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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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12
include/linux/exportfs.h
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@@ -136,6 +136,7 @@ struct fid {
};
#define EXPORT_FH_CONNECTABLE 0x1 /* Encode file handle with parent */
#define EXPORT_FH_FID 0x2 /* File handle may be non-decodeable */
/**
* struct export_operations - for nfsd to communicate with file systems
@@ -227,9 +228,18 @@ struct export_operations {
};
extern 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);
extern int exportfs_encode_fh(struct dentry *dentry, struct fid *fid,
int *max_len, int flags);
static inline int exportfs_encode_fid(struct inode *inode, struct fid *fid,
int *max_len)
{
return exportfs_encode_inode_fh(inode, fid, max_len, NULL,
EXPORT_FH_FID);
}
extern struct dentry *exportfs_decode_fh_raw(struct vfsmount *mnt,
struct fid *fid, int fh_len,
int fileid_type,