Virtual device descriptors. More...

#include <sys/avl.h>
#include <sys/dmu.h>
#include <sys/metaslab.h>
#include <sys/nvpair.h>
#include <sys/space_map.h>
#include <sys/vdev.h>
#include <sys/dkio.h>
#include <sys/uberblock_impl.h>
#include <sys/metaslab.h>
#include <sys/uberblock_impl.h>

Include dependency graph for vdev_impl.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	vdev_ops
struct	vdev_cache_entry
struct	vdev_cache
struct	vdev_queue
	A virtual device property. More...
struct	vdev
	Virtual device descriptor. More...
struct	vdev_phys
struct	vdev_label
Defines
#define	VDEV_RAIDZ_MAXPARITY 3
#define	VDEV_PAD_SIZE (8 << 10)
#define	VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
	2 padding areas (vl_pad1 and vl_pad2) to skip
#define	VDEV_PHYS_SIZE (112 << 10)
#define	VDEV_UBERBLOCK_RING (128 << 10)
#define	VDEV_UBERBLOCK_SHIFT(vd) MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)
#define	VDEV_UBERBLOCK_COUNT(vd) (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
#define	VDEV_UBERBLOCK_OFFSET(vd, n) offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
#define	VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
#define	VDD_METASLAB 0x01
	vdev_dirty() flags
#define	VDD_DTL 0x02
#define	VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
	Offset of embedded boot loader region on each label.
#define	VDEV_BOOT_SIZE (7ULL << 19)
	Size of embedded boot loader region on each label.
#define	VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
#define	VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
#define	VDEV_LABELS 4
#define	VDEV_BEST_LABEL VDEV_LABELS
#define	VDEV_ALLOC_LOAD 0
#define	VDEV_ALLOC_ADD 1
#define	VDEV_ALLOC_SPARE 2
#define	VDEV_ALLOC_L2CACHE 3
#define	VDEV_ALLOC_ROOTPOOL 4
#define	VDEV_ALLOC_SPLIT 5
#define	VDEV_ALLOC_ATTACH 6
Typedefs
typedef struct vdev_queue	vdev_queue_t
typedef struct vdev_cache	vdev_cache_t
typedef struct vdev_cache_entry	vdev_cache_entry_t
typedef struct vdev_ops	vdev_ops_t
typedef struct vdev_phys	vdev_phys_t
typedef struct vdev_label	vdev_label_t
VDev Operation types
typedefs used only for vdev_ops table
typedef int	vdev_open_func_t (vdev_t vd, uint64_t size, uint64_t max_size, uint64_t ashift)
typedef void	vdev_close_func_t (vdev_t *vd)
typedef uint64_t	vdev_asize_func_t (vdev_t *vd, uint64_t psize)
typedef int	vdev_io_start_func_t (zio_t *zio)
typedef void	vdev_io_done_func_t (zio_t *zio)
typedef void	vdev_state_change_func_t (vdev_t *vd, int, int)
typedef void	vdev_hold_func_t (vdev_t *vd)
typedef void	vdev_rele_func_t (vdev_t *vd)
Functions
vdev_t *	vdev_alloc_common (spa_t spa, uint_t id, uint64_t guid, vdev_ops_t ops)
	Allocate and minimally initialize a vdev_t.
int	vdev_alloc (spa_t spa, vdev_t vdp, nvlist_t config, vdev_t *parent, uint_t id, int alloctype)
	Allocate a new vdev.
void	vdev_free (vdev_t *vd)
void	vdev_add_child (vdev_t pvd, vdev_t cvd)
void	vdev_remove_child (vdev_t pvd, vdev_t cvd)
void	vdev_compact_children (vdev_t *pvd)
	Remove any holes in the child array.
vdev_t *	vdev_add_parent (vdev_t cvd, vdev_ops_t ops)
	Add a mirror/replacing vdev above an existing vdev.
void	vdev_remove_parent (vdev_t *cvd)
	Remove a 1-way mirror/replacing vdev from the tree.
void	vdev_load_log_state (vdev_t nvd, vdev_t ovd)
	Load the state from the original vdev tree (ovd) which we've retrieved from the MOS config object.
boolean_t	vdev_log_state_valid (vdev_t *vd)
	Determine if a log device has valid content.
void	vdev_load (vdev_t *vd)
void	vdev_sync (vdev_t *vd, uint64_t txg)
void	vdev_sync_done (vdev_t *vd, uint64_t txg)
void	vdev_dirty (vdev_t vd, int flags, void arg, uint64_t txg)
uint64_t	vdev_default_asize (vdev_t *vd, uint64_t psize)
	Default asize function.
uint64_t	vdev_get_min_asize (vdev_t *vd)
	Get the minimum allocatable size.
void	vdev_set_min_asize (vdev_t *vd)
Variables
vdev_ops_t	vdev_root_ops
vdev_ops_t	vdev_mirror_ops
vdev_ops_t	vdev_replacing_ops
vdev_ops_t	vdev_raidz_ops
vdev_ops_t	vdev_geom_ops
	Vector table for the vdev_geom module.
vdev_ops_t	vdev_file_ops
vdev_ops_t	vdev_missing_ops
vdev_ops_t	vdev_hole_ops
vdev_ops_t	vdev_spare_ops
int	zfs_vdev_cache_size

Detailed Description

Virtual device descriptors.

All storage pool operations go through the virtual device framework, which provides data replication and I/O scheduling.

Definition in file vdev_impl.h.

Define Documentation

#define VDD_DTL 0x02

Definition at line 267 of file vdev_impl.h.

#define VDD_METASLAB 0x01

vdev_dirty() flags

Definition at line 266 of file vdev_impl.h.

#define VDEV_ALLOC_ADD 1

Definition at line 286 of file vdev_impl.h.

