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47e3dba972
In C, const indicates to the reader that mutation will not occur. It can also serve as a hint about ownership. Add const in a few places where it makes sense. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ryan Moeller <freqlabs@FreeBSD.org> Closes #10997
104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* LLNL-CODE-403049.
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* Rewritten for Linux by:
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* Rohan Puri <rohan.puri15@gmail.com>
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* Brian Behlendorf <behlendorf1@llnl.gov>
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*/
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#ifndef _ZFS_CTLDIR_H
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#define _ZFS_CTLDIR_H
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#include <sys/vnode.h>
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#include <sys/pathname.h>
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#include <sys/zfs_vfsops.h>
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#include <sys/zfs_znode.h>
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#define ZFS_CTLDIR_NAME ".zfs"
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#define ZFS_SNAPDIR_NAME "snapshot"
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#define ZFS_SHAREDIR_NAME "shares"
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#define zfs_has_ctldir(zdp) \
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((zdp)->z_id == ZTOZSB(zdp)->z_root && \
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(ZTOZSB(zdp)->z_ctldir != NULL))
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#define zfs_show_ctldir(zdp) \
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(zfs_has_ctldir(zdp) && \
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(ZTOZSB(zdp)->z_show_ctldir))
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extern int zfs_expire_snapshot;
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/* zfsctl generic functions */
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extern int zfsctl_create(zfsvfs_t *);
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extern void zfsctl_destroy(zfsvfs_t *);
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extern struct inode *zfsctl_root(znode_t *);
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extern void zfsctl_init(void);
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extern void zfsctl_fini(void);
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extern boolean_t zfsctl_is_node(struct inode *ip);
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extern boolean_t zfsctl_is_snapdir(struct inode *ip);
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extern int zfsctl_fid(struct inode *ip, fid_t *fidp);
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/* zfsctl '.zfs' functions */
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extern int zfsctl_root_lookup(struct inode *dip, const char *name,
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struct inode **ipp, int flags, cred_t *cr, int *direntflags,
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pathname_t *realpnp);
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/* zfsctl '.zfs/snapshot' functions */
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extern int zfsctl_snapdir_lookup(struct inode *dip, const char *name,
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struct inode **ipp, int flags, cred_t *cr, int *direntflags,
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pathname_t *realpnp);
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extern int zfsctl_snapdir_rename(struct inode *sdip, const char *sname,
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struct inode *tdip, const char *tname, cred_t *cr, int flags);
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extern int zfsctl_snapdir_remove(struct inode *dip, const char *name,
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cred_t *cr, int flags);
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extern int zfsctl_snapdir_mkdir(struct inode *dip, const char *dirname,
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vattr_t *vap, struct inode **ipp, cred_t *cr, int flags);
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extern int zfsctl_snapshot_mount(struct path *path, int flags);
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extern int zfsctl_snapshot_unmount(const char *snapname, int flags);
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extern int zfsctl_snapshot_unmount_delay(spa_t *spa, uint64_t objsetid,
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int delay);
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extern int zfsctl_snapdir_vget(struct super_block *sb, uint64_t objsetid,
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int gen, struct inode **ipp);
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/* zfsctl '.zfs/shares' functions */
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extern int zfsctl_shares_lookup(struct inode *dip, char *name,
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struct inode **ipp, int flags, cred_t *cr, int *direntflags,
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pathname_t *realpnp);
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/*
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* These inodes numbers are reserved for the .zfs control directory.
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* It is important that they be no larger that 48-bits because only
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* 6 bytes are reserved in the NFS file handle for the object number.
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* However, they should be as large as possible to avoid conflicts
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* with the objects which are assigned monotonically by the dmu.
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*/
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#define ZFSCTL_INO_ROOT 0x0000FFFFFFFFFFFFULL
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#define ZFSCTL_INO_SHARES 0x0000FFFFFFFFFFFEULL
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#define ZFSCTL_INO_SNAPDIR 0x0000FFFFFFFFFFFDULL
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#define ZFSCTL_INO_SNAPDIRS 0x0000FFFFFFFFFFFCULL
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#define ZFSCTL_EXPIRE_SNAPSHOT 300
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#endif /* _ZFS_CTLDIR_H */
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