uipc_shm.c File Reference

#include <sys/cdefs.h>
#include "opt_capsicum.h"
#include "opt_ktrace.h"
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/filio.h>
#include <sys/fnv_hash.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/uio.h>
#include <sys/signal.h>
#include <sys/jail.h>
#include <sys/ktrace.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/refcount.h>
#include <sys/resourcevar.h>
#include <sys/rwlock.h>
#include <sys/sbuf.h>
#include <sys/stat.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/sx.h>
#include <sys/time.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>
#include <sys/unistd.h>
#include <sys/user.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>
#include <vm/swap_pager.h>

Go to the source code of this file.

Data Structures
struct	shm_mapping

Macros
#define	SHM_HASH(fnv)   (&shm_dictionary[(fnv) & shm_hash])
#define	M   (1024 * 1024)
#define	G   (1024 * M)

Functions
	__FBSDID ("$FreeBSD$")
static	MALLOC_DEFINE (M_SHMFD, "shmfd", "shared memory file descriptor")
static	LIST_HEAD (shm_mapping)
	FEATURE (posix_shm, "POSIX shared memory")
static	SYSCTL_NODE (_vm, OID_AUTO, largepages, CTLFLAG_RD|CTLFLAG_MPSAFE, 0, "")
	SYSCTL_INT (_vm_largepages, OID_AUTO, reclaim_tries, CTLFLAG_RWTUN, &largepage_reclaim_tries, 0, "Number of contig reclaims before giving up for default alloc policy")
static int	uiomove_object_page (vm_object_t obj, size_t len, struct uio *uio)
int	uiomove_object (vm_object_t obj, off_t obj_size, struct uio *uio)
static int	shm_largepage_phys_populate (vm_object_t object, vm_pindex_t pidx, int fault_type, vm_prot_t max_prot, vm_pindex_t *first, vm_pindex_t *last)
static boolean_t	shm_largepage_phys_haspage (vm_object_t object, vm_pindex_t pindex, int *before, int *after)
static void	shm_largepage_phys_ctor (vm_object_t object, vm_prot_t prot, vm_ooffset_t foff, struct ucred *cred)
static void	shm_largepage_phys_dtor (vm_object_t object)
bool	shm_largepage (struct shmfd *shmfd)
static int	shm_seek (struct file *fp, off_t offset, int whence, struct thread *td)
static int	shm_read (struct file *fp, struct uio *uio, struct ucred *active_cred, int flags, struct thread *td)
static int	shm_write (struct file *fp, struct uio *uio, struct ucred *active_cred, int flags, struct thread *td)
static int	shm_truncate (struct file *fp, off_t length, struct ucred *active_cred, struct thread *td)
int	shm_ioctl (struct file *fp, u_long com, void *data, struct ucred *active_cred, struct thread *td)
static int	shm_stat (struct file *fp, struct stat *sb, struct ucred *active_cred)
static int	shm_close (struct file *fp, struct thread *td)
static int	shm_copyin_path (struct thread *td, const char *userpath_in, char **path_out)
static int	shm_partial_page_invalidate (vm_object_t object, vm_pindex_t idx, int base, int end)
static int	shm_dotruncate_locked (struct shmfd *shmfd, off_t length, void *rl_cookie)
static int	shm_dotruncate_largepage (struct shmfd *shmfd, off_t length, void *rl_cookie)
static int	shm_dotruncate_cookie (struct shmfd *shmfd, off_t length, void *rl_cookie)
int	shm_dotruncate (struct shmfd *shmfd, off_t length)
struct shmfd *	shm_alloc (struct ucred *ucred, mode_t mode, bool largepage)
struct shmfd *	shm_hold (struct shmfd *shmfd)
void	shm_drop (struct shmfd *shmfd)
int	shm_access (struct shmfd *shmfd, struct ucred *ucred, int flags)
static void	shm_init (void *arg)
	SYSINIT (shm_init, SI_SUB_SYSV_SHM, SI_ORDER_ANY, shm_init, NULL)
static struct shmfd *	shm_lookup (char *path, Fnv32_t fnv)
static void	shm_insert (char *path, Fnv32_t fnv, struct shmfd *shmfd)
static int	shm_remove (char *path, Fnv32_t fnv, struct ucred *ucred)
int	kern_shm_open2 (struct thread *td, const char *userpath, int flags, mode_t mode, int shmflags, struct filecaps *fcaps, const char *name __unused)
int	sys_shm_unlink (struct thread *td, struct shm_unlink_args *uap)
int	sys_shm_rename (struct thread *td, struct shm_rename_args *uap)
static int	shm_mmap_large (struct shmfd *shmfd, vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, vm_prot_t max_prot, int flags, vm_ooffset_t foff, struct thread *td)
static int	shm_mmap (struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t objsize, vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, struct thread *td)
static int	shm_chmod (struct file *fp, mode_t mode, struct ucred *active_cred, struct thread *td)
static int	shm_chown (struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, struct thread *td)
int	shm_map (struct file *fp, size_t size, off_t offset, void **memp)
int	shm_unmap (struct file *fp, void *mem, size_t size)
static int	shm_fill_kinfo_locked (struct shmfd *shmfd, struct kinfo_file *kif, bool list)
static int	shm_fill_kinfo (struct file *fp, struct kinfo_file *kif, struct filedesc *fdp __unused)
static int	shm_add_seals (struct file *fp, int seals)
static int	shm_get_seals (struct file *fp, int *seals)
static int	shm_deallocate (struct shmfd *shmfd, off_t *offset, off_t *length, int flags)
static int	shm_fspacectl (struct file *fp, int cmd, off_t *offset, off_t *length, int flags, struct ucred *active_cred, struct thread *td)
static int	shm_fallocate (struct file *fp, off_t offset, off_t len, struct thread *td)
static int	sysctl_posix_shm_list (SYSCTL_HANDLER_ARGS)
	SYSCTL_PROC (_kern_ipc, OID_AUTO, posix_shm_list, CTLFLAG_RD|CTLFLAG_PRISON|CTLFLAG_MPSAFE|CTLTYPE_OPAQUE, NULL, 0, sysctl_posix_shm_list, "", "POSIX SHM list")
int	kern_shm_open (struct thread *td, const char *path, int flags, mode_t mode, struct filecaps *caps)
int	sys_shm_open2 (struct thread *td, struct shm_open2_args *uap)

