IIUC: 1) btrfs fi df already shows the alloc-ed space and the space used out of that.
2) Despite snapshots, CoW and compression, the tree knows how many extents of data and metadata there are, and how many bytes on disk these occcupy, no matter what is the total (uncompressed, "unsnapshotted") size of all the directories and files on the disk. So this means that btrfs fi df actually shows the real on-disk usage. In this case, why do we hear people saying it's not possible to know the actual on-disk usage and when a btrfs-formatted disk (or partition) will go out of space? -- Shriramana Sharma ஶ்ரீரமணஶர்மா श्रीरमणशर्मा -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
