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authorAnton Ivanov <anton.ivanov@cambridgegreys.com>2020-04-22 19:00:01 +0300
committerRichard Weinberger <richard@nod.at>2020-06-02 23:37:55 +0300
commit54ebe4060fe6c4ab76c79354417612ac9cf4f95e (patch)
treeceb6f5e538059b73ee13c52afe22fb4b8276cfbe /arch/um
parent0b86ce29cfc273501d019b18f31cee7837c8fd2a (diff)
downloadlinux-54ebe4060fe6c4ab76c79354417612ac9cf4f95e.tar.xz
um: Use fdatasync() when mapping the UBD FSYNC command
We do not need to update the metadata (atime, mtime, etc) on the UBD file and/or the COW file until UML exits. UBD image mtime is checked in UML only when opening the files. After that they are locked and used exclusively by a single UML instance, so there is no point wasting resources on updating metadata on every sync. We can sync data only. The host will always update mtime if a file has been modified upon closing it. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/os-Linux/file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 044836ad7392..e4421dbc4c36 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -290,7 +290,7 @@ int os_write_file(int fd, const void *buf, int len)
int os_sync_file(int fd)
{
- int n = fsync(fd);
+ int n = fdatasync(fd);
if (n < 0)
return -errno;