FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/linux/zfs/sys/zfs_vfsops_os.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) 2013, 2018 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_FS_ZFS_VFSOPS_H
    #define _SYS_FS_ZFS_VFSOPS_H
    
    #include <sys/dataset_kstats.h>
    #include <sys/isa_defs.h>
    #include <sys/types32.h>
    #include <sys/list.h>
    #include <sys/vfs.h>
    #include <sys/zil.h>
    #include <sys/sa.h>
    #include <sys/rrwlock.h>
    #include <sys/dsl_dataset.h>
    #include <sys/zfs_ioctl.h>
    #include <sys/objlist.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    typedef struct zfsvfs zfsvfs_t;
    struct znode;
    
    /*
     * This structure emulates the vfs_t from other platforms.  It's purpose
     * is to facilitate the handling of mount options and minimize structural
     * differences between the platforms.
     */
    typedef struct vfs {
            struct zfsvfs   *vfs_data;
            char            *vfs_mntpoint;  /* Primary mount point */
            uint64_t        vfs_xattr;
            boolean_t       vfs_readonly;
            boolean_t       vfs_do_readonly;
            boolean_t       vfs_setuid;
            boolean_t       vfs_do_setuid;
            boolean_t       vfs_exec;
            boolean_t       vfs_do_exec;
            boolean_t       vfs_devices;
            boolean_t       vfs_do_devices;
            boolean_t       vfs_do_xattr;
            boolean_t       vfs_atime;
            boolean_t       vfs_do_atime;
            boolean_t       vfs_relatime;
            boolean_t       vfs_do_relatime;
            boolean_t       vfs_nbmand;
            boolean_t       vfs_do_nbmand;
    } vfs_t;
    
    typedef struct zfs_mnt {
            const char      *mnt_osname;    /* Objset name */
            char            *mnt_data;      /* Raw mount options */
    } zfs_mnt_t;
    
    struct zfsvfs {
            vfs_t           *z_vfs;         /* generic fs struct */
            struct super_block *z_sb;       /* generic super_block */
            struct zfsvfs   *z_parent;      /* parent fs */
            objset_t        *z_os;          /* objset reference */
            uint64_t        z_flags;        /* super_block flags */
            uint64_t        z_root;         /* id of root znode */
            uint64_t        z_unlinkedobj;  /* id of unlinked zapobj */
            uint64_t        z_max_blksz;    /* maximum block size for files */
            uint64_t        z_fuid_obj;     /* fuid table object number */
            uint64_t        z_fuid_size;    /* fuid table size */
            avl_tree_t      z_fuid_idx;     /* fuid tree keyed by index */
            avl_tree_t      z_fuid_domain;  /* fuid tree keyed by domain */
            krwlock_t       z_fuid_lock;    /* fuid lock */
            boolean_t       z_fuid_loaded;  /* fuid tables are loaded */
            boolean_t       z_fuid_dirty;   /* need to sync fuid table ? */
            struct zfs_fuid_info    *z_fuid_replay; /* fuid info for replay */
            zilog_t         *z_log;         /* intent log pointer */
            uint_t          z_acl_mode;     /* acl chmod/mode behavior */
            uint_t          z_acl_inherit;  /* acl inheritance behavior */
            uint_t          z_acl_type;     /* type of ACL usable on this FS */
           zfs_case_t      z_case;         /* case-sense */
           boolean_t       z_utf8;         /* utf8-only */
           int             z_norm;         /* normalization flags */
           boolean_t       z_relatime;     /* enable relatime mount option */
           boolean_t       z_unmounted;    /* unmounted */
           rrmlock_t       z_teardown_lock;
           krwlock_t       z_teardown_inactive_lock;
           list_t          z_all_znodes;   /* all znodes in the fs */
           uint64_t        z_nr_znodes;    /* number of znodes in the fs */
           unsigned long   z_rollback_time; /* last online rollback time */
           unsigned long   z_snap_defer_time; /* last snapshot unmount deferral */
           kmutex_t        z_znodes_lock;  /* lock for z_all_znodes */
           arc_prune_t     *z_arc_prune;   /* called by ARC to prune caches */
           struct inode    *z_ctldir;      /* .zfs directory inode */
           boolean_t       z_show_ctldir;  /* expose .zfs in the root dir */
           boolean_t       z_issnap;       /* true if this is a snapshot */
           boolean_t       z_use_fuids;    /* version allows fuids */
           boolean_t       z_replay;       /* set during ZIL replay */
           boolean_t       z_use_sa;       /* version allow system attributes */
           boolean_t       z_xattr_sa;     /* allow xattrs to be stores as SA */
           boolean_t       z_draining;     /* is true when drain is active */
           boolean_t       z_drain_cancel; /* signal the unlinked drain to stop */
           uint64_t        z_version;      /* ZPL version */
           uint64_t        z_shares_dir;   /* hidden shares dir */
           dataset_kstats_t        z_kstat;        /* fs kstats */
           kmutex_t        z_lock;
           uint64_t        z_userquota_obj;
           uint64_t        z_groupquota_obj;
           uint64_t        z_userobjquota_obj;
           uint64_t        z_groupobjquota_obj;
           uint64_t        z_projectquota_obj;
           uint64_t        z_projectobjquota_obj;
           uint64_t        z_replay_eof;   /* New end of file - replay only */
           sa_attr_type_t  *z_attr_table;  /* SA attr mapping->id */
           uint64_t        z_hold_size;    /* znode hold array size */
           avl_tree_t      *z_hold_trees;  /* znode hold trees */
           kmutex_t        *z_hold_locks;  /* znode hold locks */
           taskqid_t       z_drain_task;   /* task id for the unlink drain task */
   };
   
