.\" This documentation was generated from the book titled "The Linux Journalling API", which is part of the Linux kernel source.
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.\" Documentation by: Roger Gammans (rgammans@computer-surgery.co.uk)
.\" Documentation by: Stephen Tweedie (sct@redhat.com)
.\" Documentation copyright: 2002 Roger Gammans 
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.TH "JOURNAL_S" "9" "13 April 2004" "" ""

.SH NAME
struct journal_s \- The journal_s type is the concrete type associated with
.SH SYNOPSIS

.nf
struct journal_s {
  unsigned long  j_flags;
  struct buffer_head * j_sb_buffer;
  journal_superblock_t * j_superblock;
  int j_format_version;
  struct semaphore j_barrier;
  /** 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_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;
  unsigned long  j_last;
  /** Device, blocksize and starting block offset for the location where we* store the journal.*/struct block_device * j_dev;
  int j_blocksize;
  unsigned int  j_blk_offset;
  /** Device which holds the client fs.  For internal journal this will be* equal to j_dev.*/struct block_device * j_fs_dev;
  unsigned int  j_maxlen;
  struct inode  * j_inode;
  struct task_struct * j_task;
  /** Maximum number of metadata buffers to allow in a single compound* commit transaction*/int   j_max_transaction_buffers;
  /** What is the maximum transaction lifetime before we begin a commit?*/unsigned long  j_commit_interval;
  struct timer_list * j_commit_timer;
  struct jbd_revoke_table_s * j_revoke;
};  
.fi
.SH "MEMBERS"
.TP
\fBj_flags\fR
General journaling state flags
.TP
\fBj_sb_buffer\fR
First part of superblock buffer
.TP
\fBj_superblock\fR
Second part of superblock buffer
.TP
\fBj_format_version\fR
Version of the superblock format
.TP
\fBj_barrier\fR
The barrier lock itself
.TP
\fBj_wait_transaction_locked\fR
Wait queue for waiting for a locked transaction
to start committing, or for a barrier lock to be released
.TP
\fBj_wait_logspace\fR
Wait queue for waiting for checkpointing to complete
.TP
\fBj_wait_done_commit\fR
Wait queue for waiting for commit to complete 
.TP
\fBj_wait_checkpoint\fR
Wait queue to trigger checkpointing
.TP
\fBj_wait_commit\fR
Wait queue to trigger commit
.TP
\fBj_wait_updates\fR
Wait queue to wait for updates to complete
.TP
\fBj_checkpoint_sem\fR
Semaphore for locking against concurrent checkpoints
.TP
\fBj_last\fR
The block number one beyond the last usable block
.TP
\fBj_dev\fR
Device where we store the journal
.TP
\fBj_blocksize\fR
blocksize for the location where we store the journal.
.TP
\fBj_blk_offset\fR
starting block offset for into the device where we store the
journal
.TP
\fBj_fs_dev\fR
Device which holds the client fs.  For internal journal this will
be equal to j_dev
.TP
\fBj_maxlen\fR
Total maximum capacity of the journal region on disk.
.TP
\fBj_inode\fR
Optional inode where we store the journal.  If present, all journal
block numbers are mapped into this inode via \fBbmap\fR.
.TP
\fBj_task\fR
Pointer to the current commit thread for this journal
.TP
\fBj_max_transaction_buffers\fR
Maximum number of metadata buffers to allow in a
single compound commit transaction
.TP
\fBj_commit_interval\fR
What is the maximum transaction lifetime before we begin
a commit?
.TP
\fBj_commit_timer\fR
The timer used to wakeup the commit thread
.TP
\fBj_revoke\fR
The revoke table - maintains the list of revoked blocks in the
current transaction.
.SH "DESCRIPTION"
.PP
journal_t.
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation was generated with kernel version 2.6.1.