271 lines
8.3 KiB
C
271 lines
8.3 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 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
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*/
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#ifndef _ZIO_IMPL_H
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#define _ZIO_IMPL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* XXX -- Describe ZFS I/O pipeline here. Fill in as needed.
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*
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* The ZFS I/O pipeline is comprised of various stages which are defined
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* in the zio_stage enum below. The individual stages are used to construct
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* these basic I/O operations: Read, Write, Free, Claim, and Ioctl.
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*
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* I/O operations: (XXX - provide detail for each of the operations)
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*
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* Read:
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* Write:
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* Free:
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* Claim:
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* Ioctl:
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*
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* Although the most common pipeline are used by the basic I/O operations
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* above, there are some helper pipelines (one could consider them
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* sub-pipelines) which are used internally by the ZIO module and are
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* explained below:
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*
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* Interlock Pipeline:
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* The interlock pipeline is the most basic pipeline and is used by all
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* of the I/O operations. The interlock pipeline does not perform any I/O
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* and is used to coordinate the dependencies between I/Os that are being
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* issued (i.e. the parent/child relationship).
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*
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* Vdev child Pipeline:
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* The vdev child pipeline is responsible for performing the physical I/O.
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* It is in this pipeline where the I/O are queued and possibly cached.
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*
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* In addition to performing I/O, the pipeline is also responsible for
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* data transformations. The transformations performed are based on the
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* specific properties that user may have selected and modify the
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* behavior of the pipeline. Examples of supported transformations are
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* compression, dedup, and nop writes. Transformations will either modify
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* the data or the pipeline. This list below further describes each of
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* the supported transformations:
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*
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* Compression:
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* ZFS supports three different flavors of compression -- gzip, lzjb, and
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* zle. Compression occurs as part of the write pipeline and is performed
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* in the ZIO_STAGE_WRITE_BP_INIT stage.
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*
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* Dedup:
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* Dedup reads are handled by the ZIO_STAGE_DDT_READ_START and
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* ZIO_STAGE_DDT_READ_DONE stages. These stages are added to an existing
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* read pipeline if the dedup bit is set on the block pointer.
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* Writing a dedup block is performed by the ZIO_STAGE_DDT_WRITE stage
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* and added to a write pipeline if a user has enabled dedup on that
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* particular dataset.
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*
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* NOP Write:
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* The NOP write feature is performed by the ZIO_STAGE_NOP_WRITE stage
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* and is added to an existing write pipeline if a crypographically
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* secure checksum (i.e. SHA256) is enabled and compression is turned on.
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* The NOP write stage will compare the checksums of the current data
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* on-disk (level-0 blocks only) and the data that is currently being written.
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* If the checksum values are identical then the pipeline is converted to
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* an interlock pipeline skipping block allocation and bypassing the
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* physical I/O. The nop write feature can handle writes in either
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* syncing or open context (i.e. zil writes) and as a result is mutually
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* exclusive with dedup.
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*
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* Encryption:
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* Encryption and authentication is handled by the ZIO_STAGE_ENCRYPT stage.
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* This stage determines how the encryption metadata is stored in the bp.
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* Decryption and MAC verification is performed during zio_decrypt() as a
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* transform callback. Encryption is mutually exclusive with nopwrite, because
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* blocks with the same plaintext will be encrypted with different salts and
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* IV's (if dedup is off), and therefore have different ciphertexts. For dedup
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* blocks we deterministically generate the IV and salt by performing an HMAC
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* of the plaintext, which is computationally expensive, but allows us to keep
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* support for encrypted dedup. See the block comment in zio_crypt.c for
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* details.
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*/
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/*
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* zio pipeline stage definitions
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*/
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enum zio_stage {
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ZIO_STAGE_OPEN = 1 << 0, /* RWFCI */
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ZIO_STAGE_READ_BP_INIT = 1 << 1, /* R---- */
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ZIO_STAGE_WRITE_BP_INIT = 1 << 2, /* -W--- */
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ZIO_STAGE_FREE_BP_INIT = 1 << 3, /* --F-- */
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ZIO_STAGE_ISSUE_ASYNC = 1 << 4, /* RWF-- */
