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>
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@ -336,8 +336,20 @@ the copied layers will fail the verification of the lower root file handle.
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Non-standard behavior
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---------------------
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Overlayfs can now act as a POSIX compliant filesystem with the following
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features turned on:
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Current version of overlayfs can act as a mostly POSIX compliant
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filesystem.
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This is the list of cases that overlayfs doesn't currently handle:
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a) POSIX mandates updating st_atime for reads. This is currently not
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done in the case when the file resides on a lower layer.
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b) If a file residing on a lower layer is opened for read-only and then
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memory mapped with MAP_SHARED, then subsequent changes to the file are not
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reflected in the memory mapping.
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The following options allow overlayfs to act more like a standards
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compliant filesystem:
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1) "redirect_dir"
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