[PATCH 2/4] ubifs: Don't add fscrypt context to xattrs

[Richard Weinberger]

In UBIFS xattrs are inodes too, make sure that these inodes
don't get a fscrypt context.
Otherwise we will end up with undeletable xattrs which will
waste memory on the flash.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: d475a507457b ("ubifs: Add skeleton for fscrypto")
Signed-off-by: Richard Weinberger <richard@xxxxxx>
---
 fs/ubifs/dir.c   | 23 +++++++++++++----------
 fs/ubifs/ubifs.h |  2 +-
 fs/ubifs/xattr.c |  2 +-
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 04912dedca48..8a34e0118ee9 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -68,13 +68,14 @@ static int inherit_flags(const struct inode *dir, umode_t mode)
  * @c: UBIFS file-system description object
  * @dir: parent directory inode
  * @mode: inode mode flags
+ * @omit_fscrypt_ctx: Don't create a fscrypt context for this inode
  *
  * This function finds an unused inode number, allocates new inode and
  * initializes it. Returns new inode in case of success and an error code in
  * case of failure.
  */
 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
-			      umode_t mode)
+			      umode_t mode, int omit_fscrypt_ctx)
 {
 	int err;
 	struct inode *inode;
@@ -99,10 +100,12 @@ struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
 			 current_time(inode);
 	inode->i_mapping->nrpages = 0;
 
-	err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
-	if (err) {
-		ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
-		goto out_iput;
+	if (!omit_fscrypt_ctx) {
+		err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
+		if (err) {
+			ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
+			goto out_iput;
+		}
 	}
 
 	switch (mode & S_IFMT) {
@@ -309,7 +312,7 @@ static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 
 	sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
-	inode = ubifs_new_inode(c, dir, mode);
+	inode = ubifs_new_inode(c, dir, mode, 0);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		goto out_fname;
@@ -385,7 +388,7 @@ static int do_tmpfile(struct inode *dir, struct dentry *dentry,
 		return err;
 	}
 
-	inode = ubifs_new_inode(c, dir, mode);
+	inode = ubifs_new_inode(c, dir, mode, 0);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		goto out_budg;
@@ -971,7 +974,7 @@ static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 
 	sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
-	inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
+	inode = ubifs_new_inode(c, dir, S_IFDIR | mode, 0);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		goto out_fname;
@@ -1058,7 +1061,7 @@ static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
 
 	sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
-	inode = ubifs_new_inode(c, dir, mode);
+	inode = ubifs_new_inode(c, dir, mode, 0);
 	if (IS_ERR(inode)) {
 		kfree(dev);
 		err = PTR_ERR(inode);
@@ -1140,7 +1143,7 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
 
 	sz_change = CALC_DENT_SIZE(fname_len(&nm));
 
-	inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
+	inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO, 0);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		goto out_fname;
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index fc2cdde3b549..dc9b6ba41e77 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1994,7 +1994,7 @@ int ubifs_update_time(struct inode *inode, struct timespec64 *time, int flags);
 
 /* dir.c */
 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
-			      umode_t mode);
+			      umode_t mode, int omit_fscrypt_ctx);
 int ubifs_getattr(const struct path *path, struct kstat *stat,
 		  u32 request_mask, unsigned int flags);
 int ubifs_check_dir_empty(struct inode *dir);
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index a0b9b349efe6..430abe9e56af 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -110,7 +110,7 @@ static int create_xattr(struct ubifs_info *c, struct inode *host,
 	if (err)
 		return err;
 
-	inode = ubifs_new_inode(c, host, S_IFREG | S_IRWXUGO);
+	inode = ubifs_new_inode(c, host, S_IFREG | S_IRWXUGO, 1);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		goto out_budg;
-- 
2.26.2