subr_sglist.c File Reference

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/sglist.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <sys/ktr.h>

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Data Structures
struct	sgsave

Macros
#define	SGLIST_SAVE(sg, sgsave)
#define	SGLIST_RESTORE(sg, sgsave)

Functions
	__FBSDID ("$FreeBSD$")
static	MALLOC_DEFINE (M_SGLIST, "sglist", "scatter/gather lists")
static __inline int	_sglist_append_range (struct sglist *sg, struct sglist_seg **ssp, vm_paddr_t paddr, size_t len)
static __inline int	_sglist_append_buf (struct sglist *sg, void *buf, size_t len, pmap_t pmap, size_t *donep)
int	sglist_count (void *buf, size_t len)
int	sglist_count_vmpages (vm_page_t *m, size_t pgoff, size_t len)
int	sglist_count_mbuf_epg (struct mbuf *m, size_t off, size_t len)
struct sglist *	sglist_alloc (int nsegs, int mflags)
void	sglist_free (struct sglist *sg)
int	sglist_append (struct sglist *sg, void *buf, size_t len)
int	sglist_append_bio (struct sglist *sg, struct bio *bp)
int	sglist_append_phys (struct sglist *sg, vm_paddr_t paddr, size_t len)
int	sglist_append_mbuf_epg (struct sglist *sg, struct mbuf *m, size_t off, size_t len)
int	sglist_append_mbuf (struct sglist *sg, struct mbuf *m0)
int	sglist_append_single_mbuf (struct sglist *sg, struct mbuf *m)
int	sglist_append_vmpages (struct sglist *sg, vm_page_t *m, size_t pgoff, size_t len)
int	sglist_append_user (struct sglist *sg, void *buf, size_t len, struct thread *td)
int	sglist_append_sglist (struct sglist *sg, struct sglist *source, size_t offset, size_t length)
int	sglist_append_uio (struct sglist *sg, struct uio *uio)
int	sglist_consume_uio (struct sglist *sg, struct uio *uio, size_t resid)
struct sglist *	sglist_build (void *buf, size_t len, int mflags)
struct sglist *	sglist_clone (struct sglist *sg, int mflags)
size_t	sglist_length (struct sglist *sg)
int	sglist_split (struct sglist *original, struct sglist **head, size_t length, int mflags)
int	sglist_join (struct sglist *first, struct sglist *second)
int	sglist_slice (struct sglist *original, struct sglist **slice, size_t offset, size_t length, int mflags)

Macro Definition Documentation

SGLIST_RESTORE

#define SGLIST_RESTORE	(		sg,
			sgsave
	)

Value:

        do {                                    \
        (sg)->sg_nseg = (sgsave).sg_nseg;                               \
        if ((sgsave).sg_nseg > 0)                                       \
                (sg)->sg_segs[(sgsave).sg_nseg - 1].ss_len = (sgsave).ss_len; \
} while (0)

Definition at line 74 of file subr_sglist.c.

SGLIST_SAVE

#define SGLIST_SAVE	(		sg,
			sgsave
	)

Value:

        do {                                    \
        (sgsave).sg_nseg = (sg)->sg_nseg;                               \
        if ((sgsave).sg_nseg > 0)                                       \
                (sgsave).ss_len = (sg)->sg_segs[(sgsave).sg_nseg - 1].ss_len; \
        else                                                            \
                (sgsave).ss_len = 0;                                    \
} while (0)

Definition at line 66 of file subr_sglist.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

_sglist_append_buf()

static __inline int _sglist_append_buf ( struct sglist *  sg, void *  buf, size_t  len, pmap_t  pmap, size_t *  donep  )

static

Definition at line 111 of file subr_sglist.c.

References _sglist_append_range(), and buf.

Referenced by sglist_append(), sglist_append_uio(), sglist_append_user(), and sglist_consume_uio().

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_sglist_append_range()

static __inline int _sglist_append_range ( struct sglist *  sg, struct sglist_seg **  ssp, vm_paddr_t  paddr, size_t  len  )

static

Definition at line 86 of file subr_sglist.c.

Referenced by _sglist_append_buf(), sglist_append_phys(), sglist_append_sglist(), and sglist_append_vmpages().

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MALLOC_DEFINE()

static MALLOC_DEFINE ( M_SGLIST  , "sglist"  , "scatter/gather lists"    )

static

sglist_alloc()

struct sglist * sglist_alloc	(	int	nsegs,
		int	mflags
	)

Definition at line 284 of file subr_sglist.c.

References malloc().

Referenced by sglist_build(), sglist_clone(), sglist_slice(), and sglist_split().

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sglist_append()

int sglist_append	(	struct sglist *	sg,
		void *	buf,
		size_t	len
	)

Definition at line 316 of file subr_sglist.c.

References _sglist_append_buf(), buf, SGLIST_RESTORE, and SGLIST_SAVE.

Referenced by sglist_append_bio(), sglist_append_mbuf(), sglist_append_mbuf_epg(), sglist_append_single_mbuf(), and sglist_build().

