/*
* linux/include/linux/jbd.h
- *
+ *
* Written by Stephen C. Tweedie <sct@redhat.com>
*
* Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
#define jbd_debug(f, a...) /**/
#else
#define jbd_debug(f, ...) /**/
-#endif
+#endif
#endif
#else
#define jbd_debug(x) /* AIX doesn't do STDC */
* On-disk structures
*/
-/*
+/*
* Descriptor block types:
*/
__u32 h_commit_nsec;
};
-/*
- * The block tag: used to describe a single buffer in the journal
+/*
+ * The block tag: used to describe a single buffer in the journal
*/
typedef struct journal_block_tag_s
{
#define JBD_TAG_SIZE64 (sizeof(journal_block_tag_t))
#define JBD_TAG_SIZE32 (8)
-/*
+/*
* The revoke descriptor: used on disk to describe a series of blocks to
- * be revoked from the log
+ * be revoked from the log
*/
typedef struct journal_revoke_header_s
{
__u32 s_blocksize; /* journal device blocksize */
__u32 s_maxlen; /* total blocks in journal file */
__u32 s_first; /* first block of log information */
-
+
/* 0x0018 */
/* Dynamic information describing the current state of the log */
__u32 s_sequence; /* first commit ID expected in log */
/* 0x0040 */
__u32 s_nr_users; /* Nr of filesystems sharing log */
-
+
__u32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
-
+
/* 0x0048 */
__u32 s_max_transaction; /* Limit of journal blocks per trans.*/
__u32 s_max_trans_data; /* Limit of data blocks per trans. */
* the transaction, so that at all times we know how many buffers the
* outstanding updates on a transaction might possibly touch. */
-struct handle_s
+struct handle_s
{
/* Which compound transaction is this update a part of? */
transaction_t * h_transaction;
* flushed to home for finished transactions.
*/
-struct transaction_s
+struct transaction_s
{
/* Pointer to the journal for this transaction. */
journal_t * t_journal;
-
+
/* Sequence number for this transaction */
tid_t t_tid;
-
+
/* Transaction's current state */
enum {
T_RUNNING,
T_RUNDOWN,
T_FLUSH,
T_COMMIT,
- T_FINISHED
+ T_FINISHED
} t_state;
/* Where in the log does this transaction's commit start? */
unsigned long t_log_start;
-
+
/* Doubly-linked circular list of all inodes owned by this
transaction */ /* AKPM: unused */
struct inode * t_ilist;
-
+
/* Number of buffers on the t_buffers list */
int t_nr_buffers;
-
+
/* Doubly-linked circular list of all buffers reserved but not
yet modified by this transaction */
struct journal_head * t_reserved_list;
-
+
/* Doubly-linked circular list of all metadata buffers owned by this
transaction */
struct journal_head * t_buffers;
-
+
/*
* Doubly-linked circular list of all data buffers still to be
* flushed before this transaction can be committed.
* Protected by journal_datalist_lock.
*/
struct journal_head * t_sync_datalist;
-
+
/*
* Doubly-linked circular list of all writepage data buffers
* still to be written before this transaction can be committed.
* Protected by journal_datalist_lock.
*/
struct journal_head * t_async_datalist;
-
+
/* Doubly-linked circular list of all forget buffers (superceded
buffers which we can un-checkpoint once this transaction
commits) */
struct journal_head * t_forget;
-
+
/*
* Doubly-linked circular list of all buffers still to be
* flushed before this transaction can be checkpointed.
*/
/* Protected by journal_datalist_lock */
struct journal_head * t_checkpoint_list;
-
+
/* Doubly-linked circular list of temporary buffers currently
undergoing IO in the log */
struct journal_head * t_iobuf_list;
-
+
/* Doubly-linked circular list of metadata buffers being
shadowed by log IO. The IO buffers on the iobuf list and the
shadow buffers on this list match each other one for one at
all times. */
struct journal_head * t_shadow_list;
-
+
/* Doubly-linked circular list of control buffers being written
to the log. */
struct journal_head * t_log_list;
-
+
/* Number of outstanding updates running on this transaction */
int t_updates;
/* Number of buffers reserved for use by all handles in this
* transaction handle but not yet modified. */
int t_outstanding_credits;
-
+
/*
* Forward and backward links for the circular list of all
* transactions awaiting checkpoint.
