckerec20cec2010-03-19 14:13:52 -07001386 ocfs2_journal_dirty(handle, group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001387
1388bail:
1389 mlog_exit(status);
1390 return status;
1391}
1392
1393/* find the one with the most empty bits */
1394static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1395{
1396 u16 curr, best;
1397
1398 BUG_ON(!cl->cl_next_free_rec);
1399
1400 best = curr = 0;
1401 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1402 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1403 le32_to_cpu(cl->cl_recs[best].c_free))
1404 best = curr;
1405 curr++;
1406 }
1407
1408 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1409 return best;
1410}
1411
Mark Fasheh1fabe142006-10-09 18:11:45 -07001412static int ocfs2_relink_block_group(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001413 struct inode *alloc_inode,
1414 struct buffer_head *fe_bh,
1415 struct buffer_head *bg_bh,
1416 struct buffer_head *prev_bg_bh,
1417 u16 chain)
1418{
1419 int status;
1420 /* there is a really tiny chance the journal calls could fail,
1421 * but we wouldn't want inconsistent blocks in *any* case. */
1422 u64 fe_ptr, bg_ptr, prev_bg_ptr;
1423 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1424 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1425 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1426
Joel Becker42035302008-11-13 14:49:15 -08001427 /* The caller got these descriptors from
1428 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1429 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1430 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001431
Mark Fashehb06970532006-03-03 10:24:33 -08001432 mlog(0, "Suballoc %llu, chain %u, move group %llu to top, prev = %llu\n",
Mark Fasheh1ca1a112007-04-27 16:01:25 -07001433 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1434 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1435 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -08001436
1437 fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno);
1438 bg_ptr = le64_to_cpu(bg->bg_next_group);
1439 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1440
Joel Becker0cf2f762009-02-12 16:41:25 -08001441 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1442 prev_bg_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001443 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001444 if (status < 0) {
1445 mlog_errno(status);
1446 goto out_rollback;
1447 }
1448
1449 prev_bg->bg_next_group = bg->bg_next_group;
Joel Beckerec20cec2010-03-19 14:13:52 -07001450 ocfs2_journal_dirty(handle, prev_bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001451
Joel Becker0cf2f762009-02-12 16:41:25 -08001452 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1453 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001454 if (status < 0) {
1455 mlog_errno(status);
1456 goto out_rollback;
1457 }
1458
1459 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
Joel Beckerec20cec2010-03-19 14:13:52 -07001460 ocfs2_journal_dirty(handle, bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001461
Joel Becker0cf2f762009-02-12 16:41:25 -08001462 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1463 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001464 if (status < 0) {
1465 mlog_errno(status);
1466 goto out_rollback;
1467 }
1468
1469 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
Joel Beckerec20cec2010-03-19 14:13:52 -07001470 ocfs2_journal_dirty(handle, fe_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001471
Mark Fashehccd979b2005-12-15 14:31:24 -08001472out_rollback:
1473 if (status < 0) {
1474 fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr);
1475 bg->bg_next_group = cpu_to_le64(bg_ptr);
1476 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1477 }
Joel Becker42035302008-11-13 14:49:15 -08001478
Mark Fashehccd979b2005-12-15 14:31:24 -08001479 mlog_exit(status);
1480 return status;
1481}
1482
1483static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1484 u32 wanted)
1485{
1486 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1487}
1488
1489/* return 0 on success, -ENOSPC to keep searching and any other < 0
1490 * value on error. */
1491static int ocfs2_cluster_group_search(struct inode *inode,
1492 struct buffer_head *group_bh,
1493 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -07001494 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +08001495 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001496{
1497 int search = -ENOSPC;
1498 int ret;
Joel Becker1187c962008-09-03 20:03:39 -07001499 u64 blkoff;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001500 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fasheh9c7af402008-07-28 18:02:53 -07001501 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001502 unsigned int max_bits, gd_cluster_off;
Mark Fashehccd979b2005-12-15 14:31:24 -08001503
1504 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1505
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001506 if (gd->bg_free_bits_count) {
1507 max_bits = le16_to_cpu(gd->bg_bits);
1508
1509 /* Tail groups in cluster bitmaps which aren't cpg
1510 * aligned are prone to partial extention by a failed
1511 * fs resize. If the file system resize never got to
1512 * update the dinode cluster count, then we don't want
1513 * to trust any clusters past it, regardless of what
1514 * the group descriptor says. */
1515 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1516 le64_to_cpu(gd->bg_blkno));
1517 if ((gd_cluster_off + max_bits) >
1518 OCFS2_I(inode)->ip_clusters) {
1519 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1520 mlog(0, "Desc %llu, bg_bits %u, clusters %u, use %u\n",
1521 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1522 le16_to_cpu(gd->bg_bits),
1523 OCFS2_I(inode)->ip_clusters, max_bits);
1524 }
1525
Mark Fashehccd979b2005-12-15 14:31:24 -08001526 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1527 group_bh, bits_wanted,
Joel Becker7d1fe092010-04-13 14:30:19 +08001528 max_bits, res);
Mark Fashehccd979b2005-12-15 14:31:24 -08001529 if (ret)
1530 return ret;
1531
Joel Becker1187c962008-09-03 20:03:39 -07001532 if (max_block) {
1533 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1534 gd_cluster_off +
Joel Becker7d1fe092010-04-13 14:30:19 +08001535 res->sr_bit_offset +
1536 res->sr_bits);
Joel Becker1187c962008-09-03 20:03:39 -07001537 mlog(0, "Checking %llu against %llu\n",
1538 (unsigned long long)blkoff,
1539 (unsigned long long)max_block);
1540 if (blkoff > max_block)
1541 return -ENOSPC;
1542 }
1543
Mark Fashehccd979b2005-12-15 14:31:24 -08001544 /* ocfs2_block_group_find_clear_bits() might
1545 * return success, but we still want to return
1546 * -ENOSPC unless it found the minimum number
1547 * of bits. */
Joel Becker7d1fe092010-04-13 14:30:19 +08001548 if (min_bits <= res->sr_bits)
Mark Fashehccd979b2005-12-15 14:31:24 -08001549 search = 0; /* success */
Joel Becker7d1fe092010-04-13 14:30:19 +08001550 else if (res->sr_bits) {
Mark Fasheh9c7af402008-07-28 18:02:53 -07001551 /*
1552 * Don't show bits which we'll be returning
1553 * for allocation to the local alloc bitmap.
