[1] | 1 | /* |
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| 2 | * fat32_access.c - FAT32 access functions implementation |
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| 3 | * |
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| 4 | * Author Ghassan Almaless (2008,2009,2010,2011,2012) |
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| 5 | * Mohamed Lamine Karaoui (2015) |
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| 6 | * Alain Greiner (2016) |
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| 7 | * |
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| 8 | * Copyright (c) UPMC Sorbonne Universites |
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| 9 | * |
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| 10 | * This file is part of ALMOS-MKH. |
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| 11 | * |
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| 12 | * ALMOS-MKH.is free software; you can redistribute it and/or modify it |
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| 13 | * under the terms of the GNU General Public License as published by |
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| 14 | * the Free Software Foundation; version 2.0 of the License. |
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| 15 | * |
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| 16 | * ALMOS-MKH.is distributed in the hope that it will be useful, but |
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 19 | * General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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| 23 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 24 | */ |
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| 25 | |
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| 26 | #include <driver.h> |
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[9] | 27 | #include <chdev.h> |
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[1] | 28 | #include <string.h> |
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| 29 | #include <rwlock.h> |
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| 30 | #include <page.h> |
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| 31 | #include <pmm.h> |
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| 32 | #include <thread.h> |
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| 33 | #include <cluster.h> |
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| 34 | #include <mapper.h> |
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| 35 | #include <vfs.h> |
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| 36 | |
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| 37 | #include <fat32.h> |
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| 38 | #include "fat32-private.h" |
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| 39 | |
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| 40 | #if VFAT_INSTRUMENT |
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| 41 | uint32_t blk_rd_count ; |
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| 42 | uint32_t rd_count ; |
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| 43 | uint32_t wr_count ; |
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| 44 | #endif |
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| 45 | |
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| 46 | RPC_DECLARE(__vfat_cluster_count, RPC_RET(RPC_RET_PTR(int, count)), |
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| 47 | RPC_ARG(RPC_ARG_VAL(struct vfat_context_s*, ctx), |
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| 48 | RPC_ARG_VAL(vfat_cluster_t, cluster_index))) |
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| 49 | { |
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| 50 | int cnt; |
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| 51 | vfat_cluster_t next_cluster_index = 0; |
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| 52 | |
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| 53 | cnt = 0; |
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| 54 | while(next_cluster_index < 0x0FFFFFF8) { |
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| 55 | vfat_query_fat(ctx, cluster_index, &next_cluster_index); |
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| 56 | cluster_index = next_cluster_index; |
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| 57 | cnt++; |
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| 58 | } |
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| 59 | *count = cnt; |
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| 60 | } |
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| 61 | |
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| 62 | int vfat_cluster_count(struct vfat_context_s *ctx, vfat_cluster_t cluster_index) |
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| 63 | { |
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| 64 | int count; |
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| 65 | RCPC(ctx->fat_cid, RPC_PRIO_FS, __vfat_cluster_count, |
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| 66 | RPC_RECV(RPC_RECV_OBJ(count)), |
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| 67 | RPC_SEND(RPC_SEND_OBJ(ctx), |
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| 68 | RPC_SEND_OBJ(cluster_index))); |
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| 69 | return count; |
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| 70 | } |
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| 71 | |
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| 72 | RPC_DECLARE(__vfat_query_fat, RPC_RET(RPC_RET_PTR(error_t, err), |
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| 73 | RPC_RET_PTR(vfat_cluster_t, next_cluster_index)), |
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| 74 | |
