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-rw-r--r--uts/common/fs/zfs/sa.c1970
1 files changed, 1970 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/sa.c b/uts/common/fs/zfs/sa.c
new file mode 100644
index 000000000000..4cb4546b2511
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+++ b/uts/common/fs/zfs/sa.c
@@ -0,0 +1,1970 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/zfs_context.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysmacros.h>
+#include <sys/dmu.h>
+#include <sys/dmu_impl.h>
+#include <sys/dmu_objset.h>
+#include <sys/dbuf.h>
+#include <sys/dnode.h>
+#include <sys/zap.h>
+#include <sys/sa.h>
+#include <sys/sunddi.h>
+#include <sys/sa_impl.h>
+#include <sys/dnode.h>
+#include <sys/errno.h>
+#include <sys/zfs_context.h>
+
+/*
+ * ZFS System attributes:
+ *
+ * A generic mechanism to allow for arbitrary attributes
+ * to be stored in a dnode. The data will be stored in the bonus buffer of
+ * the dnode and if necessary a special "spill" block will be used to handle
+ * overflow situations. The spill block will be sized to fit the data
+ * from 512 - 128K. When a spill block is used the BP (blkptr_t) for the
+ * spill block is stored at the end of the current bonus buffer. Any
+ * attributes that would be in the way of the blkptr_t will be relocated
+ * into the spill block.
+ *
+ * Attribute registration:
+ *
+ * Stored persistently on a per dataset basis
+ * a mapping between attribute "string" names and their actual attribute
+ * numeric values, length, and byteswap function. The names are only used
+ * during registration. All attributes are known by their unique attribute
+ * id value. If an attribute can have a variable size then the value
+ * 0 will be used to indicate this.
+ *
+ * Attribute Layout:
+ *
+ * Attribute layouts are a way to compactly store multiple attributes, but
+ * without taking the overhead associated with managing each attribute
+ * individually. Since you will typically have the same set of attributes
+ * stored in the same order a single table will be used to represent that
+ * layout. The ZPL for example will usually have only about 10 different
+ * layouts (regular files, device files, symlinks,
+ * regular files + scanstamp, files/dir with extended attributes, and then
+ * you have the possibility of all of those minus ACL, because it would
+ * be kicked out into the spill block)
+ *
+ * Layouts are simply an array of the attributes and their
+ * ordering i.e. [0, 1, 4, 5, 2]
+ *
+ * Each distinct layout is given a unique layout number and that is whats
+ * stored in the header at the beginning of the SA data buffer.
+ *
+ * A layout only covers a single dbuf (bonus or spill). If a set of
+ * attributes is split up between the bonus buffer and a spill buffer then
+ * two different layouts will be used. This allows us to byteswap the
+ * spill without looking at the bonus buffer and keeps the on disk format of
+ * the bonus and spill buffer the same.
+ *
+ * Adding a single attribute will cause the entire set of attributes to
+ * be rewritten and could result in a new layout number being constructed
+ * as part of the rewrite if no such layout exists for the new set of
+ * attribues. The new attribute will be appended to the end of the already
+ * existing attributes.
+ *
+ * Both the attribute registration and attribute layout information are
+ * stored in normal ZAP attributes. Their should be a small number of
+ * known layouts and the set of attributes is assumed to typically be quite
+ * small.
+ *
+ * The registered attributes and layout "table" information is maintained
+ * in core and a special "sa_os_t" is attached to the objset_t.
+ *
+ * A special interface is provided to allow for quickly applying
+ * a large set of attributes at once. sa_replace_all_by_template() is
+ * used to set an array of attributes. This is used by the ZPL when
+ * creating a brand new file. The template that is passed into the function
+ * specifies the attribute, size for variable length attributes, location of
+ * data and special "data locator" function if the data isn't in a contiguous
+ * location.
+ *
+ * Byteswap implications:
+ * Since the SA attributes are not entirely self describing we can't do
+ * the normal byteswap processing. The special ZAP layout attribute and
+ * attribute registration attributes define the byteswap function and the
+ * size of the attributes, unless it is variable sized.
+ * The normal ZFS byteswapping infrastructure assumes you don't need
+ * to read any objects in order to do the necessary byteswapping. Whereas
+ * SA attributes can only be properly byteswapped if the dataset is opened
+ * and the layout/attribute ZAP attributes are available. Because of this
+ * the SA attributes will be byteswapped when they are first accessed by
+ * the SA code that will read the SA data.
+ */
+
+typedef void (sa_iterfunc_t)(void *hdr, void *addr, sa_attr_type_t,
+ uint16_t length, int length_idx, boolean_t, void *userp);
+
+static int sa_build_index(sa_handle_t *hdl, sa_buf_type_t buftype);
+static void sa_idx_tab_hold(objset_t *os, sa_idx_tab_t *idx_tab);
+static void *sa_find_idx_tab(objset_t *os, dmu_object_type_t bonustype,
+ void *data);
+static void sa_idx_tab_rele(objset_t *os, void *arg);
+static void sa_copy_data(sa_data_locator_t *func, void *start, void *target,
+ int buflen);
+static int sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
+ sa_data_op_t action, sa_data_locator_t *locator, void *datastart,
+ uint16_t buflen, dmu_tx_t *tx);
+
+arc_byteswap_func_t *sa_bswap_table[] = {
+ byteswap_uint64_array,
+ byteswap_uint32_array,
+ byteswap_uint16_array,
+ byteswap_uint8_array,
+ zfs_acl_byteswap,
+};
+
+#define SA_COPY_DATA(f, s, t, l) \
+ { \
+ if (f == NULL) { \
+ if (l == 8) { \
+ *(uint64_t *)t = *(uint64_t *)s; \
+ } else if (l == 16) { \
+ *(uint64_t *)t = *(uint64_t *)s; \
+ *(uint64_t *)((uintptr_t)t + 8) = \
+ *(uint64_t *)((uintptr_t)s + 8); \
+ } else { \
+ bcopy(s, t, l); \
+ } \
+ } else \
+ sa_copy_data(f, s, t, l); \
+ }
+
+/*
+ * This table is fixed and cannot be changed. Its purpose is to
+ * allow the SA code to work with both old/new ZPL file systems.
+ * It contains the list of legacy attributes. These attributes aren't
+ * stored in the "attribute" registry zap objects, since older ZPL file systems
+ * won't have the registry. Only objsets of type ZFS_TYPE_FILESYSTEM will
+ * use this static table.
+ */
+sa_attr_reg_t sa_legacy_attrs[] = {
+ {"ZPL_ATIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 0},
+ {"ZPL_MTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 1},
+ {"ZPL_CTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 2},
+ {"ZPL_CRTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 3},
+ {"ZPL_GEN", sizeof (uint64_t), SA_UINT64_ARRAY, 4},
+ {"ZPL_MODE", sizeof (uint64_t), SA_UINT64_ARRAY, 5},
+ {"ZPL_SIZE", sizeof (uint64_t), SA_UINT64_ARRAY, 6},
+ {"ZPL_PARENT", sizeof (uint64_t), SA_UINT64_ARRAY, 7},
+ {"ZPL_LINKS", sizeof (uint64_t), SA_UINT64_ARRAY, 8},
+ {"ZPL_XATTR", sizeof (uint64_t), SA_UINT64_ARRAY, 9},
+ {"ZPL_RDEV", sizeof (uint64_t), SA_UINT64_ARRAY, 10},
+ {"ZPL_FLAGS", sizeof (uint64_t), SA_UINT64_ARRAY, 11},
+ {"ZPL_UID", sizeof (uint64_t), SA_UINT64_ARRAY, 12},
+ {"ZPL_GID", sizeof (uint64_t), SA_UINT64_ARRAY, 13},
+ {"ZPL_PAD", sizeof (uint64_t) * 4, SA_UINT64_ARRAY, 14},
+ {"ZPL_ZNODE_ACL", 88, SA_UINT8_ARRAY, 15},
+};
+
+/*
+ * ZPL legacy layout
+ * This is only used for objects of type DMU_OT_ZNODE
+ */
+sa_attr_type_t sa_legacy_zpl_layout[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
+};
+
+/*
+ * Special dummy layout used for buffers with no attributes.
