3 * - Root Filesystem Driver
12 #define MAX_FILE_SIZE 1024
15 tVFS_Node *Root_InitDevice(const char *Device, const char **Options);
16 int Root_MkNod(tVFS_Node *Node, const char *Name, Uint Flags);
17 tVFS_Node *Root_FindDir(tVFS_Node *Node, const char *Name);
18 char *Root_ReadDir(tVFS_Node *Node, int Pos);
19 size_t Root_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer);
20 size_t Root_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer);
21 tRamFS_File *Root_int_AllocFile(void);
24 tVFS_Driver gRootFS_Info = {
26 .InitDevice = Root_InitDevice
28 tRamFS_File RootFS_Files[MAX_FILES];
29 tVFS_ACL RootFS_DirACLs[3] = {
30 {{0,0}, {0,VFS_PERM_ALL}}, // Owner (Root)
31 {{1,0}, {0,VFS_PERM_ALL}}, // Group (Root)
32 {{0,-1}, {0,VFS_PERM_ALL^VFS_PERM_WRITE}} // World (Nobody)
34 tVFS_ACL RootFS_FileACLs[3] = {
35 {{0,0}, {0,VFS_PERM_ALL^VFS_PERM_EXECUTE}}, // Owner (Root)
36 {{1,0}, {0,VFS_PERM_ALL^VFS_PERM_EXECUTE}}, // Group (Root)
37 {{0,-1}, {0,VFS_PERM_READ}} // World (Nobody)
39 tVFS_NodeType gRootFS_DirType = {
40 .TypeName = "RootFS-Dir",
41 .ReadDir = Root_ReadDir,
42 .FindDir = Root_FindDir,
45 tVFS_NodeType gRootFS_FileType = {
46 .TypeName = "RootFS-File",
53 * \brief Initialise the root filesystem
55 tVFS_Node *Root_InitDevice(const char *Device, const char **Options)
58 if(strcmp(Device, "root") != 0) {
63 root = &RootFS_Files[0];
67 root->Node.ImplPtr = root;
71 = root->Node.ATime = now();
72 root->Node.NumACLs = 3;
73 root->Node.ACLs = RootFS_DirACLs;
75 root->Node.Type = &gRootFS_DirType;
81 * \fn int Root_MkNod(tVFS_Node *Node, const char *Name, Uint Flags)
82 * \brief Create an entry in the root directory
84 int Root_MkNod(tVFS_Node *Node, const char *Name, Uint Flags)
86 tRamFS_File *parent = Node->ImplPtr;
88 tRamFS_File *prev = NULL;
90 ENTER("pNode sName xFlags", Node, Name, Flags);
92 LOG("Sanity check name length - %i > %i", strlen(Name)+1, sizeof(child->Name));
93 if(strlen(Name) + 1 > sizeof(child->Name))
94 LEAVE_RET('i', EINVAL);
96 // Find last child, while we're at it, check for duplication
97 for( child = parent->Data.FirstChild; child; prev = child, child = child->Next )
99 if(strcmp(child->Name, Name) == 0) {
106 child = Root_int_AllocFile();
107 memset(child, 0, sizeof(tRamFS_File));
109 strcpy(child->Name, Name);
110 LOG("Name = '%s'", child->Name);
112 child->Parent = parent;
114 child->Data.FirstChild = NULL;
116 child->Node.ImplPtr = child;
117 child->Node.Flags = Flags;
118 child->Node.NumACLs = 3;
119 child->Node.Size = 0;
121 if(Flags & VFS_FFLAG_DIRECTORY)
123 child->Node.ACLs = RootFS_DirACLs;
124 child->Node.Type = &gRootFS_DirType;
126 if(Flags & VFS_FFLAG_SYMLINK)
127 child->Node.ACLs = RootFS_DirACLs;
129 child->Node.ACLs = RootFS_FileACLs;
130 child->Node.Type = &gRootFS_FileType;
137 parent->Data.FirstChild = child;
139 parent->Node.Size ++;
146 * \fn tVFS_Node *Root_FindDir(tVFS_Node *Node, const char *Name)
147 * \brief Find an entry in the filesystem
149 tVFS_Node *Root_FindDir(tVFS_Node *Node, const char *Name)
151 tRamFS_File *parent = Node->ImplPtr;
152 tRamFS_File *child = parent->Data.FirstChild;
154 ENTER("pNode sName", Node, Name);
156 for( child = parent->Data.FirstChild; child; child = child->Next )
158 LOG("child->Name = '%s'", child->Name);
159 if(strcmp(child->Name, Name) == 0)
161 LEAVE('p', &child->Node);
171 * \fn char *Root_ReadDir(tVFS_Node *Node, int Pos)
172 * \brief Get an entry from the filesystem
174 char *Root_ReadDir(tVFS_Node *Node, int Pos)
176 tRamFS_File *parent = Node->ImplPtr;
177 tRamFS_File *child = parent->Data.FirstChild;
179 for( ; child && Pos--; child = child->Next ) ;
181 if(child) return strdup(child->Name);
187 * \brief Read from a file in the root directory
189 size_t Root_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer)
191 tRamFS_File *file = Node->ImplPtr;
193 if(Offset > Node->Size) return 0;
195 if(Length > Node->Size)
197 if(Offset+Length > Node->Size)
198 Length = Node->Size - Offset;
200 memcpy(Buffer, file->Data.Bytes+Offset, Length);
206 * \brief Write to a file in the root directory
208 size_t Root_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer)
210 tRamFS_File *file = Node->ImplPtr;
212 ENTER("pNode XOffset xLength pBuffer", Node, Offset, Length, Buffer);
214 if(Offset > Node->Size) {
219 if(Offset + Length > MAX_FILE_SIZE)
221 Length = MAX_FILE_SIZE - Offset;
224 LOG("Buffer = '%.*s'", (int)Length, Buffer);
226 // Check if buffer needs to be expanded
227 if(Offset + Length > Node->Size)
229 void *tmp = realloc( file->Data.Bytes, Offset + Length );
231 Warning("Root_Write - Increasing buffer size failed");
235 file->Data.Bytes = tmp;
236 Node->Size = Offset + Length;
237 LOG("Expanded buffer to %i bytes", (int)Node->Size);
240 memcpy(file->Data.Bytes+Offset, Buffer, Length);
241 LOG("File - '%.*s'", Node->Size, file->Data.Bytes);
248 * \fn tRamFS_File *Root_int_AllocFile(void)
249 * \brief Allocates a file from the pool
251 tRamFS_File *Root_int_AllocFile(void)
254 for( i = 0; i < MAX_FILES; i ++ )
256 if( RootFS_Files[i].Name[0] == '\0' )
258 return &RootFS_Files[i];