[PATCH v2 04/12] fat: only specify I_DIRTY_TIME when needed in fat_update_time()

Eric Biggers
2021-01-09T08:00:42Z

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 | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index f1b2a1fc2a6a4..18a50a46b57f8 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -329,22 +329,23 @@ 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);
+ __mark_inode_dirty(inode, dirty_flags);
return 0;
}
EXPORT_SYMBOL_GPL(fat_update_time);
--
2.30.0