/* The journal_t maintains all of the journaling state information for a
* single filesystem. It is linked to from the fs superblock structure.
- *
+ *
* We use the journal_t to keep track of all outstanding transaction
* activity on the filesystem, and to manage the state of the log
* writing process. */
/* Is there an outstanding uncleared error on the journal (from
* a prior abort)? */
int j_errno;
-
+
/* The superblock buffer */
struct buffer_head * j_sb_buffer;
journal_superblock_t * j_superblock;
/* Number of processes waiting to create a barrier lock */
int j_barrier_count;
-
+
/* The barrier lock itself */
struct semaphore j_barrier;
-
+
/* Transactions: The current running transaction... */
transaction_t * j_running_transaction;
-
+
/* ... the transaction we are pushing to disk ... */
transaction_t * j_committing_transaction;
-
+
/* ... and a linked circular list of all transactions waiting
* for checkpointing. */
/* Protected by journal_datalist_lock */
/* Wait queue for waiting for a locked transaction to start
committing, or for a barrier lock to be released */
wait_queue_head_t j_wait_transaction_locked;
-
+
/* Wait queue for waiting for checkpointing to complete */
wait_queue_head_t j_wait_logspace;
-
+
/* Wait queue for waiting for commit to complete */
wait_queue_head_t j_wait_done_commit;
-
+
/* Wait queue to trigger checkpointing */
wait_queue_head_t j_wait_checkpoint;
-
+
/* Wait queue to trigger commit */
wait_queue_head_t j_wait_commit;
-
+
/* Wait queue to wait for updates to complete */
wait_queue_head_t j_wait_updates;
/* The main journal lock, used by lock_journal() */
struct semaphore j_sem;
-
+
/* Journal head: identifies the first unused block in the journal. */
unsigned long j_head;
-
+
/* Journal tail: identifies the oldest still-used block in the
* journal. */
unsigned long j_tail;
unsigned int j_failed_commit;
};
-/*
- * Journal flag definitions
+/*
+ * Journal flag definitions
*/
#define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */
#define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */
#define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */
#define JFS_LOADED 0x010 /* The journal superblock has been loaded */
-/*
+/*
* Function declarations for the journaling transaction and buffer
* management
*/
extern void __journal_insert_checkpoint(struct journal_head *,transaction_t *);
/* Buffer IO */
-extern int
+extern int
journal_write_metadata_buffer(transaction_t *transaction,
struct journal_head *jh_in,
struct journal_head **jh_out,
*
* We need to lock the journal during transaction state changes so that
* nobody ever tries to take a handle on the running transaction while
- * we are in the middle of moving it to the commit phase.
+ * we are in the middle of moving it to the commit phase.
*
* Note that the locking is completely interrupt unsafe. We never touch
* journal structures from interrupts.
/* The journaling code user interface:
*
* Create and destroy handles
- * Register buffer modifications against the current transaction.
+ * Register buffer modifications against the current transaction.
*/
extern handle_t *journal_start(journal_t *, int nblocks);
int start, int len, int bsize);
extern journal_t * journal_init_inode (struct inode *);
extern int journal_update_format (journal_t *);
-extern int journal_check_used_features
+extern int journal_check_used_features
(journal_t *, unsigned long, unsigned long, unsigned long);
-extern int journal_check_available_features
+extern int journal_check_available_features
(journal_t *, unsigned long, unsigned long, unsigned long);
-extern int journal_set_features
+extern int journal_set_features
(journal_t *, unsigned long, unsigned long, unsigned long);
extern int journal_create (journal_t *);
extern int journal_load (journal_t *journal);
* bit, when set, indicates that we have had a fatal error somewhere,
* either inside the journaling layer or indicated to us by the client
* (eg. ext3), and that we and should not commit any further
- * transactions.
+ * transactions.
*/
static inline int is_journal_aborted(journal_t *journal)
#define BJ_LogCtl 7 /* Buffer contains log descriptors */
#define BJ_Reserved 8 /* Buffer is reserved for access by journal */
#define BJ_Types 9
-
+
extern int jbd_blocks_per_page(struct inode *inode);
#ifdef __KERNEL__
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff