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| author |   Jonathan Corbet <corbet@lwn.net> | 2019-06-14 14:18:53 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2019-06-14 14:18:53 -0600 |
| commit | 8afecfb0ec961e37e61b2d19c4fa71617a9482de (patch) | |
| tree | c43ea51a47b1e76b762caa4c1b0c356249e5e874 /Documentation/filesystems | |
| parent | Documentation: Remove duplicate x86 index entry (diff) | |
| parent | Linux 5.2-rc4 (diff) | |
| download | linux-dev-8afecfb0ec961e37e61b2d19c4fa71617a9482de.tar.xz linux-dev-8afecfb0ec961e37e61b2d19c4fa71617a9482de.zip | |
Merge tag 'v5.2-rc4' into mauro
We need to pick up post-rc1 changes to various document files so they don't
get lost in Mauro's massive RST conversion push.
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/overlayfs.txt | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt index eef7d9d259e8..1da2f1668f08 100644 --- a/Documentation/filesystems/overlayfs.txt +++ b/Documentation/filesystems/overlayfs.txt @@ -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" |