/* * 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 #include #include #include #include #include #include #include #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 */ rrmlock_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 */ unsigned long z_snap_defer_time; /* last snapshot unmount deferal */ kmutex_t z_znodes_lock; /* lock for z_all_znodes */ arc_prune_t *z_arc_prune; /* called by ARC to prune caches */ struct inode *z_ctldir; /* .zfs directory inode */ 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; /* 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 */