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| 75 | RPC_ARG(RPC_ARG_VAL(struct vfat_context_s*, ctx), |
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| 76 | RPC_ARG_VAL(vfat_cluster_t, cluster_index))) |
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| 77 | |
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| 78 | { |
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| 79 | vfat_cluster_t *data; |
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| 80 | vfat_cluster_t cluster_offset; |
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| 81 | struct page_s *page; |
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| 82 | struct mapper_s *mapper; |
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| 83 | uint32_t page_id; |
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| 84 | |
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| 85 | mapper = ctx->mapper; |
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| 86 | |
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| 87 | cluster_offset = ctx->fat_begin_lba * ctx->bytes_per_sector + (cluster_index * 4); |
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| 88 | page_id = cluster_offset >> PMM_PAGE_SHIFT; |
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| 89 | |
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| 90 | vfat_dmsg(1, "%s: TID %x, Query FAT at page_id %d to get next cluster of %u\n", |
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| 91 | __FUNCTION__, CURRENT_THREAD, page_id, cluster_index); |
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| 92 | |
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| 93 | if ((page = mapper_get_page(mapper, page_id, MAPPER_SYNC_OP)) == NULL) |
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| 94 | { |
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| 95 | *err = -1; |
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| 96 | return; |
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| 97 | } |
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| 98 | |
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| 99 | vfat_dmsg(1, "%s: cluster offset %d, offset %d\n", __FUNCTION__, cluster_offset, cluster_offset % PMM_PAGE_SIZE); |
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| 100 | |
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| 101 | data = (vfat_sector_t*) ppm_page2addr(page); |
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| 102 | data = (vfat_sector_t*)((uint8_t*) data + (cluster_offset % PMM_PAGE_SIZE)); |
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| 103 | *next_cluster_index = *data & 0x0FFFFFFF; |
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| 104 | |
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| 105 | vfat_dmsg(1, "%s: next cluster for %u is %u\n", __FUNCTION__, cluster_index, *next_cluster_index); |
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| 106 | *err = 0; |
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| 107 | } |
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| 108 | |
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| 109 | error_t vfat_query_fat(struct vfat_context_s* ctx, |
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| 110 | vfat_cluster_t cluster_index, |
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| 111 | vfat_cluster_t *next_cluster_index) |
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| 112 | { |
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| 113 | error_t err; |
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| 114 | vfat_cluster_t next; |
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| 115 | |
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| 116 | RCPC(ctx->fat_cid, RPC_PRIO_FS, __vfat_query_fat, |
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| 117 | RPC_RECV(RPC_RECV_OBJ(err), RPC_RECV_OBJ(next)), |
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| 118 | RPC_SEND(RPC_SEND_OBJ(ctx), RPC_SEND_OBJ(cluster_index))); |
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| 119 | |
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| 120 | *next_cluster_index = next; |
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| 121 | return err; |
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| 122 | } |
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| 123 | |
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| 124 | |
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| 125 | RPC_DECLARE(__vfat_alloc_fat_entry, RPC_RET(RPC_RET_PTR(error_t, err), RPC_RET_PTR(vfat_cluster_t,new_cluster)), |
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| 126 | RPC_ARG(RPC_ARG_VAL(struct vfat_context_s*, ctx))) |
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| 127 | { |
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| 128 | struct page_s *page; |
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| 129 | struct mapper_s *mapper; |
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| 130 | vfat_sector_t EOF_sector; |
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| 131 | vfat_sector_t last_allocated_sector; |
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| 132 | vfat_sector_t sector; |
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| 133 | uint32_t last_allocated_index; |
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| 134 | uint32_t index; |
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| 135 | uint32_t sectors_per_page; |
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| 136 | uint32_t *buffer; |
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| 137 | uint32_t found; |
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| 138 | uint32_t sector_size; |
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| 139 | uint32_t page_id; |