1554 */
Joel Becker7d1fe092010-04-13 14:30:19 +08001555 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001556 }
1557 }
1558
1559 return search;
1560}
1561
1562static int ocfs2_block_group_search(struct inode *inode,
1563 struct buffer_head *group_bh,
1564 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -07001565 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +08001566 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001567{
1568 int ret = -ENOSPC;
Joel Becker1187c962008-09-03 20:03:39 -07001569 u64 blkoff;
Mark Fashehccd979b2005-12-15 14:31:24 -08001570 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1571
1572 BUG_ON(min_bits != 1);
1573 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1574
Joel Becker1187c962008-09-03 20:03:39 -07001575 if (bg->bg_free_bits_count) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001576 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1577 group_bh, bits_wanted,
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001578 le16_to_cpu(bg->bg_bits),
Joel Becker7d1fe092010-04-13 14:30:19 +08001579 res);
Joel Becker1187c962008-09-03 20:03:39 -07001580 if (!ret && max_block) {
Joel Becker7d1fe092010-04-13 14:30:19 +08001581 blkoff = le64_to_cpu(bg->bg_blkno) +
1582 res->sr_bit_offset + res->sr_bits;
Joel Becker1187c962008-09-03 20:03:39 -07001583 mlog(0, "Checking %llu against %llu\n",
1584 (unsigned long long)blkoff,
1585 (unsigned long long)max_block);
1586 if (blkoff > max_block)
1587 ret = -ENOSPC;
1588 }
1589 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001590
1591 return ret;
1592}
1593
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001594static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001595 handle_t *handle,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001596 struct buffer_head *di_bh,
1597 u32 num_bits,
1598 u16 chain)
1599{
1600 int ret;
1601 u32 tmp_used;
1602 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1603 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1604
Joel Becker0cf2f762009-02-12 16:41:25 -08001605 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001606 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001607 if (ret < 0) {
1608 mlog_errno(ret);
1609 goto out;
1610 }
1611
1612 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1613 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1614 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
Joel Beckerec20cec2010-03-19 14:13:52 -07001615 ocfs2_journal_dirty(handle, di_bh);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001616
1617out:
1618 return ret;
1619}
1620
Joel Beckerba206632010-03-26 10:08:59 +08001621static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1622 struct ocfs2_extent_rec *rec,
1623 struct ocfs2_chain_list *cl)
Joel Becker13e434c2010-03-26 10:08:27 +08001624{
1625 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1626 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1627 unsigned int bitcount = le32_to_cpu(rec->e_leaf_clusters) * bpc;
1628
1629 if (res->sr_bit_offset < bitoff)
1630 return 0;
1631 if (res->sr_bit_offset >= (bitoff + bitcount))
1632 return 0;
Joel Beckerba206632010-03-26 10:08:59 +08001633 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1634 (res->sr_bit_offset - bitoff);
Joel Becker13e434c2010-03-26 10:08:27 +08001635 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1636 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1637 return 1;
1638}
1639
Joel Beckerba206632010-03-26 10:08:59 +08001640static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1641 struct ocfs2_group_desc *bg,
1642 struct ocfs2_suballoc_result *res)
Joel Becker13e434c2010-03-26 10:08:27 +08001643{
1644 int i;
Joel Becker2b6cb572010-03-26 10:09:15 +08001645 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
Joel Becker13e434c2010-03-26 10:08:27 +08001646 struct ocfs2_extent_rec *rec;
1647 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1648 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1649
Joel Beckerba206632010-03-26 10:08:59 +08001650 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1651 res->sr_blkno = 0;
Joel Becker13e434c2010-03-26 10:08:27 +08001652 return;
Joel Beckerba206632010-03-26 10:08:59 +08001653 }
Joel Becker13e434c2010-03-26 10:08:27 +08001654
Joel Beckerba206632010-03-26 10:08:59 +08001655 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
Joel Becker2b6cb572010-03-26 10:09:15 +08001656 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
Tao Ma47119542010-04-22 14:09:15 +08001657 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
Joel Beckerba206632010-03-26 10:08:59 +08001658 !bg->bg_list.l_next_free_rec)
Joel Becker13e434c2010-03-26 10:08:27 +08001659 return;
1660
1661 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1662 rec = &bg->bg_list.l_recs[i];
Joel Becker2b6cb572010-03-26 10:09:15 +08001663 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1664 res->sr_bg_blkno = bg_blkno; /* Restore */
Joel Becker13e434c2010-03-26 10:08:27 +08001665 break;
Joel Becker2b6cb572010-03-26 10:09:15 +08001666 }
Joel Becker13e434c2010-03-26 10:08:27 +08001667 }
1668}
1669
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001670static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001671 handle_t *handle,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001672 u32 bits_wanted,
1673 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001674 struct ocfs2_suballoc_result *res,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001675 u16 *bits_left)
1676{
1677 int ret;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001678 struct buffer_head *group_bh = NULL;
1679 struct ocfs2_group_desc *gd;
Joel Becker68f64d42008-11-13 14:49:14 -08001680 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001681 struct inode *alloc_inode = ac->ac_inode;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001682
Joel Becker7d1fe092010-04-13 14:30:19 +08001683 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1684 res->sr_bg_blkno, &group_bh);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001685 if (ret < 0) {
1686 mlog_errno(ret);
1687 return ret;
1688 }
1689
1690 gd = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001691 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001692 ac->ac_max_block, res);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001693 if (ret < 0) {
1694 if (ret != -ENOSPC)
1695 mlog_errno(ret);
1696 goto out;
1697 }
1698
Joel Becker13e434c2010-03-26 10:08:27 +08001699 if (!ret)
Joel Beckerba206632010-03-26 10:08:59 +08001700 ocfs2_bg_discontig_fix_result(ac, gd, res);
Joel Becker13e434c2010-03-26 10:08:27 +08001701
Mark Fashehe49e2762010-08-13 15:15:17 -07001702 /*
1703 * sr_bg_blkno might have been changed by
1704 * ocfs2_bg_discontig_fix_result
1705 */
1706 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1707
1708 if (ac->ac_find_loc_only)
1709 goto out_loc_only;
1710
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001711 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001712 res->sr_bits,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001713 le16_to_cpu(gd->bg_chain));
1714 if (ret < 0) {
1715 mlog_errno(ret);
1716 goto out;
1717 }
1718
1719 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001720 res->sr_bit_offset, res->sr_bits);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001721 if (ret < 0)
1722 mlog_errno(ret);
1723
Mark Fashehe49e2762010-08-13 15:15:17 -07001724out_loc_only:
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001725 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1726
1727out:
1728 brelse(group_bh);
1729
1730 return ret;
1731}
1732
Mark Fashehccd979b2005-12-15 14:31:24 -08001733static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001734 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001735 u32 bits_wanted,
1736 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001737 struct ocfs2_suballoc_result *res,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001738 u16 *bits_left)
Mark Fashehccd979b2005-12-15 14:31:24 -08001739{
1740 int status;
Joel Becker7d1fe092010-04-13 14:30:19 +08001741 u16 chain;
Mark Fashehccd979b2005-12-15 14:31:24 -08001742 u64 next_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001743 struct inode *alloc_inode = ac->ac_inode;
1744 struct buffer_head *group_bh = NULL;
1745 struct buffer_head *prev_group_bh = NULL;
1746 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1747 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1748 struct ocfs2_group_desc *bg;
1749
1750 chain = ac->ac_chain;
Mark Fashehb06970532006-03-03 10:24:33 -08001751 mlog(0, "trying to alloc %u bits from chain %u, inode %llu\n",
1752 bits_wanted, chain,
1753 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08001754
Joel Becker68f64d42008-11-13 14:49:14 -08001755 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1756 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1757 &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001758 if (status < 0) {
1759 mlog_errno(status);
1760 goto bail;
1761 }
1762 bg = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -08001763
1764 status = -ENOSPC;
1765 /* for now, the chain search is a bit simplistic. We just use
1766 * the 1st group with any empty bits. */
Joel Becker1187c962008-09-03 20:03:39 -07001767 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1768 bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001769 ac->ac_max_block,
1770 res)) == -ENOSPC) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001771 if (!bg->bg_next_group)
1772 break;
Mark Fasheha81cb882008-10-07 14:25:16 -07001773
1774 brelse(prev_group_bh);
1775 prev_group_bh = NULL;
1776
Mark Fashehccd979b2005-12-15 14:31:24 -08001777 next_group = le64_to_cpu(bg->bg_next_group);
1778 prev_group_bh = group_bh;
1779 group_bh = NULL;
Joel Becker68f64d42008-11-13 14:49:14 -08001780 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1781 next_group, &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001782 if (status < 0) {
1783 mlog_errno(status);
1784 goto bail;
1785 }
1786 bg = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -08001787 }
1788 if (status < 0) {
1789 if (status != -ENOSPC)
1790 mlog_errno(status);
1791 goto bail;
1792 }
1793
Mark Fashehb06970532006-03-03 10:24:33 -08001794 mlog(0, "alloc succeeds: we give %u bits from block group %llu\n",
Joel Becker7d1fe092010-04-13 14:30:19 +08001795 res->sr_bits, (unsigned long long)le64_to_cpu(bg->bg_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -08001796
Joel Becker7d1fe092010-04-13 14:30:19 +08001797 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08001798
Joel Becker7d1fe092010-04-13 14:30:19 +08001799 BUG_ON(res->sr_bits == 0);
Joel Becker13e434c2010-03-26 10:08:27 +08001800 if (!status)
Joel Beckerba206632010-03-26 10:08:59 +08001801 ocfs2_bg_discontig_fix_result(ac, bg, res);
Joel Becker13e434c2010-03-26 10:08:27 +08001802
Mark Fashehe49e2762010-08-13 15:15:17 -07001803 /*
1804 * sr_bg_blkno might have been changed by
1805 * ocfs2_bg_discontig_fix_result
1806 */
1807 res->sr_bg_stable_blkno = group_bh->b_blocknr;
Mark Fashehccd979b2005-12-15 14:31:24 -08001808
1809 /*
1810 * Keep track of previous block descriptor read. When
1811 * we find a target, if we have read more than X
1812 * number of descriptors, and the target is reasonably
1813 * empty, relink him to top of his chain.
