95 lines
2.4 KiB
C
95 lines
2.4 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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PUBLIC int do_readsuper()
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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 hgfs_attr attr;
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int r;
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dprintf(("HGFS: readsuper (dev %x, flags %x)\n",
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(dev_t) m_in.REQ_DEV, m_in.REQ_FLAGS));
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if (m_in.REQ_FLAGS & REQ_ISROOT) {
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printf("HGFS: attempt to mount as root device\n");
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return EINVAL;
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}
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state.read_only = !!(m_in.REQ_FLAGS & REQ_RDONLY);
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state.dev = m_in.REQ_DEV;
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init_dentry();
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ino = init_inode();
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attr.a_mask = HGFS_ATTR_MODE | HGFS_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("HGFS: shared folders disabled\n");
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else if (opt.prefix[0] && (r == ENOENT || r == EACCES))
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printf("HGFS: unable to access the given prefix directory\n");
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else
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printf("HGFS: unable to access shared folders\n");
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return r;
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}
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m_out.RES_INODE_NR = INODE_NR(ino);
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m_out.RES_MODE = get_mode(ino, attr.a_mode);
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m_out.RES_FILE_SIZE_HI = ex64hi(attr.a_size);
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m_out.RES_FILE_SIZE_LO = ex64lo(attr.a_size);
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m_out.RES_UID = opt.uid;
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m_out.RES_GID = opt.gid;
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m_out.RES_DEV = NO_DEV;
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state.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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PUBLIC int do_unmount()
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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(("HGFS: do_unmount\n"));
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/* Decrease the reference count of the root inode. */
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if ((ino = find_inode(ROOT_INODE_NR)) == NIL_INODE)
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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("HGFS: in-use inodes left at unmount time!\n");
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state.mounted = FALSE;
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return OK;
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}
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