blob: bdda2d8f85080a5a883c1b01b4cc1fbe68d83d18 [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 * slot_map.c
5 *
6 *
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/types.h>
27#include <linux/slab.h>
28#include <linux/highmem.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080029
30#define MLOG_MASK_PREFIX ML_SUPER
31#include <cluster/masklog.h>
32
33#include "ocfs2.h"
34
35#include "dlmglue.h"
36#include "extent_map.h"
37#include "heartbeat.h"
38#include "inode.h"
39#include "slot_map.h"
40#include "super.h"
41#include "sysfile.h"
42
43#include "buffer_head_io.h"
44
Joel Beckerfc881fa2008-02-01 12:04:48 -080045
46struct ocfs2_slot {
47 int sl_valid;
48 unsigned int sl_node_num;
49};
50
Joel Beckerd85b20e2008-02-01 12:01:05 -080051struct ocfs2_slot_info {
Joel Becker386a2ef2008-02-01 12:06:54 -080052 int si_extended;
53 int si_slots_per_block;
Joel Beckerd85b20e2008-02-01 12:01:05 -080054 struct inode *si_inode;
Joel Becker1c8d9a62008-02-01 11:59:07 -080055 unsigned int si_blocks;
56 struct buffer_head **si_bh;
Joel Beckerd85b20e2008-02-01 12:01:05 -080057 unsigned int si_num_slots;
Joel Beckerfc881fa2008-02-01 12:04:48 -080058 struct ocfs2_slot *si_slots;
Joel Beckerd85b20e2008-02-01 12:01:05 -080059};
60
61
Joel Beckerfc881fa2008-02-01 12:04:48 -080062static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
63 unsigned int node_num);
64
65static void ocfs2_invalidate_slot(struct ocfs2_slot_info *si,
66 int slot_num)
67{
68 BUG_ON((slot_num < 0) || (slot_num >= si->si_num_slots));
69 si->si_slots[slot_num].sl_valid = 0;
70}
71
72static void ocfs2_set_slot(struct ocfs2_slot_info *si,
73 int slot_num, unsigned int node_num)
74{
75 BUG_ON((slot_num < 0) || (slot_num >= si->si_num_slots));
Joel Beckerfc881fa2008-02-01 12:04:48 -080076
77 si->si_slots[slot_num].sl_valid = 1;
78 si->si_slots[slot_num].sl_node_num = node_num;
79}
Mark Fashehccd979b2005-12-15 14:31:24 -080080
Joel Becker386a2ef2008-02-01 12:06:54 -080081/* This version is for the extended slot map */
82static void ocfs2_update_slot_info_extended(struct ocfs2_slot_info *si)
83{
84 int b, i, slotno;
85 struct ocfs2_slot_map_extended *se;
86
87 slotno = 0;
88 for (b = 0; b < si->si_blocks; b++) {
89 se = (struct ocfs2_slot_map_extended *)si->si_bh[b]->b_data;
90 for (i = 0;
91 (i < si->si_slots_per_block) &&
92 (slotno < si->si_num_slots);
93 i++, slotno++) {
94 if (se->se_slots[i].es_valid)
95 ocfs2_set_slot(si, slotno,
96 le32_to_cpu(se->se_slots[i].es_node_num));
97 else
98 ocfs2_invalidate_slot(si, slotno);
99 }
100 }
101}
102
Joel Beckerd85b20e2008-02-01 12:01:05 -0800103/*
104 * Post the slot information on disk into our slot_info struct.
105 * Must be protected by osb_lock.
106 */
Joel Becker386a2ef2008-02-01 12:06:54 -0800107static void ocfs2_update_slot_info_old(struct ocfs2_slot_info *si)
Mark Fashehccd979b2005-12-15 14:31:24 -0800108{
109 int i;
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800110 struct ocfs2_slot_map *sm;
Mark Fashehccd979b2005-12-15 14:31:24 -0800111
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800112 sm = (struct ocfs2_slot_map *)si->si_bh[0]->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800113
Joel Beckerfc881fa2008-02-01 12:04:48 -0800114 for (i = 0; i < si->si_num_slots; i++) {
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800115 if (le16_to_cpu(sm->sm_slots[i]) == (u16)OCFS2_INVALID_SLOT)
Joel Beckerfc881fa2008-02-01 12:04:48 -0800116 ocfs2_invalidate_slot(si, i);
117 else
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800118 ocfs2_set_slot(si, i, le16_to_cpu(sm->sm_slots[i]));
Joel Beckerfc881fa2008-02-01 12:04:48 -0800119 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800120}
121
Joel Becker386a2ef2008-02-01 12:06:54 -0800122static void ocfs2_update_slot_info(struct ocfs2_slot_info *si)
123{
124 /*
125 * The slot data will have been refreshed when ocfs2_super_lock
126 * was taken.
