--- /dev/null
+/*
+ * 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.
+ * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
+ */
+
+#ifndef _SYS_SA_IMPL_H
+#define _SYS_SA_IMPL_H
+
+#include <sys/dmu.h>
+#include <sys/refcount.h>
+#include <sys/list.h>
+
+/*
+ * Array of known attributes and their
+ * various characteristics.
+ */
+typedef struct sa_attr_table {
+ sa_attr_type_t sa_attr;
+ uint8_t sa_registered;
+ uint16_t sa_length;
+ sa_bswap_type_t sa_byteswap;
+ char *sa_name;
+} sa_attr_table_t;
+
+/*
+ * Zap attribute format for attribute registration
+ *
+ * 64 56 48 40 32 24 16 8 0
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * | unused | len | bswap | attr num |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * Zap attribute format for layout information.
+ *
+ * layout information is stored as an array of attribute numbers
+ * The name of the attribute is the layout number (0, 1, 2, ...)
+ *
+ * 16 0
+ * +---- ---+
+ * | attr # |
+ * +--------+
+ * | attr # |
+ * +--- ----+
+ * ......
+ *
+ */
+
+#define ATTR_BSWAP(x) BF32_GET(x, 16, 8)
+#define ATTR_LENGTH(x) BF32_GET(x, 24, 16)
+#define ATTR_NUM(x) BF32_GET(x, 0, 16)
+#define ATTR_ENCODE(x, attr, length, bswap) \
+{ \
+ BF64_SET(x, 24, 16, length); \
+ BF64_SET(x, 16, 8, bswap); \
+ BF64_SET(x, 0, 16, attr); \
+}
+
+#define TOC_OFF(x) BF32_GET(x, 0, 23)
+#define TOC_ATTR_PRESENT(x) BF32_GET(x, 31, 1)
+#define TOC_LEN_IDX(x) BF32_GET(x, 24, 4)
+#define TOC_ATTR_ENCODE(x, len_idx, offset) \
+{ \
+ BF32_SET(x, 31, 1, 1); \
+ BF32_SET(x, 24, 7, len_idx); \
+ BF32_SET(x, 0, 24, offset); \
+}
+
+#define SA_LAYOUTS "LAYOUTS"
+#define SA_REGISTRY "REGISTRY"
+
+/*
+ * Each unique layout will have their own table
+ * sa_lot (layout_table)
+ */
+typedef struct sa_lot {
+ avl_node_t lot_num_node;
+ avl_node_t lot_hash_node;
+ uint64_t lot_num;
+ uint64_t lot_hash;
+ sa_attr_type_t *lot_attrs; /* array of attr #'s */
+ uint32_t lot_var_sizes; /* how many aren't fixed size */
+ uint32_t lot_attr_count; /* total attr count */
+ list_t lot_idx_tab; /* should be only a couple of entries */
+ int lot_instance; /* used with lot_hash to identify entry */
+} sa_lot_t;
+
+/* index table of offsets */
+typedef struct sa_idx_tab {
+ list_node_t sa_next;
+ sa_lot_t *sa_layout;
+ uint16_t *sa_variable_lengths;
+ refcount_t sa_refcount;
+ uint32_t *sa_idx_tab; /* array of offsets */
+} sa_idx_tab_t;
+
+/*
+ * Since the offset/index information into the actual data
+ * will usually be identical we can share that information with
+ * all handles that have the exact same offsets.
+ *
+ * You would typically only have a large number of different table of
+ * contents if you had a several variable sized attributes.
+ *
+ * Two AVL trees are used to track the attribute layout numbers.
+ * one is keyed by number and will be consulted when a DMU_OT_SA
+ * object is first read. The second tree is keyed by the hash signature
+ * of the attributes and will be consulted when an attribute is added
+ * to determine if we already have an instance of that layout. Both
+ * of these tree's are interconnected. The only difference is that
+ * when an entry is found in the "hash" tree the list of attributes will
+ * need to be compared against the list of attributes you have in hand.
+ * The assumption is that typically attributes will just be updated and
+ * adding a completely new attribute is a very rare operation.
+ */
+struct sa_os {
+ kmutex_t sa_lock;
+ boolean_t sa_need_attr_registration;
+ boolean_t sa_force_spill;
+ uint64_t sa_master_obj;
+ uint64_t sa_reg_attr_obj;
+ uint64_t sa_layout_attr_obj;
+ int sa_num_attrs;
+ sa_attr_table_t *sa_attr_table; /* private attr table */
+ sa_update_cb_t *sa_update_cb;
+ avl_tree_t sa_layout_num_tree; /* keyed by layout number */
+ avl_tree_t sa_layout_hash_tree; /* keyed by layout hash value */
+ int sa_user_table_sz;
+ sa_attr_type_t *sa_user_table; /* user name->attr mapping table */
+};
+
+/*
+ * header for all bonus and spill buffers.
+ *
+ * The header has a fixed portion with a variable number
+ * of "lengths" depending on the number of variable sized
+ * attributes which are determined by the "layout number"
+ */
+
+#define SA_MAGIC 0x2F505A /* ZFS SA */
+typedef struct sa_hdr_phys {
+ uint32_t sa_magic;
+ /*
+ * Encoded with hdrsize and layout number as follows:
+ * 16 10 0
+ * +--------+-------+
+ * | hdrsz |layout |
+ * +--------+-------+
+ *
+ * Bits 0-10 are the layout number
+ * Bits 11-16 are the size of the header.
