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Linux/fs/ocfs2/slot_map.c

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  1 /* -*- 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>
 29 
 30 #include <cluster/masklog.h>
 31 
 32 #include "ocfs2.h"
 33 
 34 #include "dlmglue.h"
 35 #include "extent_map.h"
 36 #include "heartbeat.h"
 37 #include "inode.h"
 38 #include "slot_map.h"
 39 #include "super.h"
 40 #include "sysfile.h"
 41 #include "ocfs2_trace.h"
 42 
 43 #include "buffer_head_io.h"
 44 
 45 
 46 struct ocfs2_slot {
 47         int sl_valid;
 48         unsigned int sl_node_num;
 49 };
 50 
 51 struct ocfs2_slot_info {
 52         int si_extended;
 53         int si_slots_per_block;
 54         struct inode *si_inode;
 55         unsigned int si_blocks;
 56         struct buffer_head **si_bh;
 57         unsigned int si_num_slots;
 58         struct ocfs2_slot *si_slots;
 59 };
 60 
 61 
 62 static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
 63                                     unsigned int node_num);
 64 
 65 static 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 
 72 static 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));
 76 
 77         si->si_slots[slot_num].sl_valid = 1;
 78         si->si_slots[slot_num].sl_node_num = node_num;
 79 }
 80 
 81 /* This version is for the extended slot map */
 82 static 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 
103 /*
104  * Post the slot information on disk into our slot_info struct.
105  * Must be protected by osb_lock.
106  */
107 static void ocfs2_update_slot_info_old(struct ocfs2_slot_info *si)
108 {
109         int i;
110         struct ocfs2_slot_map *sm;
111 
112         sm = (struct ocfs2_slot_map *)si->si_bh[0]->b_data;
113 
114         for (i = 0; i < si->si_num_slots; i++) {
115                 if (le16_to_cpu(sm->sm_slots[i]) == (u16)OCFS2_INVALID_SLOT)
116                         ocfs2_invalidate_slot(si, i);
117                 else
118                         ocfs2_set_slot(si, i, le16_to_cpu(sm->sm_slots[i]));
119         }
120 }
121 
122 static 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 
134 int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
135 {
136         int ret;
137         struct ocfs2_slot_info *si = osb->slot_info;
138 
139         if (si == NULL)
140                 return 0;
141 
142         BUG_ON(si->si_blocks == 0);
143         BUG_ON(si->si_bh == NULL);
144 
145         trace_ocfs2_refresh_slot_info(si->si_blocks);
146 
147         /*
148          * We pass -1 as blocknr because we expect all of si->si_bh to
149          * be !NULL.  Thus, ocfs2_read_blocks() will ignore blocknr.  If
150          * this is not true, the read of -1 (UINT64_MAX) will fail.
151          */
152         ret = ocfs2_read_blocks(INODE_CACHE(si->si_inode), -1, si->si_blocks,
153                                 si->si_bh, OCFS2_BH_IGNORE_CACHE, NULL);
154         if (ret == 0) {
155                 spin_lock(&osb->osb_lock);
156                 ocfs2_update_slot_info(si);
157                 spin_unlock(&osb->osb_lock);
158         }
159 
160         return ret;
161 }
162 
163 /* post the our slot info stuff into it's destination bh and write it
164  * out. */
165 static void ocfs2_update_disk_slot_extended(struct ocfs2_slot_info *si,
166                                             int slot_num,
167                                             struct buffer_head **bh)
168 {
169         int blkind = slot_num / si->si_slots_per_block;
170         int slotno = slot_num % si->si_slots_per_block;
171         struct ocfs2_slot_map_extended *se;
172 
173         BUG_ON(blkind >= si->si_blocks);
174 
175         se = (struct ocfs2_slot_map_extended *)si->si_bh[blkind]->b_data;
176         se->se_slots[slotno].es_valid = si->si_slots[slot_num].sl_valid;
177         if (si->si_slots[slot_num].sl_valid)
178                 se->se_slots[slotno].es_node_num =
179                         cpu_to_le32(si->si_slots[slot_num].sl_node_num);
180         *bh = si->si_bh[blkind];
181 }
182 
183 static void ocfs2_update_disk_slot_old(struct ocfs2_slot_info *si,
