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Diffstat (limited to 'Documentation/filesystems/nfs/exporting.rst')
| -rw-r--r-- | Documentation/filesystems/nfs/exporting.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/filesystems/nfs/exporting.rst b/Documentation/filesystems/nfs/exporting.rst index 960be64446cb..0e98edd353b5 100644 --- a/Documentation/filesystems/nfs/exporting.rst +++ b/Documentation/filesystems/nfs/exporting.rst @@ -202,3 +202,16 @@ following flags are defined: This flag exempts the filesystem from subtree checking and causes exportfs to get back an error if it tries to enable subtree checking on it. + + EXPORT_OP_CLOSE_BEFORE_UNLINK - always close cached files before unlinking + On some exportable filesystems (such as NFS) unlinking a file that + is still open can cause a fair bit of extra work. For instance, + the NFS client will do a "sillyrename" to ensure that the file + sticks around while it's still open. When reexporting, that open + file is held by nfsd so we usually end up doing a sillyrename, and + then immediately deleting the sillyrenamed file just afterward when + the link count actually goes to zero. Sometimes this delete can race + with other operations (for instance an rmdir of the parent directory). + This flag causes nfsd to close any open files for this inode _before_ + calling into the vfs to do an unlink or a rename that would replace + an existing file. |