1814 *
1815 * We've read 0 extra blocks and only send one more to
1816 * the transaction, yet the next guy to search has a
1817 * much easier time.
1818 *
1819 * Do this *after* figuring out how many bits we're taking out
1820 * of our target group.
1821 */
1822 if (ac->ac_allow_chain_relink &&
1823 (prev_group_bh) &&
Joel Becker7d1fe092010-04-13 14:30:19 +08001824 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001825 status = ocfs2_relink_block_group(handle, alloc_inode,
1826 ac->ac_bh, group_bh,
1827 prev_group_bh, chain);
1828 if (status < 0) {
1829 mlog_errno(status);
1830 goto bail;
1831 }
1832 }
1833
Mark Fashehe49e2762010-08-13 15:15:17 -07001834 if (ac->ac_find_loc_only)
1835 goto out_loc_only;
1836
Mark Fashehd5134982010-08-13 15:15:16 -07001837 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1838 ac->ac_bh, res->sr_bits,
1839 chain);
1840 if (status) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001841 mlog_errno(status);
1842 goto bail;
1843 }
1844
Mark Fashehccd979b2005-12-15 14:31:24 -08001845 status = ocfs2_block_group_set_bits(handle,
1846 alloc_inode,
1847 bg,
1848 group_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001849 res->sr_bit_offset,
1850 res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001851 if (status < 0) {
1852 mlog_errno(status);
1853 goto bail;
1854 }
1855
Joel Becker7d1fe092010-04-13 14:30:19 +08001856 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
Mark Fasheh1ca1a112007-04-27 16:01:25 -07001857 (unsigned long long)le64_to_cpu(fe->i_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -08001858
Mark Fashehe49e2762010-08-13 15:15:17 -07001859out_loc_only:
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001860 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
Mark Fashehccd979b2005-12-15 14:31:24 -08001861bail:
Mark Fasheha81cb882008-10-07 14:25:16 -07001862 brelse(group_bh);
1863 brelse(prev_group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001864
1865 mlog_exit(status);
1866 return status;
1867}
1868
1869/* will give out up to bits_wanted contiguous bits. */
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001870static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001871 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001872 u32 bits_wanted,
1873 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001874 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001875{
1876 int status;
1877 u16 victim, i;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001878 u16 bits_left = 0;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001879 u64 hint = ac->ac_last_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001880 struct ocfs2_chain_list *cl;
1881 struct ocfs2_dinode *fe;
1882
1883 mlog_entry_void();
1884
1885 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1886 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1887 BUG_ON(!ac->ac_bh);
1888
1889 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
Joel Becker10995aa2008-11-13 14:49:12 -08001890
1891 /* The bh was validated by the inode read during
1892 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1893 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1894
Mark Fashehccd979b2005-12-15 14:31:24 -08001895 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1896 le32_to_cpu(fe->id1.bitmap1.i_total)) {
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001897 ocfs2_error(ac->ac_inode->i_sb,
1898 "Chain allocator dinode %llu has %u used "
Mark Fashehb06970532006-03-03 10:24:33 -08001899 "bits but only %u total.",
1900 (unsigned long long)le64_to_cpu(fe->i_blkno),
Mark Fashehccd979b2005-12-15 14:31:24 -08001901 le32_to_cpu(fe->id1.bitmap1.i_used),
1902 le32_to_cpu(fe->id1.bitmap1.i_total));
1903 status = -EIO;
1904 goto bail;
1905 }
1906
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001907 res->sr_bg_blkno = hint;
Joel Becker7d1fe092010-04-13 14:30:19 +08001908 if (res->sr_bg_blkno) {
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001909 /* Attempt to short-circuit the usual search mechanism
1910 * by jumping straight to the most recently used
1911 * allocation group. This helps us mantain some
1912 * contiguousness across allocations. */
Mark Fashehda5cbf22006-10-06 18:34:35 -07001913 status = ocfs2_search_one_group(ac, handle, bits_wanted,
Joel Becker7d1fe092010-04-13 14:30:19 +08001914 min_bits, res, &bits_left);
1915 if (!status)
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001916 goto set_hint;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001917 if (status < 0 && status != -ENOSPC) {
1918 mlog_errno(status);
1919 goto bail;
1920 }
1921 }
1922
Mark Fashehccd979b2005-12-15 14:31:24 -08001923 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1924
1925 victim = ocfs2_find_victim_chain(cl);
1926 ac->ac_chain = victim;
1927 ac->ac_allow_chain_relink = 1;
1928
Joel Becker7d1fe092010-04-13 14:30:19 +08001929 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1930 res, &bits_left);
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001931 if (!status) {
1932 hint = ocfs2_group_from_res(res);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001933 goto set_hint;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001934 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001935 if (status < 0 && status != -ENOSPC) {
1936 mlog_errno(status);
1937 goto bail;
1938 }
1939
1940 mlog(0, "Search of victim chain %u came up with nothing, "
1941 "trying all chains now.\n", victim);
1942
1943 /* If we didn't pick a good victim, then just default to
1944 * searching each chain in order. Don't allow chain relinking
1945 * because we only calculate enough journal credits for one
1946 * relink per alloc. */
1947 ac->ac_allow_chain_relink = 0;
1948 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1949 if (i == victim)
1950 continue;
1951 if (!cl->cl_recs[i].c_free)
1952 continue;
1953
1954 ac->ac_chain = i;
Mark Fashehda5cbf22006-10-06 18:34:35 -07001955 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001956 res, &bits_left);
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001957 if (!status) {
1958 hint = ocfs2_group_from_res(res);
Mark Fashehccd979b2005-12-15 14:31:24 -08001959 break;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001960 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001961 if (status < 0 && status != -ENOSPC) {
1962 mlog_errno(status);
1963 goto bail;
1964 }
1965 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001966
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001967set_hint:
1968 if (status != -ENOSPC) {
1969 /* If the next search of this group is not likely to
1970 * yield a suitable extent, then we reset the last
1971 * group hint so as to not waste a disk read */
1972 if (bits_left < min_bits)
1973 ac->ac_last_group = 0;
1974 else
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001975 ac->ac_last_group = hint;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001976 }
1977
1978bail:
Mark Fashehccd979b2005-12-15 14:31:24 -08001979 mlog_exit(status);
1980 return status;
1981}
1982
Joel Becker1ed9b772010-05-06 13:59:06 +08001983int ocfs2_claim_metadata(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001984 struct ocfs2_alloc_context *ac,
1985 u32 bits_wanted,
Joel Becker2b6cb572010-03-26 10:09:15 +08001986 u64 *suballoc_loc,
Mark Fashehccd979b2005-12-15 14:31:24 -08001987 u16 *suballoc_bit_start,
1988 unsigned int *num_bits,
1989 u64 *blkno_start)
1990{
1991 int status;
