root / prex-0.9.0 / usr / server / fs / ramfs / ramfs_vfsops.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2006-2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/vnode.h> |
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31 | #include <sys/mount.h> |
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32 | |||
33 | #include <errno.h> |
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34 | |||
35 | #include "ramfs.h" |
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36 | |||
37 | extern struct vnops ramfs_vnops; |
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38 | |||
39 | static int ramfs_mount(mount_t mp, char *dev, int flags, void *data); |
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40 | static int ramfs_unmount(mount_t mp); |
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41 | #define ramfs_sync ((vfsop_sync_t)vfs_nullop)
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42 | #define ramfs_vget ((vfsop_vget_t)vfs_nullop)
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43 | #define ramfs_statfs ((vfsop_statfs_t)vfs_nullop)
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44 | |||
45 | /*
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46 | * File system operations
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47 | */
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48 | struct vfsops ramfs_vfsops = {
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49 | ramfs_mount, /* mount */
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50 | ramfs_unmount, /* unmount */
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51 | ramfs_sync, /* sync */
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52 | ramfs_vget, /* vget */
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53 | ramfs_statfs, /* statfs */
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54 | &ramfs_vnops, /* vnops */
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55 | }; |
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56 | |||
57 | /*
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58 | * Mount a file system.
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59 | */
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60 | static int |
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61 | ramfs_mount(mount_t mp, char *dev, int flags, void *data) |
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62 | { |
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63 | struct ramfs_node *np;
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64 | |||
65 | DPRINTF(("ramfs_mount: dev=%s\n", dev));
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66 | |||
67 | /* Create a root node */
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68 | np = ramfs_allocate_node("/", VDIR);
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69 | if (np == NULL) |
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70 | return ENOMEM;
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71 | mp->m_root->v_data = np; |
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72 | return 0; |
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73 | } |
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74 | |||
75 | /*
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76 | * Unmount a file system.
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77 | *
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78 | * NOTE: Currently, we don't support unmounting of the RAMFS. This is
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79 | * because we have to deallocate all nodes included in all sub
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80 | * directories, and it requires more work...
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81 | */
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82 | static int |
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83 | ramfs_unmount(mount_t mp) |
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84 | { |
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85 | |||
86 | return EBUSY;
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87 | } |