Mount

Mount point. More...

Collaboration diagram for Mount:

Detailed Description

Mount point.

A mount represents a location that a superblock is mounted to. It links a superblock (the mounted filesystem) to a mountpoint (a dentry in another filesystem).

Data Structures
struct	mount_t
	Mount structure. More...

Macros
#define	MOUNT_IS_ROOT(mount)   ((mount)->parent == (mount))
	Macro to check if a mount is the root filesystem.

Typedefs
typedef uint64_t	mount_id_t
	Mount ID type.

Functions
mount_t *	mount_new (superblock_t *superblock, dentry_t *source, dentry_t *target, mount_t *parent, mode_t mode)
	Create a new mount.

Macro Definition Documentation

MOUNT_IS_ROOT

#define MOUNT_IS_ROOT

(

mount

)

((mount)->parent == (mount))

Macro to check if a mount is the root filesystem.

Definition at line 35 of file mount.h.

Typedef Documentation

mount_id_t

typedef uint64_t mount_id_t

Mount ID type.

Definition at line 30 of file mount.h.

Function Documentation

mount_new()

mount_t * mount_new	(	superblock_t *	superblock,
		dentry_t *	source,
		dentry_t *	target,
		mount_t *	parent,
		mode_t	mode
	)

Create a new mount.

This does not add the mount to the mount cache, that must be done separately with vfs_add_mount().

There is no mount_free() instead use UNREF().

Parameters

superblock	The superblock of the mounted filesystem.
source	The dentry to appear at target once mounted, usually the root dentry of the mounted filesystem.
target	The dentry which the source is mounted to, can be NULL for the root filesystem.
parent	The parent mount, can be NULL for the root filesystem.
mode	Specifies the maximum permissions for this mount and if it is a directory or a file.

Returns

On success, the new mount. On failure, returns NULL and errno is set to:

• EINVAL: Invalid parameters.
• ENOENT: Source or target dentry is negative.
• ENOTDIR: Source is a file but mode specifies a directory.
• EISDIR: Source is a directory but mode specifies a file.
• ENOMEM: Out of memory.

Definition at line 39 of file mount.c.

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