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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/fs/fat/file.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  linux/fs/fat/file.c
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  *
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@@ -24,9 +25,9 @@
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 {
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 	u32 attr;
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-	inode_lock(inode);
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+	inode_lock_shared(inode);
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 	attr = fat_make_attrs(inode);
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-	inode_unlock(inode);
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+	inode_unlock_shared(inode);
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 	return put_user(attr, user_attr);
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 }
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@@ -171,15 +172,6 @@
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 	}
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 }
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-#ifdef CONFIG_COMPAT
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-static long fat_generic_compat_ioctl(struct file *filp, unsigned int cmd,
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-				      unsigned long arg)
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-
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-{
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-	return fat_generic_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
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-}
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-#endif
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-
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 static int fat_file_release(struct inode *inode, struct file *filp)
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 {
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 	if ((filp->f_mode & FMODE_WRITE) &&
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@@ -203,7 +195,7 @@
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 	if (err)
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 		return err;
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-	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
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+	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
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 }
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@@ -214,11 +206,10 @@
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 	.mmap		= generic_file_mmap,
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 	.release	= fat_file_release,
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 	.unlocked_ioctl	= fat_generic_ioctl,
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-#ifdef CONFIG_COMPAT
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-	.compat_ioctl	= fat_generic_compat_ioctl,
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-#endif
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+	.compat_ioctl	= compat_ptr_ioctl,
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 	.fsync		= fat_file_fsync,
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 	.splice_read	= generic_file_splice_read,
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+	.splice_write	= iter_file_splice_write,
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 	.fallocate	= fat_fallocate,
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 };
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@@ -232,7 +223,7 @@
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 	if (err)
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 		goto out;
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-	inode->i_ctime = inode->i_mtime = current_time(inode);
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+	fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
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 	mark_inode_dirty(inode);
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 	if (IS_SYNC(inode)) {
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 		int err2;
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@@ -335,7 +326,7 @@
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 		MSDOS_I(inode)->i_logstart = 0;
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 	}
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 	MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
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-	inode->i_ctime = inode->i_mtime = current_time(inode);
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+	fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
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 	if (wait) {
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 		err = fat_sync_inode(inode);
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 		if (err) {
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@@ -547,6 +538,18 @@
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 		up_write(&MSDOS_I(inode)->truncate_lock);
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 	}
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+	/*
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+	 * setattr_copy can't truncate these appropriately, so we'll
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+	 * copy them ourselves
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+	 */
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+	if (attr->ia_valid & ATTR_ATIME)
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+		fat_truncate_time(inode, &attr->ia_atime, S_ATIME);
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+	if (attr->ia_valid & ATTR_CTIME)
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+		fat_truncate_time(inode, &attr->ia_ctime, S_CTIME);
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+	if (attr->ia_valid & ATTR_MTIME)
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+		fat_truncate_time(inode, &attr->ia_mtime, S_MTIME);
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+	attr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME);
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+
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 	setattr_copy(inode, attr);
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 	mark_inode_dirty(inode);
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 out:
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@@ -557,4 +560,5 @@
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 const struct inode_operations fat_file_inode_operations = {
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 	.setattr	= fat_setattr,
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 	.getattr	= fat_getattr,
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+	.update_time	= fat_update_time,
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 };