btrfs: zoned: only allow one process to add pages to a relocation inode
Don't allow more than one process to add pages to a relocation inode on a zoned filesystem, otherwise we cannot guarantee the sequential write rule once we're filling preallocated extents on a zoned filesystem. Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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