184                                        int slot_num,
185                                        struct buffer_head **bh)
186 {
187         int i;
188         struct ocfs2_slot_map *sm;
189 
190         sm = (struct ocfs2_slot_map *)si->si_bh[0]->b_data;
191         for (i = 0; i < si->si_num_slots; i++) {
192                 if (si->si_slots[i].sl_valid)
193                         sm->sm_slots[i] =
194                                 cpu_to_le16(si->si_slots[i].sl_node_num);
195                 else
196                         sm->sm_slots[i] = cpu_to_le16(OCFS2_INVALID_SLOT);
197         }
198         *bh = si->si_bh[0];
199 }
200 
201 static int ocfs2_update_disk_slot(struct ocfs2_super *osb,
202                                   struct ocfs2_slot_info *si,
203                                   int slot_num)
204 {
205         int status;
206         struct buffer_head *bh;
207 
208         spin_lock(&osb->osb_lock);
209         if (si->si_extended)
210                 ocfs2_update_disk_slot_extended(si, slot_num, &bh);
211         else
212                 ocfs2_update_disk_slot_old(si, slot_num, &bh);
213         spin_unlock(&osb->osb_lock);
214 
215         status = ocfs2_write_block(osb, bh, INODE_CACHE(si->si_inode));
216         if (status < 0)
217                 mlog_errno(status);
218 
219         return status;
220 }
221 
222 /*
223  * Calculate how many bytes are needed by the slot map.  Returns
224  * an error if the slot map file is too small.
225  */
226 static int ocfs2_slot_map_physical_size(struct ocfs2_super *osb,
227                                         struct inode *inode,
228                                         unsigned long long *bytes)
229 {
230         unsigned long long bytes_needed;
231 
232         if (ocfs2_uses_extended_slot_map(osb)) {
233                 bytes_needed = osb->max_slots *
234                         sizeof(struct ocfs2_extended_slot);
235         } else {
236                 bytes_needed = osb->max_slots * sizeof(__le16);
237         }
238         if (bytes_needed > i_size_read(inode)) {
239                 mlog(ML_ERROR,
240                      "Slot map file is too small!  (size %llu, needed %llu)\n",
241                      i_size_read(inode), bytes_needed);
242                 return -ENOSPC;
243         }
244 
245         *bytes = bytes_needed;
246         return 0;
247 }
248 
249 /* try to find global node in the slot info. Returns -ENOENT
250  * if nothing is found. */
251 static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
252                                     unsigned int node_num)
253 {
254         int i, ret = -ENOENT;
255 
256         for(i = 0; i < si->si_num_slots; i++) {
257                 if (si->si_slots[i].sl_valid &&
258                     (node_num == si->si_slots[i].sl_node_num)) {
259                         ret = i;
260                         break;
261                 }
262         }
263 
264         return ret;
265 }
266 
267 static int __ocfs2_find_empty_slot(struct ocfs2_slot_info *si,
268                                    int preferred)
269 {
270         int i, ret = -ENOSPC;
271 
272         if ((preferred >= 0) && (preferred < si->si_num_slots)) {
273                 if (!si->si_slots[preferred].sl_valid) {
274                         ret = preferred;
275                         goto out;
276                 }
277         }
278 
279         for(i = 0; i < si->si_num_slots; i++) {
280                 if (!si->si_slots[i].sl_valid) {
281                         ret = i;
282                         break;
283                 }
284         }
285 out:
286         return ret;
287 }
288 
289 int ocfs2_node_num_to_slot(struct ocfs2_super *osb, unsigned int node_num)
290 {
291         int slot;
292         struct ocfs2_slot_info *si = osb->slot_info;
293 
294         spin_lock(&osb->osb_lock);
295         slot = __ocfs2_node_num_to_slot(si, node_num);
296         spin_unlock(&osb->osb_lock);
297 
298         return slot;
299 }
300 
301 int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
302                                   unsigned int *node_num)