+ */
+
+sa_attr_type_t sa_dummy_zpl_layout[] = { 0 };
+
+static int sa_legacy_attr_count = 16;
+static kmem_cache_t *sa_cache = NULL;
+
+/*ARGSUSED*/
+static int
+sa_cache_constructor(void *buf, void *unused, int kmflag)
+{
+ sa_handle_t *hdl = buf;
+
+ hdl->sa_bonus_tab = NULL;
+ hdl->sa_spill_tab = NULL;
+ hdl->sa_os = NULL;
+ hdl->sa_userp = NULL;
+ hdl->sa_bonus = NULL;
+ hdl->sa_spill = NULL;
+ mutex_init(&hdl->sa_lock, NULL, MUTEX_DEFAULT, NULL);
+ return (0);
+}
+
+/*ARGSUSED*/
+static void
+sa_cache_destructor(void *buf, void *unused)
+{
+ sa_handle_t *hdl = buf;
+ mutex_destroy(&hdl->sa_lock);
+}
+
+void
+sa_cache_init(void)
+{
+ sa_cache = kmem_cache_create("sa_cache",
+ sizeof (sa_handle_t), 0, sa_cache_constructor,
+ sa_cache_destructor, NULL, NULL, NULL, 0);
+}
+
+void
+sa_cache_fini(void)
+{
+ if (sa_cache)
+ kmem_cache_destroy(sa_cache);
+}
+
+static int
+layout_num_compare(const void *arg1, const void *arg2)
+{
+ const sa_lot_t *node1 = arg1;
+ const sa_lot_t *node2 = arg2;
+
+ if (node1->lot_num > node2->lot_num)
+ return (1);
+ else if (node1->lot_num < node2->lot_num)
+ return (-1);
+ return (0);
+}
+
+static int
+layout_hash_compare(const void *arg1, const void *arg2)
+{
+ const sa_lot_t *node1 = arg1;
+ const sa_lot_t *node2 = arg2;
+
+ if (node1->lot_hash > node2->lot_hash)
+ return (1);
+ if (node1->lot_hash < node2->lot_hash)
+ return (-1);
+ if (node1->lot_instance > node2->lot_instance)
+ return (1);
+ if (node1->lot_instance < node2->lot_instance)
+ return (-1);
+ return (0);
+}
+
+boolean_t
+sa_layout_equal(sa_lot_t *tbf, sa_attr_type_t *attrs, int count)
+{
+ int i;
+
+ if (count != tbf->lot_attr_count)
+ return (1);
+
+ for (i = 0; i != count; i++) {
+ if (attrs[i] != tbf->lot_attrs[i])
+ return (1);
+ }
+ return (0);
+}
+
+#define SA_ATTR_HASH(attr) (zfs_crc64_table[(-1ULL ^ attr) & 0xFF])
+
+static uint64_t
+sa_layout_info_hash(sa_attr_type_t *attrs, int attr_count)
+{
+ int i;
+ uint64_t crc = -1ULL;
+
+ for (i = 0; i != attr_count; i++)
+ crc ^= SA_ATTR_HASH(attrs[i]);
+
+ return (crc);
+}
+
+static int
+sa_get_spill(sa_handle_t *hdl)
+{
+ int rc;
+ if (hdl->sa_spill == NULL) {
+ if ((rc = dmu_spill_hold_existing(hdl->sa_bonus, NULL,
+ &hdl->sa_spill)) == 0)
+ VERIFY(0 == sa_build_index(hdl, SA_SPILL));
+ } else {
+ rc = 0;
+ }
+
+ return (rc);
+}
+
+/*
+ * Main attribute lookup/update function
+ * returns 0 for success or non zero for failures
+ *
+ * Operates on bulk array, first failure will abort further processing
+ */
+int
+sa_attr_op(sa_handle_t *hdl, sa_bulk_attr_t *bulk, int count,
+ sa_data_op_t data_op, dmu_tx_t *tx)
+{
+ sa_os_t *sa = hdl->sa_os->os_sa;
+ int i;
+ int error = 0;
+ sa_buf_type_t buftypes;
+
+ buftypes = 0;
+
+ ASSERT(count > 0);
+ for (i = 0; i != count; i++) {
+ ASSERT(bulk[i].sa_attr <= hdl->sa_os->os_sa->sa_num_attrs);
+
+ bulk[i].sa_addr = NULL;
+ /* First check the bonus buffer */
+
+ if (hdl->sa_bonus_tab && TOC_ATTR_PRESENT(
+ hdl->sa_bonus_tab->sa_idx_tab[bulk[i].sa_attr])) {
+ SA_ATTR_INFO(sa, hdl->sa_bonus_tab,
+ SA_GET_HDR(hdl, SA_BONUS),
+ bulk[i].sa_attr, bulk[i], SA_BONUS, hdl);
+ if (tx && !(buftypes & SA_BONUS)) {
+ dmu_buf_will_dirty(hdl->sa_bonus, tx);
+ buftypes |= SA_BONUS;
+ }
+ }
+ if (bulk[i].sa_addr == NULL &&
+ ((error = sa_get_spill(hdl)) == 0)) {
+ if (TOC_ATTR_PRESENT(
+ hdl->sa_spill_tab->sa_idx_tab[bulk[i].sa_attr])) {
+ SA_ATTR_INFO(sa, hdl->sa_spill_tab,
+ SA_GET_HDR(hdl, SA_SPILL),
+ bulk[i].sa_attr, bulk[i], SA_SPILL, hdl);
+ if (tx && !(buftypes & SA_SPILL) &&
+ bulk[i].sa_size == bulk[i].sa_length) {
+ dmu_buf_will_dirty(hdl->sa_spill, tx);
+ buftypes |= SA_SPILL;
+ }
+ }
+ }
+ if (error && error != ENOENT) {
+ return ((error == ECKSUM) ? EIO : error);
+ }
+
+ switch (data_op) {
+ case SA_LOOKUP:
+ if (bulk[i].sa_addr == NULL)
+ return (ENOENT);
+ if (bulk[i].sa_data) {
+ SA_COPY_DATA(bulk[i].sa_data_func,
+ bulk[i].sa_addr, bulk[i].sa_data,
+ bulk[i].sa_size);
+ }
+ continue;
+
+ case SA_UPDATE:
+ /* existing rewrite of attr */
+ if (bulk[i].sa_addr &&
+ bulk[i].sa_size == bulk[i].sa_length) {
+ SA_COPY_DATA(bulk[i].sa_data_func,
+ bulk[i].sa_data, bulk[i].sa_addr,
+ bulk[i].sa_length);
+ continue;
+ } else if (bulk[i].sa_addr) { /* attr size change */
+ error = sa_modify_attrs(hdl, bulk[i].sa_attr,
+ SA_REPLACE, bulk[i].sa_data_func,
+ bulk[i].sa_data, bulk[i].sa_length, tx);
+ } else { /* adding new attribute */
+ error = sa_modify_attrs(hdl, bulk[i].sa_attr,
+ SA_ADD, bulk[i].sa_data_func,
+ bulk[i].sa_data, bulk[i].sa_length, tx);
+ }
+ if (error)
+ return (error);
+ break;
+ }
+ }
+ return (error);
+}
+
+static sa_lot_t *
+sa_add_layout_entry(objset_t *os, sa_attr_type_t *attrs, int attr_count,
+ uint64_t lot_num, uint64_t hash, boolean_t zapadd, dmu_tx_t *tx)
+{
+ sa_os_t *sa = os->os_sa;
+ sa_lot_t *tb, *findtb;
+ int i;
+ avl_index_t loc;
+
+ ASSERT(MUTEX_HELD(&sa->sa_lock));
+ tb = kmem_zalloc(sizeof (sa_lot_t), KM_SLEEP);
+ tb->lot_attr_count = attr_count;
+ tb->lot_attrs = kmem_alloc(sizeof (sa_attr_type_t) * attr_count,
+ KM_SLEEP);
+ bcopy(attrs, tb->lot_attrs, sizeof (sa_attr_type_t) * attr_count);
+ tb->lot_num = lot_num;
+ tb->lot_hash = hash;
+ tb->lot_instance = 0;
+
+ if (zapadd) {
+ char attr_name[8];
+
+ if (sa->sa_layout_attr_obj == 0) {
+ sa->sa_layout_attr_obj = zap_create(os,
+ DMU_OT_SA_ATTR_LAYOUTS, DMU_OT_NONE, 0, tx);
+ VERIFY(zap_add(os, sa->sa_master_obj, SA_LAYOUTS, 8, 1,
+ &sa->sa_layout_attr_obj, tx) == 0);
+ }
+
+ (void) snprintf(attr_name, sizeof (attr_name),
+ "%d", (int)lot_num);
+ VERIFY(0 == zap_update(os, os->os_sa->sa_layout_attr_obj,
+ attr_name, 2, attr_count, attrs, tx));
+ }
+
+ list_create(&tb->lot_idx_tab, sizeof (sa_idx_tab_t),
+ offsetof(sa_idx_tab_t, sa_next));
+
+ for (i = 0; i != attr_count; i++) {
+ if (sa->sa_attr_table[tb->lot_attrs[i]].sa_length == 0)
+ tb->lot_var_sizes++;
+ }
+
+ avl_add(&sa->sa_layout_num_tree, tb);
+
+ /* verify we don't have a hash collision */
+ if ((findtb = avl_find(&sa->sa_layout_hash_tree, tb, &loc)) != NULL) {
