blob: 5397c07ce6080b8f6e3c5917225eba98a070a4ba [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
Mark Fashehccd979b2005-12-15 14:31:24 -080032#include <cluster/masklog.h>
33
34#include "ocfs2.h"
35
36#include "alloc.h"
Joel Beckerd6b32bb2008-10-17 14:55:01 -070037#include "blockcheck.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080038#include "dlmglue.h"
39#include "inode.h"
40#include "journal.h"
41#include "localalloc.h"
42#include "suballoc.h"
43#include "super.h"
44#include "sysfile.h"
45#include "uptodate.h"
Tao Ma2f73e132011-02-22 08:22:33 +080046#include "ocfs2_trace.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080047
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
Tao Ma2f73e132011-02-22 08:22:33 +0800311 trace_ocfs2_validate_group_descriptor(
312 (unsigned long long)bh->b_blocknr);
Joel Becker970e4932008-11-13 14:49:19 -0800313
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
Mark Fashehccd979b2005-12-15 14:31:24 -0800392 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
Mark Fashehb06970532006-03-03 10:24:33 -0800393 ocfs2_error(alloc_inode->i_sb, "group block (%llu) != "
394 "b_blocknr (%llu)",
395 (unsigned long long)group_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -0800396 (unsigned long long) bg_bh->b_blocknr);
397 status = -EIO;
398 goto bail;
399 }
400
Joel Becker13723d02008-10-17 19:25:01 -0700401 status = ocfs2_journal_access_gd(handle,
Joel Becker0cf2f762009-02-12 16:41:25 -0800402 INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -0700403 bg_bh,
404 OCFS2_JOURNAL_ACCESS_CREATE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800405 if (status < 0) {
406 mlog_errno(status);
407 goto bail;
408 }
409
410 memset(bg, 0, sb->s_blocksize);
411 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
412 bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
Tao Ma85718822010-04-13 14:38:06 +0800413 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
414 osb->s_feature_incompat));
Mark Fashehccd979b2005-12-15 14:31:24 -0800415 bg->bg_chain = cpu_to_le16(my_chain);
416 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
417 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
418 bg->bg_blkno = cpu_to_le64(group_blkno);
Joel Becker798db352010-04-13 14:26:32 +0800419 if (group_clusters == le16_to_cpu(cl->cl_cpg))
420 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
421 else
Tao Ma47119542010-04-22 14:09:15 +0800422 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
Joel Becker798db352010-04-13 14:26:32 +0800423 group_clusters);
424
Mark Fashehccd979b2005-12-15 14:31:24 -0800425 /* set the 1st bit in the bitmap to account for the descriptor block */
426 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
427 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
428
Joel Beckerec20cec2010-03-19 14:13:52 -0700429 ocfs2_journal_dirty(handle, bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800430
431 /* There is no need to zero out or otherwise initialize the
432 * other blocks in a group - All valid FS metadata in a block
433 * group stores the superblock fs_generation value at
434 * allocation time. */
435
436bail:
Tao Mac1e8d352011-03-07 16:43:21 +0800437 if (status)
438 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -0800439 return status;
440}
441
442static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
443{
444 u16 curr, best;
445
446 best = curr = 0;
447 while (curr < le16_to_cpu(cl->cl_count)) {
448 if (le32_to_cpu(cl->cl_recs[best].c_total) >
449 le32_to_cpu(cl->cl_recs[curr].c_total))
450 best = curr;
451 curr++;
452 }
453 return best;
454}
455
Joel Becker798db352010-04-13 14:26:32 +0800456static struct buffer_head *
457ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
458 struct inode *alloc_inode,
459 struct ocfs2_alloc_context *ac,
460 struct ocfs2_chain_list *cl)
461{
462 int status;
463 u32 bit_off, num_bits;
464 u64 bg_blkno;
465 struct buffer_head *bg_bh;
466 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
467
Joel Becker1ed9b772010-05-06 13:59:06 +0800468 status = ocfs2_claim_clusters(handle, ac,
Joel Becker798db352010-04-13 14:26:32 +0800469 le16_to_cpu(cl->cl_cpg), &bit_off,
470 &num_bits);
471 if (status < 0) {
472 if (status != -ENOSPC)
473 mlog_errno(status);
474 goto bail;
475 }
476
477 /* setup the group */
478 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
Tao Ma2f73e132011-02-22 08:22:33 +0800479 trace_ocfs2_block_group_alloc_contig(
480 (unsigned long long)bg_blkno, alloc_rec);
Joel Becker798db352010-04-13 14:26:32 +0800481
482 bg_bh = sb_getblk(osb->sb, bg_blkno);
483 if (!bg_bh) {
484 status = -EIO;
485 mlog_errno(status);
486 goto bail;
487 }
488 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
489
490 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
491 bg_blkno, num_bits, alloc_rec, cl);
492 if (status < 0) {
493 brelse(bg_bh);
494 mlog_errno(status);
495 }
496
497bail:
498 return status ? ERR_PTR(status) : bg_bh;
499}
500
501static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
502 handle_t *handle,
503 struct ocfs2_alloc_context *ac,
504 unsigned int min_bits,
505 u32 *bit_off, u32 *num_bits)
506{
Joel Becker18d3a982010-05-18 16:47:55 -0700507 int status = 0;
Joel Becker798db352010-04-13 14:26:32 +0800508
509 while (min_bits) {
Joel Becker1ed9b772010-05-06 13:59:06 +0800510 status = ocfs2_claim_clusters(handle, ac, min_bits,
Joel Becker798db352010-04-13 14:26:32 +0800511 bit_off, num_bits);
512 if (status != -ENOSPC)
513 break;
514
515 min_bits >>= 1;
516 }
517
518 return status;
519}
520
521static int ocfs2_block_group_grow_discontig(handle_t *handle,
522 struct inode *alloc_inode,
523 struct buffer_head *bg_bh,
524 struct ocfs2_alloc_context *ac,
525 struct ocfs2_chain_list *cl,
526 unsigned int min_bits)
527{
528 int status;
529 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
530 struct ocfs2_group_desc *bg =
531 (struct ocfs2_group_desc *)bg_bh->b_data;
Tao Ma47119542010-04-22 14:09:15 +0800532 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
533 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
Joel Becker798db352010-04-13 14:26:32 +0800534 u32 p_cpos, clusters;
535 u64 p_blkno;
536 struct ocfs2_extent_list *el = &bg->bg_list;
537
538 status = ocfs2_journal_access_gd(handle,
539 INODE_CACHE(alloc_inode),
540 bg_bh,
541 OCFS2_JOURNAL_ACCESS_CREATE);
542 if (status < 0) {
543 mlog_errno(status);
544 goto bail;
545 }
546
547 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
548 le16_to_cpu(el->l_count))) {
Joel Becker798db352010-04-13 14:26:32 +0800549 if (min_bits > needed)
550 min_bits = needed;
551 status = ocfs2_block_group_claim_bits(osb, handle, ac,
552 min_bits, &p_cpos,
553 &clusters);
554 if (status < 0) {
555 if (status != -ENOSPC)
556 mlog_errno(status);
557 goto bail;
558 }
559 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
560 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
561 clusters);
562
563 min_bits = clusters;
Tao Ma47119542010-04-22 14:09:15 +0800564 needed = le16_to_cpu(cl->cl_cpg) -
565 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
Joel Becker798db352010-04-13 14:26:32 +0800566 }
567
568 if (needed > 0) {
Tao Ma47119542010-04-22 14:09:15 +0800569 /*
570 * We have used up all the extent rec but can't fill up
571 * the cpg. So bail out.
572 */
573 status = -ENOSPC;
574 goto bail;
Joel Becker798db352010-04-13 14:26:32 +0800575 }
576
577 ocfs2_journal_dirty(handle, bg_bh);
578
579bail:
580 return status;
581}
582
Joel Becker8b06bc52010-03-26 10:09:29 +0800583static void ocfs2_bg_alloc_cleanup(handle_t *handle,
584 struct ocfs2_alloc_context *cluster_ac,
585 struct inode *alloc_inode,
586 struct buffer_head *bg_bh)
Joel Becker798db352010-04-13 14:26:32 +0800587{
Joel Becker8b06bc52010-03-26 10:09:29 +0800588 int i, ret;
Joel Becker798db352010-04-13 14:26:32 +0800589 struct ocfs2_group_desc *bg;
590 struct ocfs2_extent_list *el;
591 struct ocfs2_extent_rec *rec;
592
593 if (!bg_bh)
594 return;
595
596 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
597 el = &bg->bg_list;
598 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
599 rec = &el->l_recs[i];
Joel Becker8b06bc52010-03-26 10:09:29 +0800600 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
601 cluster_ac->ac_bh,
602 le64_to_cpu(rec->e_blkno),
Al Viro72094e42012-04-13 12:30:02 -0400603 le16_to_cpu(rec->e_leaf_clusters));
Joel Becker8b06bc52010-03-26 10:09:29 +0800604 if (ret)
605 mlog_errno(ret);
606 /* Try all the clusters to free */
Joel Becker798db352010-04-13 14:26:32 +0800607 }
608
609 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
610 brelse(bg_bh);
611}
612
613static struct buffer_head *
614ocfs2_block_group_alloc_discontig(handle_t *handle,
615 struct inode *alloc_inode,
616 struct ocfs2_alloc_context *ac,
Joel Becker8b06bc52010-03-26 10:09:29 +0800617 struct ocfs2_chain_list *cl)
Joel Becker798db352010-04-13 14:26:32 +0800618{
619 int status;
620 u32 bit_off, num_bits;
621 u64 bg_blkno;
622 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
623 struct buffer_head *bg_bh = NULL;
624 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
625 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
626
Tao Ma47119542010-04-22 14:09:15 +0800627 if (!ocfs2_supports_discontig_bg(osb)) {
Joel Becker798db352010-04-13 14:26:32 +0800628 status = -ENOSPC;
629 goto bail;
630 }
631
Joel Becker8b06bc52010-03-26 10:09:29 +0800632 status = ocfs2_extend_trans(handle,
633 ocfs2_calc_bg_discontig_credits(osb->sb));
634 if (status) {
635 mlog_errno(status);
636 goto bail;
637 }
638
Joel Becker95ec0ad2010-03-26 10:10:08 +0800639 /*
640 * We're going to be grabbing from multiple cluster groups.
641 * We don't have enough credits to relink them all, and the
642 * cluster groups will be staying in cache for the duration of
643 * this operation.
644 */
Xiaowei.Hu309a85b2013-02-27 17:02:49 -0800645 ac->ac_disable_chain_relink = 1;
Joel Becker95ec0ad2010-03-26 10:10:08 +0800646
Joel Becker798db352010-04-13 14:26:32 +0800647 /* Claim the first region */
648 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
649 &bit_off, &num_bits);
650 if (status < 0) {
651 if (status != -ENOSPC)
652 mlog_errno(status);
653 goto bail;
654 }
655 min_bits = num_bits;
656
657 /* setup the group */
658 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
Tao Ma2f73e132011-02-22 08:22:33 +0800659 trace_ocfs2_block_group_alloc_discontig(
660 (unsigned long long)bg_blkno, alloc_rec);
Joel Becker798db352010-04-13 14:26:32 +0800661
662 bg_bh = sb_getblk(osb->sb, bg_blkno);
663 if (!bg_bh) {
664 status = -EIO;
665 mlog_errno(status);
666 goto bail;
667 }
668 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
669
670 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
671 bg_blkno, num_bits, alloc_rec, cl);
672 if (status < 0) {
673 mlog_errno(status);
674 goto bail;
675 }
676
677 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
678 bg_bh, ac, cl, min_bits);
679 if (status)
680 mlog_errno(status);
681
682bail:
683 if (status)
Joel Becker8b06bc52010-03-26 10:09:29 +0800684 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
Joel Becker798db352010-04-13 14:26:32 +0800685 return status ? ERR_PTR(status) : bg_bh;
686}
687
Mark Fashehccd979b2005-12-15 14:31:24 -0800688/*
689 * We expect the block group allocator to already be locked.