127 */
128 if (si->si_extended)
129 ocfs2_update_slot_info_extended(si);
130 else
131 ocfs2_update_slot_info_old(si);
132}
133
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800134int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
135{
136 int ret;
137 struct ocfs2_slot_info *si = osb->slot_info;
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800138
139 if (si == NULL)
140 return 0;
141
Joel Becker1c8d9a62008-02-01 11:59:07 -0800142 BUG_ON(si->si_blocks == 0);
143 BUG_ON(si->si_bh == NULL);
144
145 mlog(0, "Refreshing slot map, reading %u block(s)\n",
146 si->si_blocks);
147
148 /*
149 * We pass -1 as blocknr because we expect all of si->si_bh to
150 * be !NULL. Thus, ocfs2_read_blocks() will ignore blocknr. If
151 * this is not true, the read of -1 (UINT64_MAX) will fail.
152 */
Joel Beckerd4a8c932008-10-09 17:20:34 -0700153 ret = ocfs2_read_blocks(si->si_inode, -1, si->si_blocks, si->si_bh,
154 OCFS2_BH_IGNORE_CACHE);
Joel Beckerd85b20e2008-02-01 12:01:05 -0800155 if (ret == 0) {
156 spin_lock(&osb->osb_lock);
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800157 ocfs2_update_slot_info(si);
Joel Beckerd85b20e2008-02-01 12:01:05 -0800158 spin_unlock(&osb->osb_lock);
159 }
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800160
161 return ret;
162}
163
Mark Fashehccd979b2005-12-15 14:31:24 -0800164/* post the our slot info stuff into it's destination bh and write it
165 * out. */
Joel Becker386a2ef2008-02-01 12:06:54 -0800166static void ocfs2_update_disk_slot_extended(struct ocfs2_slot_info *si,
167 int slot_num,
168 struct buffer_head **bh)
Mark Fashehccd979b2005-12-15 14:31:24 -0800169{
Joel Becker386a2ef2008-02-01 12:06:54 -0800170 int blkind = slot_num / si->si_slots_per_block;
171 int slotno = slot_num % si->si_slots_per_block;
172 struct ocfs2_slot_map_extended *se;
173
174 BUG_ON(blkind >= si->si_blocks);
175
176 se = (struct ocfs2_slot_map_extended *)si->si_bh[blkind]->b_data;
177 se->se_slots[slotno].es_valid = si->si_slots[slot_num].sl_valid;
178 if (si->si_slots[slot_num].sl_valid)
179 se->se_slots[slotno].es_node_num =
180 cpu_to_le32(si->si_slots[slot_num].sl_node_num);
181 *bh = si->si_bh[blkind];
182}
183
184static void ocfs2_update_disk_slot_old(struct ocfs2_slot_info *si,
185 int slot_num,
186 struct buffer_head **bh)
187{
188 int i;
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800189 struct ocfs2_slot_map *sm;
Mark Fashehccd979b2005-12-15 14:31:24 -0800190
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800191 sm = (struct ocfs2_slot_map *)si->si_bh[0]->b_data;
Joel Beckerfc881fa2008-02-01 12:04:48 -0800192 for (i = 0; i < si->si_num_slots; i++) {
193 if (si->si_slots[i].sl_valid)
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800194 sm->sm_slots[i] =
Joel Beckerfc881fa2008-02-01 12:04:48 -0800195 cpu_to_le16(si->si_slots[i].sl_node_num);
196 else
Joel Beckerfb86b1f2008-02-01 11:59:05 -0800197 sm->sm_slots[i] = cpu_to_le16(OCFS2_INVALID_SLOT);
Joel Beckerfc881fa2008-02-01 12:04:48 -0800198 }
Joel Becker386a2ef2008-02-01 12:06:54 -0800199 *bh = si->si_bh[0];
200}
201
202static int ocfs2_update_disk_slot(struct ocfs2_super *osb,
203 struct ocfs2_slot_info *si,
204 int slot_num)
205{
206 int status;
207 struct buffer_head *bh;
208
209 spin_lock(&osb->osb_lock);
210 if (si->si_extended)
211 ocfs2_update_disk_slot_extended(si, slot_num, &bh);
212 else
213 ocfs2_update_disk_slot_old(si, slot_num, &bh);
Joel Beckerd85b20e2008-02-01 12:01:05 -0800214 spin_unlock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800215
Joel Becker386a2ef2008-02-01 12:06:54 -0800216 status = ocfs2_write_block(osb, bh, si->si_inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800217 if (status < 0)
218 mlog_errno(status);
219
220 return status;
221}
222
Joel Becker1c8d9a62008-02-01 11:59:07 -0800223/*
224 * Calculate how many bytes are needed by the slot map. Returns
225 * an error if the slot map file is too small.
