ovl: document lower modification caveats

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Some overlayfs optional features are incompatible with offline changes to
the lower tree and may result in -EXDEV, -EIO, or other errors.  Such
modification is not supported and the error behavior is intentionally not
specified.

Update the "Changes to underlying filesystems" section to note this
restriction.  Move the paragraph describing the offline behavior below the
online behavior so it is adjacent to the following 3 paragraphs describing
the NFS export offline modification behavior.

Link: https://lore.kernel.org/linux-unionfs/20200708142353.GA103536@redhat.com/
Link: https://lore.kernel.org/linux-unionfs/CAOQ4uxi23Zsmfb4rCed1n=On0NNA5KZD74jjjeyz+et32sk-gg@mail.gmail.com/
Link: https://lore.kernel.org/linux-unionfs/20200817135651.GA637139@redhat.com/
Link: https://lore.kernel.org/linux-unionfs/20200709153616.GE150543@redhat.com/
Link: https://lore.kernel.org/linux-unionfs/20200812135529.GA122370@kevinolos/
Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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Kevin Locke 2020-08-22 20:22:57 -06:00 • committed by Miklos Szeredi

parent 0a8d0b64dd

commit 13c6ad0f45

1 changed files with 7 additions and 3 deletions

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Documentation/filesystems/overlayfs.rst

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