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8b6497b4e7
Also adds partial . and .. support, and implements ENOTDIR error. The source of this problem was due to the off-by-one interface expected by readdir. Each directory entry contains a pointer to next, so it cannot be emitted to the user until the next entry is actually read. Returning the current position + 1 is insufficient, because the user will just retry cur + 1 as the start position to see if they've reached the end of the directory. Since directory entries are keyed by a 64-bit hash in bcachefs, the result was that the user would call readdir over and over with what it believed the next pointer to be until "cur + 1" reached some enormous 64-bit value related to the hash for the "lost+found" entry.
Userspace tools for bcachefs This builds the bcachefs tool, which has a number of subcommands for formatting and managing bcachefs filesystems: bcachefs format bcachefs unlock bcachefs assemble bcachefs incremental etc. Run bcachefs --help for full list of commands.