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Kernel: Add Plan9FS :^)

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This is an (incomplete, and not very stable) implementation of the client side
of the 9P protocol.
This commit is contained in:
Sergey Bugaev 2020-07-02 13:05:56 +03:00 • committed by Andreas Kling
parent 187b785a05
commit a8489967a3
5 changed files with 1147 additions and 6 deletions
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19
Base/usr/share/man/man2/mount.md
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@ -21,11 +21,13 @@ over `target`.
* `ProcFS` (or `proc`): The process pseudo-filesystem (normally mounted at `/proc`).
* `DevPtsFS` (or `devpts`): The pseudoterminal pseudo-filesystem (normally mounted at `/dev/pts`).
* `TmpFS` (or `tmp`): A non-persistent filesystem that stores all its data in RAM. An instance of this filesystem is normally mounted at `/tmp`.
* `Plan9FS` (or `9p`): A remote filesystem served over the 9P protocol.
For Ext2FS, `source_fd` must refer to an open file descriptor to a file containing
the filesystem image. This may be a device file or any other seekable file. All
the other filesystems ignore the `source_fd` - you can even pass an invalid file
descriptor such as -1.
For Ext2FS, `source_fd` must refer to an open file descriptor to a file
containing the filesystem image. This may be a device file or any other seekable
file. For Plan9FS, `source_fd` must refer to a socket or a device connected to a
9P server. All the other filesystems ignore the `source_fd` - you can even pass
an invalid file descriptor such as -1.
The following `flags` are supported:
@ -80,8 +82,13 @@ launch the initial userspace process.
* `EFAULT`: The `fs_type` or `target` are invalid strings.
* `EPERM`: The current process does not have superuser privileges.
* `ENODEV`: The `fs_type` is unrecognized, or the file descriptor to source is not found, or the source doesn't contain a valid filesystem image. Also, this error occurs if `fs_type` is valid, but the file descriptor from `source_fd` is not seekable.
* `EBADF`: If the `source_fd` is not valid, and either `fs_type` specifies a file-backed filesystem (and not a pseudo filesystem), or `MS_BIND` is specified in flags.
* `ENODEV`: The `fs_type` is unrecognized, or the file descriptor to source is
not found, or the source doesn't contain a valid filesystem image. Also, this
error occurs if `fs_type` is valid and required to be seekable, but the file
descriptor from `source_fd` is not seekable.
* `EBADF`: If the `source_fd` is not valid, and either `fs_type` specifies a
file-backed filesystem (and not a pseudo filesystem), or `MS_BIND` is
specified in flags.
All of the usual path resolution errors may also occur.