linux-next: build failure after merge of the vfs tree

[Stephen Rothwell <sfr@canb.auug.org.au>]

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Hi Al,

After merging the vfs tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

/home/sfr/next/next/fs/f2fs/super.c: In function 'f2fs_remount':
/home/sfr/next/next/fs/f2fs/super.c:1589:16: error: 'MS_RDONLY' undeclared (first use in this function); did you mean 'IS_RDONLY'?
  if ((*flags & MS_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
                ^~~~~~~~~
                IS_RDONLY

Caused by commit

  dcf8001d292b ("vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled")

interacting with commit

  f80f781514ef ("f2fs: checkpoint disabling")

from the f2fs tree.

I have added the following merge fix patch for today.  If it is correct,
I assume that it could be applied to f2fs tree as the the other uses of
MS_RDONLY have already been changed to SB_RDONLY.  (There is another
use of MS_READONLY in this function that is already cleaned up in the
vfs tree commit.)

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Wed, 3 Oct 2018 10:27:04 +1000
Subject: [PATCH] f2fs: update for MS_* flags mostly going away

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
 fs/f2fs/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 6ed77589ff2b..b612a9e4a35e 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1586,7 +1586,7 @@ static int f2fs_remount(struct super_block *sb, int *flags,
 		goto restore_opts;
 	}
 
-	if ((*flags & MS_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
+	if ((*flags & SB_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
 		err = -EINVAL;
 		f2fs_msg(sbi->sb, KERN_WARNING,
 			"disabling checkpoint not compatible with read-only");
-- 
2.18.0

-- 
Cheers,
Stephen Rothwell

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