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| 140 | uint32_t old_page_id; |
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| 141 | |
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| 142 | sector_size = ctx->bytes_per_sector; |
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| 143 | sectors_per_page = PMM_PAGE_SIZE / sector_size; |
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| 144 | EOF_sector = ctx->fat_begin_lba + ctx->fat_blk_count; |
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| 145 | *new_cluster = 0; |
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| 146 | *err = 0; |
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| 147 | found = 0; |
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| 148 | old_page_id = 0xFFFFFFFF; |
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| 149 | mapper = ctx->mapper; |
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| 150 | page = NULL; |
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| 151 | |
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| 152 | rwlock_wrlock(&ctx->lock); |
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| 153 | last_allocated_sector = ctx->last_allocated_sector; |
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| 154 | last_allocated_index = ctx->last_allocated_index; |
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| 155 | vfat_dmsg(2, "%s: Started, last allocated sector %u\n", __FUNCTION__, last_allocated_sector); |
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| 156 | |
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| 157 | for(sector = last_allocated_sector; (sector < EOF_sector) && (!found); sector ++) |
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| 158 | { |
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| 159 | vfat_dmsg(2, "%s: sector %u\n", __FUNCTION__, sector); |
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| 160 | page_id = sector / sectors_per_page; |
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| 161 | |
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| 162 | if (page_id != old_page_id) // Let's not reload the same page everytime |
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| 163 | { |
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| 164 | vfat_dmsg(2, "%s: current page #%d, next page #%d\n", __FUNCTION__, old_page_id, page_id); |
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| 165 | |
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| 166 | page = mapper_get_page(mapper, page_id, MAPPER_SYNC_OP); |
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| 167 | |
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| 168 | if(page == NULL) |
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| 169 | { |
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| 170 | printk(WARNING, "WARNING: alloc_fat: error reading sector %d\n", sector); |
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| 171 | *err = VFS_IO_ERR; |
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| 172 | goto VFAT_ALLOC_CLUSTER_ERROR; |
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| 173 | } |
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| 174 | } |
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| 175 | |
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| 176 | buffer = ppm_page2addr(page); |
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| 177 | buffer = buffer + ((sector % sectors_per_page) * (sector_size / 4)); |
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| 178 | |
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| 179 | for(index = last_allocated_index; index < (sector_size/4); index ++) |
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| 180 | { |
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| 181 | vfat_dmsg(2, "%s: index %d\n", __FUNCTION__, index); |
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| 182 | |
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| 183 | if((buffer[index] & 0x0FFFFFFF) == 0x00000000) |
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| 184 | { |
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| 185 | found = 1; |
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| 186 | |
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| 187 | page_lock(page); |
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| 188 | buffer[index] = 0x0FFFFFF8; |
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| 189 | mapper->m_ops->set_page_dirty(page); |
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| 190 | page_unlock(page); |
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| 191 | |
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| 192 | #if VFAT_INSTRUMENT |
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| 193 | wr_count ++; |
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| 194 | #endif |
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| 195 | vfat_dmsg(1,"%s: page #%d (@%x) is set to delayed write\n", __FUNCTION__, page->index, page); |
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| 196 | |
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| 197 | if(index != ((sector_size/4) - 1)) |
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| 198 | { |
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| 199 | ctx->last_allocated_sector = sector; |
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| 200 | ctx->last_allocated_index = (index + 1) % (sector_size/4); |
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| 201 | } |
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| 202 | else |
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| 203 | { |
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| 204 | last_allocated_sector = sector + 1; |
