blob: ac10f83edb95a47650ed5c19ee583476478347f1 [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 * localalloc.c
5 *
6 * Node local data allocation
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#include <linux/fs.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/highmem.h>
30#include <linux/bitops.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 Becker13723d02008-10-17 19:25:01 -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
47#include "buffer_head_io.h"
48
49#define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
50
Mark Fashehccd979b2005-12-15 14:31:24 -080051static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
52
53static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
54 struct ocfs2_dinode *alloc,
55 u32 numbits);
56
57static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
58
59static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
Mark Fasheh1fabe142006-10-09 18:11:45 -070060 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -080061 struct ocfs2_dinode *alloc,
62 struct inode *main_bm_inode,
63 struct buffer_head *main_bm_bh);
64
65static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
Mark Fashehccd979b2005-12-15 14:31:24 -080066 struct ocfs2_alloc_context **ac,
67 struct inode **bitmap_inode,
68 struct buffer_head **bitmap_bh);
69
70static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
Mark Fasheh1fabe142006-10-09 18:11:45 -070071 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -080072 struct ocfs2_alloc_context *ac);
73
74static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
75 struct inode *local_alloc_inode);
76
Mark Fasheh9c7af402008-07-28 18:02:53 -070077static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
78{
79 return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
80 osb->local_alloc_state == OCFS2_LA_ENABLED);
81}
82
83void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
84 unsigned int num_clusters)
85{
86 spin_lock(&osb->osb_lock);
87 if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
88 osb->local_alloc_state == OCFS2_LA_THROTTLED)
89 if (num_clusters >= osb->local_alloc_default_bits) {
90 cancel_delayed_work(&osb->la_enable_wq);
91 osb->local_alloc_state = OCFS2_LA_ENABLED;
92 }
93 spin_unlock(&osb->osb_lock);
94}
95
96void ocfs2_la_enable_worker(struct work_struct *work)
97{
98 struct ocfs2_super *osb =
99 container_of(work, struct ocfs2_super,
100 la_enable_wq.work);
101 spin_lock(&osb->osb_lock);
102 osb->local_alloc_state = OCFS2_LA_ENABLED;
103 spin_unlock(&osb->osb_lock);
104}
105
Mark Fashehccd979b2005-12-15 14:31:24 -0800106/*
107 * Tell us whether a given allocation should use the local alloc
108 * file. Otherwise, it has to go to the main bitmap.
Mark Fasheh9c7af402008-07-28 18:02:53 -0700109 *
110 * This function does semi-dirty reads of local alloc size and state!
111 * This is ok however, as the values are re-checked once under mutex.
Mark Fashehccd979b2005-12-15 14:31:24 -0800112 */
113int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
114{
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800115 int ret = 0;
Mark Fasheh9c7af402008-07-28 18:02:53 -0700116 int la_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -0800117
Mark Fasheh9c7af402008-07-28 18:02:53 -0700118 spin_lock(&osb->osb_lock);
119 la_bits = osb->local_alloc_bits;
120
121 if (!ocfs2_la_state_enabled(osb))
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800122 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -0800123
124 /* la_bits should be at least twice the size (in clusters) of
125 * a new block group. We want to be sure block group
126 * allocations go through the local alloc, so allow an
127 * allocation to take up to half the bitmap. */
128 if (bits > (la_bits / 2))
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800129 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -0800130
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800131 ret = 1;
132bail:
133 mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
134 osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
Mark Fasheh9c7af402008-07-28 18:02:53 -0700135 spin_unlock(&osb->osb_lock);
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800136 return ret;
Mark Fashehccd979b2005-12-15 14:31:24 -0800137}
138
139int ocfs2_load_local_alloc(struct ocfs2_super *osb)
140{
141 int status = 0;
142 struct ocfs2_dinode *alloc = NULL;
143 struct buffer_head *alloc_bh = NULL;
144 u32 num_used;
145 struct inode *inode = NULL;
146 struct ocfs2_local_alloc *la;
147
148 mlog_entry_void();
149
Mark Fashehebcee4b2008-07-28 14:55:20 -0700150 if (osb->local_alloc_bits == 0)
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800151 goto bail;
152
Mark Fashehebcee4b2008-07-28 14:55:20 -0700153 if (osb->local_alloc_bits >= osb->bitmap_cpg) {
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800154 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
155 "than max possible %u. Using defaults.\n",
Mark Fashehebcee4b2008-07-28 14:55:20 -0700156 osb->local_alloc_bits, (osb->bitmap_cpg - 1));
157 osb->local_alloc_bits =
158 ocfs2_megabytes_to_clusters(osb->sb,
159 OCFS2_DEFAULT_LOCAL_ALLOC_SIZE);
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800160 }
161
Mark Fashehccd979b2005-12-15 14:31:24 -0800162 /* read the alloc off disk */
163 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
164 osb->slot_num);
165 if (!inode) {
166 status = -EINVAL;
167 mlog_errno(status);
168 goto bail;
169 }
170
Joel Beckerb657c952008-11-13 14:49:11 -0800171 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
172 OCFS2_BH_IGNORE_CACHE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800173 if (status < 0) {
174 mlog_errno(status);
175 goto bail;
176 }
177
178 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
179 la = OCFS2_LOCAL_ALLOC(alloc);
180
181 if (!(le32_to_cpu(alloc->i_flags) &
182 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
Mark Fashehb06970532006-03-03 10:24:33 -0800183 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
