| [be815bc] | 1 | /*
|
|---|
| [5e790e6] | 2 | * Copyright (c) 2008 Jakub Jermar
|
|---|
| [be815bc] | 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup fs
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 |
|
|---|
| 33 | #ifndef FAT_FAT_H_
|
|---|
| 34 | #define FAT_FAT_H_
|
|---|
| 35 |
|
|---|
| [0f57d0e] | 36 | #include "fat_fat.h"
|
|---|
| [be815bc] | 37 | #include <ipc/ipc.h>
|
|---|
| [6ebe721] | 38 | #include <fibril_sync.h>
|
|---|
| [efd4a72] | 39 | #include <libfs.h>
|
|---|
| [be815bc] | 40 | #include <atomic.h>
|
|---|
| 41 | #include <sys/types.h>
|
|---|
| 42 | #include <bool.h>
|
|---|
| [5e790e6] | 43 | #include "../../vfs/vfs.h"
|
|---|
| [be815bc] | 44 |
|
|---|
| [b7b6753] | 45 | #ifndef dprintf
|
|---|
| [be815bc] | 46 | #define dprintf(...) printf(__VA_ARGS__)
|
|---|
| [b7b6753] | 47 | #endif
|
|---|
| [be815bc] | 48 |
|
|---|
| [0f57d0e] | 49 | #define min(a, b) ((a) < (b) ? (a) : (b))
|
|---|
| 50 |
|
|---|
| 51 | #define BS_BLOCK 0
|
|---|
| 52 | #define BS_SIZE 512
|
|---|
| 53 |
|
|---|
| [cb682eb] | 54 | typedef struct fat_bs {
|
|---|
| [5af627fc] | 55 | uint8_t ji[3]; /**< Jump instruction. */
|
|---|
| 56 | uint8_t oem_name[8];
|
|---|
| 57 | /* BIOS Parameter Block */
|
|---|
| 58 | uint16_t bps; /**< Bytes per sector. */
|
|---|
| 59 | uint8_t spc; /**< Sectors per cluster. */
|
|---|
| [5e790e6] | 60 | uint16_t rscnt; /**< Reserved sector count. */
|
|---|
| [5af627fc] | 61 | uint8_t fatcnt; /**< Number of FATs. */
|
|---|
| 62 | uint16_t root_ent_max; /**< Maximum number of root directory
|
|---|
| 63 | entries. */
|
|---|
| [5e790e6] | 64 | uint16_t totsec16; /**< Total sectors. 16-bit version. */
|
|---|
| [5af627fc] | 65 | uint8_t mdesc; /**< Media descriptor. */
|
|---|
| 66 | uint16_t sec_per_fat; /**< Sectors per FAT12/FAT16. */
|
|---|
| 67 | uint16_t sec_per_track; /**< Sectors per track. */
|
|---|
| 68 | uint16_t headcnt; /**< Number of heads. */
|
|---|
| 69 | uint32_t hidden_sec; /**< Hidden sectors. */
|
|---|
| [e1e3b26] | 70 | uint32_t totsec32; /**< Total sectors. 32-bit version. */
|
|---|
| [5af627fc] | 71 |
|
|---|
| 72 | union {
|
|---|
| 73 | struct {
|
|---|
| 74 | /* FAT12/FAT16 only: Extended BIOS Parameter Block */
|
|---|
| 75 | /** Physical drive number. */
|
|---|
| 76 | uint8_t pdn;
|
|---|
| 77 | uint8_t reserved;
|
|---|
| 78 | /** Extended boot signature. */
|
|---|
| 79 | uint8_t ebs;
|
|---|
| 80 | /** Serial number. */
|
|---|
| 81 | uint32_t id;
|
|---|
| 82 | /** Volume label. */
|
|---|
| 83 | uint8_t label[11];
|
|---|
| 84 | /** FAT type. */
|
|---|
| 85 | uint8_t type[8];
|
|---|
| 86 | /** Boot code. */
|
|---|
| 87 | uint8_t boot_code[448];
|
|---|
| 88 | /** Boot sector signature. */
|
|---|
| 89 | uint16_t signature;
|
|---|
| 90 | } __attribute__ ((packed));
|
|---|
| [f563126] | 91 | struct fat32 {
|
|---|
| [5af627fc] | 92 | /* FAT32 only */
|
|---|
| 93 | /** Sectors per FAT. */
|
|---|
| 94 | uint32_t sectors_per_fat;
|
|---|
| 95 | /** FAT flags. */
|
|---|
| 96 | uint16_t flags;
|
|---|
| 97 | /** Version. */
|
|---|
| 98 | uint16_t version;
|
|---|
| 99 | /** Cluster number of root directory. */
|
|---|
| 100 | uint32_t root_cluster;
|
|---|
| 101 | /** Sector number of file system information sector. */
|
|---|
| 102 | uint16_t fsinfo_sec;
|
|---|