690 */
691static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
692 struct inode *alloc_inode,
Joel Becker1187c962008-09-03 20:03:39 -0700693 struct buffer_head *bh,
Tao Ma60ca81e2009-02-25 00:53:24 +0800694 u64 max_block,
Tao Mafeb473a2009-02-25 00:53:25 +0800695 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +0800696 int flags)
Mark Fashehccd979b2005-12-15 14:31:24 -0800697{
698 int status, credits;
699 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
700 struct ocfs2_chain_list *cl;
701 struct ocfs2_alloc_context *ac = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700702 handle_t *handle = NULL;
Tao Ma47119542010-04-22 14:09:15 +0800703 u16 alloc_rec;
Mark Fashehccd979b2005-12-15 14:31:24 -0800704 struct buffer_head *bg_bh = NULL;
705 struct ocfs2_group_desc *bg;
706
707 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
708
Mark Fashehccd979b2005-12-15 14:31:24 -0800709 cl = &fe->id2.i_chain;
Joel Becker1187c962008-09-03 20:03:39 -0700710 status = ocfs2_reserve_clusters_with_limit(osb,
711 le16_to_cpu(cl->cl_cpg),
Tao Ma60ca81e2009-02-25 00:53:24 +0800712 max_block, flags, &ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800713 if (status < 0) {
714 if (status != -ENOSPC)
715 mlog_errno(status);
716 goto bail;
717 }
718
719 credits = ocfs2_calc_group_alloc_credits(osb->sb,
720 le16_to_cpu(cl->cl_cpg));
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700721 handle = ocfs2_start_trans(osb, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800722 if (IS_ERR(handle)) {
723 status = PTR_ERR(handle);
724 handle = NULL;
725 mlog_errno(status);
726 goto bail;
727 }
728
Tao Mafeb473a2009-02-25 00:53:25 +0800729 if (last_alloc_group && *last_alloc_group != 0) {
Tao Ma2f73e132011-02-22 08:22:33 +0800730 trace_ocfs2_block_group_alloc(
731 (unsigned long long)*last_alloc_group);
Tao Mafeb473a2009-02-25 00:53:25 +0800732 ac->ac_last_group = *last_alloc_group;
733 }
Joel Becker798db352010-04-13 14:26:32 +0800734
735 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
736 ac, cl);
737 if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
738 bg_bh = ocfs2_block_group_alloc_discontig(handle,
739 alloc_inode,
Joel Becker8b06bc52010-03-26 10:09:29 +0800740 ac, cl);
Joel Becker798db352010-04-13 14:26:32 +0800741 if (IS_ERR(bg_bh)) {
742 status = PTR_ERR(bg_bh);
743 bg_bh = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800744 if (status != -ENOSPC)
745 mlog_errno(status);
746 goto bail;
747 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800748 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
749
Joel Becker0cf2f762009-02-12 16:41:25 -0800750 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -0700751 bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800752 if (status < 0) {
753 mlog_errno(status);
754 goto bail;
755 }
756
Tao Ma47119542010-04-22 14:09:15 +0800757 alloc_rec = le16_to_cpu(bg->bg_chain);
758 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
Mark Fashehccd979b2005-12-15 14:31:24 -0800759 le16_to_cpu(bg->bg_free_bits_count));
Tao Ma47119542010-04-22 14:09:15 +0800760 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
Joel Becker798db352010-04-13 14:26:32 +0800761 le16_to_cpu(bg->bg_bits));
Tao Ma0a463b72010-07-08 11:11:11 +0800762 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -0800763 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
764 le16_add_cpu(&cl->cl_next_free_rec, 1);
765
766 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
767 le16_to_cpu(bg->bg_free_bits_count));
768 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
769 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
770
Joel Beckerec20cec2010-03-19 14:13:52 -0700771 ocfs2_journal_dirty(handle, bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800772
773 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
774 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
775 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
776 le32_to_cpu(fe->i_clusters)));
777 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
778 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
Mark Fasheh8110b072007-03-22 16:53:23 -0700779 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800780
781 status = 0;
Tao Mafeb473a2009-02-25 00:53:25 +0800782
783 /* save the new last alloc group so that the caller can cache it. */
784 if (last_alloc_group)
785 *last_alloc_group = ac->ac_last_group;
786
Mark Fashehccd979b2005-12-15 14:31:24 -0800787bail:
788 if (handle)
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700789 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800790
791 if (ac)
792 ocfs2_free_alloc_context(ac);
793
Mark Fasheha81cb882008-10-07 14:25:16 -0700794 brelse(bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800795
Tao Mac1e8d352011-03-07 16:43:21 +0800796 if (status)
797 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -0800798 return status;
799}
800
801static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
Mark Fashehda5cbf22006-10-06 18:34:35 -0700802 struct ocfs2_alloc_context *ac,
803 int type,
Tao Maffda89a2008-03-03 17:12:09 +0800804 u32 slot,
Tao Mafeb473a2009-02-25 00:53:25 +0800805 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +0800806 int flags)
Mark Fashehccd979b2005-12-15 14:31:24 -0800807{
808 int status;
809 u32 bits_wanted = ac->ac_bits_wanted;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700810 struct inode *alloc_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800811 struct buffer_head *bh = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800812 struct ocfs2_dinode *fe;
813 u32 free_bits;
814
Mark Fashehda5cbf22006-10-06 18:34:35 -0700815 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
816 if (!alloc_inode) {
817 mlog_errno(-EINVAL);
818 return -EINVAL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800819 }
820
Mark Fashehda5cbf22006-10-06 18:34:35 -0700821 mutex_lock(&alloc_inode->i_mutex);
822
Mark Fashehe63aecb62007-10-18 15:30:42 -0700823 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
Mark Fashehda5cbf22006-10-06 18:34:35 -0700824 if (status < 0) {
825 mutex_unlock(&alloc_inode->i_mutex);
826 iput(alloc_inode);
827
828 mlog_errno(status);
829 return status;
830 }
831
832 ac->ac_inode = alloc_inode;
Tao Maa4a48912008-03-03 17:12:30 +0800833 ac->ac_alloc_slot = slot;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700834
Mark Fashehccd979b2005-12-15 14:31:24 -0800835 fe = (struct ocfs2_dinode *) bh->b_data;
Joel Becker10995aa2008-11-13 14:49:12 -0800836
837 /* The bh was validated by the inode read inside
838 * ocfs2_inode_lock(). Any corruption is a code bug. */
839 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
840
Mark Fashehccd979b2005-12-15 14:31:24 -0800841 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
Mark Fashehb06970532006-03-03 10:24:33 -0800842 ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator %llu",
843 (unsigned long long)le64_to_cpu(fe->i_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -0800844 status = -EIO;
845 goto bail;
846 }
847
848 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
849 le32_to_cpu(fe->id1.bitmap1.i_used);
850
851 if (bits_wanted > free_bits) {
852 /* cluster bitmap never grows */
853 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
Tao Ma2f73e132011-02-22 08:22:33 +0800854 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
855 free_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800856 status = -ENOSPC;
857 goto bail;
858 }
859
Tao Ma60ca81e2009-02-25 00:53:24 +0800860 if (!(flags & ALLOC_NEW_GROUP)) {
Tao Ma2f73e132011-02-22 08:22:33 +0800861 trace_ocfs2_reserve_suballoc_bits_no_new_group(
862 slot, bits_wanted, free_bits);
Tao Maffda89a2008-03-03 17:12:09 +0800863 status = -ENOSPC;
864 goto bail;
865 }
866
Joel Becker1187c962008-09-03 20:03:39 -0700867 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
Tao Mafeb473a2009-02-25 00:53:25 +0800868 ac->ac_max_block,
869 last_alloc_group, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800870 if (status < 0) {
871 if (status != -ENOSPC)
872 mlog_errno(status);
873 goto bail;
874 }
875 atomic_inc(&osb->alloc_stats.bg_extends);
876
877 /* You should never ask for this much metadata */
878 BUG_ON(bits_wanted >
879 (le32_to_cpu(fe->id1.bitmap1.i_total)
880 - le32_to_cpu(fe->id1.bitmap1.i_used)));
881 }
882
883 get_bh(bh);
884 ac->ac_bh = bh;
885bail:
Mark Fasheha81cb882008-10-07 14:25:16 -0700886 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800887
Tao Mac1e8d352011-03-07 16:43:21 +0800888 if (status)
889 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -0800890 return status;
891}
892
Tiger Yangb89c5422010-01-25 14:11:06 +0800893static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
894{
895 spin_lock(&osb->osb_lock);
896 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
897 spin_unlock(&osb->osb_lock);
898 atomic_set(&osb->s_num_inodes_stolen, 0);
899}
900
901static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
902{
903 spin_lock(&osb->osb_lock);
904 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
905 spin_unlock(&osb->osb_lock);
906 atomic_set(&osb->s_num_meta_stolen, 0);
907}
908
909void ocfs2_init_steal_slots(struct ocfs2_super *osb)
910{
911 ocfs2_init_inode_steal_slot(osb);
912 ocfs2_init_meta_steal_slot(osb);
913}
914
915static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
916{
917 spin_lock(&osb->osb_lock);
918 if (type == INODE_ALLOC_SYSTEM_INODE)
919 osb->s_inode_steal_slot = slot;
920 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
921 osb->s_meta_steal_slot = slot;
922 spin_unlock(&osb->osb_lock);
923}
924
925static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
926{
927 int slot = OCFS2_INVALID_SLOT;
928
929 spin_lock(&osb->osb_lock);
930 if (type == INODE_ALLOC_SYSTEM_INODE)
931 slot = osb->s_inode_steal_slot;
932 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
933 slot = osb->s_meta_steal_slot;
934 spin_unlock(&osb->osb_lock);
935
936 return slot;
937}
938
939static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
940{
941 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
942}
943
944static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
945{
946 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
947}
948
949static int ocfs2_steal_resource(struct ocfs2_super *osb,
950 struct ocfs2_alloc_context *ac,
951 int type)
952{
953 int i, status = -ENOSPC;
954 int slot = __ocfs2_get_steal_slot(osb, type);
955
956 /* Start to steal resource from the first slot after ours. */
957 if (slot == OCFS2_INVALID_SLOT)
958 slot = osb->slot_num + 1;
959
960 for (i = 0; i < osb->max_slots; i++, slot++) {
961 if (slot == osb->max_slots)
962 slot = 0;
963
964 if (slot == osb->slot_num)
965 continue;
966
967 status = ocfs2_reserve_suballoc_bits(osb, ac,
968 type,
969 (u32)slot, NULL,
970 NOT_ALLOC_NEW_GROUP);
971 if (status >= 0) {
972 __ocfs2_set_steal_slot(osb, slot, type);
973 break;
974 }
975
976 ocfs2_free_ac_resource(ac);
977 }
978
979 return status;
980}
981
982static int ocfs2_steal_inode(struct ocfs2_super *osb,
983 struct ocfs2_alloc_context *ac)
984{
985 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
986}
987
988static int ocfs2_steal_meta(struct ocfs2_super *osb,
989 struct ocfs2_alloc_context *ac)
990{
991 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
992}
993
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800994int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
995 int blocks,
996 struct ocfs2_alloc_context **ac)
Mark Fashehccd979b2005-12-15 14:31:24 -0800997{
998 int status;
Tiger Yangb89c5422010-01-25 14:11:06 +0800999 int slot = ocfs2_get_meta_steal_slot(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08001000
Robert P. J. Daycd861282006-12-13 00:34:52 -08001001 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001002 if (!(*ac)) {
1003 status = -ENOMEM;
1004 mlog_errno(status);
1005 goto bail;
1006 }
1007
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001008 (*ac)->ac_bits_wanted = blocks;
Mark Fashehccd979b2005-12-15 14:31:24 -08001009 (*ac)->ac_which = OCFS2_AC_USE_META;
Mark Fashehccd979b2005-12-15 14:31:24 -08001010 (*ac)->ac_group_search = ocfs2_block_group_search;
1011
Tiger Yangb89c5422010-01-25 14:11:06 +08001012 if (slot != OCFS2_INVALID_SLOT &&
1013 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
1014 goto extent_steal;
1015
1016 atomic_set(&osb->s_num_meta_stolen, 0);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001017 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
Tao Maffda89a2008-03-03 17:12:09 +08001018 EXTENT_ALLOC_SYSTEM_INODE,
Tiger Yangb89c5422010-01-25 14:11:06 +08001019 (u32)osb->slot_num, NULL,
Mark Fasheh33d5d382010-02-24 13:34:09 -08001020 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
Tiger Yangb89c5422010-01-25 14:11:06 +08001021
1022
1023 if (status >= 0) {
1024 status = 0;
1025 if (slot != OCFS2_INVALID_SLOT)
1026 ocfs2_init_meta_steal_slot(osb);
1027 goto bail;
1028 } else if (status < 0 && status != -ENOSPC) {
1029 mlog_errno(status);
1030 goto bail;
1031 }
1032
1033 ocfs2_free_ac_resource(*ac);
1034
1035extent_steal:
1036 status = ocfs2_steal_meta(osb, *ac);
1037 atomic_inc(&osb->s_num_meta_stolen);
Mark Fashehccd979b2005-12-15 14:31:24 -08001038 if (status < 0) {
1039 if (status != -ENOSPC)
1040 mlog_errno(status);
1041 goto bail;
1042 }
1043
1044 status = 0;
1045bail:
1046 if ((status < 0) && *ac) {
1047 ocfs2_free_alloc_context(*ac);
1048 *ac = NULL;
1049 }
1050
Tao Mac1e8d352011-03-07 16:43:21 +08001051 if (status)
1052 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001053 return status;
1054}
1055
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001056int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1057 struct ocfs2_extent_list *root_el,
1058 struct ocfs2_alloc_context **ac)
1059{
1060 return ocfs2_reserve_new_metadata_blocks(osb,
1061 ocfs2_extend_meta_needed(root_el),
1062 ac);
1063}
1064
Mark Fashehccd979b2005-12-15 14:31:24 -08001065int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
Mark Fashehccd979b2005-12-15 14:31:24 -08001066 struct ocfs2_alloc_context **ac)
1067{
1068 int status;
Tiger Yangb89c5422010-01-25 14:11:06 +08001069 int slot = ocfs2_get_inode_steal_slot(osb);
Tao Mafeb473a2009-02-25 00:53:25 +08001070 u64 alloc_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001071
Robert P. J. Daycd861282006-12-13 00:34:52 -08001072 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001073 if (!(*ac)) {
1074 status = -ENOMEM;
1075 mlog_errno(status);
1076 goto bail;
1077 }
1078
1079 (*ac)->ac_bits_wanted = 1;
Mark Fashehccd979b2005-12-15 14:31:24 -08001080 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1081
Mark Fashehccd979b2005-12-15 14:31:24 -08001082 (*ac)->ac_group_search = ocfs2_block_group_search;
1083
Tao Ma4d0ddb22008-03-05 16:11:46 +08001084 /*
Joel Becker1187c962008-09-03 20:03:39 -07001085 * stat(2) can't handle i_ino > 32bits, so we tell the
1086 * lower levels not to allocate us a block group past that
Joel Becker12462f12008-09-03 20:03:40 -07001087 * limit. The 'inode64' mount option avoids this behavior.
