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| /openbmc/linux/fs/btrfs/ |
| H A D | sysfs.c | 19fc516a Tue Feb 08 13:31:21 CST 2022 Stefan Roesch <shr@fb.com> btrfs: sysfs: export chunk size in space infos
Add new sysfs knob
/sys/fs/btrfs/<uuid>/allocation/<type>/chunk_size.
This allows to query the chunk size and also set the chunk size.
Constraints:
- can be changed by root only
- system chunk size can't be set
- maximum chunk size is 10% of the filesystem size
- final value is rounded down to a multiple of 256M
- cannot be set on zoned filesystem
Note, that rounding and the 10% clamp will result to a different value
on filesystems smaller than 10G, typically 768M.
Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ Changes to original submission:
- document setting constraints
- drop read-only requirement
- drop unnecessary error messages
- fix return values of _store callback
- use memparse for the value
- fix rounding down to 256M
]
Signed-off-by: David Sterba <dsterba@suse.com>
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