cc810ee4d9
The main motivation for this change is that only Loris supports multithreading, and Loris supports dynamic thread allocation, so the number of supported threads can be implemented as a bit flag (i.e., either 1 or "at least as many as VFS has"). The ABI break obviates the need to support file system versioning at this time, and several other aspects are better implemented as flags as well. Other changes: - replace peek/bpeek test upon mount with FS flag as well; - mark libsffs as 64-bit file size capable; - remove old (3.2.1) getdents support. Change-Id: I313eace9c50ed816656c31cd47d969033d952a03
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
#include "inc.h"
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#include <minix/vfsif.h>
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#include <minix/bdev.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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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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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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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);
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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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/* Map the driver label for this major */
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bdev_driver(fs_dev, fs_dev_label);
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/* Open the device the file system lives on in read only mode */
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if (bdev_open(fs_dev, R_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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bdev_close(fs_dev);
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return(r);
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}
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lmfs_set_blocksize(v_pri.logical_block_size_l, major(fs_dev));
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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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fs_m_out.RES_FLAGS = RES_NOFLAGS;
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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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int fs_mountpoint()
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{
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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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/* 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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int fs_unmount(void) {
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release_v_pri(&v_pri); /* Release the super block */
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bdev_close(fs_dev);
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unmountdone = TRUE;
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return(OK);
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}
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