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xfs: Refactor xfs_ticket_alloc() to extract a new helper 

Refactor xlog_ticket_alloc() to extract a new helper, i.e.
xfs_log_calc_unit_res().

This helper would be used to calculate the total log reservation
size by adding extra log operation/transation headers for a new
log ticket.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
wifi-calibration
Jie Liu 2013-08-12 20:50:01 +10:00 committed by Ben Myers
parent f749278c5a
commit e773fc934f
2 changed files with 42 additions and 22 deletions
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60
fs/xfs/xfs_log.c
View File

@ -3391,24 +3391,17 @@ xfs_log_ticket_get(
}
/*
* Allocate and initialise a new log ticket.
* Figure out the total log space unit (in bytes) that would be
* required for a log ticket.
*/
struct xlog_ticket *
xlog_ticket_alloc(
struct xlog *log,
int unit_bytes,
int cnt,
char client,
bool permanent,
xfs_km_flags_t alloc_flags)
int
xfs_log_calc_unit_res(
struct xfs_mount *mp,
int unit_bytes)
{
struct xlog_ticket *tic;
uint num_headers;
int iclog_space;
tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags);
if (!tic)
return NULL;
struct xlog *log = mp->m_log;
int iclog_space;
uint num_headers;
/*
* Permanent reservations have up to 'cnt'-1 active log operations
@ -3483,20 +3476,43 @@ xlog_ticket_alloc(
unit_bytes += log->l_iclog_hsize;
/* for roundoff padding for transaction data and one for commit record */
if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
log->l_mp->m_sb.sb_logsunit > 1) {
if (xfs_sb_version_haslogv2(&mp->m_sb) && mp->m_sb.sb_logsunit > 1) {
/* log su roundoff */
unit_bytes += 2*log->l_mp->m_sb.sb_logsunit;
unit_bytes += 2 * mp->m_sb.sb_logsunit;
} else {
/* BB roundoff */
unit_bytes += 2*BBSIZE;
unit_bytes += 2 * BBSIZE;
}
return unit_bytes;
}
/*
* Allocate and initialise a new log ticket.
*/
struct xlog_ticket *
xlog_ticket_alloc(
struct xlog *log,
int unit_bytes,
int cnt,
char client,
bool permanent,
xfs_km_flags_t alloc_flags)
{
struct xlog_ticket *tic;
int unit_res;
tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags);
if (!tic)
return NULL;
unit_res = xfs_log_calc_unit_res(log->l_mp, unit_bytes);
atomic_set(&tic->t_ref, 1);
tic->t_task = current;
INIT_LIST_HEAD(&tic->t_queue);
tic->t_unit_res = unit_bytes;
tic->t_curr_res = unit_bytes;
tic->t_unit_res = unit_res;
tic->t_curr_res = unit_res;
tic->t_cnt = cnt;
tic->t_ocnt = cnt;
tic->t_tid = prandom_u32();

4
fs/xfs/xfs_log_format.h
View File

@ -18,6 +18,8 @@
#ifndef __XFS_LOG_FORMAT_H__
#define __XFS_LOG_FORMAT_H__
struct xfs_mount;
/*
* On-disk Log Format definitions.
*
@ -834,4 +836,6 @@ struct xfs_icreate_log {
__be32 icl_gen; /* inode generation number to use */
};
int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
#endif /* __XFS_LOG_FORMAT_H__ */