-/*
- * Initialize the inode hash table for the newly mounted file system.
- * Choose an initial table size based on user specified value, else
- * use a simple algorithm using the maximum number of inodes as an
- * indicator for table size, and clamp it between one and some large
- * number of pages.
- */
-void
-xfs_ihash_init(xfs_mount_t *mp)
-{
- __uint64_t icount;
- uint i;
-
- if (!mp->m_ihsize) {
- icount = mp->m_maxicount ? mp->m_maxicount :
- (mp->m_sb.sb_dblocks << mp->m_sb.sb_inopblog);
- mp->m_ihsize = 1 << max_t(uint, 8,
- (xfs_highbit64(icount) + 1) / 2);
- mp->m_ihsize = min_t(uint, mp->m_ihsize,
- (64 * NBPP) / sizeof(xfs_ihash_t));
- }
-
- mp->m_ihash = kmem_zalloc_greedy(&mp->m_ihsize,
- NBPC * sizeof(xfs_ihash_t),
- mp->m_ihsize * sizeof(xfs_ihash_t),
- KM_SLEEP | KM_MAYFAIL | KM_LARGE);
- mp->m_ihsize /= sizeof(xfs_ihash_t);
- for (i = 0; i < mp->m_ihsize; i++)
- rwlock_init(&(mp->m_ihash[i].ih_lock));
-}
-
-/*
- * Free up structures allocated by xfs_ihash_init, at unmount time.
- */
-void
-xfs_ihash_free(xfs_mount_t *mp)
-{
- kmem_free(mp->m_ihash, mp->m_ihsize * sizeof(xfs_ihash_t));
- mp->m_ihash = NULL;
-}
-
-/*
- * Initialize the inode cluster hash table for the newly mounted file system.
- * Its size is derived from the ihash table size.
- */
-void
-xfs_chash_init(xfs_mount_t *mp)
-{
- uint i;
-
- mp->m_chsize = max_t(uint, 1, mp->m_ihsize /
- (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog));
- mp->m_chsize = min_t(uint, mp->m_chsize, mp->m_ihsize);
- mp->m_chash = (xfs_chash_t *)kmem_zalloc(mp->m_chsize
- * sizeof(xfs_chash_t),
- KM_SLEEP | KM_LARGE);
- for (i = 0; i < mp->m_chsize; i++) {
- spinlock_init(&mp->m_chash[i].ch_lock,"xfshash");
- }
-}
-
-/*
- * Free up structures allocated by xfs_chash_init, at unmount time.
- */
-void
-xfs_chash_free(xfs_mount_t *mp)
-{
- int i;
-
- for (i = 0; i < mp->m_chsize; i++) {
- spinlock_destroy(&mp->m_chash[i].ch_lock);
- }
-
- kmem_free(mp->m_chash, mp->m_chsize*sizeof(xfs_chash_t));
- mp->m_chash = NULL;
-}
-
-/*
- * Try to move an inode to the front of its hash list if possible
- * (and if its not there already). Called right after obtaining
- * the list version number and then dropping the read_lock on the
- * hash list in question (which is done right after looking up the
- * inode in question...).
- */
-STATIC void
-xfs_ihash_promote(
- xfs_ihash_t *ih,
- xfs_inode_t *ip,
- ulong version)
-{
- xfs_inode_t *iq;
-
- if ((ip->i_prevp != &ih->ih_next) && write_trylock(&ih->ih_lock)) {
- if (likely(version == ih->ih_version)) {
- /* remove from list */
- if ((iq = ip->i_next)) {
- iq->i_prevp = ip->i_prevp;
- }
- *ip->i_prevp = iq;
-
- /* insert at list head */
- iq = ih->ih_next;
- iq->i_prevp = &ip->i_next;
- ip->i_next = iq;
- ip->i_prevp = &ih->ih_next;
- ih->ih_next = ip;
- }
- write_unlock(&ih->ih_lock);
- }
-}
-