RFR: 8266610: Method RandomAccessFile#length() returns 0 for block devices on linux. [v2]

[Vyom Tewari]

> RandomAccessFile.length() method for block device return always 0

Vyom Tewari has updated the pull request incrementally with one additional commit since the last revision:

  fixed assigning -1 to uint64_t

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3914/files
  - new: https://git.openjdk.java.net/jdk/pull/3914/files/8f348ef9..72beb715

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3914&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3914&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3914.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3914/head:pull/3914

PR: https://git.openjdk.java.net/jdk/pull/3914