Variables
static int	largepage_reclaim_tries = 1
static u_long	count_largepages [MAXPAGESIZES]
static const struct phys_pager_ops	shm_largepage_phys_ops

Macro Definition Documentation

G

#define G   (1024 * M)

M

#define M   (1024 * 1024)

SHM_HASH

#define SHM_HASH

(

fnv

)

(&shm_dictionary[(fnv) & shm_hash])

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

FEATURE()

FEATURE	(	posix_shm	,
		"POSIX shared memory"
	)

kern_shm_open()

int kern_shm_open	(	struct thread *	td,
		const char *	path,
		int	flags,
		mode_t	mode,
		struct filecaps *	caps
	)

Definition at line 2071 of file uipc_shm.c.

References flags, kern_shm_open2(), mode, and path.

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kern_shm_open2()

int kern_shm_open2	(	struct thread *	td,
		const char *	userpath,
		int	flags,
		mode_t	mode,
		int	shmflags,
		struct filecaps *	fcaps,
		const char *name	__unused
	)

Definition at line 1050 of file uipc_shm.c.

References falloc_caps(), fd, fdclose(), finit(), flags, free(), mode, path, rangelock_unlock(), rangelock_wlock(), shm_access(), shm_alloc(), shm_copyin_path(), shm_dotruncate_locked(), shm_hold(), shm_insert(), and shm_lookup().

Referenced by kern_shm_open(), and sys_shm_open2().

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LIST_HEAD()

static LIST_HEAD ( shm_mapping  )

static

Definition at line 115 of file uipc_shm.c.

MALLOC_DEFINE()

static MALLOC_DEFINE ( M_SHMFD  , "shmfd"  , "shared memory file descriptor"    )

static

shm_access()

int shm_access	(	struct shmfd *	shmfd,
		struct ucred *	ucred,
		int	flags
	)

Definition at line 935 of file uipc_shm.c.

References accmode, flags, and vaccess().

Referenced by kern_shm_open2(), shm_remove(), and umtx_shm().

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shm_add_seals()

static int shm_add_seals ( struct file *  fp, int  seals  )

static

Definition at line 1841 of file uipc_shm.c.

References rangelock_unlock(), rangelock_wlock(), and shm_largepage().

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shm_alloc()

struct shmfd * shm_alloc	(	struct ucred *	ucred,
		mode_t	mode,
		bool	largepage
	)

Definition at line 873 of file uipc_shm.c.

References malloc(), mode, rangelock_init(), shm_largepage_phys_ops, and vfs_timestamp().

Referenced by kern_shm_open2(), and umtx_shm_create_reg().

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shm_chmod()

static int shm_chmod ( struct file *  fp, mode_t  mode, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1637 of file uipc_shm.c.

