From 47e6f7423b9196ad6832d26cae52b7015f81ee7f Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 2 Mar 2018 22:56:53 +0100 Subject: btrfs: add support for 3-copy replication (raid1c3) Add new block group profile to store 3 copies in a simliar way that current RAID1 does. The profile attributes and constraints are defined in the raid table and used by the same code that already handles the 2-copy RAID1. The minimum number of devices is 3, the maximum number of devices/chunks that can be lost/damaged is 2. Like RAID6 but with 33% space utilization. Signed-off-by: David Sterba --- include/uapi/linux/btrfs.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/uapi/linux/btrfs.h') diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index 3ee0678c0a83..ba22f91a3f5b 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -831,7 +831,8 @@ enum btrfs_err_code { BTRFS_ERROR_DEV_TGT_REPLACE, BTRFS_ERROR_DEV_MISSING_NOT_FOUND, BTRFS_ERROR_DEV_ONLY_WRITABLE, - BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS + BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS, + BTRFS_ERROR_DEV_RAID1C3_MIN_NOT_MET, }; #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \ -- cgit v1.2.3 From 8d6fac0087e538173f34ca7431ed9b58581acf28 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 2 Mar 2018 22:56:53 +0100 Subject: btrfs: add support for 4-copy replication (raid1c4) Add new block group profile to store 4 copies in a simliar way that current RAID1 does. The profile attributes and constraints are defined in the raid table and used by the same code that already handles the 2- and 3-copy RAID1. The minimum number of devices is 4, the maximum number of devices/chunks that can be lost/damaged is 3. There is no comparable traditional RAID level, the profile is added for future needs to accompany triple-parity and beyond. Signed-off-by: David Sterba --- include/uapi/linux/btrfs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/linux/btrfs.h') diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index ba22f91a3f5b..a2b761275bba 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -833,6 +833,7 @@ enum btrfs_err_code { BTRFS_ERROR_DEV_ONLY_WRITABLE, BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS, BTRFS_ERROR_DEV_RAID1C3_MIN_NOT_MET, + BTRFS_ERROR_DEV_RAID1C4_MIN_NOT_MET, }; #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \ -- cgit v1.2.3 From cfbb825c76198c9095428c5f9362fbf6ae06f417 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Tue, 10 Jul 2018 18:15:05 +0200 Subject: btrfs: add incompat for raid1 with 3, 4 copies The new raid1c3 and raid1c4 profiles are backward incompatible and the name shall be 'raid1c34', the status can be found in the global supported features in /sys/fs/btrfs/features or in the per-filesystem directory. Signed-off-by: David Sterba --- include/uapi/linux/btrfs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/linux/btrfs.h') diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index a2b761275bba..7a8bc8b920f5 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -270,6 +270,7 @@ struct btrfs_ioctl_fs_info_args { #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8) #define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9) #define BTRFS_FEATURE_INCOMPAT_METADATA_UUID (1ULL << 10) +#define BTRFS_FEATURE_INCOMPAT_RAID1C34 (1ULL << 11) struct btrfs_ioctl_feature_flags { __u64 compat_flags; -- cgit v1.2.3