113635b019
The original R_BIT and W_BIT definitions have nothing to do with the way these bits are used. Their distinct usage is more apparent when they have different names. Change-Id: Ia984457f900078b2e3502ceed565fead4e5bb965
196 lines
5.4 KiB
C
196 lines
5.4 KiB
C
#include "fs.h"
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#include "inode.h"
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#include "super.h"
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#include <minix/vfsif.h>
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#include <minix/bdev.h>
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static int cleanmount = 1;
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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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{
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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 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;
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int readonly, isroot;
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fs_dev = (dev_t) fs_m_in.REQ_DEV;
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label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
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label_len = (size_t) fs_m_in.REQ_PATH_LEN;
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readonly = (fs_m_in.REQ_FLAGS & REQ_RDONLY) ? 1 : 0;
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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, (vir_bytes) 0,
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(vir_bytes) fs_dev_label, label_len);
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if (r != OK) {
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printf("MFS %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. */
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if (bdev_open(fs_dev, readonly ? BDEV_R_BIT : (BDEV_R_BIT|BDEV_W_BIT) ) !=
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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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bdev_close(fs_dev);
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return(r);
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}
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/* Remember whether we were mounted cleanly so we know what to
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* do at unmount time
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*/
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if(superblock.s_flags & MFSFLAG_CLEAN)
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cleanmount = 1;
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/* clean check: if rw and not clean, switch to readonly */
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if(!(superblock.s_flags & MFSFLAG_CLEAN) && !readonly) {
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if(bdev_close(fs_dev) != OK)
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panic("couldn't bdev_close after found unclean FS");
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readonly = 1;
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if (bdev_open(fs_dev, BDEV_R_BIT) != OK) {
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panic("couldn't bdev_open after found unclean FS");
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return(EINVAL);
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}
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printf("MFS: WARNING: FS 0x%x unclean, mounting readonly\n", fs_dev);
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}
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lmfs_set_blocksize(superblock.s_block_size, major(fs_dev));
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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)) == NULL) {
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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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bdev_close(fs_dev);
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return(EINVAL);
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}
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if(root_ip->i_mode == 0) {
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printf("%s:%d zero mode for root inode?\n", __FILE__, __LINE__);
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put_inode(root_ip);
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superblock.s_dev = NO_DEV;
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bdev_close(fs_dev);
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return(EINVAL);
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}
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superblock.s_rd_only = readonly;
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superblock.s_is_root = 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_LO = 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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fs_m_out.RES_FLAGS = RES_HASPEEK;
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/* Mark it dirty */
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if(!superblock.s_rd_only) {
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superblock.s_flags &= ~MFSFLAG_CLEAN;
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if(write_super(&superblock) != OK)
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panic("mounting: couldn't write dirty superblock");
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}
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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 inode *rip;
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int r = OK;
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pmode_t bits;
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/* Temporarily open the file. */
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if( (rip = get_inode(fs_dev, (pino_t) fs_m_in.REQ_INODE_NR)) == NULL)
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return(EINVAL);
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if(rip->i_mountpoint) 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) 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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int fs_unmount()
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{
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/* Unmount a file system by device number. */
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int count;
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struct inode *rip, *root_ip;
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if(superblock.s_dev != fs_dev) 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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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) count += rip->i_count;
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if ((root_ip = find_inode(fs_dev, ROOT_INODE)) == NULL) {
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panic("MFS: couldn't find root inode\n");
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return(EINVAL);
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}
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if (count > 1) return(EBUSY); /* can't umount a busy file system */
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put_inode(root_ip);
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/* force any cached blocks out of memory */
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(void) fs_sync();
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/* Mark it clean if we're allowed to write _and_ it was clean originally. */
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if(cleanmount && !superblock.s_rd_only) {
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superblock.s_flags |= MFSFLAG_CLEAN;
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write_super(&superblock);
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}
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/* Close the device the file system lives on. */
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bdev_close(fs_dev);
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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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