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zfs/include/sys/zfs_vfsops.h

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/*
* 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 http://www.opensolaris.org/os/licensing.
* 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.
*/
#ifndef _SYS_FS_ZFS_VFSOPS_H
#define _SYS_FS_ZFS_VFSOPS_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/zfs_ioctl.h>
#ifdef __cplusplus
extern "C" {
#endif
struct zfs_sb;
struct znode;
typedef struct zfs_sb {
struct super_block *z_sb; /* generic super_block */
struct backing_dev_info z_bdi; /* generic backing dev info */
struct zfs_sb *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_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_atime; /* enable atimes mount option */
boolean_t z_relatime; /* enable relatime mount option */
boolean_t z_unmounted; /* unmounted */
rrwlock_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 */
kmutex_t z_znodes_lock; /* lock for z_all_znodes */
struct inode *z_ctldir; /* .zfs directory inode */
avl_tree_t z_ctldir_snaps; /* .zfs/snapshot entries */
kmutex_t z_ctldir_lock; /* .zfs ctldir lock */
boolean_t z_show_ctldir; /* expose .zfs in the root dir */
boolean_t z_issnap; /* true if this is a snapshot */
boolean_t z_vscan; /* virus scan on/off */
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 */
uint64_t z_version; /* ZPL version */
uint64_t z_shares_dir; /* hidden shares dir */
kmutex_t z_lock;
uint64_t z_userquota_obj;
uint64_t z_groupquota_obj;
uint64_t z_replay_eof; /* New end of file - replay only */
sa_attr_type_t *z_attr_table; /* SA attr mapping->id */
#define ZFS_OBJ_MTX_SZ 256
kmutex_t z_hold_mtx[ZFS_OBJ_MTX_SZ]; /* znode hold locks */
} zfs_sb_t;
#define ZFS_SUPER_MAGIC 0x2fc12fc1
#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 uint_t zfs_fsyncer_key;
extern int zfs_suspend_fs(zfs_sb_t *zsb);
extern int zfs_resume_fs(zfs_sb_t *zsb, const char *osname);
extern int zfs_userspace_one(zfs_sb_t *zsb, zfs_userquota_prop_t type,
const char *domain, uint64_t rid, uint64_t *valuep);
extern int zfs_userspace_many(zfs_sb_t *zsb, zfs_userquota_prop_t type,
uint64_t *cookiep, void *vbuf, uint64_t *bufsizep);
extern int zfs_set_userquota(zfs_sb_t *zsb, zfs_userquota_prop_t type,
const char *domain, uint64_t rid, uint64_t quota);
extern boolean_t zfs_owner_overquota(zfs_sb_t *zsb, struct znode *,
boolean_t isgroup);
extern boolean_t zfs_fuid_overquota(zfs_sb_t *zsb, boolean_t isgroup,
uint64_t fuid);
extern int zfs_set_version(zfs_sb_t *zsb, uint64_t newvers);
extern int zfs_get_zplprop(objset_t *os, zfs_prop_t prop,
uint64_t *value);
extern int zfs_sb_create(const char *name, zfs_sb_t **zsbp);
extern int zfs_sb_setup(zfs_sb_t *zsb, boolean_t mounting);
extern void zfs_sb_free(zfs_sb_t *zsb);
extern int zfs_sb_prune(struct super_block *sb, unsigned long nr_to_scan,
int *objects);
extern int zfs_sb_teardown(zfs_sb_t *zsb, boolean_t unmounting);
extern int zfs_check_global_label(const char *dsname, const char *hexsl);
extern boolean_t zfs_is_readonly(zfs_sb_t *zsb);
extern int zfs_register_callbacks(zfs_sb_t *zsb);
extern void zfs_unregister_callbacks(zfs_sb_t *zsb);
extern int zfs_domount(struct super_block *sb, void *data, 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, char *data);
extern int zfs_root(zfs_sb_t *zsb, struct inode **ipp);
extern int zfs_statvfs(struct dentry *dentry, struct kstatfs *statp);
extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp);
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_ZFS_VFSOPS_H */
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