Merge commit '7e3488dc6cdcb0c04e1ce167a1a3bfef83b5f2e0'

[unleashed.git] / kernel / fs / zfs / sys / zfs_ioctl.h

/*
 * 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) 2011-2012 Pawel Jakub Dawidek. All rights reserved.
 * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
 * Copyright 2016 RackTop Systems.
 * Copyright (c) 2014 Integros [integros.com]
 */

#ifndef _SYS_ZFS_IOCTL_H
#define _SYS_ZFS_IOCTL_H

#include <sys/cred.h>
#include <sys/dmu.h>
#include <sys/zio.h>
#include <sys/dsl_deleg.h>
#include <sys/spa.h>
#include <sys/zfs_stat.h>

#ifdef _KERNEL
#include <sys/nvpair.h>
#endif  /* _KERNEL */

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * The structures in this file are passed between userland and the
 * kernel.  Userland may be running a 32-bit process, while the kernel
 * is 64-bit.  Therefore, these structures need to compile the same in
 * 32-bit and 64-bit.  This means not using type "long", and adding
 * explicit padding so that the 32-bit structure will not be packed more
 * tightly than the 64-bit structure (which requires 64-bit alignment).
 */

/*
 * Property values for snapdir
 */
#define ZFS_SNAPDIR_HIDDEN              0
#define ZFS_SNAPDIR_VISIBLE             1

/*
 * Field manipulation macros for the drr_versioninfo field of the
 * send stream header.
 */

/*
 * Header types for zfs send streams.
 */
typedef enum drr_headertype {
        DMU_SUBSTREAM = 0x1,
        DMU_COMPOUNDSTREAM = 0x2
} drr_headertype_t;

#define DMU_GET_STREAM_HDRTYPE(vi)      BF64_GET((vi), 0, 2)
#define DMU_SET_STREAM_HDRTYPE(vi, x)   BF64_SET((vi), 0, 2, x)

#define DMU_GET_FEATUREFLAGS(vi)        BF64_GET((vi), 2, 30)
#define DMU_SET_FEATUREFLAGS(vi, x)     BF64_SET((vi), 2, 30, x)

/*
 * Feature flags for zfs send streams (flags in drr_versioninfo)
 */

#define DMU_BACKUP_FEATURE_DEDUP                (1 << 0)
#define DMU_BACKUP_FEATURE_DEDUPPROPS           (1 << 1)
#define DMU_BACKUP_FEATURE_SA_SPILL             (1 << 2)
/* flags #3 - #15 are reserved for incompatible closed-source implementations */
#define DMU_BACKUP_FEATURE_EMBED_DATA           (1 << 16)
#define DMU_BACKUP_FEATURE_LZ4                  (1 << 17)
/* flag #18 is reserved for a Delphix feature */
#define DMU_BACKUP_FEATURE_LARGE_BLOCKS         (1 << 19)
#define DMU_BACKUP_FEATURE_RESUMING             (1 << 20)
/* flag #21 is reserved for a Delphix feature */
#define DMU_BACKUP_FEATURE_COMPRESSED           (1 << 22)
/* flag #23 is reserved for the large dnode feature */
/* flag #24 is reserved for the raw send feature */
/* flag #25 is reserved for the ZSTD compression feature */

/*
 * Mask of all supported backup features
 */
#define DMU_BACKUP_FEATURE_MASK (DMU_BACKUP_FEATURE_DEDUP | \
    DMU_BACKUP_FEATURE_DEDUPPROPS | DMU_BACKUP_FEATURE_SA_SPILL | \
    DMU_BACKUP_FEATURE_EMBED_DATA | DMU_BACKUP_FEATURE_LZ4 | \
    DMU_BACKUP_FEATURE_RESUMING | \
    DMU_BACKUP_FEATURE_LARGE_BLOCKS | \
    DMU_BACKUP_FEATURE_COMPRESSED)

/* Are all features in the given flag word currently supported? */
#define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK))

typedef enum dmu_send_resume_token_version {
        ZFS_SEND_RESUME_TOKEN_VERSION = 1
} dmu_send_resume_token_version_t;

