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1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * ocfs2.h
5 *
6 * Defines macros and structures used in OCFS2
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#ifndef OCFS2_H
27#define OCFS2_H
28
29#include <linux/spinlock.h>
30#include <linux/sched.h>
31#include <linux/wait.h>
32#include <linux/list.h>
33#include <linux/rbtree.h>
34#include <linux/workqueue.h>
35#include <linux/kref.h>
c74ec2f7 36#include <linux/mutex.h>
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37#ifndef CONFIG_OCFS2_COMPAT_JBD
38# include <linux/jbd2.h>
39#else
40# include <linux/jbd.h>
41# include "ocfs2_jbd_compat.h"
42#endif
ccd979bd 43
8f2c9c1b
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44/* For union ocfs2_dlm_lksb */
45#include "stackglue.h"
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46
47#include "ocfs2_fs.h"
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48#include "ocfs2_lockid.h"
49
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50/* Most user visible OCFS2 inodes will have very few pieces of
51 * metadata, but larger files (including bitmaps, etc) must be taken
52 * into account when designing an access scheme. We allow a small
53 * amount of inlined blocks to be stored on an array and grow the
54 * structure into a rb tree when necessary. */
55#define OCFS2_INODE_MAX_CACHE_ARRAY 2
56
57struct ocfs2_caching_info {
58 unsigned int ci_num_cached;
59 union {
60 sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
61 struct rb_root ci_tree;
62 } ci_cache;
63};
64
65/* this limits us to 256 nodes
66 * if we need more, we can do a kmalloc for the map */
67#define OCFS2_NODE_MAP_MAX_NODES 256
68struct ocfs2_node_map {
69 u16 num_nodes;
70 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
71};
72
73enum ocfs2_ast_action {
74 OCFS2_AST_INVALID = 0,
75 OCFS2_AST_ATTACH,
76 OCFS2_AST_CONVERT,
77 OCFS2_AST_DOWNCONVERT,
78};
79
80/* actions for an unlockast function to take. */
81enum ocfs2_unlock_action {
82 OCFS2_UNLOCK_INVALID = 0,
83 OCFS2_UNLOCK_CANCEL_CONVERT,
84 OCFS2_UNLOCK_DROP_LOCK,
85};
86
87/* ocfs2_lock_res->l_flags flags. */
3b5da018 88#define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
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89 * the lvb */
90#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
91 * dlm_lock */
92#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
93 * downconvert*/
94#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
95#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
96#define OCFS2_LOCK_REFRESHING (0x00000020)
97#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
98 * for shutdown paths */
99#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
100 * when to skip queueing
101 * a lock because it's
102 * about to be
103 * dropped. */
104#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
cf8e06f1 105#define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
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106#define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
107 call to dlm_lock. Only
108 exists with BUSY set. */
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109
110struct ocfs2_lock_res_ops;
111
112typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
113
114struct ocfs2_lock_res {
115 void *l_priv;
116 struct ocfs2_lock_res_ops *l_ops;
117 spinlock_t l_lock;
118
119 struct list_head l_blocked_list;
120 struct list_head l_mask_waiters;
121
122 enum ocfs2_lock_type l_type;
123 unsigned long l_flags;
124 char l_name[OCFS2_LOCK_ID_MAX_LEN];
125 int l_level;
126 unsigned int l_ro_holders;
127 unsigned int l_ex_holders;
8f2c9c1b 128 union ocfs2_dlm_lksb l_lksb;
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129
130 /* used from AST/BAST funcs. */
131 enum ocfs2_ast_action l_action;
132 enum ocfs2_unlock_action l_unlock_action;
133 int l_requested;
134 int l_blocking;
de551246 135 unsigned int l_pending_gen;
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136
137 wait_queue_head_t l_event;
138
139 struct list_head l_debug_list;
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140
141#ifdef CONFIG_OCFS2_FS_STATS
142 unsigned long long l_lock_num_prmode; /* PR acquires */
143 unsigned long long l_lock_num_exmode; /* EX acquires */
144 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
145 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
146 unsigned long long l_lock_total_prmode; /* Tot wait for PR */
147 unsigned long long l_lock_total_exmode; /* Tot wait for EX */
148 unsigned int l_lock_max_prmode; /* Max wait for PR */
149 unsigned int l_lock_max_exmode; /* Max wait for EX */
150 unsigned int l_lock_refresh; /* Disk refreshes */
151#endif
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152};
