ReactOS  0.4.13-dev-563-g0561610
jbd.h
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1 /*
2  * linux/include/linux/jbd.h
3  *
4  * Written by Stephen C. Tweedie <sct@redhat.com>
5  *
6  * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
7  *
8  * This file is part of the Linux kernel and is made available under
9  * the terms of the GNU General Public License, version 2, or at your
10  * option, any later version, incorporated herein by reference.
11  *
12  * Definitions for transaction data structures for the buffer cache
13  * filesystem journaling support.
14  */
15 
16 #ifndef _LINUX_JBD_H
17 #define _LINUX_JBD_H
18 
19 /* Allow this file to be included directly into e2fsprogs */
20 #ifndef __KERNEL__
21 #include "jfs_compat.h"
22 #define JFS_DEBUG
23 #define jfs_debug jbd_debug
24 #else
25 
26 #include <linux/module.h>
27 #include <linux/buffer_head.h>
28 #include <linux/journal-head.h>
29 #include <linux/stddef.h>
30 #include <linux/bit_spinlock.h>
31 #include <linux/mutex.h>
32 #include <linux/timer.h>
33 #include <linux/lockdep.h>
34 
35 #include <asm/semaphore.h>
36 
37 #define journal_oom_retry 1
38 
39 #define jbdlock_t FAST_MUTEX
40 
41 static inline void jbd_lock_init(jbdlock_t *lock)
42 {
44 }
45 
46 static inline void jbd_lock(jbdlock_t *lock)
47 {
49 }
50 
51 static inline void jbd_unlock(jbdlock_t *lock)
52 {
54 }
55 
56 static inline int assert_jbd_locked(jbdlock_t *lock)
57 {
58  int rc = 1;
59 
62  rc = 0;
63  }
64 
65  return rc;
66 }
67 
68 
69 /*
70  * Define JBD_PARANIOD_IOFAIL to cause a kernel BUG() if ext3 finds
71  * certain classes of error which can occur due to failed IOs. Under
72  * normal use we want ext3 to continue after such errors, because
73  * hardware _can_ fail, but for debugging purposes when running tests on
74  * known-good hardware we may want to trap these errors.
75  */
76 #undef JBD_PARANOID_IOFAIL
77 
78 /*
79  * The default maximum commit age, in seconds.
80  */
81 #define JBD_DEFAULT_MAX_COMMIT_AGE 5
82 
83 #ifdef CONFIG_JBD_DEBUG
84 /*
85  * Define JBD_EXPENSIVE_CHECKING to enable more expensive internal
86  * consistency checks. By default we don't do this unless
87  * CONFIG_JBD_DEBUG is on.
88  */
89 #define JBD_EXPENSIVE_CHECKING
90 extern u8 journal_enable_debug;
91 
92 #define jbd_debug(n, f, a...) \
93  do { \
94  if ((n) <= journal_enable_debug) { \
95  printk (KERN_DEBUG "(%s, %d): %s: ", \
96  __FILE__, __LINE__, __FUNCTION__); \
97  printk (f, ## a); \
98  } \
99  } while (0)
100 #else
101 #define jbd_debug
102 #endif
103 
104 static inline void *jbd_alloc(size_t size, gfp_t flags)
105 {
106  return kmalloc(size, flags);
107  /*__get_free_pages(flags, get_order(size));*/
108 }
109 
110 static inline void jbd_free(void *ptr, size_t size)
111 {
112  if (ptr) {
113  kfree(ptr);
114  }
115  /* free_pages((unsigned long)ptr, get_order(size)); */
116 };
117 
118 #define JFS_MIN_JOURNAL_BLOCKS 1024
119 
120 
138 typedef struct handle_s handle_t; /* Atomic operation type */
139 
140 
152 typedef struct journal_s journal_t; /* Journal control structure */
153 #endif
154 
155 /*
156  * Internal structures used by the logging mechanism:
157  */
158 
159 #define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
160 
161 /*
162  * On-disk structures
163  */
164 
165 /*
166  * Descriptor block types:
167  */
168 
169 #define JFS_DESCRIPTOR_BLOCK 1
170 #define JFS_COMMIT_BLOCK 2
171 #define JFS_SUPERBLOCK_V1 3
172 #define JFS_SUPERBLOCK_V2 4
173 #define JFS_REVOKE_BLOCK 5
174 
175 /*
176  * Standard header for all descriptor blocks:
177  */
178 typedef struct journal_header_s
179 {
184 
185 
186 /*
187  * The block tag: used to describe a single buffer in the journal
188  */
189 typedef struct journal_block_tag_s
190 {
191  __be32 t_blocknr; /* The on-disk block number */
192  __be32 t_flags; /* See below */
194 
195 /*
196  * The revoke descriptor: used on disk to describe a series of blocks to
197  * be revoked from the log
198  */
200 {
202  __be32 r_count; /* Count of bytes used in the block */
204 
205 
206 /* Definitions for the journal tag flags word: */
207 #define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */
208 #define JFS_FLAG_SAME_UUID 2 /* block has same uuid as previous */
209 #define JFS_FLAG_DELETED 4 /* block deleted by this transaction */
210 #define JFS_FLAG_LAST_TAG 8 /* last tag in this descriptor block */
211 
212 
213 /*
214  * The journal superblock. All fields are in big-endian byte order.
