1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
26 #include <linux/types.h>
27 #include <linux/slab.h>
28 #include <linux/highmem.h>
30 #include <cluster/masklog.h>
35 #include "extent_map.h"
36 #include "heartbeat.h"
41 #include "ocfs2_trace.h"
43 #include "buffer_head_io.h"
48 unsigned int sl_node_num
;
51 struct ocfs2_slot_info
{
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
;
62 static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info
*si
,
63 unsigned int node_num
);
65 static void ocfs2_invalidate_slot(struct ocfs2_slot_info
*si
,
68 BUG_ON((slot_num
< 0) || (slot_num
>= si
->si_num_slots
));
69 si
->si_slots
[slot_num
].sl_valid
= 0;
72 static void ocfs2_set_slot(struct ocfs2_slot_info
*si
,
73 int slot_num
, unsigned int node_num
)
75 BUG_ON((slot_num
< 0) || (slot_num
>= si
->si_num_slots
));
77 si
->si_slots
[slot_num
].sl_valid
= 1;
78 si
->si_slots
[slot_num
].sl_node_num
= node_num
;
81 /* This version is for the extended slot map */
82 static void ocfs2_update_slot_info_extended(struct ocfs2_slot_info
*si
)
85 struct ocfs2_slot_map_extended
*se
;
88 for (b
= 0; b
< si
->si_blocks
; b
++) {
89 se
= (struct ocfs2_slot_map_extended
*)si
->si_bh
[b
]->b_data
;
91 (i
< si
->si_slots_per_block
) &&
92 (slotno
< si
->si_num_slots
);
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
));
98 ocfs2_invalidate_slot(si
, slotno
);
104 * Post the slot information on disk into our slot_info struct.
105 * Must be protected by osb_lock.
107 static void ocfs2_update_slot_info_old(struct ocfs2_slot_info
*si
)
110 struct ocfs2_slot_map
*sm
;
112 sm
= (struct ocfs2_slot_map
*)si
->si_bh
[0]->b_data
;
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
);
118 ocfs2_set_slot(si
, i
, le16_to_cpu(sm
->sm_slots
[i
]));
122 static void ocfs2_update_slot_info(struct ocfs2_slot_info
*si
)
125 * The slot data will have been refreshed when ocfs2_super_lock
129 ocfs2_update_slot_info_extended(si
);
131 ocfs2_update_slot_info_old(si
);
134 int ocfs2_refresh_slot_info(struct ocfs2_super
*osb
)
137 struct ocfs2_slot_info
*si
= osb
->slot_info
;
142 BUG_ON(si
->si_blocks
== 0);
143 BUG_ON(si
->si_bh
== NULL
);
145 trace_ocfs2_refresh_slot_info(si
->si_blocks
);
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.
152 ret
= ocfs2_read_blocks(INODE_CACHE(si
->si_inode
), -1, si
->si_blocks
,
153 si
->si_bh
, OCFS2_BH_IGNORE_CACHE
, NULL
);
155 spin_lock(&osb
->osb_lock
);
156 ocfs2_update_slot_info(si
);
157 spin_unlock(&osb
->osb_lock
);
163 /* post the our slot info stuff into it's destination bh and write it
165 static void ocfs2_update_disk_slot_extended(struct ocfs2_slot_info
*si
,
167 struct buffer_head
**bh
)
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
;
173 BUG_ON(blkind
>= si
->si_blocks
);
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
];
183 static void ocfs2_update_disk_slot_old(struct ocfs2_slot_info
*si
,
185 struct buffer_head
**bh
)
188 struct ocfs2_slot_map
*sm
;
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
)
194 cpu_to_le16(si
->si_slots
[i
].sl_node_num
);
196 sm
->sm_slots
[i
] = cpu_to_le16(OCFS2_INVALID_SLOT
);
201 static int ocfs2_update_disk_slot(struct ocfs2_super
*osb
,
202 struct ocfs2_slot_info
*si
,
206 struct buffer_head
*bh
;
208 spin_lock(&osb
->osb_lock
);
210 ocfs2_update_disk_slot_extended(si
, slot_num
, &bh
);
212 ocfs2_update_disk_slot_old(si
, slot_num
, &bh
);
213 spin_unlock(&osb
->osb_lock
);
215 status
= ocfs2_write_block(osb
, bh
, INODE_CACHE(si
->si_inode
));
223 * Calculate how many bytes are needed by the slot map. Returns
224 * an error if the slot map file is too small.