Joel Becker1187c962008-09-03 20:03:39 -07001088 */
Joel Becker12462f12008-09-03 20:03:40 -07001089 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1090 (*ac)->ac_max_block = (u32)~0U;
Joel Becker1187c962008-09-03 20:03:39 -07001091
1092 /*
Tao Ma4d0ddb22008-03-05 16:11:46 +08001093 * slot is set when we successfully steal inode from other nodes.
1094 * It is reset in 3 places:
1095 * 1. when we flush the truncate log
1096 * 2. when we complete local alloc recovery.
1097 * 3. when we successfully allocate from our own slot.
1098 * After it is set, we will go on stealing inodes until we find the
1099 * need to check our slots to see whether there is some space for us.
1100 */
1101 if (slot != OCFS2_INVALID_SLOT &&
Tiger Yangb89c5422010-01-25 14:11:06 +08001102 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
Tao Ma4d0ddb22008-03-05 16:11:46 +08001103 goto inode_steal;
1104
1105 atomic_set(&osb->s_num_inodes_stolen, 0);
Tao Mafeb473a2009-02-25 00:53:25 +08001106 alloc_group = osb->osb_inode_alloc_group;
Mark Fashehda5cbf22006-10-06 18:34:35 -07001107 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1108 INODE_ALLOC_SYSTEM_INODE,
Tiger Yangb89c5422010-01-25 14:11:06 +08001109 (u32)osb->slot_num,
Tao Mafeb473a2009-02-25 00:53:25 +08001110 &alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +08001111 ALLOC_NEW_GROUP |
1112 ALLOC_GROUPS_FROM_GLOBAL);
Tao Ma4d0ddb22008-03-05 16:11:46 +08001113 if (status >= 0) {
1114 status = 0;
1115
Tao Mafeb473a2009-02-25 00:53:25 +08001116 spin_lock(&osb->osb_lock);
1117 osb->osb_inode_alloc_group = alloc_group;
1118 spin_unlock(&osb->osb_lock);
Tao Ma2f73e132011-02-22 08:22:33 +08001119 trace_ocfs2_reserve_new_inode_new_group(
1120 (unsigned long long)alloc_group);
Tao Mafeb473a2009-02-25 00:53:25 +08001121
Tao Ma4d0ddb22008-03-05 16:11:46 +08001122 /*
1123 * Some inodes must be freed by us, so try to allocate
1124 * from our own next time.
1125 */
1126 if (slot != OCFS2_INVALID_SLOT)
1127 ocfs2_init_inode_steal_slot(osb);
1128 goto bail;
1129 } else if (status < 0 && status != -ENOSPC) {
1130 mlog_errno(status);
1131 goto bail;
1132 }
1133
1134 ocfs2_free_ac_resource(*ac);
1135
1136inode_steal:
Tiger Yangb89c5422010-01-25 14:11:06 +08001137 status = ocfs2_steal_inode(osb, *ac);
Tao Ma4d0ddb22008-03-05 16:11:46 +08001138 atomic_inc(&osb->s_num_inodes_stolen);
Mark Fashehccd979b2005-12-15 14:31:24 -08001139 if (status < 0) {
1140 if (status != -ENOSPC)
1141 mlog_errno(status);
1142 goto bail;
1143 }
1144
1145 status = 0;
1146bail:
1147 if ((status < 0) && *ac) {
1148 ocfs2_free_alloc_context(*ac);
1149 *ac = NULL;
1150 }
1151
Tao Mac1e8d352011-03-07 16:43:21 +08001152 if (status)
1153 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001154 return status;
1155}
1156
1157/* local alloc code has to do the same thing, so rather than do this
1158 * twice.. */
1159int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1160 struct ocfs2_alloc_context *ac)
1161{
1162 int status;
1163
Mark Fashehccd979b2005-12-15 14:31:24 -08001164 ac->ac_which = OCFS2_AC_USE_MAIN;
1165 ac->ac_group_search = ocfs2_cluster_group_search;
1166
Mark Fashehda5cbf22006-10-06 18:34:35 -07001167 status = ocfs2_reserve_suballoc_bits(osb, ac,
1168 GLOBAL_BITMAP_SYSTEM_INODE,
Tao Mafeb473a2009-02-25 00:53:25 +08001169 OCFS2_INVALID_SLOT, NULL,
Tao Maffda89a2008-03-03 17:12:09 +08001170 ALLOC_NEW_GROUP);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001171 if (status < 0 && status != -ENOSPC) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001172 mlog_errno(status);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001173 goto bail;
1174 }
1175
Mark Fashehccd979b2005-12-15 14:31:24 -08001176bail:
1177 return status;
1178}
1179
1180/* Callers don't need to care which bitmap (local alloc or main) to
1181 * use so we figure it out for them, but unfortunately this clutters
1182 * things a bit. */
Joel Becker1187c962008-09-03 20:03:39 -07001183static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1184 u32 bits_wanted, u64 max_block,
Tao Ma60ca81e2009-02-25 00:53:24 +08001185 int flags,
Joel Becker1187c962008-09-03 20:03:39 -07001186 struct ocfs2_alloc_context **ac)
Mark Fashehccd979b2005-12-15 14:31:24 -08001187{
1188 int status;
1189
Robert P. J. Daycd861282006-12-13 00:34:52 -08001190 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001191 if (!(*ac)) {
1192 status = -ENOMEM;
1193 mlog_errno(status);
1194 goto bail;
1195 }
1196
1197 (*ac)->ac_bits_wanted = bits_wanted;
Joel Becker1187c962008-09-03 20:03:39 -07001198 (*ac)->ac_max_block = max_block;
Mark Fashehccd979b2005-12-15 14:31:24 -08001199
1200 status = -ENOSPC;
Tao Ma60ca81e2009-02-25 00:53:24 +08001201 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1202 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001203 status = ocfs2_reserve_local_alloc_bits(osb,
Mark Fashehccd979b2005-12-15 14:31:24 -08001204 bits_wanted,
1205 *ac);
Mark Fasheha57c8fd2010-03-16 21:01:00 -07001206 if ((status < 0) && (status != -ENOSPC)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001207 mlog_errno(status);
1208 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -08001209 }
1210 }
1211
1212 if (status == -ENOSPC) {
1213 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1214 if (status < 0) {
1215 if (status != -ENOSPC)
1216 mlog_errno(status);
1217 goto bail;
1218 }
1219 }
1220
1221 status = 0;
1222bail:
1223 if ((status < 0) && *ac) {
1224 ocfs2_free_alloc_context(*ac);
1225 *ac = NULL;
1226 }
1227
Tao Mac1e8d352011-03-07 16:43:21 +08001228 if (status)
1229 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001230 return status;
1231}
1232
Joel Becker1187c962008-09-03 20:03:39 -07001233int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1234 u32 bits_wanted,
1235 struct ocfs2_alloc_context **ac)
1236{
Tao Ma60ca81e2009-02-25 00:53:24 +08001237 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1238 ALLOC_NEW_GROUP, ac);
Joel Becker1187c962008-09-03 20:03:39 -07001239}
1240
Mark Fashehccd979b2005-12-15 14:31:24 -08001241/*
1242 * More or less lifted from ext3. I'll leave their description below:
1243 *
1244 * "For ext3 allocations, we must not reuse any blocks which are
1245 * allocated in the bitmap buffer's "last committed data" copy. This
1246 * prevents deletes from freeing up the page for reuse until we have
1247 * committed the delete transaction.
1248 *
1249 * If we didn't do this, then deleting something and reallocating it as
1250 * data would allow the old block to be overwritten before the
1251 * transaction committed (because we force data to disk before commit).
1252 * This would lead to corruption if we crashed between overwriting the
1253 * data and committing the delete.
1254 *
1255 * @@@ We may want to make this allocation behaviour conditional on
1256 * data-writes at some point, and disable it for metadata allocations or
1257 * sync-data inodes."
1258 *
1259 * Note: OCFS2 already does this differently for metadata vs data
Joe Perchesc78bad12008-02-03 17:33:42 +02001260 * allocations, as those bitmaps are separate and undo access is never
Mark Fashehccd979b2005-12-15 14:31:24 -08001261 * called on a metadata group descriptor.