153
154struct ocfs2_dlm_debug {
155 struct kref d_refcnt;
156 struct dentry *d_locking_state;
157 struct list_head d_lockres_tracking;
158};
159
160enum ocfs2_vol_state
161{
162 VOLUME_INIT = 0,
163 VOLUME_MOUNTED,
19ece546 164 VOLUME_MOUNTED_QUOTAS,
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165 VOLUME_DISMOUNTED,
166 VOLUME_DISABLED
167};
168
169struct ocfs2_alloc_stats
170{
171 atomic_t moves;
172 atomic_t local_data;
173 atomic_t bitmap_data;
174 atomic_t bg_allocs;
175 atomic_t bg_extends;
176};
177
178enum ocfs2_local_alloc_state
179{
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180 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
181 * this mountpoint. */
182 OCFS2_LA_ENABLED, /* Local alloc is in use. */
183 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
184 * of bits has been reduced. */
185 OCFS2_LA_DISABLED /* Local alloc has temporarily been
186 * disabled. */
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187};
188
189enum ocfs2_mount_options
190{
191 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
192 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
193 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
194 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
195 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
53fc622b 196 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
cf1d6c76 197 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
12462f1d 198 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */
929fb014 199 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* POSIX access control lists */
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200 OCFS2_MOUNT_USRQUOTA = 1 << 9, /* We support user quotas */
201 OCFS2_MOUNT_GRPQUOTA = 1 << 10, /* We support group quotas */
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202};
203
204#define OCFS2_OSB_SOFT_RO 0x0001
205#define OCFS2_OSB_HARD_RO 0x0002
206#define OCFS2_OSB_ERROR_FS 0x0004
7f1a37e3 207#define OCFS2_DEFAULT_ATIME_QUANTUM 60
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208
209struct ocfs2_journal;
d85b20e4 210struct ocfs2_slot_info;
553abd04 211struct ocfs2_recovery_map;
2205363d 212struct ocfs2_quota_recovery;
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213struct ocfs2_super
214{
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215 struct task_struct *commit_task;
216 struct super_block *sb;
217 struct inode *root_inode;
218 struct inode *sys_root_inode;
219 struct inode *system_inodes[NUM_SYSTEM_INODES];
220
221 struct ocfs2_slot_info *slot_info;
222
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223 u32 *slot_recovery_generations;
224
ccd979bd 225 spinlock_t node_map_lock;
ccd979bd 226
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227 u64 root_blkno;
228 u64 system_dir_blkno;
229 u64 bitmap_blkno;
230 u32 bitmap_cpg;
231 u8 *uuid;
232 char *uuid_str;
cf1d6c76 233 u32 uuid_hash;
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234 u8 *vol_label;
235 u64 first_cluster_group_blkno;
236 u32 fs_generation;
237
238 u32 s_feature_compat;
239 u32 s_feature_incompat;
240 u32 s_feature_ro_compat;
241
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242 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
243 * Could protect more on osb as it's very short lived.
244 */
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245 spinlock_t osb_lock;
246 u32 s_next_generation;
247 unsigned long osb_flags;
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248 s16 s_inode_steal_slot;
249 atomic_t s_num_inodes_stolen;
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250
251 unsigned long s_mount_opt;
7f1a37e3 252 unsigned int s_atime_quantum;
ccd979bd 253
fc881fa0 254 unsigned int max_slots;
19fdb624 255 unsigned int node_num;
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256 int slot_num;
257 int preferred_slot;
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258 int s_sectsize_bits;
259 int s_clustersize;
260 int s_clustersize_bits;
fdd77704 261 unsigned int s_xattr_inline_size;
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262
263 atomic_t vol_state;
c74ec2f7 264 struct mutex recovery_lock;
553abd04 265 struct ocfs2_recovery_map *recovery_map;
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266 struct task_struct *recovery_thread_task;
267 int disable_recovery;
268 wait_queue_head_t checkpoint_event;
269 atomic_t needs_checkpoint;
270 struct ocfs2_journal *journal;
d147b3d6 271 unsigned long osb_commit_interval;
ccd979bd 272
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273 struct delayed_work la_enable_wq;
274
275 /*
276 * Must hold local alloc i_mutex and osb->osb_lock to change
277 * local_alloc_bits. Reads can be done under either lock.