Joel Beckerba206632010-03-26 10:08:59 +08001992 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
Mark Fashehccd979b2005-12-15 14:31:24 -08001993
1994 BUG_ON(!ac);
1995 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
1996 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
Mark Fashehccd979b2005-12-15 14:31:24 -08001997
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001998 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07001999 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002000 bits_wanted,
2001 1,
Joel Becker7d1fe092010-04-13 14:30:19 +08002002 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002003 if (status < 0) {
2004 mlog_errno(status);
2005 goto bail;
2006 }
Joel Becker1ed9b772010-05-06 13:59:06 +08002007 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
Mark Fashehccd979b2005-12-15 14:31:24 -08002008
Joel Becker2b6cb572010-03-26 10:09:15 +08002009 *suballoc_loc = res.sr_bg_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002010 *suballoc_bit_start = res.sr_bit_offset;
Joel Beckerba206632010-03-26 10:08:59 +08002011 *blkno_start = res.sr_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002012 ac->ac_bits_given += res.sr_bits;
2013 *num_bits = res.sr_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -08002014 status = 0;
2015bail:
2016 mlog_exit(status);
2017 return status;
2018}
2019
Tao Ma13821152009-02-25 00:53:23 +08002020static void ocfs2_init_inode_ac_group(struct inode *dir,
Tao Maabf1b3c2010-04-27 08:30:36 +08002021 struct buffer_head *parent_di_bh,
Tao Ma13821152009-02-25 00:53:23 +08002022 struct ocfs2_alloc_context *ac)
2023{
Tao Maabf1b3c2010-04-27 08:30:36 +08002024 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
Tao Ma13821152009-02-25 00:53:23 +08002025 /*
2026 * Try to allocate inodes from some specific group.
2027 *
2028 * If the parent dir has recorded the last group used in allocation,
2029 * cool, use it. Otherwise if we try to allocate new inode from the
2030 * same slot the parent dir belongs to, use the same chunk.
2031 *
2032 * We are very careful here to avoid the mistake of setting
2033 * ac_last_group to a group descriptor from a different (unlocked) slot.
2034 */
2035 if (OCFS2_I(dir)->ip_last_used_group &&
2036 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2037 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
Tao Maabf1b3c2010-04-27 08:30:36 +08002038 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2039 if (di->i_suballoc_loc)
2040 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2041 else
2042 ac->ac_last_group = ocfs2_which_suballoc_group(
2043 le64_to_cpu(di->i_blkno),
2044 le16_to_cpu(di->i_suballoc_bit));
2045 }
Tao Ma13821152009-02-25 00:53:23 +08002046}
2047
2048static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2049 struct ocfs2_alloc_context *ac)
2050{
2051 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2052 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2053}
2054
Mark Fashehe49e2762010-08-13 15:15:17 -07002055int ocfs2_find_new_inode_loc(struct inode *dir,
2056 struct buffer_head *parent_fe_bh,
2057 struct ocfs2_alloc_context *ac,
2058 u64 *fe_blkno)
2059{
2060 int ret;
2061 handle_t *handle = NULL;
2062 struct ocfs2_suballoc_result *res;
2063
2064 BUG_ON(!ac);
2065 BUG_ON(ac->ac_bits_given != 0);
2066 BUG_ON(ac->ac_bits_wanted != 1);
2067 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2068
2069 res = kzalloc(sizeof(*res), GFP_NOFS);
2070 if (res == NULL) {
2071 ret = -ENOMEM;
2072 mlog_errno(ret);
2073 goto out;
2074 }
2075
2076 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2077
2078 /*
2079 * The handle started here is for chain relink. Alternatively,
2080 * we could just disable relink for these calls.
2081 */
2082 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2083 if (IS_ERR(handle)) {
2084 ret = PTR_ERR(handle);
2085 handle = NULL;
2086 mlog_errno(ret);
2087 goto out;
2088 }
2089
2090 /*
2091 * This will instruct ocfs2_claim_suballoc_bits and
2092 * ocfs2_search_one_group to search but save actual allocation
2093 * for later.
2094 */
2095 ac->ac_find_loc_only = 1;
2096
2097 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2098 if (ret < 0) {
2099 mlog_errno(ret);
2100 goto out;
2101 }
2102
2103 ac->ac_find_loc_priv = res;
2104 *fe_blkno = res->sr_blkno;
2105
2106out:
2107 if (handle)
2108 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2109
2110 if (ret)
2111 kfree(res);
2112
2113 return ret;
2114}
2115
2116int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2117 struct inode *dir,
2118 struct ocfs2_alloc_context *ac,
2119 u64 *suballoc_loc,
2120 u16 *suballoc_bit,
2121 u64 di_blkno)
2122{
2123 int ret;
2124 u16 chain;
2125 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2126 struct buffer_head *bg_bh = NULL;
2127 struct ocfs2_group_desc *bg;
2128 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2129
2130 /*
2131 * Since di_blkno is being passed back in, we check for any
2132 * inconsistencies which may have happened between
2133 * calls. These are code bugs as di_blkno is not expected to
2134 * change once returned from ocfs2_find_new_inode_loc()
2135 */
2136 BUG_ON(res->sr_blkno != di_blkno);
2137
2138 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2139 res->sr_bg_stable_blkno, &bg_bh);
2140 if (ret) {
2141 mlog_errno(ret);
2142 goto out;
2143 }
2144
2145 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2146 chain = le16_to_cpu(bg->bg_chain);
2147
2148 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2149 ac->ac_bh, res->sr_bits,
2150 chain);
2151 if (ret) {
2152 mlog_errno(ret);
2153 goto out;
2154 }
2155
2156 ret = ocfs2_block_group_set_bits(handle,
2157 ac->ac_inode,
2158 bg,
2159 bg_bh,
2160 res->sr_bit_offset,
2161 res->sr_bits);
2162 if (ret < 0) {
2163 mlog_errno(ret);
2164 goto out;
2165 }
2166
2167 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
2168 (unsigned long long)di_blkno);
2169
2170 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2171
2172 BUG_ON(res->sr_bits != 1);
2173
2174 *suballoc_loc = res->sr_bg_blkno;
2175 *suballoc_bit = res->sr_bit_offset;
2176 ac->ac_bits_given++;
2177 ocfs2_save_inode_ac_group(dir, ac);
2178
2179out:
2180 brelse(bg_bh);
2181
2182 return ret;
2183}
2184
Joel Becker1ed9b772010-05-06 13:59:06 +08002185int ocfs2_claim_new_inode(handle_t *handle,
Tao Ma13821152009-02-25 00:53:23 +08002186 struct inode *dir,
2187 struct buffer_head *parent_fe_bh,
Mark Fashehccd979b2005-12-15 14:31:24 -08002188 struct ocfs2_alloc_context *ac,
Joel Becker2b6cb572010-03-26 10:09:15 +08002189 u64 *suballoc_loc,
Mark Fashehccd979b2005-12-15 14:31:24 -08002190 u16 *suballoc_bit,
2191 u64 *fe_blkno)
2192{
2193 int status;
Joel Becker2b6cb572010-03-26 10:09:15 +08002194 struct ocfs2_suballoc_result res;
Mark Fashehccd979b2005-12-15 14:31:24 -08002195
2196 mlog_entry_void();
2197
2198 BUG_ON(!ac);
2199 BUG_ON(ac->ac_bits_given != 0);
2200 BUG_ON(ac->ac_bits_wanted != 1);
2201 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002202
Tao Ma13821152009-02-25 00:53:23 +08002203 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2204
Joel Beckeraa8f8e92010-03-26 10:08:07 +08002205 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07002206 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002207 1,
2208 1,
Joel Becker7d1fe092010-04-13 14:30:19 +08002209 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002210 if (status < 0) {
2211 mlog_errno(status);
2212 goto bail;
2213 }
Joel Becker1ed9b772010-05-06 13:59:06 +08002214 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
