Patch "quota: propagate error from __dquot_initialize" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    quota: propagate error from __dquot_initialize

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     quota-propagate-error-from-__dquot_initialize.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Feb  1 13:45:42 CET 2018
From: Chao Yu <yuchao0@huawei.com>
Date: Tue, 28 Nov 2017 23:01:44 +0800
Subject: quota: propagate error from __dquot_initialize

From: Chao Yu <yuchao0@huawei.com>


[ Upstream commit 1a6152d36dee08da2be2a3030dceb45ef680460a ]

In commit 6184fc0b8dd7 ("quota: Propagate error from ->acquire_dquot()"),
we have propagated error from __dquot_initialize to caller, but we forgot
to handle such error in add_dquot_ref(), so, currently, during quota
accounting information initialization flow, if we failed for some of
inodes, we just ignore such error, and do account for others, which is
not a good implementation.

In this patch, we choose to let user be aware of such error, so after
turning on quota successfully, we can make sure all inodes disk usage
can be accounted, which will be more reasonable.

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/quota/dquot.c |   19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -934,12 +934,13 @@ static int dqinit_needed(struct inode *i
 }
 
 /* This routine is guarded by s_umount semaphore */
-static void add_dquot_ref(struct super_block *sb, int type)
+static int add_dquot_ref(struct super_block *sb, int type)
 {
 	struct inode *inode, *old_inode = NULL;
 #ifdef CONFIG_QUOTA_DEBUG
 	int reserved = 0;
 #endif
+	int err = 0;
 
 	spin_lock(&sb->s_inode_list_lock);
 	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
@@ -959,7 +960,11 @@ static void add_dquot_ref(struct super_b
 			reserved = 1;
 #endif
 		iput(old_inode);
-		__dquot_initialize(inode, type);
+		err = __dquot_initialize(inode, type);
+		if (err) {
+			iput(inode);
+			goto out;
+		}
 
 		/*
 		 * We hold a reference to 'inode' so it couldn't have been
@@ -974,7 +979,7 @@ static void add_dquot_ref(struct super_b
 	}
 	spin_unlock(&sb->s_inode_list_lock);
 	iput(old_inode);
-
+out:
 #ifdef CONFIG_QUOTA_DEBUG
 	if (reserved) {
 		quota_error(sb, "Writes happened before quota was turned on "
@@ -982,6 +987,7 @@ static void add_dquot_ref(struct super_b
 			"Please run quotacheck(8)");
 	}
 #endif
+	return err;
 }
 
 /*
@@ -2372,10 +2378,11 @@ static int vfs_load_quota_inode(struct i
 	dqopt->flags |= dquot_state_flag(flags, type);
 	spin_unlock(&dq_state_lock);
 
-	add_dquot_ref(sb, type);
-
-	return 0;
+	error = add_dquot_ref(sb, type);
+	if (error)
+		dquot_disable(sb, type, flags);
 
+	return error;
 out_file_init:
 	dqopt->files[type] = NULL;
 	iput(inode);


Patches currently in stable-queue which might be from yuchao0@huawei.com are

queue-4.14/quota-propagate-error-from-__dquot_initialize.patch