303 {
304         struct ocfs2_slot_info *si = osb->slot_info;
305 
306         assert_spin_locked(&osb->osb_lock);
307 
308         BUG_ON(slot_num < 0);
309         BUG_ON(slot_num >= osb->max_slots);
310 
311         if (!si->si_slots[slot_num].sl_valid)
312                 return -ENOENT;
313 
314         *node_num = si->si_slots[slot_num].sl_node_num;
315         return 0;
316 }
317 
318 static void __ocfs2_free_slot_info(struct ocfs2_slot_info *si)
319 {
320         unsigned int i;
321 
322         if (si == NULL)
323                 return;
324 
325         iput(si->si_inode);
326         if (si->si_bh) {
327                 for (i = 0; i < si->si_blocks; i++) {
328                         if (si->si_bh[i]) {
329                                 brelse(si->si_bh[i]);
330                                 si->si_bh[i] = NULL;
331                         }
332                 }
333                 kfree(si->si_bh);
334         }
335 
336         kfree(si);
337 }
338 
339 int ocfs2_clear_slot(struct ocfs2_super *osb, int slot_num)
340 {
341         struct ocfs2_slot_info *si = osb->slot_info;
342 
343         if (si == NULL)
344                 return 0;
345 
346         spin_lock(&osb->osb_lock);
347         ocfs2_invalidate_slot(si, slot_num);
348         spin_unlock(&osb->osb_lock);
349 
350         return ocfs2_update_disk_slot(osb, osb->slot_info, slot_num);
351 }
352 
353 static int ocfs2_map_slot_buffers(struct ocfs2_super *osb,
354                                   struct ocfs2_slot_info *si)
355 {
356         int status = 0;
357         u64 blkno;
358         unsigned long long blocks, bytes = 0;
359         unsigned int i;
360         struct buffer_head *bh;
361 
362         status = ocfs2_slot_map_physical_size(osb, si->si_inode, &bytes);
363         if (status)
364                 goto bail;
365 
366         blocks = ocfs2_blocks_for_bytes(si->si_inode->i_sb, bytes);
367         BUG_ON(blocks > UINT_MAX);
368         si->si_blocks = blocks;
369         if (!si->si_blocks)
370                 goto bail;
371 
372         if (si->si_extended)
373                 si->si_slots_per_block =
374                         (osb->sb->s_blocksize /
375                          sizeof(struct ocfs2_extended_slot));
376         else
377                 si->si_slots_per_block = osb->sb->s_blocksize / sizeof(__le16);
378 
379         /* The size checks above should ensure this */
380         BUG_ON((osb->max_slots / si->si_slots_per_block) > blocks);
381 
382         trace_ocfs2_map_slot_buffers(bytes, si->si_blocks);
383 
384         si->si_bh = kcalloc(si->si_blocks, sizeof(struct buffer_head *),
385                             GFP_KERNEL);
386         if (!si->si_bh) {
387                 status = -ENOMEM;
388                 mlog_errno(status);
389                 goto bail;
390         }
391 
392         for (i = 0; i < si->si_blocks; i++) {
393                 status = ocfs2_extent_map_get_blocks(si->si_inode, i,
394                                                      &blkno, NULL, NULL);
395                 if (status < 0) {
396                         mlog_errno(status);
397                         goto bail;
398                 }
399 
400                 trace_ocfs2_map_slot_buffers_block((unsigned long long)blkno, i);
401 
402                 bh = NULL;  /* Acquire a fresh bh */
403                 status = ocfs2_read_blocks(INODE_CACHE(si->si_inode), blkno,
404                                            1, &bh, OCFS2_BH_IGNORE_CACHE, NULL);
405                 if (status < 0) {
406                         mlog_errno(status);
407                         goto bail;
408                 }
409 
410                 si->si_bh[i] = bh;
411         }
412 
413 bail:
414         return status;
415 }
416 
417 int ocfs2_init_slot_info(struct ocfs2_super *osb)
418 {
419         int status;
420         struct inode *inode = NULL;
421         struct ocfs2_slot_info *si;
422 
423         si = kzalloc(sizeof(struct ocfs2_slot_info) +
424                      (sizeof(struct ocfs2_slot) * osb->max_slots),
425                      GFP_KERNEL);