278 */
ebcee4b5 279 unsigned int local_alloc_bits;
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280 unsigned int local_alloc_default_bits;
281
282 enum ocfs2_local_alloc_state local_alloc_state; /* protected
283 * by osb_lock */
284
ccd979bd 285 struct buffer_head *local_alloc_bh;
9c7af40b 286
883d4cae 287 u64 la_last_gd;
ccd979bd 288
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289#ifdef CONFIG_OCFS2_FS_STATS
290 struct dentry *local_alloc_debug;
291 char *local_alloc_debug_buf;
292#endif
293
2205363d 294 /* Next three fields are for local node slot recovery during
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295 * mount. */
296 int dirty;
297 struct ocfs2_dinode *local_alloc_copy;
2205363d 298 struct ocfs2_quota_recovery *quota_rec;
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299
300 struct ocfs2_alloc_stats alloc_stats;
301 char dev_str[20]; /* "major,minor" of the device */
302
b61817e1 303 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
4670c46d 304 struct ocfs2_cluster_connection *cconn;
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305 struct ocfs2_lock_res osb_super_lockres;
306 struct ocfs2_lock_res osb_rename_lockres;
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307 struct ocfs2_dlm_debug *osb_dlm_debug;
308
309 struct dentry *osb_debug_root;
310
311 wait_queue_head_t recovery_event;
312
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313 spinlock_t dc_task_lock;
314 struct task_struct *dc_task;
315 wait_queue_head_t dc_event;
316 unsigned long dc_wake_sequence;
317 unsigned long dc_work_sequence;
ccd979bd 318
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319 /*
320 * Any thread can add locks to the list, but the downconvert
321 * thread is the only one allowed to remove locks. Any change
322 * to this rule requires updating
323 * ocfs2_downconvert_thread_do_work().
324 */
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325 struct list_head blocked_lock_list;
326 unsigned long blocked_lock_count;
327
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328 wait_queue_head_t osb_mount_event;
329
330 /* Truncate log info */
331 struct inode *osb_tl_inode;
332 struct buffer_head *osb_tl_bh;
c4028958 333 struct delayed_work osb_truncate_log_wq;
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334
335 struct ocfs2_node_map osb_recovering_orphan_dirs;
336 unsigned int *osb_orphan_wipes;
337 wait_queue_head_t osb_wipe_event;
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338};
339
340#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
ccd979bd 341
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342/* Useful typedef for passing around journal access functions */
343typedef int (*ocfs2_journal_access_func)(handle_t *handle, struct inode *inode,
344 struct buffer_head *bh, int type);
345
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346static inline int ocfs2_should_order_data(struct inode *inode)
347{
348 if (!S_ISREG(inode->i_mode))
349 return 0;
350 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
351 return 0;
352 return 1;
353}
354
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355static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
356{
357 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
358 return 1;
359 return 0;
360}
361
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362static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
363{
364 /*
365 * Support for sparse files is a pre-requisite
366 */
367 if (!ocfs2_sparse_alloc(osb))
368 return 0;
369
370 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
371 return 1;
372 return 0;
373}
374
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375static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
376{
377 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
378 return 1;
379 return 0;
380}
381
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382static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
383{
384 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
385 return 1;
386 return 0;
387}
388
70ad1ba7
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389static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
390{
391 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
392 return 1;
393 return 0;
394}
395
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396/* set / clear functions because cluster events can make these happen
397 * in parallel so we want the transitions to be atomic. this also
398 * means that any future flags osb_flags must be protected by spinlock
399 * too! */
400static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
401 unsigned long flag)
402{
403 spin_lock(&osb->osb_lock);
404 osb->osb_flags |= flag;
405 spin_unlock(&osb->osb_lock);
406}
407
408static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
409 int hard)
410{
411 spin_lock(&osb->osb_lock);
412 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
413 if (hard)
414 osb->osb_flags |= OCFS2_OSB_HARD_RO;
415 else
416 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
417 spin_unlock(&osb->osb_lock);
418}
419
420static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
421{
422 int ret;
423
424 spin_lock(&osb->osb_lock);
425 ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
426 spin_unlock(&osb->osb_lock);
427
428 return ret;
429}
430
431static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
432{
433 int ret;
434
435 spin_lock(&osb->osb_lock);
436 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
437 spin_unlock(&osb->osb_lock);
438
439 return ret;
440}
441
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442static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
443{
