/*
* This is the inode flushing I/O completion routine. It is called
* from interrupt level when the buffer containing the inode is
* flushed to disk. It is responsible for removing the inode item
* from the AIL if it has not been re-logged, and unlocking the inode's
* flush lock.
*
* To reduce AIL lock traffic as much as possible, we scan the buffer log item
* list for other inodes that will run this function. We remove them from the
* buffer list so we can process all the inode IO completions in one AIL lock
* traversal.
*/
void
xfs_iflush_done(
struct xfs_buf *bp,
struct xfs_log_item *lip)
{
struct xfs_inode_log_item *iip;
struct xfs_log_item *blip;
struct xfs_log_item *next;
struct xfs_log_item *prev;
struct xfs_ail *ailp = lip->li_ailp;
int need_ail = 0;
/*
* Scan the buffer IO completions for other inodes being completed and
* attach them to the current inode log item.
*/
blip = bp->b_fspriv;
prev = NULL;
while (blip != NULL) {
if (lip->li_cb != xfs_iflush_done) {
prev = blip;
blip = blip->li_bio_list;
continue;
}
/* remove from list */
next = blip->li_bio_list;
if (!prev) {
bp->b_fspriv = next;
} else {
prev->li_bio_list = next;
}
/* add to current list */
blip->li_bio_list = lip->li_bio_list;
lip->li_bio_list = blip;
/*
* while we have the item, do the unlocked check for needing
* the AIL lock.
*/
iip = INODE_ITEM(blip);
if (iip->ili_logged && blip->li_lsn == iip->ili_flush_lsn)
need_ail++;
blip = next;
}
/* make sure we capture the state of the initial inode. */
iip = INODE_ITEM(lip);
if (iip->ili_logged && lip->li_lsn == iip->ili_flush_lsn)
need_ail++;
/*
* We only want to pull the item from the AIL if it is
* actually there and its location in the log has not
* changed since we started the flush. Thus, we only bother
* if the ili_logged flag is set and the inode's lsn has not
* changed. First we check the lsn outside
* the lock since it's cheaper, and then we recheck while
* holding the lock before removing the inode from the AIL.
*/
if (need_ail) {
struct xfs_log_item *log_items[need_ail];
int i = 0;
spin_lock(&ailp->xa_lock);
for (blip = lip; blip; blip = blip->li_bio_list) {
iip = INODE_ITEM(blip);
if (iip->ili_logged &&
blip->li_lsn == iip->ili_flush_lsn) {
log_items[i++] = blip;
}
ASSERT(i <= need_ail);
}
/* xfs_trans_ail_delete_bulk() drops the AIL lock. */
xfs_trans_ail_delete_bulk(ailp, log_items, i);
}
/*
* clean up and unlock the flush lock now we are done. We can clear the
* ili_last_fields bits now that we know that the data corresponding to
* them is safely on disk.
*/
for (blip = lip; blip; blip = next) {
next = blip->li_bio_list;
blip->li_bio_list = NULL;
iip = INODE_ITEM(blip);
iip->ili_logged = 0;
iip->ili_last_fields = 0;
xfs_ifunlock(iip->ili_inode);
}
}
void
xfs_iflush_done(
struct xfs_buf *bp,
struct xfs_log_item *lip)
{
struct xfs_inode_log_item *iip;
struct xfs_log_item *blip;
struct xfs_log_item *next;
struct xfs_log_item *prev;
struct xfs_ail *ailp = lip->li_ailp;
int need_ail = 0;
/*
*/
blip = bp->b_fspriv;
prev = NULL;
while (blip != NULL) {
if (lip->li_cb != xfs_iflush_done) {
prev = blip;
blip = blip->li_bio_list;
continue;
}
/* */
next = blip->li_bio_list;
if (!prev) {
bp->b_fspriv = next;
} else {
prev->li_bio_list = next;
}
/* */
blip->li_bio_list = lip->li_bio_list;
lip->li_bio_list = blip;
/*
*/
iip = INODE_ITEM(blip);
if (iip->ili_logged && blip->li_lsn == iip->ili_flush_lsn)
need_ail++;
blip = next;
}
/* */
iip = INODE_ITEM(lip);
if (iip->ili_logged && lip->li_lsn == iip->ili_flush_lsn)
need_ail++;
/*
*/
if (need_ail) {
struct xfs_log_item *log_items[need_ail];
int i = 0;
spin_lock(&ailp->xa_lock);
for (blip = lip; blip; blip = blip->li_bio_list) {
iip = INODE_ITEM(blip);
if (iip->ili_logged &&
blip->li_lsn == iip->ili_flush_lsn) {
log_items[i++] = blip;
}
ASSERT(i <= need_ail);
}
/* */
xfs_trans_ail_delete_bulk(ailp, log_items, i);
}
/*
*/
for (blip = lip; blip; blip = next) {
next = blip->li_bio_list;
blip->li_bio_list = NULL;
iip = INODE_ITEM(blip);
iip->ili_logged = 0;
iip->ili_last_fields = 0;
xfs_ifunlock(iip->ili_inode);
}
}
