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freebsd-nq/sys/sys/mount.h
Mark Johnston 5f34e93c58 Check suspendability on the mountpoint returned by VOP_GETWRITEMOUNT. 
This obviates the need for a MNTK_SUSPENDABLE flag, since passthrough
filesystems like nullfs and unionfs no longer need to inherit this
information from their lower layer(s). This change also restores the
pre-r273336 behaviour of using the presence of a susp_clean VFS method to
request suspension support.

Reviewed by:	kib, mjg
Differential Revision:	https://reviews.freebsd.org/D2937
2015-07-05 22:37:33 +00:00

951 lines
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/*-
* Copyright (c) 1989, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)mount.h 8.21 (Berkeley) 5/20/95
* $FreeBSD$
*/
#ifndef _SYS_MOUNT_H_
#define _SYS_MOUNT_H_
#include <sys/ucred.h>
#include <sys/queue.h>
#ifdef _KERNEL
#include <sys/lock.h>
#include <sys/lockmgr.h>
#include <sys/_mutex.h>
#include <sys/_sx.h>
#endif
/*
* NOTE: When changing statfs structure, mount structure, MNT_* flags or
* MNTK_* flags also update DDB show mount command in vfs_subr.c.
*/
typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
/*
* File identifier.
* These are unique per filesystem on a single machine.
*/
#define MAXFIDSZ 16
struct fid {
u_short fid_len; /* length of data in bytes */
u_short fid_data0; /* force longword alignment */
char fid_data[MAXFIDSZ]; /* data (variable length) */
};
/*
* filesystem statistics
*/
#define MFSNAMELEN 16 /* length of type name including null */
#define MNAMELEN 88 /* size of on/from name bufs */
#define STATFS_VERSION 0x20030518 /* current version number */
struct statfs {
uint32_t f_version; /* structure version number */
uint32_t f_type; /* type of filesystem */
uint64_t f_flags; /* copy of mount exported flags */
uint64_t f_bsize; /* filesystem fragment size */
uint64_t f_iosize; /* optimal transfer block size */
uint64_t f_blocks; /* total data blocks in filesystem */
uint64_t f_bfree; /* free blocks in filesystem */
int64_t f_bavail; /* free blocks avail to non-superuser */
uint64_t f_files; /* total file nodes in filesystem */
int64_t f_ffree; /* free nodes avail to non-superuser */
uint64_t f_syncwrites; /* count of sync writes since mount */
uint64_t f_asyncwrites; /* count of async writes since mount */
uint64_t f_syncreads; /* count of sync reads since mount */
uint64_t f_asyncreads; /* count of async reads since mount */
uint64_t f_spare[10]; /* unused spare */
uint32_t f_namemax; /* maximum filename length */
uid_t f_owner; /* user that mounted the filesystem */
fsid_t f_fsid; /* filesystem id */
char f_charspare[80]; /* spare string space */
char f_fstypename[MFSNAMELEN]; /* filesystem type name */
char f_mntfromname[MNAMELEN]; /* mounted filesystem */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
};
#ifdef _KERNEL
#define OMFSNAMELEN 16 /* length of fs type name, including null */
#define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
/* XXX getfsstat.2 is out of date with write and read counter changes here. */
/* XXX statfs.2 is out of date with read counter changes here. */
struct ostatfs {
long f_spare2; /* placeholder */
long f_bsize; /* fundamental filesystem block size */
long f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in filesystem */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in filesystem */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* filesystem id */
uid_t f_owner; /* user that mounted the filesystem */
int f_type; /* type of filesystem */
int f_flags; /* copy of mount exported flags */
long f_syncwrites; /* count of sync writes since mount */
long f_asyncwrites; /* count of async writes since mount */
char f_fstypename[OMFSNAMELEN]; /* fs type name */
char f_mntonname[OMNAMELEN]; /* directory on which mounted */
long f_syncreads; /* count of sync reads since mount */
long f_asyncreads; /* count of async reads since mount */
short f_spares1; /* unused spare */
char f_mntfromname[OMNAMELEN];/* mounted filesystem */
short f_spares2; /* unused spare */
/*
* XXX on machines where longs are aligned to 8-byte boundaries, there
* is an unnamed int32_t here. This spare was after the apparent end
* of the struct until we bit off the read counters from f_mntonname.
