104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
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#include "filesys/filesys.h"
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#include <debug.h>
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#include <stdio.h>
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#include <string.h>
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#include "filesys/file.h"
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#include "filesys/free-map.h"
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#include "filesys/inode.h"
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#include "filesys/directory.h"
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/* Partition that contains the file system. */
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struct block *fs_device;
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static void do_format (void);
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/* Initializes the file system module.
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If FORMAT is true, reformats the file system. */
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void
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filesys_init (bool format)
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{
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fs_device = block_get_role (BLOCK_FILESYS);
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if (fs_device == NULL)
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PANIC ("No file system device found, can't initialize file system.");
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inode_init ();
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free_map_init ();
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if (format)
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do_format ();
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free_map_open ();
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}
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/* Shuts down the file system module, writing any unwritten data
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to disk. */
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void
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filesys_done (void)
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{
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free_map_close ();
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}
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/* Creates a file named NAME with the given INITIAL_SIZE.
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Returns true if successful, false otherwise.
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Fails if a file named NAME already exists,
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or if internal memory allocation fails. */
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bool
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filesys_create (const char *name, off_t initial_size)
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{
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block_sector_t inode_sector = 0;
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struct dir *dir = dir_open_root ();
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bool success = (dir != NULL
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&& free_map_allocate (1, &inode_sector)
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&& inode_create (inode_sector, initial_size)
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&& dir_add (dir, name, inode_sector));
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if (!success && inode_sector != 0)
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free_map_release (inode_sector, 1);
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dir_close (dir);
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return success;
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}
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/* Opens the file with the given NAME.
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Returns the new file if successful or a null pointer
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otherwise.
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Fails if no file named NAME exists,
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or if an internal memory allocation fails. */
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struct file *
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filesys_open (const char *name)
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{
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struct dir *dir = dir_open_root ();
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struct inode *inode = NULL;
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if (dir != NULL)
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dir_lookup (dir, name, &inode);
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dir_close (dir);
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return file_open (inode);
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}
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/* Deletes the file named NAME.
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Returns true if successful, false on failure.
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Fails if no file named NAME exists,
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or if an internal memory allocation fails. */
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bool
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filesys_remove (const char *name)
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{
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struct dir *dir = dir_open_root ();
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bool success = dir != NULL && dir_remove (dir, name);
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dir_close (dir);
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return success;
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}
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/* Formats the file system. */
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static void
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do_format (void)
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{
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printf ("Formatting file system...");
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free_map_create ();
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if (!dir_create (ROOT_DIR_SECTOR, 16))
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PANIC ("root directory creation failed");
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free_map_close ();
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printf ("done.\n");
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}
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