444 return (osb->s_feature_incompat &
445 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK);
446}
447
c271c5c2
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448static inline int ocfs2_mount_local(struct ocfs2_super *osb)
449{
450 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
451}
452
386a2ef8
JB
453static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
454{
455 return (osb->s_feature_incompat &
456 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
457}
458
459
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MF
460#define OCFS2_IS_VALID_DINODE(ptr) \
461 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
462
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463#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
464 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
465
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466#define OCFS2_IS_VALID_GROUP_DESC(ptr) \
467 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
468
ccd979bd 469
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470#define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
471 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
472
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473static inline unsigned long ino_from_blkno(struct super_block *sb,
474 u64 blkno)
475{
476 return (unsigned long)(blkno & (u64)ULONG_MAX);
477}
478
479static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
480 u32 clusters)
481{
482 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
483 sb->s_blocksize_bits;
484
485 return (u64)clusters << c_to_b_bits;
486}
487
488static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
489 u64 blocks)
490{
491 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
492 sb->s_blocksize_bits;
493
494 return (u32)(blocks >> b_to_c_bits);
495}
496
497static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
498 u64 bytes)
499{
500 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
501 unsigned int clusters;
502
503 bytes += OCFS2_SB(sb)->s_clustersize - 1;
504 /* OCFS2 just cannot have enough clusters to overflow this */
505 clusters = (unsigned int)(bytes >> cl_bits);
506
507 return clusters;
508}
509
510static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
511 u64 bytes)
512{
513 bytes += sb->s_blocksize - 1;
514 return bytes >> sb->s_blocksize_bits;
515}
516
517static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
518 u32 clusters)
519{
520 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
521}
522
523static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
524 u64 bytes)
525{
526 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
527 unsigned int clusters;
528
529 clusters = ocfs2_clusters_for_bytes(sb, bytes);
530 return (u64)clusters << cl_bits;
531}
532
533static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
534 u64 bytes)
535{
536 u64 blocks;
537
538 blocks = ocfs2_blocks_for_bytes(sb, bytes);
539 return blocks << sb->s_blocksize_bits;
540}
541
542static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
543{
544 return (unsigned long)((bytes + 511) >> 9);
545}
546
9517bac6
MF
547static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
548 unsigned long pg_index)
549{
550 u32 clusters = pg_index;
551 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
552
553 if (unlikely(PAGE_CACHE_SHIFT > cbits))
554 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
555 else if (PAGE_CACHE_SHIFT < cbits)
556 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
557
558 return clusters;
559}
560
561/*
562 * Find the 1st page index which covers the given clusters.
563 */
7c08d70c 564static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
9517bac6
MF
565 u32 clusters)
566{
567 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
7c08d70c 568 pgoff_t index = clusters;
9517bac6
MF
569
570 if (PAGE_CACHE_SHIFT > cbits) {
7c08d70c 571 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
9517bac6 572 } else if (PAGE_CACHE_SHIFT < cbits) {
7c08d70c 573 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
9517bac6
MF
574 }
575
576 return index;
577}
578
60b11392
MF
579static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
580{
581 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
582 unsigned int pages_per_cluster = 1;
583
584 if (PAGE_CACHE_SHIFT < cbits)
585 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
586
587 return pages_per_cluster;
588}
589
ebcee4b5
MF
590static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
591 unsigned int megs)
592{
593 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
594
595 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
596}
597
4d0ddb2c
TM
598static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
599{
600 spin_lock(&osb->osb_lock);
601 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
602 spin_unlock(&osb->osb_lock);
603 atomic_set(&osb->s_num_inodes_stolen, 0);
604}
605
606static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb,
607 s16 slot)
608{
609 spin_lock(&osb->osb_lock);
610 osb->s_inode_steal_slot = slot;
611 spin_unlock(&osb->osb_lock);
612}
613
614static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
615{
616 s16 slot;
617
618 spin_lock(&osb->osb_lock);
619 slot = osb->s_inode_steal_slot;
620 spin_unlock(&osb->osb_lock);
621
622 return slot;
623}
624
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625#define ocfs2_set_bit ext2_set_bit
626#define ocfs2_clear_bit ext2_clear_bit
627#define ocfs2_test_bit ext2_test_bit
628#define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
70ad1ba7 629#define ocfs2_find_next_bit ext2_find_next_bit
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630#endif /* OCFS2_H */
631