426         if (!si) {
427                 status = -ENOMEM;
428                 mlog_errno(status);
429                 return status;
430         }
431 
432         si->si_extended = ocfs2_uses_extended_slot_map(osb);
433         si->si_num_slots = osb->max_slots;
434         si->si_slots = (struct ocfs2_slot *)((char *)si +
435                                              sizeof(struct ocfs2_slot_info));
436 
437         inode = ocfs2_get_system_file_inode(osb, SLOT_MAP_SYSTEM_INODE,
438                                             OCFS2_INVALID_SLOT);
439         if (!inode) {
440                 status = -EINVAL;
441                 mlog_errno(status);
442                 goto bail;
443         }
444 
445         si->si_inode = inode;
446         status = ocfs2_map_slot_buffers(osb, si);
447         if (status < 0) {
448                 mlog_errno(status);
449                 goto bail;
450         }
451 
452         osb->slot_info = (struct ocfs2_slot_info *)si;
453 bail:
454         if (status < 0)
455                 __ocfs2_free_slot_info(si);
456 
457         return status;
458 }
459 
460 void ocfs2_free_slot_info(struct ocfs2_super *osb)
461 {
462         struct ocfs2_slot_info *si = osb->slot_info;
463 
464         osb->slot_info = NULL;
465         __ocfs2_free_slot_info(si);
466 }
467 
468 int ocfs2_find_slot(struct ocfs2_super *osb)
469 {
470         int status;
471         int slot;
472         struct ocfs2_slot_info *si;
473 
474         si = osb->slot_info;
475 
476         spin_lock(&osb->osb_lock);
477         ocfs2_update_slot_info(si);
478 
479         /* search for ourselves first and take the slot if it already
480          * exists. Perhaps we need to mark this in a variable for our
481          * own journal recovery? Possibly not, though we certainly
482          * need to warn to the user */
483         slot = __ocfs2_node_num_to_slot(si, osb->node_num);
484         if (slot < 0) {
485                 /* if no slot yet, then just take 1st available
486                  * one. */
487                 slot = __ocfs2_find_empty_slot(si, osb->preferred_slot);
488                 if (slot < 0) {
489                         spin_unlock(&osb->osb_lock);
490                         mlog(ML_ERROR, "no free slots available!\n");
491                         status = -EINVAL;
492                         goto bail;
493                 }
494         } else
495                 printk(KERN_INFO "ocfs2: Slot %d on device (%s) was already "
496                        "allocated to this node!\n", slot, osb->dev_str);
497 
498         ocfs2_set_slot(si, slot, osb->node_num);
499         osb->slot_num = slot;
500         spin_unlock(&osb->osb_lock);
501 
502         trace_ocfs2_find_slot(osb->slot_num);
503 
504         status = ocfs2_update_disk_slot(osb, si, osb->slot_num);
505         if (status < 0) {
506                 mlog_errno(status);
507                 /*
508                  * if write block failed, invalidate slot to avoid overwrite
509                  * slot during dismount in case another node rightly has mounted
510                  */
511                 spin_lock(&osb->osb_lock);
512                 ocfs2_invalidate_slot(si, osb->slot_num);
513                 osb->slot_num = OCFS2_INVALID_SLOT;
514                 spin_unlock(&osb->osb_lock);
515         }
516 
517 bail:
518         return status;
519 }
520 
521 void ocfs2_put_slot(struct ocfs2_super *osb)
522 {
523         int status, slot_num;
524         struct ocfs2_slot_info *si = osb->slot_info;
525 
526         if (!si)
527                 return;
528 
529         spin_lock(&osb->osb_lock);
530         ocfs2_update_slot_info(si);
531 
532         slot_num = osb->slot_num;
533         ocfs2_invalidate_slot(si, osb->slot_num);
534         osb->slot_num = OCFS2_INVALID_SLOT;
535         spin_unlock(&osb->osb_lock);
536 
537         status = ocfs2_update_disk_slot(osb, si, slot_num);
538         if (status < 0)
539                 mlog_errno(status);
540 
541         ocfs2_free_slot_info(osb);
542 }
543 

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