/*
 * The drr_versioninfo field of the dmu_replay_record has the
 * following layout:
 *
 *      64      56      48      40      32      24      16      8       0
 *      +-------+-------+-------+-------+-------+-------+-------+-------+
 *      |               reserved        |        feature-flags      |C|S|
 *      +-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * The low order two bits indicate the header type: SUBSTREAM (0x1)
 * or COMPOUNDSTREAM (0x2).  Using two bits for this is historical:
 * this field used to be a version number, where the two version types
 * were 1 and 2.  Using two bits for this allows earlier versions of
 * the code to be able to recognize send streams that don't use any
 * of the features indicated by feature flags.
 */

#define DMU_BACKUP_MAGIC 0x2F5bacbacULL

/*
 * Send stream flags.  Bits 24-31 are reserved for vendor-specific
 * implementations and should not be used.
 */
#define DRR_FLAG_CLONE          (1<<0)
#define DRR_FLAG_CI_DATA        (1<<1)
/*
 * This send stream, if it is a full send, includes the FREE and FREEOBJECT
 * records that are created by the sending process.  This means that the send
 * stream can be received as a clone, even though it is not an incremental.
 * This is not implemented as a feature flag, because the receiving side does
 * not need to have implemented it to receive this stream; it is fully backwards
 * compatible.  We need a flag, though, because full send streams without it
 * cannot necessarily be received as a clone correctly.
 */
#define DRR_FLAG_FREERECORDS    (1<<2)

/*
 * flags in the drr_checksumflags field in the DRR_WRITE and
 * DRR_WRITE_BYREF blocks
 */
#define DRR_CHECKSUM_DEDUP      (1<<0)

#define DRR_IS_DEDUP_CAPABLE(flags)     ((flags) & DRR_CHECKSUM_DEDUP)

/* deal with compressed drr_write replay records */
#define DRR_WRITE_COMPRESSED(drrw)      ((drrw)->drr_compressiontype != 0)
#define DRR_WRITE_PAYLOAD_SIZE(drrw) \
        (DRR_WRITE_COMPRESSED(drrw) ? (drrw)->drr_compressed_size : \
        (drrw)->drr_logical_size)

/*
 * zfs ioctl command structure
 */
typedef struct dmu_replay_record {
        enum {
                DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS,
                DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF,
                DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_NUMTYPES
        } drr_type;
        uint32_t drr_payloadlen;
        union {
                struct drr_begin {
                        uint64_t drr_magic;
                        uint64_t drr_versioninfo; /* was drr_version */
                        uint64_t drr_creation_time;
                        dmu_objset_type_t drr_type;
                        uint32_t drr_flags;
                        uint64_t drr_toguid;
                        uint64_t drr_fromguid;
                        char drr_toname[MAXNAMELEN];
                } drr_begin;
                struct drr_end {
                        zio_cksum_t drr_checksum;
                        uint64_t drr_toguid;
                } drr_end;
                struct drr_object {
                        uint64_t drr_object;
                        dmu_object_type_t drr_type;
                        dmu_object_type_t drr_bonustype;
                        uint32_t drr_blksz;
                        uint32_t drr_bonuslen;
                        uint8_t drr_checksumtype;
                        uint8_t drr_compress;
                        uint8_t drr_pad[6];
                        uint64_t drr_toguid;
                        /* bonus content follows */
                } drr_object;
                struct drr_freeobjects {
                        uint64_t drr_firstobj;
                        uint64_t drr_numobjs;
                        uint64_t drr_toguid;
                } drr_freeobjects;
                struct drr_write {
                        uint64_t drr_object;
                        dmu_object_type_t drr_type;
                        uint32_t drr_pad;
                        uint64_t drr_offset;
                        uint64_t drr_logical_size;
                        uint64_t drr_toguid;
                        uint8_t drr_checksumtype;
                        uint8_t drr_checksumflags;
                        uint8_t drr_compressiontype;
                        uint8_t drr_pad2[5];
                        /* deduplication key */
                        ddt_key_t drr_key;
                        /* only nonzero if drr_compressiontype is not 0 */
                        uint64_t drr_compressed_size;
                        /* content follows */
                } drr_write;
                struct drr_free {
                        uint64_t drr_object;
                        uint64_t drr_offset;
                        uint64_t drr_length;
                        uint64_t drr_toguid;
                } drr_free;
                struct drr_write_byref {
                        /* where to put the data */
                        uint64_t drr_object;
                        uint64_t drr_offset;
                        uint64_t drr_length;
                        uint64_t drr_toguid;
                        /* where to find the prior copy of the data */
                        uint64_t drr_refguid;
                        uint64_t drr_refobject;
                        uint64_t drr_refoffset;
                        /* properties of the data */
                        uint8_t drr_checksumtype;
                        uint8_t drr_checksumflags;
                        uint8_t drr_pad2[6];
                        ddt_key_t drr_key; /* deduplication key */
                } drr_write_byref;
                struct drr_spill {
                        uint64_t drr_object;
                        uint64_t drr_length;
                        uint64_t drr_toguid;
                        uint64_t drr_pad[4]; /* needed for crypto */
                        /* spill data follows */
                } drr_spill;
                struct drr_write_embedded {
                        uint64_t drr_object;
                        uint64_t drr_offset;
                        /* logical length, should equal blocksize */
                        uint64_t drr_length;
                        uint64_t drr_toguid;
                        uint8_t drr_compression;
                        uint8_t drr_etype;
                        uint8_t drr_pad[6];
                        uint32_t drr_lsize; /* uncompressed size of payload */
                        uint32_t drr_psize; /* compr. (real) size of payload */
                        /* (possibly compressed) content follows */
                } drr_write_embedded;

