| /branches/network/uspace/srv/fs/fat/fat.c |
|---|
| 0,0 → 1,146 |
| /* |
| * Copyright (c) 2006 Martin Decky |
| * Copyright (c) 2008 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| /** @addtogroup fs |
| * @{ |
| */ |
| /** |
| * @file fat.c |
| * @brief FAT file system driver for HelenOS. |
| */ |
| #include "fat.h" |
| #include <ipc/ipc.h> |
| #include <ipc/services.h> |
| #include <async.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <libfs.h> |
| #include "../../vfs/vfs.h" |
| vfs_info_t fat_vfs_info = { |
| .name = "fat", |
| .ops = { |
| [IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED, |
| [IPC_METHOD_TO_VFS_OP(VFS_OPEN)] = VFS_OP_DEFINED, |
| [IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] = VFS_OP_DEFINED, |
| [IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED, |
| [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_TRUNCATE)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_RENAME)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_OPENDIR)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_READDIR)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_CLOSEDIR)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_UNLINK)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_NULL, |
| [IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_NULL, |
| } |
| }; |
| fs_reg_t fat_reg; |
| /** |
| * This connection fibril processes VFS requests from VFS. |
| * |
| * In order to support simultaneous VFS requests, our design is as follows. |
| * The connection fibril accepts VFS requests from VFS. If there is only one |
| * instance of the fibril, VFS will need to serialize all VFS requests it sends |
| * to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO |
| * call. In that case, a new connection fibril will be created, which in turn |
| * will accept the call. Thus, a new phone will be opened for VFS. |
| * |
| * There are few issues with this arrangement. First, VFS can run out of |
| * available phones. In that case, VFS can close some other phones or use one |
| * phone for more serialized requests. Similarily, FAT can refuse to duplicate |
| * the connection. VFS should then just make use of already existing phones and |
| * route its requests through them. To avoid paying the fibril creation price |
| * upon each request, FAT might want to keep the connections open after the |
| * request has been completed. |
| */ |
| static void fat_connection(ipc_callid_t iid, ipc_call_t *icall) |
| { |
| if (iid) { |
| /* |
| * This only happens for connections opened by |
| * IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
| * created by IPC_M_CONNECT_TO_ME. |
| */ |
| ipc_answer_0(iid, EOK); |
| } |
| dprintf("VFS-FAT connection established.\n"); |
| while (1) { |
| ipc_callid_t callid; |
| ipc_call_t call; |
| callid = async_get_call(&call); |
| switch (IPC_GET_METHOD(call)) { |
| case VFS_LOOKUP: |
| fat_lookup(callid, &call); |
| break; |
| default: |
| ipc_answer_0(callid, ENOTSUP); |
| break; |
| } |
| } |
| } |
| int main(int argc, char **argv) |
| { |
| int vfs_phone; |
| printf("FAT: HelenOS FAT file system server.\n"); |
| vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
| while (vfs_phone < EOK) { |
| usleep(10000); |
| vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
| } |
| int rc; |
| rc = fs_register(vfs_phone, &fat_reg, &fat_vfs_info, fat_connection); |
| if (rc != EOK) { |
| printf("Failed to register the FAT file system (%d)\n", rc); |
| return rc; |
| } |
| dprintf("FAT filesystem registered, fs_handle=%d.\n", |
| fat_reg.fs_handle); |
| async_manager(); |
| /* not reached */ |
| return 0; |
| } |
| /** |
| * @} |
| */ |
| /branches/network/uspace/srv/fs/fat/fat.h |
|---|
| 0,0 → 1,145 |
| /* |
