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 #define MLOG_MASK_PREFIX ML_SUPER
31 #include <cluster/masklog.h>
36 #include "extent_map.h"
37 #include "heartbeat.h"
43 #include "buffer_head_io.h"
45 struct ocfs2_slot_info
{
46 struct inode
*si_inode
;
47 unsigned int si_blocks
;
48 struct buffer_head
**si_bh
;
49 unsigned int si_num_slots
;
51 s16 si_global_node_nums
[OCFS2_MAX_SLOTS
];
55 static s16
__ocfs2_node_num_to_slot(struct ocfs2_slot_info
*si
,
57 static void __ocfs2_fill_slot(struct ocfs2_slot_info
*si
,
62 * Post the slot information on disk into our slot_info struct.
63 * Must be protected by osb_lock.
65 static void ocfs2_update_slot_info(struct ocfs2_slot_info
*si
)
70 /* we don't read the slot block here as ocfs2_super_lock
71 * should've made sure we have the most recent copy. */
72 disk_info
= (__le16
*) si
->si_bh
[0]->b_data
;
74 for (i
= 0; i
< si
->si_size
; i
++)
75 si
->si_global_node_nums
[i
] = le16_to_cpu(disk_info
[i
]);
78 int ocfs2_refresh_slot_info(struct ocfs2_super
*osb
)
81 struct ocfs2_slot_info
*si
= osb
->slot_info
;
86 BUG_ON(si
->si_blocks
== 0);
87 BUG_ON(si
->si_bh
== NULL
);
89 mlog(0, "Refreshing slot map, reading %u block(s)\n",
93 * We pass -1 as blocknr because we expect all of si->si_bh to
94 * be !NULL. Thus, ocfs2_read_blocks() will ignore blocknr. If
95 * this is not true, the read of -1 (UINT64_MAX) will fail.
97 ret
= ocfs2_read_blocks(osb
, -1, si
->si_blocks
, si
->si_bh
, 0,
100 spin_lock(&osb
->osb_lock
);
101 ocfs2_update_slot_info(si
);
102 spin_unlock(&osb
->osb_lock
);
108 /* post the our slot info stuff into it's destination bh and write it
110 static int ocfs2_update_disk_slots(struct ocfs2_super
*osb
,
111 struct ocfs2_slot_info
*si
)
114 __le16
*disk_info
= (__le16
*) si
->si_bh
[0]->b_data
;
116 spin_lock(&osb
->osb_lock
);
117 for (i
= 0; i
< si
->si_size
; i
++)
118 disk_info
[i
] = cpu_to_le16(si
->si_global_node_nums
[i
]);
119 spin_unlock(&osb
->osb_lock
);
121 status
= ocfs2_write_block(osb
, si
->si_bh
[0], si
->si_inode
);
129 * Calculate how many bytes are needed by the slot map. Returns
130 * an error if the slot map file is too small.
132 static int ocfs2_slot_map_physical_size(struct ocfs2_super
*osb
,
134 unsigned long long *bytes
)
136 unsigned long long bytes_needed
;
138 bytes_needed
= osb
->max_slots
* sizeof(__le16
);
139 if (bytes_needed
> i_size_read(inode
)) {
141 "Slot map file is too small! (size %llu, needed %llu)\n",
142 i_size_read(inode
), bytes_needed
);
146 *bytes
= bytes_needed
;
150 /* try to find global node in the slot info. Returns
151 * OCFS2_INVALID_SLOT if nothing is found. */
152 static s16
__ocfs2_node_num_to_slot(struct ocfs2_slot_info
*si
,
156 s16 ret
= OCFS2_INVALID_SLOT
;
158 for(i
= 0; i
< si
->si_num_slots
; i
++) {
159 if (global
== si
->si_global_node_nums
[i
]) {
167 static s16
__ocfs2_find_empty_slot(struct ocfs2_slot_info
*si
,
171 s16 ret
= OCFS2_INVALID_SLOT
;
173 if (preferred
>= 0 && preferred
< si
->si_num_slots
) {
174 if (OCFS2_INVALID_SLOT
== si
->si_global_node_nums
[preferred
]) {
180 for(i
= 0; i
< si
->si_num_slots
; i
++) {
181 if (OCFS2_INVALID_SLOT
== si
->si_global_node_nums
[i
]) {
190 int ocfs2_node_num_to_slot(struct ocfs2_super
*osb
, unsigned int node_num
)
193 struct ocfs2_slot_info
*si
= osb
->slot_info
;
195 spin_lock(&osb
->osb_lock
);
196 slot
= __ocfs2_node_num_to_slot(si
, node_num
);
197 spin_unlock(&osb
->osb_lock
);
199 if (slot
== OCFS2_INVALID_SLOT
)
205 int ocfs2_slot_to_node_num_locked(struct ocfs2_super
*osb
, int slot_num
,
206 unsigned int *node_num
)
208 struct ocfs2_slot_info
*si
= osb
->slot_info
;
210 assert_spin_locked(&osb
->osb_lock
);
212 BUG_ON(slot_num
< 0);
213 BUG_ON(slot_num
> osb
->max_slots
);
215 if (si
->si_global_node_nums
[slot_num
] == OCFS2_INVALID_SLOT
)
218 *node_num
= si
->si_global_node_nums
