Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-22 20:22:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

um: Use fdatasync() when mapping the UBD FSYNC command

Browse Source 
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>
This commit is contained in:
Anton Ivanov 2020-04-22 17:00:01 +01:00 committed by Richard Weinberger
parent 0b86ce29cf
commit 54ebe4060f
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/um/os-Linux/file.c
View File

@ -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;