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Code Issues Releases Activity

8155 simplify dmu_write_policy handling of pre-compressed buffers

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illumos/illumos-gate@adaec86ad2
adaec86ad2

https://www.illumos.org/issues/8155
  When writing pre-compressed buffers, arc_write() requires that the compression
  algorithm used to compress the buffer matches the compression algorithm
  requested by the zio_prop_t, which is set by dmu_write_policy().
  This makes dmu_write_policy() and its callers a bit more complicated.
  We can simplify this by making arc_write() trust the caller to supply the type
  of pre-compressed buffer that it wants to write, and override the compression
  setting in the zio_prop_t.

Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Author: Matthew Ahrens <mahrens@delphix.com>
This commit is contained in:
Andriy Gapon 2017-06-09 14:57:45 +00:00
parent cc03e98a7b
commit 02ae6a9ae6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor-sys/illumos/dist/; revision=319738
5 changed files with 17 additions and 25 deletions
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11
uts/common/fs/zfs/arc.c
View File

@ -5607,6 +5607,7 @@ arc_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
arc_buf_hdr_t *hdr = buf->b_hdr;
arc_write_callback_t *callback;
zio_t *zio;
zio_prop_t localprop = *zp;
ASSERT3P(ready, !=, NULL);
ASSERT3P(done, !=, NULL);
@ -5617,7 +5618,13 @@ arc_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
if (l2arc)
arc_hdr_set_flags(hdr, ARC_FLAG_L2CACHE);
if (ARC_BUF_COMPRESSED(buf)) {
ASSERT3U(zp->zp_compress, !=, ZIO_COMPRESS_OFF);
/*
* We're writing a pre-compressed buffer. Make the
* compression algorithm requested by the zio_prop_t match
* the pre-compressed buffer's compression algorithm.
*/
localprop.zp_compress = HDR_GET_COMPRESS(hdr);
ASSERT3U(HDR_GET_LSIZE(hdr), !=, arc_buf_size(buf));
zio_flags |= ZIO_FLAG_RAW;
}
@ -5653,7 +5660,7 @@ arc_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, arc_buf_t *buf,
zio = zio_write(pio, spa, txg, bp,
abd_get_from_buf(buf->b_data, HDR_GET_LSIZE(hdr)),
HDR_GET_LSIZE(hdr), arc_buf_size(buf), zp, arc_write_ready,
HDR_GET_LSIZE(hdr), arc_buf_size(buf), &localprop, arc_write_ready,
(children_ready != NULL) ? arc_write_children_ready : NULL,
arc_write_physdone, arc_write_done, callback,
priority, zio_flags, zb);

4
uts/common/fs/zfs/dbuf.c
View File

@ -3535,9 +3535,7 @@ dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx)
wp_flag = WP_SPILL;
wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0;
dmu_write_policy(os, dn, db->db_level, wp_flag,
(data != NULL && arc_get_compression(data) != ZIO_COMPRESS_OFF) ?
arc_get_compression(data) : ZIO_COMPRESS_INHERIT, &zp);
dmu_write_policy(os, dn, db->db_level, wp_flag, &zp);
DB_DNODE_EXIT(db);
/*

21
uts/common/fs/zfs/dmu.c
View File

@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
* Copyright (c) 2011, 2017 by Delphix. All rights reserved.
*/
/* Copyright (c) 2013 by Saso Kiselkov. All rights reserved. */
/* Copyright (c) 2013, Joyent, Inc. All rights reserved. */
@ -1713,8 +1713,7 @@ dmu_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd)
DB_DNODE_ENTER(db);
dn = DB_DNODE(db);
dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC,
ZIO_COMPRESS_INHERIT, &zp);
dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC, &zp);
DB_DNODE_EXIT(db);
/*
@ -1884,8 +1883,7 @@ int zfs_mdcomp_disable = 0;
int zfs_redundant_metadata_most_ditto_level = 2;
void
dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp,
enum zio_compress override_compress, zio_prop_t *zp)
dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, zio_prop_t *zp)
{
dmu_object_type_t type = dn ? dn->dn_type : DMU_OT_OBJSET;
boolean_t ismd = (level > 0 || DMU_OT_IS_METADATA(type) ||
@ -1897,10 +1895,6 @@ dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp,
boolean_t nopwrite = B_FALSE;
boolean_t dedup_verify = os->os_dedup_verify;
int copies = os->os_copies;
boolean_t lz4_ac = spa_feature_is_active(os->os_spa,
SPA_FEATURE_LZ4_COMPRESS);
IMPLY(override_compress == ZIO_COMPRESS_LZ4, lz4_ac);
/*
* We maintain different write policies for each of the following
@ -1988,14 +1982,7 @@ dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp,
}
zp->zp_checksum = checksum;
/*
* If we're writing a pre-compressed buffer, the compression type we use
* must match the data. If it hasn't been compressed yet, then we should
* use the value dictated by the policies above.
*/
zp->zp_compress = override_compress != ZIO_COMPRESS_INHERIT
? override_compress : compress;
zp->zp_compress = compress;
ASSERT3U(zp->zp_compress, !=, ZIO_COMPRESS_INHERIT);
zp->zp_type = (wp & WP_SPILL) ? dn->dn_bonustype : type;

2
uts/common/fs/zfs/dmu_objset.c
View File

@ -1201,7 +1201,7 @@ dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
arc_release(os->os_phys_buf, &os->os_phys_buf);
dmu_write_policy(os, NULL, 0, 0, ZIO_COMPRESS_INHERIT, &zp);
dmu_write_policy(os, NULL, 0, 0, &zp);
zio = arc_write(pio, os->os_spa, tx->tx_txg,
blkptr_copy, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),

4
uts/common/fs/zfs/sys/dmu.h
View File

@ -21,7 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
* Copyright (c) 2011, 2017 by Delphix. All rights reserved.
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
* Copyright 2013 DEY Storage Systems, Inc.
@ -420,7 +420,7 @@ dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset,
#define WP_SPILL 0x4
void dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp,
enum zio_compress compress_override, struct zio_prop *zp);
struct zio_prop *zp);
/*
* The bonus data is accessed more or less like a regular buffer.
* You must dmu_bonus_hold() to get the buffer, which will give you a