[be815bc] | 1 | /*
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[7ae01d5] | 2 | * Copyright (c) 2024 Jiri Svoboda
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[a2aa1dec] | 3 | * Copyright (c) 2008 Jakub Jermar
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[c4bbca8] | 4 | * Copyright (c) 2011 Oleg Romanenko
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[be815bc] | 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | *
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| 11 | * - Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * - Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * - The name of the author may not be used to endorse or promote products
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| 17 | * derived from this software without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 29 | */
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| 30 |
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[b1834a01] | 31 | /** @addtogroup fat
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[be815bc] | 32 | * @{
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[97bc3ee] | 33 | */
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[be815bc] | 34 |
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| 35 | /**
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| 36 | * @file fat_ops.c
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| 37 | * @brief Implementation of VFS operations for the FAT file system server.
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| 38 | */
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| 39 |
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| 40 | #include "fat.h"
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[033ef7d3] | 41 | #include "fat_dentry.h"
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| 42 | #include "fat_fat.h"
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[8a40c49] | 43 | #include "fat_directory.h"
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[6364d3c] | 44 | #include "../../vfs/vfs.h"
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[a2aa1dec] | 45 | #include <libfs.h>
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[f73b291] | 46 | #include <block.h>
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[7a35204a] | 47 | #include <ipc/services.h>
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[15f3c3f] | 48 | #include <ipc/loc.h>
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[ed903174] | 49 | #include <macros.h>
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[be815bc] | 50 | #include <async.h>
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| 51 | #include <errno.h>
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[19f857a] | 52 | #include <str.h>
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[776f2e6] | 53 | #include <byteorder.h>
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[d9c8c81] | 54 | #include <adt/hash_table.h>
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| 55 | #include <adt/list.h>
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[e1e3b26] | 56 | #include <assert.h>
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[1e4cada] | 57 | #include <fibril_synch.h>
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[8d32152] | 58 | #include <align.h>
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[38d150e] | 59 | #include <stdlib.h>
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[e1e3b26] | 60 |
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[b6035ba] | 61 | #define FAT_NODE(node) ((node) ? (fat_node_t *) (node)->data : NULL)
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| 62 | #define FS_NODE(node) ((node) ? (node)->bp : NULL)
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| 63 |
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[7a23d60] | 64 | #define DPS(bs) (BPS((bs)) / sizeof(fat_dentry_t))
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| 65 | #define BPC(bs) (BPS((bs)) * SPC((bs)))
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| 66 |
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[6ebe721] | 67 | /** Mutex protecting the list of cached free FAT nodes. */
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| 68 | static FIBRIL_MUTEX_INITIALIZE(ffn_mutex);
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[add5835] | 69 |
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| 70 | /** List of cached free FAT nodes. */
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[b72efe8] | 71 | static LIST_INITIALIZE(ffn_list);
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[6364d3c] | 72 |
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[0fc1e5d] | 73 | /*
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| 74 | * Forward declarations of FAT libfs operations.
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| 75 | */
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[b7fd2a0] | 76 | static errno_t fat_root_get(fs_node_t **, service_id_t);
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| 77 | static errno_t fat_match(fs_node_t **, fs_node_t *, const char *);
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| 78 | static errno_t fat_node_get(fs_node_t **, service_id_t, fs_index_t);
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| 79 | static errno_t fat_node_open(fs_node_t *);
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| 80 | static errno_t fat_node_put(fs_node_t *);
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| 81 | static errno_t fat_create_node(fs_node_t **, service_id_t, int);
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| 82 | static errno_t fat_destroy_node(fs_node_t *);
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| 83 | static errno_t fat_link(fs_node_t *, fs_node_t *, const char *);
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| 84 | static errno_t fat_unlink(fs_node_t *, fs_node_t *, const char *);
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| 85 | static errno_t fat_has_children(bool *, fs_node_t *);
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[0fc1e5d] | 86 | static fs_index_t fat_index_get(fs_node_t *);
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[ed903174] | 87 | static aoff64_t fat_size_get(fs_node_t *);
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[0fc1e5d] | 88 | static unsigned fat_lnkcnt_get(fs_node_t *);
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| 89 | static bool fat_is_directory(fs_node_t *);
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| 90 | static bool fat_is_file(fs_node_t *node);
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[b33870b] | 91 | static service_id_t fat_service_get(fs_node_t *node);
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[b7fd2a0] | 92 | static errno_t fat_size_block(service_id_t, uint32_t *);
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| 93 | static errno_t fat_total_block_count(service_id_t, uint64_t *);
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| 94 | static errno_t fat_free_block_count(service_id_t, uint64_t *);
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[0fc1e5d] | 95 |
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| 96 | /*
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| 97 | * Helper functions.
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| 98 | */
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[e1e3b26] | 99 | static void fat_node_initialize(fat_node_t *node)
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[a2aa1dec] | 100 | {
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[6ebe721] | 101 | fibril_mutex_initialize(&node->lock);
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[b6035ba] | 102 | node->bp = NULL;
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[869e546] | 103 | node->idx = NULL;
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[e1e3b26] | 104 | node->type = 0;
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| 105 | link_initialize(&node->ffn_link);
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| 106 | node->size = 0;
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| 107 | node->lnkcnt = 0;
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| 108 | node->refcnt = 0;
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| 109 | node->dirty = false;
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[377cce8] | 110 | node->lastc_cached_valid = false;
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[616e73c] | 111 | node->lastc_cached_value = 0;
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[dba4a23] | 112 | node->currc_cached_valid = false;
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| 113 | node->currc_cached_bn = 0;
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[616e73c] | 114 | node->currc_cached_value = 0;
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[e1e3b26] | 115 | }
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| 116 |
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[b7fd2a0] | 117 | static errno_t fat_node_sync(fat_node_t *node)
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[e1e3b26] | 118 | {
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[7858bc5f] | 119 | block_t *b;
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| 120 | fat_bs_t *bs;
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[beb17734] | 121 | fat_dentry_t *d;
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[b7fd2a0] | 122 | errno_t rc;
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[97bc3ee] | 123 |
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[beb17734] | 124 | assert(node->dirty);
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| 125 |
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[15f3c3f] | 126 | bs = block_bb_get(node->idx->service_id);
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[97bc3ee] | 127 |
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[beb17734] | 128 | /* Read the block that contains the dentry of interest. */
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[15f3c3f] | 129 | rc = _fat_block_get(&b, bs, node->idx->service_id, node->idx->pfc,
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[6da81e0] | 130 | NULL, (node->idx->pdi * sizeof(fat_dentry_t)) / BPS(bs),
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[7a23d60] | 131 | BLOCK_FLAGS_NONE);
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[4098e38] | 132 | if (rc != EOK)
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| 133 | return rc;
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[beb17734] | 134 |
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[7a23d60] | 135 | d = ((fat_dentry_t *)b->data) + (node->idx->pdi % DPS(bs));
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[beb17734] | 136 |
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| 137 | d->firstc = host2uint16_t_le(node->firstc);
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[a5da446] | 138 | if (node->type == FAT_FILE) {
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[beb17734] | 139 | d->size = host2uint32_t_le(node->size);
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[a5da446] | 140 | } else if (node->type == FAT_DIRECTORY) {
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| 141 | d->attr = FAT_ATTR_SUBDIR;
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| 142 | }
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[97bc3ee] | 143 |
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[a5da446] | 144 | /* TODO: update other fields? (e.g time fields) */
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[97bc3ee] | 145 |
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[beb17734] | 146 | b->dirty = true; /* need to sync block */
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[c91f2d1b] | 147 | rc = block_put(b);
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[4098e38] | 148 | return rc;
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[e1e3b26] | 149 | }
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| 150 |
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[b7fd2a0] | 151 | static errno_t fat_node_fini_by_service_id(service_id_t service_id)
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[430de97] | 152 | {
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[b7fd2a0] | 153 | errno_t rc;
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[430de97] | 154 |
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| 155 | /*
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| 156 | * We are called from fat_unmounted() and assume that there are already
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| 157 | * no nodes belonging to this instance with non-zero refcount. Therefore
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| 158 | * it is sufficient to clean up only the FAT free node list.
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| 159 | */
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| 160 |
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| 161 | restart:
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| 162 | fibril_mutex_lock(&ffn_mutex);
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[feeac0d] | 163 | list_foreach(ffn_list, ffn_link, fat_node_t, nodep) {
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[430de97] | 164 | if (!fibril_mutex_trylock(&nodep->lock)) {
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| 165 | fibril_mutex_unlock(&ffn_mutex);
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| 166 | goto restart;
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| 167 | }
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| 168 | if (!fibril_mutex_trylock(&nodep->idx->lock)) {
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| 169 | fibril_mutex_unlock(&nodep->lock);
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| 170 | fibril_mutex_unlock(&ffn_mutex);
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| 171 | goto restart;
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| 172 | }
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[15f3c3f] | 173 | if (nodep->idx->service_id != service_id) {
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[430de97] | 174 | fibril_mutex_unlock(&nodep->idx->lock);
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| 175 | fibril_mutex_unlock(&nodep->lock);
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| 176 | continue;
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| 177 | }
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| 178 |
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| 179 | list_remove(&nodep->ffn_link);
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| 180 | fibril_mutex_unlock(&ffn_mutex);
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| 181 |
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| 182 | /*
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| 183 | * We can unlock the node and its index structure because we are
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| 184 | * the last player on this playground and VFS is preventing new
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| 185 | * players from entering.
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| 186 | */
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| 187 | fibril_mutex_unlock(&nodep->idx->lock);
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| 188 | fibril_mutex_unlock(&nodep->lock);
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| 189 |
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| 190 | if (nodep->dirty) {
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| 191 | rc = fat_node_sync(nodep);
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| 192 | if (rc != EOK)
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| 193 | return rc;
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| 194 | }
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| 195 | nodep->idx->nodep = NULL;
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| 196 | free(nodep->bp);
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| 197 | free(nodep);
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| 198 |
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[b72efe8] | 199 | /* Need to restart because we changed ffn_list. */
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[430de97] | 200 | goto restart;
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| 201 | }
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| 202 | fibril_mutex_unlock(&ffn_mutex);
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| 203 |
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| 204 | return EOK;
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| 205 | }
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| 206 |
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[b7fd2a0] | 207 | static errno_t fat_node_get_new(fat_node_t **nodepp)
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[9a3d5f0] | 208 | {
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[b6035ba] | 209 | fs_node_t *fn;
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[9a3d5f0] | 210 | fat_node_t *nodep;
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[b7fd2a0] | 211 | errno_t rc;
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[9a3d5f0] | 212 |
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[6ebe721] | 213 | fibril_mutex_lock(&ffn_mutex);
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[b72efe8] | 214 | if (!list_empty(&ffn_list)) {
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[9a3d5f0] | 215 | /* Try to use a cached free node structure. */
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| 216 | fat_idx_t *idxp_tmp;
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[b72efe8] | 217 | nodep = list_get_instance(list_first(&ffn_list), fat_node_t,
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| 218 | ffn_link);
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[6ebe721] | 219 | if (!fibril_mutex_trylock(&nodep->lock))
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[9a3d5f0] | 220 | goto skip_cache;
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| 221 | idxp_tmp = nodep->idx;
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[6ebe721] | 222 | if (!fibril_mutex_trylock(&idxp_tmp->lock)) {
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| 223 | fibril_mutex_unlock(&nodep->lock);
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[9a3d5f0] | 224 | goto skip_cache;
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| 225 | }
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| 226 | list_remove(&nodep->ffn_link);
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[6ebe721] | 227 | fibril_mutex_unlock(&ffn_mutex);
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[4098e38] | 228 | if (nodep->dirty) {
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| 229 | rc = fat_node_sync(nodep);
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[17bf658] | 230 | if (rc != EOK) {
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| 231 | idxp_tmp->nodep = NULL;
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| 232 | fibril_mutex_unlock(&nodep->lock);
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| 233 | fibril_mutex_unlock(&idxp_tmp->lock);
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| 234 | free(nodep->bp);
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| 235 | free(nodep);
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| 236 | return rc;
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| 237 | }
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[4098e38] | 238 | }
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[9a3d5f0] | 239 | idxp_tmp->nodep = NULL;
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[6ebe721] | 240 | fibril_mutex_unlock(&nodep->lock);
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| 241 | fibril_mutex_unlock(&idxp_tmp->lock);
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[b6035ba] | 242 | fn = FS_NODE(nodep);
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[9a3d5f0] | 243 | } else {
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[18b6a88] | 244 | skip_cache:
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[9a3d5f0] | 245 | /* Try to allocate a new node structure. */
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[6ebe721] | 246 | fibril_mutex_unlock(&ffn_mutex);
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[b6035ba] | 247 | fn = (fs_node_t *)malloc(sizeof(fs_node_t));
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| 248 | if (!fn)
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[17bf658] | 249 | return ENOMEM;
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[9a3d5f0] | 250 | nodep = (fat_node_t *)malloc(sizeof(fat_node_t));
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[b6035ba] | 251 | if (!nodep) {
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| 252 | free(fn);
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[17bf658] | 253 | return ENOMEM;
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[b6035ba] | 254 | }
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[9a3d5f0] | 255 | }
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| 256 | fat_node_initialize(nodep);
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[83937ccd] | 257 | fs_node_initialize(fn);
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[b6035ba] | 258 | fn->data = nodep;
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| 259 | nodep->bp = fn;
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[97bc3ee] | 260 |
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[17bf658] | 261 | *nodepp = nodep;
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| 262 | return EOK;
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[9a3d5f0] | 263 | }
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| 264 |
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[add5835] | 265 | /** Internal version of fat_node_get().
