7.7. autofs

Updated autofs packages that fix multiple bugs and add various enhancements are now available for Red Hat Enterprise Linux 6.
The autofs utility controls the operation of the automount daemon. The automount daemon automatically mounts file systems when you use them, and unmounts them when they are not busy.

Bug Fixes

BZ#585059
When the automount daemon managed a large number of mount points, unmounting all active mount points could take a longer period of time than expected. If the daemon failed to exit within 45 seconds, the autofs init script timed out and returned a false-positive shutdown failure. To resolve this problem, the init script restart behavior has been modified. If the init script repeatedly fails to stop the daemon, the script terminates the daemon by sending the SIGKILL signal, which allows autofs to be restarted correctly.
BZ#819703
The automount interface matching code was able to detect only IPv4 interfaces. As a consequence, mount points were mounted with an incorrect mount type when using IPv6. To fix this problem, the automount interface matching code has been modified to use the getifaddrs() function insted of ioctl(). The automount interface matching code now properly recognizes IPv6 interfaces and both, IPv4 and IPv6 mounts are now mounted as expected.
BZ#827024, BZ#846852, BZ#847873
Previously, automount could terminate unexpectedly with a segmentation fault when using the internal hosts map. This could happen due to a function name collision between autofs and the libtirpc library. Both utilities called a debug logging function of the same name but with a different call signature. This update applies a series of patches that fix this problem by redefining the internal debug logging function in autofs. Also, several other bugs related to the autofs RPC function have been fixed. The automount daemon no longer crashes when using the internal hosts map and the libtirpc library is installed on the system.
BZ#834641
Due to an incorrectly placed port test in the get_nfs_info() function, autofs attempted to contact the portmap service when mounting NFSv4 file systems. Consequently, if the portmap service was disabled on the server, automount failed to mount the NFSv4 file systems with the following error message:
mount(nfs): no hosts available
With this update, the port check has been moved to the correct location in the code so that automount no longer contacts the server's port mapper when mounting NFSv4 file systems. NFSv4 file systems are mounted as expected in this scenario.
BZ#836422
Previously, the autofs internal hosts map could not be refreshed until all entries in the map had been unmounted. Consequently, users could not access newly exported NFS shares and any attempt to access such shares failed with the "No such file or directory" error message. This update allows the server export list to be updated by sending a HUP signal to the automount daemon. This causes automount to request server exports so the hosts map and associated automounts can be updated. Newly exported NFS shares can now be accessed as expected.
BZ#845512
Previously, the usage message displayed by the autofs init script did not contain the "usage" command entry. This update corrects the init script so it now displays all commands that can be used with the autofs service as expected.
BZ#856296
When stopping the autofs service, autofs did not correctly handle situations where a null map entry appeared after a corresponding indirect map entry in the autofs master map. As a consequence, automount attempted to unmount a unmount a non-existing automount point and became unresponsive. This update modifies autofs to process null map entries correctly so it no longer attempts to unmount non-existing automount points. The autofs service now stops gracefully as expected.
BZ#860184
Previously, the autofs init script did not allow any commands to be run by unprivileged users. However, it is desirable to let a non-root user check the status of autofs for example for monitoring purposes. Therefore, this update modifies the autofs init script to allow unprivileged users to execute the service autofs status command.
BZ#865311
Previous versions of autofs contained several typographical errors and misleading information in the auto.master(5) man page, and autofs.sysconfig and autofs.conf configuration files. This update corrects these bugs including the description of the MOUNT_NFS_DEFAULT_PROTOCOL and MOUNT_WAIT options.
BZ#868973
When attempting to mount an NFSv4 share from an unreachable NFSv4 server, autofs did not close IPv6 UDP sockets. This could eventually lead to depletion of free file descriptors and an automount failure. This update modifies autofs to close IPv6 UDP sockets as expected, and automount no longer fails due to too many open files in the described scenario.
BZ#892846
When using autofs with LDAP, the code used to perform a base DN search allowed a race between two threads executing the same function simultaneously to occur. As a result of this race, autofs could attempt to access already freed memory and terminate unexpectedly with a segmentation fault. With this update, the code used to perform base DN searches has been moved to the function protected by a mutex, which prevents the race from occurring. The base DN searches are now performed only when refreshing settings of the map lookup modules.

Enhancements

BZ#846870
This update modifies autofs to allow configuring of separate timeout values for individual direct map entries in the autofs master map.
BZ#859947
With this update, the auto.master(5) man page has been updated to document the "-t, --timeout" option in the FORMAT options section.
BZ#866338
The auto.master(5) man page has been updated to clarify description of the "nobind" option when it is used with direct mount maps.
BZ#866396
The autofs.spec file has been modified to update build dependency of the autofs sss interface library. The library now requires the libsss_autofs package instead of sssd.
BZ#822733
This update improves debug logging of autofs. With debug logging set on, automount now reports whether it needs to read a mount map or not.
All users of autofs are advised to upgrade to these updated packages, which fix these bugs and add these enhancements.
Updated autofs packages that fix one bug are now available for Red Hat Enterprise Linux 6.
The autofs utility controls the operation of the automount daemon. The automount daemon automatically mounts file systems when in use and unmounts them when they are not busy.

Bug Fix

BZ#921147
Previously, when two nearly simultaneous mount requests occurred, NFS mounts mounted by autofs sometimes failed. This caused a fatal error for the host being probed and autofs failed the mount attempt with a "mount(nfs): no hosts available" error message. This update provides a patch which uses numeric protocol IDs, instead of protoent structures, and NFS mount attempts by autofs no longer fail in the described scenario.
Users of autofs are advised to upgrade to these updated packages, which fix this bug.
Updated autofs packages that fix one bug are now available for Red Hat Enterprise Linux 6.
The autofs utility controls the operation of the automount daemon. The automount daemon automatically mounts file systems when in use and unmounts them when they are not busy.

Bug Fix

BZ#1006163
Previously, when mounting new mounts, the automount daemon stopped responding. This occurred due to an execution order race during an expire thread creation. This update refactors the code handling the expire thread creation and the problem no longer occurs.
Users of autofs are advised to upgrade to these updated packages, which fix this bug.