new helper: inode_wrong_type()

stable inclusion
from stable-5.10.63
commit 40ba433a85dbbf5b2e58f2ac6b161ce37ac872fc
bugzilla: 182231 https://gitee.com/openeuler/kernel/issues/I4EFS1

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=40ba433a85dbbf5b2e58f2ac6b161ce37ac872fc

--------------------------------

commit 6e3e2c43 upstream.

inode_wrong_type(inode, mode) returns true if setting inode->i_mode
to given value would've changed the inode type.  We have enough of
those checks open-coded to make a helper worthwhile.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

fs/9p/vfs_inode.c

@@ -398,7 +398,7 @@ static int v9fs_test_inode(struct inode *inode, void *data)
 
 	umode = p9mode2unixmode(v9ses, st, &rdev);
 	/* don't match inode of different type */
-	if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
+	if (inode_wrong_type(inode, umode))
 		return 0;
 
 	/* compare qid details */
@@ -1360,7 +1360,7 @@ int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
 	 * Don't update inode if the file type is different
 	 */
 	umode = p9mode2unixmode(v9ses, st, &rdev);
-	if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
+	if (inode_wrong_type(inode, umode))
 		goto out;
 
 	/*

fs/9p/vfs_inode_dotl.c

@@ -59,7 +59,7 @@ static int v9fs_test_inode_dotl(struct inode *inode, void *data)
 	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 
 	/* don't match inode of different type */
-	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
+	if (inode_wrong_type(inode, st->st_mode))
 		return 0;
 
 	if (inode->i_generation != st->st_gen)
@@ -933,7 +933,7 @@ int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 	/*
 	 * Don't update inode if the file type is different
 	 */
-	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
+	if (inode_wrong_type(inode, st->st_mode))
 		goto out;
 
 	/*

fs/cifs/inode.c

@@ -425,8 +425,7 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 		}
 
 		/* if filetype is different, return error */
-		if (unlikely(((*pinode)->i_mode & S_IFMT) !=
-		    (fattr.cf_mode & S_IFMT))) {
+		if (unlikely(inode_wrong_type(*pinode, fattr.cf_mode))) {
 			CIFS_I(*pinode)->time = 0; /* force reval */
 			rc = -ESTALE;
 			goto cgiiu_exit;
@@ -1243,7 +1242,7 @@ cifs_find_inode(struct inode *inode, void *opaque)
 		return 0;
 
 	/* don't match inode of different type */
-	if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
+	if (inode_wrong_type(inode, fattr->cf_mode))
 		return 0;
 
 	/* if it's not a directory or has no dentries, then flag it */

fs/fuse/dir.c

@@ -252,7 +252,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 		if (ret == -ENOMEM)
 			goto out;
 		if (ret || fuse_invalid_attr(&outarg.attr) ||
-		    (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
+		    inode_wrong_type(inode, outarg.attr.mode))
 			goto invalid;
 
 		forget_all_cached_acls(inode);
@@ -1062,7 +1062,7 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
 	err = fuse_simple_request(fm, &args);
 	if (!err) {
 		if (fuse_invalid_attr(&outarg.attr) ||
-		    (inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
+		    inode_wrong_type(inode, outarg.attr.mode)) {
 			fuse_make_bad(inode);
 			err = -EIO;
 		} else {
@@ -1699,7 +1699,7 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
 	}
 
 	if (fuse_invalid_attr(&outarg.attr) ||
-	    (inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
+	    inode_wrong_type(inode, outarg.attr.mode)) {
 		fuse_make_bad(inode);
 		err = -EIO;
 		goto error;

fs/fuse/inode.c

@@ -340,7 +340,7 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
 		inode->i_generation = generation;
 		fuse_init_inode(inode, attr);
 		unlock_new_inode(inode);
-	} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
+	} else if (inode_wrong_type(inode, attr->mode)) {
 		/* Inode has changed type, any I/O on the old should fail */
 		fuse_make_bad(inode);
 		iput(inode);

fs/fuse/readdir.c

@@ -202,7 +202,7 @@ static int fuse_direntplus_link(struct file *file,
 		inode = d_inode(dentry);
 		if (!inode ||
 		    get_node_id(inode) != o->nodeid ||
-		    ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
+		    inode_wrong_type(inode, o->attr.mode)) {
 			d_invalidate(dentry);
 			dput(dentry);
 			goto retry;

fs/nfs/inode.c

@@ -322,7 +322,7 @@ nfs_find_actor(struct inode *inode, void *opaque)
 
 	if (NFS_FILEID(inode) != fattr->fileid)
 		return 0;
-	if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
+	if (inode_wrong_type(inode, fattr->mode))
 		return 0;
 	if (nfs_compare_fh(NFS_FH(inode), fh))
 		return 0;
@@ -1446,7 +1446,7 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
 			return 0;
 		return -ESTALE;
 	}
-	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
+	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
 		return -ESTALE;
 
 
@@ -1861,7 +1861,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 	/*
 	 * Make sure the inode's type hasn't changed.
 	 */
-	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
+	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
 		/*
 		* Big trouble! The inode has become a different object.
 		*/

fs/nfsd/nfsproc.c

@@ -376,7 +376,7 @@ nfsd_proc_create(struct svc_rqst *rqstp)
 
 		/* Make sure the type and device matches */
 		resp->status = nfserr_exist;
-		if (inode && type != (inode->i_mode & S_IFMT))
+		if (inode && inode_wrong_type(inode, type))
 			goto out_unlock;
 	}
 

fs/overlayfs/namei.c

@@ -366,7 +366,7 @@ int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
 		return PTR_ERR(origin);
 
 	if (upperdentry && !ovl_is_whiteout(upperdentry) &&
-	    ((d_inode(origin)->i_mode ^ d_inode(upperdentry)->i_mode) & S_IFMT))
+	    inode_wrong_type(d_inode(upperdentry), d_inode(origin)->i_mode))
 		goto invalid;
 
 	if (!*stackp)
@@ -724,7 +724,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
 		index = ERR_PTR(-ESTALE);
 		goto out;
 	} else if (ovl_dentry_weird(index) || ovl_is_whiteout(index) ||
-		   ((inode->i_mode ^ d_inode(origin)->i_mode) & S_IFMT)) {
+		   inode_wrong_type(inode, d_inode(origin)->i_mode)) {
 		/*
 		 * Index should always be of the same file type as origin
 		 * except for the case of a whiteout index. A whiteout

include/linux/fs.h

@@ -2775,6 +2775,11 @@ static inline bool execute_ok(struct inode *inode)
 	return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
 }
 
+static inline bool inode_wrong_type(const struct inode *inode, umode_t mode)
+{
+	return (inode->i_mode ^ mode) & S_IFMT;
+}
+
 static inline void file_start_write(struct file *file)
 {
 	if (!S_ISREG(file_inode(file)->i_mode))