Re: [PATCH v2 00/89] fs: new accessors for inode->i_ctime

Jeff Layton
2023-07-07T12:42:50Z

On Wed, 2023-07-05 at 14:58 -0400, Jeff Layton wrote:
> v2:
> - prepend patches to add missing ctime updates
> - add simple_rename_timestamp helper function
> - rename ctime accessor functions as inode_get_ctime/inode_set_ctime_*
> - drop individual inode_ctime_set_{sec,nsec} helpers
>

After review by Jan and others, and Jan's ext4 rework, the diff on top
of the series I posted a couple of days ago is below. I don't really
want to spam everyone with another ~100 patch v3 series, but I can if
you think that's best.

Christian, what would you like me to do here?

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index bcdb1a0beccf..5f6e93714f5a 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -699,8 +699,7 @@ void ceph_fill_file_time(struct inode *inode, int issued,
if (ci->i_version == 0 ||
timespec64_compare(ctime, &ictime) > 0) {
dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
- inode_get_ctime(inode).tv_sec,
- inode_get_ctime(inode).tv_nsec,
+ ictime.tv_sec, ictime.tv_nsec,
ctime->tv_sec, ctime->tv_nsec);
inode_set_ctime_to_ts(inode, *ctime);
}
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 806374d866d1..567c0d305ea4 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -175,10 +175,7 @@ static void *erofs_read_inode(struct erofs_buf *buf,
vi->chunkbits = sb->s_blocksize_bits +
(vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
}
- inode->i_mtime.tv_sec = inode_get_ctime(inode).tv_sec;
- inode->i_atime.tv_sec = inode_get_ctime(inode).tv_sec;
- inode->i_mtime.tv_nsec = inode_get_ctime(inode).tv_nsec;
- inode->i_atime.tv_nsec = inode_get_ctime(inode).tv_nsec;
+ inode->i_mtime = inode->i_atime = inode_get_ctime(inode);

inode->i_flags &= ~S_DAX;
if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index c007de6ac1c7..1b9f587f6cca 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -1351,7 +1351,7 @@ static int exfat_rename(struct mnt_idmap *idmap,
exfat_warn(sb, "abnormal access to an inode dropped");
WARN_ON(new_inode->i_nlink == 0);
}
- EXFAT_I(new_inode)->i_crtime = inode_set_ctime_current(new_inode);
+ EXFAT_I(new_inode)->i_crtime = current_time(new_inode);
}

unlock:
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index d502b930431b..d63543187359 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -868,64 +868,63 @@ struct ext4_inode {
* affected filesystem before 2242.
*/

-static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
+static inline __le32 ext4_encode_extra_time(struct timespec64 ts)
{
- u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
- return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
+ u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK;
+ return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS));
}

-static inline void ext4_decode_extra_time(struct timespec64 *time,
- __le32 extra)
+static inline struct timespec64 ext4_decode_extra_time(__le32 base,
+ __le32 extra)
{
+ struct timespec64 ts = { .tv_sec = le32_to_cpu(base) };
+
if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
- time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
- time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
+ ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
+ ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
+ return ts;
}

-#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
+#define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \
do { \
- if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
- (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
- (raw_inode)->xtime ## _extra = \
- ext4_encode_extra_time(&(inode)->xtime); \
- } \
- else \
- (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
+ if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
+ (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \
+ (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \
+ } else \
+ (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \
} while (0)

+#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
+ EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, (inode)->xtime)
+
+#define EXT4_INODE_SET_CTIME(inode, raw_inode) \
+ EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode))
+
#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
-do { \
- if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
- (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
- if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
- (raw_inode)->xtime ## _extra = \
- ext4_encode_extra_time(&(einode)->xtime); \
-} while (0)
+ EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), raw_inode, (einode)->xtime)
+
+#define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \
+ (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \
+ ext4_decode_extra_time((raw_inode)->xtime, \
+ (raw_inode)->xtime ## _extra) : \
+ (struct timespec64) { \
+ .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \
+ })

#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
do { \
- (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
- if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
- ext4_decode_extra_time(&(inode)->xtime, \
- raw_inode->xtime ## _extra); \
- } \
- else \
- (inode)->xtime.tv_nsec = 0; \
+ (inode)->xtime = EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode); \
} while (0)

+#define EXT4_INODE_GET_CTIME(inode, raw_inode) \
+do { \
+ inode_set_ctime_to_ts(inode, \
+ EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \
+} while (0)

#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
do { \
- if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
- (einode)->xtime.tv_sec = \
- (signed)le32_to_cpu((raw_inode)->xtime); \
- else \
- (einode)->xtime.tv_sec = 0; \
- if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
- ext4_decode_extra_time(&(einode)->xtime, \
- raw_inode->xtime ## _extra); \
- else \
- (einode)->xtime.tv_nsec = 0; \
+ (einode)->xtime = EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), raw_inode); \
} while (0)

#define i_disk_version osd1.linux1.l_i_version
@@ -3823,27 +3822,6 @@ static inline int ext4_buffer_uptodate(struct buffer_head *bh)
return buffer_uptodate(bh);
}