[slot_num
];
222 static void __ocfs2_free_slot_info(struct ocfs2_slot_info
*si
)
232 for (i
= 0; i
< si
->si_blocks
; i
++) {
234 brelse(si
->si_bh
[i
]);
244 static void __ocfs2_fill_slot(struct ocfs2_slot_info
*si
,
248 BUG_ON(slot_num
== OCFS2_INVALID_SLOT
);
249 BUG_ON(slot_num
>= si
->si_num_slots
);
250 BUG_ON((node_num
!= O2NM_INVALID_NODE_NUM
) &&
251 (node_num
>= O2NM_MAX_NODES
));
253 si
->si_global_node_nums
[slot_num
] = node_num
;
256 int ocfs2_clear_slot(struct ocfs2_super
*osb
, s16 slot_num
)
258 struct ocfs2_slot_info
*si
= osb
->slot_info
;
263 spin_lock(&osb
->osb_lock
);
264 __ocfs2_fill_slot(si
, slot_num
, OCFS2_INVALID_SLOT
);
265 spin_unlock(&osb
->osb_lock
);
267 return ocfs2_update_disk_slots(osb
, osb
->slot_info
);
270 static int ocfs2_map_slot_buffers(struct ocfs2_super
*osb
,
271 struct ocfs2_slot_info
*si
)
275 unsigned long long blocks
, bytes
;
277 struct buffer_head
*bh
;
279 status
= ocfs2_slot_map_physical_size(osb
, si
->si_inode
, &bytes
);
283 blocks
= ocfs2_blocks_for_bytes(si
->si_inode
->i_sb
, bytes
);
284 BUG_ON(blocks
> UINT_MAX
);
285 si
->si_blocks
= blocks
;
289 mlog(0, "Slot map needs %u buffers for %llu bytes\n",
290 si
->si_blocks
, bytes
);
292 si
->si_bh
= kzalloc(sizeof(struct buffer_head
*) * si
->si_blocks
,
300 for (i
= 0; i
< si
->si_blocks
; i
++) {
301 status
= ocfs2_extent_map_get_blocks(si
->si_inode
, i
,
308 mlog(0, "Reading slot map block %u at %llu\n", i
,
309 (unsigned long long)blkno
);
311 bh
= NULL
; /* Acquire a fresh bh */
312 status
= ocfs2_read_block(osb
, blkno
, &bh
, 0, si
->si_inode
);
325 int ocfs2_init_slot_info(struct ocfs2_super
*osb
)
328 struct inode
*inode
= NULL
;
329 struct ocfs2_slot_info
*si
;
331 si
= kzalloc(sizeof(struct ocfs2_slot_info
), GFP_KERNEL
);
338 si
->si_num_slots
= osb
->max_slots
;
339 si
->si_size
= OCFS2_MAX_SLOTS
;
341 for(i
= 0; i
< si
->si_num_slots
; i
++)
342 si
->si_global_node_nums
[i
] = OCFS2_INVALID_SLOT
;
344 inode
= ocfs2_get_system_file_inode(osb
, SLOT_MAP_SYSTEM_INODE
,
352 si
->si_inode
= inode
;
353 status
= ocfs2_map_slot_buffers(osb
, si
);
359 osb
->slot_info
= (struct ocfs2_slot_info
*)si
;
361 if (status
< 0 && si
)
362 __ocfs2_free_slot_info(si
);
367 void ocfs2_free_slot_info(struct ocfs2_super
*osb
)
369 struct ocfs2_slot_info
*si
= osb
->slot_info
;
371 osb
->slot_info
= NULL
;
372 __ocfs2_free_slot_info(si
);
375 int ocfs2_find_slot(struct ocfs2_super
*osb
)
379 struct ocfs2_slot_info
*si
;
385 spin_lock(&osb
->osb_lock
);
386 ocfs2_update_slot_info(si
);
388 /* search for ourselves first and take the slot if it already
389 * exists. Perhaps we need to mark this in a variable for our
390 * own journal recovery? Possibly not, though we certainly
391 * need to warn to the user */
392 slot
= __ocfs2_node_num_to_slot(si
, osb
->node_num
);
393 if (slot
== OCFS2_INVALID_SLOT
) {
394 /* if no slot yet, then just take 1st available
396 slot
= __ocfs2_find_empty_slot(si
, osb
->preferred_slot
);
397 if (slot
== OCFS2_INVALID_SLOT
) {
398 spin_unlock(&osb
->osb_lock
);
399 mlog(ML_ERROR
, "no free slots available!\n");
404 mlog(ML_NOTICE
, "slot %d is already allocated to this node!\n",
407 __ocfs2_fill_slot(si
, slot
, osb
->node_num
);
408 osb
->slot_num
= slot
;
409 spin_unlock(&osb
->osb_lock
);
411 mlog(0, "taking node slot %d\n", osb
->slot_num
);
413 status
= ocfs2_update_disk_slots(osb
, si
);
422 void ocfs2_put_slot(struct ocfs2_super
*osb
)
425 struct ocfs2_slot_info
*si
= osb
->slot_info
;
430 spin_lock(&osb
->osb_lock
);
431 ocfs2_update_slot_info(si
);
433 __ocfs2_fill_slot(si
, osb
->slot_num
, OCFS2_INVALID_SLOT
);
434 osb
->slot_num
= OCFS2_INVALID_SLOT
;
435 spin_unlock(&osb
->osb_lock
);
437 status
= ocfs2_update_disk_slots(osb
, si
);
444 ocfs2_free_slot_info(osb
);
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