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Change FIOC_MMAP into file operation call

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- Add mmap into file_operations and remove it from ioctl definitions.
- Add mm_map structure definitions to support future unmapping
- Modify all drivers to initialize the operations struct accordingly

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
This commit is contained in:
Jukka Laitinen
2023-01-02 17:02:51 +04:00
committed by Alan Carvalho de Assis
parent 41e9df2f3e
commit f33dc4df3f
111 changed files with 320 additions and 96 deletions
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Documentation/reference/user/10_filesystem.rst
+5 -6
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@@ -458,12 +458,11 @@ are two conditions where ``mmap()`` can be supported:
1. ``mmap()`` can be used to support *eXecute In Place* (XIP) on random
access media under the following very restrictive conditions:
a. The file-system supports the ``FIOC_MMAP`` ioctl command. Any file
system that maps files contiguously on the media should support
this ``ioctl`` command. By comparison, most file system scatter
files over the media in non-contiguous sectors. As of this
writing, ROMFS is the only file system that meets this
requirement.
a. Any file system that maps files contiguously on the media
should implement the mmap file operation. By comparison, most
file system scatter files over the media in non-contiguous
sectors. As of this writing, ROMFS is the only file system
that meets this requirement.
b. The underlying block driver supports the ``BIOC_XIPBASE``
``ioctl`` command that maps the underlying media to a randomly