0314acfb2d
Mostly removal of unused parameters from calls. Change-Id: I0eb7b568265d1669492d958e78b9e69d7cf6fc05
220 lines
6.4 KiB
C
220 lines
6.4 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 "buf.h"
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#include "inode.h"
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#include "super.h"
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#include <stdlib.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_mount *
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*===========================================================================*/
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int fs_mount(dev_t dev, unsigned int flags, struct fsdriver_node *root_node,
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unsigned int *res_flags)
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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.
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*/
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struct inode *root_ip;
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int r, readonly;
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u32_t mask;
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fs_dev = dev;
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readonly = (flags & REQ_RDONLY) ? 1 : 0;
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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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if(!(superblock = malloc(sizeof(*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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lmfs_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)) == 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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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(NULL);
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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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root_node->fn_ino_nr = root_ip->i_num;
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root_node->fn_mode = root_ip->i_mode;
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root_node->fn_size = root_ip->i_size;
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root_node->fn_uid = root_ip->i_uid;
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root_node->fn_gid = root_ip->i_gid;
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root_node->fn_dev = NO_DEV;
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*res_flags = RES_NOFLAGS;
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return(r);
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}
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/*===========================================================================*
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* fs_mountpt *
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*===========================================================================*/
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int fs_mountpt(ino_t ino_nr)
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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, ino_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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void fs_unmount(void)
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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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/* 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. This is an integrity
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* check only: VFS expects the unmount to succeed either way.
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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) count += rip->i_count;
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if (count != 1)
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printf("ext2: file system has %d in-use inodes!\n", count);
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if ((root_ip = find_inode(fs_dev, ROOT_INODE)) == NULL)
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panic("ext2: couldn't find root inode");
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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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fs_sync();
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}
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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(NULL);
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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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/* Throw all blocks out of the VM cache, to prevent corruption later. */
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lmfs_invalidate(fs_dev);
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/* Finish off the unmount. */
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superblock->s_dev = NO_DEV;
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}
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