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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 2007 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef	_SYS_FS_ZFS_VFSOPS_H
     27 #define	_SYS_FS_ZFS_VFSOPS_H
     28 
     29 #pragma ident	"@(#)zfs_vfsops.h	1.9	07/11/16 SMI"
     30 
     31 #include <sys/isa_defs.h>
     32 #include <sys/types32.h>
     33 #include <sys/list.h>
     34 #include <sys/vfs.h>
     35 #include <sys/zil.h>
     36 #include <sys/rrwlock.h>
     37 #include <sys/zfs_ioctl.h>
     38 
     39 #ifdef	__cplusplus
     40 extern "C" {
     41 #endif
     42 
     43 typedef struct zfsvfs zfsvfs_t;
     44 
     45 struct zfsvfs {
     46 	vfs_t		*z_vfs;		/* generic fs struct */
     47 	zfsvfs_t	*z_parent;	/* parent fs */
     48 	objset_t	*z_os;		/* objset reference */
     49 	uint64_t	z_root;		/* id of root znode */
     50 	uint64_t	z_unlinkedobj;	/* id of unlinked zapobj */
     51 	uint64_t	z_max_blksz;	/* maximum block size for files */
     52 	uint64_t	z_assign;	/* TXG_NOWAIT or set by zil_replay() */
     53 	uint64_t	z_fuid_obj;	/* fuid table object number */
     54 	avl_tree_t	z_fuid_idx;	/* fuid tree keyed by index */
     55 	avl_tree_t	z_fuid_domain;	/* fuid tree keyed by domain */
     56 	krwlock_t	z_fuid_lock;	/* fuid lock */
     57 	boolean_t	z_fuid_loaded;	/* fuid tables are loaded */
     58 	struct zfs_fuid_info	*z_fuid_replay; /* fuid info for replay */
     59 	zilog_t		*z_log;		/* intent log pointer */
     60 	uint_t		z_acl_mode;	/* acl chmod/mode behavior */
     61 	uint_t		z_acl_inherit;	/* acl inheritance behavior */
     62 	zfs_case_t	z_case;		/* case-sense */
     63 	boolean_t	z_utf8;		/* utf8-only */
     64 	int		z_norm;		/* normalization flags */
     65 	boolean_t	z_atime;	/* enable atimes mount option */
     66 	boolean_t	z_unmounted;	/* unmounted */
     67 	rrwlock_t	z_teardown_lock;
     68 	krwlock_t	z_teardown_inactive_lock;
     69 	list_t		z_all_znodes;	/* all vnodes in the fs */
     70 	kmutex_t	z_znodes_lock;	/* lock for z_all_znodes */
     71 	vnode_t		*z_ctldir;	/* .zfs directory pointer */
     72 	boolean_t	z_show_ctldir;	/* expose .zfs in the root dir */
     73 	boolean_t	z_issnap;	/* true if this is a snapshot */
     74 	boolean_t	z_vscan;	/* virus scan on/off */
     75 	boolean_t	z_use_fuids;	/* version allows fuids */
     76 	uint64_t	z_version;
     77 #define	ZFS_OBJ_MTX_SZ	64
     78 	kmutex_t	z_hold_mtx[ZFS_OBJ_MTX_SZ];	/* znode hold locks */
     79 };
     80 
     81 /*
     82  * Normal filesystems (those not under .zfs/snapshot) have a total
     83  * file ID size limited to 12 bytes (including the length field) due to
     84  * NFSv2 protocol's limitation of 32 bytes for a filehandle.  For historical
     85  * reasons, this same limit is being imposed by the Solaris NFSv3 implementation
     86  * (although the NFSv3 protocol actually permits a maximum of 64 bytes).  It
     87  * is not possible to expand beyond 12 bytes without abandoning support
     88  * of NFSv2.
     89  *
     90  * For normal filesystems, we partition up the available space as follows:
     91  *	2 bytes		fid length (required)
     92  *	6 bytes		object number (48 bits)
     93  *	4 bytes		generation number (32 bits)
     94  *
     95  * We reserve only 48 bits for the object number, as this is the limit
     96  * currently defined and imposed by the DMU.
     97  */
     98 typedef struct zfid_short {
     99 	uint16_t	zf_len;
    100 	uint8_t		zf_object[6];		/* obj[i] = obj >> (8 * i) */
    101 	uint8_t		zf_gen[4];		/* gen[i] = gen >> (8 * i) */
    102 } zfid_short_t;
    103 
    104 /*
    105  * Filesystems under .zfs/snapshot have a total file ID size of 22 bytes
    106  * (including the length field).  This makes files under .zfs/snapshot
    107  * accessible by NFSv3 and NFSv4, but not NFSv2.
    108  *
    109  * For files under .zfs/snapshot, we partition up the available space
    110  * as follows:
    111  *	2 bytes		fid length (required)
    112  *	6 bytes		object number (48 bits)
    113  *	4 bytes		generation number (32 bits)
    114  *	6 bytes		objset id (48 bits)
    115  *	4 bytes		currently just zero (32 bits)
    116  *
    117  * We reserve only 48 bits for the object number and objset id, as these are
    118  * the limits currently defined and imposed by the DMU.
    119  */
    120 typedef struct zfid_long {
    121 	zfid_short_t	z_fid;
    122 	uint8_t		zf_setid[6];		/* obj[i] = obj >> (8 * i) */
    123 	uint8_t		zf_setgen[4];		/* gen[i] = gen >> (8 * i) */
    124 } zfid_long_t;
    125 
    126 #define	SHORT_FID_LEN	(sizeof (zfid_short_t) - sizeof (uint16_t))
    127 #define	LONG_FID_LEN	(sizeof (zfid_long_t) - sizeof (uint16_t))
    128 
    129 extern uint_t zfs_fsyncer_key;
    130 
    131 extern int zfs_suspend_fs(zfsvfs_t *zfsvfs, char *osname, int *mode);
    132 extern int zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname, int mode);
    133 
    134 #ifdef	__cplusplus
    135 }
    136 #endif
    137 
    138 #endif	/* _SYS_FS_ZFS_VFSOPS_H */
    139