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| 266 | *
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| 267 | * @param idxp Locked index structure.
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| 268 | */
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[b7fd2a0] | 269 | static errno_t fat_node_get_core(fat_node_t **nodepp, fat_idx_t *idxp)
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[e1e3b26] | 270 | {
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[7858bc5f] | 271 | block_t *b;
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| 272 | fat_bs_t *bs;
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[4573a79] | 273 | fat_dentry_t *d;
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[c06dbf9] | 274 | fat_node_t *nodep = NULL;
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[b7fd2a0] | 275 | errno_t rc;
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[4573a79] | 276 |
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[add5835] | 277 | if (idxp->nodep) {
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[4573a79] | 278 | /*
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| 279 | * We are lucky.
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| 280 | * The node is already instantiated in memory.
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| 281 | */
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[6ebe721] | 282 | fibril_mutex_lock(&idxp->nodep->lock);
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[e6bc3a5] | 283 | if (!idxp->nodep->refcnt++) {
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| 284 | fibril_mutex_lock(&ffn_mutex);
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[c06dbf9] | 285 | list_remove(&idxp->nodep->ffn_link);
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[e6bc3a5] | 286 | fibril_mutex_unlock(&ffn_mutex);
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| 287 | }
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[6ebe721] | 288 | fibril_mutex_unlock(&idxp->nodep->lock);
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[0fc1e5d] | 289 | *nodepp = idxp->nodep;
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| 290 | return EOK;
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[4573a79] | 291 | }
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| 292 |
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| 293 | /*
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| 294 | * We must instantiate the node from the file system.
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| 295 | */
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[97bc3ee] | 296 |
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[add5835] | 297 | assert(idxp->pfc);
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[4573a79] | 298 |
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[17bf658] | 299 | rc = fat_node_get_new(&nodep);
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| 300 | if (rc != EOK)
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[0fc1e5d] | 301 | return rc;
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[4573a79] | 302 |
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[15f3c3f] | 303 | bs = block_bb_get(idxp->service_id);
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[4573a79] | 304 |
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[2c4bbcde] | 305 | /* Read the block that contains the dentry of interest. */
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[15f3c3f] | 306 | rc = _fat_block_get(&b, bs, idxp->service_id, idxp->pfc, NULL,
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[7a23d60] | 307 | (idxp->pdi * sizeof(fat_dentry_t)) / BPS(bs), BLOCK_FLAGS_NONE);
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[0fc1e5d] | 308 | if (rc != EOK) {
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| 309 | (void) fat_node_put(FS_NODE(nodep));
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| 310 | return rc;
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| 311 | }
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[4573a79] | 312 |
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[7a23d60] | 313 | d = ((fat_dentry_t *)b->data) + (idxp->pdi % DPS(bs));
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[0182e5cc] | 314 | if (FAT_IS_FAT32(bs)) {
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[1b20da0] | 315 | nodep->firstc = uint16_t_le2host(d->firstc_lo) |
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[0182e5cc] | 316 | (uint16_t_le2host(d->firstc_hi) << 16);
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[7ece4247] | 317 | } else
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[0182e5cc] | 318 | nodep->firstc = uint16_t_le2host(d->firstc);
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| 319 |
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[2c4bbcde] | 320 | if (d->attr & FAT_ATTR_SUBDIR) {
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[97bc3ee] | 321 | /*
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[2c4bbcde] | 322 | * The only directory which does not have this bit set is the
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| 323 | * root directory itself. The root directory node is handled
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| 324 | * and initialized elsewhere.
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| 325 | */
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| 326 | nodep->type = FAT_DIRECTORY;
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[97bc3ee] | 327 |
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[2ab1023] | 328 | /*
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[e2115311] | 329 | * Unfortunately, the 'size' field of the FAT dentry is not
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| 330 | * defined for the directory entry type. We must determine the
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| 331 | * size of the directory by walking the FAT.
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[2ab1023] | 332 | */
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[5a9a1aaf] | 333 | uint32_t clusters;
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[7ece4247] | 334 | rc = fat_clusters_get(&clusters, bs, idxp->service_id,
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| 335 | nodep->firstc);
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[0fc1e5d] | 336 | if (rc != EOK) {
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[9fec913] | 337 | (void) block_put(b);
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[0fc1e5d] | 338 | (void) fat_node_put(FS_NODE(nodep));
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| 339 | return rc;
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| 340 | }
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[7a23d60] | 341 | nodep->size = BPS(bs) * SPC(bs) * clusters;
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[2c4bbcde] | 342 | } else {
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| 343 | nodep->type = FAT_FILE;
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[2ab1023] | 344 | nodep->size = uint32_t_le2host(d->size);
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[2c4bbcde] | 345 | }
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[97bc3ee] | 346 |
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[2c4bbcde] | 347 | nodep->lnkcnt = 1;
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| 348 | nodep->refcnt = 1;
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| 349 |
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[c91f2d1b] | 350 | rc = block_put(b);
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[0fc1e5d] | 351 | if (rc != EOK) {
|
---|
| 352 | (void) fat_node_put(FS_NODE(nodep));
|
---|
| 353 | return rc;
|
---|
| 354 | }
|
---|
[2c4bbcde] | 355 |
|
---|
| 356 | /* Link the idx structure with the node structure. */
|
---|
[add5835] | 357 | nodep->idx = idxp;
|
---|
| 358 | idxp->nodep = nodep;
|
---|
[2c4bbcde] | 359 |
|
---|
[0fc1e5d] | 360 | *nodepp = nodep;
|
---|
| 361 | return EOK;
|
---|
[a2aa1dec] | 362 | }
|
---|
| 363 |
|
---|
[50e5b25] | 364 | /*
|
---|
| 365 | * FAT libfs operations.
|
---|
| 366 | */
|
---|
| 367 |
|
---|
[b7fd2a0] | 368 | errno_t fat_root_get(fs_node_t **rfn, service_id_t service_id)
|
---|
[073f550] | 369 | {
|
---|
[15f3c3f] | 370 | return fat_node_get(rfn, service_id, 0);
|
---|
[073f550] | 371 | }
|
---|
| 372 |
|
---|
[b7fd2a0] | 373 | errno_t fat_match(fs_node_t **rfn, fs_node_t *pfn, const char *component)
|
---|
[073f550] | 374 | {
|
---|
| 375 | fat_node_t *parentp = FAT_NODE(pfn);
|
---|
[cefd3ec] | 376 | char name[FAT_LFN_NAME_SIZE];
|
---|
[073f550] | 377 | fat_dentry_t *d;
|
---|
[15f3c3f] | 378 | service_id_t service_id;
|
---|
[b7fd2a0] | 379 | errno_t rc;
|
---|
[073f550] | 380 |
|
---|
| 381 | fibril_mutex_lock(&parentp->idx->lock);
|
---|
[15f3c3f] | 382 | service_id = parentp->idx->service_id;
|
---|
[a93d79a] | 383 | fibril_mutex_unlock(&parentp->idx->lock);
|
---|
[a35b458] | 384 |
|
---|
[cefd3ec] | 385 | fat_directory_t di;
|
---|
[620a367] | 386 | rc = fat_directory_open(parentp, &di);
|
---|
| 387 | if (rc != EOK)
|
---|
| 388 | return rc;
|
---|
[a93d79a] | 389 |
|
---|
[cefd3ec] | 390 | while (fat_directory_read(&di, name, &d) == EOK) {
|
---|
| 391 | if (fat_dentry_namecmp(name, component) == 0) {
|
---|
| 392 | /* hit */
|
---|
| 393 | fat_node_t *nodep;
|
---|
[7ece4247] | 394 | aoff64_t o = di.pos %
|
---|
| 395 | (BPS(di.bs) / sizeof(fat_dentry_t));
|
---|
[375ab5e] | 396 | fat_idx_t *idx = fat_idx_get_by_pos(service_id,
|
---|
[7ece4247] | 397 | parentp->firstc, di.bnum * DPS(di.bs) + o);
|
---|
[cefd3ec] | 398 | if (!idx) {
|
---|
| 399 | /*
|
---|
| 400 | * Can happen if memory is low or if we
|
---|
| 401 | * run out of 32-bit indices.
|
---|
| 402 | */
|
---|
| 403 | rc = fat_directory_close(&di);
|
---|
| 404 | return (rc == EOK) ? ENOMEM : rc;
|
---|
[073f550] | 405 | }
|
---|
[cefd3ec] | 406 | rc = fat_node_get_core(&nodep, idx);
|
---|
| 407 | fibril_mutex_unlock(&idx->lock);
|
---|
| 408 | if (rc != EOK) {
|
---|
| 409 | (void) fat_directory_close(&di);
|
---|
[1647323] | 410 | return rc;
|
---|
[073f550] | 411 | }
|
---|
[cefd3ec] | 412 | *rfn = FS_NODE(nodep);
|
---|
| 413 | rc = fat_directory_close(&di);
|
---|
| 414 | if (rc != EOK)
|
---|
| 415 | (void) fat_node_put(*rfn);
|
---|
[8810c63] | 416 | return rc;
|
---|
[b85c19a] | 417 | } else {
|
---|
| 418 | rc = fat_directory_next(&di);
|
---|
| 419 | if (rc != EOK)
|
---|
| 420 | break;
|
---|
[cefd3ec] | 421 | }
|
---|
[073f550] | 422 | }
|
---|
[010b52d8] | 423 | (void) fat_directory_close(&di);
|
---|
[073f550] | 424 | *rfn = NULL;
|
---|
| 425 | return EOK;
|
---|
| 426 | }
|
---|
| 427 |
|
---|
[add5835] | 428 | /** Instantiate a FAT in-core node. */
|
---|
[b7fd2a0] | 429 | errno_t fat_node_get(fs_node_t **rfn, service_id_t service_id, fs_index_t index)
|
---|
[add5835] | 430 | {
|
---|
[b6035ba] | 431 | fat_node_t *nodep;
|
---|
[add5835] | 432 | fat_idx_t *idxp;
|
---|
[b7fd2a0] | 433 | errno_t rc;
|
---|
[add5835] | 434 |
|
---|
[15f3c3f] | 435 | idxp = fat_idx_get_by_index(service_id, index);
|
---|
[073f550] | 436 | if (!idxp) {
|
---|
| 437 | *rfn = NULL;
|
---|
| 438 | return EOK;
|
---|
| 439 | }
|
---|
[add5835] | 440 | /* idxp->lock held */
|
---|
[0fc1e5d] | 441 | rc = fat_node_get_core(&nodep, idxp);
|
---|
[6ebe721] | 442 | fibril_mutex_unlock(&idxp->lock);
|
---|
[0fc1e5d] | 443 | if (rc == EOK)
|
---|
| 444 | *rfn = FS_NODE(nodep);
|
---|
| 445 | return rc;
|
---|
[add5835] | 446 | }
|
---|
| 447 |
|
---|
[b7fd2a0] | 448 | errno_t fat_node_open(fs_node_t *fn)
|
---|
[1313ee9] | 449 | {
|
---|
| 450 | /*
|
---|
| 451 | * Opening a file is stateless, nothing
|
---|
| 452 | * to be done here.
