add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/fuse/file.c
..
..
@@ -206,14 +206,10 @@
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 		fi->attr_version = atomic64_inc_return(&fc->attr_version);
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 		i_size_write(inode, 0);
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 		spin_unlock(&fi->lock);
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-		truncate_pagecache(inode, 0);
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 		fuse_invalidate_attr(inode);
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 		if (fc->writeback_cache)
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 			file_update_time(file);
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-	} else if (!(ff->open_flags & FOPEN_KEEP_CACHE)) {
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-		invalidate_inode_pages2(inode->i_mapping);
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 	}
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-
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 	if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache)
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 		fuse_link_write_file(file);
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 }
..
..
@@ -236,30 +232,39 @@
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 	if (err)
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 		return err;
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-	if (is_wb_truncate || dax_truncate) {
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+	if (is_wb_truncate || dax_truncate)
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 		inode_lock(inode);
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-		fuse_set_nowrite(inode);
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-	}
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 	if (dax_truncate) {
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 		down_write(&get_fuse_inode(inode)->i_mmap_sem);
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 		err = fuse_dax_break_layouts(inode, 0, 0);
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 		if (err)
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-			goto out;
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+			goto out_inode_unlock;
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 	}
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+
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+	if (is_wb_truncate || dax_truncate)
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+		fuse_set_nowrite(inode);
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 	err = fuse_do_open(fm, get_node_id(inode), file, isdir);
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 	if (!err)
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 		fuse_finish_open(inode, file);
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-out:
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+	if (is_wb_truncate || dax_truncate)
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+		fuse_release_nowrite(inode);
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+	if (!err) {
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+		struct fuse_file *ff = file->private_data;
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+
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+		if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC))
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+			truncate_pagecache(inode, 0);
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+		else if (!(ff->open_flags & FOPEN_KEEP_CACHE))
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+			invalidate_inode_pages2(inode->i_mapping);
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+	}
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 	if (dax_truncate)
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 		up_write(&get_fuse_inode(inode)->i_mmap_sem);
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-	if (is_wb_truncate | dax_truncate) {
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-		fuse_release_nowrite(inode);
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+out_inode_unlock:
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+	if (is_wb_truncate || dax_truncate)
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 		inode_unlock(inode);
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-	}
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 	return err;
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 }
..
..
@@ -784,7 +789,7 @@
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 	struct fuse_inode *fi = get_fuse_inode(inode);
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 	spin_lock(&fi->lock);
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-	if (attr_ver == fi->attr_version && size < inode->i_size &&
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+	if (attr_ver >= fi->attr_version && size < inode->i_size &&
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 	    !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
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 		fi->attr_version = atomic64_inc_return(&fc->attr_version);
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 		i_size_write(inode, size);