                /*
                 * Nore: drr_checksum is overlaid with all record types
                 * except DRR_BEGIN.  Therefore its (non-pad) members
                 * must not overlap with members from the other structs.
                 * We accomplish this by putting its members at the very
                 * end of the struct.
                 */
                struct drr_checksum {
                        uint64_t drr_pad[34];
                        /*
                         * fletcher-4 checksum of everything preceding the
                         * checksum.
                         */
                        zio_cksum_t drr_checksum;
                } drr_checksum;
        } drr_u;
} dmu_replay_record_t;

/* diff record range types */
typedef enum diff_type {
        DDR_NONE = 0x1,
        DDR_INUSE = 0x2,
        DDR_FREE = 0x4
} diff_type_t;

/*
 * The diff reports back ranges of free or in-use objects.
 */
typedef struct dmu_diff_record {
        uint64_t ddr_type;
        uint64_t ddr_first;
        uint64_t ddr_last;
} dmu_diff_record_t;

typedef struct zinject_record {
        uint64_t        zi_objset;
        uint64_t        zi_object;
        uint64_t        zi_start;
        uint64_t        zi_end;
        uint64_t        zi_guid;
        uint32_t        zi_level;
        uint32_t        zi_error;
        uint64_t        zi_type;
        uint32_t        zi_freq;
        uint32_t        zi_failfast;
        char            zi_func[MAXNAMELEN];
        uint32_t        zi_iotype;
        int32_t         zi_duration;
        uint64_t        zi_timer;
        uint64_t        zi_nlanes;
        uint32_t        zi_cmd;
        uint32_t        zi_pad;
} zinject_record_t;

#define ZINJECT_NULL            0x1
#define ZINJECT_FLUSH_ARC       0x2
#define ZINJECT_UNLOAD_SPA      0x4

typedef enum zinject_type {
        ZINJECT_UNINITIALIZED,
        ZINJECT_DATA_FAULT,
        ZINJECT_DEVICE_FAULT,
        ZINJECT_LABEL_FAULT,
        ZINJECT_IGNORED_WRITES,
        ZINJECT_PANIC,
        ZINJECT_DELAY_IO,
} zinject_type_t;

typedef struct zfs_share {
        uint64_t        z_exportdata;
        uint64_t        z_sharedata;
        uint64_t        z_sharetype;    /* 0 = share, 1 = unshare */
        uint64_t        z_sharemax;  /* max length of share string */
} zfs_share_t;

/*
 * ZFS file systems may behave the usual, POSIX-compliant way, where
 * name lookups are case-sensitive.  They may also be set up so that
 * all the name lookups are case-insensitive, or so that only some
 * lookups, the ones that set an FIGNORECASE flag, are case-insensitive.
 */
typedef enum zfs_case {
        ZFS_CASE_SENSITIVE,
        ZFS_CASE_INSENSITIVE,
        ZFS_CASE_MIXED
} zfs_case_t;