Mark Fashehccd979b2005-12-15 14:31:24 -08002215
Joel Becker7d1fe092010-04-13 14:30:19 +08002216 BUG_ON(res.sr_bits != 1);
Mark Fashehccd979b2005-12-15 14:31:24 -08002217
Joel Becker2b6cb572010-03-26 10:09:15 +08002218 *suballoc_loc = res.sr_bg_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002219 *suballoc_bit = res.sr_bit_offset;
Joel Beckerba206632010-03-26 10:08:59 +08002220 *fe_blkno = res.sr_blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -08002221 ac->ac_bits_given++;
Tao Ma13821152009-02-25 00:53:23 +08002222 ocfs2_save_inode_ac_group(dir, ac);
Mark Fashehccd979b2005-12-15 14:31:24 -08002223 status = 0;
2224bail:
2225 mlog_exit(status);
2226 return status;
2227}
2228
2229/* translate a group desc. blkno and it's bitmap offset into
2230 * disk cluster offset. */
2231static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2232 u64 bg_blkno,
2233 u16 bg_bit_off)
2234{
2235 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2236 u32 cluster = 0;
2237
2238 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2239
2240 if (bg_blkno != osb->first_cluster_group_blkno)
2241 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2242 cluster += (u32) bg_bit_off;
2243 return cluster;
2244}
2245
2246/* given a cluster offset, calculate which block group it belongs to
2247 * and return that block offset. */
Tao Mad6590722007-12-18 15:47:03 +08002248u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
Mark Fashehccd979b2005-12-15 14:31:24 -08002249{
2250 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2251 u32 group_no;
2252
2253 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2254
2255 group_no = cluster / osb->bitmap_cpg;
2256 if (!group_no)
2257 return osb->first_cluster_group_blkno;
2258 return ocfs2_clusters_to_blocks(inode->i_sb,
2259 group_no * osb->bitmap_cpg);
2260}
2261
2262/* given the block number of a cluster start, calculate which cluster
2263 * group and descriptor bitmap offset that corresponds to. */
2264static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2265 u64 data_blkno,
2266 u64 *bg_blkno,
2267 u16 *bg_bit_off)
2268{
2269 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2270 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2271
2272 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2273
2274 *bg_blkno = ocfs2_which_cluster_group(inode,
2275 data_cluster);
2276
2277 if (*bg_blkno == osb->first_cluster_group_blkno)
2278 *bg_bit_off = (u16) data_cluster;
2279 else
2280 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2281 data_blkno - *bg_blkno);
2282}
2283
2284/*
2285 * min_bits - minimum contiguous chunk from this total allocation we
2286 * can handle. set to what we asked for originally for a full
2287 * contig. allocation, set to '1' to indicate we can deal with extents
2288 * of any size.
2289 */
Joel Becker1ed9b772010-05-06 13:59:06 +08002290int __ocfs2_claim_clusters(handle_t *handle,
Mark Fasheh415cb802007-09-16 20:10:16 -07002291 struct ocfs2_alloc_context *ac,
2292 u32 min_clusters,
2293 u32 max_clusters,
2294 u32 *cluster_start,
2295 u32 *num_clusters)
Mark Fashehccd979b2005-12-15 14:31:24 -08002296{
2297 int status;
Mark Fasheh415cb802007-09-16 20:10:16 -07002298 unsigned int bits_wanted = max_clusters;
Joel Beckerba206632010-03-26 10:08:59 +08002299 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
Joel Becker1ed9b772010-05-06 13:59:06 +08002300 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002301
2302 mlog_entry_void();
2303
Mark Fashehccd979b2005-12-15 14:31:24 -08002304 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2305
2306 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2307 && ac->ac_which != OCFS2_AC_USE_MAIN);
Mark Fashehccd979b2005-12-15 14:31:24 -08002308
2309 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
Mark Fasheh33d5d382010-02-24 13:34:09 -08002310 WARN_ON(min_clusters > 1);
2311
Mark Fashehccd979b2005-12-15 14:31:24 -08002312 status = ocfs2_claim_local_alloc_bits(osb,
2313 handle,
2314 ac,
2315 bits_wanted,
2316 cluster_start,
2317 num_clusters);
2318 if (!status)
2319 atomic_inc(&osb->alloc_stats.local_data);
2320 } else {
2321 if (min_clusters > (osb->bitmap_cpg - 1)) {
2322 /* The only paths asking for contiguousness
2323 * should know about this already. */
Sunil Mushran2fbe8d12007-12-20 14:58:11 -08002324 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2325 "group bitmap size %u!\n", min_clusters,
2326 osb->bitmap_cpg);
Mark Fashehccd979b2005-12-15 14:31:24 -08002327 status = -ENOSPC;
2328 goto bail;
2329 }
2330 /* clamp the current request down to a realistic size. */
2331 if (bits_wanted > (osb->bitmap_cpg - 1))
2332 bits_wanted = osb->bitmap_cpg - 1;
2333
Joel Beckeraa8f8e92010-03-26 10:08:07 +08002334 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07002335 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002336 bits_wanted,
2337 min_clusters,
Joel Becker7d1fe092010-04-13 14:30:19 +08002338 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002339 if (!status) {
Joel Beckerba206632010-03-26 10:08:59 +08002340 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
Mark Fashehccd979b2005-12-15 14:31:24 -08002341 *cluster_start =
2342 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
Joel Becker7d1fe092010-04-13 14:30:19 +08002343 res.sr_bg_blkno,
2344 res.sr_bit_offset);
Mark Fashehccd979b2005-12-15 14:31:24 -08002345 atomic_inc(&osb->alloc_stats.bitmap_data);
Tao Ma47119542010-04-22 14:09:15 +08002346 *num_clusters = res.sr_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -08002347 }
2348 }
2349 if (status < 0) {
2350 if (status != -ENOSPC)
2351 mlog_errno(status);
2352 goto bail;
2353 }
2354
Tao Ma47119542010-04-22 14:09:15 +08002355 ac->ac_bits_given += *num_clusters;
Mark Fashehccd979b2005-12-15 14:31:24 -08002356
2357bail:
2358 mlog_exit(status);
2359 return status;
2360}
2361
Joel Becker1ed9b772010-05-06 13:59:06 +08002362int ocfs2_claim_clusters(handle_t *handle,
Mark Fasheh415cb802007-09-16 20:10:16 -07002363 struct ocfs2_alloc_context *ac,
2364 u32 min_clusters,
2365 u32 *cluster_start,
2366 u32 *num_clusters)
2367{
2368 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2369
Joel Becker1ed9b772010-05-06 13:59:06 +08002370 return __ocfs2_claim_clusters(handle, ac, min_clusters,
Mark Fasheh415cb802007-09-16 20:10:16 -07002371 bits_wanted, cluster_start, num_clusters);
2372}
2373
Mark Fashehb4414ee2010-03-11 18:31:09 -08002374static int ocfs2_block_group_clear_bits(handle_t *handle,
2375 struct inode *alloc_inode,
2376 struct ocfs2_group_desc *bg,
2377 struct buffer_head *group_bh,
2378 unsigned int bit_off,
2379 unsigned int num_bits,
2380 void (*undo_fn)(unsigned int bit,
2381 unsigned long *bmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002382{
2383 int status;
2384 unsigned int tmp;
Mark Fashehccd979b2005-12-15 14:31:24 -08002385 struct ocfs2_group_desc *undo_bg = NULL;
2386
2387 mlog_entry_void();
2388
Joel Becker42035302008-11-13 14:49:15 -08002389 /* The caller got this descriptor from
2390 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2391 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08002392
2393 mlog(0, "off = %u, num = %u\n", bit_off, num_bits);
2394
Mark Fashehb4414ee2010-03-11 18:31:09 -08002395 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
Joel Becker0cf2f762009-02-12 16:41:25 -08002396 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
Mark Fashehb4414ee2010-03-11 18:31:09 -08002397 group_bh,
2398 undo_fn ?
