exportfs: make ->encode_fh() a mandatory method for NFS export
Rename the default helper for encoding FILEID_INO32_GEN* file handles to generic_encode_ino32_fh() and convert the filesystems that used the default implementation to use the generic helper explicitly. After this change, exportfs_encode_inode_fh() no longer has a default implementation to encode FILEID_INO32_GEN* file handles. This is a step towards allowing filesystems to encode non-decodeable file handles for fanotify without having to implement any export_operations. Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Jeff Layton <jlayton@kernel.org> Acked-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Link: https://lore.kernel.org/r/20231023180801.2953446-3-amir73il@gmail.com Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
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@ -122,12 +122,9 @@ are exportable by setting the s_export_op field in the struct
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super_block. This field must point to a "struct export_operations"
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struct which has the following members:
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encode_fh (optional)
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encode_fh (mandatory)
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Takes a dentry and creates a filehandle fragment which may later be used
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to find or create a dentry for the same object. The default
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implementation creates a filehandle fragment that encodes a 32bit inode
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and generation number for the inode encoded, and if necessary the
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same information for the parent.
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to find or create a dentry for the same object.
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fh_to_dentry (mandatory)
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Given a filehandle fragment, this should find the implied object and
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@ -1045,3 +1045,12 @@ filesystem type is now moved to a later point when the devices are closed:
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As this is a VFS level change it has no practical consequences for filesystems
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other than that all of them must use one of the provided kill_litter_super(),
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kill_anon_super(), or kill_block_super() helpers.
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---
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**mandatory**
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export_operations ->encode_fh() no longer has a default implementation to
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encode FILEID_INO32_GEN* file handles.
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Filesystems that used the default implementation may use the generic helper
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generic_encode_ino32_fh() explicitly.
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@ -568,6 +568,7 @@ static struct dentry *affs_fh_to_parent(struct super_block *sb, struct fid *fid,
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}
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const struct export_operations affs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = affs_fh_to_dentry,
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.fh_to_parent = affs_fh_to_parent,
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.get_parent = affs_get_parent,
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@ -96,6 +96,7 @@ static const struct address_space_operations befs_symlink_aops = {
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};
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static const struct export_operations befs_export_operations = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = befs_fh_to_dentry,
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.fh_to_parent = befs_fh_to_parent,
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.get_parent = befs_get_parent,
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@ -123,6 +123,7 @@ static const struct super_operations efs_superblock_operations = {
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};
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static const struct export_operations efs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = efs_fh_to_dentry,
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.fh_to_parent = efs_fh_to_parent,
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.get_parent = efs_get_parent,
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@ -626,6 +626,7 @@ static struct dentry *erofs_get_parent(struct dentry *child)
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}
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static const struct export_operations erofs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = erofs_fh_to_dentry,
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.fh_to_parent = erofs_fh_to_parent,
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.get_parent = erofs_get_parent,
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@ -343,20 +343,21 @@ out:
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}
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/**
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* export_encode_fh - default export_operations->encode_fh function
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* generic_encode_ino32_fh - generic export_operations->encode_fh function
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* @inode: the object to encode
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* @fid: where to store the file handle fragment
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* @max_len: maximum length to store there
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* @fh: where to store the file handle fragment
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* @max_len: maximum length to store there (in 4 byte units)
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* @parent: parent directory inode, if wanted
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*
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* This default encode_fh function assumes that the 32 inode number
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* This generic encode_fh function assumes that the 32 inode number
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* is suitable for locating an inode, and that the generation number
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* can be used to check that it is still valid. It places them in the
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* filehandle fragment where export_decode_fh expects to find them.
