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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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fs/exportfs/expfs.c
+18 -2
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@@ -381,11 +381,27 @@ static int export_encode_fh(struct inode *inode, struct fid *fid,
return type;
}
/**
* exportfs_encode_inode_fh - encode a file handle from inode
* @inode: the object to encode
* @fid: where to store the file handle fragment
* @max_len: maximum length to store there
* @flags: properties of the requested file handle
*
* Returns an enum fid_type or a negative errno.
*/
int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
int *max_len, struct inode *parent)
int *max_len, struct inode *parent, int flags)
{
const struct export_operations *nop = inode->i_sb->s_export_op;
/*
* If a decodeable file handle was requested, we need to make sure that
* filesystem can decode file handles.
*/
if (nop && !(flags & EXPORT_FH_FID) && !nop->fh_to_dentry)
return -EOPNOTSUPP;
if (nop && nop->encode_fh)
return nop->encode_fh(inode, fid->raw, max_len, parent);
@@ -418,7 +434,7 @@ int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, int *max_len,
parent = p->d_inode;
}
error = exportfs_encode_inode_fh(inode, fid, max_len, parent);
error = exportfs_encode_inode_fh(inode, fid, max_len, parent, flags);
dput(p);
return error;