215  */
216 typedef struct journal_superblock_s
217 {
218  /* 0x0000 */
220 
221  /* 0x000C */
222  /* Static information describing the journal */
223  __be32 s_blocksize; /* journal device blocksize */
224  __be32 s_maxlen; /* total blocks in journal file */
225  __be32 s_first; /* first block of log information */
226 
227  /* 0x0018 */
228  /* Dynamic information describing the current state of the log */
229  __be32 s_sequence; /* first commit ID expected in log */
230  __be32 s_start; /* blocknr of start of log */
231 
232  /* 0x0020 */
233  /* Error value, as set by journal_abort(). */
235 
236  /* 0x0024 */
237  /* Remaining fields are only valid in a version-2 superblock */
238  __be32 s_feature_compat; /* compatible feature set */
239  __be32 s_feature_incompat; /* incompatible feature set */
240  __be32 s_feature_ro_compat; /* readonly-compatible feature set */
241  /* 0x0030 */
242  __u8 s_uuid[16]; /* 128-bit uuid for journal */
243 
244  /* 0x0040 */
245  __be32 s_nr_users; /* Nr of filesystems sharing log */
246 
247  __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
248 
249  /* 0x0048 */
250  __be32 s_max_transaction; /* Limit of journal blocks per trans.*/
251  __be32 s_max_trans_data; /* Limit of data blocks per trans. */
252 
253  /* 0x0050 */
255 
256  /* 0x0100 */
257  __u8 s_users[16*48]; /* ids of all fs'es sharing the log */
258  /* 0x0400 */
260 
261 #define JFS_HAS_COMPAT_FEATURE(j,mask) \
262  ((j)->j_format_version >= 2 && \
263  ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
264 #define JFS_HAS_RO_COMPAT_FEATURE(j,mask) \
265  ((j)->j_format_version >= 2 && \
266  ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
267 #define JFS_HAS_INCOMPAT_FEATURE(j,mask) \
268  ((j)->j_format_version >= 2 && \
269  ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
270 
271 #define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001
272 
273 /* Features known to this kernel version: */
274 #define JFS_KNOWN_COMPAT_FEATURES 0
275 #define JFS_KNOWN_ROCOMPAT_FEATURES 0
276 #define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE
277 
278 #ifdef __KERNEL__
279 
280 #include <linux/fs.h>
281 #include <linux/sched.h>
282 
283 #define J_ASSERT ASSERT
284 
285 #if defined(CONFIG_BUFFER_DEBUG)
286 void buffer_assertion_failure(struct buffer_head *bh);
287 #define J_ASSERT_BH(bh, expr) \
288  do { \
289  if (!(expr)) \
290  buffer_assertion_failure(bh); \
291  J_ASSERT(expr); \
292  } while (0)
293 #define J_ASSERT_JH(jh, expr) J_ASSERT_BH(jh2bh(jh), expr)
294 #else
295 #define J_ASSERT_BH(bh, expr) J_ASSERT(expr)
296 #define J_ASSERT_JH(jh, expr) J_ASSERT(expr)
297 #endif
298 
299 #if defined(JBD_PARANOID_IOFAIL)
300 #define J_EXPECT(expr, why...) J_ASSERT(expr)
301 #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr)
302 #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr)
303 #else
304 #if 0
305 #define __journal_expect(expr, why...) \
306  ({ \
307  int val = (expr); \
308  if (!val) { \
309  printk(KERN_ERR \
310  "EXT3-fs unexpected failure: %s;\n",# expr); \
311  printk(KERN_ERR why "\n"); \
312  } \
313  val; \
314  })
315 #define J_EXPECT(expr, why...) __journal_expect(expr, ## why)
316 #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why)
317 #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why)
318 #endif
319 #define __journal_expect
320 
321 #define J_EXPECT
322 #define J_EXPECT_BH
323 #define J_EXPECT_JH
324 
325 #endif
326 
327 enum jbd_state_bits {
328  BH_JBD /* Has an attached ext3 journal_head */
329  = BH_PrivateStart,
330  BH_JWrite, /* Being written to log (@@@ DEBUGGING) */
331  BH_Freed, /* Has been freed (truncated) */
332  BH_Revoked, /* Has been revoked from the log */
333  BH_RevokeValid, /* Revoked flag is valid */
334  BH_JBDDirty, /* Is dirty but journaled */
335  BH_State, /* Pins most journal_head state */
336  BH_JournalHead, /* Pins bh->b_private and jh->b_bh */
337  BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */
338 };
339 
340 BUFFER_FNS(JBD, jbd)
341 BUFFER_FNS(JWrite, jwrite)
342 BUFFER_FNS(JBDDirty, jbddirty)
343 TAS_BUFFER_FNS(JBDDirty, jbddirty)
344 BUFFER_FNS(Revoked, revoked)
345 TAS_BUFFER_FNS(Revoked, revoked)
346 BUFFER_FNS(RevokeValid, revokevalid)
347 TAS_BUFFER_FNS(RevokeValid, revokevalid)
348 BUFFER_FNS(Freed, freed)
349 
350 static inline struct buffer_head *jh2bh(struct journal_head *jh)
351 {
352  return jh->b_bh;
353 }
354 
355 static inline struct journal_head *bh2jh(struct buffer_head *bh)
356 {
357  return bh->b_private;
358 }
359 
360 static inline void jbd_lock_bh_state(struct buffer_head *bh)
361 {
362  bit_spin_lock(BH_State, &bh->b_state);
363 }
364 
365 static inline int jbd_trylock_bh_state(struct buffer_head *bh)
366 {
367  return bit_spin_trylock(BH_State, &bh->b_state);
368 }
369 
370 static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
371 {
372  return bit_spin_is_locked(BH_State, &bh->b_state);
373 }
374 
375 static inline void jbd_unlock_bh_state(struct buffer_head *bh)
376 {
377  bit_spin_unlock(BH_State, &bh->b_state);
378 }
379 
380 static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
381 {
382  bit_spin_lock(BH_JournalHead, &bh->b_state);
383 }
384 
385 static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
386 {
387  bit_spin_unlock(BH_JournalHead, &bh->b_state);
388 }
389 
390 struct jbd_revoke_table_s;
391 
405 /* Docbook can't yet cope with the bit fields, but will leave the documentation
406  * in so it can be fixed later.
