FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/zfs/sys/zfs_znode_impl.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) 2012, 2015 by Delphix. All rights reserved.
     * Copyright (c) 2014 Integros [integros.com]
     * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
     */
    
    #ifndef _FREEBSD_ZFS_SYS_ZNODE_IMPL_H
    #define _FREEBSD_ZFS_SYS_ZNODE_IMPL_H
    
    #include <sys/list.h>
    #include <sys/dmu.h>
    #include <sys/sa.h>
    #include <sys/zfs_vfsops.h>
    #include <sys/rrwlock.h>
    #include <sys/zfs_sa.h>
    #include <sys/zfs_stat.h>
    #include <sys/zfs_rlock.h>
    #include <sys/zfs_acl.h>
    #include <sys/zil.h>
    #include <sys/zfs_project.h>
    #include <vm/vm_object.h>
    #include <sys/uio.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * Directory entry locks control access to directory entries.
     * They are used to protect creates, deletes, and renames.
     * Each directory znode has a mutex and a list of locked names.
     */
    #define ZNODE_OS_FIELDS                 \
            struct zfsvfs   *z_zfsvfs;      \
            vnode_t         *z_vnode;       \
            char            *z_cached_symlink;      \
            uint64_t                z_uid;          \
            uint64_t                z_gid;          \
            uint64_t                z_gen;          \
            uint64_t                z_atime[2];     \
            uint64_t                z_links;
    
    #define ZFS_LINK_MAX    UINT64_MAX
    
    /*
     * ZFS minor numbers can refer to either a control device instance or
     * a zvol. Depending on the value of zss_type, zss_data points to either
     * a zvol_state_t or a zfs_onexit_t.
     */
    enum zfs_soft_state_type {
            ZSST_ZVOL,
            ZSST_CTLDEV
    };
    
    typedef struct zfs_soft_state {
            enum zfs_soft_state_type zss_type;
            void *zss_data;
    } zfs_soft_state_t;
    
    /*
     * Range locking rules
     * --------------------
     * 1. When truncating a file (zfs_create, zfs_setattr, zfs_space) the whole
     *    file range needs to be locked as RL_WRITER. Only then can the pages be
     *    freed etc and zp_size reset. zp_size must be set within range lock.
     * 2. For writes and punching holes (zfs_write & zfs_space) just the range
     *    being written or freed needs to be locked as RL_WRITER.
     *    Multiple writes at the end of the file must coordinate zp_size updates
     *    to ensure data isn't lost. A compare and swap loop is currently used
     *    to ensure the file size is at least the offset last written.
     * 3. For reads (zfs_read, zfs_get_data & zfs_putapage) just the range being
     *    read needs to be locked as RL_READER. A check against zp_size can then
     *    be made for reading beyond end of file.
     */
    
    /*
     * Convert between znode pointers and vnode pointers
     */
   #define ZTOV(ZP)        ((ZP)->z_vnode)
   #define ZTOI(ZP)        ((ZP)->z_vnode)
   #define VTOZ(VP)        ((struct znode *)(VP)->v_data)
   #define VTOZ_SMR(VP)    ((znode_t *)vn_load_v_data_smr(VP))
   #define ITOZ(VP)        ((struct znode *)(VP)->v_data)
   #define zhold(zp)       vhold(ZTOV((zp)))
   #define zrele(zp)       vrele(ZTOV((zp)))
   
   #define ZTOZSB(zp) ((zp)->z_zfsvfs)
   #define ITOZSB(vp) (VTOZ(vp)->z_zfsvfs)
   #define ZTOTYPE(zp)     (ZTOV(zp)->v_type)
   #define ZTOGID(zp) ((zp)->z_gid)
   #define ZTOUID(zp) ((zp)->z_uid)
   #define ZTONLNK(zp) ((zp)->z_links)
   #define Z_ISBLK(type) ((type) == VBLK)
   #define Z_ISCHR(type) ((type) == VCHR)
   #define Z_ISLNK(type) ((type) == VLNK)
   #define Z_ISDIR(type) ((type) == VDIR)
   
   #define zn_has_cached_data(zp)          vn_has_cached_data(ZTOV(zp))
   #define zn_flush_cached_data(zp, sync)  vn_flush_cached_data(ZTOV(zp), sync)
   #define zn_rlimit_fsize(zp, uio) \
       vn_rlimit_fsize(ZTOV(zp), GET_UIO_STRUCT(uio), zfs_uio_td(uio))
   
   /* Called on entry to each ZFS vnode and vfs operation  */
   static inline int
   zfs_enter(zfsvfs_t *zfsvfs, const char *tag)
   {
           ZFS_TEARDOWN_ENTER_READ(zfsvfs, tag);
           if (__predict_false((zfsvfs)->z_unmounted)) {
                   ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag);
                   return (SET_ERROR(EIO));
           }
           return (0);
   }
   
   /* Must be called before exiting the vop */
   static inline void
   zfs_exit(zfsvfs_t *zfsvfs, const char *tag)
   {
           ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag);
   }
   
   /*
    * Macros for dealing with dmu_buf_hold
    */
   #define ZFS_OBJ_HASH(obj_num)   ((obj_num) & (ZFS_OBJ_MTX_SZ - 1))
   #define ZFS_OBJ_MUTEX(zfsvfs, obj_num)  \
           (&(zfsvfs)->z_hold_mtx[ZFS_OBJ_HASH(obj_num)])
   #define ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num) \
           mutex_enter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num)))
   #define ZFS_OBJ_HOLD_TRYENTER(zfsvfs, obj_num) \
           mutex_tryenter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num)))
   #define ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num) \
           mutex_exit(ZFS_OBJ_MUTEX((zfsvfs), (obj_num)))
   
   /* Encode ZFS stored time values from a struct timespec */
   #define ZFS_TIME_ENCODE(tp, stmp)               \
   {                                               \
           (stmp)[0] = (uint64_t)(tp)->tv_sec;     \
           (stmp)[1] = (uint64_t)(tp)->tv_nsec;    \
   }
   
   /* Decode ZFS stored time values to a struct timespec */
   #define ZFS_TIME_DECODE(tp, stmp)               \
   {                                               \
           (tp)->tv_sec = (time_t)(stmp)[0];               \
           (tp)->tv_nsec = (long)(stmp)[1];                \
   }
   #define ZFS_ACCESSTIME_STAMP(zfsvfs, zp) \
           if ((zfsvfs)->z_atime && !((zfsvfs)->z_vfs->vfs_flag & VFS_RDONLY)) \
                   zfs_tstamp_update_setup_ext(zp, ACCESSED, NULL, NULL, B_FALSE);
   
   extern void     zfs_tstamp_update_setup_ext(struct znode *,
       uint_t, uint64_t [2], uint64_t [2], boolean_t have_tx);
   extern void zfs_znode_free(struct znode *);
   
   extern zil_replay_func_t *const zfs_replay_vector[TX_MAX_TYPE];
   
   extern int zfs_znode_parent_and_name(struct znode *zp, struct znode **dzpp,
       char *buf);
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _FREEBSD_SYS_FS_ZFS_ZNODE_H */

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