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.
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.
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]
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
27 * Loopback mount info - one per mount
30 #ifndef _SYS_FS_LOFS_INFO_H
31 #define _SYS_FS_LOFS_INFO_H
34 #include <sys/vfs_opreg.h>
44 kmutex_t lh_lock
; /* lock protecting bucket contents */
45 struct lnode
*lh_chain
; /* vnode chain for this bucket */
46 uint_t lh_count
; /* Number of vnodes in chain */
47 /* Pad up to 64-byte boundary to avoid false sharing */
55 struct lo_retired_ht
{
56 struct lo_retired_ht
*lrh_next
;
57 struct lobucket
*lrh_table
;
62 struct vfs
*li_realvfs
; /* real vfs of mount */
63 struct vfs
*li_mountvfs
; /* loopback vfs */
64 struct vnode
*li_rootvp
; /* root vnode of this vfs */
65 int li_mflag
; /* mount flags to inherit */
66 int li_dflag
; /* mount flags to not inherit */
67 uint_t li_refct
; /* # outstanding vnodes */
68 volatile uint_t li_htsize
; /* # buckets in hashtable */
69 struct lobucket
*volatile li_hashtable
; /* table of per-mount vnodes */
70 struct lfsnode
*li_lfs
; /* list of other vfss */
71 kmutex_t li_lfslock
; /* lock protecting li_lfs */
72 kmutex_t li_htlock
; /* protect hashtable, htsize, retired */
73 struct lo_retired_ht
*li_retired
; /* list of retired hashtables */
74 int li_flag
; /* filesystem behavior flags */
77 /* inheritable mount flags - propagated from real vfs to loopback */
78 #define INHERIT_VFS_FLAG \
79 (VFS_RDONLY|VFS_NOSETUID|VFS_NODEVICES|VFS_XATTR|VFS_NBMAND|VFS_NOEXEC)
82 * "nosub" is used to provide NFS server-like semantics for lo_lookup(): never
83 * traverse mount points for sub-mounts. The lookup will instead look under
86 #define MNTOPT_LOFS_NOSUB "nosub"
87 #define MNTOPT_LOFS_SUB "sub"
90 * Flag values (for li_flag)
92 #define LO_NOSUB 0x02 /* don't traverse sub-mounts */
95 * lfsnodes are allocated as new real vfs's are encountered
96 * when looking up things in a loopback name space
97 * It contains a new vfs which is paired with the real vfs
98 * so that vfs ops (fsstat) can get to the correct real vfs
99 * given just a loopback vfs
102 struct lfsnode
*lfs_next
; /* next in loinfo list */
103 struct vfs
*lfs_realvfs
; /* real vfs */
104 struct vnode
*lfs_realrootvp
; /* real root vp */
105 struct vfs lfs_vfs
; /* new loopback vfs */
108 #define vtoli(VFSP) ((struct loinfo *)((VFSP)->vfs_data))
111 extern struct vfs
*lo_realvfs(struct vfs
*, struct vnode
**);
112 extern void lofs_subrinit(void);
113 extern void lofs_subrfini(void);
115 extern void lsetup(struct loinfo
*, uint_t
);
116 extern void ldestroy(struct loinfo
*);
118 extern const struct fs_operation_def lo_vnodeops_template
[];
120 extern struct vnodeops
*lo_vnodeops
;
121 extern vfsops_t
*lo_vfsops
;
122 extern struct mod_ops mod_fsops
;
131 #endif /* _SYS_FS_LOFS_INFO_H */