linux-kernel - Re: [PATCH 4/6] ext4: use timespec64 for all inode times

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Message-Id: <9ED1876B-995B-490D-9173-467880FDEA7F@dilger.ca>
Date:   Thu, 21 Jun 2018 11:29:13 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.com>,
        y2038@...ts.linaro.org,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] ext4: use timespec64 for all inode times

On Jun 20, 2018, at 9:33 AM, Arnd Bergmann <arnd@...db.de> wrote:
> 
> This is the last missing piece for the inode times on 32-bit systems:
> now that VFS interfaces use timespec64, we just need to stop truncating
> the tv_sec values for y2038 compatibililty.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> fs/ext4/ext4.h   | 18 +++++++-----------
> fs/ext4/ialloc.c |  2 +-
> 2 files changed, 8 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 0b127853c584..6b4f4369a08c 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -789,17 +789,16 @@ struct move_extent {
>  * affected filesystem before 2242.
>  */
> 
> -static inline __le32 ext4_encode_extra_time(struct timespec *time)
> +static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
> {
> 	u32 extra = sizeof(time->tv_sec) > 4 ?
> 		((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
> 	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
> }
> 
> -static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
> +static inline void ext4_decode_extra_time(struct timespec64 *time, __le32 extra)
> {
> -	if (unlikely(sizeof(time->tv_sec) > 4 &&
> -			(extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
> +	if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
> 
> #if 1
> 		/* Handle legacy encoding of pre-1970 dates with epoch
> @@ -821,9 +820,8 @@ static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
> do {										\
> 	(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);		\
> 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
> -		struct timespec ts = timespec64_to_timespec((inode)->xtime);	\
> 		(raw_inode)->xtime ## _extra =					\
> -				ext4_encode_extra_time(&ts);			\
> +				ext4_encode_extra_time(&(inode)->xtime);	\
> 		}								\
> } while (0)
> 
> @@ -840,10 +838,8 @@ do {									       \
> do {										\
> 	(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);	\
> 	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {	\
> -		struct timespec ts = timespec64_to_timespec((inode)->xtime);	\
> -		ext4_decode_extra_time(&ts,					\
> +		ext4_decode_extra_time(&(inode)->xtime,				\
> 				       raw_inode->xtime ## _extra);		\
> -		(inode)->xtime = timespec_to_timespec64(ts);			\
> 		}								\
> 	else									\
> 		(inode)->xtime.tv_nsec = 0;					\
> @@ -993,9 +989,9 @@ struct ext4_inode_info {
> 
> 	/*
> 	 * File creation time. Its function is same as that of
> -	 * struct timespec i_{a,c,m}time in the generic inode.
> +	 * struct timespec64 i_{a,c,m}time in the generic inode.
> 	 */
> -	struct timespec i_crtime;
> +	struct timespec64 i_crtime;
> 
> 	/* mballoc */
> 	struct list_head i_prealloc_list;
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index f525f909b559..8c00c871f5dc 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -1073,7 +1073,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
> 	/* This is the optimal IO size (for stat), not the fs block size */
> 	inode->i_blocks = 0;
> 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
> -	ei->i_crtime = timespec64_to_timespec(inode->i_mtime);
> +	ei->i_crtime = inode->i_mtime;
> 
> 	memset(ei->i_data, 0, sizeof(ei->i_data));
> 	ei->i_dir_start_lookup = 0;
> --
> 2.9.0
> 


Cheers, Andreas






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