249 lines
7.2 KiB
C
249 lines
7.2 KiB
C
/* Created (MFS based):
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* February 2010 (Evgeniy Ivanov)
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*/
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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 <minix/vfsif.h>
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#include <minix/bdev.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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{
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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 = OK;
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int readonly, isroot;
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u32_t mask;
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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 = (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, 0,
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(vir_bytes)fs_dev_label, label_len);
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if (r != OK) {
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printf("%s:%d fs_readsuper: safecopyfrom failed: %d\n",
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__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 ? 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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STATICINIT(superblock, 1);
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if (!superblock)
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panic("Can't allocate memory for superblock.");
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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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if (superblock->s_rev_level != EXT2_GOOD_OLD_REV) {
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struct super_block *sp = superblock; /* just shorter name */
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mask = ~SUPPORTED_INCOMPAT_FEATURES;
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if (HAS_INCOMPAT_FEATURE(sp, mask)) {
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if (HAS_INCOMPAT_FEATURE(sp, INCOMPAT_COMPRESSION & mask))
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printf("ext2: fs compression is not supported by server\n");
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if (HAS_INCOMPAT_FEATURE(sp, INCOMPAT_FILETYPE & mask))
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printf("ext2: fs in dir filetype is not supported by server\n");
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if (HAS_INCOMPAT_FEATURE(sp, INCOMPAT_RECOVER & mask))
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printf("ext2: fs recovery is not supported by server\n");
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if (HAS_INCOMPAT_FEATURE(sp, INCOMPAT_JOURNAL_DEV & mask))
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printf("ext2: fs journal dev is not supported by server\n");
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if (HAS_INCOMPAT_FEATURE(sp, INCOMPAT_META_BG & mask))
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printf("ext2: fs meta bg is not supported by server\n");
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return(EINVAL);
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}
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mask = ~SUPPORTED_RO_COMPAT_FEATURES;
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if (HAS_RO_COMPAT_FEATURE(sp, mask)) {
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if (HAS_RO_COMPAT_FEATURE(sp, RO_COMPAT_SPARSE_SUPER & mask)) {
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printf("ext2: sparse super is not supported by server, \
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remount read-only\n");
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}
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if (HAS_RO_COMPAT_FEATURE(sp, RO_COMPAT_LARGE_FILE & mask)) {
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printf("ext2: large files are not supported by server, \
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remount read-only\n");
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}
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if (HAS_RO_COMPAT_FEATURE(sp, RO_COMPAT_BTREE_DIR & mask)) {
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printf("ext2: dir's btree is not supported by server, \
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remount read-only\n");
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}
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return(EINVAL);
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}
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}
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if (superblock->s_state == EXT2_ERROR_FS) {
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printf("ext2: filesystem wasn't cleanly unmounted last time\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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set_blocksize(superblock);
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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("ext2: 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 != NULL && 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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if (root_ip != NULL && (root_ip->i_mode & I_TYPE) != I_DIRECTORY) {
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printf("%s:%d root inode has wrong type, it's not a DIR\n",
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__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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if (!readonly) {
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superblock->s_state = EXT2_ERROR_FS;
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superblock->s_mnt_count++;
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superblock->s_mtime = clock_time();
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write_super(superblock); /* Commit info, we just set above */
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}
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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_CONREQS = 1; /* We can handle only 1 request at a time */
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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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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)) == 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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printf("ext2: couldn't find root inode. Unmount failed.\n");
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panic("ext2: couldn't find root inode");
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return(EINVAL);
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}
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/* Sync fs data before checking count. In some cases VFS can force unmounting
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* and it will damage unsynced FS. We don't sync before checking root_ip since
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* if it is missing then something strange happened with FS, so it's better
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* to not use possibly corrupted data for syncing.
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*/
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if (!superblock->s_rd_only) {
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/* force any cached blocks out of memory */
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(void) fs_sync();
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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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if (!superblock->s_rd_only) {
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superblock->s_wtime = clock_time();
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superblock->s_state = EXT2_VALID_FS;
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write_super(superblock); /* Commit info, we just set above */
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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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