blob: 64f2c50a1c37532c855e0e1243a42c657c35044c [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * suballoc.c
5 *
6 * metadata alloc and free
7 * Inspired by ext3 block groups.
8 *
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
25 */
26
27#include <linux/fs.h>
28#include <linux/types.h>
29#include <linux/slab.h>
30#include <linux/highmem.h>
31
32#define MLOG_MASK_PREFIX ML_DISK_ALLOC
33#include <cluster/masklog.h>
34
35#include "ocfs2.h"
36
37#include "alloc.h"
Joel Beckerd6b32bb2008-10-17 14:55:01 -070038#include "blockcheck.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080039#include "dlmglue.h"
40#include "inode.h"
41#include "journal.h"
42#include "localalloc.h"
43#include "suballoc.h"
44#include "super.h"
45#include "sysfile.h"
46#include "uptodate.h"
47
48#include "buffer_head_io.h"
49
Tao Maffda89a2008-03-03 17:12:09 +080050#define NOT_ALLOC_NEW_GROUP 0
Tao Ma60ca81e2009-02-25 00:53:24 +080051#define ALLOC_NEW_GROUP 0x1
52#define ALLOC_GROUPS_FROM_GLOBAL 0x2
Tao Maffda89a2008-03-03 17:12:09 +080053
Tiger Yangb89c5422010-01-25 14:11:06 +080054#define OCFS2_MAX_TO_STEAL 1024
Tao Ma4d0ddb22008-03-05 16:11:46 +080055
Joel Becker7d1fe092010-04-13 14:30:19 +080056struct ocfs2_suballoc_result {
Joel Becker2b6cb572010-03-26 10:09:15 +080057 u64 sr_bg_blkno; /* The bg we allocated from. Set
58 to 0 when a block group is
59 contiguous. */
Mark Fashehe49e2762010-08-13 15:15:17 -070060 u64 sr_bg_stable_blkno; /*
61 * Doesn't change, always
62 * set to target block
63 * group descriptor
64 * block.
65 */
Joel Beckerba206632010-03-26 10:08:59 +080066 u64 sr_blkno; /* The first allocated block */
Joel Becker7d1fe092010-04-13 14:30:19 +080067 unsigned int sr_bit_offset; /* The bit in the bg */
68 unsigned int sr_bits; /* How many bits we claimed */
69};
70
Mark Fashehb2b6ebf2010-08-26 13:06:50 -070071static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
72{
73 if (res->sr_blkno == 0)
74 return 0;
75
76 if (res->sr_bg_blkno)
77 return res->sr_bg_blkno;
78
79 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
80}
81
Mark Fashehccd979b2005-12-15 14:31:24 -080082static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg);
83static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe);
84static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
Mark Fasheh1fabe142006-10-09 18:11:45 -070085static int ocfs2_block_group_fill(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -080086 struct inode *alloc_inode,
87 struct buffer_head *bg_bh,
88 u64 group_blkno,
Joel Becker798db352010-04-13 14:26:32 +080089 unsigned int group_clusters,
Mark Fashehccd979b2005-12-15 14:31:24 -080090 u16 my_chain,
91 struct ocfs2_chain_list *cl);
92static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
93 struct inode *alloc_inode,
Joel Becker1187c962008-09-03 20:03:39 -070094 struct buffer_head *bh,
Tao Ma60ca81e2009-02-25 00:53:24 +080095 u64 max_block,
Tao Mafeb473a2009-02-25 00:53:25 +080096 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +080097 int flags);
Mark Fashehccd979b2005-12-15 14:31:24 -080098
Mark Fashehccd979b2005-12-15 14:31:24 -080099static int ocfs2_cluster_group_search(struct inode *inode,
100 struct buffer_head *group_bh,
101 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -0700102 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +0800103 struct ocfs2_suballoc_result *res);
Mark Fashehccd979b2005-12-15 14:31:24 -0800104static int ocfs2_block_group_search(struct inode *inode,
105 struct buffer_head *group_bh,
106 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -0700107 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +0800108 struct ocfs2_suballoc_result *res);
Joel Beckeraa8f8e92010-03-26 10:08:07 +0800109static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -0700110 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800111 u32 bits_wanted,
112 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +0800113 struct ocfs2_suballoc_result *res);
Mark Fashehccd979b2005-12-15 14:31:24 -0800114static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
115 int nr);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700116static inline int ocfs2_block_group_set_bits(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800117 struct inode *alloc_inode,
118 struct ocfs2_group_desc *bg,
119 struct buffer_head *group_bh,
120 unsigned int bit_off,
121 unsigned int num_bits);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700122static int ocfs2_relink_block_group(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800123 struct inode *alloc_inode,
124 struct buffer_head *fe_bh,
125 struct buffer_head *bg_bh,
126 struct buffer_head *prev_bg_bh,
127 u16 chain);
128static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
129 u32 wanted);
Mark Fashehccd979b2005-12-15 14:31:24 -0800130static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
131 u64 bg_blkno,
132 u16 bg_bit_off);
Mark Fashehccd979b2005-12-15 14:31:24 -0800133static inline void ocfs2_block_to_cluster_group(struct inode *inode,
134 u64 data_blkno,
135 u64 *bg_blkno,
136 u16 *bg_bit_off);
Joel Becker1187c962008-09-03 20:03:39 -0700137static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
138 u32 bits_wanted, u64 max_block,
Tao Ma60ca81e2009-02-25 00:53:24 +0800139 int flags,
Joel Becker1187c962008-09-03 20:03:39 -0700140 struct ocfs2_alloc_context **ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800141
Mark Fasheh9c7af402008-07-28 18:02:53 -0700142void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
Mark Fashehccd979b2005-12-15 14:31:24 -0800143{
Mark Fashehda5cbf22006-10-06 18:34:35 -0700144 struct inode *inode = ac->ac_inode;
145
146 if (inode) {
147 if (ac->ac_which != OCFS2_AC_USE_LOCAL)
Mark Fashehe63aecb62007-10-18 15:30:42 -0700148 ocfs2_inode_unlock(inode, 1);
Mark Fashehda5cbf22006-10-06 18:34:35 -0700149
150 mutex_unlock(&inode->i_mutex);
151
152 iput(inode);
Tao Ma4d0ddb22008-03-05 16:11:46 +0800153 ac->ac_inode = NULL;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700154 }
Mark Fasheha81cb882008-10-07 14:25:16 -0700155 brelse(ac->ac_bh);
156 ac->ac_bh = NULL;
Mark Fashehe3b4a972009-12-07 13:16:07 -0800157 ac->ac_resv = NULL;
Mark Fashehe49e2762010-08-13 15:15:17 -0700158 if (ac->ac_find_loc_priv) {
159 kfree(ac->ac_find_loc_priv);
160 ac->ac_find_loc_priv = NULL;
161 }
Tao Ma4d0ddb22008-03-05 16:11:46 +0800162}
163
164void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
165{
166 ocfs2_free_ac_resource(ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800167 kfree(ac);
168}
169
170static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
171{
172 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
173}
174
Joel Becker57e3e792008-11-13 14:49:13 -0800175#define do_error(fmt, ...) \
176 do{ \
Tao Ma78c37eb2010-03-03 11:26:27 +0800177 if (resize) \
Joel Becker57e3e792008-11-13 14:49:13 -0800178 mlog(ML_ERROR, fmt "\n", ##__VA_ARGS__); \
179 else \
180 ocfs2_error(sb, fmt, ##__VA_ARGS__); \
181 } while (0)
182
Joel Becker970e4932008-11-13 14:49:19 -0800183static int ocfs2_validate_gd_self(struct super_block *sb,
184 struct buffer_head *bh,
Tao Ma78c37eb2010-03-03 11:26:27 +0800185 int resize)
Joel Becker970e4932008-11-13 14:49:19 -0800186{
187 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
188
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700189 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
Joel Becker68f64d42008-11-13 14:49:14 -0800190 do_error("Group descriptor #%llu has bad signature %.*s",
191 (unsigned long long)bh->b_blocknr, 7,
Joel Becker57e3e792008-11-13 14:49:13 -0800192 gd->bg_signature);
193 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700194 }
195
Joel Becker68f64d42008-11-13 14:49:14 -0800196 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
197 do_error("Group descriptor #%llu has an invalid bg_blkno "
198 "of %llu",
199 (unsigned long long)bh->b_blocknr,
200 (unsigned long long)le64_to_cpu(gd->bg_blkno));
201 return -EINVAL;
202 }
203
204 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
205 do_error("Group descriptor #%llu has an invalid "
206 "fs_generation of #%u",
207 (unsigned long long)bh->b_blocknr,
208 le32_to_cpu(gd->bg_generation));
209 return -EINVAL;
210 }
211
Joel Becker970e4932008-11-13 14:49:19 -0800212 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
213 do_error("Group descriptor #%llu has bit count %u but "
214 "claims that %u are free",
215 (unsigned long long)bh->b_blocknr,
216 le16_to_cpu(gd->bg_bits),
217 le16_to_cpu(gd->bg_free_bits_count));
218 return -EINVAL;
219 }
220
221 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
222 do_error("Group descriptor #%llu has bit count %u but "
223 "max bitmap bits of %u",
224 (unsigned long long)bh->b_blocknr,
225 le16_to_cpu(gd->bg_bits),
226 8 * le16_to_cpu(gd->bg_size));
227 return -EINVAL;
228 }
229
230 return 0;
231}
232
233static int ocfs2_validate_gd_parent(struct super_block *sb,
234 struct ocfs2_dinode *di,
235 struct buffer_head *bh,
Tao Ma78c37eb2010-03-03 11:26:27 +0800236 int resize)
Joel Becker970e4932008-11-13 14:49:19 -0800237{
238 unsigned int max_bits;
239 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
240
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700241 if (di->i_blkno != gd->bg_parent_dinode) {
Joel Becker68f64d42008-11-13 14:49:14 -0800242 do_error("Group descriptor #%llu has bad parent "
Joel Becker57e3e792008-11-13 14:49:13 -0800243 "pointer (%llu, expected %llu)",
Joel Becker68f64d42008-11-13 14:49:14 -0800244 (unsigned long long)bh->b_blocknr,
Joel Becker57e3e792008-11-13 14:49:13 -0800245 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
246 (unsigned long long)le64_to_cpu(di->i_blkno));
247 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700248 }
249
250 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
251 if (le16_to_cpu(gd->bg_bits) > max_bits) {
Joel Becker68f64d42008-11-13 14:49:14 -0800252 do_error("Group descriptor #%llu has bit count of %u",
253 (unsigned long long)bh->b_blocknr,
Joel Becker57e3e792008-11-13 14:49:13 -0800254 le16_to_cpu(gd->bg_bits));
255 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700256 }
257
Tao Ma78c37eb2010-03-03 11:26:27 +0800258 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
259 if ((le16_to_cpu(gd->bg_chain) >
260 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
261 ((le16_to_cpu(gd->bg_chain) ==
262 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
Joel Becker68f64d42008-11-13 14:49:14 -0800263 do_error("Group descriptor #%llu has bad chain %u",
264 (unsigned long long)bh->b_blocknr,
Joel Becker57e3e792008-11-13 14:49:13 -0800265 le16_to_cpu(gd->bg_chain));
266 return -EINVAL;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700267 }
268
Joel Becker970e4932008-11-13 14:49:19 -0800269 return 0;
270}
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700271
Joel Becker57e3e792008-11-13 14:49:13 -0800272#undef do_error
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700273
Joel Becker970e4932008-11-13 14:49:19 -0800274/*
275 * This version only prints errors. It does not fail the filesystem, and
276 * exists only for resize.
277 */
278int ocfs2_check_group_descriptor(struct super_block *sb,
279 struct ocfs2_dinode *di,
280 struct buffer_head *bh)
281{
282 int rc;
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700283 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
Joel Becker970e4932008-11-13 14:49:19 -0800284
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700285 BUG_ON(!buffer_uptodate(bh));
286
287 /*
288 * If the ecc fails, we return the error but otherwise
289 * leave the filesystem running. We know any error is
290 * local to this block.
291 */
292 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
Joel Becker13723d02008-10-17 19:25:01 -0700293 if (rc) {
294 mlog(ML_ERROR,
295 "Checksum failed for group descriptor %llu\n",
296 (unsigned long long)bh->b_blocknr);
297 } else
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700298 rc = ocfs2_validate_gd_self(sb, bh, 1);
Joel Becker970e4932008-11-13 14:49:19 -0800299 if (!rc)
300 rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
301
302 return rc;
303}
304
305static int ocfs2_validate_group_descriptor(struct super_block *sb,
306 struct buffer_head *bh)
307{
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700308 int rc;
309 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
310
Joel Becker970e4932008-11-13 14:49:19 -0800311 mlog(0, "Validating group descriptor %llu\n",
312 (unsigned long long)bh->b_blocknr);
313
Joel Beckerd6b32bb2008-10-17 14:55:01 -0700314 BUG_ON(!buffer_uptodate(bh));
315
316 /*
317 * If the ecc fails, we return the error but otherwise
318 * leave the filesystem running. We know any error is
319 * local to this block.
320 */
321 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
322 if (rc)
323 return rc;
324
325 /*
326 * Errors after here are fatal.
