f2fs: add a sysfs entry to show zone capacity
This patch adds a sysfs entry showing the unusable space in a section
made by zone capacity.
Signed-off-by: 
Jaegeuk Kim <jaegeuk@kernel.org>
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This patch adds a sysfs entry showing the unusable space in a section
made by zone capacity.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>