References mode, and vaccess().

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shm_chown()

static int shm_chown ( struct file *  fp, uid_t  uid, gid_t  gid, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1666 of file uipc_shm.c.

References groupmember(), and priv_check_cred().

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shm_close()

static int shm_close ( struct file *  fp, struct thread *  td  )

static

Definition at line 583 of file uipc_shm.c.

References shm_drop().

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shm_copyin_path()

static int shm_copyin_path ( struct thread *  td, const char *  userpath_in, char **  path_out  )

static

Definition at line 595 of file uipc_shm.c.

References free(), malloc(), and path.

Referenced by kern_shm_open2(), sys_shm_rename(), and sys_shm_unlink().

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shm_deallocate()

static int shm_deallocate ( struct shmfd *  shmfd, off_t *  offset, off_t *  length, int  flags  )

static

Definition at line 1897 of file uipc_shm.c.

References shm_partial_page_invalidate().

Referenced by shm_fspacectl().

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shm_dotruncate()

int shm_dotruncate	(	struct shmfd *	shmfd,
		off_t	length
	)

Definition at line 856 of file uipc_shm.c.

References rangelock_unlock(), rangelock_wlock(), and shm_dotruncate_cookie().

Referenced by shm_truncate(), and umtx_shm_create_reg().

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shm_dotruncate_cookie()

static int shm_dotruncate_cookie ( struct shmfd *  shmfd, off_t  length, void *  rl_cookie  )

static

Definition at line 843 of file uipc_shm.c.

References shm_dotruncate_largepage(), shm_dotruncate_locked(), and shm_largepage().

Referenced by shm_dotruncate(), shm_fallocate(), and shm_write().

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shm_dotruncate_largepage()

static int shm_dotruncate_largepage ( struct shmfd *  shmfd, off_t  length, void *  rl_cookie  )

static

Definition at line 750 of file uipc_shm.c.

References count_largepages, flags, largepage_reclaim_tries, and pagesizes.

Referenced by shm_dotruncate_cookie().

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shm_dotruncate_locked()

static int shm_dotruncate_locked ( struct shmfd *  shmfd, off_t  length, void *  rl_cookie  )

static

Definition at line 684 of file uipc_shm.c.

References shm_partial_page_invalidate(), and vfs_timestamp().

Referenced by kern_shm_open2(), and shm_dotruncate_cookie().

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shm_drop()

void shm_drop

(

struct shmfd *

shmfd

)

Definition at line 916 of file uipc_shm.c.

References free(), and rangelock_destroy().

Referenced by shm_close(), shm_remove(), sys_shm_rename(), and umtx_shm_free_reg().

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shm_fallocate()

static int shm_fallocate ( struct file *  fp, off_t  offset, off_t  len, struct thread *  td  )

static

Definition at line 1997 of file uipc_shm.c.

References rangelock_unlock(), rangelock_wlock(), and shm_dotruncate_cookie().

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shm_fill_kinfo()

static int shm_fill_kinfo ( struct file *  fp, struct kinfo_file *  kif, struct filedesc *fdp  __unused  )

static

Definition at line 1829 of file uipc_shm.c.

References res, and shm_fill_kinfo_locked().

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shm_fill_kinfo_locked()

static int shm_fill_kinfo_locked ( struct shmfd *  shmfd, struct kinfo_file *  kif, bool  list  )

static

Definition at line 1798 of file uipc_shm.c.

References path.

Referenced by shm_fill_kinfo(), and sysctl_posix_shm_list().

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shm_fspacectl()

static int shm_fspacectl ( struct file *  fp, int  cmd, off_t *  offset, off_t *  length, int  flags, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1958 of file uipc_shm.c.

References flags, rangelock_unlock(), rangelock_wlock(), and shm_deallocate().

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shm_get_seals()

static int shm_get_seals ( struct file *  fp, int *  seals  )

static

Definition at line 1887 of file uipc_shm.c.

shm_hold()

struct shmfd * shm_hold

(

struct shmfd *

shmfd

)

Definition at line 908 of file uipc_shm.c.

Referenced by kern_shm_open2(), shm_insert(), sys_shm_rename(), and umtx_shm().

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shm_init()

static void shm_init ( void *  arg )

static

Definition at line 953 of file uipc_shm.c.

References count_largepages, G, hashinit(), M, name, pagesizes, and snprintf().

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shm_insert()

static void shm_insert ( char *  path, Fnv32_t  fnv, struct shmfd *  shmfd  )

static

Definition at line 1006 of file uipc_shm.c.

