b7e23b70e8
- slight code cleanup - neater exit procedure: exit when unmount message received and kill signal (from RS 'down' or reboot/shutdown) received (speed up unmount, but don't confuse VFS by exiting before/during unmount msg)
322 lines
8.6 KiB
C
322 lines
8.6 KiB
C
|
|
|
|
#include "fs.h"
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <minix/com.h>
|
|
#include <sys/stat.h>
|
|
#include "buf.h"
|
|
#include "inode.h"
|
|
#include "super.h"
|
|
#include "drivers.h"
|
|
#include <minix/ds.h>
|
|
#include <minix/vfsif.h>
|
|
|
|
|
|
/*===========================================================================*
|
|
* fs_readsuper_s *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_readsuper_s()
|
|
{
|
|
/* This function reads the superblock of the partition, gets the root inode
|
|
* and sends back the details of them. Note, that the FS process does not
|
|
* know the index of the vmnt object which refers to it, whenever the pathname
|
|
* lookup leaves a partition an ELEAVEMOUNT error is transferred back
|
|
* so that the VFS knows that it has to find the vnode on which this FS
|
|
* process' partition is mounted on.
|
|
*/
|
|
struct super_block *xp;
|
|
struct inode *root_ip;
|
|
cp_grant_id_t label_gid;
|
|
size_t label_len;
|
|
int r = OK;
|
|
unsigned long tasknr;
|
|
endpoint_t driver_e;
|
|
|
|
fs_dev = fs_m_in.REQ_DEV;
|
|
|
|
label_gid= fs_m_in.REQ_GRANT2;
|
|
label_len= fs_m_in.REQ_PATH_LEN;
|
|
|
|
if (label_len > sizeof(fs_dev_label))
|
|
{
|
|
printf("mfs:fs_readsuper: label too long\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
r= sys_safecopyfrom(fs_m_in.m_source, label_gid, 0, (vir_bytes)fs_dev_label,
|
|
label_len, D);
|
|
if (r != OK)
|
|
{
|
|
printf("mfs:fs_readsuper: safecopyfrom failed: %d\n", r);
|
|
return EINVAL;
|
|
}
|
|
|
|
r= ds_retrieve_u32(fs_dev_label, &tasknr);
|
|
if (r != OK)
|
|
{
|
|
printf("mfs:fs_readsuper: ds_retrieve_u32 failed for '%s': %d\n",
|
|
fs_dev_label, r);
|
|
return EINVAL;
|
|
}
|
|
|
|
driver_e= tasknr;
|
|
|
|
/* Map the driver endpoint for this major */
|
|
driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e = driver_e;
|
|
use_getuptime2= TRUE; /* Should be removed with old
|
|
* getuptime call.
|
|
*/
|
|
vfs_slink_storage = (char *)0xdeadbeef; /* Should be removed together
|
|
* with old lookup code.
|
|
*/;
|
|
|
|
/* Open the device the file system lives on. */
|
|
if (dev_open(driver_e, fs_dev, driver_e,
|
|
fs_m_in.REQ_READONLY ? R_BIT : (R_BIT|W_BIT)) != OK) {
|
|
return(EINVAL);
|
|
}
|
|
|
|
/* Fill in the super block. */
|
|
superblock.s_dev = fs_dev; /* read_super() needs to know which dev */
|
|
r = read_super(&superblock);
|
|
|
|
/* Is it recognized as a Minix filesystem? */
|
|
if (r != OK) {
|
|
superblock.s_dev = NO_DEV;
|
|
dev_close(driver_e, fs_dev);
|
|
return(r);
|
|
}
|
|
|
|
set_blocksize(superblock.s_block_size);
|
|
|
|
/* Get the root inode of the mounted file system. */
|
|
if ( (root_ip = get_inode(fs_dev, ROOT_INODE)) == NIL_INODE) {
|
|
printf("MFS: couldn't get root inode?!\n");
|
|
superblock.s_dev = NO_DEV;
|
|