226 */
227static int ocfs2_slot_map_physical_size(struct ocfs2_super *osb,
228 struct inode *inode,
229 unsigned long long *bytes)
230{
231 unsigned long long bytes_needed;
232
Joel Becker386a2ef2008-02-01 12:06:54 -0800233 if (ocfs2_uses_extended_slot_map(osb)) {
234 bytes_needed = osb->max_slots *
235 sizeof(struct ocfs2_extended_slot);
236 } else {
237 bytes_needed = osb->max_slots * sizeof(__le16);
238 }
Joel Becker1c8d9a62008-02-01 11:59:07 -0800239 if (bytes_needed > i_size_read(inode)) {
240 mlog(ML_ERROR,
241 "Slot map file is too small! (size %llu, needed %llu)\n",
242 i_size_read(inode), bytes_needed);
243 return -ENOSPC;
244 }
245
246 *bytes = bytes_needed;
247 return 0;
248}
249
Joel Beckerfc881fa2008-02-01 12:04:48 -0800250/* try to find global node in the slot info. Returns -ENOENT
251 * if nothing is found. */
252static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
253 unsigned int node_num)
Mark Fashehccd979b2005-12-15 14:31:24 -0800254{
Joel Beckerfc881fa2008-02-01 12:04:48 -0800255 int i, ret = -ENOENT;
Mark Fashehccd979b2005-12-15 14:31:24 -0800256
257 for(i = 0; i < si->si_num_slots; i++) {
Joel Beckerfc881fa2008-02-01 12:04:48 -0800258 if (si->si_slots[i].sl_valid &&
259 (node_num == si->si_slots[i].sl_node_num)) {
260 ret = i;
Mark Fashehccd979b2005-12-15 14:31:24 -0800261 break;
262 }
263 }
Joel Beckerfc881fa2008-02-01 12:04:48 -0800264
Mark Fashehccd979b2005-12-15 14:31:24 -0800265 return ret;
266}
267
Joel Beckerfc881fa2008-02-01 12:04:48 -0800268static int __ocfs2_find_empty_slot(struct ocfs2_slot_info *si,
269 int preferred)
Mark Fashehccd979b2005-12-15 14:31:24 -0800270{
Joel Beckerfc881fa2008-02-01 12:04:48 -0800271 int i, ret = -ENOSPC;
Mark Fashehccd979b2005-12-15 14:31:24 -0800272
Joel Beckerfc881fa2008-02-01 12:04:48 -0800273 if ((preferred >= 0) && (preferred < si->si_num_slots)) {
274 if (!si->si_slots[preferred].sl_valid) {
Sunil Mushranbaf46612007-06-18 17:00:24 -0700275 ret = preferred;
276 goto out;
277 }
278 }
279
Mark Fashehccd979b2005-12-15 14:31:24 -0800280 for(i = 0; i < si->si_num_slots; i++) {
Joel Beckerfc881fa2008-02-01 12:04:48 -0800281 if (!si->si_slots[i].sl_valid) {
282 ret = i;
Mark Fashehccd979b2005-12-15 14:31:24 -0800283 break;
284 }
285 }
Sunil Mushranbaf46612007-06-18 17:00:24 -0700286out:
Mark Fashehccd979b2005-12-15 14:31:24 -0800287 return ret;
288}
289
Joel Beckerd85b20e2008-02-01 12:01:05 -0800290int ocfs2_node_num_to_slot(struct ocfs2_super *osb, unsigned int node_num)
Mark Fashehccd979b2005-12-15 14:31:24 -0800291{
Joel Beckerfc881fa2008-02-01 12:04:48 -0800292 int slot;
Joel Beckerd85b20e2008-02-01 12:01:05 -0800293 struct ocfs2_slot_info *si = osb->slot_info;
Mark Fashehccd979b2005-12-15 14:31:24 -0800294
Joel Beckerd85b20e2008-02-01 12:01:05 -0800295 spin_lock(&osb->osb_lock);
296 slot = __ocfs2_node_num_to_slot(si, node_num);
297 spin_unlock(&osb->osb_lock);
298
Joel Beckerd85b20e2008-02-01 12:01:05 -0800299 return slot;
300}
301
302int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
