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xfs: rework log grant space calculations

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The log grant space calculations are repeated for both write and
reserve grant heads. To make it simpler to convert the calculations
toa different algorithm, factor them so both the gratn heads use the
same calculation functions. Once this is done we can drop the
wrappers that are used in only a couple of place to update both
grant heads at once as they don't provide any particular value.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-12-21 12:06:05 +11:00 committed by Dave Chinner
parent 3f336c6fa1
commit 663e496a72
1 changed files with 48 additions and 47 deletions
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95
fs/xfs/xfs_log.c
View file

@ -98,53 +98,34 @@ STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
STATIC int xlog_iclogs_empty(xlog_t *log);
static void
xlog_grant_sub_space(struct log *log, int bytes)
xlog_grant_sub_space(
struct log *log,
int *cycle,
int *space,
int bytes)
{
log->l_grant_write_bytes -= bytes;
if (log->l_grant_write_bytes < 0) {
log->l_grant_write_bytes += log->l_logsize;
log->l_grant_write_cycle--;
}
log->l_grant_reserve_bytes -= bytes;
if ((log)->l_grant_reserve_bytes < 0) {
log->l_grant_reserve_bytes += log->l_logsize;
log->l_grant_reserve_cycle--;
}
}
static void
xlog_grant_add_space_write(struct log *log, int bytes)
{
int tmp = log->l_logsize - log->l_grant_write_bytes;
if (tmp > bytes)
log->l_grant_write_bytes += bytes;
else {
log->l_grant_write_cycle++;
log->l_grant_write_bytes = bytes - tmp;
*space -= bytes;
if (*space < 0) {
*space += log->l_logsize;
(*cycle)--;
}
}
static void
xlog_grant_add_space_reserve(struct log *log, int bytes)
xlog_grant_add_space(
struct log *log,
int *cycle,
int *space,
int bytes)
{
int tmp = log->l_logsize - log->l_grant_reserve_bytes;
int tmp = log->l_logsize - *space;
if (tmp > bytes)
log->l_grant_reserve_bytes += bytes;
*space += bytes;
else {
log->l_grant_reserve_cycle++;
log->l_grant_reserve_bytes = bytes - tmp;
*space = bytes - tmp;
(*cycle)++;
}
}
static inline void
xlog_grant_add_space(struct log *log, int bytes)
{
xlog_grant_add_space_write(log, bytes);
xlog_grant_add_space_reserve(log, bytes);
}
static void
xlog_tic_reset_res(xlog_ticket_t *tic)
{
@ -1344,7 +1325,10 @@ xlog_sync(xlog_t *log,
/* move grant heads by roundoff in sync */
spin_lock(&log->l_grant_lock);
xlog_grant_add_space(log, roundoff);
xlog_grant_add_space(log, &log->l_grant_reserve_cycle,
&log->l_grant_reserve_bytes, roundoff);
xlog_grant_add_space(log, &log->l_grant_write_cycle,
&log->l_grant_write_bytes, roundoff);
spin_unlock(&log->l_grant_lock);
/* put cycle number in every block */
@ -2574,7 +2558,10 @@ redo:
list_del_init(&tic->t_queue);
/* we've got enough space */
xlog_grant_add_space(log, need_bytes);
xlog_grant_add_space(log, &log->l_grant_reserve_cycle,
&log->l_grant_reserve_bytes, need_bytes);
xlog_grant_add_space(log, &log->l_grant_write_cycle,
&log->l_grant_write_bytes, need_bytes);
trace_xfs_log_grant_exit(log, tic);
xlog_verify_grant_head(log, 1);
xlog_verify_grant_tail(log);
@ -2701,7 +2688,8 @@ redo:
list_del_init(&tic->t_queue);
/* we've got enough space */
xlog_grant_add_space_write(log, need_bytes);
xlog_grant_add_space(log, &log->l_grant_write_cycle,
&log->l_grant_write_bytes, need_bytes);
trace_xfs_log_regrant_write_exit(log, tic);
xlog_verify_grant_head(log, 1);
xlog_verify_grant_tail(log);
@ -2742,7 +2730,12 @@ xlog_regrant_reserve_log_space(xlog_t *log,
ticket->t_cnt--;
spin_lock(&log->l_grant_lock);
xlog_grant_sub_space(log, ticket->t_curr_res);
xlog_grant_sub_space(log, &log->l_grant_reserve_cycle,
&log->l_grant_reserve_bytes,
ticket->t_curr_res);
xlog_grant_sub_space(log, &log->l_grant_write_cycle,
&log->l_grant_write_bytes,
ticket->t_curr_res);
ticket->t_curr_res = ticket->t_unit_res;
xlog_tic_reset_res(ticket);
@ -2756,7 +2749,9 @@ xlog_regrant_reserve_log_space(xlog_t *log,
return;
}
xlog_grant_add_space_reserve(log, ticket->t_unit_res);
xlog_grant_add_space(log, &log->l_grant_reserve_cycle,
&log->l_grant_reserve_bytes,
ticket->t_unit_res);
trace_xfs_log_regrant_reserve_exit(log, ticket);
@ -2785,24 +2780,30 @@ STATIC void
xlog_ungrant_log_space(xlog_t *log,
xlog_ticket_t *ticket)
{
int bytes;
if (ticket->t_cnt > 0)
ticket->t_cnt--;
spin_lock(&log->l_grant_lock);
trace_xfs_log_ungrant_enter(log, ticket);
xlog_grant_sub_space(log, ticket->t_curr_res);
trace_xfs_log_ungrant_sub(log, ticket);
/* If this is a permanent reservation ticket, we may be able to free
/*
* If this is a permanent reservation ticket, we may be able to free
* up more space based on the remaining count.
*/
bytes = ticket->t_curr_res;
if (ticket->t_cnt > 0) {
ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV);
xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt);
bytes += ticket->t_unit_res*ticket->t_cnt;
}
xlog_grant_sub_space(log, &log->l_grant_reserve_cycle,
&log->l_grant_reserve_bytes, bytes);
xlog_grant_sub_space(log, &log->l_grant_write_cycle,
&log->l_grant_write_bytes, bytes);
trace_xfs_log_ungrant_exit(log, ticket);
xlog_verify_grant_head(log, 1);