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*/
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static int export_encode_fh(struct inode *inode, struct fid *fid,
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int *max_len, struct inode *parent)
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int generic_encode_ino32_fh(struct inode *inode, __u32 *fh, int *max_len,
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struct inode *parent)
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{
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struct fid *fid = (void *)fh;
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int len = *max_len;
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int type = FILEID_INO32_GEN;
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@ -380,6 +381,7 @@ static int export_encode_fh(struct inode *inode, struct fid *fid,
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*max_len = len;
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return type;
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}
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EXPORT_SYMBOL_GPL(generic_encode_ino32_fh);
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/**
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* exportfs_encode_inode_fh - encode a file handle from inode
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@ -402,7 +404,7 @@ int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
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if (nop && nop->encode_fh)
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return nop->encode_fh(inode, fid->raw, max_len, parent);
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return export_encode_fh(inode, fid, max_len, parent);
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return -EOPNOTSUPP;
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}
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EXPORT_SYMBOL_GPL(exportfs_encode_inode_fh);
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@ -397,6 +397,7 @@ static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
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}
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static const struct export_operations ext2_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = ext2_fh_to_dentry,
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.fh_to_parent = ext2_fh_to_parent,
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.get_parent = ext2_get_parent,
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@ -1646,6 +1646,7 @@ static const struct super_operations ext4_sops = {
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};
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static const struct export_operations ext4_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = ext4_fh_to_dentry,
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.fh_to_parent = ext4_fh_to_parent,
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.get_parent = ext4_get_parent,
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@ -3282,6 +3282,7 @@ static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
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}
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static const struct export_operations f2fs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = f2fs_fh_to_dentry,
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.fh_to_parent = f2fs_fh_to_parent,
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.get_parent = f2fs_get_parent,
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@ -279,6 +279,7 @@ static struct dentry *fat_get_parent(struct dentry *child_dir)
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}
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const struct export_operations fat_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = fat_fh_to_dentry,
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.fh_to_parent = fat_fh_to_parent,
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.get_parent = fat_get_parent,
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@ -150,6 +150,7 @@ static struct dentry *jffs2_get_parent(struct dentry *child)
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}
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static const struct export_operations jffs2_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.get_parent = jffs2_get_parent,
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.fh_to_dentry = jffs2_fh_to_dentry,
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.fh_to_parent = jffs2_fh_to_parent,
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@ -896,6 +896,7 @@ static const struct super_operations jfs_super_operations = {
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};
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static const struct export_operations jfs_export_operations = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = jfs_fh_to_dentry,
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.fh_to_parent = jfs_fh_to_parent,
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.get_parent = jfs_get_parent,
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@ -384,6 +384,7 @@ static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
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* and due to using iget() whereas NTFS needs ntfs_iget().
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*/
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const struct export_operations ntfs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.get_parent = ntfs_get_parent, /* Find the parent of a given
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directory. */
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.fh_to_dentry = ntfs_fh_to_dentry,
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@ -811,6 +811,7 @@ static int ntfs_nfs_commit_metadata(struct inode *inode)
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}
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static const struct export_operations ntfs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = ntfs_fh_to_dentry,
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.fh_to_parent = ntfs_fh_to_parent,
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.get_parent = ntfs3_get_parent,
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@ -41,13 +41,12 @@ static struct dentry *cifs_get_parent(struct dentry *dentry)
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}
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const struct export_operations cifs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.get_parent = cifs_get_parent,
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/* Following five export operations are unneeded so far and can default:
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.get_dentry =
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.get_name =
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.find_exported_dentry =
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.decode_fh =
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.encode_fs = */
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/*
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* Following export operations are mandatory for NFS export support:
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* .fh_to_dentry =
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*/
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};
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#endif /* CONFIG_CIFS_NFSD_EXPORT */
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@ -173,6 +173,7 @@ __le64 *squashfs_read_inode_lookup_table(struct super_block *sb,
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const struct export_operations squashfs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = squashfs_fh_to_dentry,
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.fh_to_parent = squashfs_fh_to_parent,
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.get_parent = squashfs_get_parent
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@ -137,6 +137,7 @@ static struct dentry *ufs_get_parent(struct dentry *child)
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}
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static const struct export_operations ufs_export_ops = {
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.encode_fh = generic_encode_ino32_fh,
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.fh_to_dentry = ufs_fh_to_dentry,
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.fh_to_parent = ufs_fh_to_parent,
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.get_parent = ufs_get_parent,
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@ -235,7 +235,7 @@ extern int exportfs_encode_fh(struct dentry *dentry, struct fid *fid,
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static inline bool exportfs_can_encode_fid(const struct export_operations *nop)
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{
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return nop;
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return nop && nop->encode_fh;
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}
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static inline bool exportfs_can_decode_fh(const struct export_operations *nop)
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@ -279,6 +279,13 @@ extern struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
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/*
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* Generic helpers for filesystems.
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*/
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#ifdef CONFIG_EXPORTFS
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int generic_encode_ino32_fh(struct inode *inode, __u32 *fh, int *max_len,
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struct inode *parent);
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#else
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#define generic_encode_ino32_fh NULL
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#endif
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extern struct dentry *generic_fh_to_dentry(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type,
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struct inode *(*get_inode) (struct super_block *sb, u64 ino, u32 gen));
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