233 lines
8.7 KiB
C
233 lines
8.7 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) 2013, 2018 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_FS_ZFS_VFSOPS_H
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#define _SYS_FS_ZFS_VFSOPS_H
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#include <sys/dataset_kstats.h>
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#include <sys/isa_defs.h>
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#include <sys/types32.h>
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#include <sys/list.h>
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#include <sys/vfs.h>
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#include <sys/zil.h>
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#include <sys/sa.h>
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#include <sys/rrwlock.h>
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#include <sys/dsl_dataset.h>
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#include <sys/zfs_ioctl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct zfsvfs zfsvfs_t;
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struct znode;
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/*
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* This structure emulates the vfs_t from other platforms. It's purpose
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* is to faciliate the handling of mount options and minimize structural
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* differences between the platforms.
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*/
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typedef struct vfs {
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struct zfsvfs *vfs_data;
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char *vfs_mntpoint; /* Primary mount point */
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uint64_t vfs_xattr;
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boolean_t vfs_readonly;
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boolean_t vfs_do_readonly;
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boolean_t vfs_setuid;
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boolean_t vfs_do_setuid;
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boolean_t vfs_exec;
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boolean_t vfs_do_exec;
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boolean_t vfs_devices;
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boolean_t vfs_do_devices;
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boolean_t vfs_do_xattr;
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boolean_t vfs_atime;
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boolean_t vfs_do_atime;
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boolean_t vfs_relatime;
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boolean_t vfs_do_relatime;
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boolean_t vfs_nbmand;
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boolean_t vfs_do_nbmand;
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} vfs_t;
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typedef struct zfs_mnt {
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const char *mnt_osname; /* Objset name */
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char *mnt_data; /* Raw mount options */
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} zfs_mnt_t;
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struct zfsvfs {
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vfs_t *z_vfs; /* generic fs struct */
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struct super_block *z_sb; /* generic super_block */
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struct zfsvfs *z_parent; /* parent fs */
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objset_t *z_os; /* objset reference */
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uint64_t z_flags; /* super_block flags */
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uint64_t z_root; /* id of root znode */
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uint64_t z_unlinkedobj; /* id of unlinked zapobj */
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uint64_t z_max_blksz; /* maximum block size for files */
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uint64_t z_fuid_obj; /* fuid table object number */
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uint64_t z_fuid_size; /* fuid table size */
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avl_tree_t z_fuid_idx; /* fuid tree keyed by index */
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avl_tree_t z_fuid_domain; /* fuid tree keyed by domain */
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krwlock_t z_fuid_lock; /* fuid lock */
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boolean_t z_fuid_loaded; /* fuid tables are loaded */
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boolean_t z_fuid_dirty; /* need to sync fuid table ? */
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struct zfs_fuid_info *z_fuid_replay; /* fuid info for replay */
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zilog_t *z_log; /* intent log pointer */
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uint_t z_acl_inherit; /* acl inheritance behavior */
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uint_t z_acl_type; /* type of ACL usable on this FS */
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zfs_case_t z_case; /* case-sense */
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boolean_t z_utf8; /* utf8-only */
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int z_norm; /* normalization flags */
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boolean_t z_relatime; /* enable relatime mount option */
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boolean_t z_unmounted; /* unmounted */
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rrmlock_t z_teardown_lock;
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krwlock_t z_teardown_inactive_lock;
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list_t z_all_znodes; /* all znodes in the fs */
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uint64_t z_nr_znodes; /* number of znodes in the fs */
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unsigned long z_rollback_time; /* last online rollback time */
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unsigned long z_snap_defer_time; /* last snapshot unmount deferal */
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kmutex_t z_znodes_lock; /* lock for z_all_znodes */
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arc_prune_t *z_arc_prune; /* called by ARC to prune caches */
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struct inode *z_ctldir; /* .zfs directory inode */
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boolean_t z_show_ctldir; /* expose .zfs in the root dir */
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boolean_t z_issnap; /* true if this is a snapshot */
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boolean_t z_vscan; /* virus scan on/off */
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boolean_t z_use_fuids; /* version allows fuids */
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boolean_t z_replay; /* set during ZIL replay */
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boolean_t z_use_sa; /* version allow system attributes */
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boolean_t z_xattr_sa; /* allow xattrs to be stores as SA */
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boolean_t z_draining; /* is true when drain is active */
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boolean_t z_drain_cancel; /* signal the unlinked drain to stop */
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uint64_t z_version; /* ZPL version */
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uint64_t z_shares_dir; /* hidden shares dir */
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dataset_kstats_t z_kstat; /* fs kstats */
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kmutex_t z_lock;
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uint64_t z_userquota_obj;
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uint64_t z_groupquota_obj;
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uint64_t z_userobjquota_obj;
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uint64_t z_groupobjquota_obj;
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uint64_t z_projectquota_obj;
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uint64_t z_projectobjquota_obj;
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uint64_t z_replay_eof; /* New end of file - replay only */
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sa_attr_type_t *z_attr_table; /* SA attr mapping->id */
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uint64_t z_hold_size; /* znode hold array size */
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avl_tree_t *z_hold_trees; /* znode hold trees */
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kmutex_t *z_hold_locks; /* znode hold locks */
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taskqid_t z_drain_task; /* task id for the unlink drain task */
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};
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#define ZSB_XATTR 0x0001 /* Enable user xattrs */
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/*
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* Allow a maximum number of links. While ZFS does not internally limit
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* this the inode->i_nlink member is defined as an unsigned int. To be
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* safe we use 2^31-1 as the limit.