-static inline void ext4_inode_set_ctime(struct inode *inode, struct ext4_inode *raw_inode)
-{
- struct timespec64 ctime = inode_get_ctime(inode);
-
- if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), i_ctime_extra)) {
- raw_inode->i_ctime = cpu_to_le32(ctime.tv_sec);
- raw_inode->i_ctime_extra = ext4_encode_extra_time(&ctime);
- } else {
- raw_inode->i_ctime = cpu_to_le32(clamp_t(int32_t, ctime.tv_sec, S32_MIN, S32_MAX));
- }
-}
-
-static inline void ext4_inode_get_ctime(struct inode *inode, const struct ext4_inode *raw_inode)
-{
- struct timespec64 ctime = { .tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime) };
-
- if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), i_ctime_extra))
- ext4_decode_extra_time(&ctime, raw_inode->i_ctime_extra);
- inode_set_ctime(inode, ctime.tv_sec, ctime.tv_nsec);
-}
-
#endif /* __KERNEL__ */

#define EFSBADCRC EBADMSG /* Bad CRC detected */
diff --git a/fs/ext4/inode-test.c b/fs/ext4/inode-test.c
index 7935ea6cf92c..f0c0fd507fbc 100644
--- a/fs/ext4/inode-test.c
+++ b/fs/ext4/inode-test.c
@@ -245,9 +245,9 @@ static void inode_test_xtimestamp_decoding(struct kunit *test)
struct timestamp_expectation *test_param =
(struct timestamp_expectation *)(test->param_value);

- timestamp.tv_sec = get_32bit_time(test_param);
- ext4_decode_extra_time(&timestamp,
- cpu_to_le32(test_param->extra_bits));
+ timestamp = ext4_decode_extra_time(
+ cpu_to_le32(get_32bit_time(test_param)),
+ cpu_to_le32(test_param->extra_bits));

KUNIT_EXPECT_EQ_MSG(test,
test_param->expected.tv_sec,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index bbc57954dfd3..c6a837b90af4 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4249,7 +4249,7 @@ static int ext4_fill_raw_inode(struct inode *inode, struct ext4_inode *raw_inode
}
raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);

- ext4_inode_set_ctime(inode, raw_inode);
+ EXT4_INODE_SET_CTIME(inode, raw_inode);
EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode);
EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode);
EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode);
@@ -4858,7 +4858,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
}
}

- ext4_inode_get_ctime(inode, raw_inode);
+ EXT4_INODE_GET_CTIME(inode, raw_inode);
EXT4_INODE_GET_XTIME(i_mtime, inode, raw_inode);
EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode);
EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode);
@@ -4981,7 +4981,7 @@ static void __ext4_update_other_inode_time(struct super_block *sb,
spin_unlock(&inode->i_lock);

spin_lock(&ei->i_raw_lock);
- ext4_inode_get_ctime(inode, raw_inode);
+ EXT4_INODE_SET_CTIME(inode, raw_inode);
EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode);
EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode);
ext4_inode_csum_set(inode, raw_inode, ei);
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 2be40ff8a74f..cdd39b6020f3 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1407,9 +1407,7 @@ static int fat_read_root(struct inode *inode)
MSDOS_I(inode)->mmu_private = inode->i_size;

fat_save_attrs(inode, ATTR_DIR);
- inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode_set_ctime(inode,
- 0, 0).tv_sec;
- inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = 0;
+ inode->i_mtime = inode->i_atime = inode_set_ctime(inode, 0, 0);
set_nlink(inode, fat_subdirs(inode)+2);

return 0;
diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
index 36babb78b510..f4eb8d6f5989 100644
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -15,8 +15,7 @@ static void hpfs_update_directory_times(struct inode *dir)
if (t == dir->i_mtime.tv_sec &&
t == inode_get_ctime(dir).tv_sec)
return;
- dir->i_mtime.tv_sec = inode_set_ctime(dir, t, 0).tv_sec;
- dir->i_mtime.tv_nsec = 0;
+ dir->i_mtime = inode_set_ctime(dir, t, 0);
hpfs_write_inode_nolock(dir);
}