184 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800185 status = -EINVAL;
186 goto bail;
187 }
188
189 if ((la->la_size == 0) ||
190 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
191 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
192 le16_to_cpu(la->la_size));
193 status = -EINVAL;
194 goto bail;
195 }
196
197 /* do a little verification. */
198 num_used = ocfs2_local_alloc_count_bits(alloc);
199
200 /* hopefully the local alloc has always been recovered before
201 * we load it. */
202 if (num_used
203 || alloc->id1.bitmap1.i_used
204 || alloc->id1.bitmap1.i_total
205 || la->la_bm_off)
206 mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
207 "found = %u, set = %u, taken = %u, off = %u\n",
208 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
209 le32_to_cpu(alloc->id1.bitmap1.i_total),
210 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
211
212 osb->local_alloc_bh = alloc_bh;
213 osb->local_alloc_state = OCFS2_LA_ENABLED;
214
215bail:
216 if (status < 0)
Mark Fasheha81cb882008-10-07 14:25:16 -0700217 brelse(alloc_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800218 if (inode)
219 iput(inode);
220
Mark Fashehebcee4b2008-07-28 14:55:20 -0700221 mlog(0, "Local alloc window bits = %d\n", osb->local_alloc_bits);
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800222
Mark Fashehccd979b2005-12-15 14:31:24 -0800223 mlog_exit(status);
224 return status;
225}
226
227/*
228 * return any unused bits to the bitmap and write out a clean
229 * local_alloc.
230 *
231 * local_alloc_bh is optional. If not passed, we will simply use the
232 * one off osb. If you do pass it however, be warned that it *will* be
233 * returned brelse'd and NULL'd out.*/
234void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
235{
236 int status;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700237 handle_t *handle;
Mark Fashehccd979b2005-12-15 14:31:24 -0800238 struct inode *local_alloc_inode = NULL;
239 struct buffer_head *bh = NULL;
240 struct buffer_head *main_bm_bh = NULL;
241 struct inode *main_bm_inode = NULL;
242 struct ocfs2_dinode *alloc_copy = NULL;
243 struct ocfs2_dinode *alloc = NULL;
244
245 mlog_entry_void();
246
Mark Fasheh9c7af402008-07-28 18:02:53 -0700247 cancel_delayed_work(&osb->la_enable_wq);
248 flush_workqueue(ocfs2_wq);
249
Mark Fashehccd979b2005-12-15 14:31:24 -0800250 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700251 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -0800252
253 local_alloc_inode =
254 ocfs2_get_system_file_inode(osb,
255 LOCAL_ALLOC_SYSTEM_INODE,
256 osb->slot_num);
257 if (!local_alloc_inode) {
258 status = -ENOENT;
259 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700260 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -0800261 }
262
263 osb->local_alloc_state = OCFS2_LA_DISABLED;
264
Mark Fashehccd979b2005-12-15 14:31:24 -0800265 main_bm_inode = ocfs2_get_system_file_inode(osb,
266 GLOBAL_BITMAP_SYSTEM_INODE,
267 OCFS2_INVALID_SLOT);
268 if (!main_bm_inode) {
269 status = -EINVAL;
270 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700271 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -0800272 }
273
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700274 mutex_lock(&main_bm_inode->i_mutex);
275
Mark Fashehe63aecb62007-10-18 15:30:42 -0700276 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -0800277 if (status < 0) {
278 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700279 goto out_mutex;
Mark Fashehccd979b2005-12-15 14:31:24 -0800280 }
281
282 /* WINDOW_MOVE_CREDITS is a bit heavy... */
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700283 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800284 if (IS_ERR(handle)) {
285 mlog_errno(PTR_ERR(handle));
286 handle = NULL;
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700287 goto out_unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -0800288 }
289
290 bh = osb->local_alloc_bh;
291 alloc = (struct ocfs2_dinode *) bh->b_data;
292
Sunil Mushran4ba1c5b2008-04-18 15:03:59 -0700293 alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800294 if (!alloc_copy) {
295 status = -ENOMEM;
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700296 goto out_commit;
Mark Fashehccd979b2005-12-15 14:31:24 -0800297 }
298 memcpy(alloc_copy, alloc, bh->b_size);
299
Joel Becker0cf2f762009-02-12 16:41:25 -0800300 status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
301 bh, OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800302 if (status < 0) {
303 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700304 goto out_commit;
Mark Fashehccd979b2005-12-15 14:31:24 -0800305 }
306
307 ocfs2_clear_local_alloc(alloc);
308
309 status = ocfs2_journal_dirty(handle, bh);
310 if (status < 0) {
311 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700312 goto out_commit;
Mark Fashehccd979b2005-12-15 14:31:24 -0800313 }
314
315 brelse(bh);
316 osb->local_alloc_bh = NULL;
317 osb->local_alloc_state = OCFS2_LA_UNUSED;
318
319 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
320 main_bm_inode, main_bm_bh);
321 if (status < 0)
322 mlog_errno(status);
323
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700324out_commit:
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700325 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800326
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700327out_unlock:
Mark Fasheha81cb882008-10-07 14:25:16 -0700328 brelse(main_bm_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800329
Mark Fashehe63aecb62007-10-18 15:30:42 -0700330 ocfs2_inode_unlock(main_bm_inode, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -0800331
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700332out_mutex:
333 mutex_unlock(&main_bm_inode->i_mutex);
334 iput(main_bm_inode);
335
336out:
Mark Fashehccd979b2005-12-15 14:31:24 -0800337 if (local_alloc_inode)
338 iput(local_alloc_inode);
339
340 if (alloc_copy)
341 kfree(alloc_copy);
342
343 mlog_exit_void();
344}
345
346/*
347 * We want to free the bitmap bits outside of any recovery context as