303 unsigned int *node_num)
304{
305 struct ocfs2_slot_info *si = osb->slot_info;
306
307 assert_spin_locked(&osb->osb_lock);
308
309 BUG_ON(slot_num < 0);
310 BUG_ON(slot_num > osb->max_slots);
311
Joel Beckerfc881fa2008-02-01 12:04:48 -0800312 if (!si->si_slots[slot_num].sl_valid)
Joel Beckerd85b20e2008-02-01 12:01:05 -0800313 return -ENOENT;
314
Joel Beckerfc881fa2008-02-01 12:04:48 -0800315 *node_num = si->si_slots[slot_num].sl_node_num;
Joel Beckerd85b20e2008-02-01 12:01:05 -0800316 return 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800317}
318
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800319static void __ocfs2_free_slot_info(struct ocfs2_slot_info *si)
320{
Joel Becker1c8d9a62008-02-01 11:59:07 -0800321 unsigned int i;
322
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800323 if (si == NULL)
324 return;
325
326 if (si->si_inode)
327 iput(si->si_inode);
Joel Becker1c8d9a62008-02-01 11:59:07 -0800328 if (si->si_bh) {
329 for (i = 0; i < si->si_blocks; i++) {
330 if (si->si_bh[i]) {
331 brelse(si->si_bh[i]);
332 si->si_bh[i] = NULL;
333 }
334 }
335 kfree(si->si_bh);
336 }
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800337
338 kfree(si);
339}
340
Joel Beckerfc881fa2008-02-01 12:04:48 -0800341int ocfs2_clear_slot(struct ocfs2_super *osb, int slot_num)
Mark Fashehccd979b2005-12-15 14:31:24 -0800342{
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800343 struct ocfs2_slot_info *si = osb->slot_info;
344
345 if (si == NULL)
346 return 0;
347
Joel Beckerd85b20e2008-02-01 12:01:05 -0800348 spin_lock(&osb->osb_lock);
Joel Beckerfc881fa2008-02-01 12:04:48 -0800349 ocfs2_invalidate_slot(si, slot_num);
Joel Beckerd85b20e2008-02-01 12:01:05 -0800350 spin_unlock(&osb->osb_lock);
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800351
Joel Becker386a2ef2008-02-01 12:06:54 -0800352 return ocfs2_update_disk_slot(osb, osb->slot_info, slot_num);
Mark Fashehccd979b2005-12-15 14:31:24 -0800353}
354
Joel Becker1c8d9a62008-02-01 11:59:07 -0800355static int ocfs2_map_slot_buffers(struct ocfs2_super *osb,
356 struct ocfs2_slot_info *si)
357{
358 int status = 0;
359 u64 blkno;
360 unsigned long long blocks, bytes;
361 unsigned int i;
362 struct buffer_head *bh;
363
364 status = ocfs2_slot_map_physical_size(osb, si->si_inode, &bytes);
365 if (status)
366 goto bail;
367
368 blocks = ocfs2_blocks_for_bytes(si->si_inode->i_sb, bytes);
369 BUG_ON(blocks > UINT_MAX);
370 si->si_blocks = blocks;
371 if (!si->si_blocks)
372 goto bail;
373
Joel Becker386a2ef2008-02-01 12:06:54 -0800374 if (si->si_extended)
375 si->si_slots_per_block =
376 (osb->sb->s_blocksize /
377 sizeof(struct ocfs2_extended_slot));
378 else
379 si->si_slots_per_block = osb->sb->s_blocksize / sizeof(__le16);
380
381 /* The size checks above should ensure this */
382 BUG_ON((osb->max_slots / si->si_slots_per_block) > blocks);
383
Joel Becker1c8d9a62008-02-01 11:59:07 -0800384 mlog(0, "Slot map needs %u buffers for %llu bytes\n",
385 si->si_blocks, bytes);
386
387 si->si_bh = kzalloc(sizeof(struct buffer_head *) * si->si_blocks,
