| 1 | /*
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| 2 | * Copyright (c) 2007 Jakub Jermar
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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 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup fs
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file vfs_node.c
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| 35 | * @brief Various operations on VFS nodes have their home in this file.
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| 36 | */
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| 37 |
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| 38 | #include "vfs.h"
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| 39 |
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| 40 | /** Increment reference count of a VFS node.
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| 41 | *
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| 42 | * @param node VFS node that will have its refcnt incremented.
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| 43 | */
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| 44 | void vfs_node_addref(vfs_node_t *node)
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| 45 | {
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| 46 | /* TODO */
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| 47 | }
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| 48 |
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| 49 | /** Decrement reference count of a VFS node.
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| 50 | *
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| 51 | * This function handles the case when the reference count drops to zero.
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| 52 | *
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| 53 | * @param node VFS node that will have its refcnt decremented.
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| 54 | */
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| 55 | void vfs_node_delref(vfs_node_t *node)
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| 56 | {
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| 57 | /* TODO */
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| 58 | }
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| 59 |
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| 60 | /** Find VFS node.
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| 61 | *
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| 62 | * This function will try to lookup the given triplet in the VFS node hash
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| 63 | * table. In case the triplet is not found there, a new VFS node is created.
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| 64 | * In any case, the VFS node will have its reference count incremented. Every
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| 65 | * node returned by this call should be eventually put back by calling
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| 66 | * vfs_node_put() on it.
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| 67 | *
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| 68 | * @param triplet Triplet encoding the identity of the VFS node.
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| 69 | *
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| 70 | * @return VFS node corresponding to the given triplet.
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| 71 | */
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| 72 | vfs_node_t *vfs_node_get(vfs_triplet_t *triplet)
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| 73 | {
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| 74 | /* TODO */
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| 75 | return NULL;
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| 76 | }
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| 77 |
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| 78 | /** Return VFS node when no longer needed by the caller.
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| 79 | *
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| 80 | * This function will remove the reference on the VFS node created by
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| 81 | * vfs_node_get(). This function can only be called as a closing bracket to the
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| 82 | * preceding vfs_node_get() call.
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| 83 | *
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| 84 | * @param node VFS node being released.
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| 85 | */
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| 86 | void vfs_node_put(vfs_node_t *node)
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| 87 | {
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| 88 | vfs_node_delref(node);
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| 89 | }
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| 90 |
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| 91 | /**
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| 92 | * @}
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| 93 | */
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