348 * we'll need a cluster lock to do so, but we must clear the local
349 * alloc before giving up the recovered nodes journal. To solve this,
350 * we kmalloc a copy of the local alloc before it's change for the
351 * caller to process with ocfs2_complete_local_alloc_recovery
352 */
353int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
354 int slot_num,
355 struct ocfs2_dinode **alloc_copy)
356{
357 int status = 0;
358 struct buffer_head *alloc_bh = NULL;
359 struct inode *inode = NULL;
360 struct ocfs2_dinode *alloc;
361
362 mlog_entry("(slot_num = %d)\n", slot_num);
363
364 *alloc_copy = NULL;
365
366 inode = ocfs2_get_system_file_inode(osb,
367 LOCAL_ALLOC_SYSTEM_INODE,
368 slot_num);
369 if (!inode) {
370 status = -EINVAL;
371 mlog_errno(status);
372 goto bail;
373 }
374
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800375 mutex_lock(&inode->i_mutex);
Mark Fashehccd979b2005-12-15 14:31:24 -0800376
Joel Beckerb657c952008-11-13 14:49:11 -0800377 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
378 OCFS2_BH_IGNORE_CACHE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800379 if (status < 0) {
380 mlog_errno(status);
381 goto bail;
382 }
383
384 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
385 if (!(*alloc_copy)) {
386 status = -ENOMEM;
387 goto bail;
388 }
389 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
390
391 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
392 ocfs2_clear_local_alloc(alloc);
393
Joel Becker13723d02008-10-17 19:25:01 -0700394 ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
Joel Becker8cb471e2009-02-10 20:00:41 -0800395 status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
Mark Fashehccd979b2005-12-15 14:31:24 -0800396 if (status < 0)
397 mlog_errno(status);
398
399bail:
400 if ((status < 0) && (*alloc_copy)) {
401 kfree(*alloc_copy);
402 *alloc_copy = NULL;
403 }
404
Mark Fasheha81cb882008-10-07 14:25:16 -0700405 brelse(alloc_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800406
407 if (inode) {
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800408 mutex_unlock(&inode->i_mutex);
Mark Fashehccd979b2005-12-15 14:31:24 -0800409 iput(inode);
410 }
411
412 mlog_exit(status);
413 return status;
414}
415
416/*
417 * Step 2: By now, we've completed the journal recovery, we've stamped
418 * a clean local alloc on disk and dropped the node out of the
419 * recovery map. Dlm locks will no longer stall, so lets clear out the
420 * main bitmap.
421 */
422int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
423 struct ocfs2_dinode *alloc)
424{
425 int status;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700426 handle_t *handle;
Mark Fashehccd979b2005-12-15 14:31:24 -0800427 struct buffer_head *main_bm_bh = NULL;
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700428 struct inode *main_bm_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800429
430 mlog_entry_void();
431
Mark Fashehccd979b2005-12-15 14:31:24 -0800432 main_bm_inode = ocfs2_get_system_file_inode(osb,
433 GLOBAL_BITMAP_SYSTEM_INODE,
434 OCFS2_INVALID_SLOT);
435 if (!main_bm_inode) {
436 status = -EINVAL;
437 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700438 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -0800439 }
440
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700441 mutex_lock(&main_bm_inode->i_mutex);
442
Mark Fashehe63aecb62007-10-18 15:30:42 -0700443 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -0800444 if (status < 0) {
445 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700446 goto out_mutex;
Mark Fashehccd979b2005-12-15 14:31:24 -0800447 }
448
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700449 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800450 if (IS_ERR(handle)) {
451 status = PTR_ERR(handle);
452 handle = NULL;
453 mlog_errno(status);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700454 goto out_unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -0800455 }
456
457 /* we want the bitmap change to be recorded on disk asap */
Mark Fasheh1fabe142006-10-09 18:11:45 -0700458 handle->h_sync = 1;
Mark Fashehccd979b2005-12-15 14:31:24 -0800459
460 status = ocfs2_sync_local_to_main(osb, handle, alloc,
461 main_bm_inode, main_bm_bh);
462 if (status < 0)
463 mlog_errno(status);
464
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700465 ocfs2_commit_trans(osb, handle);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700466
467out_unlock:
Mark Fashehe63aecb62007-10-18 15:30:42 -0700468 ocfs2_inode_unlock(main_bm_inode, 1);
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700469
470out_mutex:
471 mutex_unlock(&main_bm_inode->i_mutex);
Mark Fashehccd979b2005-12-15 14:31:24 -0800472
Mark Fasheha81cb882008-10-07 14:25:16 -0700473 brelse(main_bm_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800474
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700475 iput(main_bm_inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800476
Mark Fasheh8898a5a2006-10-05 15:42:08 -0700477out:
Tao Ma4d0ddb22008-03-05 16:11:46 +0800478 if (!status)
479 ocfs2_init_inode_steal_slot(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800480 mlog_exit(status);
481 return status;
482}
483
Joel Becker1187c962008-09-03 20:03:39 -0700484/* Check to see if the local alloc window is within ac->ac_max_block */
485static int ocfs2_local_alloc_in_range(struct inode *inode,
486 struct ocfs2_alloc_context *ac,
487 u32 bits_wanted)
488{
489 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
490 struct ocfs2_dinode *alloc;
491 struct ocfs2_local_alloc *la;
492 int start;
493 u64 block_off;
494
495 if (!ac->ac_max_block)
496 return 1;
497
498 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
499 la = OCFS2_LOCAL_ALLOC(alloc);
500
501 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
502 if (start == -1) {
503 mlog_errno(-ENOSPC);
504 return 0;
505 }
506
507 /*
508 * Converting (bm_off + start + bits_wanted) to blocks gives us
509 * the blkno just past our actual allocation. This is perfect
510 * to compare with ac_max_block.