+ * The hdrsize is the number * 8
+ *
+ * For example.
+ * hdrsz of 1 ==> 8 byte header
+ * 2 ==> 16 byte header
+ *
+ */
+ uint16_t sa_layout_info;
+ uint16_t sa_lengths[1]; /* optional sizes for variable length attrs */
+ /* ... Data follows the lengths. */
+} sa_hdr_phys_t;
+
+#define SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10)
+#define SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 6, 3, 0)
+#define SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \
+{ \
+ BF32_SET_SB(x, 10, 6, 3, 0, size); \
+ BF32_SET(x, 0, 10, num); \
+}
+
+typedef enum sa_buf_type {
+ SA_BONUS = 1,
+ SA_SPILL = 2
+} sa_buf_type_t;
+
+typedef enum sa_data_op {
+ SA_LOOKUP,
+ SA_UPDATE,
+ SA_ADD,
+ SA_REPLACE,
+ SA_REMOVE
+} sa_data_op_t;
+
+/*
+ * Opaque handle used for most sa functions
+ *
+ * This needs to be kept as small as possible.
+ */
+
+struct sa_handle {
+ dmu_buf_user_t sa_dbu;
+ kmutex_t sa_lock;
+ dmu_buf_t *sa_bonus;
+ dmu_buf_t *sa_spill;
+ objset_t *sa_os;
+ void *sa_userp;
+ sa_idx_tab_t *sa_bonus_tab; /* idx of bonus */
+ sa_idx_tab_t *sa_spill_tab; /* only present if spill activated */
+};
+
+#define SA_GET_DB(hdl, type) \
+ (dmu_buf_impl_t *)((type == SA_BONUS) ? hdl->sa_bonus : hdl->sa_spill)
+
+#define SA_GET_HDR(hdl, type) \
+ ((sa_hdr_phys_t *)((dmu_buf_impl_t *)(SA_GET_DB(hdl, \
+ type))->db.db_data))
+
+#define SA_IDX_TAB_GET(hdl, type) \
+ (type == SA_BONUS ? hdl->sa_bonus_tab : hdl->sa_spill_tab)
+
+#define IS_SA_BONUSTYPE(a) \
+ ((a == DMU_OT_SA) ? B_TRUE : B_FALSE)
+
+#define SA_BONUSTYPE_FROM_DB(db) \
+ (dmu_get_bonustype((dmu_buf_t *)db))
+
+#define SA_BLKPTR_SPACE (DN_MAX_BONUSLEN - sizeof (blkptr_t))
+
+#define SA_LAYOUT_NUM(x, type) \
+ ((!IS_SA_BONUSTYPE(type) ? 0 : (((IS_SA_BONUSTYPE(type)) && \
+ ((SA_HDR_LAYOUT_NUM(x)) == 0)) ? 1 : SA_HDR_LAYOUT_NUM(x))))
+
+
+#define SA_REGISTERED_LEN(sa, attr) sa->sa_attr_table[attr].sa_length
+
+#define SA_ATTR_LEN(sa, idx, attr, hdr) ((SA_REGISTERED_LEN(sa, attr) == 0) ?\
+ hdr->sa_lengths[TOC_LEN_IDX(idx->sa_idx_tab[attr])] : \
+ SA_REGISTERED_LEN(sa, attr))
+
+#define SA_SET_HDR(hdr, num, size) \
+ { \
+ hdr->sa_magic = SA_MAGIC; \
+ SA_HDR_LAYOUT_INFO_ENCODE(hdr->sa_layout_info, num, size); \
+ }
+
+#define SA_ATTR_INFO(sa, idx, hdr, attr, bulk, type, hdl) \
+ { \
+ bulk.sa_size = SA_ATTR_LEN(sa, idx, attr, hdr); \
+ bulk.sa_buftype = type; \
+ bulk.sa_addr = \
+ (void *)((uintptr_t)TOC_OFF(idx->sa_idx_tab[attr]) + \
+ (uintptr_t)hdr); \
+}
+
+#define SA_HDR_SIZE_MATCH_LAYOUT(hdr, tb) \
+ (SA_HDR_SIZE(hdr) == (sizeof (sa_hdr_phys_t) + \
+ (tb->lot_var_sizes > 1 ? P2ROUNDUP((tb->lot_var_sizes - 1) * \
+ sizeof (uint16_t), 8) : 0)))
+
+int sa_add_impl(sa_handle_t *, sa_attr_type_t,
+ uint32_t, sa_data_locator_t, void *, dmu_tx_t *);
+
+void sa_register_update_callback_locked(objset_t *, sa_update_cb_t *);
+int sa_size_locked(sa_handle_t *, sa_attr_type_t, int *);
+
+void sa_default_locator(void **, uint32_t *, uint32_t, boolean_t, void *);
+int sa_attr_size(sa_os_t *, sa_idx_tab_t *, sa_attr_type_t,
+ uint16_t *, sa_hdr_phys_t *);
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_SA_IMPL_H */
projects / mirror_ubuntu-artful-kernel.git / blobdiff