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| -rw-r--r-- | utils/mount/nfs.man | 54 |
1 files changed, 38 insertions, 16 deletions
diff --git a/utils/mount/nfs.man b/utils/mount/nfs.man index 1b86768..be91a25 100644 --- a/utils/mount/nfs.man +++ b/utils/mount/nfs.man @@ -1523,32 +1523,54 @@ of Access Control Lists that are semantically richer than POSIX ACLs. NFS version 4 ACLs are not fully compatible with POSIX ACLs; as such, some translation between the two is required in an environment that mixes POSIX ACLs and NFS version 4. -.SH FILES -.TP 1.5i -.I /etc/fstab -file system table -.SH BUGS -The generic -.B remount -option is not fully supported. -Generic options, such as -.BR rw " and " ro -can be modified using the -.B remount -option, -but NFS-specific options are not all supported. +.SH "THE REMOUNT OPTION" +Generic mount options such as +.BR rw " and " sync +can be modified on NFS mount points using the +.BR remount +option. +See +.BR mount (8) +for more information on generic mount options. +.P +With few exceptions, NFS-specific options +are not able to be modified during a remount. The underlying transport or NFS version cannot be changed by a remount, for example. +.P Performing a remount on an NFS file system mounted with the .B noac option may have unintended consequences. The .B noac -option is a mixture of a generic option, +option is a combination of the generic option .BR sync , -and an NFS-specific option +and the NFS-specific option .BR actimeo=0 . +.SS "Unmounting after a remount" +For mount points that use NFS versions 2 or 3, the NFS umount subcommand +depends on knowing the original set of mount options used to perform the +MNT operation. +These options are stored on disk by the NFS mount subcommand, +and can be erased by a remount. .P +To ensure that the saved mount options are not erased during a remount, +specify either the local mount directory, or the server hostname and +export pathname, but not both, during a remount. For example, +.P +.NF +.TA 2.5i + mount -o remount,ro /mnt +.FI +.P +merges the mount option +.B ro +with the mount options already saved on disk for the NFS server mounted at /mnt. +.SH FILES +.TP 1.5i +.I /etc/fstab +file system table +.SH BUGS Before 2.4.7, the Linux NFS client did not support NFS over TCP. .P Before 2.4.20, the Linux NFS client used a heuristic |