tmpfs.c File Reference

#include <miniOS/fs/tmpfs.h>
#include <miniOS/fs/ext2.h>
#include <miniOS/fs/vfs.h>
#include <miniOS/mm/heap.h>
#include <miniOS/io.h>
#include <string.h>

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Classes
struct	tmpfs_inode_t

Macros
#define	TMPFS_MAX_INODES   64
#define	TMPFS_BLOCK_SIZE   4096
#define	TMPFS_MAX_BLOCKS   16 /* max direct blocks per inode = 64 KiB max file size */
#define	TMPFS_ROOT_INO   1
#define	TMPFS_NAME_MAX   255

Functions
static tmpfs_inode_t *	tmpfs_inode_get (uint32_t ino)
static tmpfs_inode_t *	tmpfs_alloc_inode (uint16_t mode)
static void	tmpfs_free_inode (tmpfs_inode_t *ino)
static void *	tmpfs_get_or_alloc_block (tmpfs_inode_t *ino, uint32_t bidx)
static int	tmpfs_dir_append (tmpfs_inode_t *dir, uint32_t child_ino, const char *name, uint8_t file_type)
static uint32_t	tmpfs_dir_find (tmpfs_inode_t *dir, const char *name, uint8_t *ftype_out)
static int	tmpfs_dir_remove (tmpfs_inode_t *dir, const char *name)
static uint32_t	tmpfs_walk_path (const char *rel_path, uint8_t *ftype_out)
static int	tmpfs_lookup (const char *path, vfs_inode_info_t *out)
static int	tmpfs_read (uint32_t ino, uint64_t off, void *buf, uint32_t len)
static int	tmpfs_write (uint32_t ino, uint64_t off, const void *buf, uint32_t len)
static int	tmpfs_readdir (uint32_t ino, uint64_t *offset, vfs_dirent_cb_t cb, void *ud)
static int	tmpfs_flush (uint32_t ino)
static void	tmpfs_set_active_root (uint32_t ino)
static int	tmpfs_truncate (uint32_t ino, uint64_t new_size)
static int	tmpfs_readlink (uint32_t ino, char *buf, uint32_t len)

Variables
static tmpfs_inode_t	g_tmpfs_inodes [TMPFS_MAX_INODES]
static uint32_t	g_tmpfs_next_ino = TMPFS_ROOT_INO
static int	g_tmpfs_initialized = 0
static uint32_t	g_tmpfs_active_root = TMPFS_ROOT_INO

: Symlink filename (null-terminated; max TMPFS_NAME_MAX chars).
tmpfs_symlink() - Create a symlink in a tmpfs directory. @parent_ino: Parent directory inode number. @target: Target string (null-terminated; max 255 chars stored). Returns : 0 on success, -1 on error (name too long, inode table full, etc.).
static vfs_ops_t	g_tmpfs_ops
static int	tmpfs_symlink (uint32_t parent_ino, const char *name, const char *target)
static int	tmpfs_chmod (uint32_t ino, uint16_t mode)
static int	tmpfs_rename (uint32_t old_parent_ino, const char *old_name, uint32_t new_parent_ino, const char *new_name)
static int	tmpfs_statfs (vfs_statfs_t *out)
static int	tmpfs_fs_mount (const char *source, const char *target, const void *data)
void	tmpfs_init (void)
vfs_ops_t *	tmpfs_get_ops (void)
uint32_t	tmpfs_alloc_root (void)
int	tmpfs_create (uint32_t parent_ino, const char *name, uint16_t mode, uint32_t *new_ino_out)
int	tmpfs_create_device (uint32_t parent_ino, const char *name, uint8_t device_type, uint32_t *new_ino_out)
int	tmpfs_mknod (uint32_t parent_ino, const char *name, uint16_t mode, uint32_t dev, uint32_t *new_ino_out)
int	tmpfs_mkdir (uint32_t parent_ino, const char *name, uint32_t *new_ino_out)
int	tmpfs_unlink (uint32_t parent_ino, const char *name)
int	tmpfs_rmdir (uint32_t parent_ino, const char *name)

Macro Definition Documentation

TMPFS_BLOCK_SIZE

#define TMPFS_BLOCK_SIZE   4096

TMPFS_MAX_BLOCKS

#define TMPFS_MAX_BLOCKS   16 /* max direct blocks per inode = 64 KiB max file size */

TMPFS_MAX_INODES

#define TMPFS_MAX_INODES   64

TMPFS_NAME_MAX

#define TMPFS_NAME_MAX   255

TMPFS_ROOT_INO

#define TMPFS_ROOT_INO   1

Function Documentation

tmpfs_alloc_inode()

tmpfs_inode_t * tmpfs_alloc_inode ( uint16_t mode )

static

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tmpfs_alloc_root()

uint32_t tmpfs_alloc_root

(

void

)

tmpfs_alloc_root() - Allocate a fresh root directory inode for a new mount.

Each call to mount tmpfs <target> should call this to get an isolated root directory. The returned inode number is stored in vfs_mount_t.root_ino and activated via set_root() before each path lookup on that mount.

Returns

: New inode number, or 0 on failure (inode table full).

