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ovl: doc clarification

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Documentation says "The lower filesystem can be any filesystem supported by
Linux".  However, this is not the case, as Linux supports vfat and vfat
doesn't work as a lower filesystem

Reported-by: nerdopolis <bluescreen_avenger@verizon.net>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2020-11-12 11:31:55 +01:00
parent 5830fb6b54
commit 58afaf5d60
1 changed files with 7 additions and 5 deletions
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12
Documentation/filesystems/overlayfs.rst
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@ -97,11 +97,13 @@ directory trees to be in the same filesystem and there is no
requirement that the root of a filesystem be given for either upper or
lower.
The lower filesystem can be any filesystem supported by Linux and does
not need to be writable. The lower filesystem can even be another
overlayfs. The upper filesystem will normally be writable and if it
is it must support the creation of trusted.* extended attributes, and
must provide valid d_type in readdir responses, so NFS is not suitable.
A wide range of filesystems supported by Linux can be the lower filesystem,
but not all filesystems that are mountable by Linux have the features
needed for OverlayFS to work. The lower filesystem does not need to be
writable. The lower filesystem can even be another overlayfs. The upper
filesystem will normally be writable and if it is it must support the
creation of trusted.* extended attributes, and must provide valid d_type in
readdir responses, so NFS is not suitable.
A read-only overlay of two read-only filesystems may use any
filesystem type.