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