|
---|
| 453 | */
|
---|
| 454 | return EOK;
|
---|
| 455 | }
|
---|
| 456 |
|
---|
[b7fd2a0] | 457 | errno_t fat_node_put(fs_node_t *fn)
|
---|
[06901c6b] | 458 | {
|
---|
[b6035ba] | 459 | fat_node_t *nodep = FAT_NODE(fn);
|
---|
[6571b78] | 460 | bool destroy = false;
|
---|
[34b3ce3] | 461 |
|
---|
[6ebe721] | 462 | fibril_mutex_lock(&nodep->lock);
|
---|
[34b3ce3] | 463 | if (!--nodep->refcnt) {
|
---|
[6571b78] | 464 | if (nodep->idx) {
|
---|
[6ebe721] | 465 | fibril_mutex_lock(&ffn_mutex);
|
---|
[b72efe8] | 466 | list_append(&nodep->ffn_link, &ffn_list);
|
---|
[6ebe721] | 467 | fibril_mutex_unlock(&ffn_mutex);
|
---|
[6571b78] | 468 | } else {
|
---|
| 469 | /*
|
---|
| 470 | * The node does not have any index structure associated
|
---|
| 471 | * with itself. This can only mean that we are releasing
|
---|
| 472 | * the node after a failed attempt to allocate the index
|
---|
| 473 | * structure for it.
|
---|
| 474 | */
|
---|
| 475 | destroy = true;
|
---|
| 476 | }
|
---|
[34b3ce3] | 477 | }
|
---|
[6ebe721] | 478 | fibril_mutex_unlock(&nodep->lock);
|
---|
[b6035ba] | 479 | if (destroy) {
|
---|
| 480 | free(nodep->bp);
|
---|
| 481 | free(nodep);
|
---|
| 482 | }
|
---|
[073f550] | 483 | return EOK;
|
---|
[06901c6b] | 484 | }
|
---|
| 485 |
|
---|
[b7fd2a0] | 486 | errno_t fat_create_node(fs_node_t **rfn, service_id_t service_id, int flags)
|
---|
[80e8482] | 487 | {
|
---|
[6571b78] | 488 | fat_idx_t *idxp;
|
---|
| 489 | fat_node_t *nodep;
|
---|
[49df572] | 490 | fat_bs_t *bs;
|
---|
| 491 | fat_cluster_t mcl, lcl;
|
---|
[b7fd2a0] | 492 | errno_t rc;
|
---|
[49df572] | 493 |
|
---|
[15f3c3f] | 494 | bs = block_bb_get(service_id);
|
---|
[49df572] | 495 | if (flags & L_DIRECTORY) {
|
---|
| 496 | /* allocate a cluster */
|
---|
[15f3c3f] | 497 | rc = fat_alloc_clusters(bs, service_id, 1, &mcl, &lcl);
|
---|
[073f550] | 498 | if (rc != EOK)
|
---|
| 499 | return rc;
|
---|
| 500 | /* populate the new cluster with unused dentries */
|
---|
[15f3c3f] | 501 | rc = fat_zero_cluster(bs, service_id, mcl);
|
---|
[fec333b3] | 502 | if (rc != EOK)
|
---|
| 503 | goto error;
|
---|
[49df572] | 504 | }
|
---|
[6571b78] | 505 |
|
---|
[17bf658] | 506 | rc = fat_node_get_new(&nodep);
|
---|
[fec333b3] | 507 | if (rc != EOK)
|
---|
| 508 | goto error;
|
---|
[15f3c3f] | 509 | rc = fat_idx_get_new(&idxp, service_id);
|
---|
[9a15176] | 510 | if (rc != EOK) {
|
---|
[073f550] | 511 | (void) fat_node_put(FS_NODE(nodep));
|
---|
[fec333b3] | 512 | goto error;
|
---|
[6571b78] | 513 | }
|
---|
| 514 | /* idxp->lock held */
|
---|
| 515 | if (flags & L_DIRECTORY) {
|
---|
| 516 | nodep->type = FAT_DIRECTORY;
|
---|
[49df572] | 517 | nodep->firstc = mcl;
|
---|
[7a23d60] | 518 | nodep->size = BPS(bs) * SPC(bs);
|
---|
[6571b78] | 519 | } else {
|
---|
| 520 | nodep->type = FAT_FILE;
|
---|
[49df572] | 521 | nodep->firstc = FAT_CLST_RES0;
|
---|
| 522 | nodep->size = 0;
|
---|
[6571b78] | 523 | }
|
---|
| 524 | nodep->lnkcnt = 0; /* not linked anywhere */
|
---|
| 525 | nodep->refcnt = 1;
|
---|
[49df572] | 526 | nodep->dirty = true;
|
---|
[6571b78] | 527 |
|
---|
| 528 | nodep->idx = idxp;
|
---|
| 529 | idxp->nodep = nodep;
|
---|
| 530 |
|
---|
[6ebe721] | 531 | fibril_mutex_unlock(&idxp->lock);
|
---|
[073f550] | 532 | *rfn = FS_NODE(nodep);
|
---|
| 533 | return EOK;
|
---|
[fec333b3] | 534 |
|
---|
| 535 | error:
|
---|
| 536 | if (flags & L_DIRECTORY)
|
---|
| 537 | (void) fat_free_clusters(bs, service_id, mcl);
|
---|
[1b20da0] | 538 | return rc;
|
---|
[80e8482] | 539 | }
|
---|
| 540 |
|
---|
[b7fd2a0] | 541 | errno_t fat_destroy_node(fs_node_t *fn)
|
---|
[80e8482] | 542 | {
|
---|
[b6035ba] | 543 | fat_node_t *nodep = FAT_NODE(fn);
|
---|
[50e5b25] | 544 | fat_bs_t *bs;
|
---|
[073f550] | 545 | bool has_children;
|
---|
[b7fd2a0] | 546 | errno_t rc;
|
---|
[50e5b25] | 547 |
|
---|
| 548 | /*
|
---|
| 549 | * The node is not reachable from the file system. This means that the
|
---|
| 550 | * link count should be zero and that the index structure cannot be
|
---|
| 551 | * found in the position hash. Obviously, we don't need to lock the node
|
---|
| 552 | * nor its index structure.
|
---|
| 553 | */
|
---|
| 554 | assert(nodep->lnkcnt == 0);
|
---|
| 555 |
|
---|
| 556 | /*
|
---|
| 557 | * The node may not have any children.
|
---|
| 558 | */
|
---|
[073f550] | 559 | rc = fat_has_children(&has_children, fn);
|
---|
| 560 | if (rc != EOK)
|
---|
| 561 | return rc;
|
---|
| 562 | assert(!has_children);
|
---|
[50e5b25] | 563 |
|
---|
[15f3c3f] | 564 | bs = block_bb_get(nodep->idx->service_id);
|
---|
[50e5b25] | 565 | if (nodep->firstc != FAT_CLST_RES0) {
|
---|
| 566 | assert(nodep->size);
|
---|
| 567 | /* Free all clusters allocated to the node. */
|
---|
[15f3c3f] | 568 | rc = fat_free_clusters(bs, nodep->idx->service_id,
|
---|
[cca29e3c] | 569 | nodep->firstc);
|
---|
[50e5b25] | 570 | }
|
---|
| 571 |
|
---|
| 572 | fat_idx_destroy(nodep->idx);
|
---|
[b6035ba] | 573 | free(nodep->bp);
|
---|
[50e5b25] | 574 | free(nodep);
|
---|
[cca29e3c] | 575 | return rc;
|
---|
[80e8482] | 576 | }
|
---|
| 577 |
|
---|
[b7fd2a0] | 578 | errno_t fat_link(fs_node_t *pfn, fs_node_t *cfn, const char *name)
|
---|
[80e8482] | 579 | {
|
---|
[b6035ba] | 580 | fat_node_t *parentp = FAT_NODE(pfn);
|
---|
| 581 | fat_node_t *childp = FAT_NODE(cfn);
|
---|
[0fdd6bb] | 582 | fat_dentry_t *d;
|
---|
| 583 | fat_bs_t *bs;
|
---|
| 584 | block_t *b;
|
---|
[bba3d90] | 585 | fat_directory_t di;
|
---|
| 586 | fat_dentry_t de;
|
---|
[b7fd2a0] | 587 | errno_t rc;
|
---|
[0fdd6bb] | 588 |
|
---|
[6ebe721] | 589 | fibril_mutex_lock(&childp->lock);
|
---|
[0fdd6bb] | 590 | if (childp->lnkcnt == 1) {
|
---|
| 591 | /*
|
---|
| 592 | * On FAT, we don't support multiple hard links.
|
---|
| 593 | */
|
---|
[6ebe721] | 594 | fibril_mutex_unlock(&childp->lock);
|
---|
[0fdd6bb] | 595 | return EMLINK;
|
---|
| 596 | }
|
---|
| 597 | assert(childp->lnkcnt == 0);
|
---|
[6ebe721] | 598 | fibril_mutex_unlock(&childp->lock);
|
---|
[0fdd6bb] | 599 |
|
---|
[af4dec0] | 600 | if (!fat_valid_name(name))
|
---|
[0fdd6bb] | 601 | return ENOTSUP;
|
---|
| 602 |
|
---|
[6ebe721] | 603 | fibril_mutex_lock(&parentp->idx->lock);
|
---|
[15f3c3f] | 604 | bs = block_bb_get(parentp->idx->service_id);
|
---|
[620a367] | 605 | rc = fat_directory_open(parentp, &di);
|
---|
[0be611b] | 606 | if (rc != EOK) {
|
---|
| 607 | fibril_mutex_unlock(&parentp->idx->lock);
|
---|
[4b4668e] | 608 | return rc;
|
---|
[0be611b] | 609 | }
|
---|
[0fdd6bb] | 610 |
|
---|
| 611 | /*
|
---|
| 612 | * At this point we only establish the link between the parent and the
|
---|
| 613 | * child. The dentry, except of the name and the extension, will remain
|
---|
[e32b65a] | 614 | * uninitialized until the corresponding node is synced. Thus the valid
|
---|
| 615 | * dentry data is kept in the child node structure.
|
---|
[0fdd6bb] | 616 | */
|
---|
[bba3d90] | 617 | memset(&de, 0, sizeof(fat_dentry_t));
|
---|
| 618 |
|
---|
| 619 | rc = fat_directory_write(&di, name, &de);
|
---|
[0be611b] | 620 | if (rc != EOK) {
|
---|
| 621 | (void) fat_directory_close(&di);
|
---|
| 622 | fibril_mutex_unlock(&parentp->idx->lock);
|
---|
[bba3d90] | 623 | return rc;
|
---|
[0be611b] | 624 | }
|
---|
[bba3d90] | 625 | rc = fat_directory_close(&di);
|
---|
[0be611b] | 626 | if (rc != EOK) {
|
---|
| 627 | fibril_mutex_unlock(&parentp->idx->lock);
|
---|
[bba3d90] | 628 | return rc;
|
---|
[0be611b] | 629 | }
|
---|
[bba3d90] | 630 |
|
---|
[6ebe721] | 631 | fibril_mutex_unlock(&parentp->idx->lock);
|
---|
[0fdd6bb] | 632 |
|
---|
[6ebe721] | 633 | fibril_mutex_lock(&childp->idx->lock);
|
---|
[97bc3ee] | 634 |
|
---|
[24a2517] | 635 | if (childp->type == FAT_DIRECTORY) {
|
---|
[4b4668e] | 636 | /*
|
---|
[24a2517] | 637 | * If possible, create the Sub-directory Identifier Entry and
|
---|
| 638 | * the Sub-directory Parent Pointer Entry (i.e. "." and "..").
