dentry.c File Reference

ext2: directory entries. More...

#include <ext2.h>

Go to the source code of this file.

Functions
int	ext2_dentry_find (struct ext2 *desc, struct ext2_inode *inode, const char *name, ino_t *ino)
	Finds the inode number of a name in a directory.
static uint8_t	ext2_dentry_type (mode_t mode)
	Returns the directory entry type of a file's mode.
int	ext2_dentry_create (struct vnode *dir, const char *name, ino_t ino, mode_t mode)
	Adds an entry to a directory.

Detailed Description

ext2: directory entries.

A directory's blocks hold entries of different sizes, each saying where the next one is (its size); an entry with no inode is unused, and a new entry takes an unused one, the room left at the end of another, or a new block.

Definition in file dentry.c.

Function Documentation

ext2_dentry_create()

int ext2_dentry_create	(	struct vnode *	dir,
		const char *	name,
		ino_t	ino,
		mode_t	mode )

Adds an entry to a directory.

It takes an unused entry big enough, or splits an entry that has room after its name, or else gets a new block at the end of the directory.

Parameters

dir	the directory
name	the new entry's name
ino	its inode number
mode	its file's mode (for the entry's type)

Returns

0, -ENOTDIR, -ENOMEM, or an I/O error

Definition at line 87 of file dentry.c.

References ext2::bs, ext2_dentry_create(), ext2_dentry_type(), ext2_inode_block_read(), ext2_inode_block_write(), ext2_inode_read(), ext2_inode_write(), ext2::filetype, ext2_dentry::ino, vnode::ino, kfree(), kmalloc(), ext2_dentry::length, memcpy(), memset(), vnode::mode, ext2_dentry::name, NULL, vnode::p, ext2_dentry::size, ext2_inode::size, vnode::size, and ext2_dentry::type.

Referenced by ext2_dentry_create(), ext2_vlink(), ext2_vmknod(), and ext2_vrename().

ext2_dentry_find()

int ext2_dentry_find	(	struct ext2 *	desc,
		struct ext2_inode *	inode,
		const char *	name,
		ino_t *	ino )

Finds the inode number of a name in a directory.

Parameters

desc	the mounted filesystem
inode	the directory's inode
name	the name
ino	set to the inode number

Returns

0, -ENOENT if there's no such name, -ENOTDIR, -ENOMEM, or an I/O error

Definition at line 20 of file dentry.c.

References ext2::bs, ext2_dentry_find(), ext2_inode_block_read(), ext2_dentry::ino, kfree(), kmalloc(), ext2_dentry::length, memcmp(), ext2_inode::mode, ext2_dentry::name, ext2_dentry::size, and ext2_inode::size.

Referenced by ext2_dentry_find(), ext2_finddir(), ext2_vlink(), ext2_vmknod(), and ext2_vrename().

ext2_dentry_type()

uint8_t ext2_dentry_type ( mode_t mode )

inlinestatic

Returns the directory entry type of a file's mode.

Definition at line 62 of file dentry.c.

References ext2_dentry_type(), EXT2_DENTRY_TYPE_BAD, EXT2_DENTRY_TYPE_BLK, EXT2_DENTRY_TYPE_CHR, EXT2_DENTRY_TYPE_DIR, EXT2_DENTRY_TYPE_FIFO, EXT2_DENTRY_TYPE_RGL, EXT2_DENTRY_TYPE_SCKT, and EXT2_DENTRY_TYPE_SLINK.

Referenced by ext2_dentry_create(), and ext2_dentry_type().