1262 */
1263static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1264 int nr)
1265{
1266 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001267 int ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08001268
1269 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1270 return 0;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001271
1272 if (!buffer_jbd(bg_bh))
Mark Fashehccd979b2005-12-15 14:31:24 -08001273 return 1;
1274
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001275 jbd_lock_bh_state(bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001276 bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001277 if (bg)
1278 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1279 else
1280 ret = 1;
1281 jbd_unlock_bh_state(bg_bh);
1282
1283 return ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08001284}
1285
1286static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1287 struct buffer_head *bg_bh,
1288 unsigned int bits_wanted,
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001289 unsigned int total_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001290 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001291{
1292 void *bitmap;
1293 u16 best_offset, best_size;
1294 int offset, start, found, status = 0;
1295 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1296
Joel Becker42035302008-11-13 14:49:15 -08001297 /* Callers got this descriptor from
1298 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1299 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001300
1301 found = start = best_offset = best_size = 0;
1302 bitmap = bg->bg_bitmap;
1303
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001304 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1305 if (offset == total_bits)
Mark Fashehccd979b2005-12-15 14:31:24 -08001306 break;
1307
1308 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1309 /* We found a zero, but we can't use it as it
1310 * hasn't been put to disk yet! */
1311 found = 0;
1312 start = offset + 1;
1313 } else if (offset == start) {
1314 /* we found a zero */
1315 found++;
1316 /* move start to the next bit to test */
1317 start++;
1318 } else {
1319 /* got a zero after some ones */
1320 found = 1;
1321 start = offset + 1;
1322 }
1323 if (found > best_size) {
1324 best_size = found;
1325 best_offset = start - found;
1326 }
1327 /* we got everything we needed */
1328 if (found == bits_wanted) {
1329 /* mlog(0, "Found it all!\n"); */
1330 break;
1331 }
1332 }
1333
Joel Becker7d1fe092010-04-13 14:30:19 +08001334 if (best_size) {
1335 res->sr_bit_offset = best_offset;
1336 res->sr_bits = best_size;
Mark Fashehccd979b2005-12-15 14:31:24 -08001337 } else {
1338 status = -ENOSPC;
1339 /* No error log here -- see the comment above
1340 * ocfs2_test_bg_bit_allocatable */
1341 }
1342
1343 return status;
1344}
1345
Mark Fasheh1fabe142006-10-09 18:11:45 -07001346static inline int ocfs2_block_group_set_bits(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001347 struct inode *alloc_inode,
1348 struct ocfs2_group_desc *bg,
1349 struct buffer_head *group_bh,
1350 unsigned int bit_off,
1351 unsigned int num_bits)
1352{
1353 int status;
1354 void *bitmap = bg->bg_bitmap;
1355 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1356
Joel Becker42035302008-11-13 14:49:15 -08001357 /* All callers get the descriptor via
1358 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1359 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001360 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1361
Tao Ma2f73e132011-02-22 08:22:33 +08001362 trace_ocfs2_block_group_set_bits(bit_off, num_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001363
1364 if (ocfs2_is_cluster_bitmap(alloc_inode))
1365 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1366
Joel Becker13723d02008-10-17 19:25:01 -07001367 status = ocfs2_journal_access_gd(handle,
Joel Becker0cf2f762009-02-12 16:41:25 -08001368 INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -07001369 group_bh,
1370 journal_type);
Mark Fashehccd979b2005-12-15 14:31:24 -08001371 if (status < 0) {
1372 mlog_errno(status);
1373 goto bail;
1374 }
1375
1376 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
Srinivas Eeda9b5cd102010-10-05 15:53:06 -07001377 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1378 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
1379 " count %u but claims %u are freed. num_bits %d",
1380 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1381 le16_to_cpu(bg->bg_bits),
1382 le16_to_cpu(bg->bg_free_bits_count), num_bits);
1383 return -EROFS;
1384 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001385 while(num_bits--)
1386 ocfs2_set_bit(bit_off++, bitmap);
1387
Joel Beckerec20cec2010-03-19 14:13:52 -07001388 ocfs2_journal_dirty(handle, group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001389
1390bail:
Tao Mac1e8d352011-03-07 16:43:21 +08001391 if (status)
1392 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001393 return status;
1394}
1395
1396/* find the one with the most empty bits */
1397static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1398{
1399 u16 curr, best;
1400
1401 BUG_ON(!cl->cl_next_free_rec);
1402
1403 best = curr = 0;
1404 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1405 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1406 le32_to_cpu(cl->cl_recs[best].c_free))
1407 best = curr;
1408 curr++;
1409 }
1410
1411 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1412 return best;
1413}
1414
Mark Fasheh1fabe142006-10-09 18:11:45 -07001415static int ocfs2_relink_block_group(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001416 struct inode *alloc_inode,
1417 struct buffer_head *fe_bh,
1418 struct buffer_head *bg_bh,
1419 struct buffer_head *prev_bg_bh,
1420 u16 chain)
1421{
1422 int status;
1423 /* there is a really tiny chance the journal calls could fail,
1424 * but we wouldn't want inconsistent blocks in *any* case. */
Jie Liu49309842013-07-03 15:00:59 -07001425 u64 bg_ptr, prev_bg_ptr;
Mark Fashehccd979b2005-12-15 14:31:24 -08001426 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1427 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1428 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1429
Joel Becker42035302008-11-13 14:49:15 -08001430 /* The caller got these descriptors from
1431 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1432 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1433 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001434
Tao Ma2f73e132011-02-22 08:22:33 +08001435 trace_ocfs2_relink_block_group(
1436 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1437 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1438 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -08001439
Mark Fashehccd979b2005-12-15 14:31:24 -08001440 bg_ptr = le64_to_cpu(bg->bg_next_group);
1441 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1442
Joel Becker0cf2f762009-02-12 16:41:25 -08001443 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1444 prev_bg_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001445 OCFS2_JOURNAL_ACCESS_WRITE);
Andrew Morton25e28922013-07-03 15:01:00 -07001446 if (status < 0)
Jie Liu49309842013-07-03 15:00:59 -07001447 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -08001448
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);
Andrew Morton25e28922013-07-03 15:01:00 -07001454 if (status < 0)
Jie Liu49309842013-07-03 15:00:59 -07001455 goto out_rollback_prev_bg;
Mark Fashehccd979b2005-12-15 14:31:24 -08001456
1457 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
Joel Beckerec20cec2010-03-19 14:13:52 -07001458 ocfs2_journal_dirty(handle, bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001459
Joel Becker0cf2f762009-02-12 16:41:25 -08001460 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1461 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
Andrew Morton25e28922013-07-03 15:01:00 -07001462 if (status < 0)
Jie Liu49309842013-07-03 15:00:59 -07001463 goto out_rollback_bg;
Mark Fashehccd979b2005-12-15 14:31:24 -08001464
1465 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
Joel Beckerec20cec2010-03-19 14:13:52 -07001466 ocfs2_journal_dirty(handle, fe_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001467
Jie Liu49309842013-07-03 15:00:59 -07001468out:
Andrew Morton25e28922013-07-03 15:01:00 -07001469 if (status < 0)
1470 mlog_errno(status);
Jie Liu49309842013-07-03 15:00:59 -07001471 return status;
Joel Becker42035302008-11-13 14:49:15 -08001472
Jie Liu49309842013-07-03 15:00:59 -07001473out_rollback_bg:
1474 bg->bg_next_group = cpu_to_le64(bg_ptr);
1475out_rollback_prev_bg:
1476 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
Andrew Morton25e28922013-07-03 15:01:00 -07001477 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -08001478}
1479
1480static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1481 u32 wanted)
1482{
1483 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1484}
1485
1486/* return 0 on success, -ENOSPC to keep searching and any other < 0
1487 * value on error. */
1488static int ocfs2_cluster_group_search(struct inode *inode,
1489 struct buffer_head *group_bh,
1490 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -07001491 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +08001492 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001493{
1494 int search = -ENOSPC;
1495 int ret;
Joel Becker1187c962008-09-03 20:03:39 -07001496 u64 blkoff;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001497 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fasheh9c7af402008-07-28 18:02:53 -07001498 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001499 unsigned int max_bits, gd_cluster_off;
Mark Fashehccd979b2005-12-15 14:31:24 -08001500
1501 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1502
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001503 if (gd->bg_free_bits_count) {
1504 max_bits = le16_to_cpu(gd->bg_bits);
1505
1506 /* Tail groups in cluster bitmaps which aren't cpg
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001507 * aligned are prone to partial extension by a failed
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001508 * fs resize. If the file system resize never got to
1509 * update the dinode cluster count, then we don't want
1510 * to trust any clusters past it, regardless of what
1511 * the group descriptor says. */
1512 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1513 le64_to_cpu(gd->bg_blkno));
1514 if ((gd_cluster_off + max_bits) >
1515 OCFS2_I(inode)->ip_clusters) {
1516 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
Tao Ma2f73e132011-02-22 08:22:33 +08001517 trace_ocfs2_cluster_group_search_wrong_max_bits(
1518 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1519 le16_to_cpu(gd->bg_bits),
1520 OCFS2_I(inode)->ip_clusters, max_bits);
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001521 }
1522
Mark Fashehccd979b2005-12-15 14:31:24 -08001523 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1524 group_bh, bits_wanted,
Joel Becker7d1fe092010-04-13 14:30:19 +08001525 max_bits, res);
Mark Fashehccd979b2005-12-15 14:31:24 -08001526 if (ret)
1527 return ret;
1528
Joel Becker1187c962008-09-03 20:03:39 -07001529 if (max_block) {
1530 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1531 gd_cluster_off +
Joel Becker7d1fe092010-04-13 14:30:19 +08001532 res->sr_bit_offset +
1533 res->sr_bits);
Tao Ma2f73e132011-02-22 08:22:33 +08001534 trace_ocfs2_cluster_group_search_max_block(
1535 (unsigned long long)blkoff,
1536 (unsigned long long)max_block);
Joel Becker1187c962008-09-03 20:03:39 -07001537 if (blkoff > max_block)
1538 return -ENOSPC;
1539 }
1540
Mark Fashehccd979b2005-12-15 14:31:24 -08001541 /* ocfs2_block_group_find_clear_bits() might
1542 * return success, but we still want to return
1543 * -ENOSPC unless it found the minimum number
1544 * of bits. */
Joel Becker7d1fe092010-04-13 14:30:19 +08001545 if (min_bits <= res->sr_bits)
Mark Fashehccd979b2005-12-15 14:31:24 -08001546 search = 0; /* success */
Joel Becker7d1fe092010-04-13 14:30:19 +08001547 else if (res->sr_bits) {
Mark Fasheh9c7af402008-07-28 18:02:53 -07001548 /*
1549 * Don't show bits which we'll be returning
1550 * for allocation to the local alloc bitmap.