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| 205 | |
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| 206 | if(last_allocated_sector == EOF_sector) |
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| 207 | { |
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| 208 | ctx->last_allocated_sector = ctx->fat_begin_lba; |
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| 209 | ctx->last_allocated_index = 2; |
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| 210 | } |
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| 211 | else |
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| 212 | { |
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| 213 | ctx->last_allocated_sector = last_allocated_sector; |
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| 214 | ctx->last_allocated_index = (index + 1) % (sector_size/4); |
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| 215 | } |
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| 216 | } |
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| 217 | |
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| 218 | index += (sector - ctx->fat_begin_lba) * (sector_size/4); |
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| 219 | vfat_dmsg(2, "%s: found: cluster %u\n", __FUNCTION__, index); |
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| 220 | *new_cluster = index; |
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| 221 | break; |
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| 222 | } |
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| 223 | } |
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| 224 | |
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| 225 | last_allocated_index = 0; |
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| 226 | old_page_id = page_id; |
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| 227 | } |
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| 228 | |
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| 229 | //if(page) |
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| 230 | // page_refcount_down(page); |
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| 231 | |
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| 232 | VFAT_ALLOC_CLUSTER_ERROR: |
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| 233 | rwlock_unlock(&ctx->lock); |
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| 234 | vfat_dmsg(2, "%s: new_cluster %u, hasError ? %d\n", __FUNCTION__, *new_cluster, *err); |
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| 235 | } |
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| 236 | |
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| 237 | |
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| 238 | error_t vfat_alloc_fat_entry(struct vfat_context_s* ctx, vfat_cluster_t *new_cluster) |
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| 239 | { |
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| 240 | error_t err; |
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| 241 | vfat_cluster_t new; |
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| 242 | |
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| 243 | RCPC(ctx->fat_cid, RPC_PRIO_FS, __vfat_alloc_fat_entry, |
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| 244 | RPC_RECV(RPC_RECV_OBJ(err), |
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| 245 | RPC_RECV_OBJ(new)), |
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| 246 | RPC_SEND(RPC_SEND_OBJ(ctx))); |
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| 247 | |
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| 248 | *new_cluster=new; |
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| 249 | |
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| 250 | return err; |
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| 251 | } |
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| 252 | |
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| 253 | |
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| 254 | RPC_DECLARE(__vfat_extend_cluster, RPC_RET(RPC_RET_PTR(error_t, err), |
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| 255 | RPC_RET_PTR(vfat_cluster_t, next_cluster)), |
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| 256 | RPC_ARG(RPC_ARG_VAL(struct vfat_context_s*, ctx), |
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| 257 | RPC_ARG_VAL(vfat_cluster_t, current_vfat_cluster))) |
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| 258 | { |
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| 259 | struct page_s *page; |
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| 260 | struct mapper_s *mapper; |
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| 261 | vfat_sector_t lba; |
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| 262 | vfat_cluster_t val; |
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| 263 | size_t sector_size; |
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| 264 | uint32_t sectors_per_page; |
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| 265 | uint32_t *buffer; |
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| 266 | |
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| 267 | sector_size = ctx->bytes_per_sector; |
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| 268 | sectors_per_page = PMM_PAGE_SIZE / sector_size; |
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| 269 | mapper = ctx->mapper; |
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| 270 | |
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| 271 | if((*err = vfat_alloc_fat_entry(ctx, next_cluster))) |
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| 272 | return; |
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| 273 | |
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| 274 | if(*next_cluster == 0) |