2399 OCFS2_JOURNAL_ACCESS_UNDO :
2400 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002401 if (status < 0) {
2402 mlog_errno(status);
2403 goto bail;
2404 }
2405
Mark Fashehb4414ee2010-03-11 18:31:09 -08002406 if (undo_fn) {
Sunil Mushran94e41ec2009-06-19 14:45:54 -07002407 jbd_lock_bh_state(group_bh);
2408 undo_bg = (struct ocfs2_group_desc *)
2409 bh2jh(group_bh)->b_committed_data;
2410 BUG_ON(!undo_bg);
2411 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002412
2413 tmp = num_bits;
2414 while(tmp--) {
2415 ocfs2_clear_bit((bit_off + tmp),
2416 (unsigned long *) bg->bg_bitmap);
Mark Fashehb4414ee2010-03-11 18:31:09 -08002417 if (undo_fn)
2418 undo_fn(bit_off + tmp,
2419 (unsigned long *) undo_bg->bg_bitmap);
Mark Fashehccd979b2005-12-15 14:31:24 -08002420 }
2421 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2422
Mark Fashehb4414ee2010-03-11 18:31:09 -08002423 if (undo_fn)
Sunil Mushran94e41ec2009-06-19 14:45:54 -07002424 jbd_unlock_bh_state(group_bh);
2425
Joel Beckerec20cec2010-03-19 14:13:52 -07002426 ocfs2_journal_dirty(handle, group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002427bail:
2428 return status;
2429}
2430
2431/*
2432 * expects the suballoc inode to already be locked.
2433 */
Mark Fashehb4414ee2010-03-11 18:31:09 -08002434static int _ocfs2_free_suballoc_bits(handle_t *handle,
2435 struct inode *alloc_inode,
2436 struct buffer_head *alloc_bh,
2437 unsigned int start_bit,
2438 u64 bg_blkno,
2439 unsigned int count,
2440 void (*undo_fn)(unsigned int bit,
2441 unsigned long *bitmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002442{
2443 int status = 0;
2444 u32 tmp_used;
Mark Fashehccd979b2005-12-15 14:31:24 -08002445 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2446 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2447 struct buffer_head *group_bh = NULL;
2448 struct ocfs2_group_desc *group;
2449
2450 mlog_entry_void();
2451
Joel Becker10995aa2008-11-13 14:49:12 -08002452 /* The alloc_bh comes from ocfs2_free_dinode() or
2453 * ocfs2_free_clusters(). The callers have all locked the
2454 * allocator and gotten alloc_bh from the lock call. This
2455 * validates the dinode buffer. Any corruption that has happended
2456 * is a code bug. */
2457 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
Mark Fashehccd979b2005-12-15 14:31:24 -08002458 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2459
Mark Fashehb06970532006-03-03 10:24:33 -08002460 mlog(0, "%llu: freeing %u bits from group %llu, starting at %u\n",
2461 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, count,
2462 (unsigned long long)bg_blkno, start_bit);
Mark Fashehccd979b2005-12-15 14:31:24 -08002463
Joel Becker68f64d42008-11-13 14:49:14 -08002464 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2465 &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002466 if (status < 0) {
2467 mlog_errno(status);
2468 goto bail;
2469 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002470 group = (struct ocfs2_group_desc *) group_bh->b_data;
Joel Becker68f64d42008-11-13 14:49:14 -08002471
Mark Fashehccd979b2005-12-15 14:31:24 -08002472 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2473
2474 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2475 group, group_bh,
Mark Fashehb4414ee2010-03-11 18:31:09 -08002476 start_bit, count, undo_fn);
Mark Fashehccd979b2005-12-15 14:31:24 -08002477 if (status < 0) {
2478 mlog_errno(status);
2479 goto bail;
2480 }
2481
Joel Becker0cf2f762009-02-12 16:41:25 -08002482 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2483 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002484 if (status < 0) {
2485 mlog_errno(status);
2486 goto bail;
2487 }
2488
2489 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2490 count);
2491 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2492 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
Joel Beckerec20cec2010-03-19 14:13:52 -07002493 ocfs2_journal_dirty(handle, alloc_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002494
2495bail:
Mark Fasheha81cb882008-10-07 14:25:16 -07002496 brelse(group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002497
2498 mlog_exit(status);
2499 return status;
2500}
2501
Mark Fashehb4414ee2010-03-11 18:31:09 -08002502int ocfs2_free_suballoc_bits(handle_t *handle,
2503 struct inode *alloc_inode,
2504 struct buffer_head *alloc_bh,
2505 unsigned int start_bit,
2506 u64 bg_blkno,
2507 unsigned int count)
2508{
2509 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2510 start_bit, bg_blkno, count, NULL);
2511}
2512
Mark Fasheh1fabe142006-10-09 18:11:45 -07002513int ocfs2_free_dinode(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002514 struct inode *inode_alloc_inode,
2515 struct buffer_head *inode_alloc_bh,
2516 struct ocfs2_dinode *di)
2517{
2518 u64 blk = le64_to_cpu(di->i_blkno);
2519 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2520 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2521
Tao Ma74380c42010-03-22 14:20:18 +08002522 if (di->i_suballoc_loc)
2523 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
Mark Fashehccd979b2005-12-15 14:31:24 -08002524 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2525 inode_alloc_bh, bit, bg_blkno, 1);
2526}
2527
Mark Fashehb4414ee2010-03-11 18:31:09 -08002528static int _ocfs2_free_clusters(handle_t *handle,
2529 struct inode *bitmap_inode,
2530 struct buffer_head *bitmap_bh,
2531 u64 start_blk,
2532 unsigned int num_clusters,
2533 void (*undo_fn)(unsigned int bit,
2534 unsigned long *bitmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002535{
2536 int status;
2537 u16 bg_start_bit;
2538 u64 bg_blkno;
2539 struct ocfs2_dinode *fe;
2540
2541 /* You can't ever have a contiguous set of clusters
2542 * bigger than a block group bitmap so we never have to worry
2543 * about looping on them. */
2544
2545 mlog_entry_void();
2546
2547 /* This is expensive. We can safely remove once this stuff has
2548 * gotten tested really well. */
2549 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk)));
