root / prex-0.9.0 / usr / server / fs / fatfs / fatfs_vfsops.c @ 03e9c04a
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/*
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* Copyright (c) 2005-2008, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/prex.h> |
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#include <sys/stat.h> |
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#include <sys/vnode.h> |
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#include <sys/file.h> |
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#include <sys/mount.h> |
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#include <sys/buf.h> |
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#include <ctype.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <fcntl.h> |
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#include "fatfs.h" |
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static int fatfs_mount (mount_t mp, char *dev, int flags, void *data); |
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static int fatfs_unmount(mount_t mp); |
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#define fatfs_sync ((vfsop_sync_t)vfs_nullop)
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static int fatfs_vget (mount_t mp, vnode_t vp); |
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#define fatfs_statfs ((vfsop_statfs_t)vfs_nullop)
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/*
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* File system operations
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*/
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struct vfsops fatfs_vfsops = {
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fatfs_mount, /* mount */
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fatfs_unmount, /* unmount */
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fatfs_sync, /* sync */
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fatfs_vget, /* vget */
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fatfs_statfs, /* statfs */
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&fatfs_vnops, /* vnops */
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}; |
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/*
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* Read BIOS parameter block.
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* Return 0 on sucess.
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*/
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static int |
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fat_read_bpb(struct fatfsmount *fmp)
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{ |
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struct fat_bpb *bpb;
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size_t size; |
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int error;
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bpb = malloc(SEC_SIZE); |
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if (bpb == NULL) |
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return ENOMEM;
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/* Read boot sector (block:0) */
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size = SEC_SIZE; |
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error = device_read(fmp->dev, bpb, &size, 0);
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if (error) {
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free(bpb); |
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return error;
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} |
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if (bpb->bytes_per_sector != SEC_SIZE) {
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DPRINTF(("fatfs: invalid sector size\n"));
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free(bpb); |
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return EINVAL;
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} |
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/* Build FAT mount data */
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fmp->fat_start = bpb->hidden_sectors + bpb->reserved_sectors; |
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fmp->root_start = fmp->fat_start + |
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(bpb->num_of_fats * bpb->sectors_per_fat); |
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fmp->data_start = |
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fmp->root_start + (bpb->root_entries / DIR_PER_SEC); |
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fmp->sec_per_cl = bpb->sectors_per_cluster; |
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fmp->cluster_size = bpb->sectors_per_cluster * SEC_SIZE; |
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fmp->last_cluster = (bpb->total_sectors - fmp->data_start) / |
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bpb->sectors_per_cluster + CL_FIRST; |
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fmp->free_scan = CL_FIRST; |
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if (!strncmp((const char *)bpb->file_sys_id, "FAT12 ", 8)) { |
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fmp->fat_type = 12;
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fmp->fat_mask = FAT12_MASK; |
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fmp->fat_eof = CL_EOF & FAT12_MASK; |
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} else if (!strncmp((const char *)bpb->file_sys_id, "FAT16 ", 8)) { |
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fmp->fat_type = 16;
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fmp->fat_mask = FAT16_MASK; |
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fmp->fat_eof = CL_EOF & FAT16_MASK; |
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} else {
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/* FAT32 is not supported now! */
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DPRINTF(("fatfs: invalid FAT type\n"));
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free(bpb); |
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return EINVAL;
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} |
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free(bpb); |
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DPRINTF(("----- FAT info -----\n"));
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DPRINTF(("drive:%x\n", (int)bpb->physical_drive)); |
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DPRINTF(("total_sectors:%d\n", (int)bpb->total_sectors)); |
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DPRINTF(("heads :%d\n", (int)bpb->heads)); |
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DPRINTF(("serial :%x\n", (int)bpb->serial_no)); |
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DPRINTF(("cluster size:%u sectors\n", (int)fmp->sec_per_cl)); |
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DPRINTF(("fat_type :FAT%u\n", (int)fmp->fat_type)); |
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DPRINTF(("fat_eof :0x%x\n\n", (int)fmp->fat_eof)); |
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return 0; |
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} |
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/*
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* Mount file system.
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*/
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static int |
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fatfs_mount(mount_t mp, char *dev, int flags, void *data) |
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{ |
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struct fatfsmount *fmp;
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vnode_t vp; |
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int error = 0; |
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DPRINTF(("fatfs_mount device=%s\n", dev));
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fmp = malloc(sizeof(struct fatfsmount)); |
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if (fmp == NULL) |
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return ENOMEM;
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fmp->dev = mp->m_dev; |
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if (fat_read_bpb(fmp) != 0) |
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goto err1;
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error = ENOMEM; |
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fmp->io_buf = malloc(fmp->sec_per_cl * SEC_SIZE); |
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if (fmp->io_buf == NULL) |
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goto err1;
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fmp->fat_buf = malloc(SEC_SIZE * 2);
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if (fmp->fat_buf == NULL) |
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goto err2;
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fmp->dir_buf = malloc(SEC_SIZE); |
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if (fmp->dir_buf == NULL) |
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goto err3;
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mutex_init(&fmp->lock); |
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mp->m_data = fmp; |
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vp = mp->m_root; |
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vp->v_blkno = CL_ROOT; |
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return 0; |
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err3:
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free(fmp->fat_buf); |
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err2:
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free(fmp->io_buf); |
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err1:
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free(fmp); |
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return error;
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} |
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/*
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* Unmount the file system.
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*/
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static int |
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fatfs_unmount(mount_t mp) |
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{ |
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struct fatfsmount *fmp;
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fmp = mp->m_data; |
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free(fmp->dir_buf); |
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free(fmp->fat_buf); |
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free(fmp->io_buf); |
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mutex_destroy(&fmp->lock); |
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free(fmp); |
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return 0; |
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} |
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/*
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* Prepare the FAT specific node and fill the vnode.
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*/
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static int |
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fatfs_vget(mount_t mp, vnode_t vp) |
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{ |
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struct fatfs_node *np;
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np = malloc(sizeof(struct fatfs_node)); |
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if (np == NULL) |
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return ENOMEM;
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vp->v_data = np; |
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return 0; |
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} |
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