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[6.1] Track btrfs patches #26

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Closed

[6.1] Track btrfs patches #26

wants to merge 4 commits into from

Commits on Dec 18, 2022

  1. btrfs: add flags to give an hint to the chunk allocator 

    Add the following flags to give an hint about which chunk should be
allocated in which a disk.
The following flags are created:

- BTRFS_DEV_ALLOCATION_PREFERRED_DATA
  preferred data chunk, but metadata chunk allowed
- BTRFS_DEV_ALLOCATION_PREFERRED_METADATA
  preferred metadata chunk, but data chunk allowed
- BTRFS_DEV_ALLOCATION_METADATA_ONLY
  only metadata chunk allowed
- BTRFS_DEV_ALLOCATION_DATA_ONLY
  only data chunk allowed

Signed-off-by: Goffredo Baroncelli <[email protected]>
    @kreijack @kakra
    kreijack authored and kakra committed Dec 18, 2022
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  2. btrfs: export dev_item.type in /sys/fs/btrfs/<uuid>/devinfo/<devid>/type 

    Signed-off-by: Goffredo Baroncelli <[email protected]>
    @kreijack @kakra
    kreijack authored and kakra committed Dec 18, 2022
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  3. btrfs: change the DEV_ITEM 'type' field via sysfs 

    Signed-off-by: Kai Krakow <[email protected]>
    @kreijack @kakra
    kreijack authored and kakra committed Dec 18, 2022
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  4. btrfs: add allocator_hint mode 

    When this mode is enabled, the chunk allocation policy is modified as
follow.

Each disk may have a different tag:
- BTRFS_DEV_ALLOCATION_PREFERRED_METADATA
- BTRFS_DEV_ALLOCATION_METADATA_ONLY
- BTRFS_DEV_ALLOCATION_DATA_ONLY
- BTRFS_DEV_ALLOCATION_PREFERRED_DATA (default)

Where:
- ALLOCATION_PREFERRED_X means that it is preferred to use this disk for
the X chunk type (the other type may be allowed when the space is low)
- ALLOCATION_X_ONLY means that it is used *only* for the X chunk type.
This means also that it is a preferred choice.

Each time the allocator allocates a chunk of type X , first it takes the
disks tagged as ALLOCATION_X_ONLY or ALLOCATION_PREFERRED_X; if the space
is not enough, it uses also the disks tagged as ALLOCATION_METADATA_ONLY;
if the space is not enough, it uses also the other disks, with the
exception of the one marked as ALLOCATION_PREFERRED_Y, where Y the other
type of chunk (i.e. not X).

Signed-off-by: Goffredo Baroncelli <[email protected]>
    @kreijack @kakra
    kreijack authored and kakra committed Dec 18, 2022
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