References malloc(), path, SHM_HASH, shm_hold(), shm_mapping::sm_fnv, shm_mapping::sm_path, and shm_mapping::sm_shmfd.

Referenced by kern_shm_open2(), and sys_shm_rename().

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shm_ioctl()

int shm_ioctl	(	struct file *	fp,
		u_long	com,
		void *	data,
		struct ucred *	active_cred,
		struct thread *	td
	)

Definition at line 487 of file uipc_shm.c.

References data, pagesizes, rangelock_rlock(), rangelock_unlock(), rangelock_wlock(), and shm_largepage().

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shm_largepage()

bool shm_largepage

(

struct shmfd *

shmfd

)

Definition at line 342 of file uipc_shm.c.

Referenced by shm_add_seals(), shm_dotruncate_cookie(), shm_ioctl(), shm_mmap(), and shm_write().

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shm_largepage_phys_ctor()

static void shm_largepage_phys_ctor ( vm_object_t  object, vm_prot_t  prot, vm_ooffset_t  foff, struct ucred *  cred  )

static

Definition at line 312 of file uipc_shm.c.

shm_largepage_phys_dtor()

static void shm_largepage_phys_dtor ( vm_object_t  object )

static

Definition at line 318 of file uipc_shm.c.

References count_largepages, and pagesizes.

shm_largepage_phys_haspage()

static boolean_t shm_largepage_phys_haspage ( vm_object_t  object, vm_pindex_t  pindex, int *  before, int *  after  )

static

Definition at line 292 of file uipc_shm.c.

References pagesizes.

shm_largepage_phys_populate()

static int shm_largepage_phys_populate ( vm_object_t  object, vm_pindex_t  pidx, int  fault_type, vm_prot_t  max_prot, vm_pindex_t *  first, vm_pindex_t *  last  )

static

Definition at line 267 of file uipc_shm.c.

References pagesizes.

shm_lookup()

static struct shmfd * shm_lookup ( char *  path, Fnv32_t  fnv  )

static

Definition at line 991 of file uipc_shm.c.

References path, SHM_HASH, shm_mapping::sm_fnv, shm_mapping::sm_path, and shm_mapping::sm_shmfd.

Referenced by kern_shm_open2(), and sys_shm_rename().

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shm_map()

int shm_map	(	struct file *	fp,
		size_t	size,
		off_t	offset,
		void **	memp
	)

Definition at line 1700 of file uipc_shm.c.

shm_mmap()

static int shm_mmap ( struct file *  fp, vm_map_t  map, vm_offset_t *  addr, vm_size_t  objsize, vm_prot_t  prot, vm_prot_t  cap_maxprot, int  flags, vm_ooffset_t  foff, struct thread *  td  )

static

Definition at line 1544 of file uipc_shm.c.

References addr, flags, rangelock_rlock(), rangelock_unlock(), shm_largepage(), shm_mmap_large(), and vfs_timestamp().

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shm_mmap_large()

static int shm_mmap_large ( struct shmfd *  shmfd, vm_map_t  map, vm_offset_t *  addr, vm_size_t  size, vm_prot_t  prot, vm_prot_t  max_prot, int  flags, vm_ooffset_t  foff, struct thread *  td  )

static

Definition at line 1435 of file uipc_shm.c.

References addr, flags, lim_max(), mask, and pagesizes.

Referenced by shm_mmap().

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shm_partial_page_invalidate()

static int shm_partial_page_invalidate ( vm_object_t  object, vm_pindex_t  idx, int  base, int  end  )

static

Definition at line 633 of file uipc_shm.c.

Referenced by shm_deallocate(), and shm_dotruncate_locked().

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shm_read()

static int shm_read ( struct file *  fp, struct uio *  uio, struct ucred *  active_cred, int  flags, struct thread *  td  )

static

Definition at line 389 of file uipc_shm.c.

References flags, foffset_lock_uio(), foffset_unlock_uio(), rangelock_rlock(), rangelock_unlock(), and uiomove_object().

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shm_remove()

static int shm_remove ( char *  path, Fnv32_t  fnv, struct ucred *  ucred  )

static

Definition at line 1019 of file uipc_shm.c.

References free(), path, shm_access(), shm_drop(), SHM_HASH, shm_mapping::sm_fnv, shm_mapping::sm_path, and shm_mapping::sm_shmfd.

Referenced by sys_shm_rename(), and sys_shm_unlink().

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shm_seek()

static int shm_seek ( struct file *  fp, off_t  offset, int  whence, struct thread *  td  )

static

Definition at line 348 of file uipc_shm.c.

References foffset_lock(), and foffset_unlock().

