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