|
---|
| 639 | * These entries are not mandatory according to Standard
|
---|
| 640 | * ECMA-107 and HelenOS VFS does not use them anyway, so this is
|
---|
| 641 | * rather a sign of our good will.
|
---|
[4b4668e] | 642 | */
|
---|
[24a2517] | 643 | rc = fat_block_get(&b, bs, childp, 0, BLOCK_FLAGS_NONE);
|
---|
| 644 | if (rc != EOK) {
|
---|
| 645 | /*
|
---|
| 646 | * Rather than returning an error, simply skip the
|
---|
| 647 | * creation of these two entries.
|
---|
| 648 | */
|
---|
| 649 | goto skip_dots;
|
---|
| 650 | }
|
---|
[ed903174] | 651 | d = (fat_dentry_t *) b->data;
|
---|
| 652 | if ((fat_classify_dentry(d) == FAT_DENTRY_LAST) ||
|
---|
[44ecf89] | 653 | (memcmp(d->name, FAT_NAME_DOT, FAT_NAME_LEN)) == 0) {
|
---|
[24a2517] | 654 | memset(d, 0, sizeof(fat_dentry_t));
|
---|
[b62dc100] | 655 | memcpy(d->name, FAT_NAME_DOT, FAT_NAME_LEN);
|
---|
| 656 | memcpy(d->ext, FAT_EXT_PAD, FAT_EXT_LEN);
|
---|
[24a2517] | 657 | d->attr = FAT_ATTR_SUBDIR;
|
---|
| 658 | d->firstc = host2uint16_t_le(childp->firstc);
|
---|
| 659 | /* TODO: initialize also the date/time members. */
|
---|
| 660 | }
|
---|
| 661 | d++;
|
---|
[ed903174] | 662 | if ((fat_classify_dentry(d) == FAT_DENTRY_LAST) ||
|
---|
[44ecf89] | 663 | (memcmp(d->name, FAT_NAME_DOT_DOT, FAT_NAME_LEN) == 0)) {
|
---|
[24a2517] | 664 | memset(d, 0, sizeof(fat_dentry_t));
|
---|
[b62dc100] | 665 | memcpy(d->name, FAT_NAME_DOT_DOT, FAT_NAME_LEN);
|
---|
| 666 | memcpy(d->ext, FAT_EXT_PAD, FAT_EXT_LEN);
|
---|
[24a2517] | 667 | d->attr = FAT_ATTR_SUBDIR;
|
---|
[b5db2ae] | 668 | d->firstc = (parentp->firstc == FAT_ROOT_CLST(bs)) ?
|
---|
| 669 | host2uint16_t_le(FAT_CLST_ROOTPAR) :
|
---|
[24a2517] | 670 | host2uint16_t_le(parentp->firstc);
|
---|
| 671 | /* TODO: initialize also the date/time members. */
|
---|
| 672 | }
|
---|
| 673 | b->dirty = true; /* need to sync block */
|
---|
| 674 | /*
|
---|
| 675 | * Ignore the return value as we would have fallen through on error
|
---|
| 676 | * anyway.
|
---|
| 677 | */
|
---|
| 678 | (void) block_put(b);
|
---|
[1baec4b] | 679 | }
|
---|
[4b4668e] | 680 | skip_dots:
|
---|
[1baec4b] | 681 |
|
---|
[0fdd6bb] | 682 | childp->idx->pfc = parentp->firstc;
|
---|
[bba3d90] | 683 | childp->idx->pdi = di.pos; /* di.pos holds absolute position of SFN entry */
|
---|
[6ebe721] | 684 | fibril_mutex_unlock(&childp->idx->lock);
|
---|
[0fdd6bb] | 685 |
|
---|
[6ebe721] | 686 | fibril_mutex_lock(&childp->lock);
|
---|
[0fdd6bb] | 687 | childp->lnkcnt = 1;
|
---|
| 688 | childp->dirty = true; /* need to sync node */
|
---|
[6ebe721] | 689 | fibril_mutex_unlock(&childp->lock);
|
---|
[0fdd6bb] | 690 |
|
---|
| 691 | /*
|
---|
| 692 | * Hash in the index structure into the position hash.
|
---|
| 693 | */
|
---|
| 694 | fat_idx_hashin(childp->idx);
|
---|
| 695 |
|
---|
| 696 | return EOK;
|
---|
[80e8482] | 697 | }
|
---|
| 698 |
|
---|
[b7fd2a0] | 699 | errno_t fat_unlink(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
|
---|
[80e8482] | 700 | {
|
---|
[b6035ba] | 701 | fat_node_t *parentp = FAT_NODE(pfn);
|
---|
| 702 | fat_node_t *childp = FAT_NODE(cfn);
|
---|
[073f550] | 703 | bool has_children;
|
---|
[b7fd2a0] | 704 | errno_t rc;
|
---|
[a31c1ccf] | 705 |
|
---|
[770d281] | 706 | if (!parentp)
|
---|
| 707 | return EBUSY;
|
---|
[97bc3ee] | 708 |
|
---|
[073f550] | 709 | rc = fat_has_children(&has_children, cfn);
|
---|
| 710 | if (rc != EOK)
|
---|
| 711 | return rc;
|
---|
| 712 | if (has_children)
|
---|
[0be3e8b] | 713 | return ENOTEMPTY;
|
---|
[770d281] | 714 |
|
---|
[6ebe721] | 715 | fibril_mutex_lock(&parentp->lock);
|
---|
| 716 | fibril_mutex_lock(&childp->lock);
|
---|
[a31c1ccf] | 717 | assert(childp->lnkcnt == 1);
|
---|
[6ebe721] | 718 | fibril_mutex_lock(&childp->idx->lock);
|
---|
[a35b458] | 719 |
|
---|
[b85c19a] | 720 | fat_directory_t di;
|
---|
[7ece4247] | 721 | rc = fat_directory_open(parentp, &di);
|
---|
[97bc3ee] | 722 | if (rc != EOK)
|
---|
[46c0498] | 723 | goto error;
|
---|
[b85c19a] | 724 | rc = fat_directory_seek(&di, childp->idx->pdi);
|
---|
| 725 | if (rc != EOK)
|
---|
| 726 | goto error;
|
---|
| 727 | rc = fat_directory_erase(&di);
|
---|
| 728 | if (rc != EOK)
|
---|
| 729 | goto error;
|
---|
| 730 | rc = fat_directory_close(&di);
|
---|
[46c0498] | 731 | if (rc != EOK)
|
---|
| 732 | goto error;
|
---|
[a31c1ccf] | 733 |
|
---|
| 734 | /* remove the index structure from the position hash */
|
---|
| 735 | fat_idx_hashout(childp->idx);
|
---|
| 736 | /* clear position information */
|
---|
| 737 | childp->idx->pfc = FAT_CLST_RES0;
|
---|
| 738 | childp->idx->pdi = 0;
|
---|
[6ebe721] | 739 | fibril_mutex_unlock(&childp->idx->lock);
|
---|
[a31c1ccf] | 740 | childp->lnkcnt = 0;
|
---|
[5ca5eaa7] | 741 | childp->refcnt++; /* keep the node in memory until destroyed */
|
---|
[a31c1ccf] | 742 | childp->dirty = true;
|
---|
[6ebe721] | 743 | fibril_mutex_unlock(&childp->lock);
|
---|
| 744 | fibril_mutex_unlock(&parentp->lock);
|
---|
[a31c1ccf] | 745 |
|
---|
| 746 | return EOK;
|
---|
[46c0498] | 747 |
|
---|
| 748 | error:
|
---|
[b85c19a] | 749 | (void) fat_directory_close(&di);
|
---|
[46c0498] | 750 | fibril_mutex_unlock(&childp->idx->lock);
|
---|
[b85c19a] | 751 | fibril_mutex_unlock(&childp->lock);
|
---|
| 752 | fibril_mutex_unlock(&parentp->lock);
|
---|
[46c0498] | 753 | return rc;
|
---|
[80e8482] | 754 | }
|
---|
| 755 |
|
---|
[b7fd2a0] | 756 | errno_t fat_has_children(bool *has_children, fs_node_t *fn)
|
---|
[32fb10ed] | 757 | {
|
---|
[7858bc5f] | 758 | fat_bs_t *bs;
|
---|
[b6035ba] | 759 | fat_node_t *nodep = FAT_NODE(fn);
|
---|
[32fb10ed] | 760 | unsigned blocks;
|
---|
[7858bc5f] | 761 | block_t *b;
|
---|
[32fb10ed] | 762 | unsigned i, j;
|
---|
[b7fd2a0] | 763 | errno_t rc;
|
---|
[32fb10ed] | 764 |
|
---|
[073f550] | 765 | if (nodep->type != FAT_DIRECTORY) {
|
---|
| 766 | *has_children = false;
|
---|
| 767 | return EOK;
|
---|
| 768 | }
|
---|
[97bc3ee] | 769 |
|
---|
[6ebe721] | 770 | fibril_mutex_lock(&nodep->idx->lock);
|
---|
[15f3c3f] | 771 | bs = block_bb_get(nodep->idx->service_id);
|
---|
[32fb10ed] | 772 |
|
---|
[7a23d60] | 773 | blocks = nodep->size / BPS(bs);
|
---|
[32fb10ed] | 774 |
|
---|
| 775 | for (i = 0; i < blocks; i++) {
|
---|
| 776 | fat_dentry_t *d;
|
---|
[97bc3ee] | 777 |
|
---|
[684b655] | 778 | rc = fat_block_get(&b, bs, nodep, i, BLOCK_FLAGS_NONE);
|
---|
[073f550] | 779 | if (rc != EOK) {
|
---|
| 780 | fibril_mutex_unlock(&nodep->idx->lock);
|
---|
| 781 | return rc;
|
---|
| 782 | }
|
---|
[7a23d60] | 783 | for (j = 0; j < DPS(bs); j++) {
|
---|
[32fb10ed] | 784 | d = ((fat_dentry_t *)b->data) + j;
|
---|
| 785 | switch (fat_classify_dentry(d)) {
|
---|
| 786 | case FAT_DENTRY_SKIP:
|
---|
[0fdd6bb] | 787 | case FAT_DENTRY_FREE:
|
---|
[39b0a51] | 788 | case FAT_DENTRY_VOLLABEL:
|
---|
[32fb10ed] | 789 | continue;
|
---|
| 790 | case FAT_DENTRY_LAST:
|
---|
[c91f2d1b] | 791 | rc = block_put(b);
|
---|
[6ebe721] | 792 | fibril_mutex_unlock(&nodep->idx->lock);
|
---|
[073f550] | 793 | *has_children = false;
|
---|
[8810c63] | 794 | return rc;
|
---|
[32fb10ed] | 795 | default:
|
---|
| 796 | case FAT_DENTRY_VALID:
|
---|
[c91f2d1b] | 797 | rc = block_put(b);
|
---|
[6ebe721] | 798 | fibril_mutex_unlock(&nodep->idx->lock);
|
---|
[073f550] | 799 | *has_children = true;
|
---|
[8810c63] | 800 | return rc;
|
---|
[32fb10ed] | 801 | }
|
---|
| 802 | }
|
---|
[c91f2d1b] | 803 | rc = block_put(b);
|
---|
[8810c63] | 804 | if (rc != EOK) {
|
---|
| 805 | fibril_mutex_unlock(&nodep->idx->lock);
|
---|
[97bc3ee] | 806 | return rc;
|
---|
[8810c63] | 807 | }
|
---|
[32fb10ed] | 808 | }
|
---|
| 809 |
|
---|
[6ebe721] | 810 | fibril_mutex_unlock(&nodep->idx->lock);
|
---|
[073f550] | 811 | *has_children = false;
|
---|
| 812 | return EOK;
|
---|
| 813 | }
|
---|
| 814 |
|
---|
| 815 | fs_index_t fat_index_get(fs_node_t *fn)
|
---|
| 816 | {
|
---|
| 817 | return FAT_NODE(fn)->idx->index;
|
---|
| 818 | }
|
---|
| 819 |
|
---|
[ed903174] | 820 | aoff64_t fat_size_get(fs_node_t *fn)
|
---|
[073f550] | 821 | {
|
---|
| 822 | return FAT_NODE(fn)->size;
|
---|
[32fb10ed] | 823 | }
|
---|
| 824 |
|
---|
[073f550] | 825 | unsigned fat_lnkcnt_get(fs_node_t *fn)
|
---|
[74ea3c6] | 826 | {
|
---|
[073f550] | 827 | return FAT_NODE(fn)->lnkcnt;
|
---|
[74ea3c6] | 828 | }
|
---|
| 829 |
|
---|
[b6035ba] | 830 | bool fat_is_directory(fs_node_t *fn)
|
---|
[e1e3b26] | 831 | {
|
---|