1551 */
Joel Becker7d1fe092010-04-13 14:30:19 +08001552 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001553 }
1554 }
1555
1556 return search;
1557}
1558
1559static int ocfs2_block_group_search(struct inode *inode,
1560 struct buffer_head *group_bh,
1561 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -07001562 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +08001563 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001564{
1565 int ret = -ENOSPC;
Joel Becker1187c962008-09-03 20:03:39 -07001566 u64 blkoff;
Mark Fashehccd979b2005-12-15 14:31:24 -08001567 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1568
1569 BUG_ON(min_bits != 1);
1570 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1571
Joel Becker1187c962008-09-03 20:03:39 -07001572 if (bg->bg_free_bits_count) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001573 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1574 group_bh, bits_wanted,
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001575 le16_to_cpu(bg->bg_bits),
Joel Becker7d1fe092010-04-13 14:30:19 +08001576 res);
Joel Becker1187c962008-09-03 20:03:39 -07001577 if (!ret && max_block) {
Joel Becker7d1fe092010-04-13 14:30:19 +08001578 blkoff = le64_to_cpu(bg->bg_blkno) +
1579 res->sr_bit_offset + res->sr_bits;
Tao Ma2f73e132011-02-22 08:22:33 +08001580 trace_ocfs2_block_group_search_max_block(
1581 (unsigned long long)blkoff,
1582 (unsigned long long)max_block);
Joel Becker1187c962008-09-03 20:03:39 -07001583 if (blkoff > max_block)
1584 ret = -ENOSPC;
1585 }
1586 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001587
1588 return ret;
1589}
1590
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001591static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001592 handle_t *handle,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001593 struct buffer_head *di_bh,
1594 u32 num_bits,
1595 u16 chain)
1596{
1597 int ret;
1598 u32 tmp_used;
1599 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1600 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1601
Joel Becker0cf2f762009-02-12 16:41:25 -08001602 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001603 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001604 if (ret < 0) {
1605 mlog_errno(ret);
1606 goto out;
1607 }
1608
1609 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1610 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1611 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
Joel Beckerec20cec2010-03-19 14:13:52 -07001612 ocfs2_journal_dirty(handle, di_bh);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001613
1614out:
1615 return ret;
1616}
1617
Joel Beckerba206632010-03-26 10:08:59 +08001618static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1619 struct ocfs2_extent_rec *rec,
1620 struct ocfs2_chain_list *cl)
Joel Becker13e434c2010-03-26 10:08:27 +08001621{
1622 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1623 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
Al Viro72094e42012-04-13 12:30:02 -04001624 unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc;
Joel Becker13e434c2010-03-26 10:08:27 +08001625
1626 if (res->sr_bit_offset < bitoff)
1627 return 0;
1628 if (res->sr_bit_offset >= (bitoff + bitcount))
1629 return 0;
Joel Beckerba206632010-03-26 10:08:59 +08001630 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1631 (res->sr_bit_offset - bitoff);
Joel Becker13e434c2010-03-26 10:08:27 +08001632 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1633 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1634 return 1;
1635}
1636
Joel Beckerba206632010-03-26 10:08:59 +08001637static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1638 struct ocfs2_group_desc *bg,
1639 struct ocfs2_suballoc_result *res)
Joel Becker13e434c2010-03-26 10:08:27 +08001640{
1641 int i;
Joel Becker2b6cb572010-03-26 10:09:15 +08001642 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
Joel Becker13e434c2010-03-26 10:08:27 +08001643 struct ocfs2_extent_rec *rec;
1644 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1645 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1646
Joel Beckerba206632010-03-26 10:08:59 +08001647 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1648 res->sr_blkno = 0;
Joel Becker13e434c2010-03-26 10:08:27 +08001649 return;
Joel Beckerba206632010-03-26 10:08:59 +08001650 }
Joel Becker13e434c2010-03-26 10:08:27 +08001651
Joel Beckerba206632010-03-26 10:08:59 +08001652 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
Joel Becker2b6cb572010-03-26 10:09:15 +08001653 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
Tao Ma47119542010-04-22 14:09:15 +08001654 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
Joel Beckerba206632010-03-26 10:08:59 +08001655 !bg->bg_list.l_next_free_rec)
Joel Becker13e434c2010-03-26 10:08:27 +08001656 return;
1657
1658 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1659 rec = &bg->bg_list.l_recs[i];
Joel Becker2b6cb572010-03-26 10:09:15 +08001660 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1661 res->sr_bg_blkno = bg_blkno; /* Restore */
Joel Becker13e434c2010-03-26 10:08:27 +08001662 break;
Joel Becker2b6cb572010-03-26 10:09:15 +08001663 }
Joel Becker13e434c2010-03-26 10:08:27 +08001664 }
1665}
1666
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001667static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001668 handle_t *handle,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001669 u32 bits_wanted,
1670 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001671 struct ocfs2_suballoc_result *res,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001672 u16 *bits_left)
1673{
1674 int ret;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001675 struct buffer_head *group_bh = NULL;
1676 struct ocfs2_group_desc *gd;
Joel Becker68f64d42008-11-13 14:49:14 -08001677 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001678 struct inode *alloc_inode = ac->ac_inode;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001679
Joel Becker7d1fe092010-04-13 14:30:19 +08001680 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1681 res->sr_bg_blkno, &group_bh);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001682 if (ret < 0) {
1683 mlog_errno(ret);
1684 return ret;
1685 }
1686
1687 gd = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001688 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001689 ac->ac_max_block, res);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001690 if (ret < 0) {
1691 if (ret != -ENOSPC)
1692 mlog_errno(ret);
1693 goto out;
1694 }
1695
Joel Becker13e434c2010-03-26 10:08:27 +08001696 if (!ret)
Joel Beckerba206632010-03-26 10:08:59 +08001697 ocfs2_bg_discontig_fix_result(ac, gd, res);
Joel Becker13e434c2010-03-26 10:08:27 +08001698
Mark Fashehe49e2762010-08-13 15:15:17 -07001699 /*
1700 * sr_bg_blkno might have been changed by
1701 * ocfs2_bg_discontig_fix_result
1702 */
1703 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1704
1705 if (ac->ac_find_loc_only)
1706 goto out_loc_only;
1707
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001708 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001709 res->sr_bits,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001710 le16_to_cpu(gd->bg_chain));
1711 if (ret < 0) {
1712 mlog_errno(ret);
1713 goto out;
1714 }
1715
1716 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001717 res->sr_bit_offset, res->sr_bits);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001718 if (ret < 0)
1719 mlog_errno(ret);
1720
Mark Fashehe49e2762010-08-13 15:15:17 -07001721out_loc_only:
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001722 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1723
1724out:
1725 brelse(group_bh);
1726
1727 return ret;
1728}
1729
Mark Fashehccd979b2005-12-15 14:31:24 -08001730static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001731 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001732 u32 bits_wanted,
1733 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001734 struct ocfs2_suballoc_result *res,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001735 u16 *bits_left)
Mark Fashehccd979b2005-12-15 14:31:24 -08001736{
1737 int status;
Joel Becker7d1fe092010-04-13 14:30:19 +08001738 u16 chain;
Mark Fashehccd979b2005-12-15 14:31:24 -08001739 u64 next_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001740 struct inode *alloc_inode = ac->ac_inode;
1741 struct buffer_head *group_bh = NULL;
1742 struct buffer_head *prev_group_bh = NULL;
1743 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1744 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1745 struct ocfs2_group_desc *bg;
1746
1747 chain = ac->ac_chain;
Tao Ma2f73e132011-02-22 08:22:33 +08001748 trace_ocfs2_search_chain_begin(
1749 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
1750 bits_wanted, chain);
Mark Fashehccd979b2005-12-15 14:31:24 -08001751
Joel Becker68f64d42008-11-13 14:49:14 -08001752 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1753 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1754 &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001755 if (status < 0) {
1756 mlog_errno(status);
1757 goto bail;
1758 }
1759 bg = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -08001760
1761 status = -ENOSPC;
1762 /* for now, the chain search is a bit simplistic. We just use
1763 * the 1st group with any empty bits. */
Joel Becker1187c962008-09-03 20:03:39 -07001764 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1765 bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001766 ac->ac_max_block,
1767 res)) == -ENOSPC) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001768 if (!bg->bg_next_group)
1769 break;
Mark Fasheha81cb882008-10-07 14:25:16 -07001770
1771 brelse(prev_group_bh);
1772 prev_group_bh = NULL;
1773
Mark Fashehccd979b2005-12-15 14:31:24 -08001774 next_group = le64_to_cpu(bg->bg_next_group);
1775 prev_group_bh = group_bh;
1776 group_bh = NULL;
Joel Becker68f64d42008-11-13 14:49:14 -08001777 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1778 next_group, &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001779 if (status < 0) {
1780 mlog_errno(status);
1781 goto bail;
1782 }
1783 bg = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -08001784 }
1785 if (status < 0) {
1786 if (status != -ENOSPC)
1787 mlog_errno(status);
1788 goto bail;
1789 }
1790
Tao Ma2f73e132011-02-22 08:22:33 +08001791 trace_ocfs2_search_chain_succ(
1792 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001793
Joel Becker7d1fe092010-04-13 14:30:19 +08001794 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08001795
Joel Becker7d1fe092010-04-13 14:30:19 +08001796 BUG_ON(res->sr_bits == 0);
Joel Becker13e434c2010-03-26 10:08:27 +08001797 if (!status)
Joel Beckerba206632010-03-26 10:08:59 +08001798 ocfs2_bg_discontig_fix_result(ac, bg, res);
Joel Becker13e434c2010-03-26 10:08:27 +08001799
Mark Fashehe49e2762010-08-13 15:15:17 -07001800 /*
1801 * sr_bg_blkno might have been changed by
1802 * ocfs2_bg_discontig_fix_result
1803 */
1804 res->sr_bg_stable_blkno = group_bh->b_blocknr;
Mark Fashehccd979b2005-12-15 14:31:24 -08001805
1806 /*
1807 * Keep track of previous block descriptor read. When
1808 * we find a target, if we have read more than X
1809 * number of descriptors, and the target is reasonably
1810 * empty, relink him to top of his chain.
1811 *
1812 * We've read 0 extra blocks and only send one more to
1813 * the transaction, yet the next guy to search has a
1814 * much easier time.
1815 *
1816 * Do this *after* figuring out how many bits we're taking out
1817 * of our target group.
1818 */
Xiaowei.Hu309a85b2013-02-27 17:02:49 -08001819 if (!ac->ac_disable_chain_relink &&
Mark Fashehccd979b2005-12-15 14:31:24 -08001820 (prev_group_bh) &&
Joel Becker7d1fe092010-04-13 14:30:19 +08001821 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001822 status = ocfs2_relink_block_group(handle, alloc_inode,
1823 ac->ac_bh, group_bh,
1824 prev_group_bh, chain);
1825 if (status < 0) {
1826 mlog_errno(status);
1827 goto bail;
1828 }
1829 }
1830
Mark Fashehe49e2762010-08-13 15:15:17 -07001831 if (ac->ac_find_loc_only)
1832 goto out_loc_only;
1833
Mark Fashehd5134982010-08-13 15:15:16 -07001834 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1835 ac->ac_bh, res->sr_bits,
1836 chain);
1837 if (status) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001838 mlog_errno(status);
1839 goto bail;
1840 }
1841
Mark Fashehccd979b2005-12-15 14:31:24 -08001842 status = ocfs2_block_group_set_bits(handle,
1843 alloc_inode,
1844 bg,
1845 group_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001846 res->sr_bit_offset,
1847 res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001848 if (status < 0) {
1849 mlog_errno(status);
1850 goto bail;
1851 }
1852
Tao Ma2f73e132011-02-22 08:22:33 +08001853 trace_ocfs2_search_chain_end(
1854 (unsigned long long)le64_to_cpu(fe->i_blkno),
1855 res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001856
Mark Fashehe49e2762010-08-13 15:15:17 -07001857out_loc_only:
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001858 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
Mark Fashehccd979b2005-12-15 14:31:24 -08001859bail:
Mark Fasheha81cb882008-10-07 14:25:16 -07001860 brelse(group_bh);
1861 brelse(prev_group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001862
Tao Mac1e8d352011-03-07 16:43:21 +08001863 if (status)
1864 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001865 return status;
1866}
1867
1868/* will give out up to bits_wanted contiguous bits. */
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001869static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001870 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001871 u32 bits_wanted,
1872 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001873 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001874{
1875 int status;
1876 u16 victim, i;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001877 u16 bits_left = 0;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001878 u64 hint = ac->ac_last_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001879 struct ocfs2_chain_list *cl;
1880 struct ocfs2_dinode *fe;
1881
Mark Fashehccd979b2005-12-15 14:31:24 -08001882 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1883 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1884 BUG_ON(!ac->ac_bh);
1885
1886 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
Joel Becker10995aa2008-11-13 14:49:12 -08001887
1888 /* The bh was validated by the inode read during
1889 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1890 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1891
Mark Fashehccd979b2005-12-15 14:31:24 -08001892 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1893 le32_to_cpu(fe->id1.bitmap1.i_total)) {
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001894 ocfs2_error(ac->ac_inode->i_sb,