511 */
512 block_off = ocfs2_clusters_to_blocks(inode->i_sb,
513 le32_to_cpu(la->la_bm_off) +
514 start + bits_wanted);
515 mlog(0, "Checking %llu against %llu\n",
516 (unsigned long long)block_off,
517 (unsigned long long)ac->ac_max_block);
518 if (block_off > ac->ac_max_block)
519 return 0;
520
521 return 1;
522}
523
Mark Fashehccd979b2005-12-15 14:31:24 -0800524/*
Mark Fasheh9c7af402008-07-28 18:02:53 -0700525 * make sure we've got at least bits_wanted contiguous bits in the
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800526 * local alloc. You lose them when you drop i_mutex.
Mark Fashehccd979b2005-12-15 14:31:24 -0800527 *
528 * We will add ourselves to the transaction passed in, but may start
529 * our own in order to shift windows.
530 */
531int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
Mark Fashehccd979b2005-12-15 14:31:24 -0800532 u32 bits_wanted,
533 struct ocfs2_alloc_context *ac)
534{
535 int status;
536 struct ocfs2_dinode *alloc;
537 struct inode *local_alloc_inode;
538 unsigned int free_bits;
539
540 mlog_entry_void();
541
Mark Fashehccd979b2005-12-15 14:31:24 -0800542 BUG_ON(!ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800543
544 local_alloc_inode =
545 ocfs2_get_system_file_inode(osb,
546 LOCAL_ALLOC_SYSTEM_INODE,
547 osb->slot_num);
548 if (!local_alloc_inode) {
549 status = -ENOENT;
550 mlog_errno(status);
551 goto bail;
552 }
Mark Fashehda5cbf22006-10-06 18:34:35 -0700553
554 mutex_lock(&local_alloc_inode->i_mutex);
555
Mark Fasheh9c7af402008-07-28 18:02:53 -0700556 /*
557 * We must double check state and allocator bits because
558 * another process may have changed them while holding i_mutex.
559 */
560 spin_lock(&osb->osb_lock);
561 if (!ocfs2_la_state_enabled(osb) ||
562 (bits_wanted > osb->local_alloc_bits)) {
563 spin_unlock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800564 status = -ENOSPC;
565 goto bail;
566 }
Mark Fasheh9c7af402008-07-28 18:02:53 -0700567 spin_unlock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800568
569 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
570
Joel Beckere407e392008-06-12 22:35:39 -0700571#ifdef CONFIG_OCFS2_DEBUG_FS
Mark Fashehccd979b2005-12-15 14:31:24 -0800572 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
573 ocfs2_local_alloc_count_bits(alloc)) {
Mark Fashehb06970532006-03-03 10:24:33 -0800574 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
Mark Fashehccd979b2005-12-15 14:31:24 -0800575 "%u free bits, but a count shows %u",
Mark Fashehb06970532006-03-03 10:24:33 -0800576 (unsigned long long)le64_to_cpu(alloc->i_blkno),
Mark Fashehccd979b2005-12-15 14:31:24 -0800577 le32_to_cpu(alloc->id1.bitmap1.i_used),
578 ocfs2_local_alloc_count_bits(alloc));
579 status = -EIO;
580 goto bail;
581 }
Jan Kara5a58c3e2007-11-13 19:59:33 +0100582#endif
Mark Fashehccd979b2005-12-15 14:31:24 -0800583
584 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
585 le32_to_cpu(alloc->id1.bitmap1.i_used);
586 if (bits_wanted > free_bits) {
587 /* uhoh, window change time. */
588 status =
589 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
590 if (status < 0) {
591 if (status != -ENOSPC)
592 mlog_errno(status);
593 goto bail;
594 }
Mark Fasheh9c7af402008-07-28 18:02:53 -0700595
596 /*
597 * Under certain conditions, the window slide code
598 * might have reduced the number of bits available or
599 * disabled the the local alloc entirely. Re-check
600 * here and return -ENOSPC if necessary.
