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exportfs: add explicit flag to request non-decodeable file handles

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So far, all callers of exportfs_encode_inode_fh(), except for fsnotify's
show_mark_fhandle(), check that filesystem can decode file handles, but
we would like to add more callers that do not require a file handle that
can be decoded.

Introduce a flag to explicitly request a file handle that may not to be
decoded later and a wrapper exportfs_encode_fid() that sets this flag
and convert show_mark_fhandle() to use the new wrapper.

This will be used to allow adding fanotify support to filesystems that
do not support NFS export.

Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20230502124817.3070545-3-amir73il@gmail.com>
This commit is contained in:
Amir Goldstein
2023-05-02 15:48:15 +03:00
committed by Jan Kara
parent b52878275c
commit 304e9c83e8
5 changed files with 34 additions and 8 deletions
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4
Documentation/filesystems/nfs/exporting.rst
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@@ -122,8 +122,8 @@ are exportable by setting the s_export_op field in the struct
super_block. This field must point to a "struct export_operations"
struct which has the following members:
encode_fh (optional)
Takes a dentry and creates a filehandle fragment which can later be used
encode_fh (optional)
Takes a dentry and creates a filehandle fragment which may later be used
to find or create a dentry for the same object. The default
implementation creates a filehandle fragment that encodes a 32bit inode
and generation number for the inode encoded, and if necessary the