| 103 | /** Sector number of boot sector copy. */
|
|---|
| 104 | uint16_t bscopy_sec;
|
|---|
| 105 | uint8_t reserved1[12];
|
|---|
| 106 | /** Physical drive number. */
|
|---|
| 107 | uint8_t pdn;
|
|---|
| 108 | uint8_t reserved2;
|
|---|
| 109 | /** Extended boot signature. */
|
|---|
| 110 | uint8_t ebs;
|
|---|
| 111 | /** Serial number. */
|
|---|
| 112 | uint32_t id;
|
|---|
| 113 | /** Volume label. */
|
|---|
| [5e790e6] | 114 | uint8_t label[11];
|
|---|
| [5af627fc] | 115 | /** FAT type. */
|
|---|
| 116 | uint8_t type[8];
|
|---|
| 117 | /** Boot code. */
|
|---|
| 118 | uint8_t boot_code[420];
|
|---|
| 119 | /** Signature. */
|
|---|
| 120 | uint16_t signature;
|
|---|
| 121 | } __attribute__ ((packed));
|
|---|
| 122 | };
|
|---|
| [263e1ec] | 123 | } __attribute__ ((packed)) fat_bs_t;
|
|---|
| 124 |
|
|---|
| [5e790e6] | 125 | typedef enum {
|
|---|
| [e1e3b26] | 126 | FAT_INVALID,
|
|---|
| [5e790e6] | 127 | FAT_DIRECTORY,
|
|---|
| 128 | FAT_FILE
|
|---|
| 129 | } fat_node_type_t;
|
|---|
| 130 |
|
|---|
| [869e546] | 131 | struct fat_node;
|
|---|
| 132 |
|
|---|
| 133 | /** FAT index structure.
|
|---|
| 134 | *
|
|---|
| 135 | * This structure exists to help us to overcome certain limitations of the FAT
|
|---|
| 136 | * file system design. The problem with FAT is that it is hard to find
|
|---|
| 137 | * an entity which could represent a VFS index. There are two candidates:
|
|---|
| 138 | *
|
|---|
| 139 | * a) number of the node's first cluster
|
|---|
| 140 | * b) the pair of the parent directory's first cluster and the dentry index
|
|---|
| 141 | * within the parent directory
|
|---|
| 142 | *
|
|---|
| 143 | * We need VFS indices to be:
|
|---|
| 144 | * A) unique
|
|---|
| 145 | * B) stable in time, at least until the next mount
|
|---|
| 146 | *
|
|---|
| 147 | * Unfortunately a) does not meet the A) criterion because zero-length files
|
|---|
| 148 | * will have the first cluster field cleared. And b) does not meet the B)
|
|---|
| 149 | * criterion because unlink() and rename() will both free up the original
|
|---|
| 150 | * dentry, which contains all the essential info about the file.
|
|---|
| 151 | *
|
|---|
| 152 | * Therefore, a completely opaque indices are used and the FAT server maintains
|
|---|
| 153 | * a mapping between them and otherwise nice b) variant. On rename(), the VFS
|
|---|
| 154 | * index stays unaltered, while the internal FAT "physical tree address"
|
|---|
| 155 | * changes. The unlink case is also handled this way thanks to an in-core node
|
|---|
| 156 | * pointer embedded in the index structure.
|
|---|
| 157 | */
|
|---|
| [5e790e6] | 158 | typedef struct {
|
|---|
| [4797132] | 159 | /** Used indices (position) hash table link. */
|
|---|
| 160 | link_t uph_link;
|
|---|
| 161 | /** Used indices (index) hash table link. */
|
|---|
| 162 | link_t uih_link;
|
|---|
| [9a5ccfb3] | 163 |
|
|---|
| [6ebe721] | 164 | fibril_mutex_t lock;
|
|---|
| [869e546] | 165 | dev_handle_t dev_handle;
|
|---|
| 166 | fs_index_t index;
|
|---|
| 167 | /**
|
|---|
| [9a5ccfb3] | 168 | * Parent node's first cluster.
|
|---|
| [869e546] | 169 | * Zero is used if this node is not linked, in which case nodep must
|
|---|
| 170 | * contain a pointer to the in-core node structure.
|
|---|
| 171 | * One is used when the parent is the root directory.
