#include "filesys.h"
+#include "bitmap.h"
+#include "debug.h"
+#include "directory.h"
+#include "disk.h"
+#include "file.h"
+#include "filehdr.h"
+#include "lib.h"
+
+#define FREE_MAP_SECTOR 0
+#define ROOT_DIR_SECTOR 1
+
+#define NUM_DIR_ENTRIES 10
+#define ROOT_DIR_FILE_SIZE (sizeof (struct dir_entry) * NUM_DIR_ENTRIES)
+
+struct disk *filesys_disk;
+
+static struct file free_map_file, root_dir_file;
+
+static void
+do_format (void)
+{
+ struct bitmap free_map;
+ struct filehdr *map_hdr, *dir_hdr;
+ struct dir dir;
+
+ printk ("Formatting filesystem...");
+
+ /* Create the initial bitmap and reserve sectors for the
+ free map and root directory file headers. */
+ if (!bitmap_init (&free_map, disk_size (filesys_disk)))
+ PANIC ("bitmap creation failed--disk is too large");
+ bitmap_mark (&free_map, FREE_MAP_SECTOR);
+ bitmap_mark (&free_map, ROOT_DIR_SECTOR);
+
+ /* Allocate data sector(s) for the free map file
+ and write its file header to disk. */
+ map_hdr = filehdr_allocate (&free_map, bitmap_file_size (&free_map));
+ if (map_hdr == NULL)
+ PANIC ("free map creation failed--disk is too large");
+ filehdr_write (map_hdr, FREE_MAP_SECTOR);
+ filehdr_destroy (map_hdr);
+
+ /* Allocate data sector(s) for the root directory file
+ and write its file header to disk. */
+ dir_hdr = filehdr_allocate (&free_map, ROOT_DIR_FILE_SIZE);
+ if (dir_hdr == NULL)
+ PANIC ("root directory creation failed");
+ filehdr_write (dir_hdr, ROOT_DIR_SECTOR);
+ filehdr_destroy (dir_hdr);
+
+ /* Write out the free map now that we have space reserved
+ for it. */
+ if (!file_open (&free_map_file, FREE_MAP_SECTOR))
+ PANIC ("can't open free map file");
+ bitmap_write (&free_map, &free_map_file);
+ bitmap_destroy (&free_map);
+ file_close (&free_map_file);
+
+ /* Write out the root directory in the same way. */
+ if (!file_open (&root_dir_file, ROOT_DIR_SECTOR))
+ PANIC ("can't open root directory");
+ if (!dir_init (&dir, NUM_DIR_ENTRIES))
+ PANIC ("can't initialize root directory");
+ dir_write (&dir, &root_dir_file);
+ dir_destroy (&dir);
+ file_close (&free_map_file);
+
+ printk ("done.\n");
+}
-#ifdef FILESYS_STUB
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, filesystem initialization failed");
+
+ if (format)
+ do_format ();
+
+ if (!file_open (&free_map_file, FREE_MAP_SECTOR))
+ PANIC ("can't open free map file");
+ if (!file_open (&root_dir_file, ROOT_DIR_SECTOR))
+ PANIC ("can't open root dir file");
}
bool
-filesys_create (const char *name)
+filesys_create (const char *name, off_t initial_size)
{
+ struct dir dir;
+ struct bitmap free_map;
+ disk_sector_t hdr_sector;
+ struct filehdr *filehdr;
bool success = false;
- filesys_stub_send ("s'create' s", name);
- filesys_stub_receive ("s'create' b", &success);
+
+ /* Read the root directory. */
+ if (!dir_init (&dir, NUM_DIR_ENTRIES))
+ return false;
+ dir_read (&dir, &root_dir_file);
+ if (dir_lookup (&dir, name, NULL))
+ goto exit1;
+
+ /* Allocate a block for the file header. */
+ if (!bitmap_init (&free_map, disk_size (filesys_disk)))
+ goto exit1;
+ bitmap_read (&free_map, &free_map_file);
+ hdr_sector = bitmap_find_and_set (&free_map);
+ if (hdr_sector == BITMAP_ERROR)
+ goto exit2;
+
+ /* Add the file to the directory. */
+ if (!dir_add (&dir, name, hdr_sector))
+ goto exit2;
+
+ /* Allocate space for the file. */
+ filehdr = filehdr_allocate (&free_map, initial_size);
+ if (filehdr == NULL)
+ goto exit2;
+
+ /* Write everything back. */
+ filehdr_write (filehdr, hdr_sector);
