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ovl: doc: add non-standard corner cases 

While most corner cases have already been dealt with, some remain and
should be documented.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2019-05-31 11:27:25 +02:00
parent 146d62e5a5
commit 5d3211b651
1 changed files with 14 additions and 2 deletions
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16
Documentation/filesystems/overlayfs.txt
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@ -336,8 +336,20 @@ the copied layers will fail the verification of the lower root file handle.
Non-standard behavior
---------------------
Overlayfs can now act as a POSIX compliant filesystem with the following
features turned on:
Current version of overlayfs can act as a mostly POSIX compliant
filesystem.
This is the list of cases that overlayfs doesn't currently handle:
a) POSIX mandates updating st_atime for reads. This is currently not
done in the case when the file resides on a lower layer.
b) If a file residing on a lower layer is opened for read-only and then
memory mapped with MAP_SHARED, then subsequent changes to the file are not
reflected in the memory mapping.
The following options allow overlayfs to act more like a standards
compliant filesystem:
1) "redirect_dir"