95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* This file contains mount and unmount functionality.
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*
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* The entry points into this file are:
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* do_readsuper perform the READSUPER file system call
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* do_unmount perform the UNMOUNT file system call
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*
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* Created:
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* April 2009 (D.C. van Moolenbroek)
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*/
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#include "inc.h"
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/*===========================================================================*
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* do_readsuper *
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*===========================================================================*/
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int do_readsuper(void)
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{
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/* Mount the file system.
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*/
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char path[PATH_MAX];
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struct inode *ino;
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struct sffs_attr attr;
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int r;
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dprintf(("%s: readsuper (dev %x, flags %x)\n",
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sffs_name, m_in.m_vfs_fs_readsuper.device, m_in.vfs_fs_readsuper.flags));
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if (m_in.m_vfs_fs_readsuper.flags & REQ_ISROOT) {
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printf("%s: attempt to mount as root device\n", sffs_name);
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return EINVAL;
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}
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state.s_read_only = !!(m_in.m_vfs_fs_readsuper.flags & REQ_RDONLY);
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state.s_dev = m_in.m_vfs_fs_readsuper.device;
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init_dentry();
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ino = init_inode();
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attr.a_mask = SFFS_ATTR_MODE | SFFS_ATTR_SIZE;
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/* We cannot continue if we fail to get the properties of the root inode at
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* all, because we cannot guess the details of the root node to return to
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* VFS. Print a (hopefully) helpful error message, and abort the mount.
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*/
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if ((r = verify_inode(ino, path, &attr)) != OK) {
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if (r == EAGAIN)
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printf("%s: shared folders disabled\n", sffs_name);
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else if (sffs_params->p_prefix[0] && (r == ENOENT || r == EACCES))
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printf("%s: unable to access the given prefix directory\n",
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sffs_name);
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else
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printf("%s: unable to access shared folders\n", sffs_name);
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return r;
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}
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m_out.m_fs_vfs_readsuper.inode = INODE_NR(ino);
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m_out.m_fs_vfs_readsuper.mode = get_mode(ino, attr.a_mode);
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m_out.m_fs_vfs_readsuper.file_size = attr.a_size;
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m_out.m_fs_vfs_readsuper.uid = sffs_params->p_uid;
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m_out.m_fs_vfs_readsuper.gid = sffs_params->p_gid;
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m_out.m_fs_vfs_readsuper.device = NO_DEV;
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m_out.m_fs_vfs_readsuper.flags = RES_64BIT;
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state.s_mounted = TRUE;
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return OK;
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}
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/*===========================================================================*
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* do_unmount *
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*===========================================================================*/
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int do_unmount(void)
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{
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/* Unmount the file system.
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*/
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struct inode *ino;
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dprintf(("%s: do_unmount\n", sffs_name));
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/* Decrease the reference count of the root inode. */
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if ((ino = find_inode(ROOT_INODE_NR)) == NULL)
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return EINVAL;
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put_inode(ino);
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/* There should not be any referenced inodes anymore now. */
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if (have_used_inode())
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printf("%s: in-use inodes left at unmount time!\n", sffs_name);
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state.s_mounted = FALSE;
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return OK;
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}
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