407  */
408 
409 struct handle_s
410 {
411  /* Which compound transaction is this update a part of? */
412  transaction_t *h_transaction;
413 
414  /* Number of remaining buffers we are allowed to dirty: */
415  int h_buffer_credits;
416 
417  /* Reference count on this handle */
418  int h_ref;
419 
420  /* Field for caller's use to track errors through large fs */
421  /* operations */
422  int h_err;
423 
424  /* Flags [no locking] */
425 unsigned int h_sync:
426  1; /* sync-on-close */
427 unsigned int h_jdata:
428  1; /* force data journaling */
429 unsigned int h_aborted:
430  1; /* fatal error on handle */
431 
432 #ifdef CONFIG_DEBUG_LOCK_ALLOC
433  struct lockdep_map h_lockdep_map;
434 #endif
435 };
436 
437 
438 /* The transaction_t type is the guts of the journaling mechanism. It
439  * tracks a compound transaction through its various states:
440  *
441  * RUNNING: accepting new updates
442  * LOCKED: Updates still running but we don't accept new ones
443  * RUNDOWN: Updates are tidying up but have finished requesting
444  * new buffers to modify (state not used for now)
445  * FLUSH: All updates complete, but we are still writing to disk
446  * COMMIT: All data on disk, writing commit record
447  * FINISHED: We still have to keep the transaction for checkpointing.
448  *
449  * The transaction keeps track of all of the buffers modified by a
450  * running transaction, and all of the buffers committed but not yet
451  * flushed to home for finished transactions.
452  */
453 
454 /*
455  * Lock ranking:
456  *
457  * j_list_lock
458  * ->jbd_lock_bh_journal_head() (This is "innermost")
459  *
460  * j_state_lock
461  * ->jbd_lock_bh_state()
462  *
463  * jbd_lock_bh_state()
464  * ->j_list_lock
465  *
466  * j_state_lock
467  * ->t_handle_lock
468  *
469  * j_state_lock
470  * ->j_list_lock (journal_unmap_buffer)
471  *
472  */
473 
474 struct transaction_s
475 {
476  /* Pointer to the journal for this transaction. [no locking] */
477  journal_t *t_journal;
478 
479  /* Sequence number for this transaction [no locking] */
480  tid_t t_tid;
481 
482  /*
483  * Transaction's current state
484  * [no locking - only kjournald alters this]
485  * [j_list_lock] guards transition of a transaction into T_FINISHED
486  * state and subsequent call of __journal_drop_transaction()
487  * FIXME: needs barriers
488  * KLUDGE: [use j_state_lock]
489  */
490  enum {
491  T_RUNNING,
492  T_LOCKED,
493  T_RUNDOWN,
494  T_FLUSH,
495  T_COMMIT,
496  T_FINISHED
497  } t_state;
498 
499  /*
500  * Where in the log does this transaction's commit start? [no locking]
501  */
502  unsigned long t_log_start;
503 
504  /* Number of buffers on the t_buffers list [j_list_lock] */
505  int t_nr_buffers;
506 
507  /*
508  * Doubly-linked circular list of all buffers reserved but not yet
509  * modified by this transaction [j_list_lock]
510  */
511  struct journal_head *t_reserved_list;
512 
513  /*
514  * Doubly-linked circular list of all buffers under writeout during
515  * commit [j_list_lock]
516  */
517  struct journal_head *t_locked_list;
518 
519  /*
520  * Doubly-linked circular list of all metadata buffers owned by this
521  * transaction [j_list_lock]
522  */
523  struct journal_head *t_buffers;
524 
525  /*
526  * Doubly-linked circular list of all data buffers still to be
527  * flushed before this transaction can be committed [j_list_lock]
528  */
529  struct journal_head *t_sync_datalist;
530 
531  /*
532  * Doubly-linked circular list of all forget buffers (superseded
533  * buffers which we can un-checkpoint once this transaction commits)
534  * [j_list_lock]
535  */
536  struct journal_head *t_forget;
537 
538  /*
539  * Doubly-linked circular list of all buffers still to be flushed before
540  * this transaction can be checkpointed. [j_list_lock]
541  */
542  struct journal_head *t_checkpoint_list;
543 
544  /*
545  * Doubly-linked circular list of all buffers submitted for IO while
546  * checkpointing. [j_list_lock]
547  */
548  struct journal_head *t_checkpoint_io_list;
549 
550  /*
551  * Doubly-linked circular list of temporary buffers currently undergoing
552  * IO in the log [j_list_lock]
553  */
554  struct journal_head *t_iobuf_list;
555 
556  /*
557  * Doubly-linked circular list of metadata buffers being shadowed by log
558  * IO. The IO buffers on the iobuf list and the shadow buffers on this
559  * list match each other one for one at all times. [j_list_lock]
560  */
561  struct journal_head *t_shadow_list;
562 
563  /*
564  * Doubly-linked circular list of control buffers being written to the
565  * log. [j_list_lock]
566  */
567  struct journal_head *t_log_list;
568 
569  /*
570  * Protects info related to handles
571  */
572  jbdlock_t t_handle_lock;
573 
574  /*
575  * Number of outstanding updates running on this transaction
576  * [t_handle_lock]
577  */
578  int t_updates;
579 
580  /*
581  * Number of buffers reserved for use by all handles in this transaction
582  * handle but not yet modified. [t_handle_lock]
583  */
584  int t_outstanding_credits;
585 
586  /*
587  * Forward and backward links for the circular list of all transactions
588  * awaiting checkpoint. [j_list_lock]
589  */
590  transaction_t *t_cpnext, *t_cpprev;
591 
592  /*
593  * When will the transaction expire (become due for commit), in jiffies?