601 */
602 status = -ENOSPC;
603 if (!ocfs2_la_state_enabled(osb))
604 goto bail;
605
606 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
607 le32_to_cpu(alloc->id1.bitmap1.i_used);
608 if (bits_wanted > free_bits)
609 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -0800610 }
611
Joel Becker1187c962008-09-03 20:03:39 -0700612 if (ac->ac_max_block)
613 mlog(0, "Calling in_range for max block %llu\n",
614 (unsigned long long)ac->ac_max_block);
615
616 if (!ocfs2_local_alloc_in_range(local_alloc_inode, ac,
617 bits_wanted)) {
618 /*
619 * The window is outside ac->ac_max_block.
620 * This errno tells the caller to keep localalloc enabled
621 * but to get the allocation from the main bitmap.
622 */
623 status = -EFBIG;
624 goto bail;
625 }
626
Mark Fasheh8fccfc82007-05-09 17:34:26 -0700627 ac->ac_inode = local_alloc_inode;
Tao Maa4a48912008-03-03 17:12:30 +0800628 /* We should never use localalloc from another slot */
629 ac->ac_alloc_slot = osb->slot_num;
Mark Fasheh8fccfc82007-05-09 17:34:26 -0700630 ac->ac_which = OCFS2_AC_USE_LOCAL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800631 get_bh(osb->local_alloc_bh);
632 ac->ac_bh = osb->local_alloc_bh;
Mark Fashehccd979b2005-12-15 14:31:24 -0800633 status = 0;
634bail:
Sunil Mushranbda02332007-09-21 11:41:43 -0700635 if (status < 0 && local_alloc_inode) {
636 mutex_unlock(&local_alloc_inode->i_mutex);
Mark Fasheh8fccfc82007-05-09 17:34:26 -0700637 iput(local_alloc_inode);
Sunil Mushranbda02332007-09-21 11:41:43 -0700638 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800639
Sunil Mushran2fbe8d12007-12-20 14:58:11 -0800640 mlog(0, "bits=%d, slot=%d, ret=%d\n", bits_wanted, osb->slot_num,
641 status);
642
Mark Fashehccd979b2005-12-15 14:31:24 -0800643 mlog_exit(status);
644 return status;
645}
646
647int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
Mark Fasheh1fabe142006-10-09 18:11:45 -0700648 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800649 struct ocfs2_alloc_context *ac,
Mark Fasheh415cb802007-09-16 20:10:16 -0700650 u32 bits_wanted,
Mark Fashehccd979b2005-12-15 14:31:24 -0800651 u32 *bit_off,
652 u32 *num_bits)
653{
654 int status, start;
655 struct inode *local_alloc_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800656 void *bitmap;
657 struct ocfs2_dinode *alloc;
658 struct ocfs2_local_alloc *la;
659
660 mlog_entry_void();
661 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
662
Mark Fashehccd979b2005-12-15 14:31:24 -0800663 local_alloc_inode = ac->ac_inode;
664 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
665 la = OCFS2_LOCAL_ALLOC(alloc);
666
667 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
668 if (start == -1) {
669 /* TODO: Shouldn't we just BUG here? */
670 status = -ENOSPC;
671 mlog_errno(status);
672 goto bail;
673 }
674
675 bitmap = la->la_bitmap;
676 *bit_off = le32_to_cpu(la->la_bm_off) + start;
677 /* local alloc is always contiguous by nature -- we never
678 * delete bits from it! */
679 *num_bits = bits_wanted;
680
Joel Becker0cf2f762009-02-12 16:41:25 -0800681 status = ocfs2_journal_access_di(handle,
682 INODE_CACHE(local_alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -0700683 osb->local_alloc_bh,
684 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800685 if (status < 0) {
686 mlog_errno(status);
687 goto bail;
688 }
689
690 while(bits_wanted--)
691 ocfs2_set_bit(start++, bitmap);
692
Marcin Slusarz0dd32562008-02-13 00:06:18 +0100693 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800694
695 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
696 if (status < 0) {
697 mlog_errno(status);
698 goto bail;
699 }
700
701 status = 0;
702bail:
703 mlog_exit(status);
704 return status;
705}
706
707static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
708{
709 int i;
710 u8 *buffer;
711 u32 count = 0;
712 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
713
714 mlog_entry_void();
715
716 buffer = la->la_bitmap;
717 for (i = 0; i < le16_to_cpu(la->la_size); i++)
718 count += hweight8(buffer[i]);
719
720 mlog_exit(count);
721 return count;
722}
723
724static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
725 struct ocfs2_dinode *alloc,
726 u32 numbits)
727{
728 int numfound, bitoff, left, startoff, lastzero;
729 void *bitmap = NULL;
730
731 mlog_entry("(numbits wanted = %u)\n", numbits);
732
733 if (!alloc->id1.bitmap1.i_total) {
734 mlog(0, "No bits in my window!\n");
735 bitoff = -1;
736 goto bail;
737 }
738
739 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
740
741 numfound = bitoff = startoff = 0;
742 lastzero = -1;
743 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
744 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
745 if (bitoff == left) {
746 /* mlog(0, "bitoff (%d) == left", bitoff); */
