dnode.c File Reference

#include <sys/zfs_context.h>
#include <sys/dbuf.h>
#include <sys/dnode.h>
#include <sys/dmu.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_tx.h>
#include <sys/dmu_objset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_dataset.h>
#include <sys/spa.h>
#include <sys/zio.h>
#include <sys/dmu_zfetch.h>

Include dependency graph for dnode.c:

Go to the source code of this file.

Defines
#define	DNODE_STAT_ADD(stat)
	Define DNODE_STATS to turn on statistic gathering.
Functions
static int	free_range_compar (const void *node1, const void *node2)
static int	dnode_cons (void *arg, void *unused, int kmflag)
static void	dnode_dest (void *arg, void *unused)
void	dnode_init (void)
void	dnode_fini (void)
void	dnode_byteswap (dnode_phys_t *dnp)
void	dnode_buf_byteswap (void *vbuf, size_t size)
void	dnode_setbonuslen (dnode_t *dn, int newsize, dmu_tx_t *tx)
void	dnode_setbonus_type (dnode_t *dn, dmu_object_type_t newtype, dmu_tx_t *tx)
void	dnode_rm_spill (dnode_t *dn, dmu_tx_t *tx)
static void	dnode_setdblksz (dnode_t *dn, int size)
static dnode_t *	dnode_create (objset_t *os, dnode_phys_t *dnp, dmu_buf_impl_t *db, uint64_t object, dnode_handle_t *dnh)
static void	dnode_destroy (dnode_t *dn)
	Caller must be holding the dnode handle, which is released upon return.
void	dnode_allocate (dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
void	dnode_reallocate (dnode_t *dn, dmu_object_type_t ot, int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
static void	dnode_move_impl (dnode_t *odn, dnode_t *ndn)
void	dnode_special_close (dnode_handle_t *dnh)
dnode_t *	dnode_special_open (objset_t *os, dnode_phys_t *dnp, uint64_t object, dnode_handle_t *dnh)
static void	dnode_buf_pageout (dmu_buf_t *db, void *arg)
int	dnode_hold_impl (objset_t *os, uint64_t object, int flag, void *tag, dnode_t **dnp)
	Succeeds even for free dnodes.
int	dnode_hold (objset_t *os, uint64_t object, void *tag, dnode_t **dnp)
boolean_t	dnode_add_ref (dnode_t *dn, void *tag)
	Can only add a reference if there is already at least one reference on the dnode.
void	dnode_rele (dnode_t *dn, void *tag)
void	dnode_setdirty (dnode_t *dn, dmu_tx_t *tx)
void	dnode_free (dnode_t *dn, dmu_tx_t *tx)
int	dnode_set_blksz (dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx)
	Try to change the block size for the indicated dnode.
void	dnode_new_blkid (dnode_t *dn, uint64_t blkid, dmu_tx_t *tx, boolean_t have_read)
	read-holding callers must not rely on the lock being continuously held
void	dnode_clear_range (dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx)
void	dnode_free_range (dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx)
static boolean_t	dnode_spill_freed (dnode_t *dn)
uint64_t	dnode_block_freed (dnode_t *dn, uint64_t blkid)
void	dnode_diduse_space (dnode_t *dn, int64_t delta)
	call from syncing context when we actually write/free space for this dnode
void	dnode_willuse_space (dnode_t *dn, int64_t space, dmu_tx_t *tx)
	Call when we think we're going to write/free space in open context.
static int	dnode_next_offset_level (dnode_t *dn, int flags, uint64_t *offset, int lvl, uint64_t blkfill, uint64_t txg)
	Scans a block at the indicated "level" looking for a hole or data (depending on 'flags').
int	dnode_next_offset (dnode_t *dn, int flags, uint64_t *offset, int minlvl, uint64_t blkfill, uint64_t txg)
	Find the next hole, data, or sparse region at or after *offset.
Variables
static kmem_cache_t *	dnode_cache
static dnode_phys_t	dnode_phys_zero
int	zfs_default_bs = SPA_MINBLOCKSHIFT
int	zfs_default_ibs = DN_MAX_INDBLKSHIFT

---

Define Documentation

#define DNODE_STAT_ADD

(

stat

)

Define DNODE_STATS to turn on statistic gathering.

By default, it is only turned on when DEBUG is also defined.

Definition at line 53 of file dnode.c.