594  * [no locking]
595  */
596  unsigned long t_expires;
597 
598  /*
599  * How many handles used this transaction? [t_handle_lock]
600  */
601  int t_handle_count;
602 
603 };
604 
669 struct journal_s
670 {
671  /* General journaling state flags [j_state_lock] */
672  unsigned long j_flags;
673 
674  /*
675  * Is there an outstanding uncleared error on the journal (from a prior
676  * abort)? [j_state_lock]
677  */
678  int j_errno;
679 
680  /* The superblock buffer */
681  struct buffer_head *j_sb_buffer;
682  journal_superblock_t *j_superblock;
683 
684  /* Version of the superblock format */
685  int j_format_version;
686 
687  /*
688  * Protect the various scalars in the journal
689  */
690  jbdlock_t j_state_lock;
691 
692  /*
693  * Number of processes waiting to create a barrier lock [j_state_lock]
694  */
695  int j_barrier_count;
696 
697  /* The barrier lock itself */
698  struct mutex j_barrier;
699 
700  /*
701  * Transactions: The current running transaction...
702  * [j_state_lock] [caller holding open handle]
703  */
704  transaction_t *j_running_transaction;
705 
706  /*
707  * the transaction we are pushing to disk
708  * [j_state_lock] [caller holding open handle]
709  */
710  transaction_t *j_committing_transaction;
711 
712  /*
713  * ... and a linked circular list of all transactions waiting for
714  * checkpointing. [j_list_lock]
715  */
716  transaction_t *j_checkpoint_transactions;
717 
718  /*
719  * Wait queue for waiting for a locked transaction to start committing,
720  * or for a barrier lock to be released
721  */
722  wait_queue_head_t j_wait_transaction_locked;
723 
724  /* Wait queue for waiting for checkpointing to complete */
725  wait_queue_head_t j_wait_logspace;
726 
727  /* Wait queue for waiting for commit to complete */
728  wait_queue_head_t j_wait_done_commit;
729 
730  /* Wait queue to trigger checkpointing */
731  wait_queue_head_t j_wait_checkpoint;
732 
733  /* Wait queue to trigger commit */
734  wait_queue_head_t j_wait_commit;
735 
736  /* Wait queue to wait for updates to complete */
737  wait_queue_head_t j_wait_updates;
738 
739  /* Semaphore for locking against concurrent checkpoints */
740  struct mutex j_checkpoint_mutex;
741 
742  /*
743  * Journal head: identifies the first unused block in the journal.
744  * [j_state_lock]
745  */
746  unsigned long j_head;
747 
748  /*
749  * Journal tail: identifies the oldest still-used block in the journal.
750  * [j_state_lock]
751  */
752  unsigned long j_tail;
753 
754  /*
755  * Journal free: how many free blocks are there in the journal?
756  * [j_state_lock]
757  */
758  unsigned long j_free;
759 
760  /*
761  * Journal start and end: the block numbers of the first usable block
762  * and one beyond the last usable block in the journal. [j_state_lock]
763  */
764  unsigned long j_first;
765  unsigned long j_last;
766 
767  /*
768  * Device, blocksize and starting block offset for the location where we
769  * store the journal.
770  */
771  struct block_device *j_dev;
772  int j_blocksize;
773  unsigned long j_blk_offset;
774 
775  /*
776  * Device which holds the client fs. For internal journal this will be
777  * equal to j_dev.
778  */
779  struct block_device *j_fs_dev;
780 
781  /* Total maximum capacity of the journal region on disk. */
782  unsigned int j_maxlen;
783 
784  /*
785  * Protects the buffer lists and internal buffer state.
786  */
787  jbdlock_t j_list_lock;
788 
789  /* Optional inode where we store the journal. If present, all */
790  /* journal block numbers are mapped into this inode via */
791  /* bmap(). */
792  struct inode *j_inode;
793 
794  /*
795  * Sequence number of the oldest transaction in the log [j_state_lock]
796  */
797  tid_t j_tail_sequence;
798 
799  /*
800  * Sequence number of the next transaction to grant [j_state_lock]
801  */
802  tid_t j_transaction_sequence;
803 
804  /*
805  * Sequence number of the most recently committed transaction
806  * [j_state_lock].