747 break;
748 }
749 /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
750 "numfound = %d\n", bitoff, startoff, numfound);*/
751
752 /* Ok, we found a zero bit... is it contig. or do we
753 * start over?*/
754 if (bitoff == startoff) {
755 /* we found a zero */
756 numfound++;
757 startoff++;
758 } else {
759 /* got a zero after some ones */
760 numfound = 1;
761 startoff = bitoff+1;
762 }
763 /* we got everything we needed */
764 if (numfound == numbits) {
765 /* mlog(0, "Found it all!\n"); */
766 break;
767 }
768 }
769
770 mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff,
771 numfound);
772
773 if (numfound == numbits)
774 bitoff = startoff - numfound;
775 else
776 bitoff = -1;
777
778bail:
779 mlog_exit(bitoff);
780 return bitoff;
781}
782
783static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
784{
785 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
786 int i;
787 mlog_entry_void();
788
789 alloc->id1.bitmap1.i_total = 0;
790 alloc->id1.bitmap1.i_used = 0;
791 la->la_bm_off = 0;
792 for(i = 0; i < le16_to_cpu(la->la_size); i++)
793 la->la_bitmap[i] = 0;
794
795 mlog_exit_void();
796}
797
798#if 0
799/* turn this on and uncomment below to aid debugging window shifts. */
800static void ocfs2_verify_zero_bits(unsigned long *bitmap,
801 unsigned int start,
802 unsigned int count)
803{
804 unsigned int tmp = count;
805 while(tmp--) {
806 if (ocfs2_test_bit(start + tmp, bitmap)) {
807 printk("ocfs2_verify_zero_bits: start = %u, count = "
808 "%u\n", start, count);
809 printk("ocfs2_verify_zero_bits: bit %u is set!",
810 start + tmp);
811 BUG();
812 }
813 }
814}
815#endif
816
817/*
818 * sync the local alloc to main bitmap.
819 *
820 * assumes you've already locked the main bitmap -- the bitmap inode
821 * passed is used for caching.
822 */
823static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
Mark Fasheh1fabe142006-10-09 18:11:45 -0700824 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800825 struct ocfs2_dinode *alloc,
826 struct inode *main_bm_inode,
827 struct buffer_head *main_bm_bh)
828{
829 int status = 0;
830 int bit_off, left, count, start;
831 u64 la_start_blk;
832 u64 blkno;
833 void *bitmap;
834 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
835
Jan Kara5a58c3e2007-11-13 19:59:33 +0100836 mlog_entry("total = %u, used = %u\n",
Mark Fashehccd979b2005-12-15 14:31:24 -0800837 le32_to_cpu(alloc->id1.bitmap1.i_total),
Mark Fashehccd979b2005-12-15 14:31:24 -0800838 le32_to_cpu(alloc->id1.bitmap1.i_used));
839
840 if (!alloc->id1.bitmap1.i_total) {
841 mlog(0, "nothing to sync!\n");
842 goto bail;
843 }
844
845 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
846 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
847 mlog(0, "all bits were taken!\n");
848 goto bail;
849 }
850
851 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
852 le32_to_cpu(la->la_bm_off));
853 bitmap = la->la_bitmap;
854 start = count = bit_off = 0;
855 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
856
857 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
858 != -1) {
859 if ((bit_off < left) && (bit_off == start)) {
860 count++;
861 start++;
862 continue;
863 }
864 if (count) {
865 blkno = la_start_blk +
866 ocfs2_clusters_to_blocks(osb->sb,
867 start - count);
868
Mark Fashehb06970532006-03-03 10:24:33 -0800869 mlog(0, "freeing %u bits starting at local alloc bit "
870 "%u (la_start_blk = %llu, blkno = %llu)\n",
871 count, start - count,
872 (unsigned long long)la_start_blk,
873 (unsigned long long)blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800874
875 status = ocfs2_free_clusters(handle, main_bm_inode,
876 main_bm_bh, blkno, count);
877 if (status < 0) {
878 mlog_errno(status);
879 goto bail;
880 }
881 }
882 if (bit_off >= left)
883 break;
884 count = 1;
885 start = bit_off + 1;
886 }
887
888bail:
889 mlog_exit(status);
890 return status;
891}
892
Mark Fasheh9c7af402008-07-28 18:02:53 -0700893enum ocfs2_la_event {
894 OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
895 OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
896 * enough bits theoretically
897 * free, but a contiguous
898 * allocation could not be
899 * found. */
900 OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
901 * enough bits free to satisfy
902 * our request. */
903};
904#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
905/*
906 * Given an event, calculate the size of our next local alloc window.
907 *
908 * This should always be called under i_mutex of the local alloc inode
909 * so that local alloc disabling doesn't race with processes trying to
910 * use the allocator.
911 *
912 * Returns the state which the local alloc was left in. This value can
913 * be ignored by some paths.
