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Diffstat (limited to 'include/os/linux/zfs/sys/zfs_vfsops.h')
| -rw-r--r-- | include/os/linux/zfs/sys/zfs_vfsops.h | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/include/os/linux/zfs/sys/zfs_vfsops.h b/include/os/linux/zfs/sys/zfs_vfsops.h new file mode 100644 index 000000000..2886d9e25 --- /dev/null +++ b/include/os/linux/zfs/sys/zfs_vfsops.h @@ -0,0 +1,235 @@ +/* + * 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. + * Copyright (c) 2013, 2018 by Delphix. All rights reserved. + */ + +#ifndef _SYS_FS_ZFS_VFSOPS_H +#define _SYS_FS_ZFS_VFSOPS_H + +#include <sys/dataset_kstats.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/dsl_dataset.h> +#include <sys/zfs_ioctl.h> +#include <sys/objlist.h> + +#ifdef __cplusplus +extern "C" { +#endif + +typedef struct zfsvfs zfsvfs_t; +struct znode; + +/* + * This structure emulates the vfs_t from other platforms. It's purpose + * is to facilitate the handling of mount options and minimize structural + * differences between the platforms. + */ +typedef struct vfs { + struct zfsvfs *vfs_data; + char *vfs_mntpoint; /* Primary mount point */ + uint64_t vfs_xattr; + boolean_t vfs_readonly; + boolean_t vfs_do_readonly; + boolean_t vfs_setuid; + boolean_t vfs_do_setuid; + boolean_t vfs_exec; + boolean_t vfs_do_exec; + boolean_t vfs_devices; + boolean_t vfs_do_devices; + boolean_t vfs_do_xattr; + boolean_t vfs_atime; + boolean_t vfs_do_atime; + boolean_t vfs_relatime; + boolean_t vfs_do_relatime; + boolean_t vfs_nbmand; + boolean_t vfs_do_nbmand; +} vfs_t; + +typedef struct zfs_mnt { + const char *mnt_osname; /* Objset name */ + char *mnt_data; /* Raw mount options */ +} zfs_mnt_t; + +struct zfsvfs { + vfs_t *z_vfs; /* generic fs struct */ + struct super_block *z_sb; /* generic super_block */ + struct zfsvfs *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_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 deferral */ + 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 */ + boolean_t z_draining; /* is true when drain is active */ + boolean_t z_drain_cancel; /* signal the unlinked drain to stop */ + uint64_t z_version; /* ZPL version */ + uint64_t z_shares_dir; /* hidden shares dir */ + dataset_kstats_t z_kstat; /* fs kstats */ + kmutex_t z_lock; + uint64_t z_userquota_obj; + uint64_t z_groupquota_obj; + uint64_t z_userobjquota_obj; + uint64_t z_groupobjquota_obj; + uint64_t z_projectquota_obj; + uint64_t z_projectobjquota_obj; + uint64_t z_replay_eof; /* New end of file - replay only */ + sa_attr_type_t *z_attr_table; /* SA attr mapping->id */ + uint64_t z_hold_size; /* znode hold array size */ + avl_tree_t *z_hold_trees; /* znode hold trees */ + kmutex_t *z_hold_locks; /* znode hold locks */ + taskqid_t z_drain_task; /* task id for the unlink drain task */ +}; + +#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(zfsvfs_t *zfsvfs); +extern int zfs_resume_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds); +extern int zfs_end_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds); +extern int zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, + const char *domain, uint64_t rid, uint64_t *valuep); +extern int zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, + uint64_t *cookiep, void *vbuf, uint64_t *bufsizep); +extern int zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, + const char *domain, uint64_t rid, uint64_t quota); +extern boolean_t zfs_id_overblockquota(zfsvfs_t *zfsvfs, uint64_t usedobj, + uint64_t id); +extern boolean_t zfs_id_overobjquota(zfsvfs_t *zfsvfs, uint64_t usedobj, + uint64_t id); +extern boolean_t zfs_id_overquota(zfsvfs_t *zfsvfs, uint64_t usedobj, + uint64_t id); +extern int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers); +extern int zfsvfs_create(const char *name, boolean_t readony, zfsvfs_t **zfvp); +extern int zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os); +extern void zfsvfs_free(zfsvfs_t *zfsvfs); +extern int zfs_check_global_label(const char *dsname, const char *hexsl); +extern objlist_t *zfs_get_deleteq(objset_t *os); + +extern boolean_t zfs_is_readonly(zfsvfs_t *zfsvfs); +extern int zfs_domount(struct super_block *sb, zfs_mnt_t *zm, 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, zfs_mnt_t *zm); +extern int zfs_statvfs(struct dentry *dentry, struct kstatfs *statp); +extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp); +extern int zfs_prune(struct super_block *sb, unsigned long nr_to_scan, + int *objects); + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_FS_ZFS_VFSOPS_H */ |