2550
2551 fe = (struct ocfs2_dinode *) bitmap_bh->b_data;
2552
2553 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2554 &bg_start_bit);
2555
Mark Fashehb06970532006-03-03 10:24:33 -08002556 mlog(0, "want to free %u clusters starting at block %llu\n",
2557 num_clusters, (unsigned long long)start_blk);
2558 mlog(0, "bg_blkno = %llu, bg_start_bit = %u\n",
2559 (unsigned long long)bg_blkno, bg_start_bit);
Mark Fashehccd979b2005-12-15 14:31:24 -08002560
Mark Fashehb4414ee2010-03-11 18:31:09 -08002561 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2562 bg_start_bit, bg_blkno,
2563 num_clusters, undo_fn);
Mark Fasheh9c7af402008-07-28 18:02:53 -07002564 if (status < 0) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002565 mlog_errno(status);
Mark Fasheh9c7af402008-07-28 18:02:53 -07002566 goto out;
2567 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002568
Mark Fasheh9c7af402008-07-28 18:02:53 -07002569 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2570 num_clusters);
2571
2572out:
Mark Fashehccd979b2005-12-15 14:31:24 -08002573 mlog_exit(status);
2574 return status;
2575}
2576
Mark Fashehb4414ee2010-03-11 18:31:09 -08002577int ocfs2_free_clusters(handle_t *handle,
2578 struct inode *bitmap_inode,
2579 struct buffer_head *bitmap_bh,
2580 u64 start_blk,
2581 unsigned int num_clusters)
2582{
2583 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2584 start_blk, num_clusters,
2585 _ocfs2_set_bit);
2586}
2587
2588/*
2589 * Give never-used clusters back to the global bitmap. We don't need
2590 * to protect these bits in the undo buffer.
2591 */
2592int ocfs2_release_clusters(handle_t *handle,
2593 struct inode *bitmap_inode,
2594 struct buffer_head *bitmap_bh,
2595 u64 start_blk,
2596 unsigned int num_clusters)
2597{
2598 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2599 start_blk, num_clusters,
2600 _ocfs2_clear_bit);
2601}
2602
Mark Fashehccd979b2005-12-15 14:31:24 -08002603static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg)
2604{
2605 printk("Block Group:\n");
2606 printk("bg_signature: %s\n", bg->bg_signature);
2607 printk("bg_size: %u\n", bg->bg_size);
2608 printk("bg_bits: %u\n", bg->bg_bits);
2609 printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count);
2610 printk("bg_chain: %u\n", bg->bg_chain);
2611 printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation));
Mark Fashehb06970532006-03-03 10:24:33 -08002612 printk("bg_next_group: %llu\n",
2613 (unsigned long long)bg->bg_next_group);
2614 printk("bg_parent_dinode: %llu\n",
2615 (unsigned long long)bg->bg_parent_dinode);
2616 printk("bg_blkno: %llu\n",
2617 (unsigned long long)bg->bg_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002618}
2619
2620static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
2621{
2622 int i;
2623
Mark Fashehb06970532006-03-03 10:24:33 -08002624 printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002625 printk("i_signature: %s\n", fe->i_signature);
Mark Fashehb06970532006-03-03 10:24:33 -08002626 printk("i_size: %llu\n",
2627 (unsigned long long)fe->i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -08002628 printk("i_clusters: %u\n", fe->i_clusters);
2629 printk("i_generation: %u\n",
2630 le32_to_cpu(fe->i_generation));
2631 printk("id1.bitmap1.i_used: %u\n",
2632 le32_to_cpu(fe->id1.bitmap1.i_used));
2633 printk("id1.bitmap1.i_total: %u\n",
2634 le32_to_cpu(fe->id1.bitmap1.i_total));
2635 printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg);
2636 printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc);
2637 printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count);
2638 printk("id2.i_chain.cl_next_free_rec: %u\n",
2639 fe->id2.i_chain.cl_next_free_rec);
2640 for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) {
2641 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i,
2642 fe->id2.i_chain.cl_recs[i].c_free);
2643 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i,
2644 fe->id2.i_chain.cl_recs[i].c_total);
Mark Fashehb06970532006-03-03 10:24:33 -08002645 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i,
2646 (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002647 }
2648}
Tao Mae7d4cb62008-08-18 17:38:44 +08002649
2650/*
2651 * For a given allocation, determine which allocators will need to be
2652 * accessed, and lock them, reserving the appropriate number of bits.
2653 *
2654 * Sparse file systems call this from ocfs2_write_begin_nolock()
2655 * and ocfs2_allocate_unwritten_extents().
2656 *
2657 * File systems which don't support holes call this from
2658 * ocfs2_extend_allocation().
2659 */
Joel Beckerf99b9b72008-08-20 19:36:33 -07002660int ocfs2_lock_allocators(struct inode *inode,
2661 struct ocfs2_extent_tree *et,
Tao Mae7d4cb62008-08-18 17:38:44 +08002662 u32 clusters_to_add, u32 extents_to_split,
2663 struct ocfs2_alloc_context **data_ac,
Joel Beckerf99b9b72008-08-20 19:36:33 -07002664 struct ocfs2_alloc_context **meta_ac)
Tao Mae7d4cb62008-08-18 17:38:44 +08002665{
2666 int ret = 0, num_free_extents;
2667 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2668 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2669
2670 *meta_ac = NULL;
2671 if (data_ac)
2672 *data_ac = NULL;
2673
2674 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2675
Joel Becker3d03a302009-02-12 17:49:26 -08002676 num_free_extents = ocfs2_num_free_extents(osb, et);
Tao Mae7d4cb62008-08-18 17:38:44 +08002677 if (num_free_extents < 0) {
2678 ret = num_free_extents;
2679 mlog_errno(ret);
2680 goto out;
2681 }
2682
2683 /*
2684 * Sparse allocation file systems need to be more conservative
2685 * with reserving room for expansion - the actual allocation
2686 * happens while we've got a journal handle open so re-taking
2687 * a cluster lock (because we ran out of room for another
2688 * extent) will violate ordering rules.
2689 *
2690 * Most of the time we'll only be seeing this 1 cluster at a time
2691 * anyway.
2692 *
2693 * Always lock for any unwritten extents - we might want to
2694 * add blocks during a split.
