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author | Ingo Molnar <mingo@kernel.org> | 2021-02-12 15:36:43 +0300 |
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committer | Ingo Molnar <mingo@kernel.org> | 2021-02-12 15:36:43 +0300 |
commit | a3251c1a36f595046bea03935ebe37a1e1f1f1d7 (patch) | |
tree | 14b51f8bf1d7e1bb35697cb4704255b51b15baa9 /Documentation/filesystems/overlayfs.rst | |
parent | 72f40a2823d6e16229ab58b898c6f22044e5222f (diff) | |
parent | ab234a260b1f625b26cbefa93ca365b0ae66df33 (diff) | |
download | linux-a3251c1a36f595046bea03935ebe37a1e1f1f1d7.tar.xz |
Merge branch 'x86/paravirt' into x86/entry
Merge in the recent paravirt changes to resolve conflicts caused
by objtool annotations.
Conflicts:
arch/x86/xen/xen-asm.S
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/filesystems/overlayfs.rst')
-rw-r--r-- | Documentation/filesystems/overlayfs.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst index 587a93973929..78240e29b0bb 100644 --- a/Documentation/filesystems/overlayfs.rst +++ b/Documentation/filesystems/overlayfs.rst @@ -586,6 +586,14 @@ without significant effort. The advantage of mounting with the "volatile" option is that all forms of sync calls to the upper filesystem are omitted. +In order to avoid a giving a false sense of safety, the syncfs (and fsync) +semantics of volatile mounts are slightly different than that of the rest of +VFS. If any writeback error occurs on the upperdir's filesystem after a +volatile mount takes place, all sync functions will return an error. Once this +condition is reached, the filesystem will not recover, and every subsequent sync +call will return an error, even if the upperdir has not experience a new error +since the last sync call. + When overlay is mounted with "volatile" option, the directory "$workdir/work/incompat/volatile" is created. During next mount, overlay checks for this directory and refuses to mount if present. This is a strong |