Andreas Kling 3be1c7b514 Kernel: Fix awkward bug where "touch /foo/bar/baz" could create "/baz" ...

To accomodate file creation, path resolution optionally returns the
last valid parent directory seen while traversing the path.

Clients will then interpret "ENOENT, but I have a parent for you" as
meaning that the file doesn't exist, but its immediate parent directory
does. The client then goes ahead and creates a new file.

In the case of "/foo/bar/baz" where there is no "/foo", it would fail
with ENOENT and "/" as the last seen parent directory, causing e.g the
open() syscall to create "/baz".

Covered by test_io.

2020-01-03 03:57:10 +01:00

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