327 */
328
Joel Becker970e4932008-11-13 14:49:19 -0800329 return ocfs2_validate_gd_self(sb, bh, 0);
Mark Fasheh7bf72ed2006-05-03 17:46:50 -0700330}
331
Joel Becker68f64d42008-11-13 14:49:14 -0800332int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
333 u64 gd_blkno, struct buffer_head **bh)
334{
335 int rc;
336 struct buffer_head *tmp = *bh;
337
Joel Becker8cb471e2009-02-10 20:00:41 -0800338 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
Joel Becker970e4932008-11-13 14:49:19 -0800339 ocfs2_validate_group_descriptor);
Joel Becker68f64d42008-11-13 14:49:14 -0800340 if (rc)
341 goto out;
342
Joel Becker970e4932008-11-13 14:49:19 -0800343 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
Joel Becker68f64d42008-11-13 14:49:14 -0800344 if (rc) {
345 brelse(tmp);
346 goto out;
347 }
348
349 /* If ocfs2_read_block() got us a new bh, pass it up. */
350 if (!*bh)
351 *bh = tmp;
352
353out:
354 return rc;
355}
356
Joel Becker798db352010-04-13 14:26:32 +0800357static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
358 struct ocfs2_group_desc *bg,
359 struct ocfs2_chain_list *cl,
360 u64 p_blkno, u32 clusters)
361{
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));
372 rec->e_leaf_clusters = cpu_to_le32(clusters);
373 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
Tao Ma47119542010-04-22 14:09:15 +0800374 le16_add_cpu(&bg->bg_free_bits_count,
375 clusters * le16_to_cpu(cl->cl_bpc));
Joel Becker798db352010-04-13 14:26:32 +0800376 le16_add_cpu(&el->l_next_free_rec, 1);
377}
378
Mark Fasheh1fabe142006-10-09 18:11:45 -0700379static int ocfs2_block_group_fill(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800380 struct inode *alloc_inode,
381 struct buffer_head *bg_bh,
382 u64 group_blkno,
Joel Becker798db352010-04-13 14:26:32 +0800383 unsigned int group_clusters,
Mark Fashehccd979b2005-12-15 14:31:24 -0800384 u16 my_chain,
385 struct ocfs2_chain_list *cl)
386{
387 int status = 0;
Joel Becker798db352010-04-13 14:26:32 +0800388 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800389 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
390 struct super_block * sb = alloc_inode->i_sb;
391
392 mlog_entry_void();
393
394 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
Mark Fashehb0697052006-03-03 10:24:33 -0800395 ocfs2_error(alloc_inode->i_sb, "group block (%llu) != "
396 "b_blocknr (%llu)",
397 (unsigned long long)group_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -0800398 (unsigned long long) bg_bh->b_blocknr);
399 status = -EIO;
400 goto bail;
401 }
402
Joel Becker13723d02008-10-17 19:25:01 -0700403 status = ocfs2_journal_access_gd(handle,
Joel Becker0cf2f762009-02-12 16:41:25 -0800404 INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -0700405 bg_bh,
406 OCFS2_JOURNAL_ACCESS_CREATE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800407 if (status < 0) {
408 mlog_errno(status);
409 goto bail;
410 }
411
412 memset(bg, 0, sb->s_blocksize);
413 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
414 bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
Tao Ma85718822010-04-13 14:38:06 +0800415 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
416 osb->s_feature_incompat));
Mark Fashehccd979b2005-12-15 14:31:24 -0800417 bg->bg_chain = cpu_to_le16(my_chain);
418 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
419 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
420 bg->bg_blkno = cpu_to_le64(group_blkno);
Joel Becker798db352010-04-13 14:26:32 +0800421 if (group_clusters == le16_to_cpu(cl->cl_cpg))
422 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
423 else
Tao Ma47119542010-04-22 14:09:15 +0800424 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
Joel Becker798db352010-04-13 14:26:32 +0800425 group_clusters);
426
Mark Fashehccd979b2005-12-15 14:31:24 -0800427 /* set the 1st bit in the bitmap to account for the descriptor block */
428 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
429 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
430
Joel Beckerec20cec2010-03-19 14:13:52 -0700431 ocfs2_journal_dirty(handle, bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800432
433 /* There is no need to zero out or otherwise initialize the
434 * other blocks in a group - All valid FS metadata in a block
435 * group stores the superblock fs_generation value at
436 * allocation time. */
437
438bail:
439 mlog_exit(status);
440 return status;
441}
442
443static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
444{
445 u16 curr, best;
446
447 best = curr = 0;
448 while (curr < le16_to_cpu(cl->cl_count)) {
449 if (le32_to_cpu(cl->cl_recs[best].c_total) >
450 le32_to_cpu(cl->cl_recs[curr].c_total))
451 best = curr;
452 curr++;
453 }
454 return best;
455}
456
Joel Becker798db352010-04-13 14:26:32 +0800457static struct buffer_head *
458ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
459 struct inode *alloc_inode,
460 struct ocfs2_alloc_context *ac,
461 struct ocfs2_chain_list *cl)
462{
463 int status;
464 u32 bit_off, num_bits;
465 u64 bg_blkno;
466 struct buffer_head *bg_bh;
467 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
468
Joel Becker1ed9b772010-05-06 13:59:06 +0800469 status = ocfs2_claim_clusters(handle, ac,
Joel Becker798db352010-04-13 14:26:32 +0800470 le16_to_cpu(cl->cl_cpg), &bit_off,
471 &num_bits);
472 if (status < 0) {
473 if (status != -ENOSPC)
474 mlog_errno(status);
475 goto bail;
476 }
477
478 /* setup the group */
479 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
480 mlog(0, "new descriptor, record %u, at block %llu\n",
481 alloc_rec, (unsigned long long)bg_blkno);
482
483 bg_bh = sb_getblk(osb->sb, bg_blkno);
484 if (!bg_bh) {
485 status = -EIO;
486 mlog_errno(status);
487 goto bail;
488 }
489 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
490
491 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
492 bg_blkno, num_bits, alloc_rec, cl);
493 if (status < 0) {
494 brelse(bg_bh);
495 mlog_errno(status);
496 }
497
498bail:
499 return status ? ERR_PTR(status) : bg_bh;
500}
501
502static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
503 handle_t *handle,
504 struct ocfs2_alloc_context *ac,
505 unsigned int min_bits,
506 u32 *bit_off, u32 *num_bits)
507{
Joel Becker18d3a982010-05-18 16:47:55 -0700508 int status = 0;
Joel Becker798db352010-04-13 14:26:32 +0800509
510 while (min_bits) {
Joel Becker1ed9b772010-05-06 13:59:06 +0800511 status = ocfs2_claim_clusters(handle, ac, min_bits,
Joel Becker798db352010-04-13 14:26:32 +0800512 bit_off, num_bits);
513 if (status != -ENOSPC)
514 break;
515
516 min_bits >>= 1;
517 }
518
519 return status;
520}
521
522static int ocfs2_block_group_grow_discontig(handle_t *handle,
523 struct inode *alloc_inode,
524 struct buffer_head *bg_bh,
525 struct ocfs2_alloc_context *ac,
526 struct ocfs2_chain_list *cl,
527 unsigned int min_bits)
528{
529 int status;
530 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
531 struct ocfs2_group_desc *bg =
532 (struct ocfs2_group_desc *)bg_bh->b_data;
Tao Ma47119542010-04-22 14:09:15 +0800533 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
534 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
Joel Becker798db352010-04-13 14:26:32 +0800535 u32 p_cpos, clusters;
536 u64 p_blkno;
537 struct ocfs2_extent_list *el = &bg->bg_list;
538
539 status = ocfs2_journal_access_gd(handle,
540 INODE_CACHE(alloc_inode),
541 bg_bh,
542 OCFS2_JOURNAL_ACCESS_CREATE);
543 if (status < 0) {
544 mlog_errno(status);
545 goto bail;
546 }
547
548 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
549 le16_to_cpu(el->l_count))) {
Joel Becker798db352010-04-13 14:26:32 +0800550 if (min_bits > needed)
551 min_bits = needed;
552 status = ocfs2_block_group_claim_bits(osb, handle, ac,
553 min_bits, &p_cpos,
554 &clusters);
555 if (status < 0) {
556 if (status != -ENOSPC)
557 mlog_errno(status);
558 goto bail;
559 }
560 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
561 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
562 clusters);
563
564 min_bits = clusters;
Tao Ma47119542010-04-22 14:09:15 +0800565 needed = le16_to_cpu(cl->cl_cpg) -
566 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
Joel Becker798db352010-04-13 14:26:32 +0800567 }
568
569 if (needed > 0) {
Tao Ma47119542010-04-22 14:09:15 +0800570 /*
571 * We have used up all the extent rec but can't fill up
572 * the cpg. So bail out.
573 */
574 status = -ENOSPC;
575 goto bail;
Joel Becker798db352010-04-13 14:26:32 +0800576 }
577
578 ocfs2_journal_dirty(handle, bg_bh);
579
580bail:
581 return status;
582}
583
Joel Becker8b06bc52010-03-26 10:09:29 +0800584static void ocfs2_bg_alloc_cleanup(handle_t *handle,
585 struct ocfs2_alloc_context *cluster_ac,
586 struct inode *alloc_inode,
587 struct buffer_head *bg_bh)
Joel Becker798db352010-04-13 14:26:32 +0800588{
Joel Becker8b06bc52010-03-26 10:09:29 +0800589 int i, ret;
Joel Becker798db352010-04-13 14:26:32 +0800590 struct ocfs2_group_desc *bg;
591 struct ocfs2_extent_list *el;
592 struct ocfs2_extent_rec *rec;
593
594 if (!bg_bh)
595 return;
596
597 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
598 el = &bg->bg_list;
599 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
600 rec = &el->l_recs[i];
Joel Becker8b06bc52010-03-26 10:09:29 +0800601 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
602 cluster_ac->ac_bh,
603 le64_to_cpu(rec->e_blkno),
604 le32_to_cpu(rec->e_leaf_clusters));
605 if (ret)
606 mlog_errno(ret);
607 /* Try all the clusters to free */
Joel Becker798db352010-04-13 14:26:32 +0800608 }
609
610 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
611 brelse(bg_bh);
612}
613
614static struct buffer_head *
615ocfs2_block_group_alloc_discontig(handle_t *handle,
616 struct inode *alloc_inode,
617 struct ocfs2_alloc_context *ac,
Joel Becker8b06bc52010-03-26 10:09:29 +0800618 struct ocfs2_chain_list *cl)
Joel Becker798db352010-04-13 14:26:32 +0800619{
620 int status;
621 u32 bit_off, num_bits;
622 u64 bg_blkno;
623 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
624 struct buffer_head *bg_bh = NULL;
625 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
626 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
627
Tao Ma47119542010-04-22 14:09:15 +0800628 if (!ocfs2_supports_discontig_bg(osb)) {
Joel Becker798db352010-04-13 14:26:32 +0800629 status = -ENOSPC;
630 goto bail;
631 }
632
Joel Becker8b06bc52010-03-26 10:09:29 +0800633 status = ocfs2_extend_trans(handle,
634 ocfs2_calc_bg_discontig_credits(osb->sb));
635 if (status) {
636 mlog_errno(status);
637 goto bail;
638 }
639
Joel Becker95ec0ad2010-03-26 10:10:08 +0800640 /*
641 * We're going to be grabbing from multiple cluster groups.
642 * We don't have enough credits to relink them all, and the
643 * cluster groups will be staying in cache for the duration of
644 * this operation.
645 */
646 ac->ac_allow_chain_relink = 0;
647
Joel Becker798db352010-04-13 14:26:32 +0800648 /* Claim the first region */
649 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
650 &bit_off, &num_bits);
651 if (status < 0) {
652 if (status != -ENOSPC)
653 mlog_errno(status);
654 goto bail;
655 }
656 min_bits = num_bits;
657
658 /* setup the group */
659 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
660 mlog(0, "new descriptor, record %u, at block %llu\n",
661 alloc_rec, (unsigned long long)bg_blkno);
662
663 bg_bh = sb_getblk(osb->sb, bg_blkno);
664 if (!bg_bh) {
665 status = -EIO;
666 mlog_errno(status);
667 goto bail;
668 }
669 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
670
671 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
672 bg_blkno, num_bits, alloc_rec, cl);
673 if (status < 0) {
674 mlog_errno(status);
675 goto bail;
676 }
677
678 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
679 bg_bh, ac, cl, min_bits);
680 if (status)
681 mlog_errno(status);
682
683bail:
684 if (status)
Joel Becker8b06bc52010-03-26 10:09:29 +0800685 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
Joel Becker798db352010-04-13 14:26:32 +0800686 return status ? ERR_PTR(status) : bg_bh;
687}
688
Mark Fashehccd979b2005-12-15 14:31:24 -0800689/*
690 * We expect the block group allocator to already be locked.
