linux-kernel - [PATCH 2/2] [v2] hfs/hfsplus: stop using timespec based interfaces

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Message-Id: <20180710214131.4106527-2-arnd@arndb.de>
Date:   Tue, 10 Jul 2018 23:40:51 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     y2038@...ts.linaro.org, Al Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Jeff Layton <jlayton@...hat.com>, Jan Kara <jack@...e.cz>,
        Vyacheslav Dubeyko <slava@...eyko.com>,
        "Ernesto A. Fernandez" <ernesto.mnd.fernandez@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] [v2] hfs/hfsplus: stop using timespec based interfaces

The native HFS and HFS+ timestamps overflow in year 2040, two years after
the Unix y2038 overflow. On 32-bit systems, we currently go through a
conversion that overflows in 2038, while the VFS code is now capable of
representing a 64-bit time range.

This removes the unnecessary conversion, using 64-bit timestamps
consistently

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: reword changelog, combine hfs and hfs+ patches
---
 fs/hfs/hfs_fs.h         |  4 ++--
 fs/hfs/inode.c          |  4 ++--
 fs/hfsplus/hfsplus_fs.h |  4 ++--
 fs/hfsplus/inode.c      | 12 ++++++------
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index 1af998fb522e..45cf1bccc1f2 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -273,9 +273,9 @@ static inline __be32 __hfs_u_to_mtime(time64_t ut)
 #define HFS_I(inode)	(container_of(inode, struct hfs_inode_info, vfs_inode))
 #define HFS_SB(sb)	((struct hfs_sb_info *)(sb)->s_fs_info)
 
-#define hfs_m_to_utime(time)   (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
+#define hfs_m_to_utime(time)   (struct timespec64){ .tv_sec = __hfs_m_to_utime(time) }
 #define hfs_u_to_mtime(time)   __hfs_u_to_mtime((time).tv_sec)
-#define hfs_mtime()		__hfs_u_to_mtime(get_seconds())
+#define hfs_mtime()		__hfs_u_to_mtime(ktime_get_real_seconds())
 
 static inline const char *hfs_mdb_name(struct super_block *sb)
 {
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 2a16111d312f..b3309b83371a 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -351,7 +351,7 @@ static int hfs_read_inode(struct inode *inode, void *data)
 		inode->i_mode &= ~hsb->s_file_umask;
 		inode->i_mode |= S_IFREG;
 		inode->i_ctime = inode->i_atime = inode->i_mtime =
-				timespec_to_timespec64(hfs_m_to_utime(rec->file.MdDat));
+				hfs_m_to_utime(rec->file.MdDat);
 		inode->i_op = &hfs_file_inode_operations;
 		inode->i_fop = &hfs_file_operations;
 		inode->i_mapping->a_ops = &hfs_aops;
@@ -362,7 +362,7 @@ static int hfs_read_inode(struct inode *inode, void *data)
 		HFS_I(inode)->fs_blocks = 0;
 		inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
 		inode->i_ctime = inode->i_atime = inode->i_mtime =
-				timespec_to_timespec64(hfs_m_to_utime(rec->dir.MdDat));
+				hfs_m_to_utime(rec->dir.MdDat);
 		inode->i_op = &hfs_dir_inode_operations;
 		inode->i_fop = &hfs_dir_operations;
 		break;
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 7f0943e540a0..677ef7f9204d 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -555,8 +555,8 @@ static inline __be32 __hfsp_ut2mt(time64_t ut)
 }
 
 /* compatibility */
-#define hfsp_mt2ut(t)		(struct timespec){ .tv_sec = __hfsp_mt2ut(t) }
+#define hfsp_mt2ut(t)		(struct timespec64){ .tv_sec = __hfsp_mt2ut(t) }
 #define hfsp_ut2mt(t)		__hfsp_ut2mt((t).tv_sec)
-#define hfsp_now2mt()		__hfsp_ut2mt(get_seconds())
+#define hfsp_now2mt()		__hfsp_ut2mt(ktime_get_real_seconds())
 
 #endif
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index c824f702feec..c0c8d433864f 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -493,9 +493,9 @@ int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
 		hfsplus_get_perms(inode, &folder->permissions, 1);
 		set_nlink(inode, 1);
 		inode->i_size = 2 + be32_to_cpu(folder->valence);
-		inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(folder->access_date));
-		inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(folder->content_mod_date));
-		inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(folder->attribute_mod_date));
+		inode->i_atime = hfsp_mt2ut(folder->access_date);
+		inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
+		inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
 		HFSPLUS_I(inode)->create_date = folder->create_date;
 		HFSPLUS_I(inode)->fs_blocks = 0;
 		if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
@@ -531,9 +531,9 @@ int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
 			init_special_inode(inode, inode->i_mode,
 					   be32_to_cpu(file->permissions.dev));
 		}
-		inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(file->access_date));
-		inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(file->content_mod_date));
-		inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(file->attribute_mod_date));
+		inode->i_atime = hfsp_mt2ut(file->access_date);
+		inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
+		inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
 		HFSPLUS_I(inode)->create_date = file->create_date;
 	} else {
 		pr_err("bad catalog entry used to create inode\n");
-- 
2.9.0