[b6035ba] | 832 | return FAT_NODE(fn)->type == FAT_DIRECTORY;
|
---|
[e1e3b26] | 833 | }
|
---|
| 834 |
|
---|
[b6035ba] | 835 | bool fat_is_file(fs_node_t *fn)
|
---|
[e1e3b26] | 836 | {
|
---|
[b6035ba] | 837 | return FAT_NODE(fn)->type == FAT_FILE;
|
---|
[e1e3b26] | 838 | }
|
---|
| 839 |
|
---|
[6416ae5] | 840 | service_id_t fat_service_get(fs_node_t *fn)
|
---|
[1313ee9] | 841 | {
|
---|
[f783081] | 842 | return 0;
|
---|
[1313ee9] | 843 | }
|
---|
| 844 |
|
---|
[b7fd2a0] | 845 | errno_t fat_size_block(service_id_t service_id, uint32_t *size)
|
---|
[990ab7d] | 846 | {
|
---|
| 847 | fat_bs_t *bs;
|
---|
[3dd148d] | 848 |
|
---|
[990ab7d] | 849 | bs = block_bb_get(service_id);
|
---|
[3dd148d] | 850 | *size = BPC(bs);
|
---|
[990ab7d] | 851 |
|
---|
[3dd148d] | 852 | return EOK;
|
---|
[990ab7d] | 853 | }
|
---|
| 854 |
|
---|
[b7fd2a0] | 855 | errno_t fat_total_block_count(service_id_t service_id, uint64_t *count)
|
---|
[17a0fb8] | 856 | {
|
---|
| 857 | fat_bs_t *bs;
|
---|
[a35b458] | 858 |
|
---|
[17a0fb8] | 859 | bs = block_bb_get(service_id);
|
---|
[3dd148d] | 860 | *count = (SPC(bs)) ? TS(bs) / SPC(bs) : 0;
|
---|
[17a0fb8] | 861 |
|
---|
[3dd148d] | 862 | return EOK;
|
---|
[17a0fb8] | 863 | }
|
---|
| 864 |
|
---|
[b7fd2a0] | 865 | errno_t fat_free_block_count(service_id_t service_id, uint64_t *count)
|
---|
[0d110908] | 866 | {
|
---|
| 867 | fat_bs_t *bs;
|
---|
[5cd6c84] | 868 | fat_cluster_t e0;
|
---|
[0d110908] | 869 | uint64_t block_count;
|
---|
[b7fd2a0] | 870 | errno_t rc;
|
---|
[5cd6c84] | 871 | uint32_t cluster_no, clusters;
|
---|
[0d110908] | 872 |
|
---|
| 873 | block_count = 0;
|
---|
| 874 | bs = block_bb_get(service_id);
|
---|
[5cd6c84] | 875 | clusters = (SPC(bs)) ? TS(bs) / SPC(bs) : 0;
|
---|
| 876 | for (cluster_no = 0; cluster_no < clusters; cluster_no++) {
|
---|
| 877 | rc = fat_get_cluster(bs, service_id, FAT1, cluster_no, &e0);
|
---|
[0d110908] | 878 | if (rc != EOK)
|
---|
| 879 | return EIO;
|
---|
| 880 |
|
---|
| 881 | if (e0 == FAT_CLST_RES0)
|
---|
| 882 | block_count++;
|
---|
| 883 | }
|
---|
[3dd148d] | 884 | *count = block_count;
|
---|
[a35b458] | 885 |
|
---|
[3dd148d] | 886 | return EOK;
|
---|
[0d110908] | 887 | }
|
---|
| 888 |
|
---|
[a2aa1dec] | 889 | /** libfs operations */
|
---|
| 890 | libfs_ops_t fat_libfs_ops = {
|
---|
[073f550] | 891 | .root_get = fat_root_get,
|
---|
[a2aa1dec] | 892 | .match = fat_match,
|
---|
| 893 | .node_get = fat_node_get,
|
---|
[1313ee9] | 894 | .node_open = fat_node_open,
|
---|
[06901c6b] | 895 | .node_put = fat_node_put,
|
---|
[6571b78] | 896 | .create = fat_create_node,
|
---|
| 897 | .destroy = fat_destroy_node,
|
---|
[80e8482] | 898 | .link = fat_link,
|
---|
| 899 | .unlink = fat_unlink,
|
---|
[073f550] | 900 | .has_children = fat_has_children,
|
---|
[e1e3b26] | 901 | .index_get = fat_index_get,
|
---|
| 902 | .size_get = fat_size_get,
|
---|
| 903 | .lnkcnt_get = fat_lnkcnt_get,
|
---|
| 904 | .is_directory = fat_is_directory,
|
---|
[1313ee9] | 905 | .is_file = fat_is_file,
|
---|
[990ab7d] | 906 | .service_get = fat_service_get,
|
---|
[17a0fb8] | 907 | .size_block = fat_size_block,
|
---|
[0d110908] | 908 | .total_block_count = fat_total_block_count,
|
---|
| 909 | .free_block_count = fat_free_block_count
|
---|
[a2aa1dec] | 910 | };
|
---|
| 911 |
|
---|
[b7fd2a0] | 912 | static errno_t fat_fs_open(service_id_t service_id, enum cache_mode cmode,
|
---|
[39b0a51] | 913 | fs_node_t **rrfn, fat_idx_t **rridxp)
|
---|
[d2c8533] | 914 | {
|
---|
[395df52] | 915 | fat_bs_t *bs;
|
---|
[b7fd2a0] | 916 | errno_t rc;
|
---|
[395df52] | 917 |
|
---|
| 918 | /* initialize libblock */
|
---|
[7ae01d5] | 919 | rc = block_init(service_id);
|
---|
[395df52] | 920 | if (rc != EOK)
|
---|
| 921 | return rc;
|
---|
| 922 |
|
---|
| 923 | /* prepare the boot block */
|
---|
| 924 | rc = block_bb_read(service_id, BS_BLOCK);
|
---|
| 925 | if (rc != EOK) {
|
---|
| 926 | block_fini(service_id);
|
---|
| 927 | return rc;
|
---|
| 928 | }
|
---|
| 929 |
|
---|
| 930 | /* get the buffer with the boot sector */
|
---|
| 931 | bs = block_bb_get(service_id);
|
---|
| 932 |
|
---|
| 933 | if (BPS(bs) != BS_SIZE) {
|
---|
| 934 | block_fini(service_id);
|
---|
| 935 | return ENOTSUP;
|
---|
| 936 | }
|
---|
| 937 |
|
---|
[f1ba5d6] | 938 | /* Initialize the block cache */
|
---|
[15f3c3f] | 939 | rc = block_cache_init(service_id, BPS(bs), 0 /* XXX */, cmode);
|
---|
[f1ba5d6] | 940 | if (rc != EOK) {
|
---|
[15f3c3f] | 941 | block_fini(service_id);
|
---|
[efcebe1] | 942 | return rc;
|
---|
[f1ba5d6] | 943 | }
|
---|
| 944 |
|
---|
[2ffaab5] | 945 | /* Do some simple sanity checks on the file system. */
|
---|
[15f3c3f] | 946 | rc = fat_sanity_check(bs, service_id);
|
---|
[711e1f32] | 947 | if (rc != EOK) {
|
---|
[15f3c3f] | 948 | (void) block_cache_fini(service_id);
|
---|
| 949 | block_fini(service_id);
|
---|
[efcebe1] | 950 | return rc;
|
---|
[711e1f32] | 951 | }
|
---|
| 952 |
|
---|
[15f3c3f] | 953 | rc = fat_idx_init_by_service_id(service_id);
|
---|
[cde485d] | 954 | if (rc != EOK) {
|
---|
[15f3c3f] | 955 | (void) block_cache_fini(service_id);
|
---|
| 956 | block_fini(service_id);
|
---|
[efcebe1] | 957 | return rc;
|
---|
[cde485d] | 958 | }
|
---|
| 959 |
|
---|
[689f036] | 960 | /* Initialize the root node. */
|
---|
[b6035ba] | 961 | fs_node_t *rfn = (fs_node_t *)malloc(sizeof(fs_node_t));
|
---|
| 962 | if (!rfn) {
|
---|
[15f3c3f] | 963 | (void) block_cache_fini(service_id);
|
---|
| 964 | block_fini(service_id);
|
---|
| 965 | fat_idx_fini_by_service_id(service_id);
|
---|
[efcebe1] | 966 | return ENOMEM;
|
---|
[b6035ba] | 967 | }
|
---|
[0182e5cc] | 968 |
|
---|
[83937ccd] | 969 | fs_node_initialize(rfn);
|
---|
[689f036] | 970 | fat_node_t *rootp = (fat_node_t *)malloc(sizeof(fat_node_t));
|
---|
| 971 | if (!rootp) {
|
---|
[b6035ba] | 972 | free(rfn);
|
---|
[15f3c3f] | 973 | (void) block_cache_fini(service_id);
|
---|
| 974 | block_fini(service_id);
|
---|
| 975 | fat_idx_fini_by_service_id(service_id);
|
---|
[efcebe1] | 976 | return ENOMEM;
|
---|
[689f036] | 977 | }
|
---|
| 978 | fat_node_initialize(rootp);
|
---|
| 979 |
|
---|
[15f3c3f] | 980 | fat_idx_t *ridxp = fat_idx_get_by_pos(service_id, FAT_CLST_ROOTPAR, 0);
|
---|
[689f036] | 981 | if (!ridxp) {
|
---|
[b6035ba] | 982 | free(rfn);
|
---|
[689f036] | 983 | free(rootp);
|
---|
[15f3c3f] | 984 | (void) block_cache_fini(service_id);
|
---|
| 985 | block_fini(service_id);
|
---|
| 986 | fat_idx_fini_by_service_id(service_id);
|
---|
[efcebe1] | 987 | return ENOMEM;
|
---|
[689f036] | 988 | }
|
---|
| 989 | assert(ridxp->index == 0);
|
---|
| 990 | /* ridxp->lock held */
|
---|
| 991 |
|
---|
| 992 | rootp->type = FAT_DIRECTORY;
|
---|
[b5db2ae] | 993 | rootp->firstc = FAT_ROOT_CLST(bs);
|
---|
[689f036] | 994 | rootp->refcnt = 1;
|
---|
[5ab597d] | 995 | rootp->lnkcnt = 0; /* FS root is not linked */
|
---|
[b5db2ae] | 996 |
|
---|
| 997 | if (FAT_IS_FAT32(bs)) {
|
---|
[5a9a1aaf] | 998 | uint32_t clusters;
|
---|
[375ab5e] | 999 | rc = fat_clusters_get(&clusters, bs, service_id, rootp->firstc);
|
---|
[b5db2ae] | 1000 | if (rc != EOK) {
|
---|
[32f623d9] | 1001 | fibril_mutex_unlock(&ridxp->lock);
|
---|
[b5db2ae] | 1002 | free(rfn);
|
---|
| 1003 | free(rootp);
|
---|
[375ab5e] | 1004 | (void) block_cache_fini(service_id);
|
---|
| 1005 | block_fini(service_id);
|
---|
| 1006 | fat_idx_fini_by_service_id(service_id);
|
---|
[1940326] | 1007 | return ENOTSUP;
|
---|
[b5db2ae] | 1008 | }
|
---|
| 1009 | rootp->size = BPS(bs) * SPC(bs) * clusters;
|
---|
| 1010 | } else
|
---|
| 1011 | rootp->size = RDE(bs) * sizeof(fat_dentry_t);
|
---|
| 1012 |
|
---|
[39b0a51] | 1013 | rootp->idx = ridxp;
|
---|
| 1014 | ridxp->nodep = rootp;
|
---|
| 1015 | rootp->bp = rfn;
|
---|
| 1016 | rfn->data = rootp;
|
---|
| 1017 |
|
---|
| 1018 | fibril_mutex_unlock(&ridxp->lock);
|
---|
| 1019 |
|
---|
| 1020 | *rrfn = rfn;
|
---|
| 1021 | *rridxp = ridxp;
|
---|
| 1022 |
|
---|
| 1023 | return EOK;
|
---|
| 1024 | }
|
---|
| 1025 |
|
---|
| 1026 | static void fat_fs_close(service_id_t service_id, fs_node_t *rfn)
|
---|
| 1027 | {
|
---|
| 1028 | free(rfn->data);
|
---|
| 1029 | free(rfn);
|
---|
| 1030 | (void) block_cache_fini(service_id);
|
---|
| 1031 | block_fini(service_id);
|
---|
| 1032 | fat_idx_fini_by_service_id(service_id);
|
---|
| 1033 | }
|
---|
| 1034 |
|
---|
| 1035 | /*
|
---|
| 1036 | * FAT VFS_OUT operations.
