diff options
| author | Karel Zak | 2018-07-03 13:51:51 +0200 |
|---|---|---|
| committer | Karel Zak | 2018-07-03 13:51:51 +0200 |
| commit | 562adaed911db581fe01664c07a27184e27087c3 (patch) | |
| tree | 14db42c59024edf018e2656f6a2f49d757b7c98b | |
| parent | docs: update TODO (diff) | |
| download | kernel-qcow2-util-linux-562adaed911db581fe01664c07a27184e27087c3.tar.gz kernel-qcow2-util-linux-562adaed911db581fe01664c07a27184e27087c3.tar.xz kernel-qcow2-util-linux-562adaed911db581fe01664c07a27184e27087c3.zip | |
fallocate: add man page note about --collapse-range granularity
Reported-by: Radka Skvarilova <rskvaril@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
| -rw-r--r-- | sys-utils/fallocate.1 | 6 | ||||
| -rw-r--r-- | sys-utils/fallocate.c | 3 |
2 files changed, 9 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. diff --git a/sys-utils/fallocate.c b/sys-utils/fallocate.c index c6bed63ef..c97e63d4b 100644 --- a/sys-utils/fallocate.c +++ b/sys-utils/fallocate.c @@ -121,6 +121,9 @@ static loff_t cvtnum(char *s) static void xfallocate(int fd, int mode, off_t offset, off_t length) { int error; + +fprintf(stderr, "KZAK>>> %d\n", mode); + #ifdef HAVE_FALLOCATE error = fallocate(fd, mode, offset, length); #else |