---

Function Documentation

boolean_t dnode_add_ref	(	dnode_t *	dn,
		void *	tag
	)

Can only add a reference if there is already at least one reference on the dnode.

Returns:

FALSE if unable to add a new reference, TRUE otherwise

Definition at line 1160 of file dnode.c.

void dnode_allocate	(	dnode_t *	dn,
		dmu_object_type_t	ot,
		int	blocksize,
		int	ibs,
		dmu_object_type_t	bonustype,
		int	bonuslen,
		dmu_tx_t *	tx
	)

Definition at line 481 of file dnode.c.

uint64_t dnode_block_freed	(	dnode_t *	dn,
		uint64_t	blkid
	)

Return values:

TRUE	This blkid was freed in a recent txg
FALSE	This blkid was not freed in a recent txg

Definition at line 1721 of file dnode.c.

void dnode_buf_byteswap	(	void *	vbuf,
		size_t	size
	)

Definition at line 298 of file dnode.c.

static void dnode_buf_pageout	(	dmu_buf_t *	db,
		void *	arg
	)		[static]

Definition at line 961 of file dnode.c.

void dnode_byteswap

(

dnode_phys_t *

dnp

)

Definition at line 246 of file dnode.c.

void dnode_clear_range	(	dnode_t *	dn,
		uint64_t	blkid,
		uint64_t	nblks,
		dmu_tx_t *	tx
	)

Definition at line 1464 of file dnode.c.

static int dnode_cons	(	void *	arg,
		void *	unused,
		int	kmflag
	)		[static]

Definition at line 67 of file dnode.c.

static dnode_t* dnode_create	(	objset_t *	os,
		dnode_phys_t *	dnp,
		dmu_buf_impl_t *	db,
		uint64_t	object,
		dnode_handle_t *	dnh
	)		[static]

Definition at line 378 of file dnode.c.

static void dnode_dest	(	void *	arg,
		void *	unused
	)		[static]

Definition at line 126 of file dnode.c.

static void dnode_destroy

(

dnode_t *

dn

)

[static]

Caller must be holding the dnode handle, which is released upon return.

Definition at line 436 of file dnode.c.

void dnode_diduse_space	(	dnode_t *	dn,
		int64_t	delta
	)

call from syncing context when we actually write/free space for this dnode

Definition at line 1767 of file dnode.c.

void dnode_fini

(

void

)

Definition at line 183 of file dnode.c.

void dnode_free	(	dnode_t *	dn,
		dmu_tx_t *	tx
	)

Definition at line 1278 of file dnode.c.

void dnode_free_range	(	dnode_t *	dn,
		uint64_t	off,
		uint64_t	len,
		dmu_tx_t *	tx
	)

Definition at line 1517 of file dnode.c.

int dnode_hold	(	objset_t *	os,
		uint64_t	object,
		void *	tag,
		dnode_t **	dnp
	)

Returns:

held dnode if the object is allocated, NULL if not.

Definition at line 1148 of file dnode.c.

int dnode_hold_impl	(	objset_t *	os,
		uint64_t	object,
		int	flag,
		void *	tag,
		dnode_t **	dnp
	)

Succeeds even for free dnodes.

Return values:

0	Success
EINVAL	invalid object number
EIO	I/O error
other	Other errors

Definition at line 1011 of file dnode.c.

void dnode_init

(

void

)

Definition at line 173 of file dnode.c.

static void dnode_move_impl	(	dnode_t *	odn,
		dnode_t *	ndn
	)		[static]

Definition at line 648 of file dnode.c.

void dnode_new_blkid	(	dnode_t *	dn,
		uint64_t	blkid,
		dmu_tx_t *	tx,
		boolean_t	have_read
	)

read-holding callers must not rely on the lock being continuously held

Definition at line 1382 of file dnode.c.

int dnode_next_offset	(	dnode_t *	dn,
		int	flags,
		uint64_t *	offset,
		int	minlvl,
		uint64_t	blkfill,
		uint64_t	txg
	)

Find the next hole, data, or sparse region at or after *offset.

The value 'blkfill' tells us how many items we expect to find in an L0 data block; this value is 1 for normal objects, DNODES_PER_BLOCK for the meta dnode, and some fraction of DNODES_PER_BLOCK when searching for sparse regions thereof.