|
---|
| 1037 | */
|
---|
| 1038 |
|
---|
[b7fd2a0] | 1039 | static errno_t fat_fsprobe(service_id_t service_id, vfs_fs_probe_info_t *info)
|
---|
[39b0a51] | 1040 | {
|
---|
| 1041 | fat_idx_t *ridxp;
|
---|
| 1042 | fs_node_t *rfn;
|
---|
| 1043 | fat_node_t *nodep;
|
---|
| 1044 | fat_directory_t di;
|
---|
| 1045 | char label[FAT_VOLLABEL_LEN + 1];
|
---|
[b7fd2a0] | 1046 | errno_t rc;
|
---|
[39b0a51] | 1047 |
|
---|
| 1048 | rc = fat_fs_open(service_id, CACHE_MODE_WT, &rfn, &ridxp);
|
---|
| 1049 | if (rc != EOK)
|
---|
| 1050 | return rc;
|
---|
| 1051 |
|
---|
| 1052 | nodep = FAT_NODE(rfn);
|
---|
| 1053 |
|
---|
| 1054 | rc = fat_directory_open(nodep, &di);
|
---|
[9f64c1e] | 1055 | if (rc != EOK) {
|
---|
| 1056 | fat_fs_close(service_id, rfn);
|
---|
[39b0a51] | 1057 | return rc;
|
---|
[9f64c1e] | 1058 | }
|
---|
[39b0a51] | 1059 |
|
---|
| 1060 | rc = fat_directory_vollabel_get(&di, label);
|
---|
| 1061 | if (rc != EOK) {
|
---|
[9f64c1e] | 1062 | if (rc != ENOENT) {
|
---|
| 1063 | fat_fs_close(service_id, rfn);
|
---|
[f4ae95a] | 1064 | return rc;
|
---|
[9f64c1e] | 1065 | }
|
---|
[f4ae95a] | 1066 |
|
---|
| 1067 | label[0] = '\0';
|
---|
[39b0a51] | 1068 | }
|
---|
| 1069 |
|
---|
| 1070 | str_cpy(info->label, FS_LABEL_MAXLEN + 1, label);
|
---|
| 1071 |
|
---|
| 1072 | fat_directory_close(&di);
|
---|
| 1073 | fat_fs_close(service_id, rfn);
|
---|
| 1074 |
|
---|
| 1075 | return EOK;
|
---|
| 1076 | }
|
---|
| 1077 |
|
---|
[b7fd2a0] | 1078 | static errno_t
|
---|
[39b0a51] | 1079 | fat_mounted(service_id_t service_id, const char *opts, fs_index_t *index,
|
---|
| 1080 | aoff64_t *size)
|
---|
| 1081 | {
|
---|
| 1082 | enum cache_mode cmode = CACHE_MODE_WB;
|
---|
| 1083 | fat_instance_t *instance;
|
---|
| 1084 | fat_idx_t *ridxp;
|
---|
| 1085 | fs_node_t *rfn;
|
---|
[b7fd2a0] | 1086 | errno_t rc;
|
---|
[39b0a51] | 1087 |
|
---|
| 1088 | instance = malloc(sizeof(fat_instance_t));
|
---|
| 1089 | if (!instance)
|
---|
| 1090 | return ENOMEM;
|
---|
| 1091 | instance->lfn_enabled = true;
|
---|
| 1092 |
|
---|
| 1093 | /* Parse mount options. */
|
---|
| 1094 | char *mntopts = (char *) opts;
|
---|
| 1095 | char *opt;
|
---|
| 1096 | while ((opt = str_tok(mntopts, " ,", &mntopts)) != NULL) {
|
---|
| 1097 | if (str_cmp(opt, "wtcache") == 0)
|
---|
| 1098 | cmode = CACHE_MODE_WT;
|
---|
| 1099 | else if (str_cmp(opt, "nolfn") == 0)
|
---|
| 1100 | instance->lfn_enabled = false;
|
---|
| 1101 | }
|
---|
| 1102 |
|
---|
| 1103 | rc = fat_fs_open(service_id, cmode, &rfn, &ridxp);
|
---|
| 1104 | if (rc != EOK) {
|
---|
| 1105 | free(instance);
|
---|
| 1106 | return rc;
|
---|
| 1107 | }
|
---|
| 1108 |
|
---|
| 1109 | fibril_mutex_lock(&ridxp->lock);
|
---|
| 1110 |
|
---|
[32f623d9] | 1111 | rc = fs_instance_create(service_id, instance);
|
---|
| 1112 | if (rc != EOK) {
|
---|
| 1113 | fibril_mutex_unlock(&ridxp->lock);
|
---|
[39b0a51] | 1114 | fat_fs_close(service_id, rfn);
|
---|
[32f623d9] | 1115 | free(instance);
|
---|
| 1116 | return rc;
|
---|
| 1117 | }
|
---|
| 1118 |
|
---|
[6ebe721] | 1119 | fibril_mutex_unlock(&ridxp->lock);
|
---|
[689f036] | 1120 |
|
---|
[efcebe1] | 1121 | *index = ridxp->index;
|
---|
[39b0a51] | 1122 | *size = FAT_NODE(rfn)->size;
|
---|
[cde485d] | 1123 |
|
---|
[efcebe1] | 1124 | return EOK;
|
---|
[cde485d] | 1125 | }
|
---|
| 1126 |
|
---|
[b7fd2a0] | 1127 | static errno_t fat_update_fat32_fsinfo(service_id_t service_id)
|
---|
[b69e4c0] | 1128 | {
|
---|
| 1129 | fat_bs_t *bs;
|
---|
| 1130 | fat32_fsinfo_t *info;
|
---|
| 1131 | block_t *b;
|
---|
[b7fd2a0] | 1132 | errno_t rc;
|
---|
[b69e4c0] | 1133 |
|
---|
| 1134 | bs = block_bb_get(service_id);
|
---|
| 1135 | assert(FAT_IS_FAT32(bs));
|
---|
| 1136 |
|
---|
| 1137 | rc = block_get(&b, service_id, uint16_t_le2host(bs->fat32.fsinfo_sec),
|
---|
| 1138 | BLOCK_FLAGS_NONE);
|
---|
| 1139 | if (rc != EOK)
|
---|
| 1140 | return rc;
|
---|
| 1141 |
|
---|
| 1142 | info = (fat32_fsinfo_t *) b->data;
|
---|
| 1143 |
|
---|
[44ecf89] | 1144 | if (memcmp(info->sig1, FAT32_FSINFO_SIG1, sizeof(info->sig1)) != 0 ||
|
---|
| 1145 | memcmp(info->sig2, FAT32_FSINFO_SIG2, sizeof(info->sig2)) != 0 ||
|
---|
| 1146 | memcmp(info->sig3, FAT32_FSINFO_SIG3, sizeof(info->sig3)) != 0) {
|
---|
[b69e4c0] | 1147 | (void) block_put(b);
|
---|
| 1148 | return EINVAL;
|
---|
| 1149 | }
|
---|
| 1150 |
|
---|
| 1151 | /* For now, invalidate the counter. */
|
---|
| 1152 | info->free_clusters = host2uint16_t_le(-1);
|
---|
| 1153 |
|
---|
| 1154 | b->dirty = true;
|
---|
| 1155 | return block_put(b);
|
---|
| 1156 | }
|
---|
| 1157 |
|
---|
[b7fd2a0] | 1158 | static errno_t fat_unmounted(service_id_t service_id)
|
---|
[3c11713] | 1159 | {
|
---|
[430de97] | 1160 | fs_node_t *fn;
|
---|
| 1161 | fat_node_t *nodep;
|
---|
[b69e4c0] | 1162 | fat_bs_t *bs;
|
---|
[b7fd2a0] | 1163 | errno_t rc;
|
---|
[430de97] | 1164 |
|
---|
[b69e4c0] | 1165 | bs = block_bb_get(service_id);
|
---|
| 1166 |
|
---|
[15f3c3f] | 1167 | rc = fat_root_get(&fn, service_id);
|
---|
[efcebe1] | 1168 | if (rc != EOK)
|
---|
| 1169 | return rc;
|
---|
[430de97] | 1170 | nodep = FAT_NODE(fn);
|
---|
| 1171 |
|
---|
| 1172 | /*
|
---|
| 1173 | * We expect exactly two references on the root node. One for the
|
---|
| 1174 | * fat_root_get() above and one created in fat_mounted().
|
---|
| 1175 | */
|
---|
| 1176 | if (nodep->refcnt != 2) {
|
---|
| 1177 | (void) fat_node_put(fn);
|
---|
[efcebe1] | 1178 | return EBUSY;
|
---|
[430de97] | 1179 | }
|
---|
[97bc3ee] | 1180 |
|
---|
[b69e4c0] | 1181 | if (FAT_IS_FAT32(bs)) {
|
---|
| 1182 | /*
|
---|
| 1183 | * Attempt to update the FAT32 FS info.
|
---|
| 1184 | */
|
---|
| 1185 | (void) fat_update_fat32_fsinfo(service_id);
|
---|
| 1186 | }
|
---|
| 1187 |
|
---|
[430de97] | 1188 | /*
|
---|
| 1189 | * Put the root node and force it to the FAT free node list.
|
---|
| 1190 | */
|
---|
| 1191 | (void) fat_node_put(fn);
|
---|
| 1192 |
|
---|
| 1193 | /*
|
---|
| 1194 | * Perform cleanup of the node structures, index structures and
|
---|
| 1195 | * associated data. Write back this file system's dirty blocks and
|
---|
| 1196 | * stop using libblock for this instance.