1895 "Chain allocator dinode %llu has %u used "
Mark Fashehb06970532006-03-03 10:24:33 -08001896 "bits but only %u total.",
1897 (unsigned long long)le64_to_cpu(fe->i_blkno),
Mark Fashehccd979b2005-12-15 14:31:24 -08001898 le32_to_cpu(fe->id1.bitmap1.i_used),
1899 le32_to_cpu(fe->id1.bitmap1.i_total));
1900 status = -EIO;
1901 goto bail;
1902 }
1903
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001904 res->sr_bg_blkno = hint;
Joel Becker7d1fe092010-04-13 14:30:19 +08001905 if (res->sr_bg_blkno) {
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001906 /* Attempt to short-circuit the usual search mechanism
1907 * by jumping straight to the most recently used
Uwe Kleine-Königb5950762010-11-01 15:38:34 -04001908 * allocation group. This helps us maintain some
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001909 * contiguousness across allocations. */
Mark Fashehda5cbf22006-10-06 18:34:35 -07001910 status = ocfs2_search_one_group(ac, handle, bits_wanted,
Joel Becker7d1fe092010-04-13 14:30:19 +08001911 min_bits, res, &bits_left);
1912 if (!status)
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001913 goto set_hint;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001914 if (status < 0 && status != -ENOSPC) {
1915 mlog_errno(status);
1916 goto bail;
1917 }
1918 }
1919
Mark Fashehccd979b2005-12-15 14:31:24 -08001920 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1921
1922 victim = ocfs2_find_victim_chain(cl);
1923 ac->ac_chain = victim;
Mark Fashehccd979b2005-12-15 14:31:24 -08001924
Joel Becker7d1fe092010-04-13 14:30:19 +08001925 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1926 res, &bits_left);
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001927 if (!status) {
1928 hint = ocfs2_group_from_res(res);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001929 goto set_hint;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001930 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001931 if (status < 0 && status != -ENOSPC) {
1932 mlog_errno(status);
1933 goto bail;
1934 }
1935
Tao Ma2f73e132011-02-22 08:22:33 +08001936 trace_ocfs2_claim_suballoc_bits(victim);
Mark Fashehccd979b2005-12-15 14:31:24 -08001937
1938 /* If we didn't pick a good victim, then just default to
1939 * searching each chain in order. Don't allow chain relinking
1940 * because we only calculate enough journal credits for one
1941 * relink per alloc. */
Xiaowei.Hu309a85b2013-02-27 17:02:49 -08001942 ac->ac_disable_chain_relink = 1;
Mark Fashehccd979b2005-12-15 14:31:24 -08001943 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1944 if (i == victim)
1945 continue;
1946 if (!cl->cl_recs[i].c_free)
1947 continue;
1948
1949 ac->ac_chain = i;
Mark Fashehda5cbf22006-10-06 18:34:35 -07001950 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001951 res, &bits_left);
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001952 if (!status) {
1953 hint = ocfs2_group_from_res(res);
Mark Fashehccd979b2005-12-15 14:31:24 -08001954 break;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001955 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001956 if (status < 0 && status != -ENOSPC) {
1957 mlog_errno(status);
1958 goto bail;
1959 }
1960 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001961
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001962set_hint:
1963 if (status != -ENOSPC) {
1964 /* If the next search of this group is not likely to
1965 * yield a suitable extent, then we reset the last
1966 * group hint so as to not waste a disk read */
1967 if (bits_left < min_bits)
1968 ac->ac_last_group = 0;
1969 else
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001970 ac->ac_last_group = hint;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001971 }
1972
1973bail:
Tao Mac1e8d352011-03-07 16:43:21 +08001974 if (status)
1975 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001976 return status;
1977}
1978
Joel Becker1ed9b772010-05-06 13:59:06 +08001979int ocfs2_claim_metadata(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001980 struct ocfs2_alloc_context *ac,
1981 u32 bits_wanted,
Joel Becker2b6cb572010-03-26 10:09:15 +08001982 u64 *suballoc_loc,
Mark Fashehccd979b2005-12-15 14:31:24 -08001983 u16 *suballoc_bit_start,
1984 unsigned int *num_bits,
1985 u64 *blkno_start)
1986{
1987 int status;
Joel Beckerba206632010-03-26 10:08:59 +08001988 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
Mark Fashehccd979b2005-12-15 14:31:24 -08001989
1990 BUG_ON(!ac);
1991 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
1992 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
Mark Fashehccd979b2005-12-15 14:31:24 -08001993
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001994 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07001995 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001996 bits_wanted,
1997 1,
Joel Becker7d1fe092010-04-13 14:30:19 +08001998 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08001999 if (status < 0) {
2000 mlog_errno(status);
2001 goto bail;
2002 }
Joel Becker1ed9b772010-05-06 13:59:06 +08002003 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
Mark Fashehccd979b2005-12-15 14:31:24 -08002004
Joel Becker2b6cb572010-03-26 10:09:15 +08002005 *suballoc_loc = res.sr_bg_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002006 *suballoc_bit_start = res.sr_bit_offset;
Joel Beckerba206632010-03-26 10:08:59 +08002007 *blkno_start = res.sr_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002008 ac->ac_bits_given += res.sr_bits;
2009 *num_bits = res.sr_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -08002010 status = 0;
2011bail:
Tao Mac1e8d352011-03-07 16:43:21 +08002012 if (status)
2013 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08002014 return status;
2015}
2016
Tao Ma13821152009-02-25 00:53:23 +08002017static void ocfs2_init_inode_ac_group(struct inode *dir,
Tao Maabf1b3c2010-04-27 08:30:36 +08002018 struct buffer_head *parent_di_bh,
Tao Ma13821152009-02-25 00:53:23 +08002019 struct ocfs2_alloc_context *ac)
2020{
Tao Maabf1b3c2010-04-27 08:30:36 +08002021 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
Tao Ma13821152009-02-25 00:53:23 +08002022 /*
2023 * Try to allocate inodes from some specific group.
2024 *
2025 * If the parent dir has recorded the last group used in allocation,
2026 * cool, use it. Otherwise if we try to allocate new inode from the
2027 * same slot the parent dir belongs to, use the same chunk.
2028 *
2029 * We are very careful here to avoid the mistake of setting
2030 * ac_last_group to a group descriptor from a different (unlocked) slot.
2031 */
2032 if (OCFS2_I(dir)->ip_last_used_group &&
2033 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2034 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
Tao Maabf1b3c2010-04-27 08:30:36 +08002035 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2036 if (di->i_suballoc_loc)
2037 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2038 else
2039 ac->ac_last_group = ocfs2_which_suballoc_group(
2040 le64_to_cpu(di->i_blkno),
2041 le16_to_cpu(di->i_suballoc_bit));
2042 }
Tao Ma13821152009-02-25 00:53:23 +08002043}
2044
2045static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2046 struct ocfs2_alloc_context *ac)
2047{
2048 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2049 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2050}
2051
Mark Fashehe49e2762010-08-13 15:15:17 -07002052int ocfs2_find_new_inode_loc(struct inode *dir,
2053 struct buffer_head *parent_fe_bh,
2054 struct ocfs2_alloc_context *ac,
2055 u64 *fe_blkno)
2056{
2057 int ret;
2058 handle_t *handle = NULL;
2059 struct ocfs2_suballoc_result *res;
2060
2061 BUG_ON(!ac);
2062 BUG_ON(ac->ac_bits_given != 0);
2063 BUG_ON(ac->ac_bits_wanted != 1);
2064 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2065
2066 res = kzalloc(sizeof(*res), GFP_NOFS);
2067 if (res == NULL) {
2068 ret = -ENOMEM;
2069 mlog_errno(ret);
2070 goto out;
2071 }
2072
2073 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2074
2075 /*
2076 * The handle started here is for chain relink. Alternatively,
2077 * we could just disable relink for these calls.
2078 */
2079 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2080 if (IS_ERR(handle)) {
2081 ret = PTR_ERR(handle);
2082 handle = NULL;
2083 mlog_errno(ret);
2084 goto out;
2085 }
2086
2087 /*
2088 * This will instruct ocfs2_claim_suballoc_bits and
2089 * ocfs2_search_one_group to search but save actual allocation
2090 * for later.
2091 */
2092 ac->ac_find_loc_only = 1;
2093
2094 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2095 if (ret < 0) {
2096 mlog_errno(ret);
2097 goto out;
2098 }
2099
2100 ac->ac_find_loc_priv = res;
2101 *fe_blkno = res->sr_blkno;
2102
2103out:
2104 if (handle)
2105 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2106
2107 if (ret)
2108 kfree(res);
2109
2110 return ret;
2111}
2112
2113int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2114 struct inode *dir,
2115 struct ocfs2_alloc_context *ac,
2116 u64 *suballoc_loc,
2117 u16 *suballoc_bit,
2118 u64 di_blkno)
2119{
2120 int ret;
2121 u16 chain;
2122 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2123 struct buffer_head *bg_bh = NULL;
2124 struct ocfs2_group_desc *bg;
2125 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2126
2127 /*
2128 * Since di_blkno is being passed back in, we check for any
2129 * inconsistencies which may have happened between
2130 * calls. These are code bugs as di_blkno is not expected to
2131 * change once returned from ocfs2_find_new_inode_loc()
2132 */
2133 BUG_ON(res->sr_blkno != di_blkno);
2134
2135 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2136 res->sr_bg_stable_blkno, &bg_bh);
2137 if (ret) {
2138 mlog_errno(ret);
2139 goto out;
2140 }
2141
2142 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2143 chain = le16_to_cpu(bg->bg_chain);
2144
2145 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2146 ac->ac_bh, res->sr_bits,
2147 chain);
2148 if (ret) {
2149 mlog_errno(ret);
2150 goto out;
2151 }
2152
2153 ret = ocfs2_block_group_set_bits(handle,
2154 ac->ac_inode,
2155 bg,
2156 bg_bh,
2157 res->sr_bit_offset,
2158 res->sr_bits);
2159 if (ret < 0) {
2160 mlog_errno(ret);
2161 goto out;
2162 }
2163
Tao Ma2f73e132011-02-22 08:22:33 +08002164 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
2165 res->sr_bits);
Mark Fashehe49e2762010-08-13 15:15:17 -07002166
2167 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2168
2169 BUG_ON(res->sr_bits != 1);
2170
2171 *suballoc_loc = res->sr_bg_blkno;
2172 *suballoc_bit = res->sr_bit_offset;
2173 ac->ac_bits_given++;
2174 ocfs2_save_inode_ac_group(dir, ac);
2175
2176out:
2177 brelse(bg_bh);
2178
2179 return ret;
2180}
2181
Joel Becker1ed9b772010-05-06 13:59:06 +08002182int ocfs2_claim_new_inode(handle_t *handle,
Tao Ma13821152009-02-25 00:53:23 +08002183 struct inode *dir,
2184 struct buffer_head *parent_fe_bh,
Mark Fashehccd979b2005-12-15 14:31:24 -08002185 struct ocfs2_alloc_context *ac,
Joel Becker2b6cb572010-03-26 10:09:15 +08002186 u64 *suballoc_loc,
Mark Fashehccd979b2005-12-15 14:31:24 -08002187 u16 *suballoc_bit,
2188 u64 *fe_blkno)
2189{
2190 int status;
Joel Becker2b6cb572010-03-26 10:09:15 +08002191 struct ocfs2_suballoc_result res;
Mark Fashehccd979b2005-12-15 14:31:24 -08002192
Mark Fashehccd979b2005-12-15 14:31:24 -08002193 BUG_ON(!ac);
2194 BUG_ON(ac->ac_bits_given != 0);
2195 BUG_ON(ac->ac_bits_wanted != 1);
2196 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002197
Tao Ma13821152009-02-25 00:53:23 +08002198 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2199
Joel Beckeraa8f8e92010-03-26 10:08:07 +08002200 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07002201 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002202 1,
2203 1,
Joel Becker7d1fe092010-04-13 14:30:19 +08002204 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002205 if (status < 0) {
2206 mlog_errno(status);
2207 goto bail;
2208 }
Joel Becker1ed9b772010-05-06 13:59:06 +08002209 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
Mark Fashehccd979b2005-12-15 14:31:24 -08002210
Joel Becker7d1fe092010-04-13 14:30:19 +08002211 BUG_ON(res.sr_bits != 1);
Mark Fashehccd979b2005-12-15 14:31:24 -08002212
Joel Becker2b6cb572010-03-26 10:09:15 +08002213 *suballoc_loc = res.sr_bg_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002214 *suballoc_bit = res.sr_bit_offset;
Joel Beckerba206632010-03-26 10:08:59 +08002215 *fe_blkno = res.sr_blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -08002216 ac->ac_bits_given++;
Tao Ma13821152009-02-25 00:53:23 +08002217 ocfs2_save_inode_ac_group(dir, ac);
Mark Fashehccd979b2005-12-15 14:31:24 -08002218 status = 0;
2219bail:
Tao Mac1e8d352011-03-07 16:43:21 +08002220 if (status)
2221 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08002222 return status;
2223}
2224
2225/* translate a group desc. blkno and it's bitmap offset into
2226 * disk cluster offset. */
2227static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2228 u64 bg_blkno,
2229 u16 bg_bit_off)
2230{
2231 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2232 u32 cluster = 0;
2233
2234 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2235
2236 if (bg_blkno != osb->first_cluster_group_blkno)
2237 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2238 cluster += (u32) bg_bit_off;
2239 return cluster;
2240}
2241
2242/* given a cluster offset, calculate which block group it belongs to
2243 * and return that block offset. */
Tao Mad6590722007-12-18 15:47:03 +08002244u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
Mark Fashehccd979b2005-12-15 14:31:24 -08002245{
2246 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2247 u32 group_no;
2248
2249 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2250
2251 group_no = cluster / osb->bitmap_cpg;
2252 if (!group_no)
2253 return osb->first_cluster_group_blkno;
2254 return ocfs2_clusters_to_blocks(inode->i_sb,
2255 group_no * osb->bitmap_cpg);
2256}
2257
2258/* given the block number of a cluster start, calculate which cluster
2259 * group and descriptor bitmap offset that corresponds to. */
2260static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2261 u64 data_blkno,
2262 u64 *bg_blkno,
2263 u16 *bg_bit_off)
2264{
2265 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2266 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2267
2268 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2269
2270 *bg_blkno = ocfs2_which_cluster_group(inode,
2271 data_cluster);
2272
2273 if (*bg_blkno == osb->first_cluster_group_blkno)
2274 *bg_bit_off = (u16) data_cluster;
2275 else
2276 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2277 data_blkno - *bg_blkno);
2278}
2279
2280/*
2281 * min_bits - minimum contiguous chunk from this total allocation we
2282 * can handle. set to what we asked for originally for a full
2283 * contig. allocation, set to '1' to indicate we can deal with extents
2284 * of any size.