+ for (; findtb && findtb->lot_hash == hash;
+ findtb = AVL_NEXT(&sa->sa_layout_hash_tree, findtb)) {
+ if (findtb->lot_instance != tb->lot_instance)
+ break;
+ tb->lot_instance++;
+ }
+ }
+ avl_add(&sa->sa_layout_hash_tree, tb);
+ return (tb);
+}
+
+static void
+sa_find_layout(objset_t *os, uint64_t hash, sa_attr_type_t *attrs,
+ int count, dmu_tx_t *tx, sa_lot_t **lot)
+{
+ sa_lot_t *tb, tbsearch;
+ avl_index_t loc;
+ sa_os_t *sa = os->os_sa;
+ boolean_t found = B_FALSE;
+
+ mutex_enter(&sa->sa_lock);
+ tbsearch.lot_hash = hash;
+ tbsearch.lot_instance = 0;
+ tb = avl_find(&sa->sa_layout_hash_tree, &tbsearch, &loc);
+ if (tb) {
+ for (; tb && tb->lot_hash == hash;
+ tb = AVL_NEXT(&sa->sa_layout_hash_tree, tb)) {
+ if (sa_layout_equal(tb, attrs, count) == 0) {
+ found = B_TRUE;
+ break;
+ }
+ }
+ }
+ if (!found) {
+ tb = sa_add_layout_entry(os, attrs, count,
+ avl_numnodes(&sa->sa_layout_num_tree), hash, B_TRUE, tx);
+ }
+ mutex_exit(&sa->sa_lock);
+ *lot = tb;
+}
+
+static int
+sa_resize_spill(sa_handle_t *hdl, uint32_t size, dmu_tx_t *tx)
+{
+ int error;
+ uint32_t blocksize;
+
+ if (size == 0) {
+ blocksize = SPA_MINBLOCKSIZE;
+ } else if (size > SPA_MAXBLOCKSIZE) {
+ ASSERT(0);
+ return (EFBIG);
+ } else {
+ blocksize = P2ROUNDUP_TYPED(size, SPA_MINBLOCKSIZE, uint32_t);
+ }
+
+ error = dbuf_spill_set_blksz(hdl->sa_spill, blocksize, tx);
+ ASSERT(error == 0);
+ return (error);
+}
+
+static void
+sa_copy_data(sa_data_locator_t *func, void *datastart, void *target, int buflen)
+{
+ if (func == NULL) {
+ bcopy(datastart, target, buflen);
+ } else {
+ boolean_t start;
+ int bytes;
+ void *dataptr;
+ void *saptr = target;
+ uint32_t length;
+
+ start = B_TRUE;
+ bytes = 0;
+ while (bytes < buflen) {
+ func(&dataptr, &length, buflen, start, datastart);
+ bcopy(dataptr, saptr, length);
+ saptr = (void *)((caddr_t)saptr + length);
+ bytes += length;
+ start = B_FALSE;
+ }
+ }
+}
+
+/*
+ * Determine several different sizes
+ * first the sa header size
+ * the number of bytes to be stored
+ * if spill would occur the index in the attribute array is returned
+ *
+ * the boolean will_spill will be set when spilling is necessary. It
+ * is only set when the buftype is SA_BONUS
+ */
+static int
+sa_find_sizes(sa_os_t *sa, sa_bulk_attr_t *attr_desc, int attr_count,
+ dmu_buf_t *db, sa_buf_type_t buftype, int *index, int *total,
+ boolean_t *will_spill)
+{
+ int var_size = 0;
+ int i;
+ int full_space;
+ int hdrsize;
+ boolean_t done = B_FALSE;
+
+ if (buftype == SA_BONUS && sa->sa_force_spill) {
+ *total = 0;
+ *index = 0;
+ *will_spill = B_TRUE;
+ return (0);
+ }
+
+ *index = -1;
+ *total = 0;
+
+ if (buftype == SA_BONUS)
+ *will_spill = B_FALSE;
+
+ hdrsize = (SA_BONUSTYPE_FROM_DB(db) == DMU_OT_ZNODE) ? 0 :
+ sizeof (sa_hdr_phys_t);
+
+ full_space = (buftype == SA_BONUS) ? DN_MAX_BONUSLEN : db->db_size;
+
+ for (i = 0; i != attr_count; i++) {
+ boolean_t is_var_sz;
+
+ *total += attr_desc[i].sa_length;
+ if (done)
+ goto next;
+
+ is_var_sz = (SA_REGISTERED_LEN(sa, attr_desc[i].sa_attr) == 0);
+ if (is_var_sz) {
+ var_size++;
+ }
+
+ if (is_var_sz && var_size > 1) {
+ if (P2ROUNDUP(hdrsize + sizeof (uint16_t), 8) +
+ *total < full_space) {
+ hdrsize += sizeof (uint16_t);
+ } else {
+ done = B_TRUE;
+ *index = i;
+ if (buftype == SA_BONUS)
+ *will_spill = B_TRUE;
+ continue;
+ }
+ }
+
+ /*
+ * find index of where spill *could* occur.
+ * Then continue to count of remainder attribute
+ * space. The sum is used later for sizing bonus
+ * and spill buffer.
+ */
+ if (buftype == SA_BONUS && *index == -1 &&
+ P2ROUNDUP(*total + hdrsize, 8) >
+ (full_space - sizeof (blkptr_t))) {
+ *index = i;
+ done = B_TRUE;
+ }
+
+next:
+ if (P2ROUNDUP(*total + hdrsize, 8) > full_space &&
+ buftype == SA_BONUS)
+ *will_spill = B_TRUE;
+ }
+
+ hdrsize = P2ROUNDUP(hdrsize, 8);
+ return (hdrsize);
+}
+
+#define BUF_SPACE_NEEDED(total, header) (total + header)
+
+/*
+ * Find layout that corresponds to ordering of attributes
+ * If not found a new layout number is created and added to
+ * persistent layout tables.
+ */
+static int
+sa_build_layouts(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc, int attr_count,
+ dmu_tx_t *tx)
+{
+ sa_os_t *sa = hdl->sa_os->os_sa;
+ uint64_t hash;
+ sa_buf_type_t buftype;
+ sa_hdr_phys_t *sahdr;
+ void *data_start;
+ int buf_space;
+ sa_attr_type_t *attrs, *attrs_start;
+ int i, lot_count;
+ int hdrsize, spillhdrsize;
+ int used;
+ dmu_object_type_t bonustype;
+ sa_lot_t *lot;
+ int len_idx;
+ int spill_used;
+ boolean_t spilling;
+
+ dmu_buf_will_dirty(hdl->sa_bonus, tx);
+ bonustype = SA_BONUSTYPE_FROM_DB(hdl->sa_bonus);
+
+ /* first determine bonus header size and sum of all attributes */
+ hdrsize = sa_find_sizes(sa, attr_desc, attr_count, hdl->sa_bonus,
+ SA_BONUS, &i, &used, &spilling);
+
+ if (used > SPA_MAXBLOCKSIZE)
+ return (EFBIG);
+
+ VERIFY(0 == dmu_set_bonus(hdl->sa_bonus, spilling ?
+ MIN(DN_MAX_BONUSLEN - sizeof (blkptr_t), used + hdrsize) :
+ used + hdrsize, tx));
+
+ ASSERT((bonustype == DMU_OT_ZNODE && spilling == 0) ||
+ bonustype == DMU_OT_SA);
+
+ /* setup and size spill buffer when needed */
+ if (spilling) {
+ boolean_t dummy;
+
+ if (hdl->sa_spill == NULL) {
+ VERIFY(dmu_spill_hold_by_bonus(hdl->sa_bonus, NULL,
+ &hdl->sa_spill) == 0);
+ }
+ dmu_buf_will_dirty(hdl->sa_spill, tx);
+
+ spillhdrsize = sa_find_sizes(sa, &attr_desc[i],
+ attr_count - i, hdl->sa_spill, SA_SPILL, &i,
+ &spill_used, &dummy);
+
+ if (spill_used > SPA_MAXBLOCKSIZE)
+ return (EFBIG);
+
+ buf_space = hdl->sa_spill->db_size - spillhdrsize;
+ if (BUF_SPACE_NEEDED(spill_used, spillhdrsize) >
+ hdl->sa_spill->db_size)
+ VERIFY(0 == sa_resize_spill(hdl,
+ BUF_SPACE_NEEDED(spill_used, spillhdrsize), tx));
+ }
+
+ /* setup starting pointers to lay down data */
+ data_start = (void *)((uintptr_t)hdl->sa_bonus->db_data + hdrsize);
+ sahdr = (sa_hdr_phys_t *)hdl->sa_bonus->db_data;
+ buftype = SA_BONUS;
+
+ if (spilling)
+ buf_space = (sa->sa_force_spill) ?