691 */
692static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
693 struct inode *alloc_inode,
Joel Becker1187c962008-09-03 20:03:39 -0700694 struct buffer_head *bh,
Tao Ma60ca81e2009-02-25 00:53:24 +0800695 u64 max_block,
Tao Mafeb473a2009-02-25 00:53:25 +0800696 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +0800697 int flags)
Mark Fashehccd979b2005-12-15 14:31:24 -0800698{
699 int status, credits;
700 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
701 struct ocfs2_chain_list *cl;
702 struct ocfs2_alloc_context *ac = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700703 handle_t *handle = NULL;
Tao Ma47119542010-04-22 14:09:15 +0800704 u16 alloc_rec;
Mark Fashehccd979b2005-12-15 14:31:24 -0800705 struct buffer_head *bg_bh = NULL;
706 struct ocfs2_group_desc *bg;
707
708 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
709
710 mlog_entry_void();
711
Mark Fashehccd979b2005-12-15 14:31:24 -0800712 cl = &fe->id2.i_chain;
Joel Becker1187c962008-09-03 20:03:39 -0700713 status = ocfs2_reserve_clusters_with_limit(osb,
714 le16_to_cpu(cl->cl_cpg),
Tao Ma60ca81e2009-02-25 00:53:24 +0800715 max_block, flags, &ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800716 if (status < 0) {
717 if (status != -ENOSPC)
718 mlog_errno(status);
719 goto bail;
720 }
721
722 credits = ocfs2_calc_group_alloc_credits(osb->sb,
723 le16_to_cpu(cl->cl_cpg));
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700724 handle = ocfs2_start_trans(osb, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800725 if (IS_ERR(handle)) {
726 status = PTR_ERR(handle);
727 handle = NULL;
728 mlog_errno(status);
729 goto bail;
730 }
731
Tao Mafeb473a2009-02-25 00:53:25 +0800732 if (last_alloc_group && *last_alloc_group != 0) {
733 mlog(0, "use old allocation group %llu for block group alloc\n",
734 (unsigned long long)*last_alloc_group);
735 ac->ac_last_group = *last_alloc_group;
736 }
Joel Becker798db352010-04-13 14:26:32 +0800737
738 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
739 ac, cl);
740 if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
741 bg_bh = ocfs2_block_group_alloc_discontig(handle,
742 alloc_inode,
Joel Becker8b06bc52010-03-26 10:09:29 +0800743 ac, cl);
Joel Becker798db352010-04-13 14:26:32 +0800744 if (IS_ERR(bg_bh)) {
745 status = PTR_ERR(bg_bh);
746 bg_bh = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800747 if (status != -ENOSPC)
748 mlog_errno(status);
749 goto bail;
750 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800751 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
752
Joel Becker0cf2f762009-02-12 16:41:25 -0800753 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -0700754 bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800755 if (status < 0) {
756 mlog_errno(status);
757 goto bail;
758 }
759
Tao Ma47119542010-04-22 14:09:15 +0800760 alloc_rec = le16_to_cpu(bg->bg_chain);
761 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
Mark Fashehccd979b2005-12-15 14:31:24 -0800762 le16_to_cpu(bg->bg_free_bits_count));
Tao Ma47119542010-04-22 14:09:15 +0800763 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
Joel Becker798db352010-04-13 14:26:32 +0800764 le16_to_cpu(bg->bg_bits));
Tao Ma0a463b72010-07-08 11:11:11 +0800765 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -0800766 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
767 le16_add_cpu(&cl->cl_next_free_rec, 1);
768
769 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
770 le16_to_cpu(bg->bg_free_bits_count));
771 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
772 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
773
Joel Beckerec20cec2010-03-19 14:13:52 -0700774 ocfs2_journal_dirty(handle, bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800775
776 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
777 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
778 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
779 le32_to_cpu(fe->i_clusters)));
780 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
781 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
Mark Fasheh8110b072007-03-22 16:53:23 -0700782 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800783
784 status = 0;
Tao Mafeb473a2009-02-25 00:53:25 +0800785
786 /* save the new last alloc group so that the caller can cache it. */
787 if (last_alloc_group)
788 *last_alloc_group = ac->ac_last_group;
789
Mark Fashehccd979b2005-12-15 14:31:24 -0800790bail:
791 if (handle)
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700792 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800793
794 if (ac)
795 ocfs2_free_alloc_context(ac);
796
Mark Fasheha81cb882008-10-07 14:25:16 -0700797 brelse(bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800798
799 mlog_exit(status);
800 return status;
801}
802
803static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
Mark Fashehda5cbf22006-10-06 18:34:35 -0700804 struct ocfs2_alloc_context *ac,
805 int type,
Tao Maffda89a2008-03-03 17:12:09 +0800806 u32 slot,
Tao Mafeb473a2009-02-25 00:53:25 +0800807 u64 *last_alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +0800808 int flags)
Mark Fashehccd979b2005-12-15 14:31:24 -0800809{
810 int status;
811 u32 bits_wanted = ac->ac_bits_wanted;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700812 struct inode *alloc_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800813 struct buffer_head *bh = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800814 struct ocfs2_dinode *fe;
815 u32 free_bits;
816
817 mlog_entry_void();
818
Mark Fashehda5cbf22006-10-06 18:34:35 -0700819 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
820 if (!alloc_inode) {
821 mlog_errno(-EINVAL);
822 return -EINVAL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800823 }
824
Mark Fashehda5cbf22006-10-06 18:34:35 -0700825 mutex_lock(&alloc_inode->i_mutex);
826
Mark Fashehe63aecb62007-10-18 15:30:42 -0700827 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
Mark Fashehda5cbf22006-10-06 18:34:35 -0700828 if (status < 0) {
829 mutex_unlock(&alloc_inode->i_mutex);
830 iput(alloc_inode);
831
832 mlog_errno(status);
833 return status;
834 }
835
836 ac->ac_inode = alloc_inode;
Tao Maa4a48912008-03-03 17:12:30 +0800837 ac->ac_alloc_slot = slot;
Mark Fashehda5cbf22006-10-06 18:34:35 -0700838
Mark Fashehccd979b2005-12-15 14:31:24 -0800839 fe = (struct ocfs2_dinode *) bh->b_data;
Joel Becker10995aa2008-11-13 14:49:12 -0800840
841 /* The bh was validated by the inode read inside
842 * ocfs2_inode_lock(). Any corruption is a code bug. */
843 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
844
Mark Fashehccd979b2005-12-15 14:31:24 -0800845 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
Mark Fashehb0697052006-03-03 10:24:33 -0800846 ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator %llu",
847 (unsigned long long)le64_to_cpu(fe->i_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -0800848 status = -EIO;
849 goto bail;
850 }
851
852 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
853 le32_to_cpu(fe->id1.bitmap1.i_used);
854
855 if (bits_wanted > free_bits) {
856 /* cluster bitmap never grows */
857 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
858 mlog(0, "Disk Full: wanted=%u, free_bits=%u\n",
859 bits_wanted, free_bits);
860 status = -ENOSPC;
861 goto bail;
862 }
863
Tao Ma60ca81e2009-02-25 00:53:24 +0800864 if (!(flags & ALLOC_NEW_GROUP)) {
Tao Maffda89a2008-03-03 17:12:09 +0800865 mlog(0, "Alloc File %u Full: wanted=%u, free_bits=%u, "
866 "and we don't alloc a new group for it.\n",
867 slot, bits_wanted, free_bits);
868 status = -ENOSPC;
869 goto bail;
870 }
871
Joel Becker1187c962008-09-03 20:03:39 -0700872 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
Tao Mafeb473a2009-02-25 00:53:25 +0800873 ac->ac_max_block,
874 last_alloc_group, flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800875 if (status < 0) {
876 if (status != -ENOSPC)
877 mlog_errno(status);
878 goto bail;
879 }
880 atomic_inc(&osb->alloc_stats.bg_extends);
881
882 /* You should never ask for this much metadata */
883 BUG_ON(bits_wanted >
884 (le32_to_cpu(fe->id1.bitmap1.i_total)
885 - le32_to_cpu(fe->id1.bitmap1.i_used)));
886 }
887
888 get_bh(bh);
889 ac->ac_bh = bh;
890bail:
Mark Fasheha81cb882008-10-07 14:25:16 -0700891 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800892
893 mlog_exit(status);
894 return status;
895}
896
Tiger Yangb89c5422010-01-25 14:11:06 +0800897static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
898{
899 spin_lock(&osb->osb_lock);
900 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
901 spin_unlock(&osb->osb_lock);
902 atomic_set(&osb->s_num_inodes_stolen, 0);
903}
904
905static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
906{
907 spin_lock(&osb->osb_lock);
908 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
909 spin_unlock(&osb->osb_lock);
910 atomic_set(&osb->s_num_meta_stolen, 0);
911}
912
913void ocfs2_init_steal_slots(struct ocfs2_super *osb)
914{
915 ocfs2_init_inode_steal_slot(osb);
916 ocfs2_init_meta_steal_slot(osb);
917}
918
919static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
920{
921 spin_lock(&osb->osb_lock);
922 if (type == INODE_ALLOC_SYSTEM_INODE)
923 osb->s_inode_steal_slot = slot;
924 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
925 osb->s_meta_steal_slot = slot;
926 spin_unlock(&osb->osb_lock);
927}
928
929static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
930{
931 int slot = OCFS2_INVALID_SLOT;
932
933 spin_lock(&osb->osb_lock);
934 if (type == INODE_ALLOC_SYSTEM_INODE)
935 slot = osb->s_inode_steal_slot;
936 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
937 slot = osb->s_meta_steal_slot;
938 spin_unlock(&osb->osb_lock);
939
940 return slot;
941}
942
943static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
944{
945 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
946}
947
948static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
949{
950 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
951}
952
953static int ocfs2_steal_resource(struct ocfs2_super *osb,
954 struct ocfs2_alloc_context *ac,
955 int type)
956{
957 int i, status = -ENOSPC;
958 int slot = __ocfs2_get_steal_slot(osb, type);
959
960 /* Start to steal resource from the first slot after ours. */
961 if (slot == OCFS2_INVALID_SLOT)
962 slot = osb->slot_num + 1;
963
964 for (i = 0; i < osb->max_slots; i++, slot++) {
965 if (slot == osb->max_slots)
966 slot = 0;
967
968 if (slot == osb->slot_num)
969 continue;
970
971 status = ocfs2_reserve_suballoc_bits(osb, ac,
972 type,
973 (u32)slot, NULL,
974 NOT_ALLOC_NEW_GROUP);
975 if (status >= 0) {
976 __ocfs2_set_steal_slot(osb, slot, type);
977 break;
978 }
979
980 ocfs2_free_ac_resource(ac);
981 }
982
983 return status;
984}
985
986static int ocfs2_steal_inode(struct ocfs2_super *osb,
987 struct ocfs2_alloc_context *ac)
988{
989 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
990}
991
992static int ocfs2_steal_meta(struct ocfs2_super *osb,
993 struct ocfs2_alloc_context *ac)
994{
995 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
996}
997
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800998int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
999 int blocks,
1000 struct ocfs2_alloc_context **ac)
Mark Fashehccd979b2005-12-15 14:31:24 -08001001{
1002 int status;
Tiger Yangb89c5422010-01-25 14:11:06 +08001003 int slot = ocfs2_get_meta_steal_slot(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -08001004
Robert P. J. Daycd861282006-12-13 00:34:52 -08001005 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001006 if (!(*ac)) {
1007 status = -ENOMEM;
1008 mlog_errno(status);
1009 goto bail;
1010 }
1011
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001012 (*ac)->ac_bits_wanted = blocks;
Mark Fashehccd979b2005-12-15 14:31:24 -08001013 (*ac)->ac_which = OCFS2_AC_USE_META;
Mark Fashehccd979b2005-12-15 14:31:24 -08001014 (*ac)->ac_group_search = ocfs2_block_group_search;
1015
Tiger Yangb89c5422010-01-25 14:11:06 +08001016 if (slot != OCFS2_INVALID_SLOT &&
1017 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
1018 goto extent_steal;
1019
1020 atomic_set(&osb->s_num_meta_stolen, 0);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001021 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
Tao Maffda89a2008-03-03 17:12:09 +08001022 EXTENT_ALLOC_SYSTEM_INODE,
Tiger Yangb89c5422010-01-25 14:11:06 +08001023 (u32)osb->slot_num, NULL,
Mark Fasheh33d5d382010-02-24 13:34:09 -08001024 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
Tiger Yangb89c5422010-01-25 14:11:06 +08001025
1026
1027 if (status >= 0) {
1028 status = 0;
1029 if (slot != OCFS2_INVALID_SLOT)
1030 ocfs2_init_meta_steal_slot(osb);
1031 goto bail;
1032 } else if (status < 0 && status != -ENOSPC) {
1033 mlog_errno(status);
1034 goto bail;
1035 }
1036
1037 ocfs2_free_ac_resource(*ac);
1038
1039extent_steal:
1040 status = ocfs2_steal_meta(osb, *ac);
1041 atomic_inc(&osb->s_num_meta_stolen);
Mark Fashehccd979b2005-12-15 14:31:24 -08001042 if (status < 0) {
1043 if (status != -ENOSPC)
1044 mlog_errno(status);
1045 goto bail;
1046 }
1047
1048 status = 0;
1049bail:
1050 if ((status < 0) && *ac) {
1051 ocfs2_free_alloc_context(*ac);
1052 *ac = NULL;
1053 }
1054
Mark Fashehccd979b2005-12-15 14:31:24 -08001055 mlog_exit(status);
1056 return status;
1057}
1058
Tiger Yangcf1d6c72008-08-18 17:11:00 +08001059int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1060 struct ocfs2_extent_list *root_el,
1061 struct ocfs2_alloc_context **ac)
1062{
1063 return ocfs2_reserve_new_metadata_blocks(osb,
1064 ocfs2_extend_meta_needed(root_el),
1065 ac);
1066}
1067
Mark Fashehccd979b2005-12-15 14:31:24 -08001068int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
Mark Fashehccd979b2005-12-15 14:31:24 -08001069 struct ocfs2_alloc_context **ac)
1070{
1071 int status;
Tiger Yangb89c5422010-01-25 14:11:06 +08001072 int slot = ocfs2_get_inode_steal_slot(osb);
Tao Mafeb473a2009-02-25 00:53:25 +08001073 u64 alloc_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001074
Robert P. J. Daycd861282006-12-13 00:34:52 -08001075 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001076 if (!(*ac)) {
1077 status = -ENOMEM;
1078 mlog_errno(status);
1079 goto bail;
1080 }
1081
1082 (*ac)->ac_bits_wanted = 1;
Mark Fashehccd979b2005-12-15 14:31:24 -08001083 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1084
Mark Fashehccd979b2005-12-15 14:31:24 -08001085 (*ac)->ac_group_search = ocfs2_block_group_search;
1086
Tao Ma4d0ddb22008-03-05 16:11:46 +08001087 /*
Joel Becker1187c962008-09-03 20:03:39 -07001088 * stat(2) can't handle i_ino > 32bits, so we tell the
1089 * lower levels not to allocate us a block group past that
Joel Becker12462f12008-09-03 20:03:40 -07001090 * limit. The 'inode64' mount option avoids this behavior.
Joel Becker1187c962008-09-03 20:03:39 -07001091 */
Joel Becker12462f12008-09-03 20:03:40 -07001092 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1093 (*ac)->ac_max_block = (u32)~0U;
Joel Becker1187c962008-09-03 20:03:39 -07001094
1095 /*
Tao Ma4d0ddb22008-03-05 16:11:46 +08001096 * slot is set when we successfully steal inode from other nodes.
1097 * It is reset in 3 places:
1098 * 1. when we flush the truncate log
1099 * 2. when we complete local alloc recovery.
1100 * 3. when we successfully allocate from our own slot.
1101 * After it is set, we will go on stealing inodes until we find the
1102 * need to check our slots to see whether there is some space for us.