807  */
808  tid_t j_commit_sequence;
809 
810  /*
811  * Sequence number of the most recent transaction wanting commit
812  * [j_state_lock]
813  */
814  tid_t j_commit_request;
815 
816  /*
817  * Journal uuid: identifies the object (filesystem, LVM volume etc)
818  * backed by this journal. This will eventually be replaced by an array
819  * of uuids, allowing us to index multiple devices within a single
820  * journal and to perform atomic updates across them.
821  */
822  __u8 j_uuid[16];
823 
824  /* Pointer to the current commit thread for this journal */
825  struct task_struct *j_task;
826 
827  /*
828  * Maximum number of metadata buffers to allow in a single compound
829  * commit transaction
830  */
831  int j_max_transaction_buffers;
832 
833  /*
834  * What is the maximum transaction lifetime before we begin a commit?
835  */
836  unsigned long j_commit_interval;
837 
838  /* The timer used to wakeup the commit thread: */
839  struct timer_list j_commit_timer;
840 
841  /*
842  * The revoke table: maintains the list of revoked blocks in the
843  * current transaction. [j_revoke_lock]
844  */
845  jbdlock_t j_revoke_lock;
846  struct jbd_revoke_table_s *j_revoke;
847  struct jbd_revoke_table_s *j_revoke_table[2];
848 
849  /*
850  * array of bhs for journal_commit_transaction
851  */
852  struct buffer_head **j_wbuf;
853  int j_wbufsize;
854 
855  pid_t j_last_sync_writer;
856 
857  /*
858  * An opaque pointer to fs-private information. ext3 puts its
859  * superblock pointer here
860  */
861  void *j_private;
862 };
863 
864 /*
865  * Journal flag definitions
866  */
867 #define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */
868 #define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */
869 #define JFS_ACK_ERR 0x004 /* The errno in the sb has been acked */
870 #define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */
871 #define JFS_LOADED 0x010 /* The journal superblock has been loaded */
872 #define JFS_BARRIER 0x020 /* Use IDE barriers */
873 
874 /*
875  * Function declarations for the journaling transaction and buffer
876  * management
877  */
878 
879 /* Filing buffers */
880 extern void journal_unfile_buffer(journal_t *, struct journal_head *);
881 extern void __journal_unfile_buffer(struct journal_head *);
882 extern void __journal_refile_buffer(struct journal_head *);
883 extern void journal_refile_buffer(journal_t *, struct journal_head *);
884 extern void __journal_file_buffer(struct journal_head *, transaction_t *, int);
885 extern void __journal_free_buffer(struct journal_head *bh);
886 extern void journal_file_buffer(struct journal_head *, transaction_t *, int);
887 extern void __journal_clean_data_list(transaction_t *transaction);
888 
889 /* Log buffer allocation */
890 extern struct journal_head * journal_get_descriptor_buffer(journal_t *);
891 int journal_next_log_block(journal_t *, unsigned long *);
892 
893 /* Commit management */
894 extern void journal_commit_transaction(journal_t *);
895 
896 /* Checkpoint list management */
897 int __journal_clean_checkpoint_list(journal_t *journal);
898 int __journal_remove_checkpoint(struct journal_head *);
899 void __journal_insert_checkpoint(struct journal_head *, transaction_t *);
900 
901 /* Buffer IO */
902 extern int
903  journal_write_metadata_buffer(transaction_t *transaction,
904  struct journal_head *jh_in,
905  struct journal_head **jh_out,
906  unsigned long blocknr);
907 
908 /* Transaction locking */
909 extern void __wait_on_journal (journal_t *);
910 
911 /*
912  * Journal locking.
913  *
914  * We need to lock the journal during transaction state changes so that nobody
915  * ever tries to take a handle on the running transaction while we are in the
916  * middle of moving it to the commit phase. j_state_lock does this.
917  *
918  * Note that the locking is completely interrupt unsafe. We never touch
919  * journal structures from interrupts.
920  */
921 
922 static inline handle_t *journal_current_handle(void)
923 {
924  return NULL;
925  /* return current->journal_info; */
926 #ifdef _MSC_VER
927 #pragma message("WARNINGS: journal_current_handle NOT implemented")
928 #endif
929 }
930 
931 /* The journaling code user interface:
932  *
933  * Create and destroy handles
934  * Register buffer modifications against the current transaction.
