btrfs: retrieve more info from FS_INFO ioctl

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Provide the basic information about filesystem through the ioctl:
* b-tree node size (same as leaf size)
* sector size
* expected alignment of CLONE_RANGE and EXTENT_SAME ioctl arguments

Backward compatibility: if the values are 0, kernel does not provide
this information, the applications should ignore them.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

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David Sterba 2014-05-07 18:17:06 +02:00 • committed by Chris Mason

parent 7d824b6f9c

commit 80a773fbfc

2 changed files with 9 additions and 1 deletions

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4

fs/btrfs/ioctl.c

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6

include/uapi/linux/btrfs.h

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