1103 */
1104 if (slot != OCFS2_INVALID_SLOT &&
Tiger Yangb89c5422010-01-25 14:11:06 +08001105 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
Tao Ma4d0ddb22008-03-05 16:11:46 +08001106 goto inode_steal;
1107
1108 atomic_set(&osb->s_num_inodes_stolen, 0);
Tao Mafeb473a2009-02-25 00:53:25 +08001109 alloc_group = osb->osb_inode_alloc_group;
Mark Fashehda5cbf22006-10-06 18:34:35 -07001110 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1111 INODE_ALLOC_SYSTEM_INODE,
Tiger Yangb89c5422010-01-25 14:11:06 +08001112 (u32)osb->slot_num,
Tao Mafeb473a2009-02-25 00:53:25 +08001113 &alloc_group,
Tao Ma60ca81e2009-02-25 00:53:24 +08001114 ALLOC_NEW_GROUP |
1115 ALLOC_GROUPS_FROM_GLOBAL);
Tao Ma4d0ddb22008-03-05 16:11:46 +08001116 if (status >= 0) {
1117 status = 0;
1118
Tao Mafeb473a2009-02-25 00:53:25 +08001119 spin_lock(&osb->osb_lock);
1120 osb->osb_inode_alloc_group = alloc_group;
1121 spin_unlock(&osb->osb_lock);
1122 mlog(0, "after reservation, new allocation group is "
1123 "%llu\n", (unsigned long long)alloc_group);
1124
Tao Ma4d0ddb22008-03-05 16:11:46 +08001125 /*
1126 * Some inodes must be freed by us, so try to allocate
1127 * from our own next time.
1128 */
1129 if (slot != OCFS2_INVALID_SLOT)
1130 ocfs2_init_inode_steal_slot(osb);
1131 goto bail;
1132 } else if (status < 0 && status != -ENOSPC) {
1133 mlog_errno(status);
1134 goto bail;
1135 }
1136
1137 ocfs2_free_ac_resource(*ac);
1138
1139inode_steal:
Tiger Yangb89c5422010-01-25 14:11:06 +08001140 status = ocfs2_steal_inode(osb, *ac);
Tao Ma4d0ddb22008-03-05 16:11:46 +08001141 atomic_inc(&osb->s_num_inodes_stolen);
Mark Fashehccd979b2005-12-15 14:31:24 -08001142 if (status < 0) {
1143 if (status != -ENOSPC)
1144 mlog_errno(status);
1145 goto bail;
1146 }
1147
1148 status = 0;
1149bail:
1150 if ((status < 0) && *ac) {
1151 ocfs2_free_alloc_context(*ac);
1152 *ac = NULL;
1153 }
1154
Mark Fashehccd979b2005-12-15 14:31:24 -08001155 mlog_exit(status);
1156 return status;
1157}
1158
1159/* local alloc code has to do the same thing, so rather than do this
1160 * twice.. */
1161int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1162 struct ocfs2_alloc_context *ac)
1163{
1164 int status;
1165
Mark Fashehccd979b2005-12-15 14:31:24 -08001166 ac->ac_which = OCFS2_AC_USE_MAIN;
1167 ac->ac_group_search = ocfs2_cluster_group_search;
1168
Mark Fashehda5cbf22006-10-06 18:34:35 -07001169 status = ocfs2_reserve_suballoc_bits(osb, ac,
1170 GLOBAL_BITMAP_SYSTEM_INODE,
Tao Mafeb473a2009-02-25 00:53:25 +08001171 OCFS2_INVALID_SLOT, NULL,
Tao Maffda89a2008-03-03 17:12:09 +08001172 ALLOC_NEW_GROUP);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001173 if (status < 0 && status != -ENOSPC) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001174 mlog_errno(status);
Mark Fashehda5cbf22006-10-06 18:34:35 -07001175 goto bail;
1176 }
1177
Mark Fashehccd979b2005-12-15 14:31:24 -08001178bail:
1179 return status;
1180}
1181
1182/* Callers don't need to care which bitmap (local alloc or main) to
1183 * use so we figure it out for them, but unfortunately this clutters
1184 * things a bit. */
Joel Becker1187c962008-09-03 20:03:39 -07001185static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1186 u32 bits_wanted, u64 max_block,
Tao Ma60ca81e2009-02-25 00:53:24 +08001187 int flags,
Joel Becker1187c962008-09-03 20:03:39 -07001188 struct ocfs2_alloc_context **ac)
Mark Fashehccd979b2005-12-15 14:31:24 -08001189{
1190 int status;
1191
1192 mlog_entry_void();
1193
Robert P. J. Daycd861282006-12-13 00:34:52 -08001194 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -08001195 if (!(*ac)) {
1196 status = -ENOMEM;
1197 mlog_errno(status);
1198 goto bail;
1199 }
1200
1201 (*ac)->ac_bits_wanted = bits_wanted;
Joel Becker1187c962008-09-03 20:03:39 -07001202 (*ac)->ac_max_block = max_block;
Mark Fashehccd979b2005-12-15 14:31:24 -08001203
1204 status = -ENOSPC;
Tao Ma60ca81e2009-02-25 00:53:24 +08001205 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1206 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001207 status = ocfs2_reserve_local_alloc_bits(osb,
Mark Fashehccd979b2005-12-15 14:31:24 -08001208 bits_wanted,
1209 *ac);
Mark Fasheha57c8fd2010-03-16 21:01:00 -07001210 if ((status < 0) && (status != -ENOSPC)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001211 mlog_errno(status);
1212 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -08001213 }
1214 }
1215
1216 if (status == -ENOSPC) {
1217 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1218 if (status < 0) {
1219 if (status != -ENOSPC)
1220 mlog_errno(status);
1221 goto bail;
1222 }
1223 }
1224
1225 status = 0;
1226bail:
1227 if ((status < 0) && *ac) {
1228 ocfs2_free_alloc_context(*ac);
1229 *ac = NULL;
1230 }
1231
1232 mlog_exit(status);
1233 return status;
1234}
1235
Joel Becker1187c962008-09-03 20:03:39 -07001236int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1237 u32 bits_wanted,
1238 struct ocfs2_alloc_context **ac)
1239{
Tao Ma60ca81e2009-02-25 00:53:24 +08001240 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1241 ALLOC_NEW_GROUP, ac);
Joel Becker1187c962008-09-03 20:03:39 -07001242}
1243
Mark Fashehccd979b2005-12-15 14:31:24 -08001244/*
1245 * More or less lifted from ext3. I'll leave their description below:
1246 *
1247 * "For ext3 allocations, we must not reuse any blocks which are
1248 * allocated in the bitmap buffer's "last committed data" copy. This
1249 * prevents deletes from freeing up the page for reuse until we have
1250 * committed the delete transaction.
1251 *
1252 * If we didn't do this, then deleting something and reallocating it as
1253 * data would allow the old block to be overwritten before the
1254 * transaction committed (because we force data to disk before commit).
1255 * This would lead to corruption if we crashed between overwriting the
1256 * data and committing the delete.
1257 *
1258 * @@@ We may want to make this allocation behaviour conditional on
1259 * data-writes at some point, and disable it for metadata allocations or
1260 * sync-data inodes."
1261 *
1262 * Note: OCFS2 already does this differently for metadata vs data
Joe Perchesc78bad12008-02-03 17:33:42 +02001263 * allocations, as those bitmaps are separate and undo access is never
Mark Fashehccd979b2005-12-15 14:31:24 -08001264 * called on a metadata group descriptor.
1265 */
1266static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1267 int nr)
1268{
1269 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001270 int ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08001271
1272 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1273 return 0;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001274
1275 if (!buffer_jbd(bg_bh))
Mark Fashehccd979b2005-12-15 14:31:24 -08001276 return 1;
1277
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001278 jbd_lock_bh_state(bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001279 bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
Sunil Mushran94e41ec2009-06-19 14:45:54 -07001280 if (bg)
1281 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1282 else
1283 ret = 1;
1284 jbd_unlock_bh_state(bg_bh);
1285
1286 return ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08001287}
1288
1289static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1290 struct buffer_head *bg_bh,
1291 unsigned int bits_wanted,
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001292 unsigned int total_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001293 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001294{
1295 void *bitmap;
1296 u16 best_offset, best_size;
1297 int offset, start, found, status = 0;
1298 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1299
Joel Becker42035302008-11-13 14:49:15 -08001300 /* Callers got this descriptor from
1301 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1302 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001303
1304 found = start = best_offset = best_size = 0;
1305 bitmap = bg->bg_bitmap;
1306
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001307 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1308 if (offset == total_bits)
Mark Fashehccd979b2005-12-15 14:31:24 -08001309 break;
1310
1311 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1312 /* We found a zero, but we can't use it as it
1313 * hasn't been put to disk yet! */
1314 found = 0;
1315 start = offset + 1;
1316 } else if (offset == start) {
1317 /* we found a zero */
1318 found++;
1319 /* move start to the next bit to test */
1320 start++;
1321 } else {
1322 /* got a zero after some ones */
1323 found = 1;
1324 start = offset + 1;
1325 }
1326 if (found > best_size) {
1327 best_size = found;
1328 best_offset = start - found;
1329 }
1330 /* we got everything we needed */
1331 if (found == bits_wanted) {
1332 /* mlog(0, "Found it all!\n"); */
1333 break;
1334 }
1335 }
1336
Joel Becker7d1fe092010-04-13 14:30:19 +08001337 if (best_size) {
1338 res->sr_bit_offset = best_offset;
1339 res->sr_bits = best_size;
Mark Fashehccd979b2005-12-15 14:31:24 -08001340 } else {
1341 status = -ENOSPC;
1342 /* No error log here -- see the comment above
1343 * ocfs2_test_bg_bit_allocatable */
1344 }
1345
1346 return status;
1347}
1348
Mark Fasheh1fabe142006-10-09 18:11:45 -07001349static inline int ocfs2_block_group_set_bits(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001350 struct inode *alloc_inode,
1351 struct ocfs2_group_desc *bg,
1352 struct buffer_head *group_bh,
1353 unsigned int bit_off,
1354 unsigned int num_bits)
1355{
1356 int status;
1357 void *bitmap = bg->bg_bitmap;
1358 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1359
1360 mlog_entry_void();
1361
Joel Becker42035302008-11-13 14:49:15 -08001362 /* All callers get the descriptor via
1363 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1364 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001365 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1366
1367 mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,
1368 num_bits);
1369
1370 if (ocfs2_is_cluster_bitmap(alloc_inode))
1371 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1372
Joel Becker13723d02008-10-17 19:25:01 -07001373 status = ocfs2_journal_access_gd(handle,
Joel Becker0cf2f762009-02-12 16:41:25 -08001374 INODE_CACHE(alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -07001375 group_bh,
1376 journal_type);
Mark Fashehccd979b2005-12-15 14:31:24 -08001377 if (status < 0) {
1378 mlog_errno(status);
1379 goto bail;
1380 }
1381
1382 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
Srinivas Eeda9b5cd102010-10-05 15:53:06 -07001383 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1384 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
1385 " count %u but claims %u are freed. num_bits %d",
1386 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1387 le16_to_cpu(bg->bg_bits),
1388 le16_to_cpu(bg->bg_free_bits_count), num_bits);
1389 return -EROFS;
1390 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001391 while(num_bits--)
1392 ocfs2_set_bit(bit_off++, bitmap);
1393
Joel Beckerec20cec2010-03-19 14:13:52 -07001394 ocfs2_journal_dirty(handle, group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001395
1396bail:
1397 mlog_exit(status);
1398 return status;
1399}
1400
1401/* find the one with the most empty bits */
1402static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1403{
1404 u16 curr, best;
1405
1406 BUG_ON(!cl->cl_next_free_rec);
1407
1408 best = curr = 0;
1409 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1410 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1411 le32_to_cpu(cl->cl_recs[best].c_free))
1412 best = curr;
1413 curr++;
1414 }
1415
1416 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1417 return best;
1418}
1419
Mark Fasheh1fabe142006-10-09 18:11:45 -07001420static int ocfs2_relink_block_group(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001421 struct inode *alloc_inode,
1422 struct buffer_head *fe_bh,
1423 struct buffer_head *bg_bh,
1424 struct buffer_head *prev_bg_bh,
1425 u16 chain)
1426{
1427 int status;
1428 /* there is a really tiny chance the journal calls could fail,
1429 * but we wouldn't want inconsistent blocks in *any* case. */
1430 u64 fe_ptr, bg_ptr, prev_bg_ptr;
1431 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1432 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1433 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1434
Joel Becker42035302008-11-13 14:49:15 -08001435 /* The caller got these descriptors from
1436 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1437 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1438 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08001439
Mark Fashehb0697052006-03-03 10:24:33 -08001440 mlog(0, "Suballoc %llu, chain %u, move group %llu to top, prev = %llu\n",
Mark Fasheh1ca1a112007-04-27 16:01:25 -07001441 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1442 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1443 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -08001444
1445 fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno);
1446 bg_ptr = le64_to_cpu(bg->bg_next_group);
1447 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1448
Joel Becker0cf2f762009-02-12 16:41:25 -08001449 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1450 prev_bg_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001451 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001452 if (status < 0) {
1453 mlog_errno(status);
1454 goto out_rollback;
1455 }
1456
1457 prev_bg->bg_next_group = bg->bg_next_group;
Joel Beckerec20cec2010-03-19 14:13:52 -07001458 ocfs2_journal_dirty(handle, prev_bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001459
Joel Becker0cf2f762009-02-12 16:41:25 -08001460 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1461 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001462 if (status < 0) {
1463 mlog_errno(status);
1464 goto out_rollback;
1465 }
1466
1467 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
Joel Beckerec20cec2010-03-19 14:13:52 -07001468 ocfs2_journal_dirty(handle, bg_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001469
Joel Becker0cf2f762009-02-12 16:41:25 -08001470 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1471 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001472 if (status < 0) {
1473 mlog_errno(status);
1474 goto out_rollback;
1475 }
1476
1477 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
Joel Beckerec20cec2010-03-19 14:13:52 -07001478 ocfs2_journal_dirty(handle, fe_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001479
Mark Fashehccd979b2005-12-15 14:31:24 -08001480out_rollback:
1481 if (status < 0) {
1482 fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr);
1483 bg->bg_next_group = cpu_to_le64(bg_ptr);
1484 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1485 }
Joel Becker42035302008-11-13 14:49:15 -08001486
Mark Fashehccd979b2005-12-15 14:31:24 -08001487 mlog_exit(status);
1488 return status;
1489}
1490
1491static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1492 u32 wanted)
1493{
1494 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1495}
1496
1497/* return 0 on success, -ENOSPC to keep searching and any other < 0
1498 * value on error. */
1499static int ocfs2_cluster_group_search(struct inode *inode,
1500 struct buffer_head *group_bh,
1501 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -07001502 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +08001503 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001504{
1505 int search = -ENOSPC;
1506 int ret;
Joel Becker1187c962008-09-03 20:03:39 -07001507 u64 blkoff;
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001508 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fasheh9c7af402008-07-28 18:02:53 -07001509 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001510 unsigned int max_bits, gd_cluster_off;
Mark Fashehccd979b2005-12-15 14:31:24 -08001511
1512 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1513
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001514 if (gd->bg_free_bits_count) {
1515 max_bits = le16_to_cpu(gd->bg_bits);
1516
1517 /* Tail groups in cluster bitmaps which aren't cpg
1518 * aligned are prone to partial extention by a failed
1519 * fs resize. If the file system resize never got to
1520 * update the dinode cluster count, then we don't want
1521 * to trust any clusters past it, regardless of what
1522 * the group descriptor says. */
1523 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1524 le64_to_cpu(gd->bg_blkno));
1525 if ((gd_cluster_off + max_bits) >
1526 OCFS2_I(inode)->ip_clusters) {
1527 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1528 mlog(0, "Desc %llu, bg_bits %u, clusters %u, use %u\n",
1529 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1530 le16_to_cpu(gd->bg_bits),
1531 OCFS2_I(inode)->ip_clusters, max_bits);
1532 }
1533
Mark Fashehccd979b2005-12-15 14:31:24 -08001534 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1535 group_bh, bits_wanted,
Joel Becker7d1fe092010-04-13 14:30:19 +08001536 max_bits, res);
Mark Fashehccd979b2005-12-15 14:31:24 -08001537 if (ret)
1538 return ret;
1539
Joel Becker1187c962008-09-03 20:03:39 -07001540 if (max_block) {
1541 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1542 gd_cluster_off +
Joel Becker7d1fe092010-04-13 14:30:19 +08001543 res->sr_bit_offset +
1544 res->sr_bits);
Joel Becker1187c962008-09-03 20:03:39 -07001545 mlog(0, "Checking %llu against %llu\n",
1546 (unsigned long long)blkoff,
1547 (unsigned long long)max_block);
1548 if (blkoff > max_block)
1549 return -ENOSPC;
1550 }
1551
Mark Fashehccd979b2005-12-15 14:31:24 -08001552 /* ocfs2_block_group_find_clear_bits() might
1553 * return success, but we still want to return
1554 * -ENOSPC unless it found the minimum number
1555 * of bits. */
Joel Becker7d1fe092010-04-13 14:30:19 +08001556 if (min_bits <= res->sr_bits)
Mark Fashehccd979b2005-12-15 14:31:24 -08001557 search = 0; /* success */
Joel Becker7d1fe092010-04-13 14:30:19 +08001558 else if (res->sr_bits) {
Mark Fasheh9c7af402008-07-28 18:02:53 -07001559 /*
1560 * Don't show bits which we'll be returning
1561 * for allocation to the local alloc bitmap.
