K 10
svn:author
V 3
pfg
K 8
svn:date
V 27
2016-01-18T15:39:32.797969Z
K 7
svn:log
V 313
MFC	r293680
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

END