118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
/* Functions to manage the superblock of the filesystem. These functions are
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* are called at the beginning and at the end of the server. */
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#include "inc.h"
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#include <string.h>
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#include <minix/com.h>
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#include <minix/u64.h>
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#include <minix/bdev.h>
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/* This function is called when the filesystem is umounted. It releases the
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* super block. */
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int release_v_pri(v_pri)
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register struct iso9660_vd_pri *v_pri;
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{
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/* Release the root dir record */
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release_dir_record(v_pri->dir_rec_root);
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v_pri->count = 0;
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return OK;
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}
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/* This function fullfill the super block data structure using the information
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* contained in the stream buf. Such stream is physically read from the device
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* . */
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int create_v_pri(v_pri,buf,address)
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register struct iso9660_vd_pri *v_pri;
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register char* buf;
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register unsigned long address;
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{
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struct dir_record *dir;
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v_pri->vd_type = buf[0];
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memcpy(v_pri->standard_id,buf + 1,sizeof(v_pri->standard_id));
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v_pri->vd_version = buf[6];
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memcpy(v_pri->system_id,buf + 8,sizeof(v_pri->system_id));
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memcpy(v_pri->volume_id,buf + 40,sizeof(v_pri->volume_id));
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memcpy(&v_pri->volume_space_size_l,buf + 80,
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sizeof(v_pri->volume_space_size_l));
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memcpy(&v_pri->volume_space_size_m,buf + 84,
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sizeof(v_pri->volume_space_size_m));
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memcpy(&v_pri->volume_set_size,buf + 120,sizeof(v_pri->volume_set_size));
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memcpy(&v_pri->volume_sequence_number,buf + 124,
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sizeof(v_pri->volume_sequence_number));
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memcpy(&v_pri->logical_block_size_l,buf + 128,
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sizeof(v_pri->logical_block_size_l));
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memcpy(&v_pri->logical_block_size_m,buf + 130,
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sizeof(v_pri->logical_block_size_m));
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memcpy(&v_pri->path_table_size_l,buf + 132,
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sizeof(v_pri->path_table_size_l));
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memcpy(&v_pri->path_table_size_m,buf + 136,
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sizeof(v_pri->path_table_size_m));
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memcpy(&v_pri->loc_l_occ_path_table,buf + 140,
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sizeof(v_pri->loc_l_occ_path_table));
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memcpy(&v_pri->loc_opt_l_occ_path_table,buf + 144,
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sizeof(v_pri->loc_opt_l_occ_path_table));
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memcpy(&v_pri->loc_m_occ_path_table, buf + 148,
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sizeof(v_pri->loc_m_occ_path_table));
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memcpy(&v_pri->loc_opt_m_occ_path_table,buf + 152,
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sizeof(v_pri->loc_opt_m_occ_path_table));
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dir = get_free_dir_record();
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if (dir == NULL) return EINVAL;
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create_dir_record(dir,buf + 156,(u32_t)(address + 156));
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v_pri->dir_rec_root = dir;
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dir->d_ino_nr = ROOT_INO_NR;
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memcpy(v_pri->volume_set_id,buf + 190,sizeof(v_pri->volume_set_id));
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memcpy(v_pri->publisher_id,buf + 318,sizeof(v_pri->publisher_id));
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memcpy(v_pri->data_preparer_id,buf + 446,sizeof(v_pri->data_preparer_id));
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memcpy(v_pri->application_id,buf + 574,sizeof(v_pri->application_id));
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memcpy(v_pri->copyright_file_id,buf + 702,sizeof(v_pri->copyright_file_id));
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memcpy(v_pri->abstract_file_id,buf + 739,sizeof(v_pri->abstract_file_id));
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memcpy(v_pri->bibl_file_id,buf + 776,sizeof(v_pri->bibl_file_id));
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memcpy(v_pri->volume_cre_date,buf + 813,sizeof(v_pri->volume_cre_date));
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memcpy(v_pri->volume_mod_date,buf + 830,sizeof(v_pri->volume_mod_date));
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memcpy(v_pri->volume_exp_date,buf + 847,sizeof(v_pri->volume_exp_date));
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memcpy(v_pri->volume_eff_date,buf + 864,sizeof(v_pri->volume_eff_date));
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v_pri->file_struct_ver = buf[881];
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return OK;
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}
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/* This function reads from a ISO9660 filesystem (in the device dev) the
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* super block and saves it in v_pri. */
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int read_vds(
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register struct iso9660_vd_pri *v_pri,
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register dev_t dev
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)
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{
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u64_t offset;
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int vol_ok = FALSE;
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int r;
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static char sbbuf[ISO9660_MIN_BLOCK_SIZE];
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int i = 0;
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offset = ((u64_t)(ISO9660_SUPER_BLOCK_POSITION));
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while (!vol_ok && i++<MAX_ATTEMPTS) {
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/* Read the sector of the super block. */
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r = bdev_read(dev, offset, sbbuf, ISO9660_MIN_BLOCK_SIZE, BDEV_NOFLAGS);
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if (r != ISO9660_MIN_BLOCK_SIZE) /* Damaged sector or what? */
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continue;
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if ((sbbuf[0] & BYTE) == VD_PRIMARY) {
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create_v_pri(v_pri,sbbuf,offset); /* copy the buffer in the data structure. */
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}
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if ((sbbuf[0] & BYTE) == VD_SET_TERM)
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/* I dont need to save anything about it */
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vol_ok = TRUE;
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offset += ISO9660_MIN_BLOCK_SIZE;
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}
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if (vol_ok == FALSE)
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return EINVAL; /* If no superblock was found... */
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else
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return OK; /* otherwise. */
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}
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