+ 0 : SA_BLKPTR_SPACE - hdrsize;
+ else
+ buf_space = hdl->sa_bonus->db_size - hdrsize;
+
+ attrs_start = attrs = kmem_alloc(sizeof (sa_attr_type_t) * attr_count,
+ KM_SLEEP);
+ lot_count = 0;
+
+ for (i = 0, len_idx = 0, hash = -1ULL; i != attr_count; i++) {
+ uint16_t length;
+
+ attrs[i] = attr_desc[i].sa_attr;
+ length = SA_REGISTERED_LEN(sa, attrs[i]);
+ if (length == 0)
+ length = attr_desc[i].sa_length;
+
+ if (buf_space < length) { /* switch to spill buffer */
+ VERIFY(bonustype == DMU_OT_SA);
+ if (buftype == SA_BONUS && !sa->sa_force_spill) {
+ sa_find_layout(hdl->sa_os, hash, attrs_start,
+ lot_count, tx, &lot);
+ SA_SET_HDR(sahdr, lot->lot_num, hdrsize);
+ }
+
+ buftype = SA_SPILL;
+ hash = -1ULL;
+ len_idx = 0;
+
+ sahdr = (sa_hdr_phys_t *)hdl->sa_spill->db_data;
+ sahdr->sa_magic = SA_MAGIC;
+ data_start = (void *)((uintptr_t)sahdr +
+ spillhdrsize);
+ attrs_start = &attrs[i];
+ buf_space = hdl->sa_spill->db_size - spillhdrsize;
+ lot_count = 0;
+ }
+ hash ^= SA_ATTR_HASH(attrs[i]);
+ attr_desc[i].sa_addr = data_start;
+ attr_desc[i].sa_size = length;
+ SA_COPY_DATA(attr_desc[i].sa_data_func, attr_desc[i].sa_data,
+ data_start, length);
+ if (sa->sa_attr_table[attrs[i]].sa_length == 0) {
+ sahdr->sa_lengths[len_idx++] = length;
+ }
+ data_start = (void *)P2ROUNDUP(((uintptr_t)data_start +
+ length), 8);
+ buf_space -= P2ROUNDUP(length, 8);
+ lot_count++;
+ }
+
+ sa_find_layout(hdl->sa_os, hash, attrs_start, lot_count, tx, &lot);
+
+ /*
+ * Verify that old znodes always have layout number 0.
+ * Must be DMU_OT_SA for arbitrary layouts
+ */
+ VERIFY((bonustype == DMU_OT_ZNODE && lot->lot_num == 0) ||
+ (bonustype == DMU_OT_SA && lot->lot_num > 1));
+
+ if (bonustype == DMU_OT_SA) {
+ SA_SET_HDR(sahdr, lot->lot_num,
+ buftype == SA_BONUS ? hdrsize : spillhdrsize);
+ }
+
+ kmem_free(attrs, sizeof (sa_attr_type_t) * attr_count);
+ if (hdl->sa_bonus_tab) {
+ sa_idx_tab_rele(hdl->sa_os, hdl->sa_bonus_tab);
+ hdl->sa_bonus_tab = NULL;
+ }
+ if (!sa->sa_force_spill)
+ VERIFY(0 == sa_build_index(hdl, SA_BONUS));
+ if (hdl->sa_spill) {
+ sa_idx_tab_rele(hdl->sa_os, hdl->sa_spill_tab);
+ if (!spilling) {
+ /*
+ * remove spill block that is no longer needed.
+ */
+ dmu_buf_rele(hdl->sa_spill, NULL);
+ hdl->sa_spill = NULL;
+ hdl->sa_spill_tab = NULL;
+ VERIFY(0 == dmu_rm_spill(hdl->sa_os,
+ sa_handle_object(hdl), tx));
+ } else {
+ VERIFY(0 == sa_build_index(hdl, SA_SPILL));
+ }
+ }
+
+ return (0);
+}
+
+static void
+sa_free_attr_table(sa_os_t *sa)
+{
+ int i;
+
+ if (sa->sa_attr_table == NULL)
+ return;
+
+ for (i = 0; i != sa->sa_num_attrs; i++) {
+ if (sa->sa_attr_table[i].sa_name)
+ kmem_free(sa->sa_attr_table[i].sa_name,
+ strlen(sa->sa_attr_table[i].sa_name) + 1);
+ }
+
+ kmem_free(sa->sa_attr_table,
+ sizeof (sa_attr_table_t) * sa->sa_num_attrs);
+
+ sa->sa_attr_table = NULL;
+}
+
+static int
+sa_attr_table_setup(objset_t *os, sa_attr_reg_t *reg_attrs, int count)
+{
+ sa_os_t *sa = os->os_sa;
+ uint64_t sa_attr_count = 0;
+ uint64_t sa_reg_count;
+ int error = 0;
+ uint64_t attr_value;
+ sa_attr_table_t *tb;
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ int registered_count = 0;
+ int i;
+ dmu_objset_type_t ostype = dmu_objset_type(os);
+
+ sa->sa_user_table =
+ kmem_zalloc(count * sizeof (sa_attr_type_t), KM_SLEEP);
+ sa->sa_user_table_sz = count * sizeof (sa_attr_type_t);
+
+ if (sa->sa_reg_attr_obj != 0) {
+ error = zap_count(os, sa->sa_reg_attr_obj,
+ &sa_attr_count);
+
+ /*
+ * Make sure we retrieved a count and that it isn't zero
+ */
+ if (error || (error == 0 && sa_attr_count == 0)) {
+ if (error == 0)
+ error = EINVAL;
+ goto bail;
+ }
+ sa_reg_count = sa_attr_count;
+ }
+
+ if (ostype == DMU_OST_ZFS && sa_attr_count == 0)
+ sa_attr_count += sa_legacy_attr_count;
+
+ /* Allocate attribute numbers for attributes that aren't registered */
+ for (i = 0; i != count; i++) {
+ boolean_t found = B_FALSE;
+ int j;
+
+ if (ostype == DMU_OST_ZFS) {
+ for (j = 0; j != sa_legacy_attr_count; j++) {
+ if (strcmp(reg_attrs[i].sa_name,
+ sa_legacy_attrs[j].sa_name) == 0) {
+ sa->sa_user_table[i] =
+ sa_legacy_attrs[j].sa_attr;
+ found = B_TRUE;
+ }
+ }
+ }
+ if (found)
+ continue;
+
+ if (sa->sa_reg_attr_obj)
+ error = zap_lookup(os, sa->sa_reg_attr_obj,
+ reg_attrs[i].sa_name, 8, 1, &attr_value);
+ else
+ error = ENOENT;
+ switch (error) {
+ case ENOENT:
+ sa->sa_user_table[i] = (sa_attr_type_t)sa_attr_count;
+ sa_attr_count++;
+ break;
+ case 0:
+ sa->sa_user_table[i] = ATTR_NUM(attr_value);
+ break;
+ default:
+ goto bail;
+ }
+ }
+
+ sa->sa_num_attrs = sa_attr_count;
+ tb = sa->sa_attr_table =
+ kmem_zalloc(sizeof (sa_attr_table_t) * sa_attr_count, KM_SLEEP);
+
+ /*
+ * Attribute table is constructed from requested attribute list,
+ * previously foreign registered attributes, and also the legacy
+ * ZPL set of attributes.
+ */
+
+ if (sa->sa_reg_attr_obj) {
+ for (zap_cursor_init(&zc, os, sa->sa_reg_attr_obj);
+ (error = zap_cursor_retrieve(&zc, &za)) == 0;
+ zap_cursor_advance(&zc)) {
+ uint64_t value;
+ value = za.za_first_integer;
+
+ registered_count++;
+ tb[ATTR_NUM(value)].sa_attr = ATTR_NUM(value);
+ tb[ATTR_NUM(value)].sa_length = ATTR_LENGTH(value);
+ tb[ATTR_NUM(value)].sa_byteswap = ATTR_BSWAP(value);
+ tb[ATTR_NUM(value)].sa_registered = B_TRUE;
+
+ if (tb[ATTR_NUM(value)].sa_name) {
+ continue;
+ }
+ tb[ATTR_NUM(value)].sa_name =
+ kmem_zalloc(strlen(za.za_name) +1, KM_SLEEP);
+ (void) strlcpy(tb[ATTR_NUM(value)].sa_name, za.za_name,
+ strlen(za.za_name) +1);
+ }
+ zap_cursor_fini(&zc);
+ /*
+ * Make sure we processed the correct number of registered
+ * attributes
+ */
+ if (registered_count != sa_reg_count) {
+ ASSERT(error != 0);
+ goto bail;
+ }
+
+ }
+
+ if (ostype == DMU_OST_ZFS) {
+ for (i = 0; i != sa_legacy_attr_count; i++) {
+ if (tb[i].sa_name)
+ continue;
+ tb[i].sa_attr = sa_legacy_attrs[i].sa_attr;
+ tb[i].sa_length = sa_legacy_attrs[i].sa_length;
+ tb[i].sa_byteswap = sa_legacy_attrs[i].sa_byteswap;
+ tb[i].sa_registered = B_FALSE;
+ tb[i].sa_name =
+ kmem_zalloc(strlen(sa_legacy_attrs[i].sa_name) +1,
+ KM_SLEEP);
+ (void) strlcpy(tb[i].sa_name,
+ sa_legacy_attrs[i].sa_name,
+ strlen(sa_legacy_attrs[i].sa_name) + 1);
+ }
+ }
+
+ for (i = 0; i != count; i++) {
+ sa_attr_type_t attr_id;
+
+ attr_id = sa->sa_user_table[i];
+ if (tb[attr_id].sa_name)
+ continue;
+
+ tb[attr_id].sa_length = reg_attrs[i].sa_length;
+ tb[attr_id].sa_byteswap = reg_attrs[i].sa_byteswap;