935  */
936 
937 extern handle_t *journal_start(journal_t *, int nblocks);
938 extern int journal_restart (handle_t *, int nblocks);
939 extern int journal_extend (handle_t *, int nblocks);
940 extern int journal_get_write_access(handle_t *, struct buffer_head *);
941 extern int journal_get_create_access (handle_t *, struct buffer_head *);
942 extern int journal_get_undo_access(handle_t *, struct buffer_head *);
943 extern int journal_dirty_data (handle_t *, struct buffer_head *);
944 extern int journal_dirty_metadata (handle_t *, struct buffer_head *);
945 extern void journal_release_buffer (handle_t *, struct buffer_head *);
946 extern int journal_forget (handle_t *, struct buffer_head *);
947 extern void journal_sync_buffer (struct buffer_head *);
948 extern void journal_invalidatepage(journal_t *,
949  struct page *, unsigned long);
950 extern int journal_try_to_free_buffers(journal_t *, struct page *, gfp_t);
951 extern int journal_stop(handle_t *);
952 extern int journal_flush (journal_t *);
953 extern void journal_lock_updates (journal_t *);
954 extern void journal_unlock_updates (journal_t *);
955 
956 extern journal_t * journal_init_dev(struct block_device *bdev,
957  struct block_device *fs_dev,
958  int start, int len, int bsize);
959 extern journal_t * journal_init_inode (struct inode *);
960 extern int journal_update_format (journal_t *);
962  (journal_t *, unsigned long, unsigned long, unsigned long);
964  (journal_t *, unsigned long, unsigned long, unsigned long);
965 extern int journal_set_features
966  (journal_t *, unsigned long, unsigned long, unsigned long);
967 extern int journal_create (journal_t *);
968 extern int journal_load (journal_t *journal);
969 extern void journal_destroy (journal_t *);
970 extern int journal_recover (journal_t *journal);
971 extern int journal_wipe (journal_t *, int);
972 extern int journal_skip_recovery (journal_t *);
973 extern void journal_update_superblock (journal_t *, int);
974 void journal_abort (journal_t *, int);
975 extern int journal_errno (journal_t *);
976 extern void journal_ack_err (journal_t *);
977 extern int journal_clear_err (journal_t *);
978 extern int journal_bmap(journal_t *, unsigned long, unsigned long *);
979 extern int journal_force_commit(journal_t *);
980 
981 /* added by matt */
982 void journal_wipe_recovery(journal_t *journal);
983 
984 /*
985  * journal_head management
986  */
990 void journal_put_journal_head(struct journal_head *jh);
991 
992 /*
993  * handle management
994  */
995 extern struct kmem_cache *jbd_handle_cache;
996 
997 static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags)
998 {
999  return (handle_t *)kmem_cache_alloc(jbd_handle_cache, gfp_flags);
1000 }
1001 
1002 static inline void jbd_free_handle(handle_t *handle)
1003 {
1005 }
1006 
1007 /* Primary revoke support */
1008 #define JOURNAL_REVOKE_DEFAULT_HASH 256
1009 extern int journal_init_revoke(journal_t *, int);
1010 extern void journal_destroy_revoke_caches(void);
1011 extern int journal_init_revoke_caches(void);
1012 
1013 extern void journal_destroy_revoke(journal_t *);
1014 extern int journal_revoke (handle_t *,
1015  unsigned long, struct buffer_head *);
1016 extern int journal_cancel_revoke(handle_t *, struct journal_head *);
1017 extern void journal_write_revoke_records(journal_t *, transaction_t *);
1018 
1019 /* Recovery revoke support */
1020 extern int journal_set_revoke(journal_t *, unsigned long, tid_t);
1021 extern int journal_test_revoke(journal_t *, unsigned long, tid_t);
1022 extern void journal_clear_revoke(journal_t *);
1023 extern void journal_switch_revoke_table(journal_t *journal);
1024 
1025 /*
1026  * The log thread user interface:
1027  *
1028  * Request space in the current transaction, and force transaction commit
1029  * transitions on demand.
1030  */
1031 
1032 int __log_space_left(journal_t *); /* Called with journal locked */
1033 int log_start_commit(journal_t *journal, tid_t tid);
1034 int __log_start_commit(journal_t *journal, tid_t tid);
1035 int journal_start_commit(journal_t *journal, tid_t *tid);
1036 int journal_force_commit_nested(journal_t *journal);
1037 int log_wait_commit(journal_t *journal, tid_t tid);
1038 int log_do_checkpoint(journal_t *journal);
1039 
1040 void __log_wait_for_space(journal_t *journal);
1041 extern void __journal_drop_transaction(journal_t *, transaction_t *);
1042 extern int cleanup_journal_tail(journal_t *);
1043 
1044 /* Debugging code only: */
1045 
1046 #define jbd_ENOSYS() \
1047 do { \
1048  printk (KERN_ERR "JBD unimplemented function %s\n", __FUNCTION__); \
1049  current->state = TASK_UNINTERRUPTIBLE; \
1050  schedule(); \
1051 } while (1)
1052 
1053 /*
1054  * is_journal_abort
1055  *
1056  * Simple test wrapper function to test the JFS_ABORT state flag. This
1057  * bit, when set, indicates that we have had a fatal error somewhere,
1058  * either inside the journaling layer or indicated to us by the client
1059  * (eg. ext3), and that we and should not commit any further
1060  * transactions.
1061  */
1062 
1063 static inline int is_journal_aborted(journal_t *journal)
1064 {
1065  return journal->j_flags & JFS_ABORT;
1066 }
1067 
1068 static inline int is_handle_aborted(handle_t *handle)
1069 {
1070  if (handle->h_aborted)
1071  return 1;
1072  return is_journal_aborted(handle->h_transaction->t_journal);
1073 }
1074 
1075 static inline void journal_abort_handle(handle_t *handle)
1076 {
1077  handle->h_aborted = 1;
1078 }
1079 
1080 #endif /* __KERNEL__ */
1081 
1082 /* Comparison functions for transaction IDs: perform comparisons using
1083  * modulo arithmetic so that they work over sequence number wraps. */
1084 
1085 static inline int tid_gt(tid_t x, tid_t y)
1086 {
1087  int difference = (x - y);
1088  return (difference > 0);
1089 }
1090 
1091 static inline int tid_geq(tid_t x, tid_t y)
1092 {
1093  int difference = (x - y);
1094  return (difference >= 0);
1095 }
1096 
1097 extern int journal_blocks_per_page(struct inode *inode);
1098 
1099 /*
1100  * Return the minimum number of blocks which must be free in the journal
1101  * before a new transaction may be started. Must be called under j_state_lock.
