include/sys/fs/mntdata.h

   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 (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #ifndef _SYS_MNTFS_MNTDATA_H
  26 #define _SYS_MNTFS_MNTDATA_H
  27
  28 #include <sys/vnode.h>
  29 #include <sys/poll.h>
  30 #include <sys/mnttab.h>
  31 #include <sys/zone.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         vnode_t *mnt_vnode;     /* vnode for this mntnode */
  66         vnode_t *mnt_mountvp;   /* vnode mounted on */
  67         krwlock_t mnt_contents; /* protects mnt_flags, mnt_read & mnt_ioctl */
  68         uint_t mnt_flags;       /* flags; see below */
  69         mntsnap_t mnt_read;     /* data for read() */
  70         mntsnap_t mnt_ioctl;    /* data for ioctl() */
  71 } mntnode_t;
  72
  73 /*
  74  * Conversion macros.
  75  */
  76 #define VTOM(vp)        ((struct mntnode *)(vp)->v_data)
  77 #define MTOV(pnp)       ((pnp)->mnt_vnode)
  78 #define MTOD(pnp)       ((struct mntdata *)MTOV(pnp)->v_vfsp->vfs_data)
  79
  80 #define MNTFS_ELEM_IS_DEAD(x)   ((x)->mnte_death.tv_sec || \
  81                                 (x)->mnte_death.tv_nsec)
  82 #define MNTFS_ELEM_IS_ALIVE(x)  !MNTFS_ELEM_IS_DEAD(x)
  83
  84 #if defined(_KERNEL)
  85
  86 typedef struct mntdata {
  87         zone_ref_t mnt_zone_ref;        /* zone for mount point */
  88         uint_t mnt_nopen;               /* count of vnodes open */
  89         size_t mnt_size;                /* size of last normal snapshot */
  90         size_t mnt_hidden_size;         /* size of last hidden snapshot */
  91         timespec_t mnt_mtime;           /* mtime at last normal snapshot */
  92         timespec_t mnt_hidden_mtime;    /* mtime at last hidden snapshot */
  93         struct mntnode mnt_node;        /* embedded mntnode */
  94 } mntdata_t;
  95
  96 /*
  97  * Value for a mntsnap_t's mnts_flags.
  98  */
  99 #define MNTS_SHOWHIDDEN 0x1     /* This snapshot contains hidden mounts. */
 100 #define MNTS_REWIND     0x2     /* This snapshot must be refreshed. */
 101 /*
 102  * Values for a mntnode_t's mnt_flags.
 103  */
 104 #define MNT_SHOWHIDDEN  0x1     /* Include MS_NOMNTTAB mounts in snapshots. */
 105
 106 extern  const struct vnodeops   mntvnodeops;
 107 extern  void mntfs_getmntopts(struct vfs *, char **, size_t *);
 108
 109 #endif  /* _KERNEL */
 110
 111 #ifdef  __cplusplus
 112 }
 113 #endif
 114
 115 #endif  /* _SYS_MNTFS_MNTDATA_H */