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| 275 | { |
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| 276 | *err=0; |
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| 277 | } |
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| 278 | |
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| 279 | lba = ctx->fat_begin_lba + ((current_vfat_cluster *4) / sector_size); |
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| 280 | |
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| 281 | page = mapper_get_page(mapper, lba / sectors_per_page, MAPPER_SYNC_OP); |
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| 282 | |
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| 283 | if(page == NULL) goto VFAT_EXTEND_CLUSTER_ERROR; |
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| 284 | |
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| 285 | vfat_dmsg(1, "%s: extending cluster %u\n", __FUNCTION__, current_vfat_cluster); |
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| 286 | |
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| 287 | buffer = (uint32_t*) ppm_page2addr(page); |
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| 288 | buffer += (lba % sectors_per_page) * (sector_size/4); |
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| 289 | |
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| 290 | page_lock(page); |
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| 291 | |
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| 292 | val = buffer[current_vfat_cluster % (sector_size/4)] & 0x0FFFFFFF; |
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| 293 | |
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| 294 | if( val >= 0x0FFFFFF8) |
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| 295 | buffer[current_vfat_cluster % (sector_size/4)] = *next_cluster; |
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| 296 | else |
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| 297 | { |
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| 298 | vfat_dmsg(1,"%s: %u already extended !\n", __FUNCTION__, current_vfat_cluster); |
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| 299 | vfat_dmsg(1,"%s: freeing %u\n", __FUNCTION__, *next_cluster); |
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| 300 | |
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| 301 | page_unlock(page); |
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| 302 | //page_refcount_down(page); |
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| 303 | |
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| 304 | lba = ctx->fat_begin_lba + ((*next_cluster *4) / sector_size); |
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| 305 | |
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| 306 | if((page = mapper_get_page(mapper, lba / sectors_per_page, MAPPER_SYNC_OP)) == NULL) |
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| 307 | goto VFAT_EXTEND_CLUSTER_ERROR; |
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| 308 | |
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| 309 | buffer = (uint32_t*) ppm_page2addr(page); |
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| 310 | buffer += (lba % sectors_per_page) * (sector_size/4); |
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| 311 | page_lock(page); |
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| 312 | buffer[*next_cluster % (sector_size/4)] = 0x00; |
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| 313 | } |
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| 314 | |
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| 315 | #if VFAT_INSTRUMENT |
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| 316 | wr_count ++; |
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| 317 | #endif |
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| 318 | |
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| 319 | mapper->m_ops->set_page_dirty(page); |
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| 320 | |
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| 321 | page_unlock(page); |
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| 322 | vfat_dmsg(1,"%s: page #%d (@%x) is set to delayed write\n", __FUNCTION__, page->index, page); |
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| 323 | |
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| 324 | |
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| 325 | vfat_dmsg(1,"%s: cluster %u's FAT entry is set to %u, FAT's sector %u is set as delayed write\n", |
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| 326 | __FUNCTION__, |
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| 327 | current_vfat_cluster, |
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| 328 | *next_cluster, |
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| 329 | lba); |
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| 330 | |
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| 331 | vfat_dmsg(1,"%s: allocated cluster %u for asked cluster %u\n", |
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| 332 | __FUNCTION__, |
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| 333 | *next_cluster, |
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| 334 | current_vfat_cluster); |
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| 335 | *err = 0; |
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| 336 | return; |
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| 337 | |
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| 338 | VFAT_EXTEND_CLUSTER_ERROR: |
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| 339 | vfat_free_fat_entry(ctx,*next_cluster); |
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| 340 | *next_cluster = 0; |
