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Add syscall quotactl_path, a variant of quotactl which allows to specify the mountpath instead of a path of to a block device. The quotactl syscall expects a path to the mounted block device to specify the filesystem to work on. This limits usage to filesystems which actually have a block device. quotactl_path replaces the path to the block device with a path where the filesystem is mounted at. The global Q_SYNC command to sync all filesystems is not supported for this new syscall, otherwise quotactl_path behaves like quotactl. Link: https://lore.kernel.org/r/20210304123541.30749-2-s.hauer@pengutronix.de Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>