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btrfs-progs: introduce helper for striped profiles

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There are several profiles like raid0, raid10, raid5 and raid6 that can
span as many devices as possible and need special handling for the
stripe calculations. Provide a helper to identify the profiles in a
simple way.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-10-07 01:22:33 +02:00
parent a25a5cc2c0
commit bc28dc6bea
2 changed files with 12 additions and 0 deletions
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11
kernel-shared/volumes.c
View File

@ -245,6 +245,17 @@ int btrfs_bg_type_to_sub_stripes(u64 flags)
return btrfs_raid_array[index].sub_stripes;
}
/*
* Number of stripes is not fixed and depends on the number of devices,
* utilizing as many as possible (RAID0/RAID10/RAID5/RAID6/...).
*/
bool btrfs_bg_type_is_stripey(u64 flags)
{
const int index = btrfs_bg_flags_to_raid_index(flags);
return btrfs_raid_array[index].devs_max == 0;
}
u64 btrfs_bg_flags_for_device_num(int number)
{
int i;

1
kernel-shared/volumes.h
View File

@ -313,5 +313,6 @@ int btrfs_bg_type_to_ncopies(u64 flags);
int btrfs_bg_type_to_nparity(u64 flags);
int btrfs_bg_type_to_sub_stripes(u64 flags);
u64 btrfs_bg_flags_for_device_num(int number);
bool btrfs_bg_type_is_stripey(u64 flags);
#endif