tree 947b96edff05559043b83190cca8a4cc5ed859c6
parent 77ea2a4ba657a1ad4fb7c64bc5cdce84b8a132b6
author Jan Kara <jack@suse.cz> 1403800254 -0400
committer Theodore Ts'o <tytso@mit.edu> 1403800254 -0400

ext4: Fix hole punching for files with indirect blocks

Hole punching code for files with indirect blocks wrongly computed
number of blocks which need to be cleared when traversing the indirect
block tree. That could result in punching more blocks than actually
requested and thus effectively cause a data loss. For example:

fallocate -n -p 10240000 4096

will punch the range 10240000 - 12632064 instead of the range 1024000 -
10244096. Fix the calculation.

CC: stable@vger.kernel.org
Fixes: 8bad6fc813a3a5300f51369c39d315679fd88c72
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>