There are some incompatibilities with the following functions compared to 4.3A30:
Number | Item |
|---|---|
1 | Support of sendfile(2) |
2 | Change in operation at the time of specifying the mount option atime |
3 | Cannot create sockets |
4 | Cannot create named pipes |
5 | [RHEL8] Loop back mount disabled |
Note
When the OS before upgrading is RHEL5, incompatibilities of the number 1 to 3 occur.
When the OS after upgrading is RHEL8, an incompatibility of the number 5 occurs.
Incompatibility description
Action of sendfile(2) to the GFS Shared File System has been changed.
Before change: Abnormal exit (return code: -1, errno: EINVAL)
After change: Normal exit
Corrective action
None.
Incompatibility description
Operation at the time of specifying the mount option atime has been changed.
Before change:
The last access time of a file is updated for each file access.
After change:
The last access time of a file is updated when the previous last access time is the same as or older than the last modify time or the last change time. Also, when the previous last access time of a file is old for over a day, it is updated.
Corrective action
To execute the operation performed before change, change the mount option which is described in /etc/fstab from atime to strictatime.
Incompatibility description
Operation when creating sockets on the GFS Shared File System by specifying S_IFSOCK in the second argument of mknod(2) has been changed.
Before change: Normal exit
After change: Abnormal exit (return code: -1, errno: EPERM)
Corrective action
None.
Incompatibility description
Operation when creating named pipes on the GFS Shared File System by specifying S_IFIFO in the second argument of mknod(2) has been changed.
Before change: Normal exit
After change: Abnormal exit (return code: -1, errno: EPERM)
Corrective action
None.
Incompatibility description
Operation when mounting an image file (such as iso) located on the GFS Shared File System as a loop device by mount(8) with the -o loop option has been changed.
Before change: Mount terminates normally.
After change: Mount terminates abnormally with the following message:
mount: mountpoint wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error. |
Corrective action
Copy the image file to a file system other than the GFS Shared File System, and then mount the file.