*/
long f_spare[2]; /* unused spare */
};
TAILQ_HEAD(vnodelst, vnode);
/* Mount options list */
TAILQ_HEAD(vfsoptlist, vfsopt);
struct vfsopt {
TAILQ_ENTRY(vfsopt) link;
char *name;
void *value;
int len;
int pos;
int seen;
};
/*
* Structure per mounted filesystem. Each mounted filesystem has an
* array of operations and an instance record. The filesystems are
* put on a doubly linked list.
*
* Lock reference:
* m - mountlist_mtx
* i - interlock
* v - vnode freelist mutex
*
* Unmarked fields are considered stable as long as a ref is held.
*
*/
struct mount {
struct mtx mnt_mtx; /* mount structure interlock */
int mnt_gen; /* struct mount generation */
#define mnt_startzero mnt_list
TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
struct vfsops *mnt_op; /* operations on fs */
struct vfsconf *mnt_vfc; /* configuration info */
struct vnode *mnt_vnodecovered; /* vnode we mounted on */
struct vnode *mnt_syncer; /* syncer vnode */
int mnt_ref; /* (i) Reference count */
struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
int mnt_nvnodelistsize; /* (i) # of vnodes */
struct vnodelst mnt_activevnodelist; /* (v) list of active vnodes */
int mnt_activevnodelistsize;/* (v) # of active vnodes */
int mnt_writeopcount; /* (i) write syscalls pending */
int mnt_kern_flag; /* (i) kernel only flags */
uint64_t mnt_flag; /* (i) flags shared with user */
struct vfsoptlist *mnt_opt; /* current mount options */
struct vfsoptlist *mnt_optnew; /* new options passed to fs */
int mnt_maxsymlinklen; /* max size of short symlink */
struct statfs mnt_stat; /* cache of filesystem stats */
struct ucred *mnt_cred; /* credentials of mounter */
void * mnt_data; /* private data */
time_t mnt_time; /* last time written*/
int mnt_iosize_max; /* max size for clusters, etc */
struct netexport *mnt_export; /* export list */
struct label *mnt_label; /* MAC label for the fs */
u_int mnt_hashseed; /* Random seed for vfs_hash */
int mnt_lockref; /* (i) Lock reference count */
int mnt_secondary_writes; /* (i) # of secondary writes */
int mnt_secondary_accwrites;/* (i) secondary wr. starts */
struct thread *mnt_susp_owner; /* (i) thread owning suspension */
#define mnt_endzero mnt_gjprovider
char *mnt_gjprovider; /* gjournal provider name */
struct lock mnt_explock; /* vfs_export walkers lock */
TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */
TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/
};
/*
* Definitions for MNT_VNODE_FOREACH_ALL.
*/
struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
#define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \
for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \
(vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
#define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \
do { \
MNT_ILOCK(mp); \
__mnt_vnode_markerfree_all(&(mvp), (mp)); \
/* MNT_IUNLOCK(mp); -- done in above function */ \
mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
} while (0)
/*
* Definitions for MNT_VNODE_FOREACH_ACTIVE.
*/
struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
#define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \
for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \
(vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
#define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \
__mnt_vnode_markerfree_active(&(mvp), (mp))
#define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
#define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
#define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
#define MNT_MTX(mp) (&(mp)->mnt_mtx)
#define MNT_REF(mp) (mp)->mnt_ref++
#define MNT_REL(mp) do { \
KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
(mp)->mnt_ref--; \
if ((mp)->mnt_ref == 0) \
wakeup((mp)); \
} while (0)
#endif /* _KERNEL */
/*
* User specifiable flags, stored in mnt_flag.
