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Revert "Kernel & Userland: Allow to mount image files formatted with Ext2FS"

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This reverts commit a60ea79a41.

Reverting these changes since they broke things.
Fixes #1608.
This commit is contained in:
Andreas Kling 2020-04-03 21:20:46 +02:00
parent 28be90120b
commit 9ae3cced76
8 changed files with 51 additions and 101 deletions
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28
Base/usr/share/man/man2/mount.md
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@ -7,13 +7,12 @@ mount - mount a filesystem
```**c++
#include <unistd.h>
int mount(int source_fd, const char* target, const char* fs_type, int flags);
int mount(const char* source, const char* target, const char* fs_type, int flags);
```
## Description
`mount()` mounts a filesystem stored at `source_fd` by overlaying its contents
over `target`.
`mount()` mounts a filesystem stored at `source` by overlaying its contents over `target`.
`fs_type` must be one of the following supported filesystems:
@ -22,10 +21,9 @@ over `target`.
* `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`.
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` must be a path to a block device storing the filesystem contents. All
the other filesystems ignore the `source` argument (by convention, it should have the same
value as `fs_type`).
The following `flags` are supported:
@ -39,22 +37,14 @@ mounted file system.
### Bind mounts
If `MS_BIND` is specified in `flags`, `fs_type` is ignored and a bind mount is
performed instead. In this case, the file or directory specified by `source_fd`
is overlayed over `target` — the target appears to be replaced by a copy of the
source. This can be used as an alternative to symlinks or hardlinks.
If `MS_BIND` is specified in `flags`, `fs_type` is ignored and a bind mount is performed
instead. In this case `source` is treated as a path to a file or directory whose contents
are overlayed over `target`. This can be used as an alternative to symlinks or hardlinks.
## Errors
* `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 device is not found, or the device doesn't contain a valid filesystem image.
All of the usual path resolution errors may also occur.