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author | rmacklem <rmacklem@FreeBSD.org> | 2011-09-13 21:01:26 +0000 |
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committer | rmacklem <rmacklem@FreeBSD.org> | 2011-09-13 21:01:26 +0000 |
commit | 99f390a4e8015ddd72e91fd20840ca3847704ec6 (patch) | |
tree | 85cd8ef66ff4280d4897da2da74aae892c01d3fb /UPDATING | |
parent | d35d0d3c95dfa04aa8c0a53cc36c0491dd9f4f18 (diff) | |
download | FreeBSD-src-99f390a4e8015ddd72e91fd20840ca3847704ec6.zip FreeBSD-src-99f390a4e8015ddd72e91fd20840ca3847704ec6.tar.gz |
Modify vfs_register() to use a hash calculation
on vfc_name to set vfc_typenum, so that vfc_typenum doesn't
change when file systems are loaded in different orders. This
keeps NFS file handles from changing, for file systems that
use vfc_typenum in their fsid. This change is controlled via
a loader.conf variable called vfs.typenumhash, since vfc_typenum
will change once when this is enabled. It defaults to 1 for
9.0, but will default to 0 when MFC'd to stable/8.
Tested by: hrs
Reviewed by: jhb, pjd (earlier version)
Approved by: re (kib)
MFC after: 1 month
Diffstat (limited to 'UPDATING')
-rw-r--r-- | UPDATING | 12 |
1 files changed, 12 insertions, 0 deletions
@@ -22,6 +22,18 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 9.x IS SLOW: machines to maximize performance. (To disable malloc debugging, run ln -s aj /etc/malloc.conf.) +20110913: + This commit modifies vfs_register() so that it uses a hash + calculation to set vfc_typenum, which is enabled by default. + The first time a system is booted after this change, the + vfc_typenum values will change for all file systems. The + main effect of this is a change to the NFS server file handles + for file systems that use vfc_typenum in their fsid, such as ZFS. + It will, however, prevent vfc_typenum from changing when file + systems are loaded in a different order for subsequent reboots. + To disable this, you can set vfs.typenumhash=0 in /boot/loader.conf + until you are ready to remount all NFS clients after a reboot. + 20110828: Bump the shared library version numbers for libraries that do not use symbol versioning, have changed the ABI compared |