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| 341 | *err = -1; |
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| 342 | } |
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| 343 | |
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| 344 | error_t vfat_extend_cluster(struct vfat_context_s* ctx, |
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| 345 | vfat_cluster_t current_vfat_cluster, |
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| 346 | vfat_cluster_t *next_cluster) |
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| 347 | { |
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| 348 | error_t err; |
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| 349 | vfat_cluster_t next; |
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| 350 | |
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| 351 | RCPC(ctx->fat_cid, RPC_PRIO_FS, __vfat_extend_cluster, |
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| 352 | RPC_RECV(RPC_RECV_OBJ(err), |
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| 353 | RPC_RECV_OBJ(next)), |
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| 354 | RPC_SEND(RPC_SEND_OBJ(ctx), |
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| 355 | RPC_SEND_OBJ(current_vfat_cluster))); |
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| 356 | |
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| 357 | *next_cluster=next; |
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| 358 | |
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| 359 | return err; |
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| 360 | } |
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| 361 | |
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| 362 | |
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| 363 | RPC_DECLARE(__vfat_free_fat_entry, RPC_RET(RPC_RET_PTR(error_t, err)), |
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| 364 | RPC_ARG(RPC_ARG_VAL(struct vfat_context_s*, ctx), |
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| 365 | RPC_ARG_VAL(vfat_cluster_t, start_cluster))) |
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| 366 | { |
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| 367 | struct page_s *page; |
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| 368 | struct mapper_s *mapper; |
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| 369 | vfat_sector_t *sector; |
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| 370 | vfat_cluster_t current_index; |
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| 371 | vfat_cluster_t next_index; |
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| 372 | vfat_sector_t lba; |
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| 373 | size_t sector_size; |
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| 374 | uint32_t sectors_per_page; |
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| 375 | |
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| 376 | sector_size = ctx->bytes_per_sector; |
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| 377 | sectors_per_page = PMM_PAGE_SIZE / sector_size; |
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| 378 | current_index = start_cluster; |
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| 379 | mapper = ctx->mapper; |
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| 380 | |
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| 381 | vfat_dmsg(1,"%s: freeling fat entries starting by %u\n", __FUNCTION__, start_cluster); |
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| 382 | |
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| 383 | while((current_index > 0) && (current_index < 0x0FFFFFF7)) |
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| 384 | { |
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| 385 | lba = ctx->fat_begin_lba + ((current_index *4) / sector_size); |
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| 386 | |
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| 387 | vfat_dmsg(1,"%s: query FAT at %d lba to get next cluster index of %u\n", |
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| 388 | __FUNCTION__, lba, current_index); |
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| 389 | |
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| 390 | page = mapper_get_page(mapper, lba / sectors_per_page, MAPPER_SYNC_OP); |
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| 391 | |
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| 392 | if(page == NULL) |
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| 393 | { |
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| 394 | *err= VFS_IO_ERR; |
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| 395 | return; |
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| 396 | } |
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| 397 | |
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| 398 | sector = (vfat_sector_t*) ppm_page2addr(page); |
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| 399 | sector += (lba%sectors_per_page) * (sector_size/4); |
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| 400 | |
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| 401 | page_lock(page); |
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| 402 | next_index = sector[current_index % (sector_size/4)] & 0x0FFFFFFF; |
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| 403 | sector[current_index % (sector_size/4)] = 0x00; |
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| 404 | mapper->m_ops->set_page_dirty(page); |
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| 405 | page_unlock(page); |
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| 406 | vfat_dmsg(1,"%s: page #%d (@%x) is set to delayed write\n", __FUNCTION__, page->index, page); |