226 static int ocfs2_slot_map_physical_size(struct ocfs2_super
*osb
,
228 unsigned long long *bytes
)
230 unsigned long long bytes_needed
;
232 if (ocfs2_uses_extended_slot_map(osb
)) {
233 bytes_needed
= osb
->max_slots
*
234 sizeof(struct ocfs2_extended_slot
);
236 bytes_needed
= osb
->max_slots
* sizeof(__le16
);
238 if (bytes_needed
> i_size_read(inode
)) {
240 "Slot map file is too small! (size %llu, needed %llu)\n",
241 i_size_read(inode
), bytes_needed
);
245 *bytes
= bytes_needed
;
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
)
254 int i
, ret
= -ENOENT
;
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
)) {
267 static int __ocfs2_find_empty_slot(struct ocfs2_slot_info
*si
,
270 int i
, ret
= -ENOSPC
;
272 if ((preferred
>= 0) && (preferred
< si
->si_num_slots
)) {
273 if (!si
->si_slots
[preferred
].sl_valid
) {
279 for(i
= 0; i
< si
->si_num_slots
; i
++) {
280 if (!si
->si_slots
[i
].sl_valid
) {
289 int ocfs2_node_num_to_slot(struct ocfs2_super
*osb
, unsigned int node_num
)
292 struct ocfs2_slot_info
*si
= osb
->slot_info
;
294 spin_lock(&osb
->osb_lock
);
295 slot
= __ocfs2_node_num_to_slot(si
, node_num
);
296 spin_unlock(&osb
->osb_lock
);
301 int ocfs2_slot_to_node_num_locked(struct ocfs2_super
*osb
, int slot_num
,
302 unsigned int *node_num
)
304 struct ocfs2_slot_info
*si
= osb
->slot_info
;
306 assert_spin_locked(&osb
->osb_lock
);
308 BUG_ON(slot_num
< 0);
309 BUG_ON(slot_num
>= osb
->max_slots
);
311 if (!si
->si_slots
[slot_num
].sl_valid
)
314 *node_num
= si
->si_slots
[slot_num
].sl_node_num
;
318 static void __ocfs2_free_slot_info(struct ocfs2_slot_info
*si
)
327 for (i
= 0; i
< si
->si_blocks
; i
++) {
329 brelse(si
->si_bh
[i
]);
339 int ocfs2_clear_slot(struct ocfs2_super
*osb
, int slot_num
)
341 struct ocfs2_slot_info
*si
= osb
->slot_info
;
346 spin_lock(&osb
->osb_lock
);
347 ocfs2_invalidate_slot(si
, slot_num
);
348 spin_unlock(&osb
->osb_lock
);
350 return ocfs2_update_disk_slot(osb
, osb
->slot_info
, slot_num
);
353 static int ocfs2_map_slot_buffers(struct ocfs2_super
*osb
,
354 struct ocfs2_slot_info
*si
)
358 unsigned long long blocks
, bytes
= 0;
360 struct buffer_head
*bh
;
362 status
= ocfs2_slot_map_physical_size(osb
, si
->si_inode
, &bytes
);
366 blocks
= ocfs2_blocks_for_bytes(si
->si_inode
->i_sb
, bytes
);
367 BUG_ON(blocks
> UINT_MAX
);
368 si
->si_blocks
= blocks
;
373 si
->si_slots_per_block
=
374 (osb
->sb
->s_blocksize
/
375 sizeof(struct ocfs2_extended_slot
));
377 si
->si_slots_per_block
= osb
->sb
->s_blocksize
/ sizeof(__le16
);
379 /* The size checks above should ensure this */
380 BUG_ON((osb
->max_slots
/ si
->si_slots_per_block
) > blocks
);
382 trace_ocfs2_map_slot_buffers(bytes
, si
->si_blocks
);
384 si
->si_bh
= kcalloc(si
->si_blocks
, sizeof(struct buffer_head
*),
392 for (i
= 0; i
< si
->si_blocks
; i
++) {
393 status
= ocfs2_extent_map_get_blocks(si
->si_inode
, i
,
400 trace_ocfs2_map_slot_buffers_block((unsigned long long)blkno
, i
);
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
);
417 int ocfs2_init_slot_info(struct ocfs2_super
*osb
)
420 struct inode
*inode
= NULL
;
421 struct ocfs2_slot_info
*si
;
423 si
= kzalloc(sizeof(struct ocfs2_slot_info
) +
424 (sizeof(struct ocfs2_slot
) * osb
->max_slots
),
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
));
437 inode
= ocfs2_get_system_file_inode(osb
, SLOT_MAP_SYSTEM_INODE
,
445 si
->si_inode
= inode
;
446 status
= ocfs2_map_slot_buffers(osb
, si
);
452 osb
->slot_info
= (struct ocfs2_slot_info
*)si
;
455 __ocfs2_free_slot_info(si
);
460 void ocfs2_free_slot_info(struct ocfs2_super
*osb
)
462 struct ocfs2_slot_info
*si
= osb
->slot_info
;
464 osb
->slot_info
= NULL
;
465 __ocfs2_free_slot_info(si
);
468 int ocfs2_find_slot(struct ocfs2_super
*osb
)
472 struct ocfs2_slot_info
*si
;
476 spin_lock(&osb
->osb_lock
);
477 ocfs2_update_slot_info(si
);
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
);
485 /* if no slot yet, then just take 1st available
487 slot
= __ocfs2_find_empty_slot(si
, osb
->preferred_slot
);
489 spin_unlock(&osb
->osb_lock
);
490 mlog(ML_ERROR
, "no free slots available!\n");
495 printk(KERN_INFO
"ocfs2: Slot %d on device (%s) was already "
496 "allocated to this node!\n", slot
, osb
->dev_str
);
498 ocfs2_set_slot(si
, slot
, osb
->node_num
);
499 osb
->slot_num
= slot
;
500 spin_unlock(&osb
->osb_lock
);
502 trace_ocfs2_find_slot(osb
->slot_num
);
504 status
= ocfs2_update_disk_slot(osb
, si
, osb
->slot_num
);
508 * if write block failed, invalidate slot to avoid overwrite
509 * slot during dismount in case another node rightly has mounted
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
);
521 void ocfs2_put_slot(struct ocfs2_super
*osb
)
523 int status
, slot_num
;
524 struct ocfs2_slot_info
*si
= osb
->slot_info
;
529 spin_lock(&osb
->osb_lock
);
530 ocfs2_update_slot_info(si
);
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
);
537 status
= ocfs2_update_disk_slot(osb
, si
, slot_num
);
541 ocfs2_free_slot_info(osb
);
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