2695 */
2696 if (!num_free_extents ||
2697 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
Joel Beckerf99b9b72008-08-20 19:36:33 -07002698 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
Tao Mae7d4cb62008-08-18 17:38:44 +08002699 if (ret < 0) {
2700 if (ret != -ENOSPC)
2701 mlog_errno(ret);
2702 goto out;
2703 }
2704 }
2705
2706 if (clusters_to_add == 0)
2707 goto out;
2708
2709 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2710 if (ret < 0) {
2711 if (ret != -ENOSPC)
2712 mlog_errno(ret);
2713 goto out;
2714 }
2715
2716out:
2717 if (ret) {
2718 if (*meta_ac) {
2719 ocfs2_free_alloc_context(*meta_ac);
2720 *meta_ac = NULL;
2721 }
2722
2723 /*
2724 * We cannot have an error and a non null *data_ac.
2725 */
2726 }
2727
2728 return ret;
2729}
wengang wang6ca497a2009-03-06 21:29:10 +08002730
2731/*
2732 * Read the inode specified by blkno to get suballoc_slot and
2733 * suballoc_bit.
2734 */
2735static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
Tao Ma889f0042010-09-02 13:10:10 +08002736 u16 *suballoc_slot, u64 *group_blkno,
2737 u16 *suballoc_bit)
wengang wang6ca497a2009-03-06 21:29:10 +08002738{
2739 int status;
2740 struct buffer_head *inode_bh = NULL;
2741 struct ocfs2_dinode *inode_fe;
2742
Joel Becker5b09b502009-04-21 16:31:20 -07002743 mlog_entry("blkno: %llu\n", (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002744
2745 /* dirty read disk */
2746 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2747 if (status < 0) {
Joel Becker5b09b502009-04-21 16:31:20 -07002748 mlog(ML_ERROR, "read block %llu failed %d\n",
2749 (unsigned long long)blkno, status);
wengang wang6ca497a2009-03-06 21:29:10 +08002750 goto bail;
2751 }
2752
2753 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2754 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
Joel Becker5b09b502009-04-21 16:31:20 -07002755 mlog(ML_ERROR, "invalid inode %llu requested\n",
2756 (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002757 status = -EINVAL;
2758 goto bail;
2759 }
2760
Tao Ma0fba8132009-03-19 05:08:43 +08002761 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
wengang wang6ca497a2009-03-06 21:29:10 +08002762 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2763 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
Joel Becker5b09b502009-04-21 16:31:20 -07002764 (unsigned long long)blkno,
2765 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
wengang wang6ca497a2009-03-06 21:29:10 +08002766 status = -EINVAL;
2767 goto bail;
2768 }
2769
2770 if (suballoc_slot)
2771 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2772 if (suballoc_bit)
2773 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
Tao Ma889f0042010-09-02 13:10:10 +08002774 if (group_blkno)
2775 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
wengang wang6ca497a2009-03-06 21:29:10 +08002776
2777bail:
2778 brelse(inode_bh);
2779
2780 mlog_exit(status);
2781 return status;
2782}
2783
2784/*
2785 * test whether bit is SET in allocator bitmap or not. on success, 0
2786 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2787 * is returned and *res is meaningless. Call this after you have
2788 * cluster locked against suballoc, or you may get a result based on
2789 * non-up2date contents
2790 */
2791static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2792 struct inode *suballoc,
Tao Ma889f0042010-09-02 13:10:10 +08002793 struct buffer_head *alloc_bh,
2794 u64 group_blkno, u64 blkno,
wengang wang6ca497a2009-03-06 21:29:10 +08002795 u16 bit, int *res)
2796{
Tao Maabf1b3c2010-04-27 08:30:36 +08002797 struct ocfs2_dinode *alloc_di;
wengang wang6ca497a2009-03-06 21:29:10 +08002798 struct ocfs2_group_desc *group;
2799 struct buffer_head *group_bh = NULL;
2800 u64 bg_blkno;
2801 int status;
2802
Joel Becker5b09b502009-04-21 16:31:20 -07002803 mlog_entry("blkno: %llu bit: %u\n", (unsigned long long)blkno,
2804 (unsigned int)bit);
wengang wang6ca497a2009-03-06 21:29:10 +08002805
Tao Maabf1b3c2010-04-27 08:30:36 +08002806 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2807 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
wengang wang6ca497a2009-03-06 21:29:10 +08002808 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2809 (unsigned int)bit,
Tao Maabf1b3c2010-04-27 08:30:36 +08002810 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
wengang wang6ca497a2009-03-06 21:29:10 +08002811 status = -EINVAL;
2812 goto bail;
2813 }
2814
Tao Ma889f0042010-09-02 13:10:10 +08002815 bg_blkno = group_blkno ? group_blkno :
2816 ocfs2_which_suballoc_group(blkno, bit);
Tao Maabf1b3c2010-04-27 08:30:36 +08002817 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
wengang wang6ca497a2009-03-06 21:29:10 +08002818 &group_bh);
2819 if (status < 0) {
Joel Becker5b09b502009-04-21 16:31:20 -07002820 mlog(ML_ERROR, "read group %llu failed %d\n",
2821 (unsigned long long)bg_blkno, status);
wengang wang6ca497a2009-03-06 21:29:10 +08002822 goto bail;
2823 }
2824
2825 group = (struct ocfs2_group_desc *) group_bh->b_data;
2826 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2827
2828bail:
2829 brelse(group_bh);
2830
2831 mlog_exit(status);
2832 return status;
2833}
2834
2835/*
2836 * Test if the bit representing this inode (blkno) is set in the
2837 * suballocator.
2838 *
2839 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2840 *
2841 * In the event of failure, a negative value is returned and *res is
2842 * meaningless.
2843 *
2844 * Callers must make sure to hold nfs_sync_lock to prevent
2845 * ocfs2_delete_inode() on another node from accessing the same
2846 * suballocator concurrently.
2847 */
2848int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2849{
2850 int status;
Tao Ma889f0042010-09-02 13:10:10 +08002851 u64 group_blkno = 0;
wengang wang6ca497a2009-03-06 21:29:10 +08002852 u16 suballoc_bit = 0, suballoc_slot = 0;
2853 struct inode *inode_alloc_inode;
2854 struct buffer_head *alloc_bh = NULL;
2855
Joel Becker5b09b502009-04-21 16:31:20 -07002856 mlog_entry("blkno: %llu", (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002857
2858 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
Tao Ma889f0042010-09-02 13:10:10 +08002859 &group_blkno, &suballoc_bit);
wengang wang6ca497a2009-03-06 21:29:10 +08002860 if (status < 0) {
2861 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2862 goto bail;
2863 }
2864
2865 inode_alloc_inode =
2866 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
2867 suballoc_slot);
2868 if (!inode_alloc_inode) {
2869 /* the error code could be inaccurate, but we are not able to
2870 * get the correct one. */
2871 status = -EINVAL;
2872 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2873 (u32)suballoc_slot);
2874 goto bail;
2875 }
2876
2877 mutex_lock(&inode_alloc_inode->i_mutex);
2878 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2879 if (status < 0) {
2880 mutex_unlock(&inode_alloc_inode->i_mutex);
2881 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2882 (u32)suballoc_slot, status);
2883 goto bail;
2884 }
2885
2886 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
Tao Ma889f0042010-09-02 13:10:10 +08002887 group_blkno, blkno, suballoc_bit, res);
wengang wang6ca497a2009-03-06 21:29:10 +08002888 if (status < 0)
2889 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2890
2891 ocfs2_inode_unlock(inode_alloc_inode, 0);
2892 mutex_unlock(&inode_alloc_inode->i_mutex);
2893
2894 iput(inode_alloc_inode);
2895 brelse(alloc_bh);
2896bail:
2897 mlog_exit(status);
2898 return status;
2899}