-#include "filesys.h"
+#include "filesys/filesys.h"
+#include <debug.h>
+#include <stdio.h>
+#include <string.h>
+#include "filesys/file.h"
+#include "filesys/free-map.h"
+#include "filesys/inode.h"
+#include "filesys/directory.h"
+#include "devices/disk.h"
-#ifdef FILESYS_STUB
+/* The disk that contains the file system. */
+struct disk *filesys_disk;
+
+static void do_format (void);
+
+/* Initializes the file system module.
+ If FORMAT is true, reformats the file system. */
void
-filesys_init (bool reformat)
+filesys_init (bool format)
{
- if (reformat)
- printk ("filesystem stubs don't support formatting\n");
+ filesys_disk = disk_get (0, 1);
+ if (filesys_disk == NULL)
+ PANIC ("hd0:1 (hdb) not present, file system initialization failed");
+
+ inode_init ();
+ free_map_init ();
+
+ if (format)
+ do_format ();
+
+ free_map_open ();
}
+/* Shuts down the file system module, writing any unwritten data
+ to disk. */
+void
+filesys_done (void)
+{
+ free_map_close ();
+}
+\f
+/* Creates a file named NAME with the given INITIAL_SIZE.
+ Returns true if successful, false otherwise.
+ Fails if a file named NAME already exists,
+ or if internal memory allocation fails. */
bool
-filesys_create (const char *name)
+filesys_create (const char *name, off_t initial_size)
{
- bool success = false;
- filesys_stub_send ("s'create' s", name);
- filesys_stub_receive ("s'create' b", &success);
+ disk_sector_t inode_sector = 0;
+ struct dir *dir = dir_open_root ();
+ bool success = (dir != NULL
+ && free_map_allocate (1, &inode_sector)
+ && inode_create (inode_sector, initial_size)
+ && dir_add (dir, name, inode_sector));
+ if (!success && inode_sector != 0)
+ free_map_release (inode_sector, 1);
+ dir_close (dir);
+
return success;
}
+/* Opens the file with the given NAME.
+ Returns the new file if successful or a null pointer
+ otherwise.
+ Fails if no file named NAME exists,
+ or if an internal memory allocation fails. */
struct file *
-filesys_open (const char *name)
+filesys_open (const char *name)
{
- int32_t handle = -1;
- filesys_stub_stub ("s'open' i", name);
- filesys_stub_receive ("s'open' i", &handle);
- return handle == -1 ? NULL : (struct file *) handle;
+ struct dir *dir = dir_open_root ();
+ struct inode *inode = NULL;
+
+ if (dir != NULL)
+ dir_lookup (dir, name, &inode);
+ dir_close (dir);
+
+ return file_open (inode);
}
+/* Deletes the file named NAME.
+ Returns true if successful, false on failure.
+ Fails if no file named NAME exists,
+ or if an internal memory allocation fails. */
bool
filesys_remove (const char *name)
{
- bool success = false;
- filesys_stub_send ("s'create' s", name);
- filesys_stub_receive ("s'create' b", &success);
+ struct dir *dir = dir_open_root ();
+ bool success = dir != NULL && dir_remove (dir, name);
+ dir_close (dir);
+
return success;
}
-#endif /* FILESYS_STUB */
+\f
+static void must_succeed_function (int, bool) NO_INLINE;
+#define MUST_SUCCEED(EXPR) must_succeed_function (__LINE__, EXPR)
+
+/* Performs basic sanity checks on the file system.
+ The file system should not contain a file named `foo' when
+ called. */
+void
+filesys_self_test (void)
+{
+ static const char s[] = "This is a test string.";
+ static const char zeros[sizeof s] = {0};
+ struct file *file;
+ char s2[sizeof s];
+ int i;
+
+ filesys_remove ("foo");
+ for (i = 0; i < 2; i++)
+ {
+ /* Create file and check that it contains zeros
+ throughout the created length. */
+ MUST_SUCCEED (filesys_create ("foo", sizeof s));
+ MUST_SUCCEED ((file = filesys_open ("foo")) != NULL);
+ MUST_SUCCEED (file_read (file, s2, sizeof s2) == sizeof s2);
+ MUST_SUCCEED (memcmp (s2, zeros, sizeof s) == 0);
+ MUST_SUCCEED (file_tell (file) == sizeof s);
+ MUST_SUCCEED (file_length (file) == sizeof s);
+ file_close (file);
+
+ /* Reopen file and write to it. */
+ MUST_SUCCEED ((file = filesys_open ("foo")) != NULL);
+ MUST_SUCCEED (file_write (file, s, sizeof s) == sizeof s);
+ MUST_SUCCEED (file_tell (file) == sizeof s);
+ MUST_SUCCEED (file_length (file) == sizeof s);
+ file_close (file);
+
+ /* Reopen file and verify that it reads back correctly.
+ Delete file while open to check proper semantics. */
+ MUST_SUCCEED ((file = filesys_open ("foo")) != NULL);
+ MUST_SUCCEED (filesys_remove ("foo"));
+ MUST_SUCCEED (filesys_open ("foo") == NULL);
+ MUST_SUCCEED (file_read (file, s2, sizeof s) == sizeof s);
+ MUST_SUCCEED (memcmp (s, s2, sizeof s) == 0);
+ MUST_SUCCEED (file_tell (file) == sizeof s);
+ MUST_SUCCEED (file_length (file) == sizeof s);
+ file_close (file);
+ }
+
+ printf ("filesys: self test ok\n");
+}
+
+/* If SUCCESS is false, panics with an error complaining about
+ LINE_NO. */
+static void
+must_succeed_function (int line_no, bool success)
+{
+ if (!success)
+ PANIC ("filesys_self_test: operation failed on line %d", line_no);
+}
+\f
+/* Formats the file system. */
+static void
+do_format (void)
+{
+ printf ("Formatting file system...");
+ free_map_create ();
+ if (!dir_create (ROOT_DIR_SECTOR, 16))
+ PANIC ("root directory creation failed");
+ free_map_close ();
+ printf ("done.\n");
+}
projects / pintos-anon / blobdiff