+#ifdef XFS_ILOCK_TRACE
+ktrace_t *xfs_ilock_trace_buf;
+
+void
+xfs_ilock_trace(xfs_inode_t *ip, int lock, unsigned int lockflags, inst_t *ra)
+{
+ ktrace_enter(ip->i_lock_trace,
+ (void *)ip,
+ (void *)(unsigned long)lock, /* 1 = LOCK, 3=UNLOCK, etc */
+ (void *)(unsigned long)lockflags, /* XFS_ILOCK_EXCL etc */
+ (void *)ra, /* caller of ilock */
+ (void *)(unsigned long)current_cpu(),
+ (void *)(unsigned long)current_pid(),
+ NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL);
+}
+#endif
+
+/*
+ * Return a pointer to the extent record at file index idx.
+ */
+xfs_bmbt_rec_t *
+xfs_iext_get_ext(
+ xfs_ifork_t *ifp, /* inode fork pointer */
+ xfs_extnum_t idx) /* index of target extent */
+{
+ ASSERT(idx >= 0);
+ if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
+ return ifp->if_u1.if_ext_irec->er_extbuf;
+ } else if (ifp->if_flags & XFS_IFEXTIREC) {
+ xfs_ext_irec_t *erp; /* irec pointer */
+ int erp_idx = 0; /* irec index */
+ xfs_extnum_t page_idx = idx; /* ext index in target list */
+
+ erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
+ return &erp->er_extbuf[page_idx];
+ } else if (ifp->if_bytes) {
+ return &ifp->if_u1.if_extents[idx];
+ } else {
+ return NULL;
+ }
+}
+
+/*
+ * Insert new item(s) into the extent records for incore inode
+ * fork 'ifp'. 'count' new items are inserted at index 'idx'.
+ */
+void
+xfs_iext_insert(
+ xfs_ifork_t *ifp, /* inode fork pointer */
+ xfs_extnum_t idx, /* starting index of new items */
+ xfs_extnum_t count, /* number of inserted items */
+ xfs_bmbt_irec_t *new) /* items to insert */
+{
+ xfs_bmbt_rec_t *ep; /* extent record pointer */
+ xfs_extnum_t i; /* extent record index */
+
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ xfs_iext_add(ifp, idx, count);
+ for (i = idx; i < idx + count; i++, new++) {
+ ep = xfs_iext_get_ext(ifp, i);
+ xfs_bmbt_set_all(ep, new);
+ }
+}
+
+/*
+ * This is called when the amount of space required for incore file
+ * extents needs to be increased. The ext_diff parameter stores the
+ * number of new extents being added and the idx parameter contains
+ * the extent index where the new extents will be added. If the new
+ * extents are being appended, then we just need to (re)allocate and
+ * initialize the space. Otherwise, if the new extents are being
+ * inserted into the middle of the existing entries, a bit more work
+ * is required to make room for the new extents to be inserted. The
+ * caller is responsible for filling in the new extent entries upon
+ * return.
+ */
+void
+xfs_iext_add(
+ xfs_ifork_t *ifp, /* inode fork pointer */
+ xfs_extnum_t idx, /* index to begin adding exts */
+ int ext_diff) /* number of extents to add */
+{
+ int byte_diff; /* new bytes being added */
+ int new_size; /* size of extents after adding */
+ xfs_extnum_t nextents; /* number of extents in file */
+
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ ASSERT((idx >= 0) && (idx <= nextents));
+ byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t);
+ new_size = ifp->if_bytes + byte_diff;
+ /*
+ * If the new number of extents (nextents + ext_diff)
+ * fits inside the inode, then continue to use the inline
+ * extent buffer.
+ */
+ if (nextents + ext_diff <= XFS_INLINE_EXTS) {
+ if (idx < nextents) {
+ memmove(&ifp->if_u2.if_inline_ext[idx + ext_diff],
+ &ifp->if_u2.if_inline_ext[idx],
+ (nextents - idx) * sizeof(xfs_bmbt_rec_t));
+ memset(&ifp->if_u2.if_inline_ext[idx], 0, byte_diff);
+ }
+ ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
+ ifp->if_real_bytes = 0;
+ ifp->if_lastex = nextents + ext_diff;
+ }
+ /*
+ * Otherwise use a linear (direct) extent list.
+ * If the extents are currently inside the inode,
+ * xfs_iext_realloc_direct will switch us from
+ * inline to direct extent allocation mode.
+ */
+ else if (nextents + ext_diff <= XFS_LINEAR_EXTS) {
+ xfs_iext_realloc_direct(ifp, new_size);
+ if (idx < nextents) {
+ memmove(&ifp->if_u1.if_extents[idx + ext_diff],
+ &ifp->if_u1.if_extents[idx],
+ (nextents - idx) * sizeof(xfs_bmbt_rec_t));
+ memset(&ifp->if_u1.if_extents[idx], 0, byte_diff);
+ }
+ }
+ /* Indirection array */
+ else {
+ xfs_ext_irec_t *erp;
+ int erp_idx = 0;
+ int page_idx = idx;
+
+ ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS);
+ if (ifp->if_flags & XFS_IFEXTIREC) {
+ erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1);
+ } else {
+ xfs_iext_irec_init(ifp);
+ ASSERT(ifp->if_flags & XFS_IFEXTIREC);
+ erp = ifp->if_u1.if_ext_irec;
+ }
+ /* Extents fit in target extent page */
+ if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) {
+ if (page_idx < erp->er_extcount) {
+ memmove(&erp->er_extbuf[page_idx + ext_diff],
+ &erp->er_extbuf[page_idx],
+ (erp->er_extcount - page_idx) *
+ sizeof(xfs_bmbt_rec_t));
+ memset(&erp->er_extbuf[page_idx], 0, byte_diff);
+ }
+ erp->er_extcount += ext_diff;
+ xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
+ }
+ /* Insert a new extent page */
+ else if (erp) {
+ xfs_iext_add_indirect_multi(ifp,
+ erp_idx, page_idx, ext_diff);
+ }
+ /*
+ * If extent(s) are being appended to the last page in
+ * the indirection array and the new extent(s) don't fit
+ * in the page, then erp is NULL and erp_idx is set to
+ * the next index needed in the indirection array.
+ */
+ else {
+ int count = ext_diff;
+
+ while (count) {
+ erp = xfs_iext_irec_new(ifp, erp_idx);
+ erp->er_extcount = count;
+ count -= MIN(count, (int)XFS_LINEAR_EXTS);
+ if (count) {
+ erp_idx++;
+ }
+ }
+ }
+ }
+ ifp->if_bytes = new_size;
+}
+