*/
#define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */
#define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
#define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */
#define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */
#define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */
#define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */
#define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */
#define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */
#define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */
#define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
#define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */
#define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */
#define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */
#define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */
#define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */
#define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */
#define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */
#define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */
/*
* NFS export related mount flags.
*/
#define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */
#define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */
#define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */
#define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */
#define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */
#define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */
/*
* Flags set by internal operations,
* but visible to the user.
* XXX some of these are not quite right.. (I've never seen the root flag set)
*/
#define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */
#define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */
#define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */
#define MNT_USER 0x0000000000008000ULL /* mounted by a user */
#define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */
/*
* Mask of flags that are visible to statfs().
* XXX I think that this could now become (~(MNT_CMDFLAGS))
* but the 'mount' program may need changing to handle this.
*/
#define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
MNT_NOSUID | MNT_UNION | MNT_SUJ | \
MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
MNT_LOCAL | MNT_USER | MNT_QUOTA | \
MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \
MNT_NFS4ACLS | MNT_AUTOMOUNTED)
/* Mask of flags that can be updated. */
#define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
MNT_NOATIME | \
MNT_NOSYMFOLLOW | MNT_IGNORE | \
MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
MNT_ACLS | MNT_USER | MNT_NFS4ACLS | \
MNT_AUTOMOUNTED)
/*
* External filesystem command modifier flags.
* Unmount can use the MNT_FORCE flag.
* XXX: These are not STATES and really should be somewhere else.
* XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
* mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
*/
#define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */
#define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */
#define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */
#define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */
#define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */
#define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */
#define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
/*
* Internal filesystem control flags stored in mnt_kern_flag.
*
* MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
* past the mount point. This keeps the subtree stable during mounts
* and unmounts.
*
* MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
* dounmount() is still waiting to lock the mountpoint. This allows
* the filesystem to cancel operations that might otherwise deadlock
* with the unmount attempt (used by NFS).
*
* MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
* to allow for failed unmount attempt to restore the syncer vnode for
* the mount.
*/
#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
#define MNTK_ASYNC 0x00000002 /* filtered async flag */
#define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
#define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */
#define MNTK_DRAINING 0x00000010 /* lock draining is happening */
#define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
#define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
#define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
#define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads
and writes. Filesystem shall properly
handle i/o state on EFAULT. */
#define MNTK_VGONE_UPPER 0x00000200
#define MNTK_VGONE_WAITER 0x00000400
#define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
#define MNTK_MARKER 0x00001000
#define MNTK_UNMAPPED_BUFS 0x00002000
#define MNTK_USES_BCACHE 0x00004000 /* FS uses the buffer cache. */
#define MNTK_NOASYNC 0x00800000 /* disable async */
#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
#define MNTK_SUSPEND 0x08000000 /* request write suspension */
#define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
#define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
#define MNTK_UNUSED1 0x20000000
#define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
#define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
#ifdef _KERNEL
static inline int
MNT_SHARED_WRITES(struct mount *mp)
{
return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
}
static inline int
MNT_EXTENDED_SHARED(struct mount *mp)
{
return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
}
#endif
/*
* Sysctl CTL_VFS definitions.
*
* Second level identifier specifies which filesystem. Second level
* identifier VFS_VFSCONF returns information about all filesystems.
* Second level identifier VFS_GENERIC is non-terminal.
*/
#define VFS_VFSCONF 0 /* get configured filesystems */
#define VFS_GENERIC 0 /* generic filesystem information */
/*
* Third level identifiers for VFS_GENERIC are given below; third
* level identifiers for specific filesystems are given in their
* mount specific header files.
