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Annotation of prex-old/usr/server/fs/ramfs/ramfs_vfsops.c, Revision 1.1.1.1

1.1       nbrk        1: /*
                      2:  * Copyright (c) 2006-2007, Kohsuke Ohtani
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. Neither the name of the author nor the names of any co-contributors
                     14:  *    may be used to endorse or promote products derived from this software
                     15:  *    without specific prior written permission.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     27:  * SUCH DAMAGE.
                     28:  */
                     29:
                     30: #include <sys/vnode.h>
                     31: #include <sys/mount.h>
                     32:
                     33: #include <errno.h>
                     34:
                     35: #include "ramfs.h"
                     36:
                     37: extern struct vnops ramfs_vnops;
                     38:
                     39: static int ramfs_mount(mount_t mp, char *dev, int flags, void *data);
                     40: static int ramfs_unmount(mount_t mp);
                     41: #define ramfs_sync     ((vfsop_sync_t)vfs_nullop)
                     42: #define ramfs_vget     ((vfsop_vget_t)vfs_nullop)
                     43: #define ramfs_statfs   ((vfsop_statfs_t)vfs_nullop)
                     44:
                     45: /*
                     46:  * File system operations
                     47:  */
                     48: struct vfsops ramfs_vfsops = {
                     49:        ramfs_mount,            /* mount */
                     50:        ramfs_unmount,          /* unmount */
                     51:        ramfs_sync,             /* sync */
                     52:        ramfs_vget,             /* vget */
                     53:        ramfs_statfs,           /* statfs */
                     54:        &ramfs_vnops,           /* vnops */
                     55: };
                     56:
                     57: /*
                     58:  * Mount a file system.
                     59:  */
                     60: static int
                     61: ramfs_mount(mount_t mp, char *dev, int flags, void *data)
                     62: {
                     63:        struct ramfs_node *node;
                     64:
                     65:        dprintf("ramfs_mount: dev=%s\n", dev);
                     66:
                     67:        /* Create a root node */
                     68:        node = ramfs_allocate_node("/", VDIR);
                     69:        if (node == NULL)
                     70:                return ENOMEM;
                     71:        mp->m_root->v_data = node;
                     72:        return 0;
                     73: }
                     74:
                     75: /*
                     76:  * Unmount a file system.
                     77:  *
                     78:  * NOTE: Currently, we don't support unmounting of the RAMFS. This is
                     79:  *       because we have to deallocate all nodes included in all sub
                     80:  *       directories, and it requires more work...
                     81:  */
                     82: static int
                     83: ramfs_unmount(mount_t mp)
                     84: {
                     85:
                     86:        return EBUSY;
                     87: }