1102  */
1103 static inline int jbd_space_needed(journal_t *journal)
1104 {
1105  int nblocks = journal->j_max_transaction_buffers;
1106  if (journal->j_committing_transaction)
1107  nblocks += journal->j_committing_transaction->
1108  t_outstanding_credits;
1109  return nblocks;
1110 }
1111 
1112 /*
1113  * Definitions which augment the buffer_head layer
1114  */
1115 
1116 /* journaling buffer types */
1117 #define BJ_None 0 /* Not journaled */
1118 #define BJ_SyncData 1 /* Normal data: flush before commit */
1119 #define BJ_Metadata 2 /* Normal journaled metadata */
1120 #define BJ_Forget 3 /* Buffer superseded by this transaction */
1121 #define BJ_IO 4 /* Buffer is for temporary IO use */
1122 #define BJ_Shadow 5 /* Buffer contents being shadowed to the log */
1123 #define BJ_LogCtl 6 /* Buffer contains log descriptors */
1124 #define BJ_Reserved 7 /* Buffer is reserved for access by journal */
1125 #define BJ_Locked 8 /* Locked for I/O during commit */
1126 #define BJ_Types 9
1127 
1128 extern int jbd_blocks_per_page(struct inode *inode);
1129 
1130 #ifdef __KERNEL__
1131 
1132 #define buffer_trace_init(bh) do {} while (0)
1133 #define print_buffer_fields(bh) do {} while (0)
1134 #define print_buffer_trace(bh) do {} while (0)
1135 #define BUFFER_TRACE(bh, info) do {} while (0)
1136 #define BUFFER_TRACE2(bh, bh2, info) do {} while (0)
1137 #define JBUFFER_TRACE(jh, info) do {} while (0)
1138 
1139 #endif /* __KERNEL__ */
1140 
1141 #endif /* _LINUX_JBD_H */
journal_header_t r_header
Definition: jbd.h:201
unsigned __bitwise gfp_t
Definition: types.h:69
__be32 s_dynsuper
Definition: jbd.h:247
__be32 s_feature_incompat
Definition: jbd.h:239
unsigned char __u8
Definition: compat.h:88
void journal_remove_journal_head(struct buffer_head *bh)
Definition: replay.c:432
int __init journal_init_revoke_caches(void)
Definition: revoke.c:170
int journal_update_format(journal_t *journal)
Definition: replay.c:999
struct buffer_head * b_bh
Definition: journal-head.h:21
int journal_test_revoke(journal_t *journal, unsigned long blocknr, tid_t sequence)
Definition: revoke.c:670
void journal_release_buffer(handle_t *handle, struct buffer_head *bh)
Definition: replay.c:1425
rwlock_t lock
Definition: tcpcore.h:1163
static int jbd_space_needed(journal_t *journal)
Definition: jbd.h:1103
__be32 s_errno
Definition: jbd.h:234
struct journal_header_s journal_header_t
void journal_update_superblock(journal_t *journal, int wait)
Definition: replay.c:1030
tid_t
Definition: ieframe.h:311
__be32 s_first
Definition: jbd.h:225
int journal_init_revoke(journal_t *journal, int hash_size)
Definition: revoke.c:201
__be32 h_sequence
Definition: jbd.h:182
static int tid_gt(tid_t x, tid_t y)
Definition: jbd.h:1085
void journal_destroy_revoke_caches(void)
Definition: revoke.c:191
__be32 h_blocktype
Definition: jbd.h:181
__be32 s_maxlen
Definition: jbd.h:224
int journal_load(journal_t *journal)
Definition: replay.c:1121
__be32 s_max_transaction
Definition: jbd.h:250
int journal_clear_err(journal_t *journal)
Definition: replay.c:179
struct journal_superblock_s journal_superblock_t
void * kmem_cache_alloc(kmem_cache_t *kc, int flags)
Definition: linux.c:92
DWORD pid_t
Definition: types.h:91
void * b_private
Definition: module.h:727
GLint GLint GLint GLint GLint x
Definition: gl.h:1548
static void bit_spin_unlock(int bitnum, unsigned long *addr)
Definition: bit_spinlock.h:51
int journal_check_available_features(journal_t *journal, unsigned long compat, unsigned long ro, unsigned long incompat)
Definition: replay.c:767
VOID FASTCALL ExReleaseFastMutex(IN PFAST_MUTEX FastMutex)
Definition: fmutex.c:31
void journal_abort(journal_t *journal, int err)
Definition: replay.c:143
struct journal_revoke_header_s journal_revoke_header_t
void journal_clear_revoke(journal_t *journal)
Definition: revoke.c:689
Definition: fs.h:78
__be32 s_feature_ro_compat
Definition: jbd.h:240
struct journal_head * journal_get_descriptor_buffer(journal_t *journal)
Definition: replay.c:518
void __journal_unfile_buffer(struct journal_head *jh)
Definition: replay.c:1286
__be32 s_start
Definition: jbd.h:230
int journal_wipe(journal_t *journal, int write)
Definition: replay.c:964