2285 */
Joel Becker1ed9b772010-05-06 13:59:06 +08002286int __ocfs2_claim_clusters(handle_t *handle,
Mark Fasheh415cb802007-09-16 20:10:16 -07002287 struct ocfs2_alloc_context *ac,
2288 u32 min_clusters,
2289 u32 max_clusters,
2290 u32 *cluster_start,
2291 u32 *num_clusters)
Mark Fashehccd979b2005-12-15 14:31:24 -08002292{
2293 int status;
Mark Fasheh415cb802007-09-16 20:10:16 -07002294 unsigned int bits_wanted = max_clusters;
Joel Beckerba206632010-03-26 10:08:59 +08002295 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
Joel Becker1ed9b772010-05-06 13:59:06 +08002296 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002297
Mark Fashehccd979b2005-12-15 14:31:24 -08002298 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2299
2300 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2301 && ac->ac_which != OCFS2_AC_USE_MAIN);
Mark Fashehccd979b2005-12-15 14:31:24 -08002302
2303 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
Mark Fasheh33d5d382010-02-24 13:34:09 -08002304 WARN_ON(min_clusters > 1);
2305
Mark Fashehccd979b2005-12-15 14:31:24 -08002306 status = ocfs2_claim_local_alloc_bits(osb,
2307 handle,
2308 ac,
2309 bits_wanted,
2310 cluster_start,
2311 num_clusters);
2312 if (!status)
2313 atomic_inc(&osb->alloc_stats.local_data);
2314 } else {
2315 if (min_clusters > (osb->bitmap_cpg - 1)) {
2316 /* The only paths asking for contiguousness
2317 * should know about this already. */
Sunil Mushran2fbe8d12007-12-20 14:58:11 -08002318 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2319 "group bitmap size %u!\n", min_clusters,
2320 osb->bitmap_cpg);
Mark Fashehccd979b2005-12-15 14:31:24 -08002321 status = -ENOSPC;
2322 goto bail;
2323 }
2324 /* clamp the current request down to a realistic size. */
2325 if (bits_wanted > (osb->bitmap_cpg - 1))
2326 bits_wanted = osb->bitmap_cpg - 1;
2327
Joel Beckeraa8f8e92010-03-26 10:08:07 +08002328 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07002329 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002330 bits_wanted,
2331 min_clusters,
Joel Becker7d1fe092010-04-13 14:30:19 +08002332 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002333 if (!status) {
Joel Beckerba206632010-03-26 10:08:59 +08002334 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
Mark Fashehccd979b2005-12-15 14:31:24 -08002335 *cluster_start =
2336 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
Joel Becker7d1fe092010-04-13 14:30:19 +08002337 res.sr_bg_blkno,
2338 res.sr_bit_offset);
Mark Fashehccd979b2005-12-15 14:31:24 -08002339 atomic_inc(&osb->alloc_stats.bitmap_data);
Tao Ma47119542010-04-22 14:09:15 +08002340 *num_clusters = res.sr_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -08002341 }
2342 }
2343 if (status < 0) {
2344 if (status != -ENOSPC)
2345 mlog_errno(status);
2346 goto bail;
2347 }
2348
Tao Ma47119542010-04-22 14:09:15 +08002349 ac->ac_bits_given += *num_clusters;
Mark Fashehccd979b2005-12-15 14:31:24 -08002350
2351bail:
Tao Mac1e8d352011-03-07 16:43:21 +08002352 if (status)
2353 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08002354 return status;
2355}
2356
Joel Becker1ed9b772010-05-06 13:59:06 +08002357int ocfs2_claim_clusters(handle_t *handle,
Mark Fasheh415cb802007-09-16 20:10:16 -07002358 struct ocfs2_alloc_context *ac,
2359 u32 min_clusters,
2360 u32 *cluster_start,
2361 u32 *num_clusters)
2362{
2363 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2364
Joel Becker1ed9b772010-05-06 13:59:06 +08002365 return __ocfs2_claim_clusters(handle, ac, min_clusters,
Mark Fasheh415cb802007-09-16 20:10:16 -07002366 bits_wanted, cluster_start, num_clusters);
2367}
2368
Mark Fashehb4414ee2010-03-11 18:31:09 -08002369static int ocfs2_block_group_clear_bits(handle_t *handle,
2370 struct inode *alloc_inode,
2371 struct ocfs2_group_desc *bg,
2372 struct buffer_head *group_bh,
2373 unsigned int bit_off,
2374 unsigned int num_bits,
2375 void (*undo_fn)(unsigned int bit,
2376 unsigned long *bmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002377{
2378 int status;
2379 unsigned int tmp;
Mark Fashehccd979b2005-12-15 14:31:24 -08002380 struct ocfs2_group_desc *undo_bg = NULL;
2381
Joel Becker42035302008-11-13 14:49:15 -08002382 /* The caller got this descriptor from
2383 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2384 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08002385
Tao Ma2f73e132011-02-22 08:22:33 +08002386 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08002387
Mark Fashehb4414ee2010-03-11 18:31:09 -08002388 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
Joel Becker0cf2f762009-02-12 16:41:25 -08002389 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
Mark Fashehb4414ee2010-03-11 18:31:09 -08002390 group_bh,
2391 undo_fn ?
2392 OCFS2_JOURNAL_ACCESS_UNDO :
2393 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002394 if (status < 0) {
2395 mlog_errno(status);
2396 goto bail;
2397 }
2398
Mark Fashehb4414ee2010-03-11 18:31:09 -08002399 if (undo_fn) {
Sunil Mushran94e41ec2009-06-19 14:45:54 -07002400 jbd_lock_bh_state(group_bh);
2401 undo_bg = (struct ocfs2_group_desc *)
2402 bh2jh(group_bh)->b_committed_data;
2403 BUG_ON(!undo_bg);
2404 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002405
2406 tmp = num_bits;
2407 while(tmp--) {
2408 ocfs2_clear_bit((bit_off + tmp),
2409 (unsigned long *) bg->bg_bitmap);
Mark Fashehb4414ee2010-03-11 18:31:09 -08002410 if (undo_fn)
2411 undo_fn(bit_off + tmp,
2412 (unsigned long *) undo_bg->bg_bitmap);
Mark Fashehccd979b2005-12-15 14:31:24 -08002413 }
2414 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
Srinivas Eeda9b5cd102010-10-05 15:53:06 -07002415 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2416 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
2417 " count %u but claims %u are freed. num_bits %d",
2418 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2419 le16_to_cpu(bg->bg_bits),
2420 le16_to_cpu(bg->bg_free_bits_count), num_bits);
2421 return -EROFS;
2422 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002423
Mark Fashehb4414ee2010-03-11 18:31:09 -08002424 if (undo_fn)
Sunil Mushran94e41ec2009-06-19 14:45:54 -07002425 jbd_unlock_bh_state(group_bh);
2426
Joel Beckerec20cec2010-03-19 14:13:52 -07002427 ocfs2_journal_dirty(handle, group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002428bail:
2429 return status;
2430}
2431
2432/*
2433 * expects the suballoc inode to already be locked.
2434 */
Mark Fashehb4414ee2010-03-11 18:31:09 -08002435static int _ocfs2_free_suballoc_bits(handle_t *handle,
2436 struct inode *alloc_inode,
2437 struct buffer_head *alloc_bh,
2438 unsigned int start_bit,
2439 u64 bg_blkno,
2440 unsigned int count,
2441 void (*undo_fn)(unsigned int bit,
2442 unsigned long *bitmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002443{
2444 int status = 0;
2445 u32 tmp_used;
Mark Fashehccd979b2005-12-15 14:31:24 -08002446 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2447 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2448 struct buffer_head *group_bh = NULL;
2449 struct ocfs2_group_desc *group;
2450
Joel Becker10995aa2008-11-13 14:49:12 -08002451 /* The alloc_bh comes from ocfs2_free_dinode() or
2452 * ocfs2_free_clusters(). The callers have all locked the
2453 * allocator and gotten alloc_bh from the lock call. This
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002454 * validates the dinode buffer. Any corruption that has happened
Joel Becker10995aa2008-11-13 14:49:12 -08002455 * is a code bug. */
2456 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
Mark Fashehccd979b2005-12-15 14:31:24 -08002457 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2458
Tao Ma2f73e132011-02-22 08:22:33 +08002459 trace_ocfs2_free_suballoc_bits(
2460 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
2461 (unsigned long long)bg_blkno,
2462 start_bit, count);
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
Tao Mac1e8d352011-03-07 16:43:21 +08002498 if (status)
2499 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08002500 return status;
2501}
2502
Mark Fashehb4414ee2010-03-11 18:31:09 -08002503int ocfs2_free_suballoc_bits(handle_t *handle,
2504 struct inode *alloc_inode,
2505 struct buffer_head *alloc_bh,
2506 unsigned int start_bit,
2507 u64 bg_blkno,
2508 unsigned int count)
2509{
2510 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2511 start_bit, bg_blkno, count, NULL);
2512}
2513
Mark Fasheh1fabe142006-10-09 18:11:45 -07002514int ocfs2_free_dinode(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002515 struct inode *inode_alloc_inode,
2516 struct buffer_head *inode_alloc_bh,
2517 struct ocfs2_dinode *di)
2518{
2519 u64 blk = le64_to_cpu(di->i_blkno);
2520 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2521 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2522
Tao Ma74380c42010-03-22 14:20:18 +08002523 if (di->i_suballoc_loc)
2524 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
Mark Fashehccd979b2005-12-15 14:31:24 -08002525 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2526 inode_alloc_bh, bit, bg_blkno, 1);
2527}
2528
Mark Fashehb4414ee2010-03-11 18:31:09 -08002529static int _ocfs2_free_clusters(handle_t *handle,
2530 struct inode *bitmap_inode,
2531 struct buffer_head *bitmap_bh,
2532 u64 start_blk,
2533 unsigned int num_clusters,
2534 void (*undo_fn)(unsigned int bit,
2535 unsigned long *bitmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002536{
2537 int status;
2538 u16 bg_start_bit;
2539 u64 bg_blkno;
2540 struct ocfs2_dinode *fe;
2541
2542 /* You can't ever have a contiguous set of clusters
2543 * bigger than a block group bitmap so we never have to worry
Tao Maef6b6892011-02-21 11:10:44 +08002544 * about looping on them.