+ tb[attr_id].sa_attr = attr_id;
+ tb[attr_id].sa_name =
+ kmem_zalloc(strlen(reg_attrs[i].sa_name) + 1, KM_SLEEP);
+ (void) strlcpy(tb[attr_id].sa_name, reg_attrs[i].sa_name,
+ strlen(reg_attrs[i].sa_name) + 1);
+ }
+
+ sa->sa_need_attr_registration =
+ (sa_attr_count != registered_count);
+
+ return (0);
+bail:
+ kmem_free(sa->sa_user_table, count * sizeof (sa_attr_type_t));
+ sa->sa_user_table = NULL;
+ sa_free_attr_table(sa);
+ return ((error != 0) ? error : EINVAL);
+}
+
+int
+sa_setup(objset_t *os, uint64_t sa_obj, sa_attr_reg_t *reg_attrs, int count,
+ sa_attr_type_t **user_table)
+{
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ sa_os_t *sa;
+ dmu_objset_type_t ostype = dmu_objset_type(os);
+ sa_attr_type_t *tb;
+ int error;
+
+ mutex_enter(&os->os_lock);
+ if (os->os_sa) {
+ mutex_enter(&os->os_sa->sa_lock);
+ mutex_exit(&os->os_lock);
+ tb = os->os_sa->sa_user_table;
+ mutex_exit(&os->os_sa->sa_lock);
+ *user_table = tb;
+ return (0);
+ }
+
+ sa = kmem_zalloc(sizeof (sa_os_t), KM_SLEEP);
+ mutex_init(&sa->sa_lock, NULL, MUTEX_DEFAULT, NULL);
+ sa->sa_master_obj = sa_obj;
+
+ os->os_sa = sa;
+ mutex_enter(&sa->sa_lock);
+ mutex_exit(&os->os_lock);
+ avl_create(&sa->sa_layout_num_tree, layout_num_compare,
+ sizeof (sa_lot_t), offsetof(sa_lot_t, lot_num_node));
+ avl_create(&sa->sa_layout_hash_tree, layout_hash_compare,
+ sizeof (sa_lot_t), offsetof(sa_lot_t, lot_hash_node));
+
+ if (sa_obj) {
+ error = zap_lookup(os, sa_obj, SA_LAYOUTS,
+ 8, 1, &sa->sa_layout_attr_obj);
+ if (error != 0 && error != ENOENT)
+ goto fail;
+ error = zap_lookup(os, sa_obj, SA_REGISTRY,
+ 8, 1, &sa->sa_reg_attr_obj);
+ if (error != 0 && error != ENOENT)
+ goto fail;
+ }
+
+ if ((error = sa_attr_table_setup(os, reg_attrs, count)) != 0)
+ goto fail;
+
+ if (sa->sa_layout_attr_obj != 0) {
+ uint64_t layout_count;
+
+ error = zap_count(os, sa->sa_layout_attr_obj,
+ &layout_count);
+
+ /*
+ * Layout number count should be > 0
+ */
+ if (error || (error == 0 && layout_count == 0)) {
+ if (error == 0)
+ error = EINVAL;
+ goto fail;
+ }
+
+ for (zap_cursor_init(&zc, os, sa->sa_layout_attr_obj);
+ (error = zap_cursor_retrieve(&zc, &za)) == 0;
+ zap_cursor_advance(&zc)) {
+ sa_attr_type_t *lot_attrs;
+ uint64_t lot_num;
+
+ lot_attrs = kmem_zalloc(sizeof (sa_attr_type_t) *
+ za.za_num_integers, KM_SLEEP);
+
+ if ((error = (zap_lookup(os, sa->sa_layout_attr_obj,
+ za.za_name, 2, za.za_num_integers,
+ lot_attrs))) != 0) {
+ kmem_free(lot_attrs, sizeof (sa_attr_type_t) *
+ za.za_num_integers);
+ break;
+ }
+ VERIFY(ddi_strtoull(za.za_name, NULL, 10,
+ (unsigned long long *)&lot_num) == 0);
+
+ (void) sa_add_layout_entry(os, lot_attrs,
+ za.za_num_integers, lot_num,
+ sa_layout_info_hash(lot_attrs,
+ za.za_num_integers), B_FALSE, NULL);
+ kmem_free(lot_attrs, sizeof (sa_attr_type_t) *
+ za.za_num_integers);
+ }
+ zap_cursor_fini(&zc);
+
+ /*
+ * Make sure layout count matches number of entries added
+ * to AVL tree
+ */
+ if (avl_numnodes(&sa->sa_layout_num_tree) != layout_count) {
+ ASSERT(error != 0);
+ goto fail;
+ }
+ }
+
+ /* Add special layout number for old ZNODES */
+ if (ostype == DMU_OST_ZFS) {
+ (void) sa_add_layout_entry(os, sa_legacy_zpl_layout,
+ sa_legacy_attr_count, 0,
+ sa_layout_info_hash(sa_legacy_zpl_layout,
+ sa_legacy_attr_count), B_FALSE, NULL);
+
+ (void) sa_add_layout_entry(os, sa_dummy_zpl_layout, 0, 1,
+ 0, B_FALSE, NULL);
+ }
+ *user_table = os->os_sa->sa_user_table;
+ mutex_exit(&sa->sa_lock);
+ return (0);
+fail:
+ os->os_sa = NULL;
+ sa_free_attr_table(sa);
+ if (sa->sa_user_table)
+ kmem_free(sa->sa_user_table, sa->sa_user_table_sz);
+ mutex_exit(&sa->sa_lock);
+ kmem_free(sa, sizeof (sa_os_t));
+ return ((error == ECKSUM) ? EIO : error);
+}
+
+void
+sa_tear_down(objset_t *os)
+{
+ sa_os_t *sa = os->os_sa;
+ sa_lot_t *layout;
+ void *cookie;
+
+ kmem_free(sa->sa_user_table, sa->sa_user_table_sz);
+
+ /* Free up attr table */
+
+ sa_free_attr_table(sa);
+
+ cookie = NULL;
+ while (layout = avl_destroy_nodes(&sa->sa_layout_hash_tree, &cookie)) {
+ sa_idx_tab_t *tab;
+ while (tab = list_head(&layout->lot_idx_tab)) {
+ ASSERT(refcount_count(&tab->sa_refcount));
+ sa_idx_tab_rele(os, tab);
+ }
+ }
+
+ cookie = NULL;
+ while (layout = avl_destroy_nodes(&sa->sa_layout_num_tree, &cookie)) {
+ kmem_free(layout->lot_attrs,
+ sizeof (sa_attr_type_t) * layout->lot_attr_count);
+ kmem_free(layout, sizeof (sa_lot_t));
+ }
+
+ avl_destroy(&sa->sa_layout_hash_tree);
+ avl_destroy(&sa->sa_layout_num_tree);
+
+ kmem_free(sa, sizeof (sa_os_t));
+ os->os_sa = NULL;
+}
+
+void
+sa_build_idx_tab(void *hdr, void *attr_addr, sa_attr_type_t attr,
+ uint16_t length, int length_idx, boolean_t var_length, void *userp)
+{
+ sa_idx_tab_t *idx_tab = userp;
+
+ if (var_length) {
+ ASSERT(idx_tab->sa_variable_lengths);
+ idx_tab->sa_variable_lengths[length_idx] = length;
+ }
+ TOC_ATTR_ENCODE(idx_tab->sa_idx_tab[attr], length_idx,
+ (uint32_t)((uintptr_t)attr_addr - (uintptr_t)hdr));
+}
+
+static void
+sa_attr_iter(objset_t *os, sa_hdr_phys_t *hdr, dmu_object_type_t type,
+ sa_iterfunc_t func, sa_lot_t *tab, void *userp)
+{
+ void *data_start;
+ sa_lot_t *tb = tab;
+ sa_lot_t search;
+ avl_index_t loc;
+ sa_os_t *sa = os->os_sa;
+ int i;
+ uint16_t *length_start = NULL;
+ uint8_t length_idx = 0;
+
+ if (tab == NULL) {
+ search.lot_num = SA_LAYOUT_NUM(hdr, type);
+ tb = avl_find(&sa->sa_layout_num_tree, &search, &loc);
+ ASSERT(tb);
+ }
+
+ if (IS_SA_BONUSTYPE(type)) {
+ data_start = (void *)P2ROUNDUP(((uintptr_t)hdr +
+ offsetof(sa_hdr_phys_t, sa_lengths) +
+ (sizeof (uint16_t) * tb->lot_var_sizes)), 8);
+ length_start = hdr->sa_lengths;
+ } else {
+ data_start = hdr;
+ }
+
+ for (i = 0; i != tb->lot_attr_count; i++) {
+ int attr_length, reg_length;
+ uint8_t idx_len;
+
+ reg_length = sa->sa_attr_table[tb->lot_attrs[i]].sa_length;
+ if (reg_length) {
+ attr_length = reg_length;
+ idx_len = 0;
+ } else {
+ attr_length = length_start[length_idx];
+ idx_len = length_idx++;
+ }
+
+ func(hdr, data_start, tb->lot_attrs[i], attr_length,
+ idx_len, reg_length == 0 ? B_TRUE : B_FALSE, userp);
+
+ data_start = (void *)P2ROUNDUP(((uintptr_t)data_start +
+ attr_length), 8);
+ }
+}
+
+/*ARGSUSED*/
+void
+sa_byteswap_cb(void *hdr, void *attr_addr, sa_attr_type_t attr,
+ uint16_t length, int length_idx, boolean_t variable_length, void *userp)
+{
+ sa_handle_t *hdl = userp;
+ sa_os_t *sa = hdl->sa_os->os_sa;
+
