cc810ee4d9
The main motivation for this change is that only Loris supports multithreading, and Loris supports dynamic thread allocation, so the number of supported threads can be implemented as a bit flag (i.e., either 1 or "at least as many as VFS has"). The ABI break obviates the need to support file system versioning at this time, and several other aspects are better implemented as flags as well. Other changes: - replace peek/bpeek test upon mount with FS flag as well; - mark libsffs as 64-bit file size capable; - remove old (3.2.1) getdents support. Change-Id: I313eace9c50ed816656c31cd47d969033d952a03
97 lines
2.5 KiB
C
97 lines
2.5 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()
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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, (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("%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.REQ_FLAGS & REQ_RDONLY);
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state.s_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 = 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.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 = sffs_params->p_uid;
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m_out.RES_GID = sffs_params->p_gid;
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m_out.RES_DEV = NO_DEV;
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m_out.RES_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()
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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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