   #define ZFS_TEARDOWN_INIT(zfsvfs)               \
           rrm_init(&(zfsvfs)->z_teardown_lock, B_FALSE)
   
   #define ZFS_TEARDOWN_DESTROY(zfsvfs)            \
           rrm_destroy(&(zfsvfs)->z_teardown_lock)
   
   #define ZFS_TEARDOWN_ENTER_READ(zfsvfs, tag)    \
           rrm_enter_read(&(zfsvfs)->z_teardown_lock, tag);
   
   #define ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag)     \
           rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
   
   #define ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, tag)   \
           rrm_enter(&(zfsvfs)->z_teardown_lock, RW_WRITER, tag)
   
   #define ZFS_TEARDOWN_EXIT_WRITE(zfsvfs)         \
           rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
   
   #define ZFS_TEARDOWN_EXIT(zfsvfs, tag)          \
           rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
   
   #define ZFS_TEARDOWN_READ_HELD(zfsvfs)          \
           RRM_READ_HELD(&(zfsvfs)->z_teardown_lock)
   
   #define ZFS_TEARDOWN_WRITE_HELD(zfsvfs)         \
           RRM_WRITE_HELD(&(zfsvfs)->z_teardown_lock)
   
   #define ZFS_TEARDOWN_HELD(zfsvfs)               \
           RRM_LOCK_HELD(&(zfsvfs)->z_teardown_lock)
   
   #define ZSB_XATTR       0x0001          /* Enable user xattrs */
   
   /*
    * Allow a maximum number of links.  While ZFS does not internally limit
    * this the inode->i_nlink member is defined as an unsigned int.  To be
    * safe we use 2^31-1 as the limit.
    */
   #define ZFS_LINK_MAX            ((1U << 31) - 1U)
   
   /*
    * Normal filesystems (those not under .zfs/snapshot) have a total
    * file ID size limited to 12 bytes (including the length field) due to
    * NFSv2 protocol's limitation of 32 bytes for a filehandle.  For historical
    * reasons, this same limit is being imposed by the Solaris NFSv3 implementation
    * (although the NFSv3 protocol actually permits a maximum of 64 bytes).  It
    * is not possible to expand beyond 12 bytes without abandoning support
    * of NFSv2.
    *
    * For normal filesystems, we partition up the available space as follows:
    *      2 bytes         fid length (required)
    *      6 bytes         object number (48 bits)
    *      4 bytes         generation number (32 bits)
    *
    * We reserve only 48 bits for the object number, as this is the limit
    * currently defined and imposed by the DMU.
    */
   typedef struct zfid_short {
           uint16_t        zf_len;
           uint8_t         zf_object[6];           /* obj[i] = obj >> (8 * i) */
           uint8_t         zf_gen[4];              /* gen[i] = gen >> (8 * i) */
   } zfid_short_t;
   
   /*
    * Filesystems under .zfs/snapshot have a total file ID size of 22 bytes
    * (including the length field).  This makes files under .zfs/snapshot
    * accessible by NFSv3 and NFSv4, but not NFSv2.
    *
    * For files under .zfs/snapshot, we partition up the available space
    * as follows:
    *      2 bytes         fid length (required)
    *      6 bytes         object number (48 bits)
    *      4 bytes         generation number (32 bits)
    *      6 bytes         objset id (48 bits)
    *      4 bytes         currently just zero (32 bits)
    *
    * We reserve only 48 bits for the object number and objset id, as these are
    * the limits currently defined and imposed by the DMU.
    */
   typedef struct zfid_long {
           zfid_short_t    z_fid;
           uint8_t         zf_setid[6];            /* obj[i] = obj >> (8 * i) */
           uint8_t         zf_setgen[4];           /* gen[i] = gen >> (8 * i) */
   } zfid_long_t;
   
   #define SHORT_FID_LEN   (sizeof (zfid_short_t) - sizeof (uint16_t))
   #define LONG_FID_LEN    (sizeof (zfid_long_t) - sizeof (uint16_t))
   
   extern void zfs_init(void);
   extern void zfs_fini(void);
   
   extern int zfs_suspend_fs(zfsvfs_t *zfsvfs);
   extern int zfs_resume_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds);
   extern int zfs_end_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds);
   extern void zfs_exit_fs(zfsvfs_t *zfsvfs);
   extern int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers);
   extern int zfsvfs_create(const char *name, boolean_t readony, zfsvfs_t **zfvp);
   extern int zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os);
   extern void zfsvfs_free(zfsvfs_t *zfsvfs);
   extern int zfs_check_global_label(const char *dsname, const char *hexsl);
   
   extern boolean_t zfs_is_readonly(zfsvfs_t *zfsvfs);
   extern int zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent);
   extern void zfs_preumount(struct super_block *sb);
   extern int zfs_umount(struct super_block *sb);
   extern int zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm);
   extern int zfs_statvfs(struct inode *ip, struct kstatfs *statp);
   extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp);
   extern int zfs_prune(struct super_block *sb, unsigned long nr_to_scan,
       int *objects);
   extern int zfs_get_temporary_prop(dsl_dataset_t *ds, zfs_prop_t zfs_prop,
       uint64_t *val, char *setpoint);
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _SYS_FS_ZFS_VFSOPS_H */

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