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sglist_append_bio()

int sglist_append_bio	(	struct sglist *	sg,
		struct bio *	bp
	)

Definition at line 337 of file subr_sglist.c.

References sglist_append(), and sglist_append_vmpages().

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sglist_append_mbuf()

int sglist_append_mbuf	(	struct sglist *	sg,
		struct mbuf *	m0
	)

Definition at line 441 of file subr_sglist.c.

References sglist_append(), sglist_append_mbuf_epg(), SGLIST_RESTORE, and SGLIST_SAVE.

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sglist_append_mbuf_epg()

int sglist_append_mbuf_epg	(	struct sglist *	sg,
		struct mbuf *	m,
		size_t	off,
		size_t	len
	)

Definition at line 384 of file subr_sglist.c.

References sglist_append(), and sglist_append_phys().

Referenced by sglist_append_mbuf(), and sglist_append_single_mbuf().

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sglist_append_phys()

int sglist_append_phys	(	struct sglist *	sg,
		vm_paddr_t	paddr,
		size_t	len
	)

Definition at line 354 of file subr_sglist.c.

References _sglist_append_range(), SGLIST_RESTORE, SGLIST_SAVE, and sgsave::ss_len.

Referenced by sglist_append_mbuf_epg().

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sglist_append_sglist()

int sglist_append_sglist	(	struct sglist *	sg,
		struct sglist *	source,
		size_t	offset,
		size_t	length
	)

Definition at line 556 of file subr_sglist.c.

References _sglist_append_range(), SGLIST_RESTORE, and SGLIST_SAVE.

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sglist_append_single_mbuf()

int sglist_append_single_mbuf	(	struct sglist *	sg,
		struct mbuf *	m
	)

Definition at line 475 of file subr_sglist.c.

References sglist_append(), and sglist_append_mbuf_epg().

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sglist_append_uio()

int sglist_append_uio	(	struct sglist *	sg,
		struct uio *	uio
	)

Definition at line 599 of file subr_sglist.c.

References _sglist_append_buf(), SGLIST_RESTORE, and SGLIST_SAVE.

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sglist_append_user()

int sglist_append_user	(	struct sglist *	sg,
		void *	buf,
		size_t	len,
		struct thread *	td
	)

Definition at line 535 of file subr_sglist.c.

References _sglist_append_buf(), buf, SGLIST_RESTORE, and SGLIST_SAVE.

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sglist_append_vmpages()

int sglist_append_vmpages	(	struct sglist *	sg,
		vm_page_t *	m,
		size_t	pgoff,
		size_t	len
	)

Definition at line 490 of file subr_sglist.c.

References _sglist_append_range(), SGLIST_RESTORE, and SGLIST_SAVE.

Referenced by sglist_append_bio().

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sglist_build()

struct sglist * sglist_build	(	void *	buf,
		size_t	len,
		int	mflags
	)

Definition at line 697 of file subr_sglist.c.

References buf, sglist_alloc(), sglist_append(), sglist_count(), and sglist_free().

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sglist_clone()

struct sglist * sglist_clone	(	struct sglist *	sg,
		int	mflags
	)

Definition at line 720 of file subr_sglist.c.

References sglist_alloc().

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sglist_consume_uio()

int sglist_consume_uio	(	struct sglist *	sg,
		struct uio *	uio,
		size_t	resid
	)

Definition at line 647 of file subr_sglist.c.

References _sglist_append_buf().

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sglist_count()

int sglist_count	(	void *	buf,
		size_t	len
	)

Definition at line 172 of file subr_sglist.c.

References buf.

Referenced by sglist_build(), and sglist_count_mbuf_epg().

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sglist_count_mbuf_epg()

int sglist_count_mbuf_epg	(	struct mbuf *	m,
		size_t	off,
		size_t	len
	)

Definition at line 226 of file subr_sglist.c.

References sglist_count().

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sglist_count_vmpages()

int sglist_count_vmpages	(	vm_page_t *	m,
		size_t	pgoff,
		size_t	len
	)

Definition at line 201 of file subr_sglist.c.

sglist_free()

void sglist_free

(

struct sglist *

sg

)

Definition at line 300 of file subr_sglist.c.

References free().

Referenced by sglist_build().

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sglist_join()

int sglist_join	(	struct sglist *	first,
		struct sglist *	second
	)

Definition at line 847 of file subr_sglist.c.

sglist_length()

size_t sglist_length

(

struct sglist *

sg

)

Definition at line 740 of file subr_sglist.c.

sglist_slice()

int sglist_slice	(	struct sglist *	original,
		struct sglist **	slice,
		size_t	offset,
		size_t	length,
		int	mflags
	)

Definition at line 900 of file subr_sglist.c.

References count, and sglist_alloc().

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sglist_split()

int sglist_split	(	struct sglist *	original,
		struct sglist **	head,
		size_t	length,
		int	mflags
	)

Definition at line 769 of file subr_sglist.c.

References count, and sglist_alloc().

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