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virfile: add comment about the use of SEEK_END in virFileDiskCopy

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Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Claudio Fontana 2022-05-06 15:10:50 +02:00 committed by Daniel P. Berrangé
parent 8c09638514
commit f79de95b16
1 changed files with 4 additions and 0 deletions
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4
src/util/virfile.c
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@ -4741,6 +4741,10 @@ virFileDiskCopy(int disk_fd, const char *disk_path, int remote_fd, const char *r
if (!p.isBlockDev && p.isDirect) {
off_t off;
if (p.isWrite) {
/*
* note: for write we do not only check that disk_fd is seekable,
* we also want to know that the file is empty, so we need SEEK_END.
*/
if ((off = lseek(disk_fd, 0, SEEK_END)) != 0) {
virReportSystemError(off < 0 ? errno : EINVAL, "%s",
_("O_DIRECT write needs empty seekable file"));