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ZIO_STAGE_WRITE_COMPRESS = 1 << 5, /* -W--- */
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ZIO_STAGE_ENCRYPT = 1 << 6, /* -W--- */
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ZIO_STAGE_CHECKSUM_GENERATE = 1 << 7, /* -W--- */
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ZIO_STAGE_NOP_WRITE = 1 << 8, /* -W--- */
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ZIO_STAGE_DDT_READ_START = 1 << 9, /* R---- */
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ZIO_STAGE_DDT_READ_DONE = 1 << 10, /* R---- */
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ZIO_STAGE_DDT_WRITE = 1 << 11, /* -W--- */
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ZIO_STAGE_DDT_FREE = 1 << 12, /* --F-- */
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ZIO_STAGE_GANG_ASSEMBLE = 1 << 13, /* RWFC- */
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ZIO_STAGE_GANG_ISSUE = 1 << 14, /* RWFC- */
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ZIO_STAGE_DVA_THROTTLE = 1 << 15, /* -W--- */
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ZIO_STAGE_DVA_ALLOCATE = 1 << 16, /* -W--- */
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ZIO_STAGE_DVA_FREE = 1 << 17, /* --F-- */
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ZIO_STAGE_DVA_CLAIM = 1 << 18, /* ---C- */
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ZIO_STAGE_READY = 1 << 19, /* RWFCI */
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ZIO_STAGE_VDEV_IO_START = 1 << 20, /* RW--I */
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ZIO_STAGE_VDEV_IO_DONE = 1 << 21, /* RW--I */
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ZIO_STAGE_VDEV_IO_ASSESS = 1 << 22, /* RW--I */
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ZIO_STAGE_CHECKSUM_VERIFY = 1 << 23, /* R---- */
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ZIO_STAGE_DONE = 1 << 24 /* RWFCI */
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};
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#define ZIO_INTERLOCK_STAGES \
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(ZIO_STAGE_READY | \
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ZIO_STAGE_DONE)
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#define ZIO_INTERLOCK_PIPELINE \
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ZIO_INTERLOCK_STAGES
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#define ZIO_VDEV_IO_STAGES \
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(ZIO_STAGE_VDEV_IO_START | \
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ZIO_STAGE_VDEV_IO_DONE | \
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ZIO_STAGE_VDEV_IO_ASSESS)
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#define ZIO_VDEV_CHILD_PIPELINE \
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(ZIO_VDEV_IO_STAGES | \
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ZIO_STAGE_DONE)
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#define ZIO_READ_COMMON_STAGES \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_VDEV_IO_STAGES | \
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ZIO_STAGE_CHECKSUM_VERIFY)
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#define ZIO_READ_PHYS_PIPELINE \
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ZIO_READ_COMMON_STAGES
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#define ZIO_READ_PIPELINE \
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(ZIO_READ_COMMON_STAGES | \
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ZIO_STAGE_READ_BP_INIT)
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#define ZIO_DDT_CHILD_READ_PIPELINE \
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ZIO_READ_COMMON_STAGES
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#define ZIO_DDT_READ_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_STAGE_READ_BP_INIT | \
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ZIO_STAGE_DDT_READ_START | \
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ZIO_STAGE_DDT_READ_DONE)
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#define ZIO_WRITE_COMMON_STAGES \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_VDEV_IO_STAGES | \
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ZIO_STAGE_ISSUE_ASYNC | \
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ZIO_STAGE_CHECKSUM_GENERATE)
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#define ZIO_WRITE_PHYS_PIPELINE \
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ZIO_WRITE_COMMON_STAGES
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#define ZIO_REWRITE_PIPELINE \
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(ZIO_WRITE_COMMON_STAGES | \
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ZIO_STAGE_WRITE_COMPRESS | \
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ZIO_STAGE_ENCRYPT | \
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ZIO_STAGE_WRITE_BP_INIT)
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#define ZIO_WRITE_PIPELINE \
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(ZIO_WRITE_COMMON_STAGES | \
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ZIO_STAGE_WRITE_BP_INIT | \
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ZIO_STAGE_WRITE_COMPRESS | \
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ZIO_STAGE_ENCRYPT | \
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ZIO_STAGE_DVA_THROTTLE | \
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ZIO_STAGE_DVA_ALLOCATE)
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#define ZIO_DDT_CHILD_WRITE_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_VDEV_IO_STAGES | \
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ZIO_STAGE_DVA_THROTTLE | \
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ZIO_STAGE_DVA_ALLOCATE)
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#define ZIO_DDT_WRITE_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_STAGE_WRITE_BP_INIT | \
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ZIO_STAGE_ISSUE_ASYNC | \
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ZIO_STAGE_WRITE_COMPRESS | \
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ZIO_STAGE_ENCRYPT | \
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ZIO_STAGE_CHECKSUM_GENERATE | \
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ZIO_STAGE_DDT_WRITE)
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#define ZIO_GANG_STAGES \
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(ZIO_STAGE_GANG_ASSEMBLE | \
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ZIO_STAGE_GANG_ISSUE)
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#define ZIO_FREE_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_STAGE_FREE_BP_INIT | \
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ZIO_STAGE_DVA_FREE)
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#define ZIO_DDT_FREE_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_STAGE_FREE_BP_INIT | \
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ZIO_STAGE_ISSUE_ASYNC | \
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ZIO_STAGE_DDT_FREE)
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#define ZIO_CLAIM_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_STAGE_DVA_CLAIM)
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#define ZIO_IOCTL_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_STAGE_VDEV_IO_START | \
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ZIO_STAGE_VDEV_IO_ASSESS)
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#define ZIO_TRIM_PIPELINE \
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(ZIO_INTERLOCK_STAGES | \
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ZIO_STAGE_ISSUE_ASYNC | \
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ZIO_VDEV_IO_STAGES)
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#define ZIO_BLOCKING_STAGES \
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(ZIO_STAGE_DVA_ALLOCATE | \
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ZIO_STAGE_DVA_CLAIM | \
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ZIO_STAGE_VDEV_IO_START)
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extern void zio_inject_init(void);
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extern void zio_inject_fini(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ZIO_IMPL_H */
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