*/
#define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
#define VFS_CONF 2 /* struct: vfsconf for filesystem given
as next argument */
/*
* Flags for various system call interfaces.
*
* waitfor flags to vfs_sync() and getfsstat()
*/
#define MNT_WAIT 1 /* synchronously wait for I/O to complete */
#define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
#define MNT_LAZY 3 /* push data not written by filesystem syncer */
#define MNT_SUSPEND 4 /* Suspend file system after sync */
/*
* Generic file handle
*/
struct fhandle {
fsid_t fh_fsid; /* Filesystem id of mount point */
struct fid fh_fid; /* Filesys specific id */
};
typedef struct fhandle fhandle_t;
/*
* Old export arguments without security flavor list
*/
struct oexport_args {
int ex_flags; /* export related flags */
uid_t ex_root; /* mapping for root uid */
struct xucred ex_anon; /* mapping for anonymous user */
struct sockaddr *ex_addr; /* net address to which exported */
u_char ex_addrlen; /* and the net address length */
struct sockaddr *ex_mask; /* mask of valid bits in saddr */
u_char ex_masklen; /* and the smask length */
char *ex_indexfile; /* index file for WebNFS URLs */
};
/*
* Export arguments for local filesystem mount calls.
*/
#define MAXSECFLAVORS 5
struct export_args {
int ex_flags; /* export related flags */
uid_t ex_root; /* mapping for root uid */
struct xucred ex_anon; /* mapping for anonymous user */
struct sockaddr *ex_addr; /* net address to which exported */
u_char ex_addrlen; /* and the net address length */
struct sockaddr *ex_mask; /* mask of valid bits in saddr */
u_char ex_masklen; /* and the smask length */
char *ex_indexfile; /* index file for WebNFS URLs */
int ex_numsecflavors; /* security flavor count */
int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
};
/*
* Structure holding information for a publicly exported filesystem
* (WebNFS). Currently the specs allow just for one such filesystem.
*/
struct nfs_public {
int np_valid; /* Do we hold valid information */
fhandle_t np_handle; /* Filehandle for pub fs (internal) */
struct mount *np_mount; /* Mountpoint of exported fs */
char *np_index; /* Index file */
};
/*
* Filesystem configuration information. One of these exists for each
* type of filesystem supported by the kernel. These are searched at
* mount time to identify the requested filesystem.
*
* XXX: Never change the first two arguments!
*/
struct vfsconf {
u_int vfc_version; /* ABI version number */
char vfc_name[MFSNAMELEN]; /* filesystem type name */
struct vfsops *vfc_vfsops; /* filesystem operations vector */
int vfc_typenum; /* historic filesystem type number */
int vfc_refcount; /* number mounted of this type */
int vfc_flags; /* permanent flags */
struct vfsoptdecl *vfc_opts; /* mount options */
TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
};
/* Userland version of the struct vfsconf. */
struct xvfsconf {
struct vfsops *vfc_vfsops; /* filesystem operations vector */
char vfc_name[MFSNAMELEN]; /* filesystem type name */
int vfc_typenum; /* historic filesystem type number */
int vfc_refcount; /* number mounted of this type */
int vfc_flags; /* permanent flags */
struct vfsconf *vfc_next; /* next in list */
};
#ifndef BURN_BRIDGES
struct ovfsconf {
void *vfc_vfsops;
char vfc_name[32];
int vfc_index;
int vfc_refcount;
int vfc_flags;
};
#endif
/*
* NB: these flags refer to IMPLEMENTATION properties, not properties of
* any actual mounts; i.e., it does not make sense to change the flags.
