Revert "ubifs: xattr: Don't operate on deleted inodes"

This reverts commit 11a6fc3.
UBIFS wants to assert that xattr operations are only issued on files
with positive link count. The said patch made this operations return
-ENOENT for unlinked files such that the asserts will no longer trigger.
This was wrong since xattr operations are perfectly fine on unlinked
files.
Instead the assertions need to be fixed/removed.

Cc: <[email protected]>
Fixes: 11a6fc3 ("ubifs: xattr: Don't operate on deleted inodes")
Reported-by: Koen Vandeputte <[email protected]>
Tested-by: Joel Stanley <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

Author: richardweinberger

fs/ubifs/xattr.c

@@ -152,12 +152,6 @@ static int create_xattr(struct ubifs_info *c, struct inode *host,
 	ui->data_len = size;
 
 	mutex_lock(&host_ui->ui_mutex);
-
-	if (!host->i_nlink) {
-		err = -ENOENT;
-		goto out_noent;
-	}
-
 	host->i_ctime = current_time(host);
 	host_ui->xattr_cnt += 1;
 	host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
@@ -190,7 +184,6 @@ static int create_xattr(struct ubifs_info *c, struct inode *host,
 	host_ui->xattr_size -= CALC_XATTR_BYTES(size);
 	host_ui->xattr_names -= fname_len(nm);
 	host_ui->flags &= ~UBIFS_CRYPT_FL;
-out_noent:
 	mutex_unlock(&host_ui->ui_mutex);
 out_free:
 	make_bad_inode(inode);
@@ -242,12 +235,6 @@ static int change_xattr(struct ubifs_info *c, struct inode *host,
 	mutex_unlock(&ui->ui_mutex);
 
 	mutex_lock(&host_ui->ui_mutex);
-
-	if (!host->i_nlink) {
-		err = -ENOENT;
-		goto out_noent;
-	}
-
 	host->i_ctime = current_time(host);
 	host_ui->xattr_size -= CALC_XATTR_BYTES(old_size);
 	host_ui->xattr_size += CALC_XATTR_BYTES(size);
@@ -269,7 +256,6 @@ static int change_xattr(struct ubifs_info *c, struct inode *host,
 out_cancel:
 	host_ui->xattr_size -= CALC_XATTR_BYTES(size);
 	host_ui->xattr_size += CALC_XATTR_BYTES(old_size);
-out_noent:
 	mutex_unlock(&host_ui->ui_mutex);
 	make_bad_inode(inode);
 out_free:
@@ -496,12 +482,6 @@ static int remove_xattr(struct ubifs_info *c, struct inode *host,
 		return err;
 
 	mutex_lock(&host_ui->ui_mutex);
-
-	if (!host->i_nlink) {
-		err = -ENOENT;
-		goto out_noent;
-	}
-
 	host->i_ctime = current_time(host);
 	host_ui->xattr_cnt -= 1;
 	host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm));
@@ -521,7 +501,6 @@ static int remove_xattr(struct ubifs_info *c, struct inode *host,
 	host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
 	host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len);
 	host_ui->xattr_names += fname_len(nm);
-out_noent:
 	mutex_unlock(&host_ui->ui_mutex);
 	ubifs_release_budget(c, &req);
 	make_bad_inode(inode);
@@ -561,9 +540,6 @@ static int ubifs_xattr_remove(struct inode *host, const char *name)
 
 	ubifs_assert(c, inode_is_locked(host));
 
-	if (!host->i_nlink)
-		return -ENOENT;
-
 	if (fname_len(&nm) > UBIFS_MAX_NLEN)
 		return -ENAMETOOLONG;