200 lines
7.3 KiB
C
200 lines
7.3 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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*/
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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/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/zfs_ioctl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct zfs_sb;
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struct znode;
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typedef struct zfs_sb {
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struct super_block *z_sb; /* generic super_block */
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struct zfs_sb *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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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_atime; /* enable atimes mount option */
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boolean_t z_unmounted; /* unmounted */
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rrwlock_t z_teardown_lock;
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krwlock_t z_teardown_inactive_lock;
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list_t z_all_znodes; /* all vnodes in the fs */
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kmutex_t z_znodes_lock; /* lock for z_all_znodes */
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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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uint64_t z_version; /* ZPL version */
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uint64_t z_shares_dir; /* hidden shares dir */
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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_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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#define ZFS_OBJ_MTX_SZ 64
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kmutex_t z_hold_mtx[ZFS_OBJ_MTX_SZ]; /* znode hold locks */
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} zfs_sb_t;
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#define ZFS_SUPER_MAGIC 0x2fc12fc1
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#define ZSB_XATTR 0x0001 /* Enable user xattrs */
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/*
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* Minimal snapshot helpers, the bulk of the Linux snapshot implementation
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* lives in the zpl_snap.c file which is part of the zpl source.
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*/
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#define ZFS_CTLDIR_NAME ".zfs"
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#define zfs_has_ctldir(zdp) \
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((zdp)->z_id == ZTOZSB(zdp)->z_root && \
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(ZTOZSB(zdp)->z_ctldir != NULL))
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#define zfs_show_ctldir(zdp) \
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(zfs_has_ctldir(zdp) && \
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(ZTOZSB(zdp)->z_show_ctldir))
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#define ZFSCTL_INO_ROOT 0x1
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#define ZFSCTL_INO_SNAPDIR 0x2
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#define ZFSCTL_INO_SHARES 0x3
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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 most Linux filesystems do. It's probably a good idea to limit
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* this to a large value until it is validated that this is safe.
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*/
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#define ZFS_LINK_MAX 65536
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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(zfs_sb_t *zsb);
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extern int zfs_resume_fs(zfs_sb_t *zsb, const char *osname);
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extern int zfs_userspace_one(zfs_sb_t *zsb, 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(zfs_sb_t *zsb, 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(zfs_sb_t *zsb, 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_owner_overquota(zfs_sb_t *zsb, struct znode *,
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boolean_t isgroup);
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extern boolean_t zfs_fuid_overquota(zfs_sb_t *zsb, boolean_t isgroup,
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uint64_t fuid);
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extern int zfs_set_version(zfs_sb_t *zsb, uint64_t newvers);
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extern int zfs_sb_create(const char *name, zfs_sb_t **zsbp);
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extern void zfs_sb_free(zfs_sb_t *zsb);
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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(zfs_sb_t *zsb);
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extern int zfs_register_callbacks(zfs_sb_t *zsb);
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extern void zfs_unregister_callbacks(zfs_sb_t *zsb);
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extern int zfs_domount(struct super_block *sb, void *data, int silent);
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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, char *data);
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extern int zfs_root(zfs_sb_t *zsb, struct inode **ipp);
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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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#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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