388 GFP_KERNEL);
389 if (!si->si_bh) {
390 status = -ENOMEM;
391 mlog_errno(status);
392 goto bail;
393 }
394
395 for (i = 0; i < si->si_blocks; i++) {
396 status = ocfs2_extent_map_get_blocks(si->si_inode, i,
397 &blkno, NULL, NULL);
398 if (status < 0) {
399 mlog_errno(status);
400 goto bail;
401 }
402
403 mlog(0, "Reading slot map block %u at %llu\n", i,
404 (unsigned long long)blkno);
405
406 bh = NULL; /* Acquire a fresh bh */
Joel Beckerd4a8c932008-10-09 17:20:34 -0700407 status = ocfs2_read_blocks(si->si_inode, blkno, 1, &bh,
408 OCFS2_BH_IGNORE_CACHE);
Joel Becker1c8d9a62008-02-01 11:59:07 -0800409 if (status < 0) {
410 mlog_errno(status);
411 goto bail;
412 }
413
414 si->si_bh[i] = bh;
415 }
416
417bail:
418 return status;
419}
420
Mark Fashehccd979b2005-12-15 14:31:24 -0800421int ocfs2_init_slot_info(struct ocfs2_super *osb)
422{
Joel Beckerfc881fa2008-02-01 12:04:48 -0800423 int status;
Mark Fashehccd979b2005-12-15 14:31:24 -0800424 struct inode *inode = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800425 struct ocfs2_slot_info *si;
426
Joel Beckerfc881fa2008-02-01 12:04:48 -0800427 si = kzalloc(sizeof(struct ocfs2_slot_info) +
428 (sizeof(struct ocfs2_slot) * osb->max_slots),
429 GFP_KERNEL);
Mark Fashehccd979b2005-12-15 14:31:24 -0800430 if (!si) {
431 status = -ENOMEM;
432 mlog_errno(status);
433 goto bail;
434 }
435
Joel Becker386a2ef2008-02-01 12:06:54 -0800436 si->si_extended = ocfs2_uses_extended_slot_map(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800437 si->si_num_slots = osb->max_slots;
Joel Beckerfc881fa2008-02-01 12:04:48 -0800438 si->si_slots = (struct ocfs2_slot *)((char *)si +
439 sizeof(struct ocfs2_slot_info));
Mark Fashehccd979b2005-12-15 14:31:24 -0800440
441 inode = ocfs2_get_system_file_inode(osb, SLOT_MAP_SYSTEM_INODE,
442 OCFS2_INVALID_SLOT);
443 if (!inode) {
444 status = -EINVAL;
445 mlog_errno(status);
446 goto bail;
447 }
448
Mark Fashehccd979b2005-12-15 14:31:24 -0800449 si->si_inode = inode;
Joel Becker1c8d9a62008-02-01 11:59:07 -0800450 status = ocfs2_map_slot_buffers(osb, si);
451 if (status < 0) {
452 mlog_errno(status);
453 goto bail;
454 }
455
Joel Beckerd85b20e2008-02-01 12:01:05 -0800456 osb->slot_info = (struct ocfs2_slot_info *)si;
Mark Fashehccd979b2005-12-15 14:31:24 -0800457bail:
458 if (status < 0 && si)
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800459 __ocfs2_free_slot_info(si);
Mark Fashehccd979b2005-12-15 14:31:24 -0800460
461 return status;
462}
463
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800464void ocfs2_free_slot_info(struct ocfs2_super *osb)
Mark Fashehccd979b2005-12-15 14:31:24 -0800465{
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800466 struct ocfs2_slot_info *si = osb->slot_info;
467
468 osb->slot_info = NULL;
469 __ocfs2_free_slot_info(si);
Mark Fashehccd979b2005-12-15 14:31:24 -0800470}
471
472int ocfs2_find_slot(struct ocfs2_super *osb)
473{
474 int status;
Joel Beckerfc881fa2008-02-01 12:04:48 -0800475 int slot;
