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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef _SYS_MNTFS_MNTDATA_H
     27 #define	_SYS_MNTFS_MNTDATA_H
     28 
     29 #include <sys/vnode.h>
     30 #include <sys/poll.h>
     31 #include <sys/mnttab.h>
     32 
     33 #ifdef	__cplusplus
     34 extern "C" {
     35 #endif
     36 
     37 typedef struct mntelem {
     38 	/* Metadata. */
     39 	struct mntelem 	*mnte_next;
     40 	struct mntelem 	*mnte_prev;
     41 	timespec_t	mnte_birth;
     42 	timespec_t	mnte_death;
     43 	timespec_t	mnte_vfs_ctime;
     44 	int		mnte_refcnt;
     45 	/* Payload. */
     46 	int		mnte_hidden;
     47 	char		*mnte_text;
     48 	size_t		mnte_text_size;
     49 	struct extmnttab mnte_tab;
     50 } mntelem_t;
     51 
     52 typedef struct mntsnap {
     53 	timespec_t mnts_time;		/* Time of this snapshot. */
     54 	timespec_t mnts_last_mtime;	/* mnttab modification time. */
     55 	mntelem_t *mnts_first;		/* First element in this snapshot. */
     56 	mntelem_t *mnts_next;		/* Next element to use. */
     57 	int mnts_flags;			/* flags; see below. */
     58 	size_t mnts_nmnts;		/* # of elements in this snapshot. */
     59 	size_t mnts_text_size;		/* Text size for this snapshot. */
     60 	size_t mnts_foffset;		/* File offset of last read(). */
     61 	size_t mnts_ieoffset;		/* Offset of last read() in element. */
     62 } mntsnap_t;
     63 
     64 typedef struct mntnode {
     65 	krwlock_t mnt_contents;	/* protects mnt_read, mnt_ioctl, mnt_offset */
     66 	uint_t mnt_flags;	/* flags; see below */
     67 	vnode_t *mnt_mountvp;	/* vnode mounted on */
     68 	vnode_t *mnt_vnode;	/* vnode for this mntnode */
     69 	mntsnap_t mnt_read;	/* Data for read() */
     70 	mntsnap_t mnt_ioctl;	/* Data for ioctl() */
     71 } mntnode_t;
     72 
     73 struct zone;
     74 
     75 typedef struct mntdata {
     76 	struct zone *mnt_zone;		/* zone for mount point */
     77 	uint_t mnt_nopen;		/* count of vnodes open */
     78 	size_t mnt_size;		/* latest snapshot size for mount */
     79 	struct mntnode mnt_node;	/* embedded mntnode */
     80 } mntdata_t;
     81 
     82 /*
     83  * Conversion macros.
     84  */
     85 #define	VTOM(vp)	((struct mntnode *)(vp)->v_data)
     86 #define	MTOV(pnp)	((pnp)->mnt_vnode)
     87 #define	MTOD(pnp)	((struct mntdata *)MTOV(pnp)->v_vfsp->vfs_data)
     88 
     89 #define	MNTFS_ELEM_IS_DEAD(x)	((x)->mnte_death.tv_sec || \
     90 				(x)->mnte_death.tv_nsec)
     91 #define	MNTFS_ELEM_IS_ALIVE(x)	!MNTFS_ELEM_IS_DEAD(x)
     92 
     93 #if defined(_KERNEL)
     94 
     95 /*
     96  * Value for a mntsnap_t's mnts_flags.
     97  */
     98 #define	MNTS_SHOWHIDDEN	0x1	/* This snapshot contains hidden mounts. */
     99 #define	MNTS_REWIND	0x2	/* This snapshot must be refreshed. */
    100 /*
    101  * Values for a mntnode_t's mnt_flags.
    102  */
    103 #define	MNT_SHOWHIDDEN	0x1	/* Include MS_NOMNTTAB mounts in snapshots. */
    104 
    105 extern	struct vnodeops	*mntvnodeops;
    106 extern	void mntfs_getmntopts(struct vfs *, char **, size_t *);
    107 
    108 #endif	/* _KERNEL */
    109 
    110 #ifdef	__cplusplus
    111 }
    112 #endif
    113 
    114 #endif	/* _SYS_MNTFS_MNTDATA_H */
    115