+ dir_write (&dir, &root_dir_file);
+ bitmap_write (&free_map, &free_map_file);
+
+ success = true;
+
+ /* Clean up. */
+ filehdr_destroy (filehdr);
+ exit2:
+ bitmap_destroy (&free_map);
+ exit1:
+ dir_destroy (&dir);
+
return success;
}
-struct file *
-filesys_open (const char *name)
+bool
+filesys_open (const char *name, struct file *file)
{
- 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;
+ disk_sector_t hdr_sector;
+ bool success = false;
+
+ if (!dir_init (&dir, NUM_DIR_ENTRIES))
+ return false;
+ dir_read (&dir, &root_dir_file);
+ if (dir_lookup (&dir, name, &hdr_sector))
+ success = file_open (file, hdr_sector);
+
+ dir_destroy (&dir);
+ return success;
}
bool
filesys_remove (const char *name)
{
+ struct dir dir;
+ disk_sector_t hdr_sector;
+ struct filehdr *filehdr;
+ struct bitmap free_map;
bool success = false;
- filesys_stub_send ("s'create' s", name);
- filesys_stub_receive ("s'create' b", &success);
+
+ /* Read the root directory. */
+ if (!dir_init (&dir, NUM_DIR_ENTRIES))
+ return false;
+ dir_read (&dir, &root_dir_file);
+ if (!dir_lookup (&dir, name, &hdr_sector))
+ goto exit1;
+
+ /* Read the file header. */
+ filehdr = filehdr_read (hdr_sector);
+ if (filehdr == NULL)
+ goto exit1;
+
+ /* Allocate a block for the file header. */
+ if (!bitmap_init (&free_map, disk_size (filesys_disk)))
+ goto exit2;
+ bitmap_read (&free_map, &free_map_file);
+
+ /* Deallocate. */
+ filehdr_deallocate (filehdr, &free_map);
+ bitmap_reset (&free_map, hdr_sector);
+ dir_remove (&dir, name);
+
+ /* Write everything back. */
+ bitmap_write (&free_map, &free_map_file);
+ dir_write (&dir, &root_dir_file);
+
+ success = true;
+
+ /* Clean up. */
+ bitmap_destroy (&free_map);
+ exit2:
+ filehdr_destroy (filehdr);
+ exit1:
+ dir_destroy (&dir);
+
return success;
}
-#endif /* FILESYS_STUB */
+
+bool
+filesys_list (void)
+{
+ struct dir dir;
+
+ if (!dir_init (&dir, NUM_DIR_ENTRIES))
+ return false;
+ dir_read (&dir, &root_dir_file);
+ dir_list (&dir);
+ dir_destroy (&dir);
+
+ return true;
+}
+
+bool
+filesys_dump (void)
+{
+ struct bitmap free_map;
+ struct dir dir;
+
+ printk ("Free map:\n");
+ if (!bitmap_init (&free_map, disk_size (filesys_disk)))
+ return false;
+ bitmap_read (&free_map, &free_map_file);
+ bitmap_dump (&free_map);
+ bitmap_destroy (&free_map);
+ printk ("\n");
+
+ if (!dir_init (&dir, NUM_DIR_ENTRIES))
+ return false;
+ dir_read (&dir, &root_dir_file);
+ dir_dump (&dir);
+ dir_destroy (&dir);
+
+ return true;
+}
+
+static void must_succeed_function (int, int) NO_INLINE;
+
+static void
+must_succeed_function (int line_no, int success)
+{
+ if (!success)
+ PANIC ("filesys_self_test: operation failed on line %d", line_no);
+}
+
+#define MUST_SUCCEED(EXPR) must_succeed_function (__LINE__, EXPR)
+
+void
+filesys_self_test (void)
+{
+ static const char s[] = "This is a test string.";
+ struct file file;
+ char s2[sizeof s];
+
+ MUST_SUCCEED (filesys_create ("foo", sizeof s));
+ MUST_SUCCEED (filesys_open ("foo", &file));
+ 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);
+
+ MUST_SUCCEED (filesys_open ("foo", &file));
+ MUST_SUCCEED (file_read (&file, s2, sizeof s2) == sizeof s2);
+ MUST_SUCCEED (memcmp (s, s2, sizeof s) == 0);
+ MUST_SUCCEED (file_tell (&file) == sizeof s2);
+ MUST_SUCCEED (file_length (&file) == sizeof s2);
+ file_close (&file);
+
+ MUST_SUCCEED (filesys_remove ("foo"));
+
+ printk ("filesys: self test ok\n");
+}
projects / pintos-anon / blobdiff