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| 407 | //page_refcount_down(page); |
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| 408 | |
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| 409 | #if VFAT_INSTRUMENT |
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| 410 | wr_count ++; |
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| 411 | #endif |
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| 412 | |
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| 413 | vfat_dmsg(1,"%s: content of %d is set to 0, next cluster in the list is %d\n", |
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| 414 | __FUNCTION__, current_index, next_index); |
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| 415 | current_index = next_index; |
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| 416 | } |
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| 417 | *err = 0; |
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| 418 | } |
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| 419 | |
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| 420 | |
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| 421 | error_t vfat_free_fat_entry(struct vfat_context_s* ctx, vfat_cluster_t start_cluster) |
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| 422 | { |
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| 423 | error_t err; |
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| 424 | RCPC(ctx->fat_cid, RPC_PRIO_FS, __vfat_free_fat_entry, |
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| 425 | RPC_RECV(RPC_RECV_OBJ(err)), |
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| 426 | RPC_SEND(RPC_SEND_OBJ(ctx), |
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| 427 | RPC_SEND_OBJ(start_cluster))); |
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| 428 | return err; |
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| 429 | } |
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| 430 | |
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| 431 | //RPC_DECLARE(__vfat_locate_entry, RPC_RET(RPC_RET_PTR(error_t, err), RPC_RET_PTR(uint_t, entry_index)), |
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| 432 | // RPC_ARG(RPC_ARG_PTR(char, entry_name), RPC_ARG_PTR(struct vfat_entry_request_s, rq))) |
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| 433 | error_t vfat_locate_entry(struct vfat_entry_request_s *rq) |
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| 434 | { |
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| 435 | struct vfat_context_s *ctx; |
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| 436 | struct vfat_DirEntry_s *dir; |
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| 437 | struct page_s *page; |
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| 438 | struct mapper_s *mapper; |
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| 439 | struct vfs_inode_s *parent; |
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| 440 | struct vfat_inode_s *parent_info; |
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| 441 | uint_t entries_nr; |
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| 442 | uint_t entry; |
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| 443 | uint_t entry_id; |
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| 444 | uint_t current_page; |
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| 445 | size_t current_offset; |
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| 446 | char name[VFS_MAX_NAME_LENGTH + 1]; /* +1 for string null termination */ |
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| 447 | uint32_t found; |
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| 448 | |
---|
| 449 | ctx = rq->ctx; |
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| 450 | dir = NULL; |
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| 451 | page = NULL; |
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| 452 | parent = rq->parent; |
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| 453 | mapper = parent->i_mapper; |
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| 454 | parent_info = parent->i_pv; |
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| 455 | entries_nr = PMM_PAGE_SIZE / sizeof(struct vfat_DirEntry_s); |
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| 456 | current_page = 0; |
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| 457 | current_offset = 0; |
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| 458 | found = 0; |
---|
| 459 | entry_id = 0; |
---|
| 460 | |
---|
| 461 | vfat_dmsg(1,"%s: started, node %s\n", __FUNCTION__, rq->entry_name); |
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| 462 | |
---|
| 463 | while(!found) |
---|
| 464 | { |
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| 465 | page = mapper_get_page(mapper, current_page, MAPPER_SYNC_OP); |
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| 466 | |
---|
| 467 | if(page == NULL){ return VFS_IO_ERR;} |
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| 468 | |
---|
| 469 | page_lock(page); |
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| 470 | |
---|
| 471 | dir = (struct vfat_DirEntry_s*) ppm_page2addr(page); |
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| 472 | |
---|
| 473 | for(entry=0; entry < entries_nr; entry ++) |
---|
| 474 | { |
---|
| 475 | if(dir[entry].DIR_Name[0] == 0x00) |
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| 476 | { |
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| 477 | //page_refcount_down(page); |
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| 478 | page_unlock(page); |
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| 479 | return VFS_NOT_FOUND; |
---|
| 480 | } |
---|
| 481 | |
---|
| 482 | if(dir[entry].DIR_Name[0] == 0xE5) |
---|
| 483 | continue; |
---|
