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Add types to featureflags in zfs

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The boolean featureflags in use thus far in ZFS are extremely useful,
but because they take advantage of the zap layer, more interesting data
than just a true/false value can be stored in a featureflag. In redacted
send/receive, this is used to store the list of redaction snapshots for
a redacted dataset.

This change adds the ability for ZFS to store types other than a boolean
in a featureflag. The only other implemented type is a uint64_t array.
It also modifies the interfaces around dataset features to accomodate
the new capabilities, and adds a few new functions to increase
encapsulation.

This functionality will be used by the Redacted Send/Receive feature.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #7981
This commit is contained in:
Paul Dagnelie
2018-10-16 11:15:04 -07:00
committed by Matthew Ahrens
parent 779a6c0bf6
commit d52d80b700
11 changed files with 276 additions and 104 deletions
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include/zfeature_common.h
+12 -2
View File
@@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2011, 2017 by Delphix. All rights reserved.
* Copyright (c) 2011, 2018 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
* Copyright (c) 2013, Joyent, Inc. All rights reserved.
* Copyright (c) 2017, Intel Corporation.
@@ -73,7 +73,10 @@ typedef enum spa_feature {
typedef enum zfeature_flags {
/* Can open pool readonly even if this feature is not supported. */
ZFEATURE_FLAG_READONLY_COMPAT = (1 << 0),
/* Is this feature necessary to read the MOS? */
/*
* Is this feature necessary to load the pool? i.e. do we need this
* feature to read the full feature list out of the MOS?
*/
ZFEATURE_FLAG_MOS = (1 << 1),
/* Activate this feature at the same time it is enabled. */
ZFEATURE_FLAG_ACTIVATE_ON_ENABLE = (1 << 2),
@@ -81,6 +84,12 @@ typedef enum zfeature_flags {
ZFEATURE_FLAG_PER_DATASET = (1 << 3)
} zfeature_flags_t;
typedef enum zfeature_type {
ZFEATURE_TYPE_BOOLEAN,
ZFEATURE_TYPE_UINT64_ARRAY,
ZFEATURE_NUM_TYPES
} zfeature_type_t;
typedef struct zfeature_info {
spa_feature_t fi_feature;
const char *fi_uname; /* User-facing feature name */
@@ -88,6 +97,7 @@ typedef struct zfeature_info {
const char *fi_desc; /* Feature description */
zfeature_flags_t fi_flags;
boolean_t fi_zfs_mod_supported; /* supported by running zfs module */
zfeature_type_t fi_type; /* Only relevant for PER_DATASET features */
/* array of dependencies, terminated by SPA_FEATURE_NONE */
const spa_feature_t *fi_depends;
} zfeature_info_t;