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TaoMa/MkfsUpdate

MKFS UPDATE FOR SPARSE FILES

Owner: TaoMa

OVERVIEW

The disk layout for ocfs2 volume will be changed for sparse files in 1.4, so mkfs.ocfs2 have to be modified to fit this new feature. And since we may have many new features in the ocfs 1.4 and we may also need to keep the compatibility with the boxed runned in 1.2.x, it is necessary to make mkfs.ocfs2 more flexible with the new added feature. So this modification of mkfs.ocfs will not only benefit sparse files, but also many new features which will be added in ocfs2 in the future, such as unwritten extents etc.

INTERFACE OVERVIEW

mkfs.ocfs2 [--fs-feature-level=[default|max-compat|max-features]] [--fs-features=[[no]sparse,[no]unwritten,[no]backup-super,[no]local]]

fs-feature-level

fs-features

This option is used as an auxiliary option for "--fs-feature-level". So if a user want to set/disable a feature explicitly, he will use this option. Currently, there are only 4 different features and they are sparse files,unwritten extents, backup super block and local mount.

FEATURE LEVEL DETAIL

Three static feature sets will be recorded to indicate the 3 levels: default, max-compat and max-feature. Currently the flags for these 3 levels are:

Since we still don't ship 1.4.x, this flag is the same as default. Once we shipped out the 1.4, any new features's flag will not included in default, but in max-feature only.


2012-11-08 13:01