|
---|
| 1197 | */
|
---|
[15f3c3f] | 1198 | (void) fat_node_fini_by_service_id(service_id);
|
---|
[39b0a51] | 1199 | fat_fs_close(service_id, fn);
|
---|
[430de97] | 1200 |
|
---|
[32f623d9] | 1201 | void *data;
|
---|
| 1202 | if (fs_instance_get(service_id, &data) == EOK) {
|
---|
| 1203 | fs_instance_destroy(service_id);
|
---|
| 1204 | free(data);
|
---|
| 1205 | }
|
---|
| 1206 |
|
---|
[efcebe1] | 1207 | return EOK;
|
---|
[be815bc] | 1208 | }
|
---|
| 1209 |
|
---|
[b7fd2a0] | 1210 | static errno_t
|
---|
[86ffa27f] | 1211 | fat_read(service_id_t service_id, fs_index_t index, aoff64_t pos,
|
---|
[efcebe1] | 1212 | size_t *rbytes)
|
---|
[4bf40f6] | 1213 | {
|
---|
[073f550] | 1214 | fs_node_t *fn;
|
---|
[b6035ba] | 1215 | fat_node_t *nodep;
|
---|
[7858bc5f] | 1216 | fat_bs_t *bs;
|
---|
[79d031b] | 1217 | size_t bytes;
|
---|
[7858bc5f] | 1218 | block_t *b;
|
---|
[b7fd2a0] | 1219 | errno_t rc;
|
---|
[79d031b] | 1220 |
|
---|
[15f3c3f] | 1221 | rc = fat_node_get(&fn, service_id, index);
|
---|
[efcebe1] | 1222 | if (rc != EOK)
|
---|
| 1223 | return rc;
|
---|
| 1224 | if (!fn)
|
---|
| 1225 | return ENOENT;
|
---|
[b6035ba] | 1226 | nodep = FAT_NODE(fn);
|
---|
[4bf40f6] | 1227 |
|
---|
[984a9ba] | 1228 | ipc_call_t call;
|
---|
[4bf40f6] | 1229 | size_t len;
|
---|
[984a9ba] | 1230 | if (!async_data_read_receive(&call, &len)) {
|
---|
[b6035ba] | 1231 | fat_node_put(fn);
|
---|
[984a9ba] | 1232 | async_answer_0(&call, EINVAL);
|
---|
[efcebe1] | 1233 | return EINVAL;
|
---|
[4bf40f6] | 1234 | }
|
---|
| 1235 |
|
---|
[15f3c3f] | 1236 | bs = block_bb_get(service_id);
|
---|
[cb682eb] | 1237 |
|
---|
[4bf40f6] | 1238 | if (nodep->type == FAT_FILE) {
|
---|
[ddd1219] | 1239 | /*
|
---|
| 1240 | * Our strategy for regular file reads is to read one block at
|
---|
| 1241 | * most and make use of the possibility to return less data than
|
---|
| 1242 | * requested. This keeps the code very simple.
|
---|
| 1243 | */
|
---|
[0d974d8] | 1244 | if (pos >= nodep->size) {
|
---|
[7d861950] | 1245 | /* reading beyond the EOF */
|
---|
| 1246 | bytes = 0;
|
---|
[984a9ba] | 1247 | (void) async_data_read_finalize(&call, NULL, 0);
|
---|
[0d974d8] | 1248 | } else {
|
---|
[7a23d60] | 1249 | bytes = min(len, BPS(bs) - pos % BPS(bs));
|
---|
[0d974d8] | 1250 | bytes = min(bytes, nodep->size - pos);
|
---|
[7a23d60] | 1251 | rc = fat_block_get(&b, bs, nodep, pos / BPS(bs),
|
---|
[1d8cdb1] | 1252 | BLOCK_FLAGS_NONE);
|
---|
[453f2e75] | 1253 | if (rc != EOK) {
|
---|
| 1254 | fat_node_put(fn);
|
---|
[984a9ba] | 1255 | async_answer_0(&call, rc);
|
---|
[efcebe1] | 1256 | return rc;
|
---|
[453f2e75] | 1257 | }
|
---|
[984a9ba] | 1258 | (void) async_data_read_finalize(&call,
|
---|
[7a23d60] | 1259 | b->data + pos % BPS(bs), bytes);
|
---|
[c91f2d1b] | 1260 | rc = block_put(b);
|
---|
[453f2e75] | 1261 | if (rc != EOK) {
|
---|
| 1262 | fat_node_put(fn);
|
---|
[efcebe1] | 1263 | return rc;
|
---|
[453f2e75] | 1264 | }
|
---|
[0d974d8] | 1265 | }
|
---|
[4bf40f6] | 1266 | } else {
|
---|
[ed903174] | 1267 | aoff64_t spos = pos;
|
---|
[65ccd23] | 1268 | char name[FAT_LFN_NAME_SIZE];
|
---|
[ddd1219] | 1269 | fat_dentry_t *d;
|
---|
| 1270 |
|
---|
[4bf40f6] | 1271 | assert(nodep->type == FAT_DIRECTORY);
|
---|
[7a23d60] | 1272 | assert(nodep->size % BPS(bs) == 0);
|
---|
| 1273 | assert(BPS(bs) % sizeof(fat_dentry_t) == 0);
|
---|
[ddd1219] | 1274 |
|
---|
[8a40c49] | 1275 | fat_directory_t di;
|
---|
[563686b] | 1276 | rc = fat_directory_open(nodep, &di);
|
---|
[7ece4247] | 1277 | if (rc != EOK)
|
---|
| 1278 | goto err;
|
---|
[563686b] | 1279 | rc = fat_directory_seek(&di, pos);
|
---|
| 1280 | if (rc != EOK) {
|
---|
| 1281 | (void) fat_directory_close(&di);
|
---|
| 1282 | goto err;
|
---|
[ddd1219] | 1283 | }
|
---|
| 1284 |
|
---|
[8a40c49] | 1285 | rc = fat_directory_read(&di, name, &d);
|
---|
[7ece4247] | 1286 | if (rc == EOK)
|
---|
| 1287 | goto hit;
|
---|
| 1288 | if (rc == ENOENT)
|
---|
| 1289 | goto miss;
|
---|
[453f2e75] | 1290 |
|
---|
[18b6a88] | 1291 | err:
|
---|
[453f2e75] | 1292 | (void) fat_node_put(fn);
|
---|
[984a9ba] | 1293 | async_answer_0(&call, rc);
|
---|
[efcebe1] | 1294 | return rc;
|
---|
[453f2e75] | 1295 |
|
---|
[18b6a88] | 1296 | miss:
|
---|
[8a40c49] | 1297 | rc = fat_directory_close(&di);
|
---|
[7ece4247] | 1298 | if (rc != EOK)
|
---|
[8a40c49] | 1299 | goto err;
|
---|
| 1300 | rc = fat_node_put(fn);
|
---|
[984a9ba] | 1301 | async_answer_0(&call, rc != EOK ? rc : ENOENT);
|
---|
[a33f0a6] | 1302 | *rbytes = 0;
|
---|
| 1303 | return rc != EOK ? rc : ENOENT;
|
---|
[8a40c49] | 1304 |
|
---|
[18b6a88] | 1305 | hit:
|
---|
[8a40c49] | 1306 | pos = di.pos;
|
---|
| 1307 | rc = fat_directory_close(&di);
|
---|
[7ece4247] | 1308 | if (rc != EOK)
|
---|
[8a40c49] | 1309 | goto err;
|
---|
[984a9ba] | 1310 | (void) async_data_read_finalize(&call, name,
|
---|
[7ece4247] | 1311 | str_size(name) + 1);
|
---|
| 1312 | bytes = (pos - spos) + 1;
|
---|
[4bf40f6] | 1313 | }
|
---|
| 1314 |
|
---|
[453f2e75] | 1315 | rc = fat_node_put(fn);
|
---|
[efcebe1] | 1316 | *rbytes = bytes;
|
---|
| 1317 | return rc;
|
---|
[4bf40f6] | 1318 | }
|
---|
| 1319 |
|
---|
[b7fd2a0] | 1320 | static errno_t
|
---|
[86ffa27f] | 1321 | fat_write(service_id_t service_id, fs_index_t index, aoff64_t pos,
|
---|
[efcebe1] | 1322 | size_t *wbytes, aoff64_t *nsize)
|
---|
[c947dda] | 1323 | {
|
---|
[073f550] | 1324 | fs_node_t *fn;
|
---|
[b6035ba] | 1325 | fat_node_t *nodep;
|
---|
[7858bc5f] | 1326 | fat_bs_t *bs;
|
---|
[efcebe1] | 1327 | size_t bytes;
|
---|
[7858bc5f] | 1328 | block_t *b;
|
---|
[ed903174] | 1329 | aoff64_t boundary;
|
---|
[1d8cdb1] | 1330 | int flags = BLOCK_FLAGS_NONE;
|
---|
[b7fd2a0] | 1331 | errno_t rc;
|
---|
[a35b458] | 1332 |
|
---|
[15f3c3f] | 1333 | rc = fat_node_get(&fn, service_id, index);
|
---|
[efcebe1] | 1334 | if (rc != EOK)
|
---|
| 1335 | return rc;
|
---|
| 1336 | if (!fn)
|
---|
| 1337 | return ENOENT;
|
---|
[b6035ba] | 1338 | nodep = FAT_NODE(fn);
|
---|
[97bc3ee] | 1339 |
|
---|
[984a9ba] | 1340 | ipc_call_t call;
|
---|
[8d32152] | 1341 | size_t len;
|
---|
[984a9ba] | 1342 | if (!async_data_write_receive(&call, &len)) {
|
---|
[dfddfcd] | 1343 | (void) fat_node_put(fn);
|
---|
[984a9ba] | 1344 | async_answer_0(&call, EINVAL);
|
---|
[efcebe1] | 1345 | return EINVAL;
|
---|
[8d32152] | 1346 | }
|
---|
| 1347 |
|
---|
[15f3c3f] | 1348 | bs = block_bb_get(service_id);
|
---|
[913a821c] | 1349 |
|
---|
[8d32152] | 1350 | /*
|
---|
| 1351 | * In all scenarios, we will attempt to write out only one block worth
|
---|
| 1352 | * of data at maximum. There might be some more efficient approaches,
|
---|
| 1353 | * but this one greatly simplifies fat_write(). Note that we can afford
|
---|
| 1354 | * to do this because the client must be ready to handle the return
|
---|
[97bc3ee] | 1355 | * value signalizing a smaller number of bytes written.
|
---|
| 1356 | */
|
---|
[7a23d60] | 1357 | bytes = min(len, BPS(bs) - pos % BPS(bs));
|
---|
| 1358 | if (bytes == BPS(bs))
|
---|
[1d8cdb1] | 1359 | flags |= BLOCK_FLAGS_NOREAD;
|
---|
[97bc3ee] | 1360 |
|
---|
[7a23d60] | 1361 | boundary = ROUND_UP(nodep->size, BPC(bs));
|
---|
[b4b7187] | 1362 | if (pos < boundary) {
|
---|
[8d32152] | 1363 | /*
|
---|
| 1364 | * This is the easier case - we are either overwriting already
|
---|
| 1365 | * existing contents or writing behind the EOF, but still within
|
---|
| 1366 | * the limits of the last cluster. The node size may grow to the
|
---|
| 1367 | * next block size boundary.
|
---|
| 1368 | */
|
---|
[cca29e3c] | 1369 | rc = fat_fill_gap(bs, nodep, FAT_CLST_RES0, pos);
|
---|
[dfddfcd] | 1370 | if (rc != EOK) {
|
---|
| 1371 | (void) fat_node_put(fn);
|
---|
[984a9ba] | 1372 | async_answer_0(&call, rc);
|
---|
[efcebe1] | 1373 | return rc;
|
---|
[dfddfcd] | 1374 | }
|
---|
[7a23d60] | 1375 | rc = fat_block_get(&b, bs, nodep, pos / BPS(bs), flags);
|
---|
[dfddfcd] | 1376 | if (rc != EOK) {
|
---|
| 1377 | (void) fat_node_put(fn);
|
---|
[984a9ba] | 1378 | async_answer_0(&call, rc);
|
---|
[efcebe1] | 1379 | return rc;
|
---|
[dfddfcd] | 1380 | }
|
---|
[984a9ba] | 1381 | (void) async_data_write_finalize(&call,
|
---|
[7a23d60] | 1382 | b->data + pos % BPS(bs), bytes);
|
---|
[8d32152] | 1383 | b->dirty = true; /* need to sync block */
|
---|
[c91f2d1b] | 1384 | rc = block_put(b);
|
---|
[dfddfcd] | 1385 | if (rc != EOK) {
|
---|
| 1386 | (void) fat_node_put(fn);
|
---|
[efcebe1] | 1387 | return rc;
|
---|
[dfddfcd] | 1388 | }
|
---|
[8d32152] | 1389 | if (pos + bytes > nodep->size) {
|
---|
| 1390 | nodep->size = pos + bytes;
|
---|
| 1391 | nodep->dirty = true; /* need to sync node */
|
---|
| 1392 | }
|
---|
[efcebe1] | 1393 | *wbytes = bytes;
|
---|
| 1394 | *nsize = nodep->size;
|
---|
[dfddfcd] | 1395 | rc = fat_node_put(fn);
|
---|
[efcebe1] | 1396 | return rc;
|
---|
[8d32152] | 1397 | } else {
|
---|
| 1398 | /*
|
---|
| 1399 | * This is the more difficult case. We must allocate new
|
---|
| 1400 | * clusters for the node and zero them out.
