Message-ID: <20230705190309.579783-40-jlayton@kernel.org>
Date:   Wed,  5 Jul 2023 15:01:07 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Christian Brauner <brauner@...nel.org>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>
Cc:     Al Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Subject: [PATCH v2 42/92] ext4: convert to ctime accessor functions

In later patches, we're going to change how the inode's ctime field is
used. Switch to using accessor functions instead of raw accesses of
inode->i_ctime.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/ext4/acl.c     |  2 +-
 fs/ext4/ext4.h    | 21 +++++++++++++++++++++
 fs/ext4/extents.c | 12 ++++++------
 fs/ext4/ialloc.c  |  2 +-
 fs/ext4/inline.c  |  4 ++--
 fs/ext4/inode.c   | 16 +++++++---------
 fs/ext4/ioctl.c   |  9 +++++----
 fs/ext4/namei.c   | 26 ++++++++++++--------------
 fs/ext4/super.c   |  2 +-
 fs/ext4/xattr.c   |  6 +++---
 10 files changed, 59 insertions(+), 41 deletions(-)

diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 27fcbddfb148..3bffe862f954 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -259,7 +259,7 @@ ext4_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 	error = __ext4_set_acl(handle, inode, type, acl, 0 /* xattr_flags */);
 	if (!error && update_mode) {
 		inode->i_mode = mode;
-		inode->i_ctime = current_time(inode);
+		inode_set_ctime_current(inode);
 		error = ext4_mark_inode_dirty(handle, inode);
 	}
 out_stop:
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 0a2d55faa095..d502b930431b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3823,6 +3823,27 @@ 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/extents.c b/fs/ext4/extents.c
index e4115d338f10..202c76996b62 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4476,12 +4476,12 @@ static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset,
 		map.m_lblk += ret;
 		map.m_len = len = len - ret;
 		epos = (loff_t)map.m_lblk << inode->i_blkbits;
-		inode->i_ctime = current_time(inode);
+		inode_set_ctime_current(inode);
 		if (new_size) {
 			if (epos > new_size)
 				epos = new_size;
 			if (ext4_update_inode_size(inode, epos) & 0x1)
-				inode->i_mtime = inode->i_ctime;
+				inode->i_mtime = inode_get_ctime(inode);
 		}
 		ret2 = ext4_mark_inode_dirty(handle, inode);
 		ext4_update_inode_fsync_trans(handle, inode, 1);
@@ -4617,7 +4617,7 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 
 		/* Now release the pages and zero block aligned part of pages */
 		truncate_pagecache_range(inode, start, end - 1);
-		inode->i_mtime = inode->i_ctime = current_time(inode);
+		inode->i_mtime = inode_set_ctime_current(inode);
 
 		ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
 					     flags);
@@ -4642,7 +4642,7 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 		goto out_mutex;
 	}
 
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	if (new_size)
 		ext4_update_inode_size(inode, new_size);
 	ret = ext4_mark_inode_dirty(handle, inode);
@@ -5378,7 +5378,7 @@ static int ext4_collapse_range(struct file *file, loff_t offset, loff_t len)
 	up_write(&EXT4_I(inode)->i_data_sem);
 	if (IS_SYNC(inode))
 		ext4_handle_sync(handle);
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	ret = ext4_mark_inode_dirty(handle, inode);
 	ext4_update_inode_fsync_trans(handle, inode, 1);
 
@@ -5488,7 +5488,7 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
 	/* Expand file to avoid data loss if there is error while shifting */
 	inode->i_size += len;
 	EXT4_I(inode)->i_disksize += len;
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	ret = ext4_mark_inode_dirty(handle, inode);
 	if (ret)
 		goto out_stop;
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 754f961cd9fd..48abef5f23e7 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1250,7 +1250,7 @@ struct inode *__ext4_new_inode(struct mnt_idmap *idmap,
 	inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb);
 	/* 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);
+	inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode);
 	ei->i_crtime = inode->i_mtime;
 