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*/
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#define ZFS_LINK_MAX ((1U << 31) - 1U)
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/*
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* Normal filesystems (those not under .zfs/snapshot) have a total
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* file ID size limited to 12 bytes (including the length field) due to
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* NFSv2 protocol's limitation of 32 bytes for a filehandle. For historical
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* reasons, this same limit is being imposed by the Solaris NFSv3 implementation
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* (although the NFSv3 protocol actually permits a maximum of 64 bytes). It
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* is not possible to expand beyond 12 bytes without abandoning support
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* of NFSv2.
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*
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* For normal filesystems, we partition up the available space as follows:
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* 2 bytes fid length (required)
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* 6 bytes object number (48 bits)
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* 4 bytes generation number (32 bits)
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*
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* We reserve only 48 bits for the object number, as this is the limit
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* currently defined and imposed by the DMU.
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*/
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typedef struct zfid_short {
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uint16_t zf_len;
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uint8_t zf_object[6]; /* obj[i] = obj >> (8 * i) */
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uint8_t zf_gen[4]; /* gen[i] = gen >> (8 * i) */
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} zfid_short_t;
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/*
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* Filesystems under .zfs/snapshot have a total file ID size of 22 bytes
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* (including the length field). This makes files under .zfs/snapshot
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* accessible by NFSv3 and NFSv4, but not NFSv2.
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*
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* For files under .zfs/snapshot, we partition up the available space
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* as follows:
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* 2 bytes fid length (required)
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* 6 bytes object number (48 bits)
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* 4 bytes generation number (32 bits)
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* 6 bytes objset id (48 bits)
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* 4 bytes currently just zero (32 bits)
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*
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* We reserve only 48 bits for the object number and objset id, as these are
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* the limits currently defined and imposed by the DMU.
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*/
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typedef struct zfid_long {
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zfid_short_t z_fid;
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uint8_t zf_setid[6]; /* obj[i] = obj >> (8 * i) */
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uint8_t zf_setgen[4]; /* gen[i] = gen >> (8 * i) */
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} zfid_long_t;
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#define SHORT_FID_LEN (sizeof (zfid_short_t) - sizeof (uint16_t))
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#define LONG_FID_LEN (sizeof (zfid_long_t) - sizeof (uint16_t))
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extern uint_t zfs_fsyncer_key;
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extern int zfs_suspend_fs(zfsvfs_t *zfsvfs);
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extern int zfs_resume_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds);
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extern int zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
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const char *domain, uint64_t rid, uint64_t *valuep);
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extern int zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
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uint64_t *cookiep, void *vbuf, uint64_t *bufsizep);
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extern int zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
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const char *domain, uint64_t rid, uint64_t quota);
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extern boolean_t zfs_id_overblockquota(zfsvfs_t *zfsvfs, uint64_t usedobj,
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uint64_t id);
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extern boolean_t zfs_id_overobjquota(zfsvfs_t *zfsvfs, uint64_t usedobj,
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uint64_t id);
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extern boolean_t zfs_id_overquota(zfsvfs_t *zfsvfs, uint64_t usedobj,
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uint64_t id);
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extern int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers);
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extern int zfsvfs_create(const char *name, boolean_t readony, zfsvfs_t **zfvp);
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extern int zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os);
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extern void zfsvfs_free(zfsvfs_t *zfsvfs);
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extern int zfs_check_global_label(const char *dsname, const char *hexsl);
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extern boolean_t zfs_is_readonly(zfsvfs_t *zfsvfs);
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extern int zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent);
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extern void zfs_preumount(struct super_block *sb);
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extern int zfs_umount(struct super_block *sb);
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extern int zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm);
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extern int zfs_statvfs(struct dentry *dentry, struct kstatfs *statp);
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extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp);
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extern int zfs_prune(struct super_block *sb, unsigned long nr_to_scan,
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int *objects);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_FS_ZFS_VFSOPS_H */
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