1 | /* |
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2 | * devfs/devfs_context.c - devfs context related operations |
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3 | * |
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4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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6 | * |
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7 | * This file is part of ALMOS-kernel. |
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8 | * |
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9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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10 | * under the terms of the GNU General Public License as published by |
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11 | * the Free Software Foundation; version 2.0 of the License. |
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12 | * |
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13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |
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23 | #include <chdev.h> |
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24 | #include <driver.h> |
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25 | #include <kmem.h> |
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26 | #include <string.h> |
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27 | #include <vfs.h> |
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28 | #include <errno.h> |
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29 | #include <metafs.h> |
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30 | #include <cpu.h> |
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31 | |
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32 | #include <devfs.h> |
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33 | #include <devfs-private.h> |
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34 | |
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35 | |
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36 | struct devfs_db_s devfs_db; |
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37 | |
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38 | void devfs_root_init(void) |
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39 | { |
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40 | spinlock_init(&devfs_db.lock, "DevFs DB"); |
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41 | |
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42 | metafs_init(&devfs_db.root, |
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43 | #if CONFIG_ROOTFS_IS_VFAT |
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44 | "DEV" |
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45 | #else |
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46 | "dev" |
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47 | #endif |
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48 | ); |
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49 | } |
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50 | |
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51 | void devfs_register(struct device_s *dev) |
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52 | { |
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53 | spinlock_lock(&devfs_db.lock); |
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54 | metafs_register(&devfs_db.root, &dev->node); |
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55 | spinlock_unlock(&devfs_db.lock); |
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56 | } |
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57 | |
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58 | |
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59 | VFS_CREATE_CONTEXT(devfs_create_context) |
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60 | { |
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61 | struct devfs_context_s *ctx; |
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62 | |
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63 | VFS_SET(context->ctx_flags, VFS_FS_LOCAL); |
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64 | context->ctx_type = FS_TYPE_DEVFS; |
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65 | context->ctx_op = (struct vfs_context_op_s *) &devfs_ctx_op; |
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66 | context->ctx_inode_op = (struct vfs_inode_op_s *) &devfs_i_op; |
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67 | context->ctx_file_op = (struct vfs_file_op_s *) &devfs_f_op; |
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68 | |
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69 | ctx = &context->ctx_devfs; |
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70 | ctx->db = &devfs_db.root; |
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71 | |
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72 | return 0; |
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73 | } |
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74 | |
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75 | VFS_DESTROY_CONTEXT(devfs_destroy_context) |
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76 | { |
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77 | return 0; |
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78 | } |
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79 | |
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80 | VFS_READ_ROOT(devfs_read_root) |
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81 | { |
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82 | root->i_links = 1; |
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83 | root->i_size = 0; |
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84 | root->i_attr = VFS_DIR; |
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85 | root->i_number = vfs_inum_new(context); |
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86 | |
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87 | return 0; |
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88 | } |
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89 | |
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90 | VFS_WRITE_ROOT(devfs_write_root) |
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91 | { |
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92 | return 0; |
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93 | } |
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94 | |
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95 | KMEM_OBJATTR_INIT(devfs_kmem_context_init) |
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96 | { |
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97 | attr->type = KMEM_DEVFS_CTX; |
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98 | attr->name = "KCM DevFs CTX"; |
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99 | attr->size = sizeof(struct devfs_context_s); |
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100 | attr->aligne = 0; |
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101 | attr->min = CONFIG_DEVFS_CTX_MIN; |
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102 | attr->max = CONFIG_DEVFS_CTX_MAX; |
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103 | attr->ctor = NULL; |
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104 | attr->dtor = NULL; |
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105 | return 0; |
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106 | } |
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107 | |
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108 | |
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109 | const struct vfs_context_op_s devfs_ctx_op = |
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110 | { |
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111 | .create = devfs_create_context, |
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112 | .destroy = devfs_destroy_context, |
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113 | .read_root = devfs_read_root, |
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114 | .repli_root = NULL, |
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115 | .write_root = devfs_write_root |
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116 | }; |
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