1562 */
Joel Becker7d1fe092010-04-13 14:30:19 +08001563 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001564 }
1565 }
1566
1567 return search;
1568}
1569
1570static int ocfs2_block_group_search(struct inode *inode,
1571 struct buffer_head *group_bh,
1572 u32 bits_wanted, u32 min_bits,
Joel Becker1187c962008-09-03 20:03:39 -07001573 u64 max_block,
Joel Becker7d1fe092010-04-13 14:30:19 +08001574 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001575{
1576 int ret = -ENOSPC;
Joel Becker1187c962008-09-03 20:03:39 -07001577 u64 blkoff;
Mark Fashehccd979b2005-12-15 14:31:24 -08001578 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1579
1580 BUG_ON(min_bits != 1);
1581 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1582
Joel Becker1187c962008-09-03 20:03:39 -07001583 if (bg->bg_free_bits_count) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001584 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1585 group_bh, bits_wanted,
Mark Fasheh7bf72ed2006-05-03 17:46:50 -07001586 le16_to_cpu(bg->bg_bits),
Joel Becker7d1fe092010-04-13 14:30:19 +08001587 res);
Joel Becker1187c962008-09-03 20:03:39 -07001588 if (!ret && max_block) {
Joel Becker7d1fe092010-04-13 14:30:19 +08001589 blkoff = le64_to_cpu(bg->bg_blkno) +
1590 res->sr_bit_offset + res->sr_bits;
Joel Becker1187c962008-09-03 20:03:39 -07001591 mlog(0, "Checking %llu against %llu\n",
1592 (unsigned long long)blkoff,
1593 (unsigned long long)max_block);
1594 if (blkoff > max_block)
1595 ret = -ENOSPC;
1596 }
1597 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001598
1599 return ret;
1600}
1601
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001602static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001603 handle_t *handle,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001604 struct buffer_head *di_bh,
1605 u32 num_bits,
1606 u16 chain)
1607{
1608 int ret;
1609 u32 tmp_used;
1610 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1611 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1612
Joel Becker0cf2f762009-02-12 16:41:25 -08001613 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001614 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001615 if (ret < 0) {
1616 mlog_errno(ret);
1617 goto out;
1618 }
1619
1620 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1621 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1622 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
Joel Beckerec20cec2010-03-19 14:13:52 -07001623 ocfs2_journal_dirty(handle, di_bh);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001624
1625out:
1626 return ret;
1627}
1628
Joel Beckerba206632010-03-26 10:08:59 +08001629static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1630 struct ocfs2_extent_rec *rec,
1631 struct ocfs2_chain_list *cl)
Joel Becker13e434c2010-03-26 10:08:27 +08001632{
1633 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1634 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1635 unsigned int bitcount = le32_to_cpu(rec->e_leaf_clusters) * bpc;
1636
1637 if (res->sr_bit_offset < bitoff)
1638 return 0;
1639 if (res->sr_bit_offset >= (bitoff + bitcount))
1640 return 0;
Joel Beckerba206632010-03-26 10:08:59 +08001641 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1642 (res->sr_bit_offset - bitoff);
Joel Becker13e434c2010-03-26 10:08:27 +08001643 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1644 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1645 return 1;
1646}
1647
Joel Beckerba206632010-03-26 10:08:59 +08001648static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1649 struct ocfs2_group_desc *bg,
1650 struct ocfs2_suballoc_result *res)
Joel Becker13e434c2010-03-26 10:08:27 +08001651{
1652 int i;
Joel Becker2b6cb572010-03-26 10:09:15 +08001653 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
Joel Becker13e434c2010-03-26 10:08:27 +08001654 struct ocfs2_extent_rec *rec;
1655 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1656 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1657
Joel Beckerba206632010-03-26 10:08:59 +08001658 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1659 res->sr_blkno = 0;
Joel Becker13e434c2010-03-26 10:08:27 +08001660 return;
Joel Beckerba206632010-03-26 10:08:59 +08001661 }
Joel Becker13e434c2010-03-26 10:08:27 +08001662
Joel Beckerba206632010-03-26 10:08:59 +08001663 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
Joel Becker2b6cb572010-03-26 10:09:15 +08001664 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
Tao Ma47119542010-04-22 14:09:15 +08001665 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
Joel Beckerba206632010-03-26 10:08:59 +08001666 !bg->bg_list.l_next_free_rec)
Joel Becker13e434c2010-03-26 10:08:27 +08001667 return;
1668
1669 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1670 rec = &bg->bg_list.l_recs[i];
Joel Becker2b6cb572010-03-26 10:09:15 +08001671 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1672 res->sr_bg_blkno = bg_blkno; /* Restore */
Joel Becker13e434c2010-03-26 10:08:27 +08001673 break;
Joel Becker2b6cb572010-03-26 10:09:15 +08001674 }
Joel Becker13e434c2010-03-26 10:08:27 +08001675 }
1676}
1677
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001678static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001679 handle_t *handle,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001680 u32 bits_wanted,
1681 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001682 struct ocfs2_suballoc_result *res,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001683 u16 *bits_left)
1684{
1685 int ret;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001686 struct buffer_head *group_bh = NULL;
1687 struct ocfs2_group_desc *gd;
Joel Becker68f64d42008-11-13 14:49:14 -08001688 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001689 struct inode *alloc_inode = ac->ac_inode;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001690
Joel Becker7d1fe092010-04-13 14:30:19 +08001691 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1692 res->sr_bg_blkno, &group_bh);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001693 if (ret < 0) {
1694 mlog_errno(ret);
1695 return ret;
1696 }
1697
1698 gd = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001699 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001700 ac->ac_max_block, res);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001701 if (ret < 0) {
1702 if (ret != -ENOSPC)
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706
Joel Becker13e434c2010-03-26 10:08:27 +08001707 if (!ret)
Joel Beckerba206632010-03-26 10:08:59 +08001708 ocfs2_bg_discontig_fix_result(ac, gd, res);
Joel Becker13e434c2010-03-26 10:08:27 +08001709
Mark Fashehe49e2762010-08-13 15:15:17 -07001710 /*
1711 * sr_bg_blkno might have been changed by
1712 * ocfs2_bg_discontig_fix_result
1713 */
1714 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1715
1716 if (ac->ac_find_loc_only)
1717 goto out_loc_only;
1718
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001719 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001720 res->sr_bits,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001721 le16_to_cpu(gd->bg_chain));
1722 if (ret < 0) {
1723 mlog_errno(ret);
1724 goto out;
1725 }
1726
1727 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001728 res->sr_bit_offset, res->sr_bits);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001729 if (ret < 0)
1730 mlog_errno(ret);
1731
Mark Fashehe49e2762010-08-13 15:15:17 -07001732out_loc_only:
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001733 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1734
1735out:
1736 brelse(group_bh);
1737
1738 return ret;
1739}
1740
Mark Fashehccd979b2005-12-15 14:31:24 -08001741static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001742 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001743 u32 bits_wanted,
1744 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001745 struct ocfs2_suballoc_result *res,
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001746 u16 *bits_left)
Mark Fashehccd979b2005-12-15 14:31:24 -08001747{
1748 int status;
Joel Becker7d1fe092010-04-13 14:30:19 +08001749 u16 chain;
Mark Fashehccd979b2005-12-15 14:31:24 -08001750 u64 next_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001751 struct inode *alloc_inode = ac->ac_inode;
1752 struct buffer_head *group_bh = NULL;
1753 struct buffer_head *prev_group_bh = NULL;
1754 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1755 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1756 struct ocfs2_group_desc *bg;
1757
1758 chain = ac->ac_chain;
Mark Fashehb0697052006-03-03 10:24:33 -08001759 mlog(0, "trying to alloc %u bits from chain %u, inode %llu\n",
1760 bits_wanted, chain,
1761 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08001762
Joel Becker68f64d42008-11-13 14:49:14 -08001763 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1764 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1765 &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001766 if (status < 0) {
1767 mlog_errno(status);
1768 goto bail;
1769 }
1770 bg = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -08001771
1772 status = -ENOSPC;
1773 /* for now, the chain search is a bit simplistic. We just use
1774 * the 1st group with any empty bits. */
Joel Becker1187c962008-09-03 20:03:39 -07001775 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1776 bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001777 ac->ac_max_block,
1778 res)) == -ENOSPC) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001779 if (!bg->bg_next_group)
1780 break;
Mark Fasheha81cb882008-10-07 14:25:16 -07001781
1782 brelse(prev_group_bh);
1783 prev_group_bh = NULL;
1784
Mark Fashehccd979b2005-12-15 14:31:24 -08001785 next_group = le64_to_cpu(bg->bg_next_group);
1786 prev_group_bh = group_bh;
1787 group_bh = NULL;
Joel Becker68f64d42008-11-13 14:49:14 -08001788 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1789 next_group, &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001790 if (status < 0) {
1791 mlog_errno(status);
1792 goto bail;
1793 }
1794 bg = (struct ocfs2_group_desc *) group_bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -08001795 }
1796 if (status < 0) {
1797 if (status != -ENOSPC)
1798 mlog_errno(status);
1799 goto bail;
1800 }
1801
Mark Fashehb0697052006-03-03 10:24:33 -08001802 mlog(0, "alloc succeeds: we give %u bits from block group %llu\n",
Joel Becker7d1fe092010-04-13 14:30:19 +08001803 res->sr_bits, (unsigned long long)le64_to_cpu(bg->bg_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -08001804
Joel Becker7d1fe092010-04-13 14:30:19 +08001805 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08001806
Joel Becker7d1fe092010-04-13 14:30:19 +08001807 BUG_ON(res->sr_bits == 0);
Joel Becker13e434c2010-03-26 10:08:27 +08001808 if (!status)
Joel Beckerba206632010-03-26 10:08:59 +08001809 ocfs2_bg_discontig_fix_result(ac, bg, res);
Joel Becker13e434c2010-03-26 10:08:27 +08001810
Mark Fashehe49e2762010-08-13 15:15:17 -07001811 /*
1812 * sr_bg_blkno might have been changed by
1813 * ocfs2_bg_discontig_fix_result
1814 */
1815 res->sr_bg_stable_blkno = group_bh->b_blocknr;
Mark Fashehccd979b2005-12-15 14:31:24 -08001816
1817 /*
1818 * Keep track of previous block descriptor read. When
1819 * we find a target, if we have read more than X
1820 * number of descriptors, and the target is reasonably
1821 * empty, relink him to top of his chain.
1822 *
1823 * We've read 0 extra blocks and only send one more to
1824 * the transaction, yet the next guy to search has a
1825 * much easier time.
1826 *
1827 * Do this *after* figuring out how many bits we're taking out
1828 * of our target group.
