112 lines
3 KiB
C
112 lines
3 KiB
C
#include "inc.h"
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#include <string.h>
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#include <minix/com.h>
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#include <minix/vfsif.h>
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#include <minix/ds.h>
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#include "const.h"
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#include "glo.h"
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/*===========================================================================*
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* fs_readsuper *
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*===========================================================================*/
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PUBLIC int fs_readsuper() {
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cp_grant_id_t label_gid;
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size_t label_len;
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int r = OK;
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unsigned long tasknr;
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endpoint_t driver_e;
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int readonly, isroot;
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fs_dev = fs_m_in.REQ_DEV;
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label_gid = fs_m_in.REQ_GRANT;
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label_len = fs_m_in.REQ_PATH_LEN;
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readonly = 1; /* Always mount devices read only. */
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isroot = (fs_m_in.REQ_FLAGS & REQ_ISROOT) ? 1 : 0;
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if (label_len > sizeof(fs_dev_label))
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return(EINVAL);
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r = sys_safecopyfrom(fs_m_in.m_source, label_gid, 0, (vir_bytes)fs_dev_label,
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label_len, D);
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if (r != OK) {
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printf("ISOFS %s:%d safecopyfrom failed: %d\n", __FILE__, __LINE__, r);
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return(EINVAL);
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}
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r = ds_retrieve_label_num(fs_dev_label, &tasknr);
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if (r != OK) {
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printf("ISOFS %s:%d ds_retrieve_label_num failed for '%s': %d\n",
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__FILE__, __LINE__, fs_dev_label, r);
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return(EINVAL);
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}
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driver_e = tasknr;
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/* Map the driver endpoint for this major */
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driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e = driver_e;
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/* Open the device the file system lives on */
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if (dev_open(driver_e, fs_dev, driver_e,
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readonly ? R_BIT : (R_BIT|W_BIT)) != OK) {
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return(EINVAL);
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}
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/* Read the superblock */
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r = read_vds(&v_pri, fs_dev);
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if (r != OK)
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return(r);
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/* Return some root inode properties */
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fs_m_out.RES_INODE_NR = ID_DIR_RECORD(v_pri.dir_rec_root);
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fs_m_out.RES_MODE = v_pri.dir_rec_root->d_mode;
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fs_m_out.RES_FILE_SIZE_LO = v_pri.dir_rec_root->d_file_size;
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fs_m_out.RES_UID = SYS_UID; /* Always root */
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fs_m_out.RES_GID = SYS_GID; /* operator */
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return(r);
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}
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/*===========================================================================*
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* fs_mountpoint *
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*===========================================================================*/
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PUBLIC int fs_mountpoint() {
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/* This function looks up the mount point, it checks the condition whether
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* the partition can be mounted on the inode or not.
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*/
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register struct dir_record *rip;
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int r = OK;
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mode_t bits;
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/* Temporarily open the file. */
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if ((rip = get_dir_record(fs_m_in.REQ_INODE_NR)) == NULL)
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return(EINVAL);
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if (rip->d_mountpoint)
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r = EBUSY;
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/* If the inode is not a dir returns error */
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if ((rip->d_mode & I_TYPE) != I_DIRECTORY)
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r = ENOTDIR;
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release_dir_record(rip);
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if (r == OK)
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rip->d_mountpoint = TRUE;
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return(r);
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}
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/*===========================================================================*
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* fs_unmount *
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*===========================================================================*/
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PUBLIC int fs_unmount(void) {
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release_v_pri(&v_pri); /* Release the super block */
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dev_close(driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e, fs_dev);
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return(OK);
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}
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