| * Copyright (c) 2007 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| /** @addtogroup fs |
| * @{ |
| */ |
| #ifndef FAT_FAT_H_ |
| #define FAT_FAT_H_ |
| #include <ipc/ipc.h> |
| #include <libfs.h> |
| #include <atomic.h> |
| #include <sys/types.h> |
| #include <bool.h> |
| #define dprintf(...) printf(__VA_ARGS__) |
| typedef struct { |
| uint8_t ji[3]; /**< Jump instruction. */ |
| uint8_t oem_name[8]; |
| /* BIOS Parameter Block */ |
| uint16_t bps; /**< Bytes per sector. */ |
| uint8_t spc; /**< Sectors per cluster. */ |
| uint16_t rsc; /**< Reserved sector count. */ |
| uint8_t fatcnt; /**< Number of FATs. */ |
| uint16_t root_ent_max; /**< Maximum number of root directory |
| entries. */ |
| uint16_t totsec; /**< Total sectors. */ |
| uint8_t mdesc; /**< Media descriptor. */ |
| uint16_t sec_per_fat; /**< Sectors per FAT12/FAT16. */ |
| uint16_t sec_per_track; /**< Sectors per track. */ |
| uint16_t headcnt; /**< Number of heads. */ |
| uint32_t hidden_sec; /**< Hidden sectors. */ |
| uint32_t total_sec; /**< Total sectors. */ |
| union { |
| struct { |
| /* FAT12/FAT16 only: Extended BIOS Parameter Block */ |
| /** Physical drive number. */ |
| uint8_t pdn; |
| uint8_t reserved; |
| /** Extended boot signature. */ |
| uint8_t ebs; |
| /** Serial number. */ |
| uint32_t id; |
| /** Volume label. */ |
| uint8_t label[11]; |
| /** FAT type. */ |
| uint8_t type[8]; |
| /** Boot code. */ |
| uint8_t boot_code[448]; |
| /** Boot sector signature. */ |
| uint16_t signature; |
| } __attribute__ ((packed)); |
| struct { |
| /* FAT32 only */ |
| /** Sectors per FAT. */ |
| uint32_t sectors_per_fat; |
| /** FAT flags. */ |
| uint16_t flags; |
| /** Version. */ |
| uint16_t version; |
| /** Cluster number of root directory. */ |
| uint32_t root_cluster; |
| /** Sector number of file system information sector. */ |
| uint16_t fsinfo_sec; |
| /** Sector number of boot sector copy. */ |
| uint16_t bscopy_sec; |
| uint8_t reserved1[12]; |
| /** Physical drive number. */ |
| uint8_t pdn; |
| uint8_t reserved2; |
| /** Extended boot signature. */ |
| uint8_t ebs; |
| /** Serial number. */ |
| uint32_t id; |
| /** Volume label. */ |
| uint8_t label; |
| /** FAT type. */ |
| uint8_t type[8]; |
| /** Boot code. */ |
| uint8_t boot_code[420]; |
| /** Signature. */ |
| uint16_t signature; |
| } __attribute__ ((packed)); |
| }; |
| } __attribute__ ((packed)) fat_bs_t; |
| typedef struct { |
| uint8_t name[8]; |
| uint8_t ext[3]; |
| uint8_t attr; |
| uint8_t reserved; |
| uint8_t ctime_fine; |
| uint16_t ctime; |
| uint16_t cdate; |
| uint16_t adate; |
| union { |
| uint16_t eaidx; /* FAT12/FAT16 */ |
| uint16_t firstc_hi; /* FAT32 */ |
| }; |
| uint16_t mtime; |
| uint16_t mdate; |
| union { |
| uint16_t firstc; /* FAT12/FAT16 */ |
| uint16_t firstc_lo; /* FAT32 */ |
| }; |
| uint32_t size; |
| } __attribute__ ((packed)) fat_dentry_t; |
| extern fs_reg_t fat_reg; |
| extern void fat_lookup(ipc_callid_t, ipc_call_t *); |
| #endif |
| /** |
| * @} |
| */ |
| /branches/network/uspace/srv/fs/fat/fat_ops.c |
|---|
| 0,0 → 1,142 |
| /* |
| * Copyright (c) 2007 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| /** @addtogroup fs |
| * @{ |
| */ |
| /** |
| * @file fat_ops.c |
| * @brief Implementation of VFS operations for the FAT file system server. |
| */ |
| #include "fat.h" |
| #include "../../vfs/vfs.h" |
| #include <ipc/ipc.h> |
| #include <async.h> |
| #include <errno.h> |
| #define PLB_GET_CHAR(i) (fat_reg.plb_ro[(i) % PLB_SIZE]) |
| #define FAT_NAME_LEN 8 |
| #define FAT_EXT_LEN 3 |
| #define FAT_PAD ' ' |
| #define FAT_DENTRY_UNUSED 0x00 |
| #define FAT_DENTRY_E5_ESC 0x05 |
| #define FAT_DENTRY_DOT 0x2e |
| #define FAT_DENTRY_ERASED 0xe5 |
| /** Compare one component of path to a directory entry. |
| * |
