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xfs: convert log grant heads to atomic variables

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Convert the log grant heads to atomic64_t types in preparation for
converting the accounting algorithms to atomic operations. his patch
just converts the variables; the algorithmic changes are in a
separate patch for clarity.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-12-04 00:02:40 +11:00 committed by Dave Chinner
parent 1c3cb9ec07
commit c8a09ff8ca
2 changed files with 10 additions and 10 deletions
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8
fs/xfs/xfs_log.c
View File

@ -47,7 +47,7 @@ STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp,
xfs_buftarg_t *log_target, xfs_buftarg_t *log_target,
xfs_daddr_t blk_offset, xfs_daddr_t blk_offset,
int num_bblks); int num_bblks);
STATIC int xlog_space_left(struct log *log, int64_t *head); STATIC int xlog_space_left(struct log *log, atomic64_t *head);
STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog);
STATIC void xlog_dealloc_log(xlog_t *log); STATIC void xlog_dealloc_log(xlog_t *log);
@ -100,7 +100,7 @@ STATIC int xlog_iclogs_empty(xlog_t *log);
static void static void
xlog_grant_sub_space( xlog_grant_sub_space(
struct log *log, struct log *log,
int64_t *head, atomic64_t *head,
int bytes) int bytes)
{ {
int cycle, space; int cycle, space;
@ -119,7 +119,7 @@ xlog_grant_sub_space(
static void static void
xlog_grant_add_space( xlog_grant_add_space(
struct log *log, struct log *log,
int64_t *head, atomic64_t *head,
int bytes) int bytes)
{ {
int tmp; int tmp;
@ -816,7 +816,7 @@ xlog_assign_tail_lsn(
STATIC int STATIC int
xlog_space_left( xlog_space_left(
struct log *log, struct log *log,
int64_t *head) atomic64_t *head)
{ {
int free_bytes; int free_bytes;
int tail_bytes; int tail_bytes;

12
fs/xfs/xfs_log_priv.h
View File

@ -514,8 +514,8 @@ typedef struct log {
spinlock_t l_grant_lock ____cacheline_aligned_in_smp; spinlock_t l_grant_lock ____cacheline_aligned_in_smp;
struct list_head l_reserveq; struct list_head l_reserveq;
struct list_head l_writeq; struct list_head l_writeq;
int64_t l_grant_reserve_head; atomic64_t l_grant_reserve_head;
int64_t l_grant_write_head; atomic64_t l_grant_write_head;
/* /*
* l_last_sync_lsn and l_tail_lsn are atomics so they can be set and * l_last_sync_lsn and l_tail_lsn are atomics so they can be set and
@ -596,18 +596,18 @@ xlog_assign_atomic_lsn(atomic64_t *lsn, uint cycle, uint block)
* will always get consistent component values to work from. * will always get consistent component values to work from.
*/ */
static inline void static inline void
xlog_crack_grant_head(int64_t *head, int *cycle, int *space) xlog_crack_grant_head(atomic64_t *head, int *cycle, int *space)
{ {
int64_t val = *head; int64_t val = atomic64_read(head);
*cycle = val >> 32; *cycle = val >> 32;
*space = val & 0xffffffff; *space = val & 0xffffffff;
} }
static inline void static inline void
xlog_assign_grant_head(int64_t *head, int cycle, int space) xlog_assign_grant_head(atomic64_t *head, int cycle, int space)
{ {
*head = ((int64_t)cycle << 32) | space; atomic64_set(head, ((int64_t)cycle << 32) | space);
} }
/* /*