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| author | Yuriy Belikov <yuriybelikov1@gmail.com> | 2024-09-04 19:54:29 +0300 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2024-09-08 16:36:38 +0300 |
| commit | 930b7c32ea2b514fb2c37aa3d4b946d954ee7fa2 (patch) | |
| tree | ab223f2d619a53a4c29fab8f9166453e8bce145d | |
| parent | 7d6899fb69d25e1bc6f4700b7c1d92e6b608593d (diff) | |
| download | linux-930b7c32ea2b514fb2c37aa3d4b946d954ee7fa2.tar.xz | |
overlayfs.rst: update metacopy section in overlayfs documentation
- Provide info about trusted.overlay.metacopy extended attribute
- Minor rephrasing regarding copy-up operation with metacopy=on
Signed-off-by: Yuriy Belikov <yuriybelikov1@gmail.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
| -rw-r--r-- | Documentation/filesystems/overlayfs.rst | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst index 165514401441..343644712340 100644 --- a/Documentation/filesystems/overlayfs.rst +++ b/Documentation/filesystems/overlayfs.rst @@ -367,8 +367,11 @@ Metadata only copy up When the "metacopy" feature is enabled, overlayfs will only copy up metadata (as opposed to whole file), when a metadata specific operation -like chown/chmod is performed. Full file will be copied up later when -file is opened for WRITE operation. +like chown/chmod is performed. An upper file in this state is marked with +"trusted.overlayfs.metacopy" xattr which indicates that the upper file +contains no data. The data will be copied up later when file is opened for +WRITE operation. After the lower file's data is copied up, +the "trusted.overlayfs.metacopy" xattr is removed from the upper file. In other words, this is delayed data copy up operation and data is copied up when there is a need to actually modify data. |