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shm_stat()

static int shm_stat ( struct file *  fp, struct stat *  sb, struct ucred *  active_cred  )

static

Definition at line 541 of file uipc_shm.c.

References pagesizes.

shm_truncate()

static int shm_truncate ( struct file *  fp, off_t  length, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 469 of file uipc_shm.c.

References shm_dotruncate().

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shm_unmap()

int shm_unmap	(	struct file *	fp,
		void *	mem,
		size_t	size
	)

Definition at line 1758 of file uipc_shm.c.

shm_write()

static int shm_write ( struct file *  fp, struct uio *  uio, struct ucred *  active_cred, int  flags, struct thread *  td  )

static

Definition at line 412 of file uipc_shm.c.

References flags, foffset_lock_uio(), foffset_unlock_uio(), rangelock_unlock(), rangelock_wlock(), shm_dotruncate_cookie(), shm_largepage(), and uiomove_object().

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sys_shm_open2()

int sys_shm_open2	(	struct thread *	td,
		struct shm_open2_args *	uap
	)

Definition at line 2089 of file uipc_shm.c.

References kern_shm_open2().

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sys_shm_rename()

int sys_shm_rename	(	struct thread *	td,
		struct shm_rename_args *	uap
	)

Definition at line 1287 of file uipc_shm.c.

References flags, free(), shm_copyin_path(), shm_drop(), shm_hold(), shm_insert(), shm_lookup(), and shm_remove().

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sys_shm_unlink()

int sys_shm_unlink	(	struct thread *	td,
		struct shm_unlink_args *	uap
	)

Definition at line 1266 of file uipc_shm.c.

References free(), path, shm_copyin_path(), and shm_remove().

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SYSCTL_INT()

SYSCTL_INT	(	_vm_largepages	,
		OID_AUTO	,
		reclaim_tries	,
		CTLFLAG_RWTUN	,
		&	largepage_reclaim_tries,
		0	,
		"Number of contig reclaims before giving up for default alloc policy"
	)

SYSCTL_NODE()

static SYSCTL_NODE ( _vm  , OID_AUTO  , largepages  , CTLFLAG_RD|  CTLFLAG_MPSAFE, 0  , ""    )

static

sysctl_posix_shm_list()

static int sysctl_posix_shm_list ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 2030 of file uipc_shm.c.

References pack_kinfo(), sbuf_bcat(), sbuf_clear_flags(), sbuf_delete(), sbuf_finish(), sbuf_new_for_sysctl(), shm_fill_kinfo_locked(), and shm_mapping::sm_shmfd.

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SYSCTL_PROC()

SYSCTL_PROC	(	_kern_ipc	,
		OID_AUTO	,
		posix_shm_list	,
		CTLFLAG_RD|CTLFLAG_PRISON|CTLFLAG_MPSAFE|	CTLTYPE_OPAQUE,
		NULL	,
		0	,
		sysctl_posix_shm_list	,
		""	,
		"POSIX SHM list"
	)

SYSINIT()

SYSINIT	(	shm_init	,
		SI_SUB_SYSV_SHM	,
		SI_ORDER_ANY	,
		shm_init	,
		NULL
	)

uiomove_object()

int uiomove_object	(	vm_object_t	obj,
		off_t	obj_size,
		struct uio *	uio
	)

Definition at line 244 of file uipc_shm.c.

References uiomove_object_page().

Referenced by shm_read(), and shm_write().

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uiomove_object_page()

static int uiomove_object_page ( vm_object_t  obj, size_t  len, struct uio *  uio  )

static

Definition at line 187 of file uipc_shm.c.

References printf(), and uiomove().

Referenced by uiomove_object().

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Variable Documentation

count_largepages

u_long count_largepages[MAXPAGESIZES]

static

Definition at line 264 of file uipc_shm.c.

Referenced by shm_dotruncate_largepage(), shm_init(), and shm_largepage_phys_dtor().

largepage_reclaim_tries

int largepage_reclaim_tries = 1

static

Definition at line 181 of file uipc_shm.c.

Referenced by shm_dotruncate_largepage().

shm_largepage_phys_ops

const struct phys_pager_ops shm_largepage_phys_ops

static

Initial value:

= {
        .phys_pg_populate =     shm_largepage_phys_populate,
        .phys_pg_haspage =      shm_largepage_phys_haspage,
        .phys_pg_ctor =         shm_largepage_phys_ctor,
        .phys_pg_dtor =         shm_largepage_phys_dtor,
}

Definition at line 334 of file uipc_shm.c.

Referenced by shm_alloc().