dev_close(driver_e, fs_dev);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (root_ip != NIL_INODE && root_ip->i_mode == 0) {
|
|
printf("MFS: zero mode for root inode?!\n");
|
|
put_inode(root_ip);
|
|
superblock.s_dev = NO_DEV;
|
|
dev_close(driver_e, fs_dev);
|
|
return EINVAL;
|
|
}
|
|
|
|
superblock.s_rd_only = fs_m_in.REQ_READONLY;
|
|
superblock.s_is_root = fs_m_in.REQ_ISROOT;
|
|
|
|
/* Root inode properties */
|
|
fs_m_out.RES_INODE_NR = root_ip->i_num;
|
|
fs_m_out.RES_MODE = root_ip->i_mode;
|
|
fs_m_out.RES_FILE_SIZE = root_ip->i_size;
|
|
fs_m_out.RES_UID = root_ip->i_uid;
|
|
fs_m_out.RES_GID = root_ip->i_gid;
|
|
|
|
return r;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* fs_readsuper_o *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_readsuper_o()
|
|
{
|
|
/* This function reads the superblock of the partition, gets the root inode
|
|
* and sends back the details of them. Note, that the FS process does not
|
|
* know the index of the vmnt object which refers to it, whenever the pathname
|
|
* lookup leaves a partition an ELEAVEMOUNT error is transferred back
|
|
* so that the VFS knows that it has to find the vnode on which this FS
|
|
* process' partition is mounted on.
|
|
*/
|
|
struct super_block *xp;
|
|
struct inode *root_ip;
|
|
int r = OK;
|
|
phys_bytes ph;
|
|
|
|
fs_dev = fs_m_in.REQ_DEV;
|
|
|
|
/* Map the driver endpoint for this major */
|
|
driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e = fs_m_in.REQ_DRIVER_E;
|
|
boottime = fs_m_in.REQ_BOOTTIME;
|
|
vfs_slink_storage = fs_m_in.REQ_SLINK_STORAGE;
|
|
|
|
/* Fill in the super block. */
|
|
superblock.s_dev = fs_dev; /* read_super() needs to know which dev */
|
|
r = read_super(&superblock);
|
|
|
|
/* Is it recognized as a Minix filesystem? */
|
|
if (r != OK) {
|
|
superblock.s_dev = NO_DEV;
|
|
return(r);
|
|
}
|
|
|
|
set_blocksize(superblock.s_block_size);
|
|
|
|
/* Get the root inode of the mounted file system. */
|
|
root_ip = NIL_INODE; /* if 'r' not OK, make sure this is defined */
|
|
if (r == OK) {
|
|
if ( (root_ip = get_inode(fs_dev, ROOT_INODE)) == NIL_INODE)
|
|
r = err_code;
|
|
}
|
|
|
|
if (root_ip != NIL_INODE && root_ip->i_mode == 0) {
|
|
put_inode(root_ip);
|
|
r = EINVAL;
|
|
}
|
|
|
|
if (r != OK) return r;
|
|
superblock.s_rd_only = fs_m_in.REQ_READONLY;
|
|
superblock.s_is_root = fs_m_in.REQ_ISROOT;
|
|
|
|
/* Root inode properties */
|
|
fs_m_out.RES_INODE_NR = root_ip->i_num;
|
|
fs_m_out.RES_MODE = root_ip->i_mode;
|
|
fs_m_out.RES_FILE_SIZE = root_ip->i_size;
|
|
|
|
/* Partition properties */
|
|
fs_m_out.RES_MAXSIZE = superblock.s_max_size;
|
|
fs_m_out.RES_BLOCKSIZE = superblock.s_block_size;
|
|
|
|
return r;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* fs_mountpoint_o *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_mountpoint_o()
|
|
{
|
|
/* This function looks up the mount point, it checks the condition whether
|
|
* the partition can be mounted on the inode or not. If ok, it gets the
|
|
* mountpoint inode's details and stores the mounted vmnt's index (in the
|
|
* vmnt table) so that it can be transferred back when the pathname lookup
|
|
* encounters a mountpoint.
