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xfs: make the log ticket ID available outside the log infrastructure

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The ticket ID is needed to uniquely identify transactions when doing busy
extent matching. Delayed logging changes the lifecycle of busy extents with
respect to the transaction structure lifecycle. Hence we can no longer use
the transaction structure as a means of determining the owner of the busy
extent as it may be freed and reused while the busy extent is still active.

This commit provides the infrastructure to access the xlog_tid_t held in the
ticket from a transaction handle. This avoids the need for callers to peek
into the transaction and log structures to find this out.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-05-14 21:41:46 +10:00 committed by Alex Elder
parent 169a7b078e
commit 955833cf2a
4 changed files with 12 additions and 3 deletions
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7
fs/xfs/xfs_log.c
View file

@ -3312,6 +3312,13 @@ xfs_log_ticket_get(
return ticket;
}
xlog_tid_t
xfs_log_get_trans_ident(
struct xfs_trans *tp)
{
return tp->t_ticket->t_tid;
}
/*
* Allocate and initialise a new log ticket.
*/

4
fs/xfs/xfs_log.h
View file

@ -19,7 +19,6 @@
#define __XFS_LOG_H__
/* get lsn fields */
#define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
#define BLOCK_LSN(lsn) ((uint)(lsn))
@ -134,6 +133,7 @@ struct xlog_in_core;
struct xlog_ticket;
struct xfs_log_item;
struct xfs_item_ops;
struct xfs_trans;
void xfs_log_item_init(struct xfs_mount *mp,
struct xfs_log_item *item,
@ -190,6 +190,8 @@ void xlog_iodone(struct xfs_buf *);
struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
void xfs_log_ticket_put(struct xlog_ticket *ticket);
xlog_tid_t xfs_log_get_trans_ident(struct xfs_trans *tp);
#endif

2
fs/xfs/xfs_log_priv.h
View file

@ -152,8 +152,6 @@ static inline uint xlog_get_client_id(__be32 i)
#define XLOG_RECOVERY_NEEDED 0x4 /* log was recovered */
#define XLOG_IO_ERROR 0x8 /* log hit an I/O error, and being
shutdown */
typedef __uint32_t xlog_tid_t;
#ifdef __KERNEL__
/*

2
fs/xfs/xfs_types.h
View file

@ -75,6 +75,8 @@ typedef __uint32_t xfs_dahash_t; /* dir/attr hash value */
typedef __uint16_t xfs_prid_t; /* prid_t truncated to 16bits in XFS */
typedef __uint32_t xlog_tid_t; /* transaction ID type */
/*
* These types are 64 bits on disk but are either 32 or 64 bits in memory.
* Disk based types: