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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Loopback mount info - one per mount
*/
#ifndef _SYS_FS_LOFS_INFO_H
#define _SYS_FS_LOFS_INFO_H
#ifdef _KERNEL
#include <sys/vfs_opreg.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
struct lnode;
struct lobucket {
kmutex_t lh_lock; /* lock protecting bucket contents */
struct lnode *lh_chain; /* vnode chain for this bucket */
uint_t lh_count; /* Number of vnodes in chain */
/* Pad up to 64-byte boundary to avoid false sharing */
#ifdef _LP64
char _pad[44];
#else
char _pad[48];
#endif
};
struct lo_retired_ht {
struct lo_retired_ht *lrh_next;
struct lobucket *lrh_table;
uint_t lrh_size;
};
struct loinfo {
struct vfs *li_realvfs; /* real vfs of mount */
struct vfs *li_mountvfs; /* loopback vfs */
struct vnode *li_rootvp; /* root vnode of this vfs */
int li_mflag; /* mount flags to inherit */
int li_dflag; /* mount flags to not inherit */
uint_t li_refct; /* # outstanding vnodes */
volatile uint_t li_htsize; /* # buckets in hashtable */
struct lobucket *volatile li_hashtable; /* table of per-mount vnodes */
struct lfsnode *li_lfs; /* list of other vfss */
kmutex_t li_lfslock; /* lock protecting li_lfs */
kmutex_t li_htlock; /* protect hashtable, htsize, retired */
struct lo_retired_ht *li_retired; /* list of retired hashtables */
int li_flag; /* filesystem behavior flags */
};
/* inheritable mount flags - propagated from real vfs to loopback */
#define INHERIT_VFS_FLAG \
(VFS_RDONLY|VFS_NOSETUID|VFS_NODEVICES|VFS_XATTR|VFS_NBMAND|VFS_NOEXEC)
/*
* "nosub" is used to provide NFS server-like semantics for lo_lookup(): never
* traverse mount points for sub-mounts. The lookup will instead look under
* the mount point.
*/
#define MNTOPT_LOFS_NOSUB "nosub"
#define MNTOPT_LOFS_SUB "sub"
/*
* Flag values (for li_flag)
*/
#define LO_NOSUB 0x02 /* don't traverse sub-mounts */
/*
* lfsnodes are allocated as new real vfs's are encountered
* when looking up things in a loopback name space
* It contains a new vfs which is paired with the real vfs
* so that vfs ops (fsstat) can get to the correct real vfs
* given just a loopback vfs
*/
struct lfsnode {
struct lfsnode *lfs_next; /* next in loinfo list */
struct vfs *lfs_realvfs; /* real vfs */
struct vnode *lfs_realrootvp; /* real root vp */
struct vfs lfs_vfs; /* new loopback vfs */
};
#define vtoli(VFSP) ((struct loinfo *)((VFSP)->vfs_data))
#ifdef _KERNEL
extern struct vfs *lo_realvfs(struct vfs *, struct vnode **);
extern void lofs_subrinit(void);
extern void lofs_subrfini(void);
extern void lsetup(struct loinfo *, uint_t);
extern void ldestroy(struct loinfo *);
extern const struct fs_operation_def lo_vnodeops_template[];
extern struct vnodeops *lo_vnodeops;
extern vfsops_t *lo_vfsops;
extern struct mod_ops mod_fsops;
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_LOFS_INFO_H */
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