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>
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@ -367,8 +367,11 @@ Metadata only copy up
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When the "metacopy" feature is enabled, overlayfs will only copy
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When the "metacopy" feature is enabled, overlayfs will only copy
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up metadata (as opposed to whole file), when a metadata specific operation
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up metadata (as opposed to whole file), when a metadata specific operation
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like chown/chmod is performed. Full file will be copied up later when
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like chown/chmod is performed. An upper file in this state is marked with
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file is opened for WRITE operation.
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"trusted.overlayfs.metacopy" xattr which indicates that the upper file
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contains no data. The data will be copied up later when file is opened for
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WRITE operation. After the lower file's data is copied up,
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the "trusted.overlayfs.metacopy" xattr is removed from the upper file.
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In other words, this is delayed data copy up operation and data is copied
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In other words, this is delayed data copy up operation and data is copied
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up when there is a need to actually modify data.
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up when there is a need to actually modify data.
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