-#include "lib/bitmap.h"
-#include "lib/debug.h"
-#include "lib/lib.h"
-
-/* Filesystem.
-
- The filesystem consists of a set of files. Each file has a
- header, represented by struct filehdr, that is stored by
- itself in a single sector (see filehdr.h). The header
- contains the file's length in bytes and an array that lists
- the sector numbers for the file's contents.
-
- Two files are special. The first special file is the free
- map, whose header is always stored in sector 0
- (FREE_MAP_SECTOR). The free map stores a bitmap (see
- lib/bitmap.h) that contains one bit for each sector on the
- disk. Each bit that corresponds to a sector within a file is
- set to true, and the other bits, which are not part of any
- file, are set to false.
-
- The second special file is the root directory, whose header is
- always stored in sector 1 (ROOT_DIR_SECTOR). The root
- directory file stores an array of `struct dir_entry' (see
- directory.h), each of which, if it is in use, associates a
- filename with the sector of the file's header.
-
- The filesystem implemented here has the following limitations:
-
- - No synchronization. Concurrent accesses will interfere
- with one another.
-
- - File size is fixed at creation time. Because the root
- directory is represented as a file, the number of files
- that may be created is also limited.
-
- - No indirect blocks. This limits maximum file size to the
- number of sector pointers that fit in a single sector
- times the size of a sector, or 126 * 512 == 63 kB given
- 32-bit sizes and 512-byte sectors.
-
- - No nested subdirectories.
-
- - Filenames limited to 14 characters.
-
- - A system crash mid-operation may corrupt the disk in a way
- that cannot be repaired automatically. No `fsck' tool is
- provided in any case.
-
- Note: for the purposes of the "user processes" assignment
- (project 2), please treat all the code in the filesys
- directory as a black box. No changes should be needed. For
- that project, a single lock external to the filesystem code
- suffices. */
-
-/* File header sectors for system files. */
-#define FREE_MAP_SECTOR 0 /* Free map file header sector. */
-#define ROOT_DIR_SECTOR 1 /* Root directory file header sector. */
-
-/* Root directory. */
-#define NUM_DIR_ENTRIES 10 /* Maximum number of directory entries. */
-#define ROOT_DIR_FILE_SIZE /* Root directory file size in bytes. */ \
- (sizeof (struct dir_entry) * NUM_DIR_ENTRIES)