ovl: propagate ovl_fs to ovl_decode_real_fh and ovl_encode_real_fh

This will be used in next patch to be able to change uuid checks and add
uuid nullification based on ofs->config.index for a new "uuid=off" mode.
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/copy_up.c

@@ -275,7 +275,8 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
 	return err;
 }
 
-struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper)
+struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
+				  bool is_upper)
 {
 	struct ovl_fh *fh;
 	int fh_type, dwords;
@@ -328,8 +329,8 @@ struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper)
 	return ERR_PTR(err);
 }
 
-int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
-		   struct dentry *upper)
+int ovl_set_origin(struct ovl_fs *ofs, struct dentry *dentry,
+		   struct dentry *lower, struct dentry *upper)
 {
 	const struct ovl_fh *fh = NULL;
 	int err;
@@ -340,7 +341,7 @@ int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
 	 * up and a pure upper inode.
 	 */
 	if (ovl_can_decode_fh(lower->d_sb)) {
-		fh = ovl_encode_real_fh(lower, false);
+		fh = ovl_encode_real_fh(ofs, lower, false);
 		if (IS_ERR(fh))
 			return PTR_ERR(fh);
 	}
@@ -362,7 +363,7 @@ static int ovl_set_upper_fh(struct ovl_fs *ofs, struct dentry *upper,
 	const struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(upper, true);
+	fh = ovl_encode_real_fh(ofs, upper, true);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 
@@ -380,6 +381,7 @@ static int ovl_set_upper_fh(struct ovl_fs *ofs, struct dentry *upper,
 static int ovl_create_index(struct dentry *dentry, struct dentry *origin,
 			    struct dentry *upper)
 {
+	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
 	struct dentry *indexdir = ovl_indexdir(dentry->d_sb);
 	struct inode *dir = d_inode(indexdir);
 	struct dentry *index = NULL;
@@ -402,7 +404,7 @@ static int ovl_create_index(struct dentry *dentry, struct dentry *origin,
 	if (WARN_ON(ovl_test_flag(OVL_INDEX, d_inode(dentry))))
 		return -EIO;
 
-	err = ovl_get_index_name(origin, &name);
+	err = ovl_get_index_name(ofs, origin, &name);
 	if (err)
 		return err;
 
@@ -411,7 +413,7 @@ static int ovl_create_index(struct dentry *dentry, struct dentry *origin,
 	if (IS_ERR(temp))
 		goto free_name;
 
-	err = ovl_set_upper_fh(OVL_FS(dentry->d_sb), upper, temp);
+	err = ovl_set_upper_fh(ofs, upper, temp);
 	if (err)
 		goto out;
 
@@ -521,7 +523,7 @@ static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
 	 * hard link.
 	 */
 	if (c->origin) {
-		err = ovl_set_origin(c->dentry, c->lowerpath.dentry, temp);
+		err = ovl_set_origin(ofs, c->dentry, c->lowerpath.dentry, temp);
 		if (err)
 			return err;
 	}
@@ -700,7 +702,7 @@ static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c)
 static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
 {
 	int err;
-	struct ovl_fs *ofs = c->dentry->d_sb->s_fs_info;
+	struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb);
 	bool to_index = false;
 
 	/*
@@ -722,7 +724,7 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
 
 	if (to_index) {
 		c->destdir = ovl_indexdir(c->dentry->d_sb);
-		err = ovl_get_index_name(c->lowerpath.dentry, &c->destname);
+		err = ovl_get_index_name(ofs, c->lowerpath.dentry, &c->destname);
 		if (err)
 			return err;
 	} else if (WARN_ON(!c->parent)) {

fs/overlayfs/export.c

@@ -211,7 +211,8 @@ static int ovl_check_encode_origin(struct dentry *dentry)
 	return 1;
 }
 
-static int ovl_dentry_to_fid(struct dentry *dentry, u32 *fid, int buflen)
+static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,
+			     u32 *fid, int buflen)
 {
 	struct ovl_fh *fh = NULL;
 	int err, enc_lower;
@@ -226,7 +227,7 @@ static int ovl_dentry_to_fid(struct dentry *dentry, u32 *fid, int buflen)
 		goto fail;
 
 	/* Encode an upper or lower file handle */
-	fh = ovl_encode_real_fh(enc_lower ? ovl_dentry_lower(dentry) :
+	fh = ovl_encode_real_fh(ofs, enc_lower ? ovl_dentry_lower(dentry) :
 				ovl_dentry_upper(dentry), !enc_lower);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
@@ -249,6 +250,7 @@ static int ovl_dentry_to_fid(struct dentry *dentry, u32 *fid, int buflen)
 static int ovl_encode_fh(struct inode *inode, u32 *fid, int *max_len,
 			 struct inode *parent)
 {
+	struct ovl_fs *ofs = OVL_FS(inode->i_sb);
 	struct dentry *dentry;
 	int bytes, buflen = *max_len << 2;
 
@@ -260,7 +262,7 @@ static int ovl_encode_fh(struct inode *inode, u32 *fid, int *max_len,
 	if (WARN_ON(!dentry))
 		return FILEID_INVALID;
 
