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[XFS] Kill direct access to ->count in valusema(); all we ever use it for 

is check if semaphore is actually locked, which can be trivially done in
portable way. Code gets more reabable, while we are at it... 

SGI-PV: 953915
SGI-Modid: xfs-linux-melb:xfs-kern:26274a

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Al Viro 2006-06-19 08:41:30 +10:00 committed by Nathan Scott
parent a805bad5da
commit 0d8fee3270
6 changed files with 20 additions and 19 deletions
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19
fs/xfs/linux-2.6/sema.h
View File

@ -34,20 +34,21 @@ typedef struct semaphore sema_t;
#define initnsema(sp, val, name) sema_init(sp, val)
#define psema(sp, b) down(sp)
#define vsema(sp) up(sp)
#define valusema(sp) (atomic_read(&(sp)->count))
#define freesema(sema)
#define freesema(sema) do { } while (0)
static inline int issemalocked(sema_t *sp)
{
return down_trylock(sp) || (up(sp), 0);
}
/*
* Map cpsema (try to get the sema) to down_trylock. We need to switch
* the return values since cpsema returns 1 (acquired) 0 (failed) and
* down_trylock returns the reverse 0 (acquired) 1 (failed).
*/
#define cpsema(sp) (down_trylock(sp) ? 0 : 1)
/*
* Didn't do cvsema(sp). Not sure how to map this to up/down/...
* It does a vsema if the values is < 0 other wise nothing.
*/
static inline int cpsema(sema_t *sp)
{
return down_trylock(sp) ? 0 : 1;
}
#endif /* __XFS_SUPPORT_SEMA_H__ */

4
fs/xfs/quota/xfs_dquot.h
View File

@ -119,7 +119,7 @@ XFS_DQ_IS_LOCKED(xfs_dquot_t *dqp)
*/
#define xfs_dqflock(dqp) { psema(&((dqp)->q_flock), PINOD | PRECALC);\
(dqp)->dq_flags |= XFS_DQ_FLOCKED; }
#define xfs_dqfunlock(dqp) { ASSERT(valusema(&((dqp)->q_flock)) <= 0); \
#define xfs_dqfunlock(dqp) { ASSERT(issemalocked(&((dqp)->q_flock))); \
vsema(&((dqp)->q_flock)); \
(dqp)->dq_flags &= ~(XFS_DQ_FLOCKED); }
@ -128,7 +128,7 @@ XFS_DQ_IS_LOCKED(xfs_dquot_t *dqp)
#define XFS_DQ_PINUNLOCK(dqp, s) mutex_spinunlock( \
&(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s)
#define XFS_DQ_IS_FLUSH_LOCKED(dqp) (valusema(&((dqp)->q_flock)) <= 0)
#define XFS_DQ_IS_FLUSH_LOCKED(dqp) (issemalocked(&((dqp)->q_flock)))
#define XFS_DQ_IS_ON_FREELIST(dqp) ((dqp)->dq_flnext != (dqp))
#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)

4
fs/xfs/quota/xfs_dquot_item.c
View File

@ -248,7 +248,7 @@ xfs_qm_dquot_logitem_pushbuf(
* inode flush completed and the inode was taken off the AIL.
* So, just get out.
*/
if ((valusema(&(dqp->q_flock)) > 0) ||
if (!issemalocked(&(dqp->q_flock)) ||
((qip->qli_item.li_flags & XFS_LI_IN_AIL) == 0)) {
qip->qli_pushbuf_flag = 0;
xfs_dqunlock(dqp);
@ -261,7 +261,7 @@ xfs_qm_dquot_logitem_pushbuf(
if (bp != NULL) {
if (XFS_BUF_ISDELAYWRITE(bp)) {
dopush = ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
(valusema(&(dqp->q_flock)) <= 0));
issemalocked(&(dqp->q_flock)));
qip->qli_pushbuf_flag = 0;
xfs_dqunlock(dqp);

2
fs/xfs/xfs_iget.c
View File

@ -1031,6 +1031,6 @@ xfs_iflock_nowait(xfs_inode_t *ip)
void
xfs_ifunlock(xfs_inode_t *ip)
{
ASSERT(valusema(&(ip->i_flock)) <= 0);
ASSERT(issemalocked(&(ip->i_flock)));
vsema(&(ip->i_flock));
}

4
fs/xfs/xfs_inode.c
View File

@ -3015,7 +3015,7 @@ xfs_iflush(
XFS_STATS_INC(xs_iflush_count);
ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE|MR_ACCESS));
ASSERT(valusema(&ip->i_flock) <= 0);
ASSERT(issemalocked(&(ip->i_flock)));
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
ip->i_d.di_nextents > ip->i_df.if_ext_max);
@ -3273,7 +3273,7 @@ xfs_iflush_int(
SPLDECL(s);
ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE|MR_ACCESS));
ASSERT(valusema(&ip->i_flock) <= 0);
ASSERT(issemalocked(&(ip->i_flock)));
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
ip->i_d.di_nextents > ip->i_df.if_ext_max);

6
fs/xfs/xfs_inode_item.c
View File

@ -794,7 +794,7 @@ xfs_inode_item_pushbuf(
* inode flush completed and the inode was taken off the AIL.
* So, just get out.
*/
if ((valusema(&(ip->i_flock)) > 0) ||
if (!issemalocked(&(ip->i_flock)) ||
((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
iip->ili_pushbuf_flag = 0;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
@ -816,7 +816,7 @@ xfs_inode_item_pushbuf(
* If not, we can flush it async.
*/
dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
(valusema(&(ip->i_flock)) <= 0));
issemalocked(&(ip->i_flock)));
iip->ili_pushbuf_flag = 0;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
xfs_buftrace("INODE ITEM PUSH", bp);
@ -864,7 +864,7 @@ xfs_inode_item_push(
ip = iip->ili_inode;
ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
ASSERT(valusema(&(ip->i_flock)) <= 0);
ASSERT(issemalocked(&(ip->i_flock)));
/*
* Since we were able to lock the inode's flush lock and
* we found it on the AIL, the inode must be dirty. This