c676692c61
The old implementation, at the VFS layer, would map the entire range of logical blocks between the starting offset and the first data block following that offset. With large sparse files this is very inefficient. The VFS currently doesn't provide an interface to improve upon the current implementation in a generic way. Add ufs_bmap_seekdata(), which uses the obvious algorithm of scanning indirect blocks to look for data blocks. Use it instead of vn_bmap_seekhole() to implement SEEK_DATA. Reviewed by: kib, mckusick MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D19598
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