 	memset(ei->i_data, 0, sizeof(ei->i_data));
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index a4b7e4bc32d4..003861037374 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1037,7 +1037,7 @@ static int ext4_add_dirent_to_inline(handle_t *handle,
 	 * happen is that the times are slightly out of date
 	 * and/or different from the directory change time.
 	 */
-	dir->i_mtime = dir->i_ctime = current_time(dir);
+	dir->i_mtime = inode_set_ctime_current(dir);
 	ext4_update_dx_flag(dir);
 	inode_inc_iversion(dir);
 	return 1;
@@ -1991,7 +1991,7 @@ int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
 		ext4_orphan_del(handle, inode);
 
 	if (err == 0) {
-		inode->i_mtime = inode->i_ctime = current_time(inode);
+		inode->i_mtime = inode_set_ctime_current(inode);
 		err = ext4_mark_inode_dirty(handle, inode);
 		if (IS_SYNC(inode))
 			ext4_handle_sync(handle);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 3d253e250871..bbc57954dfd3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3986,7 +3986,7 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
 	if (IS_SYNC(inode))
 		ext4_handle_sync(handle);
 
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	ret2 = ext4_mark_inode_dirty(handle, inode);
 	if (unlikely(ret2))
 		ret = ret2;
@@ -4146,7 +4146,7 @@ int ext4_truncate(struct inode *inode)
 	if (inode->i_nlink)
 		ext4_orphan_del(handle, inode);
 
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	err2 = ext4_mark_inode_dirty(handle, inode);
 	if (unlikely(err2 && !err))
 		err = err2;
@@ -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_XTIME(i_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_XTIME(i_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_SET_XTIME(i_ctime, inode, raw_inode);
+		ext4_inode_get_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);
@@ -5376,10 +5376,8 @@ int ext4_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 			 * Update c/mtime on truncate up, ext4_truncate() will
 			 * update c/mtime in shrink case below
 			 */
-			if (!shrink) {
-				inode->i_mtime = current_time(inode);
-				inode->i_ctime = inode->i_mtime;
-			}
+			if (!shrink)
+				inode->i_mtime = inode_set_ctime_current(inode);
 
 			if (shrink)
 				ext4_fc_track_range(handle, inode,
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 331859511f80..b0349f451863 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -449,7 +449,8 @@ static long swap_inode_boot_loader(struct super_block *sb,
 	diff = size - size_bl;
 	swap_inode_data(inode, inode_bl);
 
-	inode->i_ctime = inode_bl->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
+	inode_set_ctime_current(inode_bl);
 	inode_inc_iversion(inode);
 
 	inode->i_generation = get_random_u32();
@@ -663,7 +664,7 @@ static int ext4_ioctl_setflags(struct inode *inode,
 
 	ext4_set_inode_flags(inode, false);
 
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	inode_inc_iversion(inode);
 
 	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
@@ -774,7 +775,7 @@ static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 	}
 
 	EXT4_I(inode)->i_projid = kprojid;
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	inode_inc_iversion(inode);
 out_dirty:
 	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
@@ -1266,7 +1267,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		}
 		err = ext4_reserve_inode_write(handle, inode, &iloc);
 		if (err == 0) {
-			inode->i_ctime = current_time(inode);
+			inode_set_ctime_current(inode);
 			inode_inc_iversion(inode);
 			inode->i_generation = generation;
 			err = ext4_mark_iloc_dirty(handle, inode, &iloc);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 0caf6c730ce3..07f6d96ebc60 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2203,7 +2203,7 @@ static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
 	 * happen is that the times are slightly out of date
 	 * and/or different from the directory change time.
 	 */
-	dir->i_mtime = dir->i_ctime = current_time(dir);
+	dir->i_mtime = inode_set_ctime_current(dir);
 	ext4_update_dx_flag(dir);
 	inode_inc_iversion(dir);
 	err2 = ext4_mark_inode_dirty(handle, dir);
@@ -3197,7 +3197,8 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
 	 * recovery. */
 	inode->i_size = 0;
 	ext4_orphan_add(handle, inode);
-	inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
+	dir->i_mtime = inode_set_ctime_current(dir);
+	inode_set_ctime_current(inode);
 	retval = ext4_mark_inode_dirty(handle, inode);
 	if (retval)
 		goto end_rmdir;
@@ -3271,7 +3272,7 @@ int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
 		retval = ext4_delete_entry(handle, dir, de, bh);
 		if (retval)
 			goto out_handle;
-		dir->i_ctime = dir->i_mtime = current_time(dir);
+		dir->i_mtime = inode_set_ctime_current(dir);
 		ext4_update_dx_flag(dir);
 		retval = ext4_mark_inode_dirty(handle, dir);
 		if (retval)
@@ -3286,7 +3287,7 @@ int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
 		drop_nlink(inode);
 	if (!inode->i_nlink)
 		ext4_orphan_add(handle, inode);
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	retval = ext4_mark_inode_dirty(handle, inode);
 	if (dentry && !retval)
 		ext4_fc_track_unlink(handle, dentry);
@@ -3463,7 +3464,7 @@ int __ext4_link(struct inode *dir, struct inode *inode, struct dentry *dentry)
 	if (IS_DIRSYNC(dir))
 		ext4_handle_sync(handle);
 