static void bit_spin_lock(int bitnum, unsigned long *addr)
Definition: bit_spinlock.h:10
__be32 t_flags
Definition: jbd.h:192
__be32 h_magic
Definition: jbd.h:180
int jbd_blocks_per_page(struct inode *inode)
int journal_blocks_per_page(struct inode *inode)
Definition: replay.c:207
static PVOID ptr
Definition: dispmode.c:27
static int bit_spin_is_locked(int bitnum, unsigned long *addr)
Definition: bit_spinlock.h:83
smooth NULL
Definition: ftsmooth.c:416
unsigned long b_state
Definition: module.h:715
Definition: module.h:566
void journal_wipe_recovery(journal_t *journal)
Definition: replay.c:659
__be32 t_blocknr
Definition: jbd.h:191
journal_header_t s_header
Definition: jbd.h:219
__u8 s_uuid[16]
Definition: jbd.h:242
GLsizeiptr size
Definition: glext.h:5919
int journal_errno(journal_t *journal)
Definition: replay.c:159
int log_start_commit(journal_t *journal, tid_t tid)
Definition: replay.c:42
__be32 s_sequence
Definition: jbd.h:229
FORCEINLINE VOID ExInitializeFastMutex(_Out_ PFAST_MUTEX FastMutex)
Definition: exfuncs.h:274
static int tid_geq(tid_t x, tid_t y)
Definition: jbd.h:1091
struct journal_head * journal_grab_journal_head(struct buffer_head *bh)
Definition: replay.c:368
BOOLEAN FASTCALL ExTryToAcquireFastMutex(IN PFAST_MUTEX FastMutex)
Definition: fmutex.c:39
#define BUFFER_FNS(bit, name)
Definition: module.h:742
int __log_start_commit(journal_t *journal, tid_t target)
Definition: replay.c:21
unsigned int __u32
Definition: compat.h:90
__u32 s_padding[44]
Definition: jbd.h:254
UCHAR u8
Definition: btrfs.h:12
int journal_forget(handle_t *handle, struct buffer_head *bh)
Definition: replay.c:1447
GLbitfield flags
Definition: glext.h:7161
int journal_recover(journal_t *journal)
Definition: recovery.c:225
int journal_next_log_block(journal_t *journal, unsigned long *retp)
Definition: replay.c:461
int journal_set_features(journal_t *journal, unsigned long compat, unsigned long ro, unsigned long incompat)
Definition: replay.c:804
void journal_destroy(journal_t *journal)
Definition: replay.c:678
void kmem_cache_free(kmem_cache_t *kc, void *p)
Definition: linux.c:103
struct journal_head * journal_add_journal_head(struct buffer_head *bh)
Definition: replay.c:325
GLenum GLsizei len
Definition: glext.h:6722
__be32 s_feature_compat
Definition: jbd.h:238
int journal_bmap(journal_t *journal, unsigned long blocknr, unsigned long *retp)
Definition: replay.c:484
journal_t * journal_init_inode(struct inode *inode)
Definition: replay.c:592
void journal_ack_err(journal_t *journal)
Definition: replay.c:199
void journal_unfile_buffer(journal_t *journal, struct journal_head *jh)
Definition: replay.c:1292
int journal_check_used_features(journal_t *journal, unsigned long compat, unsigned long ro, unsigned long incompat)
Definition: replay.c:736
__be32 s_blocksize
Definition: jbd.h:223
struct kmem_cache * jbd_handle_cache
Definition: replay.c:1583
void * kmalloc(size_t, int)
VOID FASTCALL ExAcquireFastMutex(IN PFAST_MUTEX FastMutex)
Definition: fmutex.c:23
__be32 s_nr_users
Definition: jbd.h:245
static int bit_spin_trylock(int bitnum, unsigned long *addr)
Definition: bit_spinlock.h:35
GLuint start
Definition: gl.h:1545
__u32 __bitwise __be32
Definition: types.h:63
__u8 s_users[16 *48]
Definition: jbd.h:257
GLint GLint GLint GLint GLint GLint y
Definition: gl.h:1548
__be32 s_max_trans_data
Definition: jbd.h:251
int journal_skip_recovery(journal_t *journal)
Definition: recovery.c:282
struct transaction_s transaction_t
Definition: journal-head.h:14
struct journal_block_tag_s journal_block_tag_t
void journal_put_journal_head(struct journal_head *jh)
Definition: replay.c:443
#define TAS_BUFFER_FNS(bit, name)
Definition: module.h:759
Definition: module.h:446
void journal_file_buffer(struct journal_head *jh, transaction_t *transaction, int jlist)
Definition: replay.c:1408
static TfClientId tid
void __journal_file_buffer(struct journal_head *jh, transaction_t *transaction, int jlist)
Definition: replay.c:1337
void journal_destroy_revoke(journal_t *journal)
Definition: revoke.c:271
int journal_set_revoke(journal_t *journal, unsigned long blocknr, tid_t sequence)
Definition: revoke.c:646
void kfree(const void *)