*/
#define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
#define VFCF_NETWORK 0x00020000 /* may get data over the network */
#define VFCF_READONLY 0x00040000 /* writes are not implemented */
#define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
#define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
#define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
#define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
#define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
#define VFCF_SBDRY 0x01000000 /* defer stop requests */
typedef uint32_t fsctlop_t;
struct vfsidctl {
int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
fsid_t vc_fsid; /* fsid to operate on */
char vc_fstypename[MFSNAMELEN];
/* type of fs 'nfs' or '*' */
fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
void *vc_ptr; /* pointer to data structure */
size_t vc_len; /* sizeof said structure */
u_int32_t vc_spare[12]; /* spare (must be zero) */
};
/* vfsidctl API version. */
#define VFS_CTL_VERS1 0x01
/*
* New style VFS sysctls, do not reuse/conflict with the namespace for
* private sysctls.
* All "global" sysctl ops have the 33rd bit set:
* 0x...1....
* Private sysctl ops should have the 33rd bit unset.
*/
#define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
#define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
#define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
struct vfsquery {
u_int32_t vq_flags;
u_int32_t vq_spare[31];
};
/* vfsquery flags */
#define VQ_NOTRESP 0x0001 /* server down */
#define VQ_NEEDAUTH 0x0002 /* server bad auth */
#define VQ_LOWDISK 0x0004 /* we're low on space */
#define VQ_MOUNT 0x0008 /* new filesystem arrived */
#define VQ_UNMOUNT 0x0010 /* filesystem has left */
#define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
#define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
program */
#define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
#define VQ_FLAG0100 0x0100 /* placeholder */
#define VQ_FLAG0200 0x0200 /* placeholder */
#define VQ_FLAG0400 0x0400 /* placeholder */
#define VQ_FLAG0800 0x0800 /* placeholder */
#define VQ_FLAG1000 0x1000 /* placeholder */
#define VQ_FLAG2000 0x2000 /* placeholder */
#define VQ_FLAG4000 0x4000 /* placeholder */
#define VQ_FLAG8000 0x8000 /* placeholder */
#ifdef _KERNEL
/* Point a sysctl request at a vfsidctl's data. */
#define VCTLTOREQ(vc, req) \
do { \
(req)->newptr = (vc)->vc_ptr; \
(req)->newlen = (vc)->vc_len; \
(req)->newidx = 0; \
} while (0)
#endif
struct iovec;
struct uio;
#ifdef _KERNEL
/*
* vfs_busy specific flags and mask.
*/
#define MBF_NOWAIT 0x01
#define MBF_MNTLSTLOCK 0x02
#define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_MOUNT);
#endif
extern int maxvfsconf; /* highest defined filesystem type */
extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
TAILQ_HEAD(vfsconfhead, vfsconf);
extern struct vfsconfhead vfsconf;
/*
* Operations supported on mounted filesystem.
*/
struct mount_args;
struct nameidata;
struct sysctl_req;
struct mntarg;
typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
typedef int vfs_unmount_t(struct mount *mp, int mntflags);
typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
typedef int vfs_sync_t(struct mount *mp, int waitfor);
typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
struct vnode **vpp);
typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
int flags, struct vnode **vpp);
typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