|
|---|
| 172 | */
|
|---|
| 173 | fat_cluster_t pfc;
|
|---|
| [9a5ccfb3] | 174 | /** Directory entry index within the parent node. */
|
|---|
| [869e546] | 175 | unsigned pdi;
|
|---|
| 176 | /** Pointer to in-core node instance. */
|
|---|
| 177 | struct fat_node *nodep;
|
|---|
| 178 | } fat_idx_t;
|
|---|
| 179 |
|
|---|
| 180 | /** FAT in-core node. */
|
|---|
| 181 | typedef struct fat_node {
|
|---|
| [b6035ba] | 182 | /** Back pointer to the FS node. */
|
|---|
| 183 | fs_node_t *bp;
|
|---|
| 184 |
|
|---|
| [6ebe721] | 185 | fibril_mutex_t lock;
|
|---|
| [5e790e6] | 186 | fat_node_type_t type;
|
|---|
| [869e546] | 187 | fat_idx_t *idx;
|
|---|
| 188 | /**
|
|---|
| 189 | * Node's first cluster.
|
|---|
| 190 | * Zero is used for zero-length nodes.
|
|---|
| 191 | * One is used to mark root directory.
|
|---|
| 192 | */
|
|---|
| 193 | fat_cluster_t firstc;
|
|---|
| [e1e3b26] | 194 | /** FAT in-core node free list link. */
|
|---|
| 195 | link_t ffn_link;
|
|---|
| [5e790e6] | 196 | size_t size;
|
|---|
| 197 | unsigned lnkcnt;
|
|---|
| [e1e3b26] | 198 | unsigned refcnt;
|
|---|
| 199 | bool dirty;
|
|---|
| [5e790e6] | 200 | } fat_node_t;
|
|---|
| 201 |
|
|---|
| [efd4a72] | 202 | extern fs_reg_t fat_reg;
|
|---|
| [be815bc] | 203 |
|
|---|
| [cde485d] | 204 | extern void fat_mounted(ipc_callid_t, ipc_call_t *);
|
|---|
| 205 | extern void fat_mount(ipc_callid_t, ipc_call_t *);
|
|---|
| [6364d3c] | 206 | extern void fat_lookup(ipc_callid_t, ipc_call_t *);
|
|---|
| [4bf40f6] | 207 | extern void fat_read(ipc_callid_t, ipc_call_t *);
|
|---|
| [c947dda] | 208 | extern void fat_write(ipc_callid_t, ipc_call_t *);
|
|---|
| [6c71a1f] | 209 | extern void fat_truncate(ipc_callid_t, ipc_call_t *);
|
|---|
| [852b801] | 210 | extern void fat_stat(ipc_callid_t, ipc_call_t *);
|
|---|
| [c20aa06] | 211 | extern void fat_close(ipc_callid_t, ipc_call_t *);
|
|---|
| [50e5b25] | 212 | extern void fat_destroy(ipc_callid_t, ipc_call_t *);
|
|---|
| [c20aa06] | 213 | extern void fat_open_node(ipc_callid_t, ipc_call_t *);
|
|---|
| [852b801] | 214 | extern void fat_stat(ipc_callid_t, ipc_call_t *);
|
|---|
| [c20aa06] | 215 | extern void fat_sync(ipc_callid_t, ipc_call_t *);
|
|---|
| [6364d3c] | 216 |
|
|---|
| [9a15176] | 217 | extern int fat_idx_get_new(fat_idx_t **, dev_handle_t);
|
|---|
| [4797132] | 218 | extern fat_idx_t *fat_idx_get_by_pos(dev_handle_t, fat_cluster_t, unsigned);
|
|---|
| 219 | extern fat_idx_t *fat_idx_get_by_index(dev_handle_t, fs_index_t);
|
|---|
| [48eb7a14] | 220 | extern void fat_idx_destroy(fat_idx_t *);
|
|---|
| [0fdd6bb] | 221 | extern void fat_idx_hashin(fat_idx_t *);
|
|---|
| [a31c1ccf] | 222 | extern void fat_idx_hashout(fat_idx_t *);
|
|---|
| [297f1197] | 223 |
|
|---|
| [cde485d] | 224 | extern int fat_idx_init(void);
|
|---|
| 225 | extern void fat_idx_fini(void);
|
|---|
| 226 | extern int fat_idx_init_by_dev_handle(dev_handle_t);
|
|---|
| 227 | extern void fat_idx_fini_by_dev_handle(dev_handle_t);
|
|---|
| 228 |
|
|---|
| [be815bc] | 229 | #endif
|
|---|
| 230 |
|
|---|
| 231 | /**
|
|---|
| 232 | * @}
|
|---|
| 233 | */
|
|---|
