From 562adaed911db581fe01664c07a27184e27087c3 Mon Sep 17 00:00:00 2001 From: Karel Zak Date: Tue, 3 Jul 2018 13:51:51 +0200 Subject: fallocate: add man page note about --collapse-range granularity Reported-by: Radka Skvarilova Signed-off-by: Karel Zak --- sys-utils/fallocate.1 | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'sys-utils/fallocate.1') diff --git a/sys-utils/fallocate.1 b/sys-utils/fallocate.1 index d4821dcd1..fe5072ae8 100644 --- a/sys-utils/fallocate.1 +++ b/sys-utils/fallocate.1 @@ -72,6 +72,12 @@ The option may not be specified for the collapse-range operation. .sp Available since Linux 3.15 for ext4 (only for extent-based files) and XFS. +.sp +A filesystem may place limitations on the granularity of the operation, in +order to ensure efficient implementation. Typically, offset and len must be a +multiple of the filesystem logical block size, which varies according to the +filesystem type and configuration. If a filesystem has such a requirement, +the operation will fail with the error EINVAL if this requirement is violated. .TP .BR \-d ", " \-\-dig\-holes Detect and dig holes. -- cgit v1.2.3-55-g7522