common/io/fssnap.c

165 static int snap_getchunk(struct snapshot_id *sidp, chunknumber_t chunk,
436 	struct snapshot_id *sidp, *sidnextp;
449 		for (sidp = snapshot; sidp != NULL; sidp = sidnextp) {
450 			ASSERT(SID_AVAILABLE(sidp) &&
451 			    !RW_LOCK_HELD(&sidp->sid_rwlock));
452 			sidnextp = sidp->sid_next;
453 			rw_destroy(&sidp->sid_rwlock);
454 			kmem_free(sidp, sizeof (struct snapshot_id));
484 	struct snapshot_id **sidpp, *sidp;
512 	sidp = *sidpp;
513 	rw_enter(&sidp->sid_rwlock, RW_WRITER);
515 	if ((flag & FEXCL) && SID_BUSY(sidp)) {
516 		rw_exit(&sidp->sid_rwlock);
520 	ASSERT(sidpp != NULL && sidp != NULL);
522 	if (SID_INACTIVE(sidp)) {
525 		rw_exit(&sidp->sid_rwlock);
531 		sidp->sid_flags |= SID_CHAR_BUSY;
534 		sidp->sid_flags |= SID_BLOCK_BUSY;
537 		rw_exit(&sidp->sid_rwlock);
541 	rw_exit(&sidp->sid_rwlock);
561 	struct snapshot_id	**sidpp, *sidp;
581 	sidp = *sidpp;
583 	rw_enter(&sidp->sid_rwlock, RW_WRITER);
588 		sidp->sid_flags &= ~(SID_CHAR_BUSY);
591 		sidp->sid_flags &= ~(SID_BLOCK_BUSY);
595 		rw_exit(&sidp->sid_rwlock);
599 	if (SID_AVAILABLE(sidp)) {
610 		    sidp->sid_snapnumber);
613 		    sidp->sid_snapnumber);
617 		ddi_soft_state_free(statep, sidp->sid_snapnumber);
622 	rw_exit(&sidp->sid_rwlock);
660 	struct snapshot_id **sidpp, *sidp;
688 	sidp = *sidpp;
689 	ASSERT(sidp);
690 	rw_enter(&sidp->sid_rwlock, RW_READER);
692 	if (SID_INACTIVE(sidp)) {
696 		rw_exit(&sidp->sid_rwlock);
707 	chunksz = sidp->sid_cowinfo->cow_map.cmap_chunksz;
715 		chunk = dbtocowchunk(&sidp->sid_cowinfo->cow_map, reqptr);
720 		if ((error = snap_getchunk(sidp, chunk, off, len, buf)) != 0) {
735 			rw_exit(&sidp->sid_rwlock);
746 	rw_exit(&sidp->sid_rwlock);
772 snap_getchunk(struct snapshot_id *sidp, chunknumber_t chunk, int offset,
775 	cow_map_t	*cmap = &sidp->sid_cowinfo->cow_map;
783 	ASSERT(RW_READ_HELD(&sidp->sid_rwlock));
833 		snapbuf->b_edev = sidp->sid_fvp->v_vfsp->vfs_dev;
904 		    (sidp->sid_cowinfo->cow_backfile_array)[bf_index],
1070 		snapshot_id_t		*sidp = NULL;
1101 		for (sidp = snapshot; sidp != NULL; sidp = sidnextp) {
1102 			rw_enter(&sidp->sid_rwlock, RW_READER);
1103 			sidnextp = sidp->sid_next;
1107 				if (sidp->sid_snapnumber == (uint_t)minor &&
1108 				    sidp->sid_fvp) {
1110 					vp = sidp->sid_fvp;
1112 					rw_exit(&sidp->sid_rwlock);
1117 				if (sidp->sid_fvp == vp) {
1118 					minor = sidp->sid_snapnumber;
1119 					rw_exit(&sidp->sid_rwlock);
1123 			rw_exit(&sidp->sid_rwlock);
1336 	struct snapshot_id *sidp;
1358 	sidp = *sidpp;
1364 	if (sidp == NULL) {
1373 	rw_enter(&sidp->sid_rwlock, RW_READER);
1380 	if (sidp->sid_flags & SID_DELETE) {
1381 		rw_exit(&sidp->sid_rwlock);
1394 	if (sidp != *sidpp || SID_INACTIVE(sidp)) {
1395 		rw_exit(&sidp->sid_rwlock);
1412 		if (sidp != *sidpp || SID_INACTIVE(sidp)) {
1413 			rw_exit(&sidp->sid_rwlock);
1420 	rw_exit(&sidp->sid_rwlock);
1444 	snapshot_id_t	*sidp = *sidpp;
1446 	struct cow_info	*cowp = sidp->sid_cowinfo;
1454 	ASSERT(RW_READ_HELD(&sidp->sid_rwlock));
1546 				rw_exit(&sidp->sid_rwlock);
1550 				rw_enter(&sidp->sid_rwlock, RW_READER);
1556 				if (sidp != *sidpp || SID_INACTIVE(sidp)) {
1600 			    "%lld, size %lu, error %d.", sidp->sid_snapnumber,
1622 		cmn->cmn_sid = sidp;
1659 	snapshot_id_t	*sidp = cmn->cmn_sid;