| * @param dentry Directory entry to compare the path component with. |
| * @param start Index into PLB where the path component starts. |
| * @param last Index of the last character of the path in PLB. |
| * |
| * @return Zero on failure or delta such that (index + delta) % |
| * PLB_SIZE points to a new path component in PLB. |
| */ |
| static unsigned match_path_component(fat_dentry_t *dentry, unsigned start, |
| unsigned last) |
| { |
| unsigned cur; /* current position in PLB */ |
| int pos; /* current position in dentry->name or dentry->ext */ |
| bool name_processed = false; |
| bool dot_processed = false; |
| bool ext_processed = false; |
| if (last < start) |
| last += PLB_SIZE; |
| for (pos = 0, cur = start; (cur <= last) && (PLB_GET_CHAR(cur) != '/'); |
| pos++, cur++) { |
| if (!name_processed) { |
| if ((pos == FAT_NAME_LEN - 1) || |
| (dentry->name[pos + 1] == FAT_PAD)) { |
| /* this is the last character in name */ |
| name_processed = true; |
| } |
| if (dentry->name[0] == FAT_PAD) { |
| /* name is empty */ |
| name_processed = true; |
| } else if ((pos == 0) && (dentry->name[pos] == |
| FAT_DENTRY_E5_ESC)) { |
| if (PLB_GET_CHAR(cur) == 0xe5) |
| continue; |
| else |
| return 0; /* character mismatch */ |
| } else { |
| if (PLB_GET_CHAR(cur) == dentry->name[pos]) |
| continue; |
| else |
| return 0; /* character mismatch */ |
| } |
| } |
| if (!dot_processed) { |
| dot_processed = true; |
| pos = -1; |
| if (PLB_GET_CHAR(cur) != '.') |
| return 0; |
| continue; |
| } |
| if (!ext_processed) { |
| if ((pos == FAT_EXT_LEN - 1) || |
| (dentry->ext[pos + 1] == FAT_PAD)) { |
| /* this is the last character in ext */ |
| ext_processed = true; |
| } |
| if (dentry->ext[0] == FAT_PAD) { |
| /* ext is empty; the match will fail */ |
| ext_processed = true; |
| } else if (PLB_GET_CHAR(cur) == dentry->ext[pos]) { |
| continue; |
| } else { |
| /* character mismatch */ |
| return 0; |
| } |
| } |
| return 0; /* extra characters in the component */ |
| } |
| if (ext_processed || (name_processed && dentry->ext[0] == FAT_PAD)) |
| return cur - start; |
| else |
| return 0; |
| } |
| void fat_lookup(ipc_callid_t rid, ipc_call_t *request) |
| { |
| int first = IPC_GET_ARG1(*request); |
| int second = IPC_GET_ARG2(*request); |
| int dev_handle = IPC_GET_ARG3(*request); |
| } |
| /** |
| * @} |
| */ |
| /branches/network/uspace/srv/fs/fat/Makefile |
|---|
| 0,0 → 1,76 |
| # |
| # Copyright (c) 2006 Martin Decky |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions |
| # are met: |
| # |
| # - Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # - Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # - The name of the author may not be used to endorse or promote products |
| # derived from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| # |
| ## Setup toolchain |
| # |
| LIBC_PREFIX = ../../../lib/libc |
| LIBFS_PREFIX = ../../../lib/libfs |
| SOFTINT_PREFIX = ../../../lib/softint |
| include $(LIBC_PREFIX)/Makefile.toolchain |
| CFLAGS += -I $(LIBFS_PREFIX) |
| LIBS = $(LIBC_PREFIX)/libc.a $(LIBFS_PREFIX)/libfs.a |
| ## Sources |
| # |
| OUTPUT = fat |
| SOURCES = \ |
| fat.c \ |
| fat_ops.c |
| OBJECTS := $(addsuffix .o,$(basename $(SOURCES))) |
| .PHONY: all clean depend disasm |
| all: $(OUTPUT) disasm |
| -include Makefile.depend |
| clean: |
| -rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend |
| depend: |
| $(CC) $(DEFS) $(CFLAGS) -M $(SOURCES) > Makefile.depend |
| $(OUTPUT): $(OBJECTS) $(LIBS) |
| $(LD) -T $(LIBC_PREFIX)/arch/$(ARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map |
| disasm: |
| $(OBJDUMP) -d $(OUTPUT) >$(OUTPUT).disasm |
| %.o: %.S |
| $(CC) $(DEFS) $(AFLAGS) $(CFLAGS) -D__ASM__ -c $< -o $@ |
| %.o: %.s |
| $(AS) $(AFLAGS) $< -o $@ |
| %.o: %.c |
| $(CC) $(DEFS) $(CFLAGS) -c $< -o $@ |