2545 * This is expensive. We can safely remove once this stuff has
Mark Fashehccd979b2005-12-15 14:31:24 -08002546 * gotten tested really well. */
2547 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk)));
2548
2549 fe = (struct ocfs2_dinode *) bitmap_bh->b_data;
2550
2551 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2552 &bg_start_bit);
2553
Tao Ma2f73e132011-02-22 08:22:33 +08002554 trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
2555 (unsigned long long)start_blk,
2556 bg_start_bit, num_clusters);
Mark Fashehccd979b2005-12-15 14:31:24 -08002557
Mark Fashehb4414ee2010-03-11 18:31:09 -08002558 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2559 bg_start_bit, bg_blkno,
2560 num_clusters, undo_fn);
Mark Fasheh9c7af402008-07-28 18:02:53 -07002561 if (status < 0) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002562 mlog_errno(status);
Mark Fasheh9c7af402008-07-28 18:02:53 -07002563 goto out;
2564 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002565
Mark Fasheh9c7af402008-07-28 18:02:53 -07002566 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2567 num_clusters);
2568
2569out:
Tao Mac1e8d352011-03-07 16:43:21 +08002570 if (status)
2571 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08002572 return status;
2573}
2574
Mark Fashehb4414ee2010-03-11 18:31:09 -08002575int ocfs2_free_clusters(handle_t *handle,
2576 struct inode *bitmap_inode,
2577 struct buffer_head *bitmap_bh,
2578 u64 start_blk,
2579 unsigned int num_clusters)
2580{
2581 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2582 start_blk, num_clusters,
2583 _ocfs2_set_bit);
2584}
2585
2586/*
2587 * Give never-used clusters back to the global bitmap. We don't need
2588 * to protect these bits in the undo buffer.
2589 */
2590int ocfs2_release_clusters(handle_t *handle,
2591 struct inode *bitmap_inode,
2592 struct buffer_head *bitmap_bh,
2593 u64 start_blk,
2594 unsigned int num_clusters)
2595{
2596 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2597 start_blk, num_clusters,
2598 _ocfs2_clear_bit);
2599}
2600
Mark Fashehccd979b2005-12-15 14:31:24 -08002601static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg)
2602{
2603 printk("Block Group:\n");
2604 printk("bg_signature: %s\n", bg->bg_signature);
2605 printk("bg_size: %u\n", bg->bg_size);
2606 printk("bg_bits: %u\n", bg->bg_bits);
2607 printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count);
2608 printk("bg_chain: %u\n", bg->bg_chain);
2609 printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation));
Mark Fashehb06970532006-03-03 10:24:33 -08002610 printk("bg_next_group: %llu\n",
2611 (unsigned long long)bg->bg_next_group);
2612 printk("bg_parent_dinode: %llu\n",
2613 (unsigned long long)bg->bg_parent_dinode);
2614 printk("bg_blkno: %llu\n",
2615 (unsigned long long)bg->bg_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002616}
2617
2618static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
2619{
2620 int i;
2621
Mark Fashehb06970532006-03-03 10:24:33 -08002622 printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002623 printk("i_signature: %s\n", fe->i_signature);
Mark Fashehb06970532006-03-03 10:24:33 -08002624 printk("i_size: %llu\n",
2625 (unsigned long long)fe->i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -08002626 printk("i_clusters: %u\n", fe->i_clusters);
2627 printk("i_generation: %u\n",
2628 le32_to_cpu(fe->i_generation));
2629 printk("id1.bitmap1.i_used: %u\n",
2630 le32_to_cpu(fe->id1.bitmap1.i_used));
2631 printk("id1.bitmap1.i_total: %u\n",
2632 le32_to_cpu(fe->id1.bitmap1.i_total));
2633 printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg);
2634 printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc);
2635 printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count);
2636 printk("id2.i_chain.cl_next_free_rec: %u\n",
2637 fe->id2.i_chain.cl_next_free_rec);
2638 for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) {
2639 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i,
2640 fe->id2.i_chain.cl_recs[i].c_free);
2641 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i,
2642 fe->id2.i_chain.cl_recs[i].c_total);
Mark Fashehb06970532006-03-03 10:24:33 -08002643 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i,
2644 (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002645 }
2646}
Tao Mae7d4cb62008-08-18 17:38:44 +08002647
2648/*
2649 * For a given allocation, determine which allocators will need to be
2650 * accessed, and lock them, reserving the appropriate number of bits.
2651 *
2652 * Sparse file systems call this from ocfs2_write_begin_nolock()
2653 * and ocfs2_allocate_unwritten_extents().
2654 *
2655 * File systems which don't support holes call this from
2656 * ocfs2_extend_allocation().
2657 */
Joel Beckerf99b9b72008-08-20 19:36:33 -07002658int ocfs2_lock_allocators(struct inode *inode,
2659 struct ocfs2_extent_tree *et,
Tao Mae7d4cb62008-08-18 17:38:44 +08002660 u32 clusters_to_add, u32 extents_to_split,
2661 struct ocfs2_alloc_context **data_ac,
Joel Beckerf99b9b72008-08-20 19:36:33 -07002662 struct ocfs2_alloc_context **meta_ac)
Tao Mae7d4cb62008-08-18 17:38:44 +08002663{
2664 int ret = 0, num_free_extents;
2665 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2666 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2667
2668 *meta_ac = NULL;
2669 if (data_ac)
2670 *data_ac = NULL;
2671
2672 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2673
Joel Becker3d03a302009-02-12 17:49:26 -08002674 num_free_extents = ocfs2_num_free_extents(osb, et);
Tao Mae7d4cb62008-08-18 17:38:44 +08002675 if (num_free_extents < 0) {
2676 ret = num_free_extents;
2677 mlog_errno(ret);
2678 goto out;
2679 }
2680
2681 /*
2682 * Sparse allocation file systems need to be more conservative
2683 * with reserving room for expansion - the actual allocation
2684 * happens while we've got a journal handle open so re-taking
2685 * a cluster lock (because we ran out of room for another
2686 * extent) will violate ordering rules.
2687 *
2688 * Most of the time we'll only be seeing this 1 cluster at a time
2689 * anyway.
2690 *
2691 * Always lock for any unwritten extents - we might want to
2692 * add blocks during a split.
2693 */
2694 if (!num_free_extents ||
2695 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
Joel Beckerf99b9b72008-08-20 19:36:33 -07002696 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
Tao Mae7d4cb62008-08-18 17:38:44 +08002697 if (ret < 0) {
2698 if (ret != -ENOSPC)
2699 mlog_errno(ret);
2700 goto out;
2701 }
2702 }
2703
2704 if (clusters_to_add == 0)
2705 goto out;
2706
2707 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2708 if (ret < 0) {
2709 if (ret != -ENOSPC)
2710 mlog_errno(ret);
2711 goto out;
2712 }
2713
2714out:
2715 if (ret) {
2716 if (*meta_ac) {
2717 ocfs2_free_alloc_context(*meta_ac);
2718 *meta_ac = NULL;
2719 }
2720
2721 /*
2722 * We cannot have an error and a non null *data_ac.
2723 */
2724 }
2725
2726 return ret;
2727}
wengang wang6ca497a2009-03-06 21:29:10 +08002728
2729/*
2730 * Read the inode specified by blkno to get suballoc_slot and
2731 * suballoc_bit.
2732 */
2733static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
Tao Ma889f0042010-09-02 13:10:10 +08002734 u16 *suballoc_slot, u64 *group_blkno,
2735 u16 *suballoc_bit)
wengang wang6ca497a2009-03-06 21:29:10 +08002736{
2737 int status;
2738 struct buffer_head *inode_bh = NULL;
2739 struct ocfs2_dinode *inode_fe;
2740
Tao Ma2f73e132011-02-22 08:22:33 +08002741 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002742
2743 /* dirty read disk */
2744 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2745 if (status < 0) {
Joel Becker5b09b502009-04-21 16:31:20 -07002746 mlog(ML_ERROR, "read block %llu failed %d\n",
2747 (unsigned long long)blkno, status);
wengang wang6ca497a2009-03-06 21:29:10 +08002748 goto bail;
2749 }
2750
2751 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2752 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
Joel Becker5b09b502009-04-21 16:31:20 -07002753 mlog(ML_ERROR, "invalid inode %llu requested\n",
2754 (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002755 status = -EINVAL;
2756 goto bail;
2757 }
2758
Tao Ma0fba8132009-03-19 05:08:43 +08002759 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
wengang wang6ca497a2009-03-06 21:29:10 +08002760 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2761 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
Joel Becker5b09b502009-04-21 16:31:20 -07002762 (unsigned long long)blkno,
2763 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
wengang wang6ca497a2009-03-06 21:29:10 +08002764 status = -EINVAL;
2765 goto bail;
2766 }
2767
2768 if (suballoc_slot)
2769 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2770 if (suballoc_bit)
2771 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
Tao Ma889f0042010-09-02 13:10:10 +08002772 if (group_blkno)
2773 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
wengang wang6ca497a2009-03-06 21:29:10 +08002774
2775bail:
2776 brelse(inode_bh);
2777
Tao Mac1e8d352011-03-07 16:43:21 +08002778 if (status)
2779 mlog_errno(status);
wengang wang6ca497a2009-03-06 21:29:10 +08002780 return status;
2781}
2782
2783/*
2784 * test whether bit is SET in allocator bitmap or not. on success, 0
2785 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2786 * is returned and *res is meaningless. Call this after you have
2787 * cluster locked against suballoc, or you may get a result based on
2788 * non-up2date contents
2789 */
2790static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2791 struct inode *suballoc,
Tao Ma889f0042010-09-02 13:10:10 +08002792 struct buffer_head *alloc_bh,
2793 u64 group_blkno, u64 blkno,
wengang wang6ca497a2009-03-06 21:29:10 +08002794 u16 bit, int *res)
2795{
Tao Maabf1b3c2010-04-27 08:30:36 +08002796 struct ocfs2_dinode *alloc_di;
wengang wang6ca497a2009-03-06 21:29:10 +08002797 struct ocfs2_group_desc *group;
2798 struct buffer_head *group_bh = NULL;
2799 u64 bg_blkno;
2800 int status;
2801
Tao Ma2f73e132011-02-22 08:22:33 +08002802 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
2803 (unsigned int)bit);
wengang wang6ca497a2009-03-06 21:29:10 +08002804
Tao Maabf1b3c2010-04-27 08:30:36 +08002805 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2806 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
wengang wang6ca497a2009-03-06 21:29:10 +08002807 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2808 (unsigned int)bit,
Tao Maabf1b3c2010-04-27 08:30:36 +08002809 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
wengang wang6ca497a2009-03-06 21:29:10 +08002810 status = -EINVAL;
2811 goto bail;
2812 }
2813
Tao Ma889f0042010-09-02 13:10:10 +08002814 bg_blkno = group_blkno ? group_blkno :
2815 ocfs2_which_suballoc_group(blkno, bit);
Tao Maabf1b3c2010-04-27 08:30:36 +08002816 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
wengang wang6ca497a2009-03-06 21:29:10 +08002817 &group_bh);
2818 if (status < 0) {
Joel Becker5b09b502009-04-21 16:31:20 -07002819 mlog(ML_ERROR, "read group %llu failed %d\n",
2820 (unsigned long long)bg_blkno, status);
wengang wang6ca497a2009-03-06 21:29:10 +08002821 goto bail;
2822 }
2823
2824 group = (struct ocfs2_group_desc *) group_bh->b_data;
2825 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2826
2827bail:
2828 brelse(group_bh);
2829
Tao Mac1e8d352011-03-07 16:43:21 +08002830 if (status)
2831 mlog_errno(status);
wengang wang6ca497a2009-03-06 21:29:10 +08002832 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
Tao Ma2f73e132011-02-22 08:22:33 +08002856 trace_ocfs2_test_inode_bit((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:
Tao Mac1e8d352011-03-07 16:43:21 +08002897 if (status)
2898 mlog_errno(status);
wengang wang6ca497a2009-03-06 21:29:10 +08002899 return status;
2900}