/*
 * Note: this struct must have the same layout in 32-bit and 64-bit, so
 * that 32-bit processes (like /sbin/zfs) can pass it to the 64-bit
 * kernel.  Therefore, we add padding to it so that no "hidden" padding
 * is automatically added on 64-bit (but not on 32-bit).
 */
typedef struct zfs_cmd {
        char            zc_name[MAXPATHLEN];    /* name of pool or dataset */
        uint64_t        zc_nvlist_src;          /* really (char *) */
        uint64_t        zc_nvlist_src_size;
        uint64_t        zc_nvlist_dst;          /* really (char *) */
        uint64_t        zc_nvlist_dst_size;
        boolean_t       zc_nvlist_dst_filled;   /* put an nvlist in dst? */
        int             zc_pad2;

        /*
         * The following members are for legacy ioctls which haven't been
         * converted to the new method.
         */
        uint64_t        zc_history;             /* really (char *) */
        char            zc_value[MAXPATHLEN * 2];
        char            zc_string[MAXNAMELEN];
        uint64_t        zc_guid;
        uint64_t        zc_nvlist_conf;         /* really (char *) */
        uint64_t        zc_nvlist_conf_size;
        uint64_t        zc_cookie;
        uint64_t        zc_objset_type;
        uint64_t        zc_perm_action;
        uint64_t        zc_history_len;
        uint64_t        zc_history_offset;
        uint64_t        zc_obj;
        uint64_t        zc_iflags;              /* internal to zfs(7fs) */
        zfs_share_t     zc_share;
        dmu_objset_stats_t zc_objset_stats;
        dmu_replay_record_t zc_begin_record;
        zinject_record_t zc_inject_record;
        uint32_t        zc_defer_destroy;
        uint32_t        zc_flags;
        uint64_t        zc_action_handle;
        int             zc_cleanup_fd;
        uint8_t         zc_simple;
        uint8_t         zc_pad3[3];
        boolean_t       zc_resumable;
        uint32_t        zc_pad4;
        uint64_t        zc_sendobj;
        uint64_t        zc_fromobj;
        uint64_t        zc_createtxg;
        zfs_stat_t      zc_stat;
} zfs_cmd_t;

typedef struct zfs_useracct {
        char zu_domain[256];
        uid_t zu_rid;
        uint32_t zu_pad;
        uint64_t zu_space;
} zfs_useracct_t;

#define ZFSDEV_MAX_MINOR        (1 << 16)
#define ZFS_MIN_MINOR   (ZFSDEV_MAX_MINOR + 1)

#define ZPOOL_EXPORT_AFTER_SPLIT 0x1

#ifdef _KERNEL
struct objset;
struct zfsvfs;

typedef struct zfs_creat {
        nvlist_t        *zct_zplprops;
        nvlist_t        *zct_props;
} zfs_creat_t;

extern dev_info_t *zfs_dip;

extern int zfs_secpolicy_snapshot_perms(const char *, cred_t *);
extern int zfs_secpolicy_rename_perms(const char *, const char *, cred_t *);
extern int zfs_secpolicy_destroy_perms(const char *, cred_t *);
extern int zfs_busy(void);
extern void zfs_unmount_snap(const char *);
extern void zfs_destroy_unmount_origin(const char *);
extern int getzfsvfs_impl(struct objset *, struct zfsvfs **);
extern int getzfsvfs(const char *, struct zfsvfs **);

/*
 * ZFS minor numbers can refer to either a control device instance or
 * a zvol. Depending on the value of zss_type, zss_data points to either
 * a zvol_state_t or a zfs_onexit_t.
 */
enum zfs_soft_state_type {
        ZSST_ZVOL,
        ZSST_CTLDEV
};

typedef struct zfs_soft_state {
        enum zfs_soft_state_type zss_type;
        void *zss_data;
} zfs_soft_state_t;

extern void *zfsdev_get_soft_state(minor_t minor,
    enum zfs_soft_state_type which);
extern minor_t zfsdev_minor_alloc(void);

extern void *zfsdev_state;
extern kmutex_t zfsdev_state_lock;

#endif  /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_ZFS_IOCTL_H */