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xfs: share code for grant head wakeups 

Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2012-02-20 02:31:29 +00:00 committed by Ben Myers
parent 23ee3df349
commit e179840d74
2 changed files with 20 additions and 31 deletions
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50
fs/xfs/xfs_log.c
View File

@ -171,49 +171,39 @@ xlog_grant_head_wake_all(
spin_unlock(&head->lock);
}
STATIC bool
xlog_reserveq_wake(
static inline int
xlog_ticket_reservation(
struct log *log,
int *free_bytes)
struct xlog_grant_head *head,
struct xlog_ticket *tic)
{
struct xlog_ticket *tic;
int need_bytes;
list_for_each_entry(tic, &log->l_reserve_head.waiters, t_queue) {
if (head == &log->l_write_head) {
ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
return tic->t_unit_res;
} else {
if (tic->t_flags & XLOG_TIC_PERM_RESERV)
need_bytes = tic->t_unit_res * tic->t_cnt;
return tic->t_unit_res * tic->t_cnt;
else
need_bytes = tic->t_unit_res;
if (*free_bytes < need_bytes)
return false;
*free_bytes -= need_bytes;
trace_xfs_log_grant_wake_up(log, tic);
wake_up_process(tic->t_task);
return tic->t_unit_res;
}
return true;
}
STATIC bool
xlog_writeq_wake(
xlog_grant_head_wake(
struct log *log,
struct xlog_grant_head *head,
int *free_bytes)
{
struct xlog_ticket *tic;
int need_bytes;
list_for_each_entry(tic, &log->l_write_head.waiters, t_queue) {
ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
need_bytes = tic->t_unit_res;
list_for_each_entry(tic, &head->waiters, t_queue) {
need_bytes = xlog_ticket_reservation(log, head, tic);
if (*free_bytes < need_bytes)
return false;
*free_bytes -= need_bytes;
trace_xfs_log_regrant_write_wake_up(log, tic);
*free_bytes -= need_bytes;
trace_xfs_log_grant_wake_up(log, tic);
wake_up_process(tic->t_task);
}
@ -772,7 +762,7 @@ xfs_log_space_wake(
spin_lock(&log->l_write_head.lock);
free_bytes = xlog_space_left(log, &log->l_write_head.grant);
xlog_writeq_wake(log, &free_bytes);
xlog_grant_head_wake(log, &log->l_write_head, &free_bytes);
spin_unlock(&log->l_write_head.lock);
}
@ -781,7 +771,7 @@ xfs_log_space_wake(
spin_lock(&log->l_reserve_head.lock);
free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
xlog_reserveq_wake(log, &free_bytes);
xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes);
spin_unlock(&log->l_reserve_head.lock);
}
}
@ -2562,7 +2552,7 @@ xlog_grant_log_space(
free_bytes = xlog_space_left(log, &log->l_reserve_head.grant);
if (!list_empty_careful(&log->l_reserve_head.waiters)) {
spin_lock(&log->l_reserve_head.lock);
if (!xlog_reserveq_wake(log, &free_bytes) ||
if (!xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes) ||
free_bytes < need_bytes) {
error = xlog_grant_head_wait(log, &log->l_reserve_head,
tic, need_bytes);
@ -2618,7 +2608,7 @@ xlog_regrant_write_log_space(
free_bytes = xlog_space_left(log, &log->l_write_head.grant);
if (!list_empty_careful(&log->l_write_head.waiters)) {
spin_lock(&log->l_write_head.lock);
if (!xlog_writeq_wake(log, &free_bytes) ||
if (!xlog_grant_head_wake(log, &log->l_write_head, &free_bytes) ||
free_bytes < need_bytes) {
error = xlog_grant_head_wait(log, &log->l_write_head,
tic, need_bytes);

1
fs/xfs/xfs_trace.h
View File

@ -837,7 +837,6 @@ DEFINE_LOGGRANT_EVENT(xfs_log_grant_wake_up);
DEFINE_LOGGRANT_EVENT(xfs_log_regrant_write_enter);
DEFINE_LOGGRANT_EVENT(xfs_log_regrant_write_exit);
DEFINE_LOGGRANT_EVENT(xfs_log_regrant_write_error);
DEFINE_LOGGRANT_EVENT(xfs_log_regrant_write_wake_up);
DEFINE_LOGGRANT_EVENT(xfs_log_regrant_reserve_enter);
DEFINE_LOGGRANT_EVENT(xfs_log_regrant_reserve_exit);
DEFINE_LOGGRANT_EVENT(xfs_log_regrant_reserve_sub);