int *extflagsp, struct ucred **credanonp,
int *numsecflavors, int **secflavors);
typedef int vfs_init_t(struct vfsconf *);
typedef int vfs_uninit_t(struct vfsconf *);
typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
struct vnode *filename_vp, int attrnamespace,
const char *attrname);
typedef int vfs_mount_t(struct mount *mp);
typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
struct sysctl_req *req);
typedef void vfs_susp_clean_t(struct mount *mp);
typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
typedef void vfs_purge_t(struct mount *mp);
struct vfsops {
vfs_mount_t *vfs_mount;
vfs_cmount_t *vfs_cmount;
vfs_unmount_t *vfs_unmount;
vfs_root_t *vfs_root;
vfs_quotactl_t *vfs_quotactl;
vfs_statfs_t *vfs_statfs;
vfs_sync_t *vfs_sync;
vfs_vget_t *vfs_vget;
vfs_fhtovp_t *vfs_fhtovp;
vfs_checkexp_t *vfs_checkexp;
vfs_init_t *vfs_init;
vfs_uninit_t *vfs_uninit;
vfs_extattrctl_t *vfs_extattrctl;
vfs_sysctl_t *vfs_sysctl;
vfs_susp_clean_t *vfs_susp_clean;
vfs_notify_lowervp_t *vfs_reclaim_lowervp;
vfs_notify_lowervp_t *vfs_unlink_lowervp;
vfs_purge_t *vfs_purge;
vfs_mount_t *vfs_spare[6]; /* spares for ABI compat */
};
vfs_statfs_t __vfs_statfs;
#define VFS_PROLOGUE(MP) do { \
struct mount *mp__; \
int _enable_stops; \
\
mp__ = (MP); \
_enable_stops = (mp__ != NULL && \
(mp__->mnt_vfc->vfc_flags & VFCF_SBDRY) && sigdeferstop())
#define VFS_EPILOGUE(MP) \
if (_enable_stops) \
sigallowstop(); \
} while (0)
#define VFS_MOUNT(MP) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_mount)(MP); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_UNMOUNT(MP, FORCE) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_ROOT(MP, FLAGS, VPP) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_QUOTACTL(MP, C, U, A) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_STATFS(MP, SBP) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = __vfs_statfs((MP), (SBP)); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_SYNC(MP, WAIT) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_VGET(MP, INO, FLAGS, VPP) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
SEC); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_SYSCTL(MP, OP, REQ) ({ \
int _rc; \
\
VFS_PROLOGUE(MP); \
_rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \
VFS_EPILOGUE(MP); \
_rc; })
#define VFS_SUSP_CLEAN(MP) do { \
if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \
VFS_PROLOGUE(MP); \
(*(MP)->mnt_op->vfs_susp_clean)(MP); \
VFS_EPILOGUE(MP); \
} \
} while (0)
#define VFS_RECLAIM_LOWERVP(MP, VP) do { \
if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \
VFS_PROLOGUE(MP); \
(*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \
VFS_EPILOGUE(MP); \
} \
} while (0)
#define VFS_UNLINK_LOWERVP(MP, VP) do { \
if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) { \
VFS_PROLOGUE(MP); \
(*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP)); \
VFS_EPILOGUE(MP); \
} \
} while (0)
#define VFS_PURGE(MP) do { \
if (*(MP)->mnt_op->vfs_purge != NULL) { \
VFS_PROLOGUE(MP); \
(*(MP)->mnt_op->vfs_purge)(MP); \
VFS_EPILOGUE(MP); \
} \
} while (0)
#define VFS_KNOTE_LOCKED(vp, hint) do \
{ \
if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
} while (0)
#define VFS_KNOTE_UNLOCKED(vp, hint) do \
{ \
if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
VN_KNOTE((vp), (hint), 0); \
} while (0)
#define VFS_NOTIFY_UPPER_RECLAIM 1
#define VFS_NOTIFY_UPPER_UNLINK 2
#include <sys/module.h>
/*
* Version numbers.