| 484 | |
---|
| 485 | if(dir[entry].DIR_Name[0] == '.') |
---|
| 486 | continue; |
---|
| 487 | |
---|
| 488 | if(rq->entry_name == NULL) |
---|
| 489 | { |
---|
| 490 | page_unlock(page); |
---|
| 491 | return VFS_ENOTEMPTY; |
---|
| 492 | } |
---|
| 493 | |
---|
| 494 | if(dir[entry].DIR_Attr == 0x0F) |
---|
| 495 | continue; |
---|
| 496 | |
---|
| 497 | vfat_getshortname((char *)dir[entry].DIR_Name, name); |
---|
| 498 | |
---|
| 499 | if(!strcmp(name,rq->entry_name)) |
---|
| 500 | { |
---|
| 501 | found = 1; |
---|
| 502 | |
---|
| 503 | if (rq->entry != NULL) |
---|
| 504 | memcpy(rq->entry, &dir[entry], sizeof(*dir)); |
---|
| 505 | |
---|
| 506 | vfat_dmsg(1, "%s: entries_nr %d, entry_id %d, entry %d\n", |
---|
| 507 | __FUNCTION__, |
---|
| 508 | entries_nr, |
---|
| 509 | entry_id, |
---|
| 510 | entry); |
---|
| 511 | |
---|
| 512 | *rq->entry_index = (entry_id * entries_nr) + entry; |
---|
| 513 | break; |
---|
| 514 | } |
---|
| 515 | |
---|
| 516 | current_offset += sizeof (struct vfat_DirEntry_s); |
---|
| 517 | } |
---|
| 518 | |
---|
| 519 | entry_id++; |
---|
| 520 | current_page++; |
---|
| 521 | page_unlock(page); |
---|
| 522 | } |
---|
| 523 | |
---|
| 524 | vfat_dmsg(1,"%s: found %d, entry_index %d\n", __FUNCTION__, found, *rq->entry_index); |
---|
| 525 | |
---|
| 526 | return (found) ? VFS_FOUND : VFS_NOT_FOUND; |
---|
| 527 | } |
---|
| 528 | |
---|
| 529 | |
---|
| 530 | RPC_DECLARE(__vfat_cluster_lookup, RPC_RET(RPC_RET_PTR(error_t, err), |
---|
| 531 | RPC_RET_PTR(vfat_cluster_t, cluster_index), |
---|
| 532 | RPC_RET_PTR(uint_t, extended)), |
---|
| 533 | |
---|
| 534 | RPC_ARG(RPC_ARG_VAL(struct vfat_context_s*, ctx), |
---|
| 535 | RPC_ARG_VAL(vfat_cluster_t, node_cluster), |
---|
| 536 | RPC_ARG_VAL(vfat_cluster_t, cluster_rank))) |
---|
| 537 | |
---|
| 538 | { |
---|
| 539 | struct page_s* page; |
---|
| 540 | struct mapper_s* mapper; |
---|
| 541 | register vfat_cluster_t i, current_vfat_cluster; |
---|
| 542 | vfat_cluster_t next_cluster; |
---|
| 543 | vfat_cluster_t cluster_offset, old_cluster_offset; |
---|
| 544 | vfat_sector_t *sector; |
---|
| 545 | uint32_t sectors_per_page; |
---|
| 546 | uint32_t old_page_id, page_id; |
---|
| 547 | |
---|
| 548 | sectors_per_page = PMM_PAGE_SIZE / ctx->bytes_per_cluster; |
---|
| 549 | *extended = 0; |
---|
| 550 | current_vfat_cluster = node_cluster; |
---|
| 551 | next_cluster = 0; |
---|
| 552 | |
---|
| 553 | old_cluster_offset = ctx->fat_begin_lba*(ctx->bytes_per_sector/4) + current_vfat_cluster; |
---|
| 554 | old_page_id = old_cluster_offset / (PMM_PAGE_SIZE/4); |
---|
| 555 | |
---|
| 556 | mapper = ctx->mapper; |
---|
| 557 | page = mapper_get_page(mapper, old_page_id, MAPPER_SYNC_OP); |
---|
| 558 | |
---|
| 559 | if(page == NULL) {*err = VFS_IO_ERR; return;} |
---|
| 560 | |
---|
| 561 | sector = (vfat_sector_t*) ppm_page2addr(page); |
---|
| 562 | |
---|
| 563 | vfat_dmsg(1,"%s: started, first cluster %u, cluster rank %d\n",__FUNCTION__, node_cluster, cluster_rank); |
---|
| 564 | |
---|
| 565 | for(i=0; i < cluster_rank; i++) |
---|
| 566 | { |
---|
| 567 | vfat_dmsg(5,"%s: loop %d/%d\n",__FUNCTION__,i+1,cluster_rank); |
---|
| 568 | next_cluster = sector[old_cluster_offset % (PMM_PAGE_SIZE/4)] & 0x0FFFFFFF; |
---|
| 569 | vfat_dmsg(5,"%s: next cluster found %u\n",__FUNCTION__, next_cluster); |
---|
| 570 | |
---|
| 571 | if(next_cluster == 0x0FFFFFF7) // bad block |
---|
| 572 | {*err = VFS_EBADBLK; return;} |
---|
| 573 | |
---|
| 574 | if(next_cluster >= 0x0FFFFFF8) |
---|
| 575 | { |
---|
| 576 | if(vfat_extend_cluster(ctx, current_vfat_cluster, &next_cluster)) |
---|
| 577 | // error while trying to extend |
---|
| 578 | {*err = VFS_IO_ERR; return;} |
---|
| 579 | |
---|
| 580 | if(next_cluster == 0) |
---|
| 581 | // no more space for another cluster |
---|
| 582 | {*err = VFS_ENOSPC; return;} |
---|
| 583 | |
---|
| 584 | *extended = 1; |
---|
| 585 | } |
---|
| 586 | |
---|
| 587 | current_vfat_cluster = next_cluster; |
---|
| 588 | cluster_offset = ctx->fat_begin_lba * (ctx->bytes_per_sector/4) + current_vfat_cluster; |
---|
| 589 | page_id = cluster_offset / (PMM_PAGE_SIZE/4); |
---|
| 590 | |
---|
| 591 | if(page_id != old_page_id) |
---|
| 592 | { |
---|
| 593 | //page_refcount_down(page); |
---|
| 594 | |
---|
| 595 | page = mapper_get_page(mapper, page_id, MAPPER_SYNC_OP); |
---|
| 596 | |
---|
| 597 | if(page == NULL) {*err = VFS_IO_ERR; return;} |
---|
| 598 | |
---|
| 599 | sector = (vfat_sector_t*) ppm_page2addr(page); |
---|
| 600 | |
---|
| 601 | vfat_dmsg(3, "%s: loading page %d for cluster %u\n", __FUNCTION__, page_id, next_cluster); |
---|
| 602 | old_page_id = page_id; |
---|
| 603 | } |
---|
| 604 | |
---|
| 605 | old_cluster_offset = cluster_offset; |
---|
| 606 | } |
---|
| 607 | |
---|
| 608 | vfat_dmsg(1, "%s: cluster found: %u\n", __FUNCTION__, current_vfat_cluster); |
---|
| 609 | //page_refcount_down(page); |
---|
| 610 | *cluster_index = current_vfat_cluster; |
---|
| 611 | *err = 0; |
---|
| 612 | } |
---|
| 613 | |
---|
| 614 | error_t vfat_cluster_lookup(struct vfat_context_s* ctx, |
---|
| 615 | vfat_cluster_t node_cluster, |
---|
| 616 | vfat_cluster_t cluster_rank, |
---|
| 617 | vfat_cluster_t *cluster_index, |
---|
| 618 | uint_t *extended) |
---|
| 619 | { |
---|
| 620 | error_t err; |
---|
| 621 | vfat_cluster_t index; |
---|
| 622 | uint_t extd; |
---|
| 623 | |
---|
| 624 | RCPC(ctx->fat_cid, RPC_PRIO_FS, __vfat_cluster_lookup, |
---|
| 625 | RPC_RECV(RPC_RECV_OBJ(err), |
---|
| 626 | RPC_RECV_OBJ(index), |
---|
| 627 | RPC_RECV_OBJ(extd)), |
---|
| 628 | |
---|
| 629 | RPC_SEND(RPC_SEND_OBJ(ctx), |
---|
| 630 | RPC_SEND_OBJ(node_cluster), |
---|
| 631 | RPC_SEND_OBJ(cluster_rank))); |
---|
| 632 | *extended = extd; |
---|
| 633 | *cluster_index = index; |
---|
| 634 | return err; |
---|
| 635 | } |
---|