diff mbox series

[04/13] fat: only specify I_DIRTY_TIME when needed in fat_update_time()

Message ID 20210105005452.92521-5-ebiggers@kernel.org (mailing list archive)
State New
Headers show
Series lazytime fixes and cleanups | expand

Commit Message

Eric Biggers Jan. 5, 2021, 12:54 a.m. UTC
From: Eric Biggers <ebiggers@google.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@google.com>
---
 fs/fat/misc.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

Comments

Jan Kara Jan. 7, 2021, 1:13 p.m. UTC | #1
On Mon 04-01-21 16:54:43, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.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@google.com>

...
> +	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);
				  ^^^ dirty_flags here?

Otherwise the change looks good to me.

								Honza
Eric Biggers Jan. 7, 2021, 7:10 p.m. UTC | #2
On Thu, Jan 07, 2021 at 02:13:28PM +0100, Jan Kara wrote:
> On Mon 04-01-21 16:54:43, Eric Biggers wrote:
> > From: Eric Biggers <ebiggers@google.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@google.com>
> 
> ...
> > +	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);
> 				  ^^^ dirty_flags here?
> 
> Otherwise the change looks good to me.

Yeah, I'll fix that.  I accidentally didn't have CONFIG_FAT_FS enabled.

- Eric
diff mbox series

Patch

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;
 }