ecryptfs: merge ecryptfs_inode_newsize_ok into truncate_upper

Both callers of ecryptfs_inode_newsize_ok call truncate_upper right
after.  Merge ecryptfs_inode_newsize_ok into truncate_upper to simplify
the logic.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Tyler Hicks <[email protected]>

Author: Christoph Hellwig

fs/ecryptfs/inode.c

@@ -738,6 +738,23 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 		return 0;
 	}
 
+	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
+	lower_size_before_truncate =
+		upper_size_to_lower_size(crypt_stat, i_size);
+	lower_size_after_truncate =
+		upper_size_to_lower_size(crypt_stat, ia->ia_size);
+	if (lower_size_after_truncate > lower_size_before_truncate) {
+		/*
+		 * The eCryptfs inode and the new *lower* size are mixed here
+		 * because we may not have the lower i_mutex held and/or it may
+		 * not be appropriate to call inode_newsize_ok() with inodes
+		 * from other filesystems.
+		 */
+		rc = inode_newsize_ok(inode, lower_size_after_truncate);
+		if (rc)
+			return rc;
+	}
+
 	rc = ecryptfs_get_lower_file(dentry, inode);
 	if (rc)
 		return rc;
@@ -756,7 +773,6 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 		goto out;
 	}
 
-	crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
 	if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 		truncate_setsize(inode, ia->ia_size);
 		lower_ia->ia_size = ia->ia_size;
@@ -791,10 +807,6 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 	 * We are reducing the size of the ecryptfs file, and need to know if we
 	 * need to reduce the size of the lower file.
 	 */
-	lower_size_before_truncate =
-		upper_size_to_lower_size(crypt_stat, i_size);
-	lower_size_after_truncate =
-		upper_size_to_lower_size(crypt_stat, ia->ia_size);
 	if (lower_size_after_truncate < lower_size_before_truncate) {
 		lower_ia->ia_size = lower_size_after_truncate;
 		lower_ia->ia_valid |= ATTR_SIZE;
@@ -806,28 +818,6 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 	return rc;
 }
 
-static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
-{
-	struct ecryptfs_crypt_stat *crypt_stat;
-	loff_t lower_oldsize, lower_newsize;
-
-	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
-	lower_oldsize = upper_size_to_lower_size(crypt_stat,
-						 i_size_read(inode));
-	lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
-	if (lower_newsize > lower_oldsize) {
-		/*
-		 * The eCryptfs inode and the new *lower* size are mixed here
-		 * because we may not have the lower i_mutex held and/or it may
-		 * not be appropriate to call inode_newsize_ok() with inodes
-		 * from other filesystems.
-		 */
-		return inode_newsize_ok(inode, lower_newsize);
-	}
-
-	return 0;
-}
-
 /**
  * ecryptfs_truncate
  * @dentry: The ecryptfs layer dentry
@@ -844,10 +834,6 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 	struct iattr lower_ia = { .ia_valid = 0 };
 	int rc;
 
-	rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
-	if (rc)
-		return rc;
-
 	rc = truncate_upper(dentry, &ia, &lower_ia);
 	if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 		struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
@@ -939,10 +925,6 @@ static int ecryptfs_setattr(struct mnt_idmap *idmap,
 	if (ia->ia_valid & ATTR_FILE)
 		lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 	if (ia->ia_valid & ATTR_SIZE) {
-		rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
-		if (rc)
-			goto out;
-
 		rc = truncate_upper(dentry, ia, &lower_ia);
 		if (rc < 0)
 			goto out;