|
|
*/
|
|
register struct inode *rip;
|
|
int r = OK;
|
|
mode_t bits;
|
|
|
|
/* Get inode */
|
|
caller_uid = fs_m_in.REQ_UID;
|
|
caller_gid = fs_m_in.REQ_GID;
|
|
|
|
/* Temporarily open the file. */
|
|
if ( (rip = get_inode(fs_dev, fs_m_in.REQ_INODE_NR)) == NIL_INODE) {
|
|
printf("MFS(%d) get_inode by fs_mountpoint() failed\n", SELF_E);
|
|
return(EINVAL);
|
|
}
|
|
|
|
/* It may not be busy. */
|
|
if (rip->i_count > 2)
|
|
{
|
|
printf("mfs:fs_mountpoint: i_count = %d\n", rip->i_count);
|
|
r = EBUSY;
|
|
}
|
|
|
|
/* It may not be special. */
|
|
bits = rip->i_mode & I_TYPE;
|
|
if (bits == I_BLOCK_SPECIAL || bits == I_CHAR_SPECIAL) r = ENOTDIR;
|
|
|
|
if ((rip->i_mode & I_TYPE) != I_DIRECTORY) r = ENOTDIR;
|
|
|
|
if (r != OK) {
|
|
put_inode(rip);
|
|
return r;
|
|
}
|
|
|
|
rip->i_mountpoint = TRUE;
|
|
|
|
fs_m_out.m_source = rip->i_dev;/* Filled with the FS endp by the system */
|
|
fs_m_out.RES_INODE_NR = rip->i_num;
|
|
fs_m_out.RES_FILE_SIZE = rip->i_size;
|
|
fs_m_out.RES_MODE = rip->i_mode;
|
|
|
|
return r;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* fs_mountpoint_s *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_mountpoint_s()
|
|
{
|
|
/* This function looks up the mount point, it checks the condition whether
|
|
* the partition can be mounted on the inode or not.
|
|
*/
|
|
register struct inode *rip;
|
|
int r = OK;
|
|
mode_t bits;
|
|
|
|
/* Temporarily open the file. */
|
|
if ( (rip = get_inode(fs_dev, fs_m_in.REQ_INODE_NR)) == NIL_INODE) {
|
|
printf("MFS(%d) get_inode by fs_mountpoint() failed\n", SELF_E);
|
|
return(EINVAL);
|
|
}
|
|
|
|
if (rip->i_mountpoint)
|
|
r= EBUSY;
|
|
|
|
/* It may not be special. */
|
|
bits = rip->i_mode & I_TYPE;
|
|
if (bits == I_BLOCK_SPECIAL || bits == I_CHAR_SPECIAL) r = ENOTDIR;
|
|
|
|
put_inode(rip);
|
|
|
|
if (r == OK)
|
|
rip->i_mountpoint = TRUE;
|
|
return r;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* fs_unmount *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_unmount()
|
|
{
|
|
/* Unmount a file system by device number. */
|
|
struct super_block *sp1;
|
|
int count;
|
|
register struct inode *rip;
|
|
|
|
/* Close the device the file system lives on. */
|
|
dev_close(driver_endpoints[(fs_dev >> MAJOR) & BYTE].driver_e, fs_dev);
|
|
|
|
if(superblock.s_dev != fs_dev)
|
|
return EINVAL;
|
|
|
|
/* See if the mounted device is busy. Only 1 inode using it should be
|
|
* open -- the root inode -- and that inode only 1 time.
|
|
*/
|
|
count = 0;
|
|
for (rip = &inode[0]; rip < &inode[NR_INODES]; rip++) {
|
|
if (rip->i_count > 0 && rip->i_dev == fs_dev) {
|
|
count += rip->i_count;
|
|
}
|
|
}
|
|
|
|
if (count > 1) {
|
|
return(EBUSY); /* can't umount a busy file system */
|
|
}
|
|
|
|
/* Put the root inode */
|
|
rip = get_inode(fs_dev, ROOT_INODE);
|
|
put_inode(rip);
|
|
put_inode(rip);
|
|
|
|
/* Sync the disk, and invalidate cache. */
|
|
(void) fs_sync(); /* force any cached blocks out of memory */
|
|
|
|
/* Finish off the unmount. */
|
|
superblock.s_dev = NO_DEV;
|
|
|
|
unmountdone = TRUE;
|
|
|
|
return OK;
|
|
}
|
|
|
|
|
|
|