Examples:

dnode_next_offset(dn, flags, offset, 1, 1, 0); Finds the next/previous hole/data in a file. Used in dmu_offset_next().

dnode_next_offset(mdn, flags, offset, 0, DNODES_PER_BLOCK, txg); Finds the next free/allocated dnode an objset's meta-dnode. Only finds objects that have new contents since txg (ie. bonus buffer changes and content removal are ignored). Used in dmu_object_next().

dnode_next_offset(mdn, DNODE_FIND_HOLE, offset, 2, DNODES_PER_BLOCK >> 2, 0); Finds the next L2 meta-dnode bp that's at most 1/4 full. Used in dmu_object_alloc().

Definition at line 1963 of file dnode.c.

static int dnode_next_offset_level	(	dnode_t *	dn,
		int	flags,
		uint64_t *	offset,
		int	lvl,
		uint64_t	blkfill,
		uint64_t	txg
	)		[static]

Scans a block at the indicated "level" looking for a hole or data (depending on 'flags').

If level > 0, then we are scanning an indirect block looking at its pointers. If level == 0, then we are looking at a block of dnodes. If we don't find what we are looking for in the block, we return ESRCH. Otherwise, return with *offset pointing to the beginning (if searching forwards) or end (if searching backwards) of the range covered by the block pointer we matched on (or dnode).

The basic search algorithm used below by dnode_next_offset() is to use this function to search up the block tree (widen the search) until we find something (i.e., we don't return ESRCH) and then search back down the tree (narrow the search) until we reach our original search level.

Definition at line 1832 of file dnode.c.

void dnode_reallocate	(	dnode_t *	dn,
		dmu_object_type_t	ot,
		int	blocksize,
		dmu_object_type_t	bonustype,
		int	bonuslen,
		dmu_tx_t *	tx
	)

Definition at line 564 of file dnode.c.

void dnode_rele	(	dnode_t *	dn,
		void *	tag
	)

Definition at line 1173 of file dnode.c.

void dnode_rm_spill	(	dnode_t *	dn,
		dmu_tx_t *	tx
	)

Definition at line 355 of file dnode.c.

int dnode_set_blksz	(	dnode_t *	dn,
		uint64_t	size,
		int	ibs,
		dmu_tx_t *	tx
	)

Try to change the block size for the indicated dnode.

This can only succeed if there are no blocks allocated or dirty beyond first block

Definition at line 1315 of file dnode.c.

void dnode_setbonus_type	(	dnode_t *	dn,
		dmu_object_type_t	newtype,
		dmu_tx_t *	tx
	)

Definition at line 344 of file dnode.c.

void dnode_setbonuslen	(	dnode_t *	dn,
		int	newsize,
		dmu_tx_t *	tx
	)

Definition at line 327 of file dnode.c.

static void dnode_setdblksz	(	dnode_t *	dn,
		int	size
	)		[static]

Definition at line 365 of file dnode.c.

void dnode_setdirty	(	dnode_t *	dn,
		dmu_tx_t *	tx
	)

Definition at line 1210 of file dnode.c.

void dnode_special_close

(

dnode_handle_t *

dnh

)

Definition at line 931 of file dnode.c.

dnode_t* dnode_special_open	(	objset_t *	os,
		dnode_phys_t *	dnp,
		uint64_t	object,
		dnode_handle_t *	dnh
	)

Definition at line 950 of file dnode.c.

static boolean_t dnode_spill_freed

(

dnode_t *

dn

)

[static]

Definition at line 1703 of file dnode.c.

void dnode_willuse_space	(	dnode_t *	dn,
		int64_t	space,
		dmu_tx_t *	tx
	)

Call when we think we're going to write/free space in open context.

Be conservative (ie. OK to write less than this or free more than this, but don't write more or free less).

Definition at line 1800 of file dnode.c.

static int free_range_compar	(	const void *	node1,
		const void *	node2
	)		[static]

Definition at line 314 of file dnode.c.

---

Variable Documentation

kmem_cache_t* dnode_cache [static]

Definition at line 41 of file dnode.c.

dnode_phys_t dnode_phys_zero [static]

Definition at line 56 of file dnode.c.

int zfs_default_bs = SPA_MINBLOCKSHIFT

Definition at line 58 of file dnode.c.

int zfs_default_ibs = DN_MAX_INDBLKSHIFT

Definition at line 59 of file dnode.c.