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tmpfs_chmod()

int tmpfs_chmod ( uint32_t ino, uint16_t mode )

static

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tmpfs_create()

int tmpfs_create	(	uint32_t	parent_ino,
		const char *	name,
		uint16_t	mode,
		uint32_t *	new_ino_out )

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tmpfs_create_device()

int tmpfs_create_device	(	uint32_t	parent_ino,
		const char *	name,
		uint8_t	device_type,
		uint32_t *	new_ino_out )

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tmpfs_dir_append()

int tmpfs_dir_append ( tmpfs_inode_t * dir, uint32_t child_ino, const char * name, uint8_t file_type )

static

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tmpfs_dir_find()

uint32_t tmpfs_dir_find ( tmpfs_inode_t * dir, const char * name, uint8_t * ftype_out )

static

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tmpfs_dir_remove()

int tmpfs_dir_remove ( tmpfs_inode_t * dir, const char * name )

static

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tmpfs_flush()

int tmpfs_flush ( uint32_t ino )

static

tmpfs_free_inode()

void tmpfs_free_inode ( tmpfs_inode_t * ino )

static

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tmpfs_fs_mount()

int tmpfs_fs_mount ( const char * source, const char * target, const void * data )

static

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tmpfs_get_ops()

vfs_ops_t * tmpfs_get_ops

(

void

)

tmpfs_get_ops() - Return a pointer to the static tmpfs vfs_ops_t table.

The returned pointer is valid for the lifetime of the kernel.

Returns

: Pointer to static vfs_ops_t with lookup, read, readdir, write, flush set.

tmpfs_get_or_alloc_block()

void * tmpfs_get_or_alloc_block ( tmpfs_inode_t * ino, uint32_t bidx )

static

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tmpfs_init()

void tmpfs_init

(

void

)

tmpfs_init() - Initialise the tmpfs inode pool and register the "tmpfs" type.

Initialises the shared inode table (inode 1 = internal sentinel root) and calls register_filesystem("tmpfs", ...) so that vfs_mount_fstype("tmpfs", ...) works. Safe to call multiple times — subsequent calls are no-ops. Must be called before any vfs_mount_fstype("tmpfs", ...) invocation.

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tmpfs_inode_get()

tmpfs_inode_t * tmpfs_inode_get ( uint32_t ino )

static

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tmpfs_lookup()

int tmpfs_lookup ( const char * path, vfs_inode_info_t * out )

static

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tmpfs_mkdir()

int tmpfs_mkdir	(	uint32_t	parent_ino,
		const char *	name,
		uint32_t *	new_ino_out )

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tmpfs_mknod()

int tmpfs_mknod	(	uint32_t	parent_ino,
		const char *	name,
		uint16_t	mode,
		uint32_t	dev,
		uint32_t *	new_ino_out )

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tmpfs_read()

int tmpfs_read ( uint32_t ino, uint64_t off, void * buf, uint32_t len )

static

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tmpfs_readdir()

int tmpfs_readdir ( uint32_t ino, uint64_t * offset, vfs_dirent_cb_t cb, void * ud )

static

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tmpfs_readlink()

int tmpfs_readlink ( uint32_t ino, char * buf, uint32_t len )

static

tmpfs_readlink() - Read the stored symlink_target of a tmpfs symlink inode. @ino: Inode number (must have i_mode & EXT2_S_IFLNK set). @buf: Output buffer. NOT null-terminated (POSIX readlink semantics). @len: Maximum bytes to copy.

Returns

: Number of bytes copied (>= 0), or -1 if not a symlink or error.

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tmpfs_rename()

int tmpfs_rename ( uint32_t old_parent_ino, const char * old_name, uint32_t new_parent_ino, const char * new_name )

static

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tmpfs_rmdir()

int tmpfs_rmdir	(	uint32_t	parent_ino,
		const char *	name )

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tmpfs_set_active_root()

void tmpfs_set_active_root ( uint32_t ino )

static

tmpfs_statfs()

int tmpfs_statfs ( vfs_statfs_t * out )

static

tmpfs_symlink()

int tmpfs_symlink ( uint32_t parent_ino, const char * name, const char * target )

static

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tmpfs_truncate()

int tmpfs_truncate ( uint32_t ino, uint64_t new_size )

static

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tmpfs_unlink()

int tmpfs_unlink	(	uint32_t	parent_ino,
		const char *	name )

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tmpfs_walk_path()

uint32_t tmpfs_walk_path ( const char * rel_path, uint8_t * ftype_out )

static

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tmpfs_write()

int tmpfs_write ( uint32_t ino, uint64_t off, const void * buf, uint32_t len )

static

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Variable Documentation

g_tmpfs_active_root

uint32_t g_tmpfs_active_root = TMPFS_ROOT_INO

static

g_tmpfs_initialized

int g_tmpfs_initialized = 0

static

g_tmpfs_inodes

tmpfs_inode_t g_tmpfs_inodes[TMPFS_MAX_INODES]

static

g_tmpfs_next_ino

uint32_t g_tmpfs_next_ino = TMPFS_ROOT_INO

static

g_tmpfs_ops

vfs_ops_t g_tmpfs_ops

static

Initial value:

                             = {
    .lookup   = tmpfs_lookup,
    .read     = tmpfs_read,
    .readdir  = tmpfs_readdir,
    .write    = tmpfs_write,
    .flush    = tmpfs_flush,
    .create   = tmpfs_create,
    .unlink   = tmpfs_unlink,
    .rename   = tmpfs_rename,
    .mkdir    = tmpfs_mkdir,
    .rmdir    = tmpfs_rmdir,
    .set_root  = tmpfs_set_active_root,
    .truncate  = tmpfs_truncate,
    .readlink  = tmpfs_readlink,
    .symlink   = tmpfs_symlink,
    .mknod     = tmpfs_mknod,
    .chmod     = tmpfs_chmod,
    .statfs    = tmpfs_statfs,
}