void
xfs_refcache_resize(int xfs_refcache_new_size)
{
int i;
xfs_inode_t *ip;
int iplist_index = 0;
xfs_inode_t **iplist;
int error;
/*
* If the new size is smaller than the current size,
* purge entries to create smaller cache, and
* reposition index if necessary.
* Don't bother if no refcache yet.
*/
if (xfs_refcache && (xfs_refcache_new_size < xfs_refcache_size)) {
iplist = (xfs_inode_t **)kmem_zalloc(XFS_REFCACHE_SIZE_MAX *
sizeof(xfs_inode_t *), KM_SLEEP);
spin_lock(&xfs_refcache_lock);
for (i = xfs_refcache_new_size; i < xfs_refcache_size; i++) {
ip = xfs_refcache[i];
if (ip != NULL) {
xfs_refcache[i] = NULL;
ip->i_refcache = NULL;
xfs_refcache_count--;
ASSERT(xfs_refcache_count >= 0);
iplist[iplist_index] = ip;
iplist_index++;
}
}
xfs_refcache_size = xfs_refcache_new_size;
/*
* Move index to beginning of cache if it's now past the end
*/
if (xfs_refcache_index >= xfs_refcache_new_size)
xfs_refcache_index = 0;
spin_unlock(&xfs_refcache_lock);
/*
* Now drop the inodes we collected.
*/
for (i = 0; i < iplist_index; i++) {
VOP_RELEASE(XFS_ITOV(iplist[i]), error);
VN_RELE(XFS_ITOV(iplist[i]));
}
kmem_free(iplist, XFS_REFCACHE_SIZE_MAX *
sizeof(xfs_inode_t *));
} else {
spin_lock(&xfs_refcache_lock);
xfs_refcache_size = xfs_refcache_new_size;
spin_unlock(&xfs_refcache_lock);
}
}
/*
* This is called from the XFS sync code to ensure that the refcache
* is emptied out over time. We purge a small number of entries with
* each call.
*/
void
xfs_refcache_purge_some(xfs_mount_t *mp)
{
int error, i;
xfs_inode_t *ip;
int iplist_index;
xfs_inode_t **iplist;
if ((xfs_refcache == NULL) || (xfs_refcache_count == 0)) {
return;
}
iplist_index = 0;
iplist = (xfs_inode_t **)kmem_zalloc(xfs_refcache_purge_count *
sizeof(xfs_inode_t *), KM_SLEEP);
spin_lock(&xfs_refcache_lock);
/*
* Store any inodes we find in the next several entries
* into the iplist array to be released after dropping
* the spinlock. We always start looking from the currently
* oldest place in the cache. We move the refcache index
* forward as we go so that we are sure to eventually clear
* out the entire cache when the system goes idle.
*/
for (i = 0; i < xfs_refcache_purge_count; i++) {
ip = xfs_refcache[xfs_refcache_index];
if (ip != NULL) {
xfs_refcache[xfs_refcache_index] = NULL;
ip->i_refcache = NULL;
xfs_refcache_count--;
ASSERT(xfs_refcache_count >= 0);
iplist[iplist_index] = ip;
iplist_index++;
}
xfs_refcache_index++;
if (xfs_refcache_index == xfs_refcache_size) {
xfs_refcache_index = 0;
}
}
spin_unlock(&xfs_refcache_lock);
/*
* Now drop the inodes we collected.
*/
for (i = 0; i < iplist_index; i++) {
VOP_RELEASE(XFS_ITOV(iplist[i]), error);
VN_RELE(XFS_ITOV(iplist[i]));
}
kmem_free(iplist, xfs_refcache_purge_count *
sizeof(xfs_inode_t *));
}
STATIC int
xfs_file_release(
struct inode *inode,
struct file *filp)
{
vnode_t *vp = vn_from_inode(inode);
int error = 0;
if (vp)
VOP_RELEASE(vp, error);
return -error;
}
STATIC int
linvfs_release(
struct inode *inode,
struct file *filp)
{
vnode_t *vp = LINVFS_GET_VP(inode);
int error = 0;
if (vp)
VOP_RELEASE(vp, error);
return -error;
}
void
xfs_refcache_iunlock(
xfs_inode_t *ip,
uint lock_flags)
{
xfs_inode_t *release_ip;
int error;
release_ip = ip->i_release;
ip->i_release = NULL;
xfs_iunlock(ip, lock_flags);
if (release_ip != NULL) {
VOP_RELEASE(XFS_ITOV(release_ip), error);
VN_RELE(XFS_ITOV(release_ip));
}
}
/*
* This is called from the XFS unmount code to purge all entries for the
* given mount from the cache. It uses the refcache busy counter to
* make sure that new entries are not added to the cache as we purge them.
*/
void
xfs_refcache_purge_mp(
xfs_mount_t *mp)
{
vnode_t *vp;
int error, i;
xfs_inode_t *ip;
if (xfs_refcache == NULL) {
return;
}
spin_lock(&xfs_refcache_lock);
/*
* Bumping the busy counter keeps new entries from being added
* to the cache. We use a counter since multiple unmounts could
* be in here simultaneously.
*/
xfs_refcache_busy++;
for (i = 0; i < xfs_refcache_size; i++) {
ip = xfs_refcache[i];
if ((ip != NULL) && (ip->i_mount == mp)) {
xfs_refcache[i] = NULL;
ip->i_refcache = NULL;
xfs_refcache_count--;
ASSERT(xfs_refcache_count >= 0);
spin_unlock(&xfs_refcache_lock);
vp = XFS_ITOV(ip);
VOP_RELEASE(vp, error);
VN_RELE(vp);
spin_lock(&xfs_refcache_lock);
}
}
xfs_refcache_busy--;
ASSERT(xfs_refcache_busy >= 0);
spin_unlock(&xfs_refcache_lock);
}
/*
* If the given inode is in the reference cache, purge its entry and
* release the reference on the vnode.
*/
void
xfs_refcache_purge_ip(
xfs_inode_t *ip)
{
vnode_t *vp;
int error;
/*
* If we're not pointing to our entry in the cache, then
* we must not be in the cache.
*/
if (ip->i_refcache == NULL) {
return;
}
spin_lock(&xfs_refcache_lock);
if (ip->i_refcache == NULL) {
spin_unlock(&xfs_refcache_lock);
return;
}
/*
* Clear both our pointer to the cache entry and its pointer
* back to us.
*/
ASSERT(*(ip->i_refcache) == ip);
*(ip->i_refcache) = NULL;
ip->i_refcache = NULL;
xfs_refcache_count--;
ASSERT(xfs_refcache_count >= 0);
spin_unlock(&xfs_refcache_lock);
vp = XFS_ITOV(ip);
/* ASSERT(vp->v_count > 1); */
VOP_RELEASE(vp, error);
VN_RELE(vp);
}
