FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/linux/zfs/sys/zfs_ctldir.h

     /*
      * 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 https://opensource.org/licenses/CDDL-1.0.
     * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
     * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
     * LLNL-CODE-403049.
     * Rewritten for Linux by:
     *   Rohan Puri <rohan.puri15@gmail.com>
     *   Brian Behlendorf <behlendorf1@llnl.gov>
     */
    
    #ifndef _ZFS_CTLDIR_H
    #define _ZFS_CTLDIR_H
    
    #include <sys/vnode.h>
    #include <sys/pathname.h>
    #include <sys/zfs_vfsops.h>
    #include <sys/zfs_znode.h>
    
    #define ZFS_CTLDIR_NAME         ".zfs"
    #define ZFS_SNAPDIR_NAME        "snapshot"
    #define ZFS_SHAREDIR_NAME       "shares"
    
    #define zfs_has_ctldir(zdp)     \
            ((zdp)->z_id == ZTOZSB(zdp)->z_root && \
            (ZTOZSB(zdp)->z_ctldir != NULL))
    #define zfs_show_ctldir(zdp)    \
            (zfs_has_ctldir(zdp) && \
            (ZTOZSB(zdp)->z_show_ctldir))
    
    extern int zfs_expire_snapshot;
    
    /* zfsctl generic functions */
    extern int zfsctl_create(zfsvfs_t *);
    extern void zfsctl_destroy(zfsvfs_t *);
    extern struct inode *zfsctl_root(znode_t *);
    extern void zfsctl_init(void);
    extern void zfsctl_fini(void);
    extern boolean_t zfsctl_is_node(struct inode *ip);
    extern boolean_t zfsctl_is_snapdir(struct inode *ip);
    extern int zfsctl_fid(struct inode *ip, fid_t *fidp);
    
    /* zfsctl '.zfs' functions */
    extern int zfsctl_root_lookup(struct inode *dip, const char *name,
        struct inode **ipp, int flags, cred_t *cr, int *direntflags,
        pathname_t *realpnp);
    
    /* zfsctl '.zfs/snapshot' functions */
    extern int zfsctl_snapdir_lookup(struct inode *dip, const char *name,
        struct inode **ipp, int flags, cred_t *cr, int *direntflags,
        pathname_t *realpnp);
    extern int zfsctl_snapdir_rename(struct inode *sdip, const char *sname,
        struct inode *tdip, const char *tname, cred_t *cr, int flags);
    extern int zfsctl_snapdir_remove(struct inode *dip, const char *name,
        cred_t *cr, int flags);
    extern int zfsctl_snapdir_mkdir(struct inode *dip, const char *dirname,
        vattr_t *vap, struct inode **ipp, cred_t *cr, int flags);
    extern int zfsctl_snapshot_mount(struct path *path, int flags);
    extern int zfsctl_snapshot_unmount(const char *snapname, int flags);
    extern int zfsctl_snapshot_unmount_delay(spa_t *spa, uint64_t objsetid,
        int delay);
    extern int zfsctl_snapdir_vget(struct super_block *sb, uint64_t objsetid,
        int gen, struct inode **ipp);
    
    /* zfsctl '.zfs/shares' functions */
    extern int zfsctl_shares_lookup(struct inode *dip, char *name,
        struct inode **ipp, int flags, cred_t *cr, int *direntflags,
        pathname_t *realpnp);
    
    /*
     * These inodes numbers are reserved for the .zfs control directory.
     * It is important that they be no larger that 48-bits because only
     * 6 bytes are reserved in the NFS file handle for the object number.
     * However, they should be as large as possible to avoid conflicts
     * with the objects which are assigned monotonically by the dmu.
     */
    #define ZFSCTL_INO_ROOT         0x0000FFFFFFFFFFFFULL
    #define ZFSCTL_INO_SHARES       0x0000FFFFFFFFFFFEULL
    #define ZFSCTL_INO_SNAPDIR      0x0000FFFFFFFFFFFDULL
    #define ZFSCTL_INO_SNAPDIRS     0x0000FFFFFFFFFFFCULL
   
   #define ZFSCTL_EXPIRE_SNAPSHOT  300
   
   #endif  /* _ZFS_CTLDIR_H */

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