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Diffstat (limited to 'uts/common/fs/zfs/sa.c')
| -rw-r--r-- | uts/common/fs/zfs/sa.c | 1971 |
1 files changed, 1971 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..06607d784e42 --- /dev/null +++ b/uts/common/fs/zfs/sa.c @@ -0,0 +1,1971 @@ +/* + * 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. + * Portions Copyright 2011 iXsystems, Inc + * Copyright (c) 2012 by Delphix. 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_link(os, + DMU_OT_SA_ATTR_LAYOUTS, + sa->sa_master_obj, SA_LAYOUTS, tx); + } + + (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 && + *total + P2ROUNDUP(hdrsize, 8) > + (full_space - sizeof (blkptr_t))) { + *index = i; + done = B_TRUE; + } + +next: + if (*total + P2ROUNDUP(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_link(hdl->sa_os, + DMU_OT_SA_ATTR_REGISTRATION, + sa->sa_master_obj, SA_REGISTRY, tx); + } + 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); +} |