ovl: auto generate uuid for new overlay filesystems

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Add a new mount option uuid=auto, which is the default.

If a persistent UUID xattr is found it is used.

Otherwise, an existing ovelrayfs with copied up subdirs in upper dir
that was never mounted with uuid=on retains the null UUID.

A new overlayfs with no copied up subdirs, generates the persistent UUID
on first mount.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

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This commit is contained in:

Amir Goldstein 2023-07-07 11:26:29 +03:00

parent d9544c1b0d

commit cbb44f0935

4 changed files with 34 additions and 3 deletions

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8

Documentation/filesystems/overlayfs.rst

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4

fs/overlayfs/overlayfs.h

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3

fs/overlayfs/params.c

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22

fs/overlayfs/util.c

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