JOURNAL_S

NAME

SYNOPSIS

struct journal_s {
  unsigned long  j_flags;
  int j_errno;
  struct buffer_head * j_sb_buffer;
  journal_superblock_t * j_superblock;
  int j_format_version;
  int j_barrier_count;
  struct semaphore j_barrier;
  transaction_t *  j_running_transaction;
  transaction_t *  j_committing_transaction;
  transaction_t *  j_checkpoint_transactions;
  wait_queue_head_t j_wait_transaction_locked;
  wait_queue_head_t j_wait_logspace;
  wait_queue_head_t j_wait_done_commit;
  wait_queue_head_t j_wait_checkpoint;
  wait_queue_head_t j_wait_commit;
  wait_queue_head_t j_wait_updates;
  struct semaphore  j_checkpoint_sem;
  struct semaphore j_sem;
  unsigned long  j_head;
  unsigned long  j_tail;
  unsigned long  j_free;
  unsigned long  j_first, j_last;
  struct block_device * j_dev;
  int j_blocksize;
  unsigned int  j_blk_offset;
  struct block_device * j_fs_dev;
  unsigned int  j_maxlen;
  struct inode *  j_inode;
  tid_t j_tail_sequence;
  tid_t j_transaction_sequence;
  tid_t j_commit_sequence;
  tid_t j_commit_request;
  __u8 * j_uuid;
  struct task_struct * j_task;
  int j_max_transaction_buffers;
  unsigned long  j_commit_interval;
  struct timer_list * j_commit_timer;
  int j_commit_timer_active;
  struct list_head j_all_journals;
  struct jbd_revoke_table_s * j_revoke;
};  

MEMBERS

j_flags

General journaling state flags

j_errno

Is there an outstanding uncleared error on the journal (from a prior abort)?

j_sb_buffer

First part of superblock buffer

j_superblock

Second part of superblock buffer

j_format_version

Version of the superblock format

j_barrier_count

Number of processes waiting to create a barrier lock

j_barrier

The barrier lock itself

j_running_transaction

The current running transaction..

j_committing_transaction

the transaction we are pushing to disk

j_checkpoint_transactions

a linked circular list of all transactions waiting for checkpointing

j_wait_transaction_locked

Wait queue for waiting for a locked transaction to start committing, or for a barrier lock to be released

j_wait_logspace

Wait queue for waiting for checkpointing to complete

j_wait_done_commit

Wait queue for waiting for commit to complete

j_wait_checkpoint

Wait queue to trigger checkpointing

j_wait_commit

Wait queue to trigger commit

j_wait_updates

Wait queue to wait for updates to complete

j_checkpoint_sem

Semaphore for locking against concurrent checkpoints

j_sem

The main journal lock, used by lock_journal

j_head

Journal head - identifies the first unused block in the journal

j_tail

Journal tail - identifies the oldest still-used block in the journal.

j_free

Journal free - how many free blocks are there in the journal?

j_last

The block number one beyond the last usable block

j_dev

Device where we store the journal

j_blocksize

blocksize for the location where we store the journal.

j_blk_offset

starting block offset for into the device where we store the journal

j_fs_dev

Device which holds the client fs. For internal journal this will be equal to j_dev

j_maxlen

Total maximum capacity of the journal region on disk.

j_inode

Optional inode where we store the journal. If present, all journal block numbers are mapped into this inode via bmap.

j_tail_sequence

Sequence number of the oldest transaction in the log

j_transaction_sequence

Sequence number of the next transaction to grant

j_commit_sequence

Sequence number of the most recently committed transaction

j_commit_request

Sequence number of the most recent transaction wanting commit

j_uuid

Uuid of client object.

j_task

Pointer to the current commit thread for this journal

j_max_transaction_buffers

Maximum number of metadata buffers to allow in a single compound commit transaction

j_commit_interval

What is the maximum transaction lifetime before we begin a commit?

j_commit_timer

The timer used to wakeup the commit thread

j_commit_timer_active

Timer flag

j_all_journals

Link all journals together - system-wide

j_revoke

The revoke table - maintains the list of revoked blocks in the current transaction.

ABOUT THIS DOCUMENT

This documentation is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

For more details see the file COPYING in the source distribution of Linux.

If you have comments on the formatting of this manpage, then please contact Michael Still (mikal@stillhq.com).

This documentation was generated with kernel version 2.5.72.

Index

NAME

SYNOPSIS

MEMBERS

ABOUT THIS DOCUMENT