1829 */
1830 if (ac->ac_allow_chain_relink &&
1831 (prev_group_bh) &&
Joel Becker7d1fe092010-04-13 14:30:19 +08001832 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001833 status = ocfs2_relink_block_group(handle, alloc_inode,
1834 ac->ac_bh, group_bh,
1835 prev_group_bh, chain);
1836 if (status < 0) {
1837 mlog_errno(status);
1838 goto bail;
1839 }
1840 }
1841
Mark Fashehe49e2762010-08-13 15:15:17 -07001842 if (ac->ac_find_loc_only)
1843 goto out_loc_only;
1844
Mark Fashehd5134982010-08-13 15:15:16 -07001845 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1846 ac->ac_bh, res->sr_bits,
1847 chain);
1848 if (status) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001849 mlog_errno(status);
1850 goto bail;
1851 }
1852
Mark Fashehccd979b2005-12-15 14:31:24 -08001853 status = ocfs2_block_group_set_bits(handle,
1854 alloc_inode,
1855 bg,
1856 group_bh,
Joel Becker7d1fe092010-04-13 14:30:19 +08001857 res->sr_bit_offset,
1858 res->sr_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -08001859 if (status < 0) {
1860 mlog_errno(status);
1861 goto bail;
1862 }
1863
Joel Becker7d1fe092010-04-13 14:30:19 +08001864 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
Mark Fasheh1ca1a112007-04-27 16:01:25 -07001865 (unsigned long long)le64_to_cpu(fe->i_blkno));
Mark Fashehccd979b2005-12-15 14:31:24 -08001866
Mark Fashehe49e2762010-08-13 15:15:17 -07001867out_loc_only:
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001868 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
Mark Fashehccd979b2005-12-15 14:31:24 -08001869bail:
Mark Fasheha81cb882008-10-07 14:25:16 -07001870 brelse(group_bh);
1871 brelse(prev_group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001872
1873 mlog_exit(status);
1874 return status;
1875}
1876
1877/* will give out up to bits_wanted contiguous bits. */
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001878static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001879 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001880 u32 bits_wanted,
1881 u32 min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001882 struct ocfs2_suballoc_result *res)
Mark Fashehccd979b2005-12-15 14:31:24 -08001883{
1884 int status;
1885 u16 victim, i;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001886 u16 bits_left = 0;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001887 u64 hint = ac->ac_last_group;
Mark Fashehccd979b2005-12-15 14:31:24 -08001888 struct ocfs2_chain_list *cl;
1889 struct ocfs2_dinode *fe;
1890
1891 mlog_entry_void();
1892
1893 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1894 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1895 BUG_ON(!ac->ac_bh);
1896
1897 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
Joel Becker10995aa2008-11-13 14:49:12 -08001898
1899 /* The bh was validated by the inode read during
1900 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1901 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1902
Mark Fashehccd979b2005-12-15 14:31:24 -08001903 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1904 le32_to_cpu(fe->id1.bitmap1.i_total)) {
Joel Beckeraa8f8e92010-03-26 10:08:07 +08001905 ocfs2_error(ac->ac_inode->i_sb,
1906 "Chain allocator dinode %llu has %u used "
Mark Fashehb0697052006-03-03 10:24:33 -08001907 "bits but only %u total.",
1908 (unsigned long long)le64_to_cpu(fe->i_blkno),
Mark Fashehccd979b2005-12-15 14:31:24 -08001909 le32_to_cpu(fe->id1.bitmap1.i_used),
1910 le32_to_cpu(fe->id1.bitmap1.i_total));
1911 status = -EIO;
1912 goto bail;
1913 }
1914
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001915 res->sr_bg_blkno = hint;
Joel Becker7d1fe092010-04-13 14:30:19 +08001916 if (res->sr_bg_blkno) {
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001917 /* Attempt to short-circuit the usual search mechanism
1918 * by jumping straight to the most recently used
1919 * allocation group. This helps us mantain some
1920 * contiguousness across allocations. */
Mark Fashehda5cbf22006-10-06 18:34:35 -07001921 status = ocfs2_search_one_group(ac, handle, bits_wanted,
Joel Becker7d1fe092010-04-13 14:30:19 +08001922 min_bits, res, &bits_left);
1923 if (!status)
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001924 goto set_hint;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001925 if (status < 0 && status != -ENOSPC) {
1926 mlog_errno(status);
1927 goto bail;
1928 }
1929 }
1930
Mark Fashehccd979b2005-12-15 14:31:24 -08001931 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1932
1933 victim = ocfs2_find_victim_chain(cl);
1934 ac->ac_chain = victim;
1935 ac->ac_allow_chain_relink = 1;
1936
Joel Becker7d1fe092010-04-13 14:30:19 +08001937 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1938 res, &bits_left);
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001939 if (!status) {
1940 hint = ocfs2_group_from_res(res);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001941 goto set_hint;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001942 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001943 if (status < 0 && status != -ENOSPC) {
1944 mlog_errno(status);
1945 goto bail;
1946 }
1947
1948 mlog(0, "Search of victim chain %u came up with nothing, "
1949 "trying all chains now.\n", victim);
1950
1951 /* If we didn't pick a good victim, then just default to
1952 * searching each chain in order. Don't allow chain relinking
1953 * because we only calculate enough journal credits for one
1954 * relink per alloc. */
1955 ac->ac_allow_chain_relink = 0;
1956 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1957 if (i == victim)
1958 continue;
1959 if (!cl->cl_recs[i].c_free)
1960 continue;
1961
1962 ac->ac_chain = i;
Mark Fashehda5cbf22006-10-06 18:34:35 -07001963 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
Joel Becker7d1fe092010-04-13 14:30:19 +08001964 res, &bits_left);
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001965 if (!status) {
1966 hint = ocfs2_group_from_res(res);
Mark Fashehccd979b2005-12-15 14:31:24 -08001967 break;
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001968 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001969 if (status < 0 && status != -ENOSPC) {
1970 mlog_errno(status);
1971 goto bail;
1972 }
1973 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001974
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001975set_hint:
1976 if (status != -ENOSPC) {
1977 /* If the next search of this group is not likely to
1978 * yield a suitable extent, then we reset the last
1979 * group hint so as to not waste a disk read */
1980 if (bits_left < min_bits)
1981 ac->ac_last_group = 0;
1982 else
Mark Fashehb2b6ebf2010-08-26 13:06:50 -07001983 ac->ac_last_group = hint;
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001984 }
1985
1986bail:
Mark Fashehccd979b2005-12-15 14:31:24 -08001987 mlog_exit(status);
1988 return status;
1989}
1990
Joel Becker1ed9b772010-05-06 13:59:06 +08001991int ocfs2_claim_metadata(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001992 struct ocfs2_alloc_context *ac,
1993 u32 bits_wanted,
Joel Becker2b6cb572010-03-26 10:09:15 +08001994 u64 *suballoc_loc,
Mark Fashehccd979b2005-12-15 14:31:24 -08001995 u16 *suballoc_bit_start,
1996 unsigned int *num_bits,
1997 u64 *blkno_start)
1998{
1999 int status;
Joel Beckerba206632010-03-26 10:08:59 +08002000 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
Mark Fashehccd979b2005-12-15 14:31:24 -08002001
2002 BUG_ON(!ac);
2003 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
2004 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
Mark Fashehccd979b2005-12-15 14:31:24 -08002005
Joel Beckeraa8f8e92010-03-26 10:08:07 +08002006 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07002007 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002008 bits_wanted,
2009 1,
Joel Becker7d1fe092010-04-13 14:30:19 +08002010 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002011 if (status < 0) {
2012 mlog_errno(status);
2013 goto bail;
2014 }
Joel Becker1ed9b772010-05-06 13:59:06 +08002015 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
Mark Fashehccd979b2005-12-15 14:31:24 -08002016
Joel Becker2b6cb572010-03-26 10:09:15 +08002017 *suballoc_loc = res.sr_bg_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002018 *suballoc_bit_start = res.sr_bit_offset;
Joel Beckerba206632010-03-26 10:08:59 +08002019 *blkno_start = res.sr_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002020 ac->ac_bits_given += res.sr_bits;
2021 *num_bits = res.sr_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -08002022 status = 0;
2023bail:
2024 mlog_exit(status);
2025 return status;
2026}
2027
Tao Ma13821152009-02-25 00:53:23 +08002028static void ocfs2_init_inode_ac_group(struct inode *dir,
Tao Maabf1b3c2010-04-27 08:30:36 +08002029 struct buffer_head *parent_di_bh,
Tao Ma13821152009-02-25 00:53:23 +08002030 struct ocfs2_alloc_context *ac)
2031{
Tao Maabf1b3c2010-04-27 08:30:36 +08002032 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
Tao Ma13821152009-02-25 00:53:23 +08002033 /*
2034 * Try to allocate inodes from some specific group.
2035 *
2036 * If the parent dir has recorded the last group used in allocation,
2037 * cool, use it. Otherwise if we try to allocate new inode from the
2038 * same slot the parent dir belongs to, use the same chunk.
2039 *
2040 * We are very careful here to avoid the mistake of setting
2041 * ac_last_group to a group descriptor from a different (unlocked) slot.
2042 */
2043 if (OCFS2_I(dir)->ip_last_used_group &&
2044 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2045 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
Tao Maabf1b3c2010-04-27 08:30:36 +08002046 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2047 if (di->i_suballoc_loc)
2048 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2049 else
2050 ac->ac_last_group = ocfs2_which_suballoc_group(
2051 le64_to_cpu(di->i_blkno),
2052 le16_to_cpu(di->i_suballoc_bit));
2053 }
Tao Ma13821152009-02-25 00:53:23 +08002054}
2055
2056static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2057 struct ocfs2_alloc_context *ac)
2058{
2059 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2060 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2061}
2062
Mark Fashehe49e2762010-08-13 15:15:17 -07002063int ocfs2_find_new_inode_loc(struct inode *dir,
2064 struct buffer_head *parent_fe_bh,
2065 struct ocfs2_alloc_context *ac,
2066 u64 *fe_blkno)
2067{
2068 int ret;
2069 handle_t *handle = NULL;
2070 struct ocfs2_suballoc_result *res;
2071
2072 BUG_ON(!ac);
2073 BUG_ON(ac->ac_bits_given != 0);
2074 BUG_ON(ac->ac_bits_wanted != 1);
2075 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2076
2077 res = kzalloc(sizeof(*res), GFP_NOFS);
2078 if (res == NULL) {
2079 ret = -ENOMEM;
2080 mlog_errno(ret);
2081 goto out;
2082 }
2083
2084 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2085
2086 /*
2087 * The handle started here is for chain relink. Alternatively,
2088 * we could just disable relink for these calls.
2089 */
2090 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2091 if (IS_ERR(handle)) {
2092 ret = PTR_ERR(handle);
2093 handle = NULL;
2094 mlog_errno(ret);
2095 goto out;
2096 }
2097
2098 /*
2099 * This will instruct ocfs2_claim_suballoc_bits and
2100 * ocfs2_search_one_group to search but save actual allocation
2101 * for later.
2102 */
2103 ac->ac_find_loc_only = 1;
2104
2105 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2106 if (ret < 0) {
2107 mlog_errno(ret);
2108 goto out;
2109 }
2110
2111 ac->ac_find_loc_priv = res;
2112 *fe_blkno = res->sr_blkno;
2113
2114out:
2115 if (handle)
2116 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2117
2118 if (ret)
2119 kfree(res);
2120
2121 return ret;
2122}
2123
2124int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2125 struct inode *dir,
2126 struct ocfs2_alloc_context *ac,
2127 u64 *suballoc_loc,
2128 u16 *suballoc_bit,
2129 u64 di_blkno)
2130{
2131 int ret;
2132 u16 chain;
2133 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2134 struct buffer_head *bg_bh = NULL;
2135 struct ocfs2_group_desc *bg;
2136 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2137
2138 /*
2139 * Since di_blkno is being passed back in, we check for any
2140 * inconsistencies which may have happened between
2141 * calls. These are code bugs as di_blkno is not expected to
2142 * change once returned from ocfs2_find_new_inode_loc()
2143 */
2144 BUG_ON(res->sr_blkno != di_blkno);
2145
2146 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2147 res->sr_bg_stable_blkno, &bg_bh);
2148 if (ret) {
2149 mlog_errno(ret);
2150 goto out;
2151 }
2152
2153 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2154 chain = le16_to_cpu(bg->bg_chain);
2155
2156 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2157 ac->ac_bh, res->sr_bits,
2158 chain);
2159 if (ret) {
2160 mlog_errno(ret);
2161 goto out;
2162 }
2163
2164 ret = ocfs2_block_group_set_bits(handle,
2165 ac->ac_inode,
2166 bg,
2167 bg_bh,
2168 res->sr_bit_offset,
2169 res->sr_bits);
2170 if (ret < 0) {
2171 mlog_errno(ret);
2172 goto out;
2173 }
2174
2175 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
2176 (unsigned long long)di_blkno);
2177
2178 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2179
2180 BUG_ON(res->sr_bits != 1);
2181
2182 *suballoc_loc = res->sr_bg_blkno;
2183 *suballoc_bit = res->sr_bit_offset;
2184 ac->ac_bits_given++;
2185 ocfs2_save_inode_ac_group(dir, ac);
2186
2187out:
2188 brelse(bg_bh);
2189
2190 return ret;
2191}
2192
Joel Becker1ed9b772010-05-06 13:59:06 +08002193int ocfs2_claim_new_inode(handle_t *handle,
Tao Ma13821152009-02-25 00:53:23 +08002194 struct inode *dir,
2195 struct buffer_head *parent_fe_bh,
Mark Fashehccd979b2005-12-15 14:31:24 -08002196 struct ocfs2_alloc_context *ac,
Joel Becker2b6cb572010-03-26 10:09:15 +08002197 u64 *suballoc_loc,
Mark Fashehccd979b2005-12-15 14:31:24 -08002198 u16 *suballoc_bit,
2199 u64 *fe_blkno)
2200{
2201 int status;
Joel Becker2b6cb572010-03-26 10:09:15 +08002202 struct ocfs2_suballoc_result res;
Mark Fashehccd979b2005-12-15 14:31:24 -08002203
2204 mlog_entry_void();
2205
2206 BUG_ON(!ac);
2207 BUG_ON(ac->ac_bits_given != 0);
2208 BUG_ON(ac->ac_bits_wanted != 1);
2209 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002210
Tao Ma13821152009-02-25 00:53:23 +08002211 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2212
Joel Beckeraa8f8e92010-03-26 10:08:07 +08002213 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07002214 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002215 1,
2216 1,
Joel Becker7d1fe092010-04-13 14:30:19 +08002217 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002218 if (status < 0) {
2219 mlog_errno(status);
2220 goto bail;
2221 }
Joel Becker1ed9b772010-05-06 13:59:06 +08002222 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
Mark Fashehccd979b2005-12-15 14:31:24 -08002223
Joel Becker7d1fe092010-04-13 14:30:19 +08002224 BUG_ON(res.sr_bits != 1);
Mark Fashehccd979b2005-12-15 14:31:24 -08002225
Joel Becker2b6cb572010-03-26 10:09:15 +08002226 *suballoc_loc = res.sr_bg_blkno;
Joel Becker7d1fe092010-04-13 14:30:19 +08002227 *suballoc_bit = res.sr_bit_offset;
Joel Beckerba206632010-03-26 10:08:59 +08002228 *fe_blkno = res.sr_blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -08002229 ac->ac_bits_given++;
Tao Ma13821152009-02-25 00:53:23 +08002230 ocfs2_save_inode_ac_group(dir, ac);
Mark Fashehccd979b2005-12-15 14:31:24 -08002231 status = 0;
2232bail:
2233 mlog_exit(status);
2234 return status;
2235}
2236
2237/* translate a group desc. blkno and it's bitmap offset into
2238 * disk cluster offset. */
2239static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2240 u64 bg_blkno,
2241 u16 bg_bit_off)
2242{
2243 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2244 u32 cluster = 0;
2245
2246 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2247
2248 if (bg_blkno != osb->first_cluster_group_blkno)
2249 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2250 cluster += (u32) bg_bit_off;
2251 return cluster;
2252}
2253
2254/* given a cluster offset, calculate which block group it belongs to
2255 * and return that block offset. */
Tao Mad6590722007-12-18 15:47:03 +08002256u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
Mark Fashehccd979b2005-12-15 14:31:24 -08002257{
2258 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2259 u32 group_no;
2260
2261 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2262
2263 group_no = cluster / osb->bitmap_cpg;
2264 if (!group_no)
2265 return osb->first_cluster_group_blkno;
2266 return ocfs2_clusters_to_blocks(inode->i_sb,
2267 group_no * osb->bitmap_cpg);
2268}
2269
2270/* given the block number of a cluster start, calculate which cluster
2271 * group and descriptor bitmap offset that corresponds to. */
2272static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2273 u64 data_blkno,
2274 u64 *bg_blkno,
2275 u16 *bg_bit_off)
2276{
2277 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2278 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2279
2280 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2281
2282 *bg_blkno = ocfs2_which_cluster_group(inode,
2283 data_cluster);
2284
2285 if (*bg_blkno == osb->first_cluster_group_blkno)
2286 *bg_bit_off = (u16) data_cluster;
2287 else
2288 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2289 data_blkno - *bg_blkno);
2290}
2291
2292/*
2293 * min_bits - minimum contiguous chunk from this total allocation we
2294 * can handle. set to what we asked for originally for a full
2295 * contig. allocation, set to '1' to indicate we can deal with extents
2296 * of any size.
2297 */
Joel Becker1ed9b772010-05-06 13:59:06 +08002298int __ocfs2_claim_clusters(handle_t *handle,
Mark Fasheh415cb802007-09-16 20:10:16 -07002299 struct ocfs2_alloc_context *ac,
2300 u32 min_clusters,
2301 u32 max_clusters,
2302 u32 *cluster_start,
2303 u32 *num_clusters)
Mark Fashehccd979b2005-12-15 14:31:24 -08002304{
2305 int status;
Mark Fasheh415cb802007-09-16 20:10:16 -07002306 unsigned int bits_wanted = max_clusters;
Joel Beckerba206632010-03-26 10:08:59 +08002307 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
Joel Becker1ed9b772010-05-06 13:59:06 +08002308 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002309
2310 mlog_entry_void();
2311
Mark Fashehccd979b2005-12-15 14:31:24 -08002312 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2313
2314 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2315 && ac->ac_which != OCFS2_AC_USE_MAIN);
Mark Fashehccd979b2005-12-15 14:31:24 -08002316
2317 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
Mark Fasheh33d5d382010-02-24 13:34:09 -08002318 WARN_ON(min_clusters > 1);
2319
Mark Fashehccd979b2005-12-15 14:31:24 -08002320 status = ocfs2_claim_local_alloc_bits(osb,
2321 handle,
2322 ac,
2323 bits_wanted,
2324 cluster_start,
2325 num_clusters);
2326 if (!status)
2327 atomic_inc(&osb->alloc_stats.local_data);
2328 } else {
2329 if (min_clusters > (osb->bitmap_cpg - 1)) {
2330 /* The only paths asking for contiguousness
2331 * should know about this already. */
Sunil Mushran2fbe8d12007-12-20 14:58:11 -08002332 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2333 "group bitmap size %u!\n", min_clusters,
2334 osb->bitmap_cpg);
Mark Fashehccd979b2005-12-15 14:31:24 -08002335 status = -ENOSPC;
2336 goto bail;
2337 }
2338 /* clamp the current request down to a realistic size. */
2339 if (bits_wanted > (osb->bitmap_cpg - 1))
2340 bits_wanted = osb->bitmap_cpg - 1;
2341
Joel Beckeraa8f8e92010-03-26 10:08:07 +08002342 status = ocfs2_claim_suballoc_bits(ac,
Mark Fashehda5cbf22006-10-06 18:34:35 -07002343 handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002344 bits_wanted,
2345 min_clusters,
Joel Becker7d1fe092010-04-13 14:30:19 +08002346 &res);
Mark Fashehccd979b2005-12-15 14:31:24 -08002347 if (!status) {
Joel Beckerba206632010-03-26 10:08:59 +08002348 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
Mark Fashehccd979b2005-12-15 14:31:24 -08002349 *cluster_start =
2350 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
Joel Becker7d1fe092010-04-13 14:30:19 +08002351 res.sr_bg_blkno,
2352 res.sr_bit_offset);
Mark Fashehccd979b2005-12-15 14:31:24 -08002353 atomic_inc(&osb->alloc_stats.bitmap_data);
Tao Ma47119542010-04-22 14:09:15 +08002354 *num_clusters = res.sr_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -08002355 }
2356 }
2357 if (status < 0) {
2358 if (status != -ENOSPC)
2359 mlog_errno(status);
2360 goto bail;
2361 }
2362
Tao Ma47119542010-04-22 14:09:15 +08002363 ac->ac_bits_given += *num_clusters;
Mark Fashehccd979b2005-12-15 14:31:24 -08002364
2365bail:
2366 mlog_exit(status);
2367 return status;
2368}
2369
Joel Becker1ed9b772010-05-06 13:59:06 +08002370int ocfs2_claim_clusters(handle_t *handle,
Mark Fasheh415cb802007-09-16 20:10:16 -07002371 struct ocfs2_alloc_context *ac,
2372 u32 min_clusters,
2373 u32 *cluster_start,
2374 u32 *num_clusters)
2375{
2376 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2377
Joel Becker1ed9b772010-05-06 13:59:06 +08002378 return __ocfs2_claim_clusters(handle, ac, min_clusters,
Mark Fasheh415cb802007-09-16 20:10:16 -07002379 bits_wanted, cluster_start, num_clusters);
2380}
2381
Mark Fashehb4414ee2010-03-11 18:31:09 -08002382static int ocfs2_block_group_clear_bits(handle_t *handle,
2383 struct inode *alloc_inode,
2384 struct ocfs2_group_desc *bg,
2385 struct buffer_head *group_bh,
2386 unsigned int bit_off,
2387 unsigned int num_bits,
2388 void (*undo_fn)(unsigned int bit,
2389 unsigned long *bmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002390{
2391 int status;
2392 unsigned int tmp;
Mark Fashehccd979b2005-12-15 14:31:24 -08002393 struct ocfs2_group_desc *undo_bg = NULL;
2394
2395 mlog_entry_void();
2396
Joel Becker42035302008-11-13 14:49:15 -08002397 /* The caller got this descriptor from
2398 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2399 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
Mark Fashehccd979b2005-12-15 14:31:24 -08002400
2401 mlog(0, "off = %u, num = %u\n", bit_off, num_bits);
2402
Mark Fashehb4414ee2010-03-11 18:31:09 -08002403 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
Joel Becker0cf2f762009-02-12 16:41:25 -08002404 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
Mark Fashehb4414ee2010-03-11 18:31:09 -08002405 group_bh,
2406 undo_fn ?
2407 OCFS2_JOURNAL_ACCESS_UNDO :
2408 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002409 if (status < 0) {
2410 mlog_errno(status);
2411 goto bail;
2412 }
2413
Mark Fashehb4414ee2010-03-11 18:31:09 -08002414 if (undo_fn) {
Sunil Mushran94e41ec2009-06-19 14:45:54 -07002415 jbd_lock_bh_state(group_bh);
2416 undo_bg = (struct ocfs2_group_desc *)
2417 bh2jh(group_bh)->b_committed_data;
2418 BUG_ON(!undo_bg);
2419 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002420
2421 tmp = num_bits;
2422 while(tmp--) {
2423 ocfs2_clear_bit((bit_off + tmp),
2424 (unsigned long *) bg->bg_bitmap);
Mark Fashehb4414ee2010-03-11 18:31:09 -08002425 if (undo_fn)
2426 undo_fn(bit_off + tmp,
2427 (unsigned long *) undo_bg->bg_bitmap);
Mark Fashehccd979b2005-12-15 14:31:24 -08002428 }
2429 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
Srinivas Eeda9b5cd102010-10-05 15:53:06 -07002430 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2431 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
2432 " count %u but claims %u are freed. num_bits %d",
2433 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2434 le16_to_cpu(bg->bg_bits),
2435 le16_to_cpu(bg->bg_free_bits_count), num_bits);
2436 return -EROFS;
2437 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002438
Mark Fashehb4414ee2010-03-11 18:31:09 -08002439 if (undo_fn)
Sunil Mushran94e41ec2009-06-19 14:45:54 -07002440 jbd_unlock_bh_state(group_bh);
2441
Joel Beckerec20cec2010-03-19 14:13:52 -07002442 ocfs2_journal_dirty(handle, group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002443bail:
2444 return status;
2445}
2446
2447/*
2448 * expects the suballoc inode to already be locked.
2449 */
Mark Fashehb4414ee2010-03-11 18:31:09 -08002450static int _ocfs2_free_suballoc_bits(handle_t *handle,
2451 struct inode *alloc_inode,
2452 struct buffer_head *alloc_bh,
2453 unsigned int start_bit,
2454 u64 bg_blkno,
2455 unsigned int count,
2456 void (*undo_fn)(unsigned int bit,
2457 unsigned long *bitmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002458{
2459 int status = 0;
2460 u32 tmp_used;
Mark Fashehccd979b2005-12-15 14:31:24 -08002461 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2462 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2463 struct buffer_head *group_bh = NULL;
2464 struct ocfs2_group_desc *group;
2465
2466 mlog_entry_void();
2467
Joel Becker10995aa2008-11-13 14:49:12 -08002468 /* The alloc_bh comes from ocfs2_free_dinode() or
2469 * ocfs2_free_clusters(). The callers have all locked the
2470 * allocator and gotten alloc_bh from the lock call. This
2471 * validates the dinode buffer. Any corruption that has happended
2472 * is a code bug. */
2473 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
Mark Fashehccd979b2005-12-15 14:31:24 -08002474 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2475
Mark Fashehb0697052006-03-03 10:24:33 -08002476 mlog(0, "%llu: freeing %u bits from group %llu, starting at %u\n",
2477 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, count,
2478 (unsigned long long)bg_blkno, start_bit);
Mark Fashehccd979b2005-12-15 14:31:24 -08002479
Joel Becker68f64d42008-11-13 14:49:14 -08002480 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2481 &group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002482 if (status < 0) {
2483 mlog_errno(status);
2484 goto bail;
2485 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002486 group = (struct ocfs2_group_desc *) group_bh->b_data;
Joel Becker68f64d42008-11-13 14:49:14 -08002487
Mark Fashehccd979b2005-12-15 14:31:24 -08002488 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2489
2490 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2491 group, group_bh,
Mark Fashehb4414ee2010-03-11 18:31:09 -08002492 start_bit, count, undo_fn);
Mark Fashehccd979b2005-12-15 14:31:24 -08002493 if (status < 0) {
2494 mlog_errno(status);
2495 goto bail;
2496 }
2497
Joel Becker0cf2f762009-02-12 16:41:25 -08002498 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2499 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08002500 if (status < 0) {
2501 mlog_errno(status);
2502 goto bail;
2503 }
2504
2505 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2506 count);
2507 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2508 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
Joel Beckerec20cec2010-03-19 14:13:52 -07002509 ocfs2_journal_dirty(handle, alloc_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002510
2511bail:
Mark Fasheha81cb882008-10-07 14:25:16 -07002512 brelse(group_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08002513
2514 mlog_exit(status);
2515 return status;
2516}
2517
Mark Fashehb4414ee2010-03-11 18:31:09 -08002518int ocfs2_free_suballoc_bits(handle_t *handle,
2519 struct inode *alloc_inode,
2520 struct buffer_head *alloc_bh,
2521 unsigned int start_bit,
2522 u64 bg_blkno,
2523 unsigned int count)
2524{
2525 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2526 start_bit, bg_blkno, count, NULL);
2527}
2528
Mark Fasheh1fabe142006-10-09 18:11:45 -07002529int ocfs2_free_dinode(handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08002530 struct inode *inode_alloc_inode,
2531 struct buffer_head *inode_alloc_bh,
2532 struct ocfs2_dinode *di)
2533{
2534 u64 blk = le64_to_cpu(di->i_blkno);
2535 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2536 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2537
Tao Ma74380c42010-03-22 14:20:18 +08002538 if (di->i_suballoc_loc)
2539 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
Mark Fashehccd979b2005-12-15 14:31:24 -08002540 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2541 inode_alloc_bh, bit, bg_blkno, 1);
2542}
2543
Mark Fashehb4414ee2010-03-11 18:31:09 -08002544static int _ocfs2_free_clusters(handle_t *handle,
2545 struct inode *bitmap_inode,
2546 struct buffer_head *bitmap_bh,
2547 u64 start_blk,
2548 unsigned int num_clusters,
2549 void (*undo_fn)(unsigned int bit,
2550 unsigned long *bitmap))
Mark Fashehccd979b2005-12-15 14:31:24 -08002551{
2552 int status;
2553 u16 bg_start_bit;
2554 u64 bg_blkno;
2555 struct ocfs2_dinode *fe;
2556
2557 /* You can't ever have a contiguous set of clusters
2558 * bigger than a block group bitmap so we never have to worry
2559 * about looping on them. */
2560
2561 mlog_entry_void();
2562
2563 /* This is expensive. We can safely remove once this stuff has
2564 * gotten tested really well. */
2565 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk)));
2566
2567 fe = (struct ocfs2_dinode *) bitmap_bh->b_data;
2568
2569 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2570 &bg_start_bit);
2571
Mark Fashehb0697052006-03-03 10:24:33 -08002572 mlog(0, "want to free %u clusters starting at block %llu\n",
2573 num_clusters, (unsigned long long)start_blk);
2574 mlog(0, "bg_blkno = %llu, bg_start_bit = %u\n",
2575 (unsigned long long)bg_blkno, bg_start_bit);
Mark Fashehccd979b2005-12-15 14:31:24 -08002576
Mark Fashehb4414ee2010-03-11 18:31:09 -08002577 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2578 bg_start_bit, bg_blkno,
2579 num_clusters, undo_fn);
Mark Fasheh9c7af402008-07-28 18:02:53 -07002580 if (status < 0) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002581 mlog_errno(status);
Mark Fasheh9c7af402008-07-28 18:02:53 -07002582 goto out;
2583 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002584
Mark Fasheh9c7af402008-07-28 18:02:53 -07002585 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2586 num_clusters);
2587
2588out:
Mark Fashehccd979b2005-12-15 14:31:24 -08002589 mlog_exit(status);
2590 return status;
2591}
2592
Mark Fashehb4414ee2010-03-11 18:31:09 -08002593int ocfs2_free_clusters(handle_t *handle,
2594 struct inode *bitmap_inode,
2595 struct buffer_head *bitmap_bh,
2596 u64 start_blk,
2597 unsigned int num_clusters)
2598{
2599 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2600 start_blk, num_clusters,
2601 _ocfs2_set_bit);
2602}
2603
2604/*
2605 * Give never-used clusters back to the global bitmap. We don't need
2606 * to protect these bits in the undo buffer.
2607 */
2608int ocfs2_release_clusters(handle_t *handle,
2609 struct inode *bitmap_inode,
2610 struct buffer_head *bitmap_bh,
2611 u64 start_blk,
2612 unsigned int num_clusters)
2613{
2614 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2615 start_blk, num_clusters,
2616 _ocfs2_clear_bit);
2617}
2618
Mark Fashehccd979b2005-12-15 14:31:24 -08002619static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg)
2620{
2621 printk("Block Group:\n");
2622 printk("bg_signature: %s\n", bg->bg_signature);
2623 printk("bg_size: %u\n", bg->bg_size);
2624 printk("bg_bits: %u\n", bg->bg_bits);
2625 printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count);
2626 printk("bg_chain: %u\n", bg->bg_chain);
2627 printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation));
Mark Fashehb0697052006-03-03 10:24:33 -08002628 printk("bg_next_group: %llu\n",
2629 (unsigned long long)bg->bg_next_group);
2630 printk("bg_parent_dinode: %llu\n",
2631 (unsigned long long)bg->bg_parent_dinode);
2632 printk("bg_blkno: %llu\n",
2633 (unsigned long long)bg->bg_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002634}
2635
2636static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
2637{
2638 int i;
2639
Mark Fashehb0697052006-03-03 10:24:33 -08002640 printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002641 printk("i_signature: %s\n", fe->i_signature);
Mark Fashehb0697052006-03-03 10:24:33 -08002642 printk("i_size: %llu\n",
2643 (unsigned long long)fe->i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -08002644 printk("i_clusters: %u\n", fe->i_clusters);
2645 printk("i_generation: %u\n",
2646 le32_to_cpu(fe->i_generation));
2647 printk("id1.bitmap1.i_used: %u\n",
2648 le32_to_cpu(fe->id1.bitmap1.i_used));
2649 printk("id1.bitmap1.i_total: %u\n",
2650 le32_to_cpu(fe->id1.bitmap1.i_total));
2651 printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg);
2652 printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc);
2653 printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count);
2654 printk("id2.i_chain.cl_next_free_rec: %u\n",
2655 fe->id2.i_chain.cl_next_free_rec);
2656 for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) {
2657 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i,
2658 fe->id2.i_chain.cl_recs[i].c_free);
2659 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i,
2660 fe->id2.i_chain.cl_recs[i].c_total);
Mark Fashehb0697052006-03-03 10:24:33 -08002661 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i,
2662 (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -08002663 }
2664}
Tao Mae7d4cb62008-08-18 17:38:44 +08002665
2666/*
2667 * For a given allocation, determine which allocators will need to be
2668 * accessed, and lock them, reserving the appropriate number of bits.
2669 *
2670 * Sparse file systems call this from ocfs2_write_begin_nolock()
2671 * and ocfs2_allocate_unwritten_extents().
2672 *
2673 * File systems which don't support holes call this from
2674 * ocfs2_extend_allocation().
2675 */
Joel Beckerf99b9b72008-08-20 19:36:33 -07002676int ocfs2_lock_allocators(struct inode *inode,
2677 struct ocfs2_extent_tree *et,
Tao Mae7d4cb62008-08-18 17:38:44 +08002678 u32 clusters_to_add, u32 extents_to_split,
2679 struct ocfs2_alloc_context **data_ac,
Joel Beckerf99b9b72008-08-20 19:36:33 -07002680 struct ocfs2_alloc_context **meta_ac)
Tao Mae7d4cb62008-08-18 17:38:44 +08002681{
2682 int ret = 0, num_free_extents;
2683 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2684 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2685
2686 *meta_ac = NULL;
2687 if (data_ac)
2688 *data_ac = NULL;
2689
2690 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2691
Joel Becker3d03a302009-02-12 17:49:26 -08002692 num_free_extents = ocfs2_num_free_extents(osb, et);
Tao Mae7d4cb62008-08-18 17:38:44 +08002693 if (num_free_extents < 0) {
2694 ret = num_free_extents;
2695 mlog_errno(ret);
2696 goto out;
2697 }
2698
2699 /*
2700 * Sparse allocation file systems need to be more conservative
2701 * with reserving room for expansion - the actual allocation
2702 * happens while we've got a journal handle open so re-taking
2703 * a cluster lock (because we ran out of room for another
2704 * extent) will violate ordering rules.
2705 *
2706 * Most of the time we'll only be seeing this 1 cluster at a time
2707 * anyway.
2708 *
2709 * Always lock for any unwritten extents - we might want to
2710 * add blocks during a split.
2711 */
2712 if (!num_free_extents ||
2713 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
Joel Beckerf99b9b72008-08-20 19:36:33 -07002714 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
Tao Mae7d4cb62008-08-18 17:38:44 +08002715 if (ret < 0) {
2716 if (ret != -ENOSPC)
2717 mlog_errno(ret);
2718 goto out;
2719 }
2720 }
2721
2722 if (clusters_to_add == 0)
2723 goto out;
2724
2725 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2726 if (ret < 0) {
2727 if (ret != -ENOSPC)
2728 mlog_errno(ret);
2729 goto out;
2730 }
2731
2732out:
2733 if (ret) {
2734 if (*meta_ac) {
2735 ocfs2_free_alloc_context(*meta_ac);
2736 *meta_ac = NULL;
2737 }
2738
2739 /*
2740 * We cannot have an error and a non null *data_ac.
2741 */
2742 }
2743
2744 return ret;
2745}
wengang wang6ca497a2009-03-06 21:29:10 +08002746
2747/*
2748 * Read the inode specified by blkno to get suballoc_slot and
2749 * suballoc_bit.
2750 */
2751static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
Tao Ma889f0042010-09-02 13:10:10 +08002752 u16 *suballoc_slot, u64 *group_blkno,
2753 u16 *suballoc_bit)
wengang wang6ca497a2009-03-06 21:29:10 +08002754{
2755 int status;
2756 struct buffer_head *inode_bh = NULL;
2757 struct ocfs2_dinode *inode_fe;
2758
Joel Becker5b09b502009-04-21 16:31:20 -07002759 mlog_entry("blkno: %llu\n", (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002760
2761 /* dirty read disk */
2762 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2763 if (status < 0) {
Joel Becker5b09b502009-04-21 16:31:20 -07002764 mlog(ML_ERROR, "read block %llu failed %d\n",
2765 (unsigned long long)blkno, status);
wengang wang6ca497a2009-03-06 21:29:10 +08002766 goto bail;
2767 }
2768
2769 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2770 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
Joel Becker5b09b502009-04-21 16:31:20 -07002771 mlog(ML_ERROR, "invalid inode %llu requested\n",
2772 (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002773 status = -EINVAL;
2774 goto bail;
2775 }
2776
Tao Ma0fba8132009-03-19 05:08:43 +08002777 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
wengang wang6ca497a2009-03-06 21:29:10 +08002778 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2779 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
Joel Becker5b09b502009-04-21 16:31:20 -07002780 (unsigned long long)blkno,
2781 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
wengang wang6ca497a2009-03-06 21:29:10 +08002782 status = -EINVAL;
2783 goto bail;
2784 }
2785
2786 if (suballoc_slot)
2787 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2788 if (suballoc_bit)
2789 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
Tao Ma889f0042010-09-02 13:10:10 +08002790 if (group_blkno)
2791 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
wengang wang6ca497a2009-03-06 21:29:10 +08002792
2793bail:
2794 brelse(inode_bh);
2795
2796 mlog_exit(status);
2797 return status;
2798}
2799
2800/*
2801 * test whether bit is SET in allocator bitmap or not. on success, 0
2802 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2803 * is returned and *res is meaningless. Call this after you have
2804 * cluster locked against suballoc, or you may get a result based on
2805 * non-up2date contents
2806 */
2807static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2808 struct inode *suballoc,
Tao Ma889f0042010-09-02 13:10:10 +08002809 struct buffer_head *alloc_bh,
2810 u64 group_blkno, u64 blkno,
wengang wang6ca497a2009-03-06 21:29:10 +08002811 u16 bit, int *res)
2812{
Tao Maabf1b3c2010-04-27 08:30:36 +08002813 struct ocfs2_dinode *alloc_di;
wengang wang6ca497a2009-03-06 21:29:10 +08002814 struct ocfs2_group_desc *group;
2815 struct buffer_head *group_bh = NULL;
2816 u64 bg_blkno;
2817 int status;
2818
Joel Becker5b09b502009-04-21 16:31:20 -07002819 mlog_entry("blkno: %llu bit: %u\n", (unsigned long long)blkno,
2820 (unsigned int)bit);
wengang wang6ca497a2009-03-06 21:29:10 +08002821
Tao Maabf1b3c2010-04-27 08:30:36 +08002822 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2823 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
wengang wang6ca497a2009-03-06 21:29:10 +08002824 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2825 (unsigned int)bit,
Tao Maabf1b3c2010-04-27 08:30:36 +08002826 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
wengang wang6ca497a2009-03-06 21:29:10 +08002827 status = -EINVAL;
2828 goto bail;
2829 }
2830
Tao Ma889f0042010-09-02 13:10:10 +08002831 bg_blkno = group_blkno ? group_blkno :
2832 ocfs2_which_suballoc_group(blkno, bit);
Tao Maabf1b3c2010-04-27 08:30:36 +08002833 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
wengang wang6ca497a2009-03-06 21:29:10 +08002834 &group_bh);
2835 if (status < 0) {
Joel Becker5b09b502009-04-21 16:31:20 -07002836 mlog(ML_ERROR, "read group %llu failed %d\n",
2837 (unsigned long long)bg_blkno, status);
wengang wang6ca497a2009-03-06 21:29:10 +08002838 goto bail;
2839 }
2840
2841 group = (struct ocfs2_group_desc *) group_bh->b_data;
2842 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2843
2844bail:
2845 brelse(group_bh);
2846
2847 mlog_exit(status);
2848 return status;
2849}
2850
2851/*
2852 * Test if the bit representing this inode (blkno) is set in the
2853 * suballocator.
2854 *
2855 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2856 *
2857 * In the event of failure, a negative value is returned and *res is
2858 * meaningless.
2859 *
2860 * Callers must make sure to hold nfs_sync_lock to prevent
2861 * ocfs2_delete_inode() on another node from accessing the same
2862 * suballocator concurrently.
2863 */
2864int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2865{
2866 int status;
Tao Ma889f0042010-09-02 13:10:10 +08002867 u64 group_blkno = 0;
wengang wang6ca497a2009-03-06 21:29:10 +08002868 u16 suballoc_bit = 0, suballoc_slot = 0;
2869 struct inode *inode_alloc_inode;
2870 struct buffer_head *alloc_bh = NULL;
2871
Joel Becker5b09b502009-04-21 16:31:20 -07002872 mlog_entry("blkno: %llu", (unsigned long long)blkno);
wengang wang6ca497a2009-03-06 21:29:10 +08002873
2874 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
Tao Ma889f0042010-09-02 13:10:10 +08002875 &group_blkno, &suballoc_bit);
wengang wang6ca497a2009-03-06 21:29:10 +08002876 if (status < 0) {
2877 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2878 goto bail;
2879 }
2880
2881 inode_alloc_inode =
2882 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
2883 suballoc_slot);
2884 if (!inode_alloc_inode) {
2885 /* the error code could be inaccurate, but we are not able to
2886 * get the correct one. */
2887 status = -EINVAL;
2888 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2889 (u32)suballoc_slot);
2890 goto bail;
2891 }
2892
2893 mutex_lock(&inode_alloc_inode->i_mutex);
2894 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2895 if (status < 0) {
2896 mutex_unlock(&inode_alloc_inode->i_mutex);
2897 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2898 (u32)suballoc_slot, status);
2899 goto bail;
2900 }
2901
2902 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
Tao Ma889f0042010-09-02 13:10:10 +08002903 group_blkno, blkno, suballoc_bit, res);
wengang wang6ca497a2009-03-06 21:29:10 +08002904 if (status < 0)
2905 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2906
2907 ocfs2_inode_unlock(inode_alloc_inode, 0);
2908 mutex_unlock(&inode_alloc_inode->i_mutex);
2909
2910 iput(inode_alloc_inode);
2911 brelse(alloc_bh);
2912bail:
2913 mlog_exit(status);
2914 return status;
2915}