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Fix large dnode send stream flag conflict 

Bit 21 of the send stream flags was inadvertently used for two
different features under concurrent development.  To avoid any
future compatibility problems the large dnode flag is being
switched to bit 23 which is unused.

The large dnode feature has only been present in pre-releases of
ZoL and dnodesize defaults to legacy which is compatible with
existing OpenZFS implementations.  Users with dnodesize=auto
needing to use zfs send/recv must update ZoL on both the
source and destination systems.

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Ned Bass <bass6@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #6139
This commit is contained in:
Brian Behlendorf 2017-05-18 10:02:16 -07:00 committed by GitHub
parent 331ec1a1ad
commit a9f0d7dd89
1 changed files with 2 additions and 1 deletions
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3
include/sys/zfs_ioctl.h
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@ -100,8 +100,9 @@ typedef enum drr_headertype {
/* flag #18 is reserved for a Delphix feature */
#define DMU_BACKUP_FEATURE_LARGE_BLOCKS (1 << 19)
#define DMU_BACKUP_FEATURE_RESUMING (1 << 20)
#define DMU_BACKUP_FEATURE_LARGE_DNODE (1 << 21)
/* flag #21 is reserved for a Delphix feature */
#define DMU_BACKUP_FEATURE_COMPRESSED (1 << 22)
#define DMU_BACKUP_FEATURE_LARGE_DNODE (1 << 23)
/*
* Mask of all supported backup features