1660 	cow_info_t	*cowp = sidp->sid_cowinfo;
1674 	rw_enter(&sidp->sid_rwlock, RW_READER);
1675 	if (SID_INACTIVE(sidp)) {
1676 		rw_exit(&sidp->sid_rwlock);
1681 	rw_exit(&sidp->sid_rwlock);
1689 		    "bytes) and will be deleted.", sidp->sid_snapnumber,
1694 		atomic_or_uint(&sidp->sid_flags, SID_DELETE);
1707 		    "%s, offset %llu bytes, error %d.", sidp->sid_snapnumber,
1712 		atomic_or_uint(&sidp->sid_flags, SID_DELETE);
1755 	struct snapshot_id *sidp;
1776 	for (sidp = snapshot; sidp != NULL; sidp = sidp->sid_next) {
1777 		if (sidp->sid_snapnumber > lastsnap)
1778 			lastsnap = sidp->sid_snapnumber;
1785 		rw_enter(&sidp->sid_rwlock, RW_READER);
1793 		if (SID_AVAILABLE(sidp))
1795 		rw_exit(&sidp->sid_rwlock);
1803 	if (sidp) {
1804 		if (rw_tryupgrade(&sidp->sid_rwlock) == 0) {
1806 			rw_exit(&sidp->sid_rwlock);
1811 		sidp = kmem_alloc(sizeof (struct snapshot_id), KM_SLEEP);
1812 		rw_init(&sidp->sid_rwlock, NULL, RW_DEFAULT, NULL);
1813 		rw_enter(&sidp->sid_rwlock, RW_WRITER);
1814 		sidp->sid_snapnumber = (snapshot == NULL) ? 0 : lastsnap + 1;
1815 		sidp->sid_cowinfo = NULL;
1816 		sidp->sid_flags = 0;
1817 		sidp->sid_next = snapshot;
1818 		snapshot = sidp;
1821 	ASSERT(RW_WRITE_HELD(&sidp->sid_rwlock));
1822 	ASSERT(sidp->sid_cowinfo == NULL);
1823 	ASSERT(sidp->sid_snapnumber <= (lastsnap + 1));
1825 	sidp->sid_flags |= SID_CREATING;
1828 	sidp->sid_fvp = fsvp;
1845 	    sidp->sid_snapnumber);
1871 	sidp->sid_cowinfo = cowp;
1875 	fssnap_create_kstats(sidp, sidp->sid_snapnumber,
1885 	return (sidp);
1941 	struct snapshot_id	**sidpp, *sidp = snapshot_id;
1948 	ASSERT(sidp);
1949 	ASSERT(RW_WRITE_HELD(&sidp->sid_rwlock));
1950 	ASSERT(sidp->sid_cowinfo);
1952 	cowp = sidp->sid_cowinfo;
1957 	sidp->sid_flags &= ~(SID_CREATING | SID_DISABLED);
1958 	snapnumber = sidp->sid_snapnumber;
1970 	*sidpp = sidp;
1992 	rw_exit(&sidp->sid_rwlock);
2022 	struct snapshot_id	*sidp;
2031 	 * sidp is guaranteed to be valid if sidpp is valid because
2038 	sidp = *sidpp;
2039 	rw_enter(&sidp->sid_rwlock, RW_WRITER);
2041 	ASSERT(RW_WRITE_HELD(&sidp->sid_rwlock));
2047 		rw_exit(&sidp->sid_rwlock);
2058 	sidp->sid_flags |= SID_DISABLING;
2059 	if (sidp->sid_flags & SID_DELETE) {
2061 		    sidp->sid_snapnumber);
2062 		sidp->sid_flags &= ~(SID_DELETE);
2075 	cowp = sidp->sid_cowinfo;
2077 		rw_exit(&sidp->sid_rwlock);
2080 	rw_exit(&sidp->sid_rwlock);
2096 	sidp->sid_cowinfo = NULL;
2124 	statesidpp = ddi_get_soft_state(statep, sidp->sid_snapnumber);
2128 		    sidp->sid_snapnumber);
2130 	ASSERT(*statesidpp == sidp);
2138 	rw_enter(&sidp->sid_rwlock, RW_WRITER);
2139 	sidp->sid_flags &= ~(SID_DISABLING);
2140 	sidp->sid_flags |= SID_DISABLED;
2141 	VN_RELE(sidp->sid_fvp);
2142 	sidp->sid_fvp = NULL;
2143 	snapnumber = sidp->sid_snapnumber;
2150 	if (SID_AVAILABLE(sidp)) {
2154 		    sidp->sid_snapnumber);
2157 		    sidp->sid_snapnumber);
2161 		ddi_soft_state_free(statep, sidp->sid_snapnumber);
2166 	rw_exit(&sidp->sid_rwlock);
2176 fssnap_create_kstats(snapshot_id_t *sidp, int snapnum,
2181 	struct cow_info *cowp = sidp->sid_cowinfo;
2254 	num->ks_private = sidp;
2282 	snapshot_id_t *sidp = (snapshot_id_t *)ksp->ks_private;
2283 	struct cow_info *cowp = sidp->sid_cowinfo;
2290 	if (sidp->sid_flags & SID_CREATING)
2292 	else if (SID_INACTIVE(sidp))
2294 	else if (SID_BUSY(sidp))