From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Tue, 28 Aug 2018 23:38:00 +0000 (-0700)
Subject: libext2fs: use ZERO_RANGE before PUNCH_HOLE in unix_zeroout
X-Git-Tag: v1.45.0~44
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=3f6a9786d749e40952c233e6d1d324045d67416c;hp=3f6a9786d749e40952c233e6d1d324045d67416c;p=tools%2Fe2fsprogs.git

libext2fs: use ZERO_RANGE before PUNCH_HOLE in unix_zeroout

In unix_zeroout() for files, we should try a ZERO_RANGE before we try
PUNCH_HOLE because the former will not cause us to lose preallocated
blocks.  Since block devices have supported fallocate for a few years
now, refactor the fallocate calls into a helper and call it from either
case.

Reported-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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