914 */
915static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
916 enum ocfs2_la_event event)
917{
918 unsigned int bits;
919 int state;
920
921 spin_lock(&osb->osb_lock);
922 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
923 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
924 goto out_unlock;
925 }
926
927 /*
928 * ENOSPC and fragmentation are treated similarly for now.
929 */
930 if (event == OCFS2_LA_EVENT_ENOSPC ||
931 event == OCFS2_LA_EVENT_FRAGMENTED) {
932 /*
933 * We ran out of contiguous space in the primary
934 * bitmap. Drastically reduce the number of bits used
935 * by local alloc until we have to disable it.
936 */
937 bits = osb->local_alloc_bits >> 1;
938 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
939 /*
940 * By setting state to THROTTLED, we'll keep
941 * the number of local alloc bits used down
942 * until an event occurs which would give us
943 * reason to assume the bitmap situation might
944 * have changed.
945 */
946 osb->local_alloc_state = OCFS2_LA_THROTTLED;
947 osb->local_alloc_bits = bits;
948 } else {
949 osb->local_alloc_state = OCFS2_LA_DISABLED;
950 }
951 queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
952 OCFS2_LA_ENABLE_INTERVAL);
953 goto out_unlock;
954 }
955
956 /*
957 * Don't increase the size of the local alloc window until we
958 * know we might be able to fulfill the request. Otherwise, we
959 * risk bouncing around the global bitmap during periods of
960 * low space.
961 */
962 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
963 osb->local_alloc_bits = osb->local_alloc_default_bits;
964
965out_unlock:
966 state = osb->local_alloc_state;
967 spin_unlock(&osb->osb_lock);
968
969 return state;
970}
971
Mark Fashehccd979b2005-12-15 14:31:24 -0800972static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
Mark Fashehccd979b2005-12-15 14:31:24 -0800973 struct ocfs2_alloc_context **ac,
974 struct inode **bitmap_inode,
975 struct buffer_head **bitmap_bh)
976{
977 int status;
978
Robert P. J. Daycd861282006-12-13 00:34:52 -0800979 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -0800980 if (!(*ac)) {
981 status = -ENOMEM;
982 mlog_errno(status);
983 goto bail;
984 }
985
Mark Fasheh9c7af402008-07-28 18:02:53 -0700986retry_enospc:
Mark Fashehebcee4b2008-07-28 14:55:20 -0700987 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -0800988
989 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
Mark Fasheh9c7af402008-07-28 18:02:53 -0700990 if (status == -ENOSPC) {
991 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
992 OCFS2_LA_DISABLED)
993 goto bail;
994
995 ocfs2_free_ac_resource(*ac);
996 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
997 goto retry_enospc;
998 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800999 if (status < 0) {
Mark Fasheh9c7af402008-07-28 18:02:53 -07001000 mlog_errno(status);
Mark Fashehccd979b2005-12-15 14:31:24 -08001001 goto bail;
1002 }
1003
1004 *bitmap_inode = (*ac)->ac_inode;
1005 igrab(*bitmap_inode);
1006 *bitmap_bh = (*ac)->ac_bh;
1007 get_bh(*bitmap_bh);
1008 status = 0;
1009bail:
1010 if ((status < 0) && *ac) {
1011 ocfs2_free_alloc_context(*ac);
1012 *ac = NULL;
1013 }
1014
1015 mlog_exit(status);
1016 return status;
1017}
1018
1019/*
1020 * pass it the bitmap lock in lock_bh if you have it.
1021 */
1022static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
Mark Fasheh1fabe142006-10-09 18:11:45 -07001023 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -08001024 struct ocfs2_alloc_context *ac)
1025{
1026 int status = 0;
1027 u32 cluster_off, cluster_count;
1028 struct ocfs2_dinode *alloc = NULL;
1029 struct ocfs2_local_alloc *la;
1030
1031 mlog_entry_void();
1032
1033 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1034 la = OCFS2_LOCAL_ALLOC(alloc);
1035
1036 if (alloc->id1.bitmap1.i_total)
1037 mlog(0, "asking me to alloc a new window over a non-empty "
1038 "one\n");
1039
1040 mlog(0, "Allocating %u clusters for a new window.\n",
Mark Fashehebcee4b2008-07-28 14:55:20 -07001041 osb->local_alloc_bits);
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001042
1043 /* Instruct the allocation code to try the most recently used
1044 * cluster group. We'll re-record the group used this pass
1045 * below. */
1046 ac->ac_last_group = osb->la_last_gd;
1047
Mark Fashehccd979b2005-12-15 14:31:24 -08001048 /* we used the generic suballoc reserve function, but we set
1049 * everything up nicely, so there's no reason why we can't use
1050 * the more specific cluster api to claim bits. */
Mark Fashehebcee4b2008-07-28 14:55:20 -07001051 status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits,
Mark Fashehccd979b2005-12-15 14:31:24 -08001052 &cluster_off, &cluster_count);
Mark Fasheh9c7af402008-07-28 18:02:53 -07001053 if (status == -ENOSPC) {
1054retry_enospc:
1055 /*
1056 * Note: We could also try syncing the journal here to
1057 * allow use of any free bits which the current
1058 * transaction can't give us access to. --Mark
1059 */
1060 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1061 OCFS2_LA_DISABLED)
1062 goto bail;
1063
1064 status = ocfs2_claim_clusters(osb, handle, ac,
1065 osb->local_alloc_bits,
1066 &cluster_off,
1067 &cluster_count);
1068 if (status == -ENOSPC)
1069 goto retry_enospc;
1070 /*
1071 * We only shrunk the *minimum* number of in our
1072 * request - it's entirely possible that the allocator
1073 * might give us more than we asked for.