Mark Fashehccd979b2005-12-15 14:31:24 -0800476 struct ocfs2_slot_info *si;
477
478 mlog_entry_void();
479
480 si = osb->slot_info;
481
Joel Beckerd85b20e2008-02-01 12:01:05 -0800482 spin_lock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800483 ocfs2_update_slot_info(si);
484
Mark Fashehccd979b2005-12-15 14:31:24 -0800485 /* search for ourselves first and take the slot if it already
486 * exists. Perhaps we need to mark this in a variable for our
487 * own journal recovery? Possibly not, though we certainly
488 * need to warn to the user */
489 slot = __ocfs2_node_num_to_slot(si, osb->node_num);
Joel Beckerfc881fa2008-02-01 12:04:48 -0800490 if (slot < 0) {
Mark Fashehccd979b2005-12-15 14:31:24 -0800491 /* if no slot yet, then just take 1st available
492 * one. */
Sunil Mushranbaf46612007-06-18 17:00:24 -0700493 slot = __ocfs2_find_empty_slot(si, osb->preferred_slot);
Joel Beckerfc881fa2008-02-01 12:04:48 -0800494 if (slot < 0) {
Joel Beckerd85b20e2008-02-01 12:01:05 -0800495 spin_unlock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800496 mlog(ML_ERROR, "no free slots available!\n");
497 status = -EINVAL;
498 goto bail;
499 }
500 } else
501 mlog(ML_NOTICE, "slot %d is already allocated to this node!\n",
502 slot);
503
Joel Beckerfc881fa2008-02-01 12:04:48 -0800504 ocfs2_set_slot(si, slot, osb->node_num);
Mark Fashehccd979b2005-12-15 14:31:24 -0800505 osb->slot_num = slot;
Joel Beckerd85b20e2008-02-01 12:01:05 -0800506 spin_unlock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800507
Mark Fashehe7607ab2006-04-27 17:53:22 -0700508 mlog(0, "taking node slot %d\n", osb->slot_num);
Mark Fashehccd979b2005-12-15 14:31:24 -0800509
Joel Becker386a2ef2008-02-01 12:06:54 -0800510 status = ocfs2_update_disk_slot(osb, si, osb->slot_num);
Mark Fashehccd979b2005-12-15 14:31:24 -0800511 if (status < 0)
512 mlog_errno(status);
513
514bail:
515 mlog_exit(status);
516 return status;
517}
518
519void ocfs2_put_slot(struct ocfs2_super *osb)
520{
Joel Becker386a2ef2008-02-01 12:06:54 -0800521 int status, slot_num;
Mark Fashehccd979b2005-12-15 14:31:24 -0800522 struct ocfs2_slot_info *si = osb->slot_info;
523
524 if (!si)
525 return;
526
Joel Beckerd85b20e2008-02-01 12:01:05 -0800527 spin_lock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800528 ocfs2_update_slot_info(si);
529
Joel Becker386a2ef2008-02-01 12:06:54 -0800530 slot_num = osb->slot_num;
Joel Beckerfc881fa2008-02-01 12:04:48 -0800531 ocfs2_invalidate_slot(si, osb->slot_num);
Mark Fashehccd979b2005-12-15 14:31:24 -0800532 osb->slot_num = OCFS2_INVALID_SLOT;
Joel Beckerd85b20e2008-02-01 12:01:05 -0800533 spin_unlock(&osb->osb_lock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800534
Joel Becker386a2ef2008-02-01 12:06:54 -0800535 status = ocfs2_update_disk_slot(osb, si, slot_num);
Mark Fashehccd979b2005-12-15 14:31:24 -0800536 if (status < 0) {
537 mlog_errno(status);
538 goto bail;
539 }
540
541bail:
Mark Fasheh8e8a4602008-02-01 11:59:09 -0800542 ocfs2_free_slot_info(osb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800543}
544