+ sa_bswap_table[sa->sa_attr_table[attr].sa_byteswap](attr_addr, length);
+}
+
+void
+sa_byteswap(sa_handle_t *hdl, sa_buf_type_t buftype)
+{
+ sa_hdr_phys_t *sa_hdr_phys = SA_GET_HDR(hdl, buftype);
+ dmu_buf_impl_t *db;
+ sa_os_t *sa = hdl->sa_os->os_sa;
+ int num_lengths = 1;
+ int i;
+
+ ASSERT(MUTEX_HELD(&sa->sa_lock));
+ if (sa_hdr_phys->sa_magic == SA_MAGIC)
+ return;
+
+ db = SA_GET_DB(hdl, buftype);
+
+ if (buftype == SA_SPILL) {
+ arc_release(db->db_buf, NULL);
+ arc_buf_thaw(db->db_buf);
+ }
+
+ sa_hdr_phys->sa_magic = BSWAP_32(sa_hdr_phys->sa_magic);
+ sa_hdr_phys->sa_layout_info = BSWAP_16(sa_hdr_phys->sa_layout_info);
+
+ /*
+ * Determine number of variable lenghts in header
+ * The standard 8 byte header has one for free and a
+ * 16 byte header would have 4 + 1;
+ */
+ if (SA_HDR_SIZE(sa_hdr_phys) > 8)
+ num_lengths += (SA_HDR_SIZE(sa_hdr_phys) - 8) >> 1;
+ for (i = 0; i != num_lengths; i++)
+ sa_hdr_phys->sa_lengths[i] =
+ BSWAP_16(sa_hdr_phys->sa_lengths[i]);
+
+ sa_attr_iter(hdl->sa_os, sa_hdr_phys, DMU_OT_SA,
+ sa_byteswap_cb, NULL, hdl);
+
+ if (buftype == SA_SPILL)
+ arc_buf_freeze(((dmu_buf_impl_t *)hdl->sa_spill)->db_buf);
+}
+
+static int
+sa_build_index(sa_handle_t *hdl, sa_buf_type_t buftype)
+{
+ sa_hdr_phys_t *sa_hdr_phys;
+ dmu_buf_impl_t *db = SA_GET_DB(hdl, buftype);
+ dmu_object_type_t bonustype = SA_BONUSTYPE_FROM_DB(db);
+ sa_os_t *sa = hdl->sa_os->os_sa;
+ sa_idx_tab_t *idx_tab;
+
+ sa_hdr_phys = SA_GET_HDR(hdl, buftype);
+
+ mutex_enter(&sa->sa_lock);
+
+ /* Do we need to byteswap? */
+
+ /* only check if not old znode */
+ if (IS_SA_BONUSTYPE(bonustype) && sa_hdr_phys->sa_magic != SA_MAGIC &&
+ sa_hdr_phys->sa_magic != 0) {
+ VERIFY(BSWAP_32(sa_hdr_phys->sa_magic) == SA_MAGIC);
+ sa_byteswap(hdl, buftype);
+ }
+
+ idx_tab = sa_find_idx_tab(hdl->sa_os, bonustype, sa_hdr_phys);
+
+ if (buftype == SA_BONUS)
+ hdl->sa_bonus_tab = idx_tab;
+ else
+ hdl->sa_spill_tab = idx_tab;
+
+ mutex_exit(&sa->sa_lock);
+ return (0);
+}
+
+/*ARGSUSED*/
+void
+sa_evict(dmu_buf_t *db, void *sap)
+{
+ panic("evicting sa dbuf %p\n", (void *)db);
+}
+
+static void
+sa_idx_tab_rele(objset_t *os, void *arg)
+{
+ sa_os_t *sa = os->os_sa;
+ sa_idx_tab_t *idx_tab = arg;
+
+ if (idx_tab == NULL)
+ return;
+
+ mutex_enter(&sa->sa_lock);
+ if (refcount_remove(&idx_tab->sa_refcount, NULL) == 0) {
+ list_remove(&idx_tab->sa_layout->lot_idx_tab, idx_tab);
+ if (idx_tab->sa_variable_lengths)
+ kmem_free(idx_tab->sa_variable_lengths,
+ sizeof (uint16_t) *
+ idx_tab->sa_layout->lot_var_sizes);
+ refcount_destroy(&idx_tab->sa_refcount);
+ kmem_free(idx_tab->sa_idx_tab,
+ sizeof (uint32_t) * sa->sa_num_attrs);
+ kmem_free(idx_tab, sizeof (sa_idx_tab_t));
+ }
+ mutex_exit(&sa->sa_lock);
+}
+
+static void
+sa_idx_tab_hold(objset_t *os, sa_idx_tab_t *idx_tab)
+{
+ sa_os_t *sa = os->os_sa;
+
+ ASSERT(MUTEX_HELD(&sa->sa_lock));
+ (void) refcount_add(&idx_tab->sa_refcount, NULL);
+}
+
+void
+sa_handle_destroy(sa_handle_t *hdl)
+{
+ mutex_enter(&hdl->sa_lock);
+ (void) dmu_buf_update_user((dmu_buf_t *)hdl->sa_bonus, hdl,
+ NULL, NULL, NULL);
+
+ if (hdl->sa_bonus_tab) {
+ sa_idx_tab_rele(hdl->sa_os, hdl->sa_bonus_tab);
+ hdl->sa_bonus_tab = NULL;
+ }
+ if (hdl->sa_spill_tab) {
+ sa_idx_tab_rele(hdl->sa_os, hdl->sa_spill_tab);
+ hdl->sa_spill_tab = NULL;
+ }
+
+ dmu_buf_rele(hdl->sa_bonus, NULL);
+
+ if (hdl->sa_spill)
+ dmu_buf_rele((dmu_buf_t *)hdl->sa_spill, NULL);
+ mutex_exit(&hdl->sa_lock);
+
+ kmem_cache_free(sa_cache, hdl);
+}
+
+int
+sa_handle_get_from_db(objset_t *os, dmu_buf_t *db, void *userp,
+ sa_handle_type_t hdl_type, sa_handle_t **handlepp)
+{
+ int error = 0;
+ dmu_object_info_t doi;
+ sa_handle_t *handle;
+
+#ifdef ZFS_DEBUG
+ dmu_object_info_from_db(db, &doi);
+ ASSERT(doi.doi_bonus_type == DMU_OT_SA ||
+ doi.doi_bonus_type == DMU_OT_ZNODE);
+#endif
+ /* find handle, if it exists */
+ /* if one doesn't exist then create a new one, and initialize it */
+
+ handle = (hdl_type == SA_HDL_SHARED) ? dmu_buf_get_user(db) : NULL;
+ if (handle == NULL) {
+ sa_handle_t *newhandle;
+ handle = kmem_cache_alloc(sa_cache, KM_SLEEP);
+ handle->sa_userp = userp;
+ handle->sa_bonus = db;
+ handle->sa_os = os;
+ handle->sa_spill = NULL;
+
+ error = sa_build_index(handle, SA_BONUS);
+ newhandle = (hdl_type == SA_HDL_SHARED) ?
+ dmu_buf_set_user_ie(db, handle,
+ NULL, sa_evict) : NULL;
+
+ if (newhandle != NULL) {
+ kmem_cache_free(sa_cache, handle);
+ handle = newhandle;
+ }
+ }
+ *handlepp = handle;
+
+ return (error);
+}
+
+int
+sa_handle_get(objset_t *objset, uint64_t objid, void *userp,
+ sa_handle_type_t hdl_type, sa_handle_t **handlepp)
+{
+ dmu_buf_t *db;
+ int error;
+
+ if (error = dmu_bonus_hold(objset, objid, NULL, &db))
+ return (error);
+
+ return (sa_handle_get_from_db(objset, db, userp, hdl_type,
+ handlepp));
+}
+
+int
+sa_buf_hold(objset_t *objset, uint64_t obj_num, void *tag, dmu_buf_t **db)
+{
+ return (dmu_bonus_hold(objset, obj_num, tag, db));
+}
+
+void
+sa_buf_rele(dmu_buf_t *db, void *tag)
+{
+ dmu_buf_rele(db, tag);
+}
+
+int
+sa_lookup_impl(sa_handle_t *hdl, sa_bulk_attr_t *bulk, int count)
+{
+ ASSERT(hdl);
+ ASSERT(MUTEX_HELD(&hdl->sa_lock));
+ return (sa_attr_op(hdl, bulk, count, SA_LOOKUP, NULL));
+}
+
+int
+sa_lookup(sa_handle_t *hdl, sa_attr_type_t attr, void *buf, uint32_t buflen)
+{
+ int error;
+ sa_bulk_attr_t bulk;
+
+ bulk.sa_attr = attr;
+ bulk.sa_data = buf;
+ bulk.sa_length = buflen;
+ bulk.sa_data_func = NULL;
+
+ ASSERT(hdl);
+ mutex_enter(&hdl->sa_lock);
+ error = sa_lookup_impl(hdl, &bulk, 1);
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+}
+
+#ifdef _KERNEL
+int
+sa_lookup_uio(sa_handle_t *hdl, sa_attr_type_t attr, uio_t *uio)
+{
+ int error;
+ sa_bulk_attr_t bulk;
+
+ bulk.sa_data = NULL;
+ bulk.sa_attr = attr;
+ bulk.sa_data_func = NULL;
+
+ ASSERT(hdl);
+
+ mutex_enter(&hdl->sa_lock);
+ if ((error = sa_attr_op(hdl, &bulk, 1, SA_LOOKUP, NULL)) == 0) {
+ error = uiomove((void *)bulk.sa_addr, MIN(bulk.sa_size,
+ uio->uio_resid), UIO_READ, uio);
+ }
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+
+}
+#endif
+
+void *
+sa_find_idx_tab(objset_t *os, dmu_object_type_t bonustype, void *data)
+{
+ sa_idx_tab_t *idx_tab;
+ sa_hdr_phys_t *hdr = (sa_hdr_phys_t *)data;
+ sa_os_t *sa = os->os_sa;
+ sa_lot_t *tb, search;
+ avl_index_t loc;
+
+ /*
+ * Deterimine layout number. If SA node and header == 0 then
+ * force the index table to the dummy "1" empty layout.
