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4 Commits

Author SHA1 Message Date
Amir Goldstein
f567377e40 fs: factor out backing_file_mmap() helper 
Assert that the file object is allocated in a backing_file container
so that file_user_path() could be used to display the user path and
not the backing file's path in /proc/<pid>/maps.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
 2023-12-23 16:35:09 +02:00
Amir Goldstein
9b7e9e2f5d fs: factor out backing_file_splice_{read,write}() helpers 
There is not much in those helpers, but it makes sense to have them
logically next to the backing_file_{read,write}_iter() helpers as they
may grow more common logic in the future.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
 2023-12-23 16:35:09 +02:00
Amir Goldstein
a6293b3e28 fs: factor out backing_file_{read,write}_iter() helpers 
Overlayfs submits files io to backing files on other filesystems.
Factor out some common helpers to perform io to backing files, into
fs/backing-file.c.

Suggested-by: Miklos Szeredi <miklos@szeredi.hu>
Link: https://lore.kernel.org/r/CAJfpeguhmZbjP3JLqtUy0AdWaHOkAPWeP827BBWwRFEAUgnUcQ@mail.gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
 2023-12-23 16:35:09 +02:00
Amir Goldstein
f91a704f71 fs: prepare for stackable filesystems backing file helpers 
In preparation for factoring out some backing file io helpers from
overlayfs, move backing_file_open() into a new file fs/backing-file.c
and header.

Add a MAINTAINERS entry for stackable filesystems and add a Kconfig
FS_STACK which stackable filesystems need to select.

For now, the backing_file struct, the backing_file alloc/free functions
and the backing_file_real_path() accessor remain internal to file_table.c.
We may change that in the future.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
 2023-12-23 16:35:08 +02:00