fs: use backing_file container for internal files with "fake" f_path

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Overlayfs uses open_with_fake_path() to allocate internal kernel files,
with a "fake" path - whose f_path is not on the same fs as f_inode.

Allocate a container struct backing_file for those internal files, that
is used to hold the "fake" ovl path along with the real path.

backing_file_real_path() can be used to access the stored real path.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Message-Id: <20230615112229.2143178-5-amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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Amir Goldstein 2023-06-15 14:22:28 +03:00 • committed by Christian Brauner

parent 8a05a8c31d

commit 62d53c4a1d

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5 changed files with 114 additions and 23 deletions

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50

fs/file_table.c

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5

fs/internal.h

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45

fs/open.c

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4

fs/overlayfs/file.c

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33

include/linux/fs.h

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