+ *
+ * The layout number would only be zero for a newly created file
+ * that has not added any attributes yet, or with crypto enabled which
+ * doesn't write any attributes to the bonus buffer.
+ */
+
+ search.lot_num = SA_LAYOUT_NUM(hdr, bonustype);
+
+ tb = avl_find(&sa->sa_layout_num_tree, &search, &loc);
+
+ /* Verify header size is consistent with layout information */
+ ASSERT(tb);
+ ASSERT(IS_SA_BONUSTYPE(bonustype) &&
+ SA_HDR_SIZE_MATCH_LAYOUT(hdr, tb) || !IS_SA_BONUSTYPE(bonustype) ||
+ (IS_SA_BONUSTYPE(bonustype) && hdr->sa_layout_info == 0));
+
+ /*
+ * See if any of the already existing TOC entries can be reused?
+ */
+
+ for (idx_tab = list_head(&tb->lot_idx_tab); idx_tab;
+ idx_tab = list_next(&tb->lot_idx_tab, idx_tab)) {
+ boolean_t valid_idx = B_TRUE;
+ int i;
+
+ if (tb->lot_var_sizes != 0 &&
+ idx_tab->sa_variable_lengths != NULL) {
+ for (i = 0; i != tb->lot_var_sizes; i++) {
+ if (hdr->sa_lengths[i] !=
+ idx_tab->sa_variable_lengths[i]) {
+ valid_idx = B_FALSE;
+ break;
+ }
+ }
+ }
+ if (valid_idx) {
+ sa_idx_tab_hold(os, idx_tab);
+ return (idx_tab);
+ }
+ }
+
+ /* No such luck, create a new entry */
+ idx_tab = kmem_zalloc(sizeof (sa_idx_tab_t), KM_SLEEP);
+ idx_tab->sa_idx_tab =
+ kmem_zalloc(sizeof (uint32_t) * sa->sa_num_attrs, KM_SLEEP);
+ idx_tab->sa_layout = tb;
+ refcount_create(&idx_tab->sa_refcount);
+ if (tb->lot_var_sizes)
+ idx_tab->sa_variable_lengths = kmem_alloc(sizeof (uint16_t) *
+ tb->lot_var_sizes, KM_SLEEP);
+
+ sa_attr_iter(os, hdr, bonustype, sa_build_idx_tab,
+ tb, idx_tab);
+ sa_idx_tab_hold(os, idx_tab); /* one hold for consumer */
+ sa_idx_tab_hold(os, idx_tab); /* one for layout */
+ list_insert_tail(&tb->lot_idx_tab, idx_tab);
+ return (idx_tab);
+}
+
+void
+sa_default_locator(void **dataptr, uint32_t *len, uint32_t total_len,
+ boolean_t start, void *userdata)
+{
+ ASSERT(start);
+
+ *dataptr = userdata;
+ *len = total_len;
+}
+
+static void
+sa_attr_register_sync(sa_handle_t *hdl, dmu_tx_t *tx)
+{
+ uint64_t attr_value = 0;
+ sa_os_t *sa = hdl->sa_os->os_sa;
+ sa_attr_table_t *tb = sa->sa_attr_table;
+ int i;
+
+ mutex_enter(&sa->sa_lock);
+
+ if (!sa->sa_need_attr_registration || sa->sa_master_obj == NULL) {
+ mutex_exit(&sa->sa_lock);
+ return;
+ }
+
+ if (sa->sa_reg_attr_obj == NULL) {
+ sa->sa_reg_attr_obj = zap_create(hdl->sa_os,
+ DMU_OT_SA_ATTR_REGISTRATION, DMU_OT_NONE, 0, tx);
+ VERIFY(zap_add(hdl->sa_os, sa->sa_master_obj,
+ SA_REGISTRY, 8, 1, &sa->sa_reg_attr_obj, tx) == 0);
+ }
+ for (i = 0; i != sa->sa_num_attrs; i++) {
+ if (sa->sa_attr_table[i].sa_registered)
+ continue;
+ ATTR_ENCODE(attr_value, tb[i].sa_attr, tb[i].sa_length,
+ tb[i].sa_byteswap);
+ VERIFY(0 == zap_update(hdl->sa_os, sa->sa_reg_attr_obj,
+ tb[i].sa_name, 8, 1, &attr_value, tx));
+ tb[i].sa_registered = B_TRUE;
+ }
+ sa->sa_need_attr_registration = B_FALSE;
+ mutex_exit(&sa->sa_lock);
+}
+
+/*
+ * Replace all attributes with attributes specified in template.
+ * If dnode had a spill buffer then those attributes will be
+ * also be replaced, possibly with just an empty spill block
+ *
+ * This interface is intended to only be used for bulk adding of
+ * attributes for a new file. It will also be used by the ZPL
+ * when converting and old formatted znode to native SA support.
+ */
+int
+sa_replace_all_by_template_locked(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc,
+ int attr_count, dmu_tx_t *tx)
+{
+ sa_os_t *sa = hdl->sa_os->os_sa;
+
+ if (sa->sa_need_attr_registration)
+ sa_attr_register_sync(hdl, tx);
+ return (sa_build_layouts(hdl, attr_desc, attr_count, tx));
+}
+
+int
+sa_replace_all_by_template(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc,
+ int attr_count, dmu_tx_t *tx)
+{
+ int error;
+
+ mutex_enter(&hdl->sa_lock);
+ error = sa_replace_all_by_template_locked(hdl, attr_desc,
+ attr_count, tx);
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+}
+
+/*
+ * add/remove/replace a single attribute and then rewrite the entire set
+ * of attributes.