@@ -59,11 +58,8 @@ static int hpfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
result->i_ino = fno;
hpfs_i(result)->i_parent_dir = dir->i_ino;
hpfs_i(result)->i_dno = dno;
- inode_set_ctime(result,
- result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)),
- 0);
- result->i_mtime.tv_nsec = 0;
- result->i_atime.tv_nsec = 0;
+ result->i_mtime = result->i_atime =
+ inode_set_ctime(result, local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)), 0);
hpfs_i(result)->i_ea_size = 0;
result->i_mode |= S_IFDIR;
result->i_op = &hpfs_dir_iops;
@@ -168,11 +164,8 @@ static int hpfs_create(struct mnt_idmap *idmap, struct inode *dir,
result->i_fop = &hpfs_file_ops;
set_nlink(result, 1);
hpfs_i(result)->i_parent_dir = dir->i_ino;
- inode_set_ctime(result,
- result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)),
- 0);
- result->i_mtime.tv_nsec = 0;
- result->i_atime.tv_nsec = 0;
+ result->i_mtime = result->i_atime =
+ inode_set_ctime(result, local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)), 0);
hpfs_i(result)->i_ea_size = 0;
if (dee.read_only)
result->i_mode &= ~0222;
@@ -252,11 +245,8 @@ static int hpfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
hpfs_init_inode(result);
result->i_ino = fno;
hpfs_i(result)->i_parent_dir = dir->i_ino;
- inode_set_ctime(result,
- result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)),
- 0);
- result->i_mtime.tv_nsec = 0;
- result->i_atime.tv_nsec = 0;
+ result->i_mtime = result->i_atime =
+ inode_set_ctime(result, local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)), 0);
hpfs_i(result)->i_ea_size = 0;
result->i_uid = current_fsuid();
result->i_gid = current_fsgid();
@@ -329,11 +319,8 @@ static int hpfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
result->i_ino = fno;
hpfs_init_inode(result);
hpfs_i(result)->i_parent_dir = dir->i_ino;
- inode_set_ctime(result,
- result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)),
- 0);
- result->i_mtime.tv_nsec = 0;
- result->i_atime.tv_nsec = 0;
+ result->i_mtime = result->i_atime =
+ inode_set_ctime(result, local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)), 0);
hpfs_i(result)->i_ea_size = 0;
result->i_mode = S_IFLNK | 0777;
result->i_uid = current_fsuid();
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 98a78200cff1..2ee21286ac8f 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -1422,13 +1422,8 @@ static int isofs_read_inode(struct inode *inode, int relocated)
inode->i_ino, de->flags[-high_sierra]);
}
#endif
-
- inode->i_mtime.tv_sec =
- inode->i_atime.tv_sec = inode_set_ctime(inode,
- iso_date(de->date, high_sierra),
- 0).tv_sec;
- inode->i_mtime.tv_nsec =
- inode->i_atime.tv_nsec = 0;
+ inode->i_mtime = inode->i_atime =
+ inode_set_ctime(inode, iso_date(de->date, high_sierra), 0);

ei->i_first_extent = (isonum_733(de->extent) +
isonum_711(de->ext_attr_length));
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 3715a3940bd4..8a4fc9420b36 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -501,11 +501,7 @@ static struct inode *V1_minix_iget(struct inode *inode)
i_gid_write(inode, raw_inode->i_gid);
set_nlink(inode, raw_inode->i_nlinks);
inode->i_size = raw_inode->i_size;
- inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode_set_ctime(inode,
- raw_inode->i_time,
- 0).tv_sec;
- inode->i_mtime.tv_nsec = 0;
- inode->i_atime.tv_nsec = 0;
+ inode->i_mtime = inode->i_atime = inode_set_ctime(inode, raw_inode->i_time, 0);
inode->i_blocks = 0;
for (i = 0; i < 9; i++)
minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 7acd3e3fe790..7e7876aae01c 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -255,7 +255,7 @@ static void ovl_file_accessed(struct file *file)
if ((!timespec64_equal(&inode->i_mtime, &upperinode->i_mtime) ||
!timespec64_equal(&ctime, &uctime))) {
inode->i_mtime = upperinode->i_mtime;
- inode_set_ctime_to_ts(inode, inode_get_ctime(upperinode));
+ inode_set_ctime_to_ts(inode, uctime);
}

touch_atime(&file->f_path);
diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index 961b9d342e0e..d89739655f9e 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -322,8 +322,7 @@ static struct inode *romfs_iget(struct super_block *sb, unsigned long pos)

set_nlink(i, 1); /* Hard to decide.. */
i->i_size = be32_to_cpu(ri.size);
- i->i_mtime.tv_sec = i->i_atime.tv_sec = inode_set_ctime(i, 0, 0).tv_sec;
- i->i_mtime.tv_nsec = i->i_atime.tv_nsec = 0;
+ i->i_mtime = i->i_atime = inode_set_ctime(i, 0, 0);

/* set up mode and ops */
mode = romfs_modemap[nextfh & ROMFH_TYPE];
diff --git a/fs/smb/client/fscache.h b/fs/smb/client/fscache.h
index a228964bc2ce..84f3b09367d2 100644
--- a/fs/smb/client/fscache.h
+++ b/fs/smb/client/fscache.h
@@ -56,7 +56,7 @@ void cifs_fscache_fill_coherency(struct inode *inode,
cd->last_write_time_sec = cpu_to_le64(cifsi->netfs.inode.i_mtime.tv_sec);
cd->last_write_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_mtime.tv_nsec);
cd->last_change_time_sec = cpu_to_le64(ctime.tv_sec);
- cd->last_change_time_nsec = cpu_to_le64(ctime.tv_nsec);
+ cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec);
}

--
Jeff Layton <jlayton@kernel.org>