*/
#define VFS_VERSION_00 0x19660120
#define VFS_VERSION_01 0x20121030
#define VFS_VERSION VFS_VERSION_01
#define VFS_SET(vfsops, fsname, flags) \
static struct vfsconf fsname ## _vfsconf = { \
.vfc_version = VFS_VERSION, \
.vfc_name = #fsname, \
.vfc_vfsops = &vfsops, \
.vfc_typenum = -1, \
.vfc_flags = flags, \
}; \
static moduledata_t fsname ## _mod = { \
#fsname, \
vfs_modevent, \
& fsname ## _vfsconf \
}; \
DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
/*
* exported vnode operations
*/
int dounmount(struct mount *, int, struct thread *);
int kernel_mount(struct mntarg *ma, uint64_t flags);
int kernel_vmount(int flags, ...);
struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
void statfs_scale_blocks(struct statfs *sf, long max_size);
struct vfsconf *vfs_byname(const char *);
struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
void vfs_mount_destroy(struct mount *);
void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
void vfs_freeopts(struct vfsoptlist *opts);
void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
uint64_t val);
int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
int vfs_getopt_size(struct vfsoptlist *opts, const char *name,
off_t *value);
char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
int vfs_filteropt(struct vfsoptlist *, const char **legal);
void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
int len);
int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
int len);
int vfs_setopts(struct vfsoptlist *opts, const char *name,
const char *value);
int vfs_setpublicfs /* set publicly exported fs */
(struct mount *, struct netexport *, struct export_args *);
void vfs_msync(struct mount *, int);
int vfs_busy(struct mount *, int);
int vfs_export /* process mount export info */
(struct mount *, struct export_args *);
void vfs_allocate_syncvnode(struct mount *);
void vfs_deallocate_syncvnode(struct mount *);
int vfs_donmount(struct thread *td, uint64_t fsflags,
struct uio *fsoptions);
void vfs_getnewfsid(struct mount *);
struct cdev *vfs_getrootfsid(struct mount *);
struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
struct mount *vfs_busyfs(fsid_t *);
int vfs_modevent(module_t, int, void *);
void vfs_mount_error(struct mount *, const char *, ...);
void vfs_mountroot(void); /* mount our root filesystem */
void vfs_mountedfrom(struct mount *, const char *from);
void vfs_notify_upper(struct vnode *, int);
void vfs_oexport_conv(const struct oexport_args *oexp,
struct export_args *exp);
void vfs_ref(struct mount *);
void vfs_rel(struct mount *);
struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
struct ucred *);
int vfs_suser(struct mount *, struct thread *);
void vfs_unbusy(struct mount *);
void vfs_unmountall(void);
extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
extern struct mtx mountlist_mtx;
extern struct nfs_public nfs_pub;
extern struct sx vfsconf_sx;
#define vfsconf_lock() sx_xlock(&vfsconf_sx)
#define vfsconf_unlock() sx_xunlock(&vfsconf_sx)
#define vfsconf_slock() sx_slock(&vfsconf_sx)
#define vfsconf_sunlock() sx_sunlock(&vfsconf_sx)
/*
* Declarations for these vfs default operations are located in
* kern/vfs_default.c. They will be automatically used to replace
* null entries in VFS ops tables when registering a new filesystem
* type in the global table.
*/
vfs_root_t vfs_stdroot;
vfs_quotactl_t vfs_stdquotactl;
vfs_statfs_t vfs_stdstatfs;
vfs_sync_t vfs_stdsync;
vfs_sync_t vfs_stdnosync;
vfs_vget_t vfs_stdvget;
vfs_fhtovp_t vfs_stdfhtovp;
vfs_checkexp_t vfs_stdcheckexp;
vfs_init_t vfs_stdinit;
vfs_uninit_t vfs_stduninit;
vfs_extattrctl_t vfs_stdextattrctl;
vfs_sysctl_t vfs_stdsysctl;
void syncer_suspend(void);
void syncer_resume(void);
#else /* !_KERNEL */
#include <sys/cdefs.h>
struct stat;
__BEGIN_DECLS
int fhopen(const struct fhandle *, int);
int fhstat(const struct fhandle *, struct stat *);
int fhstatfs(const struct fhandle *, struct statfs *);
int fstatfs(int, struct statfs *);
int getfh(const char *, fhandle_t *);
int getfsstat(struct statfs *, long, int);
int getmntinfo(struct statfs **, int);
int lgetfh(const char *, fhandle_t *);
int mount(const char *, const char *, int, void *);
int nmount(struct iovec *, unsigned int, int);
int statfs(const char *, struct statfs *);
int unmount(const char *, int);
/* C library stuff */
int getvfsbyname(const char *, struct xvfsconf *);
__END_DECLS
#endif /* _KERNEL */
#endif /* !_SYS_MOUNT_H_ */
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