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-rw-r--r--sys-utils/fallocate.16
1 files changed, 6 insertions, 0 deletions
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.