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	ext4_inc_count(inode);
 	ihold(inode);
 
@@ -3641,8 +3642,7 @@ static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
 	if (ext4_has_feature_filetype(ent->dir->i_sb))
 		ent->de->file_type = file_type;
 	inode_inc_iversion(ent->dir);
-	ent->dir->i_ctime = ent->dir->i_mtime =
-		current_time(ent->dir);
+	ent->dir->i_mtime = inode_set_ctime_current(ent->dir);
 	retval = ext4_mark_inode_dirty(handle, ent->dir);
 	BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
 	if (!ent->inlined) {
@@ -3941,7 +3941,7 @@ static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	 * Like most other Unix systems, set the ctime for inodes on a
 	 * rename.
 	 */
-	old.inode->i_ctime = current_time(old.inode);
+	inode_set_ctime_current(old.inode);
 	retval = ext4_mark_inode_dirty(handle, old.inode);
 	if (unlikely(retval))
 		goto end_rename;
@@ -3955,9 +3955,9 @@ static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 
 	if (new.inode) {
 		ext4_dec_count(new.inode);
-		new.inode->i_ctime = current_time(new.inode);
+		inode_set_ctime_current(new.inode);
 	}
-	old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir);
+	old.dir->i_mtime = inode_set_ctime_current(old.inode);
 	ext4_update_dx_flag(old.dir);
 	if (old.dir_bh) {
 		retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
@@ -4053,7 +4053,6 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 	};
 	u8 new_file_type;
 	int retval;
-	struct timespec64 ctime;
 
 	if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
 	     !projid_eq(EXT4_I(new_dir)->i_projid,
@@ -4147,9 +4146,8 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 	 * Like most other Unix systems, set the ctime for inodes on a
 	 * rename.
 	 */
-	ctime = current_time(old.inode);
-	old.inode->i_ctime = ctime;
-	new.inode->i_ctime = ctime;
+	inode_set_ctime_current(old.inode);
+	inode_set_ctime_current(new.inode);
 	retval = ext4_mark_inode_dirty(handle, old.inode);
 	if (unlikely(retval))
 		goto end_rename;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c94ebf704616..b54c70e1a74e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -7103,7 +7103,7 @@ static int ext4_quota_off(struct super_block *sb, int type)
 	}
 	EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
 	inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	err = ext4_mark_inode_dirty(handle, inode);
 	ext4_journal_stop(handle);
 out_unlock:
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 321e3a888c20..dbe54cddda3d 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -356,13 +356,13 @@ ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size)
 
 static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode)
 {
-	return ((u64)ea_inode->i_ctime.tv_sec << 32) |
+	return ((u64) inode_get_ctime(ea_inode).tv_sec << 32) |
 		(u32) inode_peek_iversion_raw(ea_inode);
 }
 
 static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count)
 {
-	ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32);
+	inode_set_ctime(ea_inode, (u32)(ref_count >> 32), 0);
 	inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff);
 }
 
@@ -2459,7 +2459,7 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
 	}
 	if (!error) {
 		ext4_xattr_update_super_block(handle, inode->i_sb);
-		inode->i_ctime = current_time(inode);
+		inode_set_ctime_current(inode);
 		inode_inc_iversion(inode);
 		if (!value)
 			no_expand = 0;
-- 
2.41.0

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