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style(9) cleanups.
Just to reduce some of the issues found with indent(1).
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ext4: add support for reading sparse files
Our older GCC can't handle anonymous unions, so
ia64 and powerpc LINT kernels are now failing.
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ext4: add support for reading sparse files
Add support for sparse files in ext4. Also implement read-ahead, which
greatly increases the performance when transferring files from ext4.
The sparse file support has become very common in ext4.
Both features implemented by Damjan Jovanovic.
PR: 205816
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ext2: Garbage-collect some unused variables
Reported by: clang static analysis
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Basic support for extents was implemented by Zheng Liu as part
of his Google Summer of Code in 2010. This support is read-only
at this time.
In addition to extents we also support the huge_file extension
for read-only purposes. This works nicely with the additional
support for birthtime/nanosec timestamps and dir_index that
have been added lately.
The implementation may not work for all ext4 filesystems as
it doesn't support some features that are being enabled by
default on recent linux like flex_bg. Nevertheless, the feature
should be very useful for migration or simple access in
filesystems that have been converted from ext2/3 or don't use
incompatible features.
Special thanks to Zheng Liu for his dedication and continued
work to support ext2 in FreeBSD.
Submitted by: Zheng Liu (lz@)
Reviewed by: Mike Ma, Christoph Mallon (previous version)
Sponsored by: Google Inc.
MFC after: 3 weeks
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