1074 */
1075 if (status == 0) {
1076 spin_lock(&osb->osb_lock);
1077 osb->local_alloc_bits = cluster_count;
1078 spin_unlock(&osb->osb_lock);
1079 }
1080 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001081 if (status < 0) {
1082 if (status != -ENOSPC)
1083 mlog_errno(status);
1084 goto bail;
1085 }
1086
Mark Fasheh883d4ca2006-06-05 16:41:00 -04001087 osb->la_last_gd = ac->ac_last_group;
1088
Mark Fashehccd979b2005-12-15 14:31:24 -08001089 la->la_bm_off = cpu_to_le32(cluster_off);
1090 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1091 /* just in case... In the future when we find space ourselves,
1092 * we don't have to get all contiguous -- but we'll have to
1093 * set all previously used bits in bitmap and update
1094 * la_bits_set before setting the bits in the main bitmap. */
1095 alloc->id1.bitmap1.i_used = 0;
1096 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1097 le16_to_cpu(la->la_size));
1098
1099 mlog(0, "New window allocated:\n");
1100 mlog(0, "window la_bm_off = %u\n",
1101 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
1102 mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total));
1103
1104bail:
1105 mlog_exit(status);
1106 return status;
1107}
1108
1109/* Note that we do *NOT* lock the local alloc inode here as
1110 * it's been locked already for us. */
1111static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1112 struct inode *local_alloc_inode)
1113{
1114 int status = 0;
1115 struct buffer_head *main_bm_bh = NULL;
1116 struct inode *main_bm_inode = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -07001117 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -08001118 struct ocfs2_dinode *alloc;
1119 struct ocfs2_dinode *alloc_copy = NULL;
1120 struct ocfs2_alloc_context *ac = NULL;
1121
1122 mlog_entry_void();
1123
Mark Fasheh9c7af402008-07-28 18:02:53 -07001124 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1125
Mark Fashehccd979b2005-12-15 14:31:24 -08001126 /* This will lock the main bitmap for us. */
1127 status = ocfs2_local_alloc_reserve_for_window(osb,
Mark Fashehccd979b2005-12-15 14:31:24 -08001128 &ac,
1129 &main_bm_inode,
1130 &main_bm_bh);
1131 if (status < 0) {
1132 if (status != -ENOSPC)
1133 mlog_errno(status);
1134 goto bail;
1135 }
1136
Mark Fasheh65eff9c2006-10-09 17:26:22 -07001137 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -08001138 if (IS_ERR(handle)) {
1139 status = PTR_ERR(handle);
1140 handle = NULL;
1141 mlog_errno(status);
1142 goto bail;
1143 }
1144
1145 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1146
1147 /* We want to clear the local alloc before doing anything
1148 * else, so that if we error later during this operation,
1149 * local alloc shutdown won't try to double free main bitmap
1150 * bits. Make a copy so the sync function knows which bits to
1151 * free. */
Sunil Mushran4ba1c5b2008-04-18 15:03:59 -07001152 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
Mark Fashehccd979b2005-12-15 14:31:24 -08001153 if (!alloc_copy) {
1154 status = -ENOMEM;
1155 mlog_errno(status);
1156 goto bail;
1157 }
1158 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1159
Joel Becker0cf2f762009-02-12 16:41:25 -08001160 status = ocfs2_journal_access_di(handle,
1161 INODE_CACHE(local_alloc_inode),
Joel Becker13723d02008-10-17 19:25:01 -07001162 osb->local_alloc_bh,
1163 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001164 if (status < 0) {
1165 mlog_errno(status);
1166 goto bail;
1167 }
1168
1169 ocfs2_clear_local_alloc(alloc);
1170
1171 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1172 if (status < 0) {
1173 mlog_errno(status);
1174 goto bail;
1175 }
1176
1177 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1178 main_bm_inode, main_bm_bh);
1179 if (status < 0) {
1180 mlog_errno(status);
1181 goto bail;
1182 }
1183
1184 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1185 if (status < 0) {
1186 if (status != -ENOSPC)
1187 mlog_errno(status);
1188 goto bail;
1189 }
1190
1191 atomic_inc(&osb->alloc_stats.moves);
1192
1193 status = 0;
1194bail:
1195 if (handle)
Mark Fasheh02dc1af2006-10-09 16:48:10 -07001196 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -08001197
Mark Fasheha81cb882008-10-07 14:25:16 -07001198 brelse(main_bm_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001199
1200 if (main_bm_inode)
1201 iput(main_bm_inode);
1202
1203 if (alloc_copy)
1204 kfree(alloc_copy);
1205
1206 if (ac)
1207 ocfs2_free_alloc_context(ac);
1208
1209 mlog_exit(status);
1210 return status;
1211}
1212