#define VDEV_ALLOC_ATTACH 6

Definition at line 291 of file vdev_impl.h.

#define VDEV_ALLOC_L2CACHE 3

Definition at line 288 of file vdev_impl.h.

#define VDEV_ALLOC_LOAD 0

Definition at line 285 of file vdev_impl.h.

#define VDEV_ALLOC_ROOTPOOL 4

Definition at line 289 of file vdev_impl.h.

#define VDEV_ALLOC_SPARE 2

Definition at line 287 of file vdev_impl.h.

#define VDEV_ALLOC_SPLIT 5

Definition at line 290 of file vdev_impl.h.

#define VDEV_BEST_LABEL VDEV_LABELS

Definition at line 283 of file vdev_impl.h.

#define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))

Offset of embedded boot loader region on each label.

Definition at line 270 of file vdev_impl.h.

#define VDEV_BOOT_SIZE (7ULL << 19)

Size of embedded boot loader region on each label.

The total size of the first two labels plus the boot area is 4MB.

Definition at line 275 of file vdev_impl.h.

#define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))

Definition at line 281 of file vdev_impl.h.

#define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)

Definition at line 280 of file vdev_impl.h.

#define VDEV_LABELS 4

Definition at line 282 of file vdev_impl.h.

#define VDEV_PAD_SIZE (8 << 10)

Definition at line 236 of file vdev_impl.h.

#define VDEV_PHYS_SIZE (112 << 10)

Definition at line 239 of file vdev_impl.h.

#define VDEV_RAIDZ_MAXPARITY 3

Definition at line 234 of file vdev_impl.h.

#define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2

2 padding areas (vl_pad1 and vl_pad2) to skip

Definition at line 238 of file vdev_impl.h.

#define VDEV_UBERBLOCK_COUNT ( vd ) (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))

Definition at line 244 of file vdev_impl.h.

#define VDEV_UBERBLOCK_OFFSET	(	vd,
		n
	)	offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])

Definition at line 246 of file vdev_impl.h.

#define VDEV_UBERBLOCK_RING (128 << 10)

Definition at line 240 of file vdev_impl.h.

#define VDEV_UBERBLOCK_SHIFT ( vd ) MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)

Definition at line 242 of file vdev_impl.h.

#define VDEV_UBERBLOCK_SIZE ( vd ) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))

Definition at line 248 of file vdev_impl.h.

Typedef Documentation

typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize)

Definition at line 65 of file vdev_impl.h.

typedef struct vdev_cache_entry vdev_cache_entry_t

Definition at line 55 of file vdev_impl.h.

typedef struct vdev_cache vdev_cache_t

Definition at line 54 of file vdev_impl.h.

typedef void vdev_close_func_t(vdev_t *vd)

Definition at line 64 of file vdev_impl.h.

typedef void vdev_hold_func_t(vdev_t *vd)

Definition at line 69 of file vdev_impl.h.

typedef void vdev_io_done_func_t(zio_t *zio)

Definition at line 67 of file vdev_impl.h.

typedef int vdev_io_start_func_t(zio_t *zio)

Definition at line 66 of file vdev_impl.h.

typedef struct vdev_label vdev_label_t

Note:: 256K total size

typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, uint64_t *ashift)

Definition at line 62 of file vdev_impl.h.

typedef struct vdev_ops vdev_ops_t

typedef struct vdev_phys vdev_phys_t

typedef struct vdev_queue vdev_queue_t

Definition at line 53 of file vdev_impl.h.

typedef void vdev_rele_func_t(vdev_t *vd)

Definition at line 70 of file vdev_impl.h.

typedef void vdev_state_change_func_t(vdev_t *vd, int, int)

Definition at line 68 of file vdev_impl.h.

Function Documentation

void vdev_add_child	(	vdev_t *	pvd,
		vdev_t *	cvd
	)

Definition at line 183 of file vdev.c.

vdev_t* vdev_add_parent	(	vdev_t *	cvd,
		vdev_ops_t *	ops
	)

Add a mirror/replacing vdev above an existing vdev.

Definition at line 736 of file vdev.c.

int vdev_alloc	(	spa_t *	spa,
		vdev_t **	vdp,
		nvlist_t *	nv,
		vdev_t *	parent,
		uint_t	id,
		int	alloctype
	)

Allocate a new vdev.

The 'alloctype' is used to control whether we are creating a new vdev or loading an existing one - the behavior is slightly different for each case.

Definition at line 350 of file vdev.c.

vdev_t* vdev_alloc_common	(	spa_t *	spa,
		uint_t	id,
		uint64_t	guid,
		vdev_ops_t *	ops
	)

Allocate and minimally initialize a vdev_t.

Definition at line 290 of file vdev.c.

void vdev_compact_children ( vdev_t * pvd )

Remove any holes in the child array.

Definition at line 260 of file vdev.c.

uint64_t vdev_default_asize	(	vdev_t *	vd,
		uint64_t	psize
	)

Default asize function.

Return the MAX of psize with the asize of all children. This is what's used by anything other than RAID-Z.

Definition at line 94 of file vdev.c.

void vdev_dirty	(	vdev_t *	vd,
		int	flags,
		void *	arg,
		uint64_t	txg
	)

Definition at line 1579 of file vdev.c.

void vdev_free ( vdev_t * vd )

Definition at line 573 of file vdev.c.

uint64_t vdev_get_min_asize ( vdev_t * vd )

Get the minimum allocatable size.

We define the allocatable size as the vdev's asize rounded to the nearest metaslab. This allows us to replace or attach devices which don't have the same physical size but can still satisfy the same number of allocations.

Definition at line 114 of file vdev.c.

void vdev_load ( vdev_t * vd )

Definition at line 1947 of file vdev.c.