+ */
+static int
+sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
+ sa_data_op_t action, sa_data_locator_t *locator, void *datastart,
+ uint16_t buflen, dmu_tx_t *tx)
+{
+ sa_os_t *sa = hdl->sa_os->os_sa;
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)hdl->sa_bonus;
+ dnode_t *dn;
+ sa_bulk_attr_t *attr_desc;
+ void *old_data[2];
+ int bonus_attr_count = 0;
+ int bonus_data_size, spill_data_size;
+ int spill_attr_count = 0;
+ int error;
+ uint16_t length;
+ int i, j, k, length_idx;
+ sa_hdr_phys_t *hdr;
+ sa_idx_tab_t *idx_tab;
+ int attr_count;
+ int count;
+
+ ASSERT(MUTEX_HELD(&hdl->sa_lock));
+
+ /* First make of copy of the old data */
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+ if (dn->dn_bonuslen != 0) {
+ bonus_data_size = hdl->sa_bonus->db_size;
+ old_data[0] = kmem_alloc(bonus_data_size, KM_SLEEP);
+ bcopy(hdl->sa_bonus->db_data, old_data[0],
+ hdl->sa_bonus->db_size);
+ bonus_attr_count = hdl->sa_bonus_tab->sa_layout->lot_attr_count;
+ } else {
+ old_data[0] = NULL;
+ }
+ DB_DNODE_EXIT(db);
+
+ /* Bring spill buffer online if it isn't currently */
+
+ if ((error = sa_get_spill(hdl)) == 0) {
+ spill_data_size = hdl->sa_spill->db_size;
+ old_data[1] = kmem_alloc(spill_data_size, KM_SLEEP);
+ bcopy(hdl->sa_spill->db_data, old_data[1],
+ hdl->sa_spill->db_size);
+ spill_attr_count =
+ hdl->sa_spill_tab->sa_layout->lot_attr_count;
+ } else if (error && error != ENOENT) {
+ if (old_data[0])
+ kmem_free(old_data[0], bonus_data_size);
+ return (error);
+ } else {
+ old_data[1] = NULL;
+ }
+
+ /* build descriptor of all attributes */
+
+ attr_count = bonus_attr_count + spill_attr_count;
+ if (action == SA_ADD)
+ attr_count++;
+ else if (action == SA_REMOVE)
+ attr_count--;
+
+ attr_desc = kmem_zalloc(sizeof (sa_bulk_attr_t) * attr_count, KM_SLEEP);
+
+ /*
+ * loop through bonus and spill buffer if it exists, and
+ * build up new attr_descriptor to reset the attributes
+ */
+ k = j = 0;
+ count = bonus_attr_count;
+ hdr = SA_GET_HDR(hdl, SA_BONUS);
+ idx_tab = SA_IDX_TAB_GET(hdl, SA_BONUS);
+ for (; k != 2; k++) {
+ /* iterate over each attribute in layout */
+ for (i = 0, length_idx = 0; i != count; i++) {
+ sa_attr_type_t attr;
+
+ attr = idx_tab->sa_layout->lot_attrs[i];
+ if (attr == newattr) {
+ if (action == SA_REMOVE) {
+ j++;
+ continue;
+ }
+ ASSERT(SA_REGISTERED_LEN(sa, attr) == 0);
+ ASSERT(action == SA_REPLACE);
+ SA_ADD_BULK_ATTR(attr_desc, j, attr,
+ locator, datastart, buflen);
+ } else {
+ length = SA_REGISTERED_LEN(sa, attr);
+ if (length == 0) {
+ length = hdr->sa_lengths[length_idx++];
+ }
+
+ SA_ADD_BULK_ATTR(attr_desc, j, attr,
+ NULL, (void *)
+ (TOC_OFF(idx_tab->sa_idx_tab[attr]) +
+ (uintptr_t)old_data[k]), length);
+ }
+ }
+ if (k == 0 && hdl->sa_spill) {
+ hdr = SA_GET_HDR(hdl, SA_SPILL);
+ idx_tab = SA_IDX_TAB_GET(hdl, SA_SPILL);
+ count = spill_attr_count;
+ } else {
+ break;
+ }
+ }
+ if (action == SA_ADD) {
+ length = SA_REGISTERED_LEN(sa, newattr);
+ if (length == 0) {
+ length = buflen;
+ }
+ SA_ADD_BULK_ATTR(attr_desc, j, newattr, locator,
+ datastart, buflen);
+ }
+
+ error = sa_build_layouts(hdl, attr_desc, attr_count, tx);
+
+ if (old_data[0])
+ kmem_free(old_data[0], bonus_data_size);
+ if (old_data[1])
+ kmem_free(old_data[1], spill_data_size);
+ kmem_free(attr_desc, sizeof (sa_bulk_attr_t) * attr_count);
+
+ return (error);
+}
+
+static int
+sa_bulk_update_impl(sa_handle_t *hdl, sa_bulk_attr_t *bulk, int count,
+ dmu_tx_t *tx)
+{
+ int error;
+ sa_os_t *sa = hdl->sa_os->os_sa;
+ dmu_object_type_t bonustype;
+
+ bonustype = SA_BONUSTYPE_FROM_DB(SA_GET_DB(hdl, SA_BONUS));
+
+ ASSERT(hdl);
+ ASSERT(MUTEX_HELD(&hdl->sa_lock));
+
+ /* sync out registration table if necessary */
+ if (sa->sa_need_attr_registration)
+ sa_attr_register_sync(hdl, tx);
+
+ error = sa_attr_op(hdl, bulk, count, SA_UPDATE, tx);
+ if (error == 0 && !IS_SA_BONUSTYPE(bonustype) && sa->sa_update_cb)
+ sa->sa_update_cb(hdl, tx);
+
+ return (error);
+}
+
+/*
+ * update or add new attribute
+ */
+int
+sa_update(sa_handle_t *hdl, sa_attr_type_t type,
+ void *buf, uint32_t buflen, dmu_tx_t *tx)
+{
+ int error;
+ sa_bulk_attr_t bulk;
+
+ bulk.sa_attr = type;
+ bulk.sa_data_func = NULL;
+ bulk.sa_length = buflen;
+ bulk.sa_data = buf;
+
+ mutex_enter(&hdl->sa_lock);
+ error = sa_bulk_update_impl(hdl, &bulk, 1, tx);
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+}
+
+int
+sa_update_from_cb(sa_handle_t *hdl, sa_attr_type_t attr,
+ uint32_t buflen, sa_data_locator_t *locator, void *userdata, dmu_tx_t *tx)
+{
+ int error;
+ sa_bulk_attr_t bulk;
+
+ bulk.sa_attr = attr;
+ bulk.sa_data = userdata;
+ bulk.sa_data_func = locator;
+ bulk.sa_length = buflen;
+
+ mutex_enter(&hdl->sa_lock);
+ error = sa_bulk_update_impl(hdl, &bulk, 1, tx);
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+}
+
+/*
+ * Return size of an attribute
+ */
+
+int
+sa_size(sa_handle_t *hdl, sa_attr_type_t attr, int *size)
+{
+ sa_bulk_attr_t bulk;
+ int error;
+
+ bulk.sa_data = NULL;
+ bulk.sa_attr = attr;
+ bulk.sa_data_func = NULL;
+
+ ASSERT(hdl);
+ mutex_enter(&hdl->sa_lock);
+ if ((error = sa_attr_op(hdl, &bulk, 1, SA_LOOKUP, NULL)) != 0) {
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+ }
+ *size = bulk.sa_size;
+
+ mutex_exit(&hdl->sa_lock);
+ return (0);
+}
+
+int
+sa_bulk_lookup_locked(sa_handle_t *hdl, sa_bulk_attr_t *attrs, int count)
+{
+ ASSERT(hdl);
+ ASSERT(MUTEX_HELD(&hdl->sa_lock));
+ return (sa_lookup_impl(hdl, attrs, count));
+}
+
+int
+sa_bulk_lookup(sa_handle_t *hdl, sa_bulk_attr_t *attrs, int count)
+{
+ int error;
+
+ ASSERT(hdl);
+ mutex_enter(&hdl->sa_lock);
+ error = sa_bulk_lookup_locked(hdl, attrs, count);
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+}
+
+int
+sa_bulk_update(sa_handle_t *hdl, sa_bulk_attr_t *attrs, int count, dmu_tx_t *tx)
+{
+ int error;
+
+ ASSERT(hdl);
+ mutex_enter(&hdl->sa_lock);
+ error = sa_bulk_update_impl(hdl, attrs, count, tx);
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+}
+
+int
+sa_remove(sa_handle_t *hdl, sa_attr_type_t attr, dmu_tx_t *tx)
+{
+ int error;
+
+ mutex_enter(&hdl->sa_lock);
+ error = sa_modify_attrs(hdl, attr, SA_REMOVE, NULL,
+ NULL, 0, tx);
+ mutex_exit(&hdl->sa_lock);
+ return (error);
+}
+
+void
+sa_object_info(sa_handle_t *hdl, dmu_object_info_t *doi)
+{
+ dmu_object_info_from_db((dmu_buf_t *)hdl->sa_bonus, doi);
+}
+
+void
+sa_object_size(sa_handle_t *hdl, uint32_t *blksize, u_longlong_t *nblocks)
+{
+ dmu_object_size_from_db((dmu_buf_t *)hdl->sa_bonus,
+ blksize, nblocks);
+}
+
+void
+sa_update_user(sa_handle_t *newhdl, sa_handle_t *oldhdl)
+{
+ (void) dmu_buf_update_user((dmu_buf_t *)newhdl->sa_bonus,
+ oldhdl, newhdl, NULL, sa_evict);
+ oldhdl->sa_bonus = NULL;
+}
+
+void
+sa_set_userp(sa_handle_t *hdl, void *ptr)
+{
+ hdl->sa_userp = ptr;
+}
+
+dmu_buf_t *
+sa_get_db(sa_handle_t *hdl)
+{
+ return ((dmu_buf_t *)hdl->sa_bonus);
+}
+
+void *
+sa_get_userdata(sa_handle_t *hdl)
+{
+ return (hdl->sa_userp);
+}
+
+void
+sa_register_update_callback_locked(objset_t *os, sa_update_cb_t *func)
+{
+ ASSERT(MUTEX_HELD(&os->os_sa->sa_lock));
+ os->os_sa->sa_update_cb = func;
+}
+
+void
+sa_register_update_callback(objset_t *os, sa_update_cb_t *func)
+{
+
+ mutex_enter(&os->os_sa->sa_lock);
+ sa_register_update_callback_locked(os, func);
+ mutex_exit(&os->os_sa->sa_lock);
+}
+
+uint64_t
+sa_handle_object(sa_handle_t *hdl)
+{
+ return (hdl->sa_bonus->db_object);
+}
+
+boolean_t
+sa_enabled(objset_t *os)
+{
+ return (os->os_sa == NULL);
+}
+
+int
+sa_set_sa_object(objset_t *os, uint64_t sa_object)
+{
+ sa_os_t *sa = os->os_sa;
+
+ if (sa->sa_master_obj)
+ return (1);
+
+ sa->sa_master_obj = sa_object;
+
+ return (0);
+}
+
+int
+sa_hdrsize(void *arg)
+{
+ sa_hdr_phys_t *hdr = arg;
+
+ return (SA_HDR_SIZE(hdr));
+}
+
+void
+sa_handle_lock(sa_handle_t *hdl)
+{
+ ASSERT(hdl);
+ mutex_enter(&hdl->sa_lock);
+}
+
+void
+sa_handle_unlock(sa_handle_t *hdl)
+{
+ ASSERT(hdl);
+ mutex_exit(&hdl->sa_lock);
+}