-	bytes = ovl_dentry_to_fid(dentry, fid, buflen);
+	bytes = ovl_dentry_to_fid(ofs, dentry, fid, buflen);
 	dput(dentry);
 	if (bytes <= 0)
 		return FILEID_INVALID;
@@ -680,7 +682,7 @@ static struct dentry *ovl_upper_fh_to_d(struct super_block *sb,
 	if (!ovl_upper_mnt(ofs))
 		return ERR_PTR(-EACCES);
 
-	upper = ovl_decode_real_fh(fh, ovl_upper_mnt(ofs), true);
+	upper = ovl_decode_real_fh(ofs, fh, ovl_upper_mnt(ofs), true);
 	if (IS_ERR_OR_NULL(upper))
 		return upper;
 

fs/overlayfs/namei.c

@@ -150,8 +150,8 @@ static struct ovl_fh *ovl_get_fh(struct ovl_fs *ofs, struct dentry *dentry,
 	goto out;
 }
 
-struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt,
-				  bool connected)
+struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
+				  struct vfsmount *mnt, bool connected)
 {
 	struct dentry *real;
 	int bytes;
@@ -354,7 +354,7 @@ int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
 		    ofs->layers[i].fs->bad_uuid)
 			continue;
 
-		origin = ovl_decode_real_fh(fh, ofs->layers[i].mnt,
+		origin = ovl_decode_real_fh(ofs, fh, ofs->layers[i].mnt,
 					    connected);
 		if (origin)
 			break;
@@ -450,7 +450,7 @@ int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
 	struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(real, is_upper);
+	fh = ovl_encode_real_fh(ofs, real, is_upper);
 	err = PTR_ERR(fh);
 	if (IS_ERR(fh)) {
 		fh = NULL;
@@ -488,7 +488,7 @@ struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index)
 	if (IS_ERR_OR_NULL(fh))
 		return ERR_CAST(fh);
 
-	upper = ovl_decode_real_fh(fh, ovl_upper_mnt(ofs), true);
+	upper = ovl_decode_real_fh(ofs, fh, ovl_upper_mnt(ofs), true);
 	kfree(fh);
 
 	if (IS_ERR_OR_NULL(upper))
@@ -640,12 +640,13 @@ static int ovl_get_index_name_fh(struct ovl_fh *fh, struct qstr *name)
  * index dir was cleared. Either way, that index cannot be used to indentify
  * the overlay inode.
  */
-int ovl_get_index_name(struct dentry *origin, struct qstr *name)
+int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
+		       struct qstr *name)
 {
 	struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(origin, false);
+	fh = ovl_encode_real_fh(ofs, origin, false);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 
@@ -694,7 +695,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
 	bool is_dir = d_is_dir(origin);
 	int err;
 
-	err = ovl_get_index_name(origin, &name);
+	err = ovl_get_index_name(ofs, origin, &name);
 	if (err)
 		return ERR_PTR(err);
 
@@ -805,7 +806,7 @@ static int ovl_fix_origin(struct ovl_fs *ofs, struct dentry *dentry,
 	if (err)
 		return err;
 
-	err = ovl_set_origin(dentry, lower, upper);
+	err = ovl_set_origin(ofs, dentry, lower, upper);
 	if (!err)
 		err = ovl_set_impure(dentry->d_parent, upper->d_parent);
 

fs/overlayfs/overlayfs.h

@@ -383,8 +383,8 @@ static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len)
 	return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET);
 }
 
-struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt,
-				  bool connected);
+struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
+				  struct vfsmount *mnt, bool connected);
 int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
 			struct dentry *upperdentry, struct ovl_path **stackp);
 int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
@@ -392,7 +392,8 @@ int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
 		      bool set);
 struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index);
 int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index);
-int ovl_get_index_name(struct dentry *origin, struct qstr *name);
+int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
+		       struct qstr *name);
 struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh);
 struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
 				struct dentry *origin, bool verify);
@@ -514,9 +515,10 @@ int ovl_maybe_copy_up(struct dentry *dentry, int flags);
 int ovl_copy_xattr(struct super_block *sb, struct dentry *old,
 		   struct dentry *new);
 int ovl_set_attr(struct dentry *upper, struct kstat *stat);
-struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper);
-int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
-		   struct dentry *upper);
+struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
+				  bool is_upper);
+int ovl_set_origin(struct ovl_fs *ofs, struct dentry *dentry,
+		   struct dentry *lower, struct dentry *upper);
 
 /* export.c */
 extern const struct export_operations ovl_export_operations;

fs/overlayfs/util.c

@@ -716,6 +716,7 @@ bool ovl_need_index(struct dentry *dentry)
 /* Caller must hold OVL_I(inode)->lock */
 static void ovl_cleanup_index(struct dentry *dentry)
 {
+	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
 	struct dentry *indexdir = ovl_indexdir(dentry->d_sb);
 	struct inode *dir = indexdir->d_inode;
 	struct dentry *lowerdentry = ovl_dentry_lower(dentry);
@@ -725,7 +726,7 @@ static void ovl_cleanup_index(struct dentry *dentry)
 	struct qstr name = { };
 	int err;
 
-	err = ovl_get_index_name(lowerdentry, &name);
+	err = ovl_get_index_name(ofs, lowerdentry, &name);
 	if (err)
 		goto fail;