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xfs: simplify xfs_trans_ijoin* again

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There is no reason to keep a reference to the inode even if we unlock
it during transaction commit because we never drop a reference between
the ijoin and commit.  Also use this fact to merge xfs_trans_ijoin_ref
back into xfs_trans_ijoin - the third argument decides if an unlock
is needed now.

I'm actually starting to wonder if allowing inodes to be unlocked
at transaction commit really is worth the effort.  The only real
benefit is that they can be unlocked earlier when commiting a
synchronous transactions, but that could be solved by doing the
log force manually after the unlock, too.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-09-19 15:00:54 +00:00 • committed by Alex Elder
parent 23bb0be1a2
commit ddc3415aba
18 changed files with 65 additions and 83 deletions
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25
fs/xfs/xfs_trans_inode.c
View file

@ -47,11 +47,13 @@ xfs_trans_inode_broot_debug(
* Add a locked inode to the transaction.
*
* The inode must be locked, and it cannot be associated with any transaction.
* If lock_flags is non-zero the inode will be unlocked on transaction commit.
*/
void
xfs_trans_ijoin(
struct xfs_trans *tp,
struct xfs_inode *ip)
struct xfs_inode *ip,
uint lock_flags)
{
xfs_inode_log_item_t *iip;
@ -59,7 +61,9 @@ xfs_trans_ijoin(
if (ip->i_itemp == NULL)
xfs_inode_item_init(ip, ip->i_mount);
iip = ip->i_itemp;
ASSERT(iip->ili_lock_flags == 0);
iip->ili_lock_flags = lock_flags;
/*
* Get a log_item_desc to point at the new item.
@ -69,25 +73,6 @@ xfs_trans_ijoin(
xfs_trans_inode_broot_debug(ip);
}
/*
* Add a locked inode to the transaction.
*
*
* Grabs a reference to the inode which will be dropped when the transaction
* is committed. The inode will also be unlocked at that point. The inode
* must be locked, and it cannot be associated with any transaction.
*/
void
xfs_trans_ijoin_ref(
struct xfs_trans *tp,
struct xfs_inode *ip,
uint lock_flags)
{
xfs_trans_ijoin(tp, ip);
IHOLD(ip);
ip->i_itemp->ili_lock_flags = lock_flags;
}
/*
* Transactional inode timestamp update. Requires the inode to be locked and
* joined to the transaction supplied. Relies on the transaction subsystem to