|
---|
| 1401 | */
|
---|
| 1402 | unsigned nclsts;
|
---|
[97bc3ee] | 1403 | fat_cluster_t mcl, lcl;
|
---|
| 1404 |
|
---|
[7a23d60] | 1405 | nclsts = (ROUND_UP(pos + bytes, BPC(bs)) - boundary) / BPC(bs);
|
---|
[6f2dfd1] | 1406 | /* create an independent chain of nclsts clusters in all FATs */
|
---|
[15f3c3f] | 1407 | rc = fat_alloc_clusters(bs, service_id, nclsts, &mcl, &lcl);
|
---|
[dfddfcd] | 1408 | if (rc != EOK) {
|
---|
[6f2dfd1] | 1409 | /* could not allocate a chain of nclsts clusters */
|
---|
[dfddfcd] | 1410 | (void) fat_node_put(fn);
|
---|
[984a9ba] | 1411 | async_answer_0(&call, rc);
|
---|
[efcebe1] | 1412 | return rc;
|
---|
[6f2dfd1] | 1413 | }
|
---|
| 1414 | /* zero fill any gaps */
|
---|
[cca29e3c] | 1415 | rc = fat_fill_gap(bs, nodep, mcl, pos);
|
---|
[dfddfcd] | 1416 | if (rc != EOK) {
|
---|
[15f3c3f] | 1417 | (void) fat_free_clusters(bs, service_id, mcl);
|
---|
[dfddfcd] | 1418 | (void) fat_node_put(fn);
|
---|
[984a9ba] | 1419 | async_answer_0(&call, rc);
|
---|
[efcebe1] | 1420 | return rc;
|
---|
[dfddfcd] | 1421 | }
|
---|
[15f3c3f] | 1422 | rc = _fat_block_get(&b, bs, service_id, lcl, NULL,
|
---|
[7a23d60] | 1423 | (pos / BPS(bs)) % SPC(bs), flags);
|
---|
[dfddfcd] | 1424 | if (rc != EOK) {
|
---|
[15f3c3f] | 1425 | (void) fat_free_clusters(bs, service_id, mcl);
|
---|
[dfddfcd] | 1426 | (void) fat_node_put(fn);
|
---|
[984a9ba] | 1427 | async_answer_0(&call, rc);
|
---|
[efcebe1] | 1428 | return rc;
|
---|
[dfddfcd] | 1429 | }
|
---|
[984a9ba] | 1430 | (void) async_data_write_finalize(&call,
|
---|
[7a23d60] | 1431 | b->data + pos % BPS(bs), bytes);
|
---|
[b4b7187] | 1432 | b->dirty = true; /* need to sync block */
|
---|
[c91f2d1b] | 1433 | rc = block_put(b);
|
---|
[dfddfcd] | 1434 | if (rc != EOK) {
|
---|
[15f3c3f] | 1435 | (void) fat_free_clusters(bs, service_id, mcl);
|
---|
[dfddfcd] | 1436 | (void) fat_node_put(fn);
|
---|
[efcebe1] | 1437 | return rc;
|
---|
[dfddfcd] | 1438 | }
|
---|
[6f2dfd1] | 1439 | /*
|
---|
| 1440 | * Append the cluster chain starting in mcl to the end of the
|
---|
| 1441 | * node's cluster chain.
|
---|
| 1442 | */
|
---|
[377cce8] | 1443 | rc = fat_append_clusters(bs, nodep, mcl, lcl);
|
---|
[dfddfcd] | 1444 | if (rc != EOK) {
|
---|
[15f3c3f] | 1445 | (void) fat_free_clusters(bs, service_id, mcl);
|
---|
[dfddfcd] | 1446 | (void) fat_node_put(fn);
|
---|
[efcebe1] | 1447 | return rc;
|
---|
[dfddfcd] | 1448 | }
|
---|
[efcebe1] | 1449 | *nsize = nodep->size = pos + bytes;
|
---|
[dfddfcd] | 1450 | rc = fat_node_put(fn);
|
---|
[efcebe1] | 1451 | nodep->dirty = true; /* need to sync node */
|
---|
| 1452 | *wbytes = bytes;
|
---|
| 1453 | return rc;
|
---|
[8d32152] | 1454 | }
|
---|
[c947dda] | 1455 | }
|
---|
| 1456 |
|
---|
[b7fd2a0] | 1457 | static errno_t
|
---|
[86ffa27f] | 1458 | fat_truncate(service_id_t service_id, fs_index_t index, aoff64_t size)
|
---|
[6c71a1f] | 1459 | {
|
---|
[073f550] | 1460 | fs_node_t *fn;
|
---|
[b6035ba] | 1461 | fat_node_t *nodep;
|
---|
[913a821c] | 1462 | fat_bs_t *bs;
|
---|
[b7fd2a0] | 1463 | errno_t rc;
|
---|
[8334a427] | 1464 |
|
---|
[15f3c3f] | 1465 | rc = fat_node_get(&fn, service_id, index);
|
---|
[efcebe1] | 1466 | if (rc != EOK)
|
---|
| 1467 | return rc;
|
---|
| 1468 | if (!fn)
|
---|
| 1469 | return ENOENT;
|
---|
[b6035ba] | 1470 | nodep = FAT_NODE(fn);
|
---|
[8334a427] | 1471 |
|
---|
[15f3c3f] | 1472 | bs = block_bb_get(service_id);
|
---|
[913a821c] | 1473 |
|
---|
[8334a427] | 1474 | if (nodep->size == size) {
|
---|
| 1475 | rc = EOK;
|
---|
| 1476 | } else if (nodep->size < size) {
|
---|
| 1477 | /*
|
---|
[913a821c] | 1478 | * The standard says we have the freedom to grow the node.
|
---|
[8334a427] | 1479 | * For now, we simply return an error.
|
---|
| 1480 | */
|
---|
| 1481 | rc = EINVAL;
|
---|
[7a23d60] | 1482 | } else if (ROUND_UP(nodep->size, BPC(bs)) == ROUND_UP(size, BPC(bs))) {
|
---|
[913a821c] | 1483 | /*
|
---|
| 1484 | * The node will be shrunk, but no clusters will be deallocated.
|
---|
| 1485 | */
|
---|
| 1486 | nodep->size = size;
|
---|
| 1487 | nodep->dirty = true; /* need to sync node */
|
---|
[97bc3ee] | 1488 | rc = EOK;
|
---|
[8334a427] | 1489 | } else {
|
---|
| 1490 | /*
|
---|
[913a821c] | 1491 | * The node will be shrunk, clusters will be deallocated.
|
---|
[8334a427] | 1492 | */
|
---|
[913a821c] | 1493 | if (size == 0) {
|
---|
[cca29e3c] | 1494 | rc = fat_chop_clusters(bs, nodep, FAT_CLST_RES0);
|
---|
| 1495 | if (rc != EOK)
|
---|
| 1496 | goto out;
|
---|
[913a821c] | 1497 | } else {
|
---|
| 1498 | fat_cluster_t lastc;
|
---|
[15f3c3f] | 1499 | rc = fat_cluster_walk(bs, service_id, nodep->firstc,
|
---|
[7a23d60] | 1500 | &lastc, NULL, (size - 1) / BPC(bs));
|
---|
[e402382] | 1501 | if (rc != EOK)
|
---|
| 1502 | goto out;
|
---|
[cca29e3c] | 1503 | rc = fat_chop_clusters(bs, nodep, lastc);
|
---|
| 1504 | if (rc != EOK)
|
---|
| 1505 | goto out;
|
---|
[913a821c] | 1506 | }
|
---|
| 1507 | nodep->size = size;
|
---|
| 1508 | nodep->dirty = true; /* need to sync node */
|
---|
[97bc3ee] | 1509 | rc = EOK;
|
---|
[8334a427] | 1510 | }
|
---|
[e402382] | 1511 | out:
|
---|
[b6035ba] | 1512 | fat_node_put(fn);
|
---|
[efcebe1] | 1513 | return rc;
|
---|
[6c71a1f] | 1514 | }
|
---|
| 1515 |
|
---|
[b7fd2a0] | 1516 | static errno_t fat_close(service_id_t service_id, fs_index_t index)
|
---|
[c20aa06] | 1517 | {
|
---|
[efcebe1] | 1518 | return EOK;
|
---|
[c20aa06] | 1519 | }
|
---|
| 1520 |
|
---|
[b7fd2a0] | 1521 | static errno_t fat_destroy(service_id_t service_id, fs_index_t index)
|
---|
[50e5b25] | 1522 | {
|
---|
[073f550] | 1523 | fs_node_t *fn;
|
---|
[5ca5eaa7] | 1524 | fat_node_t *nodep;
|
---|
[b7fd2a0] | 1525 | errno_t rc;
|
---|
[50e5b25] | 1526 |
|
---|
[15f3c3f] | 1527 | rc = fat_node_get(&fn, service_id, index);
|
---|
[efcebe1] | 1528 | if (rc != EOK)
|
---|
| 1529 | return rc;
|
---|
| 1530 | if (!fn)
|
---|
| 1531 | return ENOENT;
|
---|
[50e5b25] | 1532 |
|
---|
[5ca5eaa7] | 1533 | nodep = FAT_NODE(fn);
|
---|
| 1534 | /*
|
---|
| 1535 | * We should have exactly two references. One for the above
|
---|
| 1536 | * call to fat_node_get() and one from fat_unlink().
|
---|
| 1537 | */
|
---|
| 1538 | assert(nodep->refcnt == 2);
|
---|
| 1539 |
|
---|
[b6035ba] | 1540 | rc = fat_destroy_node(fn);
|
---|
[efcebe1] | 1541 | return rc;
|
---|
[c20aa06] | 1542 | }
|
---|
| 1543 |
|
---|
[b7fd2a0] | 1544 | static errno_t fat_sync(service_id_t service_id, fs_index_t index)
|
---|
[c20aa06] | 1545 | {
|
---|
[69a60c4] | 1546 | fs_node_t *fn;
|
---|
[b7fd2a0] | 1547 | errno_t rc = fat_node_get(&fn, service_id, index);
|
---|
[efcebe1] | 1548 | if (rc != EOK)
|
---|
| 1549 | return rc;
|
---|
| 1550 | if (!fn)
|
---|
| 1551 | return ENOENT;
|
---|
[97bc3ee] | 1552 |
|
---|
[69a60c4] | 1553 | fat_node_t *nodep = FAT_NODE(fn);
|
---|
[97bc3ee] | 1554 |
|
---|
[69a60c4] | 1555 | nodep->dirty = true;
|
---|
| 1556 | rc = fat_node_sync(nodep);
|
---|
[97bc3ee] | 1557 |
|
---|
[69a60c4] | 1558 | fat_node_put(fn);
|
---|
[efcebe1] | 1559 | return rc;
|
---|
[c20aa06] | 1560 | }
|
---|
| 1561 |
|
---|
[efcebe1] | 1562 | vfs_out_ops_t fat_ops = {
|
---|
[d2c8533] | 1563 | .fsprobe = fat_fsprobe,
|
---|
[efcebe1] | 1564 | .mounted = fat_mounted,
|
---|
| 1565 | .unmounted = fat_unmounted,
|
---|
| 1566 | .read = fat_read,
|
---|
| 1567 | .write = fat_write,
|
---|
| 1568 | .truncate = fat_truncate,
|
---|
| 1569 | .close = fat_close,
|
---|
| 1570 | .destroy = fat_destroy,
|
---|
| 1571 | .sync = fat_sync,
|
---|
| 1572 | };
|
---|
| 1573 |
|
---|
[be815bc] | 1574 | /**
|
---|
| 1575 | * @}
|
---|
[c20aa06] | 1576 | */
|
---|