linux-ext4 - [PATCH 04/13] fat: only specify I_DIRTY_TIME when needed in fat_update

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Date:   Mon,  4 Jan 2021 16:54:43 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-xfs@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH 04/13] fat: only specify I_DIRTY_TIME when needed in fat_update_time()

From: Eric Biggers <ebiggers@...gle.com>

As was done for generic_update_time(), only pass I_DIRTY_TIME to
__mark_inode_dirty() when the inode's timestamps were actually updated
and lazytime is enabled.  This avoids a weird edge case where
I_DIRTY_TIME could be set in i_state when lazytime isn't enabled.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/fat/misc.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index f1b2a1fc2a6a4..33e1e0c9fd634 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -329,21 +329,22 @@ EXPORT_SYMBOL_GPL(fat_truncate_time);
 
 int fat_update_time(struct inode *inode, struct timespec64 *now, int flags)
 {
-	int iflags = I_DIRTY_TIME;
-	bool dirty = false;
+	int dirty_flags = 0;
 
 	if (inode->i_ino == MSDOS_ROOT_INO)
 		return 0;
 
-	fat_truncate_time(inode, now, flags);
-	if (flags & S_VERSION)
-		dirty = inode_maybe_inc_iversion(inode, false);
-	if ((flags & (S_ATIME | S_CTIME | S_MTIME)) &&
-	    !(inode->i_sb->s_flags & SB_LAZYTIME))
-		dirty = true;
+	if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
+		fat_truncate_time(inode, now, flags);
+		if (inode->i_sb->s_flags & SB_LAZYTIME)
+			dirty_flags |= I_DIRTY_TIME;
+		else
+			dirty_flags |= I_DIRTY_SYNC;
+	}
+
+	if ((flags & S_VERSION) && inode_maybe_inc_iversion(inode, false))
+		dirty_flags |= I_DIRTY_SYNC;
 
-	if (dirty)
-		iflags |= I_DIRTY_SYNC;
 	__mark_inode_dirty(inode, iflags);
 	return 0;
 }
-- 
2.30.0